TW201903487A - Backlight module - Google Patents

Abstract

A backlight module includes a light guide plate, multiple lenticular structures, and an optical material. The light guide plate has at least one light incident surface and a light emitting surface, and the light emitting surface has a first region adjacent to the light incident surface and a second region adjoining the first region and spaced away from the light incident surface. The lenticular structures are disposed on the first region and the second region. Each lenticular structure has a refraction surface, and each two adjacent refraction surfaces define a gap therebetween. The optical material is filled in the gaps formed in the first region.

Description

   Backlight module   

The invention relates to a backlight module.

In the current backlight module design, microstructures are usually formed on the surface of the light guide plate to improve the brightness of the light guide plate, thereby increasing the overall brightness of the backlight module. For example, as shown in FIG. 1, the columnar microstructures 104 formed on the light guide plate 102 can reduce the light angle and improve the utilization efficiency of the light source 106 by the principle of refraction, so that the brightness of the light guide plate 102 is increased. However, the refracting and condensing effect of the columnar microstructures 104 tends to make the distribution of bright and dark bands on the light incident side of the light guide plate 102 more obvious, resulting in a decrease in the uniformity of the light output of the light guide plate 102.

The "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" paragraph may include some conventional technologies that do not constitute the ordinary knowledge of those skilled in the art. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a backlight module design that can reduce the distribution of bright and dark bands on the light-incident side and improve the uniformity of light output.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention.

In order to achieve one or some or all of the above or other objectives, a backlight module according to an embodiment of the present invention includes a light guide plate, a plurality of columnar microstructures, and an optical material. The light guide plate has at least one light incident surface and a light emitting surface. The light emitting surface has a first region adjacent to the light incident surface and a second region far from the light incident surface and adjacent to the first region. The plurality of columnar microstructures are disposed at least in the first region and the second region of the light emitting surface. Each columnar microstructure has a microstructure surface, and a gap is formed between two adjacent microstructure surfaces. The optical material fills the gap in the first region.

In one embodiment, the filling height of the optical material in the gap is flush with the apex of the adjacent microstructure surface, and the optical material may be, for example, a printing ink or an optical coating.

In an embodiment, a major axis direction of each of the columnar microstructures may be substantially perpendicular to the light incident surface, and each of the columnar microstructures may be substantially parallel to each other.

Another embodiment of the present invention provides a backlight module including a light guide plate, a plurality of columnar microstructures, and an optical material. The light guide plate has at least one light incident surface and a light emitting surface. The light emitting surface has a first region adjacent to the light incident surface and a second region far from the light incident surface and adjacent to the first region. The plurality of columnar microstructures having the same shape are disposed at least in the first region and the second region of the light emitting surface. The optical material is coated on a first region provided with a columnar microstructure.

Another embodiment of the present invention provides a backlight module including a light guide plate, a plurality of first columnar microstructures, and a plurality of second columnar microstructures. The light guide plate has at least one light incident surface and a light emitting surface. The light emitting surface has a first region adjacent to the light incident surface and a second region far from the light incident surface and adjacent to the first region. The plurality of first columnar microstructures are disposed in a first region of the light emitting surface, and the plurality of second columnar microstructures are disposed in a second region of the light emitting surface. Each first columnar microstructure has a different shape from each second columnar microstructure, and the light scattering ability of each first columnar microstructure is greater than the light scattering ability of each second columnar microstructure.

In one embodiment, a hot-pressed, laser, or etched surface is formed on the first columnar microstructure.

With the design of each of the above embodiments, the surface treatment of the columnar microstructures adjacent to the light incident side, such as changing the microstructure shape by surface processing or filling the microstructure surface with optical materials, can partially adjust the light surface The light scattering effect in different areas achieves the purpose of reducing the distribution of bright and dark bands adjacent to the light incident surface and improving the uniformity of light output in a relatively simple manner.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, embodiments are described in detail below with reference to the accompanying drawings, as follows.

10‧‧‧ backlight module

12‧‧‧light guide

12a‧‧‧Glass entrance

12b‧‧‧light surface

14‧‧‧ Columnar Microstructure

14a‧‧‧microstructured surface

16‧‧‧ Optical Materials

18‧‧‧ light source

102‧‧‧light guide

104‧‧‧Columnar microstructure

106‧‧‧light source

L‧‧‧ Long axis direction

P‧‧‧First Zone

Q‧‧‧Second Zone

S‧‧‧ Clearance

V‧‧‧ Vertex

FIG. 1 is a schematic diagram of a conventional backlight module.

FIG. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the present invention.

3 is a schematic perspective view of a light guide plate and a columnar microstructure formed on the light guide plate according to an embodiment of the present invention.

FIG. 4A and FIG. 4B are schematic diagrams showing different microstructure surface morphologies of different regions of the light exit surface of the light guide plate according to an embodiment of the present invention.

5A and FIG. 5B are schematic diagrams showing different microstructure surface morphologies of different regions of the light exit surface of the light guide plate according to another embodiment of the present invention.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

FIG. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the present invention. 3 is a schematic perspective view of a light guide plate and a columnar microstructure formed on the light guide plate according to an embodiment of the present invention. As shown in FIGS. 2 and 3, a backlight module 10 includes a light guide plate 12, a plurality of columnar microstructures 14, and an optical material 16. The light guide plate 12 has at least one light incident surface 12 a and a light exit surface 12 b, and the light incident surface 12 a is adjacent to a light source 18. The light emitting surface 12b has a first region P adjacent to the light incident surface 12a, and a second region Q far from the light incident surface 12a and adjacent to the first region P. Please refer to FIG. 2 and FIG. 3 at the same time. In this embodiment, the plurality of columnar microstructures 14 are disposed at least in the first region P and the second region Q of the light emitting surface 12b. Each columnar microstructure 14 has a microstructure surface ( The light-refracting surface) 14a can extend to both sides of the light guide plate 12 along the long axis direction L, and a gap S is formed between every two adjacent microstructure surfaces 14a. In this embodiment, each of the plurality of columnar microstructures 14 on the light emitting surface 12b may have substantially the same shape, and the optical material 16 may only fill the gap S of the first region P adjacent to the light incident surface 12a. Therefore, comparison 4A and 4B, compared with the second region Q (FIG. 4A) in which the optical material 16 is not filled in the gap S, the first region P (FIG. 4B) in which the optical material 16 is filled in the gap S can increase the number of light reflections and Improve the light scattering effect, make the light mixing more uniform, reduce the distribution of bright and dark bands adjacent to the light incident surface 12a, and improve the light uniformity of the light guide plate 12.

It should be noted that the material and the filling method for filling the columnar microstructure gap S with the optical material 16 are not limited at all. In one embodiment, the optical material 16 can be coated on the first region P provided with the columnar microstructures 14 by using printing ink or optical coating, but the present invention is not limited thereto. Furthermore, in an embodiment, the filling height of the optical material 16 in the gap S may be flush with the vertex V of the adjacent microstructure surface 14a as shown in FIG. 4B, but the present invention is not limited thereto. In one embodiment, the major axis direction L of each of the columnar microstructures 14 may be substantially perpendicular to the light incident surface 12 a, and each of the columnar microstructures 14 may be substantially parallel to each other, for example. Furthermore, although the columnar microstructure 14 illustrated in FIG. 3 has a cross-sectional profile of a curved surface, it is not limited, and the columnar microstructure 14 may also have a triangular or other cross-sectional profile.

In another embodiment, surface processing may be performed on the columnar microstructures 14 adjacent to the first area P of the light incident surface 12a by hot pressing, laser, or etching, so that the first microstructures 14 adjacent to the light incident surface 12a may be surface processed. The shape of the columnar microstructure of the region P (as shown in FIG. 5B) and the columnar microstructure of the second region Q located farther from the light incident surface 12 a (as shown in FIG. 5A) are different. Since the columnar microstructures 14 in the first region P are subjected to a surface treatment such as hot pressing, laser, or etching, their light scattering ability can be greater than that of the columnar microstructures 14 in the second region Q. Therefore, The first region P has a higher number of light reflections and a light scattering effect, which makes the mixed light more uniform, reduces the distribution of bright and dark bands adjacent to the light incident surface 12a, and improves the light uniformity of the light guide plate 12. It should be noted that the above-mentioned surface treatment method of hot pressing, laser, or etching is merely an example and is not limited. It is only necessary to perform surface treatment on the columnar microstructures 14 of the first region P to make the columnar microstructures 14 of the first region P It is sufficient that the cross-sectional shape, height, angle, etc. are changed and the light-diffusing ability is higher than that of the columnar microstructures 14 in the second region Q.

In summary, the embodiments of the present invention have at least one of the following advantages. With the design of each of the above embodiments, the surface of the columnar microstructures adjacent to the light incident side is subjected to surface treatment, such as changing the microstructure shape by surface processing. Or filling the microstructured surface with optical materials, that is, the light scattering effect of different regions of the light emitting surface can be locally adjusted, so as to reduce the distribution of bright and dark bands adjacent to the light incident surface and improve the uniformity of light output in a relatively simple manner.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of patent application does not need to achieve all the purposes or advantages or features disclosed by the invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the components or to distinguish between different embodiments or ranges, not to limit the upper or lower limit of the number of components. .

Claims (10)

    A backlight module includes: a light guide plate having at least one light incident surface and a light emitting surface, the light emitting surface having a first region adjacent to the light incident surface, and a light emitting surface far from the light incident surface and adjacent to the first area. A second region; a plurality of columnar microstructures disposed at least on the first region and the second region of the light emitting surface, each of the columnar microstructures having a microstructure surface formed between every two adjacent microstructure surfaces A gap; and an optical material filling the gap in the first region.         The backlight module according to item 1 of the scope of patent application, wherein the filling height of the optical material in the gap is flush with the apex of the adjacent surface of the microstructure.         The backlight module according to item 1 of the patent application scope, wherein the optical material is a printing ink or an optical coating.         The backlight module according to item 1 of the scope of patent application, wherein a long axis direction of each of the columnar microstructures is substantially perpendicular to the light incident surface.         The backlight module according to item 1 of the scope of patent application, wherein the columnar microstructures are substantially parallel to each other.         A backlight module includes: a light guide plate having at least one light incident surface and a light emitting surface, the light emitting surface having a first region adjacent to the light incident surface, and a light emitting surface away from the light incident surface and adjacent to the first area. A second region; a plurality of columnar microstructures disposed at least on the first region and the second region of the light emitting surface, wherein the columnar microstructures all have the same shape; and an optical material coated on The first regions of the columnar microstructures.         The backlight module according to item 6 of the patent application scope, wherein the optical material is a printing ink or an optical coating.         A backlight module includes: a light guide plate having at least one light incident surface and a light emitting surface, the light emitting surface having a first region adjacent to the light incident surface, and a light emitting surface away from the light incident surface and adjacent to the first area. A second region; a plurality of first columnar microstructures disposed on the first region of the light emitting surface; a plurality of second columnar microstructures disposed on the second region of the light emitting surface, wherein each of the first columnar structures The microstructure is different in shape from each of the second columnar microstructures, and the light scattering capability of each of the first columnar microstructures is greater than the light scattering capability of each of the second columnar microstructures.         The backlight module according to item 8 of the scope of patent application, wherein the first columnar microstructure is formed with a hot-pressed, laser, or etched surface.         The backlight module according to item 8 of the scope of patent application, wherein the first columnar microstructures and the second columnar microstructures are substantially parallel to each other.