TWI240120B - Backlight module and liquid crystal display using it - Google Patents

Abstract

The present invention is to provide a backlight module and a liquid crystal display using it. The backlight module has a light guide plate, at least a cold cathode tube, a light reflector, a diffuser and a prism sheet, wherein the cold cathode tube is disposed adjacent to the light guide plate and has a plural concave structures. The light reflector is disposed outside the tube to reflect the light and the diffuser and the prism sheet are disposed on the light guide plate sequentially.

Description

1240120

The technical field to which the invention belongs particularly relates to an application. The present invention relates to a backlight module of a liquid crystal display. The previous technology has shown improvements and improvements in manufacturing technology, and is ready to be used. 丨 radiation and other characteristics of liquids :: & has a small volume, low =) 2 has gradually replaced the traditional cathode ray tube (Cath- ㈣ Γ 6 ^ Display. Generally speaking, the backlight of LCD is known

, Cry ack LlSht ing Module) mostly use cold cathode lamp

Cold Cathode Fluorescent Lamp (CCFL ·) as light source0

For general backlight modules, most of the light sources are placed on the side of the light guide plate or under the α, and a lamp tube is used to achieve the effect of light diffusion, as shown in FIG. 1f, which is a lamp tube 10 Schematic diagram placed on the side of the light guide plate u, the lamp 10 emits a light source into the light guide plate 11 and diffuses the light source through the light guide plate i 丨 to emit uniform surface light. However, because the structure of the light tube used in the conventional backlight module is a straight tube design, and there will be a non-light emitting area at the end of the light tube, the light cannot be diffused to the entire area of the light guide plate 1 1. Dark areas 12 may be generated at the upper and lower corners, and even if a u-shaped tube 10 ′ as shown in FIG. 2 is used, there are still dark areas a at the corners of the light guide plate 11. In addition, since the lamp officials 10 and 10 'are straight tubes, the light emitting area of the light source is concentrated in the longitudinal direction of the side of the light guide plate 11 and the brightness is low. Sometimes, two lamps are required to achieve the effect of improving the brightness.

1240120 V. Description of the invention (2) In the invention, due to the structure of the light module, one lamp board is required. The curved knot has a light guide plate that is parallel to the light source, and the elimination of the dark spiral portion of the light source is larger than the original. And at least one lamp tube, each of which is on one side of the light guide plate, and the tube body of each lamp tube has multiple bends to enlarge the light source divergence area and increase the degree. The invention further provides a liquid crystal display device, which has a light guide plate, a tube, a light source reflector, a diffuser, a cymbal, and a lamp tube on the liquid crystal surface corresponding to the light guide plate, and has a multiple curved structure. The reflector is arranged on the outside of the lamp tube, and is located at the mouth facing the lamp tube, and a light reflecting substance is provided on the inside to reflect the light from the light source. The diffusion sheet is disposed above the light guide plate to diffuse light; 稜鏡 is disposed above the diffusion sheet to increase brightness. On the cymbal and LCD panel. According to the present invention, the lamp tube has a multi-curved structure to increase the divergent area. 'Let the light diffuse to the entire area of the light guide plate, and the situation of the area'. At the same time, except for the light source in the longitudinal direction of the original straight tube, The brightness of the yellow part of the tube can make the brightness of the lamp tube more traditional than that of the official body, which can reduce the number of lamp tubes and reduce the manufacturing cost. In order to make the above and other objects, features, and advantages of the present invention more comprehensible ', a preferred embodiment is given below, and the accompanying drawings are described as follows:

1240120 V. Description of the invention (3) Implementation mode As shown in Fig. 3a, it is a schematic diagram of the structure of the backlight module 2 of the present invention. The backlight module 2 of the present invention includes a light guide plate 20, at least one cold cathode lamp tube 2, a light source reflector 24, a diffusion sheet 26, and a cymbal sheet 28. The light guide plate 20 may be made of polymethylmethacrylate (PMMA) or polycarbonate (Polycarbonate, PC). The light guide plate 20 has left and right sides 0.

The cold-cathode lamp tube 22 has a multi-curved lamp tube structure. In the following embodiments, a spiral lamp tube 220 is used as an example, and it is provided on the right side of the light guide plate 20. As shown in Figure 3b, the spiral lamp tube 220 can effectively increase the light source divergence area and increase the light source divergence brightness. Please refer to FIG. 3 a again. In addition, a light source reflection 2 4 ′ is further provided outside the light tube 22, and a light reflecting substance is provided on the inner side facing the light tube 22 to emit light from the light tube 22. The light is reflected to the light guide plate 20 to improve the light utilization efficiency of the lamp tube 22. The light guide plate 22 is further provided with components such as a diffusion sheet 26 and a diamond lens 28. Finally, an outer frame 29 can be used to package the light guide plate 20, the lamp tube 22, the light source reflector 24, the diffusion sheet 26, and the prism sheet 28. Cover it up.

The structural design of the lamp tube determines the area of the spiral lamp tube according to the brightness. As shown in Figure 4a, the spiral lamp tube 22 can be designed in the middle portion, so that the center brightness of the panel 20 can be improved. The spiral lamp tube 220 may also be provided at both ends of the lamp tube 22 (for example, as shown in FIG. 4b), which can effectively solve the dark areas at the corners of the two ends of the panel. The spiral tube structure can also be applied to direct type backlight modules, please refer to

V. Description of the invention (4) Fig. 5 is a three-dimensional schematic diagram of the direct type backlight module 3, which is a plurality of lamp tubes 30 disposed below a light guide plate 32, each of which is 30 It has a spiral lamp tube structure 300, which can effectively increase the light source divergence area and increase the brightness of the light source divergence. 'This can reduce the number of lamp tubes 30 used. Components such as a diffusion sheet 34 and a diamond lens 36 are further provided above the light guide plate 32 to diffuse light and increase brightness. FIG. 6 is an exploded perspective view of a liquid crystal display device 4 using the backlight module of the present invention. The liquid crystal display has a liquid crystal panel 40 and a backlight module 2 grouped below the liquid crystal panel 40. The backlight module Group 2 includes a light guide plate 20, at least one cold-cathode lamp tube 2, a light source reflector 24, a diffusion sheet 26, and a cymbal sheet 28. The combination of the above-mentioned backlight module 2 and its functions are shown in FIG. 3, respectively. As mentioned above, it will not be repeated here. With this, using a multi-curved lamp tube structure, such as the spiral square-shaped lamp officer 220 in the above embodiment, the divergent area of the light source can be increased, so that the light can be diffused to the entire area of the light plate 20, and the situation of dark areas can be eliminated. At the same time, in addition to the light source in the longitudinal direction of the original straight tube body, the tube body 22 of the spiral portion can increase the brightness of the lateral portion, so that the brightness of the lamp tube 22 is greater than that of the original traditional straight tube body, which can reduce The number of lamps used, and effectively reduce manufacturing costs.

The Jit invention has been disclosed as above with a preferred embodiment, but it is not used to: Gen: Ben "'Any person who is familiar with this skill, without departing from the hair and enclosing β', can make some changes and retouching. The attached patent application shall be as defined in the scope of application. Χ 5

0773-A30157TW (Nl); P92111; mi le6277.ptd 1240120

Brief description of the drawing. The first figure is the conventional edge-lit backlight module and its light source is standing. The second figure is the conventional side-lit backlight module using u ~ 'drawing; soil' and & < Figure 3a of the example is a first schematic plan view of an edge-lit backlight module of the present invention; three-dimensional UI is a first-preferred embodiment of its edge-lit backlight module according to the present invention.

Figure 4a is a schematic plan view showing the edge-lit backlight module tube of the present invention at the central portion; Figure 4b is a schematic plan view showing the edge-lit backlight module tube of the present invention at the two ends of the tube Figure 5 is a three-dimensional schematic diagram of the direct-type backlight module of the present invention. Figure 6 is a symbol description of the liquid crystal display using the backlight module of the present invention. 2 ~ backlight module; 2 4 ~ light source reflector; 28, 36 ~ cymbal; 3 ~ direct type backlight module; 40 ~ liquid crystal panel. 11, 2 0, 3 2 ~ light guide plate; 10 '~ U-shaped tube; 2 2 ~ cold cathode tube; 2 6, 3 4 ~ diffuse sheet; 2 2 0, 3 0 0 ~ spiral lamp tube 4 ~LCD Monitor;

Claims (1)

1240120--Case No. 931〇〇_ Jin Dou Kao | 3i t ^ s_Corrective Services _ 6. The scope of Shen Yanqing's patents 1. A backlight module 3 H] a light guide plate; and 'a lamp tube, the lamp tube is set It is adjacent to the light guide plate and has a multi-curved structure. 2 · The backlight module according to item 1 of the scope of patent application, wherein the multi-curved structure is a spiral structure. 3. The backlight module according to item 2 of the scope of patent application, wherein the lamp tube is disposed on at least one side of the light guide plate. 4. The backlight module according to item 2 of the scope of patent application, wherein the lamp tube is disposed on the bottom surface of the light guide plate. 5 · The backlight module according to item 2 of the scope of patent application, which further includes a light source reflector, which is provided outside the lamp tube, and has an opening facing the lamp tube, and a light reflecting substance is provided on the inside. Used to reflect the light from the light source into the light guide plate. 6. The backlight module according to item 2 of the scope of patent application, further comprising a diffusion sheet, which is arranged above the light guide plate. 7. The backlight module according to item 6 of the scope of patent application, further comprising at least one diaphragm, which is arranged above the diffuser. 8. The backlight module according to item β of the patent application scope, wherein a liquid crystal panel is further provided above the diffusion sheet. 9. The backlight module according to item 2 of the scope of patent application, wherein the spiral structure is provided at the center of the lamp tube. 1 〇 The backlight unit according to item 2 of the scope of patent application, wherein the spiral structure is provided at both ends of the lamp tube 鄯 1240120 A backlight module includes a light guide plate and a light tube, wherein the light tube is disposed adjacent to the light guide plate and has a multi-curved structure; and a liquid crystal panel is disposed above the backlight module. 1 2 · The liquid crystal display according to item 11 of the scope of patent application, wherein the multi-curved structure is a spiral structure. 1 3 · The liquid crystal display according to item 12 of the scope of patent application, wherein the lamp tube is provided on at least one side of the light guide plate. 14 · The liquid crystal display according to item 12 of the scope of patent application, wherein the lamp tube is provided on the bottom surface of the light guide plate. 1 5 · The liquid crystal display according to item 12 of the scope of patent application, wherein the backlight module further comprises a light source reflector, which is arranged outside the lamp tube, has an opening facing the lamp tube, and is provided on the inner side. A light reflecting substance is used to reflect the light from the light source into the light guide plate. 16 · The liquid crystal display device according to item 12 of the scope of the patent application, wherein the backlight module further includes a diffusion sheet, which is disposed above the light guide plate. 17. The liquid crystal display device according to item 16 of the scope of patent application, wherein the backlight module further includes at least one cymbal, which is disposed above the diffusion sheet. 0773-A30157TWFl (Nl) .ptc 10th tribute