TWI718007B - Optical film and display - Google Patents

Abstract

An optical film including a transparent substrate, a plurality of particles and a transparent layer is provided. The transparent substrate has a plurality of protrusion structures on a first surface thereof. The particles are disposed above the first surface, and an orthogonal projection of a geometric center of each of the particles does not overlap with a highest point of each of the protrusion structures. The transparent layer is disposed on the first surface to cover the protrusion structures and the particles. In addition, a display having the optical film is also provided.

Description

Optical film and display device

The invention relates to an optical film and a display device, and more particularly to an optical film and a display device with anti-glare function.

With the development of flat display technology, various electronic products with display functions such as flat-screen TVs, notebook computers, tablet computers, and smart phones have been popular in the consumer market for a long time. In order to prevent the ambient light from being reflected by the display surface of these products to produce glare and reduce their viewing quality in a high-brightness environment, the display surface is generally treated with anti-glare (AG).

Specifically, the anti-glare treatment is to form a concave-convex microstructure on the optical film on the display interface to increase its haze, so that the degree of glare generated after the ambient light is reflected at the optical film is reduced. However, the uneven microstructures distributed in an irregular manner may form many embracing structures, and part of the dirt attached to the optical film will be confined in the embracing structures and difficult to be removed.

The invention provides an optical film, the dirt on the surface of which is easy to remove.

The invention provides a display device whose dirt on the surface of an optical film is easy to remove.

The optical film of the present invention includes a transparent substrate, a plurality of particles and a transparent layer. A first surface of the transparent substrate has a plurality of convex structures. The particles are arranged above the first surface, and the orthographic projection of the geometric center of each particle on the transparent substrate does not overlap the highest point of each convex structure. The light-transmitting layer is disposed on the first surface to cover the convex structures and the particles.

In an embodiment of the present invention, the refractive index of the light-transmitting layer, the refractive index of the light-transmitting substrate, and the refractive index of these particles are between 1.3 and 1.9.

In an embodiment of the present invention, the refractive index of the above-mentioned transparent layer is not equal to the refractive index of the transparent substrate or the refractive index of these particles.

In an embodiment of the present invention, the above-mentioned light-transmitting layer has a second surface and a third surface opposite to each other. The second surface is joined to the first surface and these convex structures, and the third surface changes with the distribution of these particles. Rugged relative to the first surface.

In an embodiment of the present invention, the minimum distance between the third surface and the first surface is H1, the maximum distance between the third surface and the first surface is H2, and the difference between H2 and H1 is greater than or equal to 2.4 microns .

In an embodiment of the present invention, the maximum height of the above-mentioned convex structures relative to the first surface is Hg, the minimum distance between the convex structures and the third surface is Ha, and the average particle size of these particles is D, ( Ha + Hg)/D is greater than or equal to 0.5.

In an embodiment of the present invention, the average pitch of the above-mentioned convex structures is P, the average particle size of these particles is D, and P is greater than D.

In an embodiment of the present invention, the average pitch of the aforementioned convex structures is P, the average particle size of these particles is D, and D/P is greater than or equal to 0.33 and less than or equal to 0.4138.

In an embodiment of the present invention, the volume concentration of the aforementioned particles in the transparent layer is greater than or equal to 20%.

In an embodiment of the present invention, the above-mentioned convex structures do not intersect each other.

In an embodiment of the present invention, the above-mentioned convex structures are parallel to each other.

In an embodiment of the present invention, each of the above-mentioned convex structures is a straight structure.

In an embodiment of the present invention, the above-mentioned convex structures are arranged at intervals along a first direction.

In an embodiment of the present invention, the aforementioned at least one convex structure has a plurality of disconnected portions, and the disconnected portions divide the at least one convex structure into a plurality of sections, and the sections are along a first direction perpendicular to the first direction. Arranged at intervals in two directions.

In an embodiment of the present invention, the width of each of the above-mentioned broken portions along the second direction is W1, the average particle size of these particles is D, and W1 is less than 0.25*D.

In an embodiment of the present invention, the aforementioned light-transmitting substrate has a plurality of microstructures on the first surface, the maximum width of each microstructure is Wm, the average particle size of these particles is D, and Wm is smaller than D.

In an embodiment of the present invention, the above-mentioned convex structures are arranged equidistantly.

In an embodiment of the present invention, the above-mentioned convex structures are arranged at unequal distances.

In an embodiment of the present invention, the above-mentioned at least one convex structure has a concave portion, and at least one particle is located above the concave portion.

The display device of the present invention includes a display device main body and an optical film. The main body of the display device has a display interface. The optical film is disposed on the display interface and includes a transparent substrate, a plurality of particles, and a transparent layer. A first surface of the transparent substrate has a plurality of convex structures. The particles are arranged above the first surface, and the orthographic projection of the geometric center of each particle on the transparent substrate does not overlap the highest point of each convex structure. The light-transmitting layer is disposed on the first surface to cover the convex structures and the particles.

Based on the above, in the optical film of the present invention, the geometric center of these particles deviates from the highest point of the convex structures on the light-transmitting substrate, that is, the light-transmitting substrate treats these particles through these convex structures. Separation, so that these particles are not distributed completely randomly, but distributed regularly to a certain extent. In this way, the probability of these particles and the light-transmitting layer covering them forming an enveloping structure can be reduced, and part of the dirt on the optical film is prevented from being confined to the enveloping structure and difficult to be removed.

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. Please refer to FIG. 1, the display device 10 of this embodiment includes a display device main body 12 and an optical film 100. The display device main body 12 can be various electronic products with display functions, such as a flat-screen TV, a notebook computer, a tablet computer, and a smart phone, which is not limited in the present invention. The optical film 100 is disposed on the display interface 12 a of the display device main body 12, and the display interface 12 a is, for example, the surface of the display panel of the display device main body 12.

Fig. 2 is a partial cross-sectional view of the optical film of Fig. 1. 3 is a perspective view of a partial structure of the optical film of FIG. 2. 2 and 3, the optical film 100 of this embodiment includes a light-transmitting substrate 110, a plurality of particles 120, and a light-transmitting layer 130. The material of the light-transmitting substrate 110 is, for example, resin or other suitable materials with light-transmitting properties. A first surface 110 a of the light-transmitting substrate 110 has a plurality of convex structures 112. The material of these particles is, for example, resin, silicon dioxide, aluminum oxide or other suitable materials, and they are disposed on the first surface 110a of the transparent substrate 110. The material of the light-transmitting layer 130 is, for example, resin or other suitable light-transmitting materials, which are disposed on the first surface 110 a of the light-transmitting substrate 110 to cover the convex structures 112 and the particles 120.

Specifically, the light-transmitting layer 130 has a second surface 130a and a third surface 130b opposite to each other. The second surface 130a of the light-transmitting layer 130 is bonded to the first surface 110a of the light-transmitting substrate 110 and the convex structures 112, and the third surface 130b of the light-transmitting layer 130 is relative to the light-transmitting substrate with the distribution of the particles 120. The first surface 110a of the material 110 undulates. With the arrangement of the convex structures 112 and the particles 120, the internal haze of the optical film 100 can be increased, and the undulation of the light-transmitting layer 130 can increase the external haze of the optical film 100, so that the ambient light The degree of glare generated after being reflected at the optical film 100 is reduced. In this embodiment, the refractive index of the transparent layer 130, the refractive index of the transparent substrate 110, and the refractive index of the particles 120 are, for example, between 1.3 and 1.9, and the refractive index of the transparent layer 130 is not equal to the transparent, for example. The refractive index of the optical substrate 110 may not be equal to the refractive index of these particles 120. The present invention does not impose restrictions on the refractive index of the transparent layer 130, the transparent substrate 110, and the particles 120.

As shown in FIG. 2, in this embodiment, the orthographic projection of the geometric center C of each particle 120 on the transparent substrate 110 does not overlap with the highest point A of each convex structure 112. The highest point A means the point on the convex structure 112 that is farthest from the first surface 110a. That is, the light-transmitting substrate 110 separates the particles 120 by the convex structures 112, so that the particles 120 are not distributed completely randomly, but distributed regularly to a certain extent. In this way, the probability that the particles 120 and the light-transmitting layer 130 covering them form an enveloping structure can be reduced, and part of the dirt on the optical film 100 is prevented from being confined in the enveloping structure and difficult to be removed.

In detail, as shown in FIG. 3, the convex structures 112 of the present embodiment are straight strip-shaped structures arranged at intervals along a first direction D1, which are parallel to each other and do not intersect each other. That is, each convex structure 112 extends on the first surface 110a of the transparent substrate 110 in a one-dimensional manner. In the process of manufacturing the optical film 100, for example, the particles 120 are first poured on the first surface 110a of the light-transmitting substrate 110. The particles 120 will be concentrated on the convexities due to gravity and the guidance of the convex structures 112. The low place between the structures 112 makes the orthographic projection of the geometric center C of each particle 120 on the transparent substrate 110 not overlap with the highest point A of each convex structure 112 as described above. Next, pour a solvent (the glue for curing into the light-transmitting layer 130) on the first surface 110a of the light-transmitting substrate 110, so that the solvent covers the convex structures 112 and the particles 120, and the solvent is cured to become the light-transmitting layer 130.

In the optical film 100 manufactured in this way, the undulating distribution of the outer surface (that is, the third surface 130b shown in FIG. 2) roughly corresponds to the distribution of the particles 120, which is separated by the convex structures 112 They are roughly distributed in a one-dimensional manner, which reduces the probability of forming an enveloping structure as described above. Thereby, when the user wipes the outer surface of the optical film 100 (that is, the third surface 130b shown in FIG. 2), the structure on the outer surface will not move in a second direction D2 perpendicular to the first direction D1. (Marked in Figure 3) to contact or block the dirt, and the wiping cloth and the dirt are easier to contact the dirt in the second direction D2, thereby reducing the adhesion of the dirt and the outer surface and increasing the dirt and the wiping cloth The adhesion.

Please refer to FIG. 2, in this embodiment, the minimum distance between the third surface 130b of the transparent layer 130 and the first surface 110a of the transparent substrate 110 is H1, and the third surface 130b of the transparent layer 130 is The maximum distance between the first surfaces 110a of the optical substrate 110 is H2. The difference ΔH between H2 and H1 is, for example, greater than or equal to 2.4 μm, so that the third surface 130 b of the transparent layer 130 has sufficient undulations to provide sufficient external haze of the optical film 100.

In this embodiment, the maximum height of the convex structures 112 relative to the first surface 110a of the transparent substrate 110 is Hg, the minimum distance between the convex structures 112 and the third surface is Ha, and the average particle size of the particles 120 The diameter is D. In the process of manufacturing the optical film 100, by providing an appropriate amount of solvent (the glue used to cure the light-transmitting layer 130) so that (Ha + Hg)/D is greater than or equal to 0.5, the particles 120 can be avoided The amount of solvent is too small and falls off.

In this embodiment, the average pitch of the convex structures 112 is P. P is greater than the average particle size D of the particles 120, so that the particles 120 can be smoothly concentrated in the low places between the convex structures 112. In addition, the average particle size D and number of these particles 120 are related to whether they can provide sufficient haze. For example, D/P is greater than or equal to 0.33 and less than or equal to 0.4138, and the volume concentration of these particles 120 in the light-transmitting layer 130 is, for example, greater than or equal to 20%, so as to provide sufficient haze of the optical film 100.

As shown in FIG. 2, the transparent substrate 110 may further have a plurality of microstructures 114 on the first surface 110 a to further increase the internal haze of the optical film 100. The maximum width of each microstructure 114 is Wm, and Wm is, for example, smaller than the average particle diameter D of these particles. In other embodiments, the light-transmitting substrate 110 may not have the microstructure 114 on the first surface 110a, which is not limited in the present invention.

In the embodiment shown in FIG. 2 and FIG. 3, the convex structures 112 are arranged equidistantly, but the present invention is not limited thereto. The following illustrates this with a diagram. 4 is a schematic cross-sectional view of a partial structure of an optical film according to another embodiment of the present invention. The difference between the embodiment shown in FIG. 4 and the embodiment shown in FIG. 2 is that one pitch P'of the convex structures 112 is different from other pitches P of the convex structures 112, that is, the convex structures 112 are arranged at unequal distances.

FIG. 5 is a schematic cross-sectional view of a partial structure of an optical film according to another embodiment of the present invention. The difference between the embodiment shown in FIG. 5 and the embodiment shown in FIG. 4 is that the two adjacent convex structures 112 in FIG. 5 are closer to each other and can be collectively regarded as a convex structure, and the top of the convex structure has a concave portion 112a, part of the particles 120 may be located above the recess 112a.

Fig. 6 is a perspective view of a part of the structure of an optical film according to another embodiment of the present invention. The difference between the embodiment shown in FIG. 6 and the previous embodiments is that the convex structure 112 of FIG. 6 has a plurality of disconnected portions 1121. These disconnected portions 1121 divide the convex structure 112 into a plurality of sections 1122, and these sections 1122 They are arranged at intervals along a second direction D2 perpendicular to the first direction D1. Furthermore, the width of each disconnected portion 1121 along the second direction D2 is W1, the average particle diameter of these particles is D (as indicated in FIG. 2), and W1 is, for example, less than 0.25*D. In other embodiments, other types of convex structures may be formed on the light-transmitting substrate 110, and the present invention is not limited thereto.

In summary, in the optical film of the present invention, the geometric center of these particles deviates from the highest point of the convex structures on the light-transmitting substrate, that is, the light-transmitting substrate resists these particles through these convex structures. The separation is carried out so that these particles are not distributed completely randomly, but distributed regularly to a certain extent. For example, these particles can be divided into approximately one-dimensional distribution by a convex structure extending in a one-dimensional manner. In this way, the probability of these particles and the light-transmitting layer covering them forming an enveloping structure can be reduced, and part of the dirt on the optical film is prevented from being confined to the enveloping structure and difficult to be removed.

10: Display device

12: Display device body

12a: Display interface

100: Optical film

110: Transparent substrate

110a: first surface

112: convex structure

1121: Disconnect

1122: section

112a: Depressed part

114: Microstructure

120: Particle

130: light transmitting layer

130a: second surface

130b: third surface

A: The highest point

C: geometric center

D: particle size

D1: First direction

D2: second direction

H1, H2, Ha: distance

Hg: height

P, P’: spacing

W1, Wm: width

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. Fig. 2 is a partial cross-sectional view of the optical film of Fig. 1. 3 is a perspective view of a partial structure of the optical film of FIG. 2. 4 is a schematic cross-sectional view of a partial structure of an optical film according to another embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a partial structure of an optical film according to another embodiment of the present invention. Fig. 6 is a perspective view of a part of the structure of an optical film according to another embodiment of the present invention.

100: Optical film

110: Transparent substrate

110a: first surface

112: convex structure

114: Microstructure

120: Particle

130: light transmitting layer

130a: second surface

130b: third surface

A: The highest point

C: geometric center

D: particle size

D1: First direction

H1, H2, Ha: distance

Hg: height

P: pitch

Wm: width

Claims (19)

An optical film comprising: a light-transmitting substrate, a first surface of the light-transmitting substrate has a plurality of convex structures; a plurality of particles are arranged above the first surface, wherein the geometric center of each particle is The orthographic projection on the transparent substrate does not overlap the highest point of each of the convex structures; and a transparent layer is disposed on the first surface to cover the convex structures and the particles, wherein the transparent substrate There are a plurality of microstructures on the first surface, the maximum width of each microstructure is Wm, the average particle size of the particles is D, and Wm is smaller than D. The optical film according to claim 1, wherein the refractive index of the light-transmitting layer, the refractive index of the light-transmitting substrate, and the refractive index of the particles are between 1.3 and 1.9. The optical film according to claim 1, wherein the refractive index of the light-transmitting layer is not equal to the refractive index of the light-transmitting substrate or the refractive index of the particles. The optical film according to claim 1, wherein the light-transmitting layer has a second surface and a third surface opposite to each other, the second surface is joined to the first surface and the convex structures, and the third surface follows The distribution of the particles fluctuates relative to the first surface. The optical film according to claim 4, wherein the minimum distance between the third surface and the first surface is H1, and the maximum distance between the third surface and the first surface is H2, which is greater than H2 and H1 The difference is 2.4 microns or more. The optical film according to claim 4, wherein the maximum height of the convex structures relative to the first surface is Hg, the minimum distance between the convex structures and the third surface is Ha, and the average of the particles The particle size is D, and (Ha+Hg)/D is greater than or equal to 0.5. The optical film according to claim 1, wherein the average pitch of the convex structures is P, the average particle size of the particles is D, and P is greater than D. The optical film according to claim 1, wherein the average pitch of the convex structures is P, the average particle size of the particles is D, and D/P is greater than or equal to 0.33 and less than or equal to 0.4138. The optical film according to claim 1, wherein the volume concentration of the particles in the light-transmitting layer is greater than or equal to 20%. The optical film according to claim 1, wherein the convex structures do not intersect each other. The optical film according to claim 1, wherein the convex structures are parallel to each other. The optical film according to claim 1, wherein each of the convex structures is a straight structure. The optical film according to claim 1, wherein the convex structures are arranged at intervals along a first direction. The optical film according to claim 13, wherein at least one of the convex structures has a plurality of disconnected portions, and the disconnected portions divide the at least one convex structure into a plurality of sections, and the sections are perpendicular to the The first direction and the second direction are arranged at intervals. The optical film according to claim 14, wherein the width of each of the broken portions along the second direction is W1, the average particle size of the particles is D, and W1 is less than 0.25*D. The optical film according to claim 1, wherein the convex structures are arranged equidistantly. The optical film according to claim 1, wherein the convex structures are arranged at unequal distances. The optical film according to claim 1, wherein at least one of the convex structures has a concave portion, and at least one particle is located above the concave portion. A display device includes: a display device main body having a display interface; and an optical film disposed on the display interface and including: a light-transmitting substrate, and a first surface of the light-transmitting substrate has a A convex structure; a plurality of particles arranged above the first surface, wherein the orthographic projection of the geometric center of each particle on the transparent substrate does not overlap the highest point of each convex structure; and a transparent layer, Is arranged on the first surface to cover the convex structures and the particles, wherein the light-transmitting substrate has a plurality of microstructures on the first surface, the maximum width of each microstructure is Wm, and the particles The average particle size is D, and Wm is smaller than D.

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