CN201035174Y - Side light type light guide plate - Google Patents

Abstract

The utility model relates to a side light formula light guide plate, a wedge-shaped plate body, the great one end of its one side thickness is for going into the light side, this plate body top surface is the play plain noodles, and form the rough planar form scattering pattern face of sandblast on it, the light guide pattern face that this plate body bottom surface mainly constitutes for unsmooth row, the district section that this light side is gone into to the neighbouring of this light guide pattern face sets up the rough planar form scattering pattern face of sandblast, can set up the rough planar form scattering pattern face of sandblast for going into light side both sides again in this light guide pattern face, thereby, make the light of side direction incidence can be through appropriate reflection and scattering, and send from going out the plain noodles uniformly, improve existing dark area phenomenon, and the scattering pattern face that the sandblast means formed, make the manufacturing of this light guide plate.

Description

Side-lit light guide plate

technical field

The utility model relates to a side-light backlight module, in particular to a structural design proposed for a light guide plate in the backlight module.

Background technique

At present, the design of the backlight module used to provide backlight in liquid crystal displays can be divided into two types: side-light type and direct-light type. Among them, the composition of the side-light type backlight module mainly uses a cold cathode tube as a rod-shaped light source. And a light guide plate arranged on the side of the cold cathode tube, which is used to provide the light emitted by the cold cathode tube to enter from one side of the light guide plate, and then pass through the refraction of the light guide plate to make the light guide itself The light emitting surface of the light plate scatters out evenly to provide the light source required by the panel of the liquid crystal display for displaying images.

Generally speaking, the design of the known light guide plate 30 is shown in FIG. The light guide plate 3

0 can be a plate body with the same thickness, or a wedge-shaped plate body whose thickness at the light-incident end 31 is greater than that at the opposite end, and the latter wedge-shaped light guide plate has a better light guiding effect. When the aforementioned light guide plate 30 is applied to an edge-lit backlight module, since the light emitted by the cold cathode tube 40 of the backlight module is projected laterally into the light guide plate 30 , the light-emitting surface of the light guide plate 30 is adjacent to the light-incoming end 31 There will be about 10mm wide area of reduced brightness, so that the bright lines of the edge effect will be more obvious due to the contrast effect. In addition, the two sides of the light-emitting surface 32 of the light guide plate 30 relative to the light-incoming end 31, because corresponding to the non-effective light-emitting section of the two electrode ends of the cold cathode tube 40, will also produce a dark band with reduced brightness, which will affect the light guide plate. The brightness uniformity of the light-emitting surface.

In order to improve the aforementioned problem of the light-emitting surface of the light guide plate being reduced in brightness, someone designed a novel patent case such as Taiwan Patent Publication No. 585259 "side-light surface light source device, liquid crystal display and light guide plate". The light-emitting surface of the side-light type light guide plate or its back is provided with a roughened scattering pattern surface, the scattering pattern surface is composed of a large number of microscopic particles (below about 80 μm) that are difficult to distinguish, and the formation of the above-mentioned scattering pattern surface is mainly Through the etching process of the light guide plate forming mold, the light guide plate can be integrally formed with the structure of the rough surface on the light-emitting surface or the back surface, so as to form the scattering pattern surface, so that the light can be projected onto the scattering pattern Surface, the irregular concave-convex rough surface can scatter light, preventing the reduction of the brightness of the aforementioned dark band section.

However, the design of the front light guide plate with its scattering pattern on the light-emitting surface has limited improvement effect on the phenomenon of brightness reduction, because: when the light enters from the light-incident end of the light guide plate, it mainly passes through the light guide plate. The light guide pattern surface formed by several concavo-convex rows on the bottom surface enables the light to be scattered and redirected to the light-emitting surface. The reason why the brightness of the previous light guide plate is reduced in a specific section of the light-emitting surface is that the light intensity of the light incident into the light guide plate is not enough to diffuse to this section. Now the light guide plate is roughened on the light-emitting surface The surface of the scattering pattern only provides further scattering for the light scattered to the light-emitting surface, and cannot effectively increase the light intensity projected to the area with reduced brightness. The gain that can be provided to improve the problem of reduced brightness in this area is very limited , so that the dark band phenomenon formed by the brightness-reduced section is still visible.

As for the light guide pattern surface on the back of the light guide plate, when a roughened scattering pattern surface is set, because the roughened scattering pattern surface is processed by etching through its molding die, because the light guide pattern surface is shaped as a concave-convex row shape , in the etching process of the mould, it is difficult to effectively control the amount of processing, which makes it difficult to control the uniformity of the light emitted by the light guide plate.

Utility model content

The main purpose of the present utility model is to provide a side-light type light guide plate, hoping to solve the problems of dark bands and poor uniformity of light emitted by the existing light guide plate.

In order to achieve the purpose of the disclosure, the technical solution proposed by the utility model is to make the side-light light guide plate a wedge-shaped plate body, which includes a light incident side, a light exit surface and a light guide pattern surface. The light side is located at the thicker end of the wedge-shaped plate body, the light-emitting surface is located on the top surface of the plate body, and this surface forms a sandblasted rough first scattering pattern surface, the light guide pattern surface is located below the plate body, and is The light guide pattern surface is adjacent to the concave-convex list surface of the light-incident side section to form a sandblasting rough second scattering pattern surface.

According to the design of the previously disclosed technical scheme of the utility model, the effect that can be achieved is: the wedge-shaped light guide plate of the utility model is provided with a rough scattering pattern surface on its light-emitting surface, and a rough scattering pattern is set in a specific section of the light guide pattern surface at the bottom. The combination of surfaces, so that the light incident from the light incident side can be evenly emitted from the light exit surface through appropriate reflection and scattering, so as to improve the dark band phenomenon of the prior art. In addition, the utility model is formed on the surface. The surface of the scattering pattern is processed by sandblasting, which is relatively simple and easy in the manufacturing process, and its quality is easy to control, which is helpful to the forming and manufacturing of the light guide plate.

Description of drawings

FIG. 1 is a schematic perspective view of a preferred embodiment of a side-lit light guide plate of the present invention.

FIG. 2 is a schematic plan view of a preferred embodiment of the side-lit light guide plate of the present invention.

3 is a schematic plan view of a preferred embodiment of adding a third scattering pattern surface on the light guiding pattern surface of the side-light light guide plate of the present invention.

Fig. 4 is a reference diagram of the use state of the side-light type light guide plate of the present invention.

FIG. 5 is a three-dimensional schematic view of a conventional edge-lit backlight module.

[Description of main component symbols]

10--Light guide plate 11--Light incident side

12--light-emitting surface 13--first scattering pattern surface

14--Light guide pattern surface 15--Second scattering pattern surface

16--The third scattering pattern surface

20--cold cathode tube 21--lampshade

30--Light guide plate 31--Light incident side

32--light-emitting surface 33--light guide pattern surface

40--cold cathode tube

Detailed ways

As shown in Figure 1, it discloses a preferred embodiment of the side-light light guide plate of the present invention. It can be understood from the figure that the light guide plate 10 is a wedge-shaped plate body, and the plate body includes a light-incident side surface. 11. A light-emitting surface 12 and a light-guiding pattern surface 14, wherein the light-incident side 11 is located on the smooth end surface of one side of the light-guiding plate 10, and the light-emitting surface 12 and the light-guiding patterned surface 14 are respectively the light-guiding plate 10 The upper and lower board surfaces, wherein the light-emitting surface 12 above the light guide plate 10 forms a first scattering pattern surface 13 in an all-round way. The first scattering pattern surface 13 is an irregular sandblasting rough surface formed by sandblasting. The light guide pattern surface 14 below 10 can be a pattern surface composed of several sharp tooth rows, arc-shaped convex part rows or wavy,...etc. Functionally, the light guide pattern surface 14 is provided with a second scattering pattern surface 15 adjacent to the light incident side 11 , and the second scattering pattern surface 15 is a sandblasting rough surface formed by sandblasting.

As shown in Figure 2, in the foregoing, the light guide pattern surface 14 can still be provided with a third scattering pattern surface 16 on the sections on both sides of the light incident side 11, and the third scattering pattern surface 16 can be formed by sandblasting. It is better to have a sandy rough surface, and the width of the third scattering pattern surface decreases as it moves away from the light-incident side, as shown in FIG. 3 .

The structure design of the light guide plate 10 disclosed in the present utility model is shown in Fig. 4. When it is applied to a backlight module, its light-incident side 11 is adjacent to the cold cathode tube 20, and the outside of the cold cathode tube 20 is provided with a lampshade 21. , so that the light emitted by the cold cathode tube 20 is focused on the light guide plate 10, and a reflector (not shown) is installed outside the light guide pattern surface 14 of the light guide plate 10, or on the light exit surface of the light guide plate 10 12. A prism sheet and a light-scattering sheet (not shown) are installed on the outside to form a side-lit backlight module.

When the side-light backlight module is applied to a liquid crystal display, it can be installed on the back of the liquid crystal panel. When in use, the side-light backlight module is a light source provided by the cold cathode tube 20, and the light passes through the light guide plate 10. The light incident side is incident, wherein the light guide pattern surface 14 on the bottom surface of the light guide plate 10 provides a reflection effect on the light, so that the light is guided to the light exit surface 12 and scattered out, providing the liquid crystal panel with the required light source for displaying the picture, Wherein, because the light guide pattern surface 14 on the bottom surface of the light guide plate 10 provides reflection to light, the design of the roughened second and third scattering pattern surfaces 15/16 on the light guide pattern surface 14 is further used to increase the projection of the light. The light intensity of the top surface of the light guide plate 10 adjacent to the light-incident side 11 and the sections on both sides, and the light-emitting surface 12 on the top has a comprehensive roughened scattering pattern surface 13, so that light can be scattered from the light-emitting surface 12 more uniformly Therefore, a relatively uniform brightness of the display screen of the liquid crystal panel is provided.

From the above description, it can be seen that the combination of setting a rough scattering pattern surface on the light emitting surface of the utility model and setting a rough scattering pattern surface on a specific section of the light guiding pattern surface can effectively improve the scattering of light from the light emitting surface of the light guide plate. At the same time, the scattering pattern surface of the utility model is a rough surface formed by sandblasting. In the process of manufacturing, it is easier to etch and easy to control its quality, so it can provide a more Practical light guide plate design.

Claims (6)

1. side-light type light guide plate, it is characterized in that, it is the plate body of a wedge shape, comprise a light incident sides, an exiting surface and a leaded light pattern plane on this plate body, this light incident sides is positioned at the bigger end of this clapboard body thickness, and this exiting surface is positioned at the plate body end face, and full surface forms the coarse first planar scattering pattern face of sandblast, this leaded light pattern plane is positioned at the plate body below and is concavo-convex row shape, and the section of contiguous this light incident sides of this leaded light pattern plane has the coarse second planar scattering pattern face of sandblast.

2. as 1 described side-light type light guide plate of claim the, it is characterized in that wherein this leaded light pattern plane is provided with coarse the 3rd planar scattering pattern face of sandblast with respect to the section of light incident sides both sides.

3. as 2 described side-light type light guide plate of claim the, it is characterized in that wherein the 3rd scattering pattern face is with width reduces away from light incident sides.

4. as each described side-light type light guide plate of 1 to 3 of claim the, it is characterized in that wherein this concavo-convex row shape leaded light pattern plane is constituted by several pointed tooth row.

5. as each described side-light type light guide plate of 1 to 3 of claim the, it is characterized in that wherein this concavo-convex row shape leaded light pattern plane is constituted by several arc protuberance row.

6. as each described side-light type light guide plate of 1 to 3 of claim the, it is characterized in that wherein this concavo-convex row shape leaded light pattern plane is wavy row.

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