Pixel driving circuit of display panel and repairing and debugging method thereof

Abstract

The invention discloses a pixel driving circuit of a display panel, a pixel driving circuit of a repaired display panel and a repairing and debugging method of the display panel, and the pixel driving circuit comprises a data input module, a first storage module, a reset module, a first active switch, a light-emitting control module and a light-emitting unit. The light-emitting control module comprises a second active switch, a third active switch and a fourth active switch, the input end of the fourth active switch is connected with a first light-emitting control signal, the control end of the fourth active switch is connected with a second light-emitting control signal, and the output end of the fourth active switch is connected with the third node. And the third node is also preset with a repair control port. By presetting a repair control port and a fourth active switch, the problem of uneven brightness of pixel display after repair is solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a pixel driving circuit of a display panel, a repaired pixel driving circuit of a display panel, and a repair and debugging method for a display panel. Background Art

[0002] During the production process of display panels, the data lines of the display panels may be broken due to various reasons, which may cause some pixels to fail to display normally and need to be scrapped, resulting in a large cost burden. The current mainstream technology is to use a repair process, such as using a repair line to connect the broken data lines so that the pixels that cannot display normally can be displayed again.

[0003] However, since the transmission path of the repaired data signal becomes longer, the RC load increases, and the repaired pixel may become darker overall, thereby affecting the display effect. To this end, those skilled in the art are in urgent need of a technical solution that can solve the above problem. Summary of the invention

[0004] The purpose of the present application is to provide a pixel driving circuit of a display panel, a pixel driving circuit of a repaired display panel, and a repair and debugging method for a display panel. By presetting a repair control port and a fourth active switch, a separate operation of the light emitting control of the pixel driving circuit of the repaired pixel area is realized, thereby solving the attenuation problem of the data signal caused by the repair line, so that the problem of uneven brightness will not occur in the repaired pixel area.

[0005] The present application discloses a pixel driving circuit for a display panel. The display panel includes a plurality of pixel regions, and a pixel driving circuit is disposed in each pixel region. The pixel driving circuit includes a data input module, a first storage module, a reset module, a first active switch, a light emission control module, and a light emitting unit. The data input module is configured to obtain a data signal from a data line and input the data signal to the first active switch. The control end of the first active switch is connected to a first node, and the output end of the first active switch is connected to a second node. The first storage module is connected to the first node. The reset module is configured to reset the potential of the first node and the potential of the anodic end of the light emitting unit. Wherein, the light emission control module includes a second active switch, a third active switch, and a fourth active switch. The input end of the second active switch is connected to a power signal, the output end of the second active switch is connected to the input end of the first active switch, and the control end of the second active switch is connected to a third node. The input end of the third active switch is connected to the second node, the control end of the third active switch is connected to the third node, and the output end of the third active switch is connected to the anodic end of the light emitting unit. The input end of the fourth active switch receives a first light emission control signal, the control end of the fourth active switch receives a second light emission control signal, the output end of the fourth active switch is connected to the third node, and a repair control port is further preset at the third node.

[0006] Optionally, the light emission control module further includes a fifth active switch. The input end of the fifth active switch is connected to the second node, the output end of the fifth active switch is connected to the anodic end of the light emitting unit, and the control end of the fifth active switch is connected to the third node.

[0007] Optionally, the reset module includes a sixth active switch and a seventh active switch. The input end of the sixth active switch is connected to a reset signal, the output end of the sixth active switch is connected to the first node, the input end of the seventh active switch is connected to the reset signal, the output end of the seventh active switch is connected to the anodic end of the light emitting unit, and the control ends of the sixth active switch and the seventh active switch are connected to a first control signal. The first storage module includes a first capacitor. One end of the first capacitor is connected to the power signal, and the other end of the first capacitor is connected to the first node. The data input module includes an eighth active switch and a ninth active switch. The input end of the eighth active switch is connected to a data line, the control end of the eighth active switch is connected to a second control signal, and the output end of the eighth active switch is connected to the input end of the first active switch. The input end of the ninth active switch is connected to the second node, the output end of the ninth active switch is connected to the first node, and the control end of the ninth active switch is connected to the second control signal.

[0008] The present application also discloses a pixel driving circuit of a repaired display panel. The display panel includes a plurality of pixel regions, and a pixel driving circuit is disposed in each pixel region. The pixel driving circuit includes a data input module, a first storage module, a reset module, a first active switch, a light emission control module, and a light emitting unit. The data input module is configured to obtain a data signal from a data line and input the data signal to the first active switch. The control end of the first active switch is connected to a first node, and the output end of the first active switch is connected to a second node. The first storage module is connected to the first node. The reset module is configured to reset the potential of the first node and the potential of the anodic end of the light emitting unit. Wherein, the light emission control module includes a second active switch, a third active switch, and a fourth active switch. The input end of the second active switch is connected to a power signal, the output end of the second active switch is connected to the input end of the first active switch, and the control end of the second active switch is connected to a third node. The input end of the third active switch is connected to the second node, the control end of the third active switch is connected to the third node, and the output end of the third active switch is connected to the anodic end of the light emitting unit. The input end of the fourth active switch receives a first light emission control signal, the control end of the fourth active switch receives a second light emission control signal, the output end of the fourth active switch is connected to the third node, and a repair control port is further preset at the third node. The display panel further includes a data line and a repair line. The data line is configured to provide a data signal for the data input module. At least one first pixel repair region exists in the plurality of pixel regions. In the pixel driving circuit in the first pixel repair region, the repair line is configured to provide a data signal for the data input module of the pixel driving circuit. The repair control port is connected to a repair control signal, and the control end of the fourth active switch is disconnected from the second light emission control signal.

[0009] Optionally, the display panel further includes a detection module configured to detect the attenuation degree of the data signal in the first pixel repair region or the brightness difference of the light emitting unit, and control the duty cycle of the repair control signal according to the attenuation degree of the data signal or the brightness difference of the light emitting unit.

[0010] Optionally, in the pixel driving circuit in the pixel regions except the first pixel repair region, the first light emission control signal and the second light emission control signal control the light emission duration of the light emitting unit. In the pixel driving circuit in the first pixel repair region, the repair control signal controls the light emission duration of the light emitting unit. The duty cycle of the repair control signal is different from that of the first light emission control signal.

[0011] Optionally, the light-emitting control module further includes a fifth active switch. The input end of the fifth active switch is connected to the second node, the output end of the fifth active switch is connected to the anodic end of the light-emitting unit, and the control end of the fifth active switch is connected to the third node; the reset module includes a sixth active switch and a seventh active switch. The input end of the sixth active switch is connected to a reset signal, the output end of the sixth active switch is connected to the first node, the input end of the seventh active switch is connected to the reset signal, the output end of the seventh active switch is connected to the anodic end of the light-emitting unit, and the control ends of the sixth active switch and the seventh active switch are connected to a first control signal; the first storage module includes a first capacitor. One end of the first capacitor is connected to the power signal, and the other end of the first capacitor is connected to the first node; the data input module includes an eighth active switch and a ninth active switch. The input end of the eighth active switch is connected to a data line, the control end of the eighth active switch is connected to a second control signal, and the output end of the eighth active switch is connected to the input end of the first active switch; the input end of the ninth active switch is connected to the second node, the output end of the ninth active switch is connected to the first node, and the control end of the ninth active switch is connected to the second control signal.

[0012] Optionally, the pixel driving circuit includes a reset stage, a data writing compensation stage, and a light-emitting stage. In the reset stage, the sixth active switch and the seventh active switch are respectively turned on; in the data writing compensation stage, the first active switch, the eighth active switch, and the ninth active switch are respectively turned on; in the light-emitting stage, the first active switch, the second active switch, the third active switch, and the fifth active switch are respectively turned on, and the light-emitting unit emits light; when the pixel driving circuits in other pixel regions except the first pixel repair region are in the light-emitting stage, the first light-emitting control signal and the second light-emitting control signal control the second active switch, the third active switch, and the fifth active switch to be respectively turned on; when the pixel driving circuit in the first pixel repair region is in the light-emitting stage, the repair control signal controls the second active switch, the third active switch, and the fifth active switch to be respectively turned on.

[0013] The present application also discloses a repair and debugging method for a display panel. The pixel driving circuit of the display panel is as described above. The repair and debugging method includes the steps of:

[0014] When it is detected that the display panel has a broken line, a repair line is connected to the pixel driving circuit of the first pixel repair region, and the repair control signal is connected to a preset repair control port;

[0015] Detect the attenuation degree of the data signal in the first pixel repair area or the brightness of the light-emitting unit;

[0016] Control the duty cycle of the repair control signal according to the attenuation degree of the data signal or the brightness of the light-emitting unit;

[0017] Wherein, the repair control signal controls the light-emitting units in the first pixel repair area to emit light, and the light-emitting units in the first pixel repair area do not emit light before being connected to the repair line.

[0018] Optionally, in the step of connecting the repair line to the pixel driving circuit in the first pixel repair area and connecting the repair control signal to a preset repair control port when it is detected that there is a break point in the display panel, the steps include:

[0019] When it is detected that there is a disconnection in the display panel, determine the first pixel repair area;

[0020] In the first pixel repair area, disconnect the connection between the control end of the fourth active switch and the second light-emitting control signal;

[0021] Connect the repair line to the pixel driving circuit in the first pixel repair area and connect the repair control signal to a preset repair control port.

[0022] In this application, by reserving a fourth active switch and a repair control port in the light-emitting control module, when there is a pixel area that needs a repair line to provide a data signal, the fourth active switch in this pixel area is kept in the cut-off state, so that the first light-emitting control signal no longer controls the light-emitting units in this pixel area. By connecting the repair control port to the repair control signal, the light-emitting units are compensated by the repair control signal, thereby solving the attenuation problem of the data signal caused by the repair line, so that there will be no problem of uneven brightness in the repaired pixel area. By reserving the repair control port, this application realizes the separate operation of the light-emitting control of the pixel driving circuit in the repaired pixel area, that is, it is controlled by the repair control signal, which is different from the control method of using the first light-emitting control signal for the pixel area that does not need repair, and solves the problem that the repaired pixel is darker due to the attenuation of the data signal. Description of the Drawings

[0023] The included drawings are used to provide a further understanding of the embodiments of the present application, which form a part of the specification, are used to illustrate the implementation manners of the present application, and are used to explain the principles of the present application together with the text description. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0024] Figure 1 is a schematic diagram of the display panel of the present application;

[0025] Figure 2 is a schematic diagram of the pixel driving circuit of the display panel of the present application;

[0026] Figure 3 is a schematic diagram of the pixel driving circuit of another display panel of the present application;

[0027] Figure 4 is a timing schematic diagram of the pixel driving circuit before repair of the present application;

[0028] Figure 5 is a schematic diagram of the repaired display panel of the present application;

[0029] Figure 6 is a schematic diagram of the pixel driving circuit of the repaired display panel of the present application;

[0030] Figure 7 is a timing schematic diagram of the pixel driving circuit of the repaired display panel of the present application;

[0031] Figure 8 is a step schematic diagram of the repair and debugging method of the display panel of the present application.

[0032] Among them, 100, display panel; 101, pixel area; 102, first pixel repair area; 110, pixel driving circuit; 111, data input module; 112, first storage module; 113, reset module; 114, light emission control module; 115, light emitting unit; 120, repair line; 130, data line; 140, detection module; T1, first active switch; T2, second active switch; T3, third active switch; T4, fourth active switch; T5, fifth active switch; T6, sixth active switch; T7, seventh active switch; T8, eighth active switch; T9, ninth active switch; C1, first capacitor; S1, first control signal; S2, second control signal; Em1, first light emission control signal; Em2, second light emission control signal; Vdata, data signal; ELVDD, power signal; Vint, reset signal; Em_1, repair control signal; Em_2, repair control port. Detailed implementation manners

[0033] It should be understood that the terms, specific structures and functional details disclosed here are only for describing specific embodiments, which are representative, but the present application can be specifically implemented in many alternative forms and should not be construed as being limited only to the embodiments set forth herein.

[0034] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, unless otherwise specified, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; the meaning of "a plurality" is two or more. Additionally, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "vertical", "horizontal", etc. are described based on the orientation or relative positional relationship shown in the drawings, and are only for the convenience of simplifying the description of the present application, rather than indicating that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] The present application will be described in detail below with reference to the accompanying drawings and optional embodiments.

[0036] Figure 1 is a schematic diagram of the display panel of the present application. Refer to Figure 1 As shown, the present application discloses a display panel 100, which includes a plurality of pixel regions 101. Each pixel region 101 is provided with a pixel driving circuit 110, and the pixel driving circuit 110 is used to drive the pixels in the pixel region 101 to display. Generally, the display panel 100 is provided with a plurality of parallel data lines 130, and the pixel driving circuits 110 of the pixels in each column or each row of pixel regions 101 are connected to the same data line 130. When the data line 130 is broken at point C, the pixel driving circuits 110 in the pixel regions 101 on the BC segment will have no input of the data signal Vdata. Here, the data line 130 on the BC segment can be connected through the repair line 120 in the peripheral wiring, so that the data signal Vdata of the pixel driving circuits 110 in the pixel regions 101 on the BC segment is provided by the repair line 120. At this time, due to the length of the repair line 120, the attenuation of the data signal Vdata received by the pixels on the BC segment is relatively large compared to the adjacent pixel regions 101, resulting in a lower brightness of the pixels on the BC segment, thereby forming a dark line and other effects on the display effect.

[0037] Figure 2 is a schematic diagram of the pixel driving circuit of the display panel of the present application. Refer to Figure 2As shown in the figure, the present application discloses a pixel driving circuit 110 of a display panel 100. The pixel driving circuit 110 includes a data input module 111, a first storage module 112, a reset module 113, a first active switch T1, a light emitting control module 114, and a light emitting unit 115. The data input module 111 is configured to obtain a data signal Vdata from a data line 130 and input the data signal Vdata to the first active switch T1. The control terminal of the first active switch T1 is connected to a first node, and the output terminal of the first active switch T1 is connected to a second node. The first storage module 112 is connected to the first node. The reset module 113 is configured to reset the potential of the first node and the potential of the anodic end of the light emitting unit 115.

[0038] Among them, the light emitting control module 114 includes a second active switch T2, a third active switch T3, and a fourth active switch T4. The input terminal of the second active switch T2 is connected to a power signal ELVDD. The output terminal of the second active switch T2 is connected to the input terminal of the first active switch T1. The control terminal of the second active switch T2 is connected to a third node. The input terminal of the third active switch T3 is connected to the second node. The control terminal of the third active switch T3 is connected to the third node. The output terminal of the third active switch T3 is connected to the anodic end of the light emitting unit 115. The input terminal of the fourth active switch T4 is connected to a first light emitting control signal Em1. The control terminal of the fourth active switch T4 is connected to a second light emitting control signal Em2. The output terminal of the fourth active switch T4 is connected to the third node. A repair control port Em_1 is further preset at the third node.

[0039] In the present application, by reserving the fourth active switch T4 and the repair control port Em_1 in the light emitting control module 114, when there is a pixel area 101 that needs to be repaired and the data line 120 provides the data signal Vdata, the fourth active switch T4 in the pixel area 101 is kept in a cut-off state, so that the first light emitting control signal Em1 no longer controls the light emitting unit 115 in the pixel area 101. By connecting the repair control port Em_1 to a repair control signal Em_2, the light emitting unit 115 is compensated by the repair control signal Em_2, thereby solving the attenuation problem of the data signal Vdata caused by the repair line 120, and thus preventing the problem of uneven brightness and darkness in the repaired pixel area 101. By reserving the repair control port Em_1, the present application realizes the independent operation of the light emitting control of the pixel driving circuit 110 in the repaired pixel area 101, that is, it is controlled by the repair control signal Em_2, which is different from the control method of using the first light emitting control signal Em1 for the pixel area 101 that does not need to be repaired, and solves the problem that the repaired pixel is darker due to the attenuation of the data signal Vdata.

[0040] Among them, the third node is used to control the conduction and cut-off of the second active switch T2 and the third active switch T3. The light-emitting control module 114 mainly controls the conduction and cut-off of the second active switch T2 and the third active switch T3 through the first light-emitting control signal Em1 to control the light-emitting duration of the light-emitting unit 115 in the pixel driving circuit 110. For the repaired segment pixel region 101, through the control of the fourth active switch T4, the first light-emitting control signal Em1 no longer controls the pixel driving circuit 110 of the repaired segment pixel region 101, and the light-emitting duration of the light-emitting unit 115 is controlled by additionally increasing the repair control signal Em_2, so as to compensate the pixel brightness of the repaired segment pixel region 101.

[0041] Specifically, the duty cycle of the repair control signal Em_2 can be adjusted to increase the light-emitting duration of the light-emitting unit 115, so as to realize the brightness compensation of the light-emitting unit 115 in the repaired segment pixel region 101.

[0042] It can be understood that the pixel driving circuit 110 of the present application is the design of the pixel driving circuit 110 before repair. Due to the uncertainty of the disconnection position of the data line 130, for the design of the display panel 100, a repair control port Em_1 needs to be set for the pixel driving circuit 110 of each pixel region 101. When there is a disconnection of the data line 130, the pixel region 101 that provides the data signal Vdata through the repair line 120 is regarded as the repaired segment pixel region 101, and the repair control port Em_1 of the repaired segment pixel region 101 is connected to the repair control signal Em_2. Therefore, at the preset position of the repair control port Em_1, a connection line also needs to be preset, and the function of this connection line is to connect the repair control ports Em_1 of the pixel driving circuits 110 to be repaired together. When there is no disconnection in the display panel 100, the repair control port Em_1 is in a floating state without signal control.

[0043] Figure 3 It is a schematic diagram of the pixel driving circuit of another display panel of the present application. Refer to Figure 3 As shown, on the basis of the previous display panel 100, the light-emitting control module 114 further includes a fifth active switch T5. The input end of the fifth active switch T5 is connected to the second node, the output end of the fifth active switch T5 is connected to the anodic end of the light-emitting unit 115, and the control end of the fifth active switch T5 is connected to the third node.

[0044] In this embodiment, by connecting the third active switch T3 and the fifth active switch T5 in parallel, the third active switch T3 and the fifth active switch T5 form a dual-channel switch, so that the current between the light-emitting unit 115 and the second node is shunted by the third active switch T3 and the fifth active switch T5, reducing the possibility of channel closure caused by a large current, thereby keeping the signal integrity closer to the theoretical value. Moreover, by accessing the repair control signal Em_2 and controlling the duty cycle of the repair control signal Em_2, more precise control of the light-emitting duration of the light-emitting unit 115 is achieved, and brightness compensation for the light-emitting unit 115 in the repair segment pixel region 101 is realized.

[0045] Specifically, the basic architectures of the above two pixel driving circuits 110 are both 7T1C pixel driving circuits 110. On this basis, the light-emitting control module 114 is improved to form an 8T1C or 9T1C pixel driving circuit 110. The 7T1C pixel driving circuit 110 is only an example for illustration and does not limit the connection relationship between the data input module 111, the first storage module 112, and the reset module 113 in the pixel driving circuit 110 of the present application. When there are pixel driving circuits 110 with different architectures, only the light-emitting control module 114 of the present application needs to be adaptively designed into the pixel driving circuit 110, which also belongs to the protection scope of the present application.

[0046] Continue to refer to Figure 2 and Figure 3 As shown, the reset module 113 includes a sixth active switch T6 and a seventh active switch T7. The input end of the sixth active switch T6 is connected to the reset signal Vint, the output end of the sixth active switch T6 is connected to the first node, the input end of the seventh active switch T7 is connected to the reset signal Vint, the output end of the seventh active switch T7 is connected to the anodic end of the light-emitting unit 115, and the control ends of the sixth active switch T6 and the seventh active switch T7 are connected to the first control signal S1.

[0047] The first storage module 112 includes a first capacitor C1. One end of the first capacitor C1 is connected to the power supply signal ELVDD, and the other end of the first capacitor C1 is connected to the first node; the data input module 111 includes an eighth active switch T8 and a ninth active switch T9. The input end of the eighth active switch T8 is connected to the data line 130, the control end of the eighth active switch T8 is connected to the second control signal S2, and the output end of the eighth active switch T8 is connected to the input end of the first active switch T1; the input end of the ninth active switch T9 is connected to the second node, the output end of the ninth active switch T9 is connected to the first node, and the control end of the ninth active switch T9 is connected to the second control signal S2.

[0048] The first control signal S1 and the second control signal S2 mentioned in this embodiment are generally provided by a gate driving circuit. The first control signal S1 and the second control signal S2 can be sequentially turned on row by row, or the first control signal S1 corresponding to multiple rows of pixels can be individually turned on row by row, and the second control signal S2 can be individually turned on row by row. It can be selected and designed according to the actual situation. The timing sequence has nothing to do with "first" and "second", and the time when the first control signal S1 or the second control signal S2 is at the working level is usually the opening duration of one row of scan lines. Among them, when the active switch is a P-type thin film transistor, the working level is a logic low level, and when the active switch is an N-type thin film transistor, the working level is a logic high level. Specifically, in this example, except for the fourth active switch T4, the rest of the active switches are P-type thin film transistors, and the fourth active switch T4 is an N-type thin film transistor. Then, for the first control signal S1 and the second control signal S2, the working level is a logic low level, and there is only one logic low level in one frame time or one scan cycle, and the rest of the time is a logic high level.

[0049] Figure 4 is a timing schematic diagram of the pixel driving circuit before repair of this application. See Figure 4 As shown, it is mainly a timing schematic diagram of the pixel driving circuit 110 of the pixel area 101 that does not need to be repaired. At this time, the repair control port Em_1 of each pixel driving circuit 110 is not connected to the repair control signal Em_2. The pixel driving circuit 110 includes a reset stage, a data writing compensation stage, and a light emitting stage.

[0050] In the reset stage, the first control signal S1 is at a logic low level, the second control signal S2 is at a logic high level, the first light emitting control signal Em1 is at a logic high level, and the second light emitting control signal Em2 is also at a logic high level. The sixth active switch T6 and the seventh active switch T7 are respectively turned on; the potentials of the first node and the anodic end of the light emitting unit 115 are reset, so that the residual data of the previous frame will not affect the display of the current frame. Among them, for the pixel driving circuit 110 of the pixel area 101 that does not need to be repaired, the second light emitting control signal Em2 can always be at a high level, so that the fourth active switch T4 is normally kept turned on, so that the second active switch T2 and the third active switch T3 work under the control of the first light emitting control signal Em1. Of course, the second light emitting control signal Em2 can also correspond to the waveform of the first light emitting control signal Em1. When the first light emitting control signal Em1 is at a logic low level, the second light emitting control signal Em2 is at a logic high level, so that the fourth active switch T4 is turned on, and the first light emitting control signal Em1 flows into the second active switch T2 and the third active switch T3.

[0051] During the data writing compensation phase, the first active switch T1, the eighth active switch T8, and the ninth active switch T9 are turned on respectively. At this time, the first capacitor C1 is charged through the data signal Vdata, and the potential of the first node is raised. During this process, generally, the threshold of the first active switch T1 is also compensated, so that the first active switches T1 with different thresholds in multiple pixel regions 101 have the least influence on the brightness of the light-emitting unit 115. It is worth mentioning that the first active switch T1 is generally a driving transistor, and the magnitude of the current or voltage output by the first active switch T1 can be adjusted by controlling the voltage at the control terminal of the first active switch T1, so that different data signals Vdata input can control the light-emitting unit 115 to have different brightnesses.

[0052] During the light-emitting phase, the first light-emitting control signal Em1 is at a logic low level, and the second light-emitting control signal Em2 is at a logic high level. The first active switch T1, the second active switch T2, the third active switch T3, the fourth active switch T4, and the fifth active switch T5 are turned on respectively, and the light-emitting unit 115 emits light.

[0053] Figure 5 is a schematic diagram of the repaired display panel of the present application, Figure 6 is a schematic diagram of the pixel driving circuit of the repaired display panel of the present application, Figure 7 is a timing schematic diagram of the pixel driving circuit of the repaired display panel of the present application. Refer to Figures 5 to 7As shown, the present application also discloses a repaired display panel 100 and its pixel driving circuit 110. The display panel 100 includes a plurality of pixel regions 101, and a pixel driving circuit 110 is disposed in each pixel region 101. The pixel driving circuit 110 includes a data input module 111, a first storage module 112, a reset module 113, a first active switch T1, a light emitting control module 114, and a light emitting unit 115. The data input module 111 is configured to obtain a data signal Vdata from a data line 130 and input the data signal Vdata to the first active switch T1. The control end of the first active switch T1 is connected to a first node, and the output end of the first active switch T1 is connected to a second node. The first storage module 112 is connected to the first node. The reset module 113 is configured to reset the potential of the first node and the potential of the anode terminal of the light emitting unit 115. Wherein, the light emitting control module 114 includes a second active switch T2, a third active switch T3, and a fourth active switch. The input end of the second active switch T2 is connected to a power signal ELVDD, the output end of the second active switch T2 is connected to the input end of the first active switch T1, and the control end of the second active switch T2 is connected to a third node. The input end of the third active switch T3 is connected to the second node, the control end of the third active switch T3 is connected to the third node, and the output end of the third active switch T3 is connected to the anode terminal of the light emitting unit 115. The input end of the fourth active switch T4 receives a first light emitting control signal Em1, the control end of the fourth active switch T4 receives a second light emitting control signal Em2, the output end of the fourth active switch T4 is connected to the third node, and a repair control port Em_1 is further preset at the third node.

[0054] The display panel 100 further includes a data line 130 and a repair line 120. The data line 130 is configured to provide a data signal Vdata for the data input module 111. At least one first pixel repair region 102 exists in the plurality of pixel regions 101. In the pixel driving circuit 110 in the first pixel repair region 102, the repair line 120 is configured to provide a data signal Vdata for the data input module 111 of the pixel driving circuit 110. The repair control port Em_1 is connected to a repair control signal Em_2, and the control end of the fourth active switch T4 is disconnected from the second light emitting control signal Em2.

[0055] In this embodiment, the first pixel repair region 102 corresponds to the above-mentioned repaired segment pixel region 101. Generally speaking, when the data line 130 is broken, the light emitting units 115 of at least one or more pixel regions 101 cannot be lit. At this time, the repair line 120 provides the data line 130 for the pixel driving circuit 110 of the first pixel repair region 102. Combined withFigures 5 to 6 As shown, a break occurs at point C of the data line 130, resulting in the pixel driving circuit 110 in the BC segment being unable to receive the data signal Vdata. Then, by connecting at the B end through the peripheral repair line 120, the data signal Vdata is transmitted to the pixel driving circuit 110 through the repair line 120.

[0056] For the fourth active switch T4 in the pixel driving circuit 110, it is necessary to disconnect the connection with the second light emission control signal Em2, so that the fourth active switch T4 remains in the cut-off state, thereby preventing the first light emission control signal Em1 from being input to the control terminals of the second active switch T2 and the third active switch T3. Generally, the signal line for transmitting the first light emission control signal Em1 is generally in the same direction as the first control signal S1, and one row of pixel regions 101 shares one first light emission control signal Em1. In this embodiment, the signal line for transmitting the second light emission control signal Em2 is in the same direction as the data line 130, and one column of pixel regions 101 shares one second light emission control signal Em2 or multiple columns of pixel regions 101 share one second light emission control signal Em2. Of course, it is also possible for the entire display panel 100 to share one second light emission control signal Em2. During the repair process, it is necessary to disconnect the second light emission control signal Em2 in the first pixel repair region 102 from the second light emission control signal Em2 in the normally displayed pixel region 101, which can be achieved by laser cutting. Thus, there is no longer a logic high level or low level in the second light emission control signal Em2 in the first pixel repair region 102, so that the fourth active switch T4 always remains in the cut-off state, and the first light emission control signal Em1 no longer controls the pixel driving circuit 110. For the connection of the repair control signal Em_2, the repair line 120 and the data line 130, it can be connected by laser or conductive filling, which is not limited herein.

[0057] Specifically, the display panel 100 further includes a detection module 140, and the detection module 140 is used to detect the attenuation degree of the data signal Vdata in the first pixel repair region 102 or the brightness difference of the light emitting unit 115, and control the duty cycle of the repair control signal Em_2 according to the attenuation degree of the data signal Vdata or the brightness difference of the light emitting unit 115.

[0058] In this embodiment, the detection module 140 can be built into the driving circuit of the display panel 100, or can be an external or externally connected test and detection module 140, etc. Its main purpose is to calculate the compensation data of the light-emitting unit 115. For example, to repair the duty cycle of the control signal Em_2. The brightness of the light-emitting unit 115 is generally related to two factors. One is the magnitude of the current passing through the light-emitting unit 115, and this current magnitude is related to the input data signal Vdata. The other is the light-emitting duration, which is generally adjusted by the first light-emitting control signal Em1, and the light-emitting duration is positively correlated with the duty cycle of the first light-emitting control signal Em1. The main compensation method of this application is to compensate for the problem of insufficient light-emitting brightness caused by the attenuation of the data signal Vdata by extending the light-emitting duration of the light-emitting unit 115 in the first pixel repair area 102.

[0059] For the inspection module, the attenuation degree of the data signal Vdata can be detected, for example, by detecting the line resistance of the repair line 120, and the attenuation degree of the data signal Vdata can be calculated. For example, by inputting a test data signal Vdata and detecting the gray level of the light-emitting unit 115, the attenuation degree of the data signal Vdata can be identified.

[0060] Another way is during the debugging process of the display panel 100, by way of comparison. That is, the same data signal Vdata is input to the light-emitting unit 115 in the first pixel repair area 102 and the light-emitting unit 115 in the normal pixel area at the same time. By comparing the brightness of the two light-emitting units 115, the duty cycle of the repair control signal Em_2 is adjusted so that the brightness of the two light-emitting units 115 is the same, thereby realizing the brightness compensation of the light-emitting unit 115 in the first pixel repair area 102.

[0061] In the pixel driving circuit 110 of the pixel area 101 (which can be called the normal pixel area) other than the first pixel repair area 102, the first light-emitting control signal Em1 and the second light-emitting control signal Em2 control the light-emitting duration of the light-emitting unit 115; in the pixel driving circuit 110 of the first pixel repair area 102, the repair control signal Em_2 controls the light-emitting duration of the light-emitting unit 115; the duty cycle of the repair control signal Em_2 is different from that of the first light-emitting control signal Em1. Among them, the duty cycle of the repair control signal Em_2 refers to the maintenance time of the logic low level, and also corresponds to the light-emitting duration of the light-emitting unit 115.

[0062] Specifically, the data input module 111, the first storage module 112, the reset module 113, and the light-emitting control module 114 in the pixel driving circuit 110 in this embodiment are the same as those in the pixel driving circuit 110 before repair, and will not be elaborated here.

[0063] Among them, for the pixel driving circuit 110 of the first pixel repair area 102, the pixel driving circuit 110 also includes a reset stage, a data writing compensation stage, and a light emitting stage. The second light emitting control signal Em2 is not connected to the fourth active switch T4 in the pixel driving circuit 110, so that the fourth active switch T4 always remains in the cut-off state, so that the first light emitting control signal Em1 does not control the second active switch T2 and the third active switch T3.

[0064] In the reset stage and the data writing compensation stage, they are the same as those of the above normal pixel area. In the light emitting stage, the first active switch T1, the second active switch T2, the third active switch T3, and the fifth active switch T5 are respectively turned on, and the light emitting unit 115 emits light; the repair control signal Em_2 controls the second active switch T2, the third active switch T3, and the fifth active switch T5 to be respectively turned on.

[0065] For the pixel driving circuit 110 in the pixel area 101 (i.e., the normal pixel area) except the first pixel repair area 102, when the pixel driving circuit 110 is in the light emitting stage, the first light emitting control signal Em1 and the second light emitting control signal Em2 control the second active switch T2, the third active switch T3, and the fifth active switch T5 to be respectively turned on.

[0066] Figure 8 It is a schematic diagram of the steps of the repair and debugging method of the display panel of the present application. Refer to Figure 8 As shown, the present application also discloses a repair and debugging method for a display panel, including the steps:

[0067] S110: When it is detected that there is a broken line in the display panel, a repair line is connected to the pixel driving circuit of the first pixel repair area, and the repair control signal is connected to a preset repair control port. Among them, the detection of the broken line is generally during the test process, a specific data signal is input to the display panel, for example, the pure color screen of the display panel is detected, so as to select the pixels with poor display and detect the broken data line. The specific repair method can be realized by laser cutting, conductive filling and other methods to connect the repair line.

[0068] S120: Detect the attenuation degree of the data signal in the first pixel repair area or the brightness of the light emitting unit. Among them, various devices can be used, such as detection devices, by inputting a preset data signal, to judge whether the light emitting brightness of the light emitting unit in the first pixel repair area conforms to the brightness corresponding to the preset data signal. Of course, the attenuation degree of the data signal in the first pixel repair area can also be obtained by detecting capacitors, resistors and other methods.

[0069] S130: Control the duty cycle of the repair control signal according to the attenuation degree of the data signal or the brightness of the light-emitting unit. Among them, the repair control signal controls the light-emitting units in the first pixel repair area to emit light, and the light-emitting units in the first pixel repair area do not emit light before being connected to the repair line.

[0070] Among them, the steps in S110 include the steps of:

[0071] S111: When it is detected that there is a broken line in the display panel, determine the first pixel repair area. Among them, the first pixel repair area is generally a continuous plurality from the broken line position to the end of the data line. These pluralities are respectively connected to the same data line and are usually regarded as a group. Only one repair line needs to be connected to this data line. When there are multiple broken lines, multiple repair lines can be selected to connect to the data lines with broken lines at multiple places respectively.

[0072] S112: In the first pixel repair area, disconnect the connection between the control end of the fourth active switch and the second light-emitting control signal. When designing the fourth active switch, the fourth active switch in each pixel area is connected to the second light-emitting control signal. However, when the first pixel repair area appears, the second light-emitting control signal in the first pixel repair area needs to be cut off. That is, disconnect the control end of the fourth active switch from the signal line transmitting the second light-emitting control signal.

[0073] S113: Connect the repair line to the pixel drive circuit in the first pixel repair area, and connect the repair control signal to the preset repair control port. When the repair line is working, the repair line needs to be connected to the data line corresponding to the first pixel repair area, and the signal line transmitting the preset repair control signal needs to be connected to the repair control port. Considering that usually, some continuous pixel areas on one data line cannot be displayed after the broken line, therefore, the signal branch line transmitting the preset repair control signal can be arranged in parallel with the data line, and one is provided for each data line, and a signal bus for transmitting the repair control signal is arranged in the peripheral routing. When the position of the first pixel repair area is determined, the signal branch line transmitting the repair control signal is connected to the signal bus for transmitting the repair control signal, and the repair control port in the first pixel repair area is connected to the signal branch line transmitting the repair control signal, so as to realize the transmission of the repair control signal to the repair control port.

[0074] The present application realizes the brightness compensation of the light-emitting units in the first pixel repair area by controlling the duty cycle of the repair control signal. Compared with compensating the first pixel repair area by adjusting the RC through an external circuit, the present application does not require an external RC adjustment circuit, and only needs to adjust the duty cycle of the repair control signal, which can be achieved by controlling the repair control signal output by the timing controller during the repair test stage. In comparison, there is no need to change the RC value, which is more digital and has a higher adjustable precision, greatly saving the time for broken wire repair testing, and the debugging effect is more stable, avoiding the problem that the display effect may not reach the best level during debugging due to the large influence of electronic components by the external environment, such as when encountering high temperature or other harsh conditions.

[0075] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the space of the application documents is limited and cannot list them all. Therefore, on the premise of no conflict, the above-described embodiments or technical features can be combined arbitrarily to form new embodiments, and after the combination of each embodiment or technical feature, the original technical effect will be enhanced.

[0076] The above content is a further detailed description of the present application in combination with specific optional implementation manners, and it cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application belongs, without departing from the concept of the present application, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present application.

Claims

1. A pixel driving circuit of a display panel, wherein the display panel comprises a plurality of pixel regions, and a pixel driving circuit is arranged in each of the pixel regions, wherein: The pixel driving circuit includes a data input module, a first storage module, a reset module, a first active switch, a light-emitting control module and a light-emitting unit, wherein the data input module is used to obtain a data signal from a data line and input the data signal to the first active switch; the control end of the first active switch is connected to a first node, and the output end of the first active switch is connected to a second node; the first storage module is connected to the first node; the reset module is used to reset the potential of the first node and the potential of the anode end of the light-emitting unit; Wherein, the light emitting control module includes a second active switch, a third active switch and a fourth active switch, The input end of the second active switch is connected to the power signal, the output end of the second active switch is connected to the input end of the first active switch, and the control end of the second active switch is connected to the third node; The input end of the third active switch is connected to the second node, the control end of the third active switch is connected to the third node, and the output end of the third active switch is connected to the anode end of the light emitting unit; The input end of the fourth active switch is connected to the first light-emitting control signal, the control end of the fourth active switch is connected to the second light-emitting control signal, the output end of the fourth active switch is connected to the third node, and the third node is also preset with a repair control port.

2. The pixel driving circuit of the display panel according to claim 1, characterized in that: The light emitting control module further includes a fifth active switch, an input end of the fifth active switch is connected to the second node, an output end of the fifth active switch is connected to the anode end of the light emitting unit, and a control end of the fifth active switch is connected to the third node.

3. The pixel driving circuit of the display panel according to claim 1, characterized in that: The reset module includes a sixth active switch and a seventh active switch, the input end of the sixth active switch is connected to the reset signal, the output end of the sixth active switch is connected to the first node, the input end of the seventh active switch is connected to the reset signal, the output end of the seventh active switch is connected to the anode end of the light emitting unit, and the control end of the sixth active switch and the control end of the seventh active switch are connected to the first control signal; The first storage module includes a first capacitor, one end of the first capacitor is connected to the power signal, and the other end of the first capacitor is connected to the first node; The data input module comprises an eighth active switch and a ninth active switch, the input end of the eighth active switch is connected to the data line, the control end of the eighth active switch is connected to the second control signal, and the output end of the eighth active switch is connected to the input end of the first active switch; An input terminal of the ninth active switch is connected to the second node, an output terminal of the ninth active switch is connected to the first node, and a control terminal of the ninth active switch is connected to a second control signal.

4. A pixel driving circuit of a repaired display panel, characterized in that: The display panel includes a plurality of pixel areas, each of which is provided with a pixel driving circuit, and the pixel driving circuit includes a data input module, a first storage module, a reset module, a first active switch, a light control module and a light emitting unit; the data input module is used to obtain a data signal from a data line and input the data signal to the first active switch; the control end of the first active switch is connected to a first node, and the output end of the first active switch is connected to a second node; the first storage module is connected to the first node; the reset module is used to reset the potential of the first node and the potential of the anode end of the light emitting unit; Wherein, the light control module includes a second active switch, a third active switch and a fourth active switch, the input end of the second active switch is connected to the power signal, the output end of the second active switch is connected to the input end of the first active switch, and the control end of the second active switch is connected to the third node; the input end of the third active switch is connected to the second node, the control end of the third active switch is connected to the third node, and the output end of the third active switch is connected to the anode end of the light-emitting unit; the input end of the fourth active switch is connected to the first light control signal, the control end of the fourth active switch is connected to the second light control signal, the output end of the fourth active switch is connected to the third node, and the third node is also preset with a repair control port; The display panel further comprises a data line and a repair line, wherein the data line is used to provide a data signal to the data input module; There is at least one first pixel repair area among the multiple pixel areas. In the pixel driving circuit within the first pixel repair area, the repair line is used to provide a data signal to the data input module of the pixel driving circuit, the repair control port is connected to the repair control signal, and the control end of the fourth active switch is disconnected from the second light-emitting control signal.

5. The pixel driving circuit of the repaired display panel according to claim 4, characterized in that: The display panel also includes a detection module, which is used to detect the attenuation degree of the data signal or the brightness difference of the light-emitting unit in the first pixel repair area, and control the duty cycle of the repair control signal according to the attenuation degree of the data signal or the brightness difference of the light-emitting unit.

6. The pixel driving circuit of the repaired display panel according to claim 5, characterized in that: In the pixel driving circuit in the pixel area except the first pixel repair area, the first light-emitting control signal and the second light-emitting control signal control the light-emitting duration of the light-emitting unit; In the pixel driving circuit of the first pixel repair area, the repair control signal controls the light-emitting duration of the light-emitting unit; The repair control signal and the first light emitting control signal have different duty ratios.

7. The pixel driving circuit of the repaired display panel according to claim 5, characterized in that: The light emitting control module further includes a fifth active switch, wherein an input end of the fifth active switch is connected to the second node, an output end of the fifth active switch is connected to the anode end of the light emitting unit, and a control end of the fifth active switch is connected to the third node; The reset module includes a sixth active switch and a seventh active switch, the input end of the sixth active switch is connected to the reset signal, the output end of the sixth active switch is connected to the first node, the input end of the seventh active switch is connected to the reset signal, the output end of the seventh active switch is connected to the anode end of the light emitting unit, and the control end of the sixth active switch and the control end of the seventh active switch are connected to the first control signal; The first storage module includes a first capacitor, one end of the first capacitor is connected to the power signal, and the other end of the first capacitor is connected to the first node; The data input module comprises an eighth active switch and a ninth active switch, the input end of the eighth active switch is connected to the data line, the control end of the eighth active switch is connected to the second control signal, and the output end of the eighth active switch is connected to the input end of the first active switch; An input terminal of the ninth active switch is connected to the second node, an output terminal of the ninth active switch is connected to the first node, and a control terminal of the ninth active switch is connected to a second control signal.

8. The pixel driving circuit of the repaired display panel according to claim 7, characterized in that: The pixel driving circuit includes a reset phase, a data writing compensation phase, and a light emitting phase. In the reset stage, the sixth active switch and the seventh active switch are turned on respectively; In the data writing compensation phase, the first active switch, the eighth active switch, and the ninth active switch are turned on respectively; In the light-emitting stage, the first active switch, the second active switch, the third active switch, and the fifth active switch are turned on respectively, and the light-emitting unit emits light; When the pixel driving circuits of the pixel areas other than the first pixel repair area are in the light-emitting stage, the first light-emitting control signal and the second light-emitting control signal control the second active switch, the third active switch and the fifth active switch to be turned on respectively; When the pixel driving circuit of the first pixel repair area is in the light-emitting stage, the repair control signal controls the second active switch, the third active switch and the fifth active switch to be turned on respectively.

9. A method for repairing and debugging a display panel, characterized in that: The display panel comprises a pixel driving circuit of the display panel according to any one of claims 1 to 3, and the repair and debugging method comprises the steps of: When a disconnection of the display panel is detected, a repair line is connected to the pixel driving circuit of the first pixel repair area, and a repair control signal is connected to a preset repair control port; Detecting the attenuation degree of the data signal of the first pixel repair area or the brightness of the light-emitting unit; Controlling the duty cycle of the repair control signal according to the attenuation degree of the data signal or the brightness of the light-emitting unit; The repair control signal controls the light-emitting unit in the first pixel repair area to emit light, and the light-emitting unit in the first pixel repair area does not emit light before being connected to the repair line.

10. The display panel repair and debugging method according to claim 9, characterized in that: The step of connecting a repair line to a pixel driving circuit in a first pixel repair area and connecting a repair control signal to a preset repair control port when a breakpoint is detected on the display panel comprises the following steps: When a disconnection of the display panel is detected, determining a first pixel repair area; In the first pixel repair area, disconnecting the control end of the fourth active switch from the second light emitting control signal; A repair line is connected to the pixel driving circuit of the first pixel repair area, and a repair control signal is connected to a preset repair control port.

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