Display panel, driving method thereof, and display device

Abstract

The present disclosure provides a display panel and a driving method thereof, and a display device. The display panel comprises a substrate, a pixel definition layer, a light emitting device layer, an encapsulation layer and a black matrix layer which are sequentially stacked on one side of the substrate. The pixel definition layer comprises a plurality of sub-pixel openings. The light emitting device layer comprises a light emitting device corresponding to each of the sub-pixel openings. The black matrix layer comprises a plurality of black matrix openings which are arranged one by one corresponding to the sub-pixel openings. An electrochromic structure is arranged in an edge region of the black matrix opening. The electrochromic structure comprises a first electrode, an electrochromic layer and a second electrode which are sequentially stacked away from the substrate.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display. More particularly, it relates to a display panel and a driving method thereof, and a display device. BACKGROUND

[0002] With the continuous progress of automobile technology, the vehicle display screen has become an important component indispensable to modern cars. As a key interface for human-computer interaction, the vehicle display screen not only improves the convenience and entertainment of driving, but also greatly enriches the driving experience by displaying driving information, navigation routes, entertainment content, etc.

[0003] OLED display devices are widely used in the field of vehicle display due to their wide color gamut, bright colors, and the ability to be curved or full-screen. However, in actual use, a significant problem exists with vehicle instrument panels, which is that the light emitted by the vehicle instrument panel is easily reflected on the front windshield, which not only distracts the driver's attention, but also may block the driver's view, affecting driving safety. SUMMARY

[0004] The purpose of the present disclosure is to provide a display panel and a driving method thereof, and a display device, to solve the technical problem of interference caused by the image reflection on the windshield by the vehicle display screen in the related art.

[0005] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0006] The first aspect of the present disclosure provides a display panel, comprising a substrate, a pixel definition layer, a light emitting device layer, an encapsulation layer and a black matrix layer stacked in sequence on one side of the substrate, the pixel definition layer comprising a plurality of sub-pixel openings, the light emitting device layer comprising a light emitting device corresponding to each sub-pixel opening, the black matrix layer comprising a plurality of black matrix openings, the black matrix openings being arranged one-to-one corresponding to the sub-pixel openings, wherein an electrochromic structure is arranged in an edge region of the black matrix opening, the electrochromic structure comprising a first electrode, an electrochromic layer and a second electrode stacked in sequence away from the substrate.

[0007] Optionally, the orthographic projection of the black matrix opening on the substrate covers the orthographic projection of the sub-pixel opening on the substrate, and the orthographic projection of the electrochromic structure on the substrate does not overlap with the orthographic projection of the sub-pixel opening on the substrate.

[0008] Optionally, the black matrix opening comprises a first region, a second region and a third region arranged in sequence along the first direction, a projection of the second region on the substrate substrate overlaps with a projection of the sub-pixel opening on the substrate substrate, and at least one of the first region and the third region is provided with the electrochromic structure in a region of the front windshield.

[0009] Optionally, one of the first electrode and the second electrode comprises a plurality of sub-electrodes, and a projection of the electrochromic layer on the substrate substrate covers a projection of the plurality of sub-electrodes on the substrate substrate.

[0010] Optionally, for each electrochromic structure, the other one of the first electrode and the second electrode is connected in series to form a mesh structure.

[0011] Optionally, the display panel has a display area and first and second frame areas arranged on opposite sides of the display area, one of the first and second frame areas is a binding area, and each sub-electrode of the plurality of sub-electrodes extends from the display area to the other one of the first and second frame areas to form a plurality of voltage input terminals.

[0012] Optionally, the light emitting device layer comprises light emitting devices of different colors, and each sub-electrode in the electrochromic structure corresponding to each light emitting device of the same color is connected in series one by one.

[0013] Optionally, the display panel further comprises a first driving circuit arranged in the other one of the first and second frame areas, the first driving circuit comprises a driving control unit and a plurality of sub-driving units, the driving control unit comprises a first output terminal and a second output terminal, and for any sub-driving unit, the sub-driving unit comprises a first transistor and a first capacitor, a gate of the first transistor is connected to the second output terminal, a source of the first transistor is connected to the first output terminal, a drain of the first transistor is connected to a first end of the first capacitor and a voltage input terminal, and a second end of the first capacitor is connected to a first voltage signal.

[0014] Optionally, the electrochromic structure further comprises a first insulating layer arranged between the first electrode and the second electrode.

[0015] Optionally, the display panel further comprises:

[0016] a color filter layer, the color filter layer comprising a plurality of color filters, the color filters covering at least the black matrix opening; and / or

[0017] a touch layer, the touch layer being arranged between the encapsulation layer and the black matrix layer.

[0018] The second aspect of the present disclosure provides a driving method of a display panel, comprising the following steps:

[0019] obtaining the brightness information of the ambient light;

[0020] calculating the driving voltage required by the electrochromic structure in the display panel according to the brightness information of the ambient light;

[0021] applying the driving voltage to each electrochromic structure to adjust the brightness of the target viewing angle range of the display panel to be consistent with the brightness of the ambient light, the target viewing angle range being the light-emitting viewing angle range corresponding to the electrochromic structure.

[0022] The third aspect of the present disclosure provides a display device comprising the display panel as described above.

[0023] The beneficial effects of the present disclosure are as follows:

[0024] The display panel of the embodiment of the present disclosure is provided with an electrochromic structure in the edge region of the black matrix opening in the black matrix layer, the electrochromic structure comprising a first electrode, an electrochromic layer and a second electrode stacked in sequence in the direction away from the substrate. When the display panel is applied to a vehicle display screen, different driving voltages can be applied to the electrochromic layer according to the brightness information of the ambient light, the color and transmittance of the electrochromic layer change with the different driving voltages, and then the brightness of the light emitted by the light-emitting device in the large viewing angle range also changes. By adjusting the driving voltage, the brightness of the light in the large viewing angle range of the display panel can be adjusted towards the brightness of the ambient light, so that the image reflection on the windshield is consistent with the brightness of the ambient light, and the interference of the image reflection on the driver can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] The specific embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of the scene of the reflection of the vehicle display screen on the windshield in the related art;

[0027] Figure 2 A schematic diagram of the planar structure of the display panel provided by the embodiment of the present disclosure;

[0028] Figure 3 A schematic diagram of the planar structure of the display panel provided by the embodiment of the present disclosure; Figure 2 A cross-sectional schematic diagram of an embodiment of the display area AA along the C-C' direction;

[0029] Figure 4 A cross-sectional schematic diagram of an embodiment of the display area AA along the C-C' direction; Figure 3A schematic diagram of the electroluminescent structure arranged in the first region and the third region simultaneously;

[0030] Figure 5 A distribution schematic diagram of the first electrode of the light-emitting device provided by the embodiment of the present disclosure;

[0031] Figure 6 A distribution schematic diagram of the second electrode provided by the embodiment of the present disclosure;

[0032] Figure 7 A circuit structure schematic diagram of the first driving circuit provided by the embodiment of the present disclosure;

[0033] Figure 8 A flowchart of the preparation method of the display panel provided by the embodiment of the present disclosure;

[0034] Figure 9 A flowchart of the driving method of the display panel provided by the embodiment of the present disclosure;

[0035] Figure 10 A principle schematic diagram of the electrochromic structure dimming provided by the embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present disclosure.

[0037] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as the common meaning thereof by those of ordinary skill in the art to which the present disclosure belongs. The terms “first”, “second” and similar terms used in the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. Similarly, the terms “one”, “an” or “the” and similar terms do not represent a quantity limitation, but represent the existence of at least one. The terms “include” or “contain” and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms “connect” or “connected” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “up”, “down”, “left”, “right” and the like only represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0038] Reference is made to Figure 1, Figure 1 This is a diagram illustrating the reflection of a vehicle's display screen on the windshield. Figure 1 As shown, the light emitted by the vehicle's display screen can easily create image reflections on the windshield, especially in scenarios where there is a significant difference between the ambient light and the display screen's light, such as at night or in low-light conditions. Specifically, a portion of the light emitted by the vehicle's display screen (e.g., the light from a specific viewing angle) can cause reflections. Figure 1 Light rays within the triangular area will directly enter the human eye. A portion of the light rays will travel through the area below the human eye (not shown in the diagram), while a portion of the light rays 1 will illuminate the windshield and be reflected off the surface of the windshield. The reflected light 2 will then enter the human eye. At the same time, ambient light 3 will also pass through the windshield and enter the human eye. If there is a significant difference in brightness and color between ambient light 3 and reflected light 2, the image reflection on the windshield will be prominent, obstructing the driver's vision and causing interference to the driver, posing a very high safety hazard.

[0039] To address the aforementioned technical problems, this disclosure provides a display panel, please refer to the figures. Figure 2 This is a schematic diagram of the planar structure of the display panel provided in an embodiment of the present disclosure, as shown below. Figure 2 As shown, the display panel includes a display area AA and a first frame area B11 and a second frame area B12 disposed on both sides of the display area AA along the first direction Y. When the display panel is applied to a vehicle instrument panel, the first frame area B11 is closer to the windshield of the vehicle, and the second frame area B12 is closer to the driver.

[0040] in, Figure 3 for Figure 2 A schematic diagram of the film structure in the central display area AA along the C-C' cross-sectional line, as shown below. Figure 3 As shown, the display panel includes a substrate 10, a pixel defining layer 11, a light-emitting device layer 12, an encapsulation layer 13, and a black matrix layer 14, which are sequentially stacked on one side of the substrate. The pixel defining layer 11 includes a plurality of sub-pixel openings 111. The light-emitting device layer 12 includes light-emitting devices 121 that correspond one-to-one with the sub-pixel openings 111. The black matrix layer 14 includes a plurality of black matrix openings 141, which are arranged one-to-one with the sub-pixel openings 111. An electrochromic structure 15 is provided in the edge region of the black matrix opening 141. The electrochromic structure 15 includes a first electrode 151, an electrochromic layer 152, and a second electrode 153, which are sequentially stacked along a path away from the substrate 10.

[0041] The black matrix opening 141 is arranged corresponding to the sub-pixel opening 111, that is, one sub-pixel opening 111 corresponds to one black matrix opening 141, and the sub-pixel opening 111 is located corresponding to the black matrix opening 141. For example, the orthographic projection of the black matrix opening 141 on the substrate 10 covers the orthographic projection of the sub-pixel opening 111 on the substrate 10.

[0042] Optionally, the projection center of the orthographic projection of the black matrix opening 141 on the substrate 10 overlaps the projection center of the orthographic projection of the sub-pixel opening 111 on the substrate 10, that is, the center of the black matrix opening 141 and the center of the sub-pixel opening 111 are located on the vertical line of the substrate 10.

[0043] The black matrix opening 141 is defined by the adjacent black matrix (BM) 142. The black matrix opening 141 can be understood as being composed of a central region and an edge region surrounding the central region. The central region can be understood as a region corresponding to the sub-pixel opening 111 or a local region where the center of the sub-pixel is located. The edge region can be understood as a region closer to the black matrix 142 in the black matrix opening 141.

[0044] In the embodiment of the present disclosure, the orthographic projection of the black matrix opening 141 on the substrate 10 covers the orthographic projection of the sub-pixel opening 111 on the substrate 10, and the orthographic projection of the electrochromic structure 15 on the substrate 10 does not overlap the orthographic projection of the sub-pixel opening 111 on the substrate 10.

[0045] Optionally, the black matrix opening 141 includes a first region 141a, a second region 141b and a third region 141c distributed in sequence along the first direction Y. The orthographic projection of the second region 141b on the substrate 10 overlaps the orthographic projection of the sub-pixel opening 111 on the substrate 10, and the electrochromic structure 15 is arranged in the first region 141a and / or the third region 141c.

[0046] For example, as shown in FIG. 1, the orthographic projection of the black matrix opening 141 on the substrate 10 covers the orthographic projection of the sub-pixel opening 111 on the substrate 10. Figure 3As shown, in the first direction Y parallel to the substrate 10, the second area 141b corresponds to the position of the sub-pixel opening 111, which can be understood as the central area of the black matrix opening 111, and the first area 141a and the third area 141c are respectively located on both sides of the second area 141b, the first area 141a can also be understood as BM out1, and the third area 141c can also be represented as BM out2, wherein the first area 141a and the third area 141c can be understood as the edge area of the black matrix opening 141. It can be understood that the size of the second area 141b can also be slightly larger than the size of the sub-pixel opening 111, and at this time, the size of the first area 141a and the third area 141c is relatively reduced.

[0047] The electrochromic structure 15 arranged in the edge area of the black matrix opening 141 can include various cases, for example, the electrochromic structure 15 can be arranged only in the first area 141a, or as shown in Figure 3 The electrochromic structure 15 can be arranged only in the third area 141c, or as shown in Figure 4 The electrochromic structure 15 can be arranged in the first area 141a and the third area 141c.

[0048] When the electrochromic structure 15 is arranged in different areas, the light emitted in different viewing angles can be adjusted. Taking the display panel shown in Figure 3 As an example, as shown in Figure 3 In the C-C' direction, the light emitted by the third area 141c will be emitted to the front windshield, that is, as shown in Figure 1 The light 1 is transmitted in the direction, and the light emitted by the first area 141a is closer to the driver and will not enter the front windshield. Therefore, when the electrochromic structure 15 is arranged in the third area 141c, the image reflection on the front windshield can be adjusted, and when the electrochromic structure 15 is arranged in the first area 141a, the light in the area below the human eye can be adjusted. In the embodiment of the present disclosure, the electrochromic structure 15 can be arranged only in the third area 141c, or the electrochromic structure 15 can be arranged in the third area 141c and the first area 141a.

[0049] Optionally, the electrochromic structure 15 is arranged in at least one area of the first area 141a and the third area 141c, wherein the light emitted by the area is directed to the front windshield.

[0050] The first region 141a and the third region 141c are provided with the electrochromic structure 15 in the region where the light is emitted towards the front windshield, that is, for the first region 141a and the third region 141c, when the display panel is used as a vehicle display screen, the electrochromic structure 15 is arranged in the region where the light is emitted towards the front windshield. As shown in FIG. 13, in the C-C' direction, the light emitted by the third region 141c is towards the front windshield, and the light emitted by the first region 141a is towards the driver, that is, away from the front windshield, so the electrochromic structure 15 is arranged in the third region 141c, and the brightness of the image reflection can be adjusted at this time. Figure 3

[0051] In the embodiments of the present disclosure, for any electrochromic structure 15, when different driving voltages are applied to the electrochromic layer 152 through the first electrode 151 and the second electrode 153, the electrochromic layer 152 can be switched between multiple colors and transmittances. By switching the electrochromic layer 152 between different transmittances, the light emitted by the display panel can be adjusted.

[0052] Specifically, the electrochromic layer 152 is a transparent coating layer that changes color after a voltage is applied, for example, to blue, gray, and other colors, and returns to transparent when the direction is reversed. After the electrochromic layer 152 changes color, its transmittance also changes. Specifically, in the colored state, the electrochromic layer can absorb more visible light, resulting in a decrease in transmittance, and in the decolored state (i.e., transparent state), the electrochromic material reduces the absorption of visible light, and the transmittance increases. By controlling the size and direction of the applied electric field, the diffusion rate and direction of ions in the electrochromic layer 152 can be adjusted, thereby accurately controlling the color and transmittance of the electrochromic layer 151.

[0053] It can be understood that in the embodiments of the present disclosure, the electrochromic material is used to adjust the brightness of the light emitted by the large viewing angle range of the light emitting device in the display panel when different voltages are applied, without limiting the specific material of the electrochromic material and its transmittance state at different driving voltages.

[0054] ​Compared with the related art, the display panel of the embodiment of the present disclosure sets the electrochromic structure in the edge region of the black matrix opening in the black matrix layer, the electrochromic structure includes a first electrode, an electrochromic layer and a second electrode which are sequentially stacked in the direction away from the substrate substrate, when the display panel is applied to a vehicle-mounted display screen, different driving voltages can be applied to the electrochromic layer according to the bright chrominance information of the ambient light, the color and the light transmission state of the electrochromic layer change with the different driving voltages, and then the bright chrominance of the light emitted by the light emitting device in the large viewing angle range also changes, and by adjusting the driving voltage, the bright chrominance of the light in the large viewing angle range of the display panel can be adjusted towards the bright chrominance of the ambient light, so that the image reflection on the front windshield tends to be consistent with the bright chrominance of the ambient light, and the interference of the image reflection on the driver can be reduced.

[0055] In a possible implementation manner, as Figure 3 The display panel further includes:

[0056] The color film layer 16 includes a plurality of color filters, the color filters at least cover the black matrix openings 141; and / or

[0057] The touch layer 17 is arranged between the encapsulation layer 13 and the black matrix layer 14.

[0058] For example, when the light emitting device layer 12 includes red light emitting devices R, green light emitting devices G and blue light emitting devices B, the color film layer 16 includes red color filters R-CF, green color filters G-CF and blue color filters B-CF, and the red color filters R-CF are arranged one by one corresponding to the red light emitting devices R, the green color filters G-CF are arranged one by one corresponding to the green light emitting devices G, and the blue color filters B-CF are arranged one by one corresponding to the blue light emitting devices B.

[0059] The color filter at least covering the black matrix opening 141 can include various cases: (1) the orthographic projection of the color filter on the substrate substrate 10 overlaps the orthographic projection of the black matrix opening 141 on the substrate substrate 10, that is, the color filter just covers the black matrix opening 141, at this time, the electrochromic structure 15 is arranged between the touch layer 17 and the color filter, and the electrochromic structure 15 is covered by the color filter; (2) the orthographic projection of the color filter on the substrate substrate 10 covers the orthographic projection of the black matrix opening 141 on the substrate substrate 10, and the orthographic projection of each color filter on the substrate substrate 10 constitutes the entire display area, as shown in Figure 6 The color filter covers the black matrix opening 141, and the color filters of adjacent sub-pixels are adjacent above the black matrix 142.

[0060] For example, the touch layer 17 includes a buffer layer, a first touch electrode layer TMA, an insulating layer TLD, a second touch electrode layer TMB, and a touch protection layer TOC, which are sequentially stacked along a direction away from the substrate 10. For example, the buffer layer may be formed using an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride; the insulating layer TLD may be formed using an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride; and the touch protection layer TOC may include an inorganic insulating material or an organic insulating material.

[0061] In one possible implementation, one of the first electrode and the second electrode includes a plurality of sub-electrodes, and the orthographic projection of the electrochromic layer on the substrate covers the orthographic projection of the plurality of sub-electrodes on the substrate.

[0062] Optional, such as Figure 5 As shown, the first electrode 151 includes a plurality of sub-electrodes 1511, and the orthographic projection of the electrochromic layer 152 on the substrate 10 covers the orthographic projection of the plurality of sub-electrodes 1511 on the substrate 10.

[0063] For example, the number of sub-electrodes 1511 can be 2, 3, 4 or more. This disclosure does not limit the number of sub-electrodes 1511, and only describes the example of 3 sub-electrodes 1511, that is, each first electrode 151 includes 3 sub-electrodes 1511.

[0064] The first electrode 151 and the second electrode 153 are made of transparent conductive materials, such as indium tin oxide (ITO). Alternatively, they can be nickel oxide (NiO) or other semiconductor transparent materials. Optionally, the plurality of sub-electrodes 1511 are arranged in parallel. Figure 4 As shown, the first electrode 151 includes three sub-electrodes 1511 that are parallel to each other.

[0065] For any electrochromic structure 15, when the first electrode 151 includes three sub-electrodes 1511, the electrochromic structure 15 can be understood as being divided into three sub-electrochromic structures. The three sub-electrochromic structures are independent of each other. On the one hand, each sub-electrochromic structure can be subjected to a different voltage to change the light transmission state of the sub-electrochromic structure, thereby changing the light transmission effect at the position of the sub-electrochromic structure. On the other hand, each sub-electrochromic structure can be subjected to the same or different voltages. Through the above two aspects, a more refined dimming effect can be achieved.

[0066] Optionally, for each electrochromic structure, one of the first electrode and the second electrode is connected in series to form a mesh structure.

[0067] As shown in Figure 6 When the first electrode 151 includes a plurality of sub-electrodes 1511, the second electrode 153 is an integral structure, and the second electrodes 153 of each electrochromic structure 15 are connected in series to form a mesh structure. For the mesh structure, since the current can be shunted through multiple paths, the current density on each trace can be reduced, thereby reducing the resistance and heat generation. This design helps to reduce the load in the second electrode 153 and the second connection trace, and improves the display performance and stability.

[0068] It can be understood that in the embodiments of the present disclosure, the second electrode 153 can also include a plurality of sub-electrodes, and the first electrode 151 is an integral structure, and the first electrodes 151 of each electrochromic structure 15 are connected in series to form a mesh structure.

[0069] In a possible implementation, the display panel has a display area AA and first and second frame areas arranged on opposite sides of the display area AA, one of the first and second frame areas is a binding area, and each of the plurality of sub-electrodes extends from the display area into the other of the first and second frame areas to form a plurality of voltage input ends.

[0070] In the embodiments of the present disclosure, the display panel has a binding area, which is usually used for binding with an external flexible circuit board. Assuming that the binding area is the second frame area B12 as shown in Figure 2 In the embodiments of the present disclosure, the first electrode 151 extends into the binding area opposite side (i.e., the first frame area B11) to form a voltage input end, which is used for binding with the driving circuit of the electroluminescent structure 15 and applying different voltages to the first electrode 151 under the control of the driving circuit. Specifically, when the first electrode 151 includes a plurality of sub-electrodes 1511, each sub-electrode 1511 extends into the first frame area B11 to form a voltage input end of the plurality of sub-electrodes 1511. Similarly, when the binding area is the first frame area B11 as shown in Figure 2 In the embodiments of the present disclosure, the first electrode 151 extends into the binding area opposite side (i.e., the first frame area B11) to form a voltage input end, which is used for binding with the driving circuit of the electroluminescent structure 15 and applying different voltages to the first electrode 151 under the control of the driving circuit. Specifically, when the first electrode 151 includes a plurality of sub-electrodes 1511, each sub-electrode 1511 extends into the first frame area B11 to form a voltage input end of the plurality of sub-electrodes 1511. Similarly, when the binding area is the first frame area B11 as shown in

[0071] In a possible implementation, the light emitting device layer includes light emitting devices of different colors, and each sub-electrode in the corresponding electrochromic structure of each light emitting device of the same color is connected in series one by one.

[0072] For example, the light emitting device layer 12 includes first, second, and third color light emitting devices, where the first color light emitting device can be a red light emitting device R, the second color light emitting device can be a green light emitting device G, and the third color light emitting device can be a blue light emitting device B.

[0073] Please refer to Figure 5 For example, assuming that the first electrode 151 in the electrochromic structure 15 corresponding to the red light emitting device R includes three sub-electrodes 1511, respectively denoted as R1, R2, and R3, the first electrode 151 in the electrochromic structure 15 corresponding to the green light emitting device G includes three sub-electrodes, respectively denoted as G1, G2, and G3, and the first electrode 151 in the electrochromic structure 15 corresponding to the blue light emitting device B includes three sub-electrodes, respectively denoted as B1, B2, and B3, each sub-electrode in the electrochromic structure corresponding to each light emitting device of the same color is connected in series one-to-one, that is, in the first electrode at the position of each red light emitting device R, the sub-electrode R1 is connected in series, the sub-electrode R2 is connected in series, and the sub-electrode R3 is connected in series, in the first electrode at the position of each green light emitting device G, the sub-electrode G1 is connected in series, the sub-electrode G2 is connected in series, and the sub-electrode G3 is connected in series, and in the first electrode at the position of each blue light emitting device B, the sub-electrode B1 is connected in series, the sub-electrode B2 is connected in series, and the sub-electrode B3 is connected in series. Therefore, for each electrochromic structure 15 in the display panel, nine voltage input ends are formed.

[0074] Optionally, as shown in Figure 7 The display panel further includes a first driving circuit 18, which is arranged in the other of the first and second frame regions. The first driving circuit 18 includes a driving control unit 181 and a plurality of sub-driving units 182. The driving control unit 181 includes a first output end and a second output end. For any sub-driving unit 182, the sub-driving unit 182 includes a first transistor and a first capacitor. The gate electrode G of the first transistor is connected to the second output end. The source electrode S of the first transistor is connected to the first output end. The drain electrode D of the first transistor is connected to the first end of the first capacitor and one voltage input end. The second end of the first capacitor is connected to a first voltage signal.

[0075] For example, the second frame region B12 is a binding region, and the first driving circuit 18 is arranged in the first frame region B11.

[0076] In the embodiments of the present disclosure, the number of sub-driving units 182 is the same as the number of voltage input ends, and one sub-driving unit 182 is connected to one voltage input end. For example, assuming that the light emitting device layer 12 includes red light emitting devices, green light emitting devices, and blue light emitting devices, and the first electrode includes three sub-electrodes, the first driving circuit 18 includes nine sub-driving units 182, each of which is connected to a voltage input end to input a voltage to the corresponding sub-electrode R1, R2, R3, G1, G2, G3, B1, B2, and B3. For example, as shown in Figure 7As shown, in the sub driving unit 182 connected with the sub electrode B1, the first transistor is denoted as MUX1, the first capacitor is denoted as C1, and the first voltage signal is a constant voltage VDD. It should be noted that, Figure 1 The second end of each first capacitor is connected with the first voltage signal, which is not shown in the figure.

[0077] The driving control unit 181 can be a driving IC, and is connected with the ambient light sensor, can receive the ambient light information detected by the ambient light sensor, and calculate the driving voltage output to each sub electrode R1, R2, R3, G1, G2, G3, B1, B2, B3 according to the ambient light information.

[0078] In a specific implementation, the second output end of the driving control unit 181 is connected with the gate G of the first transistor in each sub driving unit 182, and the driving control unit 181 outputs the gate control signal to the gate of the first transistor in each sub driving unit 182 in time division, that is, in different time periods, the gate control signal is applied to different sub driving units 182, that is, different sub driving units 182 are turned on in different time periods. It should be noted that, Figure 7 In the figure, only the second output end of the driving control unit 181 is connected with the gate G of the first transistor in one of the sub driving units 182, but in an actual product, the second output end of the driving control unit 181 is connected with the gate G of the first transistor in each sub driving unit 182, and each sub driving unit 182 is controlled to be turned on in time division. Among them, the first capacitor is used to maintain the potential in the corresponding sub electrode, for example, in time division control, when the gate control signal is first output to the sub driving unit 182 corresponding to the sub electrode B1, that is, the sub electrode B1 is turned on, the voltage of the first capacitor and the drain of the first transistor is consistent, and when the gate control signal is switched to the sub driving unit 182 corresponding to the sub electrode B2, although the first transistor in the sub driving unit 182 corresponding to the sub electrode B1 is disconnected, due to the existence of the first capacitor, the first capacitor will continue to apply the driving voltage to the sub electrode B1, and the same applies to the subsequent.

[0079] The first output end of the driving control unit 181 is connected with the source S of the first transistor in each sub driving unit 182, which is used to output the color change control voltage to the sub driving unit 182 in the on state, so that the drain D of the sub driving unit 182 can apply the driving voltage corresponding to the color change control voltage to the corresponding sub electrode.

[0080] In the embodiment of the present disclosure, the first driving circuit can realize the application of different driving voltages to different sub driving units through time division control, so as to adjust the color change and light transmission of the electrochromic structure corresponding to each sub electrode.

[0081] From Figure 5 ,Figure 6 and Figure 7 It can be seen that the display panel includes a plurality of red light emitting devices R, a plurality of green light emitting devices G, and a plurality of blue light emitting devices B, for each red light emitting device R, the driving voltages applied by each sub-electrode of the electrochromic structure corresponding to the red light emitting device R are the same, that is, the driving voltages applied by each sub-electrode R1 are the same, the driving voltages applied by each sub-electrode R2 are the same, and the driving voltages applied by each sub-electrode R3 are the same, so that the sub-electrochromic structures corresponding to each sub-electrode R1 have the same color change condition, and by analogy, the sub-electrochromic structures corresponding to each sub-electrode R2 have the same color change condition, and the sub-electrochromic structures corresponding to each sub-electrode R3 have the same color change condition. By analogy, for each green light emitting device G, the driving voltages applied by each sub-electrode in the electrochromic structure corresponding to the green light emitting device G are also the same; and for each green light emitting device B, the driving voltages applied by each sub-electrode in the electrochromic structure corresponding to the green light emitting device B are also the same.

[0082] Optionally, the display panel further includes a driving circuit layer 19 arranged between the substrate 10 and the pixel definition layer 11, which is also called a thin film transistor (TFT) layer. The driving circuit layer 19 can include an active layer (Active) formed on the substrate 10 by a patterning process, a gate insulating layer (GI) formed on the active layer by deposition or the like, a gate (Gate) of a thin film transistor formed on the gate insulating layer by a patterning process, an interlayer dielectric layer (ILD) formed on the gate by deposition or the like, a source-drain metal layer formed on the interlayer dielectric layer, and a planarization layer (PLN) covering the source-drain metal layer and the exposed interlayer dielectric layer. The source-drain metal layer forms a source (Source) and a drain (Drain) of the thin film transistor, for example, the source is electrically connected to the active layer through an interlayer dielectric via. The active layer can be made of polycrystalline silicon and metal oxide, etc., the gate insulating layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, the interlayer dielectric layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, the gate material includes metals or alloy materials such as aluminum, titanium, and cobalt, and the planarization layer is, for example, an organic material. In specific implementation, the driving circuit layer 19 can be a double Gate layer structure, a double-layer SD (i.e., two layers of source-drain metal layers) structure, a three-layer SD (i.e., three layers of source-drain metal layers) structure, etc., and the specific film layer structure of the driving circuit layer 19 is not limited in the present disclosure.

[0083] Optionally, the first transistors and the first capacitors in the first driving circuit 18, such as the transistors MUX1, MUX2, MUX3, MUX4, MUX5, MUX6, MUX7, MUX8, MUX9, the capacitors C1, C2, C3, C4, C5, C6, C7, C8, and C9, can be arranged in the same layer as part of the film layers in the driving circuit layer 19, that is, the first transistors and the first capacitors are formed in the first bezel area 11 at the same time when the driving circuit layer 19 is prepared.

[0084] Optionally, the electrochromic structure 15 further comprises a first insulating layer 154, which is arranged between the first electrode 151 and the second electrode 153.

[0085] Optionally, the first insulating layer 154 is arranged between the first electrode 151 and the electrochromic layer 152.

[0086] Optionally, the first insulating layer 154 is arranged between the electrochromic layer 152 and the second electrode 153.

[0087] In the embodiments of the present disclosure, by arranging the first insulating layer 154 between the first electrode 151 and the second electrode 153, the insulation performance between the first electrode 151 and the second electrode 153 can be ensured.

[0088] Based on the same inventive concept, the second aspect of the present disclosure provides a preparation method of a display panel, as shown in Figure 8 The preparation method comprises the following steps:

[0089] In step S101, a first substrate is provided.

[0090] In step S102, a pixel defining layer, a light emitting device layer, an encapsulation layer, and a black matrix layer are sequentially stacked on one side of the substrate, the pixel defining layer comprises a plurality of sub-pixel openings, the light emitting device layer comprises a light emitting device corresponding to each sub-pixel opening, the black matrix layer comprises a plurality of black matrix openings, the black matrix openings are arranged one by one corresponding to the sub-pixel openings, and an electrochromic structure is arranged in an edge region of the black matrix opening, the electrochromic structure comprises a first electrode, an electrochromic layer, and a second electrode which are sequentially stacked away from the substrate.

[0091] Based on the same inventive concept, the third aspect of the present disclosure provides a driving method of a display panel, which is suitable for the display panel as shown above, as shown in Figure 9 The driving method comprises the following steps:

[0092] In step S201, the brightness information of the ambient light is obtained.

[0093] Exemplarily, the ambient light information, i.e., brightness, chrominance and the like of the ambient light, can be detected by the ambient light sensor. Figure 7 As shown in FIG. 18, the driving control unit 181 of the first driving circuit is connected with the ambient light sensor, and the brightness and chrominance information of the ambient light detected by the ambient light sensor can be acquired.

[0094] Optionally, the driving control unit 181 can also be connected with the vehicle control system, and the ambient light information can be acquired from the vehicle control system. The embodiments of the present disclosure do not limit the acquisition manner of the ambient light information.

[0095] In step S202, the driving voltage required by the electrochromic structure in the display panel is calculated according to the brightness and chrominance information of the ambient light.

[0096] In the embodiments of the present disclosure, after the brightness and chrominance information of the ambient light is acquired, the driving control unit 181 can adjust the voltage output to the electrochromic structure according to the brightness and chrominance information of the ambient light, so as to change the color and transmittance of the electrochromic structure. When the color and transmittance of the electrochromic structure change, the brightness and chrominance of the light emitting device in the region will be affected, and finally the effect that the brightness and chrominance of the display panel in the region tends to be consistent with the brightness and chrominance of the ambient light is realized.

[0097] Exemplarily, at dusk, the ambient light is yellowish, the ambient light sensor converts the light signal into an electric signal and transmits it to the driving control unit, and the driving control unit calculates the driving voltage required by the electrochromic structure according to the received electric signal. The driving voltage satisfies that when the display panel normally displays, the light emitted by the region where the electrochromic structure is located is yellowish, i.e., the brightness and chrominance of the light emitted by the region tends to be consistent with the brightness and chrominance of the ambient light. In this way, the reflected light 2 of the front windshield can be fused with the ambient light 3, and the effect that the reflected light 2 of the front windshield is invisible is realized, and then the interference of the reflected light 2 on the driver is reduced.

[0098] In specific implementation, for example, the ambient light is yellowish, and the transmittance of the electrochromic structure 15 corresponding to the red light emitting device R, the green light emitting device G and the green light emitting device B can be adjusted. For example, the driving voltage output can be controlled, so that the electrochromic structure 15 at the positions of the red light emitting device R and the green light emitting device G is in a transparent state, and the electrochromic structure 15 at the position of the blue light emitting device B is in a non-transparent state, i.e., the blue light is reduced. At this time, the light emitted by the display panel as a whole presents a yellowish effect.

[0099] In step S203, the driving voltage is applied to each electrochromic structure to adjust the brightness and chrominance of the target visual angle range of the display panel, so that the brightness and chrominance of the target visual angle range tends to be consistent with the brightness and chrominance of the ambient light. The target visual angle range is the light emitting visual angle range corresponding to the electrochromic structure.

[0100] Exemplarily, as shown in FIG. 19, the electrochromic structure 15 corresponding to the red light emitting device R, the green light emitting device G and the blue light emitting device B is in a transparent state, and the light emitted by the display panel as a whole presents a white effect.Figure 10 As shown, for any light emitting device, the light emitting region of the light emitting device can be represented by the visual angle a1+a2+a3, wherein a1 represents Figure 10 the light emitting visual angle range corresponding to the left side electroluminescent structure 15 in FIG. 1, a3 represents Figure 10 the light emitting visual angle range corresponding to the right side electroluminescent structure 15 in FIG. 1, and the target visual angle range is the visual angle range represented by a1 and a3. Compared with the visual angle a2, a1 and a3 can also be understood as the large visual angle range of the display panel, and when the electroluminescent structure 15 is arranged, the lightness chromaticity of the display panel in the visual angle range a1 and a3 can be adjusted, that is, the lightness chromaticity of the large visual angle range of the display panel can be adjusted.

[0101] Based on the same inventive concept, the fourth aspect of the present disclosure provides a display device comprising the display panel as described above. Exemplarily, the display device can be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc., and the present embodiment is not limited thereto.

[0102] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation manners of the present disclosure. For those skilled in the art, on the basis of the above description, other different forms of changes or modifications can also be made, and it is impossible to enumerate all the implementation manners here. Any changes or modifications falling within the scope of the technical solutions of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A display panel, characterized by, The display panel comprises a substrate, a pixel defining layer, a light emitting device layer, an encapsulation layer and a black matrix layer which are sequentially stacked on one side of the substrate, the pixel defining layer comprises a plurality of sub-pixel openings, the light emitting device layer comprises a light emitting device corresponding to each of the sub-pixel openings, and the black matrix layer comprises a plurality of black matrix openings corresponding to the sub-pixel openings, wherein an electrochromic structure is arranged in an edge region of the black matrix opening, and the electrochromic structure comprises a first electrode, an electrochromic layer and a second electrode which are sequentially stacked away from the substrate. A normal projection of the black matrix opening on the substrate covers a normal projection of the sub-pixel opening on the substrate, and a normal projection of the electrochromic structure on the substrate does not overlap with the normal projection of the sub-pixel opening on the substrate. The black matrix opening comprises a first region, a second region and a third region which are sequentially distributed along a first direction, the normal projection of the second region on the substrate overlaps with the normal projection of the sub-pixel opening on the substrate, and the electrochromic structure is arranged in at least one region of the first region and the third region in which light rays are directed towards the front windshield.

2. The display panel of claim 1, wherein, One of the first electrode and the second electrode comprises a plurality of sub-electrodes, and a normal projection of the electrochromic layer on the substrate covers normal projections of the plurality of sub-electrodes on the substrate.

3. The display panel of claim 2, wherein, For each electrochromic structure, the other one of the first electrode and the second electrode is connected in series to form a mesh structure.

4. The display panel of claim 2, wherein, The display panel has a display area and first and second frame areas arranged on opposite sides of the display area, one of the first and second frame areas is a binding area, and each sub-electrode of the plurality of sub-electrodes extends from the display area into the other one of the first and second frame areas to form a plurality of voltage input terminals.

5. The display panel of claim 4, wherein, The light emitting device layer comprises light emitting devices of different colors, wherein each sub-electrode in the electrochromic structure corresponding to each light emitting device of the same color is connected in series one by one.

6. The display panel of claim 5, wherein, The display panel further comprises a first driving circuit arranged in the other one of the first and second frame areas, the first driving circuit comprises a driving control unit and a plurality of sub-driving units, the driving control unit comprises a first output terminal and a second output terminal, and for any sub-driving unit, the sub-driving unit comprises a first transistor and a first capacitor, a gate of the first transistor is connected to the second output terminal, a source of the first transistor is connected to the first output terminal, a drain of the first transistor is connected to a first end of the first capacitor and one voltage input terminal, and a second end of the first capacitor is connected to a first voltage signal.

7. The display panel of claim 1, wherein, The electrochromic structure further comprises a first insulating layer arranged between the first electrode and the second electrode.

8. The display panel of claim 1, wherein, The display panel further comprises: a color filter layer comprising a plurality of color filters, the color filters covering at least the black matrix openings; and / or A touch layer is disposed between the encapsulation layer and the black matrix layer.

9. A driving method of a display panel, suitable for the display panel according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Obtaining brightness information of ambient light; Calculating a driving voltage required by an electrochromic structure in a display panel according to the brightness information of the ambient light; Applying the driving voltage to each electrochromic structure to adjust the brightness of a target viewing angle range of the display panel so that the brightness of the target viewing angle range tends to be consistent with the brightness of the ambient light, the target viewing angle range being a light-emitting viewing angle range corresponding to the electrochromic structure.

10. A display device, characterized by comprising: The display panel comprises any one of claims 1-8.

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