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Back light unit of display device and liquid crystal display device using it

A technology of liquid crystal display and backlight unit, which is applied in the direction of optical components, static indicators, light guides of lighting systems, etc., and can solve problems such as light leakage and deterioration of display performance of LCD devices

Inactive Publication Date: 2004-07-14
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0075] However, when only the LED lamp 73 corresponding to a specific divided area of ​​the light guide plate 71 is turned on and driven (when driven with DDAMO), leakage of light into adjacent divided areas of the liquid crystal panel and the light guide plate that is not the driving area occurs. light leakage
This light leakage phenomenon deteriorates the display performance of LCD devices

Method used

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  • Back light unit of display device and liquid crystal display device using it
  • Back light unit of display device and liquid crystal display device using it
  • Back light unit of display device and liquid crystal display device using it

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Embodiment Construction

[0114] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0115] As described above, the present invention helps prevent light from leaking into adjacent regions that are not on or off regions in DDAM operation. Each embodiment will be described below.

[0116] According to a first embodiment of the present invention, a backlight unit for a display such as an LCD device includes a main light guide plate, a lampshade configured as a concave surface, and auxiliary light guide plates disposed under both sides of the main light guide plate.

[0117] In the present invention, a display area (for example, a display area corresponding to an LCD device) may be intentionally divided into n areas. As an example, a quarter driving backlight unit in which a light guide plate is divided into 4 regions will be described below.

[0118] Figure 8A is a top plan view of a backlight uni...

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PUM

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Abstract

A backlight unit for a display device and a liquid crystal display device using the backlight unit are proved, wherein the light leakage to a neighboring region is suppressed when a display area is divided and driven by a DDAM (Divided Display Area Method), thereby enhancing the display performance. The backlight unit in one aspect includes a main light guide plate defined by an n number of regions for a field sequential driving, auxiliary light guide plates arranged below edges of the main light guide plate, first and second reflection plates arranged below the main light guide plate and the auxiliary light guide plate, a plurality of light source parts arranged at a predetermined interval at both sides of the auxiliary light guide plate, and a housing configured to enclose a side of the main light guide plate, the auxiliary light guide plate and side and lower portion of the light source parts.

Description

[0001] This patent application claims priority from Korean Patent Application No. P2002-84100 filed on December 26, 2002, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a kind of backlight unit, and the present invention relates more specifically to a kind of backlight unit of the display adopting the DDAM (divided display area method) in the field sequential (FS: Field Sequential) driving method and the liquid crystal display adopting this kind of backlight unit , wherein in the DDAM method, the display area is divided into a plurality of operating areas. Background technique [0003] CRT (cathode ray tube) is a general display, which is mainly used as a monitor for television (TV), measuring machines, information terminals, etc., but because of the size and weight of the CRT itself, it is really not suitable for the miniaturization and portability requirements. [0004] Therefore, the CRT is limited in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00G02B6/00G02F1/13357
CPCG02F2001/133622G02B6/0068G09G3/342G02F1/133615G02B6/0056G02B6/0043G02B6/0031G02B6/0028G02B6/0078G02B6/0076G02F1/133622G02F1/1335
Inventor 俞壮镇禹宗勋
Owner LG DISPLAY CO LTD