KR101121648B1 - Optical Sheet - Google Patents

Abstract

The present invention relates to an optical thin plate comprising one body and one structural surface layer, wherein the body comprises one plane, one base and a top. The structure surface layer includes a plurality of concave structures adjacent to each other, the concave structures are provided in the plane, and all the concave structures have at least two first curved surfaces and at least two second curved surfaces. The second curved surface extends to the base. The first curved surface of the first concave structure different from the first curved surface is connected at the top portion to form one first arc surface, and the second curved surface of the second curved surface and the other adjacent concave structure is different from each other at the top portion. Connected to form a second arc surface. Through this, the optical thin plate of the present invention can have a maximum diffusion effect and can prevent damage to the brightness enhancement film and other optical films.

Surface layer, concave structure, curved surface, arc surface, foundation part, top part

Description

Optical Sheet {Optical Sheet}

The present invention relates to an optical thin plate, and more particularly, to an optical thin plate having a plurality of concave structures.

At present, with the rapid development of technology related to liquid crystal display, not only the price of liquid crystal display has been lowered, but also the quality of the display is catching up with the traditional CRT display. Typically, a liquid crystal display includes a backlight module and a liquid crystal panel (LCD panel), the backlight module provides a light beam for displaying the screen, the liquid crystal panel light beam in a manner that changes the arrangement of the internal liquid crystal Controls whether or not passes. 1 is a view showing various components of a liquid crystal display currently sold. Referring to FIG. 1, the liquid crystal display 1 includes one backlight module 11 and one liquid crystal panel 12, and the backlight module 11 includes one reflective cover 111 and a plurality of light sources. (112), one diffuser plate and one luminance enhancement film (114), wherein the light source (112) is installed inside the reflector cover (111), and the diffuser plate (113) is a light source (112) firing The light beam is diffused, and the brightness enhancement film 114 is condensing.

The main constituent material of the diffuser plate 113 is a transparent material such as poly methyl methacrylate, polycarbonate, or polyethylene terephthalate, and a plurality of light inside the diffuser plate 113. The diffusing particles are dispersed (not shown in the figure), and the refractive indexes of the light diffusing particles and the refractive indexes of the main constituent materials of the diffusing plate 113 are different from each other. As it passes through, the path of the light beam will deviate and change, resulting in the light beam spreading.

When a liquid crystal display is used as a television in a room, it must be clearly visible to the user at the front of the display (e.g., position A) while clearly visible to the user at the side of the display (e.g., position B). This means that the angle of light diffusion must be large enough. Conversely, when the liquid crystal display is placed in an office and used as a monitor of a computer, the diffusion angle may be relatively small enough that only a person located in front of the display (e.g., position A) can be clearly seen. However, since the diffusion method inside the diffusion plate 113 of the light diffusion particles is irregular, it is impossible to accurately control the diffusion angle of the light beam.

Therefore, how to accurately control the angle of light rays is a problem for those skilled in the art to consider. US Patent US7320538 discloses the optical thin plate 2 shown in FIG. The optical thin plate 2 includes one main layer 22 and one structural surface layer 21, and the structural surface layer 21 is provided above the main layer 22 through the adhesive layer 29. . The structure surface layer 21 is provided with a plurality of concave structures 24, and all the concave structures 24 include two first surfaces 24A and two second surfaces 24B; When light rays pass through the first surface 24A and the second surface 24B, one angle of incidence is generated, resulting in refraction and total reflection. The optical thin plate 2 of US Pat. No. 7,373,383 changes the angle of diffusion of light rays passing through the concave structure 24 through two first surfaces 24A and two second surfaces 24B.

However, the optical thin plate 2 has a large drawback. The first surface 24A is in one plane and the rays emitted after the light passes through the first surface 24A are parallel to each other, which cannot exhibit the maximum diffusing effect. For the same reason, the second surface 24B may not exhibit the maximum diffusion effect. If the brightness of the liquid crystal display screen is not uniform, the consumer's desire to purchase is lowered, and the adjacent contact portions 244 between the concave structures 24 adjacent to each other become acute, and thus the luminance shown in FIG. Scratches are likely to occur when the enhancement film 114 or other types of optical films are placed here.

Therefore, it is a goal of those skilled in the art to increase the brightness uniformity of the optical thin plate and to lower the probability of scratching other optical films.

The main object of the present invention can achieve the effect of sufficiently mixing the light rays in addition to controlling the angle of diffusion of the light rays by providing the optical thin plate.

In order to achieve the above object, the present invention provides an optical thin plate for adjusting and controlling the angle of diffusion of the light beam, the optical thin plate includes one main body and one structural surface layer. Here, the body includes one plane, one base and one top portion, and the plane, the base and the top portion do not cross each other. The structure surface layer includes a plurality of concave structures adjacent to each other, the concave structures being provided in the plane, and all the concave structures are at least two opposing first curved surfaces facing each other and at least two facing each other. A curved surface is provided, wherein the first curved surface extends to the base portion, and the second curved surface also extends to the base portion. The first curved surface of the adjacent concave structure different from the first curved surface is connected at the top portion to form a first arc surface, and the second curved surface and the second curved surface of the other adjacent concave structure are connected to each other at the top portion One second arc surface is formed. Through this, the optical thin plate of the present invention can achieve the maximum diffusion effect, can have the maximum brightness uniformity, and can prevent the brightness enhancement film or other optical film from being scratched.

In the optical thin plate, the perimeters of the tops of all the concave structures form one trapezoid, rectangle, rhombus or square shape.

In the optical thin plate, the base portion is one dot, planar or arcuate.

In the optical thin plate, the optical thin plate further includes a main layer and a base layer, the main layer is below the structural surface layer, a plurality of light diffusing particles are distributed in the main layer, The refractive index and the refractive index of the main layer are different. The base layer is below the main layer, and the base layer includes an ultraviolet absorber.

In the optical thin plate, the two first curved surfaces are symmetrical to each other by the base portion.

In the optical thin plate, two second curved surfaces are symmetrical to each other by the base portion.

In order to achieve the above object, the present invention provides another optical thin plate for adjusting and controlling the angle of diffusion of the light beam, wherein the optical thin plate includes one main body and one structural surface layer. Here, the body includes one plane and one top portion. The structure surface layer includes a plurality of adjacent concave structures, the concave structures are provided in the plane, and all the concave structures include one first curved surface and at least two second curved surfaces facing each other. The first curved surface extends downward and is adjacent to the second curved surface. The first curved surface and the first curved surface of the other adjacent concave structure are connected to each other at the top portion to form one first arc surface, and the second curved surface and the second curved surface of the other adjacent concave structure are at the top portion It is connected to each other to form one second arc surface. Through this, the optical thin plate of the present invention can achieve an optimal diffusion effect, obtain high luminance uniformity, and prevent the luminance enhancing film or other optical film from being scratched.

In the optical sheet, the perimeters of the tops of all the concave structures form one trapezoid, rectangle, rhombus or square.

In the optical thin plate, the optical thin plate further comprises a main layer and a base layer, the main layer is located below the structural surface layer, a plurality of light diffusion particles are dispersed inside the main layer, the light The refractive index of the diffusion particles and the refractive index of the main layer are different from each other. The base layer is below the main layer, and the base layer includes an ultraviolet absorber.

In the optical sheet, two second curved surfaces are symmetrical to each other by the first curved surface.

Here, in the optical thin plate of the present invention, since the first curved surface and the second curved surface are both curved surfaces, the inclinations of the tangents of all the points are different from each other, so that their light paths are no longer after the light rays parallel to each other pass through the first surface. Do not keep parallel. Thus, the optical thin plate of the present invention can achieve the effect that the passed light rays are sufficiently mixed.

BRIEF DESCRIPTION OF THE DRAWINGS In order that those skilled in the art will more readily appreciate the above objects, features and advantages of the present invention, the embodiments will be described in detail with reference to the drawings.

According to the present invention, it is possible to increase the luminance uniformity of the optical thin plate and to lower the probability of scratching other optical films.

3 shows a cross-sectional view of the optical thin plate of the first embodiment according to the present invention. Referring to FIG. 3, the optical thin plate 3 is used to adjust and control the angle of diffusion of the light rays, which includes one structural surface layer 31, a main layer 32, and a base layer 33. As shown in FIG. Here, the main layer 32 is below the structural surface layer 31, and a plurality of light diffusing particles (not shown) are dispersed in the main layer 32, and the refractive index of the light diffusing particles The refractive indexes of the main layer 32 and the main layer 32 are different from each other. Accordingly, when the light ray passes through the interface between the main layer 32 and the light diffusing particles, the direction is broken and scattered to achieve the effect of diffusing the light beam. The base layer 33 is below the bottom of the main layer, the base layer 33 includes an ultraviolet absorber, and thus the base layer 33 has a function of absorbing ultraviolet light, May slow aging. In addition, those skilled in the art may consider adding an appropriate amount of ultraviolet absorber to the structural surface layer.

FIG. 4 is a view showing the structure surface layer of the first embodiment according to the present invention, and FIG. 5 is a view showing two adjacent concave structures of the first embodiment according to the present invention, referring to FIGS. 4 and 5 simultaneously. The upper part of the optical thin plate 3 of FIG. 3 is composed of the structural surface layer 31 and one main body 35, the main body 35 having one plane 354, one foundation 355 and a top. A portion 353, and the plane 354, the foundation 355, and the top portion 353 do not intersect each other. The structural surface layer 31 includes a plurality of concave structures 34 adjacent to each other, and the concave structures 34 are provided on the plane 354. All concave structures 34 have two first curved surfaces 341 facing each other and two second curved surfaces 342 facing each other, the two first curved surfaces 341 having the foundation 355. ) And symmetric to each other by the base 355, the two second curved surfaces 342 also extend to the base 355 and symmetric to each other by the base 355, where Base 355 is one point. The first curved surface 341 is connected to each other at the first curved surface 341 and the top portion 353 of the other adjacent concave structure 34 to form one first arc surface 351, the second curved surface 342 and the second curved surface 342 of the other adjacent concave structure 34 are connected to each other at the top portion 353 to form one second arc surface 352. As can be seen in FIGS. 4 and 5, the slopes of the tangents of all the points of the two first curved surfaces 341 and the second second curved surfaces 342 are different depending on the positions of the points, so that the light rays parallel to each other are After passing through the structural surface layer 31 the direction no longer remains parallel. Through this, the angle of diffusion of the light rays passing through the concave structure 34 may be adjusted, and the luminance uniformity may be improved by sufficiently mixing the light rays.

In addition, since the first arc surface 351 and the second arc surface 352, in which the two concave structures 34 are connected to each other, are arc-shaped, no acute angle is generated. As a result, scratches do not easily occur when the luminance enhancing film or other optical film is placed on the optical thin plate 3, and when the optical thin plate 3 is molded in a mold, the parts adjacent to each other are designed to have an arc shape. The thin plate 3 makes it easy to exit the mold after the manufacturing process is completed.

Subsequently, optical simulation was performed on the concave structure 34 of the present invention to prove that the optical thin plate 3 of the present invention achieved the effect to be achieved. 6 is a layout view of all the facilities for performing the optical simulation. Referring to FIG. 6, the concave structure 34 lies between one light source 96 and one screen 95, and after the light beam emitted from the light source 96 passes through the concave structure 34, the screen ( 95). The projected result is as shown in FIG. 7A. In the optical simulation, the light source 96 is one LED light, and the light intensity of the emitted light beam and the narrow angle in the vertical direction satisfy the following relationship.

Where I is the intensity of light and A is a constant.

In order to compare the light diffusing effect of the conventional optical thin plate 2, the concave structure 34 was replaced with the concave structure 24 shown in FIG. 2, and the simulation was performed again. The projected result is as shown in FIG. 7B. . 7A and 7B, the darker the color, the stronger the luminance. Here, the uniformity of FIG. 7A is about 78%, and the uniformity of FIG. 7B is about 69.5%. Uniformity here means (maximum luminance-minimum luminance) / maximum luminance. From this, it can be clearly seen that the concave structure 34 of the present invention, as shown in Figs. 7A and 7B, has a relatively good light diffusing effect and can have a relatively uniform luminance distribution.

The structure of the concave structure 34 of this embodiment is shown in Fig. 8A, wherein the entire perimeter of the top portion 353 is one forward shape. However, those skilled in the art can design this into a trapezoidal or rhombus shape, and the structures of the trapezoidal or rhombus are the concave structure 44 and the concave structure 54 shown in FIGS. 8B and 8C. In addition, the base portion 355 of FIGS. 4 and 5 has the first curved surface 341 and the second curved surface 342 extending downward to be connected to each other to form a single point; 8D, the base portion 655 of the concave structure 64 is one planar shape or an arc shape, and this function can be achieved.

In addition to this, the present invention has other embodiments. 9, 10A to 10C, FIG. 9 is a perspective view of an optical thin plate of a fifth embodiment according to the present invention, FIG. 10A is a concave structure perspective view of a fifth embodiment according to the present invention, and FIG. 10B is a present invention. BB is a sectional view of the concave structure of the fifth embodiment according to the present invention, and FIG. 10C is a CC sectional view of the concave structure of the fifth embodiment according to the present invention. Here, the B-B cross section and the C-C cross section of FIG. 10A are as shown in FIGS. 10B and 10C. As shown in the figure, the upper side of the optical thin plate 7 of this embodiment was composed of one structural surface layer (not shown) and one main body 75. Among them, the main body 75 includes one plane 754 and one top portion 753, and the structural surface layer includes a plurality of concave structures 74 adjacent to each other, and the concave structure 74. Is installed on the plane 754. All concave structures 74 have one first curved surface 741 and two facing second curved surfaces 742, wherein the first curved surface 741 extends downward and has two second curved surfaces ( Adjacent to each other 742, the two second curved surfaces 742 are symmetrical to each other by the first curved surface 741. The first curved surface 741 is connected to each other at the first curved surface 741 and the top portion 753 of another adjacent concave structure 74 to form a first arc surface 751, the second curved surface ( 742 and the second curved surface 742 of the other adjacent concave structure 74 are connected to each other at the top portion 753 to form a second arc surface. This embodiment can achieve the above-described effects.

Naturally, those skilled in the art can design the concave structure of the third embodiment into a trapezoid or rhombus, and the structure of the trapezoid or rhombus is the concave structure 84 and the concave structure 94 shown in FIGS. 11A and 11B. ), Thereby achieving the above goal.

As described above, the optical thin plate of the present invention can increase the luminance uniformity, lower the probability of scratching other optical films or luminance enhancement films, and can easily fall out of the mold after molding, thereby achieving huge commercial profit.

Embodiments of the invention are as described above, the invention is not limited to the embodiments previously described and the scope of the patent is determined by the claims that follow. Those skilled in the art can make various modifications to this and can suggest various other variables without departing from the spirit and scope of the invention.

1 is a display diagram showing various components of a liquid crystal display currently on the market.

2 is a display diagram showing an optical thin plate disclosed in US Patent US7320538.

3 is a cross-sectional view showing the optical thin plate of the first embodiment according to the present invention.

Fig. 4 is a diagram showing the structural surface layer of the optical thin plate of the first embodiment according to the present invention.

5 is a view showing two adjacent concave structures of the first embodiment according to the present invention.

6 is a layout view of various equipment used to conduct optical simulation.

7A is an optical simulation diagram of an optical thin plate according to the present invention.

7B is an optical simulation diagram of a conventional optical thin plate.

8A is a perspective view of a concave structure of the first embodiment according to the present invention.

8B is a perspective view of the concave structure of the second embodiment according to the present invention.

8C is a perspective view of the concave structure of the third embodiment according to the present invention.

8D is a perspective view of the concave structure of the fourth embodiment according to the present invention.

9 is a perspective view of an optical thin plate of a fifth embodiment according to the present invention.

10A is a perspective view of a concave structure of the fifth embodiment according to the present invention.

10B is a sectional view taken along the line B-B of the concave structure of the fifth embodiment according to the present invention.

10C is a C-C cross-sectional view of the concave structure of the fifth embodiment according to the present invention.

11A is a perspective view of a concave structure of a sixth embodiment according to the present invention.

Fig. 11B is a perspective view of the concave structure of the seventh embodiment according to the present invention.

* Description of the symbols for the main parts of the drawings *

Advanced Technology

1: liquid crystal display 21: structure surface layer

11: backlight module 22: subject layer

111: reflective cover 24: concave structure

112: light source 244: adjacent contact

113: diffuser plate 24A: first surface

114: luminance enhancing film 24B: second surface

12: liquid crystal panel 29: adhesive layer

2: optical lamination A, B: position

<Invention>

3, 7: Optical thin plate 351, 751: No. 1 surface

31: structure surface layer 352, 752: surface 2

32: subject layer 353, 753: top

33: base layer 354, 754: plane

34, 44, 54, 64, 74, 84, 94 355, 655: Foundation

Concave Structure 95: Screen

341 and 741: first curved surface 96: light source

342 and 742: second curved surface θ: narrow angle

35, 75: main body

Claims (12)

A body comprising a plane, a base and a top, wherein the plane, the base and the top do not cross each other; And A plurality of concave structures adjacent to each other, wherein the concave structures are provided on the plane, and all the concave structures have at least two opposing first curved surfaces and at least two opposing second curved surfaces, The first curved surface extends to the foundation portion, and the second curved surface includes a structural surface layer extending to the foundation portion, The first curved surface and the first curved surface of the adjacent concave structure different from each other are connected to each other at the top portion to form one first arc surface, and the second curved surface and the second curved surface of the adjacent concave structure different from the second curved surface are made of one first surface at the top portion thereof. An optical thin plate for adjusting and controlling the angle of diffusion of light, characterized by forming a second surface. The method of claim 1, An optical sheet for adjusting and controlling the angle of diffusion of light, characterized in that the perimeter of the top of all concave structures forms one trapezoid, one rectangle, one rhombus, or one square. The method of claim 1, The base portion is an optical thin plate for adjusting and controlling the angle of diffusion of light, characterized in that one point shape, one plane shape, or one arc shape. The method of claim 1, Further comprising a main layer, wherein the main layer is below the structural surface layer, a plurality of light diffusion particles are distributed in the main layer, the refractive index of the light diffusion particles and the refractive index of the main layer is mutually An optical thin plate for adjusting and controlling the angle of diffusion of light, characterized in that the other. The method of claim 4, wherein And a base layer, wherein the base layer is below the main layer, and the base layer includes an ultraviolet absorber. The method of claim 1, And said first two curved surfaces are symmetrical by said base portion. The method of claim 1, And the two second curved surfaces are symmetrical to each other by the base portion. A body comprising one plane and one top portion; And A plurality of adjacent concave structures, the concave structures being installed in the plane, all concave structures having a first curved surface and at least two opposing second curved surfaces, the first curved surface being below Wherein the second curved surface comprises a structural surface layer adjacent to each other, The first curved surface and the first curved surface of the adjacent concave structure different from each other are connected to each other at the top portion to form one first arc surface, and the second curved surface and the second curved surface of the other adjacent concave structure are connected to each other at the top portion thereof. The optical thin plate for adjusting and controlling the diffusion angle, characterized in that to form one second arc surface. The method of claim 8, An optical sheet for adjusting and controlling the angle of diffusion, characterized in that the circumference of the top of all concave structures forms one trapezoid, one rectangle, one rhombus, or one square. The method of claim 8, Further comprising a main layer, wherein the main layer is below the structural surface layer, a plurality of light diffusing particles are distributed in the main layer, the refractive index of the light diffusing particles and the refractive index of the main layer An optical thin plate for adjusting and controlling the diffusion angle, characterized in that the other. 11. The method of claim 10, And a base layer, wherein the base layer is below the main layer, and the base layer includes an ultraviolet absorber. The method of claim 8, And the two second curved surfaces are symmetrical to each other by the first curved surface.

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