TWI481914B - An optical plate with microstructures - Google Patents

Description

Micro-structured optical plate

The present invention relates to an optical plate, and more particularly to an optical plate having a microstructure on its surface.

Generally, a non-self-illuminating display device converts a light source (line light source or point light source) into a high-brightness and uniform light-emitting surface light source by using a backlight module as a light source of the display. Referring to FIG. 1 , a side-lit backlight module is used as an example. The backlight module includes a light guide plate 11 and a light source 12 . The light guide plate 11 has a light transmissive layer 111 , and a light transmissive layer 111 is formed on the light transmissive layer 111 . The upper microstructure 13 serves as a light-emitting surface, and the light source 12 is formed on one side 112 of the light-transmitting layer 111. The light emitted from the light-emitting surface is made to have a high-brightness and uniform surface light source by changing the direction of travel of the light emitted from the light source 12 by the microstructure 13.

At present, there are a plurality of ways for fabricating the light guide plate having a microstructure. For example, US Pat. No. 6,199,994 discloses a light guide plate having a microstructure formed by printing, the microstructure being formed on the light exit surface of the light guide plate. a light suppression region disposed on the light exiting surface adjacent to the incident surface thereof, a light enhancement region respectively disposed at both ends of the light suppression region, and a light control region disposed on a side away from the incident surface, thereby having The different types of microstructures allow the light emitted from the light guide plate to have a high uniformity; or the Republic of China Patent Publication No. 200602189 discloses a resin which is formed by injection molding by means of a mold having a microstructured pattern. Injecting the mold core, transferring the microstructure pattern to obtain a light guide plate having a microstructure, or A template having a microstructure pattern is hot-embossed on the surface of a resin molded sheet by hot stamping, or the microstructure pattern can be transferred to obtain the light guide sheet having a microstructure.

Wherein, the microstructure is formed by hot stamping, and when the microstructure of the mold/template is more and more fine, not only the microstructure of the mold/template is difficult to process, but also because of subsequent injection molding. Or the improper control of the conditions of the hot stamping, so that the transfer rate of the mold/template microstructure is lowered, and the light guide plate having the desired microstructure cannot be formed; in addition, since it is heated to the glass close to the resin during the imprinting Conversion temperature or melting point, so the embossing will result in poor transfer rate due to insufficient support of the resin itself, which will also cause defects in the microstructure of the light guide plate and reduce the light homogenization effect of the backlight module. .

Therefore, how to provide a light guide plate with a high transfer rate and a structurally complete microstructure is a continuously improved direction for those skilled in the art.

Accordingly, it is an object of the present invention to provide an optical sheet which is simple in process and which can have a high transfer rate and high surface microstructure integrity.

Accordingly, the present invention provides an optical plate having a microstructure on the surface, comprising a laminate, and a plurality of microstructures.

The laminate is permeable to light, comprising a first base layer and a second base layer formed on the surface of the first base layer, the first base layer is composed of a first resin layer, and the second base layer is composed of a second layer The resin has a glass transition temperature of Tg ₁ and Tg _{2 of} the first and second resins, and 5 ° C ≦ Tg ₁ - Tg ₂ ≦ 17 ° C.

The second base layer has a plurality of microstructures that protrude upward and extend in parallel in a direction opposite to the first base layer to guide a path of travel of the light.

Preferably, the first and second resins have glass transition temperatures of Tg ₁ and Tg ₂ , respectively, and 7 ° C ≦ Tg ₁ - Tg ₂ ≦ 15 ° C.

Preferably, the microstructures are triangular prismatic, semi-cylindrical, hemispherical, or the truncated triangular prismatic, tapered, hemispherical top surface has an arcuate concave surface.

Preferably, any two adjacent microstructures have a valley between the vertical sections, and the connection line connecting any two adjacent valleys is a reference line, and each of the microstructures has a surface defining the highest surface of each of the microstructures. It is a vertex with a maximum vertical distance H between the vertex and the reference line, 5 μm < H < 50 μm.

Preferably, there is a maximum vertical distance H between the vertex and the reference line, 10 μm < H < 25 μm.

Preferably, there is a maximum vertical distance H between the vertex and the reference line, 15 μm < H < 23 μm.

Preferably, the distance between the highest points of the surfaces of any two adjacent microstructures is S, 40 μm < S < 90 μm.

Preferably, the distance between the highest points of the surfaces of the two adjacent microstructures is S, 50 μm<S<80 μm.

Preferably, the distance between the highest points of the surfaces of the two adjacent microstructures is S, 55 μm<S<75 μm.

Preferably, the first base layer has a thickness of 0.45 mm to 5 mm, and the second base layer has a thickness of 80 μm to 200 μm.

Preferably, the first resin and the second resin are respectively selected from the group consisting of an acrylate resin, a methacrylate resin, a polystyrene resin, a polycarbonate resin, a methyl methacrylate-styrene copolymer, An acrylonitrile-styrene copolymer, polyethylene terephthalate, and a combination of the foregoing.

Preferably, the laminate has a thickness of 0.5 to 5.2 mm.

Preferably, the first base layer has a bottom surface opposite to the microstructures, and the optical plate further has a plurality of reflective structures disposed on the bottom surface.

Preferably, the reflective structure is formed by a plurality of bump structures protruding from the bottom surface or a plurality of recess structures recessed from the bottom surface.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to FIG. 2, a preferred embodiment of the microstructured optical plate of the present invention comprises: a laminate 2 having a light transmissive property, comprising a first base layer 21 and a second layer having a plurality of microstructures 3 The base layer 22, each of the microstructures 3, has a surface 31. The first base layer 21 is composed of a first resin layer having a first base layer surface 211 and a bottom surface 212 opposite to the first base layer surface 211. The second base layer 22 is composed of a second resin and is connected thereto. a first base layer surface 211 having a plurality of microstructures 3 extending upward and parallel in a direction opposite to the first base layer 21; wherein the glass transition temperatures of the first and second resins are respectively Tg ₁ And Tg ₂ and 5 ° C ≦ Tg ₁ - Tg ₂ ≦ 17 ° C; preferably, 7 ° C ≦ Tg ₁ - Tg ₂ ≦ 15 ° C.

In detail, the first and second resins are each selected from a light-permeable thermoplastic resin, for example, an acrylate resin, a methacrylate resin, a polystyrene resin, a polycarbonate resin, and a methyl group. a methyl acrylate-styrene copolymer, an acrylonitrile-styrene copolymer, polyethylene terephthalate, and a combination thereof, and the first and second resins may be the same or different materials. The above-mentioned acrylate-based resin and methacrylate-based resin are polymers formed of a methacrylate-based monomer and an acrylate-based monomer, for example, polymethyl methacrylate (PMMA). The above acrylate monomer and methacrylate monomer include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl acrylate, methyl acrylate, ethyl acrylate A monomer such as isopropyl acrylate, wherein a methyl methacrylate monomer and a methyl acrylate monomer are preferred.

Preferably, in order to make the first base layer 21 and the second base layer 22 have better optical properties, the first resin and the second resin are selected from the group consisting of the same materials, for example, all of the methacrylate resin and the poly a styrene resin, or a polycarbonate resin; the thickness of the laminate 2 is the maximum vertical distance between the surface 31 of the microstructure 3 and the bottom surface 212 of the first substrate 21; the thickness of the second substrate 22 is the microstructure a maximum vertical distance between the surface 31 of the 3 and the first base layer 211; the thickness of the first base layer 21 is the maximum vertical distance between the first base layer surface 211 and the bottom surface 212 of the first base layer 21; The light transmittance of the laminate 2 and the reduction of the light reflected by the internal reflection of the laminate 2 detract from the light intensity. Preferably, the thickness of the laminate 2 is 0.5 mm to 5.2 mm, and the thickness of the first base layer 21 is 0.45 mm to 5 mm, and the thickness of the second base layer 22 is 80 μm to 200 μm.

It is to be noted that the laminate 2 may also be a three-layer or three-layer multilayer structure in which a resin having different glass transition temperatures is laminated, and the resin material of the multilayer structure is selected from a layer body in which the microstructures 3 are pre-formed. The glass transition temperature is Tg ₁ , and the glass transition temperature of the layer farthest from the microstructures 3 is Tg ₂ , and 5 ° C ≦ Tg ₁ -Tg ₂ ≦ 17 ° C, and the materials of the remaining layers control the glass transition temperature. It is only between the Tg ₁ and the Tg ₂ .

The microstructures 3 are upwardly convex and extend in parallel in a direction opposite to the first base layer 21.

Referring to FIG. 2, in detail, the protruding microstructures 3 may be triangular prisms, semi-spherical, cylindrical, or truncated triangular columns, or the above-mentioned truncated triangular columnar, semi-cylindrical tops. The surface has an arc-shaped concave surface and the like having a high refractive effect on the light for guiding and changing the traveling direction of the light, and the shape design and the change of the microstructures 3 increase the light when contacting the microstructures 3 The refracting effect can be used to enhance the light uniformity of the optical plate. In the embodiment, the microstructures 3 are illustrated by a triangular column as shown in FIG.

Referring to FIG. 3, any two adjacent microstructures 3 have a valley between the vertical sections, and a connecting line defining any two adjacent valleys is a reference line L. Each of the microstructures 3 has a surface 31 defining each micro. The highest point of the surface 31 of the structure 3 is a vertex, and the maximum vertical distance H between the vertex of each of the microstructures 3 and the reference line L is preferably 5 μm < H < 50 μm; more preferably, 10 μm < H < 25 μm, more preferably 15 μm < H < 23 μm.

Preferably, the distance between the vertices of any two adjacent microstructures 3 is S, 40 μm < S < 90 μm.

Preferably, the distance between the vertices of the two adjacent microstructures 3 is S, 50 μm<S<80 μm.

Preferably, the distance between the vertices of the two adjacent microstructures 3 is S, 55 μm<S<75 μm.

When the maximum vertical distance H between the apex of each of the microstructures 3 and the reference line L is between 5 μm<H<50 μm, and the distance between the vertices of any two adjacent microstructures 3 is S, 40 μm<S<90 μm, And the shape of the microstructures 3 is a truncated triangular columnar, tapered, hemispherical top surface having an arcuate concave surface, which can increase the light exit angle of the optical plate and increase the degree of light mixing between the adjacent microstructures 3, and The uniformity of light of the entire optical plate can also reduce the hotspot problem of the light incident surface (that is, the light source side).

When the optical plate is used as the light guide plate of the conventional backlight module, the light source (for example, a lateral backlight module) enters the laminated layer 2 from one side of the laminated layer 2, and is refracted toward the optical plate. The light emitting surface (ie, the surface 31 of the microstructures 3) is emitted, and the surfaces 31 of the microstructures 3 disposed on the upper surface 221 can be used to change and guide the traveling direction of the light emitted from the light source, and The light emitted from the light-emitting surface becomes a surface light source having high brightness and uniformity.

The manufacturing method of the preferred embodiment of the optical plate of the present invention will be described below.

Referring to FIG. 4, first, a first resin having a glass transition temperature of Tg _{1 and} a second resin having a glass transition temperature of Tg ₂ are selected, and Tg ₁ >Tg ₂ ; The resin is heated and pressurized by different extrusion devices, and then extruded to obtain a first substrate 101 and a second substrate 102, and then the first and second substrates 101 and 102 are heated together by the same die 400. Pressing and pressing, the first and second substrates 101, 102 are overlapped with each other to obtain a laminate 100, and then the laminate 100 is passed through a roller transfer device, and the laminate is transferred by a roller. The micro-structures 3 are formed. The laminated material 100 is cooled to form a laminate 2 formed by the first base layer 21 and the second base layer 22, and is pulled by a traction roller (not shown) to obtain the optical plate.

In detail, the wheel transfer device has at least one transfer roller 200 and at least one first back pressure roller 300 disposed in a gap P with the transfer roller 200, and is a transfer roller 200 in FIG. A first back pressure roller 300 and a second back pressure roller 301 disposed at a position downstream of the transfer roller 200 are taken as an example. The wheel surface of the transfer roller 200 has a plurality of transfer microstructures 202. The adjacent two transfer microstructures 202 jointly define a molding space 201. The molding spaces 201 are related to the microstructures to be transferred. 3 cooperate with each other, for example, when the microstructure 3 to be transferred is a triangular prism shape, the molding space 201 has a plurality of triangular prism-shaped recesses; when the microstructure 3 to be transferred is convex The stripe shape is elongated or semi-cylindrical, and the molding space 201 is a plurality of recesses having a tapered column or a semi-cylindrical shape.

When the laminated material 100 is to be imprinted to form the microstructures 3, the laminated material 100 must pass through the gap P between the transfer roller 200 and the first back pressure roller 300, and be smaller than the first substrate. Under the condition of the glass transition temperature Tg ₁ of 101, the laminated material 100 is formed into a relative rolling pressure by the transfer roller 200 and the first back pressure roller 300, and the structure of the molding space 201 can be transferred to the laminated material. 100, and an optical plate as shown in Fig. 3 was obtained.

It should be noted that, in order to smoothly obtain the microstructure 3 having a high transfer rate in the laminated material 100 by the roller transfer method, the side of the laminated material 100 having a lower glass transition temperature must be oriented when the roller is transferred. The other surface of the transfer roller 200 having a high glass transition temperature faces the first back pressure roller 300. In this embodiment, the second substrate 102 faces the transfer roller 200, and the first substrate 101 is oriented toward the first back pressure roller 300, whereby the second substrate 102 has a relatively low glass transition temperature when the roller is transferred, so that it can be easily formed during transfer; The heating temperature at the time of writing is controlled to be lower than the glass transition temperature Tg _{1 of} the first substrate 101, so that the first substrate 101 can serve as a support material while being subjected to the pressing of the second substrate 102. The stress of the writing process maintains the flatness of the second substrate 102, so that the molding spaces 201 can be more completely transferred to the second substrate 102.

The temperature of the transfer roller 200 is preferably 90 ° C ~ 110 ° C, and the temperature of the first back pressure roller 300 is preferably 70 ° C ~ 90 ° C, in addition to at least one second back pressure roller position 301 is located downstream of the transfer roller 200, and has a temperature of 100 ° C to 130 ° C, at least one transport roller (not shown) and at least one take-up roller (not shown) to drive the optical plate. The material of the above rollers is not limited, and may be made of metal, rubber or the like. In addition, the position of the transfer roller 200 may be placed at a position downstream of the second back pressure roller position 301, that is, the first back pressure roller 300, the second back pressure roller position 301, and the transfer roller 200 are sequentially arranged. The laminate 100 passes the first back pressure The gap between the roller 300 and the second back pressure roller 301. When the laminated material 100 passes through the transfer roller 200 and the second back pressure roller 301, it still needs to be in a high temperature state and has flexibility to pass through in a curved shape. Therefore, if the temperature of the rollers is too low, the laminated material 100 will be cooled to easily cause cracks during transportation, and if the temperature of the roller is too high, the fluidity of the laminated material 100 is too high, which is not conducive to the formation of the microstructure 3. .

In order to obtain a microstructure with a high transfer rate, the speed of the transfer roller 200 is preferably 1 to 20 meters per minute, more preferably 2 to 10 meters per minute, and most preferably 3 to 5 meters per minute. Preferably, the depth of the cavity of the molding space 201 is A, the depth A ranges from 30 μm<A<100 μm, and the width is B, and the width B ranges from 40 μm<B<120 μm.

More preferably, the surface-structured optical plate of the present invention is suitable for a microstructure having a microstructure height of 5 μm<H<50 μm and a maximum distance of 40 μm<S<90 μm between the highest points of the adjacent two microstructures, and has High transfer rate and high surface microstructure integrity.

It is to be noted that the optical plate of the present invention may further have a plurality of reflective structures (not shown) disposed on the bottom surface 212 of the first base layer 21. The reflective structure may be a plurality of recessed structures extending from the bottom surface 212 of the first base layer 21 toward the second base layer 22, or a plurality of convex structures extending from the bottom surface 212 away from the microstructures 3.

The microstructures 3 and the reflective structures may be in the process of the roller transfer process, using the transfer roller 200 having the transfer microstructures 202 and having a plurality of transfer structures coupled with the reflective structures (not shown) The first back pressure roller 300 is formed simultaneously with the rolling, or can also be screen printed. The bottom surface 212 forms a convex reflective structure.

It is to be noted that when the reflective structures are recessed, the microstructures 3 and the reflective structures can utilize the transfer roller 200 having the transfer microstructures 202 and have many during the roller transfer process. The first back pressure roller 300 of the convex transfer structure (not shown) which cooperates with the reflective structures is formed simultaneously with the rolling, and the reflection structures of the recesses not only further increase the refraction effect on the light The intensity and uniformity of the emitted light are increased, and during the hot press forming, the reflective structures also form a back pressure effect, so that the second resin is more easily squeezed into the molding spaces 201, which is more advantageous for the micro-refraction. The formation of structure 3 can improve the transfer rate of the write-transfer microstructure.

The transduction rate of the optical plate having a microstructure on the surface of the present invention is determined by taking the microstructured optical plate by about 1 cm as a measurement sample, and the sample is placed under an optical microscope to measure the microstructures 3 of the optical plate. The maximum vertical distance H between the surface 31 and the reference line L, and the depth A of the forming space recess of the transfer roller 200, define the ratio of the maximum vertical distance H to the depth A of the forming space pocket (H/A) For the transfer rate.

The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the specific examples and the accompanying drawings. However, it should be understood that the specific examples are only illustrative. It should not be construed as limiting the practice of the invention.

Specific example

The polystyrene resins having different glass transition temperatures were selected as the first and second resins, respectively, and a roller transfer device was prepared.

The first resin: manufactured by Chi Mei Industrial Co., Ltd., product name ACRYREX CM-205, Tg ₁ = 115 °C.

The second resin: manufactured by Chi Mei Industrial Co., Ltd., product name ACRYREX CM-211, Tg ₂ = 103 ° C is the second resin, Tg ₁ - Tg ₂ = 12 ° C.

As shown in FIG. 4, the roller transfer device has a transfer roller and a first back pressure roller disposed at a position opposite to the transfer roller, and a downstream position of the transfer roller The second back pressure roller is arranged in the order of the first back pressure roller, the transfer roller and the second back pressure roller, wherein the transfer roller has a plurality of molding spaces, and the molding space pockets The depth is A = 60 μm, and the width is B = 100 μm of the inverted triangular column-shaped recess. The temperature of the first back pressure roller is 80 ° C, the temperature of the transfer roller is 100 ° C, and the temperature of the first back pressure roller is 80 ° C, and the temperature of the second back pressure roller is 120 ° C, at least one The conveying roller and at least one take-up roller drive the movement of the optical plate.

First, the first resin is heated and pressurized by a first extruding device, and then extruded (extrusion temperature=230° C.) to obtain a first substrate, and then the second resin is heated and pressurized by a second extruding device and then extruded ( The extrusion temperature = 220 ° C), a second substrate is obtained, and then the first substrate and the second substrate are co-heated by the same die, so that the first substrate and the second substrate are overlapped with each other. a laminated material is obtained; then, the second substrate is oriented toward the transfer roller, and the laminated material is passed through the gap between the first back pressure roller and the transfer roller, and the transfer roller and the The first back pressure roller forms a relative rolling pressure on the laminated material, so that a plurality of triangular columnar microstructures opposite to the shape of the triangular prism-shaped recesses can be formed on the second substrate, and the first substrate is cooled. Forming the first base layer, and the second substrate forms the second base layer, thereby obtaining The surface has a microstructured optical plate, and the maximum vertical distance H between the apex of each microstructure and the reference line is 35 μm, and the spacing S between the vertices of any two adjacent microstructures is 100 μm. The first base layer has a thickness of 2.85 mm, the second base layer has a thickness of 150 μm, and the laminate has a thickness of 3 mm. The microstructure transfer rate of the optical plate was measured to be 58% (H/A = 35 μm / 60 μm × 100%).

<Comparative example>

The difference from the manufacturing method of the specific example described above is that the first and second base layers of the comparative example are made of the same resin (manufactured by Chimei Industrial Co., Ltd., product name ACRYREX CM-205, Tg ₁ = 115 ° C), and thus obtained. The surface has a microstructured optical plate, the maximum vertical distance H between the apex of each microstructure and the reference line is 9 μm, the pitch S of the apexes of any two adjacent microstructures is 100 μm, and the thickness of the optical plate is 3 mm. The microstructure transfer rate of the optical plate was measured to be 15% (H/A = 9 μm / 60 μm × 100%).

It can be seen from the measurement results of the transfer rate of the specific example and the comparative example that the optical plate having a microstructure on the surface of the present invention has not only easy process control, high transfer rate, but also high structural integrity of the microstructures. These microstructures effectively enhance the light uniformity of the optical plate.

In summary, the optical sheet of the present invention utilizes the first base layer 21 and the second base layer 22 having different glass transition temperatures as the main body constituting the optical sheet, and the second base layer having a lower glass transition temperature. The micro-structure 3 capable of changing the traveling direction of the light is formed by the wheel transfer method. The optical plate can be applied to the light guide plate of the general display backlight module or used as a light-enhancing plate, which is not only simple in process, but also has high transfer rate and The light-expanding effect of the optical plate can be effectively improved, so that the purpose of the invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Laminated materials

101‧‧‧First substrate

102‧‧‧Second substrate

200‧‧‧Transfer wheel

201‧‧‧Forming space

202‧‧‧Transfer microstructure

300‧‧‧First back pressure roller

301‧‧‧Second back pressure roller

400‧‧‧die

P‧‧‧ gap

2‧‧‧Layer

21‧‧‧ first grassroots

211‧‧‧ First base surface

212‧‧‧ bottom

22‧‧‧ second base

3‧‧‧Microstructure

31‧‧‧ surface

H‧‧‧Vertical distance

S‧‧‧ spacing

L‧‧‧ baseline

1 is a schematic view showing the structure of a conventional backlight module; FIG. 2 is a schematic view showing different aspects of the microstructure of the present invention; and FIG. 3 is a schematic view showing a preferred embodiment of the optical plate of the present invention; 4 is a flow diagram illustrating the manufacturing process of the preferred embodiment of the present invention.

2‧‧‧Layer

21‧‧‧ first grassroots

211‧‧‧Microstructured surface

212‧‧‧ bottom

22‧‧‧ second base

3‧‧‧Microstructure

31‧‧‧ surface

H‧‧‧Vertical distance

S‧‧‧ spacing

L‧‧‧ baseline

Claims (14)

An optical plate having a microstructure having a surface, comprising: a light transmissive laminate comprising a first base layer and a second base layer formed on the surface of the first base layer, and the second base layer has a plurality of the first base layer a microstructure in which the opposite direction protrudes upward and extends in parallel, wherein the first base layer is composed of a first resin layer, and the second base layer is composed of a second resin, and the glass transition temperatures of the first and second resins are respectively Tg ₁ and Tg ₂ , and 5 ° C ≦ Tg ₁ - Tg ₂ ≦ 17 ° C. The surface-structured optical plate according to claim 1, wherein the first and second resins have glass transition temperatures of Tg ₁ and Tg ₂ , respectively, and 7 ° C ≦ Tg ₁ - Tg ₂ ≦ 15 ° C . The surface-structured optical plate according to claim 1, wherein the microstructures are triangular columns, semi-cylindrical, semi-spherical, or truncated triangular columns, or the truncated triangular column and semi-cylindrical shape. The top surface has an arcuate concave surface. The surface-structured optical plate according to claim 1, wherein any two adjacent microstructures have a valley between the vertical sections, and a connection line connecting any two adjacent valleys is a reference line. Each of the microstructures has a surface defining a top surface of each of the microstructures as a vertex having a maximum vertical distance H between the vertices and the reference line, 5 μm < H < 50 μm. The surface-structured optical sheet of claim 4, wherein 10 μm < H < 25 μm. Microstructured optics according to item 4 of the patent application scope Plate, where 15 μm < H < 23 μm. The surface-structured optical plate according to claim 5, wherein a pitch S of any two adjacent microstructures is 40 μm<S<90 μm. The surface-structured optical plate according to Item 7 of the patent application, wherein 50 μm<S<80 μm. The surface-structured optical plate according to item 8 of the patent application, wherein 55 μm < S < 75 μm. The optical micro-structured optical sheet according to claim 1, wherein the first base layer has a thickness of 0.45 mm to 5 mm, and the second base layer has a thickness of 50 μm to 200 μm. The surface-structured optical plate according to claim 1, wherein the first resin and the second resin are respectively selected from the group consisting of an acrylate resin, a methacrylate resin, a polystyrene resin, and a poly A carbonate resin, a methyl methacrylate-styrene copolymer, an acrylonitrile-styrene copolymer, polyethylene terephthalate, and a combination of the foregoing. The optical plate having a microstructure on the surface according to claim 1, wherein the laminate has a thickness of 0.5 mm to 5.2 mm. The surface-structured optical plate of claim 1, wherein the first base layer has a bottom surface opposite to the microstructures, and the optical plate further has a plurality of reflective structures disposed on the bottom surface. The surface-structured optical plate of claim 13, wherein the reflective structure is formed by a plurality of bump nodes protruding from the bottom surface. The structure is formed by a plurality of recessed structures recessed from the bottom surface.