CN116229910A - Driving circuit and display device of display panel - Google Patents

Abstract

The embodiment of the invention discloses a driving circuit of a display panel and a display device. The driving circuit of the display panel includes: a voltage management chip; the voltage management chip comprises a power input end, a first power output end, a reference voltage output end and a gamma reference voltage output end; the first power supply output end, the reference voltage output end and the gamma reference voltage output end are respectively and electrically connected with the display panel; the voltage management chip is used for receiving input voltage through a power input end, outputting first power supply voltage through a first power output end, outputting reference voltage through a reference voltage output end and outputting gamma reference voltage through a gamma reference voltage output end. The embodiment of the invention can reduce the number of chips, reduce the cost, simplify the circuit, reduce the design difficulty of a schematic diagram PCB and shorten the project development period.

Description

Driving circuit and display device of display panel

technical field

Embodiments of the present invention relate to display driving technology, and in particular, to a driving circuit and a display device of a display panel.

Background technique

A timing controller (TCON) circuit usually consists of four circuits: a power management circuit, a gamma voltage generation circuit, a video signal conversion circuit, and a logic signal level conversion circuit. Now many main chip manufacturers have integrated the video signal conversion circuit into the main chip, and the difficulties in the design of the TCON part are concentrated on the power management circuit, the gamma voltage generation circuit and the logic signal level conversion circuit. The existing TCON circuit part has a large number of chips, complex circuits and high cost.

Contents of the invention

The invention provides a driving circuit and a display device of a display panel, so as to reduce the number of chips, reduce the cost, simplify the circuit, reduce the difficulty of schematic PCB design, and shorten the project development cycle.

In a first aspect, an embodiment of the present invention provides a driving circuit for a display panel, including:

Voltage management chip;

The voltage management chip includes a power input terminal, a first power output terminal, a reference voltage output terminal and a gamma reference voltage output terminal; the first power output terminal, the reference voltage output terminal and the gamma reference voltage output terminal are respectively connected to the display panel electrical connection;

The voltage management chip is used to receive an input voltage through a power supply input terminal, output a first power supply voltage through the first power supply output terminal, output a reference voltage through a reference voltage output terminal, and output a gamma reference through a gamma reference voltage output terminal Voltage.

Optionally, the drive circuit also includes:

Logic signal conversion chip;

The voltage management chip also includes a second power supply output terminal, and the second power supply output terminal is used to output a second power supply voltage;

The logic signal conversion chip includes a power supply terminal, an input terminal, a first output terminal and a second output terminal;

The power supply terminal is electrically connected to the second power supply output terminal, and the first output terminal and the second output terminal are respectively electrically connected to the display panel;

The input end is used to receive a first control signal, the first output end is used to output a clock signal, and the second output end is used to output a second control signal.

Optionally, the second power supply output terminal includes a high-level output terminal and a low-level output terminal, and the power supply terminal of the logic signal conversion chip includes a first power supply terminal and a second power supply terminal;

The high-level output terminal is electrically connected to the first power supply terminal, and the low-level output terminal is electrically connected to the second power supply terminal.

Optionally, the first power supply output terminal includes a first terminal, a second terminal and a third terminal, and the first terminal, the second terminal and the third terminal are used to respectively provide different power supply voltages for the display panel .

Optionally, the voltage management chip includes multiple gamma reference voltage output terminals.

Optionally, the voltage management chip further includes a communication port for receiving debugging signals.

In a second aspect, an embodiment of the present invention further provides a display device, including a display panel and a driving circuit for the display panel according to any embodiment of the present invention.

Optionally, the display device also includes:

main control circuit;

The input end of the voltage management chip in the drive circuit of the display panel is electrically connected to the voltage output end of the main control circuit, and the input end of the logic signal conversion chip is electrically connected to the second control output end of the main control circuit.

Optionally, the main control circuit further includes a video signal output terminal and a first control output terminal, the video signal output terminal and the first control output terminal are respectively electrically connected to the display panel, and the video signal output terminal is used to The video signal output by the display panel, the first control output terminal is used to output a display control signal to the display panel.

Optionally, the display panel is a liquid crystal display panel.

In the embodiment of the present invention, only one voltage management chip can be used to supply power to the display panel, provide a gamma reference voltage and a reference voltage, and there is no need to set up a gamma chip separately, which reduces the number of chips, reduces the cost, simplifies the circuit, and reduces the principle Figure PCB design difficulty, and shorten the project development cycle.

Description of drawings

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

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

Fig. 3 is a schematic diagram of a voltage management chip provided by an embodiment of the present invention.

Detailed ways

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.

An embodiment of the present invention provides a driving circuit for a display panel. The driving circuit may be a TCON circuit of the display panel. FIG. 1 is a schematic diagram of a driving circuit for a display panel provided by an embodiment of the present invention. Referring to FIG. 1 , the driving circuit include:

Voltage management chip 10;

The voltage management chip 10 includes a power input terminal 11, a first power output terminal 12, a reference voltage output terminal 13 and a gamma reference voltage output terminal 14; the first power output terminal 12, a reference voltage output terminal 13 and a gamma reference voltage output terminal 14 are respectively electrically connected to the display panel 20;

The voltage management chip 10 is used to receive the input voltage through the power input terminal 11, output the first power supply voltage through the first power output terminal 12, output the reference voltage through the reference voltage output terminal 13, and output gamma through the gamma reference voltage output terminal 14 The reference voltage.

Specifically, referring to FIG. 1, the power input terminal 11 of the voltage management chip 10 can be connected to the main control circuit 40 of the display panel 20, and the main control circuit 40 provides an input voltage for the voltage management chip 10. Exemplarily, the main control circuit 40 The voltage output terminal 45 is electrically connected to the power input terminal 11 of the voltage management chip 10 to provide the voltage management chip 10 with an input voltage of 12V. The voltage management chip 10 integrates the functions of power supply, outputting the gamma reference voltage GAMMA, and outputting the reference voltage VCOM. Specifically, the power supply circuit and the gamma voltage generating circuit can be packaged together to form the voltage management chip 10 . Wherein, the power supply circuit is mainly used to generate the first power supply voltage required by the display panel and the power supply voltage required by the gamma voltage generation circuit. The gamma voltage generation circuit is mainly used to generate gamma reference voltage and reference voltage.

In addition, referring to FIG. 1 , the main control circuit 40 also includes a video signal output terminal 41 and a first control output terminal 42, which are electrically connected to the display panel 20 respectively, and the video signal output terminal 41 is used to output the video signal to be displayed to the display panel 20 , the first control output terminal 42 is used to output a display control signal. The main control circuit 40 can be integrated on the main board of the display panel.

In this embodiment, only one voltage management chip 10 can be used to supply power to the display panel, provide a gamma reference voltage and a reference voltage, and do not need to set a gamma chip separately, which reduces the cost, simplifies the circuit, and reduces the difficulty of schematic PCB design. And shorten the project development cycle.

Fig. 2 is a schematic diagram of a driving circuit of another display panel provided by an embodiment of the present invention. Optionally, referring to Fig. 2, the driving circuit further includes:

Logic signal conversion chip 30;

The voltage management chip 10 also includes a second power supply output terminal, the second power supply output terminal is used to output a second power supply voltage;

The logic signal conversion chip 30 includes a power supply terminal 31, an input terminal 32, a first output terminal 33 and a second output terminal 34;

The power supply terminal 31 is electrically connected to the second power supply output terminal, and the first output terminal 33 and the second output terminal 34 are electrically connected to the display panel 20 respectively;

The input terminal 32 is used for receiving the first control signal, the first output terminal 33 is used for outputting the clock signal, and the second output terminal 34 is used for outputting the second control signal.

Specifically, the input terminal 32 of the logic signal conversion chip 30 can be electrically connected with the second control output terminal 43 of the main control circuit 40, and receives the first control signal output by the main control circuit 40, and the logic signal conversion chip 30 is used for converting the first The voltage level of the control signal is converted, for example, the first control signal is boosted or buckled to obtain the second control signal, and the logic signal conversion chip 30 is also used to output the clock signal, and the second control signal and the clock signal are used to control the display panel 20 Turning on and off of the TFT transistor in the

Exemplarily, the input terminal 32 of the logic signal conversion chip 30 may include multiple input terminals, such as input terminals such as STV_IN, CLR_IN, CPV1 and CPV2, and the first output terminal 33 may include multiple clock signal output terminals, such as including Eight clock signal input terminals, output 8 clock signals CLK1-CLK8. The second output terminal 34 may also include multiple ports, and output various control signals, such as outputting signals such as STV_OUT, CLR_OUT, and VSS.

In addition, the main control circuit 40 also includes a first debugging terminal 44, the first debugging terminal 44 is respectively electrically connected with the logic signal conversion chip 30 and the display panel 20, and is used for panel debugging. connect.

In this embodiment, only one voltage management chip 10 can be used to supply power for the display panel, provide the gamma reference voltage, provide the reference voltage, and supply power for the logic signal conversion chip without setting multiple chips, which reduces the cost.

FIG. 3 is a schematic diagram of a voltage management chip provided by an embodiment of the present invention. Optionally, referring to FIG. 2 and FIG. The power supply terminal 31 of the conversion chip 30 includes a first power supply terminal and a second power supply terminal;

The high-level output terminal 151 is electrically connected to the first power supply terminal, and the low-level output terminal 152 is electrically connected to the second power supply terminal.

Specifically, the high-level output terminal 151 is used to provide a high-potential signal VGH to the first power supply terminal, and the low-level output terminal 152 is used to provide a low-potential signal VHL to the second power supply terminal. By setting the second power output terminal of the voltage management chip to include a high-level output terminal 151 and a low-level output terminal 152 , the power requirement of the logic signal conversion chip 30 is met.

Optionally, the first power supply output terminal includes a first terminal 121, a second terminal 122 and a third terminal 123, and the first terminal 121, the second terminal 122 and the third terminal 123 are used to respectively provide different power supply voltages for the display panel .

Wherein, the first terminal 121 can output the first level signal AVDD, the second terminal 122 can output the second level signal HAVDD, and the third terminal 123 can output the third level signal DVDDL. By setting the first power supply output terminal to include a plurality of output terminals outputting different power supply voltages, the requirements of different levels inside the display panel can be met.

Optionally, the voltage management chip 10 includes multiple gamma reference voltage output terminals.

Specifically, the voltage management chip 10 can output multiple different gamma reference voltages. For example, the voltage management chip 10 includes 18 gamma reference voltage output terminals for outputting 18 gamma reference voltages GAM1-GAM18. Setting multiple gamma reference voltage output terminals to output multiple different gamma voltages can better meet the display requirements of the display panel 20 .

Optionally, continuing to refer to FIG. 2 , the voltage management chip 10 further includes a communication port 16 for receiving debugging signals.

Specifically, the communication port 16 is electrically connected to the main control circuit 40 for receiving the debugging signal output by the main control circuit 40 to debug the voltage management chip 10 so that the working parameters of the voltage management chip 10 meet the display requirements of the display panel.

An embodiment of the present invention also provides a display device. Referring to FIG. 2 , the display device includes a display panel 20 and a driving circuit for the display panel according to any embodiment of the present invention.

Wherein, the driving circuit of the display panel may be arranged on the driving board of the display panel, and be electrically connected to the display panel through pads or wires.

The display device driving circuit of this embodiment can realize power supply for the display panel, provide gamma reference voltage and reference voltage by only using one voltage management chip, and there is no need to set up a gamma chip separately, which reduces the cost, simplifies the circuit, and reduces the schematic diagram. PCB design difficulty, and shorten the project development cycle.

Optionally, the display device also includes:

main control circuit 40;

The input terminal 11 of the voltage management chip 10 is electrically connected to the voltage output terminal 45 of the main control circuit 40 , and the input terminal 32 of the logic signal conversion chip 30 is electrically connected to the second control output terminal 43 of the main control circuit 40 .

Wherein, the main control circuit 40 may be disposed on the main board of the display panel 20 .

Optionally, the main control circuit 40 also includes a video signal output terminal 41 and a first control output terminal 42, which are respectively electrically connected to the display panel 20, the video signal output terminal 41 is used to output video signals to the display panel 20, and the first control output terminal 42 The output terminal 42 is used for outputting display control signals to the display panel.

Specifically, the main control circuit 40 includes a video signal conversion circuit for outputting a video signal that can be recognized by the display panel.

Optionally, the display panel is a liquid crystal display panel. The display panel may also be another type of display panel, which is not specifically limited in this embodiment.

The display device provided in this embodiment and the driving circuit of the display panel provided in any embodiment of the present invention belong to the same inventive concept, and have corresponding beneficial effects. Please refer to any embodiment of the present invention for detailed technical details not described in this embodiment. The driving circuit of the display panel.

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 here, and various obvious changes, readjustments, mutual combinations 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 drive circuit for a display panel, comprising: Voltage management chip; The voltage management chip includes a power input terminal, a first power output terminal, a reference voltage output terminal and a gamma reference voltage output terminal; the first power output terminal, the reference voltage output terminal and the gamma reference voltage output terminal are respectively connected to the display panel electrical connection; The voltage management chip is used to receive an input voltage through a power supply input terminal, output a first power supply voltage through the first power supply output terminal, output a reference voltage through a reference voltage output terminal, and output a gamma reference through a gamma reference voltage output terminal Voltage. 2. The drive circuit according to claim 1, further comprising: Logic signal conversion chip; The voltage management chip also includes a second power supply output terminal, and the second power supply output terminal is used to output a second power supply voltage; The logic signal conversion chip includes a power supply terminal, an input terminal, a first output terminal and a second output terminal; The power supply terminal is electrically connected to the second power supply output terminal, and the first output terminal and the second output terminal are respectively electrically connected to the display panel; The input end is used to receive a first control signal, the first output end is used to output a clock signal, and the second output end is used to output a second control signal. 3. The driving circuit according to claim 2, characterized in that: The second power output terminal includes a high-level output terminal and a low-level output terminal, and the power supply terminal of the logic signal conversion chip includes a first power supply terminal and a second power supply terminal; The high-level output terminal is electrically connected to the first power supply terminal, and the low-level output terminal is electrically connected to the second power supply terminal. 4. The driving circuit according to claim 1, characterized in that: The first power output terminal includes a first terminal, a second terminal and a third terminal, and the first terminal, the second terminal and the third terminal are used to respectively provide different power supply voltages for the display panel. 5. The driving circuit according to claim 1, characterized in that: The voltage management chip includes multiple gamma reference voltage output terminals. 6. The driving circuit according to claim 1, characterized in that: The voltage management chip also includes a communication port for receiving debugging signals. 7. A display device, characterized by comprising a display panel and a driving circuit for the display panel according to any one of claims 1-6. 8. The display device according to claim 7, further comprising: main control circuit; The input end of the voltage management chip in the drive circuit of the display panel is electrically connected to the voltage output end of the main control circuit, and the input end of the logic signal conversion chip is electrically connected to the second control output end of the main control circuit. 9. The display device according to claim 8, characterized in that: The main control circuit also includes a video signal output terminal and a first control output terminal, the video signal output terminal and the first control output terminal are respectively electrically connected to the display panel, and the video signal output terminal is used to output to the display panel A video signal, the first control output terminal is used to output a display control signal to the display panel. 10. The display device according to claim 7, characterized in that: The display panel is a liquid crystal display panel.

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