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

Abstract

The application 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 plurality of light-emitting units. The cathode layer comprises a plurality of cathode units arranged separately. The plurality of cathode units are connected to light-emitting units of different colors in the display panel respectively, and / or the plurality of cathode units cover light-emitting units in different areas of the display panel respectively. 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. The technical scheme can solve the problem of inconsistent pixel brightness of the display panel under a black picture, and improve the display effect and user experience of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, and more particularly, to a display panel, a control method of the display panel, a control device and a display device. BACKGROUND

[0002] Due to the self-luminous characteristic, the organic light-emitting diode (OLED) display screen does not need a backlight source, can realize a thinner and lighter design, and at the same time provides a wider viewing angle and a faster response time, and thus is widely applied in various fields such as smart phones, televisions, wearable devices and the like. However, in the development process of the OLED display screen, due to various factors such as process deviation of a light-emitting material, aging speed, environmental temperature change and the like, a problem of inconsistent pixel light-up under a black picture of the display screen can occur. The problem can cause color deviation and visual unevenness of the display screen and the like, and brings a poor visual experience to consumers.

[0003] In view of this, how to solve the problem of inconsistent pixel light-up under a black picture of the display screen is a technical problem to be solved in the field. SUMMARY

[0004] The present application provides a display panel, a control method of the display panel, a control device and a display device, and can solve the problem of inconsistent pixel light-up under a black picture of the display panel, 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 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 regions of the display panel; and 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.

[0006] According to the technical scheme of the present application, the light-emitting units in different regions and / or of 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, so that the light-emitting brightness of the light-emitting units in different regions and / or of different colors corresponding to different cathode units can be adjusted respectively, the problem of inconsistent pixel light-up under a black picture of the display screen can be effectively solved, and the display effect and user experience of the display panel are improved.

[0007] In some possible implementation manners, the plurality of cathode units include a plurality of sub-cathode layers arranged in a stack, an insulating layer is arranged between any two adjacent sub-cathode layers in the plurality of sub-cathode layers, and the plurality of sub-cathode layers are connected to light-emitting units of different colors in the display panel through via structures respectively.

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

[0009] By the technical scheme of this implementation manner, the three colors of light-emitting units in the display panel are each correspondingly provided with an independent sub-cathode layer, which is conducive to controlling the light emission of the three colors of light-emitting units respectively, thereby preferably improving the problem that different color pixels in the display panel do not light up at the same time.

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

[0011] By the technical scheme of this implementation manner, different regions of the display panel are provided with independent sub-cathode regions, which is conducive to controlling the light emission of different regions respectively, thereby preferably improving the problem that different regions of pixels in the display panel do not light up at the same time.

[0012] In some possible implementation manners, the plurality of sub-cathode regions are arranged in a 3*3 array in the display panel.

[0013] In this implementation manner, the distribution of the nine sub-cathode regions in the display panel can take into account the complexity of the wiring and the improvement of the inconsistent light-up of pixels in the display panel, and can have better comprehensive performance.

[0014] In some possible implementation manners, 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 cover light-emitting units in different regions of the display panel respectively, and each group of sub-cathode layers includes three sub-cathode layers arranged in a stack, and the three sub-cathode layers are connected to red light-emitting units, blue light-emitting units and green light-emitting units in a local region of the display panel respectively.

[0015] By the technical scheme of this implementation manner, the inconsistent light-up problems of different regions and different pixels in the display panel can be considered comprehensively, so that data signals of black pictures are set for different pixels in different regions of the display panel, thereby preferably improving the display effect of the display panel.

[0016] In some possible implementation manners, the plurality of cathode units are connected to a current detector, and the current detector is configured to detect a current time difference of the plurality of cathode units, and the current time difference is configured to control data signals received by the anode units corresponding to the plurality of cathode units when the display panel displays a black image.

[0017] In this implementation manner, the current detector can conveniently detect the current time difference of the plurality of cathode units, and the data signals of different colors and / or different regions of the display panel can be adjusted when the display panel displays a black image.

[0018] In some possible implementation manners, the current detector is connected to a data driving chip, and the current detector is configured to send the current time difference of the plurality of 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 plurality of cathode units when the display panel displays a black image according to the current time difference.

[0019] In some possible implementation manners, the current detector is connected between the plurality of cathode units and a power supply chip configured to drive the plurality of cathode units. Through this technical solution, the wiring design between the current detector and the power supply chip can be facilitated.

[0020] In some possible implementation manners, in a case where there is a current time difference between any two cathode units of the plurality of cathode units, the anode unit corresponding to at least one cathode unit of the any two cathode units is configured to receive a corrected black image data signal, and a voltage of the corrected black image data signal is K1 times a voltage of a default black image data signal; or in a case where the plurality of cathode units are synchronously driven, the anode units corresponding to the plurality of cathode units are configured to receive an initial black image data signal, and a voltage of the initial black image data signal is K0 times the voltage of the default black image data signal, where K0 and K1 are not equal.

[0021] In some possible implementation manners, the current detector is configured to detect the current time difference of the plurality of cathode units when the display panel displays an initial black image and / or a test black image, where the initial black image is a black image displayed by the display panel when the display panel is powered on, and the test black image is a black image displayed by the display panel in a factory test stage.

[0022] Through the technical solution of this implementation manner, the current time difference of the plurality of cathode units is detected when the display panel displays the test black image and / or the initial black image, and then the data signals of the anode units corresponding to the plurality of cathode units are adjusted, which is beneficial to improve the accuracy of the data signal adjustment and preferably improves the problem of inconsistent pixel light-up.

[0023] In some possible implementation manners, when the display panel displays a black image, the plurality of cathode units are configured to respectively receive a plurality of different cathode driving signals.

[0024] By the technical solution of the embodiment, the different cathode driving signals can also adjust the luminous brightness of the light-emitting units of different regions and / or different colors corresponding to different cathode unit, thereby solving the problem of inconsistent pixel light-up in a black picture of the display screen, and improving the display effect and user experience of the display panel.

[0025] In a second aspect, a control method of a display panel is provided, including: obtaining current time differences 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 cover light-emitting units in different regions of the display panel; and outputting, according to the current time differences of the plurality of cathode units, data signals of the display panel when displaying a black picture to anode units corresponding to the plurality of cathode units.

[0026] In some possible embodiments, the control method further includes: in a case where there is a current time difference between any two cathode units of the plurality of cathode units, outputting, to anode units corresponding to at least one cathode unit of the any two cathode units, a corrected black picture data signal, a voltage of the corrected black picture data signal being K1 times of a voltage of a default black picture data signal; or in a case where the plurality of cathode units are synchronously driven, outputting, to anode units corresponding to the plurality of cathode units, an initial black picture data signal, a voltage of the initial black picture data signal being K0 times of the voltage of the default black picture data signal, where K0 and K1 are not equal.

[0027] In some possible embodiments, the obtaining of the current time differences of the plurality of cathode units separately arranged in the display panel includes: obtaining the current time differences of the plurality of cathode units detected by a current detector, where the current detector is arranged between the display panel and a power supply chip used to drive the plurality of cathode units in the display panel.

[0028] In some possible embodiments, the obtaining of the current time differences of the plurality of cathode units separately arranged in the display panel includes: obtaining the current time differences of the plurality of cathode units in a case where the display panel displays an initial black picture and / or a test black picture, where the initial black picture is a black picture displayed by the display panel when starting up, and the test black picture is a black picture displayed by the display panel in a factory test stage; and the outputting of the data signals of the display panel when displaying a black picture to anode units corresponding to the plurality of cathode units according to the current time differences of the plurality of cathode units includes: outputting, according to the current time differences of the plurality of cathode units, data signals of the display panel when displaying a subsequent black picture to anode units corresponding to the plurality of cathode units.

[0029] In a third aspect, a control device of a display panel is provided, comprising: a processor and an interface circuit, the interface circuit being connected to the display panel, and the processor being configured 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: the control device, and the display panel in the first aspect or any possible implementation manner of the first aspect, the control device being configured to input a data signal to the display panel to control display of the display panel. BRIEF DESCRIPTION OF DRAWINGS

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

[0032] Figure 2 FIG. 2 is a sectional view of a display panel provided by an embodiment of the present application.

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

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

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

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

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

[0038] Figure 8 FIG. 8 is a flowchart of a control method of a display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the present application will be described below with reference to the drawings.

[0040] The present application relates to a display screen. The display screen can be applied to various fields and scenarios. As an example, the display screen can be applied to 3C electronic products of Computer, Communication and Consumer Electronics, including but not limited to television, mobile phone, computer, notebook computer, tablet computer, Personal Digital Assistant (PDA), vehicle-mounted computer, wearable device, game device, shooting device, etc. The present application does not limit the specific type of electronic device in which the display screen is located.

[0041] In addition, the display screen involved in the present application can be an OLED display screen, a Low Temperature Poly-silicon (LTPS) OLED display screen, an oxide OLED display screen, a Mirco OLED display screen, and the like. 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 by an embodiment of the present application is shown.

[0043] As shown in Figure 1 The display screen 100 can 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, which can be arranged into N rows and M columns according to actual needs to form a display area of the display screen 100 and present different display effects of pictures.

[0044] For an OLED display screen, each pixel unit 111 can include an independent light-emitting unit and a pixel circuit for controlling the light-emitting unit. The light-emitting unit can include red (R), green (G), and blue (B) organic light-emitting materials, which are driven by a current to emit light and form color pixels. The pixel circuit can include a switching tube and a capacitor, and the state of the switching tube can be controlled by a control signal to effectively drive the light-emitting unit.

[0045] For other types of display screens, each pixel unit 111 has a pixel circuit to control the light-emitting of each pixel unit 111. The scan driving circuit 120 and the data driving circuit 130 can be connected to each pixel unit 111 in the pixel array 110 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 driving 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 driving 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] Optionally, as shown in Figure 1As shown, the display screen 100 can further include a timing control circuit 140, which can also be referred to as a timer control register (TCON), and which can be connected to the scan driving circuit 120 and / or the data driving circuit 130. The timing control circuit 140 can receive a display control signal, and control the working timing of the scan driving circuit 120 and / or the data driving circuit 130 according to the display control signal, and can control the display data of the data driving circuit 130, wherein the display control signal can include, but is not limited to, a power signal, an image signal, a mode control signal, and the like.

[0047] In some embodiments of the present application, the data driving circuit 130 can be a source driver or a source driver IC, and the data driving circuit 130 can be separately arranged from the display panel 101 on which the pixel array 110 is arranged. The display panel 101 can have different structures according to different types of the display screen 100, but generally, the substrate of the display panel is a transparent substrate such as glass or plastic, and the pixel circuit of the pixel array 110 can be formed on the substrate through a semiconductor process, and then the light-emitting unit of the pixel array 110 can be formed by cooperating with other components, so as to form the main part of the display screen 100, i.e., the display panel 101. The specific structure of the display panel 101 can refer to the specific description of the related art, and will not be described in detail here.

[0048] In some embodiments of the present application, the scan driving circuit 120 can be a gate driver or a gate driver IC which is independent of the display panel 101. Alternatively, as shown, the scan driving circuit 120 can also be integrated in the display panel 101, and the scan driving circuit 120 can be referred to as a GOA circuit, which can be synchronously prepared on the transparent substrate with the pixel circuit of the pixel array 110, so as to simplify the manufacturing process of the display screen 100. Figure 1

[0049] In addition to the scan driving circuit 120, the data driving circuit 130, and the timing control circuit 140 and the like control circuits for controlling the light-emitting of the display panel, the display screen 100 can further include a power supply circuit 150, which can provide a power supply signal for the display panel 101. Alternatively, the power supply circuit 150 can be a power supply IC. Alternatively, the power supply circuit 150 can provide a cathode driving signal (ELVSS) for the cathode of each light-emitting unit in the display panel 101.

[0050] Figure 2 A cross-sectional view of a display panel 200 provided by an embodiment of the present application is shown. Alternatively, the display panel 200 can be the display panel 101 shown in FIG. 1, and the display panel 200 can be a display panel of a display screen 100 of a different type. Figure 1 ​The display panel 200 in the illustrated embodiment can have the same structure as provided in the embodiments of the present application.

[0051] As shown in Figure 2 , the display panel 200 includes an upper substrate 201 and a lower substrate 213, and a plurality of stacked structures are arranged between the two substrates to form a plurality of pixel units of a 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. By way of example and not 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 is arranged above the lower substrate 213 and formed by a channel layer 212, a source / drain layer 208, and a gate layer 210. The channel layer can be a polycrystalline silicon (Poly-Si) layer, and the source / drain layer 208 and the gate layer 210 can be metal layers. To realize the stacked structure of the transistor, the gate insulator layer (GI) 211 and the insulating layer 209 arranged above the gate insulator layer 211 are formed above the channel layer 212, as shown in Figure 2 . The source / drain layer 208 is connected to the channel layer 212 through the GI and the ILD, and the gate layer 210 is arranged in the ILD and spaced from the channel layer 212 by the GI.

[0053] A light emitting unit in each pixel unit is arranged below the upper substrate 201 and formed by a cathode layer 202, a light emitting layer 203, and an anode layer 206. 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. The electrons and the holes form visible light in the light emitting layer 203. Optionally, the light emitting layer 203 can be made of a high-molecular organic material. In some applications, the cathode layer 202 and the light emitting layer 203 can be integrally formed and arranged on other stacked structures by an evaporation process.

[0054] Continuing to refer to Figure 2 , in addition to the above-mentioned stacked structures, the display panel 200 can further include an isolation layer 204, a pixel definition layer 205, and a planarization layer 207.

[0055] The isolation layer 204 shown in FIG. 2 is arranged below the cathode layer 202 and the light-emitting layer 203, or in some other examples, the isolation layer 204 can also be arranged above the cathode layer 202 and the light-emitting layer 203. The specific position of the isolation layer 204 is not limited in the embodiments of the present application. Figure 2 The isolation layer 204 shown in FIG. 2 is arranged below the cathode layer 202 and the light-emitting layer 203, or in some other examples, the isolation layer 204 can also be arranged above the cathode layer 202 and the light-emitting layer 203. The specific position of the isolation layer 204 is not limited in the embodiments of the present application.

[0056] The pixel define layer 205, also known as the pixel definition layer (PDL), is arranged 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, so as to ensure that the colors of the pixel units in the display panel 200 do not interfere with each other.

[0057] The planarization layer 207 is arranged above the source / drain layer 208, and the planarization layer 207 is arranged to cover the circuit structure such as the transistor and make it flat, and an organic insulating material or an inorganic insulating material can be used.

[0058] For the light-emitting layer of the display panel, due to the difference in characteristics of the organic light-emitting material or the process fluctuation (such as evaporation process, etc.) of the organic light-emitting material, in the case of low-temperature environment, high-temperature environment, or high-low step switching (sleep in to sleep out), etc., the display panel is prone to have inconsistent pixel light-up in a black picture. For example, the R, G, and B pixels have inconsistent light-up, and for example, the pixels in different regions of the display panel have inconsistent light-up, etc. The inconsistent pixel light-up problem can cause the display panel to have abnormal display on the whole or in part, such as red, green, and blue, etc., which affects the display effect and brings bad display experience to the customer.

[0059] In view of this, the embodiments of the present application provide a display panel, which can solve the problem of inconsistent pixel light-up in a black picture, and optimize the display effect and user experience of the display panel.

[0060] Figure 3 FIG. 1 shows a schematic diagram of a display panel provided by an embodiment of the present application.

[0061] As shown in FIG. 1, the display panel 200 includes an upper substrate 201, a lower substrate 202, a light-emitting layer 203, a pixel define layer 205, an anode layer 206, a source / drain layer 208, and an isolation layer 204. 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, G, and B light-emitting units 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 the display panel 300, the plurality of cathode units 331 are respectively connected to light-emitting units of different colors. 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 light-emitting units of the same color in the display panel 300 and cover a partial region of the display panel 300. Figure 3

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

[0064] In the embodiments of the present application, the display panel 300 is provided with a plurality of cathode units 331 arranged separately, instead of a conventional integral cathode layer covering the entire surface. The plurality of cathode units 331 can respectively correspond to light-emitting units 321 of different colors in the display panel 300 and / or light-emitting units 321 in different regions of the display panel 300. The plurality of cathode units 331 can support receiving different cathode driving signals.

[0065] In addition, when the display panel displays a black image, anode units 311 connected to light-emitting units 321 of different colors and / or light-emitting units 321 in different regions corresponding to the plurality of cathode units 331 can be used to receive different data signals. A data driving chip (for example, the data driving circuit 130 shown) of the display panel can provide original data signals (Vdata), which can be provided to anodes of light-emitting units through pixel circuits in the display panel, so as to drive the light-emitting units to emit light and display. Except for special descriptions, the data signal in the present application is a signal provided to anodes of light-emitting units after original data signals provided by a data driving chip pass through pixel circuits. Figure 1

[0066] ​​The data signal under the black picture can control the luminance of the light emitting unit in each pixel when the display panel displays a black picture. By providing different black picture data signals to the anode units corresponding to the plurality of cathode units 331, the luminance of the light emitting units 321 of different colors and / or different regions corresponding to the plurality of cathode units 331 can be controlled, thereby improving the display effect of different colors or different regions in the display panel under a black picture, to improve the problem of inconsistent pixel light-up in the display panel under a black picture.

[0067] By the technical solutions of the embodiments of the present application, the light emitting units of different regions and / or different colors in the display panel are respectively provided with corresponding cathode units, and the anode units corresponding to different cathode units receive different data signals, so that the luminance of the light emitting units of different regions and / or different colors corresponding to different cathode units can be adjusted respectively, which can effectively solve the problem of inconsistent pixel light-up in the display screen under a black picture, and improve the display effect and user experience of the display panel.

[0068] As an example, in the embodiment shown in Figure 3 In the display panel 300, a plurality of sub-cathode layers are provided in a stacked manner. The plurality of sub-cathode layers can serve 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, as shown in Figure 3 The adjacent sub-cathode layers are provided with an insulating layer 341, and the plurality of sub-cathode layers can be connected to the light emitting units of different colors in the display panel 300 through a via structure. Alternatively, the insulating layer 341 can be an organic insulating layer, for example.

[0069] Alternatively, the two sides of the sub-cathode layer closest to the light emitting layer 320 in the plurality of sub-cathode layers are provided with an insulating layer 341. In addition, the two sides of the sub-cathode layer farthest from the light emitting layer 320 in the plurality of sub-cathode layers can 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 can include R, G, and B light emitting units. In some embodiments, the display panel 300 can be provided with three layers of sub-cathode layers, and the three layers of sub-cathode layers can be respectively connected to the R light emitting units, the G light emitting units, and the B light emitting units in the display panel 300 one by one. In another alternative embodiment, the display panel 300 can also be provided with two layers of sub-cathode layers, and one of the two layers of sub-cathode layers can be connected to light emitting units of two colors, and the other sub-cathode layer can be connected to light emitting units of another color.

[0071] Through the technical solutions of the embodiments of the present application, the three colors of the light emitting units in the display panel are each correspondingly provided with an independent sub-cathode layer, which is conducive to separately controlling the light emission of the three colors of the light emitting units, thereby preferably improving the problem that different color pixels in the display panel do not light up at the same time.

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

[0073] As shown in Figure 4 , 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, G, and B light emitting units are shown in the diagram), 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 the technical solutions, the different regions of the display panel are provided with independent sub-cathode regions, which is conducive to separately controlling the light emission of the different regions, thereby preferably improving the problem that the pixels in different regions of the display panel do not light up at the same time.

[0075] In the embodiments of the present application, the number of the sub-cathode regions 431 can be flexibly set. Each sub-cathode region 431 can serve as an anode unit in the display panel 400. In the case that the number of the sub-cathode regions 431 is large, it is conducive to improving the accuracy of display control, thereby preferably improving the problem that the pixels in different regions light up inconsistently. However, a large number of sub-cathode regions 431 will also bring about a large number of additional wirings, i.e., each sub-cathode region 431 needs to be connected to the power chip through a corresponding wiring. A large number of additional wirings is not conducive to the realization of a narrow frame of the display panel.

[0076] Therefore, in some embodiments, the display panel 400 can include nine sub-cathode regions 431, which can be arranged in a 3x3 array in the display panel 400. Alternatively, the areas of the nine sub-cathode regions 431 can be the same, or the areas of at least some of the nine sub-cathode regions 431 can be different.

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

[0078] In some alternative embodiments, the display panel 400 can also include other numbers of sub-cathode regions 431, for example, 2, 3, 4, 6, etc. The embodiments of the present application are not limited to the specific number of sub-cathode regions 431 provided in the display panel 400.

[0079] Optionally, in the display panel 400, the sub-cathode regions 431 can be arranged in a matrix form. Figure 4 In the embodiments shown, the cathode layer 430 where the plurality of sub-cathode regions 431 are located can be provided with an insulating layer 441. The insulating layer 441 can be used to protect the cathode layer 430.

[0080] Optionally, the arrangement of the cathode layer in the display panel can also take into comprehensive consideration the above-mentioned Figure 3 two schemes of the embodiments shown in Figure 4 the embodiments shown in

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

[0082] As shown in Figure 5 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, G, and B light-emitting units are shown in the diagram), 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, the plurality of sub-cathode layer groups 532 respectively cover the light-emitting units 521 in different regions of the display panel, and each sub-cathode layer group 532 includes three sub-cathode layers 531 arranged in a stack, the three sub-cathode layers 531 are respectively connected to the R, G, and B light-emitting units in a local region of the display panel 500.

[0083] In the embodiments of the present application, the technical solutions of the three sub-cathode layers 531 in each sub-cathode layer group 532 can refer to the above-mentioned Figure 3 related descriptions of the three sub-cathode layers in the embodiments shown in Figure 5 Optionally, in each sub-cathode layer group 532, an insulating layer 541 can be arranged between adjacent sub-cathode layers.

[0084] In the embodiments of the present application, the plurality of sub-cathode layers 531 in the plurality of sub-cathode layer groups 532 can be a plurality of cathode units in the display panel 500.

[0085] Through the technical solutions of the embodiments of the present application, the inconsistent light-on problems of different regions and different pixels in the display panel can be taken into comprehensive consideration, and the data signals of the black picture can be respectively set for different pixels in different regions of the display panel, so as to preferably improve the display effect of the display panel.

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

[0087] Figure 6 This illustration shows an architecture diagram of a display screen provided in an embodiment of this application.

[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). 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 signal received by the anode units corresponding to the multiple cathode units when the display panel 610 displays a black screen.

[0089] Optionally, in this embodiment, the current detector 620 can perform time-difference detection on the current of multiple cathode units when the display panel 610 displays an initial black screen or a test black screen. The initial black screen can be the black screen displayed when the electronic device containing the display screen 600 is powered on. The test black screen can be the black screen displayed during the factory testing phase of the display screen 600.

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

[0091] Optionally, the current detector 620 can be connected to multiple cathode units in the display panel 610 via multiple traces. (As stated above...) Figure 3 and Figure 5 In the illustrated embodiment, the multiple cathode units are respectively multiple sub-cathode layers in the display panel, as described above. Figure 4 In the illustrated embodiment, the multiple cathode units are multiple sub-cathode regions in the display panel.

[0092] These multiple cathode units can be individually connected to the power supply chip 640 (shown as PM IC in the figure) to receive cathode drive signals provided by the power supply chip 640. Figure 6In the shown example, the plurality of cathode units are respectively a plurality of sub-cathode layers in the display panel, and the power supply chip 640 can provide three cathode driving signals ELVSS1, ELVSS2, and ELVSS3 to 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 driving signals can be voltage driving signals, and the three sub-cathode layers can generate corresponding current driving signals under the action of the voltage driving signals. Alternatively, the three cathode driving signals can be completely the same, partially the same, or completely different.

[0093] Alternatively, the current detector 620 can be connected between the power supply chip 640 and the display panel 610. For example, the current detector 620 can be connected between the power supply chip 640 and the plurality of cathode units in the display panel 610. Through this technical solution, the wiring design between the current detector and the power supply chip can be facilitated.

[0094] In Figure 6 In the shown 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 a target value to achieve the driving effect of the light-emitting material, and the current detector 620 can detect the time at which each of the three sub-cathode layers reaches the respective target value to determine whether the times are synchronized or have a time difference. Alternatively, the target values of each of the three sub-cathode layers can be the same or different.

[0095] In the case where 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, in the case where the current detector 620 detects that the currents of the three sub-cathode layers have a time difference, 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 units corresponding to at least one of the any two sub-cathode layers is a modified voltage, which is K1 times the voltage of the default black screen data signal. Wherein K1 can be a value greater than 0. The value of K1 can be determined according to the optical parameters under the black screen, so that the display panel has a better black screen display effect under the driving of the modified black screen data signal.

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

[0098] Alternatively, in some implementations, such as 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). The data driver chip 630 can control the output of the raw data signal (Vdata) to the display panel 610 based on the current time difference. The data driver chip 630 can... Figure 1 The data driving circuit in the illustrated embodiment, the data driving chip 630, can also be referred to as a source driving chip. The data driving chip 630 provides raw data signals to the n columns of data lines (shown as S1 to Sn in the figure) in the display panel 610. After passing through the pixel circuit of each pixel in the display panel 610, the raw data signals form data signals that are 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 an initial Vdata and a corrected Vdata. When the current detector detects a current time difference among the three sub-cathode layers, the corrected Vdata can be provided to the display panel 610. Alternatively, when the current detector detects synchronous current driving of the three sub-cathode layers, the initial Vdata can be provided to the display panel 610. The initial Vdata can be K2 times the default Vdata, or K3 times the default Vdata, where K2 and K3 are not equal.

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

[0101] Figure 7 An architectural diagram of another display provided in an embodiment of this application is shown.

[0102] like Figure 7As shown, in the display screen 700, the display panel 710 (shown as Panel in the figure) is provided with 9 sub-cathode areas 711. The 9 sub-cathode areas 711 can be connected to the current detector 720 (shown as Detector in the figure) through the 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. The current time difference is used to control the data signal received by the anode unit corresponding to the 9 sub-cathode areas 711 when the display panel 710 displays a black screen.

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

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

[0105] When the current detector 720 detects that the currents of the nine sub-cathode regions 711 are synchronized, an initial black screen data signal can be provided to the anode unit corresponding to each of the nine sub-cathode regions 711. Alternatively, when the current detector 720 detects a time difference in the currents of the nine sub-cathode regions 711, a corrected black screen data signal can be provided to the anode unit corresponding to at least one of the nine sub-cathode regions 711. Related technical solutions for the initial black screen data signal and the corrected black screen data signal can also be found above. Figure 6 For the sake of brevity, the relevant descriptions of the embodiments shown will not be elaborated upon here.

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

[0107] Optionally, the data driving chip 730 can store the initial Vdata and the corrected Vdata. When the current detector detects that the currents of the nine sub-cathode regions 711 are different, the data driving chip 730 can provide the corrected Vdata to the display panel 710. When the current detector detects that the currents of the nine sub-cathode regions 711 are synchronously driven, the data driving chip 730 can provide the initial Vdata to the display panel 710. In some embodiments, the data driving chip 730 can also store a plurality of sets of corrected Vdata.

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

[0109] In addition, in the above embodiments, in order to solve the problem of inconsistent pixel light-up, the anode units corresponding to different cathode units in the plurality of cathode units of the display panel receive different data signals when the display panel displays a black image. In addition to this method, the cathode driving signals received by different cathode units in the plurality of cathode units of the display panel can also be different when the display panel displays a black image, thereby solving the problem of inconsistent pixel light-up.

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

[0111] In some embodiments, the current detector is connected to the power supply chip, and the current detector is used to send the current difference of the plurality of cathode units to the power supply chip, so that the power supply chip controls the cathode driving signals received by the plurality of cathode units when the display panel displays a black image according to the current difference.

[0112] The above describes the related structures of the display panel and the display screen provided by the present application. The following describes the control method of the display panel provided by the present application in combination with Figures 3 to 7 . The control method in the following embodiments can be applied to the control device of the display panel, which can be, for example, the data driving chip in the above embodiments. The related solutions in the following embodiments can refer to the related description of the data driving chip in the above embodiments, and the same parts will not be described in detail. Figure 8

[0113] Figure 8 ​A flow chart of a control method of a display panel is shown.

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

[0115] S810: Obtain current time differences 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 regions of the display panel.

[0116] S820: According to the current time differences of the plurality of cathode units, output data signals of the display panel when displaying a black screen to anode units corresponding to the plurality of cathode units.

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

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

[0119] In some embodiments, the control device can obtain the current time differences of the plurality of cathode units in the display panel in the case that 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 starting up, and the test black screen is a black screen displayed by the display panel in a factory test stage. And the control device can output data signals of the display panel when displaying a subsequent black screen to anode units corresponding to the plurality of cathode units according to the current time differences of the plurality of cathode units.

[0120] The embodiments of the present application also provide a control device of a display panel, which can include a processor and an interface circuit, the interface circuit can be connected with the display panel, and the processor is used to execute the control method in any possible implementation manner of the above Figure 8 embodiments. The control device can be, for example, a data driving chip.

[0121] The display device can also include a control device and a display panel. The display panel can be the display panel in any of the above embodiments. The control device can include the control device in any of the above embodiments. Figures 1 to 7 The display device can also include a control device and a display panel. The display panel can be the display panel in any of the above embodiments. The control device can include the control device in any of the above embodiments.

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

[0123] In addition, the display device can also include a power supply chip. The power supply chip, the current detection chip, the data driving chip, and the like can be disposed on the same circuit board, or can be separately disposed on different circuit boards.

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

[0125] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily exclude other embodiments from being claimed as alternatives. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0126] In the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A, the existence of A and B, and the existence of B.

[0127] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

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

[0129] If the functions provided by the embodiments of the present application are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[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 can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A display panel, characterized in that, include: The display panel includes 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 separately disposed cathode units, 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 screen.

2. The display panel according to claim 1, characterized in that, The plurality of cathode units include a plurality of sub-cathode layers stacked together, with an insulating layer disposed between two adjacent 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 a via structure.

3. The display panel according to claim 2, characterized in that, The plurality of sub-cathode layers includes three sub-cathode layers, which are respectively connected to the red light-emitting unit, the blue light-emitting unit, and the 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 on the same layer, and the plurality of sub-cathode regions respectively cover the light-emitting units in different areas of the display panel.

5. The display panel according to claim 4, characterized in that, The multiple sub-cathode regions are arranged in a 3×3 array in the display panel.

6. The display panel according to claim 1, characterized in that, 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 the light-emitting units in different areas of the display panel, and each group of sub-cathode layers includes three sub-cathode layers stacked together, the three sub-cathode layers respectively connected to the red light-emitting unit, the blue light-emitting unit and the green light-emitting unit in a local area 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, which is used to detect the current time difference of the plurality of cathode units. The current time difference is used to control the data signal received by the anode unit corresponding to the plurality of cathode units when the display panel displays a black screen.

8. The display panel according to claim 7, characterized in that, The current detector is connected to the data driver chip. The current detector is used to send the current time difference of the plurality of cathode units to the data driver chip, so that the data driver chip controls the data signal received by the anode units corresponding to the plurality of cathode units when the display panel displays a black screen 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 the power chip used to drive the plurality of cathode units.

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

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

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

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

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

15. The control method according to claim 13, characterized in that, The step of obtaining the current time difference of the multiple cathode units separately arranged in the display panel includes: The current time difference of the plurality of cathode units detected by the current detector is obtained, wherein the current detector is disposed between the display panel and the 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 the multiple cathode units separately arranged in the display panel includes: When the display panel displays an initial black screen and / or a test black screen, the current time difference of the plurality of cathode units in the display panel is obtained, wherein the initial black screen is the black screen displayed when the display panel is powered on, and the test black screen is the black screen displayed when the display panel is undergoing factory testing. The step of outputting the data signal of the display panel when displaying a black screen to the corresponding anode unit of the plurality of cathode units according to the current time difference of the plurality of cathode units includes: Based on the current time difference of the plurality of cathode units, the data signal for the subsequent black screen displayed on the display panel is output to the anode unit 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, the interface circuit being connected to the display panel, the processor being configured to execute the control method as described in any one of claims 13 to 16.

18. A display device, characterized in that, It includes: a control device, and a display panel as claimed in any one of claims 1 to 12, wherein the control device is configured to input data signals to the display panel to control the display of the display panel.

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