Display device

Abstract

The embodiment of the invention discloses a display device. In one embodiment, a display device includes a substrate; the driving circuit layer is positioned on one side of the substrate and comprises a plurality of pixel circuits; the light-emitting element layer is located on the side, away from the substrate, of the driving circuit layer and comprises a plurality of light-emitting elements, the pixel circuit is connected with the light-emitting elements, and the pixel circuit is configured to drive the light-emitting elements to emit light; the cover plate is located on the side, away from the substrate, of the light-emitting element layer, the cover plate comprises a first cover plate base material and a hard coating located on one side of the first cover plate base material, materials of the hard coating comprise a first main body material and a doping material, and the doping material is ultraviolet light absorption particles. According to the embodiment of the invention, through the ultraviolet light absorbing particles dispersed in the hard coating, the hard coating plays a role in protecting and also plays an effective role in blocking ultraviolet light, so that the cover plate has reliable ultraviolet light blocking performance under the condition that the first cover plate base material is not changed.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies. More specifically, it relates to a display device. Background Art

[0002] For display panels of types such as organic light emitting diode (OLED) display panels, ultraviolet light (UV) in the environment can damage their display devices, affecting the service life of the display panels. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a display device to solve at least one of the problems existing in the prior art.

[0004] To achieve the above purpose, the present disclosure adopts the following technical solutions:

[0005] The present disclosure provides a display device, including:

[0006] A substrate;

[0007] A driving circuit layer, located on one side of the substrate, including a plurality of pixel circuits;

[0008] A light-emitting element layer, located on the side of the driving circuit layer away from the substrate, including a plurality of light-emitting elements, the pixel circuits are connected to the light-emitting elements, and the pixel circuits are configured to drive the light-emitting elements to emit light;

[0009] A cover plate, located on the side of the light-emitting element layer away from the substrate, the cover plate includes a first cover plate substrate and a hard coating on one side of the first cover plate substrate, the material of the hard coating includes a first main material and a doping material, and the doping material is an ultraviolet light absorbing particle.

[0010] Optionally, the thickness range of the hard coating is 3μm - 30μm.

[0011] Optionally, the cover plate further includes a first coating on the other side of the first cover plate substrate, and the material of the first coating includes a second main material and the doping material.

[0012] Optionally, the thickness range of the first coating is 0.1μm - 5μm.

[0013] Optionally, the cover plate further includes a first adhesive layer on the other side of the first cover plate substrate and a second cover plate substrate adhered to the first cover plate substrate through the first adhesive layer, and the material of the first adhesive layer includes a third main material and the doping material.

[0014] Optionally, the cover plate further includes a first adhesive layer on a side of the first coating away from the first cover plate substrate, and a second cover plate substrate adhered to the first coating through the first adhesive layer. The material of the first adhesive layer includes a third main material and the doping material.

[0015] Optionally, the display device further includes a second adhesive layer, a color film layer, and a first planar layer covering a side of the color film layer away from the light-emitting element layer, between the light-emitting element layer and the cover plate. The second adhesive layer is located between the first planar layer and the cover plate. The material of the second adhesive layer includes a fourth main material and the doping material. The material of the first planar layer includes a fifth main material and the doping material.

[0016] Optionally, the diameter range of the ultraviolet light absorbing particles is 1 nm - 300 nm.

[0017] Optionally, the display device further includes a packaging layer between the light-emitting element layer and the color film layer, and a touch layer between the packaging layer and the color film layer.

[0018] Optionally, the display device is a flexible display device.

[0019] The beneficial effects of the present disclosure are as follows:

[0020] The present disclosure can use the ultraviolet light absorbing particles dispersed in the hard coating of the cover plate, so that the hard coating can play an effective ultraviolet light blocking role while playing a protective role. Thus, the cover plate has reliable ultraviolet light blocking performance without changing the first cover plate substrate, and can be applicable to various types of first cover plate substrates, with advantages such as low cost and high adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes in detail the specific embodiments of the present disclosure with reference to the drawings.

[0022] Figure 1 A schematic diagram showing a display device provided by an embodiment of the present disclosure is shown.

[0023] Figure 2 A schematic diagram showing a sub-pixel region in the display device provided by an embodiment of the present disclosure is shown.

[0024] Figure 3 A schematic diagram showing another display device provided by an embodiment of the present disclosure is shown.

[0025] Figure 4 A schematic diagram showing another display device provided by an embodiment of the present disclosure is shown.

[0026] Figure 5 A schematic diagram showing another display device provided by an embodiment of the present disclosure is shown.

[0027] Figure 6 Another schematic diagram showing the display device provided by the embodiments of the present disclosure.

[0028] Figure 7 Another schematic diagram showing the display device provided by the embodiments of the present disclosure.

[0029] Figure 8 Another schematic diagram showing the display device provided by the embodiments of the present disclosure.

[0030] Figure 9 Another schematic diagram showing the display device provided by the embodiments of the present disclosure.

[0031] Figure 10 Comparison chart of the full-spectrum transmittance curves of the cover plate in the display device provided by the embodiments of the present disclosure and the comparative example. Detailed implementation manners

[0032] As used in the present disclosure, "on...", "formed on...", and "disposed on..." may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, that is, there are other layers between the two layers.

[0033] It should be noted that although terms such as "first", "second", etc. may be used herein to describe various components, members, elements, regions, layers, and / or parts, these components, members, elements, regions, layers, and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one component, member, element, region, layer, and / or part from another. Thus, for example, the first component, first member, first element, first region, first layer, and / or first part discussed below may be referred to as the second component, second member, second element, second region, second layer, and / or second part without departing from the teachings of the present disclosure.

[0034] In the present disclosure, unless otherwise specified, the term "co-layer setting" means that two layers, components, members, elements, or parts can be formed by the same preparation process (such as a patterning process, etc.), and generally, these two layers, components, members, elements, or parts are formed of the same material. For example, the co-layer setting of two or more functional layers means that these co-layered functional layers can be formed using the same material layer and the same preparation process, thereby simplifying the preparation process of the display substrate.

[0035] In the present disclosure, unless otherwise specified, the expression "patterning process" generally includes steps such as coating of photoresist, exposure, development, etching, stripping of photoresist, etc. The expression "one patterning process" means a process of forming a patterned layer, component, member, etc. using one mask.

[0036] For display panels such as OLED display panels, ultraviolet light in the environment can damage their display devices and affect the service life of the display panels.

[0037] In view of this, embodiments of the present disclosure provide a display device, including:

[0038] A substrate;

[0039] A driving circuit layer located on one side of the substrate, including a plurality of pixel circuits;

[0040] A light-emitting element layer located on the side of the driving circuit layer away from the substrate, including a plurality of light-emitting elements, the pixel circuits are connected to the light-emitting elements, and the pixel circuits are configured to drive the light-emitting elements to emit light;

[0041] A cover plate located on the side of the light-emitting element layer away from the substrate, including a first cover plate substrate and a hard coating on one side of the first cover plate substrate, the material of the hard coating includes a first main material and a doping material, and the doping material is an ultraviolet light-absorbing particle.

[0042] In a specific example, for example Figure 1 The shown display device includes:

[0043] Substrate 101;

[0044] A driving circuit layer 102 located on one side of the substrate 101, including a plurality of pixel circuits;

[0045] A light-emitting element layer 103 located on the side of the driving circuit layer 102 away from the substrate 101, including a plurality of light-emitting elements, the pixel circuits are connected to the light-emitting elements, and the pixel circuits are configured to drive the light-emitting elements to emit light;

[0046] A cover plate 110 located on the side of the light-emitting element layer 103 away from the substrate 101, the cover plate 110 includes a first cover plate substrate 1101 and a hard coating 1102 on the side of the first cover plate substrate 1101 away from the substrate 101, the material of the hard coating 1102 includes a first main material and a doping material, and the doping material is an ultraviolet light-absorbing particle 11021.

[0047] For example Figure 1The cover plate 110 in the display device shown disperses ultraviolet light absorbing particles 11021 in the hard coating 1102, so that the hard coating 1102 can effectively block ultraviolet light while playing a protective role, and can effectively block ultraviolet light with a wavelength below 400 nm. Thus, without changing the first cover plate substrate 1101, the cover plate has reliable ultraviolet light blocking performance, protecting display devices such as the light emitting element layer 103 in an OLED display device from the influence of ultraviolet light in the environment, avoiding damage to the display device caused by ultraviolet light in the environment, and being beneficial to improving the service life of the display device. For example Figure 1 The design of the hard coating 1102 with ultraviolet light blocking property adopted by the cover plate 110 in the display device shown can be applied to the first cover plate substrates 1101 of various materials and various sizes, and thus can be applied to various types of display devices, including flexible display devices using flexible cover plates, and has advantages such as low cost and high adaptability.

[0048] In a specific example, for example Figure 1 The preparation method of the hard coating (HardCoating, HC) 1102 in the cover plate 110 in the display device shown is, for example, coating and film forming on the first cover plate substrate 1101, and specific processes can be, for example, the sol-gel method, the hydrothermal synthesis method or the co-precipitation method, etc.

[0049] Exemplarily, the first main material of the hard coating 1102 can be, for example, epoxy resin, and can also be any one of acrylic resins, epoxy resins, urethane resins or polyester resins. The ultraviolet light absorbing particles 1021 can be, for example, organic substances such as phenols, benzoic acids, benzophenones, aminoketones, phenolic acid esters, benzotriazoles, etc., or can be inorganic substances such as metal oxides, metal salts, metal oxygen salts, etc., or can be a mixture of the above multiple substances.

[0050] In a possible implementation manner, the diameter range of the ultraviolet light absorbing particles is 1 nm - 300 nm.

[0051] In a specific example, for example Figure 1 In the cover plate 110 in the display device shown, the diameters of the ultraviolet light absorbing particles 11021 dispersed in the hard coating 1102 are 1 nm, 30 nm, 100 nm, 230 nm or 300 nm. Among them, on the basis of ensuring the absorption performance of ultraviolet light in the environment, the diameter of the ultraviolet light absorbing particles 11021 is preferably designed to be as small as possible, so that the optical quality of the cover plate is more excellent.

[0052] In a specific example, for example Figure 1In the cover plate 110 of the display device shown, the mass percentage range of the ultraviolet light absorbing particles 11021 as doping materials dispersed in the hard coating 1102 in the hard coating 1102 is 1%-40%. For example, the mass percentage is 1%, 5%, 12%, 28% or 40%.

[0053] In a specific example, for example Figure 1 In the cover plate 110 of the display device shown, the first cover plate substrate 1101 is, for example, a flexible cover plate substrate. The material of the first cover plate substrate 1101 can be polyethylene terephthalate (PET), colorless polyimide (CPI), thermoplastic polyurethane (TPU), polymethyl methacrylate (PMMA), ultra-thin glass (UTG), etc. The thickness range of the first cover plate substrate 1101 is, for example, 30μm - 200μm. For example, the thickness of the first cover plate substrate 1101 is 30μm, 55μm, 100μm, 148μm or 200μm.

[0054] In a possible implementation, the thickness range of the hard coating is 3μm - 30μm.

[0055] In a specific example, for example Figure 1 In the cover plate shown, the thickness range of the hard coating 1102 is 3μm - 30μm. For example, the thickness of the hard coating 1102 is 3μm, 8μm, 15μm, 22μm or 30μm.

[0056] In a specific example, for example Figure 1 The display device shown includes a plurality of sub-pixels. For example, it includes red sub-pixels, green sub-pixels and blue sub-pixels arranged in an array. The light emitting element layer 103 includes a pixel defining layer 1031 having a plurality of first openings 10311 and a light emitting layer located in the first openings 10311. The light emitting layer includes a red light emitting layer 10321 located in the red sub-pixel, a green light emitting layer 10322 located in the green sub-pixel and a blue light emitting layer 10323 located in the blue sub-pixel.

[0057] In a possible implementation, the display device provided in this embodiment further includes a second adhesive layer located between the light emitting element layer and the cover plate.

[0058] In a specific example, for example Figure 1 The display device shown further includes a second adhesive layer 120 located between the light emitting element layer 103 and the cover plate 110.

[0059] In a possible implementation, the display device provided in this embodiment further includes a color filter layer located between the light emitting element layer and the second adhesive layer and a first planarization layer covering the side of the color filter layer away from the light emitting element layer.

[0060] In a specific example, for instance Figure 1 The display device shown also includes a color filter layer 130 located between the light-emitting element layer 103 and the second adhesive layer 120, and a first planarization layer 140 covering the side of the color filter layer 130 away from the light-emitting element layer 103. The cover plate 110 is adhered to the first planarization layer 140 through the second adhesive layer 120.

[0061] In a possible implementation, the display device provided in this embodiment further includes a packaging layer located between the light-emitting element layer and the color filter layer.

[0062] In a specific example, for instance Figure 1 The display device shown also includes a packaging layer 104 located between the light-emitting element layer 103 and the color filter layer 130.

[0063] In a possible implementation, the display device provided in this embodiment further includes a touch control layer located between the packaging layer and the color filter layer.

[0064] In a specific example, for instance Figure 1 The display device shown also includes a touch control layer 150 located between the light-emitting element layer 104 and the color filter layer 130.

[0065] For example Figure 1 As shown, the color filter layer 130 is located on the side of the touch control layer 150 away from the substrate 101. The color filter layer 130 includes a black matrix layer 1301 having a plurality of second openings 13011 and a color filter layer located in the second openings 13011. The color filter layer includes a red light filter layer 13021 in the red sub-pixel, a green light filter layer 13022 in the green sub-pixel, and a blue light filter layer 13023 in the blue sub-pixel. The first planarization layer 140 covers the color filter layer and the black matrix layer 1301. The positive projection of the second opening 13011 of the black matrix layer 1301 on the substrate 101 covers the positive projection of the first opening 10311 of the pixel defining layer 1031 on the substrate 101.

[0066] The black matrix layer 1301 and the color filter layer 130 form a color filter structure. Among them, the light-emitting layer in the red sub-pixel is a red light-emitting layer 10321, and the color filter layer in the red sub-pixel is a red light filter layer 13021. The light-emitting layer in the green sub-pixel is a green light-emitting layer 10322, and the color filter layer in the green sub-pixel is a green light filter layer 13022. The light-emitting layer in the blue sub-pixel is a blue light-emitting layer 10323, and the color filter layer in the blue sub-pixel is a blue light filter layer 13023.

[0067] For example Figure 1As shown, the area of the orthographic projection of the second opening 13011 of the black matrix layer 1301 on the substrate 101 is larger than the area of the orthographic projection of the first opening 10311 of the pixel defining layer 1031 on the substrate 101, and the areas of the orthographic projections of the red light filtering layer 13021, the green light filtering layer 13022, and the blue light filtering layer 13023 on the substrate 101 are larger than the area of the orthographic projection of the second opening 13011 of the black matrix layer 1301 on the substrate 101, so as to ensure that the color film layer 130 does not affect the light extraction efficiency.

[0068] Figure 1 Shown is the structure of an OLED display panel integrating the color film layer 130, or color filter (CF) for short, into the color on encapsulation (COE) technology. Among them, the color film layer 130 can reduce ambient light reflection and improve light extraction efficiency. In addition, in order to reduce ambient light reflection, the OLED display panel can also be combined with a polarizer (POL), that is, a polarizer is provided between the cover plate and the touch layer.

[0069] In a possible implementation manner, the display device provided in this embodiment is a flexible display device.

[0070] Figure 2 Shows a schematic diagram of a red sub-pixel region in the display device provided in this embodiment to display the specific structures of film layers such as the driving circuit layer 102, the light emitting element layer 103, and the touch layer 150. For example Figure 2 As shown:

[0071] Taking the display device provided in this embodiment as a flexible display device as an example, the substrate 101 is, for example, a flexible substrate made of materials such as polyimide (PI), polyethylene naphthalate (PEN), and polyethylene terephthalate (PET). The flexible display device may further include a support layer on the light-emitting side opposite to the substrate 101.

[0072] The display device provided in this embodiment may include a barrier layer (not shown in the figure) and a buffer layer 201 between the substrate 101 and the driving circuit layer 102. For example, the barrier layer and the buffer layer 201 can be formed over the entire surface of the substrate 101. For example, the barrier layer can be made of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride, and the buffer layer 201 can also be made of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride. The barrier layer is beneficial to prevent water and oxygen from entering the OLED formed later from the bottom. The buffer layer 201 is beneficial to the quality of subsequent material deposition.

[0073] The driving circuit layer 102 can also be referred to as a thin film transistor (TFT) layer. For example Figure 2As shown, the pixel circuit in the driving circuit layer 102 includes an active layer (Active) 1021 formed on the buffer layer 201 by a patterning process, a first gate insulating layer (GI1) 1022 formed on the active layer 1021 by deposition or the like, a gate (Gate) 1023 of a thin-film transistor formed on the first gate insulating layer 1022 by a patterning process, a second gate insulating layer (GI2) 1024 formed on the gate 1023 by deposition or the like, an interlayer dielectric (ILD) 1025 formed on the second gate insulating layer 1024 by deposition or the like, a source-drain metal layer formed on the interlayer dielectric 1025 and a passivation layer (PVX) 1026 covering the source-drain metal layer and the interlayer dielectric 1025, a second planarization layer (PLN) 1027 covering the passivation layer 1026. The source-drain metal layer forms a source (Source) 10281 and a drain (Drain) 10282 of the thin-film transistor. For example, the source 10281 and the drain 10282 are electrically connected to the active layer 1021 through vias in the interlayer dielectric 1025, the second gate insulating layer 1024, and the first gate insulating layer 1022 respectively. The driving circuit layer 102 also includes, for example, a first electrode 10291 and a second electrode 10292 for forming a storage capacitor. For example, the first electrode 10291 is disposed on the same layer as the gate 1023, and the second electrode 10292 is formed on the second gate insulating layer 1024 by a patterning process and covered by the interlayer dielectric 1025. In addition to Figure 2 the thin-film transistor structure serving as a driving transistor shown, the pixel circuit in the driving circuit layer 102 may also include, for example, one or more other thin-film transistors, such as a plurality of thin-film transistors serving as switching transistors (not shown in the figure).

[0074] Among them, the active layer 1021 may be made of materials such as polysilicon and metal oxide. The first gate insulating layer 1022 and the second gate insulating layer 1024 may be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The interlayer dielectric 1025 may be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The passivation layer 1026 may be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The materials of the gate 1023, the first electrode 10291, and the second electrode 10292 include metals or alloy materials such as aluminum, titanium, cobalt, and molybdenum. The second planarization layer 1027 is, for example, an organic material.

[0075] For example Figure 2As shown, the light-emitting elements in the light-emitting element layer 103 include, for example, a pixel defining layer 1031, an anode 202, a red light-emitting layer (EL) 10321, and a cathode 203. The anode 202 is, for example, a metal oxide such as ITO or IZO, or a metal such as Ag, Al, or Mo, or an alloy material thereof. The anode 202 is electrically connected to the drain 10282 through a via formed in the second planarization layer. The electrical connection between the anode 202 and the drain 10282 realizes the connection between the pixel circuit and the light-emitting element.

[0076] The pixel defining layer 1031 can be formed by a patterning process, covering the edge of the anode 202 and exposing the surface of the anode 202 on the side away from the substrate 101. Exemplarily, the material of the pixel defining layer 1031 can include organic insulating materials such as negative photoresist, polyimide, and epoxy resin.

[0077] The red light-emitting layer 10321 is formed on the anode 202 exposed by the first opening formed in the pixel defining layer 1031. For example, the light-emitting element may further include an auxiliary light-emitting layer that helps the red light-emitting layer 10321 to emit light. The auxiliary light-emitting layer includes, for example, one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EIL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). The red light-emitting layer 10321 and the auxiliary light-emitting layer are, for example, organic material layers.

[0078] The cathode 203 is formed, for example, over the entire surface, covering the red light-emitting layer 10321 and the pixel defining layer 1031. The material of the cathode 203 can include metals such as Mg, Ca, Li, or Al, or alloys thereof, or metal oxides such as IZO or ZTO, or organic materials with conductive properties such as PEDOT / PSS (poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate).

[0079] For example Figure 2 As shown, the encapsulation layer 104 includes a first inorganic encapsulation layer 1041, an organic encapsulation layer 1042, and a second inorganic encapsulation layer 1043. For example, the first inorganic encapsulation layer 1041 and the second inorganic encapsulation layer 1043 are formed by deposition or the like. The organic encapsulation layer 1042 is formed by inkjet printing. For example, the first inorganic encapsulation layer 1041 and the second inorganic encapsulation layer 1043 can be formed of inorganic materials such as silicon nitride, silicon oxide, or silicon oxynitride, and the organic encapsulation layer 1042 can be formed of organic materials such as polyimide (PI) or epoxy resin. Thus, the first inorganic encapsulation layer 1041, the organic encapsulation layer 1042, and the second inorganic encapsulation layer 1043 are formed into a composite encapsulation layer, which can provide multiple protections for the functional structure of the OLED display device and has a better encapsulation effect.

[0080] For exampleFigure 2 As shown, the touch layer 150 is disposed on the light-emitting side of the encapsulation layer 104. The touch layer 150 can be referred to as a touch sensing panel (TSP) and is configured to sense the touch position. For example, the touch layer 150 includes a touch barrier layer (TB) 1501, a first touch metal layer (TMA) 1502, a touch insulation layer (TLD) 1503, a second touch metal layer (TMB) 1504, and a touch protection layer (TPL) 1505 that are sequentially stacked. For example, touch driving electrodes Tx and touch sensing electrodes Rx are formed in the second touch metal layer 1504, and a bridging portion is formed in the first touch metal layer 1502. The bridging portion connects the touch driving electrodes Tx formed in the second touch metal layer 1504 through conductive vias of the touch insulation layer 1503, and can also connect the touch sensing electrodes Rx formed in the second touch metal layer 1504 through conductive vias of the touch insulation layer 1503.

[0081] In a possible implementation manner, the cover plate of the display device provided in this embodiment further includes a first coating on the side of the first cover plate substrate close to the substrate. The material of the first coating includes a second host material and a doping material, and the doping material is an ultraviolet light absorbing particle. Thus, the ultraviolet light blocking performance of the cover plate can be further improved.

[0082] In a specific example, for example Figure 3 The cover plate 110` in the shown display device includes a first cover plate substrate 1101, a hard coating 1102 on the side of the first cover plate substrate 1101 away from the substrate 101, and a first coating 1103 on the side of the first cover plate substrate 1101 close to the substrate 101. The material of the hard coating 1102 includes a first host material and a doping material, ultraviolet light absorbing particles 11021. The material of the first coating 1103 includes a second host material and a doping material, ultraviolet light absorbing particles 11031.

[0083] Exemplarily, parameters such as the diameter range, mass ratio range, and material substance of the ultraviolet light absorbing particles 11031 dispersed in the first coating 1103 are the same as those of the ultraviolet light absorbing particles 11021 dispersed in the hard coating 1102.

[0084] In a specific example, for example Figure 3 In the cover plate 110` in the shown display device, the second host material of the first coating 1103 is, for example, an acrylic-based material.

[0085] In a possible implementation manner, the thickness range of the first coating is 0.1 μm - 5 μm.

[0086] In a specific example, for example Figure 3In the cover plate 110` of the display device shown, the thickness range of the first coating layer 1103 is 0.1 μm - 5 μm. For example, the thickness of the first coating layer 1103 is 0.1 μm, 0.6 μm, 2.5 μm, 3.8 μm, or 5 μm.

[0087] In a possible implementation, the cover plate of the display device provided in this embodiment further includes a first adhesive layer on the side of the first cover plate substrate close to the substrate, and a second cover plate substrate adhered to the first cover plate substrate through the first adhesive layer. The cover plate structure formed by the double-layer cover plate substrate has higher toughness and hardness, and can better protect the functional film layer of the display device.

[0088] In a specific example, for example Figure 4 The cover plate 110`` of the display device shown includes a first cover plate substrate 1101, a hard coating layer 1102 on the side of the first cover plate substrate 1101 away from the substrate 101, a first adhesive layer 1104 on the side of the first cover plate substrate 1101 close to the substrate 101, and a second cover plate substrate 1105 adhered to the first cover plate substrate 1101 through the first adhesive layer 1104. The material of the hard coating layer 1102 includes a first main material and a doped material, ultraviolet light absorbing particles 11021.

[0089] In a specific example, for example Figure 4 In the cover plate 110`` of the display device shown, the second cover plate substrate 1105 is, for example, a flexible cover plate substrate. The material of the second cover plate substrate 1105 can be ultra-thin glass (UTG), polyethylene terephthalate (PET), colorless polyimide (CPI), thermoplastic polyurethane (TPU), etc. The thickness range of the second cover plate substrate 1105 is, for example, 30 μm - 200 μm. For example, the thickness of the first cover plate substrate 101 is 30 μm, 58 μm, 105 μm, 153 μm, or 200 μm.

[0090] In a possible implementation, the material of the first adhesive layer includes a third main material and a doped material, and the doped material is ultraviolet light absorbing particles. Thus, the ultraviolet light blocking performance of the cover plate can be further improved.

[0091] In a specific example, for example Figure 5 In the cover plate 110``` of the display device shown, the material of the first adhesive layer 1104` includes a third main material and doped material ultraviolet light absorbing particles 11041.

[0092] Exemplarily, parameters such as the diameter range, mass percentage range, and material substance of the ultraviolet light absorbing particles 11041 dispersed in the first adhesive layer 1104` are the same as those of the ultraviolet light absorbing particles 11021 dispersed in the hard coating layer 1102.

[0093] In a specific example, for instance Figure 5 In the cover plate shown in Figure 5 , the third main material of the first adhesive layer 1104` is, for example, a transparent optical adhesive (OCA).

[0094] It should be noted that in the case where the cover plate in the display device provided in this embodiment further includes a first coating on the side of the first cover plate substrate close to the substrate, the second cover plate substrate is adhered to the first coating through the first adhesive layer.

[0095] In a specific example, for instance Figure 6 The cover plate 110```` in the display device shown in Figure 6 includes a first cover plate substrate 1101, a hard coating 1102 located on the side of the first cover plate substrate 1101 away from the substrate 101, a first coating 1103 located on the side of the first cover plate substrate 101 close to the substrate 101, a first adhesive layer 1104 located on the side of the first coating 1103 away from the first cover plate substrate 1101, and a second cover plate substrate 1105 adhered to the first coating 1103 through the first adhesive layer 1104. Among them, the material of the hard coating 1102 includes a first main material and a doped material, ultraviolet light absorbing particles 11021, and the material of the first coating 1103 includes a second main material and a doped material, ultraviolet light absorbing particles 11031.

[0096] In another specific example, different from Figure 6 the cover plate 110```` in the display device shown in Figure 6 , for instance Figure 7 in the cover plate 110````` in the display device shown in Figure 7 , the material of the first adhesive layer 1104` includes a third main material and a doped material, ultraviolet light absorbing particles 11041.

[0097] In a possible implementation manner, the material of the second adhesive layer includes a fourth main material and a doped material, and the doped material is ultraviolet light absorbing particles. Thereby, the ultraviolet light blocking performance of the light-emitting side film layer of the display panel in the display device can be further improved.

[0098] In a specific example, for instance Figure 8 in the display device shown in Figure 8 , the material of the second adhesive layer 120` includes a fourth main material and a doped material, ultraviolet light absorbing particles 1201.

[0099] Exemplarily, parameters such as the diameter range, mass percentage range, and material substance of the ultraviolet light absorbing particles 1201 dispersed in the second adhesive layer 120` are the same as those of the ultraviolet light absorbing particles 11021 dispersed in the hard coating 1102.

[0100] In a specific example, for instance Figure 8 in the display device shown in Figure 8 , the fourth main material of the second adhesive layer 120` is, for example, a transparent optical adhesive (OCA).

[0101] In a possible implementation, the material of the first flat layer includes a fifth host material and a doping material, and the doping material is an ultraviolet light absorbing particle. Thus, the ultraviolet light blocking performance of the film layer on the light-emitting side of the display panel in the display device can be further improved, and the integrated display panel, color film layer, and first flat layer can have ultraviolet light blocking performance when combined with the cover plate, which can be applied to more types of cover plates.

[0102] In a specific example, for example Figure 9 In the shown display device, the material of the first flat layer 140` includes a fifth host material and a doping material, ultraviolet light absorbing particles 1401.

[0103] Exemplarily, parameters such as the diameter range, mass ratio range, and material substance of the ultraviolet light absorbing particles 1401 dispersed in the first flat layer 140` are the same as those of the ultraviolet light absorbing particles 11021 dispersed in the hard coating 1102.

[0104] In a specific example, for example Figure 9 In the shown display device, the fifth host material of the first flat layer 140` is, for example, organic carbon (OC), and the thickness range of the first flat layer 140` is 2μm - 4μm. For example, the thickness of the first flat layer 140` is 2μm, 2.5μm, 3μm, 3.5μm, or 4μm.

[0105] Taking Figure 4 the shown display device as a flexible OLED display device as an example, the inventor actually tested the ultraviolet light blocking performance of the cover plate 110`` including the hard coating 1102 doped with ultraviolet light absorbing particles 11021 with a thickness of 5μm in combination with the ultraviolet light aging test. The test conditions and test results are described below.

[0106] The test conditions for the ultraviolet light aging test are as follows: 12 tests are conducted, and the duration of each test is 8 hours, including 4 hours of ultraviolet light irradiation and 4 hours of moisture exposure. Among them, the conditions for ultraviolet light irradiation are: ultraviolet light with a wavelength of 340nm and an intensity of 0.63W / m 2 / nm, and the temperature is 60°C. The temperature for moisture exposure is 50°C.

[0107] The test comparison objects include four:

[0108] (1) The cover plate 110`` in the flexible OLED display device shown as in Figure 4 which the ultraviolet light cut-off wavelength is 380nm, as Example 1;

[0109] (2) The cover plate 110`` in the flexible OLED display device shown as in Figure 4The cover plate 110`` in the flexible OLED display device shown, as Example 2;

[0110] (3) A cover plate including a cover plate substrate without ultraviolet light blocking performance, as Comparative Example 1;

[0111] (4) A cover plate including a cover plate substrate with ultraviolet light blocking performance and a hard coating without ultraviolet light blocking performance, as Comparative Example 2.

[0112] The test results of Example 1 and Example 2 are shown in Table 1, and the test results of Comparative Example 1 and Comparative Example 2 are shown in Table 2.

[0113] Table 1

[0114]

[0115]

[0116] Table 2

[0117]

[0118] Taking Example 1 in Table 1 as an example, for the cover plate 110`` in the flexible OLED display device shown with an ultraviolet cut-off wavelength of 380 nm in Example 1: Figure 4 as shown:

[0119] Before the ultraviolet light aging test, its transmittance for light with a wavelength of 380 nm (@380(%)) was 0.84%, its transmittance for light with a wavelength of 460 nm (@460(%)) was 90.53%, and its comprehensive transmittance for visible light (T(%)) was 91.44%.

[0120] After the ultraviolet light aging test, its transmittance for light with a wavelength of 380 nm (@380(%)) was 0.77%, its transmittance for light with a wavelength of 460 nm (@460(%)) was 90.71%, and its comprehensive transmittance for visible light (T(%)) was 91.63%. Before and after the ultraviolet light aging test, the hue change value ΔE was 0.43 (the hue index a* reflecting red or green bias and the hue index b* reflecting yellow or blue bias are shown in Table 1). The hue change value ΔE meets the requirement that the hue change is less than or equal to 3, and the hue change value can pass the ultraviolet light aging test requirement.

[0121] As a comparison, before the ultraviolet light aging test, for the cover plate of Comparative Example 2, which includes a cover plate substrate with ultraviolet light blocking performance and a hard coating without ultraviolet light blocking performance, as shown in Table 2, its light transmittance at a wavelength of 380 nm (@380 (%)) is 12.50%, its light transmittance at a wavelength of 460 nm (@460 (%)) is 90.09%, and its comprehensive light transmittance for visible light (T (%)) is 90.47%.

[0122] For Example 1, Example 2, Comparative Example 1, and Comparative Example 2, the light transmittance curves for the full spectrum of visible light before and after the ultraviolet light aging test are as Figure 10 shown.

[0123] Combining the above, it can be seen that the cover plate 110`` in the flexible OLED display device shown in Figure 4 with an ultraviolet cut-off wavelength of 380 nm has better ultraviolet light blocking performance, higher visible light transmittance, and the cover plate 110`` in the flexible OLED display device shown in Figure 4 with an ultraviolet cut-off wavelength of 380 nm has excellent ultraviolet light aging resistance.

[0124] The display device provided by the embodiments of the present disclosure can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., and the present embodiment does not limit this.

[0125] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, rather than limitations on the implementation manners of the present disclosure. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present disclosure still fall within the protection scope of the present disclosure.

Claims

1. A display device, characterized in that, Comprising: Substrate; Drive circuit layer, located on one side of the substrate, including a plurality of pixel circuits; Light-emitting element layer, located on the side of the drive circuit layer away from the substrate, including a plurality of light-emitting elements, the pixel circuits are connected to the light-emitting elements, and the pixel circuits are configured to drive the light-emitting elements to emit light; Cover plate, located on the side of the light-emitting element layer away from the substrate, the cover plate includes a first cover plate substrate and a hard coating located on one side of the first cover plate substrate, the material of the hard coating includes a first main material and a doping material, and the doping material is an ultraviolet light-absorbing particle.

2. The display device according to claim 1, characterized in that, The thickness range of the hard coating is 3μm - 30μm.

3. The display device according to claim 1, characterized in that, The cover plate further includes a first coating located on the other side of the first cover plate substrate, and the material of the first coating includes a second main material and the doping material.

4. The display device according to claim 3, characterized in that, The thickness range of the first coating is 0.1μm - 5μm.

5. The display device according to claim 1, characterized in that, The cover plate further includes a first adhesive layer located on the other side of the first cover plate substrate and a second cover plate substrate adhered to the first cover plate substrate through the first adhesive layer, and the material of the first adhesive layer includes a third main material and the doping material.

6. The display device according to claim 3, characterized in that, The cover plate further includes a first adhesive layer located on the side of the first coating away from the first cover plate substrate and a second cover plate substrate adhered to the first coating through the first adhesive layer, and the material of the first adhesive layer includes a third main material and the doping material.

7. The display device according to claim 1, characterized in that, The display device further includes a second adhesive layer, a color filter layer, and a first planarization layer covering the side of the color filter layer away from the light-emitting element layer, between the light-emitting element layer and the cover plate, the second adhesive layer is located between the first planarization layer and the cover plate, the material of the second adhesive layer includes a fourth main material and the doping material, and the material of the first planarization layer includes a fifth main material and the doping material.

8. The display device according to any one of claims 1-7, characterized in that, The diameter range of the ultraviolet light-absorbing particles is 1nm - 300nm.

9. The display device according to claim 7, characterized in that, The display device further includes a packaging layer between the light-emitting element layer and the color filter layer and a touch layer between the packaging layer and the color filter layer.

10. The display device according to claim 1, characterized in that, The display device is a flexible display device.

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