TW573146B - Backlight module - Google Patents

Description

573146 V. Description of the invention (1) [Field of the invention] The present invention relates to a backlight module for a liquid crystal display device, and particularly to a reflective cover having a plurality of light sources and a plurality of reflective curved surfaces corresponding to the number of light sources. [Background of the Invention] In recent years, as the degree of integration of parts in various parts of computers has continued to increase, the requirements for peripheral products have continued to move toward light, thin, short, small, and low power requirements. Compared with other display devices, such as C r τ, L C D is a device with small size and low power consumption. Since the liquid crystal molecules themselves are spontaneous light-emitting devices, LCDs need to be launched in addition to the LCD screen. At present, the light source commonly used in LCD screens is cold-cathode tubes (c〇id

Cathode Fluorescent Lamp-CCFL) and hot cathode; ^ r u ^ \ Hot

Cathode Fluorescent Lamp-HCFL). And the most important-North light module ’is generally classified into two parts: direct part lighting type and side-lighting type (~, / part 1 ighting type) according to the position of the light source. In the lower irradiation type, the knife edge is uniformized by a diffusion sheet and then diffused into the liquid crystal panel, while the other light is borrowed from the surface, and the side illumination type is provided by a light guide plate (L · GP, 1 ght square guide plate) ) Into a piece of light source.

Page 4 573146 V. Description of the invention (2) As shown in Fig. 1 ', it shows a traditional side-illumination backlight module. The lamp tube 10 is used as a light source, and is surrounded and surrounded by a reflection cover 20. A light guide plate 30 is disposed on one side of the lamp tube 10 to disperse and homogenize the reflected light. An optical composite plate composed of a diffuser plate 50, a lower fascia plate 60 and an upper prism plate 70 is provided on the upper surface of the light guide plate 30, and a lower surface of the light guide plate 30 is provided with a reflective plate 40. . The diffuser plate 50 is used to improve the incident light of the liquid crystal panel (not shown). The reflecting plate 40 is used to avoid light leakage from the light toward the lower portion of the light guide plate 30, and to reflect the light perpendicular to the upper portion of the light guide plate 30. The lower fascia plate 60 and the upper fascia plate 70 are used to change the course of light travel. It consists of a series of sequential triangular grooves or hemispherical grooves. In order to protect the lower prism plate 60 and the upper prism The appearance of the plate 70 is provided with a protective plate 80 on the upper plate 70, and the liquid crystal panel is provided on the protective plate 80.

573146 V. Description of the invention (3) ^ Inverse ^ In the backlight module as described above, the light emitted from the lamp tube 10 is reflected by 1 2 0, and then the image on the screen is displayed through the guide The light and the light of the diffuser plate 50 are revealed. In addition, the light emitted from the lamp tube 10 is prevented from leaking by the presence of the reflection plate 40, and the light is scattered toward the light guide plate 30. Next, the diffuser plate 50 is used to homogenize the light and fi =, and a specific selected angle is used to make the light pass through the upper and lower ridges 70 to change the course of travel and to shoot vertically toward the liquid crystal panel. However, in order to increase the brightness of the current backlight module to meet various needs, some studies have proposed to adopt a more conventional method (as shown in Figure 2A, the component number 21 is a lamp, and the measured brightness L = moo cd / m2) larger lamps (as shown in Figure 2B, component number 2 2 0 is the lamp), or two lamps (as shown in Figures 2 C and 2 D, component number 2 3 0, 2 4 0, 2 5 0, and 2 6 0 are all lamps) to meet the requirements of high brightness, but no matter how to use the method in Figure 2B or 2C, while increasing the brightness, It also increases the thickness and weight of the backlight module (2B brightness L = 330 0 cd / m2, 2C brightness L = 45 0 0 cd / m2), so it does not meet the current design trends and requirements. In the second diagram D, because the two lamps are arranged in parallel with each other, the situation in which the lamps absorb each other's light energy is very serious, especially the lamps 2 60, which are arranged at the back, most of them The emitted light is all absorbed or blocked by the lamp tube 250, and the brightness data measured by this backlight module is only about 2700 cd / m2.

573146 V. Description of the invention (4) Therefore, in order to overcome the above-mentioned shortcomings and take into account the thin and light weight of the backlight module, we need to develop a new structure to solve the above problems. [Objective and Summary of the Invention] According to the defects caused by the conventional method described above, the main purpose of the present invention is to provide an improved structure of a backlight module to achieve the purpose of thinning and lightening. Still another object of the present invention is to provide a reflective cover for a backlight module, which has a specially designed reflective curved surface to reduce the situation of mutual absorption of light energy between the lamps, and appropriately reflects the light to the guide in the backlight module. Light plate to achieve the purpose of improving brightness. According to the above object, the present invention provides a backlight module, the main structure of which includes a light guide plate for guiding and collecting light; a first light source and a second light source, which are disposed on one side of the light guide plate and are connected with The light guide plate is arranged in a line; and a reflecting cover completely surrounds the two light sources, and two ends thereof are respectively connected and fixed to two ends of the same side of the light guide plate, wherein the inside of the reflecting cover has a first The reflective curved surface and a second reflective curved surface respectively correspond to the two light sources, and the reflective curved surface is used to reflect the light emitted by the two light sources to the light guide plate. The two light sources are properly separated by the above-mentioned first reflective curved surface and the second reflective curved surface, so that the light source is avoided.

573146 V. Description of the invention (5) The situation of absorbing energy to each other, and each reflecting light to the light guide plate to improve the overall brightness. Furthermore, because the light guide plate, the first light source and the second light source are arranged in a line, Therefore, the thickness of the backlight module is reduced, and the weight of the backlight module is relatively reduced. The purpose and many advantages of the present invention will be fully disclosed by the following detailed description of the specific embodiments and with reference to the accompanying drawings. [Detailed description of the invention] Some embodiments of the present invention will be described in detail below, in which different parts of the elements are not drawn according to the actual size. Certain scales are related to other scales than they are exaggerated to provide a clearer description to help those familiar with the art to understand the invention. Embodiment: As shown in the third figure, the main structure of the backlight module of the present invention includes a light guide plate 3 0 0 for guiding and collecting light; a first light source 3 2 0 and a second light source 3 30, the light source may be a cold cathode tube, a light-emitting diode, or other suitable light source. The two light sources are arranged on one side of the light guide plate 300 and aligned with the light guide plate 300 (in the third In the figure, from left to right are the light guide plate 3 0 0, the first light source 3 2 0 and the second light source 3 3 0); and a reflective cover 3 1 0, which completely surrounds and surrounds the first light source. 3 2 0 and first

573146 V. Description of the invention (6) Two light sources 3 3 0, and the two ends thereof are respectively connected and fixed to two ends of the same side of the light guide plate 3 0 0. It can be seen from the third figure that the reflective cover 310 has a first reflective curved surface 3 1 1 and a second reflective curved surface 3 1 3, which respectively correspond to the first light source 3 2 0 and the second light source 330, and the first reflection The curved surface 311 and a second reflective curved surface 3 1 3 have a protrusion 3 1 2 at the connection point. In this embodiment, the height of the protruding 3 1 2 is not higher than the horizontal plane of the axis X between the centers of the two light sources. The reflective curved surface 3 1 1 and 3 1 2 are used to reflect the light emitted from the first light source 3 2 0 and the second light source 3 3 0 to the light guide plate 3 0 0. The fourth figure is a perspective view of a backlight module of the present invention. From the third and fourth figures, the above-mentioned first reflective curved surface 311 and second reflective curved surface 313 appropriately separate the two light sources, thereby avoiding the situation where the light sources absorb energy from each other, and at the same time, reflecting the light to The light guide plate 300 has improved the overall brightness. According to the measurement, the brightness measured in this embodiment is 4 300cd / m2. Compared with the conventional one, the brightness is obviously improved. Furthermore, because The light guide plate 300, the first light source 32o, and the second light source 33o are arranged in an array. Therefore, they all have the weight of the light module. The thickness of the 5 groups can be reduced, and the above-mentioned preferred embodiments, which are only completed under the patent application scope of the present invention, are also reduced. They are not intended to limit the scope; all others do not depart from the scope of the present invention. The disclosed spiritual changes or modifications should be included in the following patent applications

573146 V. Description of invention (7).

Page 573 146

Brief description of the drawings [Simplified description of the drawings] The first picture is a schematic diagram of the backlight module in the conventional technique; the second A to two D diagrams are the schematic diagrams of the four backlight modules in the conventional technique; the third diagram is A sectional view of the backlight module of the present invention; and a fourth view is a perspective view of the backlight module of the present invention. Main part number: 10 tube 2 0 reflector 30 light guide 4 0 reflector 5 0 diffuser 6 0 lower 稜鏡 7 0 upper 稜鏡

8 0 Protective plate 90 Mold base 2 1 0 Light tube 2 2 0 Light tube 2 3 0 Light tube 2 4 0 Light tube

Page 11 573146 Brief description of the diagram 2 5 0 lamp tube 2 6 0 lamp tube 3 0 0 light guide plate 3 1 0 reflection cover 3 1 1 first reflection surface 3 1 2 connection protrusion 313 second reflection surface 3 2 0 One light source 3 3 0 The second light source X The axis connecting the two light source centers Η · page 12

Claims (1)

573146 / Everyone ’s tongue 6. Scope of patent application [Scope of patent application] 1. A backlight module includes: a light guide plate for guiding and collecting light; one or more light sources provided in the One side of the light guide plate is aligned with the light guide plate; a reflection cover completely surrounds the one or more light sources, and two ends of the light guide plate are respectively connected and fixed to two light guide plates on the same side. An end portion, wherein the reflective cover has one or more reflective curved surfaces inside, and each reflective curved surface respectively corresponds to the one or more light sources respectively, and is used to emit the light emitted from the one or more light sources; Light is reflected to the light guide plate. 2. The backlight module according to item 1 of the scope of patent application, wherein the number of the reflective curved surfaces corresponds to the number of the light sources. 3. The backlight module according to item 2 of the scope of patent application, wherein the curved surface of each reflective curved surface may vary depending on the shape of the light source corresponding to its respective entity. 4. The backlight module according to item 1 of the patent application scope, wherein the light source may be a cold cathode tube. 5. The backlight module according to item 1 of the scope of patent application, wherein the light source Page 13 573146 Sixth, the scope of patent application Can be light-emitting diodes. 6. A backlight module comprising: a light guide plate for guiding and collecting light; two light sources provided on one side of the light guide plate and aligned with the light guide plate; a reflecting cover, completely Ground surrounds the two light sources, and two ends thereof are respectively connected and fixed to two ends of the same side of the light guide plate, wherein the reflection cover has a first reflective curved surface and a second reflective curved surface, respectively. Corresponding to the two light sources, the light emitted from the two light sources is reflected to the light guide plate. 7. The backlight module according to item 6 of the scope of patent application, wherein the arcs of the curved surfaces of the first reflective curved surface and the second reflective curved surface may be different depending on their respective light source shapes. 8. The backlight module according to item 7 in the scope of the patent application, wherein the first reflective curved surface and the second reflective curved surface are connected to each other, and the height of the protrusion at the connection does not exceed the horizontal plane of the connecting axis between the centers of the two light sources. . 9. The backlight module according to item 6 of the patent application scope, wherein the light source may be a cold cathode tube. 10. The backlight module according to item 6 of the scope of patent application, wherein the light source Page 14 573146 6. Scope of patent application May be light emitting diode. 1IH1I Page 15