TWI323814B - Direct type backlight module - Google Patents

Description

IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a direct type backlight module. [Prior Art] ^Thai species is not spontaneously finely set, and its age is mainly achieved by the light-leveling or non-passing of the light-spinning part of the secret cake. Therefore, it is usually necessary to use external light guides such as the back edge group. The wire group can guide the light beam emitted by the external light source to the display panel. Since the innovation of the weight and volume of the display device is achieved by the effective flattening of the display, the back wire group plays an important role as an effective paste source. Before the display volume is flattened, how to use the characteristics of the light to make the _ area of the back total group have sufficient and uniform brightness, which is the key direction of the improvement of the backlight module structure. The direct type backlight module of the prior art is as shown in the first figure. The direct type backlight module 10 includes a box body 14, a plurality of light sources 13, a plurality of supports 12 and a seesaw u. The plurality of light sources 13 are arranged on the bottom surface of the casing 14 and the bottom surface of the casing 14 is provided with a reflective film 15. The inspection panel 11 is disposed at the opening of the casing 14. The plurality of building blocks 12 are located on the bottom surface of the casing 14. Between the diffusing plate 11 and the diffusing plate 11, the diffusing plate 11 is used for the branch. The direct-type backlight module 10 of the prior art only uses the reflective film 15 on the bottom surface of the casing 14 to provide the upward light-emitting rate of the light source 13, but causes the light directly above the light source 13 of the liquid crystal display panel to directly emit light, which makes the brightness brighter. However, the brightness of the region between the two light sources is dark, causing the problem of uneven brightness of the planar light source, and thus the image brightness exhibited by the liquid crystal display is not uniform. In order to solve the phenomenon that the brightness of the backlight module 10 is uneven, another direct type backlight module 20 is provided. As shown in the second figure, the direct type backlight module 20 includes a box body 24, a plurality of light sources 23> 22 and diffusion plate 21. The reflector 22 is located in the casing 24. The plurality of light sources 23 are juxtaposed on the bottom surface 25 of the reflector 22. The diffuser 21 is disposed at the opening of the casing 24. Since the reflector 24 is disposed in the casing 24 of the backlight module 20, the reflection effect of the light is increased, and by designing the shape of the reflector 22, the light can be controlled to illuminate the area between the two light sources, thereby improving the area between the two light sources. The brightness plays a certain role in the uniformity of the light luminance of the planar light source. However, the brightness of the light above the opposite light source 23 of the liquid crystal display panel is still brighter than that of the light source between the two light sources, resulting in a problem that the light intensity of the planar light source is still not uniform, and thus the liquid

Claims (1)

Revision date 10, application patent scope: 98· 5_ 2 2 L A direct type backlight module, including: = light guide plate, the bottom surface of the disproportion is provided with a groove, the scale is smooth, and the light guide plate is The two ends of the groove are provided with a notch; the plurality of branches of the guiding plate are erected in the gap of the light guiding plate; 2 the light source 'the plurality of light sources are respectively arranged by the plurality of branches in the guide 2 · 2 patent application scope item i The straight down type back weaving set, wherein the support frame and the outer support frame, the light source is inserted into the inner support frame, and the inner support frame is inserted into the gap of the inner inner branch light plate. , the frame to the outer frame is installed in the direct type of the second item according to the second item, wherein the backing group further comprises a side reflection piece, the side reflection piece is disposed on the outer support frame on. / 匕4· 3 = The direct type of the group described in the above paragraph 1, wherein the groove is defined by the _ side and the fifth type of the straight type back paper group described in item 4, wherein the _ group further includes A top reflective sheet is disposed on the top surface of the light source and the recess. H specializes in tearing down the straight-type back fiber group, correcting, and arranging the bottom reflection sheet, which is disposed on the bottom surface of the light guide plate. </ RTI> The direct-type back-up group according to the invention of claim 2, wherein the back-and-shoulder is a diffusion sheet, and the diffusion sheet is disposed on a light-emitting surface side of the light guide plate. The direct-type back-up set according to the seventh aspect of the invention, wherein the backing wire 9 栝-lighting sheet is disposed on the side of the diffusing film away from the light-emitting surface of the light guide plate. The first article of the syllabus is the sequel to the sequel, the towel, the back secret group further includes a frame and a back plate 'fixing the light guide plate and the light source between the upper frame and the back plate. The straight-type back paper set according to item 9, wherein the upper frame cut material is a plastic S, and the towel is made of metal. Specifically, she is directed to the direct-type backing group described in the item i, wherein the light source is a cold cathode camp light [S3 9 1323814. 13. The direct type backlight module of claim 1, wherein the light guide plate The material is polydecyl methacrylate or polycarbonate.