TWI702443B - Optical plate, optical structure, backlight module and display device with protrusions - Google Patents

Abstract

An optical plate, an optical structure, a backlight module and a display device with protrusions are provided. The optical plate includes a main body having a first surface, and several protrusions formed on and projected from the first surface of the main body. An area ratio of the protrusions to the first surface is 0.03％~35％. A pitch of the protrusions is in a range of 0.5mm to 10mm, and a portion of the first surface outside the protrusions has a mean roughness Ra in a range of 0.01µm to 0.1µm.

Description

Optical plate with protrusions, optical structure, backlight module and display device

The invention relates to an optical plate, an optical structure, a backlight module and a display device, and more particularly to an optical plate with protrusions, an optical structure, a backlight module and a display device that can be used as a diffuser plate.

The diffusion plate is an optical plate used in electronic products such as display devices. Its main function is to diffuse and atomize the light from the light source, so that the product screen presents a uniform brightness image quality. Different electronic products have different requirements for screen image quality. Therefore, when the diffuser manufacturer manufactures the diffuser, it will manufacture the diffuser with different light transmittance according to the needs of the downstream manufacturer. Taking the lateral backlight module applied to display devices (such as liquid crystal display devices) as an example, it generally includes a light guide plate formed of a light-transmitting material, and a light source (such as a cold cathode tube formed by the side end of the light guide plate). Line light source), a light reflection film located under the light guide plate and the line light source, and a diffuser and/or lens film arranged on the light guide plate to form a light-emitting surface.

In order to improve brightness and reduce power consumption, in recent years, in color liquid crystal display devices, one or two lens films with a ridge shape on the surface of the diffuser plate or between the diffuser plate and the light guide plate are often placed on the surface of the diffuser. The light emitted from the light guide plate is efficiently concentrated in the front direction of the liquid crystal panel. In addition, in order to improve the unevenness of the amount of light caused by the distance between the light source and the light source, there is also a technique to print a dot pattern formed by light diffusing ink on the inside of the light guide plate, which increases as it moves away from the light source, but the arrangement of the diffuser plate The main purpose is to diffuse the light uniformly and prevent the dot pattern printed on the light guide plate from being seen. In the past, these lens films were manufactured by embossing a thermoplastic resin plate or using a radiation-curable resin to transfer the shape of the ridge. However, these existing lens films have a high manufacturing cost and are considered to be the main reason for the high price of the backlight module. In addition, the existing lens films are also limited in their manufacturing methods, so that the material selection range is too narrow. Furthermore, the lens film has to be used in combination with the light diffusing film because it does not have the light diffusing effect, which causes the problem of complicated assembly steps of the backlight module.

In addition, in addition to the above-mentioned diffuser in the display device, a variety of functional films such as diffuser film, lens film, and brightness enhancement film may also be used to increase the brightness of the display screen and reduce the brightness unevenness of the entire screen, in order to achieve For the purpose of thinning and reducing the cost of display devices, many researches are currently focused on the development of optical plates that integrate multiple functions, such as the development of the light diffusion effect of the integrated diffuser and the light collection effect of the brightness enhancement film into an optical plate. In particular, as display devices (such as LCD TVs) have progressed from small to large, it is more desirable to develop an optical diffuser that can reduce the number of functional films used while improving brightness and diffusion performance.

The present invention relates to an optical plate, an optical structure, a backlight module and a display device, which have specially designed protrusions, which can improve the uniformity of luminance when used as a diffuser. ).

According to the present invention, an optical plate is provided, including: a body having a first surface; and a plurality of protrusions located on the first surface and protruding from the first surface, the protrusions occupying a ratio of 0.03%~35%, the protrusions have a pitch of 0.5mm~10mm, and the first surface outside the protrusions has a first centerline average roughness Ra of 0.01µm~0.1 µm.

The present invention provides an optical structure, including the optical plate of the foregoing embodiment, an optical film disposed above the first surface of the main body, and a colloid layer disposed between the optical plate and the optical film, wherein the colloid layer adheres the protrusions There is an air layer between the top surface of the part and the first surface and the colloid layer.

The present invention provides an optical structure including the optical plate of the foregoing embodiment, an optical film, and a colloid layer. The optical plate includes a body and several protrusions. The body has a first surface. The protrusion protrudes from the first surface. One of the protrusions has an outer diameter of 200 µm~500 µm and a maximum height of 10 µm~35 µm. There is a distance between two adjacent protrusions of 0.5 mm~ 10mm. The optical film is arranged above the first surface of the body. The colloid layer is arranged between the optical plate and the optical film, the colloid layer is bonded to the top surface of the protrusion, and there is an air layer between the first surface and the colloid layer.

The present invention provides a backlight module that includes a light source and the optical plate of the foregoing embodiment or the optical structure of the foregoing embodiment and the light source are arranged correspondingly.

The present invention provides a display device comprising the optical plate of the foregoing embodiment or the backlight module with the optical structure of the foregoing embodiment, wherein the display device is selected from the group consisting of televisions, notebook personal computers, mobile computers, and computers. A group of monitors.

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

An embodiment of the present invention provides an optical plate, which can be applied to a display device as a diffuser plate of a backlight module. The optical plate of the embodiment utilizes the protrusions formed on the surface of the main body and the design of reducing the surface roughness to improve the uniformity of luminance of the light-emitting area of the display device (for example, the uniformity of the four corners). Therefore, according to the embodiment, a diffusion plate with high diffusion performance can be provided, which reduces the number of other traditional functional films used, thereby reducing costs and making application display devices lighter and thinner (especially large-sized display devices). When the optical plate of the embodiment is used as a diffuser, the surface of the main body (eg, the first surface) with protrusions can face the light source of the backlight module, and the rougher back surface (eg, the second surface) of the main body can also face the backlight. The light source of the module.

The following describes the implementation in detail with reference to the attached drawings. It should be noted that the structure and content proposed in the embodiments are for illustrative purposes only, and the scope of the present invention to be protected is not limited to these aspects. In the embodiments, the same or similar reference numerals are used to indicate the same or similar parts. It should be noted that the present invention does not show all possible embodiments. The structure can be changed and modified without departing from the spirit and scope of the present invention to meet actual application requirements. Therefore, other implementation aspects not proposed in the present invention may also be applicable. Furthermore, the drawings have been simplified to clearly illustrate the content of the embodiments, and the size ratios in the drawings are not drawn in proportion to the actual product. Therefore, the contents of the description and illustrations are only used to describe the embodiments, not to limit the protection scope of the present invention.

Furthermore, the ordinal numbers used in the specification and the claims, such as the terms "first", "second", "third", etc., are used to modify the elements of the claim, and do not in themselves mean or represent the requested element Any previous ordinal numbers do not represent the order of a request element and another request element, or the order of the manufacturing method. The use of these ordinal numbers is only used to enable a request element with a certain name to be compatible with another Request elements with the same name can be clearly distinguished. Furthermore, terms related to space that may be used in the description and the request, such as "beneath", "below", "lower", "above", " "Upper" (upper) or similar words are used to facilitate the description and reference of the spatial relationship between one element or feature and another element or feature as drawn in the illustration. Therefore, those with ordinary knowledge can understand that these spatially related terms include not only the orientation of the components as shown in the figure, but also the orientation of the components that are different from the orientation when used or operated. Therefore, the terms used in the specification and claims are only used to describe the embodiments, rather than to limit the protection scope of the present invention.

Figure 1 is a partial schematic diagram of an optical plate according to an embodiment of the invention. FIG. 2A is a schematic cross-sectional view of a protrusion along a cross-sectional line 2-2 in FIG. 1. FIG. Fig. 2B is a schematic diagram of the single protrusion 20 of Fig. 1. Please refer to both Figure 1 and Figure 2A. The optical plate 1 of an embodiment includes a main body 10 and a plurality of protrusions 20 located on the first surface 101 of the main body 10 and protruding from the first surface 101. Among them, the protrusions 20 have a pitch Dp of 0.5mm~10mm. Within this pitch range, the optical plate can maintain high brightness performance and avoid friction during transportation or assembly. The first surface 101 is scratched. In one example, the distance Dp between the protrusions 20 is 0.5mm-9mm; in another example, Dp is 0.5mm-8mm. The part of the first surface 101 other than the protrusion 20 is a smooth surface. In an example, the portion of the first surface 101 outside the protrusion 20 has a first centerline mean roughness Ra, and its Ra value is, for example, 0.01 µm~0.1 µm, when the Ra value is 0.01 µm~ When 0.1μm, the diffuser can have good four-corner uniformity. In an example, the first centerline average roughness Ra of the first surface 101 is, for example, not more than about 0.08 µm, that is, about 0.08 µm or less than 0.08 µm. In another example, the ten-point mean roughness Rz of the first surface 101 ranges from 0.1 μm to 1 μm, for example, from 0.5 μm to 1 μm. In an example, the body 10 and the protrusion 20 are integrally formed, for example.

In one embodiment, the protrusion 20 has a maximum height Hp between the apex P of the protrusion and the first surface, and the maximum height Hp ranges from 10 µm to 35 µm, for example, from 12 µm to 30 µm, or It is between 15µm~27µm. In one example, the maximum height Hp of the protrusion 20 (without limitation) is about 19.32 μm; in another example, the maximum height Hp (without limitation) of the protrusion 20 is about 16.46 μm. Furthermore, taking a single protrusion 20 as an example, the outer diameter Dm of the protrusion 20 is defined as a maximum diameter of the bottom surface of the protrusion 20 in contact with the first surface 101 of the body 10. The distance Dp between the protrusions 20 is defined as the sum of the outer diameter Dm of one of the protrusions and the shortest distance Ds between two adjacent protrusions 20, that is, Dp is the sum of Dm and Ds. In one embodiment, the bottom surface of the protrusion 20 contacting the first surface 101 is substantially circular, and its outer diameter Dm ranges from 200 μm to 500 μm, such as 250 μm to 450 μm, or 270 μm to 400 μm. In one example, the outer diameter of the protrusion 20 (not limitedly) is about 310.51 µm.

In one embodiment, the ratio Hp/Dm of the maximum height Hp of the protrusion 20 to the outer diameter Dm ranges from 0.01 to 0.2, for example, in the range of 0.01 to 0.18, or in the range of 0.02 to 0.175. In one example, the ratio of Hp/Dm of the protrusion 20 (without limitation) is about 0.062; in another example, the ratio of Hp/Dm of the protrusion 20 (without limitation) is about 0.053.

In addition, in the embodiment, the surface of a protrusion 20 and the first surface 101 of the main body 10 form an inclination angle α. As shown in Figure 2A, an inclination angle α is formed between the outermost edge of the bottom of a protrusion 20 and the apex P of the protrusion, which is in the range of 2 degrees to 10 degrees, for example, 2.5 degrees to 9 degrees, or It is 3 degrees to 7.5 degrees. In an example, the inclination angle of the protrusion 20 (not limitedly) is about 5.2 degrees.

In one embodiment, the protruding surface 201 of the protruding portion 20 has a curved surface. As shown in Fig. 1, the protrusion 20 is a bump, and its shape may be a certain part of a sphere. Therefore, in one embodiment, the projection of the protrusion 20 on the first surface 101 is circular, and the protrusion 20 has a curved surface with a radius of curvature between 300 µm and 1000 µm, for example, 400 µm to 900 µm, or 450 µm to 850 µm. . In an example, one of the radius of curvature of the protrusion 20 is (not limited to) about 640 µm.

As shown in Figure 2B, the protrusion 20 of this embodiment is a part of a sphere, and the projection of the protrusion 20 on the first surface 101 (not shown in Figure 2B) is circular. The protruding surface 201 includes a curved surface, the top of the curved surface is the protruding vertex P, and the inclination angle α is the angle between the protruding vertex P and the first surface 101, such as an acute angle. However, the embodiment of the present invention does not limit the protrusion 20 to be a part of a sphere, and it may have other types of geometrical forms. The following is a further example with the use of FIGS. 3A-7B.

Figures 3A to 3D draw other examples where the protrusion surface 201 is a curved surface. Please refer to Figures 3A to 3B. The projection of the protrusion 20 on the first surface 101 (not shown in Figures 3A to 3B) is arc-shaped. The protrusion surface 201 includes a curved surface and an inclined surface, and the curved surface meets the inclined surface. And the highest point where they meet is the vertex P of the protrusion, and the inclination angle α is the angle between the inclined surface and the first surface 101, such as an acute angle between them. Please refer to Figures 3C~3D, which shows the protrusion surface 201 as an example of two curved surfaces that meet each other. In Figure 3C, the protrusion surface 201 includes two adjacent curved surfaces. The highest point of contact is the protrusion vertex P and the inclination angle α It is the angle between the vertex P of the protrusion and the first surface 101. The 3D drawing shows an example of an inclined surface in addition to the two curved surfaces connected. For example, the 3D image includes a total of three surfaces, and the inclination angle α in the 3D image is the angle between the inclined surface and the first surface 101.

In one embodiment, the protrusion 20 includes a curved surface, and the inclination angle α is the angle between the vertex P of the protrusion and the first surface 101; in another embodiment, the protrusion 20 includes an inclined surface, and the inclination angle α is the inclined surface and the first surface 101. The included angle.

In one embodiment, as shown in FIGS. 4A to 4C, the protruding portion 20 is a conical bump, and the vertex P of the protruding portion is located at the conical tip. Please refer to FIG. 4A first, the projection of the protrusion 20 on the first surface 101 is circular, and the protrusion surface 201 has a curved surface. Referring to FIGS. 4B and 4C, the projection of the protrusion 20 on the first surface 101 may be a polygon, such as a quadrilateral as shown in FIG. 4B, such as a square or rectangle, or a triangle as shown in FIG. 4C. As shown in FIGS. 4B to 4C, in one embodiment, the protruding surface 201 is composed of a plurality of inclined surfaces, and is shaped like a pyramid or a triangular tower, and the inclination angle α is the angle between the inclined surface constituting the protruding surface 201 and the first surface 101. In another embodiment, the protruding surface 201 may be composed of multiple curved surfaces, and the inclination angle α is formed between the vertex P of the protruding portion and the first surface 101.

In one embodiment, the projection of the protrusion 20 on the first surface 101 of the main body 10, that is, the bottom surface of the protrusion 20 where the protrusion 20 is in contact with the first surface 101 of the main body 10, has a regular shape, for example, FIGS. 4A to 4C As shown in the circle, square, triangle or other polygons, the ratio of the area of the regular shape to the square of the perimeter (ie area/perimeter ² ) is 0.03~0.08, for example, 0.039(triangle)~0.0796(circle shape).

In one embodiment, referring to Figures 5A to 5C, the protrusion 20 is a protrusion platform, which may include a top surface 20u, the top surface 20u is a flat surface, and the vertex P of the protrusion is any point on the top surface 20u.

In one embodiment, the protruding portion 20 includes a recessed portion 20R. The recessed portion 20R is formed at the center of the protruding portion 20, which can be regarded as being formed downwardly from the top of the protruding portion 20. The bottom of the recessed portion 20R is a recessed point 20R1 or a flat surface 20R2, so the vertex P is formed around the recessed portion 20R, that is, the recessed portion 20R is formed between at least two vertexes P. As shown in FIG. 6A ~ 6B of FIG. 20 has a projecting portion 20R1 pits P in between two vertices, vertex distance P and pits recessed portion 20R1 of the projection of the depth H _D 20. In one embodiment, the ratio of the protrusion 20 is recessed a depth _D and a maximum H height Hp is _{((H D / Hp) ⨯100} %) may be 15% to 100% range, for example, 30% to 100%, or It is 50%~90%. As shown in FIG. 6C, the bottom of the recessed portion 20R is a flat surface 20R2, and there may be multiple vertices P around the recessed portion 20R. In this embodiment, the multiple vertices P are arranged in a ring shape. In one embodiment, as shown in FIG. 6C, the plane 20R2 protrudes relative to the first surface 101 (not shown in FIG. 6C) of the main body 10. In another embodiment, the plane 20R2 may be coplanar with the first surface 101. As shown in Figure 6D, which shows a cross-sectional view of Figure 6C along 6D-6D', in this embodiment, the protruding surface 201 is a curved surface, the apex P of the protruding part is located at the highest point of the curved surface, and the protruding part of the ring structure has A plurality of protruding apexes P are arranged in a ring structure, and the plane 20R2 protrudes relative to the first surface 101 of the main body 10. As shown in FIG. 6E, it is another schematic diagram of the cross-sectional view of FIG. 6C along 6D-6D'. The difference from FIG. 6D is that the protruding surface 201 of FIG. 6E is a slope. In one embodiment, the recessed portion 20R may be connected to the first surface 101 (drawn in a dotted line in Figure 6D). At this time, the protruding portion 20 forms a ring structure, that is, the plane 20R2 of the recessed portion 20R is the same as the first surface 101. flat, concave depth H _D with the same maximum height Hp of both. Please refer to FIGS. 6F to 6H, a schematic diagram of the recessed portion 20R and the first surface 101 (not shown in FIGS. 6F to 6H) being connected or coplanar. In one embodiment, as shown in FIG. 6F It has a circular ring shape with the protrusion 20 shown in FIG. 6G; in another embodiment, the protrusion 20 may be a polygonal ring, such as a quadrangular ring as shown in FIG. 6H. Please refer to Figure 6I, which shows a cross-sectional view of Figure 6F along 6I-6I'. In this embodiment, the protrusion surface 201 is a curved surface, the apex P of the protrusion is the highest point of the curved surface, and the protrusion 20 of the ring structure has a plurality of The apexes P of the protrusions are arranged in a ring structure. Please refer to FIG. 6J again, showing another schematic diagram of the cross-sectional view of FIG. 6F along 6I-6I'. The difference from FIG. 6I is that the protruding surface 201 of FIG. 6J is a slope. Please refer to FIG. 6K, which shows a schematic view of the cross-sectional view of FIG. 6G along 6K-6K′. In this embodiment, the concave point 20R1 of the concave portion 20R is in contact with the first surface 101.

In one embodiment, the protrusion 20 may have a stepped "convex" structure, as shown in FIGS. 7A and 7B, it may be integrally formed or two of the above structures with different sizes can be stacked to form a structure. For example, it is a structure of stacking different sizes of Figures 5A to 5C and Figure 2B.

In one embodiment, the protruding surface 201 of the protruding portion 20 is a smooth surface, such as a smooth curved surface. Of course, the size, inclination angle and radius of curvature of the above-mentioned protrusion 20 can be changed and adjusted according to actual application requirements and design, and are not limited to the above-mentioned values, so the present invention does not limit this. In an example, the size, inclination angle and radius of curvature of each protrusion 20 are approximately the same with each other, and have a regular shape; of course, it may also be slightly different due to process variation, as long as it is within the protection scope of the present invention. All of these are the characteristics of the present invention.

In addition, the thickness of the optical plate 1 is the thickness Hm of the main body 10 plus the height Hp of the protrusion 20. When the optical plate 1 of the present invention is used as a diffuser for a backlight module, the thickness of the optical plate 1 is 0.5 mm~ 6mm is better. Thickness exceeding 6mm may be unsuitable for use in display devices that are pursuing lightness and thinness due to excessive thickness and weight. When the thickness is thinner than 0.5mm, it may affect the diffusion effect during application due to insufficient rigidity. In one embodiment, the thickness of the optical plate 1 is in the range of 0.6 mm to 5 mm (600 μm to 5000 μm); in another embodiment, the thickness of the optical plate 1 is in the range of 0.8 mm to 3 mm. In another embodiment, the thickness of the optical plate 1 is 0.8 mm~2.5 mm. Since the height Hp of the protrusion 20 is very small compared to the thickness Hm of the main body 10, the thickness of the optical plate 1 (ie, the main body thickness Hm plus the height Hp of the protrusion 20) can be regarded as approximately or equal to the thickness Hm of the main body 10.

FIG. 8 is a schematic diagram of a plurality of protrusions distributed on the main body of the optical plate according to an embodiment of the present invention. In one embodiment, the plurality of protrusions 20 may be evenly (regularly) arranged and distributed on the first surface 101 of the main body 10, for example. As shown in Fig. 8, the protrusions 20 located in the upper and lower rows are arranged in a staggered arrangement. In this example, the encircled enlarged part in the figure can be regarded as a repeating unit in the arrangement of the protrusions 20, and a repeating unit includes each of the 1/4 protrusions 20-1, 20-2, 20 at the four corners. -3, 20-4 and one protrusion 20-5 at the center, totaling two protrusions 20. The arrangement of the protrusions in this single repeating unit is similar to the face-centered cubic arrangement in the crystal lattice. In one embodiment, the proportion of the regularly arranged protrusions in the total protrusions is more than 90%, for example, 95% or more, that is, the repetition ratio of the repeating unit is as high as 90% or more.

In one embodiment, the proportion of the protrusion 20 relative to the first surface 101 of the main body 10 is 0.03%-35%, for example, 0.07%-32%. In an example, the proportion of one of the protrusions 20 is (not limited to) about 0.30%. In another example, the proportion of one of the protrusions 20 (without limitation) is about 1.21%. In another example, the proportion of one of the protrusions 20 (without limitation) is about 4.83%. The proportion of the protrusions 20 relative to the first surface 101 of the body 10 can be calculated from the distribution shown in Figure 8. For example, the proportion of the protrusions (the proportion, which can also be called the distribution density of the protrusions) can be calculated by dividing the area occupied by the two protrusions 20 by the area of a repeating unit.

Taking a single protrusion with an outer diameter Dm of 310µm (radius approximately 155µm) and a distance Dp between protrusions 20 of 5000µm (ie 5mm) as an example, the area of a repeating unit = 2×5000 ² , The area is π×155 ² =75477µm ² and the proportion of the protrusion is: (2×75477)÷(2×5000 ² )=0.30%.

Taking a single protrusion with an outer diameter Dm of 310µm (radius approximately 155µm) and a distance Dp between protrusions 20 of 2500µm (ie 2.5mm) as an example, the area of a repeating unit = 2×2500 ² , and the protrusion The proportion of the department is: (2×75477)÷(2×2500 ² )=1.21%.

Taking a single protrusion with an outer diameter Dm of 310µm (radius approximately 155µm) and a distance Dp between protrusions 20 of 1250µm (ie 1.25mm) as an example, the area of a repeating unit = 2×2500 ² , and the protrusion The proportion of the department is: (2×75477)÷(2×1250 ² )=4.83%.

In one embodiment, the proportion of the first surface 101 other than the protrusion 20 is 65% to 99.97%, for example, 68% to 99.93%.

Compared with the microstructure of the existing diffuser plate, the present embodiment has a larger size of the protrusion 20, for example, the outer diameter Dm (the maximum characteristic dimension of the bottom surface, such as the diameter) of a single protrusion 20 ranges from 200 µm to 500 µm. And the spacing reaches 0.5mm (=500µm)~10mm (=10000µm); while the single microstructure of the existing diffuser is, for example, a few µm to 30 µm, and the spacing is only a few µm to 300 µm or less. Therefore, compared with the small size and dense distribution of the microstructure of the existing diffuser plate, the protrusions 20 of the optical plate of the embodiment have a larger size and a looser distribution. With such large-sized and loosely distributed protrusions 20 and controlling the roughness of the first surface 101, the light reflectivity can be increased, thereby improving the brightness uniformity. In addition, under this design, even if the protrusions 20 are arranged in a regular arrangement as shown in Figure 1, when the optical plate of the embodiment is used as the diffuser of the backlight module, it can still reduce or even avoid moire interference. The occurrence of streaks.

Furthermore, according to the embodiment of the present invention, the upper and lower surfaces of the main body 10 of the optical plate 1 have different roughnesses. In one embodiment, the first surface 101 of the main body 10 is a smooth surface, and a second surface 102 of the main body 10 opposite to the first surface 101 may be a rough surface. That is, the second surface roughness of the second surface 102 is greater than the first surface roughness of the first surface 101 except for the protrusion 20. In an example, the average roughness Ra of the second center line is, for example, 3 μm-7 μm. In an example, the ten-point average roughness Rz of the second surface 102 is, for example, 20 μm to 35 μm. When applied to a backlight module, the first surface 101 can be a light-incident surface and the second surface 102 can be a light-emitting surface; the second surface 102 can also be a light-incident surface and the first surface 101 can be a light-emitting surface.

In addition, in the embodiment, the optical plate 1 is made of, for example, a light-transmitting material, such as a light-transmitting resin, and a plurality of diffusion particles are added to be dispersed therein. Usable light-transmitting resins such as polycarbonate, polystyrene (PS), polymethyl methacrylate (PMMA), methyl methacrylate-styrene (MS), acrylonitrile-styrene ( AS), cyclo-olefin copolymer, polyolefin copolymer (such as poly-4-methyl-1-pentene), polyethylene terephthalate (polyethylene terephthalate), polyester, polyolefin copolymer Ethylene, polypropylene, polyvinyl chloride, ionomer, etc. Among them, polycarbonate, polystyrene, polymethyl methacrylate, and methyl methacrylate-styrene are preferred. Therefore, in one embodiment, after the optical plate is manufactured, the body of the optical plate and the formed protrusions may further include a plurality of diffusion particles (such as transparent particles) dispersed therein for use as a light diffusing agent.

In one embodiment, the light-transmitting resin that can be used is a resin with a flexural modulus (Flexural Modulus) greater than 1 GPa, for example, a resin with a flexural modulus greater than 2 GPa. This type of resin can produce relatively high resistance under external force. Small deformation, that is, better supportability, makes the optical plate 1 more suitable for backlight module applications, that is, it has good supportability without excessively increasing the thickness of the optical plate 1.

In one embodiment, the average molecular weight of the translucent resin ranges from 150,000 to 450,000. Within this range, the translucent resin has both good mechanical properties and processability; in another embodiment, control The softening point temperature of the translucent resin (50℃/hr, 1kg) at 95℃~150℃ can also make the translucent resin have good processability.

In one embodiment, the methanol-soluble part of the light-transmitting resin, that is, the total content of oligomers, additives, residual monomers and other components dissolved in methanol, can be less than 1.5% by weight, so that light transmission can be ensured The heat resistance of the resin.

In one embodiment, the transparent diffusion particles are, for example, inorganic microparticles represented by silicon dioxide and titanium dioxide, organic microparticles such as polystyrene resin, (meth)acrylic resin, silicon resin, etc., and organic microparticles are preferred, such as Organic particles are used alone, or organic particles and inorganic particles are mixed. The organic microparticles are preferably bridged organic microparticles. In the manufacturing process, at least part of the bridge is bridged, so that no deformation occurs during the processing of the translucent resin, and the microparticle state can be maintained. That is, particles that do not melt in the light-transmitting resin even when heated to the molding temperature of the light-transmitting resin are preferable, and more preferably organic micro-particles of (meth)acrylic resin or silicone resin that have been bridged. In one embodiment, particularly suitable transparent particles (diffusion particles) include, for example, poly(butyl acrylate) core/poly(methyl methacrylate) core polymer particles with partially bridged methyl methacrylate as the matrix Shell polymer, core/shell type polymer with a rubbery ethylene polymer core and shell (manufactured by Rohm and Hass Campany, trade name Paraloid EXL-5136), with bridging silicone alkyl Silicon resin [manufactured by Toshiba Silicone Co., Ltd., trade name Tospearl 120].

In one embodiment, the average particle size of the diffusion particles is 0.01 µm-30 µm. In another embodiment, the average particle size of the diffusion particles added to the optical plate 1 is 0.01 μm-20 μm. In another embodiment, the average particle size of the diffusion particles added to the optical plate 1 is 0.01 µm-15 µm. The average particle size of the diffusion particles should preferably not protrude from the surface of the main body 10/protrusions 20. In one embodiment, inorganic particles and organic particles can be mixed together, for example, titanium dioxide particles with a particle size of 0.01 μm to 0.05 μm and silicon resin with a particle size of 1 μm to 10 μm are mixed. In an embodiment, the light transmittance of the optical plate 1 is 45%~70%, preferably 50%~65%. When the light transmittance of the optical plate 1 is 45% to 70%, it can maintain high brightness performance and avoid the problem of seeing the light source due to the high light transmittance.

In addition, the average particle size of the transparent microparticles as diffusion particles is the weight average particle size measured by the particle counting method, and the number of particles of Nippon Co., Ltd. can be used. The particle size distribution analyzer MODEL Zm is used as the measuring instrument. When the weight-average particle size is 0.01 µm~30 µm, sufficient light diffusivity can be obtained and the light-emitting mask can have excellent luminescence. The amount of addition can be effectively controlled, so that light diffusivity and light transmittance are better.

In addition, the usage amount of the transparent microparticles is 0.1-20 parts by weight based on 100 parts by weight of the translucent resin, and particularly suitably 0.35-12.5 parts by weight. In one embodiment, for example, 0.05 to 1 parts by weight of titanium dioxide particles and 0.3 to 11.5 parts by weight of silicone resin are added. When the amount of transparent particles used is less than 0.1 parts by weight, the light diffusivity is insufficient, and the light source can be seen through through. On the other hand, when the amount of transparent fine particles used exceeds 20 parts by weight, the light transmittance will be lowered and the brightness will deteriorate.

In one embodiment, the optical plate 1 can use polystyrene (PS) (for example: Taiwan Chi Mei GPPS PG-383D, its weight average molecular weight is about 300,000, and its softening point temperature is 106°C) translucent resin and transparent Fine particles (for example: adding 0.05 to 1 parts by weight of titanium dioxide fine particles with an average particle size of 0.01 µm to 0.055 µm and 0.3 to 11.5 parts by weight of silicone resin with an average particle size of 1 µm to 10 µm). Any method or device can be used for this combination. The layer is produced to form a base material (ie light diffusion plate). In the embodiment, for example, a melt extrusion method is used to form a plate-like structure with a predetermined thickness. When using melt extrusion, it is best to depressurize the melt zone of the extruder to 1.33~66.5 kPa before extrusion. If the melt zone of the extruder is not depressurized, the mixed transparent particles, especially the non-meltable acrylic polymer particles, will be affected by oxygen, which may cause partial collapse of the particle surface and reduce the light diffusion performance. In addition to this, conventionally known methods can also be used, such as injection molding, injection compression molding, blow molding, compression molding, powder molding, etc., to complete the optical plate 1 of the embodiment.

In addition, in addition to the production of a single-layer board, the optical plate 1 of the present invention may also be a multilayer board. For example, in addition to the above-mentioned translucent resin layer, it may also include a coating layer. In one embodiment, the thickness of the coating layer is 0.01 mm to 0.5 mm, or 0.02 mm to 0.4 mm, or 0.03 to 0.3 mm. If the thickness of the coating layer exceeds 0.5 mm, there may be a problem that the thickness of the backlight module unit may not fully meet the requirements of thinning the liquid crystal display device. Furthermore, the coating layer has, for example, high transparency that can fully exert the lens effect, and the usable resin is acrylic resin, such as polymethyl methacrylate, methyl methacrylate-styrene, acrylonitrile-styrene, etc. . Among them, polymethyl methacrylate and methyl methacrylate-styrene are preferred.

In addition, the composition of the optical plate 1 may further include the addition of ultraviolet absorbers to improve the weather resistance of the optical plate 1 and block harmful ultraviolet rays; and/or may include the addition of fluorescent agents, which can absorb The energy of the ultraviolet part of the light and the effect of radiating the energy to the visible part.

In an embodiment of the optical plate 1 being a multilayer plate, 100 parts by weight of the acrylic resin forming the above-mentioned coating layer contains 0.5-15 parts by weight of ultraviolet absorber, and diffusion with an average particle size of 0.01 µm-30 µm can be added as needed The particles are, for example, 0.1 to 20 parts by weight of transparent fine particles, and 0.001 to 0.1 parts by weight of phosphor.

In one embodiment, the ultraviolet absorber is for example: 2,2'-dihydroxy-4-methoxybenzophenone, benzophenone-based ultraviolet absorber, 2-(4,6-diphenyl-1, 3,5-Triazine-2-substituent)-5-hexylhydroxyphenol triazine-based ultraviolet absorber, 2-(2H-benzotriazole-2-substituent)-4-methylphenol, 2- (2H-Benzotriazole-2-substituent)-4-third octylphenol, 2-(2H-benzotriazole-2-substituent)-4,6-bis(1-methyl-1) -Phenylethyl)phenol, 2-(2H-benzotriazole-2-substituent)-4,6-bis-tertiary amylphenol, 2-(5-chloro-2H-benzotriazole- 2-substituent)-4-methyl-6-tertiary butylphenol, 2-(5-chloro-2H-benzotriazole-2-substituent)-2,4-tertiary butylphenol and 2,2'-methylene bis[6-(2H-benzotriazole-2-substituent)-4-(1,1,3,3-tetramethylbutyl)phenol] etc. Azole-based ultraviolet absorber.

In one embodiment, preferable ultraviolet absorbers are, for example, 2-(2-hydroxy-5-tolyl)benzotriazole, 2-(2-hydroxy-5-third octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-dicumyl)phenylbenzotriazole, 2-(2-hydroxy-3-tert-butyl-5-tolyl)-5-chlorobenzotriazole Azole, 2,2'-methylene bis[4-(1,1,3,3 tetramethylbutyl)-6-(2H-benzotriazole-2-substituent)phenol], 2-[ 2-hydroxy-3-(3,4,5,6-tetrahydrophthaliminomethyl)-5-tolyl]benzotriazole. Among them, 2-(2-hydroxy-5-third octylphenyl) benzotriazole (manufactured by Ciba-Geigy, trade name Tinuvin 329), 2,2'-methylene bis[4-(1, 1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-substituent)phenol] is preferred.

Furthermore, when the ultraviolet absorber is used in the examples, one component can be selected alone or two or more components can be used in combination, and 0.5-15 parts by weight relative to 100 parts by weight of the acrylic resin is preferably used, and 1-10 parts by weight Better servings. When the usage amount is less than 0.5 parts by weight, the weather resistance is poor and the hue changes greatly. When the usage amount is more than 15 parts by weight, the color tone and brightness are both deteriorated.

In addition, the fluorescent agent used in the examples (the one that can absorb the energy of the ultraviolet portion of light and radiate the energy to the visible portion) is within the range of not impairing the light resistance, and is used to combine synthetic resins, etc. The hue of which is improved to white or bluish white, such as stilbene series, benzimidazole series, benzoxazole series, phthalimide series, rose red series, coumarin series, oxazole series compounds, etc. In an embodiment, the amount of the phosphor used is, for example, in the range of 0.001 to 0.1 parts by weight relative to 100 parts by weight of the acrylic resin, and preferably in the range of 0.002 to 0.08 parts by weight. By blending the phosphor in the aforementioned range, the light-emitting surface can be sufficiently luminous and the color tone improved.

Although one of the embodiments of the present invention is further described in conjunction with FIG. 1 and FIG. 2A, the present invention is not limited thereto. FIG. 9 is a partial schematic diagram of an optical plate according to another embodiment of the invention. FIG. 10 is a schematic cross-sectional view of another type of protrusion along a cross-sectional line 10-10 in FIG. 9. The same or similar elements in Figures 9-10 and Figures 1~2A use the same or similar reference numerals to facilitate clear description. As shown in FIG. 9, the optical plate 1'also includes a body 10 and a plurality of protrusions 30 located on the first surface 101 of the body 10 and protruding from the first surface 101. In this embodiment, the distance Dp between the protrusions 30, the maximum height Hp and the inclination angle α, as well as the roughness of the first surface 101 and the second surface 102, etc., please refer to the foregoing content, and will not be repeated here. The protrusion 30 of this embodiment is different from the protrusion 20 described above in Figures 1 to 2A in that a protrusion 30 includes a protrusion 30B and a bottom ring 30R, and the ring 30R is located on the protrusion. Below 30B. As shown in FIGS. 9 and 10, the ring portion 30R surrounds and connects to the bump 30B, and forms a protruding outer edge 301 on the first surface 101. In an actual production, the annular portion 30R and the protrusion 30B are integrally formed with the main body 10. Whether it is the protrusion 20 shown in Figures 1 to 2A or the protrusion 30 shown in Figures 9 to 10, the light-emitting area of the display device can maintain high brightness and can achieve the advantages of improving brightness uniformity . ＜Related experiment＞

Several sets of related experiments and their data are listed below for the description of the examples. For the structure of the optical plate 1, please refer to the above content and Figures 1-10. In the experiment, several sets of samples are proposed, and the specifications of each sample are as follows:

Comparative Example 1-Commercially available single-sided patterned diffuser DS551A (Chi Mei Corporation), the surface centerline average roughness Ra is 3-7μm, and the thickness is 1.5mm.

Comparative Example 2—A diffuser plate has a plurality of irregular islands protruding from the surface of the substrate body. The longest platform width of the top surface of these irregular islands is 0.388~2.315mm, and the height is 23.02μm, adjacent The distance between the irregular islands is 21~433µm, and the thickness is 1.5mm.

Experimental examples 1 to 3—Optical plates as described in Figures 1 and 2A above. The related parameter series are shown in Table 1.

Brightness and uniformity of four corners:

The measurement was performed using a luminance meter of model BM-7A manufactured by TOPCON CORPORATION, and the light diffusion plates of Experimental Examples 1 to 3 and Comparative Examples 1 to 2 were set on the LED lamp during the measurement. Perform brightness measurement on the light box module set in the source array. Among them, the luminance value is a standardized value, that is, the central luminance measurement values of Comparative Examples 1 to 2 and Experimental Examples 1 to 3 are measured by the standard product (the current commercially available diffuser DS601A (Chi Mei Industrial)) 100% normalized value. The four-corner uniformity is the average of the four values after dividing the brightness of the four corners of the module by the brightness of the center of the module.

Roughness:

Use Mitutoyo's surface roughness tester (model SJ-210) to measure the surface roughness. Randomly measure the first surface roughness Ra and Rz and the second surface Ra and Rz except the protrusions, and the measuring distance is 5mm.

The outer diameter, height, inclination angle, and spacing of the protrusions:

By using the KEYENCE laser conjugate focus meter (model VK-X100 Series) as the measuring instrument, random sampling and measurement.

The above measurement results are recorded in Table 1. However, the values in Table 1 are for illustrative purposes only, and the scope of the embodiments of the present invention is not limited to the values listed in this table.

Table 1

From the data in Table 1, it can be seen that in Experimental Examples 1 to 3, the proportion of the protrusions on the first surface ranges from 0.03% to 35%, and the average roughness of the first centerline of the first surface outside the protrusions Ra is 0.01 µm~0.1µm and other characteristics, and its average four-corner uniformity is better than that of Comparative Examples 1~2, that is, the protrusion design of Experimental Examples 1~3 can make the optical plate have better uniformity performance.

In addition, from the data in Table 1, it can be seen that the optical plates of experimental examples 1 to 3 have protrusions on the first surface in the range of 0.03% to 35%, and the first surface is the first The centerline average roughness Ra is 0.01 µm~0.1µm, etc., and its 60 degree angle gloss value is better than that of Comparative Examples 1~2, that is, the protrusion design of Experimental Examples 1~3 can improve the reflectivity of oblique light. , And then make the optical plate have better uniformity performance.

Please refer to FIG. 11A, which illustrates a schematic diagram of a backlight module using the optical plate of an embodiment of the present invention. The backlight module 400 of this embodiment is, for example, a direct type backlight module suitable for flat display modules, and includes a diffuser 410, at least one light source 420 (a plurality of light sources is shown in FIG. 11A), and a frame 440. The frame defines an accommodating space 442, the diffusion plate 410 and the light source 420 are located in the accommodating space 442, and the diffusion plate 410 is placed above the light source 420. The diffusion plate 410 is, for example, the optical plate of any of the above embodiments, and includes a body 10 having a first surface 101 and a plurality of protrusions 20 on the first surface 101 and protruding from the first surface 101. In FIG. 11A, the light source 420 is disposed opposite to the first surface 101 of the diffuser plate 410. At this time, because the average roughness Ra of the center line of the first surface 101 of the diffuser plate 410 is 0.01 µm~0.1 µm, and its 60 degree angle gloss is greater than 90, the high angle incident from the light source 420 (oblique The light that enters the first surface 101 of the diffuser plate 410 is transmitted to the four corners of the diffuser plate 410 through reflection, that is, the diffuser plate 410 has high four-corner uniformity, so that the backlight module can have high brightness and uniformity degree.

In an application example, the light source 420 includes, for example, a substrate 422 and a light emitting unit 424. The light emitting unit 424 is, for example, a light emitting diode (LED) element or other types of light emitting elements and is disposed on the substrate 422. The light emitted by the light emitting unit 424 enters the diffuser plate 410 and then emits light through the second surface 102 of the diffuser plate 410, thereby forming a surface light source with high brightness and uniformity.

FIG. 11B is a schematic diagram of another backlight module using the optical plate according to an embodiment of the present invention. The difference between Fig. 11B and Fig. 11A is that the rougher surface (eg the second surface 102) of the main body 10 of the optical plate in Fig. 11B is, for example, a bite surface facing the light source 420 of the backlight module. It belongs to one of the applications of the present invention. In this embodiment, another optical film layer or optical plate can be attached to the protrusion through the colloid layer to improve the overall optical performance of the backlight module.

In one embodiment, the colloid layer uses pressure sensitive adhesives such as acrylic, polyurethane, rubber or silicone. FIG. 12A is a schematic diagram of bonding an optical plate and an optical film to which an embodiment of the present invention is applied. FIG. 12B is a schematic cross-sectional view of the optical plate and the optical film drawn along a section line 12B-12B in FIG. 12A. Please refer to Figures 12A and 12B at the same time.

In an example, the optical plate 1 of the embodiment is bonded to an optical film OP with a colloidal layer 71, where the optical film OP is, for example, disposed above the first surface 101 of the main body 10, and the colloidal layer 71 is disposed on the optical plate 1 and the optical film OP, and the colloidal layer 71 is bonded to the top surface of the protrusion 20 of the optical plate 1. As shown in FIG. 12B, the colloid layer 71 has a thickness L _ad , and there is a distance L _gap between the optical film OP and the first surface 101, and the top surface of the protrusion 20 of the optical plate 1 is trapped in the colloid layer 71 and supported The optical film OP is held, that is, the colloidal layer 71 is not directly attached to and touches the first surface 101, so an air layer 80 is formed between the first surface 101 of the main body 10 and the colloidal layer 71. In an example, the thickness L _{ad of the} colloidal layer 71 is, for example, 3-7 μm, and the distance L _gap between the bottom of the optical film OP and the first surface 101 is, for example, 10 to 42 μm. Furthermore, the air layer 80 of the embodiment is uniformly formed between the optical plate 1 and the colloidal layer 71, that is, under the entire optical film OP, between the first surface 101 of the body 10 and the bottom surface of the colloidal layer 71 Maintain approximately the same height. Compared with the optical structure in which the colloid layer 71 is directly attached to and in contact with the first surface 101, the presence of the air layer 80 can cause the light emitted from the first surface to have a larger angle of refraction, thereby enhancing the light diffusion effect.

In one embodiment, considering the thickness of the colloid layer and the design of retaining the air layer, the maximum height Hp of the protrusion 20 should be in the range of 10µm~35µm, for example, between 12µm~30µm, or 15µm~ In the range of 27 µm, this ensures that the air layer is uniformly formed between the optical plate 1 and the colloidal layer 71.

In one embodiment, when the outer diameter Dm of the protrusion is in the range of 200 µm~500 µm and the distance between two adjacent protrusions is in the range of 0.5 mm~10mm, it can effectively provide the optical film OP attached A good supporting effect can maintain approximately the same height between the first surface 101 and the bottom surface of the colloidal layer 71. In another implementation, when the proportion of the protrusions on the first surface is 0.03% to 35%, and the first centerline average roughness Ra of the first surface other than the protrusions is 0.01 µm to 0.1 µm , It can provide good support for the optical film OP and good diffusion performance of high four-corner uniformity.

In one embodiment, the protrusion structure having the apex P of the protrusion is, for example, the protrusion 20 in FIG. 2B, the protrusion in FIGS. 3A to 4C, or the protrusion in FIGS. 6A to 6C and 6F to 6H. The apex P of the protrusion can be trapped in the colloid layer 71 to produce an anchoring effect, thereby increasing the adhesion between the colloid layer 71 and the protrusion.

In one embodiment, as shown in FIG. 12C, the protrusion having a recessed portion 20R is, for example, the protrusion of FIGS. 6A to 6C or 6F to 6H (FIG. 12C shows a schematic diagram of the protrusion of FIG. 6B ), can be adjusted by the recessed portion 20R of the concave depth H _D (shown in section in FIG. 6B) to increase the proportion of the size of an air layer, even if the concave depth H _D and the maximum height Hp (first shown in FIG. 6B) The range of ratio is 15%~100%, for example, 30%~100% or 50%~90%. When the range of the ratio of concave depth H _D and the maximum height Hp falls from 15% to 100%, OP after the optical film bonded to adhesive layer 71, the recessed portion remains some space that is not in the colloid layer 71, can use this Increase the proportion of the overall air layer, once again strengthen the optical diffusion effect to enhance the overall optical performance.

Furthermore, the applicable optical film OP includes, for example, one or more diffuser films and one or more prism sheets and other multilayer optical films or microlens films and one or more Multi-layer optical film materials such as 稜鏡 layer to adjust the light angle (such as concentrated light). Although in Figures 12A to 12C, the optical film OP includes a diffuser film 73 and a layer 74 as an example, the present invention does not particularly limit the applicable optical film and/or the structure and layer of the optical film. Number or appearance.

The aforementioned backlight module 400 can be used as a backlight module of a display device, such as a TV, a notebook personal computer, a mobile computer, a monitor used in a computer, etc., or the backlight module 400 can be used directly for illumination, for example, for display. Light boxes, billboards.

In summary, the optical plate proposed in the embodiment has a protrusion with a special design as described above formed on the surface of the main body. When the optical plate of the embodiment (as shown in Figures 1 and 9) is used as a diffuser, the brightness uniformity can be improved compared with the existing diffuser. Therefore, using the optical plate of the embodiment as a diffuser can not only improve the display effect of the image, avoid the occurrence of moire interference fringes, but also reduce the number of other functional films used, reduce the manufacturing cost, and make the application display The device as a whole becomes lighter and thinner, and has extremely high application value especially for large-size display devices. In addition, when the optical plate of the embodiment is used as a diffuser and the protrusions are bonded to an optical film through a colloid, the protrusions can also support the optical film to form an air layer between the surface of the optical plate body and the colloid layer. Strengthen the overall optical diffusion effect.

To sum up, although the present invention has been invented as above by embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field to which the present invention belongs 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 subject to those defined by the attached patent application scope.

1‧‧‧Optical plate 10‧‧‧Body 101‧‧‧The first surface of the body 102‧‧‧The second surface of the body 20, 20-1, 20-2, 20-3, 20-4, 20-5 ,30‧‧‧Protrusion 20R‧‧‧Concavity 20R1‧‧‧Concavity 20R2‧‧‧Plane 20u‧‧‧Top surface 201‧‧‧Protrusion surface 30B‧‧‧Protrusion 30R‧‧‧Annular part Dp ‧‧‧Pitch Dm‧‧‧Outer diameter α‧‧‧Inclination angle H _D ‧‧‧Deep depth Hp‧‧‧Maximum height Ds‧‧‧The shortest distance between two adjacent protrusions Hm‧‧‧The body Thickness 400‧‧‧Backlight module 410‧‧‧Diffuser plate 420‧‧‧Light source 422‧‧‧Substrate 424‧‧‧Light-emitting unit 440‧‧Frame 442‧‧‧Accommodating space OP‧‧‧Optical film 71‧ ‧‧Colloid layer 73‧‧‧Diffusion film 74‧‧‧Material layer 80‧‧‧Air layer L _ad ‧‧‧The thickness of the colloidal layer L _gap ‧‧‧The distance between the optical film and the first surface P‧‧ ‧Vertex of protrusion

Figure 1 is a partial schematic diagram of an optical plate according to an embodiment of the invention. FIG. 2A is a schematic cross-sectional view of a protrusion along a cross-sectional line 2-2 in FIG. 1. FIG. Figure 2B is a schematic view of the single protrusion of Figure 1. Figures 3A to 3D show schematic diagrams of several examples where the protrusion surface is curved. Figures 4A to 4C show schematic diagrams of several examples where the protrusions are cone-shaped bumps. Figures 5A to 5C show schematic diagrams of several examples where the protrusion has a top surface. Figures 6A to 6K draw schematic diagrams of several examples in which the protrusions have recesses. Figures 7A to 7B draw schematic diagrams of protrusions with a stepped structure. FIG. 8 is a schematic diagram of a plurality of protrusions distributed on the main body of the optical plate according to an embodiment of the present invention. FIG. 9 is a partial schematic diagram of an optical plate according to another embodiment of the disclosure. FIG. 10 is a schematic cross-sectional view of another type of protrusion along a cross-sectional line 10-10 in FIG. 9. FIG. 11A is a schematic diagram of a backlight module using an optical plate according to an embodiment of the invention. FIG. 11B is a schematic diagram of another backlight module using the optical plate according to an embodiment of the present invention. FIG. 12A is a schematic diagram of bonding an optical plate and an optical film to which an embodiment of the present invention is applied. FIG. 12B is a schematic cross-sectional view of the optical plate and the optical film drawn along a section line 12B-12B in FIG. 12A. Figure 12C is a schematic cross-sectional view of another embodiment of the optical film along Figure 12B.

1‧‧‧Optical board

10‧‧‧Ontology

101‧‧‧The first surface of the body

102‧‧‧The second surface of the body

20‧‧‧Protrusion

Dp‧‧‧Pitch

Dm‧‧‧Outer diameter

Hp‧‧‧Maximum height

Ds‧‧‧The shortest distance between two adjacent protrusions

Hm‧‧‧The thickness of the body

Claims (14)

An optical plate, including: A body having a first surface; and A plurality of protrusions are located on the first surface and protrude from the first surface, and the proportion of the protrusions on the first surface of the body is 0.03% to 35%, and two adjacent protrusions There is a pitch between 0.5 mm and 10 mm, and the portion of the first surface other than the protrusions has a first centerline average roughness Ra of 0.01 μm to 0.1 μm. For the optical plate described in item 1 of the scope of patent application, one of the protrusions has an outer diameter of 200 µm to 500 µm. For the optical plate described in item 1 of the scope of patent application, the ratio of the height/outer diameter of the protrusions ranges from 0.01 to 0.2. According to the optical plate described in claim 1, wherein the protruding portions include a recessed portion formed between at least two vertices of the protruding portion. According to the optical plate described in item 1 of the scope of patent application, the protrusions have a curved surface with a radius of curvature between 300 µm and 1000 µm. The optical plate described in item 1 of the scope of the patent application is composed of a translucent resin, wherein the flexural modulus of the translucent resin is greater than 1 GPa. According to the optical plate described in item 1 of the scope of patent application, one of the protrusions includes: A bump; and An annular part is located below the convex block, and the annular part surrounds and connects with the convex block. The optical plate according to claim 1, wherein the body further has a second surface opposite to the first surface, wherein the second surface has a second centerline average roughness, and the second centerline The average roughness is greater than the first centerline average roughness. The optical plate as described in item 7 of the scope of patent application, wherein the average roughness Ra of the second center line is 4 µm ~ 8 µm. An optical structure including: The optical plate described in any one of items 1 to 9 in the scope of patent application; An optical film disposed above the first surface of the body; and A colloid layer is arranged between the optical plate and the optical film, the colloid layer is bonded to the top surfaces of the protrusions, and an air layer is arranged between the first surface and the colloid layer. An optical structure including: An optical board, including: A body having a first surface; and A plurality of protrusions protrude from the first surface, one of the protrusions has an outer diameter of 200 µm~500 µm and a maximum height of 10 µm~35 µm, and there is a gap between two adjacent protrusions One pitch is 0.5 mm~10mm; An optical film disposed above the first surface of the body; and A colloid layer is arranged between the optical plate and the optical film, the colloid layer adheres to the top surface of the protrusion, and an air layer is arranged between the first surface and the colloid layer. According to the optical structure described in claim 11, the protrusions include a recessed portion, and an air layer is provided between a bottom of the recessed portion and the colloidal layer. A backlight module includes: A light source; and For example, the optical plate described in any one of items 1 to 9 of the scope of patent application or the optical structure described in any one of items 10 to 12 of the scope of patent application is arranged corresponding to the light source. A display device includes: The optical plate described in any one of the scope of patent application 1-9 or the optical structure described in any one of the scope of patent application 10-12, wherein the display device is selected from television, A group of notebook personal computers, mobile computers, and monitors for computers.

Images