Backlight module for liquid crystal display
A liquid crystal display and backlight module technology, which is applied in optics, instruments, electric light sources, etc., can solve the problems of collimation of outgoing light, low light utilization rate, etc., and achieves low manufacturing difficulty and cost, high light source utilization rate, and collimation. good effect
Active Publication Date: 2013-08-07
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology
[0010] Aiming at the problems of low collimation of outgoing light and light utilization rate in the backlight module of the prior art, the present invention provides a backlight with high collimation of outgoing light, high utilization rate of light energy, large beam cross-section, and can eliminate black stripes. LCD backlight module
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0030] The invention provides a backlight module for liquid crystal displays capable of producing collimated beam expandable light, the structure of which is as follows Figure 3a and Figure 3b As shown, it includes a light source 20 , a light source reflection cover 21 , a wedge-shaped film 22 , a reflective film 23 , a prism film 24 , a beam expander film 25 and a liquid crystal screen 26 . The light source 20 is CCFL or LED. The wedge-shaped film 22 is a triangular wedge-shaped body including a first light incident surface 220 and a first light exit surface 221 and a second light exit surface 222, wherein the light source 20 is placed close to the first light incident surface 220, and the first light exit surface 221 and the second light exit surface The included angle α between the surfaces 222 is less than or equal to 5°. The reflecti...
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Abstract
The invention discloses a backlight module of a liquid crystal display. The backlight module for the liquid crystal display comprises a light source, a reflective film, a wedge film, a prism film and a beam expanding film. The wedge film comprises a first in-light surface, a first out-light surface and a second out-light surface, and the included angle between the first out-light surface and the second out-light surface is less than or equal to 5 degrees; the light source is arranged on one side of the first in-light surface; the reflective film is arranged on one side of the second out-light surface; and the prism film is arranged on one side of the first out-light surface and comprises a second in-light surface and a third out-light surface which are parallel to each other. The backlight module for the liquid crystal display is characterized in that the beam expanding film is arranged behind the first out-light surface, and the beam expanding film expands the light beam cross-sectional area of light emitted from the third out-light surface, converts the emitted light into light beams perpendicular to the parallel surface of the liquid crystal display to be incident on the liquid crystal display, so that the problems of light leak, color bias and low contrast of a traditional liquid crystal display can be improved.
Description
technical field [0001] The invention relates to a liquid crystal display, in particular to a backlight module used for a liquid crystal display. Background technique [0002] Since the 1970s, liquid crystal displays have been used due to their advantages of low cost, high resolution, and bright colors. Their applications are almost ubiquitous in electronic devices, ranging from small-sized watches to large-sized TVs. Today's liquid crystal displays have high resolution, compact structure, high brightness and low cost. However, despite more than 40 years of development and progress, liquid crystal displays still have problems such as low light source utilization, low resolution, and color shift due to the backlight they use. [0003] The liquid crystal in the liquid crystal display panel itself does not have luminous properties, and it uses a backlight module to provide a light source to achieve a display effect. Usually, liquid crystal displays use LED (light-emitting diod...
Claims
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Login to View More IPC IPC(8): G02F1/13357F21S8/00F21V13/00
Inventor 杨淑敏陈志明朱宗杰杨静吴永荣李同
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI