Back light module and liquid crystal display device

[0018] Please refer to FIG. 2, which is a cross-sectional view of the first embodiment of the liquid crystal display device of the present invention. The liquid crystal display device 2 includes a backlight module 20 and a liquid crystal panel 29 disposed opposite to the backlight module 20. The backlight module 20 includes a The light guide plate 21 of the light incident surface 211, a light source 24 arranged adjacent to the light incident surface 211, and a frame 25 accommodating the light guide plate 21 and the light source 24.

[0019] The light source 24 includes a strip-shaped support 242, a plurality of light-emitting diodes 240 arranged on the strip-shaped support 242, and two reflective elements 23 arranged adjacent to the light-emitting diode 240. The plurality of light emitting diodes 240 are arranged in rows. The strip support 242 is a column on which a circuit is arranged, and an external power source illuminates the light emitting diode 240 through a wire (not shown) and the circuit on the strip support 242. The two reflective elements 23 are connected to the strip support 242 and are integrally formed, are respectively located on two sides of the strip support 242, and form a cavities structure with the strip support 242. The reflective element 23 can prevent the light emitted by the light-emitting diode 240 from escaping outward, and try to make the light of the light-emitting diode 240 concentrate into the light guide plate 21 to improve the light utilization efficiency.

[0020] When assembling the light source 24, it is only necessary to set the light source 24 in the frame 25, so that the light emitting diode 240 is arranged corresponding to the light incident surface 211 of the light guide plate 21.

[0021] Compared with the prior art, the light-emitting diodes 240 of the light source 24 are arranged on a strip-shaped support 242, and the reflective element 23 and the strip-shaped support 242 are integrally formed, that is, the reflective element 23 is formed in the The strip support 242 is integrated into the strip support 242 when it is formed. Therefore, during the assembly process, the light source 24 can be directly installed in the frame 25 to make the light-emitting diode 240 and the light guide plate 21 enter the light The faces 211 are opposite, which reduces assembly steps and facilitates assembly. Moreover, the light-emitting diode 240 does not contain mercury, which has the advantage of environmental protection.

[0022] Please refer to FIG. 3, which is a cross-sectional view of the light source shown in the second embodiment of the liquid crystal display device of the present invention. The difference between the liquid crystal display device 3 and the liquid crystal display device 2 of the first embodiment lies in the strip support of the light source 34 342 includes a first side wall 343, a second side wall 344 opposite to the light incident surface of the light guide plate, and a third side wall 345 opposite to the first side wall 343. The first side wall 343 and the second side wall 344 and the third side wall 345 are connected in sequence. The light emitting diode 340 is disposed on the second side wall 344, and a circuit is disposed on the second side wall 344 to provide power to the light emitting diode 340. The first side wall 343 and the third side wall 345 are respectively provided with a reflective element 33 on the side close to the light emitting diode 340. The reflective element 33 is coated or sprayed with a reflective material on the first side wall 343 and the third side wall 345. The side wall 345 is formed to prevent the light emitted from the light emitting diode 340 from escaping outward, and to make the light of the light emitting diode 340 concentrated into the light guide plate as much as possible to improve the light utilization efficiency.

[0023] Please refer to FIG. 4, which is a cross-sectional view of the light source shown in the third embodiment of the liquid crystal display device of the present invention. The difference between the liquid crystal display device 4 and the liquid crystal display device 2 of the first embodiment is that the strip support 442 includes a The first side wall 443 and the second side wall 444 opposite to the light incident surface of the light guide plate, the light emitting diode 440 is arranged on the second side wall 444, and a circuit is arranged on the second side wall 444 to provide power for the light emitting Diode 440. A reflective element 43 is provided on the side of the first side wall 443 close to the light emitting diode 440, and the reflective element 43 is formed on the first side wall 443 by plating or spraying a layer of reflective material.

[0024] Please refer to FIG. 5, which is a cross-sectional view of the light source shown in the fourth embodiment of the liquid crystal display device of the present invention. The difference between the liquid crystal display device 5 and the liquid crystal display device 2 of the first embodiment is that the strip support 542 includes a The first side wall 543 and the second side wall 544 opposite to the light-incident surface of the light guide plate. The light emitting diode 540 is arranged on the second side wall 544, and a circuit is arranged on the second side wall 544 to provide power for light emitting. Diode 540. A first reflective element 531 is provided on the side of the first side wall 543 close to the light emitting diode 540, and the first reflective element 531 is formed on the first side wall 543 by plating or spraying a layer of reflective material. A second reflecting element 532 is provided on the side of the strip support 542 opposite to the first side wall 543, and the second reflecting element 532 is integrated into the strip support 542 when the strip support 542 is formed. , And the strip support 542 are integrally formed.

[0025] Please refer to FIG. 6, which is a cross-sectional view of the light source shown in the fifth embodiment of the liquid crystal display device of the present invention. The difference between the liquid crystal display device 6 and the liquid crystal display device 3 of the second embodiment is that the light-emitting diode 640 is arranged in the first embodiment. On a side wall 643, a circuit is provided on the first side wall 643 to provide power to the light emitting diode 640. A reflective element 63 is provided on the side of the second side wall 644 and the third side wall 645 close to the light emitting diode 640, and the reflective element 63 is coated or sprayed with a layer of reflective material on the second side wall 644 and the third side. The wall 645 is formed.

[0026] Please refer to FIG. 7, which is a cross-sectional view of the light source shown in the sixth embodiment of the liquid crystal display device of the present invention. The difference between the liquid crystal display device 7 and the liquid crystal display device 3 of the second embodiment lies in: A side wall 743, a second side wall 744, and a third side wall 745 are adjacent to each other in a circular arc transition.

[0027] However, the backlight module is not limited to the above-mentioned embodiments. For example, the side wall of the strip-shaped support and the adjacent side wall can also be chamfered, and the number of light-incident surfaces of the light guide plate can be set according to needs. The adjustment that the light source is arranged adjacent to the light incident surface is not limited to the above-mentioned embodiment.