Display device

Abstract

The embodiment of the utility model 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 technology, and more specifically, to a display device. Background Art

[0002] For display panels such as organic light emitting diode (OLED) display panels, ultraviolet light (UV) in the environment may damage the display components and reduce the service life of the display panel. Utility Model Content

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

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

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

[0006] 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 a side of the driving circuit layer away from the substrate, comprising a plurality of light emitting elements, the pixel circuit being connected to the light emitting elements, and the pixel circuit being configured to drive the light emitting elements to emit light;

[0009] The cover plate is 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 layer located on one side of the first cover plate substrate. The material of the hard coating layer includes a first main material and a doping material. The doping material is ultraviolet light absorbing particles.

[0010] Optionally, the hard coating has a thickness ranging from 3 μm to 30 μm.

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

[0012] Optionally, the first coating has a thickness ranging from 0.1 μm to 5 μm.

[0013] Optionally, 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 bonded to the first cover plate substrate via 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 comprises a first bonding layer located on a side of the first coating layer away from the first cover plate substrate and a second cover plate substrate bonded to the first coating layer via the first bonding layer, and the material of the first bonding layer comprises a third main material and the doping material.

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

[0016] Optionally, the diameter of the ultraviolet light absorbing particles ranges from 1 nm to 300 nm.

[0017] Optionally, the display device further includes an encapsulation layer located between the light-emitting element layer and the color filter layer, and a touch control layer located between the encapsulation layer and the color filter 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 invention can disperse ultraviolet light absorbing particles 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, thereby making the cover plate have reliable ultraviolet light blocking performance without changing the first cover plate substrate. It can be applicable to various types of first cover plate substrates and has the advantages of low cost, high adaptability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation methods of the present disclosure are further described in detail below with reference to the accompanying drawings.

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

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

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

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

[0027] Figure 6 Another schematic diagram of a display device provided by an embodiment of the present disclosure is shown.

[0028] Figure 7 Another schematic diagram of a display device provided by an embodiment of the present disclosure is shown.

[0029] Figure 8 Another schematic diagram of a display device provided by an embodiment of the present disclosure is shown.

[0030] Fig. 9 Another schematic diagram of a display device provided by an embodiment of the present disclosure is shown.

[0031] Fig.10 A comparison chart of full-spectrum transmittance curves of the cover plate in the display device provided by the embodiment of the present disclosure and the comparative example is shown. DETAILED DESCRIPTION

[0032] The terms “on”, “formed on” and “disposed on” in the present disclosure 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, i.e., there are other layers between the two layers.

[0033] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, 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 "same-layer arrangement" used refers to two layers, parts, components, elements or parts that can be formed by the same preparation process (such as a patterning process, etc.), and the two layers, parts, components, elements or parts are generally formed of the same material. For example, two or more functional layers are arranged in the same layer, which means that these functional layers arranged in the same layer 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 photoresist coating, exposure, development, etching, photoresist stripping, etc. The expression "one-time patterning process" means a process of forming patterned layers, components, members, etc. using one mask.

[0036] For display panels such as OLED display panels, ultraviolet light in the environment may damage the display components and reduce the service life of the display panels.

[0037] In view of this, an embodiment of the present disclosure provides a display device, including:

[0038] 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 a side of the driving circuit layer away from the substrate, comprising a plurality of light emitting elements, the pixel circuit being connected to the light emitting elements, and the pixel circuit being configured to drive the light emitting elements to emit light;

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

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

[0043] Substrate 101;

[0044] The driving circuit layer 102 is located on one side of the substrate 101 and includes a plurality of pixel circuits;

[0045] The light emitting element layer 103 is located on a side of the driving circuit layer 102 away from the substrate 101, and includes 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] The cover plate 110 is 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 layer 1102 located on the side of the first cover plate substrate 1101 away from the substrate 101. The material of the hard coating layer 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 has ultraviolet light absorbing particles 11021 dispersed in the hard coating 1102, so that the hard coating 1102 plays an effective ultraviolet light blocking role while playing a protective role, and can effectively block ultraviolet light with a wavelength below 400nm, so that the cover plate has reliable ultraviolet light blocking performance without changing the first cover plate substrate 1101, protecting the display device such as the light-emitting element layer 103 in the 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 helping to increase the service life of the display device. Figure 1 The cover plate 110 in the display device shown is designed with a hard coating 1102 with ultraviolet light blocking properties, which can be applied to first cover plate substrates 1101 of various materials and sizes, and thus can be applied to various types of display devices, including flexible display devices using flexible cover plates, and has the advantages of low cost and high adaptability.

[0048] In a specific example, for example Figure 1 The hard coating (HC) 1102 in the cover plate 110 in the display device shown is prepared by, for example, coating the first cover plate substrate 1101 to form a film. The specific process may be, for example, a sol-gel method, a hydrothermal synthesis method or a co-precipitation method.

[0049] For example, the first main material of the hard coating 1102 is epoxy resin, and may also be any one of acrylic resin, epoxy resin, urethane resin or polyester resin. The ultraviolet light absorbing particles 1021 may be organic substances such as phenol, benzoic acid, benzophenone, aminoketone, phenolic acid ester, benzophenone, etc., or inorganic substances such as metal oxides, metal acid salts, metal oxygen salts, etc., or a mixture of the above multiple substances.

[0050] In a possible implementation, the diameter of the ultraviolet light absorbing particles ranges from 1 nm to 300 nm.

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

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

[0053] In a specific example, for example Figure 1 In the cover plate 110 in 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 hard coating has a thickness ranging from 3 μm to 30 μm.

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

[0056] In a specific example, for example Figure 1 The display device shown includes multiple sub-pixels, for example, 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 multiple 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 manner, 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 flat layer covering a side of the color filter layer away from the light emitting element layer.

[0060] In a specific example, for example Figure 1 The display device shown further includes a color filter layer 130 located between the light emitting element layer 103 and the second adhesive layer 120 and a first planar layer 140 covering the color filter layer 130 on a side away from the light emitting element layer 103 . The cover plate 110 is bonded to the first planar layer 140 via the second adhesive layer 120 .

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

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

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

[0064] In a specific example, for example Figure 1 The display device shown further 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 layer 150 away from the substrate 101, and the color filter layer 130 includes a black matrix layer 1301 having a plurality of second openings 13011 and a filter layer located in the second openings 13011, and the filter layer includes a red filter layer 13021 located in the red sub-pixel, a green filter layer 13022 located in the green sub-pixel, and a blue filter layer 13023 located in the blue sub-pixel. The first flat layer 140 covers the filter layer and the black matrix layer 1301, and the orthographic projection of the second openings 13011 of the black matrix layer 1301 on the substrate 101 covers the orthographic projection of the first openings 10311 of the pixel defining layer 1031 on the substrate 101.

[0066] The black matrix layer 1301 and the filter layer 1302 form a color filter structure. Among them, the light-emitting layer in the red sub-pixel is the red light-emitting layer 10321, and the filter layer in the red sub-pixel is the red light filter layer 13021, the light-emitting layer in the green sub-pixel is the green light-emitting layer 10322, and the filter layer in the green sub-pixel is the green light filter layer 13022, the light-emitting layer in the blue sub-pixel is the blue light-emitting layer 10323, and the filter layer in the blue sub-pixel is the 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 area of ​​the orthographic projection of the red light filter layer 13021, the green light filter layer 13022, and the blue light filter layer 13023 on the substrate 101 is 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 filter layer 130 will not affect the light output efficiency.

[0068] Figure 1 The structure shown is an OLED display panel combined with a color filter layer 130 or a color filter (CF) integrated into a color on encapsulation layer (COE) technology, wherein the color filter 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 set 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 A schematic diagram of a red sub-pixel region in the display device provided in this embodiment is shown to demonstrate the specific structures of the film layers such as the driving circuit layer 102, the light-emitting element layer 103 and the touch layer 150. 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 a flexible substrate made of polyimide (PI), polyethylene naphthalate (PEN), thermoplastic polyester (PET), etc. The flexible display device may also include a support layer located on the back side of the substrate 101 facing away from the light output.

[0072] The display device provided in this embodiment may include a barrier layer (Barrier) (not shown in the figure) and a buffer layer (Buffer) 201 located between the substrate 101 and the driving circuit layer 102. For example, the barrier layer and the buffer layer 201 can be formed on the entire surface of the substrate 101. For example, the barrier layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, and the buffer layer 201 can also be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The barrier layer is beneficial to blocking 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 may also be referred to as a thin film transistor (TFT) layer. 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, and a dielectric layer (I2) 1025 formed on the second gate insulating layer 1024 by deposition or the like. The active layer 1021 includes an active layer 10291 and an active layer 10292. The active layer 10291 includes an active layer 10292 and an active layer 10293. The active layer 10291 includes an active layer 10293 and an active layer 10294. The active layer 10291 includes an active layer 10294 and an active layer 10295. The active layer 10291 includes an active layer 10291 and an active layer 10292. The active layer 10291 includes an active layer 10292 and an active layer 10293 ... Figure 2 In addition to the thin film transistor structure used as the driving transistor, the pixel circuit in the driving circuit layer 102 may also include one or more other thin film transistors, for example, multiple thin film transistors used as switching transistors (not shown in the figure).

[0074] Among them, the active layer 1021 can be made of materials such as polysilicon and metal oxide, the first gate insulating layer 1022 and the second gate insulating layer 1024 can be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, the dielectric layer 1025 can be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, and the passivation layer 1026 can 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 planar layer 1027 is, for example, an organic material.

[0075] For example Figure 2As shown, the light-emitting element in the light-emitting element layer 103 includes, 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, IZO, or a metal such as Ag, Al, Mo, or an alloy thereof. The anode 202 is, for example, electrically connected to the drain 10282 through a via hole provided in the second flat 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 may be formed by a patterning process, covering the edge of the anode 202 and exposing the surface of the anode 202 away from the substrate 101. For example, the material of the pixel defining layer 1031 may 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 of 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 emit light, and the auxiliary light emitting layer may include, for example, one or more film layers 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 on the entire surface, for example, covering the red light emitting layer 10321 and the pixel defining layer 1031. The material of the cathode 203 may include metals such as Mg, Ca, Li or Al or their alloys, or metal oxides such as IZO and 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 by inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, and the organic encapsulation layer 1042 can be formed by organic materials such as polyimide (PI) and 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 form multiple protections for the functional structure of the OLED display device and has a better encapsulation effect.

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

[0081] In a possible implementation, the cover plate of the display device provided in this embodiment further includes a first coating layer located on the side of the first cover plate substrate close to the substrate, and the material of the first coating layer includes a second main material and a doping material, and the doping material is ultraviolet light absorbing particles. 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 display device shown includes a first cover plate substrate 1101, a hard coating layer 1102 located on the side of the first cover plate substrate 1101 away from the substrate 101, and a first coating layer 1103 located on the side of the first cover plate substrate 1101 close to the substrate 101, the material of the hard coating layer 1102 includes a first main material and dopant material ultraviolet light absorbing particles 11021, and the material of the first coating layer 1103 includes a second main material and dopant material ultraviolet light absorbing particles 11031.

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

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

[0085] In a possible implementation, the thickness of the first coating layer ranges from 0.1 μm to 5 μm.

[0086] In a specific example, for example Figure 3In the cover plate 110 in the display device shown, the thickness of the first coating layer 1103 is in the range of 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 in the display device provided in this embodiment further includes a first adhesive layer located on the side of the first cover plate substrate close to the substrate and a second cover plate substrate bonded to the first cover plate substrate through the first adhesive layer. The cover plate structure formed by the double-layer cover plate substrate has high 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 in the display device shown includes a first cover plate substrate 1101, a hard coating layer 1102 located on the side of the first cover plate substrate 1101 away from the substrate 101, a first bonding layer 1104 located on the side of the first cover plate substrate 1101 close to the substrate 101, and a second cover plate substrate 1105 bonded to the first cover plate substrate 1101 through the first bonding layer 1104. The material of the hard coating layer 1102 includes a first main material and doping material ultraviolet light absorbing particles 11021.

[0089] In a specific example, for example Figure 4 In the cover plate 110 '' in 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, 30μm-200μm. For example, the thickness of the first cover plate substrate 101 is 30μm, 58μm, 105μm, 153μm or 200μm.

[0090] In a possible implementation, the material of the first adhesive layer includes a third main material and a doping material, and the doping material is ultraviolet light absorbing particles, thereby further improving the ultraviolet light blocking performance of the cover plate.

[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 doping material ultraviolet light absorbing particles 11041 .

[0092] Exemplarily, the diameter range, mass percentage range, material substance and other parameters 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 example Figure 5 In the illustrated cover plate, the third main material of the first adhesive layer 1104 is, for example, transparent optical adhesive (OCA).

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

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

[0096] In another specific example, with Figure 6 The cover plate 110 in the display device shown is different in that, for example Figure 7 In the cover plate 110 ″″″″″″ in the display device shown, the material of the first adhesive layer 1104 ″ includes a third main material and doping material ultraviolet light absorbing particles 11041 .

[0097] In a possible implementation, the material of the second adhesive layer includes a fourth main material and a doping material, and the doping material is ultraviolet light absorbing particles. 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.

[0098] In a specific example, for example Figure 8 In the display device shown, the material of the second adhesive layer 120 ′ includes a fourth host material and doping material ultraviolet light absorbing particles 1201 .

[0099] Exemplarily, the diameter range, mass percentage range, material substance and other parameters 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 layer 1102 .

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

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

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

[0103] Exemplarily, the diameter range, mass percentage range, material substance and other parameters 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 layer 1102 .

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

[0105] by Figure 4 Taking the display device shown as a flexible OLED display device as an example, the inventors combined the UV aging test to actually test the UV blocking performance of the cover plate 110ˋˋ including a 5 μm thick hard coating 1102 doped with UV absorbing particles 11021 against the UV light in the environment. The test conditions and test results are described below.

[0106] The test conditions of the UV aging test are: 12 tests, each test lasting 8 hours, including 4 hours of UV exposure and 4 hours of moisture exposure. The UV exposure conditions are: wavelength 340nm, intensity 0.63W / m 2 / nm ultraviolet light, temperature 60°C. The temperature of moisture exposure is 50°C.

[0107] The test comparison objects include four:

[0108] (1) The UV cutoff wavelength is 380nm. Figure 4 The cover plate 110 ˋ ˋ in the flexible OLED display device shown is used as Example 1;

[0109] (2) The UV cutoff wavelength is 400nm. Figure 4The cover plate 110 ˋ ˋ in the flexible OLED display device shown is used as Example 2;

[0110] (3) a cover plate including a cover plate substrate having no ultraviolet light blocking performance, as comparative example 1;

[0111] (4) A cover plate including a cover plate substrate having ultraviolet light blocking performance and a hard coating layer without ultraviolet light blocking performance is used 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 ultraviolet light cutoff wavelength of Example 1 being 380 nm, Figure 4 The cover plate 110 in the flexible OLED display device shown:

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

[0120] After the UV aging test, its transmittance to light with a wavelength of 380nm (@380(%)) is 0.77%, its transmittance to light with a wavelength of 460nm (@460(%)) is 90.71%, and its comprehensive transmittance to visible light (T(%)) is 91.63%. Before and after the UV aging test, the hue change value ΔE is 0.43 (the hue index a* reflecting reddish or greenish and the hue index b* reflecting yellowish or bluish are shown in Table 1), and 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 UV aging test requirements.

[0121] In comparison, before the UV aging test, for the cover plate of Comparative Example 2 including a cover plate substrate having UV blocking properties and a hard coating layer without UV blocking properties, as shown in Table 2, its transmittance for light with a wavelength of 380 nm (@380(%)) was 12.50%, its transmittance for light with a wavelength of 460 nm (@460(%)) was 90.09%, and its comprehensive transmittance for visible light (T(%)) was 90.47%.

[0122] Example 1, Example 2, Comparative Example 1 and Comparative Example 2, the transmittance curves for full spectrum visible light before and after the UV aging test are as follows: Fig.10 shown.

[0123] Combining the above, we can see that the ultraviolet light cut-off wavelength is 380nm. Figure 4 The cover plate 110 in the flexible OLED display device shown in the figure has better UV light blocking performance, higher visible light transmittance, and a UV light cutoff wavelength of 380 nm. Figure 4 The cover plate 110 in the flexible OLED display device shown has excellent resistance to ultraviolet light aging.

[0124] The display device provided in the embodiment of the present disclosure may 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 this embodiment does not limit this.

[0125] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not limitations on the implementation methods of the present disclosure. For ordinary technicians in this field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A display device, characterized in that: include: substrate; A driving circuit layer, located on one side of the substrate, including a plurality of pixel circuits; A light emitting element layer, located on a side of the driving circuit layer away from the substrate, comprising a plurality of light emitting elements, the pixel circuit being connected to the light emitting elements, and the pixel circuit being configured to drive the light emitting elements to emit light; A cover plate is located on a side of the light-emitting element layer away from the substrate, the cover plate comprises a first cover plate substrate and a hard coating layer located on one side of the first cover plate substrate, the material of the hard coating layer comprises a first main material and a doping material, the doping material is ultraviolet light absorbing particles, The first main material is epoxy resin, acrylic resin, epoxy resin, urethane resin or polyester resin.

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

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

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

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

6. The display device according to claim 3, characterized in that: The cover plate also 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 bonded 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. The third main material is transparent optical glue.

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

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

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

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