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WO2022252269A1 - 一种盖板及显示装置 - Google Patents

一种盖板及显示装置 Download PDF

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Publication number
WO2022252269A1
WO2022252269A1 PCT/CN2021/099126 CN2021099126W WO2022252269A1 WO 2022252269 A1 WO2022252269 A1 WO 2022252269A1 CN 2021099126 W CN2021099126 W CN 2021099126W WO 2022252269 A1 WO2022252269 A1 WO 2022252269A1
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WO
WIPO (PCT)
Prior art keywords
cover
layer
cover plate
cover layer
equal
Prior art date
Application number
PCT/CN2021/099126
Other languages
English (en)
French (fr)
Inventor
赵宸
Original Assignee
武汉华星光电技术有限公司
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电技术有限公司, 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US17/593,912 priority Critical patent/US12120939B2/en
Publication of WO2022252269A1 publication Critical patent/WO2022252269A1/zh

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present application relates to the field of display technology, in particular to a cover plate and a display device.
  • OLED Organic Light Emitting Diode (organic light-emitting diode) display panels are gradually entering consumer electronics such as mobile devices and televisions due to their high luminous efficiency, wide viewing angle, fast response speed, ultra-thin, light weight, and can be fabricated on flexible substrates. market.
  • transparent glass is generally selected as the cover plate of the OLED display panel, and the refractive index of the glass is generally 1.4-1.5, and the refractive index of the organic light-emitting layer of the OLED display panel is generally 1.7-1.8. Therefore, when the light emitted by the organic light-emitting layer passes through the glass and enters the air, due to the principle of total reflection, most of the light will return to the organic light-emitting layer, resulting in a greatly reduced light extraction efficiency of the entire display device. Therefore, how to improve the light extraction efficiency of the display device has become a research and development hotspot for technicians.
  • This application provides a cover plate, which is used to solve the problem that the cover plate of the prior art uses glass, and the refractive index of the glass is lower than that of the organic light-emitting layer. Due to the principle of total reflection, most of the light emitted by the organic light-emitting layer returns to the organic light-emitting layer. layer, leading to the technical problem of low light extraction efficiency of the display device.
  • An embodiment of the present application provides a cover, including a first cover layer and a second cover layer, the first cover layer is located on the light-incident side of the cover; the second cover layer is located on the The light-emitting side of the cover plate is attached to the first surface of the first cover plate layer; wherein, the first surface of the first cover plate layer is provided with a plurality of protrusions, and the first cover plate layer The refractive index is lower than the refractive index of the second cover layer.
  • the cross-sectional width of the protrusion is greater than or equal to 10 microns and less than or equal to 30 microns.
  • the cover plate includes a bending area and a non-bending area, and the section width of the protrusion located in the bending area is larger than that of the protrusion located in the non-bending area. Raised section width.
  • the cross-sectional width of the protrusion gradually decreases from the bending area to the non-bending area.
  • the thickness of the first cover layer or the second cover layer is greater than or equal to 30 microns and less than or equal to 70 microns.
  • the height of the protrusion is greater than or equal to one third of the thickness of the second cover plate layer and less than or equal to one third of the thickness of the second cover plate layer of two.
  • the cross-sectional shape of the protrusion is semicircle, semiellipse, triangle or rectangle.
  • the material of the first cover layer is ultra-thin glass
  • the material of the second cover layer is any one of titanium dioxide, tantalum pentoxide, and hafnium oxide .
  • the material of the second cover layer is transparent polyimide
  • the material of the first cover layer is alumina or silicon dioxide.
  • the refractive index of the second cover plate layer is greater than or equal to 1.5.
  • An embodiment of the present application also provides a display device, including a flexible display panel and a cover disposed on the flexible display panel, the cover includes a first cover layer and a second cover layer, the first The cover layer is located on the light incident side of the cover; the second cover layer is located on the light output side of the cover, and is attached to the first surface of the first cover layer; wherein, the second The first surface of a cover layer is provided with a plurality of protrusions, and the refractive index of the first cover layer is lower than that of the second cover layer.
  • the cross-sectional width of the protrusion is greater than or equal to 10 microns and less than or equal to 30 microns.
  • the cover plate includes a bending area and a non-bending area, and the cross-sectional width of the protrusion located in the bending area is larger than that of the protrusion located in the non-bending area. Raised section width.
  • the cross-sectional width of the protrusion gradually decreases from the bending area to the non-bending area.
  • the thickness of the first cover layer or the second cover layer is greater than or equal to 30 microns and less than or equal to 70 microns.
  • the height of the protrusion is greater than or equal to one third of the thickness of the second cover layer and less than or equal to one third of the thickness of the second cover layer of two.
  • the cross-sectional shape of the protrusion is semicircle, semiellipse, triangle or rectangle.
  • the material of the first cover layer is ultra-thin glass
  • the material of the second cover layer is any one of titanium dioxide, tantalum pentoxide, and hafnium oxide.
  • the material of the second cover layer is transparent polyimide
  • the material of the first cover layer is alumina or silicon dioxide.
  • the refractive index of the second cover layer is greater than or equal to 1.5.
  • a cover provided by the present application includes a first cover layer and a second cover layer, the first cover layer is located on the light-incident side of the cover; the second cover layer is located on the cover The light-emitting side of the plate, and is attached to the first surface of the first cover layer; wherein, the first surface of the first cover layer is provided with a plurality of protrusions, and the first cover layer The refractive index is lower than the refractive index of the second cover layer.
  • a plurality of protrusions are provided on the first surface of the first cover layer to attach the second cover layer to the first surface of the first cover layer, and the refraction of the first cover layer
  • the refractive index is lower than the refractive index of the second cover layer, so that the light emitted by the organic light-emitting layer of the OLED display panel is directed from the low-refractive-index film layer to the high-refractive-index film layer, reducing the light loss caused by total reflection.
  • a plurality of protrusions form a micro-lens array to converge the light on the light-emitting side of the cover plate, thereby increasing the light-emitting efficiency of the entire display device.
  • FIG. 1 is a schematic diagram of the basic structure of the cover plate provided by the embodiment of the present application.
  • FIG. 2 is a schematic diagram of the basic structure of another cover plate provided by the embodiment of the present application.
  • FIG. 3 is a schematic diagram of a basic structure of a display device provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of the basic structure of the cover plate provided by the embodiment of the present application.
  • the cover plate 10 includes a first cover plate layer 101 and a second cover plate layer 102.
  • the first cover plate layer 101 is located on the The light incident side of the cover plate 10;
  • the second cover plate layer 102 is located on the light emitting side of the cover plate 10, and is attached to the first surface S1 of the first cover plate layer 101; wherein, the first The first surface S1 of the cover layer 101 is provided with a plurality of protrusions 103 , and the refractive index of the first cover layer 101 is lower than that of the second cover layer 102 .
  • the light incident side of the cover plate 10 refers to the side where the OLED display panel (not shown) is placed, and the light output side of the cover plate 10 refers to the side away from the OLED display panel.
  • the second cover layer 102 being attached to the first surface S1 of the first cover layer 101 means that the second cover layer 102 completely covers the first surface S1 of the first cover layer 101 A plurality of protrusions 103.
  • a plurality of protrusions 103 are provided on the first surface S1 of the first cover layer 101 to adhere the second cover layer 102 to the first surface S1 of the first cover layer 101 , and the refractive index of the first cover layer 101 is lower than the refractive index of the second cover layer 102, so that the light emitted by the organic light-emitting layer of the OLED display panel Layer 101, optically thinning medium) shoots to the high refractive index film layer (that is, the second cover layer 102, optically dense medium), which reduces the light loss caused by total reflection, and a plurality of protrusions 103 are arranged to form a microlens array, which will The light is converged on the light-emitting side of the cover plate 10, which increases the light-emitting efficiency of the entire display device.
  • the cross-sectional width of the protrusion 103 is greater than or equal to 10 microns and less than or equal to 30 microns, and the cross-sectional shape of the protrusion 103 is semicircle, semi-ellipse, triangle or rectangle.
  • the thickness of the first cover layer 101 or the second cover layer 102 is greater than or equal to 30 microns and less than or equal to 70 microns, and the height of the protrusions 103 is greater than or equal to that of the second cover layer 102 One-third of the thickness and less than or equal to two-thirds of the thickness of the second cover layer 102 .
  • the material of the first cover layer 101 is ultra-thin glass or transparent polyimide.
  • transparent polyimide has good bending performance, but its optical performance is average, and it needs to be coated with a hard film to improve the surface hardness to a limited extent, which means that repeated folding is prone to creases, and its scratch resistance is average. , if it is pressed against or scratched by a hard object, it is easy to cause scratches or even bad spots on the surface of the cover.
  • ultra-thin glass has better optical properties, high surface hardness, excellent rebound performance, and no material fatigue similar to plastic materials, that is to say, no matter how it is bent, ultra-thin Glass doesn't have a problem with creases.
  • the first cover There is also a second cover layer 102 on the plate layer 101, which can solve the problem that the ultra-thin glass is easily shattered by a strong impact and generates debris splashing.
  • the first cover layer 101 in this embodiment is made of ultra-thin glass material. Not only has good optical performance, high surface hardness, and excellent resilience performance, but also there is no need to worry about the safety of debris splashing due to strong impact.
  • a plurality of protrusions 103 are formed by patterning the first surface S1 of the first cover layer 101, and then the first surface S1 of the first cover layer 101 is prepared.
  • the second cover layer 102 completely covers the protrusions 103 .
  • the material of the second cover layer 102 is a material with a high refractive index, and the refractive index of the second cover layer 102 is greater than 1.5.
  • the preparation method of the cover plate 10 includes the following steps: first, the raw material of the first cover plate layer 101 (with a thickness between 100 microns and 500 microns) is thinned, and after thinning The thickness is generally between 30 microns and 70 microns; then, the first surface S1 of the first cover layer 101 is patterned by yellow light or laser technology to form a plurality of protrusions 103, and the cross-section of the protrusions 103 The width is between 10 micrometers and 30 micrometers; then a strengthening process is performed to enhance the surface strength and bendability of the first cover layer 101; finally, a high refractive index material (second The preparation of the second cover layer 102) means that the cover 10 is produced.
  • the cover plate 10 is module-bonded, the side opposite to the protrusion 103 of the first cover layer 101 (ie, the side opposite to the first surface S1 ) is bonded to the light-emitting side of the OLED display panel.
  • the plurality of protrusions 103 formed on the first surface S1 of the first cover layer 101 can play a role of concentrating light.
  • the protruding direction of the protrusion 103 faces the light emitting side of the cover plate 10, and the light emitted from the organic light-emitting layer of the OLED display panel is emitted from the first cover plate layer 101 to the second cover plate layer 102,
  • the plurality of protrusions 103 is equivalent to a microlens array, which can play the effect of converging light, improving the light extraction efficiency of the cover plate 10, that is, improving the performance of the display device. Light efficiency.
  • the light emitted from the organic light-emitting layer of the OLED display panel will first pass through the first cover layer 101, and then pass through the second cover layer 102, because the material of the second cover layer 102 is highly refractive
  • the high-efficiency material has a better scattering effect, can effectively reduce the side light output of the display device, and can further improve the light output efficiency of the display device.
  • the high refractive index material includes titanium dioxide (TiO 2 ), tantalum pentoxide (Ta 2 O 5 ), and hafnium oxide (HfO 2 ).
  • the material of the second cover layer 102 is ultra-thin glass or transparent polyimide.
  • ultra-thin glass has good optical properties, high surface hardness, and excellent resilience performance. There is no such thing as material fatigue similar to plastic materials. That is to say, no matter how you bend it, ultra-thin glass will not break problem of marks.
  • the impact resistance of ultra-thin glass is poor, and strong impact can easily cause ultra-thin glass to break. Not only damage and cost must be considered, but also safety issues such as preventing glass debris from splashing must be considered. Therefore, ultra-thin glass cannot be used as a cover.
  • the outer surface of the board 10 is used.
  • the second cover layer 102 is made of transparent polyimide
  • the imine material not only has good bending performance, but also does not crack.
  • the side where the second cover layer 102 is attached to the first cover layer 101 is patterned to form a one-to-one correspondence with a plurality of protrusions 103 (referring to shape, a plurality of grooves with exactly the same size and location), and then prepare a first cover layer 101 on the side where the second cover layer 102 is provided with a plurality of grooves, and the first cover layer 101 completely covers the plurality of grooves.
  • a plurality of protrusions 103 are formed on the side of the first cover layer 101 in contact with the plurality of grooves (that is, the first surface S1).
  • the refractive index of the second cover layer 102 is equal to 1.5
  • the material of the first cover layer 101 is a material with a low refractive index
  • the refractive index of the first cover layer 101 is less than 1.5.
  • the preparation method of the cover plate 10 includes the following steps: first, the raw material of the second cover plate layer 102 (thickness is between 100 microns and 500 microns) is thinned, and after thinning The thickness is generally between 30 microns and 70 microns; then, the surface of the side of the second cover layer 102 that is bonded to the first cover layer 101 is patterned by yellow light or laser technology to form a plurality of bumps.
  • the cover plate 10 is module-bonded, the side of the first cover plate layer 101 away from the second cover plate layer 102 is bonded to the light emitting side of the OLED display panel.
  • grooves are formed on the surface of the second cover layer 102, and in order to play a light-gathering effect, it is necessary to direct the concave direction of the grooves toward the light-emitting side of the OLED display panel, that is, the The side of the second cover layer 102 with grooves is disposed close to the light-emitting side of the OLED display panel, so that when the light emitted from the organic light-emitting layer of the OLED display panel passes through the plurality of grooves, the plurality of grooves are equivalent to
  • the microlens array can have the effect of converging light, which improves the light extraction efficiency of the cover plate 10, that is, improves the light extraction efficiency of the display device.
  • the light emitted from the organic light-emitting layer of the OLED display panel will first pass through the first cover layer 101, and then pass through the second cover layer 102, because the material of the first cover layer 101 is low refraction High-efficiency materials will not affect the propagation direction of the light emitted by the organic light-emitting layer.
  • the low refractive index material includes aluminum oxide (Al 2 O 3 ), silicon dioxide (SiO 2 ).
  • FIG. 2 is a schematic diagram of the basic structure of another cover plate provided by the embodiment of the present application.
  • the cover plate 10 includes a first cover plate layer 101 and a second cover plate layer 102.
  • the first cover plate layer 101 is located on the light incident side of the cover plate 10;
  • the second cover plate layer 102 is located on the light emitting side of the cover plate 10, and is attached to the first surface S1 of the first cover plate layer 101;
  • the The first surface S1 of the first cover layer 101 is provided with a plurality of protrusions 103 , and the refractive index of the first cover layer 101 is lower than that of the second cover layer 102 .
  • the cross-sectional width of the protrusion 103 is greater than or equal to 10 microns and less than or equal to 30 microns
  • the cover plate 10 includes a bending area A1 and a non-bending area A2, and the protrusion located in the bending area A1
  • the section width of the protrusion 103 is larger than the section width of the protrusion 103 located in the non-bending area A2.
  • the cover plate 10 when the cover plate 10 is bent, the inner side of the first cover plate layer 101 in the bending area A1 will be squeezed, and the outer side will be stretched, that is, the protrusion 103 in the bending area A1 will be stretched,
  • the protrusion 103 in the bending area A1 by setting the cross-sectional width of the protrusion 103 in the bending area A1 to be larger than the cross-sectional width of the protrusion 103 in the non-bending area A2, during the bending process, the protrusion 103 in the bending area A1 can be larger Part of the tensile stress is transmitted to the upper second cover layer 102.
  • the cover plate 10 will not deform too much due to excessive bending force, resulting in bending and fracture.
  • the The cross-sectional width of the protrusion 103 gradually decreases from the bending area A1 to the non-bending area A2, which can further balance the bending stress when the cover plate 10 is bent, and avoid bending fracture.
  • FIG. 3 is a schematic diagram of the basic structure of a display device provided by an embodiment of the present application.
  • the display device 100 includes a flexible display panel 20 and a cover plate 10 disposed on the flexible display panel 20 .
  • the cover plate 10 Please refer to FIG. 1 , FIG. 2 and related descriptions for the structure and preparation method, and details will not be repeated here.
  • the flexible display panel 20 may be an OLED display panel.
  • the flexible display panel 20 includes a flexible substrate 201, a driving circuit layer 202 disposed on the flexible substrate 201, a light emitting function layer 203 disposed on the driving circuit layer 202, and a light emitting function layer disposed on the flexible substrate 201.
  • the second cover layer 102 is connected to the first surface S1 of the first cover layer 101. and the refractive index of the first cover layer 101 is lower than that of the second cover layer 102, so that the light emitted by the organic light-emitting layer of the flexible display panel 20 is transmitted by the low-refractive index film layer (that is, the second cover layer 102).
  • a cover layer 101 optical thinning medium shoots to the high-refractive index film layer (i.e.
  • the second cover layer 102 optically dense medium
  • a plurality of protrusions 103 are arranged to form microlenses
  • the array gathers light on the light emitting side of the cover plate 10 to increase the light emitting efficiency of the entire display device 100 .
  • the display device 100 provided in the embodiment of the present application may be a product or component having a display function such as a mobile phone, a tablet computer, a notebook computer, a digital camera, and a navigator.
  • the embodiment of the present application provides a cover plate, which includes a first cover plate layer and a second cover plate layer, the first cover plate layer is located on the light-incident side of the cover plate; the second cover plate layer The cover layer is located on the light-emitting side of the cover, and is attached to the first surface of the first cover layer; wherein, the first surface of the first cover layer is provided with a plurality of protrusions, and the The refractive index of the first cover layer is lower than the refractive index of the second cover layer.
  • a plurality of protrusions are provided on the first surface of the first cover layer to attach the second cover layer to the first surface of the first cover layer, and the refraction of the first cover layer
  • the refractive index is lower than the refractive index of the second cover layer, so that the light emitted by the organic light-emitting layer of the OLED display panel is directed from the low-refractive-index film layer to the high-refractive-index film layer, reducing the light loss caused by total reflection.
  • a plurality of protrusions form a microlens array, which converges the light on the light-emitting side of the cover plate, increases the light-emitting efficiency of the entire display device, and solves the problem that the cover plate in the prior art uses glass, and the refractive index of glass is lower than that of organic glass.
  • the refractive index of the light-emitting layer due to the principle of total reflection, most of the light emitted by the organic light-emitting layer returns to the organic light-emitting layer, resulting in the technical problem of low light extraction efficiency of the display device.

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Abstract

一种盖板（10）及显示装置。所述盖板（10）包括第一盖板层（101）和第二盖板层（102），第一盖板层（101）位于盖板（10）的入光侧；第二盖板层（102）位于盖板（10）的出光侧，且贴合于第一盖板层（101）的第一表面；其中，第一盖板层（101）的第一表面设有多个凸起，且第一盖板层（101）的折射率低于第二盖板层（102）的折射率。

Description

一种盖板及显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种盖板及显示装置。
 背景技术
随着显示技术的发展，对色彩和轻便度要求越来越高，OLED(Organic Light Emitting Diode，有机发光二极管)显示面板由于具有发光效率高、视角广、响应速度快、超薄、质量轻、可制作在柔性衬底上等特点，正在逐渐走进移动设备、电视机等消费电子市场。
在现有技术中，一般选择透明玻璃作为OLED显示面板的盖板，而玻璃的折射率一般为1.4~1.5，OLED显示面板的有机发光层的折射率一般为1.7~1.8。因此有机发光层通电发出的光线，经过玻璃进入空气时，由于全反射原理，会有大部分的光线返回有机发光层中，导致整个显示装置的出光效率大大降低。因此，如何提高显示装置的出光效率成为技术人员的研发热点。
 技术问题
本申请提供一种盖板，用于解决现有技术的盖板采用玻璃，而玻璃的折射率低于有机发光层的折射率，由于全反射原理，有机发光层发出的光线大部分返回有机发光层中，导致显示装置的出光效率低的技术问题。
 技术解决方案
本申请实施例提供一种盖板，包括第一盖板层和第二盖板层，所述第一盖板层位于所述盖板的入光侧；所述第二盖板层位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。
在本申请实施例提供的盖板中，所述凸起的截面宽度大于或等于10微米且小于或等于30微米。
在本申请实施例提供的盖板中，所述盖板包括弯折区和非弯折区，位于所述弯折区的所述凸起的截面宽度大于位于所述非弯折区的所述凸起的截面宽度。
在本申请实施例提供的盖板中，所述凸起的截面宽度由所述弯折区向所述非弯折区逐渐递减。
在本申请实施例提供的盖板中，所述第一盖板层或所述第二盖板层的厚度大于或等于30微米且小于或等于70微米。
在本申请实施例提供的盖板中，所述凸起的高度大于或等于所述第二盖板层的厚度的三分之一且小于或等于所述第二盖板层的厚度的三分之二。
在本申请实施例提供的盖板中，所述凸起的截面形状为半圆形、半椭圆形、三角形或矩形。
在本申请实施例提供的盖板中，所述第一盖板层的材料为超薄玻璃，所述第二盖板层的材料为二氧化钛、五氧化二钽、氧化铪之中的任一种。
在本申请实施例提供的盖板中，所述第二盖板层的材料为透明聚酰亚胺，所述第一盖板层的材料为氧化铝或二氧化硅。
在本申请实施例提供的盖板中，所述第二盖板层的折射率大于或等于1.5。
本申请实施例还提供一种显示装置，包括柔性显示面板以及设于所述柔性显示面板之上的盖板，所述盖板包括第一盖板层和第二盖板层，所述第一盖板层位于所述盖板的入光侧；所述第二盖板层位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。
在本申请实施例提供的显示装置中，所述凸起的截面宽度大于或等于10微米且小于或等于30微米。
在本申请实施例提供的显示装置中，所述盖板包括弯折区和非弯折区，位于所述弯折区的所述凸起的截面宽度大于位于所述非弯折区的所述凸起的截面宽度。
在本申请实施例提供的显示装置中，所述凸起的截面宽度由所述弯折区向所述非弯折区逐渐递减。
在本申请实施例提供的显示装置中，所述第一盖板层或所述第二盖板层的厚度大于或等于30微米且小于或等于70微米。
在本申请实施例提供的显示装置中，所述凸起的高度大于或等于所述第二盖板层的厚度的三分之一且小于或等于所述第二盖板层的厚度的三分之二。
在本申请实施例提供的显示装置中，所述凸起的截面形状为半圆形、半椭圆形、三角形或矩形。
在本申请实施例提供的显示装置中，所述第一盖板层的材料为超薄玻璃，所述第二盖板层的材料为二氧化钛、五氧化二钽、氧化铪之中的任一种。
在本申请实施例提供的显示装置中，所述第二盖板层的材料为透明聚酰亚胺，所述第一盖板层的材料为氧化铝或二氧化硅。
在本申请实施例提供的显示装置中，所述第二盖板层的折射率大于或等于1.5。
 有益效果
本申请提供的一种盖板，包括第一盖板层和第二盖板层，所述第一盖板层位于所述盖板的入光侧；所述第二盖板层位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。本申请通过在第一盖板层的第一表面设置多个凸起，将第二盖板层与所述第一盖板层的第一表面贴合，且所述第一盖板层的折射率低于所述第二盖板层的折射率，使得OLED显示面板的有机发光层发出的光线由低折射率膜层射向高折射率膜层，减少了全反射导致的光线损耗，设置的多个凸起形成微透镜阵列，将光线在所述盖板的出光侧进行汇聚，增加了整个显示装置的出光效率。
 附图说明
图1为本申请实施例提供的盖板的基本结构示意图。
图2为本申请实施例提供的另一盖板的基本结构示意图。
图3为本申请实施例提供的显示装置的基本结构示意图。
 本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。在附图中，为了清晰及便于理解和描述，附图中绘示的组件的尺寸和厚度并未按照比例。
请参阅图1，为本申请实施例提供的盖板的基本结构示意图，所述盖板10包括第一盖板层101和第二盖板层102，所述第一盖板层101位于所述盖板10的入光侧；所述第二盖板层102位于所述盖板10的出光侧，且贴合于所述第一盖板层101的第一表面S1；其中，所述第一盖板层101的第一表面S1设有多个凸起103，且所述第一盖板层101的折射率低于所述第二盖板层102的折射率。
需要说明的是，所述盖板10的入光侧指的是放置OLED显示面板(未图示)的一侧，所述盖板10的出光侧指的是远离OLED显示面板的一侧。所述第二盖板层102贴合于所述第一盖板层101的第一表面S1指的是所述第二盖板层102完全覆盖所述第一盖板层101的第一表面S1的多个凸起103。
可以理解的是，本申请通过在第一盖板层101的第一表面S1设置多个凸起103，将第二盖板层102与所述第一盖板层101的第一表面S1贴合，且所述第一盖板层101的折射率低于所述第二盖板层102的折射率，使得OLED显示面板的有机发光层发出的光线由低折射率膜层(即第一盖板层101，光疏介质)射向高折射率膜层(即第二盖板层102，光密介质)，减少了全反射导致的光线损耗，设置的多个凸起103形成微透镜阵列，将光线在所述盖板10的出光侧进行汇聚，增加了整个显示装置的出光效率。
在一种实施例中，所述凸起103的截面宽度大于或等于10微米且小于或等于30微米，所述凸起103的截面形状为半圆形、半椭圆形、三角形或矩形。所述第一盖板层101或所述第二盖板层102的厚度大于或等于30微米且小于或等于70微米，所述凸起103的高度大于或等于所述第二盖板层102的厚度的三分之一且小于或等于所述第二盖板层102的厚度的三分之二。
在一种实施例中，所述第一盖板层101的材料为超薄玻璃或透明聚酰亚胺。具体的，透明聚酰亚胺具有良好的弯折性能，但光学性能一般，且需要加镀一层硬膜来有限地提升表面硬度，这意味着反复折叠容易产生折痕，且耐刮性能一般，若接触硬物顶压或刮擦，很容易造成盖板表面划痕甚至出现坏点。相比透明聚酰亚胺，超薄玻璃具有较好的光学性能，表面硬度高，回弹性能极优秀，没有塑胶材质类似的材料疲劳度的说法，也就是说，无论怎么弯折，超薄玻璃不会有折痕的问题。但超薄玻璃的耐冲击性能差，强烈冲击很容易导致超薄玻璃的碎裂，不仅要考虑损坏和成本，更要考虑防玻璃碎屑飞溅这样的安全问题，本实施例中，第一盖板层101之上还设置有第二盖板层102，可解决超薄玻璃受到强烈冲击容易碎裂产生碎屑飞溅的问题，本实施例中的第一盖板层101采用超薄玻璃材料，不仅具有较好的光学性能，表面硬度高，回弹性能极优秀，还不用担心受到强烈冲击产生碎屑飞溅的安全问题。
需要说明的是，本实施例是通过对第一盖板层101的第一表面S1进行图案化处理，形成多个凸起103，然后在所述第一盖板层101的第一表面S1制备第二盖板层102，所述第二盖板层102完全覆盖所述多个凸起103。在本实施例中，所述第二盖板层102的材料为高折射率材料，所述第二盖板层102的折射率大于1.5。
具体的，在本实施例中，所述盖板10的制备方法包括步骤：首先将第一盖板层101的原材(厚度为100微米~500微米之间)进行减薄处理，减薄后的厚度一般是30微米~70微米之间；然后通过黄光或激光工艺在第一盖板层101的第一表面S1进行图案化处理，形成多个凸起103，所述凸起103的截面宽度为10微米~30微米之间；然后进行强化工艺，增强第一盖板层101的表面强度和弯折性；最后在第一盖板层101的第一表面S1进行高折射率材料(第二盖板层102)的制备，即制得所述盖板10。所述盖板10进行模组贴合时，将所述第一盖板层101设置凸起103的相反侧(即与第一表面S1相对的一面)与OLED显示面板的出光侧相贴合。
可以理解的是，所述第一盖板层101的第一表面S1形成的多个凸起103能起到聚光作用。具体的，所述凸起103的凸起方向朝向所述盖板10的出光侧，从OLED显示面板的有机发光层发出的光线是由第一盖板层101射向第二盖板层102，当光线经过所述多个凸起103时，所述多个凸起103相当于微透镜阵列，可以起到汇聚光线的效果，提高了所述盖板10的出光效率，即提高了显示装置的出光效率。
另外，从OLED显示面板的有机发光层发出的光线会先经过所述第一盖板层101，再经过所述第二盖板层102，由于所述第二盖板层102的材料为高折射率材料，有比较好的散射效果，可以有效减少显示装置的侧面出光，可以进一步提高显示装置的出光效率。
在一种实施例中，所述高折射率材料包括二氧化钛(TiO 2)、五氧化二钽(Ta 2O 5)、氧化铪(HfO 2)。
在一种实施例中，所述第二盖板层102的材料为超薄玻璃或透明聚酰亚胺。具体的，超薄玻璃具有较好的光学性能，表面硬度高，回弹性能极优秀，没有塑胶材质类似的材料疲劳度的说法，也就是说，无论怎么弯折，超薄玻璃不会有折痕的问题。但超薄玻璃的耐冲击性能差，强烈冲击很容易导致超薄玻璃的碎裂，不仅要考虑损坏和成本，更要考虑防玻璃碎屑飞溅这样的安全问题，因此，超薄玻璃无法作为盖板10的外表面使用。相比超薄玻璃，透明聚酰亚胺不存在碎裂的问题，透明聚酰亚胺具有良好的弯折性能，因此，在本实施例中，所述第二盖板层102采用透明聚酰亚胺材料，不仅具有良好的弯折性能，还不会发生碎裂。
需要说明的是，本实施例是通过将第二盖板层102与第一盖板层101贴合的一侧进行图案化处理，形成与多个凸起103一一对应(指的是形状、大小、设置位置完全相同)的多个凹槽，然后在第二盖板层102设置多个凹槽的一侧制备第一盖板层101，所述第一盖板层101完全覆盖所述多个凹槽，相应的，所述第一盖板层101与所述多个凹槽接触的一侧(即第一表面S1)形成多个凸起103。在本实施例中，所述第二盖板层102的折射率等于1.5，所述第一盖板层101的材料为低折射率材料，所述第一盖板层101的折射率小于1.5。
具体的，在本实施例中，所述盖板10的制备方法包括步骤：首先将第二盖板层102的原材(厚度为100微米~500微米之间)进行减薄处理，减薄后的厚度一般是30微米~70微米之间；然后通过黄光或激光工艺在第二盖板层102将与第一盖板层101贴合的一侧表面进行图案化处理，形成与多个凸起103一一对应的多个凹槽，所述凹槽的截面宽度为10微米~30微米之间；然后进行强化工艺，增强第二盖板层102的表面强度和弯折性；最后在第二盖板层102设置凹槽的一侧表面进行低折射率材料(第一盖板层101)的制备，即制得所述盖板10。所述盖板10进行模组贴合时，将所述第一盖板层101远离所述第二盖板层102的一侧与OLED显示面板的出光侧相贴合。
可以理解的是，所述第二盖板层102的表面形成的是凹槽，为了起到聚光作用，需要将所述凹槽的凹陷方向朝向OLED显示面板的出光侧，即需要将所述第二盖板层102具有凹槽的一侧靠近OLED显示面板的出光侧设置，如此，从OLED显示面板的有机发光层发出的光线经过所述多个凹槽时，所述多个凹槽相当于微透镜阵列，可以起到汇聚光线的效果，提高了所述盖板10的出光效率，即提高了显示装置的出光效率。
另外，从OLED显示面板的有机发光层发出的光线会先经过所述第一盖板层101，再经过所述第二盖板层102，由于所述第一盖板层101的材料为低折射率材料，不会对有机发光层发出的光线的传播方向造成影响。
在一种实施例中，所述低折射率材料包括氧化铝(Al 2O 3)、二氧化硅(SiO 2)。
接下来请参阅图2，为本申请实施例提供的另一盖板的基本结构示意图，所述盖板10包括第一盖板层101和第二盖板层102，所述第一盖板层101位于所述盖板10的入光侧；所述第二盖板层102位于所述盖板10的出光侧，且贴合于所述第一盖板层101的第一表面S1；所述第一盖板层101的第一表面S1设有多个凸起103，且所述第一盖板层101的折射率低于所述第二盖板层102的折射率。其中，所述凸起103的截面宽度大于或等于10微米且小于或等于30微米，所述盖板10包括弯折区A1和非弯折区A2，位于所述弯折区A1的所述凸起103的截面宽度大于位于所述非弯折区A2的所述凸起103的截面宽度。
可以理解的是，当弯折盖板10时，弯折区A1第一盖板层101的内侧会被挤压，外侧会被拉伸，即弯折区A1的凸起103会被拉伸，本申请通过将弯折区A1的凸起103的截面宽度设置为大于非弯折区A2的凸起103的截面宽度，使得在弯折过程中，位于弯折区A1的凸起103可以将大部分拉伸应力传递给上方的第二盖板层102，在弯折过程中，不会由于弯折力度过大导致盖板10的形变过大，导致弯折断裂的情况出现，具体的，所述凸起103的截面宽度由所述弯折区A1向所述非弯折区A2逐渐递减，可进一步平衡盖板10弯折时的弯折应力，避免出现弯折断裂的情况。
请参阅图3，为本申请实施例提供的显示装置的基本结构示意图，所述显示装置100包括柔性显示面板20以及设于所述柔性显示面板20之上的盖板10，所述盖板10的结构及制备方法请参阅图1、图2及相关描述，此处不再赘述，所述柔性显示面板20可以为OLED显示面板。具体的，所述柔性显示面板20包括柔性衬底201、设于所述柔性衬底201之上的驱动电路层202、设于所述驱动电路层202之上的发光功能层203以及设于所述发光功能层203之上的薄膜封装层204，其中，所述盖板10设置在所述薄膜封装层204远离所述发光功能层203的一侧，所述发光功能层203包括有机发光层(未图示)。
可以理解的是，本申请实施例通过在第一盖板层101的第一表面S1设置多个凸起103，将第二盖板层102与所述第一盖板层101的第一表面S1贴合，且所述第一盖板层101的折射率低于所述第二盖板层102的折射率，使得柔性显示面板20的有机发光层发出的光线由低折射率膜层(即第一盖板层101，光疏介质)射向高折射率膜层(即第二盖板层102，光密介质)，减少了全反射导致的光线损耗，设置的多个凸起103形成微透镜阵列，将光线在所述盖板10的出光侧进行汇聚，增加了整个显示装置100的出光效率。
本申请实施例提供的显示装置100可以为：手机、平板电脑、笔记本电脑、数码相机、导航仪等具有显示功能的产品或部件。
综上所述，本申请实施例提供的一种盖板，包括第一盖板层和第二盖板层，所述第一盖板层位于所述盖板的入光侧；所述第二盖板层位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。本申请通过在第一盖板层的第一表面设置多个凸起，将第二盖板层与所述第一盖板层的第一表面贴合，且所述第一盖板层的折射率低于所述第二盖板层的折射率，使得OLED显示面板的有机发光层发出的光线由低折射率膜层射向高折射率膜层，减少了全反射导致的光线损耗，设置的多个凸起形成微透镜阵列，将光线在所述盖板的出光侧进行汇聚，增加了整个显示装置的出光效率，解决了现有技术的盖板采用玻璃，而玻璃的折射率低于有机发光层的折射率，由于全反射原理，有机发光层发出的光线大部分返回有机发光层中，导致显示装置的出光效率低的技术问题。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些替换或改变都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种盖板，其包括：
    第一盖板层，位于所述盖板的入光侧；
    第二盖板层，位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；
    其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。
  2. 如权利要求1所述的盖板，其中，所述凸起的截面宽度大于或等于10微米且小于或等于30微米。
  3. 如权利要求2所述的盖板，其中，所述盖板包括弯折区和非弯折区，位于所述弯折区的所述凸起的截面宽度大于位于所述非弯折区的所述凸起的截面宽度。
  4. 如权利要求3所述的盖板，其中，所述凸起的截面宽度由所述弯折区向所述非弯折区逐渐递减。
  5. 如权利要求1所述的盖板，其中，所述第一盖板层或所述第二盖板层的厚度大于或等于30微米且小于或等于70微米。
  6. 如权利要求5所述的盖板，其中，所述凸起的高度大于或等于所述第二盖板层的厚度的三分之一且小于或等于所述第二盖板层的厚度的三分之二。
  7. 如权利要求1所述的盖板，其中，所述凸起的截面形状为半圆形、半椭圆形、三角形或矩形。
  8. 如权利要求1所述的盖板，其中，所述第一盖板层的材料为超薄玻璃，所述第二盖板层的材料为二氧化钛、五氧化二钽、氧化铪之中的任一种。
  9. 如权利要求1所述的盖板，其中，所述第二盖板层的材料为透明聚酰亚胺，所述第一盖板层的材料为氧化铝或二氧化硅。
  10. 如权利要求1所述的盖板，其中，所述第二盖板层的折射率大于或等于1.5。
  11. 一种显示装置，其包括柔性显示面板以及设于所述柔性显示面板之上的盖板，所述盖板包括：
    第一盖板层，位于所述盖板的入光侧；
    第二盖板层，位于所述盖板的出光侧，且贴合于所述第一盖板层的第一表面；
    其中，所述第一盖板层的第一表面设有多个凸起，且所述第一盖板层的折射率低于所述第二盖板层的折射率。
  12. 如权利要求11所述的显示装置，其中，所述凸起的截面宽度大于或等于10微米且小于或等于30微米。
  13. 如权利要求12所述的显示装置，其中，所述盖板包括弯折区和非弯折区，位于所述弯折区的所述凸起的截面宽度大于位于所述非弯折区的所述凸起的截面宽度。
  14. 如权利要求13所述的显示装置，其中，所述凸起的截面宽度由所述弯折区向所述非弯折区逐渐递减。
  15. 如权利要求11所述的显示装置，其中，所述第一盖板层或所述第二盖板层的厚度大于或等于30微米且小于或等于70微米。
  16. 如权利要求15所述的显示装置，其中，所述凸起的高度大于或等于所述第二盖板层的厚度的三分之一且小于或等于所述第二盖板层的厚度的三分之二。
  17. 如权利要求11所述的显示装置，其中，所述凸起的截面形状为半圆形、半椭圆形、三角形或矩形。
  18. 如权利要求11所述的显示装置，其中，所述第一盖板层的材料为超薄玻璃，所述第二盖板层的材料为二氧化钛、五氧化二钽、氧化铪之中的任一种。
  19. 如权利要求11所述的显示装置，其中，所述第二盖板层的材料为透明聚酰亚胺，所述第一盖板层的材料为氧化铝或二氧化硅。
  20. 如权利要求11所述的显示装置，其中，所述第二盖板层的折射率大于或等于1.5。
PCT/CN2021/099126 2021-06-03 2021-06-09 一种盖板及显示装置 WO2022252269A1 (zh)

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