CN108922473B - An organic light-emitting display panel and a driving method thereof - Google Patents

Abstract

The present invention discloses an organic light-emitting display panel and a driving method thereof, so as to improve the production difficulty of the display panel due to the denser and denser pixel driving circuits on the array substrate of the organic light-emitting display panel, and the production yield is also reduced. The problem is gradually reduced. The organic light-emitting display panel includes: a plurality of pixel units distributed in an array, at least some of the pixel units include a first type of light-emitting device and a second type of light-emitting device; the cathode of the first type of light-emitting device and a The anode of the second type of light-emitting device is connected to the same end of the same pixel driving circuit; or, the anode of the first type of light-emitting device and the cathode of a second type of light-emitting device are connected to the same terminal the same end of the pixel driving circuit, so that the first type of light-emitting device and the second type of light-emitting device share the same pixel driving circuit.

Description

An organic light-emitting display panel and a driving method thereof

technical field

The present invention relates to the technical field of semiconductors, and in particular, to an organic light-emitting display panel and a driving method thereof.

Background technique

Flat panel displays (F1at Pane1Disp1ay, FPD) have become mainstream products on the market, and there are more and more types of flat panel displays, such as liquid crystal displays (Liquid Crysta1Disp1ay, LCD), organic light emitting diodes (Organic Light Emitted Diode, OLED) displays, plasma Display panel (P1asma Disp1ay Panel, PDP) and Field Emission Display (Field Emission Display, FED) and so on.

The Thin Film Transistor (TFT) backplane technology, which is the core technology of the FPD industry, is also undergoing profound changes. However, as the pixel density increases, the TFT circuits on the array substrate on the OLED display screen become denser and more difficult to produce, and the production yield is gradually reduced.

SUMMARY OF THE INVENTION

The present invention provides an organic light-emitting display panel and a driving method thereof, so as to improve the production difficulty of the display panel as the pixel driving circuits on the array substrate of the organic light-emitting display panel become more and more dense, and the production yield is also increasing. Gradually reduce the problem.

An embodiment of the present invention provides an organic light-emitting display panel, comprising: a plurality of pixel units distributed in an array, at least some of the pixel units include a first type of light-emitting device and a second type of light-emitting device; wherein,

The second type of light-emitting device includes an anode, an organic light-emitting layer located on the anode, and a cathode located on the organic light-emitting layer, which are located on the base substrate in sequence; the first type of light-emitting device includes a cathode located on the base substrate, an organic light-emitting layer located on the cathode, and an anode located on the organic light-emitting layer in sequence;

In the same pixel unit, the cathode of each first-type light-emitting device and the anode of a one-to-one corresponding one of the second-type light-emitting devices are connected to the same end of the same pixel driving circuit, and the The anode of the first type of light-emitting device and the cathode of the second type of light-emitting device are connected to a first power supply terminal; or, in the same pixel unit, the The anode and the cathode of the second type of light-emitting device in one-to-one correspondence are connected to the same end of the same pixel drive circuit, and the cathode of the first type of light-emitting device is connected to the second type of light-emitting device. The anode is connected to the first power supply terminal, so that the first type of light-emitting device and the second type of light-emitting device share the same pixel driving circuit, and are driven by alternating voltages, so that the The first type of light emitting device and the second type of light emitting device emit light alternately.

Optionally, the first type of light-emitting device and/or the second type of light-emitting device is further provided with one or more of the following film layers between the cathode and the organic light-emitting layer:

An electron injection layer, an electron transport layer and a hole blocking layer, wherein the electron transport layer is located on the side of the electron injection layer close to the organic light-emitting layer, and the hole blocking layer is located close to the electron transport layer one side of the organic light-emitting layer;

The first type of light-emitting device and/or the second type of light-emitting device is further provided with one or more of the following film layers between the anode and the organic light-emitting layer:

A hole injection layer, a hole transport layer and an electron blocking layer, wherein the hole transport layer is located on the side of the hole injection layer close to the organic light-emitting layer, and the electron blocking layer is located on the hole The transport layer is close to the side of the organic light-emitting layer.

Optionally, the first type of light-emitting device includes one or two light-emitting devices.

Optionally, the first type of light-emitting device includes a red light-emitting device, and the second type of light-emitting device includes a green light-emitting device and a blue light-emitting device;

The first type of light-emitting device includes a green light-emitting device, and the second type of light-emitting device includes a red light-emitting device and a blue light-emitting device;

The first type of light-emitting device includes a blue light-emitting device, and the second type of light-emitting device includes a red light-emitting device and a green light-emitting device;

The first type of light-emitting device includes a white light-emitting device, and the second type of light-emitting device includes a red light-emitting device, a green light-emitting device, and a blue light-emitting device.

Optionally, the pixel driving circuit includes a first control module, a storage module, and a second control module, wherein,

The first control module is respectively connected with the scan signal terminal, the data signal terminal and the first node; the first control module is used for providing the signal of the data signal terminal to the said scan signal terminal under the control of the signal of the scan signal terminal the first node;

The storage module is respectively connected to the first node and the second power supply terminal; the storage module is used for charging or discharging under the control of the signal of the first node and the signal of the second power supply terminal;

The second control module is respectively connected to the first node, the second power terminal, the cathode of the first type of light-emitting device and the anode of the second type of light-emitting device; or, the The second control module is respectively connected to the first node, the second power terminal, the anode of the first type of light-emitting device and the cathode of the second type of light-emitting device; the second control module Under the control of the signal of the first node and the signal of the second power supply terminal, the first type of light-emitting device and the second type of light-emitting device are controlled to emit light alternately.

Optionally, the first control module includes a first transistor; wherein,

The control electrode of the first transistor is connected to the scan signal end, the first electrode of the first transistor is connected to the data signal end, and the second electrode of the first transistor is connected to the first node.

Optionally, the storage module includes: a capacitor; wherein,

The capacitor is connected between the first node and the second power terminal.

Optionally, the second control unit includes: a second transistor; wherein,

The control electrode of the second transistor is connected to the first node, the first electrode of the second transistor is connected to the second power supply terminal, and the second electrode of the second transistor is connected to the first type of light-emitting The cathode of the device and the anode of the second type of light-emitting device are connected, or the second electrode of the second transistor is connected to the anode of the first type of light-emitting device and the second type of light-emitting device connected to the cathode.

Embodiments of the present invention further provide a driving method for driving the organic light-emitting display panel according to the embodiments of the present invention, including:

providing the organic light-emitting display panel;

The alternating voltage is input to the pixel driving circuit connected with the first type light emitting device and the second type light emitting device, so that the first type light emitting device and the second type light emitting device emit light alternately.

Optionally, inputting alternating voltages to the pixel driving circuit connected with the first type of light-emitting device and the second type of light-emitting device includes:

The alternating voltage is input to the second power supply terminal of the pixel drive circuit connected with the first type of light-emitting device and the second type of light-emitting device, and the frequency and voltage value of the input AC voltage are controlled, so as to control the input of the first type of light-emitting device and the second type of light-emitting device. The mixed light color of one type of light-emitting device and the second type of light-emitting device is controlled.

The beneficial effects of the embodiments of the present invention are as follows: in the embodiments of the present invention, for the pixel units of the organic light emitting display panel, at least some of the pixel units include a first type of light-emitting device and a second type of light-emitting device, and the second type of Above the substrate: an anode, an organic light-emitting layer on the anode, and a cathode on the organic light-emitting layer; the first type of light-emitting device includes a cathode on the substrate substrate, and an organic light-emitting layer on the cathode. 2. The anode located on the organic light-emitting layer, that is, each film layer of the first type of light-emitting device is set upside down, and it is connected with the different electrodes of another second-type light-emitting device in the same pixel driving circuit. The pixel driving circuit is supplied with alternating voltages. Since the first type of light-emitting device and the second type of light-emitting device are connected to different cathodes and anodes, for a bias voltage in the same time period, only one light-emitting device can be turned on to emit light. For the reverse bias voltage of another time period, the other light-emitting device can be turned on to emit light, so that two light-emitting devices can be driven to emit light by one pixel driving circuit, which reduces the number of pixel driving circuits and improves the performance. As the pixel driving circuits on the array substrate of the organic light emitting display panel become more and more dense, the production of the display panel becomes more and more difficult, and the production yield is also gradually reduced.

Description of drawings

FIG. 1 is a schematic structural diagram of an organic light-emitting display panel according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a specific organic light-emitting display panel provided by an embodiment of the present invention;

3 is a schematic structural diagram of a pixel driving circuit of an organic light-emitting display panel according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a specific pixel driving circuit of an organic light-emitting display panel according to an embodiment of the present invention;

FIG. 5 is a schematic timing diagram of an organic light-emitting display panel according to an embodiment of the present invention;

6 is a schematic flowchart of a method for driving an organic light-emitting display panel according to an embodiment of the present invention;

FIG. 7 is a schematic diagram after color mixing of two light-emitting devices of an organic light-emitting display panel according to an embodiment of the present invention;

8 is a schematic diagram of a pixel arrangement structure of an organic light-emitting display panel according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an organic light-emitting layer after vapor deposition using a mask according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of well-known functions and well-known components.

Referring to FIG. 1 , an embodiment of the present invention provides an organic light-emitting display panel, including: a plurality of pixel units distributed in an array, at least some of the pixel units include a first type of light-emitting device S1 and a second type of light-emitting device S2, for example, a pixel unit It includes three light-emitting devices of red, green and blue, wherein the red light-emitting device is the first type of light-emitting device S1, and the other light-emitting devices of other colors are the second type of light-emitting device S2; for another example, the pixel unit includes: red, green, There are four light-emitting devices of blue and white, the red light-emitting device is a first-type light-emitting device S1, the green light-emitting device is another first-type light-emitting device S1, and the remaining light-emitting devices of other colors are the second-type light-emitting device S2; wherein,

The second type of light-emitting device S2 includes an anode 2, an organic light-emitting layer 3 located on the anode 2, and a cathode 4 located on the organic light-emitting layer 3, which are located on the base substrate 1 in sequence; the first type of light-emitting device S1 includes The cathode 4 is located on the base substrate 1, the organic light-emitting layer 3 is located on the cathode 4, and the anode 2 is located on the organic light-emitting layer 3; in specific implementation, the first type of light-emitting device S1 and the second type of light-emitting device The material of the organic light-emitting layer of the device S2 may be different.

In the same pixel unit, the cathode 4 of each first-type light-emitting device S1 and the anode 2 of a one-to-one corresponding second-type light-emitting device S2 are connected to the same end of the same pixel driving circuit (that is, if the first-type light-emitting device includes Red light-emitting device and green light-emitting device, the second type of light-emitting device includes blue light-emitting device and white light-emitting device, then the cathode of the red light-emitting device and the anode of the blue light-emitting device are connected to the same end of the same pixel drive circuit, and the green light-emitting device The cathode and the anode of the white light-emitting device are connected to the same end of the same pixel drive circuit, that is, the first type of light-emitting device and the second type of light-emitting device are connected to the same pixel drive circuit in a one-to-one manner), the first type of light-emitting device The anode 2 of S1 and the cathode 4 of the second-type light-emitting device S2 are connected to the first power supply terminal; or, in the same pixel unit, the anode 2 of each first-type light-emitting device S1 corresponds to a second-type light-emitting device one-to-one The cathode 4 of the device S2 is connected to the same end of the same pixel drive circuit, and the cathode 4 of the first type of light-emitting device S1 and the anode 2 of the second type of light-emitting device S2 are connected to the first power supply terminal, so that the first type of light-emitting device S1 and the second type of light-emitting device S2 share the same pixel driving circuit, and are driven by alternating voltage. The first type of light-emitting device S1 and the second type of light-emitting device S2 emit light alternately.

In the embodiment of the present invention, for a pixel unit of an organic light emitting display panel, at least some of the pixel units include a first type of light-emitting device and a second type of light-emitting device, and the second type of light-emitting device includes: an anode, an anode located on the The organic light-emitting layer on the anode, and the cathode on the organic light-emitting layer; the first type of light-emitting device includes a cathode on the substrate, an organic light-emitting layer on the cathode, and a light-emitting layer on the organic light-emitting layer. The anode, that is, the film layers of the first type of light-emitting device are arranged upside down, and it is connected to the same pixel driving circuit with the different electrodes of another second-type light-emitting device, and the pixel driving circuit is switched by alternating Since the cathode and anode of the first type of light-emitting device and the second type of light-emitting device are connected to the circuit are different, for a bias voltage in the same time period, only one light-emitting device can be turned on to emit light, and for the reverse direction of another time period If the bias voltage is applied, the other light-emitting device can be turned on to emit light, so that two light-emitting devices can be driven to emit light by one pixel driving circuit, which reduces the number of pixel driving circuits and improves the performance of the organic light-emitting display panel array substrate. Pixel drive circuits are becoming more and more dense, resulting in more and more difficulties in the production of display panels, and the production yield is gradually decreasing.

In specific implementation, each pixel unit may be set to the first type of light-emitting device and the second type of light-emitting device, that is, each pixel unit has a structure in which two light-emitting devices are driven by one pixel driving circuit; Some pixel units may be provided with the first type of light-emitting device and the second type of light-emitting device, which is not limited in this application.

In a specific implementation, as shown in FIG. 2 , the first type of light-emitting device S1 and/or the second type of light-emitting device S2 are further provided with one or more of the following film layers between the cathode 4 and the organic light-emitting layer 3: The electron injection layer 41, the electron transport layer 42 and the hole blocking layer 43, wherein the electron transport layer 42 is located on the side of the electron injection layer 41 close to the organic light emitting layer 3, and the hole blocking layer 43 is located on the electron transport layer 42 close to the organic light emitting layer One side of layer 3; the first type of light-emitting device S1 and/or the second type of light-emitting device S2 are also sequentially provided with one or more of the following film layers between the anode 2 and the organic light-emitting layer 3: a hole injection layer 21. The hole transport layer 22 and the electron blocking layer 23, wherein the hole transport layer 22 is located on the side of the hole injection layer 21 close to the organic light emitting layer 3, and the electron blocking layer 23 is located on the hole transport layer 22 close to the organic light emitting layer. 3 side. In specific implementation, a light extraction film layer 5 may also be provided above the anode 2 of the first type of light emitting device S1 and above the cathode 4 of the second type of light emitting device S2 to increase the light extraction efficiency of the organic light emitting display panel.

It should be noted that FIG. 2 is only an example where each light-emitting device includes an electron injection layer 41 , an electron transport layer 42 , a hole blocking layer 42 , a hole injection layer 21 , a hole transport layer 22 and an electron blocking layer 23 . It should be noted that, in specific implementation, only some of the above film layers may be included, and the present invention is not limited to this.

In a specific implementation, the first type of light-emitting device S1 may include one or two light-emitting devices.

Correspondingly, the first type of light-emitting device S1 may include a red light-emitting device, and the second type of light-emitting device S2 may include a green light-emitting device and a blue light-emitting device; the first type of light-emitting device may include a green light-emitting device, and the second type of light-emitting device may include Red light-emitting devices and blue light-emitting devices; the first type of light-emitting devices may include blue light-emitting devices, the second type of light-emitting devices may include red light-emitting devices and green light-emitting devices; the first type of light-emitting devices may include white light-emitting devices, and the second type of light-emitting devices The devices may include red light emitting devices, green light emitting devices, and blue light emitting devices.

In a specific implementation, as shown in FIG. 3 , the pixel driving circuit includes a first control module 61 , a storage module 63 , and a second control module 62 , wherein,

The first control module 61 is respectively connected with the scan signal terminal Date, the data signal terminal Vdate and the first node P; the first control module 61 is used to provide the signal of the data signal terminal Vdate to the first node under the control of the scan signal terminal Date P;

The storage module 63 is respectively connected to the first node P and the second power supply terminal VDD, the first power supply terminal is VSS, and the first power supply terminal VSS can be grounded specifically; the storage module 63 is used for the signal at the first node P and the second power supply terminal Charge or discharge under the control of the VDD signal;

The second control module 62 is respectively connected to the first node P, the second power supply terminal VDD, the anode of the first type of light-emitting device S1 (as shown in OLED1) and the cathode of the second type of light-emitting device S2 (as shown in OLED2); or , the second control module 62 is respectively connected to the first node P, the second power supply terminal VDD, the cathode of the first type of light-emitting device S1 and the anode of the second type of light-emitting device S2; the second control module 62 is used for the first node P The first type of light-emitting device S1 and the second type of light-emitting device S2 are controlled to emit light alternately under the control of the signal of the second power supply terminal VDD and the signal of the second power supply terminal VDD.

It should be noted that the pixel driving circuit provided by the present application is a pixel driving circuit when two light-emitting devices are connected to the same pixel driving circuit, and the AC voltage is used to drive the light-emitting pixel driving circuit, while for other pixel driving circuits in the embodiments of the present invention , one light-emitting device may also correspond to one pixel driving circuit, and the pixel driving circuit at this time may be set in the same manner as the pixel driving circuit in the prior art. That is, for example, the pixel unit of the organic light emitting display panel includes three light emitting devices of red, green and blue, wherein the red light emitting device and the green light emitting device are connected in the same pixel driving circuit, and the pixel driving circuit may be as shown in FIG. 3 . The structure of the pixel driving circuit shown in the figure, and for the blue light-emitting device, the corresponding pixel driving circuit can be the same as the structure of the pixel driving circuit in the prior art.

In a specific implementation, as shown in FIG. 4 , the first control module 61 may include a first transistor T1; wherein, the control electrode of the first transistor T1 is connected to the scan signal terminal Date, and the first electrode of the first transistor T1 is connected to the data signal The terminal Vdate is connected, and the second pole of the first transistor T1 is connected to the first node P.

During specific implementation, the storage module 63 may specifically include: a capacitor C1; wherein, the capacitor C1 is connected between the first node P and the second power supply terminal VDD.

In a specific implementation, the second control module 62 may include: a second transistor T2; wherein the control electrode of the second transistor T2 is connected to the first node P, the first electrode of the second transistor T2 is connected to the second power supply terminal VDD, The second electrode of the second transistor T2 is connected to the anode of the first type light emitting device S101 (eg OLED1 ) and the cathode of the second type light emitting device S2 (eg OLED2 ), or the second electrode of the second transistor T2 is connected to the first type light emitting device S101 (eg OLED1 ) The cathode of the light-emitting device S1 and the anode of the second-type light-emitting device S2 are connected.

In order to more clearly understand the display principle of the organic light emitting display panel provided by the embodiments of the present invention, the present invention will be further described in detail with the timing diagram shown in FIG. 5 taking the circuit diagram shown in FIG. 4 as an example.

During the first time period t1, the second power supply terminal VDD inputs a high-level signal, the scanning signal terminal Gate inputs a low-level signal, and the data signal terminal Vdate inputs a high-level signal (in specific implementation, the voltage value of Vdate can be adjusted according to needs. It is set to a high level or a low level, and this application takes the Vdate inputting a high level signal as an example for description), and the first power supply terminal Vss is grounded.

When a low-level signal is input to the scanning signal terminal Gate, the first transistor T1 is in an on state (taking the first transistor T1 as a P-type thin film transistor as an example), the first type of light-emitting device S1 (such as OLED1) emits light, and the second type of light-emitting device emits light Device S2 (eg OLED2) does not emit light. At the same time, capacitor C1 begins to charge.

During the second time period t2, the second power terminal VDD inputs a high-level signal, the scan signal terminal Gate receives a high-level signal, the data signal terminal Vdate receives a low-level signal, and the first power terminal VSS is grounded.

When a high-level signal is input to the scanning signal terminal Gate, the first transistor T1 is in an off state (taking the first transistor T1 as a P-type thin film transistor as an example), the capacitor C1 begins to discharge, and the first type of light-emitting device S1 continues to emit light. The type II light-emitting device S2 does not emit light.

During the third time period t3, the second power terminal VDD inputs a low-level signal, the scan signal terminal Gate receives a low-level signal, the data signal terminal Vdate receives a high-level signal, and the first power terminal Vss is grounded.

When a low-level signal is input to the scanning signal terminal Gate, the first transistor T1 is in an on state (taking the first transistor T1 as a P-type thin-film transistor as an example). S2 emits light, and the first type light-emitting device S1 does not emit light. At the same time, capacitor C1 begins to charge.

In the fourth time period t4, the second power terminal VDD inputs a low-level signal, the scan signal terminal Gate receives a high-level signal, the data signal terminal Vdate receives a low-level signal, and the first power terminal Vss is grounded.

When a high-level signal is input to the scanning signal terminal Gate, the first transistor T1 is in an off state (taking the first transistor T1 as a P-type thin film transistor as an example), the capacitor C1 begins to discharge, and the second type light-emitting device S2 continues to emit light. One type of light-emitting device S1 does not emit light.

Based on the same inventive concept, referring to FIG. 6 , an embodiment of the present invention further provides a driving method for driving an organic light-emitting display panel according to an embodiment of the present invention, including:

Step S101, providing an organic light emitting display panel.

Step S102 , input alternating voltages to the pixel driving circuit connected with the first type light emitting device and the second type light emitting device, so that the first type light emitting device and the second type light emitting device emit light alternately. Specifically, for example, a voltage whose positive and negative values are alternately changed may be input.

In a specific implementation, when the pixel driving circuit is the pixel driving circuit shown in FIG. 3 , for step S102 , input alternating voltages to the pixel driving circuit connected with the first type of light-emitting device and the second type of light-emitting device, including : input an AC voltage to the second power supply terminal of the pixel drive circuit connected with the first type of light-emitting device and the second type of light-emitting device, and control the frequency and voltage value of the input AC voltage, so that the first type of light-emitting device and the second type of light-emitting device are The mixed light color of the second type of light-emitting device is controlled. That is, in a specific implementation, as shown in FIG. 7 , when an alternating current (eg, 50 Hz) is supplied, the first type of light-emitting device (for example, the first type of light-emitting device is a red light-emitting device R) and the second type of light-emitting device (for example, The second type of light-emitting device is the green light-emitting device G) to light up alternately (wherein, the white area represents the non-light-emitting area). The device R) and the second type of light-emitting device (green light-emitting device G) light up the screen to overlap and then match to produce yellow, that is, after mixing, it is equivalent to the yellow light-emitting device Y. That is, by controlling the AC voltage to take a value between, for example, +7V to -7V, the current of the first type of light-emitting device and the second type of light-emitting device are controlled, and the grayscale of the two light-emitting devices is further controlled. By controlling the frequency and frequency of the AC voltage and The voltage change further realizes the control of the synthetic color of the first type of light-emitting device and the second type of light-emitting device.

In a specific implementation, the arrangement of each light-emitting device in the organic light display panel can be as shown in FIG. 8 , wherein, due to the low luminous efficiency of the blue light-emitting device, the blue light-emitting device can cover a larger area, that is, larger than the red light-emitting device. The area covered by the light-emitting device and the blue light-emitting device.

In the specific implementation, when the arrangement of each light-emitting device in the organic light display panel is as shown in FIG. 8 , the schematic diagram after vapor deposition of the organic light-emitting layer by using a mask can be as shown in FIG. 9 , which is the same as that shown in FIG. 8 . The covered areas of the individual light emitting devices are matched.

To sum up, the beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, for the pixel units of the organic light-emitting display panel, at least some of the pixel units include a first type of light-emitting device and a second type of light-emitting device, and the second type of light-emitting device includes sequential light-emitting devices. On the base substrate: an anode, an organic light-emitting layer on the anode, and a cathode on the organic light-emitting layer; the first type of light-emitting device includes a cathode on the base substrate, a cathode on the cathode The organic light-emitting layer and the anode located above the organic light-emitting layer, that is, each film layer of the first type of light-emitting device is arranged upside down, and it is connected with the different electrodes of another second-type light-emitting device in the same pixel driving circuit , by feeding alternating voltages to the pixel drive circuit, since the cathode and anode of the first type light-emitting device and the second type light-emitting device are connected to the circuit are different, for a bias voltage in the same time period, only one light-emitting device can conduct For the reverse bias voltage of another time period, the other light-emitting device can be turned on to emit light, and then two light-emitting devices can be driven to emit light by one pixel driving circuit, which reduces the number of pixel driving circuits. This further improves the problem that the production of the display panel is more difficult and the production yield is gradually reduced due to the increasing density of pixel driving circuits on the array substrate of the organic light emitting display panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (8)

1. An organic light emitting display panel, comprising: the pixel units are distributed in an array mode, and at least part of the pixel units comprise first-type light-emitting devices and second-type light-emitting devices; wherein,

the second type of light-emitting device comprises the following components which are sequentially positioned on the substrate base plate: an anode, an organic light emitting layer over the anode, and a cathode over the organic light emitting layer; the first type of light-emitting device comprises a cathode, an organic light-emitting layer and an anode, wherein the cathode is positioned on the substrate, the organic light-emitting layer is positioned on the cathode, and the anode is positioned on the organic light-emitting layer;

in the same pixel unit, the cathode of each first-type light-emitting device and the anode of one-to-one corresponding second-type light-emitting device are connected to the same end of the same pixel driving circuit, and the anode of the first-type light-emitting device and the cathode of the second-type light-emitting device are connected to a first power supply end; or, in the same pixel unit, the anode of each first light emitting device and the cathode of one corresponding second light emitting device are connected to the same end of the same pixel driving circuit, and the cathode of the first light emitting device and the anode of the second light emitting device are connected to the first power terminal, so that the first light emitting device and the second light emitting device share the same pixel driving circuit and are driven by alternately changing voltages, and the first light emitting device and the second light emitting device alternately emit light;

the first type of light emitting device comprises one or two light emitting devices;

the first light-emitting device comprises a red light-emitting device, the second light-emitting device comprises a green light-emitting device and a blue light-emitting device, and the first light-emitting device and the second light-emitting device emit light at the same side;

alternatively, the first type of light emitting device includes a green light emitting device, and the second type of light emitting device includes a red light emitting device and a blue light emitting device;

alternatively, the first type of light emitting device includes a blue light emitting device, and the second type of light emitting device includes a red light emitting device and a green light emitting device;

alternatively, the first type of light emitting device includes a white light emitting device, and the second type of light emitting device includes a red light emitting device, a green light emitting device, and a blue light emitting device.

2. The organic light emitting display panel of claim 1,

the first type light-emitting device and/or the second type light-emitting device are further provided with one or more of the following film layers between the cathode and the organic light-emitting layer:

the organic light emitting diode comprises an electron injection layer, an electron transport layer and a hole blocking layer, wherein the electron transport layer is positioned on one side, close to the organic light emitting layer, of the electron injection layer, and the hole blocking layer is positioned on one side, close to the organic light emitting layer, of the electron transport layer;

the first type light emitting device and/or the second type light emitting device are further provided with one or more of the following film layers between the anode and the organic light emitting layer:

the organic light emitting diode comprises a hole injection layer, a hole transport layer and an electron blocking layer, wherein the hole transport layer is located on one side, close to the organic light emitting layer, of the hole injection layer, and the electron blocking layer is located on one side, close to the organic light emitting layer, of the hole transport layer.

3. The organic light emitting display panel of claim 1, wherein the pixel driving circuit comprises a first control module, a memory module, a second control module, wherein,

the first control module is respectively connected with the scanning signal end, the data signal end and the first node; the first control module is used for providing the signal of the data signal terminal to the first node under the control of the signal of the scanning signal terminal;

the storage module is respectively connected with the first node and a second power supply end; the storage module is used for charging or discharging under the control of the signal of the first node and the signal of the second power supply end;

the second control module is respectively connected with the first node, the second power end, the cathode of the first type light-emitting device and the anode of the second type light-emitting device; or, the second control module is respectively connected to the first node, the second power end, the anode of the first light emitting device, and the cathode of the second light emitting device; the second control module is used for controlling the first type light-emitting device and the second type light-emitting device to alternately emit light under the control of the signal of the first node and the signal of the second power supply end.

4. The organic light emitting display panel of claim 3, wherein the first control module comprises a first transistor; wherein,

the control electrode of the first transistor is connected with the scanning signal end, the first electrode of the first transistor is connected with the data signal end, and the second electrode of the first transistor is connected with the first node.

5. The organic light emitting display panel according to claim 3, wherein the memory module comprises: a capacitor; wherein,

the capacitor is connected between the first node and the second power supply terminal.

6. The organic light emitting display panel according to claim 3, wherein the second control unit comprises: a second transistor; wherein,

a control electrode of the second transistor is connected to the first node, a first electrode of the second transistor is connected to the second power source terminal, a second electrode of the second transistor is connected to the cathode of the first type light emitting device and the anode of the second type light emitting device, or a second electrode of the second transistor is connected to the anode of the first type light emitting device and the cathode of the second type light emitting device.

7. A driving method of driving the organic light emitting display panel according to any one of claims 1 to 6, comprising:

providing the organic light-emitting display panel;

and inputting alternating voltage to a pixel driving circuit connected with a first type light-emitting device and a second type light-emitting device so as to enable the first type light-emitting device and the second type light-emitting device to alternately emit light.

8. The driving method according to claim 7, wherein the inputting of the alternately changing voltage to the pixel driving circuit to which the first type light emitting device and the second type light emitting device are connected, comprises:

and inputting a voltage which changes alternately to a second power supply end of the pixel driving circuit connected with the first light-emitting device and the second light-emitting device, and controlling the frequency and the voltage value of the input voltage so as to control the light color of the mixed first light-emitting device and second light-emitting device.

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