CN116434703A

CN116434703A - Pixel driving circuit, compensation method thereof and display panel

Info

Publication number: CN116434703A
Application number: CN202310477575.1A
Authority: CN
Inventors: 周满城; 叶利丹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-07-14

Abstract

The application discloses a pixel drive circuit and compensation method, display panel thereof, pixel drive circuit includes: the device comprises an identification circuit, a storage circuit, a data input circuit, a drive control circuit and a light-emitting circuit; the light-emitting circuit comprises a first light-emitting unit, a second light-emitting unit and a switching circuit, wherein the cathode end of the first light-emitting unit is connected with the anode end of the second light-emitting unit, and the anode end of the first light-emitting unit is connected with the cathode end of the second light-emitting unit; when the switching control signal is in a first state, the first light-emitting unit is controlled to emit light, and the second light-emitting unit does not emit light; when the switching control signal is in the second state, the second light-emitting unit is controlled to emit light, and the first light-emitting unit does not emit light. According to the method and the device, the pixels with RGB arrangement sequences can be selected to emit light or the pixels with GBR arrangement sequences can be selected to emit light according to different pictures, so that the display effect of the display panel is improved.

Description

Pixel driving circuit, compensation method thereof and display panel

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a compensation method thereof, and a display panel.

Background

OLED (Organic Light-Emitting Diode) displays have many advantages of thin body, power saving, bright color, strong image quality and the like, and are widely applied. Such as OLED televisions, mobile phones, notebook computers, etc., are increasingly dominant in the field of flat panel displays. In the OLED display panel, pixels are arranged in a matrix form including a plurality of rows and a plurality of columns, and the earliest pixel design adopts a pixel circuit which is generally formed by two transistors (T) and one capacitor (C), and is also called a 2T1C pixel circuit. Typically, a 2T1C driving circuit is disposed corresponding to a light emitting unit (LED), so that a pixel driving circuit is matched with an LED to form a sub-pixel. In general, for example, an RGB display panel, in which one pixel is constituted by three sub-pixels of RGB.

In general, the arrangement order of RGB is generally fixed, for example, the arrangement order of sub-pixels of a display panel is RGB, and after the display panel is shipped, the order of RGB cannot be changed to BGR, so that for some applications or some display frames, the sequential display effect of RGB is better, and the sequential display effect of other sure BGR is better. For this reason, a technical solution for solving the above problems is needed by those skilled in the art.

Disclosure of Invention

The present invention provides a pixel driving circuit, a compensation method thereof, and a display panel, which can select pixel light emission of RGB arrangement order or pixel light emission of GBR arrangement order according to different images, so as to improve display effect of the display panel.

The application discloses a pixel drive circuit includes: the device comprises an identification circuit, a storage circuit, a data input circuit, a drive control circuit and a light-emitting circuit; the identification circuit is used for identifying the data signal and outputting a switching control signal according to the data signal; the storage circuit is connected to the first node and used for storing the voltage of the first node; the data input circuit is connected to the first node, and is connected with a scanning signal and a data signal, and the data signal is transmitted to the first node under the control of the scanning signal; the driving control circuit is connected with the first node and the second node and is connected with a power signal, and the driving control circuit is used for transmitting the power signal to the light-emitting circuit through the second node under the control of the first node; the light-emitting circuit is used for receiving the power supply signal to emit light under the control of the drive control circuit; the light-emitting circuit comprises a first light-emitting unit, a second light-emitting unit and a switching circuit, wherein the cathode end of the first light-emitting unit is connected with the anode end of the second light-emitting unit, and the anode end of the first light-emitting unit is connected with the cathode end of the second light-emitting unit; the switching circuit is used for receiving the switching control signal and is respectively connected with the cathode terminal of the first light-emitting unit, the anode terminal of the second light-emitting unit, the grounding terminal voltage signal and the second node; when the switched control signal is in a first state, the first light-emitting unit is controlled to emit light, and the second light-emitting unit is not controlled to emit light; when the switching control signal is in a second state, the second light-emitting unit is controlled to emit light, and the first light-emitting unit does not emit light.

Optionally, the switching circuit includes a first active switch, a second active switch, a third active switch and a fourth active switch; one end of the first active switch is connected with the anode end of the first light-emitting unit, and the other end of the first active switch is connected to the second node; one end of the second active switch is connected with the cathode end of the first light-emitting unit, and the other end of the second active switch is connected to a second node; one end of the third active switch is connected with the anode end of the first light-emitting unit, and the other end of the third active switch is connected with a grounding end voltage signal; one end of the fourth active switch is connected with the cathode end of the first light-emitting unit, and the other end of the fourth active switch is connected with a grounding end voltage signal; the switching circuit is used for receiving the switching control signal, and when the switching control signal is in a first state, the first active switch and the fourth active switch are conducted to control the first light-emitting unit to emit light, and the second light-emitting unit does not emit light; when the switching control signal is in a second state, the second active switch and the third active switch are conducted to control the second light-emitting unit to emit light, and the first light-emitting unit does not emit light; the first light emitting unit comprises a red light emitting unit, a green light emitting unit or a blue light emitting unit; the second light emitting unit comprises a red light emitting unit, a green light emitting unit or a blue light emitting unit; in the pixel driving circuit, the arrangement order of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the first light emitting units is different from the arrangement order of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the second light emitting units in the row direction.

Optionally, in the pixel driving circuit, in a row direction, the plurality of first light emitting units are arranged in an order of red light emitting units, green light emitting units, and blue light emitting units, and the plurality of first light emitting units are arranged in an order of blue light emitting units, green light emitting units, and red light emitting units.

Optionally, the identifying unit identifies an arrangement sequence of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal, and outputs the switching control signal according to the arrangement sequence of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal; when the arrangement sequence of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal is consistent with the arrangement sequence of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the first light emitting unit, the switching control signal is in a first state; the switching control signal is in a second state when the arrangement order of the red pixel signal, the green pixel signal, and the blue pixel signal in the data signal is identical to the arrangement order of the red light emitting unit, the green light emitting unit, and the blue light emitting unit in the first light emitting unit.

Optionally, the storage circuit includes a first capacitor, one end of the first capacitor is connected to a power supply voltage, and the other end of the first capacitor is connected to the first node; the drive control circuit comprises a fifth active switch, a sixth active switch and a seventh active switch; one end of the fifth active switch is connected to the power supply voltage, and the other end of the fifth active switch is connected to a third node; the input end of the sixth active switch is connected to the third node, the control end of the sixth active switch is connected to the first node, and the output end of the sixth active switch is connected to the second node; one end of the seventh active switch is connected with the first node, and the other end of the seventh active switch is connected with the second node; the data input circuit comprises an eighth active switch, one end of the eighth active switch is connected with a data signal, and the other end of the eighth active switch is connected with the third node; the drive control circuit further comprises a ninth active switch, one end of the ninth active switch is connected with an initialization voltage signal, and the other end of the ninth active switch is connected to the second node.

Optionally, the switching control signal includes a first switching signal and a second switching signal; the control end of the first active switch and the control end of the fourth active switch are respectively connected with the first switching signal; the control end of the second active switch and the control end of the third active switch are respectively connected with the second switching signal; the control end of the fifth active switch is connected with a first enabling signal; the control end of the seventh active switch and the control end of the eighth active switch are respectively connected with a current line scanning signal; and the control end of the ninth active switch is connected with the scanning signal of the last row.

Optionally, the first active switch, the second active switch, the third active switch, the fourth active switch, the fifth active switch, the sixth active switch, the seventh active switch, the eighth active switch and the ninth active switch are P-type low-temperature polysilicon thin film transistors or P-type oxide thin film transistors or P-type amorphous silicon thin film transistors respectively.

Optionally, the timing of the pixel driving circuit includes: a reset phase, a data input phase and a light emitting phase; in the reset stage, the first active switch, the second active switch, the third active switch, the fourth active switch and the ninth active switch are turned on; in the data input stage, the sixth active switch, the seventh active switch and the eighth active switch are turned on; in the lighting stage, the fifth active switch is turned on; when the switching control signal is in a first state, the first switching signal is in a low level, the first active switch and the fourth active switch are conducted, and the first light-emitting unit emits light; when the switching control signal is in a second state, the second switching signal is in a low level, the second active switch and the third active switch are conducted, and the second light emitting unit emits light.

The application also discloses a display panel, which comprises the pixel driving circuit.

The application also discloses a compensation method of the pixel driving circuit, wherein the pixel driving circuit uses the pixel driving circuit, and the compensation method comprises the following steps:

identifying a data signal and outputting a switching control signal according to the data signal;

when the switching control signal is in a first state, the first active switch and the fourth active switch are conducted, the first light-emitting unit emits light, and the second light-emitting unit does not emit light;

when the switching control signal is in a second state, the second active switch and the third active switch are conducted, the second light-emitting unit emits light, and the first light-emitting unit does not emit light.

According to the pixel driving circuit, the identification circuit is arranged, and after the identification circuit identifies and distinguishes input data, the first light-emitting unit or the second light-emitting unit in the pixel driving circuit is controlled to be on. On the basis that two different light emitting units are arranged on one pixel driving circuit, the pixel driving circuit drives a plurality of LEDs, and then the effect of displaying by different RGB pixel arrangements is achieved. Therefore, the display device and the display method are realized on the same display panel, and can display in the RGB pixel arrangement sequence and in the pixel arrangement sequence of BGR, GBR, RBG, BRG, GRB and the like. Through the mode of driving two light emitting units by means of a pixel driving circuit, not only is the use of components saved, but also the display panel can display in various pixel arrangement modes, and the applicability of the display panel is better improved.

Compared with another technical conception of the inventor, the design of the switching circuit in the application, in the first aspect, the first light-emitting unit and the second light-emitting unit cannot emit light at the same time, so that when one light-emitting unit emits light, the other light-emitting unit is prevented from being triggered to emit light by mistake. The anode end and the cathode end between the first light-emitting unit and the second light-emitting unit are interconnected, namely the cathode end of the first light-emitting unit is connected with the anode end of the second light-emitting unit, and the anode end of the first light-emitting unit is connected with the cathode end of the second light-emitting unit; when the anode end of the first light-emitting unit is connected with a positive voltage, the cathode end of the second light-emitting unit is connected with the positive voltage synchronously, and the cathode end of the second light-emitting unit does not emit light after the positive voltage is connected with the cathode end of the second light-emitting unit due to the unidirectional conduction performance of the LED. In the second aspect, no additional setting signal is needed to control the second light-emitting unit to emit no light, and only the first light-emitting unit and the second light-emitting unit emit light independently through the switching circuit, so that the circuit design and the cost are saved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. In the drawings:

FIG. 1 is a schematic diagram of a pixel driving circuit of the present application;

FIG. 2 is a schematic diagram of an identification circuit of the present application;

FIG. 3a is a schematic circuit diagram of the pixel driving circuit of the present application during a reset phase;

FIG. 3b is a schematic circuit diagram of the pixel driving circuit of the present application during a data input stage;

FIG. 3c is a schematic circuit diagram of a pixel driving circuit according to the present application in which the first light emitting unit emits light during the light emitting phase;

FIG. 3d is a schematic diagram of a pixel driving circuit of the present application in which the second light emitting unit emits light during the light emitting phase;

FIG. 4a is a timing diagram of a first light emitting unit of the present application;

FIG. 4b is a timing diagram of a second light emitting unit of the present application;

FIG. 5 is a schematic diagram of a plurality of pixel drive circuits of the present application;

FIG. 6 is a schematic diagram of a display panel of the present application;

fig. 7 is a schematic diagram illustrating steps of a compensation method of a pixel driving circuit according to the present application.

10, a display panel; 100. a pixel driving circuit; 110. an identification circuit; 120. a memory circuit; 130. a data input circuit; 140. a drive control circuit; 150. a light emitting circuit; 151. a first light emitting unit; 152. a second light emitting unit; 160. a switching circuit; t1, a first active switch; t2, a second active switch; t3, a third active switch; t4, a fourth active switch; t5, a fifth active switch; t6, sixth active switch; t7, a seventh active switch; t8, eighth active switch; t9, a ninth active switch; c1, a first capacitor; G. a first node; D. a second node; s, a third node; ELVDD, supply voltage; ELVSS, ground voltage; VINT1, first initialization voltage.

Detailed Description

It should be understood that the terminology, specific structural and functional details disclosed herein are merely representative for purposes of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. In addition, terms of the azimuth or positional relationship indicated by "upper", "lower", "left", "right", "vertical", "horizontal", etc., are described based on the azimuth or relative positional relationship shown in the drawings, and are merely for convenience of description of the present application, and do not indicate that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The present application is described in detail below with reference to the attached drawings and alternative embodiments.

Embodiment one:

fig. 1 is a schematic diagram of a pixel driving circuit of the present application, fig. 2 is a schematic diagram of an identification circuit of the present application, and referring to fig. 1-2, a pixel driving circuit 100 is disclosed, comprising: an identification circuit 110, a storage circuit 120, a data input circuit 130, a drive control circuit 140, and a light emitting circuit 150.

The identification circuit 110 is configured to identify a data signal, and output a switching control signal according to the data signal; the storage circuit 120 is connected to the first node G, and is configured to store a voltage of the first node G; the data input circuit 130 is connected to the first node G, and the data input circuit 130 is connected to a scan signal and a data signal, and transmits the data signal to the first node G under the control of the scan signal; the driving control circuit 140 is connected to the first node G and the second node D, and is connected to a power signal, and configured to transmit the power signal to the light emitting circuit 150 through the second node D under the control of the first node G; the light emitting circuit 150 is configured to receive the power signal to emit light under the control of the driving control circuit 140; the light emitting circuit 150 includes a first light emitting unit 151, a second light emitting unit 152, and a switching circuit 160, wherein a cathode terminal of the first light emitting unit 151 is connected to an anode terminal of the second light emitting unit 152, and an anode terminal of the first light emitting unit 151 is connected to a cathode terminal of the second light emitting unit 152; the switching circuit is used for receiving the switching control signal and is respectively connected with the cathode terminal of the first light-emitting unit, the anode terminal of the second light-emitting unit, the grounding terminal voltage signal and the second node; when the switched control signal is in a first state, the first light-emitting unit is controlled to emit light, and the second light-emitting unit is not controlled to emit light; when the switching control signal is in a second state, the second light-emitting unit is controlled to emit light, and the first light-emitting unit does not emit light.

In the present application, the identification circuit 110 is provided, and after the identification circuit 110 identifies and distinguishes the input data, the first light emitting unit 151 or the second light emitting unit 152 in the pixel driving circuit 100 is controlled to be on. On the basis that two different light emitting units are arranged on one pixel driving circuit 100, the effect that one pixel driving circuit 100 drives a plurality of LEDs and then displays by using different RGB pixel arrangements is achieved. Therefore, the display device and the display method are realized on the same display panel, and can display in the RGB pixel arrangement sequence and in the pixel arrangement sequence of BGR, GBR, RBG, BRG, GRB and the like. By driving the two light emitting units by means of the pixel driving circuit 100, not only is the use of components saved, but also the display panel can display in various pixel arrangement modes, and the applicability of the display panel is improved better.

Specifically, the switching circuit 160 includes a first active switch T1, a second active switch T2, a third active switch T3, and a fourth active switch T4; one end of the first active switch T1 is connected to the anode end of the first light emitting unit 151, and the other end of the first active switch T1 is connected to the second node D; one end of the second active switch T2 is connected to the cathode end of the first light emitting unit 151, and the other end of the second active switch T2 is connected to the second node D; one end of the third active switch T3 is connected to the anode end of the first light emitting unit 151, and the other end of the third active switch T3 is connected to a voltage signal of the ground terminal; one end of the fourth active switch T4 is connected to the cathode end of the first light emitting unit 151, and the other end of the fourth active switch T4 is connected to a ground voltage signal; the switching circuit 160 is configured to receive the switching control signal, and when the switching control signal is in a first state, the first active switch T1 and the fourth active switch T4 are turned on to control the first light emitting unit 151 to emit light, and the second light emitting unit 152 to emit no light; when the switching control signal is in the second state, the second active switch T2 and the third active switch T3 are turned on, so as to control the second light emitting unit 152 to emit light, and the first light emitting unit 151 does not emit light. The ground terminal voltage is ELVSS voltage, and the power supply signal is ELVDD voltage.

With respect to another technical concept of the present inventor, in the design of the switching circuit 160 in the present application, in the first aspect, the first light emitting unit 151 and the second light emitting unit 152 cannot emit light at the same time, so that when one light emitting unit emits light, the other light emitting unit is prevented from being triggered to emit light by mistake. Wherein, anode terminals and cathode terminals between the first light emitting unit 151 and the second light emitting unit 152 are utilized to interconnect, that is, the cathode terminal of the first light emitting unit 151 is connected with the anode terminal of the second light emitting unit 152, and the anode terminal of the first light emitting unit 151 is connected with the cathode terminal of the second light emitting unit 152; when the anode terminal of the first light emitting unit 151 is connected to the positive voltage, the cathode terminal of the second light emitting unit 152 is connected to the positive voltage synchronously, and the cathode terminal of the second light emitting unit 152 does not emit light after being connected to the positive voltage due to the unidirectional conduction performance of the LED. In the second aspect, no additional setting signal is required to control the second light emitting unit 152 not to emit light, and only the switching circuit 160 is used to realize that the first light emitting unit 151 and the second light emitting unit 152 emit light only individually, thereby saving circuit design and cost.

Specifically, the identifying circuit 110 is configured to identify a data signal, and output a switching control signal according to the data signal. In this embodiment, the recognition circuit 110 recognizes that the input data signal, for example, a picture to be displayed is photographed, or some applications, or some screens are generally suggested to be displayed in RGB arrangement order, and outputs a switching control signal, and selects to display in RGB pixel arrangement order according to the switching control signal, for example, when the picture to be displayed is a BGR format picture, or when an OpenCV or other tool processes an image in BGR format, outputs the switching control signal, and selects to display in BGR pixel arrangement order according to the switching control signal.

It is understood that the first light emitting unit 151 and the second light emitting unit 152 of the present application have only three states, and the first state is that the first light emitting unit 151 emits light and the second light emitting unit 152 does not emit light. The second state is that the second light emitting unit 152 and the first light emitting unit 151 do not emit light. The third state is that the first light emitting unit 151 and the second light emitting unit 152 emit no light at the same time.

In this embodiment, if two or more schemes of pixel arrangement order are to be implemented, two light emitting units are grouped together, and the number of light emitting units needs to be increased in groups. For example, a group of light emitting units, namely a third light emitting unit and a fourth light emitting unit, are added, the cathode end of the third light emitting unit is connected with the anode end of the fourth light emitting unit, and the anode end of the third light emitting unit is connected with the cathode end of the fourth light emitting unit. Thereby realizing the independent light emission of the third light emitting unit and the fourth light emitting unit. In the present embodiment, four light emitting units are mounted in one pixel driving circuit 100, and respective driving in four pixel arrangements can be realized.

Specifically, the first light emitting unit 151 includes a red light emitting unit, a green light emitting unit, or a blue light emitting unit; the second light emitting unit 152 includes a red light emitting unit, a green light emitting unit, or a blue light emitting unit; in the pixel driving circuit 100, the arrangement order of the red light emitting unit, the green light emitting unit, and the blue light emitting unit in the first light emitting unit 151 is different from the arrangement order of the red light emitting unit, the green light emitting unit, and the blue light emitting unit in the second light emitting unit 152.

It should be understood that, in the above-mentioned row of the plurality of pixel driving circuits 100, namely, a row of the sub-pixel units, each sub-pixel may be a red sub-pixel R or a green sub-pixel G or a blue sub-pixel B, and each sub-pixel is correspondingly provided with one pixel driving circuit 100. The red light emitting unit corresponds to a red sub-pixel R, the green light emitting unit corresponds to a green sub-pixel G, and the blue light emitting unit corresponds to a blue sub-pixel B.

In this embodiment, the plurality of first light emitting units 151 form a first display pixel group, where the pixel arrangement manner of the first display pixel group may be RGB, RBG, GRB, GBR, BRG, BGR or the like. The plurality of second light emitting units 152 are formed of a second display pixel group, wherein the pixel arrangement of the second display pixel group may be RGB, RBG, GRB, GBR, BRG, BGR. However, the pixel arrangement modes of the first display pixel group and the second display pixel group are different, so that different pixel arrangement display modes are realized.

For example: in the pixel driving circuit 100, the first light emitting units 151 are arranged in the order of red light emitting units, green light emitting units, and blue light emitting units, and the first light emitting units 151 are arranged in the order of blue light emitting units, green light emitting units, and red light emitting units; that is, in one row of pixels, the arrangement order of the plurality of first light emitting units 151 corresponds to the arrangement of the sub-pixels being RGB, and the arrangement order of the plurality of second light emitting units 152 corresponds to the arrangement of the sub-pixels being BGR. Thereby realizing that when the switching control signal is in the first state, the display is performed by RGB; and when the switching control signal is in the second state, displaying by BGR.

The specific identification process comprises the steps that the identification unit identifies the arrangement sequence of a red pixel signal, a green pixel signal and a blue pixel signal in the data signal, and outputs a switching control signal according to the arrangement sequence of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal; when the arrangement order of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal is consistent with the arrangement order of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the first light emitting unit 151, the switching control signal is in a first state; the switching control signal is in the second state when the arrangement order of the red pixel signal, the green pixel signal, and the blue pixel signal in the data signal is identical to the arrangement order of the red light emitting unit, the green light emitting unit, and the blue light emitting unit in the first light emitting unit 151.

The identification unit may be a timing controller, and the TCON is mainly used for receiving the data source signal, and controlling the gate driving chip and the source driving chip after processing, so as to drive the liquid crystal screen to display an image. The RGB arrangement sequence in the data signal is directly recognized by the timing controller.

In a special picture, for example, in a stitched image, there may be a case where the partition data formats are different, the pixel arrangement order of the data signals in the upper half of the display picture is RGB, and the pixel arrangement order of the data signals in the lower half is BGR. With the display panel of the present embodiment, it is possible to realize that the upper half screen selects the first light emitting units 151 arranged in RGB for display and the lower half screen selects the second light emitting units 152 arranged in BGR for display. In this embodiment, two images with different pixel arrangements can be displayed on one screen at the same time.

In another recognition mode, the recognition unit may recognize, in addition to the data source, a program or an application running on the current display panel, and in some applications, select to display in the pixel arrangement order of RGB. While in other applications, the selection is displayed in the order of the pixel arrangement of BGR. In the present embodiment, only two pixel arrangement sequences of RGB and BGR are listed, and other pixel arrangement sequences are equally applicable.

Specifically, the application describes the 7T1C pixel driving circuit 100 as an example, the storage circuit 120 includes a first capacitor C1, one end of the first capacitor C1 is connected to a power supply voltage, and the other end of the first capacitor C1 is connected to the first node G; the driving control circuit 140 includes a fifth active switch T5, a sixth active switch T6, and a seventh active switch T7; one end of the fifth active switch T5 is connected to the power supply voltage, and the other end of the fifth active switch T5 is connected to the third node S; the input end of the sixth active switch T6 is connected to the third node S, the control end of the sixth active switch T6 is connected to the first node G, and the output end of the sixth active switch T6 is connected to the second node D; one end of the seventh active switch T7 is connected to the first node G, and the other end of the seventh active switch T7 is connected to the second node D; the data input circuit 130 includes an eighth active switch T8, one end of the eighth active switch T8 is connected to a data signal, and the other end of the eighth active switch T8 is connected to the third node S; the driving control circuit 140 further includes a ninth active switch T9, one end of the ninth active switch T9 is connected to the initialization voltage signal, and the other end of the ninth active switch T9 is connected to the second node D.

The present embodiment adopts a 7T1C pixel driving circuit 100, and the light emitting circuit 150 of the present application can be practically applied to various pixel driving circuits 100 such as 2T1C, 8T1C, 5T2C, and the like. However, for the pixel driving circuit 100 in the present embodiment, a scheme of time-sharing light emission of the first light emitting unit 151 and the second light emitting unit 152 is most suitable.

It is understood that the first and second

light emitting units

151 and 152 of the present application do not lack the initialization voltages of the first and second

light emitting units

151 and 152 with respect to another aspect of the present application. In practice, when the first light emitting unit 151 emits light, the anode terminal of the second light emitting unit 152 is connected to the ground voltage signal, so as to complete the initialization process. That is, the first and second

light emitting units

151 and 152 in the embodiment of the present application do not need a process of exclusively switching in the initialization voltage, and the number of TFTs can be saved.

Specifically, the switching control signal includes a first switching signal and a second switching signal; the control end of the first active switch T1 and the control end of the fourth active switch T4 are respectively connected with the first switching signal; the control end of the second active switch T2 and the control end of the third active switch T3 are respectively connected with the second switching signal; the control end of the fifth active switch T5 is connected with a first enabling signal; the control end of the seventh active switch T7 and the control end of the eighth active switch T8 are respectively connected with current line scanning signals; the control end of the ninth active switch T9 is connected to the previous row of scanning signals.

In this embodiment, in the architecture of the 7T1C pixel driving circuit 100, only one control signal is added, and the control of other active switches is controlled by the current row scanning signal and the previous row scanning signal.

Specifically, the first active switch T1, the second active switch T2, the third active switch T3, the fourth active switch T4, the fifth active switch T5, the sixth active switch T6, the seventh active switch T7, the eighth active switch T8 and the ninth active switch T9 are P-type low-temperature polysilicon thin film transistors or P-type oxide thin film transistors or P-type amorphous silicon thin film transistors, respectively. In this embodiment, a P-type thin film transistor is taken as an example, and the same applies to an N-type thin film transistor.

Fig. 3a is a circuit schematic of the pixel driving circuit in the reset stage, fig. 3b is a circuit schematic of the pixel driving circuit in the data input stage, and fig. 3c is a circuit schematic of the pixel driving circuit in the light emitting stage, in which the first light emitting unit emits light; fig. 3d is a schematic circuit diagram of the pixel driving circuit of the present application, in which the second light emitting unit emits light during the light emitting stage. Fig. 4a is a timing diagram of a first light emitting unit of the present application, and fig. 4b is a timing diagram of a second light emitting unit of the present application.

Referring to fig. 3 a-3 d and fig. 4a-4b, in particular, the timing of the pixel driving circuit 100 includes: a reset phase, a data input phase and a light emitting phase;

in the reset stage, when the previous row of scanning signals are in a low level state, the first switching signals and the second switching signals are respectively in a low level state, and the first active switch T1, the second active switch T2, the third active switch T3, the fourth active switch T4 and the ninth active switch T9 are conducted; in the reset stage, the first active switch T1, the second active switch T2, the third active switch T3 and the fourth active switch T4 are all turned on, so that the second node D is connected to ELVSS, and meanwhile, the first node G is connected to the first initialization voltage VINT1, thereby realizing the reset of the first node G and the third node S.

In the data input stage, the current line scanning signal is at a low level, and the sixth active switch T6, the seventh active switch T7 and the eighth active switch T8 are turned on; the data signal charges the first capacitor C1 through the eighth active switch T8, the sixth active switch T6 and the seventh active switch T7. At this time, since the first, second, third and fourth active switches T1, T2, T3 and T4 are in the off state, neither the first and second

light emitting units

151 and 152 emit light.

Wherein, the last line scanning signal and the current line scanning signal are driven in a progressive scanning mode. The sixth active switch T6 in the pixel driving circuit 100 serves as a driving transistor in the pixel driving circuit 100.

In the light-emitting stage, the first enabling signal is in a low level, and the fifth active switch T5 is turned on; in this embodiment, two fifth active switches T5 may be provided and connected to the first switching signal and the second switching signal respectively, so as to be turned on respectively when needed, and further save input of the first enable signal.

When the switching control signal is in the first state, the first switching signal is at a low level, the first active switch T1 and the fourth active switch T4 are turned on, the second active switch T2 and the third active switch T3 are turned off, the first light emitting unit 151 emits light, and the second light emitting unit 152 does not emit light; when the switching control signal is in the second state, the second switching signal is at a low level, the second active switch T2 and the third active switch T3 are turned on, the first active switch T1 and the fourth active switch T4 are turned off, the second light emitting unit 152 emits light, and the first light emitting unit 151 does not emit light.

In the above, when the pixel driving circuits 100 are seen from one pixel driving circuit 100, SCAN (n-1) is the previous row scanning signal, SCAN (n) is the current row scanning signal, EM1 is the first switching signal, EM2 is the second switching signal, and EN1 is the first enabling signal, as shown in fig. 5.

Fig. 6 is a schematic diagram of a display panel of the present application, and referring to fig. 6, the present application also discloses a display panel 10, which includes the above-mentioned pixel driving circuit, and the pixel driving circuit may be the pixel driving circuit in any one of the embodiments of the present application.

Embodiment two:

fig. 7 is a schematic step diagram of a compensation method of a pixel driving circuit according to a second embodiment of the present application, and referring to fig. 7, the present application further discloses a compensation method of a pixel driving circuit, where the pixel driving circuit uses the pixel driving circuit, and the compensation method includes:

s100: identifying a data signal and outputting a switching control signal according to the data signal;

s200: when the switching control signal is in a first state, the first light-emitting unit emits light, and the second light-emitting unit does not emit light; the first active switch and the fourth active switch are turned on, and the second active switch and the third active switch are turned off;

S300: when the switching control signal is in a second state, the second light-emitting unit emits light, and the first light-emitting unit does not emit light; the second active switch and the third active switch are turned on, and the first active switch and the fourth active switch are turned off.

In this embodiment, the upper half of the screen may be displayed in the RGB pixel arrangement order, and the lower half of the screen may be displayed in the BGR pixel arrangement order.

According to the pixel driving circuit, the identification circuit is arranged, and after the identification circuit identifies and distinguishes input data, the first light-emitting unit or the second light-emitting unit in the pixel driving circuit is controlled to be on. On the basis that two different light emitting units are arranged on one pixel driving circuit, the pixel driving circuit drives a plurality of LEDs, and then the effect of displaying by different RGB pixel arrangements is achieved. Therefore, the display device and the display method are realized on the same display panel, and can display in the RGB pixel arrangement sequence and in the pixel arrangement sequence of BGR, GBR, RBG, BRG, GRB and the like. Through the mode of driving two light emitting units by means of a pixel driving circuit, the use of components is saved, the display panel can display in various pixel arrangement modes, and the applicability of the display panel is improved better.

It should be noted that, the inventive concept of the present application may form a very large number of embodiments, but the application documents have limited space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features may be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.

The foregoing is a further detailed description of the present application in connection with specific alternative embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.

Claims

1. A pixel driving circuit, comprising:

an identification circuit for identifying the data signal and outputting a switching control signal according to the data signal;

a storage circuit connected to a first node for storing a voltage of the first node;

the data input circuit is connected with the first node, is connected with a scanning signal and a data signal, and transmits the data signal to the first node under the control of the scanning signal;

The driving control circuit is connected with the first node and the second node and is connected with a power signal, and the driving control circuit is used for transmitting the power signal to the light-emitting circuit through the second node under the control of the first node; and

the light-emitting circuit is used for receiving the power supply signal to emit light under the control of the drive control circuit;

the light-emitting circuit comprises a first light-emitting unit, a second light-emitting unit and a switching circuit, wherein the cathode end of the first light-emitting unit is connected with the anode end of the second light-emitting unit, and the anode end of the first light-emitting unit is connected with the cathode end of the second light-emitting unit;

the switching circuit is used for receiving the switching control signal and is respectively connected with the cathode terminal of the first light-emitting unit, the anode terminal of the second light-emitting unit, the grounding terminal voltage signal and the second node;

when the switched control signal is in a first state, the first light-emitting unit is controlled to emit light, and the second light-emitting unit is not controlled to emit light; when the switching control signal is in a second state, the second light-emitting unit is controlled to emit light, and the first light-emitting unit does not emit light.

2. The pixel driving circuit according to claim 1, wherein the switching circuit includes a first active switch, a second active switch, a third active switch, and a fourth active switch;

One end of the first active switch is connected with the anode end of the first light-emitting unit, and the other end of the first active switch is connected to the second node; one end of the second active switch is connected with the cathode end of the first light-emitting unit, and the other end of the second active switch is connected to a second node;

one end of the third active switch is connected with the anode end of the first light-emitting unit, and the other end of the third active switch is connected with a grounding end voltage signal; one end of the fourth active switch is connected with the cathode end of the first light-emitting unit, and the other end of the fourth active switch is connected with a grounding end voltage signal;

the switching circuit is used for receiving the switching control signal, and when the switching control signal is in a first state, the first active switch and the fourth active switch are conducted to control the first light-emitting unit to emit light, and the second light-emitting unit does not emit light; when the switching control signal is in a second state, the second active switch and the third active switch are conducted to control the second light-emitting unit to emit light, and the first light-emitting unit does not emit light;

the first light emitting unit comprises a red light emitting unit, a green light emitting unit or a blue light emitting unit; the second light emitting unit comprises a red light emitting unit, a green light emitting unit or a blue light emitting unit;

In the pixel driving circuit, the arrangement order of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the first light emitting units is different from the arrangement order of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the second light emitting units in the row direction.

3. The pixel driving circuit according to claim 2, wherein in a row of the plurality of pixel driving circuits, the plurality of first light emitting units are arranged in an order of red light emitting units, green light emitting units, and blue light emitting units, and the plurality of first light emitting units are arranged in an order of blue light emitting units, green light emitting units, and red light emitting units, in a row direction.

4. The pixel driving circuit according to claim 2, wherein the identification unit identifies an arrangement order of the red pixel signal, the green pixel signal, and the blue pixel signal in the data signal, and outputs the switching control signal according to the arrangement order of the red pixel signal, the green pixel signal, and the blue pixel signal in the data signal;

when the arrangement sequence of the red pixel signal, the green pixel signal and the blue pixel signal in the data signal is consistent with the arrangement sequence of the red light emitting unit, the green light emitting unit and the blue light emitting unit in the first light emitting unit, the switching control signal is in a first state;

The switching control signal is in a second state when the arrangement order of the red pixel signal, the green pixel signal, and the blue pixel signal in the data signal is identical to the arrangement order of the red light emitting unit, the green light emitting unit, and the blue light emitting unit in the first light emitting unit.

5. The pixel driving circuit according to claim 2, wherein the storage circuit includes a first capacitor, one end of the first capacitor is connected to a power supply voltage, and the other end of the first capacitor is connected to the first node;

the drive control circuit comprises a fifth active switch, a sixth active switch and a seventh active switch;

one end of the fifth active switch is connected to the power supply voltage, and the other end of the fifth active switch is connected to a third node;

the input end of the sixth active switch is connected to the third node, the control end of the sixth active switch is connected to the first node, and the output end of the sixth active switch is connected to the second node;

one end of the seventh active switch is connected with the first node, and the other end of the seventh active switch is connected with the second node;

the data input circuit comprises an eighth active switch, one end of the eighth active switch is connected with a data signal, and the other end of the eighth active switch is connected with the third node;

The drive control circuit further comprises a ninth active switch, one end of the ninth active switch is connected with an initialization voltage signal, and the other end of the ninth active switch is connected to the second node.

6. The pixel driving circuit according to claim 5, wherein the switching control signal includes a first switching signal and a second switching signal;

the control end of the first active switch and the control end of the fourth active switch are respectively connected with the first switching signal; the control end of the second active switch and the control end of the third active switch are respectively connected with the second switching signal;

the control end of the fifth active switch is connected with a first enabling signal;

the control end of the seventh active switch and the control end of the eighth active switch are respectively connected with a current line scanning signal;

and the control end of the ninth active switch is connected with the scanning signal of the last row.

7. The pixel driving circuit according to claim 6, wherein the first active switch, the second active switch, the third active switch, the fourth active switch, the fifth active switch, the sixth active switch, the seventh active switch, the eighth active switch, and the ninth active switch are P-type low temperature polysilicon thin film transistors or P-type oxide thin film transistors or P-type amorphous silicon thin film transistors, respectively.

8. The pixel driving circuit according to claim 7, wherein the timing of the pixel driving circuit comprises: a reset phase, a data input phase and a light emitting phase;

in the reset stage, the first active switch, the second active switch, the third active switch, the fourth active switch and the ninth active switch are turned on;

in the data input stage, the sixth active switch, the seventh active switch and the eighth active switch are turned on;

in the lighting stage, the fifth active switch is turned on; when the switching control signal is in a first state, the first switching signal is in a low level, the first active switch and the fourth active switch are conducted, and the first light-emitting unit emits light; when the switching control signal is in a second state, the second switching signal is in a low level, the second active switch and the third active switch are conducted, and the second light emitting unit emits light.

9. A display panel comprising a pixel driving circuit according to any one of claims 1-8.

10. A method of compensating a pixel driving circuit using the pixel driving circuit according to any one of claims 1 to 8, the method comprising:

when the switching control signal is in a first state, the first light-emitting unit emits light, and the second light-emitting unit does not emit light;

when the switching control signal is in a second state, the second light emitting unit emits light, and the first light emitting unit does not emit light.