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Backlight device and liquid crystal display apparatus

A backlight device and light source technology, applied in the direction of lighting devices, lighting device components, optics, etc., to achieve good image quality, expand the color reproduction range, and suppress the increase in power consumption

Inactive Publication Date: 2012-12-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned structure, it is necessary to stack a plurality of light guide plates, and the size of the backlight unit is particularly large in the thickness direction of the device.

Method used

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  • Backlight device and liquid crystal display apparatus
  • Backlight device and liquid crystal display apparatus
  • Backlight device and liquid crystal display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] figure 1 It is a diagram schematically showing the configuration of a liquid crystal display device 100 that is a transmissive display device according to Embodiment 1 of the present invention. The backlight device according to Embodiment 1 includes a first backlight unit 2 and a second backlight unit 3 . For ease of understanding, the short side direction of the liquid crystal optical element 1 is defined as the Y-axis direction, the long side direction (direction perpendicular to the Y axis) of the liquid crystal optical element 1 is defined as the X-axis direction, and the direction perpendicular to the X-Y plane is defined as is the Z-axis direction. In addition, the display surface 1 a side of the liquid crystal display element 1 is defined as the +Z axis direction, and the upward direction of the liquid crystal display device (the upward direction when the screen of the liquid crystal display device 100 is installed facing the horizontal direction) is defined as ...

Embodiment approach 2

[0112] Figure 7 It is a diagram schematically showing the configuration of a liquid crystal display device (transmissive liquid crystal display device) 600 according to Embodiment 2 of the present invention. The backlight device according to Embodiment 2 includes a first backlight unit 2 and a second backlight unit 4 . The liquid crystal display device 600 of the second embodiment differs from the liquid crystal display device 100 of the first embodiment in that a second backlight unit 4 having a different structure is provided instead of the second backlight unit 3 of the liquid crystal display device 100 of the first embodiment. Except for this point, the liquid crystal display device 600 of the second embodiment is basically the same as the liquid crystal display device 100 of the first embodiment. exist Figure 7 , for the same as in Embodiment 1 ( figure 1 ) The result elements of the liquid crystal display device 100 described in ) are the same or the corresponding s...

Embodiment approach 3

[0117] Figure 8 It is a diagram schematically showing the configuration of a liquid crystal display device (transmissive liquid crystal display device) 700 according to Embodiment 3 of the present invention. The backlight device according to Embodiment 3 includes a first backlight unit 7 and a second backlight unit 3 . The liquid crystal display device 700 of the third embodiment is more suitable than the liquid crystal display device 100 of the first embodiment. In the liquid crystal display device 700 of Embodiment 3, the conditions of the light propagation portion are discussed in more detail and improved. In addition, in Figure 8 , the pair has the same as in Embodiment 1 ( figure 1 The structural elements used in ) are the same or the structural elements of the corresponding functions are marked with the same reference numerals. However, the structural elements described in detail in the third embodiment will be given new reference numerals, and the structural eleme...

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Abstract

A backlight device (100) is provided with first light sources (20a, 20b) and second light sources (10). The first light sources (20a, 20b) emit first light beams (22a, 22b) that are red laser beams. The second light sources (10) emit a second light beam (13) that is blue-green color light having a complementary-color relationship with the laser beam. The second light sources (10) comprise light-emitting diodes that emit blue light, and phosphors that absorb the blue light and emit green light.

Description

technical field [0001] The present invention relates to a backlight device for illuminating a liquid crystal display element from the backside of the liquid crystal display element using a laser light source, and a liquid crystal display device having the same. Background technique [0002] The liquid crystal display element of the liquid crystal display device itself does not emit light. Therefore, it is necessary to provide a backlight device on the back of the liquid crystal display element as a light source device for illuminating the liquid crystal display element. In recent years, the demand for thinner liquid crystal display devices has gradually increased, and edge-lit backlight devices have been widely used. Light is incident on the side of the light guide plate, thereby forming a planar light source. [0003] As a light source of a backlight device, a cold cathode fluorescent lamp (CCFL (Cold Cathode Fluorescent)) which can obtain white light by coating a phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21V9/16G02F1/13357F21Y101/02
CPCG02F1/133621G02B6/0068G02F1/133603G02F1/133615G02B6/0073G02B6/0076G02B6/0091G02B6/0058G02B6/002G02F2001/133614G02B6/0036G02B6/003G02B6/0061G02B6/0035G02F1/133624G02F1/133614
Inventor 西谷令奈笹川智广新仓荣二小岛邦子染谷润杉浦博明堤和彦长濑章裕
Owner MITSUBISHI ELECTRIC CORP
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