CN1138175C - Light guide structure of liquid crystal display - Google Patents

Abstract

A light guide structure of LCD is prepared as setting light guide module on liquid crystal module, setting refraction unit at one side of light guide plate of light guide module, setting middle position of refraction unit to be convex outwards, setting light guide bar at reverse position of light guide slot on refraction unit, setting light outgoing surface at one side of light guide bar near to light guide plate and being an arc concave surface, setting light outgoing surface at middle position to be thinner and thickness at two ends of light guide bar to be larger, setting light guide bar to be a reflection surface at another side of light outgoing surface, setting reflection surface to be multiple reflection slots and setting arc reflection covers at adjacent position of reflection surface and setting LED light source at two ends of light guide bar separately.

Description

Light guide structure of liquid crystal display

technical field

The invention relates to a light guide structure of a liquid crystal display, in particular to a light guide structure of a liquid crystal display with a light guide module having light gathering and light refraction structures.

Background technique

Currently, front-lit liquid crystal displays use high-brightness LEDs instead of CCFLs as light sources, because LEDs are more power-saving. However, LEDs are a point light source, and it is necessary to convert it into a uniform light source, as shown in Figure 5. Produced by the known light guide module, when this kind of liquid crystal display is in use, because the light emitting surface 811 of its light guiding rod 81 is a plane, the LED light source 82 is reflected from the reflective surface 812 to the light guide plate 83, and part of the light is reflected from the light emitting surface 811. The surface 812 reflects, then reflects to the light guide plate 83, and is reflected by the light guide plate 83 to the liquid crystal module (not shown in the figure), so that the liquid crystal module has brightness. Since the light-emitting surface 811 of the light-guiding rod 82 is planar, it has a small reflection angle α to the light, and the light is easily scattered (the light-emitting angle is about ±45°), resulting in more light rays diverging to the outside of the light guide plate 83 , Therefore, the loss of light is large, which also causes the brightness of the liquid crystal display to be poor. In addition, during the propagation of light, the loss caused by light scattering is not easy to make the light propagate to the other end of the light guide rod 81, so that the light reflected to the light guide plate 83 will be somewhat uneven, and the brightness of the liquid crystal display will also decrease. uneven.

There is another kind of liquid crystal display light guide module (as shown in FIG. 6 ) for improving the above-mentioned uneven brightness. Wedge shape, wherein the light-emitting surface 93 extends obliquely. Although the inclined state of the light-emitting surface 93 helps the light of the LED light source 92 to be reflected to the other end of the light guide rod 91 to increase the uniformity of the light, however, after the light is reflected There is still much diffusion to the outside of the light guide plate 94, and the brightness of the liquid crystal display is still in a poor state.

Contents of the invention

The main purpose of the present invention is to solve the above problems and provide a light guide structure of a liquid crystal display. Through the design of the light-emitting surface of the light guide rod, a part of the light can be reflected more uniformly and the scattering of the light after reflection can be reduced. Refraction is formed at the refraction portion of the light guide plate, so that the reflected light and direct light are refracted and concentrated on the light guide plate, and the utilization rate of light is improved, so that the brightness of the liquid crystal display is improved, and the brightness uniformity is also better.

Another object of the present invention is to provide a light guide structure of a liquid crystal display in which both sides of the light guide plate are integrally connected with both ends of the light guide rod to increase the convenience of manufacture.

The present invention provides a light guide structure of a liquid crystal display, which is arranged on a front light type liquid crystal display, and the liquid crystal display has a liquid crystal module, and a light guide module is arranged on the top of the liquid crystal module, and the light guide module has a light guide A light guide plate and a light guide rod, and a light source is provided at both ends of the light guide rod, which is an LED point light source. The light guiding groove forms a first surface and a second surface, and a predetermined angle is formed between the first surface and the second surface, and the light guiding plate has a Refraction part, the refraction part has outward arc-shaped protruding thickness in the middle position, and gradually decreases to both sides, in addition, the refraction part has a light guide rod at the opposite position of the light guide groove, and the light guide rod is connected with the plurality of light guide rods The light guide grooves extend in the same direction, the light guide rod has a light exit surface on the side close to the light guide plate, the light exit surface is an arc-shaped concave surface, the thickness of the light guide rod is relatively thin in the middle position of the light exit surface, and at the The thickness of both ends of the light guide rod is relatively large, and the light guide rod has a reflective surface on the other side of the light-emitting surface, and the reflective surface has a plurality of light reflection grooves. The adjacent position of the surface is provided with a coaxial and arc-shaped reflector.

Description of drawings

Fig. 1 is a schematic perspective view of the structure of the first embodiment of the present invention.

Fig. 2 is a schematic top view of the structure of the first embodiment of the present invention.

Fig. 3 is a schematic side view of the structure of the first embodiment of the present invention.

Fig. 4 is a schematic top view of the structure of the second embodiment of the present invention.

FIG. 5 is a schematic diagram of the top surface of a known liquid crystal display module.

FIG. 6 is a schematic top view of another known liquid crystal display module.

Detailed ways

Please refer to FIG. 1 to FIG. 3 , the present invention is set on a front-light liquid crystal display 1 , and the liquid crystal display 1 has a flat liquid crystal module 10 . A light guide module 20 is disposed on the top of the liquid crystal module 10 , and the light guide module 20 has a light guide plate 21 . The top of the light guide plate 21 has a plurality of light guide grooves 22 regularly arranged in the same direction, and the light guide grooves 22 form a first surface 221 and a second surface 222, and a predetermined angle. In addition, the light guide plate 21 has a refraction portion 23 at the side where the plurality of light guide grooves 22 are arranged in the same direction. side decrement. In addition, the refraction part 23 has a light guide rod 24 at the opposite position of the light guide groove 22, the light guide rod 24 extends in the same direction as the plurality of light guide grooves 22, and the light guide rod 24 is on the side close to the light guide plate 21 It has a light emitting surface 241 . The light-emitting surface 241 is an arc-shaped concave surface, and the curvature of the light-emitting surface 241 is between 0.001 and 0.01. The light-emitting surface 241 in the middle position should make the thickness of the light-guiding rod 24 thinner, and make the light-guiding rod 24 Thickness is greater at both ends. In addition, the light guiding rod 24 has a reflective surface 242 on the other side of the light emitting surface 241 , and the reflective surface 242 has a plurality of reflective grooves 243 , and the opening angle of the reflective grooves 243 is between 80°-100°. In addition, the light guide rod 24 is on the other side of the light guide plate 21, and is located at the adjacent position of the reflective surface 242. An arc-shaped reflector 25 coaxial with the light guide rod 24 is provided, and the two ends of the light guide rod 24 are respectively A light source 26 is provided, and the light source 26 is an LED point light source.

Because, the present invention is a kind of liquid crystal display of front light type, it sends light X by means of these two light sources 26, because light X is for the emission of diffuse type, so some light X just can be directed to the reflection of this light guiding rod 24 surface 242 , and is reflected by the reflective groove 243 of the reflective surface 242 , and radiates toward the light guide plate 21 to form reflected light Y1 . In addition, a part of the light X passes through the reflective surface 242 of the light guiding rod 24 , is reflected by the reflective cover 25 , and then passes through the light guiding rod 24 to be emitted to the light guiding plate 21 to form reflected light Y2 . Furthermore, since the light source 26 emits diffusely, even if another part of the light X is directed towards the light-emitting surface 241 of the light guide rod 24, a part of the light X can directly pass through the light-emitting surface 241 to form a direct beam X. light W, and another part of the light X will be reflected by the light-emitting surface 241, and shoot to the reflecting surface 242, and the reflecting surface 242 will also reflect the light, and then pass through the light-emitting surface 241 to form reflected light Y3, and reach the light guide plate 21. Because the above-mentioned reflected light Y1, Y2, Y3 and direct light W all shoot to this light guide plate 21, because the refraction portion 23 of this light guide plate 21 is in the state of a convex lens, it can reflect the reflected light Y1 that is still incompletely incident directly. , Y2, Y3 and direct light W form optically converging refraction, and form refracted light Z1, Z2, Z3, Z4 that are relatively close to straight, and these refracted light Z1, Z2, Z3, Z4 are formed on the light guide plate 21 The downward reflection or direct radiation to the liquid crystal module 10 makes the liquid crystal module 10 have relatively uniform brightness.

It should be noted that the light emitting surface 241 of the light guiding rod 24 has an inwardly concave curvature, so the light X is easily reflected here, and the scattered light X is reflected toward the middle position of the reflecting surface 242 of the light guiding rod 24 . Although the light X is lost during the travel (that is, it travels less to the middle part of the light guide rod 24), the light output surface 241 of the present invention can reflect a part of the light to the reflective surface 242, and these light rays pass through the reflective surface 242 with a larger opening. The reflective groove 243 reflects, so that the angle of the reflected light is between ±20° and 30°, so that the reflected light is more concentrated, so the utilization rate of light can be improved, so the brightness of the liquid crystal display can be improved. And the brightness uniformity is also better.

In summary, the present invention designs the curved surface of the light-emitting surface 241 of the light guide rod 24 to make the reflected light X more uniform and reduce the scattering of the reflected light X, and then form a The refraction makes the reflected light Y1 , Y2 , Y3 and the direct light W refract and concentrate on the light guide plate 21 , so as to improve the utilization rate of light.

Of course, there are many other examples of the invention in which only the details vary. Please refer to FIG. 4 , which is a second embodiment of the present invention, wherein, both sides of the light guide plate 21 of the light guide module 20 are connected to the two ends of the light guide rod 24 with a connecting portion 33 to form a whole, The light guide bar 24 and the light guide plate 21 of the light guide module 20 can be integrally formed during manufacture, so as to increase the convenience of manufacture.

Claims (4)

1, a kind of guide structure of LCD, it is to be located on the LCD of light type before, has a Liquid Crystal Module on this LCD, the top of this Liquid Crystal Module is provided with an optical waveguide module, this optical waveguide module has an optical plate and an optical rod, the two ends of this optical rod then are respectively equipped with a light source, and this light source is to be a LED pointolite, it is characterized in that:

The top of this optical plate has a plurality of regularly arranged photoconduction grooves of same direction that are, this photoconduction groove then forms one first and second, form predetermined angle between this first and second, and this optical plate has a refraction part in the identical lateral location of the orientation of these a plurality of photoconduction grooves, this refraction part has the outwards thickness of arcuation protrusion in the centre position, and successively decrease to both sides, in addition, this refraction part has an optical rod at the reverse position of this photoconduction groove, this optical rod is to extend with the same direction of these a plurality of photoconduction grooves, this optical rod has an exiting surface in the side near this optical plate, this exiting surface is the concave surface of an arc, this exiting surface makes the thinner thickness of this optical rod in the centre position, and it is bigger at the thickness at these optical rod two ends, this optical rod has a reflecting surface at the another side of this exiting surface again, this reflecting surface has a plurality of reflective grooves, this optical rod is at the opposite side of this optical plate in addition, and is provided with coaxial with it an and curved reflex housing in the adjacent position of this reflecting surface.

2, according to the guide structure of claims 1 described LCD, the curvature of exiting surface that it is characterized in that this optical rod is between 0.001～0.01.

3, according to the guide structure of claims 1 described LCD, the opening angle that it is characterized in that this reflective groove is between 80 °～100 °.

4, according to the guide structure of claims 1 described LCD, the both sides that it is characterized in that the optical plate of this optical waveguide module are that the two ends with this optical rod interconnect with a junction respectively and are integral.

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