TWI247175B - Liquid crystal display, backlight module and its light guide plate - Google Patents

Abstract

The invention provides a liquid crystal display, a backlight module and its light guide plate. The backlight module includes: a plurality of point light sources formed on a plate body; and a light guide plate having a light input plane and a light output plane. The light input plane has a protrusion part corresponding to each point light source and an arc-shaped trench is configured at a far end of the protrusion part. As a result, light emitted from the point light source enters the light input plane and the light is uniformly distributed to the protrusion part via the arc-shaped trench for being projected out from the light output plane.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight module, and more particularly to a backlight module and a light guide plate thereof for use in a liquid crystal display. Prior art With the improvement and improvement of display manufacturing technology, liquid crystal displays (L i qu id Crys ta 1 D i sp 1 ay, LCD) with small size and low radiation have gradually replaced traditional cathode ray tubes in recent years ( Cath〇de Ray hbe, CRT) display. In general, the backlight module of the conventional liquid crystal display (Cold Cathode Fluorescent Lamp, CCFL·) is mostly used as a light source. As shown in FIG. 1 , it is an exploded perspective view of the backlight module, which is disposed under the liquid crystal panel 14 . The backlight module is composed of a reflector 1 , a plurality of cold cathode lamps, and a light guide plate. 12. The diffuser plate 13 is constructed, and the combined side view is as shown in Fig. 2. The cold cathode lamp tube 丨丨 is used as a light source, and is emitted from the diffusing plate % to the liquid crystal panel 14 via the lower reflecting plate 10 or directly emitted light through the light guiding plate 12. However, since the backlight module of the above-mentioned conventional backlight module is a cold cathode lamp tube, the light guide plate needs to be diffused from the light source when the light guide plate is assembled, and the relative combination of the back light is 0. The thickness of the body is thicker; and since the cathode lamp is used as the light source, there is a distance between the tube and the tube, and the light surface is not changed by the dark ridge pattern. Therefore, a diffuser having a higher haze is used. Will cause the brightness to drop

1247175

Low 0 The invention includes that the composite light has a convex shape, and the upper groove uses the brightness of the light according to the distal end portion as a point plate, and the brightness is described in detail for the sake of easy understanding. The present invention is provided with a light source and a light source, which is less likely to be used in the present invention. The following is the following: The light source of the present invention is provided with a light exiting surface, and the convex light is illuminated into the cloth to protrude. In the arc-shaped groove of the light guide plate, the light source of the backlight module is less uniform. The above and the preferred one is preferably a base and the entrance portion is far from the above, and the protrusion is provided to help the thickness, so that a backlight module, a plate, and a light guide plate with a glossy surface are provided. An arc-shaped groove is formed at each end of the light source, and the light surface 'is emitted through the arc-shaped concave surface. Outlet, and light is scattered in the light guide plate at each of the protrusions; and since the use of the light-emitting diodes can be used, the other purposes, features, and advantages of the diffusion of the haze can be used, and the accompanying drawings , as an implementation

As shown in Fig. 3, in the rear light guide plate 22 of the present invention. ^ is a schematic diagram of the structure of the backlight module 2 of the present invention. The optical module 2 includes a plurality of light emitting diodes 2 匀 and a uniform methyl group

1247175 V. INSTRUCTIONS (3) Sodium acrylate (P〇lymethylmethacrylate, PMMA) or Polycarbonate (PC). The light guide plate 22 has a light entering

The surface 220 and the light-emitting surface 221 are provided with a number of protrusions 24 equal to the number of the light-emitting diodes 20 on the light-incident surface 220, and correspond to each of the light-emitting diodes 20 in a one-to-one manner. Referring to FIG. 4 together, the protruding portion 24 is a truncated cone 'contracted from the proximal end portion 240 to the distal portion 241, so that the cross-sectional area of the proximal portion 240 is greater than the distal end. The cross-sectional area of the portion 24i. In addition, an arcuate groove 2 4 2 is provided on the side of the distal end portion 241 corresponding to the light-emitting diode 2 俾, which is advantageous for uniform light scattering. On the light-emitting surface 2 2 1 , a light guiding pattern 23 such as a concave, convex line, a biting point or a wavy line may be provided to help the light enter the light-incident surface 220 of the light guide plate 22 through the light guide plate 22 . And the light guide pattern 2 3, emitted from the light surface 2 2 1 , can obtain a uniform surface light. Therefore, when the backlight module 2 is activated, a plurality of light emitting diodes 20 arranged in a matrix emit light through the arcuate grooves 242 of the corresponding protrusions 24, and the arcuate grooves 24 4 serve as a concave lens. The received light is dispersed by the concave lens principle and diffused by the distal end portion 242 of the protruding portion 24 to the proximal end portion 240 and then transmitted to the light incident surface 22 of the light guide plate 22, and finally emitted to the light exit surface 221 to be uniformly obtained. The light of the face. As shown in Fig. 4, in the present embodiment, the convex portion has its proximal end portion 2

The cross-sectional shape of the distal end portion 24 i is a circular shape with a smaller area. However, in the present invention, the shape of the protruding portion is not limited to a circular shape. For example, hexagonal or other shapes of 5& and 5b. As shown in Figures 5a and 5b, a projection of another embodiment is shown

1247175

Part 2 4 structure 'The bulge Qiu 9', Gan, 匕-自自, 兮, 土山°4, its proximal end 240, the cross-sectional shape is hexagonal, the distal end portion 2 4 Γ p丨The rabbit is r-shaped groove 242, and thus, a projection 24, which is shaped like a honeycomb-like cloth C plate 22, is disposed at the end portion 241', and is disposed in the light guide plate. In the aspect mode, the light source can be completely dispersed to the sixth embodiment. The liquid crystal device 3 using the backlight module of the present invention is a two-pole S-face 30, a T-diffusion sheet 31, a light guide plate 22, and a plurality of:乂 one: , /, the middle light guide plate 22 and the plurality of light-emitting diodes 20 are i: set i ί will not be described here, λ is mainly in the light guide plate 22 ^ 2 κ political sheet 31, the diffusion sheet 31 has diffusion The effect of light can make the party more uniform, and a liquid crystal panel 30 is disposed above the diffusion sheet 31 to form a liquid crystal display 3. Thus, the light of each of the light-emitting diodes can be emitted through the light guide plate 22 through the diffusion sheet 31, and finally, can be uniformly emitted from the liquid. In the above, the present invention can provide a embossing portion at the light incident surface of the diffusing plate and a point light source by using the illuminating diode, so that the diffusing plate is assembled without a gap between the light source and the light source, so that the backlight module is used. The thickness of the group is thinner. However, according to the structure design of the light-emitting diode with the protruding portion, the light source 9 is relatively uniform. Therefore, a diffuser having a lower haze can be used, and the luminance does not disappear. The invention has been disclosed in its preferred embodiments as described above, and is not intended to limit the invention. It is intended to be a part of the invention, and the invention may be modified and modified in a manner that does not depart from the spirit and scope of the invention. The scope is subject to the definition of the scope of the patent application attached. μ °

0773-A30018TW(Nl); P91209;mike.ptd

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a conventional backlight module; FIG. 2 is a schematic plan view of a conventional backlight module; FIG. 3 is a cross-sectional view of a backlight module of the present invention; FIG. 5a is a plan view showing a convex portion of another preferred embodiment of the present invention, and FIG. 5b is a perspective view showing a convex portion of another preferred embodiment of the present invention; The figure is a plan view of a liquid crystal display of the present invention. DESCRIPTION OF REFERENCE NUMERALS 1 4 to liquid crystal panel, 11 to cold cathode lamp; 1 3 to diffuser, 2 〇 to light emitting diode; 2 1 to substrate; 2 2 1 to light emitting surface; 2 4 0 to near end; 4 2 ~ arcuate groove 3 ~ liquid crystal device; 3 1 ~ diffuser. 1 ~ direct type backlight module 10 0 ~ reflector; 12 ~ light guide; 2 ~ backlight module; 22 ~ light guide; 2 2 0 ~ light into the face; 24, 24' ~ convex; 2 4 1~ Distal portion; 2 3 ~ light guide pattern; 3 0 ~ liquid crystal panel;

0773-A30018TW(Nl);P91209;mike.ptd第8页

Claims (1)

1247175 VI. Patent application scope 1. A backlight module comprising: a plurality of point light sources disposed on a substrate; and a light guide plate having a light incident surface and a light exit surface, wherein the light incident surface corresponds to each The point source has a protrusion at the point, and a groove is formed on the protrusion corresponding to one side of the point source. 2. The backlight module of claim 1, wherein the recess is an arcuate recess. 3. The backlight module of claim 1, wherein the point source is a light emitting diode. 4. The backlight module of claim 1, wherein the projection is a frusto-conical structure. 5. The backlight module of claim 1, wherein the protruding portion has a distal end portion and a proximal end portion, wherein a cross section of the proximal end portion and a cross section of the distal end portion are The shape is circular, and the cross-sectional area of the distal end portion is smaller than the cross-sectional area of the proximal end portion. 6. The backlight module of claim 1, wherein the protruding portion has a distal end portion and a proximal end portion, the proximal end portion has a hexagonal cross section, and the distal end portion The cross-sectional area is less than the cross-sectional area of the proximal portion. 7. The backlight module of claim 1, further comprising: a diffusion sheet disposed on a light emitting surface of the light guide plate. 8. The backlight module of claim 1, wherein a light guiding pattern is further disposed on a light emitting surface of the light guiding plate. 9) The backlight module of claim 8, wherein the guide 0773-A30018TW(Nl); P91209; mike.ptd Page 9 1247175 VI. Patent application f - The light pattern is a concave and convex pattern. The backlight module of claim 1, wherein the light guide plate is &Polymethylmethacrylate (PMMA) or carbonated g (p〇iycarb〇nate, pc) . The backlight module of claim 1, wherein a liquid crystal panel is further disposed above the diffusion sheet. 1 2 · A liquid crystal display, comprising: a plurality of point light sources, which are arranged on a substrate; a light guide plate having a light incident surface and a light exiting surface, wherein the light incident surface has a convex portion corresponding to each of the point light sources, and a concave surface is disposed on a surface of the convex portion corresponding to the point light source; The diffusion plate is disposed above the light guide plate; and a liquid crystal panel is disposed above the diffusion plate. The liquid crystal display of claim 1, wherein the distal groove is an arcuate groove. The liquid crystal display of claim 2, wherein the point light sources are light emitting diodes. The liquid crystal display of claim 2, wherein the projection is a head-cone structure. The liquid crystal display according to claim 12, wherein the / protruding portion has a proximal end portion and a distal end portion of the distal end portion of the distal end portion and the horizontal portion of the distal end portion The cross-section is circular, and the cross-sectional area of the end portion of the end portion is smaller than the cross-sectional area of the proximal portion. 1 7 · The liquid crystal display of claim 12, wherein 〇773- Delete 18 Move _;?9 battle (4) _ Page 10 1247175 6. Patent application scope The protruding portion has a proximal end portion and a distal end portion. The transverse wearing surface of the proximal end portion has a hexagonal shape, and the lateral loading area of the distal end portion is smaller than the proximal end portion. The p-system 1 8 is the j-night crystal display according to claim 12, further comprising a light guiding pattern on the light-emitting surface of the light guide plate. The liquid crystal display of claim 18, wherein the light guiding pattern is a concave-convex pattern. '20 · The liquid crystal display device according to claim 12, The light guide plate is a polymethylmethacrylate (PMMA) or a polycarbonate (PC) 〇21·- a light guide plate having a light incident surface and a front surface, and the light entrance surface Having at least one projection, a groove is formed on the distal end of each of the projections. 2 2. The light guide according to item 2 of the patent application, wherein the light is below the entrance surface Further, at least one point light source is disposed, and each of the point light sources corresponds to the light incident surface of each of the protruding portions. 〃 2 3 · The light guide according to the second aspect of the patent application, wherein the light guides The groove is an arc-shaped groove. 2 4 · The light guide according to item 2 of the patent application, wherein the point source is a light-emitting diode. 2 5 · If the patent application scope is item 2 The light guide, wherein the protrusion is a frustoconical structure. 2 6 · If applying for a patent The light around a second prong of the guide, wherein the projection 0773-A30018TWF(Nl);P91209;mike.ptd 11th tribute 1247175 VI. Patent application scope ^ 'The exit has a distal end portion and a _ proximal end portion, wherein the transversely worn surface of the retracted end is The cross-sectional area of the distal end face at the proximal end. The U-loading area is a light guide plate according to Item 2, wherein the protrusion//, each end portion and a proximal end portion have a cross section of six sides. The cross-sectional area of the shape 'and the distal end portion of the reading is smaller than the cross-sectional area of the proximal end portion. The light guide plate of claim 21, further comprising: a diffuser disposed on the light exit surface of the light guide plate. The light guide plate of claim 2, wherein the light guide plate is & Polymethylmethacrylate (PMMA) or Polycarbonate (PC). The light guide plate of claim 2, wherein a light guide pattern is further disposed on the light exit surface of the light guide plate. The light guide plate of claim 30, wherein the light guide pattern is a concave-convex texture. 0773-A30018TWF(Nl);P91209;mike.ptd第12页