CN1393730A

CN1393730A - Light guide structure of LCD

Info

Publication number: CN1393730A
Application number: CN01129480A
Authority: CN
Inventors: 黄国瑞
Original assignee: Wintek Corp
Current assignee: Wintek Corp
Priority date: 2001-06-21
Filing date: 2001-06-21
Publication date: 2003-01-29
Anticipated expiration: 2021-06-21
Also published as: CN1138175C

Abstract

A light guide structure for LCD is dislcosed. Its light guide module on liquid crystal module has a light guide plate with a refraction part at its one side. The refraction part has a projected center and a light guide rod opposite to light guide slot. The light guide rod has a concave arc surface for outuptting light, a reflecting surface on the back of the said arc surface and with many reflecting slots, and arc-shape reflecting cover near the reflecting surface. The LED as light source is at both ends of light guide rod.

Description

The guide structure of LCD

The present invention is the guide structure of relevant a kind of LCD, refers to that especially a kind of optical waveguide module tool light is assembled and the guide structure of the LCD of light refractive structure.

Now, preceding light type LCD replaces CCFL as light source with high-brightness LED, be to have characteristic than power saving because of LED, but, LED is a pointolite, convert thereof into uniform light source, promptly there is known optical waveguide module as shown in Figure 5 to produce, this kind LCD in use because the exiting surface 811 of its optical rod 81 is a plane, thus led light source 82 by reflecting surface 812 to optical plate 83 reflections, and part light is reflected to reflecting surface 812 by this exiting surface 811, reflect to the Liquid Crystal Module (not shown) again to optical plate 83 reflections, and by optical plate 83, and make Liquid Crystal Module have brightness.Because the exiting surface 811 of optical rod 82 is plane, it has less reflection angle alpha to light, light easily forms scattering (rising angle be about ± 45 °), causes divergence of beam more to the light in optical plate 83 outsides, therefore, the loss of light is bigger, also causes the luminance range of LCD.In addition, light because of the loss that light scatter caused, and is difficult for making the other end of light ray propagation to optical rod 81 in communication process, so will make the light that reflexes to optical plate 83 more or less unequal, and the brightness of LCD also can be unequal.

Other has a kind of for improving the LCD optical waveguide module (as shown in Figure 6) of above-mentioned brightness disproportionation, its optical rod 91 is to have bigger external diameter near led light source 92, and the external diameter of the other end is less, form a wedge shape, wherein exiting surface 93 is for tilting to extend, though the heeling condition with exiting surface 93 helps the light of led light source 92 to be reflected onto the other end of optical rod 91, to increase the uniformity coefficient of light, yet, still have many diffuse outside after light is reflected, and make the brightness of LCD still be not good state to optical plate 94.

Fundamental purpose of the present invention, be to solve the above problems and a kind of guide structure of LCD is provided, exiting surface curved design by optical rod, make a part of light can be after reflection, comparatively evenly and the scatter radiation situations after the light reflection is reduced, the refraction part at optical plate forms refraction again, make the refraction of this reflected light and direct light, concentrate on optical plate, and the utilization factor of light is promoted, and the brightness of LCD is improved, and brightness uniformity is also better.

Another object of the present invention is to provide a kind of both sides of optical plate and optical rod two ends one to interconnect, with the guide structure of the LCD that increases easily manufactured property.

1. the present invention provides 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, 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 thickness that outside arcuation protrudes 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 is 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.

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

Fig. 2 is the end face synoptic diagram of first embodiment of the invention structure.

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

Fig. 4 is the end face synoptic diagram of second embodiment of the invention structure.

Fig. 5 is known LCD MODULE end face synoptic diagram.

Fig. 6 is another kind of known LCD MODULE end face synoptic diagram.

See also Fig. 1 to Fig. 3, the present invention is located on the LCD 1 of light type before, and this LCD 1 has one and is plane Liquid Crystal Module 10.The top of this Liquid Crystal Module 10 is provided with an optical waveguide module 20, and this optical waveguide module 20 has an optical plate 21.The top of this optical plate 21 has a plurality of regularly arranged photoconduction grooves 22 of same direction that are, and 22 of this photoconduction grooves form one first 221 and second 222, forms predetermined angle between these first 221 and second 222.Also have this optical plate 21 to have a refraction part 23 in the identical lateral location of the orientation of these a plurality of photoconduction grooves 22, this refraction part 23 has the thickness of more outside circular-arc protrusion in the centre position, and successively decreases to both sides.In addition, this refraction part 23 has an optical rod 24 at the reverse position of this photoconduction groove 22, and this optical rod 24 is to extend with these a plurality of photoconduction groove 22 same directions, and this optical rod 24 has an exiting surface 241 in the side near this optical plate 21.This exiting surface 241 is the concave surface of an arc, and the curvature of this exiting surface 241 is between 0.001～0.01, and this exiting surface 241 will make the thinner thickness of this optical rod 24 in the centre position, and makes the thickness at these optical rod 24 two ends bigger.Also have this optical rod 24 to have a reflecting surface 242 at the another side of this exiting surface 241, this reflecting surface 242 has a plurality of reflective grooves 243, and the opening angle of this reflective groove 243 is between 80 °～100 °.This optical rod 24 is at the opposite side of this optical plate 21 in addition, and the adjacent position that is positioned at this reflecting surface 242 is provided with coaxial with it an and curved reflex housing 25, and the two ends of this optical rod 24 then are respectively equipped with a light source 26, and this light source 26 is LED pointolites.

Because, the present invention is a kind of LCD of preceding light type, it is by means of this two light source 26 X that emits beam, because light X is the emission for diffusion type, therefore some light X direct reflecting surface 242 of this optical rod 24 of directive just, and 243 reflections of the reflective groove by reflecting surface 242, and directive optical plate 21 forms reflected light Y1.The light X of some can pass the reflecting surface 242 of optical rod 24 in addition, and forms reflection by this reflex housing 25, sees through this optical rod 24 again, and this optical plate 21 of directive forms reflected light Y2.Moreover, because this light source 26 is the emissions for diffusion type, therefore, even the light X of another part is the exiting surface 241 of this optical rod 24 of directive, wherein the light X of some can directly pass this exiting surface 241 and form direct light W, and the light X of another part then can be by these exiting surface 241 reflections, and this reflecting surface 242 of directive, and this reflecting surface 242 also can reflect this light, passes this exiting surface 241 again and formation reflected light Y3, and arrives this optical plate 21.Because above-mentioned reflected light Y1, Y2, Y3 and direct light W can this optical plate 21 of directive, because the refraction part 23 of this optical plate 21 is the convex lens state, therefore it can be to the still non-complete refraction that directly forms poly-optical activity to the reflected light Y1, the Y2 that inject, Y3 and direct light W, and form convergence relatively directly to refract light Z1, Z2, Z3, Z4, these refract lights Z1, Z2, Z3, Z4 also form downward reflection or direct directive Liquid Crystal Module 10 at this optical plate 21, make this Liquid Crystal Module 10 have brightness uniformly.

It should be noted that: the exiting surface 241 of this optical rod 24 is to have the curvature that concaves, so light X easily forms reflection at this, with the light X of scattering to the reflection of the centre position of these optical rod 24 reflectings surface 242.Though light X loss to some extent in advancing (it is less promptly to march to optical rod 24 center sections), but 241 of exiting surfaces of the present invention can reflex to the light of a part reflecting surface 242, these light are by bigger reflective groove 243 reflections of reflecting surface 242 openings, the catoptrical beam angle that makes its formation is between ± 20～30 °, and make reflected light comparatively concentrated, the utilization factor of light is promoted, so, the brightness of LCD is promoted, and brightness uniformity is also better.

In sum, the present invention passes through the curved design to the exiting surface 241 of optical rod 24, make light X after reflection, comparatively evenly and the scatter radiation situations after the light X reflection is reduced, refraction part 23 at optical plate 21 forms refraction again, make this reflected light Y1, Y2, Y3 and direct light W refraction again, concentrate on optical plate 21, and the utilization factor of light is promoted.

Certainly, the present invention also has many examples, therebetween the only variation on the details.See also shown in 44 figure, it is the second embodiment of the present invention, wherein, the both sides of the optical plate 31 of this optical waveguide module 30 are that the two ends with this optical rod 32 interconnect with a junction 33 respectively and are integral, make the optical rod 32 of this optical waveguide module 30 can be one-body molded during fabrication, to increase the convenience made from optical plate 31.

Claims

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.