TWI616690B - Optical film structure and apparatus of aplying the same - Google Patents

Abstract

An optical film structure and an application device thereof. The optical film structure includes a first polarizing plate and an optical film. The first polarizing plate has a first outer haze; the optical film has a second outer haze, and is bonded to the first polarizing plate. There is an air gap between the optical film and the first polarizing plate; the thickness of the air gap is substantially between 100 micrometers (μm) and 300 micrometers, and the first outer haze and the second The sum of the external haze is between 12% and 40%.

Description

Optical diaphragm structure and application device thereof

The embodiment of the invention relates to an optical film structure and an application device thereof. In particular, it relates to a composite optical film structure and its application device.

With the rapid development of technology, portable electronic devices, such as mobile communication devices, are usually equipped with touch screens. And in order to prevent the screen from scratching and fine lines caused by rubbing hard objects, or to prevent the screen from reflecting the external light to generate glare, currently there are many commercially available composite functions, such as anti-scratch (HC), anti-glare (AG), anti-fingerprint (AF) and other surface-treated optical films are widely used in touch panels.

For factors such as high process yield and easy rework, optical films applied to touch display panels generally use a frame adhesive to adhere to other optical films of the display module, such as polarizing plates. Therefore, there is an air gap between the touch module and the display module. Since the distance between the two is quite close, when the user presses the touch panel with a finger or a stylus, the air gap does not change. Even light The interference pattern is like a halo image, that is, a phenomenon commonly known as "Newton's rings", which makes the viewer's visibility of the picture reduced, which affects the display effect of the picture. Especially under the current trend of thinning touch products, the air gap between the touch module and the display module is getting smaller and smaller, and the problem of Newton rings interfering with the screen display effect is more serious.

Therefore, there is a need to provide an advanced optical film structure and its application device to solve the problems faced by the conventional technology.

According to an embodiment of the present invention, an optical film structure is provided. The optical film structure includes a first polarizing plate and an optical film. The first polarizing plate has a first outer haze (Outer Haze); the optical film has a second outer haze, and is bonded to the first polarizing plate. There is an air gap between the optical film and the first polarizing plate; the thickness of the air gap is substantially between 100 micrometers and 300 micrometers, and the first outer haze and the second outer haze In total, the sum is between 12% and 40%.

Another embodiment of the present invention is to provide a touch display device. The touch display device includes a touch module, a display module, and an optical film structure as described above. The display module has a light emitting surface; the touch module surface is the light emitting surface; and the optical film structure is located between the display module and the touch module. Wherein, the first polarizing plate surface in the optical film structure is the light emitting surface.

According to the above, the embodiment of the present invention proposes an optical film junction Structure and a touch display device using the optical film structure. The optical film structure includes a polarizing plate and an optical film having a specific relationship of a specific external haze. The thickness of the air gap between the two is adjusted to eliminate the occurrence of the touch display device when it is pressed. The optical interference halo image is used to increase the visibility of the viewer's browsing screen, and to solve the phenomenon that the Newton ring affects the screen display effect in the conventional technology.

10‧‧‧Touch display device

100‧‧‧Optical diaphragm structure

101‧‧‧Optical diaphragm

101a‧‧‧Transparent substrate

101a1‧‧‧ Surface of transparent substrate

101b‧‧‧Surface treatment layer

101b1‧‧‧Transparent coating

101b2‧‧‧fine particles

102‧‧‧Air gap

103‧‧‧plastic frame

104‧‧‧first polarizing plate

104a‧‧‧First substrate layer

104b‧‧‧Second substrate layer

104c‧‧‧polarizing layer

105‧‧‧Surface treatment layer

200‧‧‧Display Module

201‧‧‧Display media

201a‧‧‧light surface

201b‧‧‧Into the light surface

202‧‧‧Second polarizing plate

203‧‧‧Adhesive layer

210‧‧‧Touch Module

H‧‧‧thickness of air gap

h‧‧‧ thickness of surface treatment layer

S‧‧‧Thickness of transparent substrate

FIG. 1 is a schematic structural cross-sectional view of an optical film structure according to an embodiment of the present invention; FIG. 2 is a partially enlarged view of the structural cross-section shown according to the optical film of FIG. 1; FIG. Is a schematic cross-sectional view showing a structure of a touch display device manufactured by applying the optical film structure of FIG. 1 according to an embodiment of the present invention.

The invention provides an optical film structure and an application device thereof, which can solve the problem that Newton's ring interferes with screen display effects in a conventional touch display device. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, several optical film structures and a touch display device using the optical film structure are specifically described in the following as preferred embodiments.

It must be noted that these specific implementation cases and methods, and It is not intended to limit the invention. The invention can still be implemented with other features, elements, methods and parameters. The proposal of the preferred embodiment 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 different embodiments and drawings, the same elements will be represented by the same element symbols.

Please refer to FIG. 1 to FIG. 2. FIG. 1 is a schematic cross-sectional view of a structure of an optical film structure 100 according to an embodiment of the present invention. The optical film structure 100 includes an optical film 101 and a first polarizing plate 104. The optical film 101 and the first polarizing plate 104 are bonded to each other. In some embodiments of the present invention, the optical film 101 and the first polarizing plate 104 are bonded by an adhesive tape (also known as “edge lamination”, air bonding), and the plastic frame 103 is used to bond each other. Adhesive, so that there is an air gap 102 between the optical film 101 and the first polarizing plate 104 with a thickness between 100 and 300 μm.

Specifically, the optical film 101 is implemented by a composite layer structure including a light-transmitting substrate 101a and a surface treatment layer 101b. In some embodiments of the present invention, the thickness S of the transparent substrate 101a is substantially between 20 micrometers and 120 micrometers. The transparent substrate 101a may be a rigid substrate (such as a glass substrate or a semiconductor substrate), or a flexible substrate (such as a plasticized film).

For example, in this embodiment, the optical film 101 can be used as an anti-split (AS) film attached to a glass substrate of a touch module. therefore, The material constituting the light-transmitting substrate 101a of the optical film 101 may be selected from the group consisting of polymethylmethacrylate (PMMA), triacetyl cellulose (TAC), polyester (Polyethylene Terephthalate, PET), A group consisting of Polypropylene (PP), Cyclo Olefin Polymer (COP), Polycarbonate (PC), and any combination thereof.

The surface treatment layer 101b may be a film layer directly attached to the surface 101a1 of the light-transmitting substrate 101a facing the first polarizing plate 104 in an attachment or deposition manner; or by a surface treatment method such as grinding or etching, A part of the light-transmitting substrate 101a is removed, and a surface profile having a specific thickness range is formed on the surface of the light-transmitting substrate 101a. In some embodiments of the present invention, the thickness h of the surface treatment layer 101b is substantially between 100 nanometers (nm) and 20 microns, and has a roughness (Ra) substantially between 0.05 microns and 0.5 microns ( (According to the arithmetic mean roughness specified in JIS B 0601 (1994)). By providing the surface treatment layer 101b on the surface of the light-transmitting substrate 101a, the optical film 101 can have a second external haze that is substantially between 0.1% and 30%.

Please refer to FIG. 2, which is a partially enlarged view of a structural cross section shown by the optical film 101 according to FIG. 1. In some embodiments of the present invention, the surface treatment layer 101b may include a light-transmitting coating layer 101b1 coated on the surface of the light-transmitting substrate 101a, and a plurality of light-transmitting coating layers 101b1 may be used for scattering or reflection. Particles 101b2 of light.

The light-transmitting coating 101b1 may be, for example, a rod coating method, A knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, etc. are applied to a coating composition layer, such as a resin layer, on the surface of the light-transmitting substrate 101a.

The microparticles 101b2 may be, for example, aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), zinc oxide (ZnO), yttrium oxide (Y ₂ O ₃ ), yttrium aluminum garnet Nano particles made of stone (Y ₃ A ₁₅ O ₁₂ , YAG), calcium carbonate (CaCO ₃ ), barium sulfate (BaSO ₄ ), zirconium dioxide (ZrO ₂ ), or any combination thereof. In some embodiments of the present invention, the shape of the microparticles 101b2 is not particularly limited, and may be any one or a combination of a spherical shape, a slightly spherical shape, a needle shape, a polygonal shape, and an ellipsoid. The preferred size range of the microparticles 101b2 is that the average particle diameter is substantially between 0.1 micrometer and 10 micrometers.

Referring to FIG. 1, the first polarizing plate 104 may be an optical film that allows only light having a single polarization direction to pass through. For example, in some embodiments of the present invention, the first polarizing plate 104 may be a composite plasticized material layer. It may include a first substrate layer 104a, a second substrate layer 104b, and a polarizing layer 104c sandwiched between the first substrate layer 104a and the second substrate layer 104b.

Among them, the polarizing layer 104c is composed of an isotropic polyvinyl alcohol (Poly-Vinyl Alcohol (PVA)). The electric field component passes through to achieve the effect of polarized light. The materials constituting the first substrate layer 104a and the second substrate layer 104b may be the same or different; and the materials constituting the first substrate layer 104a and the second substrate layer 104b may be selected from the group consisting of Triacetate Cellulose (TAC), Polymethylmethacrylate, PMMA), Polyethylene Terephthalate (PET), Polypropylene (PP), Cyclo Olefin Polymer (COP), Polycarbonate (PC), and any of the above A group of groups.

In addition, in one embodiment, a side of the first polarizing plate 104 facing the optical film 101 further includes another surface treatment layer 105. In some embodiments of the present invention, the material and manufacturing method of the surface treatment layer 105 may be the same as those of the surface treatment layer 101b. However, in other embodiments of the present invention, the material and manufacturing method of the surface treatment layer 105 are not limited thereto. Any optical film layer or surface profile that can cause the first polarizing plate 104 (generally external haze is about 0.1%) to produce a first external haze that is substantially between 0.1% and 30% does not exceed the present invention The spiritual scope.

However, it is worth noting that, in the embodiment of the present invention, the first outer haze of the first polarizing plate 104 and the second outer haze range of the optical film 101 are limited. Preferably, the sum of the first external haze and the second external haze is substantially between 12% and 40%; and the absolute difference between the first external haze and the second external haze is preferably less than substantially twenty four%. By attaching the optical film structure 100 to the touch display device 10, it is possible to eliminate the phenomenon that the Newton ring influences the screen display effect generated by the touch display device.

Please refer to FIG. 3. FIG. 3 is a schematic cross-sectional view showing a structure of a touch display device 10 manufactured by applying the optical film structure 100 of FIG. 1 according to an embodiment of the present invention. The touch display device 10 includes a display module 200, a touch module 210, and an optical film 101, an air gap 102, The optical film structure 100 of the plastic frame 103, the first polarizing plate 104 and the surface treatment layer 105.

The display module 200 includes a display medium 201 and a second polarizing plate 202, and the display medium 201 has a light emitting surface 201a and a light incident surface 201b on the opposite side of the light emitting surface 201a. In some embodiments of the present invention, the display medium 201 may be a liquid crystal molecular layer, an organic light-emitting diode (OLED), an electronic ink (E-Ink) layer, or other flat display. medium.

The second polarizing plate 202 faces the light incident surface 201 b of the display medium 201. In other words, the second polarizing plate 202 and the first polarizing plate 104 are located on opposite sides of the display medium 201, respectively. In addition, the second polarizing plate 202 is also an optical film that allows only light having a single polarization direction to pass through, and can achieve a polarization effect. In some embodiments of the present invention, the material of the second polarizing plate 202 may be the same as or different from that of the first polarizing plate 104. It is worth noting that the polarization direction of the light passing through the second polarizing plate 202 must be orthogonal to the polarization direction of the light passing through the first polarizing plate 104.

The touch module 210 may be a resistive touch module, a capacitive touch module, an optical touch module, or a surface acoustic wave touch module. The substrate (not shown) of the touch module 210 faces the light emitting surface 201 a of the display medium 201. The optical film structure 100 is located between the display module 200 and the touch module 210, and the first polarizing plate 104 side of the optical film structure 100 is the light emitting surface 201a of the display medium 201. The transparent substrate 101 a in the optical film structure 100 is bonded to the touch module 210 through an adhesive layer 203.

By adjusting the thickness H of the air gap 102 between the optical film 101 and the first polarizing plate 104, the combination of the first outer haze and the second outer haze in a specific range has a multiplier effect on eliminating the phenomenon of Newton. For example, in some embodiments, when the thickness of the air gap 102 is substantially between 100 micrometers and 200 micrometers, and the total external haze of the optical film sheet 101 and the first polarizing plate 104 is 12% to 24% Still, a slight degree of Newton's rings appeared. In other embodiments, when the external haze of the optical film 101 and the first polarizing plate 104 totals more than 24%, and the air gap 102 with a thickness of substantially less than 100 microns is added, the Newton ring phenomenon can be obtained. Effectively suppressed. In still other embodiments, when the thickness of the air gap 102 is substantially between 200 micrometers and 300 micrometers, and the total external haze of the optical film sheet 101 and the first polarizing plate 104 is more than 12%, it is more effective. Prevent or suppress the generation of Newton's rings.

In order to more clearly illustrate and verify the effect of the first outer haze, the second outer haze, and the thickness H of the air gap 102 on the elimination of Newtonian phenomena, a first polarizing plate 104 having a first outer haze substantially greater than 1% is used below The optical film structure 100 composed of the second optical film 101 with the outer haze substantially greater than 24%, and the touch display device 10 assembled with the display module 200 and the touch module 210 as an embodiment, in combination with different gases. The thickness H of the gap 102 is adjusted for observation. The combined items and observation results of the embodiment are shown in Table 1: Among them, ◎ represents completely Newton-free ring.

At the same time, it uses the combination of other first external haze (essentially less than 1% or less than 12%) and second external haze (essentially less than 1% or less than 12%), and the same display module 200 and touch module 210 The assembled touch display device is used as a comparative example to observe the thickness H of different air gaps 102. The combined items and observation results of the comparative example are shown in Tables 2, 3, and 4 :.

Among them, △ represents a medium degree of Newton's ring and × represents a severe degree of Newton's ring.

○ represents a slight degree of Newton's ring, △ represents a medium degree of Newton's ring, and × represents a severe degree of Newton's ring.

◎ represents completely Newton-free ring, ○ represents slight degree of Newton's ring, △ represents medium degree of Newton's ring.

Comparing the above observation results, it can be known that under the conditions that the first and second external hazes are greater than 24% and the air gap thickness H is between 100 μm and 300 μm, When a touch panel (module) of the touch display device 10 is pressed with a finger or a stylus pen, no Newton ring phenomenon is generated (see Embodiments 1 to 3).

On the contrary, under the condition that the total of the first external haze and the second external haze is less than 24%, and the air gap thickness H is between 100 μm and 300 μm, When a finger or a stylus is pressed on a touch panel (module) of a touch display device, a Newton ring phenomenon of different degrees still occurs (see Comparative Example 1 to Comparative Example 11). And as the total value of the first outer haze and the second outer haze and the air gap thickness H decrease, the Newton's ring phenomenon has a more serious tendency.

Although, when the air gap thickness H is controlled to be substantially 300 micrometers or more, the Newtonian ring can be completely eliminated even when the total of the first outer haze and the second outer haze is less than 24% (see Comparative Example 12). The phenomenon. However, in this case, the thickness of the optical film structure 101 must be increased, which is not conducive to the thinning requirement of the touch display device 10. Therefore, it can be known that the embodiments provided in this case have the technical advantages of eliminating the phenomenon of Newton's ring and simultaneously taking into account the thinning requirements of the touch display device 10.

According to the above, the embodiments of the present invention provide an optical film structure and a touch display device using the optical film structure. The optical film structure includes a polarizing plate and an optical film having a specific relationship of a specific external haze. The thickness of the air gap between the two is adjusted to eliminate the occurrence of the touch display device when it is pressed. The optical interference halo image is used to increase the visibility of the viewer's browsing screen, and to solve the phenomenon that the Newton ring affects the screen display effect in the conventional technology.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. The process steps and structures described herein do not cover the complete manufacturing process for making integrated integrated circuits. The present invention can be implemented in combination with many different integrated circuit fabrication technologies that are currently known or developed in the future. Those with ordinary knowledge in the technical field to which the present invention pertains may make various modifications without departing from the spirit and scope of the present invention. Changes and retouching. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

100‧‧‧Optical diaphragm structure

101‧‧‧Optical diaphragm

101a‧‧‧Transparent substrate

101b‧‧‧Surface treatment layer

101b1‧‧‧Transparent coating

101b2‧‧‧fine particles

102‧‧‧Air gap

103‧‧‧plastic frame

104‧‧‧first polarizing plate

104a‧‧‧First substrate layer

104b‧‧‧Second substrate layer

104c‧‧‧polarizing layer

105‧‧‧Surface treatment layer

H‧‧‧thickness of air gap

h‧‧‧ thickness of surface treatment layer

S‧‧‧Thickness of transparent substrate

Claims (11)

An optical film structure includes: a first polarizing plate having a first outer haze; and an optical film having a second outer haze, attached to the first polarizing plate, and There is an air gap between the optical film and the first polarizing plate; wherein the air gap has a thickness substantially between 100 micrometers (μm) and 300 micrometers, and the first external mist The sum of the degree and the second external haze is substantially between 12% and 40%. According to the optical film structure described in item 1 of the scope of patent application, wherein the sum of the first external haze and the second external haze is substantially between 24% and 40%. The optical film structure according to item 1 of the scope of patent application, wherein the air gap has a thickness substantially between 100 micrometers and 200 micrometers, and the sum of the first outer haze and the second outer haze is substantially Between 24% and 30%. An optical film structure includes: a first polarizing plate having a first external haze; and an optical film having a second external haze attached to the first polarizing plate And there is an air gap between the optical film and the first polarizing plate; wherein the air gap has a thickness substantially between 100 microns and 200 microns, and the first outer haze and the second outer The sum of the haze sum is substantially between 24% and 30% or the air gap has a thickness substantially between 200 and 300 microns, and the first outer haze and the second outer haze are added together And the actual haze is more than 12%. The optical film structure according to item 1 or 4 of the scope of the patent application, wherein the optical film comprises an anti-split (AS) film, and the material constituting the anti-split film is selected from polymethacrylic acid Polymethylmethacrylate (PMMA), Triacetyl Cellulose (TAC), Polyester (Polyethylene Terephthalate, PET), Polypropylene (PP), Cyclo Olefin Polymer (COP), Polymer A group of carbonates (Polycarbonate, PC) and any combination of the above. The optical film structure according to item 1 or item 4 of the patent application scope, wherein the optical film has a thickness substantially between 20 micrometers and 120 micrometers. The optical film structure according to item 1 or 4 of the scope of patent application, wherein the optical film includes a surface treatment layer having a thickness of substantially 100 nm a thickness between (nm) and 20 microns and a roughness (Ra) between substantially 0.05 and 0.5 microns. The optical film structure according to item 4 of the scope of patent application, wherein the optical film includes a surface treatment layer, and the surface treatment layer includes: a light-transmitting coating applied on the optical film to face the first A surface of the polarizing plate; and a plurality of particles are distributed in the light-transmitting coating. According to the optical film structure described in the first or fourth item of the patent application scope, the optical film structure further includes a frame adhesive layer located between the optical film and the first polarizing plate, wherein the air gap is located in the frame adhesive layer. in. According to the optical film structure described in item 1 or 4 of the scope of patent application, wherein the first external haze is substantially between 0.1% and 30%; the second external haze is substantially between 0.1% and 30 %; Wherein an absolute difference between the first outer haze and the second outer haze is substantially less than 24%. A touch display device includes: a display module having a light emitting surface; a touch module facing the light emitting surface; and the one described in one of the first to tenth of the scope of patent application The optical film structure is located between the display module and the touch module; wherein the first polarizing plate faces the light emitting surface.