TWI449974B - Light guide plate and method for manufacturing the same - Google Patents

Description

Light guide plate and method of manufacturing same Manufacturing the same

The present invention relates to a light guide plate and a method of manufacturing the same.

In a conventional backlight module, a side-injection light source structure in which a light-emitting diode is used as a point light source can be exemplified. In such a light source structure, since a plurality of light-emitting diode systems are arranged at a predetermined interval, light emitted from each of the light-emitting diodes forms a light beam directly in front of the light-emitting diode, and adjacent light-emitting diodes The brightness between the bodies is dark. When such light enters the light guide plate, it will cause a bright and dark band on the light exit surface of the light guide plate.

In this regard, in the conventional technique, a groove is formed on the light incident side of the light guide plate to form a main microstructure of the 稜鏡 structure or the lens structure on the light incident side, thereby increasing the divergence angle of light incident on the light guide plate and slowing down. The above phenomenon of bright and dark bands. However, such a structure can only increase the divergence angle of light incident on the light guide plate, and cannot eliminate the total reflection phenomenon of light. That is, a part of the light emitted from the light source is lost due to the total reflection phenomenon and is not incident on the light guide plate.

In this regard, the present invention provides a light guide plate and a method of manufacturing the same, which can effectively reduce the total reflection of light by the nano-structure of the nanometer, avoid leakage when light is incident on the light guide plate, and increase the incidence of light to the guide. The divergence angle of the light plate slows down the phenomenon that bright and dark bands appear on the light-emitting surface of the light guide plate due to the concentration of the light beam on the front end of the light source.

In order to achieve the above object, the present invention provides a light guide plate, which is packaged The body includes a body having a light incident side, a plurality of main microstructures disposed on the light incident side, and a plurality of secondary microstructures distributed on the surface of the main microstructures. The minor dimensions of the secondary microstructures are less than 100 nm and greater than 0 nm.

In the above light guide plate, the main microstructures may be a 稜鏡 structure. At this time, the angle of the tip end of the 稜鏡 structure is preferably between 10 and 50 degrees.

In the above light guide plate, the maximum size of the secondary microstructures is preferably between 20 nm and 100 nm. The distribution of the plurality of sub-structures may be distributed in a matrix or in a honeycomb shape.

In addition, the present invention provides a method of manufacturing a light guide plate, comprising providing a body having a light incident side, forming a microstructure substrate having a first surface and a second surface opposite to the first surface, and a microstructure base The step of fixing the material to the light incident side with the second surface. The microstructured substrate forms a plurality of primary microstructures comprising a plurality of secondary microstructures on the first surface, the secondary microstructures having a maximum dimension of less than 100 nm and greater than 0 nm, distributed over the primary microstructure.

In the above manufacturing method, the step of forming the microstructured substrate includes the steps of forming the first mold and forming the second mold. The first mold is used to form a main microstructure, and the second mold is formed on the first mold to form a secondary microstructure. At this time, after the second mold is formed, it is preferable to chemically polish the second mold.

In the above manufacturing method, the step of forming the microstructured substrate may be selected from the group consisting of applying UV glue, injection, and hot press plastic forming techniques. Alternatively, the microstructured substrate can be cut after the continuous extending microstructured substrate is formed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of a light guide plate of the present invention. As shown in FIG. 1 , the light guide plate 10 includes a main body 100 having a light incident side, a plurality of main microstructures 210 disposed on the light incident side, and a plurality of sub-micro structures 220 distributed on the surfaces of the main microstructures 210 ( See Figure 3, Figure 4).

2 is an exploded perspective view of the light guide plate of FIG. 1. As shown in FIG. 2, the light guide plate 10 includes a main body 100 and a microstructure substrate 200. The main body 100 has a light incident side 101 that receives light. The main body 100 can be produced by a predetermined manufacturing method using a predetermined material according to a predetermined length, width, and thickness specification.

The microstructure substrate 200 is made of a predetermined material corresponding to the size of the body 100, preferably to be similar to the thickness and width of the light incident side 101 of the main body 100, and has a first surface 201 and a first surface. 201 is opposite the second surface 202. The first surface 201 is a side that receives the light source, and the second surface 202 is fixed to the light incident side 101.

The microstructured substrate 200 comprises a plurality of primary microstructures 210 disposed on the first surface 201. V-shaped, U-shaped or circular-arc shaped grooves are formed between the main microstructures 210, whereby the main microstructures 210 are formed as 稜鏡 structures or various other types of lens structures. At this time, the angle of the tips 203 of the main microstructures 210 is preferably between 10 and 50 degrees.

The microstructured substrate 200 further includes a plurality of sub-microstructures 220 distributed over the surface of the main microstructures 210 (see FIGS. 3 and 4). The secondary microstructures 220 are formed on the surface of the main microstructures 210 while forming the main microstructures 210 using the same material as the main microstructures 210.

3 and 4 are enlarged views of different embodiments of the sub-microstructures in the positions indicated by the dashed circles of Figs. The plurality of sub-structures 220 shown in FIG. 3 are formed in a honeycomb shape, and the plurality of sub-structures 220 shown in FIG. 4 are formed in a matrix-like matrix distribution. Each of the microstructures 220 can be a nano-scale bump or depression. 3 and 4, each of the microstructures 220 is represented by a circle, but is not limited thereto, as long as the widest distance (hereinafter referred to as the maximum size) P among the microstructures 220 is less than 100 nm and greater than 0 nm. The shape of the secondary microstructures 220 is not limited, and in addition, the maximum dimension P of each of the microstructures 220 is preferably between 20 nm and 100 nm.

As shown, the distribution of the secondary microstructures 220 may be in a matrix distribution or a honeycomb distribution, but is not limited thereto and may be other types of distribution. Regardless of the distribution pattern, the secondary microstructures 220 are preferably evenly distributed over the main microstructures 210 to evenly distribute light energy.

Hereinafter, a method of manufacturing the light guide plate of the present invention will be described.

When the light guide plate 10 of the present invention is produced, first, the main body 100 having the light incident side 101 is provided. As described above, the main body 100 can be produced by a predetermined manufacturing method using a predetermined material in accordance with a predetermined length, width, thickness, and the like.

Next, a microstructured substrate 200 is formed. The microstructured substrate 200 has a first surface 201 and a second surface 202 opposite the first surface 201. A plurality of main microstructures 210 are formed on the first surface 201. The main microstructures 210 can form various 稜鏡 structures, or various types of lens structures.

A plurality of sub-microstructures 220 are also formed on the surface of the main microstructure 210 while forming the main microstructure 210. The sub-structures 220 have a maximum dimension P of less than 100 nm and greater than 0 nm and are distributed over the main microstructures 210.

Thereafter, the microstructure substrate 200 is fixed to the light incident side 101 of the light guide plate main body 100 with the second surface 202, and the light guide plate 10 of the present invention is completed.

FIG. 5 is a schematic view showing the formation of a microstructured substrate. In detail, when the microstructured substrate 200 is formed, the steps shown in FIG. 5 are further included.

First, a substrate 700 is provided in step S10. The substrate 700 may be a metal substrate such as aluminum.

Next, a first mold 710 is formed in step S20. This first mold 710 is used to form the main microstructures 210. In this step S20, a mold of various 稜鏡 and lens structures forming the main microstructure 210 can be produced as the first mold 710 by the ultra-precision machining method.

In step S30, a second mold 720 is formed on the first mold 710. This second mold 720 is used to form the secondary microstructures 220. In this step S30, the first mold 710 may be subjected to anodization to form a nano-sized bump or recessed oxide film (only the recessed oxide film is shown in FIG. 5). The maximum size of the raised or recessed oxide films is less than 100 nm and greater than 0 nm, and preferably between 20 nm and 100 nm. At this time, the convex or depressed oxide films may be uniformly distributed according to a matrix distribution, a honeycomb distribution, or other types of distribution.

In step S40, the first mold 710 and the second mold 720 are further subjected to a chemical polishing treatment 721 to make the mold surface fine.

In step S50, a material for forming the microstructure substrate 200 is filled on the chemical polishing surface 721 by a conventional method of applying UV glue, injection, hot press molding, or the like. At this time, the main microstructure 210 is formed by the first mold 710, and also by the second mold 720 on the first mold 710, in the main microstructure 210. The surface forms a secondary microstructure 220 at the same time. After the microstructure substrate 200 is hardened and separated from the molds 710, 720, the microstructure substrate 200 is formed.

When the microstructure substrate 200 is formed according to the above steps, the microstructure substrate 200 may be formed according to the thickness and width of the light incident side 101. However, as shown in FIG. 6, after the sheet substrate 300 is formed according to the above steps, In step S60, the microstructure substrate 200 is formed by cutting the slice-shaped base material 300 in accordance with a predetermined thickness and width of the specification of the light incident side 101.

When the microstructure substrate 200 is fixed to the light incident side 101 by the second surface 202, the microstructure substrate 200 can be fixed to the light incident side 101 by a conventional method such as optical adhesive bonding.

The light guide plate 10 manufactured according to each of the above steps is formed by separately manufacturing the main body 100 and the microstructure substrate 200, but the main microstructure 210 and the sub-micro structure 220 may be formed directly on the light incident side 101 of the main body. In the case of such a manufacturing method, the main microstructure 210 and the sub-micro structure 220 can be directly formed on the main body 100, and the process of designing and fixing the main body 100 corresponding to the size of the microstructure substrate 200 can be omitted, and the process can be further shortened. And eliminating the loss of light at the interface of the body 100 and the microstructured substrate 200.

As described above, according to the light guide plate of the present invention, the total reflection of light can be effectively reduced by the secondary microstructure, the leakage of light when the light is incident on the light guide plate is avoided, and the divergence angle of the light incident on the light guide plate is increased, Slow down the phenomenon that the light beam is concentrated on the front end of the light source, causing bright and dark bands on the light-emitting surface of the light guide plate.

10‧‧‧Light guide plate

100‧‧‧ Subject

101‧‧‧light side

200‧‧‧Microstructured substrate

300‧‧‧Sheet substrate

201‧‧‧ first surface

202‧‧‧ second surface

203‧‧‧ cutting-edge

210‧‧‧Main microstructure

220‧‧‧ microstructures

700‧‧‧Substrate

710‧‧‧First mould

720‧‧‧second mold

721‧‧‧Chemical polishing

P‧‧‧Maximum size

Dimensions (length, width, thickness, etc.) of each component shown in the following figures It is merely a schematic representation, and the actual size of each component can be appropriately determined as needed within the numerical range defined in the following claims.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of a light guide plate of the present invention.

2 is an exploded perspective view of the light guide plate of FIG. 1.

Fig. 3 is an enlarged view showing an example of a secondary microstructure.

Figure 4 is an enlarged view of another example of a secondary microstructure.

Figure 5 is a schematic illustration of the formation of a microstructured substrate.

Figure 6 is a schematic illustration of a cut microstructure substrate.

200‧‧‧Microstructured substrate

220‧‧‧ microstructures

P‧‧‧Maximum size

Claims (10)

A light guide plate comprising: a main body having a light incident side; a plurality of main microstructures disposed on the light incident side, wherein the main microstructures comprise edges having a tip angle of between 10 and 50 degrees a mirror structure; and a plurality of sub-microstructures distributed on the surface of the main microstructures, the sub-micro structures having a maximum dimension of less than 100 nm and greater than 0 nm. The light guide plate of claim 1, wherein the maximum size of the secondary microstructures is between 20 nm and 100 nm. The light guide plate of claim 1, wherein the distribution of the secondary microstructures is distributed in a matrix. The light guide plate of claim 1, wherein the distribution of the secondary microstructures is a honeycomb distribution. A method of manufacturing a light guide plate, comprising the steps of: providing a main body having a light incident side; forming a microstructure substrate having a first surface and opposite to the first surface a second surface forming a plurality of main microstructures including a plurality of sub-structures on the first surface, the main microstructures comprising a crucible structure having a tip angle of between 10 and 50 degrees, and The microstructure has a maximum dimension of less than 100 nm and greater than 0 nm and is distributed over the main microstructures; The microstructured substrate is fixed to the light incident side by the second surface. The manufacturing method of claim 5, wherein the step of forming the microstructure substrate comprises the steps of: forming a first mold to form the main microstructures; and forming a second mold on the first mold Used to form the secondary microstructures. The manufacturing method of claim 6, wherein the second mold is further chemically polished after the second mold is formed. The manufacturing method of claim 5, wherein the microstructure substrate is further cut. The manufacturing method according to any one of claims 5 to 8, wherein the minor microstructures have a maximum size of between 20 nm and 100 nm. The manufacturing method according to any one of claims 5 to 8, wherein the step of forming the microstructured substrate is selected from the group consisting of UV-coated, injection, and hot-press plastic forming techniques.