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Backlight unit and liquid crystal display device having the same

A technology of backlight unit and liquid crystal display, applied in optical components, light guides, optics, etc., can solve the problems of difficult LCD panels, difficult to obtain high brightness, and reduced price competitiveness.

Inactive Publication Date: 2007-11-14
LG PHILIPS LCD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an edge-type backlight unit is applied to a large-sized LCD device, it is difficult to obtain uniform brightness over the entire surface of the LCD panel
[0020] Also, since the lamp is disposed on one side of the backlight unit, and the light emitted from the lamp needs to pass through the light guide plate, it is difficult to obtain high brightness
[0021] The edge-type backlight unit in the prior art is provided with a lower diffuser plate, an upper diffuser plate, and a lower prism plate and an upper prism plate above the light guide plate, thereby increasing the thickness of the edge-type backlight unit
In addition, if the upper diffuser plate and DBEF are integrated, the price competitiveness will be reduced due to the expensive DBEF

Method used

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  • Backlight unit and liquid crystal display device having the same
  • Backlight unit and liquid crystal display device having the same
  • Backlight unit and liquid crystal display device having the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0042] 3 is an exploded perspective view showing the backlight unit according to the first embodiment of the present invention, and FIG. 4 is a perspective view showing the backlight unit after the assembly process according to the first embodiment of the present invention.

[0043] 3 and 4, the backlight unit according to the first embodiment of the present invention is provided with: a light guide plate 33 for guiding light emitted from a plurality of light-emitting lamps 31, and includes a light guide plate 33 arranged in one direction and combined with each lamp 31 ( join) a plurality of grooves 32; a plurality of light emitting lamps 31 are arranged in one direction and respectively located in the grooves 32 of the light guide plate 33; In addition, a reflection sheet 37 is provided under the light guide plate 33 .

[0044] The light emitting lamp 31 is formed of a cold cathode fluorescent (CCFL) lamp. Provided in each CCFL are: a first electrode 35a and a second electro...

no. 2 example

[0054] 5 is an exploded perspective view showing a backlight unit according to a second embodiment of the present invention.

[0055] As shown in FIG. 5 , the backlight unit according to the second embodiment of the present invention is provided with: a light guide plate 53 for guiding light emitted from a plurality of light emitting lamps 51 , and includes lamps arranged in one direction and combined with each lamp 51 a plurality of grooves 52; a plurality of light-emitting lamps 51 arranged in one direction and respectively located in the grooves 52 of the light guide plate 53; and a diffusion plate 54 for transmitting light emitted from the lamps 51 to the LCD panel. In addition, a reflective sheet 57 is provided under the light guide plate 53 .

[0056] The light emitting lamp 51 is formed of an external electrode fluorescent lamp (EEFL). Each EEFL has two protruding ends corresponding to the first external electrode 55 a and the second external electrode 55 b, wherein th...

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Abstract

A backlight unit and a display device using the same include a light-guiding plate having a plurality of grooves, a plurality of light-emitting lamps in the respective grooves of the light-guiding plate, and a light-diffusion sheet above the light-guiding plate and the lamps.

Description

technical field [0001] The present invention relates to a backlight unit, and more particularly to a backlight unit suitable for a large-sized LCD device and an LCD device using the backlight unit. Background technique [0002] A cathode ray tube (CRT), which is one of flat display devices, has been widely used in displays of televisions, measuring machines and information terminals. However, the CRT cannot meet the requirements for miniaturization and light weight due to its own size and weight. Therefore, various display devices have been developed to replace the CRT, for example, a liquid crystal display (LCD) device utilizing an electric field optical effect, a plasma display panel (PDP) utilizing a gas discharge, and a display device utilizing an electroluminescent effect. Electroluminescence display (ELD) devices. [0003] Among various display devices, LCD devices have been most actively developed, and thus LCD devices having favorable characteristics such as compac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/1333G02B6/00G02B1/04
CPCG02F1/133604G02F1/133606G02F1/1335
Inventor 苏贤珍
Owner LG PHILIPS LCD CO LTD
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