Display panel, control method and control device of display panel and display device

Abstract

The invention provides a display panel, a control method and device of the display panel and a display device, and relates to the technical field of display. The display panel comprises an anode layer, a light-emitting layer and a cathode layer, the light-emitting layer comprises a plurality of light-emitting units, the anode layer comprises a plurality of anode units corresponding to the light-emitting units, the cathode layer comprises a plurality of cathode units arranged separately, and the cathode units are connected to the light-emitting units of different colors in the display panel and / or connected to the light-emitting units of different colors in the display panel. The plurality of cathode units respectively cover the light-emitting units in different areas in the display panel; the anode units corresponding to different cathode units in the plurality of cathode units receive different data signals when the display panel displays a black picture. According to the technical scheme, the problem that the display panel is inconsistent in pixel lightening under a black picture can be solved, and the display effect and the user experience of the display panel are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a display panel, a control method for a display panel, a control device, and a display device. Background Art

[0002] Due to the self-luminous characteristics, Organic Light-Emitting Diode (OLED) displays do not require backlights, can achieve thinner and lighter designs, and provide wider viewing angles and faster response times. Therefore, they have been widely used in various fields such as smartphones, TVs, and wearable devices. However, during the development of OLED displays, due to various factors such as process deviations of luminescent materials, aging speed, and changes in ambient temperature, the display screen will have inconsistent pixel lighting under black screens. This problem will cause color deviation and visual unevenness of the display screen, which will bring a bad visual experience to consumers.

[0003] In view of this, how to solve the problem of inconsistent pixel lighting on a display screen under a black screen is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The present application provides a display panel, a control method for a display panel, a control device, and a display device, which can solve the problem of inconsistent pixel lighting of the display panel under a black screen, and improve the display effect and user experience of the display panel.

[0005] In a first aspect, a display panel is provided, comprising: an anode layer, a light-emitting layer and a cathode layer, wherein the light-emitting layer comprises a plurality of light-emitting units, the anode layer comprises a plurality of anode units corresponding to the plurality of light-emitting units, the cathode layer comprises a plurality of cathode units separately arranged, the plurality of cathode units are respectively connected to light-emitting units of different colors in the display panel, and / or the plurality of cathode units respectively cover light-emitting units in different areas of the display panel; anode units corresponding to different cathode units among the plurality of cathode units receive different data signals when the display panel displays a black screen.

[0006] Through the technical solution of the embodiments of the present application, light-emitting units in different areas and / or different colors in the display panel are respectively provided with respective cathode units, and the anode units corresponding to different cathode units receive different data signals. Therefore, the light-emitting brightness of light-emitting units in different areas and / or different colors corresponding to different cathode units can be adjusted separately, which can effectively solve the problem of inconsistent pixel lighting under black screen, and improve the display effect and user experience of the display panel.

[0007] In some possible embodiments, the multiple cathode units include multiple stacked sub-cathode layers, an insulating layer is provided between two adjacent sub-cathode layers in the multiple sub-cathode layers, and the multiple sub-cathode layers are respectively connected to light-emitting units of different colors in the display panel through via structures.

[0008] In some possible implementations, the plurality of sub-cathode layers include three sub-cathode layers, and the three sub-cathode layers are respectively connected to a red light-emitting unit, a blue light-emitting unit, and a green light-emitting unit in the display panel.

[0009] Through the technical solution of this embodiment, the three-color light-emitting units in the display panel are each provided with an independent sub-cathode layer, which is conducive to separately controlling the light emission of the three-color light-emitting units, thereby better improving the problem of different color pixels in the display panel lighting up at different times.

[0010] In some possible implementations, the plurality of cathode units include a plurality of sub-cathode regions disposed in the same layer, and the plurality of sub-cathode regions respectively cover light-emitting units in different regions of the display panel.

[0011] Through the technical solution of this embodiment, different areas of the display panel are provided with independent sub-cathode areas, which is conducive to controlling the light emission of different areas separately, thereby better improving the problem of pixels in different areas of the display panel lighting up at different times.

[0012] In some possible implementations, a plurality of sub-cathode regions are distributed in a 3×3 array in the display panel.

[0013] In this embodiment, the distribution of the nine sub-cathode regions in the display panel can take into account both the complexity of routing and the improvement of the inconsistent lighting of pixels in the display panel, and can have better overall performance.

[0014] In some possible embodiments, the plurality of cathode units include a plurality of sub-cathode layers, the plurality of sub-cathode layers include a plurality of groups of sub-cathode layers, the plurality of groups of sub-cathode layers respectively cover light-emitting units in different areas of the display panel, and each group of sub-cathode layers includes three stacked sub-cathode layers, and the three sub-cathode layers are respectively connected to the red light-emitting units, the blue light-emitting units and the green light-emitting units in the local area of ​​the display panel.

[0015] Through the technical solution of this embodiment, the problem of inconsistent lighting of different areas and different pixels in the display panel can be comprehensively considered, so that the data signals of the black screen are set respectively for different pixels in different areas of the display panel, so as to better improve the display effect of the display panel.

[0016] In some possible implementations, multiple cathode units are connected to a current detector for detecting a current time difference among the multiple cathode units, and the current time difference is used to control data signals received by anode units corresponding to the multiple cathode units when the display panel displays a black screen.

[0017] In this embodiment, the current detector can conveniently detect the time difference of the current in multiple cathode units, which is beneficial to the adjustment of data signals of different colors and / or different areas when the display panel displays a black screen.

[0018] In some possible embodiments, the current detector is connected to the data driving chip, and the current detector is used to send the current time difference of multiple cathode units to the data driving chip, so that the data driving chip controls the data signals received by the anode units corresponding to the multiple cathode units when the display panel displays a black screen according to the current time difference.

[0019] In some possible implementations, the current detector is connected between the plurality of cathode units and a power chip for driving the plurality of cathode units. This technical solution can facilitate the wiring design between the current detector and the power chip.

[0020] In some possible embodiments, when there is a current time difference between any two cathode units among a plurality of cathode units, the anode unit corresponding to at least one cathode unit among any two cathode units is used to receive a modified black screen data signal, and the voltage of the modified black screen data signal is K1 times the voltage of the default black screen data signal; or, when the currents of the plurality of cathode units are driven synchronously, the anode units corresponding to the plurality of cathode units are used to receive an initial black screen data signal, and the voltage of the initial black screen data signal is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1.

[0021] In some possible embodiments, the current detector is used to detect the current time difference of multiple cathode units when the display panel displays an initial black screen and / or a test black screen, wherein the initial black screen is a black screen displayed by the display panel when it is turned on, and the test black screen is a black screen displayed by the display panel during the factory testing stage.

[0022] Through the technical solution of this implementation, the current time difference of multiple cathode units is detected under the test black screen and / or the initial black screen, and then the data signals of the anode units corresponding to the multiple cathode units are adjusted, which is beneficial to improve the accuracy of the data signal adjustment and better improve the problem of inconsistent pixel lighting.

[0023] In some possible implementations, when the display panel displays a black picture, the plurality of cathode units are used to respectively receive a plurality of different cathode driving signals.

[0024] Through the technical solution of this implementation, different cathode drive signals can also adjust the luminous brightness of different areas and / or luminous units of different colors corresponding to different cathode units, thereby solving the problem of inconsistent pixel lighting under black screen, and improving the display effect and user experience of the display panel.

[0025] In a second aspect, a control method for a display panel is provided, comprising: obtaining a current time difference of a plurality of cathode units separately arranged in the display panel, wherein the plurality of cathode units are respectively connected to light-emitting units of different colors of the display panel, and / or the plurality of cathode units respectively cover light-emitting units in different areas of the display panel; based on the current time difference of the plurality of cathode units, outputting a data signal of the display panel when displaying a black screen to the anode units corresponding to the plurality of cathode units.

[0026] In some possible embodiments, the above-mentioned control of the data signals received by the anode units corresponding to the multiple cathode units when the display panel displays a black screen according to the current time difference of the multiple cathode units includes: in the case where there is a current time difference between any two cathode units among the multiple cathode units, outputting a corrected black screen data signal to the anode unit corresponding to at least one cathode unit among any two cathode units, and the voltage of the corrected black screen data signal is K1 times the voltage of the default black screen data signal; or, in the case where the currents of the multiple cathode units are synchronously driven, outputting an initial black screen data signal to the anode units corresponding to the multiple cathode units, and the voltage of the initial black screen data signal is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1.

[0027] In some possible embodiments, the above-mentioned acquisition of the current time difference of multiple cathode units separately set in the display panel includes: acquiring the current time difference of the multiple cathode units detected by a current detector, wherein the current detector is arranged between the display panel and a power chip for driving the multiple cathode units in the display panel.

[0028] In some possible embodiments, the above-mentioned obtaining of the current time difference of multiple cathode units separately arranged in the display panel includes: when the display panel is displaying an initial black screen and / or a test black screen, obtaining the current time difference of multiple cathode units in the display panel, wherein the initial black screen is a black screen displayed by the display panel when it is turned on, and the test black screen is a black screen displayed by the display panel during the factory test stage; the above-mentioned outputting the data signal of the display panel when displaying a black screen to the anode units corresponding to the multiple cathode units according to the current time difference of the multiple cathode units includes: outputting the data signal when the display panel displays a subsequent black screen to the anode units corresponding to the multiple cathode units according to the current time difference of the multiple cathode units.

[0029] In a third aspect, a control device for a display panel is provided, comprising: a processor and an interface circuit, wherein the interface circuit is connected to the display panel, and the processor is used to execute the control method in the second aspect or any possible implementation manner of the second aspect.

[0030] In a fourth aspect, a display device is provided, comprising: a control device, and a display panel in the first aspect or any possible implementation of the first aspect, wherein the control device is used to input a data signal to the display panel to control the display of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a display screen provided in an embodiment of the present application.

[0032] Figure 2 It is a cross-sectional view of a display panel provided in an embodiment of the present application.

[0033] Figure 3 It is a schematic diagram of a display panel provided in an embodiment of the present application.

[0034] Figure 4 is a schematic diagram of another display panel provided in an embodiment of the present application.

[0035] Figure 5 is a schematic diagram of another display panel provided in an embodiment of the present application.

[0036] Figure 6 This is an architectural diagram of a display screen provided in an embodiment of the present application.

[0037] Figure 7 It is an architectural diagram of another display screen provided in an embodiment of the present application.

[0038] Figure 8 It is a flowchart of a method for controlling a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0040] The present application relates to a display screen. The display screen can be applied to a variety of fields and scenarios. As an example, the display screen can be applied to 3C electronic products of computers, communications and consumer electronics, including but not limited to televisions, mobile phones, computers, laptops, tablet computers, personal digital assistants (PDAs), car computers, wearable devices, gaming devices, photographing devices, etc. The present application does not limit the specific type of electronic device where the display screen is located.

[0041] In addition, the display screen involved in the present application may be an OLED display screen, a low-temperature polycrystalline silicon (LTPS) OLED display screen, an oxide OLED display screen, a micro OLED display screen, etc. The present application does not limit the specific type of the OLED display screen.

[0042] Figure 1 A schematic diagram of a display screen provided in an embodiment of the present application is shown.

[0043] like Figure 1 As shown, the display screen 100 may include: a pixel array 110, a scan driving circuit 120 and a data driving circuit 130. The pixel array 110 includes a plurality of pixel units 111, and the plurality of pixel units 111 may be arranged into N rows and M columns according to actual needs to form a display area of ​​the display screen 100 and present display effects of different pictures.

[0044] For an OLED display screen, each pixel unit 111 may include an independent light-emitting unit and a pixel circuit for controlling the light-emitting unit. The light-emitting unit may include organic light-emitting materials of three colors: red (Red, R), green (Green, G), and blue (Blue, B). The light-emitting materials are driven by current to emit light to form color pixels. The pixel circuit may include electrical components such as a switch tube and a capacitor. The state of the switch tube is controlled by a control signal, so that the light-emitting unit can be effectively driven.

[0045] For other types of display screens, each has its own light-emitting principle, but no matter which display screen is used, each pixel unit 111 has a pixel circuit to control the light emission of each pixel unit 111. The scan drive circuit 120 and the data drive circuit 130 can be connected to each pixel unit 111 in the pixel array 110, so as to provide a control signal to the pixel circuit of each pixel unit. Specifically, for N rows and M columns of pixel units 111, the scan drive circuit 120 can be connected to the N rows of pixel units 111 to control the opening and closing of the N rows of pixel units 111. The data drive circuit 130 can be connected to the M columns of pixel units 111 to provide display data to the M columns of pixel units.

[0046] Alternatively, if Figure 1As shown, the display screen 100 may further include a timing control circuit 140, which may also be referred to as a timing controller (Timer Control Register, TCON), which may be connected to the scan drive circuit 120 and / or the data drive circuit 130. The timing control circuit 140 may receive a display control signal, and control the working timing of the scan drive circuit 120 and / or the data drive circuit 130 according to the display control signal, and may control the display data of the data drive circuit 130, wherein the display control signal includes but is not limited to: a power signal, an image signal, a mode control signal, and the like.

[0047] In some implementations of the embodiments of the present application, the data driving circuit 130 may be a source driver or a source driver chip (Source Driver IC), and the data driving circuit 130 may be separately provided from the display panel 101 where the pixel array 110 is located. The display panel 101 may have different structures according to different types of display screens 100, but generally speaking, the substrate of the display panel is a transparent substrate such as glass or plastic, and the pixel circuit of the pixel array 110 may be formed on the substrate through semiconductor processes, and then the light-emitting unit of the pixel array 110 may be formed in combination with other components, so as to form the main part of the display screen 100, the display panel 101. The specific structure of the display panel 101 may refer to the specific description of the related art, and will not be described in detail here.

[0048] In some implementations of the present application, the scan driving circuit 120 may be a gate driver or a gate driver IC independent of the display panel 101. Figure 1 As shown, the scan driving circuit 120 can also be integrated into the display panel 101. The scan driving circuit 120 can be called a GOA circuit. The GOA circuit can be prepared on a transparent substrate synchronously with the pixel circuit of the pixel array 110, thereby simplifying the manufacturing process of the display screen 100.

[0049] In addition to the control circuits for controlling the light emission of the display panel, such as the scan drive circuit 120, the data drive circuit 130, and the timing control circuit 140, the display screen 100 may further include a power supply circuit 150, which may provide a power supply signal for the display panel 101. Optionally, the power supply circuit 150 may be a power supply chip. Optionally, the power supply circuit 150 may provide a cathode drive signal (ELVSS) for the cathode of each light emitting unit in the display panel 101.

[0050] Figure 2 2 shows a cross-sectional view of a display panel 200 provided in an embodiment of the present application. Figure 1The structure of the display panel 200 in the illustrated embodiment may be the same as the structure provided in the embodiment of the present application.

[0051] like Figure 2 As shown, the display panel 200 includes: an upper substrate 201 and a lower substrate 213, and a plurality of laminated structures are arranged between the two substrates to form a plurality of pixel units of the display screen. The upper substrate 201 and the lower substrate 213 are used to encapsulate the internal structure of the display panel 200 and support the structure of the display panel 200. As an example but not a limitation, the material of the substrate includes but is not limited to transparent plastic, glass, etc.

[0052] A transistor in a pixel circuit of each pixel unit formed by a channel layer 212, a source / drain electrode layer 208 and a gate layer 210 is disposed above the lower substrate 213, wherein the channel layer may be a polycrystalline silicon (Poly-Si) layer, and the source / drain electrode layer 208 and the gate layer 210 may be a metal layer. In order to realize a stacked structure of a transistor, optionally, as Figure 2 As shown, a gate insulating layer (GI) 211 and an insulating layer 209 disposed on the gate insulating layer 211 are formed above the channel layer 212, or the insulating layer 209 may also be referred to as an inter-layer insulating layer (ILD). The source / drain layer 208 passes through the GI and the ILD and is connected to the channel layer 212, and the gate layer 210 is disposed in the ILD and is separated from the channel layer 212 by the GI.

[0053] A light-emitting unit in each pixel unit formed by a cathode layer 202, a light-emitting layer 203 and an anode layer 206 is arranged below the upper substrate 201, and one light-emitting unit can correspond to one pixel circuit. When the pixel circuit controls the light-emitting unit to emit light, the cathode layer 202 injects electrons into the circuit, and the anode layer 206 injects holes into the circuit, and the electrons and holes form visible light in the light-emitting layer 203. Optionally, the light-emitting layer 203 can be made of a polymer organic material. In some applications, the cathode layer 202 and the light-emitting layer 203 can be integrally formed and arranged on other laminated structures using an evaporation process.

[0054] Continue to see Figure 2 In addition to the above-mentioned laminated structures, the display panel 200 may further include: an isolation layer 204 , a pixel defining layer 205 and a planarization layer 207 .

[0055] The isolation layer (Polymer Spacer, PS) 204 is used to maintain a preset spacing distance between the upper substrate 201 and other stacked structures, thereby reducing parasitic capacitance and preventing the display panel 200 from generating current crosstalk when powered on, thereby causing display problems. As an example, Figure 2 The isolation layer 204 shown in the figure is disposed below the cathode layer 202 and the light-emitting layer 203. Alternatively, in other examples, the isolation layer 204 may also be disposed above the cathode layer 202 and the light-emitting layer 203. The specific position of the isolation layer 204 is not limited in the embodiment of the present application.

[0056] The pixel defining layer 205 or also called the pixel definition layer (Pixel Define Layer, PDL) is disposed between the light emitting layer 203 and the anode layer 206, and is used to define the position of each pixel unit in the display panel 200 to ensure that the colors of each pixel unit of the display panel 200 do not interfere with each other.

[0057] A planarization layer (PLN) 207 is disposed above the source / drain layer 208. The planarization layer 207 is provided to cover and planarize circuit structures such as transistors, and may be made of an organic insulating material or an inorganic insulating material.

[0058] For the light-emitting layer of the display panel, due to the difference in the characteristics of the organic light-emitting materials or the fluctuation of the process of the organic light-emitting materials (such as the evaporation process, etc.), the display panel is prone to inconsistent pixel lighting in a black screen in a low-temperature environment, a high-temperature environment, or a high-low level switching (sleep in to sleep out) and other conditions. For example, the pixels of the three colors R, G, and B are not lit consistently. For another example, the pixels in different areas of the display panel are not lit consistently. The problem of inconsistent pixel lighting may cause abnormal display of the entire or part of the display panel, such as red, green, blue, etc., which affects the display effect and brings a bad display experience to customers.

[0059] In view of this, an embodiment of the present application provides a display panel that can solve the problem of inconsistent pixel lighting under a black screen and optimize the display effect and user experience of the display panel.

[0060] Figure 3 A schematic diagram of a display panel provided in an embodiment of the present application is shown.

[0061] like Figure 3As shown, the display panel 300 includes: an anode layer 310, a light-emitting layer 320 and a cathode layer 330. The light-emitting layer 320 includes a plurality of light-emitting units 321 (R light-emitting unit, G light-emitting unit and B light-emitting unit are shown in the figure), the anode layer 310 includes a plurality of anode units 311 corresponding to the plurality of light-emitting units 321, and the cathode layer 330 includes a plurality of cathode units 331 arranged separately.

[0062] As an example, in Figure 3 In the embodiment, the plurality of cathode units 331 are respectively connected to light-emitting units of different colors in the display panel 300. In another example, the plurality of cathode units 331 respectively cover light-emitting units in different regions of the display panel 300. In yet another example, each of the plurality of cathode units 331 can be connected to a light-emitting unit of the same color in the display panel 300 and cover a local region of the display panel 300.

[0063] The anode units 311 corresponding to different cathode units 331 among the plurality of cathode units 331 receive different data signals when the display panel 300 displays a black image.

[0064] In the embodiment of the present application, the display panel 300 is provided with a plurality of cathode units 331 separated from each other, rather than an integrated cathode layer covering the entire surface in a conventional solution. The plurality of cathode units 331 may correspond to light-emitting units 321 of different colors in the display panel 300, and / or light-emitting units 321 of different regions in the display panel 300. The plurality of cathode units 331 may support receiving different cathode drive signals.

[0065] In addition, when the display panel displays a black screen, the light-emitting units 321 of different colors corresponding to the plurality of cathode units 331 and / or the anode units 311 connected to the light-emitting units 321 of different regions can be used to receive different data signals. Figure 1 The data driving circuit 130 shown in the figure can provide an original data signal (Vdata), which can be provided to the anode of the light-emitting unit through the pixel circuit in the display panel, thereby driving the light-emitting unit to emit light for display. Unless otherwise specified, the data signal in this application is the signal provided to the anode of the light-emitting unit after the original data signal provided by the data driving chip passes through the pixel circuit.

[0066] The data signal under the black screen can control the brightness of the light-emitting unit in each pixel when the display panel displays the black screen. By providing different black screen data signals to the anode units corresponding to the multiple cathode units 331, the brightness of the light-emitting units 321 of different colors and / or different areas corresponding to the multiple cathode units 331 can be controlled, thereby improving the display effect of different colors or different areas in the display panel under the black screen, so as to improve the problem of inconsistent lighting of the pixels of the display panel under the black screen.

[0067] Through the technical solution of the embodiments of the present application, light-emitting units in different areas and / or different colors in the display panel are respectively provided with respective cathode units, and the anode units corresponding to different cathode units receive different data signals. Therefore, the light-emitting brightness of light-emitting units in different areas and / or different colors corresponding to different cathode units can be adjusted separately, which can effectively solve the problem of inconsistent pixel lighting under black screen, and improve the display effect and user experience of the display panel.

[0068] As an indication, Figure 3 In the embodiment shown, a plurality of stacked sub-cathode layers are provided in the display panel 300. The plurality of sub-cathode layers can be used as a plurality of cathode units 331. Each sub-cathode layer can cover the entire display area of ​​the display panel 300. In order to prevent signal interference between adjacent sub-cathode layers, such as Figure 3 As shown, an insulating layer 341 is provided between adjacent sub-cathode layers, and the plurality of sub-cathode layers can be connected to light-emitting units of different colors in the display panel 300 through via structures. Optionally, the insulating layer 341 can be, for example, an organic insulating layer.

[0069] Optionally, both sides of the sub-cathode layer closest to the light-emitting layer 320 among the multiple sub-cathode layers are provided with an insulating layer 341. In addition, both sides of the sub-cathode layer farthest from the light-emitting layer 320 among the multiple sub-cathode layers may also be provided with an insulating layer 341. The insulating layer 341 can be used to protect the sub-cathode layer.

[0070] The display panel 300 may include three light-emitting units of R, G, and B. In some embodiments, the display panel 300 may be stacked with three sub-cathode layers, and the three sub-cathode layers may be connected to the R light-emitting units, the G light-emitting units, and the B light-emitting units in the display panel 300 in a one-to-one correspondence. In another alternative embodiment, the display panel 300 may also be provided with two sub-cathode layers, one of which may be connected to light-emitting units of two colors, and the other sub-cathode layer may be connected to a light-emitting unit of another color.

[0071] Through the technical solution of the embodiment of the present application, the three-color light-emitting units in the display panel are each provided with an independent sub-cathode layer, which is conducive to separately controlling the light emission of the three-color light-emitting units, thereby better improving the problem of different color pixels in the display panel lighting up at different times.

[0072] Figure 4 A schematic diagram of another display panel provided by an embodiment of the present application is shown.

[0073] like Figure 4 As shown, the display panel 400 includes: an anode layer 410, a light-emitting layer 420 and a cathode layer 430. The light-emitting layer 420 includes a plurality of light-emitting units 421 (R light-emitting unit, G light-emitting unit and B light-emitting unit are shown in the figure), the anode layer 410 includes a plurality of anode units 411 corresponding to the plurality of light-emitting units 421, and the cathode layer 430 includes a plurality of sub-cathode regions 431 arranged in the same layer, the plurality of sub-cathode regions 431 are separated from each other, and the plurality of sub-cathode regions 431 cover the light-emitting units 421 in different regions of the display panel 400.

[0074] Through this technical solution, different areas of the display panel are provided with independent sub-cathode areas, which is conducive to controlling the light emission of different areas separately, thereby better improving the problem that pixels in different areas of the display panel light up at different times.

[0075] In the embodiment of the present application, the number of sub-cathode regions 431 can be flexibly set. Each sub-cathode region 431 can be used as a cathode unit in the display panel 400. When the number of sub-cathode regions 431 is large, it is beneficial to improve the accuracy of controlling the display, thereby better improving the problem of inconsistent lighting of pixels in different regions. However, more sub-cathode regions 431 will also bring more additional wiring, that is, each sub-cathode region 431 requires corresponding wiring to be connected to the power chip. More additional wiring is not conducive to the realization of a narrow frame of the display panel.

[0076] In view of this, in some embodiments, the display panel 400 may include 9 sub-cathode regions 431, and the 9 sub-cathode regions 431 may be distributed in a 3×3 array in the display panel 400. Optionally, the areas of the 9 sub-cathode regions 431 may be the same, or the areas of at least some of the 9 sub-cathode regions 431 may be different.

[0077] In this embodiment, the distribution of the nine sub-cathode regions in the display panel can take into account both the complexity of routing and the improvement of the inconsistent lighting of pixels in the display panel, and can have better overall performance.

[0078] In some alternative implementations, the display panel 400 may also include other numbers of sub-cathode regions 431 , for example, 2, 3, 4, 6, etc. The embodiment of the present application does not limit the specific number of sub-cathode regions 431 provided in the display panel 400 .

[0079] Optionally, in Figure 4 In the illustrated embodiment, an insulating layer 441 may be disposed on both sides of the cathode layer 430 where the plurality of sub-cathode regions 431 are located. The insulating layer 441 may be used to protect the cathode layer 430 .

[0080] Optionally, the cathode layer in the display panel may also be arranged by comprehensively considering the above Figure 3 The embodiments shown and Figure 4 Two options of the embodiment shown.

[0081] Figure 5 A schematic diagram of another display panel provided by an embodiment of the present application is shown.

[0082] like Figure 5 As shown, the display panel 500 includes: an anode layer 510, a light-emitting layer 520 and a cathode layer 530. The light-emitting layer 520 includes a plurality of light-emitting units 521 (R light-emitting units, G light-emitting units and B light-emitting units are shown in the figure), the anode layer 510 includes a plurality of anode units 511 corresponding to the plurality of light-emitting units 521, and the cathode layer 530 includes a plurality of sub-cathode layer groups 532 arranged in the same layer, and the plurality of sub-cathode group layers 532 respectively cover the light-emitting units 521 in different regions of the display panel, and each sub-cathode layer group 532 includes three stacked sub-cathode layers 531, and the three sub-cathode layers 531 are respectively connected to the R light-emitting units, the G light-emitting units and the B light-emitting units in the local region of the display panel 500.

[0083] In the embodiment of the present application, the relevant technical solutions of the three sub-cathode layers 531 in each sub-cathode layer group 532 can be referred to above. Figure 3 The relevant description of the three sub-cathode layers in the embodiment shown. Optionally, as Figure 5 As shown, in each sub-cathode layer group 532, an insulating layer 541 may be disposed between adjacent sub-cathode layers.

[0084] In the embodiment of the present application, the multiple sub-cathode layers 531 in the multiple sub-cathode layer groups 532 may be multiple cathode units in the display panel 500 .

[0085] Through the technical solution of the embodiment of the present application, the problem of inconsistent lighting of different areas and different pixels in the display panel can be comprehensively considered, so that the data signals of the black screen are set respectively for different pixels in different areas of the display panel, so as to better improve the display effect of the display panel.

[0086] With respect to the multiple cathode units of the display panel in the above embodiment, the data signals received by the anode units corresponding to the multiple cathode units when the display panel displays a black image can be controlled by detecting the current time difference of the multiple cathode units.

[0087] Figure 6 A structural diagram of a display screen provided in an embodiment of the present application is shown.

[0088] like Figure 6 As shown, in the display screen 600, the display panel 610 (shown as Panel in the figure) is connected to a current detector 620 (shown as Detector in the figure), and the current detector 620 is used to detect the current time difference of multiple cathode units in the display panel 610. The current time difference is used to control the data signals received by the anode units corresponding to the multiple cathode units when the display panel 610 displays a black screen.

[0089] Optionally, in the embodiment of the present application, the current detector 620 can perform time difference detection on the current of the plurality of cathode units when the display panel 610 displays an initial black screen or a test black screen. The initial black screen can be a black screen displayed when the electronic device where the display screen 600 is located is turned on. The test black screen can be a black screen displayed when the display screen 600 is in the factory test stage.

[0090] After using the initial black screen or the test black screen to perform current time difference detection on multiple cathode units in the display screen 600 to determine the data signals received by the anode units corresponding to the multiple cathode units when the display panel 610 displays a black screen, the subsequent black screen display can use the determined data signal to reduce or avoid the problem of inconsistent pixel lighting that occurs during the subsequent black screen display process.

[0091] Optionally, the current detector 620 may be connected to a plurality of cathode units in the display panel 610 through a plurality of wirings. Figure 3 and Figure 5 In the embodiment shown, the plurality of cathode units are respectively a plurality of sub-cathode layers in the display panel. Figure 4 In the illustrated embodiment, the plurality of cathode units are respectively a plurality of sub-cathode regions in the display panel.

[0092] The plurality of cathode units can be respectively connected to a power chip 640 (shown as a PM IC in the figure) to receive cathode drive signals provided by the power chip 640. Figure 6In the example shown, the plurality of cathode units are respectively a plurality of sub-cathode layers in the display panel, and the power chip 640 can provide three cathode drive signals ELVSS1, ELVSS2, and ELVSS 3 to the three sub-cathode layers respectively connected to the R light-emitting unit, the G light-emitting unit, and the B light-emitting unit in the display panel 610. The three cathode drive signals can be voltage drive signals, and the three sub-cathode layers can generate corresponding current drive signals under the action of the voltage drive signals. Optionally, the three cathode drive signals can be completely the same, partially the same, or completely different.

[0093] Optionally, the current detector 620 may be connected between the power chip 640 and the display panel 610. For example, the current detector 620 may be connected between the power chip 640 and a plurality of cathode units in the display panel 610. This technical solution can facilitate the wiring design between the current detector and the power chip.

[0094] exist Figure 6 In the illustrated embodiment, the current detector 620 can detect the driving currents in the three sub-cathode layers, and determine whether the driving currents in the three sub-cathode layers are synchronized or have a time difference. For example, the driving current in the sub-cathode layer needs to reach the target value to achieve the driving effect of the light-emitting material. The current detector 620 can detect the time when each of the three sub-cathode layers reaches its respective target value, and determine whether the time is synchronized or has a time difference. Optionally, the target value of each of the three sub-cathode layers can be the same or different.

[0095] When the current detector 620 detects that the currents of the three sub-cathode layers are synchronized, the initial black screen data signal can be controlled to be provided to the anode units corresponding to the three sub-cathode layers. Alternatively, when the current detector 620 detects that there is a time difference between the currents of the three sub-cathode layers, the corrected black screen data signal can be controlled to be provided to the anode units corresponding to at least one of the three sub-cathode layers.

[0096] As an example, in the case where there is a current time difference between any two of the three sub-cathode layers, the voltage of the black screen data signal received by the anode unit corresponding to at least one of the two sub-cathode layers is controlled to be a correction voltage, and the correction voltage is K1 times the voltage of the default black screen data signal. K1 may be a value greater than 0. The value of K1 may be determined according to the optical parameters under the black screen, so that the display panel has a better black screen display effect when driven by the corrected black screen data signal.

[0097] When the current of the three sub-cathode layers is driven synchronously, the voltage of the black screen data signal received by the anode unit corresponding to each sub-cathode layer in the three sub-cathode layers is controlled to be an initial voltage, which is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1, and K0 can be a value greater than 0.

[0098] Optionally, in some embodiments, Figure 6 As shown, the current detector 620 can send the detection result of the current time difference to the data driver chip 630 (shown as Data IC in the figure), and the data driver chip 630 can control the original data signal (Vdata) output to the display panel 610 according to the current time difference. The data driver chip 630 can be Figure 1 The data driving circuit in the embodiment shown, the data driving chip 630 can also be called a source driving chip. The data driving chip 630 can provide an original data signal to n columns of data lines (shown as S1 to Sn in the figure) in the display panel 610. After the original data signal passes through the pixel circuit of each pixel in the display panel 610, it forms a data signal and is provided to the anode of the light-emitting unit to drive the light-emitting unit to emit light.

[0099] Optionally, the data driver chip 630 may store initial Vdata and revised Vdata, and when the current detector detects that there is a current time difference between the three sub-cathode layers, the revised Vdata may be provided to the display panel 610, or, when the current detector detects that the current of the three sub-cathode layers is synchronously driven, the initial Vdata may be provided to the display panel 610. The initial Vdata may be K2 times the default Vdata, and the initial Vdata may be K3 times the default Vdata, and K2 and K3 are not equal.

[0100] Optionally, the data driver chip 630 can store multiple groups of corrected Vdata. When it is determined that there is a current time difference among the three sub-cathode layers, it can also be combined with temperature data to select a target group Vdata from the multiple groups of corrected Vdata and provide it to the display panel 610 in a high temperature environment or a low temperature environment.

[0101] Figure 7 A structural diagram of another display screen provided in an embodiment of the present application is shown.

[0102] like Figure 7As shown, in the display screen 700, 9 sub-cathode areas 711 are provided in the display panel 710 (shown as Panel in the figure), and the 9 sub-cathode areas 711 can be connected to a current detector 720 (shown as Detector in the figure) through wiring (not shown in the figure) on the display panel 710. The current detector 720 is used to detect the current time difference of the 9 sub-cathode areas 711 in the display panel 710, and the current time difference is used to control the data signal received by the anode units corresponding to the 9 sub-cathode areas 711 when the display panel 710 displays a black screen.

[0103] The power chip 740 can provide 9 cathode drive signals ELVSS1 to ELVSS9 to the 9 cathode sub-regions 711 respectively. The 9 cathode drive signals can be voltage drive signals, and the 9 cathode sub-regions 711 can generate corresponding current drive signals under the action of the voltage drive signals. Optionally, the 9 cathode drive signals can be completely the same, partially the same, or completely different. Optionally, the current detector 720 can be connected between the power chip 740 and the display panel 710.

[0104] exist Figure 7 In the illustrated embodiment, the current detector 720 can detect the driving currents in the nine sub-cathode regions 711 and determine whether the driving currents in the nine sub-cathode regions 711 are synchronized or have a time difference. The determination process can be referred to above. Figure 6 The relevant description of the illustrated embodiment will not be repeated here.

[0105] When the current detector 720 detects that the currents of the nine sub-cathode regions 711 are synchronized, the initial black screen data signal can be controlled to be provided to the anode units corresponding to the nine sub-cathode regions 711. Alternatively, when the current detector 720 detects that there is a time difference in the currents of the nine sub-cathode regions 711, the corrected black screen data signal can be controlled to be provided to the anode units corresponding to at least one of the nine sub-cathode regions 711. The relevant technical solutions of the initial black screen data signal and the corrected black screen data signal can also be found in the above Figure 6 For the sake of brevity, the relevant description of the illustrated embodiment will not be repeated here.

[0106] Alternatively, if Figure 7 As shown, the current detector 720 can send the detection result of the current time difference to the data driving chip 730 (shown as Data IC in the figure), and the data driving chip 730 can control the data signal output to the display panel 710 according to the current time difference.

[0107] Optionally, the data driver chip 730 may store initial Vdata and revised Vdata, and when the current detector detects that there is a current time difference in the nine sub-cathode regions 711, the revised Vdata may be provided to the display panel 710, or, when the current detector detects that the current of the nine sub-cathode regions 711 is synchronously driven, the initial Vdata may be provided to the display panel 710. In some embodiments, the data driver chip 730 may also store multiple sets of revised Vdata.

[0108] In the above Figure 6 and Figure 7 In the embodiment shown, the multiple cathode units in the display panel are taken as an example of three sub-cathode layers or nine sub-cathode regions. In alternative embodiments, the multiple cathode units in the display panel may also be other numbers of sub-cathode regions, or, for example, Figure 5 As shown, it may be sub-cathode layers distributed in different areas of the display panel and respectively connected to different colors.

[0109] In addition, in the above embodiment, in order to solve the problem of inconsistent pixel lighting, the anode units corresponding to different cathode units among the multiple cathode units of the display panel receive different data signals when the display panel displays a black screen. In addition to this method, when the display panel displays a black screen, the cathode drive signals received by different cathode units among the multiple cathode units of the display panel can also be different, thereby solving the problem of inconsistent pixel lighting.

[0110] In some embodiments, the current detector may be used to detect a current time difference of the plurality of cathode units, and the current time difference is used to control cathode driving signals received by the plurality of cathode units when the display panel displays a black picture.

[0111] In some embodiments, a current detector is connected to a power chip, which is used to send the current time difference of multiple cathode units to the power chip, so that the power chip controls the cathode drive signals received by the multiple cathode units when the display panel displays a black screen according to the current time difference.

[0112] Combination of the above Figures 3 to 7 The related structures of the display panel and the display screen provided by the present application are described. Figure 8 , describing the control method of the display panel provided by the present application. The control method in the following embodiments can be applied to a control device of a display panel, and the control device can be, for example, a data driver chip in the above embodiments. The relevant schemes in the following embodiments can refer to the relevant description of the data driver chip in the above embodiments, and the similarities will not be described in detail below.

[0113] Figure 8A flowchart of a method for controlling a display panel provided in an embodiment of the present application is shown.

[0114] like Figure 8 As shown, the control method 800 of the display panel may include the following steps.

[0115] S810: Obtaining a current time difference of a plurality of cathode units separately arranged in the display panel, wherein the plurality of cathode units are respectively connected to light-emitting units of different colors of the display panel, and / or the plurality of cathode units respectively cover light-emitting units in different areas of the display panel.

[0116] S820: Outputting data signals when the display panel displays a black screen to the anode units corresponding to the plurality of cathode units according to the current time difference of the plurality of cathode units.

[0117] For the above S820, in some embodiments, when there is a current time difference between any two cathode units among the plurality of cathode units, the control device may output a modified black screen data signal to the anode unit corresponding to at least one cathode unit among the two cathode units, and the voltage of the modified black screen data signal is K1 times the voltage of the default black screen data signal. When the currents of the plurality of cathode units are synchronously driven, the control device may output an initial black screen data signal to the anode units corresponding to the plurality of cathode units, and the voltage of the initial black screen data signal is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1.

[0118] For the above S810, in some embodiments, the control device may obtain the current time difference of multiple cathode units detected by a current detector, wherein the current detector may be arranged between the display panel and a power chip for driving the multiple cathode units in the display panel.

[0119] In some embodiments, the control device may obtain the current time difference of the plurality of cathode units in the display panel when the display panel displays an initial black screen and / or a test black screen, wherein the initial black screen is a black screen displayed by the display panel when the display panel is turned on, and the test black screen is a black screen displayed by the display panel during the factory test phase. And the control device may output data signals when the display panel displays subsequent black screens to the anode units corresponding to the plurality of cathode units according to the current time difference of the plurality of cathode units.

[0120] The present application also provides a control device for a display panel. The control device may include a processor and an interface circuit. The interface circuit may be connected to the display panel. The processor is used to execute the above Figure 8 The control method in any possible implementation manner in the illustrated embodiment. The control device may be, for example, a data driver chip.

[0121] The present application also provides a display device, including: a control device and a display panel, wherein the display panel can be the above Figures 1 to 7 The control device may include the control device in any of the above embodiments.

[0122] Optionally, the display device may include a current detector in addition to the control device and the display panel. The current detector in the embodiment of the present application and the above related embodiments may be, for example, a current detection chip.

[0123] In addition, the display device may further include a power chip. The power chip, the current detection chip, and the data drive chip may be arranged on the same circuit board, or may be arranged separately on different circuit boards.

[0124] In the embodiment of the present application, the display device may also be a display screen or an electronic device including a display screen.

[0125] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0126] The term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists, A and B exist at the same time, and B exists.

[0127] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0128] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0129] If the functions provided by the embodiments of the present application are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0130] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: an anode layer, a light-emitting layer and a cathode layer, wherein the light-emitting layer includes a plurality of light-emitting units, the anode layer includes a plurality of anode units corresponding to the plurality of light-emitting units, the cathode layer includes a plurality of cathode units arranged separately, the plurality of cathode units are respectively connected to light-emitting units of different colors in the display panel, and / or the plurality of cathode units respectively cover light-emitting units in different areas of the display panel; The anode units corresponding to different cathode units among the plurality of cathode units receive different data signals when the display panel displays a black picture.

2. The display panel according to claim 1, characterized in that: The plurality of cathode units include a plurality of stacked sub-cathode layers, an insulating layer is disposed between two adjacent sub-cathode layers in the plurality of sub-cathode layers, and the plurality of sub-cathode layers are respectively connected to light-emitting units of different colors in the display panel through via structures.

3. The display panel according to claim 2, characterized in that: The plurality of sub-cathode layers include three sub-cathode layers, and the three sub-cathode layers are respectively connected to a red light emitting unit, a blue light emitting unit, and a green light emitting unit in the display panel.

4. The display panel according to claim 1, characterized in that: The plurality of cathode units include a plurality of sub-cathode regions arranged in the same layer, and the plurality of sub-cathode regions respectively cover light-emitting units in different regions of the display panel.

5. The display panel according to claim 4, characterized in that: The plurality of sub-cathode regions are distributed in the display panel in a 3×3 array.

6. The display panel according to claim 1, characterized in that: The multiple cathode units include multiple sub-cathode layers, which include multiple groups of sub-cathode layers. The multiple groups of sub-cathode layers respectively cover light-emitting units in different areas of the display panel, and each group of sub-cathode layers includes three stacked sub-cathode layers, which are respectively connected to red light-emitting units, blue light-emitting units and green light-emitting units in local areas of the display panel.

7. The display panel according to any one of claims 1 to 6, characterized in that: The plurality of cathode units are connected to a current detector for detecting a current time difference of the plurality of cathode units, and the current time difference is used to control a data signal received by anode units corresponding to the plurality of cathode units when the display panel displays a black picture.

8. The display panel according to claim 7, characterized in that: The current detector is connected to the data driving chip, and is used to send the current time difference of the multiple cathode units to the data driving chip, so that the data driving chip controls the data signals received by the anode units corresponding to the multiple cathode units when the display panel displays a black picture according to the current time difference.

9. The display panel according to claim 7, characterized in that: The current detector is connected between the plurality of cathode units and a power chip for driving the plurality of cathode units.

10. The display panel according to claim 7, characterized in that: In the case where there is a current time difference between any two cathode units among the plurality of cathode units, an anode unit corresponding to at least one cathode unit among the any two cathode units is used to receive a modified black screen data signal, wherein a voltage of the modified black screen data signal is K1 times a voltage of a default black screen data signal; or, When the currents of the plurality of cathode units are synchronously driven, the anode units corresponding to the plurality of cathode units are used to receive an initial black screen data signal, the voltage of which is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1.

11. The display panel according to claim 7, characterized in that: The current detector is used to detect the current time difference of the multiple cathode units when the display panel displays an initial black screen and / or a test black screen, wherein the initial black screen is a black screen displayed by the display panel when it is turned on, and the test black screen is a black screen displayed by the display panel during the factory testing stage.

12. The display panel according to any one of claims 1 to 6, characterized in that: When the display panel displays a black picture, the plurality of cathode units are used to respectively receive a plurality of different cathode driving signals.

13. A method for controlling a display panel, characterized in that: include: Acquiring a current time difference of a plurality of cathode units separately arranged in the display panel, wherein the plurality of cathode units are respectively connected to light-emitting units of different colors of the display panel, and / or the plurality of cathode units respectively cover light-emitting units in different areas of the display panel; According to the current time difference of the plurality of cathode units, the data signal of the display panel when displaying a black picture is output to the anode units corresponding to the plurality of cathode units.

14. The control method according to claim 13, characterized in that: The method of controlling the data signals received by the anode units corresponding to the plurality of cathode units when the display panel displays a black picture according to the current time difference of the plurality of cathode units comprises: In the case where there is a current time difference between any two cathode units among the plurality of cathode units, a modified black screen data signal is output to an anode unit corresponding to at least one cathode unit among the any two cathode units, wherein the voltage of the modified black screen data signal is K1 times the voltage of the default black screen data signal; or When the currents of the plurality of cathode units are synchronously driven, an initial black screen data signal is output to the anode units corresponding to the plurality of cathode units, and the voltage of the initial black screen data signal is K0 times the voltage of the default black screen data signal, wherein K0 is not equal to K1.

15. The control method according to claim 13, characterized in that: The step of obtaining the current time difference of a plurality of cathode units separately arranged in the display panel comprises: The current time difference of the plurality of cathode units detected by a current detector is obtained, wherein the current detector is disposed between the display panel and a power chip for driving the plurality of cathode units in the display panel.

16. The control method according to any one of claims 13 to 15, characterized in that: The step of obtaining the current time difference of a plurality of cathode units separately arranged in the display panel comprises: When the display panel displays an initial black screen and / or a test black screen, obtaining a current time difference of the plurality of cathode units in the display panel, wherein the initial black screen is a black screen displayed when the display panel is turned on, and the test black screen is a black screen displayed when the display panel is performing a factory test; The step of outputting the data signal of the display panel when displaying a black screen to the anode units corresponding to the plurality of cathode units according to the current time difference of the plurality of cathode units comprises: According to the current time difference of the plurality of cathode units, data signals when the display panel displays a subsequent black picture are output to the anode units corresponding to the plurality of cathode units.

17. A control device for a display panel, characterized in that: include: A processor and an interface circuit, wherein the interface circuit is connected to the display panel, and the processor is used to execute the control method according to any one of claims 13 to 16.

18. A display device, characterized in that: The invention comprises: a control device, and a display panel according to any one of claims 1 to 12, wherein the control device is used to input a data signal to the display panel to control the display of the display panel.

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