TWI406019B - The structure of the light guide plate - Google Patents

Abstract

This invention relates to a light guide plate structure. The light-emitting surface and reflection surface of the light guide plate are both disposed with strip-shaped photoconductors, which are arranged along the same direction from the incident surface of the light guide plate toward the anti-incident surface; in addition, at least one of the light-emitting surface or the reflection surface is equipped with a light guide structure, such that when light passes through the light-emitting surface and the reflection surface, the light will be blended by the strip-shaped photoconductors therein and guided to the light-emitting direction by the light guide structure, thereby enhancing the homogenization of light and ensuring the subsequent homogeneous light emission of the light guide plate.

Description

Light guide plate structure

The invention relates to a structure of a light guide plate, in particular to a structure capable of effectively mixing light into a light source to facilitate subsequent uniform light emission of the light guide plate.

According to a liquid crystal display (LCD), a liquid crystal panel (LCD panel) and a backlight module (Back Light Module) are mainly composed. Among them, the liquid crystal panel is used for the display of the screen, but the liquid crystal panel itself does not emit light, and the light source necessary for display is completely provided by the backlight module, that is, a backlight module occupies a great position in a liquid crystal display. The importance of the backlight module must provide a high-luminance and uniformity of the light source as its primary goal, the quality of the light source is the main responsible for the light guide plate in a backlight module.

As shown in FIG. 1 , the conventional wedge-shaped light guide plate 1 has a light-emitting surface 11 , a reflective surface 12 opposite to the light-emitting surface 11 , and at least one side connected to the light-emitting surface 11 and the reflective surface 12 The light-emitting surface 13 is configured to receive the light source emitted by the light source A matched to the outside, and the light source is continuously transmitted inside the light guide plate 1. The light source A may be a light-emitting diode (LED). Or a cold cathode lamp (CCFL), the light-emitting surface 11 is used to guide the light source away from the body of the light guide plate 1, and is applied to the liquid crystal panel, and the reflective surface 12 can reflect the light source that is incident thereon, Then march toward the light surface 11 again.

Wherein, the reflective surface 12 is densely covered with strip-shaped light conductors 14 having a triangular cross section, so that the light source is reflected by the reflective surface 12 while being reflected by the strips of the triangles The light conductor 14 achieves the effect of concentrating the light source and guides the direction of travel of the light source after the reflection; the light exit surface 11 is roughened by sand blasting or other processing methods, so that the light source exits through the light exit surface 11 The light source 11 is used to scatter the light source to achieve the purpose of homogenizing the light.

As shown in FIG. 2, another conventional wedge-shaped light guide plate 2 is designed to roughen the reflective surface 22, and the light-emitting surface 21 is provided with a strip-shaped light conductor 24 having a triangular cross-section; when the light source passes through the light-emitting surface 23 After passing through the light guide plate 2, the light source that is incident on the reflecting surface 22 will be scattered first to diffuse the light source, and then travel toward the light exiting surface 21, and when it is desired to leave the light guide plate 2, the light exiting surface 21 When the strip-shaped photoconductor 24 is used, the light source is concentrated to guide the direction of travel of the light source.

The above two conventional light guide plate designs are all arranged on the reflective surface or the light exit surface of the light guide plate, and one of the two is provided with a strip-shaped photoconductor having a triangular cross section, and the strip light guide is used for correcting and guiding the light source. On the other hand, one of the reflective surface or the light-emitting surface is roughened to be used as a light source for diffusion. However, these designs have insufficient light mixing properties for the light source of the light source, and it is still easy to make the overall light source of the output uniform and insufficient, which is disadvantageous for subsequent use of the LCD panel.

The invention relates to a structure of a light guide plate which is made of a good light transmissive material and has a light emitting surface, a reflecting surface, a light incident surface and a reverse light incident surface. The light-emitting surface guides the light source away from the light guide body, and the reflective surface will be launched there. The light source reflects, changes the direction of travel of the light source, and then advances toward the light exit surface. The light incident surface receives the light source emitted by the configured light source, and transmits the light source to the inside of the light guide plate.

The main object of the present invention is to improve the phenomenon that the light guide plate is insufficiently diffused by the light guide plate by the light guide plate of the present invention, and the output light source can be evenly distributed to facilitate the subsequent supply of the light source to the liquid crystal panel display. Used by it.

Therefore, the main technical means used in the present invention is to provide a structure of a light guide plate, wherein the light-emitting surface and the reflective surface of the light guide plate are all provided with strip-shaped light conductors, and the strip-shaped light guide system is from the light guide plate. The light incident surface is disposed in the same direction as the reverse light incident surface, and each strip light guiding system is disposed in a continuous or spaced manner, wherein one side of the light emitting surface or the reflecting surface is provided with a light guiding structure, thereby making the light source The light source is scattered by the strip-shaped photoconductor in the light-emitting surface and the reflective surface when the interior of the light-reflecting surface is reflected and transmitted, and when the light-emitting surface is refracted and exits the light guide plate, The light guiding structure in the light emitting surface or the reflecting surface enables the light source to further uniformly mix light, so that the light incident light field of the light source obtains a better homogenization performance, thereby enabling the light guide plate of the present invention to achieve the requirement of homogenizing the light source.

In order to enable the review committee to further understand the structure of the case, the application of technical means, and the effectiveness of its production, the following description is in conjunction with the drawings; the present invention relates to the structure of a light guide plate. First, please refer to FIG. The light guide plate 3 of the invention has a light emitting surface 31, a reflecting surface 32 corresponding to the light emitting surface 31, and at least one side connected to the light emitting surface 31 and the reflecting surface 32. The light incident surface 33 and the light incident surface 34 corresponding to the light incident surface 33 are located.

The light-emitting surface 31 and the reflective surface 32 of the light guide plate 3 are all provided with a plurality of strip-shaped light conductors 35, and the strip-shaped light conductors 35 are connected continuously and from the light-incident surface 33 of the light guide plate 3 to the reverse light-incident surface. 34 is disposed in the same direction, wherein the angle of the top end of the strip-shaped photoconductor 35 is arcuate to facilitate the light mixing effect of the light source. Even, as shown in FIG. 4, the strip-shaped photoconductors 35 may have an arcuate cross section and may have a greater diffusion effect on the light source.

Referring to FIG. 5, when the light source of the light source A enters the light incident surface 33 of the light guide plate 3, the light source will be transmitted inside the light guide plate 3, and the light source that is incident on the reflective surface 32 will be further If the light source is incident on the light-emitting surface 31, the light source refracts light from the light-emitting surface 31. When the light source is reflected on the reflective surface 32, the strip-shaped light conductor 35 is densely covered by the reflective surface 32, and By the arcuate cross section of the top end of the strip-shaped photoconductor 35 or the overall cross section, the light source can form a scattering phenomenon, so that the light source reflected by the reflecting surface 32 has the effect of scattering diffusion at the same time; and the light source passes through the light emitting surface. 31, when it is desired to leave the light guide plate 3, the light-emitting surface 31 is also densely covered with strip-shaped light conductors 35. When the light source is refracted through the strip-shaped light conductors 35, the angle between the top ends of the strip-shaped light conductors 35 or The overall cross section is an arc-shaped design, and the refracted light source forms a scattering phenomenon, so that the light source has a diffusion effect when it leaves the light guide plate 3.

The light guide plate 3 of the present invention is provided with a strip-shaped photoconductor 35 by the light-emitting surface 31 and the reflective surface 32, so that when the light source is reflected and transmitted therein, and is refracted When leaving the light guide plate 3, the light source can be scattered by the arc-shaped cross section of the strip-shaped light conductor 35, or the cross section of the body is curved, so that the light guide plate 3 of the present invention can reach the light source. Homogenize the requirements of light.

Referring to FIG. 6 again, in the implementation of at least one of the light-emitting surface 31 or the reflective surface 32 of the light guide plate 3 of the present invention, the height of the strip-shaped light conductor 35 can be achieved. The non-uniform height makes the reflection or refraction of the light source not too uniform, which also helps the light source to spread evenly.

Referring to FIG. 7 , the strip light of the light-emitting surface 31 or the reflective surface 32 of the light guide plate 3 of the present invention is closer to the position of the light-incident surface 33. The smaller the height of the conductor 35, and the closer to the position of the reverse incident surface 34, the smaller the height of the strip-shaped light conductors 35; the larger the distance to the light source A due to the position close to the light-incident surface 33 The light intensity, and the light source leaking from the reverse light surface 34 is reflected by the back frame (not shown) of the light guide plate 3, so that the light source is again reflected by the reverse light surface 34. It enters the light guide plate 3, and at this point, it also has a large light intensity phenomenon.

Referring to FIG. 8 again, at least one of the light-emitting surface 31 or the reflective surface 32 of the light guide plate 3 of the present invention can be further densely embossed to or protrude from the light guiding structure 36 of the surface, and the light guiding structure is densely covered. In addition to the action of the strip-shaped photoconductor 35, the light source can enhance the light mixing effect on the light source by the light guiding structures 36. At the same time, the light guiding structure 36 is further changed in the form of the setting, for example, in the region where the light source is in a different intensity, the light energy is weaker. The field increases the height/depth, the area, or the density of the distribution of the light guiding structures 36. Conversely, the height/depth, area, or density of the distribution of the light guiding structures 36 is reduced in areas where the light energy is strong. . In this way, the light guiding structure 36 can be better matched with the light sources of different strengths, so that the effect on the light source can be better.

Referring to FIG. 9 again, the light guiding structure 36 may be a hemisphere having a curved surface, and the surface of the hemisphere may be a mirror surface or a rough surface; or as shown in FIG. The shape of the light guiding structure 36 may be a three-dimensional table shape, and the surface of the table shape may be a mirror surface or a rough surface; or as shown in FIG. 11 , the light guiding structure 36 has a section structure of a geometric figure. And the surface of the segment structure in which the cross section is a geometric figure may be a mirror surface or a rough surface.

Referring to FIG. 12, when the light guide plate 3 of the present invention is implemented, the plurality of strip-shaped photoconductors 35 disposed on the light-emitting surface 31 and the reflective surface 32 can be continuous and have an interval of 37. Since the light incident surface 33 of the light guide plate 3 is disposed in the same direction as the reverse light incident surface 34, the light mixing effect of the light source can be similarly achieved. When the light guiding structure 36 of the present invention is applied to the light guiding plate 3, the distribution pattern thereof can be as shown in FIG. 13 , and at least one of the light emitting surface 31 or the reflecting surface 32 of the light guiding plate 3 is densely concave. Or the light guiding structure 36 of the surface of the light guide plate 3 a light guiding structure 36 that protrudes or protrudes from the surface; or as shown in FIG. 15, only the light emitting surface 31 or the reflecting surface 32 of the light guiding plate 3 A space 37 of at least one of the strip-shaped photoconductors 35 is densely attached to the light guiding structure 36 that is recessed or protrudes from the surface. Thereby, the light guiding structure 36 provided by the light guiding structure 36 can enhance the light mixing effect of the light source by the light guiding structure 36, so that the effect on the light source can be better.

In summary, the light guide plate of the present invention can achieve the effect of homogenizing when the light source is lighted, and helps to improve the subsequent application of the light source, which has been utilized by the industry, and is progressive and practical. To file an application, please ask your review committee for a detailed examination and grant approval for the approval of the patent.

1‧‧‧Light guide plate

11‧‧‧Glossy

12‧‧‧reflecting surface

13‧‧‧Into the glossy surface

14‧‧‧ Strip light conductor

2‧‧‧Light guide plate

21‧‧‧Glossy

22‧‧‧reflecting surface

23‧‧‧Into the glossy surface

24‧‧‧ strip light conductor

3‧‧‧Light guide plate

31‧‧‧Glossy

32‧‧‧reflecting surface

33‧‧‧Into the glossy surface

34‧‧‧Anti-glossy

35‧‧‧ Strip light conductor

36‧‧‧Light guiding structure

37‧‧‧ interval

A‧‧‧Light source

Figure 1 is a schematic view of a conventional wedge-shaped light guide plate.

Figure 2 is a schematic view of another conventional wedge-shaped light guide plate.

Figure 3 is a schematic view of a light guide plate of the present invention.

Figure 4 is a schematic view showing another embodiment of the light guide plate of the present invention.

Figure 5 is a schematic view showing the movement of the light source of the light guide plate of the present invention.

Figure 6 is a schematic view of another embodiment of the present invention.

Figure 7 is a schematic view of still another embodiment of the present invention.

Figure 8 is a schematic view of still another embodiment of the present invention.

Figures 9, 10 and 11 are schematic views of different shapes of the light guiding structure of the present invention.

Figure 12 is a schematic view showing another embodiment of the strip-shaped photoconductor of the light guide plate of the present invention.

Figures 13, fourteen, and fifteen are schematic views showing different distributions of light guiding structures of the present invention.

3‧‧‧Light guide plate

31‧‧‧Glossy

32‧‧‧reflecting surface

33‧‧‧Into the glossy surface

34‧‧‧Anti-glossy

35‧‧‧ Strip light conductor

A‧‧‧Light source

Claims (14)

The structure of the light guide plate has at least one light emitting surface, one reflecting surface, one light incident surface and one reverse light incident surface, and the light emitting surface and the reflecting surface are all provided with a plurality of strips from the light incident surface to the opposite side of the light incident surface. The photo-conductor is characterized in that the angled section of the top ends of the strip-shaped photoconductors is arc-shaped, and the strip-shaped photoconductor having at least one side of the light-emitting surface or the reflecting surface of the light-guiding plate is densely covered with a concave or protruding light guiding structure And in the region where the light energy of the light guide plate is weak, the height/depth, the area, or the distribution density of each light guiding structure is increased, and conversely, the light light structure is formed in a region with a strong light energy. /Density of depth, area, or its distribution. The structure of the light guide plate according to claim 1, wherein the strip light guide system is in a continuous connection type. The structure of the light guide plate according to claim 1, wherein the strip-shaped photoconductor has a curved cross section. The structure of the light guide plate of claim 1, wherein the height of each of the strip-shaped light conductors of at least one of the light-emitting surface or the reflective surface may be a non-uniform height. The structure of the light guide plate according to claim 1, wherein at least one of the light-emitting surface or the reflective surface of the light guide plate is continuous and spaced. The structure of the light guide plate according to claim 5, wherein the light guide At least one of the light-emitting surface or the reflective surface of the panel is densely attached to the light guiding structure of the surface of the strip-shaped photoconductor and the spacer. The structure of the light guide plate according to claim 5, wherein at least one of the light-emitting surface or the reflective surface of the light guide plate is a light guide structure that is densely folded or protruded only on the strip-shaped light conductor. . The structure of the light guide plate of claim 5, wherein at least one of the light-emitting surface or the reflective surface of the light guide plate is densely covered or protruded from the interval between the strip-shaped light conductors. Structure. The structure of the light guide plate according to claim 1, wherein the shape of the light guiding structure may be a hemisphere having a curved surface. The structure of the light guide plate according to claim 9, wherein the surface of the hemisphere may be a mirror surface or a rough surface. The structure of the light guide plate according to claim 1, wherein the shape of the light guide structure can be a three-dimensional shape. The structure of the light guide plate according to claim 11, wherein the surface of the table shape may be a mirror surface or a rough surface. The structure of the light guide plate according to claim 1, wherein the cross section of the light guiding structure is a segment structure of the geometric figure. The structure of the light guide plate according to claim 13, wherein the surface of the segment of the geometric structure may be a mirror surface or a rough surface.