Display panel and display device

Abstract

The application discloses a display panel and a display device, relates to the technical field of display, and can reduce the color difference between the display area and the non-display area of the display product in the non-display state, thereby improving the integrated black appearance effect of the display product. A display panel comprises a display substrate comprising a display area and a non-display area; a cover plate arranged on the display side of the display substrate, the cover plate comprising a first area and a second area, the second area surrounding the first area, the orthographic projection of the first area on the display substrate covering the display area, and the orthographic projection of the second area on the display substrate covering the non-display area; an optical adhesive arranged between the display substrate and the cover plate; the first area of the cover plate is provided with a first light shielding layer, the second area of the cover plate is provided with a second light shielding layer, the light transmittance of the first light shielding layer is greater than that of the second light shielding layer; and / or the light transmittance of the optical adhesive is less than 90%.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] With the continuous development of display technology, the consumer market has increasingly diverse and growing demands for display products. Currently, there is a growing demand from some consumers for a seamless black appearance in dark conditions. However, in typical display products, due to the reflectivity or high transmittance of the internal film structure of the display area, there is a significant difference in dark colors between the display area and the non-display border area. The border area of ​​the non-display area is darker, making it difficult to achieve a seamless black appearance when no image is displayed. Summary of the Invention

[0003] This application provides a display panel and display device that can reduce the color difference between the display area and the non-display area of ​​the display product in the non-display state, thereby improving the all-black appearance effect of the display product.

[0004] A first aspect of this application provides a display panel, including:

[0005] Display substrate, including display area and non-display area;

[0006] A cover plate is disposed on the display side of the display substrate. The cover plate includes a first region and a second region. The second region surrounds the first region. The orthographic projection of the first region on the display substrate covers the display area, and the orthographic projection of the second region on the display substrate covers the non-display area.

[0007] Optical adhesive is disposed between the display substrate and the cover plate;

[0008] The first region of the cover plate is provided with a first light-shielding layer, and the second region of the cover plate is provided with a second light-shielding layer, wherein the light transmittance of the first light-shielding layer is greater than the light transmittance of the second light-shielding layer; and / or,

[0009] The light transmittance of the optical adhesive is less than 90%.

[0010] In some embodiments, the thickness of the first light-shielding layer is less than the thickness of the second light-shielding layer; and / or,

[0011] The first light-shielding layer and / or the second light-shielding layer comprise ink; and / or,

[0012] The light transmittance of the optical adhesive is less than or equal to 85%.

[0013] In some embodiments, the first light-shielding layer comprises a single ink coating, and the second light-shielding layer comprises at least two ink coatings; and / or,

[0014] The thickness of the first light-shielding layer ranges from 2 μm to 3 μm; and / or,

[0015] The thickness of the second light-shielding layer ranges from 10 μm to 18 μm; and / or,

[0016] The light transmittance of the first light-shielding layer is less than 90%; and / or,

[0017] The light transmittance of the second light-shielding layer is less than 70%; and / or,

[0018] The light transmittance of the optical adhesive is less than or equal to 80%.

[0019] In some embodiments, both the first light-shielding layer and the second light-shielding layer are disposed on the surface of the cover plate near the display substrate; and / or,

[0020] The light transmittance of the first light-shielding layer is less than or equal to 85%; and / or,

[0021] The light transmittance of the optical adhesive is less than or equal to 75%.

[0022] In some embodiments, the optical adhesive is doped with a light-shielding material; and / or,

[0023] The light transmittance of the first light-shielding layer is less than or equal to 70%; and / or,

[0024] The light transmittance of the optical adhesive is greater than or equal to 60%.

[0025] In some embodiments, the display panel further includes:

[0026] A polarizer is disposed between the display substrate and the optical adhesive;

[0027] The light transmittance of the polarizer is less than or equal to 43%.

[0028] In some embodiments, the polarizer includes a first protective layer, a first support layer, a polarizing characteristic layer, a second support layer, a polarizing functional layer, a second protective layer, and a third light-shielding layer stacked together. The first support layer is disposed between the first protective layer and the polarizing characteristic layer, the polarizing characteristic layer is disposed between the first support layer and the second support layer, the polarizing functional layer is disposed between the second support layer and the second protective layer, the first protective layer is located between the first support layer and the cover plate, and the second protective layer is located between the polarizing functional layer and the display substrate.

[0029] The third light-shielding layer is disposed between the first protective layer and the first support layer, and / or, the third light-shielding layer is disposed between the second support layer and the polarizing functional layer, and / or, the third light-shielding layer is disposed between the polarizing functional layer and the second protective layer.

[0030] In some embodiments, the third light-shielding layer comprises ink; and / or,

[0031] The light transmittance of the polarizer is less than or equal to 40%.

[0032] In some embodiments, the third light-shielding layer is coated on the surface of the first protective layer away from the cover plate; and / or,

[0033] The third light-shielding layer is coated on the surface of the first support layer near the first protective layer; and / or,

[0034] The third light-shielding layer is coated on the surface of the second support layer away from the first support layer; and / or,

[0035] The third light-shielding layer is coated on the side of the second protective layer away from the display substrate.

[0036] In some embodiments, the thickness of the third light-shielding layer ranges from 2 μm to 3 μm; and / or,

[0037] The light transmittance of the polarizer is greater than or equal to 30%.

[0038] In some embodiments, the display substrate includes at least one metal layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal layer near the cover plate; and / or,

[0039] The display substrate includes at least one metal alloy layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal alloy layer near the cover plate; and / or,

[0040] The display substrate includes at least one metal oxide layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal oxide layer near the cover plate; and / or,

[0041] The display substrate includes a pixel defining layer, the pixel defining layer includes a cutout, a light-emitting layer is disposed within the cutout, and a light-absorbing material is doped within the pixel defining layer.

[0042] A second aspect of this application provides a display device, comprising:

[0043] The display panel as described in the first aspect.

[0044] The display panel provided in this application embodiment has a first light-shielding layer in a first region of the cover plate and a second light-shielding layer in a second region of the cover plate. The first light-shielding layer covers the display area of ​​the display substrate, and the second light-shielding layer covers the non-display area of ​​the display substrate. Alternatively, using an optical adhesive with a light transmittance of less than 90% can reduce the light transmittance of the display area of ​​the display panel, thereby reducing the light transmittance of the display area and non-display area of ​​the display panel in the non-display state. This reduces the reflectivity of the display area of ​​the display panel to ambient light in the non-display state, narrowing the color difference between the display area and non-display area of ​​the display panel in the non-display state. Specifically, it can narrow the black gradient difference between the display area and non-display area of ​​the display panel in the non-display state, improving the integrated appearance of the display panel in the non-display state and enhancing the all-black appearance to meet the needs of customers with high requirements for an all-black appearance. Attached Figure Description

[0045] Figure 1 A top view of the display side of a display panel provided in an embodiment of this application;

[0046] Figure 2 A schematic cross-sectional view of a display panel along A1-A2 is provided for an embodiment of this application;

[0047] Figure 3 A schematic cross-sectional view of another display panel along A1-A2 provided in this application embodiment;

[0048] Figure 4 A schematic structural diagram of a polarizer provided in an embodiment of this application;

[0049] Figure 5 A schematic structural diagram of another polarizer provided in an embodiment of this application;

[0050] Figure 6 A schematic structural diagram of another polarizer provided in an embodiment of this application;

[0051] Figure 7 A schematic partial structural diagram of a display substrate provided in an embodiment of this application;

[0052] Figure 8 This is a schematic structural diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0053] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0054] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0055] With the continuous development of display technology, the consumer market has increasingly diverse and growing demands for display products. Currently, there is a growing demand from some consumers for a seamless black appearance in dark conditions. However, in typical display products, due to the reflectivity or high transmittance of the internal film structure of the display area, there is a significant difference in dark colors between the display area and the non-display border area. The border area of ​​the non-display area is darker, making it difficult to achieve a seamless black appearance when no image is displayed.

[0056] In view of this, embodiments of this application provide a display panel and a display device that can reduce the color difference between the display area and the non-display area of ​​the display product in a dark state, thereby improving the overall black appearance of the display product.

[0057] A first aspect of this application provides a display panel. Figure 1 A top view of the display side of a display panel provided in an embodiment of this application; Figure 2 This is a schematic cross-sectional view of a display panel along line A1-A2, provided as an embodiment of this application. (In conjunction with...) Figure 1 and Figure 2The display panel includes a display substrate 100, a cover plate 200, and an optical adhesive 300. The display substrate 100 includes a display area 110 and a non-display area 120. Pixel structures can be disposed within the display area 110, which emits light to display an image. The non-display area 120 surrounds the display area 110 and is typically located at the edge of the display panel. Driving circuits and signal lines can be arranged within the non-display area 120 to drive the light emitted by the pixel structures within the display area 110. The cover plate 200 is disposed on the display side D of the display substrate 100, with the side of the display substrate 100 emitting light serving as the display side D. The cover plate 200 protects the display substrate 100. The cover plate 200 includes a first region 210 and a second region 220. The second region 220 surrounds the first region 210. The orthographic projection of the first region 210 onto the display substrate 100 covers the display area 110, and the orthographic projection of the second region 220 onto the display substrate 100 covers the non-display area 120. It should be noted that the coverage here can be full or partial. Optical adhesive 300 is disposed between the display substrate 100 and the cover plate 200, and can be used to bond and fix the display substrate 100 and the cover plate 200. A first light-shielding layer 211 is disposed in the first region 210 of the cover plate 200, and a second light-shielding layer 221 is disposed in the second region 220 of the cover plate 200. The light transmittance of the first light-shielding layer 211 is greater than that of the second light-shielding layer 221. Both the first and second light-shielding layers 211 can be used to block light. It should be noted that light blocking is usually achieved by absorbing light, which can reduce the light transmittance of the corresponding area. In addition, under the light absorption effect, the reflected light is usually black, so the display side of the display panel in the non-display state appears black to the human eye. The greater light transmittance of the first light-shielding layer 211 than the second light-shielding layer 221 ensures that the light emitted from the display area 110 is used for normal image display, thus ensuring normal image display requirements. The first light-shielding layer 211 can also reduce the film layer difference on the surface of the cover plate near the display substrate 100 caused by the setting of the second light-shielding layer 221.

[0058] For example, the color ratio of the first light-shielding layer 211 and the second light-shielding layer 221 can be different, and the color of the first light-shielding layer 211 can be lighter than the color of the second light-shielding layer 221, so as to achieve that the light transmittance of the first light-shielding layer 211 is greater than the light transmittance of the second light-shielding layer 221.

[0059] In some examples, the light transmittance of optical adhesive 300 is less than 90%. Typically, the light transmittance of optical adhesive 300 is greater than 90%. A higher light transmittance ensures the normal light output of the display panel, resulting in better display brightness. By using optical adhesive 300 with reduced light transmittance, the transmittance of reflected light from the external environment by the internal film layers of the display panel can be reduced. In non-display states, this reduces reflected light emission from the display panel, deepening the black effect in dark conditions.

[0060] It should be noted that a first light-shielding layer 211 can be provided on the cover plate 200 corresponding to the display area 110 of the display panel, using an optical adhesive 300 with a light transmittance greater than or equal to 90%; alternatively, an optical adhesive with a light transmittance less than 90% can be used, and the first area 210 of the cover plate 200 is not provided with a light-shielding layer; or a first light-shielding layer 211 can be provided on the cover plate 200 corresponding to the display area 110 of the display panel, using an optical adhesive 300 with a light transmittance less than 90%.

[0061] It should be noted that with the continuous development of display technology, its application in smart wearables and other smart devices is becoming increasingly widespread. Currently, most smart wearable products are concentrated on functions such as sports and health monitoring, and consumers are placing increasingly higher demands on the appearance of smart wearable products, especially the seamless black effect when not displaying. Due to batch variations in the production of display substrates, the reflection effect of the internal film layers on ambient light varies. Even with the same cover glass, it is difficult to achieve a seamless black effect for all products, and some still exhibit a bluish tint, failing to meet customer needs. In addition, existing display products, in pursuit of high display brightness and high display effect, have high light transmittance in their internal film layers and external optical films, making it difficult to achieve a seamless black effect when not displaying.

[0062] To address the aforementioned issues, the display panel provided in this application embodiment has a first light-shielding layer 211 in the first region 210 of the cover plate 200 and a second light-shielding layer 221 in the second region 220 of the cover plate 200. The first light-shielding layer 211 covers the display area 110 of the display substrate 100, and the second light-shielding layer 221 covers the non-display area 120 of the display substrate 100. Alternatively, an optical adhesive 300 with a light transmittance of less than 90% can be used to reduce the light transmittance of the display area of ​​the display panel. This reduces the light transmittance of the display area and non-display area of ​​the display panel in the non-display state, thereby reducing the reflectivity of the display area of ​​the display panel to ambient light in the non-display state. This also reduces the color difference between the display area and non-display area of ​​the display panel in the non-display state. Specifically, it reduces the black gradient difference between the display area and non-display area of ​​the display panel in the non-display state, improving the overall appearance of the display panel in the non-display state and enhancing the all-black appearance to meet the needs of customers with high requirements for an all-black appearance.

[0063] In some embodiments, the first light-shielding layer 211 and the second light-shielding layer 221 are both disposed on the side surface of the cover plate 200 close to the display substrate 100. The manufacturing process is simple and can avoid scratches caused by the first light-shielding layer 211 and the second light-shielding layer 221 being disposed on the cover plate 200 away from the display side D.

[0064] In some embodiments, the thickness of the first light-shielding layer 211 is less than the thickness of the second light-shielding layer 221. This difference in film thickness allows the light transmittance of the first light-shielding layer 211 to be greater than that of the second light-shielding layer 221. For example, at least one of the first light-shielding layer 211 and the second light-shielding layer 221 includes ink. The light absorption properties of the ink material can be used to reduce light transmittance. The first and second light-shielding layers 211 and 221 can be formed by coating ink onto the surface of one side of the cover plate, or by spraying or printing. This application does not specifically limit the methods described. Ink is commonly used as a material for the frame light-shielding layer of the cover plate 200. The materials and processes are relatively mature. Using ink in the first light-shielding layer 211 of the display area of ​​the display panel does not require additional processing steps for the preparation of the cover plate 200, will not affect production capacity, and has a low risk of low yield.

[0065] In some embodiments, the first light-shielding layer 211 comprises a single-layer ink coating. Exemplarily, the single-layer ink coating may be obtained through a single ink coating, spraying, or printing process. The thickness of the single-layer ink coating may range from 2 μm to 3 μm, and the thickness of the first light-shielding layer 211 may also range from 2 to 3 μm. Exemplarily, the light transmittance of the first light-shielding layer may be less than 90%.

[0066] In some embodiments, the second light-shielding layer 221 may include at least two ink coatings, such as two to three ink coatings. For example, the thickness of the second light-shielding layer 221 may range from 10 μm to 18 μm, and the light transmittance of the second light-shielding layer 221 is less than 70%. The low light transmittance of the second light-shielding layer 221 can prevent edge light leakage when the display panel is in display mode.

[0067] For example, the light transmittance of the first light-shielding layer 211 is less than or equal to 85%. For instance, the light transmittance of the first light-shielding layer 211 can be in the range of 80% to 85% or 70% to 80%.

[0068] For example, the light transmittance range of the optical adhesive 300 can be less than or equal to 85%, for example, it can be 80% to 85%, 75% to 80%, 70% to 75% or 60% to 75%, all including the two endpoint values ​​of the range.

[0069] In some embodiments, the optical adhesive 300 is doped with a light-shielding material. The doping of the light-shielding material can reduce the light transmittance of the optical adhesive 300. For example, the light-shielding material can be a black light-absorbing material such as graphite particles or carbon powder.

[0070] In some embodiments, the optical adhesive 300 may include a light-absorbing substrate layer, with adhesive layers adhered to both sides of the light-absorbing substrate layer to obtain a double-sided adhesive with light-absorbing properties, used to bond the light-emitting substrate 100 and the cover plate 200, which can ensure that the optical adhesive 300 has low light transmittance. For example, the light-absorbing substrate layer may be a graphite substrate layer or carbon paper, etc., without specific limitation.

[0071] In some implementations... Figure 3 This is a schematic cross-sectional view along A1-A2 of another display panel provided in an embodiment of this application. The display panel further includes a polarizer 400, which is disposed between the display substrate 100 and the optical adhesive 300; the polarizer 400 is used for polarization filtering. The light transmittance of the polarizer 400 can be less than or equal to 43%, for example, the light transmittance range of the polarizer 400 can be 40% to 43%, 30% to 40%, etc. Typically, the light transmittance of the polarizer 400 is around 45%. By using a polarizer 400 with low light transmittance, the light transmittance above the display substrate 100 can be reduced, which can improve the seamless black effect when not in display mode.

[0072] In some implementations... Figure 4 This is a schematic structural diagram of a polarizer provided in an embodiment of this application. Figure 4As shown, the polarizer 400 includes a first protective layer 410, a first support layer TAC1, a polarizing characteristic layer 430, a second support layer TAC2, a polarizing functional layer 440, a second protective layer 420, and a third light-shielding layer 450 stacked together. The first support layer TAC1 is disposed between the first protective layer 410 and the polarizing characteristic layer 430. The polarizing characteristic layer 430 is disposed between the first support layer TAC1 and the second support layer TAC2. The polarizing functional layer 440 is disposed between the second support layer TAC2 and the second protective layer 420. The first protective layer 410 is located between the first support layer TAC1 and the cover plate 200, and the second protective layer 420 is located between the polarizing functional layer 440 and the display substrate 100. A second adhesive layer AD2 is disposed between the polarizing functional layer 440 and the second protective layer 420, and a first adhesive layer AD1 is disposed between the polarizing functional layer 440 and the second support layer TAC2. The first adhesive layer AD1 and the second adhesive layer AD2 serve as adhesive layers. The polarizing characteristic layer 430 determines optical properties such as light transmittance, polarization degree, and hue; the polarizing functional layer 440 can convert linearly polarized light into circularly polarized light. The first support layer TAC1 and the second support layer TAC2 are used to protect and support the polarizing characteristic layer 430. The first protective layer 410 and the second protective layer 420 can be used to provide electrostatic protection and stress protection.

[0073] In some implementations, reference Figure 4 The third light-shielding layer 450 is disposed between the first protective layer 410 and the first support layer TAC1. For example, the third light-shielding layer 450 may include ink, such as an ink coating. The third light-shielding layer 450 may be coated on the surface of the first protective layer 410 near the first support layer TAC1, that is, the third light-shielding layer 450 is sprayed or printed on the surface of the first protective layer 410 away from the cover plate 200; or, the third light-shielding layer 450 may be coated on the surface of the first support layer TAC1 near the first protective layer 410, that is, the third light-shielding layer 450 is sprayed or printed on the surface of the first support layer TAC1 near the first protective layer 410.

[0074] In some implementations... Figure 5 This is a schematic structural diagram of another polarizer provided in an embodiment of this application. (See diagram below.) Figure 5 As shown, the third light-shielding layer 450 is disposed between the second support layer TAC2 and the polarizing functional layer 440. The third light-shielding layer 450 is disposed between the second support layer TAC2 and the first adhesive layer AD1. For example, the third light-shielding layer 450 is coated on the surface of the second support layer TAC2 away from the first support layer TAC1.

[0075] In some implementations... Figure 6 This is a schematic structural diagram of another polarizer provided in an embodiment of this application. For example... Figure 6As shown, the third light-shielding layer 450 is disposed between the polarizing functional layer 440 and the second protective layer 420. For example, the third light-shielding layer 450 is disposed between the second adhesive layer AD2 and the second protective layer 420. The third light-shielding layer 450 can be coated on the surface of the second protective layer 420 away from the display substrate 100, that is, the third light-shielding layer 450 can be coated on the surface of the second protective layer 420 near the second adhesive layer AD2.

[0076] In some embodiments, the thickness of the third light-shielding layer 450 can range from 2 μm to 3 μm, and it can be a single-layer ink coating.

[0077] In some embodiments, a third light-shielding layer 450 can be provided at three locations: between the polarizing functional layer 440 and the second protective layer 420, between the second support layer TAC2 and the polarizing functional layer 440, and between the first protective layer 410 and the first support layer TAC1. This can enhance the effect of reducing the light transmittance of the polarizer 400.

[0078] In some embodiments, a third light-shielding layer 450 may be provided at one or two of the following three locations: between the polarizing functional layer 440 and the second protective layer 420, between the second support layer TAC2 and the polarizing functional layer 440, and between the first protective layer 410 and the first support layer TAC1. The number and thickness of the third light-shielding layer 450 may be provided according to the light transmittance requirements, and this application embodiment does not make specific limitations.

[0079] In some embodiments, the display substrate 100 includes at least one metal layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal layer near the cover plate 200. The light-absorbing and conductive layer can be a graphite material or conductive ink, etc., and the embodiments of this application do not specifically limit it. Typically, the metal layer has reflective properties, such as titanium, aluminum or molybdenum, for example, the gate, source and drain electrodes of the thin film transistor, the anode of the light-emitting device, etc. in the display substrate.

[0080] In some embodiments, the display substrate 100 includes at least one metal alloy layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal alloy layer near the cover plate 200; the metal alloy layer may include aluminum-magnesium alloy and aluminum-lithium alloy, etc.

[0081] In some embodiments, the display substrate 100 includes at least one metal oxide layer, and a light-absorbing and conductive layer is disposed on the surface of the at least one metal oxide layer near the cover plate 200; the metal oxide layer may include indium tin oxide or an oxide semiconductor material, etc. Indium tin oxide can be used to provide a cathode, and the oxide semiconductor material can serve as an active layer. The active layer may also be made of other semiconductor materials, such as polysilicon, and a light-absorbing and conductive layer may also be disposed on the surface of the active layer near the cover plate 200.

[0082] In some embodiments, the display substrate 100 includes a pixel defining layer, the pixel defining layer includes a cutout, a light-emitting layer is disposed within the cutout, and a light-absorbing material is doped within the pixel defining layer.

[0083] In some implementations... Figure 7 This is a schematic partial structural diagram of a display substrate provided in an embodiment of this application. Figure 7 As shown, the display substrate 100 includes a substrate layer 101, a backplane BP, a pixel defining layer PDL, a cathode 105, and an encapsulation layer 106. The encapsulation layer 106 is disposed near the polarizer 400. The pixel defining layer PDL has a cutout 102, within which an anode 103 and a light-emitting layer 104 are disposed. A driving transistor TFT is disposed within the backplane BP. The driving transistor TFT includes a gate, an active layer, a source, and a drain. The driving transistor TFT is electrically connected to the anode 103. Under the action of a driving signal, the anode 103 and the cathode 105 drive the light-emitting layer 104 to emit light for image display.

[0084] For example, refer to Figure 7 A light-absorbing conductive layer can be deposited on the surface of the anode 103 and cathode 105 near the polarizer 400. This will not affect the conductivity of the anode 103 and cathode 105, but will also reduce their resistance, reduce the voltage drop effect, improve luminous performance, reduce the reflectivity of ambient light, and improve the overall black appearance in the dark state. Alternatively, a light-absorbing conductive layer can be deposited on the electrode surface of the driving transistor TFT to reduce the reflectivity of ambient light.

[0085] A second aspect of this application provides a display device. Figure 8 This is a schematic structural diagram of a display device provided in an embodiment of this application. Figure 8 As shown, the display device includes a display panel 1000 as described in the first aspect.

[0086] It should be noted that the display device provided in this application embodiment may include smartphones, tablets, laptops, televisions, smart wearable devices, etc., and smart wearable devices may include smartwatches,

[0087] The display panel provided in this application embodiment has a first light-shielding layer 211 in a first region 210 of the cover plate 200 and a second light-shielding layer 221 in a second region 220 of the cover plate 200. The first light-shielding layer 211 covers the display area 110 of the display substrate 100, and the second light-shielding layer 221 covers the non-display area 120 of the display substrate 100. Alternatively, using an optical adhesive 300 with a light transmittance of less than 90% can reduce the light transmittance of the display area of ​​the display panel, thereby reducing the light transmittance of the display area and non-display area of ​​the display panel in the non-display state. This reduces the reflectivity of the display area of ​​the display panel to ambient light in the non-display state, narrowing the color difference between the display area and non-display area of ​​the display panel in the non-display state. Specifically, it can narrow the black gradient difference between the display area and non-display area of ​​the display panel in the non-display state, improving the integrated appearance of the display panel in the non-display state and enhancing the all-black appearance to meet the needs of customers with high requirements for an all-black appearance.

[0088] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0089] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0090] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0091] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A display panel, characterized by, The display panel comprises: a display substrate comprising a display area and a non-display area; a cover plate arranged on the display side of the display substrate, the cover plate comprising a first area and a second area, the second area surrounding the first area, a normal projection of the first area on the display substrate covering the display area, and a normal projection of the second area on the display substrate covering the non-display area; optical glue arranged between the display substrate and the cover plate; the first area of the cover plate is provided with a first light shielding layer, the second area of the cover plate is provided with a second light shielding layer, the light transmittance of the first light shielding layer is greater than that of the second light shielding layer, and the light transmittance of the first light shielding layer ranges from 70% to 90%; and / or, the light transmittance of the optical glue ranges from 60% to 90%; the display substrate comprises at least one metal layer, at least one surface of at least one metal layer close to the side of the cover plate is provided with a light-absorbing conductive layer; and / or, the display substrate comprises at least one metal alloy layer, at least one surface of at least one metal alloy layer close to the side of the cover plate is provided with a light-absorbing conductive layer; and / or, the display substrate comprises at least one metal oxide layer, at least one surface of at least one metal oxide layer close to the side of the cover plate is provided with a light-absorbing conductive layer.

2. The display panel of claim 1, wherein: the thickness of the first light shielding layer is less than that of the second light shielding layer; and / or, the first light shielding layer and / or the second light shielding layer comprises ink; and / or, the light transmittance of the optical glue is less than or equal to 85%.

3. The display panel of claim 2, wherein: the first light shielding layer comprises a single-layer ink coating, and the second light shielding layer comprises at least two layers of ink coating; and / or, the thickness of the first light shielding layer ranges from 2 μm to 3 μm; and / or, the thickness of the second light shielding layer ranges from 10 μm to 18 μm; and / or, the light transmittance of the first light shielding layer is less than 90%; and / or, the light transmittance of the second light shielding layer is less than 70%; and / or, the light transmittance of the optical glue is less than or equal to 80%.

4. The display panel of claim 3, wherein: the first light shielding layer and the second light shielding layer are both arranged on the surface of the side of the cover plate close to the display substrate; and / or, the light transmittance of the first light shielding layer is less than or equal to 85%; and / or, the light transmittance of the optical glue is less than or equal to 75%.

5. The display panel of claim 4, wherein: the optical glue is doped with a light shielding material; and / or, the light transmittance of the first light shielding layer is less than or equal to 70%; and / or, the light transmittance of the optical glue is greater than or equal to 60%.

6. The display panel of any one of claims 1-4, wherein, Further comprising: a polarizer arranged between the display substrate and the optical glue; the light transmittance of the polarizer is less than or equal to 43%.

7. The display panel of claim 6, wherein: The polarizing sheet comprises a first protective layer, a first support layer, a polarizing characteristic layer, a second support layer, a polarizing functional layer, a second protective layer and a third light shielding layer which are stacked, the first support layer is arranged between the first protective layer and the polarizing characteristic layer, the polarizing characteristic layer is arranged between the first support layer and the second support layer, the polarizing functional layer is arranged between the second support layer and the second protective layer, the first protective layer is located between the first support layer and the cover plate, and the second protective layer is located between the polarizing functional layer and the display substrate. The third light shielding layer is arranged between the first protective layer and the first support layer, and / or the third light shielding layer is arranged between the second support layer and the polarizing functional layer, and / or the third light shielding layer is arranged between the polarizing functional layer and the second protective layer.

8. The display panel of claim 7, wherein The third light shielding layer comprises ink; and / or The light transmittance of the polarizing sheet is less than or equal to 40%.

9. The display panel of claim 8, wherein The third light shielding layer is coated on a side surface of the first protective layer away from the cover plate; and / or The third light shielding layer is coated on a side surface of the first support layer close to the first protective layer; and / or The third light shielding layer is coated on a side surface of the second support layer away from the first support layer; and / or The third light shielding layer is coated on a side surface of the second protective layer away from the display substrate.

10. The display panel of claim 8, wherein The thickness of the third light shielding layer ranges from 2 μm to 3 μm; and / or The light transmittance of the polarizing sheet is greater than or equal to 30%.

11. The display panel of claim 1, wherein The display substrate comprises a pixel defining layer, the pixel defining layer comprises a hollow, the hollow is provided with a light emitting layer, and the pixel defining layer is doped with a light absorbing material.

12. A display device comprising: including: The display panel of any one of claims 1-11.

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