TWM523864U - Light guiding structure and backlight module - Google Patents

Abstract

A light guiding structure is provided, including a first light guiding layer, a second light guiding layer, and a third light guiding layer, wherein the light guiding structure defines a first region and a second region, and the distance between the first region and a light source is less than that between the second region and the light source. The second light guiding layer is disposed on the first light guiding layer and includes a plurality of stripe structures, and at least a part of stripe structures is disposed between the first light guiding layer and the third light guiding layer. The third light guiding layer is disposed on the second light guiding layer and in the first region.

Description

Light guiding structure and backlight module

This creation is about a light guiding structure. More specifically, the present invention relates to a light guiding structure having a strip structure.

Backlight Module (BLM) is one of the important components of thin film transistor liquid crystal display (TFT-LCD). Since the thin film transistor liquid crystal display is a non-self-luminous display, it is necessary to project light through the light source and pass through the light guiding structure, the diffusion sheet, the cymbal, the liquid crystal panel and the like in the thin film transistor liquid crystal display, and finally enter the person. The eye is imaged to achieve the displayed function.

The backlight module is divided into an edge type (Edge Type) and a direct type (Direct Type) according to the position of the light source, wherein the side light type structure is disposed on the side of the light guide structure. However, the light-emitting surface of the light guiding structure is prone to light leakage or bright lines near the light source.

In order to solve the above problems, the present invention provides a light guiding structure including a first light guiding layer, a second light guiding layer and a third light guiding layer, wherein the light guiding structure defines a first area and a first Two regions, and the first region is closer to a light source than the second region. The second light guiding layer is disposed on the first light guiding layer and includes a plurality of strip structures, and the foregoing strip structures are at least partially disposed Between the first light guiding layer and the third light guiding layer. The third light guiding layer is disposed on the second light guiding layer and located in the first region.

In an embodiment of the present invention, the long axis direction of the strip structure extends in a first direction away from a light incident surface of one of the light guiding structures.

In an embodiment of the present invention, the length of the strip structure extending in the first direction is equal to the length of the first light guiding layer extending in the first direction.

In an embodiment of the present invention, the third light guiding layer has a first end and a second end, the first end is adjacent to the light source and the second end is adjacent to the second area, wherein the thickness of the first end is greater than the thickness of the second end thickness.

In an embodiment of the present invention, the first light guiding layer has a first refractive index, and the second light guiding layer has a second refractive index, wherein the second refractive index is greater than the first refractive index.

In an embodiment of the present invention, the second light guiding layer has a second refractive index, and the third light guiding layer has a third refractive index, wherein the second refractive index is greater than the third refractive index.

In an embodiment of the present invention, the third light guiding layer has a first end and a second end, the first end is adjacent to the light source and the second end is adjacent to the second area, wherein the thickness of the first end is greater than the thickness of the second end thickness.

In an embodiment of the present invention, the third light guiding layer has an inclined surface.

An embodiment of the present invention further provides a backlight module, comprising the foregoing light guiding structure and a light source, wherein light emitted by the light source enters the light guiding structure and exits the light guiding structure from the second light guiding layer.

In an embodiment of the present invention, the thickness of the light source is less than or equal to The thickness of the first light guiding layer, the second light guiding layer and the third light guiding layer is added.

10‧‧‧Light guiding structure

11‧‧‧First area

12‧‧‧Second area

20‧‧‧Light source

100‧‧‧First light guide layer

110‧‧‧Light guiding microstructure

200‧‧‧Second light guiding layer

210‧‧‧ strip structure

300‧‧‧3rd light guide layer

310‧‧‧ first end

320‧‧‧ second end

330‧‧‧ sloped surface

A1‧‧‧ first direction

D‧‧‧thickness

I‧‧‧Into the glossy

Fig. 1 is a schematic view showing the light guiding structure of an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along the line x-x in Fig. 1.

3A and 3B are views showing a backlight module in an embodiment of the present invention.

Fig. 4 is a cross-sectional view taken along line y-y in Fig. 1.

The light guiding structure of the present embodiment and the backlight module including the foregoing light guiding structure are described below. However, it will be readily appreciated that the present creative embodiment provides many suitable creative concepts and can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of the use of the present invention in a particular way, and are not intended to limit the scope of the present invention.

It will be understood that the terms "first", "second", and the like may be used to describe various elements, components, regions, layers, and/or portions, such elements, components, regions, layers, and / The terms are not limited by the terms, and are used to distinguish different elements, components, regions, layers, and/or parts.

Referring to FIG. 1 and FIG. 2, the light guiding structure 10 of the embodiment has a three-layer structure, including a first light guiding layer 100, a second light guiding layer 200, and a third light guiding layer 300. The second light guiding layer 200 is located between the first light guiding layer 100 and the third light guiding layer 300.

The second light guiding layer 200 is disposed on the first light guiding layer 100 and has a complex A plurality of strip structures 210, and the long axis direction of the strip structure 210 extends along a first direction A1. The third light guiding layer 300 is disposed on the second light guiding layer 200 and has a first end 310 and a second end 320. The thickness of the first end 310 is greater than the thickness of the second end 320, so an inclined surface 330 It may be formed between the first end 310 and the second end 320.

It should be noted that the first light guiding layer 100 is made of polycarbonate (Polycarbonate, PC) or polymethylmethacrylate (PMMA). The second light guiding layer 200 is coated with a UV-cured acrylate resin on the first light guiding layer 100, covered with a transparent mold on the first light guiding layer 100, and then cured by ultraviolet light (UV). The third light guiding layer 300 is formed on the second light guiding layer 200 in the same manner after the second light guiding layer 200 is cured.

In addition, in this embodiment, the first light guiding layer 100, the second light guiding layer 200, and the third light guiding layer 300 respectively have a first refractive index, a second refractive index, and a third refractive index, wherein the second refractive index Greater than the first refractive index and the third refractive index.

As shown in the second, third, and third embodiments, the backlight module of one embodiment of the present invention includes a light source 20 disposed on one side of the light guiding structure 10 in addition to the light guiding structure 10, and the light source. The light emitted by 20 can enter the light guiding structure 10 from one of the light guiding structures 10 into the light surface I.

The light guiding structure 10 can define a first area 11 and a second area 12. The first region 11 is closer to the illumination source 20 than the second region 12, and the third light guiding layer 300 is located in the first region 11. The first end 310 is adjacent to the illumination source 20 and the second end 320 is adjacent to the second region 320. Area 12.

Please continue to refer to the 3A, 3B diagram, the light from the illumination source 20 Upon introduction of the light structure 10, the interface between the layers will be touched to produce a different result. Taking the light in the third light guiding layer 300 as an example, when the light contacts the interface between the second light guiding layer 200 and the third light guiding layer 300, since the second refractive index is greater than the third refractive index, the third is The light in the light guiding layer 300 can be smoothly refracted into the second light guiding layer 200 (Fig. 3A), and is less likely to cause reflection and return to the third light guiding layer 300. Similarly, as shown in FIGS. 3A and 3B, taking the light in the first light guiding layer 100 as an example, when the light contacts the interface between the first light guiding layer 100 and the second light guiding layer 200, the second refractive index is obtained. The light is greater than the first refractive index, so that the light in the first light guiding layer 100 can be smoothly refracted into the second light guiding layer 200, and is less likely to cause reflection and return to the first light guiding layer 100. In addition, as shown in FIG. 4, in the embodiment, the strip structure 210 is at least partially located between the first and third light guiding layers 100 and 300, so that the second and third light guiding layers 200 can be strengthened. The effect of light reflected downward between 300 to reduce light loss.

In addition, a plurality of light guiding microstructures 110 are disposed on the bottom surface of the first light guiding layer 100, and the density is from dense to dense. Therefore, when the light travels through the first light guiding layer 100, Since the reflection angle is changed by touching the aforementioned light guiding microstructure, the total reflection effect is broken and the light is easily refracted, so in the second region 12, the light can exit the light guiding structure 10 through the second light guiding layer 200, Moreover, as the density of the light guiding microstructure is from dense to dense, the amount of light is increased and the brightness is increased farther away from the light source 20, so as to avoid the problem of uneven light output after the front light is dark.

It should be noted that, as shown in FIG. 4, although the light enters the second light guiding layer 200 from the first light guiding layer 100 in the first region 11, the second and third refractive indexes and the strips are With the arrangement of the structure 210, most of the light will still The light is reflected between the second light guiding layer 200 and the third light guiding layer 300 to return to the second light guiding layer 200, thereby reducing the chance of penetrating the third light guiding layer 300, thereby reducing light leakage and avoiding occurrence of bright lines. .

In this embodiment, each strip structure 210 has a semi-circular cross section (Fig. 4), and each strip structure 210 has the same size. However, in some embodiments, the strip shape may also be changed according to requirements. The shape and size of the structure 210. For example, the partial strip structure 210 may have an elliptical cross section, and the partial strip structure 210 may have a triangular cross section, or the partial strip structure 210 may have a longer length extending from the incident surface I in the first direction A1. The partial strip structure 210 has a shorter length extending from the light incident surface I in the first direction A1.

In addition, as shown in the first, third, and third embodiments, the length of the strip structure 210 in the first direction A1 extending away from the light incident surface I is equal to that of the first light guiding layer 100. The length of one direction A1 extends so that light rays in the second region 12 will more easily exit the light guiding structure 10 due to scattering. The thickness D of the light source 20 can be less than or equal to the thickness of the first light guiding layer 100, the second light guiding layer 200 and the third light guiding layer 300, so that most of the light emitted by the light source 20 can be The first light guiding layer 100, the second light guiding layer 200 and the third light guiding layer 300 are entered from the light incident surface I, and therefore, the light can be effectively utilized and does not leak out in the first region 11.

In summary, the present invention provides a light guiding structure, which can enhance the reflection of light toward the first light guiding layer by providing a strip structure between the first light guiding layer and the third light guiding layer, avoiding the first Light leakage in the area. Furthermore, since the second light guiding layer has a second refractive index greater than the first and third refractive indices of the first and third light guiding layers, the light can be effectively guided and by the second region The two light guiding layers leave the light guiding structure.

Although the embodiments of the present invention and its advantages have been disclosed as above, it should be understood that those skilled in the art can make changes, substitutions and refinements without departing from the spirit and scope of the present invention. In addition, the scope of protection of the present invention is not limited to the processes, machines, manufacturing, material compositions, devices, methods, and steps in the specific embodiments described in the specification, and any one of ordinary skill in the art may disclose the present disclosure. It is understood that the processes, machines, manufactures, compositions, devices, methods, and steps that are presently or in the future can be used in accordance with the present invention as long as they can perform substantially the same function or achieve substantially the same results in the embodiments described herein. Therefore, the scope of protection of the present invention includes the above processes, machines, manufacturing, material compositions, devices, methods and steps. In addition, each patent application scope constitutes an individual embodiment, and the scope of protection of the present invention also includes the combination of each patent application scope and embodiment.

Although the present invention has been disclosed above in the foregoing several preferred embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field of the present invention can make some changes and refinements without departing from the spirit and scope of the present creation. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application. In addition, each of the patent application scopes constitutes a separate embodiment, and the scope of the various patent applications and combinations of the embodiments are all within the scope of the present invention.

10‧‧‧Light guiding structure

100‧‧‧First light guide layer

110‧‧‧Light guiding microstructure

200‧‧‧Second light guiding layer

210‧‧‧ strip structure

300‧‧‧3rd light guide layer

310‧‧‧ first end

320‧‧‧ second end

330‧‧‧ sloped surface

A1‧‧‧ first direction

I‧‧‧Into the glossy

Claims (10)

A light guiding structure defines a first area and a second area, wherein the first area is closer to a light source than the second area, and the light guiding structure comprises: a first light guiding layer; a light guiding layer disposed on the first light guiding layer and including a plurality of strip structures; and a third light guiding layer disposed on the second light guiding layer and located in the first region, wherein the plurality of light guiding layers are disposed on the first light guiding layer The strip structure is at least partially disposed between the first light guiding layer and the third light guiding layer. The light guiding structure of claim 1, wherein the long axis direction of the strip structures extends in a first direction away from a light incident surface of the light guiding structure. The light guiding structure of claim 2, wherein the length of the strip structures extending along the first direction is equal to the length of the first light guiding layer extending along the first direction. The light guiding structure of claim 3, wherein the third light guiding layer has a first end and a second end, the first end is adjacent to the light source and the second end is adjacent to the second area Wherein the thickness of the first end is greater than the thickness of the second end. The light guiding structure of claim 1, wherein the first light guiding layer has a first refractive index, and the second light guiding layer has a second refractive index, wherein the second refractive index is greater than the First refractive index. The light guiding structure according to claim 1, wherein the second light guiding The layer has a second index of refraction, and the third light guiding layer has a third index of refraction, wherein the second index of refraction is greater than the third index of refraction. The light guiding structure of claim 1, wherein the third light guiding layer has a first end and a second end, the first end is adjacent to the light source and the second end is adjacent to the second area Wherein the thickness of the first end is greater than the thickness of the second end. The light guiding structure of claim 1, wherein the third light guiding layer has an inclined surface. A light-emitting structure according to any one of claims 1 to 8, and a light-emitting source, the light emitted from the light source enters the light-guiding structure, and from the first The two light guiding layers leave the light guiding structure. The backlight module of claim 9, wherein the thickness of the light source is less than or equal to a thickness of the first light guiding layer, the second light guiding layer and the third light guiding layer.