CN217112786U

Movatterモバイル変換

Info

Publication number: CN217112786U
Application number: CN202220997225.9U
Authority: CN
Inventors: 刘刚; 杨伟恒; 王维
Original assignee: TCL China Star Optoelectronics Technology Co Ltd
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-08-02
Anticipated expiration: 2032-04-26

Abstract

Description

Polaroid and display device

Technical Field

The application relates to the technical field of display, in particular to a polarizer and a display device.

Background

In the liquid crystal display, the optical characteristics of the polarizers attached to both sides of the liquid crystal cell have a great influence on the display effect. In order to improve the contrast ratio and viewing angle performance of the display, an optical compensation layer is often added to the polarizer. The effect is that phase compensation is carried out to oblique incidence's light when black state, makes it close the linear polarization state to make the black that each angle shows purer, promote the display effect.

To meet optical performance requirements, cellulose triacetate materials are commonly used to make optical compensation layers. The advantage of using such a material is good optical properties. At the same time, however, there are some disadvantages in the physical properties of this material. When the optical compensation layer is attached to the display panel through the optical cement, the optical compensation layer has different coefficients of thermal expansion and cold contraction with respect to the optical cement, or is subjected to tensile stress during the process, so that the optical compensation layer has cracks at the stretched or cut position of the edge of the optical compensation layer due to stress concentration.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a polarizer and a display device, and aims to reduce cracks generated at the edge of the polarizer.

In one aspect, the present application provides a polarizer, the polarizer at least comprising:

the optical adhesive layer is provided with a first peripheral side;

the optical compensation layer is positioned on the optical adhesive layer and provided with a second peripheral side;

a polarizing base layer on the optical compensation layer;

wherein, the orthographic projection of the optical adhesive layer on the polarized light base layer is positioned in the range of the orthographic projection of the optical compensation layer on the polarized light base layer, and the first peripheral side and the second peripheral side are staggered.

In some embodiments, the polarizer further comprises a fill layer located on the first peripheral side of the optical adhesive layer.

In some embodiments, the difference in stress between the fill layer and the optical compensation layer is within a preset threshold.

In some embodiments, the optical compensation layer is also located on the first peripheral side of the optical glue layer.

In some embodiments, the optical compensation layer has a first region overlapping the optical glue layer and a second region located around the first region, the optical compensation layer having a thickness in the second region greater than a thickness in the first region.

In some embodiments, the optical compensation layer further comprises a display region in the middle and a non-display region around the display region.

In some embodiments, an orthographic projection of the optical compensation layer of the display area on the polarizing base layer is within a range of an orthographic projection of the optical adhesive layer on the polarizing base layer.

In some embodiments, the distance between the first and second peripheral sides on a plane parallel to the polarizing base layer is less than 2 mm.

In some embodiments, the polarizer further comprises:

a first protective layer positioned between the optical compensation layer and the polarization base layer;

and the second protective layer is positioned on the polarized light base layer.

In another aspect, the present application provides a display device, including at least:

a polarizer provided in any of the above embodiments;

and the display panel is connected with the polaroid through the optical adhesive layer.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a polarizer according to a first embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a display device according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a polarizer according to a second embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a polarizer according to a first embodiment of the present disclosure. The polarizer may be applied to various displays, such as a liquid crystal display. Thepolarizer 100 at least includes an opticaladhesive layer 10, anoptical compensation layer 11 on the opticaladhesive layer 10, and a polarizingbase layer 12 on theoptical compensation layer 11. Theoptical glue layer 10 has a firstperipheral side 101 and theoptical compensation layer 11 has a second peripheral side 111. The "first peripheral side" refers to a peripheral side surface of the opticaladhesive layer 10, and when the shape of the opticaladhesive layer 10 is a rectangular parallelepiped, the "first peripheral side" refers to a peripheral side surface of the rectangular parallelepiped. Similarly, the "second peripheral side" refers to a peripheral side surface of theoptical compensation layer 11. Here, the "first peripheral side" may also refer to the edge of the opticaladhesive layer 10, and the "second peripheral side" may also refer to the edge of theoptical compensation layer 11.

The opticalAdhesive layer 10 may be Pressure Sensitive Adhesive (PSA), theoptical compensation layer 11 may be cellulose triacetate (tac) or Cyclic Olefin Polymer (COP), and the material of thepolarization substrate layer 12 may be Polyvinyl alcohol (PVA).

In some embodiments, the distance L between the firstperipheral side 101 of the opticaladhesive layer 10 and the second peripheral side 111 of theoptical compensation layer 11 in a plane parallel to thepolarization base layer 12 is less than 2mm, for example, the distance L between the firstperipheral side 101 and the second peripheral side 111 in a plane parallel to thepolarization base layer 12 is 1 mm.

In some embodiments, theoptical compensation layer 11 includes a display region D1 in the middle and a non-display region D2 around the display region D1. The display region D1 is used to implement an image display function, and the non-display region D2 may be a bezel region of the display. Wherein, the orthographic projection of theoptical compensation layer 11 of the display region D1 on thepolarization base layer 12 is within the range of the orthographic projection of the opticaladhesive layer 10 on thepolarization base layer 12. That is, the area of the upper surface (or the lower surface) of theoptical compensation layer 11 in the display region D1 is smaller than the area of the upper surface (or the lower surface) of the opticaladhesive layer 10, or the opticaladhesive layer 10 includes the display region D1, so that the display region D1 is prevented from being affected by the reduction of the coverage area of the opticaladhesive layer 10.

Compared with the related art, in thepolarizer 100 of the present embodiment, the opticaladhesive layer 10 does not cover the edge of theoptical compensation layer 11, and the edge of theoptical compensation layer 11 is prevented from aligning with the edge of the opticaladhesive layer 10, so that the generation of cracks at the edge is effectively avoided, and the display effect is prevented from being affected. In addition, no new edge is introduced in the method, so that cracks caused by stress difference or expansion with heat and contraction with cold can be effectively avoided, secondary cracks can not be generated in long-term use, and the method has high reliability.

In some embodiments, thepolarizer 100 may further include afilling layer 13 located on the firstperipheral side 101 of the opticaladhesive layer 10, wherein thefilling layer 13 is located on the lower surface of theoptical compensation layer 11 not covered by the opticaladhesive layer 10 to fill the portion of the opticaladhesive layer 10 shrinking inwards. The fillinglayer 13 has excellent filling performance and adhesion performance, and is attached to other structures together with the opticaladhesive layer 10.

The stress difference between the fillinglayer 13 and theoptical compensation layer 11 is within a preset threshold, and the preset threshold may be adjusted according to a process requirement, for example, the preset threshold may be 10 Mpa. That is, the difference in stress between the fillinglayer 13 and theoptical compensation layer 11 is small, and cracks can be effectively prevented from being generated at the edges.

In some embodiments, thepolarizer 100 may further include a firstprotective layer 14 and a secondprotective layer 15, the firstprotective layer 14 is located between theoptical compensation layer 11 and thepolarizing base layer 12, and the secondprotective layer 15 is located on thepolarizing base layer 12. Thefirst protection layer 14 may be acrylic, i.e., polymethyl methacrylate (PMMA), and thesecond protection layer 15 may be Triacetyl Cellulose (TAC). The firstprotective layer 14 and the secondprotective layer 15 have high mechanical strength, and can achieve the effect of protecting thepolarizing base layer 12.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application. For the sake of understanding and brief explanation, the same reference numerals are used for the same structures in the present embodiment as those in the above-described embodiment. Thedisplay device 200 includes thepolarizer 100 of any of the above embodiments, and thedisplay panel 20 connected to thepolarizer 100 through the opticaladhesive layer 10. Thedisplay panel 20 may be a liquid crystal display panel, and the liquid crystal display panel may include an array substrate and a color film substrate that are arranged oppositely, and a liquid crystal layer located between the array substrate and the color film substrate.

In some embodiments, as shown in FIG. 2,polarizer 100 is positioned abovedisplay panel 20. In other embodiments, thepolarizer 100 may be located below thedisplay panel 20.

Due to the fact that the coverage area of the opticaladhesive layer 10 is reduced, a certain hollow-out exists between theoptical compensation layer 11 and thedisplay panel 20. Thepolarizer 100 has the physical property of being flexible and deformable, and is easily peeled from thedisplay panel 20 by an external force at the edge, which affects the firmness of the adhesion between thepolarizer 100 and thedisplay panel 20. Therefore, thepolarizer 100 further includes afilling layer 13 disposed on thefirst periphery 101 of the opticaladhesive layer 10, and thefilling layer 13 is disposed on the lower surface of theoptical compensation layer 11 not covered by the opticaladhesive layer 10 to perform filling and adhesion functions. In some embodiments, the material of thefilling layer 13 may be a side coating, which has excellent filling performance and adhesion and can fill gaps well.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a display device according to another embodiment of the present application. For the sake of understanding and brief explanation, the same reference numerals are used for the same structures in the present embodiment as those in the above-described embodiment. Thedisplay device 200 may include twopolarizers 100 and adisplay panel 20 positioned between the twopolarizers 100. The opticaladhesive layer 10 of eachpolarizer 100 is connected to thedisplay panel 20, that is, the twopolarizers 100 are disposed in opposite directions. Theunderlying polarizer 100 includes an opticaladhesive layer 10, a firstprotective layer 14 underlying the opticaladhesive layer 10, apolarizing base layer 12 underlying the firstprotective layer 14, and a secondprotective layer 15 underlying thepolarizing base layer 12.

Thepolarizer 100 controls the backlight to pass only light in a specific direction, and filters light in other directions. The light processed by thepolarizer 100 may be twisted by the liquid crystal molecules to control the brightness of the light emitted from thedisplay device 200, thereby controlling the brightness of the picture.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a polarizer according to a second embodiment of the present application. Thepolarizer 300 at least includes an opticaladhesive layer 30, an optical compensation layer 31 on the opticaladhesive layer 30, and apolarizing base layer 32 on the optical compensation layer 31. Theoptical glue layer 30 has a firstperipheral side 301, and the optical compensation layer 31 has a second peripheral side 311. Thepolarizer 300 further includes a firstprotective layer 34 and a second protective layer 35, wherein the firstprotective layer 34 is located between the optical compensation layer 31 and thepolarizing base layer 32, and the second protective layer 35 is located on thepolarizing base layer 32.

In this embodiment, the optical compensation layer 31 is further located on thefirst periphery 301 of the opticaladhesive layer 30, and the shape of the optical compensation layer 31 is as shown in fig. 4. Specifically, the optical compensation layer 31 has a first area a1 overlapping with the opticaladhesive layer 30 and a second area a2 located around the first area a1, and the optical compensation layer 31 of the second area a2 is located around the opticaladhesive layer 10. The thickness of the optical compensation layer 31 in the second region a2 is greater than that in the first region a1, and "thickness" refers to a thickness in a direction perpendicular to thepolarizing base layer 32.

Wherein, the difference between the thicknesses of the optical compensation layer 31 in the second region a2 and the first region a1 may be equal to the thickness of theoptical glue layer 30. The optical compensation layer 31 of the first region a1 is mainly used to improve the contrast ratio and viewing angle performance of the display, and the optical compensation layer 31 of the second region a2 mainly plays a supporting role.

The above description of the embodiments is only for assisting understanding of the technical solutions and the core ideas thereof; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A polarizer, comprising:

the optical adhesive layer is provided with a first peripheral side;

a polarizing base layer on the optical compensation layer;

2. The polarizer of claim 1 further comprising a fill layer on the first peripheral side of the optical glue layer.

3. The polarizer of claim 2 wherein the difference in stress between the fill layer and the optical compensation layer is within a preset threshold.

4. The polarizer of claim 1, wherein the optical compensation layer is further located on the first peripheral side of the optical glue layer.

5. The polarizer according to claim 4, wherein the optical compensation layer has a first region overlapping with the optical adhesive layer and a second region located around the first region, and the thickness of the optical compensation layer is greater in the second region than in the first region.

6. The polarizer of claim 1, wherein the optical compensation layer further comprises a display region in the middle and a non-display region around the display region.

7. The polarizer according to claim 6, wherein an orthographic projection of the optical compensation layer of the display region on the polarizing base layer is within a range of an orthographic projection of the optical adhesive layer on the polarizing base layer.

8. The polarizer according to claim 1, wherein a distance between the first peripheral side and the second peripheral side in a plane parallel to the polarizing base layer is less than 2 mm.

9. The polarizer of claim 1, further comprising:

a first protective layer between the optical compensation layer and the polarizing base layer;

10. A display device, characterized in that the display device comprises at least:

the polarizer of any of claims 1 to 9;