TWI672545B - 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, 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. The absorption axis of the first polarizing film and the The absorption axes are perpendicular to each other. The first polarizing film has a first moment correlation coefficient τ1, the second polarizing film has a second moment correlation coefficient τ2, and the first moment correlation coefficient τ1 and the second moment correlation coefficient τ2 satisfy the following formulas 1, 2 and 3: τ1 = r1 x d1 x L ₀ Formula 1; τ2 = r2 x d2 x L ₉₀ Formula 2; | τ1-τ2 | ≦ 0.3 Formula 3

Among them, r1 is the shrinking force of the first polarizing film, d1 is the first thickness, L ₀ is the length of the absorption axis of the first polarizing film, r2 is the shrinking force of the second polarizing film, and d2 is the second thickness L ₉₀ is the absorption axis length of the second polarizing film.

Description

Display device

The present disclosure relates to a display device.

Based on the development of smartphones, many in-vehicle information systems have the ability to connect smartphones and tablets to expand functions, and even integrated systems have been developed. Therefore, they rely entirely on the screens and software and hardware of smartphones and tablets The concept of smart cars as the main body of operation has begun to be widely discussed. Whether it is using a smart phone to transfer music to the car stereo or controlling the car's central lock with 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, automotive displays are mostly used to display important information such as satellite navigation, multimedia entertainment, and even dashboard speeds or vehicle conditions.

Polarizers for LCDs used in cars are different from ordinary LCDs. The harsh conditions of outdoor environments are a test of the weatherability of polarizers, such as driving in humid and rainy, hot or cold areas, and outdoors with high and low temperature drops. In a parking environment, a high-vibration driving environment, or in the summer season, the ambient temperature of the vehicle's LCD monitor may be as high as 50 ° C or more, and some surface temperatures directly affected by sunlight can even reach 70 ~ 80 ° C. Car manufacturers usually require panel operating temperature specifications to be -30 ~ 85 ° C The storage temperature specification must be between -40 ~ 95 ° C. Therefore, when designing the LCD display in a car, materials with higher specifications will be selected according to the car specifications.

However, after being subjected to severe high-temperature environmental tests, automotive polarizing plates often cause warping due to high-temperature shrinkage, and the warping phenomenon causes the panel to deform and squeeze into the frame, which causes light leakage at the edges of the display. .

This disclosure relates to a display device. In the embodiment, by controlling the absolute value of the difference between the first moment correlation coefficient τ1 of the first polarizing film and the second moment correlation coefficient τ2 of the second polarizing film in the display device, it can be effective Suppressing the warping width of the display panel can further reduce the light leakage phenomenon caused by the warping 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. The absorption axis of the first polarizing film and the The absorption axes are perpendicular to each other. The first polarizing film has a first moment correlation coefficient τ1, the second polarizing film has a second moment correlation coefficient τ2, and the first moment correlation coefficient τ1 and the second moment correlation coefficient τ2 satisfy the following formulas 1, 2 and 3: τ1 = r1 x d1 x L ₀ Formula 1; τ2 = r2 x d2 x L ₉₀ Formula 2; | τ1-τ2 | ≦ 0.3 Formula 3

Among them, r1 is the shrinking force of the first polarizing film, d1 is the first thickness, L ₀ is the length of the absorption axis of the first polarizing film, r2 is the shrinking force of the second polarizing film, and d2 is the second thickness L ₉₀ is the absorption axis length of the second polarizing film.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are described in detail below in conjunction with the accompanying drawings:

1, 2‧‧‧ display device

10‧‧‧Display Panel

10A‧‧‧first surface

10B‧‧‧Second surface

20‧‧‧First polarized structure

30‧‧‧Second polarizing structure

110‧‧‧ length

120‧‧‧Width

210‧‧‧first polarizing film

220‧‧‧ the first adhesive layer

230‧‧‧first protective layer

240, 340‧‧‧ Outer protective layer

310‧‧‧Second polarizing film

320‧‧‧Second glue layer

330‧‧‧Second protective layer

350‧‧‧ third adhesive layer

360‧‧‧third protective layer

A1, A2‧‧‧‧Absorption axis

d1‧‧‧first thickness

d2‧‧‧second thickness

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.

In the embodiment of the present disclosure, the absolute value of the difference between the first moment correlation coefficient τ1 of the first polarizing film and the second moment correlation coefficient τ2 of the second polarizing film in the display device is controlled to be less than or equal to 0.3, can effectively suppress the The warpage amplitude of the display panel can further suppress the light leakage phenomenon caused by the warpage of the display panel.

The following is a detailed description of various embodiments. The embodiments are only used as examples, and do not limit the 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 embodiments are not intended to limit the present invention. The invention can still be implemented with other features, elements, methods and parameters. The proposal of the embodiments is only used to illustrate the technical features of the present invention, and is not intended to limit the scope of patent application of the present invention. Those with ordinary knowledge in the technical field can make equal modifications and changes according to the description of the following description without departing from the spirit of the present invention. In addition, some elements in the drawings in the embodiments are omitted to clearly show the technical features of the present invention.

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

As shown in FIGS. 1 and 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. 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. The absorption axis 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 correlation coefficient τ1, and the second polarizing film 310 has a second moment correlation coefficient τ2. The first moment correlation coefficient τ1 and the second moment correlation coefficient τ2 satisfy the following formula 1, formula 2 and formula 3: τ1 = r1 x d1 x L ₀ Formula 1; τ2 = r2 x d2 x L ₉₀ Formula 2; | τ1-τ2 | ≦ 0.3 Formula 3

Wherein, r1 is the contractile force of the first polarizing film 210, d1 is the first thickness, L ₀ is the length of the absorption axis of the first polarizing film 210, r2 is a second polarizing film shrinkage force 310, d2 is the second thickness, L ₉₀ is an absorption axis length of the second polarizing film 310.

In the embodiment of the present disclosure, the shrinking force r1 of the first polarizing film 210 and the shrinking force r2 of the second polarizing film 310 are the first polarizing film 210 having a size of 2 millimeters (mm) x 10 millimeters (mm), respectively. The second polarizing film 310 and the second polarizing film 310 are measured in a thermal analyzer at a temperature of 95 ° C. In some embodiments, the shrinking force r1 of the first polarizing film 210 and the shrinking force r2 of the second polarizing film 310 are independently 0N (Newton) to 8N, and preferably 2N to 5N.

According to the embodiment of the present disclosure, by controlling the difference between the first moment correlation coefficient τ1 of the first polarizing film 210 and the second moment correlation coefficient τ2 of the second polarizing film 310 under the above conditions, the difference can be effectively suppressed. Bending of the display panel 10, and the smaller the difference of the moment correlation coefficient is, the smaller the amplitude of the warping of the display panel 10 is, and the light leakage phenomenon caused by the warping of the display panel can be suppressed.

According to the embodiment of the disclosure, as shown in FIGS. 1 and 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 second polarized light. The distance between the outside surface of the film 310 and the display panel 10.

According to the embodiment of the present disclosure, the distance between the first polarizing film 210 and the display panel 10 (first thickness d1) and the distance between the second polarizing film and the display panel 10 (second thickness d2) represent the bonding The thickness of the film material on both sides of the display panel 10, and the respective total superimposed film thicknesses on both sides of the display panel 10 will affect the difference between the first moment correlation coefficient τ1 and the second moment correlation coefficient τ2. Furthermore, different directions of the absorption axis of the first polarizing film 210 and the second polarization film 310 will also cause a difference in the moment correlation coefficient, which will affect 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 calculated difference value of the torque correlation coefficient can indicate the overall warping direction. If the difference in the torque correlation coefficient is positive, the overall warping direction is warping in the direction of the first polarizing film 210, and the torque correlation The larger the difference of the coefficients is, the more serious the warping degree is; on the contrary, if the difference of the moment correlation coefficient is negative, the entire warping direction is warping in the direction of the second polarizing film 310.

In other words, according to the embodiment of the disclosure, the difference between the first moment correlation coefficient τ1 of the first polarizing film 210 and the second moment correlation coefficient τ2 of the second polarizing film 310 needs to consider Equation 1, Equation 2 and Equation at the same time. 3 all factors, including two polarizing contractile force (r1, r2), the thickness of the two polarization structure (d1, d2) and two polarizing absorption axis length (L _0, L ₉₀₎ associated torque, The difference of the coefficients is not completely affected by a single or only two factors. In detail, the shrinking force of the polarizing film is used to indicate the shrinking characteristics of the material of the polarizing film, and the thickness of the polarizing structure and the absorption axis length of the polarizing film further take into consideration the factors affecting the area and thickness direction, so the overall display device The improvement of the degree of curvature is determined based on a result of a difference between the first moment correlation coefficient τ1 of the first polarizing film 210 and the second moment correlation coefficient 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 to 1.5, the difference between the first moment correlation coefficient τ1 and the second moment correlation coefficient τ2 is 0N˙cm˙cm (Newton˙ Cm ~ cm) ~ 0.4N˙cm˙cm, preferably 0N˙cm˙cm ~ 0.3N˙cm˙cm, more preferably 0N˙cm˙cm ~ 0.20N˙cm˙cm.

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

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

In some embodiments, when the ratio of the length 110 to the width 120 of the display panel 10 is 2.3 to 3.0, the first moment correlation coefficient τ1 and the second moment correlation The difference between the coefficients τ2 is 0N˙cm˙cm ~ 0.4N˙cm˙cm, preferably 0N˙cm˙cm ~ 0.3N˙cm˙cm.

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

As shown in FIGS. 1 and 2, in the embodiment, the second polarizing structure 30 may further include a second adhesive layer 320 and a second protective layer 330. The second adhesive layer 320 may be adhered to the second surface of the display panel 10. 10B, 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 first thickness d2 may have a thickness ranging from 15 μm to 160 μm, and a preferred thickness range is from 60 μm to 110 μm.

In the 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 preferred difference range 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 first thickness d1 and the second thickness The difference of d2 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 may be, for example, greater than or equal to 100 microns; in some other embodiments, the difference between the first thickness d1 and the second thickness d2 is, for example, It can be less than or equal to 170 microns.

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

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

In the embodiment, a material of the first polarizing film 210 and the second polarizing film 310 may be a polyvinyl alcohol (PVA) resin film, and the polyvinyl alcohol film may be made by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a single polymer of vinyl acetate, that is, polyvinyl acetate, and a copolymer of vinyl acetate and other monomers capable of copolymerizing with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g. acrylic acid, methacrylic acid, ethyl acrylate, propyl n-acrylate, methyl methacrylate), olefins (e.g. ethylene, propylene, 1 -Butene, 2-methylpropene), vinyl ethers (e.g. ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (e.g. vinyl sulfonic acid, vinyl Sodium sulfonate) and so on. The thickness of the first polarizing film 210 and the thickness of the second polarizing film 310 may be independently 5 to 35 microns, preferably 20 to 30 microns, such as about 25 microns.

In the embodiment, the materials of the first protective layer 230, the second protective layer 330, and the outer protective layers 240 and 340 may be thermoplastic resins having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, and the like, and may include fibers, for example. Plain resin, acrylic Acid-based resins, amorphous polyolefin-based resins, polyester-based resins, polycarbonate-based resins, and combinations thereof, may specifically include polymethylmethacrylate (PMMA), and cellulose-based resins refer to cellulose Part of the hydroxy resin is esterified with resin, or part of the ester is mixed with other esters. The cellulose resin is preferably a cellulose ester resin, more preferably an ethyl cellulose resin, such as triethyl cellulose, diethyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate, etc., are fully esterified cellulose called triacetate cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, cyclic polyolefin resin film (such as poly Borneene resin film), polycarbonate resins such as polyesters formed from carbonic acid and diols or bisphenols, such as: Polyethylene Terephthalate (PET), Polypropylene (PP) ), Polyethylene (PE), amorphous polyolefin resins such as cyclic olefin (co) polymers (COC / COP), composed of norbornene, cyclopentadiene A group consisting of ring-opening polymers such as dicyclopentadiene, tetracyclododecene, or copolymers with olefins, polycarbonate (PC), and any combination of the foregoing. In addition, the protective layer material may be, for example, a thermosetting resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone, or ultraviolet curing. Type resin. In addition, the protective layer may be further subjected to a surface treatment, for example, an anti-glare treatment, an anti-reflection treatment, a hard coating treatment, a charging prevention treatment, or an antifouling treatment. In the embodiment, the thickness of the first protective layer 230, the thickness of the second protective layer 330, and the outer protective layer 240 The thickness of the outer layer and the thickness of the outer protective layer 340 may be independently 5 to 90 micrometers, preferably 20 to 50 micrometers, such as about 20 to 40 micrometers.

In the 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 independently 5 to 35 micrometers, preferably 20 to 30 micrometers, such as about 25 micrometers.

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 components are denoted by the same or similar components, and related descriptions of the same or similar components are referred to the foregoing, and will not be 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 adhered to the second protective layer 330, and the third protective layer 360 is disposed on the third adhesive layer. On 350, 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 first thickness d2 may have a thickness ranging from 25 μm to 285 μm, and a preferred thickness range is from 100 μm to 190 μm.

The embodiments are further described below. The following series presents the structural details, moment correlation coefficient values, and light leakage test results of the polarized structures of several examples and comparative examples to illustrate the characteristics of the display device made by applying this disclosure. A glass substrate with a thickness of 0.5 mm is used. Replace the display panel for the following tests and Characteristic measurement. However, the following embodiments are for illustrative purposes only and should not be construed as limitations on the implementation of the disclosure.

The glass substrates in the following Examples 1 to 4 and Comparative Example 1 have a length-to-width ratio of 16: 9, the dimensions of the glass substrate are 272.3mm x 153.17mm, the absorption shaft length L ₀ is 272.3mm, and the absorption shaft length L ₉₀ is 153.17mm. ; The ratio of length to width of the glass substrates of Examples 5 to 7 and Comparative Example 2 was 21: 9, the size of the glass substrate was 287.16mm x 123.07mm, the absorption axis length L ₀ was 287.16mm, and the absorption axis length L ₉₀ was 123.07mm The thickness of the outer protective layer 240 and the thickness of the outer protective layer 340 are both 40 micrometers; the warpage result indicates the height of the warped protrusions on the edges of the sample after the conditions are processed. Please refer to Table 1 for other related data.

In summary, although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (12)

A display device includes: a display panel having a first surface and a second surface opposite to the first surface; a first polarizing structure 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; and a second polarizing structure is disposed on the second surface of the display panel. The second polarizing structure includes a 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 are perpendicular to each other; wherein the first polarizing film has a first A moment correlation coefficient τ1. The second polarizing film has a second moment correlation coefficient τ2. The first moment correlation coefficient τ1 and the second moment correlation coefficient τ2 satisfy the following formulas 1, 2 and 3: τ1 = r1 x d1 x L ₀ Formula 1; τ2 = r2 x d2 x L ₉₀ Formula 2; | τ1-τ2 | ≦ 0.26 Formula 3 where r1 is a first shrinking force of the first polarizing film, and d1 is the first Thickness, L ₀ is the absorption axis length of the first polarizing film, and r 2 is the first A second contraction force of the two polarizing films, d2 is the second thickness, and L ₉₀ is the absorption axis length of the second polarizing film. The display device according to item 1 of the scope of patent application, wherein a ratio of the length of the display panel to the width is 1.5 to 2 or 2.3 to 3. The display device according to item 1 of the scope of patent application, wherein the first polarizing structure further includes: a first adhesive layer adhered to the first surface of the display panel; and a first protective layer disposed on the first An adhesive layer, wherein the first polarizing film is disposed on the first protective layer. The display device according to item 3 of the scope of patent application, wherein the second polarizing structure further includes: a second adhesive layer adhered to the second surface of the display panel; and a second protective layer disposed on the first On the two adhesive layers, the second polarizing film is disposed on the second protective layer. The display device according to item 4 of the scope of patent application, wherein the first thickness is a total thickness of the first adhesive layer, the first protective layer, and the first polarizing film, and the second thickness is the second adhesive The total thickness of the layer, the second protective layer, and the second polarizing film. The display device according to item 5 of the scope of patent application, wherein the first thickness ranges from 15 μm to 160 μm, or / and the second thickness ranges from 15 μm to 160 μm. The display device according to item 4 of the scope of patent application, wherein the second polarizing structure further includes: a third adhesive layer adhered to the second protective layer; and A third protective layer is disposed on the third adhesive layer, wherein the third adhesive layer and the third protective layer are located between the second adhesive layer and the second polarizing film. The display device according to item 7 of the scope of patent application, wherein the first thickness is a total thickness of the first adhesive layer, the first protective layer, and the first polarizing film; and the second thickness is the second thickness The total thickness of the adhesive layer, the third protective layer, the third adhesive layer, the second protective layer, and the second polarizing film. The display device according to item 8 of the scope of patent application, wherein the first thickness ranges from 15 μm to 160 μm, or / and the second thickness ranges from 25 μm to 285 μm. The display device according to item 1 of the scope of patent application, wherein a difference between the first thickness and the second thickness is between 0 μm and 170 μm; and / or the first shrinkage force of the first polarizing film r1 and the second shrinking force r2 of the second polarizing film are independently 0N to 8N. The display device according to item 1 of the scope of patent application, wherein the display panel is an IPS liquid crystal display panel or a VA liquid crystal display panel. The display device according to item 1 of the scope of patent application, further includes: two outer protective layers, which are respectively disposed on the outside of the first polarizing film and the outside of the second polarizing film.