CN108828706A - Display device - Google Patents

Abstract

A display device. The display device includes a display panel, a first polarizing structure and a second polarizing structure. The display panel has a first surface and a second surface, the second surface being opposite to the first surface. The first polarizing structure is disposed on the first surface. The first polarizing structure includes a first polarizing film and has a first thickness. The second polarizing structure is disposed on the second surface. The second polarizing structure includes a second polarizing film and has a second thickness, wherein the absorption axis of the first polarizing film and the absorption axis of the second polarizing film are perpendicular to each other. The first polarizing film has a first moment τ1, the second polarizing film has a second moment τ2, and the first moment τ1 and the second moment τ2 satisfy the following equations 1, 2 and 3: τ1=r1×d1×L ₀ equation 1 ; τ2＝r2×d2×L ₉₀ Formula 2; │τ1‑τ2│≦0.5 Formula 3; where r1 is the shrinkage rate of the first polarizing film, d1 is the first thickness, and L ₀ is the absorption axis of the first polarizing film length, r2 is the shrinkage rate of the second polarizing film, d2 is the second thickness, and L ₉₀ is the absorption axis length of the second polarizing film.

Description

display device

technical field

The present disclosure relates to a display device.

Background technique

Based on the development of smart phones, many in-vehicle information systems have the ability to connect smart phones and tablet computers to expand functions, and even have developed an integrated system. The concept of smart cars is starting to be widely discussed. Whether it is using a smartphone to transmit music to the car stereo or control the central lock of the car through Bluetooth, or using a 4G mobile network to connect to the Internet to play videos to entertain passengers, it will become more common in the future. In addition, vehicle-mounted displays are mostly used to display important information such as satellite navigation, multimedia entertainment, and even the speed per hour or vehicle status on the dashboard.

Polarizers used in automotive liquid crystal displays are different from ordinary liquid crystal displays. The harsh conditions of the outdoor environment are a major test for the weather resistance of polarizers, such as driving in humid and rainy, hot or cold areas, and outdoors with large temperature differences. In a parking environment, a high-vibration driving environment, or in midsummer, the ambient temperature of a vehicle LCD display may be as high as 50°C, and the temperature of some surfaces directly exposed to sunlight may even reach 70-80°C. Automobile manufacturers usually require that the panel operating temperature specification must be between -30 and 85°C, and the storage temperature specification must be between -40 and 95°C. Therefore, when designing an in-vehicle LCD display, it will choose a higher specification for the vehicle. specification material.

However, after the automotive polarizer has been tested in a harsh high-temperature environment, it often suffers from warping (bending) phenomenon caused by high-temperature shrinkage, and the warping phenomenon causes the panel to deform and be squeezed to the frame, which in turn causes light leakage from the edge of the display. question.

Contents of the invention

The present disclosure relates to a display device. In the embodiment, by controlling the absolute value of the difference between the first moment τ of the first polarizing film and the second moment τ of the second polarizing film in the display device to be less than or equal to 0.5, warping of the display panel can be effectively suppressed. The degree of curvature can further suppress the light leakage phenomenon caused by the warpage of the display panel.

According to an embodiment of the present disclosure, a display device is provided. The display device includes a display panel, a first polarizing structure and a second polarizing structure. The display panel has a first surface and a second surface, and the second surface is opposite to the first surface. The first polarizing structure is disposed on the first surface of the display panel, the first polarizing structure includes a first polarizing film, and the first polarizing structure has a first thickness. The second polarizing structure is disposed on the second surface of the display panel, the second polarizing structure includes a second polarizing film, and the second polarizing structure has a second thickness, wherein the absorption axis of the first polarizing film and the absorption axis of the second polarizing film perpendicular to each other. The first polarizing film has a first moment τ1, the second polarizing film has a second moment τ2, and the first moment τ1 and the second moment τ2 satisfy the following formulas 1, 2 and 3:

τ1＝r1×d1×L ₀ Formula 1;

τ2=r2×d2×L ₉₀ formula 2;

│τ1-τ2│≦0.5 Formula 3;

Among them, r1 is the shrinkage rate of the first polarizing film, d1 is the first thickness, _L0 is the absorption axis length of the first polarizing film, r2 is the shrinkage rate of the second polarizing film, d2 is the second thickness, and _L90 is the second thickness. The length of the absorption axis of the two polarizers.

In order to have a better understanding of the above and other aspects of the present invention, specific embodiments will be exemplified below, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Description of drawings

FIG. 1 is a schematic perspective view of a display device according to an embodiment of the disclosure.

FIG. 2 is a schematic cross-sectional view of a display device according to an embodiment of the disclosure.

FIG. 3 is a schematic cross-sectional view of a display device according to another embodiment of the disclosure.

Among them, reference signs:

1, 2: display device

10: Display panel

10A: first surface

10B: second surface

20: The first polarizing structure

30: Second polarizing structure

110: length

120: width

210: first polarizing film

220: the first glue layer

230: First protective layer

240, 340: outer protective layer

310: second polarizing film

320: Second adhesive layer

330: Second protective layer

350: The third adhesive layer

360: The third layer of protection

A1, A2: absorption axis

d1: first thickness

d2: second thickness

Detailed ways

In the embodiments of the present disclosure, by controlling the absolute value of the difference between the first moment τ of the first polarizing film and the second moment τ of the second polarizing film in the display device to be less than or equal to 0.5, it is possible to effectively suppress The degree of warping of the display panel can further suppress light leakage caused by the warping of the display panel.

Various embodiments are provided below for detailed description, and the embodiments are only used as illustrations, and do not limit the protection scope of the present invention. In different embodiments and drawings, the same elements will be represented by the same element symbols. It should be noted that these specific examples are not intended to limit the present invention. The invention can still be practiced with other features, elements, methods and parameters. The embodiments are provided only to illustrate the technical characteristics of the present invention, and are not intended to limit the protection scope of the present invention. Those skilled in the art will be able to make equivalent modifications and changes according to the description of the following specification without departing from the scope of the spirit of the present invention. In addition, some components are omitted from the drawings in the embodiments to clearly show the technical characteristics of the present invention.

FIG. 1 is a schematic perspective view of a display device according to an embodiment of the present disclosure, and FIG. 2 is a schematic cross-sectional view of a display device according to an embodiment of the present disclosure.

As shown in FIGS. 1-2 , the display device 1 includes a display panel 10 , a first polarizing structure 20 and a second polarizing structure 30 . The display panel 10 has a first surface 10A and a second surface 10B, and the second surface 10B is opposite to the first surface 10A. The first polarizing structure 20 is disposed on the first surface 10A of the display panel 10 , the first polarizing structure 20 includes a first polarizing film 210 , and the first polarizing structure 20 has a first thickness d1. The second polarizing structure 30 is disposed on the second surface 10B of the display panel 10, the second polarizing structure 30 includes a second polarizing film 310, and the second polarizing structure 30 has a second thickness d2, wherein the absorption axis of the first polarizing film 210 A1 and the absorption axis A2 of the second polarizing film 310 are perpendicular to each other. The first polarizing film 210 has a first moment τ1, the second polarizing film 310 has a second moment τ2, and the first moment τ1 and the second moment τ2 satisfy the following formulas 1, 2 and 3:

τ1＝r1×d1×L ₀ Formula 1;

τ2=r2×d2×L ₉₀ formula 2;

│τ1-τ2│≦0.5 Formula 3;

Wherein, r1 is the shrinkage rate of the first polarizing film 210, d1 is the first thickness, _L0 is the absorption axis length of the first polarizing film 210, r2 is the shrinkage rate of the second polarizing film 310, d2 is the second thickness, L ₉₀ is the length of the absorption axis of the second polarizing film 310 .

In an embodiment of the present disclosure, the shrinkage ratio r1 of the first polarizing film 210 and the shrinkage ratio r2 of the second polarizing film 310 are respectively the first polarizing film 210 having a size of 2 millimeters (mm)×10 millimeters (mm). and the second polarizing film 310 are placed in a thermal analyzer at a temperature of 95° C. for measurement. In some embodiments, the shrinkage ratio r1 of the first polarizing film 210 and the shrinkage ratio r2 of the second polarizing film 310 are 0N (N)-8N, preferably 2N-5N.

According to an embodiment of the present disclosure, by controlling the difference between the first moment τ1 of the first polarizing film 210 and the second moment τ2 of the second polarizing film 310 to meet the above conditions, the warpage of the display panel 10 can be effectively suppressed. (Bending), and when the moment difference is smaller, the degree of warping of the display panel 10 is smaller, so that the light leakage phenomenon caused by the warping of the display panel can be suppressed.

According to an embodiment of the present disclosure, as shown in FIGS. 1-2 , the first thickness d1 is, for example, the distance between the outer surface of the first polarizing film 210 and the display panel 10 , and the second thickness d2 is, for example, the distance between the second polarizing film. The distance between the outer surface of 310 and the display panel 10 .

According to an embodiment of the present disclosure, the distance (first thickness d1) between the first polarizing film 210 and the display panel 10 and the distance (second thickness d2) between the second polarizing film and the display panel 10 refer to bonding The thickness of the film material on both sides of the display panel 10 , and the respective superimposed total film thicknesses on both sides will affect the difference between the first moment τ1 and the second moment τ2 . Moreover, the difference in the direction of the absorption axis of the first polarizing film 210 and the second polarizing film 310 will also cause a difference in moment, which in turn affects the warping direction of the display panel. Therefore, the influence of the length of the absorption axis in different directions must also be considered. The calculation The result of the difference in moment can represent the overall warping direction. If the difference in moment is positive, the overall warpage is warping toward the first polarizing film 210, and the larger the difference in moment, the greater the warpage. On the contrary, if the moment difference is negative, the overall warping is warping toward the second polarizing film 310 .

In other words, according to the embodiment of the present disclosure, the difference between the first moment τ1 of the first polarizing film 210 and the second moment τ2 of the second polarizing film 310 needs to consider all of Equation 1, Equation 2 and Equation 3 Factors, including the shrinkage ratio (r1, r2) of the two polarizing films, the thickness of the two polarizing structures (d1, d2) and the absorption axis length (L ₀ , L ₉₀ ) of the two polarizing films, are not single or only two Factors can fully affect the torque difference. Specifically, the shrinkage rate of the polarizing film is used to represent the shrinkage characteristics of the material of the polarizing film, and the thickness of the polarizing structure and the length of the absorption axis of the polarizing film further take into account the factors affecting the area and thickness direction, so the overall warping of the display device The improvement of the degree of curvature is determined based on the result of the difference between the first moment τ1 of the first polarizing film 210 and the second moment τ2 of the second polarizing film 310 .

In some embodiments, when the ratio of the length 110 to the width 120 of the display panel 10 is 1.0-1.5, the difference between the first moment τ1 and the second moment τ2 is 0Nm (Nm)-0.4Nm, preferably 0Nm to 0.3Nm, more preferably 0Nm to 0.20Nm.

In some embodiments, when the ratio of the length 110 to the width 120 of the display panel 10 is 1.5-2, the difference between the first moment τ1 and the second moment τ2 is 0Nm-0.3Nm, preferably 0Nm-0.2Nm , more preferably 0Nm to 0.15Nm.

In some embodiments, when the ratio of the length 110 to the width 120 of the display panel 10 is 2.0-2.3, the difference between the first moment τ1 and the second moment τ2 is 0Nm-0.4Nm, preferably 0Nm-0.3Nm , more preferably 0Nm to 0.2Nm.

In some embodiments, when the ratio of the length 110 to the width 120 of the display panel 10 is 2.3-3.0, the difference between the first moment τ1 and the second moment τ2 is 0Nm-0.5Nm, preferably 0Nm-0.4Nm , more preferably 0Nm to 0.3Nm.

As shown in FIGS. 1-2 , in the embodiment, the first polarizing structure 20 may further include a first adhesive layer 220 and a first protective layer 230 , and the first adhesive layer 220 may be adhered to the first surface 10A of the display panel 10 , the first protection layer 230 is disposed on the first adhesive layer 220 , and the first polarizing film 210 is disposed on the first protection layer 230 . In this embodiment, the total thickness of the first adhesive layer 220 , the first protective layer 230 and the first polarizing film 210 is the first thickness d1 . The thickness range of the first thickness d1 may be 15 microns to 160 microns, and a preferred thickness range is 60 microns to 110 microns.

As shown in FIGS. 1-2 , in an embodiment, the second polarizing structure 30 may further include a second adhesive layer 320 and a second protective layer 330 , and the second adhesive layer 320 may be bonded to the second surface 10B of the display panel 10 , the second protective layer 330 is disposed on the second adhesive layer 320 , and the second polarizing film 310 is disposed on the second protective layer 330 . In this embodiment, the total thickness of the second adhesive layer 320 , the second protective layer 330 and the second polarizing film 310 is the second thickness d2 . The second thickness d2 may range from 15 microns to 160 microns, and preferably ranges from 60 microns to 110 microns.

In an embodiment, the first thickness d1 and the second thickness d2 may be the same or different. In some embodiments, the difference between the first thickness d1 and the second thickness d2 may be between 0 micrometers (μm) and 170 micrometers, and a preferable range of the difference may be between 0 micrometers and 100 micrometers. For example, it may be greater than or equal to 20 microns; in some other embodiments, the difference between the first thickness d1 and the second thickness d2 may be greater than or equal to 25 microns; in some other embodiments, the difference between the first thickness d1 and the second thickness d2 The difference, for example, can be greater than or equal to 65 microns; in some other embodiments, the difference between the first thickness d1 and the second thickness d2, for example, can be greater than or equal to 100 microns; in some other embodiments, the difference between the first thickness d1 and the second thickness The difference in d2 can be, for example, less than or equal to 170 microns.

In an embodiment, the display panel 10 is a liquid crystal display panel, such as an IPS liquid crystal display panel or a VA liquid crystal display panel.

In an embodiment, as shown in FIGS. 1-2 , the display device 1 may further include two outer protective layers 240, 340, and the outer protective layer 240 and the outer protective layer 340 are respectively disposed on the outer sides of the first polarizing film 210. and the outside of the second polarizing film 310 .

In an embodiment, the material of the first polarizing film 210 and the second polarizing film 310 may be polyvinyl alcohol (PVA) resin film, and the polyvinyl alcohol film may be prepared by saponifying polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a monomeric polymer of vinyl acetate, ie, polyvinyl acetate, and a copolymer of vinyl acetate and other monomers capable of copolymerization with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids (such as acrylic acid, methacrylic acid, ethyl acrylate, n-propyl acrylate, methyl methacrylate), olefins (such as ethylene, propylene, 1 -butene, 2-methpropylene), vinyl ethers (such as ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (such as vinyl sulfonic acid, vinyl sodium sulfonate), etc. The thickness of the first polarizing film 210 and the thickness of the second polarizing film 310 may be respectively 5-35 microns, preferably 20-30 microns, such as about 25 microns.

In an embodiment, the materials of the first protective layer 230, the second protective layer 330 and the outer protective layers 240, 340 can be thermoplastic resins with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc., for example, can include Cellulose-based resins, acrylic resins, non-crystalline polyolefin-based resins, polyester-based resins, polycarbonate-based resins, and combinations thereof, specifically including polymethylmethacrylate (Polymethylmethacrylate, PMMA), cellulose-based resins It refers to the resin in which part of the hydroxyl groups in cellulose is esterified by acetate, or a mixed ester in which part is esterified by acetate and part by other esterification. The cellulose resin is preferably a cellulose ester resin, more preferably an acetyl cellulose resin, such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose acetate Butyrate, etc., fully esterified cellulose is called triacetate cellulose (TAC), acrylic resin film, polyaryl hydroxy resin film, polyether resin film, cyclopolyolefin resin film (such as polybornene Resin film), polycarbonate resin such as polyester formed by carbonic acid and diol or bisphenol, such as: polyethylene terephthalate (Polyethylene Terephthalate, PET), polypropylene (Polypropylene, PP), Polyethylene (PE), non-crystalline polyolefin series resins such as cyclic olefin monomer (co) polymers (cyclo olefin (co) polymers, COC/COP), composed of norbornene, cyclopentadiene, di A group consisting of ring-opening polymers such as cyclopentadiene and tetracyclododecene, or copolymers with olefins, polycarbonate (PC), and any combination of the above. In addition, the protective layer material can also be, for example, thermosetting resins such as (meth)acrylic, urethane, acrylic urethane, epoxy, polysiloxane, etc., or ultraviolet curable resins. type resin. In addition, the protective layer may be further subjected to surface treatment, for example, anti-glare treatment, anti-reflection treatment, hard-coat treatment, anti-static treatment, or anti-fouling treatment. In an embodiment, the thickness of the first protective layer 230, the thickness of the second protective layer 330, the thickness of the outer protective layer 240 and the thickness of the outer protective layer 340 can be respectively 5-90 microns, preferably 20-50 microns , such as about 20-40 microns.

In an embodiment, the first adhesive layer 220 and the second adhesive layer 320 are, for example, pressure sensitive adhesive or optical adhesive. The thickness of the first adhesive layer 220 and the thickness of the second adhesive layer 320 may be respectively 5-35 microns, preferably 20-30 microns, such as about 25 microns.

FIG. 3 is a schematic cross-sectional view of a display device according to another embodiment of the disclosure. In this embodiment, the same or similar elements as those in the preceding embodiments use the same or similar element numbers, and for related descriptions of the same or similar elements, please refer to the foregoing, and details are not repeated here.

In the display device 2, the second polarizing structure 30 further includes a third adhesive layer 350 and a third protective layer 360, the third adhesive layer 350 is bonded to the second protective layer 330, and the third protective layer 360 is disposed on the third adhesive layer 350 Above, the third adhesive layer 350 and the third protective layer 360 are located between the second adhesive layer 320 and the second polarizing film 310 . In this embodiment, the total thickness of the second adhesive layer 320 , the third protective layer 360 , the third adhesive layer 350 , the second protective layer 330 and the second polarizing film 310 is the second thickness d2. The second thickness d2 may range from 25 microns to 285 microns, and preferably ranges from 100 microns to 190 microns.

The following examples will be further described. The structural details, moment values, and light leakage test results of the polarizing structures of several examples and comparative examples are listed below to illustrate the characteristics of the display device made by applying the present disclosure, wherein a glass substrate with a thickness of 0.5 mm is used instead of the display panel for the following tests and characteristic measurements. However, the following examples are for illustrative purposes only and should not be construed as limitations on the implementation of the present disclosure.

The aspect ratio of the glass substrates in the following Examples 1 to 4 and Comparative Example 1 is 16:9, the size of the glass substrate is 272.3mm×153.17mm, the absorption axis length L ₀ is 272.3mm, and the absorption axis length L ₉₀ is 153.17mm The aspect ratio of the glass substrates of Examples 6-8 and Comparative Example 2 is 21:9, the size of the glass substrates is 287.16mm × 123.07mm, the absorption axis length L ₀ is 287.16mm, and the absorption axis length L ₉₀ is 123.07mm , and the thickness of the outer protective layer 240 and the thickness of the outer protective layer 340 are both 40 microns; the warping result indicates the height of the edge warping protrusion of the sample after the condition treatment. Please refer to Table 1 for other related data.

Table 1

Table 1 (continued)

To sum up, although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Accordingly, the protection scope of the present invention is determined by the appended claims.

Claims (13)

1. a kind of display device, including：

Display panel has first surface and second surface, and the second surface is relative to the first surface；

First structure of polarized light is set on the first surface of the display panel, and first structure of polarized light includes first Light polarizing film, and first structure of polarized light has first thickness；With

Second structure of polarized light is set on the second surface of the display panel, and second structure of polarized light includes second Light polarizing film, and second structure of polarized light has second thickness, wherein the absorption axiss of first light polarizing film and described second are partially The absorption axiss of light film are perpendicular to one another；

Wherein, first light polarizing film has the first torque τ 1, and second light polarizing film has the second torque τ 2, first power Square τ 1 and the second torque τ 2 meet the following Expression 1, formula 2 and formula 3：

τ 1=r1 × d1 × L₀Formula 1；

τ 2=r2 × d2 × L₉₀Formula 2；

2 formula of │≤0.5 3 of │ τ 1- τ；

Wherein, r1 is the first shrinking percentage of first light polarizing film, and d1 is the first thickness, L₀For first light polarizing film Shaft length is absorbed, r2 is the second shrinking percentage of second light polarizing film, and d2 is the second thickness, L₉₀For second light polarizing film Absorption shaft length.

2. display device according to claim 1, wherein the length of the display panel is 1.0 relative to the ratio of width The difference of~1.5, the first torque τ 1 and the second torque τ 2 are 0Nm~0.4Nm；Or the length phase of the display panel Ratio for width is 1.5~2, and the difference of the first torque τ 1 and the second torque τ 2 are 0Nm~0.3Nm.

3. display device according to claim 1, wherein the length of the display panel is 2.0 relative to the ratio of width The difference of~2.3, the first torque τ 1 and the second torque τ 2 are 0Nm~0.4Nm；Or the length phase of the display panel Ratio for width is 2.3~3.0, and the difference of the first torque τ 1 and the second torque τ 2 are 0Nm~0.5Nm.

4. display device according to claim 1, wherein first structure of polarized light further comprises：

First glue-line is bonded to the first surface of the display panel；With

First protective layer is set on first glue-line, wherein first light polarizing film is set on first protective layer.

5. display device according to claim 4, wherein second structure of polarized light further comprises：

Second glue-line is bonded to the second surface of the display panel；With

Second protective layer is set on second glue-line, wherein second light polarizing film is set on second protective layer.

6. display device according to claim 5, wherein the first thickness is first glue-line, first protection The overall thickness of layer and first light polarizing film, and the second thickness is second glue-line, second protective layer and described The overall thickness of second light polarizing film.

7. display device according to claim 6, wherein the range of the first thickness is 15 microns~160 microns, and/ Or the range of the second thickness is 15 microns~160 microns.

8. display device according to claim 5, wherein second structure of polarized light further comprises：

Third glue-line is bonded to second protective layer；And

Third protective layer is set on the third glue-line, wherein the third glue-line and the third protective layer are positioned at described Between second glue-line and second light polarizing film.

9. display device according to claim 8, wherein

The first thickness is the overall thickness of first glue-line, first protective layer and first light polarizing film；And

The second thickness is second glue-line, the third protective layer, the third glue-line, second protective layer and institute State the overall thickness of the second light polarizing film.

10. display device according to claim 9, wherein the range of the first thickness is 15 microns~160 microns, And/or the range of the second thickness is 25 microns~285 microns.

11. display device according to claim 1, wherein the difference of the first thickness and the second thickness is 0 micro- Rice is between 170 microns；And/or described the of the first shrinking percentage r1 of first light polarizing film and second light polarizing film Two shrinking percentage r2 are respectively 0N~8N.

12. display device according to claim 1, wherein the display panel is IPS liquid crystal display panel or VA liquid crystal Display panel.

13. display device according to claim 1, further comprises：

Two outer protective layers are respectively arranged at the outside of first light polarizing film and the outside of second light polarizing film.