LED backlight module
A technology of backlight module and LED light bar, which is applied in the direction of optics, light guide, light source, etc., can solve the problems of affecting the backlight efficiency, the light guide plate is damaged, and the distance between the light guide plate and the LED becomes larger, so as to improve the light coupling efficiency and ensure Effect of coupling distance
Active Publication Date: 2014-04-16
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
Such a variation will have two risks: ① LED reliability risk, LED will be damaged by light guide plate; warping
[0008] In the prior art, in order to avoid warping of the light guide plate due to thermal expansion or moisture absorption expansion, it is necessary to reserve enough movement for the light guide plate, so that the distance between the light guide plate and the LED becomes larger, so that the light coupling distance will decrease. reduce, greatly affecting the efficiency of the backlight
Method used
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[0036] see Figure 6 to Figure 10 , Image 6 It is a three-dimensional schematic diagram of a backplane of a preferred embodiment of the LED backlight module of the present invention; Figure 7 for Image 6 Top view of the mid-backplane; Figure 8 It is a three-dimensional schematic diagram after removing the light guide plate for a preferred embodiment of the LED backlight module of the present invention; Figure 9 It is a top view of the light guide plate of a preferred embodiment of the LED backlight module of the present invention; Figure 10 It is an assembly diagram of a preferred embodiment of the LED backlight module of the present invention.
[0037] The LED backlight module of the present invention mainly includes a light guide plate 30, an LED light bar 31, a back plate 32, and a heat sink 33. The LED light bar 31 is fixed on the heat sink 33 adjacent to the light incident side of the light guide plate 30, and There is an upwardly extending light guide plate po...
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An LED backlight module comprises a light guide plate (30), an LED lamp bar (31), a back plate (32) and a heat radiation element (33). The LED lamp bar (31) is fixed on the heat radiation element (33) with being close to the light incidence side of the light guide plate (30), the heat radiation element (33) is provided with a light guide plate positioning column (34) which is relatively fixed with the heat radiation element (33) and extends upward, the light guide plate positioning column (34) penetrates through the light guide plate (30) upward to relatively position the light guide plate (30) on the heat radiation element (33), the heat radiation element (33) is movably arranged on the back plate (32) along the light incidence direction, and the heat radiation element (33) shifts along with the expansion or contraction of the light guide plate (30) so as to maintain the light coupling distance between the light guide plate (30) and the LED lamp bar (31). The LED backlight module can avoid the warp of the light guide plate (30) caused by mechanism interference after the light guide plate (30) is expanded by heating or moisture absorption, can avoid the light guide plate (30) from being collided with the LED after the light guide plate (30) is expanded by heating or moisture absorption so as to avoid the LED failure, and can further ensure the light coupling distance between the light guide plate (30) and the LED, thus improving the light coupling efficiency.
Description
technical field [0001] The invention relates to liquid crystal display technology, in particular to an LED backlight module. Background technique [0002] Existing LED backlight modules used in liquid crystal display technology are mainly divided into direct-type backlight modules and side-type backlight modules. For side-lit LED backlight modules, with the continuous improvement of LED efficiency, the design of LED backlights has also continued to evolve, from the initial four-side light input, to double-side light input, to single-side light input, current development and future development. The direction of all will point to the single short side light incident mode. [0003] The side-type LED backlight is to arrange the LED crystal grains around the edge of the LCD panel, and then match the light guide plate, so that when the LED backlight is illuminated in partitions, the light emitted from the edge of the LCD panel passes through the light guide plate (LGP) It is sen...
Claims
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IPC IPC(8): F21S8/00F21V17/10F21Y101/02
CPCG02B6/0068G02B6/0091G02B6/0085G02B6/0001
Inventor 贺虎
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD