Backlight module and liquid crystal display device
A technology of backlight module and backlight, which is applied in optics, optical components, nonlinear optics, etc., and can solve the problems of low light utilization efficiency, light intensity attenuation, and low brightness of liquid crystal display devices, etc.
Inactive Publication Date: 2019-08-13
BOE TECH GRP CO LTD +1
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Problems solved by technology
However, APF cannot directly change the incident light from natural light state to linearly polarized light, and the light intensity will also be greatly attenuated in the process of reflecting back and forth the light that does not pass through the axis.
Therefore, the light utilization efficiency in the backlight module is not high, and the brightness of the liquid crystal display device is not high.
Moreover, the high cost of APF makes it difficult to reduce the cost of backlight modules
Method used
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[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0051] The components or elements shown in the accompanying drawings are marked as follows:
[0052] 1, 2, 5 liquid crystal display device;
[0053] 10, 100 liquid crystal display panel;
[0054] 11 lower polarizer;
[0055] 12. 120 array substrates;
[0056] 13, 130 liquid crystal layer;
[0057] 14. 140 color film substrate;
[0058] 15, 150 upper polarizer;
[0059] 20, 200, 500 backlight modules;
[0060] 210 backlight;
[0061] 220 Division of Diffusion;
[0062] 230 prism part;
[0063] 240 polarizing beam splitters;
[0064] 241 beam splitting incident surface;
[0065] 242 the first beam splitting exit surface;
[0066] 243 second beam splitting exit surface;
[0067] 244 be...
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Abstract
A backlight module and a liquid crystal display device are disclosed. The backlight module comprises a backlight source, a beam splitter and a light beam conversion portion. The beam splitter converts light from the backlight source into a first and second polarization light beam. The light beam conversion portion converts the first polarization light beam into a third polarization light beam through total reflection, and outputs the second and third polarization light beam through a light exit side. Alternatively, the light beam conversion portion converts the first and second polarization light beam into a fourth and fifth polarization light beam through total reflection, and outputs the fourth and fifth polarization light beam through the light exit side. To this end, light from the backlight source is efficiently applied to irradiate a liquid crystal display panel, and the brightness of the liquid crystal display panel significantly improves.
Description
technical field [0001] The invention relates to the technical field of liquid crystal display, and in particular to a backlight module and a liquid crystal display device. Background technique [0002] Such as figure 1 As shown, the liquid crystal display device 1 mainly includes a liquid crystal display panel 10 and a backlight module 20 . The liquid crystal display panel 10 is, for example, a Thin Film Transistor Liquid Crystal Display (TFT-LCD), and includes a lower polarizer 11 , an array substrate 12 , a liquid crystal layer 13 , a color filter substrate 14 and an upper polarizer 15 . The light emitted by the backlight in the backlight module 20 is usually natural light. When the light passes through the lower polarizer, at least half of the light intensity is lost, so that the utilization rate of the light emitted by the backlight source is low, and the brightness of the liquid crystal display panel 10 is low. Increasing the intensity of the light emitted by the bac...
Claims
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IPC IPC(8): G02F1/13357
CPCG02F1/13362G02B27/283G02F1/133607G02F1/133606
Inventor 方明雷伟郑亮亮蔡斯特
Owner BOE TECH GRP CO LTD