CN201004094Y - Light guide plate with light source uniformly diffused - Google Patents

Abstract

A light guide plate with uniformly diffused light source is prepared as forming multiple micro light diffusers in light incident surface, forming light diffuser by cambered surface and forming slope at two side root portions to let light source be left and right direction by cambered surface of light diffuser and to let light source be refracted by multiple angles, using slope of light diffuser to make refraction be left and right direction and to let light source be refracted by certain angle.

Description

Light guide plate with evenly diffused light source

【Technical field】

The utility model relates to a point-shaped light source of a light-emitting diode, which can make the light-emitting angle of the original light-emitting diode open and expand after passing through the light-incident surface of the light guide plate, and has a light source with uniform diffusion transmission. Evenly diffused light guide plate.

【Background technique】

The light source required for a TFT liquid crystal display depends on a surface light source device as shown in Figure 1, and the surface light source device 1 mainly has a light guide plate 11, a reflector plate 12, and a number of different light diffusion films 13 and prisms. Sheet 14, and lamp source 15 are formed. Among them, the light guide plate 11 is a component that mainly depends on receiving, transmitting, and changing the direction of the light source, and is also one of the most important components in the surface light source device 1 .

As shown in FIG. 2 , the light guide plate 11 is mostly a rectangular plate with a light emitting surface 111 and a reflecting surface 112 opposite to the light emitting surface 111 , and at least one side is set as the light incident surface 113 . The light incident surface 113 is mainly used to receive the light source from the light source 15 and transmit it to the inside of the light guide plate 11. After entering the light guide plate 11, part of the light source will directly leave the light output surface 111, and part of it will It will fall on the reflective surface 112, so the reflective surface 112 will be provided with many light guide points 1121 for reflecting light sources, and the configuration of the light guide points 1121 will be denser as the distance from the light source 15 increases, or the distance from the light source 15 increases. 15, the farther the area is, the more the area is increased to meet and bring into play the effectiveness of comprehensive light source reflection.

If the light source 15 of the above-mentioned mid-plane light source device 1 is applied with a cold cathode fluorescent lamp (coldcathode fluorescent lamp, CCFL), since the cold cathode fluorescent lamp provides a linear light source, it is relatively easy to apply, but if it is used When light-emitting diode (LED) is applied, because it provides a point light source, its application will be more complicated; as shown in Figure 3, the light-emitting diode 16 has a certain light source angle and is arranged on the light guide plate 11, when the light source enters the inside of the light guide plate 11 through the light incident surface 113, a bright area 114 will be formed in the light guide plate 11, because other positions are not within the light emitting angle of the light emitting diode 16, It will be formed into dark areas 115. In order to eliminate the formation of these dark areas 115, though it can be overcome by disposing a larger number of light emitting diodes 16, too many light emitting diodes 16 will not only increase the cost of parts, but also increase other parts. The power consumption, the complexity of product assembly, and the increased failure rate in the future are not a good solution.

Therefore, relevant companies have developed another solution. As shown in FIG. 4, the light guide plate 2 has a light-emitting surface 21, a reflective surface relative to the light-emitting surface 21, and at least one light-incident surface 23; The light incident surface 23 is formed with several zigzag light diffusers 231. With the arrangement of these light diffusers 231, when the light source of the light emitting diode 25 passes through the inclined surface 2311 of the diffuser 231, it produces a tendency to expand the light source. Angle, so that the position of the dark area 24 in the light guide plate 2 is lowered and narrowed. However, this structure of the light guide plate 2 produces another undesirable phenomenon. Please refer to FIG. The oblique surface 2311 produces refraction, that is, each light diffuser 231 will emit a left-right refracted light with the same direction of travel from the two inclined surfaces 2311, and the left and right refracted light will converge to form a bright line 26, the bright line 26 The formation of the light guide plate 2 will cause the light to be received unevenly, which is very easy to be restrained for the application of the subsequent light source, and is very unfavorable for the requirement of the overall uniformity of the light guide plate 2 .

【Content of utility model】

The purpose of this utility model is to provide a light guide plate with uniform diffusion of light source, which is to form a light diffuser in the light incident surface of the light guide plate, so that the light incident surface can expand the light angle of the light source, and the light is uniform. The diffused light is transmitted toward the inside of the light guide plate.

Another object of the present utility model is to provide a light guide plate with evenly diffused light source, by forming a light diffuser on the light incident surface of the light guide plate, so that the light incident surface can expand the light incident angle of the light source, and present a The uniform diffusion is transferred to the inside of the light guide plate. The light diffuser formed on the light incident surface of the light guide has one arc surface and two inclined surfaces. The light source can be refracted in left and right directions and multiple angles by using the arc surface.

Another object of the present utility model is to provide a light guide plate with evenly diffused light source, by forming a light diffuser on the light incident surface of the light guide plate, so that the light incident surface can expand the light incident angle of the light source, and present a The uniform diffusion is transferred to the inside of the light guide plate. The light diffuser formed in the light incident surface of the light guide body has an arc surface and two inclined surfaces. The light source can be refracted in the left and right directions at a fixed angle by using the two inclined surfaces.

In order to achieve the above object, the utility model provides a light guide plate with uniform diffusion of light source. The light guide plate has a light output surface for the output of the light source; a reflective surface for reflecting the light source to change its direction of travel; The surface is used to receive the light source output by the light source, and it is characterized in that: the light incident surface is formed with many miniature light diffusers, and the light diffuser has an arc surface, and the roots on both sides of the arc surface form an inclined plane And connect with the incident surface.

The light guide plate with uniform light source diffusion is characterized in that: the light diffuser formed on the light incident surface of the light guide plate can be arranged continuously and without intervals.

The above-mentioned light guide plate with uniform diffusion of light sources is characterized in that: the surface of the light diffuser in the light incident surface of the light guide plate can be further formed with a V-shaped light diffusion channel recessed inside the light guide plate, and the light diffusion The grooves are arranged in a straight line and connected between the light emitting surface and the reflecting surface.

The light guide plate with uniform diffusion of light sources is characterized in that: the light diffuser can also be formed by recessing the light incident surface inside the light guide plate.

The light guide plate with uniform diffusion of light sources is characterized in that the light diffusion channel formed on the surface of the light diffuser in the light incident surface may also be formed in the area of the light incident surface without the light diffuser.

The light guide plate with light source uniformly diffused is characterized in that: the light diffusion channel can also include a linear arrangement formed on the light emitting surface of the light guide plate and parallel to the straight forward direction of the light source in the light guide plate.

The light guide plate with uniform diffusion of light sources is characterized in that: the light diffusion channels are arranged regularly.

The light guide plate with uniform light source diffusion is characterized in that the light diffusion channels are arranged irregularly.

To sum up, the light guide plate of the present utility model has a uniformly diffused light source. The light guide plate has a light-emitting surface, a reflective surface opposite to the position of the light-emitting surface, and a light-incident surface. There are many miniature light diffusers, the light diffuser has an arc surface, and the root of the two sides is formed as a slope, so that the light source can be directed left and right by the arc surface of the light diffuser, and has multiple angles of refraction, and can also be used by light The inclined planes of the diffuser make left and right directions, and have a certain angle of refraction. Through the light sources refracted by the curved surfaces and inclined planes in each light diffuser, the light source can expand the angle of incidence and be uniformly diffused to the inside of the light guide plate.

【Description of drawings】

FIG. 1 is a schematic diagram of a conventional surface light source assembly.

Fig. 2 is a schematic diagram of movement of a known light guide plate light source.

FIG. 3 is a schematic diagram showing another representation of the light source in FIG. 2 .

FIG. 4 is a schematic diagram of movement of another known light guide plate light source.

FIG. 5 is a schematic diagram showing another representation of the light source in FIG. 4 .

Fig. 6 is a schematic structural view of the utility model.

FIG. 7 is a schematic diagram of the motion performance of the light source in FIG. 6 .

8 and 9 are schematic diagrams of embodiments of the present invention.

Fig. 10 is a schematic diagram of another embodiment of the present invention.

Fig. 11 is another schematic structural view of the utility model.

FIG. 12 is a schematic representation of the light source shown in FIG. 11 .

FIG. 13 is a schematic diagram of another embodiment of the light guide plate in FIG. 12 .

FIG. 14 is a schematic diagram of another embodiment of the light guide plate in FIG. 13 .

FIG. 15 is a schematic diagram of yet another embodiment of the light guide plate in FIG. 14 .

Fig. 16 is an A-A sectional view of Fig. 15 .

【Detailed ways】

In order to further understand the structure of the present utility model and the effect that can be achieved, it is described as follows in conjunction with the drawings:

First of all, please refer to Figure 6, a light guide plate with uniform light source diffusion of the present invention, the light guide plate 3 is a light-transmitting sheet body, with a light-emitting surface 31, a light-emitting surface opposite to the light-emitting surface 31 The reflective surface 32 at the position, and at least one incident surface 33 .

The light output surface 31 is used for the output of the light source, and the reflective surface 32 is provided with a plurality of light guide points (not shown) for reflecting the light source and changing the traveling direction of the light source. The light incident surface 33 is used for receiving light from The light source of the LED 34 transmits the light source received by it to the inside of the light guide plate 3 . Wherein, the light incident surface 33 in the light guide plate 3 is formed with many miniature light diffusers 331, and the light diffuser 331 has an arc surface 3311, and forms inclined surfaces 3312 near the roots on both sides of the arc surface 3311 to be aligned with the light incident surface. 33 phase connection.

Please refer to FIG. 7 again. When the light source of the light emitting diode 34 passes through the light incident surface 33 of the light guide plate 3, after the light source passes through the curved surface 3311 of the light diffuser 331, the light source will generate left and right directions and multiple angles. Refraction, and when passing through the slope 3312 at the root of the two sides of the light diffuser 331, the light source is refracted in a left and right direction at a fixed angle; Diffused and transmitted toward the inside of the light guide plate 3, and the light source refracted by the range of the inclined surfaces 3312 on both sides of the light diffuser 331 is transmitted toward the inside of the light guide plate 3 in a fixed direction, so that the original light incident angle of the light emitting diode 34 can be reduced It can be opened and enlarged, and the light after opening will not be too concentrated in the same direction to produce bright lines, and then the point light source of the light-emitting diode 34 can be opened when it enters the light guide plate 3. A larger light emission can be opened. Angle, and can also show a uniform light source diffusion performance.

Referring to FIG. 8 again, the light diffuser 331 formed on the light incident surface 33 of the light guide plate 3 can also be formed continuously and without intervals, so as to achieve a denser arrangement and exert greater light source diffusion. efficacy.

Also, as shown in Figure 9, the setting of the light diffuser 331 can also be formed by the light-incident surface 33 being recessed inside the light guide plate 3, and the light-emitting diode 34 can also be formed by the curved surface 3311 and the inclined surface 3312 that are recessed inward. , the original incident angle of the light is enlarged, and uniformly diffused into the interior of the light guide plate 3 .

And as shown in FIG. 10 , the light diffusers 331 recessed from the light incident surface 33 to the light guide plate 3 can also be arranged in a continuous and non-interval manner, further making them denser and beneficial to the diffusion of light sources.

Also, in order to further make the light source of the light-emitting diode 34 easier to form a better diffusion performance inside the light guide plate 3, please refer to FIG. A plurality of regularly arranged V-shaped light diffusion channels 332 are recessed inside the light guide plate 3 , and the light diffusion channels 332 are connected in a straight line between the light emitting surface 31 and the reflecting surface 32 . When the light source of the light-emitting diode 34 passes through the light incident surface 33 of the light guide plate 3, as shown in FIG. The inclined wall surface 3321 in the light diffusion channel 332 further enhances the diffusion efficiency of the light source.

When the utility model is implemented, please refer to FIG. 13 , the surface of the light diffuser 331 of the light guide plate 3 can be further formed with a large number of V-shaped light diffusion channels 332 recessed inside the light guide plate 3 and arranged irregularly. , can also achieve the purpose of increasing the diffusion efficiency of the light source.

Please also refer to FIG. 14 , when the light diffusers 331 on the light incident surface 33 of the light guide plate 3 are arranged at intervals, light diffusion channels can also be provided on the light incident surface 33 regions between the light diffusers 331 332 , and the light source emitted by the light emitting diode 34 can all obtain the diffusion effect of the light diffusion channel 332 .

Wherein, the light diffusion channel 332 is not only formed on the light incident surface 33 of the light guide plate 3, so that the light source can enter the light guide plate 3 to obtain diffusion, but the light diffusion channel 332 can also be formed on the light output surface 31, as shown in the figure As shown in 15 and 16, at the same time, it is linearly arranged in parallel with the light source in the straight forward direction of the light guide plate 3, and is formed with intervals or without intervals, so that when the light source emits light on the light exit surface 31, it can also be The uniform diffusion of the light source is obtained, and the diffusion efficiency of the light input and output of the light source is achieved at the same time.

To sum up, the utility model can really expand the light-emitting angle of the light-emitting diodes, and can also be diffused uniformly and transmitted to the inside of the light guide plate, and then diffused to emit light, which has industrial applicability. , and novel and progressive.

[Description of main component symbols]

1 surface light source device 11 light guide plate 12 reflector plate

13 light diffusion film 14 prism sheet

15 light sources 16 light emitting diodes

111 light emitting surface 112 reflective surface

113 light incident surface 114 bright area

115 dark areas 1121 light guide points

2 light guide plate 21 light exit surface

23 light incident surface 24 dark area

25 light-emitting diodes 26 bright lines

231 light diffuser 2311 bevel

3 light guide plate 31 light emitting surface 32 reflective surface

33 light incident surface 34 light emitting diode

331 light diffuser 3311 curved surface

3312 bevel 332 light diffusion channel

3321 wall

Claims (8)

1. A light guide plate with uniform diffusion of light sources, the light guide plate has a light output surface for the output of the light source; a reflective surface for reflecting the light source to change its direction of travel; a light input surface for receiving the light The light source output from the source is characterized in that: the light incident surface is formed with a plurality of miniature light diffusers, and the light diffuser has an arc surface, and the roots on both sides of the arc surface form an inclined plane to meet the light incident surface. connect. 2 . The light guide plate with uniform light source diffusion as claimed in claim 1 , wherein the light diffusers formed on the light incident surface of the light guide plate are arranged continuously and without intervals. 3 . 3. The light guide plate with uniform light source diffusion as claimed in claim 1, characterized in that: the surface of the light diffuser on the light incident surface of the light guide plate is also formed with a V-shaped light diffusion channel recessed inside the light guide plate, and The light diffusion channel is arranged in a straight line and connected between the light emitting surface and the reflecting surface. 4. The light guide plate with uniform light source diffusion as claimed in claim 1, 2 or 3, wherein the light diffuser is formed by recessing inside the light incident surface of the light guide plate. 5. The light guide plate with uniform diffusion of light sources as claimed in claim 3, characterized in that: the light diffusion channel formed on the surface of the light diffuser in the light incident surface is also formed in the area of the light incident surface without the light diffuser Location. 6. The light guide plate with uniform light source diffusion as claimed in claim 3, characterized in that: the light diffusion channel is also formed on the light emitting surface of the light guide plate, and is parallel to the linear direction of the light source in the light guide plate. arrangement. 7. The light guide plate with uniform light source diffusion as claimed in claim 3, wherein the light diffusion channels are arranged regularly. 8 . The light guide plate with uniform diffusion of light sources as claimed in claim 3 , wherein the light diffusion channels are arranged irregularly.

Images