CN115547233A - A pixel driving circuit, its driving method, and a display panel - Google Patents

Abstract

The invention discloses a pixel driving circuit, a driving method thereof, and a display panel. The pixel driving circuit includes: an analog data writing module, a driving module, a storage module, a light emitting module, a digital data writing module, a first reference voltage writing module and a digital signal lighting control module; the analog data writing module is used to write the analog data write drive module; the digital data writing module is used to write digital data into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned on according to the digital data; the first reference voltage writing module is used to write the first reference voltage The voltage is written into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned off according to the first reference voltage. The invention achieves a better effect of gray scale expansion, and can accurately control the closing of the light-emitting module, so that the light-emitting module can better display the brightness to be displayed, and the display effect of the display panel is improved.

Description

A pixel driving circuit, its driving method, and a display panel

technical field

The embodiments of the present invention relate to the field of display technology, and in particular, to a pixel driving circuit, a driving method thereof, and a display panel.

Background technique

With the development of the display technology, the application of the display panel is more and more extensive, and correspondingly, the requirement for the display panel is also higher and higher.

It is difficult for existing display panels to expand all the gray scales, and the brightness of gray scales is prone to sudden changes, which affects the display effect of the display panel, and it is difficult to accurately control the shutdown of the light emitting module when the pixel driving circuit uses digital and analog hybrid driving.

Contents of the invention

The present invention provides a pixel driving circuit, its driving method, and a display panel, so as to realize better grayscale expansion, improve the display effect of the display panel, and realize accurate control of the light-emitting module when the pixel driving circuit uses digital and analog hybrid driving off.

In the first aspect, an embodiment of the present invention provides a pixel driving circuit, which includes: an analog data writing module, a driving module, a storage module, a light emitting module, a digital data writing module, and a first reference voltage writing module and digital signal lighting control module;

The analog data writing module is used to write analog data into the driving module, the driving module is used to generate a driving current, the light emitting module is used to respond to the driving current, and the storage module is used to maintain the The potential of the control terminal of the drive module;

The digital data writing module is used to write digital data into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned on according to the digital data;

The first reference voltage writing module is used to write a first reference voltage into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned off according to the first reference voltage.

Optionally, the digital data writing module includes a first transistor, and the first reference voltage writing module includes a second transistor;

The control end of the first transistor is connected to the first scan signal, the first end of the first transistor is used to write the digital data, the second end of the first transistor is connected to the digital signal light emitting control module The control terminal is electrically connected;

The control terminal of the second transistor is connected to the first control signal, the first terminal of the second transistor is used to write the first reference voltage, and the second terminal of the second transistor is connected to the digital signal to emit light The control terminal of the control module is electrically connected.

Optionally, the digital data writing module further includes a third transistor, and the first reference voltage writing module further includes a fourth transistor;

The control end of the third transistor is used to access the second scan signal, the first end of the third transistor is electrically connected to the first end of the first transistor, and the second end of the third transistor is electrically connected to the first end of the third transistor. The second terminal of the first transistor is electrically connected; the phase of the first scanning signal is opposite to that of the second scanning signal, the first transistor is an N-type transistor, and the third transistor is a P-type transistor;

The control terminal of the fourth transistor is connected to the second control signal, the first terminal of the fourth transistor is electrically connected to the first terminal of the second transistor, and the second terminal of the fourth transistor is connected to the first terminal of the first transistor. The second terminals of the two transistors are electrically connected; the phase of the first control signal is opposite to that of the second control signal, the second transistor is a P-type transistor, and the fourth transistor is an N-type transistor.

Optionally, the pixel driving circuit also includes a latch module;

The latch module is used to maintain the potential of the control terminal of the digital signal lighting control module.

Optionally, the latch module includes a first inverter and a second inverter, the input end of the first inverter is electrically connected to the control end of the digital signal lighting control module, and the first inverter The output end of the inverter is electrically connected to the input end of the second inverter, and the output end of the second inverter is electrically connected to the second end of the first transistor;

Alternatively, the latch module includes a first capacitor, the first end of the first capacitor is connected to the first power supply signal, and the second end of the first capacitor is electrically connected to the control end of the digital signal lighting control module .

Optionally, the control end of the analog data writing module is connected to the third scan signal, the first end of the analog data writing module is used to write analog data, and the second end of the analog data writing module electrically connected to the control terminal of the drive module;

The first end of the driving module is used to connect the first power signal, the second end of the driving module is electrically connected to the first end of the digital signal lighting control module, and the second end of the digital signal lighting control module It is electrically connected to the first end of the light emitting module, and the second end of the light emitting module is connected to the second power signal;

The first terminal of the storage module is connected to the first power signal, and the second terminal of the storage module is electrically connected to the control terminal of the drive module;

The first end of the digital data writing module is connected to digital data, and the second end of the digital data writing module is electrically connected to the control end of the digital signal lighting control module;

The first terminal of the first reference voltage writing module is connected to the first reference voltage, and the second terminal of the first reference voltage writing module is electrically connected to the control terminal of the digital signal lighting control module.

Optionally, the pixel driving circuit further includes a first initialization module, a second initialization module, a threshold compensation module, a first analog signal light emission control module, and a second analog signal light emission control module;

The control terminal of the first initialization module is connected to the fourth scanning signal, the first terminal of the first initialization module is connected to the second reference voltage, and the second terminal of the first initialization module is electrically connected to the control terminal of the driving module. connected, the first end of the storage module is electrically connected to the control end of the drive module, and the second end of the storage module is connected to a first power signal; the first initialization module is used to initialize the drive module;

The control terminal of the second initialization module is connected to the fourth scan signal, the first terminal of the second initialization module is connected to the second reference voltage, the second terminal of the second initialization module is connected to the The first end of the light emitting module is electrically connected; the second initialization module is used to initialize the light emitting module;

The control end of the analog data writing module is connected to the third scan signal, the first end of the analog data writing module is used to write analog data, the second end of the analog data writing module is connected to the drive the first end of the module is electrically connected;

The first end of the driving module is electrically connected to the first end of the first analog signal lighting control module, and the second end of the driving module is electrically connected to the first end of the second analog signal lighting control module;

The control terminal of the first analog signal lighting control module is connected to the enabling signal, and the second terminal of the first analog signal lighting control module is electrically connected to the first power supply signal;

The control terminal of the threshold compensation module is connected to the third scan signal, the first terminal of the threshold compensation module is electrically connected to the control terminal of the driving module, and the second terminal of the threshold compensation module is connected to the second terminal of the threshold compensation module. The first terminals of the two analog signal lighting control modules are electrically connected; the threshold compensation module is used to capture the threshold voltage of the driving module to the control terminal of the driving module;

The control terminal of the second analog signal lighting control module is connected to the enabling signal, and the second terminal of the second analog signal lighting control module is electrically connected to the digital signal lighting control module.

In the second aspect, an embodiment of the present invention further provides a driving method of a pixel driving circuit, which is used to drive any of the pixel driving circuits described in the first aspect, and the driving method of the pixel driving circuit includes:

Obtain the brightness to be displayed;

judging whether the brightness to be displayed satisfies a preset condition;

If the brightness to be displayed satisfies the preset condition, then determine the analog data according to the brightness to be displayed; write the analog data into the drive module in the data writing phase, and write the digital data in the light emitting phase Continuously write the digital signal to the lighting control module;

If the brightness to be displayed does not meet the preset condition, then determine the first conduction time of the digital data writing module and the second conduction time of the first reference voltage writing module according to the brightness to be displayed; In the data writing stage, the analog data is written into the driving module, and the digital data is written into the control terminal of the digital lighting control module during the first conduction time, and the first The reference voltage is written into the control terminal of the digital lighting control module, wherein the analog data is a fixed value.

Optionally, the preset conditions include:

The brightness to be displayed is greater than the preset brightness, or the binary data corresponding to the brightness to be displayed is opposite to the corresponding binary data of the current display brightness.

In a third aspect, an embodiment of the present invention further provides a display panel, which is characterized in that it includes any pixel driving circuit described in the first aspect.

The pixel driving circuit used in the present invention includes an analog data writing module, a driving module, a storage module, a light emitting module, a digital data writing module, a first reference voltage writing module and a digital signal lighting control module. If the brightness to be displayed meets the preset Conditions, then determine the analog data according to the brightness to be displayed, write the analog data into the drive module, so that the light-emitting module emits light according to the analog data, and realize the brightness to be displayed; if the brightness to be displayed does not meet the preset conditions, then determine the digital data according to the brightness to be displayed Write the first conduction time of the module and the first reference voltage into the second conduction time of the module, use the first conduction time and the second conduction time to control the light-emitting duration of the light-emitting module, and realize the brightness to be displayed. By using the mixed driving of analog data and digital data, the light-emitting module can realize different brightness to be displayed, that is, realize different display gray scales, so as to realize the complete expansion of the display gray scales. Moreover, the use of analog data driving can avoid the gray scale jump problem caused by digital data driving, thereby improving the display effect of the display panel and improving the uniformity of display brightness of the display panel. The present invention solves the problem that the display gray scale of the display panel is difficult to fully expand and the display gray scale is easy to jump, achieves a better effect of gray scale expansion, and can accurately control the closing of the light-emitting module, so that the light-emitting module can display better The brightness to be displayed improves the display effect of the display panel.

Description of drawings

FIG. 1 is a schematic circuit structure diagram of a pixel driving circuit provided by an embodiment of the present invention;

FIG. 2 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 3 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 4 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 5 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 6 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 7 is a timing diagram of a pixel driving circuit provided by an embodiment of the present invention;

FIG. 8 is a timing diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 9 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

FIG. 10 is a flowchart of a driving method of a pixel driving circuit provided by an embodiment of the present invention;

Fig. 11 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a display device provided by an embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

As mentioned in the background technology, the existing display panel has the problem that it is difficult to expand all the gray scales, so that the brightness of the gray scale is prone to sudden changes, which affects the display effect of the display panel. After careful research, the applicant found that the technical problem occurred The reason is that the pixel driving circuit of the existing display panel is only driven by digital data or only by analog data, and the digital data itself is discrete, which is easy to cause a sudden change in the gray scale of the display; the expansion range of the voltage and current generated by the analog data is limited. , making it difficult to expand all display gray scales, which affects the display effect of the display panel; moreover, in the existing pixel driving circuit using digital and analog hybrid driving, the current of the light-emitting module is changed by changing the analog data, thereby forcibly turning off the light-emitting module, which is not conducive to the complete shutdown of the light-emitting module, which may cause residual brightness in the light-emitting module, making it difficult to accurately control the shutdown of the light-emitting module.

For above-mentioned technical problem, the present invention proposes following solution:

Fig. 1 is a schematic circuit structure diagram of a pixel driving circuit provided by an embodiment of the present invention. Referring to Fig. 1, the pixel driving circuit includes: an analog data writing module 101, a driving module 102, a storage module 103, a light emitting module 104, a digital data writing module input module 105, the first reference voltage writing module 106 and digital signal lighting control module 107; the analog data writing module 101 is used to write analog data into the driving module 102, and the driving module 102 is used to generate a driving current, and the lighting module 104 is used In response to the drive current, the storage module 103 is used to maintain the potential of the control terminal of the drive module 102; the digital data writing module 105 is used to write digital data into the control terminal of the digital signal lighting control module 107, and the digital signal lighting control module 107 according to the digital signal Data on; the first reference voltage writing module 106 is used to write the first reference voltage into the control terminal of the digital signal lighting control module 107, and the digital signal lighting control module 107 is turned off according to the first reference voltage.

Specifically, the light-emitting module 104 can be, for example, an OLED (Organic Light-Emitting Diode, organic light-emitting diode), and the OLED is a current-type device that can emit light only under the action of a driving current. The driving module 102 can write the analog data into the module 101 The written analog data generates a corresponding driving current, and the light emitting module 104 emits light according to the driving current, thereby realizing the function of analog driving. The digital data writing module 105 writes digital data into the control terminal of the digital signal lighting control module 107, thereby turning on the digital signal lighting control module 107. Therefore, controlling the turn-on time of the digital data writing module 105 can control the digital signal The turn-on time of the light emitting control module 107 is used to control the light emitting time of the light emitting module 104 to realize the function of digital driving. The first reference voltage writing module 106 writes the first reference voltage into the control terminal of the digital signal lighting control module 107, thereby turning off the digital signal lighting control module 107, therefore, controlling the conduction time of the first reference voltage writing module 106 That is, the off time of the digital signal light emitting control module 107 can be controlled, so as to control the light emitting time of the light emitting module 104 .

When displaying the brightness to be displayed, the pixel driving circuit of this embodiment first judges whether the brightness to be displayed satisfies the preset condition. , the analog drive is adopted. In the analog drive mode, when the display brightness is different, the analog data is different; in the data writing stage, the determined analog data is written into the drive module 102; in the light emitting stage, the digital data is written into the module 105 is turned on, the digital data is continuously written into the digital signal lighting control module 107, and the lighting module 104 continues to emit light according to the analog data, so that the lighting module 104 can display according to the brightness to be displayed. If the brightness to be displayed does not meet the preset condition, then determine the first conduction time of the digital data writing module 105 and the second conduction time of the first reference voltage writing module 106 according to the brightness to be displayed, that is, if the preset condition is not met, If the conditions are set, the digital driving method is adopted. In the data writing stage, the analog data is written into the driving module 102; The module 104 emits light, and at the second conduction time, the first reference voltage is continuously written into the digital signal light emission control module 107, and the light emitting module 104 is turned off, so that the light emitting module 104 emits light according to the determined first conduction time, and according to the second conduction time The on time is turned off, so that the light emitting module 104 can be displayed according to the brightness to be displayed. When the preset conditions are met, the analog data is used to control the current of the light emitting module 104 to achieve the brightness to be displayed; Different brightness to be displayed. Therefore, the mixed driving of analog data and digital data can make the light emitting module 104 realize different brightness to be displayed, that is, realize different display gray scales, so as to realize the complete expansion of display gray scales. Moreover, the use of analog data driving can avoid the gray scale jump problem caused by digital data driving, thereby improving the display effect of the display panel and improving the uniformity of display brightness of the display panel.

Wherein, in the digital driving mode, the analog data is a fixed value, and only when the brightness to be displayed meets a preset condition, that is, only in the analog driving mode, the analog data will be changed according to the brightness to be displayed.

Among them, the preset condition can be, for example, a display grayscale jump, which means that each bit of the binary data corresponding to the brightness to be displayed is opposite to the binary data corresponding to the current display brightness; the preset condition can also be that the binary data to be displayed The brightness greater than the preset brightness may also be other conditions, which may be determined according to actual conditions, and are not limited in this embodiment.

In addition, in this embodiment, the first reference voltage writing module 106 is used to control the closing of the digital signal light emitting control module 107, so as to control the closing of the light emitting module 104. Since the digital signal light emitting control module 107 is closed, there is no current in the light emitting module 104 at all. Therefore, the light-emitting module 104 can be completely turned off without residual brightness, so that the light-emitting module 104 can be accurately controlled to turn off. Moreover, the technical solution of this embodiment is more convenient than changing the analog data in the prior art to forcibly turn off the lighting module 104, and by controlling the conduction time of the first reference voltage writing module 106, the digital signal lighting control module can be controlled 107, so that the off time of the light emitting module 104 can be controlled, so as to realize the brightness to be displayed more accurately. Usually, the voltage of the digital data does not change, so the digital signal lighting control module 107 cannot be turned off by the voltage of the digital data. Moreover, if only the digital data writing module 105 can be set, and the digital signal lighting control module 107 can be turned on and off by changing the digital data, then the digital data writing module 105 will always be turned on, and the digital data can be written in through the control. However, it is difficult to accurately control the writing time of digital data, and the change of digital data may cause the jump of gray scale, which is not conducive to the complete development of gray scale. Therefore, in the technical solution of this embodiment, by setting the digital data writing module 105 and the first reference voltage writing module 106, by controlling the first conduction time of the digital data writing module 105 and the first reference voltage writing module 106 The second turn-on time can more accurately control the turn-on time and turn-off time of the digital signal lighting control module 107, so as to realize the brightness to be displayed more accurately, and thus facilitate the full development of the gray scale. Moreover, the digital data writing module 105 and the first reference voltage writing module 106 can start working asynchronously, and can be in different sub-frames at the same time, so as to realize more brightness to be displayed, thereby facilitating the complete development of the gray scale.

In the technical solution of this embodiment, the pixel driving circuit used includes an analog data writing module, a driving module, a storage module, a light emitting module, a digital data writing module, a first reference voltage writing module and a digital signal lighting control module. If the display brightness meets the preset conditions, the analog data is determined according to the brightness to be displayed, and the analog data is written into the drive module, so that the light-emitting module emits light according to the analog data to realize the brightness to be displayed; if the brightness to be displayed does not meet the preset conditions, then according to the The display brightness determines the first conduction time of the digital data writing module and the second conduction time of the first reference voltage writing module, and uses the first conduction time and the second conduction time to control the light-emitting duration of the light-emitting module to realize the standby time. Display brightness. By using the mixed driving of analog data and digital data, the light-emitting module can realize different brightness to be displayed, that is, realize different display gray scales, so as to realize the complete expansion of the display gray scales. Moreover, the use of analog data driving can avoid the gray scale jump problem caused by digital data driving, thereby improving the display effect of the display panel and improving the uniformity of display brightness of the display panel. The technical solution of this embodiment solves the problem that the display gray scale of the display panel is difficult to fully expand and the display gray scale is easy to jump, achieves a better effect of gray scale expansion, and can accurately control the closing of the light-emitting module, so that the light-emitting module The brightness to be displayed is better displayed, and the display effect of the display panel is improved.

On the basis of the above-mentioned embodiments, FIG. 2 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to FIG. 2 , the digital data writing module 105 includes a first transistor T1, a first The reference voltage writing module 106 includes a second transistor T2; the control terminal of the first transistor T1 is connected to the first scanning signal Scan1, the first terminal of the first transistor T1 is used for writing digital data Data1, and the second terminal of the first transistor T1 terminal is electrically connected to the control terminal of the digital signal lighting control module 107; the control terminal of the second transistor T2 is connected to the first control signal Clear1, the first terminal of the second transistor T2 is used to write the first reference voltage Vref1, and the second transistor T2 The second end of T2 is electrically connected to the control end of the digital signal lighting control module 107 .

Specifically, the first scan signal Scan1 can control the turn-on and turn-off of the first transistor T1, and the turn-on time of the first transistor T1 can be controlled by using the first scan signal Scan1, thereby controlling the turn-on time of the digital signal light emitting control module 107 . The first transistor T1 can be an N-type transistor or a P-type transistor, because the N-type transistor is more effective in transmitting low level, and the P-type transistor is more effective in transmitting high level, so when the digital data Data1 written in the first transistor T1 When the level is high, the first transistor T1 is a P-type transistor. When the digital data Data1 is at a low level, the first transistor T1 is an N-type transistor. Only the case where the first transistor T1 is an N-type transistor is shown in FIG. 2 . But not limited. The first control signal Clear1 can control the turn-on and turn-off of the second transistor T2 , and the turn-on time of the second transistor T2 can be controlled by the first control signal Clear1 , thereby controlling the turn-off time of the digital signal lighting control module 107 . Similarly, the second transistor T2 may be an N-type transistor or a P-type transistor. FIG. 2 only shows the case where the second transistor T2 is a P-type transistor, but not limited thereto.

On the basis of the above embodiments, FIG. 3 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to FIG. 3 , the digital data writing module 105 also includes a third transistor T3, the first A reference voltage writing module 106 also includes a fourth transistor T4; the control terminal of the third transistor T3 is used to access the second scanning signal Scan2, and the first terminal of the third transistor T3 is electrically connected to the first terminal of the first transistor T1 , the second end of the third transistor T3 is electrically connected to the second end of the first transistor T1; the phase of the first scanning signal Scan1 and the second scanning signal Scan2 are opposite, the first transistor T1 is an N-type transistor, and the third transistor T3 is a P type transistor; the control end of the fourth transistor T4 is connected to the second control signal Clear2, the first end of the fourth transistor T4 is electrically connected to the first end of the second transistor T2, and the second end of the fourth transistor T4 is connected to the second transistor T4 The second end of T2 is electrically connected; the phase of the first control signal Clear1 and the second control signal Clear2 are opposite, the second transistor T2 is a P-type transistor, and the fourth transistor T4 is an N-type transistor.

Specifically, setting the first transistor T1 as an N-type transistor and the third transistor T3 as a P-type transistor can make it possible to effectively transmit the digital data Data1 regardless of whether it is at a low level or at a high level, thereby improving the driving performance of the pixel driving circuit. In addition, the first scan signal Scan1 and the second scan signal Scan2 have opposite phases, which can ensure that the first transistor T1 and the third transistor T3 are turned on at the same time, and ensure that the digital data Data1 can be written into the digital signal light emission control module 107 . Setting the third transistor T3 as a P-type transistor and the fourth transistor T4 as an N-type transistor can enable effective transmission regardless of whether the first reference voltage Vref1 is at a low level or at a high level, thereby improving the driving efficiency of the pixel driving circuit , and the phase of the first control signal Clear1 is opposite to that of the second control signal Clear2, which can ensure that the second transistor T2 and the fourth transistor T4 are turned on at the same time, and ensure that the first reference voltage Vref1 can be written into the digital signal lighting control module 107 .

Optionally, continuing to refer to FIG. 2 , the pixel driving circuit further includes a latch module 108 ; the latch module 108 is used to maintain the potential of the control terminal of the digital signal light emission control module 107 .

Specifically, the latch module 108 has the function of temporarily storing data, and can maintain the potential of the control terminal of the digital signal lighting control module 107, so that the potential of the control terminal of the digital signal lighting control module 107 will not be affected by the environment. When the digital data written by the module 105 changes, the potential of the control terminal of the digital signal lighting control module 107 will change accordingly, which ensures the accuracy of digital data writing.

Optionally, continuing to refer to FIG. 2, the latch module 108 includes a first inverter 108a and a second inverter 108b, the input terminal of the first inverter 108a is electrically connected to the control terminal of the digital signal lighting control module 107, The output terminal of the first inverter 108a is electrically connected to the input terminal of the second inverter 108b, and the output terminal of the second inverter 108b is electrically connected to the second terminal of the first transistor T1.

Alternatively, FIG. 4 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to FIG. 4 , the latch module 108 includes a first capacitor C1, and the first terminal of the first capacitor C1 is connected to For the first power signal, the second end of the first capacitor C1 is electrically connected to the control end of the digital signal lighting control module 107 .

Specifically, the latch module 108 may include a first inverter 108a and a second inverter 108b, which can realize signal latching and isolation, and ensure that the potential of the control terminal of the digital signal lighting control module 107 will not be affected by the environment, thereby Maintaining the potential of the control terminal of the digital signal lighting control module 107 ensures the accuracy of digital data writing. In addition, the first inverter 108a and the second inverter 108b also have the function of data shaping.

Alternatively, the latch module 108 may include a first capacitor C1, the first capacitor C1 has the function of storing energy, so as to maintain the potential of the control terminal of the digital signal lighting control module 107, and the cost of the capacitor is low, which can reduce the cost of the pixel driving circuit.

Optionally, continuing to refer to FIG. 1 , the control terminal of the analog data writing module 101 is connected to the third scanning signal Scan3, and the first end of the analog data writing module 101 is used to write the analog data Data2, and the analog data writing module 101 The second end of the drive module 102 is electrically connected to the control end; the first end of the drive module 102 is used to connect the first power supply signal, and the second end of the drive module 102 is electrically connected to the first end of the digital signal lighting control module 107, The second end of the digital signal lighting control module 107 is electrically connected to the first end of the light emitting module 104, and the second end of the light emitting module 104 is connected to the second power signal; the first end of the storage module 103 is connected to the first power signal, and the storage module 103 The second end of the digital data writing module 105 is electrically connected to the control end of the drive module 102; the first end of the digital data writing module 105 is connected to the digital data Data1, and the second end of the digital data writing module 105 is connected to the control end of the digital signal lighting control module 107 Electrical connection: the first terminal of the first reference voltage writing module 106 is connected to the first reference voltage Vref1 , and the second terminal of the first reference voltage writing module 106 is electrically connected to the control terminal of the digital signal lighting control module 107 .

Specifically, the analog data writing module 101 can be controlled to be turned on and off through the third scanning signal Scan3, and when the analog data writing module 101 is turned on, the analog data Data2 can be written into the driving module 102, and the driving module 102 generates corresponding For driving current, when the digital data writing module 105 is turned on, the digital data Data1 is written into the digital signal light emitting control module 107, so that the digital signal light emitting control module 107 is turned on, and the light emitting module 104 can emit light according to the driving current. When the first reference voltage writing module 106 is turned on, it writes the first reference voltage Vref1 into the digital signal lighting control module 107, so that the digital signal lighting control module 107 is turned off, and the lighting module 104 cannot obtain the driving current and is turned off. Therefore, by controlling the first conduction time of the digital data writing module 105 and the second conduction time of the first reference voltage writing module 106, the conduction time and the cut-off time of the digital signal lighting control module 107 can be controlled, thereby The light-emitting duration of the light-emitting module 104 is controlled.

On the basis of the above technical solution, FIG. 5 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to FIG. 5 , the analog data writing module 101 includes a fifth transistor T5, and the driving module 102 includes a sixth transistor T6, the storage module 103 includes a second capacitor C2, and the light emitting module 104 includes an organic light emitting diode D1. The control terminal of the fifth transistor T5 is the control terminal of the analog data writing module 101, the first terminal of the fifth transistor T5 is the first terminal of the analog data writing module 101, and the second terminal of the fifth transistor T5 is the analog data writing module 101. into the second end of the module 101. The control terminal of the sixth transistor T6 is the control terminal of the driving module 102 , the first terminal of the sixth transistor T6 is the first terminal of the driving module 102 , and the second terminal of the sixth transistor T6 is the second terminal of the driving module 102 . The first terminal of the second capacitor C2 is the first terminal of the storage module 103 , and the second terminal of the second capacitor C2 is the second terminal of the storage module 103 . The anode of the OLED D1 is the first end of the light emitting module 104 , and the cathode of the OLED D1 is the second end of the light emitting module 104 . The first power signal is a voltage VDD, and the second power signal is a voltage VSS. The digital signal lighting control module 107 includes a seventh transistor T7, the control terminal of the seventh transistor T7 is the control terminal of the digital signal lighting control module 107, the first terminal of the seventh transistor T7 is the first terminal of the digital signal lighting control module 107, The second terminal of the seventh transistor T7 is the second terminal of the digital signal lighting control module 107 . FIG. 5 only shows that the digital data writing module 105 includes a first transistor T1 and a third transistor T3, and the first reference voltage writing module 106 includes a second transistor T2 and a fourth transistor T4, but it is not limited thereto. .

Fig. 6 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to Fig. 6, the pixel driving circuit further includes a first initialization module 109, a second initialization module 110, a threshold compensation module 111, The first analog signal lighting control module 112 and the second analog signal lighting control module 113; the control terminal of the first initialization module 109 is connected to the fourth scanning signal Scan4, and the first terminal of the first initialization module 109 is connected to the second reference voltage Vref2 , the second end of the first initialization module 109 is electrically connected to the control end of the drive module 102, the first end of the storage module 103 is electrically connected to the control end of the drive module 102, and the second end of the storage module 103 is connected to the first power supply signal; The first initialization module 109 is used to initialize the drive module 102; the control terminal of the second initialization module 110 is connected to the fourth scan signal Scan4, the first terminal of the second initialization module 110 is connected to the second reference voltage Vref2, and the second initialization module 110 The second end of the second end is electrically connected to the first end of the light-emitting module 104; the second initialization module 110 is used to initialize the light-emitting module 104; the control end of the analog data writing module 101 is connected to the third scanning signal Scan3, and the analog data writing module 101 The first end of the first end is used to write the analog data Data2, the second end of the analog data writing module 101 is electrically connected to the first end of the driving module 102; the first end of the driving module 102 is connected to the first analog signal light emitting control module 112 The first end is electrically connected, and the second end of the driving module 102 is electrically connected to the first end of the second analog signal light emitting control module 113; the control end of the first analog signal light emitting control module 112 is connected to the enable signal EM, and the first analog signal The second end of the signal lighting control module 112 is electrically connected to the first power supply signal; the control end of the threshold compensation module 111 is connected to the third scan signal Scan3, and the first end of the threshold compensation module 111 is electrically connected to the control end of the drive module 102, The second end of the threshold compensation module 111 is electrically connected to the first end of the second analog signal lighting control module 113; the threshold compensation module 111 is used to capture the threshold voltage of the driving module 102 to the control end of the driving module 102; the second analog signal The control terminal of the lighting control module 113 is connected to the enable signal EM, and the second terminal of the second analog signal lighting control module 113 is electrically connected to the digital signal lighting control module 107 .

Specifically, FIG. 7 is a timing diagram of a pixel driving circuit provided by an embodiment of the present invention. Referring to FIG. 7, in the initialization phase t1, the fourth scan signal Scan4 is at a low level, and the fourth scan signal Scan4 controls the first initialization module 109 and the second initialization module 110 are turned on, so that the second reference voltage Vref2 is written into the first initialization module 109 and the second initialization module 110 , thereby initializing the driving module 102 and the light emitting module 104 . In the analog data writing and threshold compensation phase t2, the third scanning signal Scan3 is at a low level, and the third scanning signal Scan3 controls the analog data writing module 101 to be turned on, so that the analog data Data2 is written and driven by the analog data writing module 101 The module 102 , while the threshold compensation module 111 is turned on, performs threshold compensation, so that the magnitude of the current flowing through the light emitting module 104 has nothing to do with the threshold voltage of the driving module 102 . In the light-emitting phase t3, the enable signal EM is at a low level, thereby controlling the first analog signal light-emitting control module 112 and the second analog signal light-emitting control module 113 to be turned on, and the first scan signal Scan1 controls the digital data writing module 105 to be turned on. is turned on, so that the digital data Data1 is written into the digital signal light emitting control module 107, so that the digital signal light emitting control module 107 is also turned on, so that the light emitting module 104 is turned on, and the light emitting module 104 emits light. Fig. 8 is a timing diagram of another pixel driving circuit provided by an embodiment of the present invention. Refer to Fig. 8. In Fig. 8, the abscissa represents time, and the ordinate represents the number of pixel rows. Fig. 8 only shows the However, it is not limited. The solid line in FIG. 8 represents the first scanning signal Scan1, the dotted line represents the first control signal Clear1, and SF1, SF2, SF3 and SF4 represent scanning time periods corresponding to different brightnesses to be displayed. Therefore, in In the lighting stage, the scanning time of the first scanning signal Scan1 and the scanning time of the first control signal Clear1 can be determined according to the brightness to be displayed, so as to control the first conduction time of the digital data writing module 105 and the first reference voltage writing module 106 to control the on-time and off-time of the digital signal lighting control module 107, so as to control the light-emitting module 104 to emit light according to the brightness to be displayed, thereby realizing different display gray scales. However, when the current display brightness and the brightness to be displayed are relatively large, it may not be easy to control the light-emitting module 104 to display the brightness to be displayed by controlling the on-time and cut-off time of the digital signal light-emitting control module 107. At this time, it can be adjusted according to the brightness to be displayed. The data Data2 is simulated to control the current of the light emitting module 104 so that the light emitting module 104 displays the brightness to be displayed. Moreover, the scan time of the first scan signal Scan1 is binary data. When the bits of the binary data corresponding to the brightness to be displayed are opposite to the bits of the binary data corresponding to the current display brightness, the display gray scale of the light emitting module 104 is likely to jump. , the analog data Data2 can be adjusted according to the brightness to be displayed, so as to control the current of the light emitting module 104, so that the light emitting module 104 can display the brightness to be displayed. Therefore, through the mixed driving of digital data and analog data, better display gray scales can be achieved, different display gray scales can be better realized, and the problem of gray scale jumps caused by digital data driving can also be avoided, achieving improved The display effect of the display panel improves the uniformity of the display brightness of the display panel.

FIG. 9 is a schematic circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to FIG. 9, the first initialization module 109 includes an eighth transistor T8, and the control terminal of the eighth transistor T8 is the first initialization The control terminal of the module 109 , the first terminal of the eighth transistor T8 is the first terminal of the first initialization module 109 , and the second terminal of the eighth transistor T8 is the second terminal of the first initialization module 109 . The second initialization module 110 includes a ninth transistor T9, the control terminal of the ninth transistor T9 is the control terminal of the second initialization module 110, the first terminal of the ninth transistor T9 is the first terminal of the second initialization module 110, and the ninth transistor T9 The second end of T9 is the second end of the second initialization module 110 . The threshold compensation module 111 includes a tenth transistor T10, the control terminal of the tenth transistor T10 is the control terminal of the threshold compensation module 111, the first terminal of the tenth transistor T10 is the first terminal of the threshold compensation module 111, and the first terminal of the tenth transistor T10 is The two ends are the second end of the threshold compensation module 111 . The first analog signal lighting control module 112 includes an eleventh transistor T11, the control terminal of the eleventh transistor T11 is the control terminal of the first analog signal lighting control module 112, and the first terminal of the eleventh transistor T11 is the first analog signal The first terminal of the lighting control module 112 and the second terminal of the eleventh transistor T11 are the second terminal of the first analog signal lighting control module 112 . The second analog signal lighting control module 113 includes a twelfth transistor T12, the control terminal of the twelfth transistor T12 is the control terminal of the second analog signal lighting control module 113, and the first terminal of the twelfth transistor T12 is the second analog signal The first terminal of the lighting control module 113 and the second terminal of the twelfth transistor T12 are the second terminal of the second analog signal lighting control module 113 .

This embodiment also provides a driving method for a pixel driving circuit, which is used to drive the pixel driving circuit described in any of the above technical solutions. FIG. 10 is a flowchart of a driving method for a pixel driving circuit provided in an embodiment of the present invention. Referring to Figure 10, the driving method of the pixel driving circuit includes:

S101. Obtain brightness to be displayed.

S102. Determine whether the brightness to be displayed satisfies a preset condition; if yes, execute S103; if not, execute S104.

S103. Determine the analog data according to the brightness to be displayed; write the analog data into the drive module during the data writing phase, and continuously write the digital data into the digital signal light emitting control module during the light emitting phase.

S104. Determine the first conduction time of the digital data writing module and the second conduction time of the first reference voltage writing module according to the brightness to be displayed; write the analog data into the drive module in the data writing phase, and The digital data is written into the control terminal of the digital light emitting control module during the conduction time, and the first reference voltage is written into the control terminal of the digital light emitting control module during the second conduction time, wherein the analog data is a fixed value.

For the specific working process of the driving method in this embodiment, reference may be made to the description of the pixel driving circuit in the embodiment of the present invention, which will not be repeated here. By using the mixed driving of analog data and digital data, the light-emitting module can realize different brightness to be displayed, that is, realize different display gray scales, so as to realize the complete expansion of the display gray scales. Moreover, the use of analog data driving can avoid the gray scale jump problem caused by digital data driving, thereby improving the display effect of the display panel and improving the uniformity of display brightness of the display panel.

Optionally, the preset condition includes: the brightness to be displayed is greater than the preset brightness, or each bit of the binary data corresponding to the brightness to be displayed is opposite to that of the binary data corresponding to the current display brightness.

Fig. 11 is a schematic structural diagram of a display panel provided by an embodiment of the present invention. Referring to Fig. 11, the display panel includes a plurality of pixel drive circuits PX provided in any embodiment of the present invention, and the display panel may include a plurality of criss-cross scanning lines ( S1～Sk) and data lines (DL1～DLj), the pixel drive circuit is located in the area defined by the scan line and the data line. Circuit PX provides scan signals. Because it includes the pixel driving circuit provided by any embodiment of the present invention, it also has the same beneficial effect, and will not be repeated here.

Fig. 12 is a schematic structural diagram of a display device provided by an embodiment of the present invention. Referring to Fig. 12, the display device includes a display panel provided by any embodiment of the present invention, and the display device can be a mobile phone, a tablet, a monitor, a smart watch, MP3, MP4 Or other wearable devices, etc., because they include the display panel provided by any embodiment of the present invention, they also have the same beneficial effect, and will not be repeated here.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. A pixel drive circuit, comprising: an analog data writing module, a driving module, a storage module, a light emitting module, a digital data writing module, a first reference voltage writing module, and a digital signal lighting control module; The analog data writing module is used to write analog data into the driving module, the driving module is used to generate a driving current, the light emitting module is used to respond to the driving current, and the storage module is used to maintain the The potential of the control terminal of the drive module; The digital data writing module is used to write digital data into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned on according to the digital data; The first reference voltage writing module is used to write a first reference voltage into the control terminal of the digital signal lighting control module, and the digital signal lighting control module is turned off according to the first reference voltage. 2. The pixel drive circuit according to claim 1, wherein the digital data writing module comprises a first transistor, and the first reference voltage writing module comprises a second transistor; The control end of the first transistor is connected to the first scan signal, the first end of the first transistor is used to write the digital data, the second end of the first transistor is connected to the digital signal light emitting control module The control terminal is electrically connected; The control terminal of the second transistor is connected to the first control signal, the first terminal of the second transistor is used to write the first reference voltage, and the second terminal of the second transistor is connected to the digital signal to emit light The control terminal of the control module is electrically connected. 3. The pixel drive circuit according to claim 2, wherein the digital data writing module further comprises a third transistor, and the first reference voltage writing module further comprises a fourth transistor; The control end of the third transistor is used to access the second scan signal, the first end of the third transistor is electrically connected to the first end of the first transistor, and the second end of the third transistor is electrically connected to the first end of the third transistor. The second terminal of the first transistor is electrically connected; the phase of the first scanning signal is opposite to that of the second scanning signal, the first transistor is an N-type transistor, and the third transistor is a P-type transistor; The control terminal of the fourth transistor is connected to the second control signal, the first terminal of the fourth transistor is electrically connected to the first terminal of the second transistor, and the second terminal of the fourth transistor is connected to the first terminal of the first transistor. The second terminals of the two transistors are electrically connected; the phase of the first control signal is opposite to that of the second control signal, the second transistor is a P-type transistor, and the fourth transistor is an N-type transistor. 4. The pixel driving circuit according to claim 2, further comprising a latch module; The latch module is used to maintain the potential of the control terminal of the digital signal lighting control module. 5. The pixel driving circuit according to claim 4, characterized in that, The latch module includes a first inverter and a second inverter, the input end of the first inverter is electrically connected to the control end of the digital signal lighting control module, and the first inverter The output end is electrically connected to the input end of the second inverter, and the output end of the second inverter is electrically connected to the second end of the first transistor; Alternatively, the latch module includes a first capacitor, the first end of the first capacitor is connected to the first power supply signal, and the second end of the first capacitor is electrically connected to the control end of the digital signal lighting control module . 6. The pixel driving circuit according to claim 1, wherein the control terminal of the analog data writing module is connected to the third scanning signal, and the first terminal of the analog data writing module is used for writing analog data, the second end of the analog data writing module is electrically connected to the control end of the driving module; The first end of the driving module is used to connect the first power signal, the second end of the driving module is electrically connected to the first end of the digital signal lighting control module, and the second end of the digital signal lighting control module It is electrically connected to the first end of the light emitting module, and the second end of the light emitting module is connected to the second power signal; The first terminal of the storage module is connected to the first power signal, and the second terminal of the storage module is electrically connected to the control terminal of the drive module; The first end of the digital data writing module is connected to digital data, and the second end of the digital data writing module is electrically connected to the control end of the digital signal lighting control module; The first terminal of the first reference voltage writing module is connected to the first reference voltage, and the second terminal of the first reference voltage writing module is electrically connected to the control terminal of the digital signal lighting control module. 7. The pixel driving circuit according to any one of claims 1-6, further comprising a first initialization module, a second initialization module, a threshold compensation module, a first analog signal light emission control module and a second analog signal Lighting control module; The control terminal of the first initialization module is connected to the fourth scanning signal, the first terminal of the first initialization module is connected to the second reference voltage, and the second terminal of the first initialization module is electrically connected to the control terminal of the driving module. connected, the first end of the storage module is electrically connected to the control end of the drive module, and the second end of the storage module is connected to a first power signal; the first initialization module is used to initialize the drive module; The control terminal of the second initialization module is connected to the fourth scan signal, the first terminal of the second initialization module is connected to the second reference voltage, the second terminal of the second initialization module is connected to the The first end of the light emitting module is electrically connected; the second initialization module is used to initialize the light emitting module; The control end of the analog data writing module is connected to the third scan signal, the first end of the analog data writing module is used to write analog data, the second end of the analog data writing module is connected to the drive the first end of the module is electrically connected; The first end of the driving module is electrically connected to the first end of the first analog signal lighting control module, and the second end of the driving module is electrically connected to the first end of the second analog signal lighting control module; The control terminal of the first analog signal lighting control module is connected to the enabling signal, and the second terminal of the first analog signal lighting control module is electrically connected to the first power supply signal; The control terminal of the threshold compensation module is connected to the third scan signal, the first terminal of the threshold compensation module is electrically connected to the control terminal of the driving module, and the second terminal of the threshold compensation module is connected to the second terminal of the threshold compensation module. The first terminals of the two analog signal lighting control modules are electrically connected; the threshold compensation module is used to capture the threshold voltage of the driving module to the control terminal of the driving module; The control terminal of the second analog signal lighting control module is connected to the enabling signal, and the second terminal of the second analog signal lighting control module is electrically connected to the digital signal lighting control module. 8. A driving method for a pixel driving circuit, for driving the pixel driving circuit according to any one of claims 1-7, characterized in that the driving method for the pixel driving circuit comprises: Obtain the brightness to be displayed; judging whether the brightness to be displayed satisfies a preset condition; If the brightness to be displayed satisfies the preset condition, then determine the analog data according to the brightness to be displayed; write the analog data into the drive module in the data writing phase, and write the digital data in the light emitting phase Continuously write the digital signal to the lighting control module; If the brightness to be displayed does not meet the preset condition, then determine the first conduction time of the digital data writing module and the second conduction time of the first reference voltage writing module according to the brightness to be displayed; In the data writing stage, the analog data is written into the driving module, and the digital data is written into the control terminal of the digital lighting control module during the first conduction time, and the first The reference voltage is written into the control terminal of the digital lighting control module, wherein the analog data is a fixed value. 9. The driving method according to claim 8, wherein the preset conditions include: The brightness to be displayed is greater than the preset brightness, or the binary data corresponding to the brightness to be displayed is opposite to the corresponding binary data of the current display brightness. 10. A display panel, comprising the pixel driving circuit according to any one of claims 1-7.

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