[특허]Lighting apparatus having asymmetric light intensity distribution of compensating for low contrast ratios of LCD panel

[미국특허] Lighting apparatus having asymmetric light intensity distribution of compensating for low contrast ratios of LCD panel 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F21V-033/00
출원번호	US-0205100 (1994-03-03)
우선권정보	JP-0041641 (1993-03-03)
발명자 / 주소	Watanabe Takahiko (Tokyo JPX) Sukegawa Osamu (Tokyo JPX)
출원인 / 주소	NEC Corporation (Tokyo JPX 03)
인용정보	피인용 횟수 : 100 인용 특허 : 0

초록 ▼

A lighting apparatus for illuminating a liquid crystal display (LCD) panel from behind is disclosed, wherein the LCD panel, when illuminated uniformly, exhibits asymmetric contrast ratios as viewed in a vertical direction. The apparatus comprises a light guide panel having a multitude of light reflecting dots on a reflecting surface opposite to the LCD panel, and a light source for injecting light into the light guide panel in a horizontal direction through a first edge of the light guide panel, so that the light propagates through the light guide panel toward the opposite edge of the panel and irregularly reflects off the dots toward the liquid crystal display panel. The light reflecting dots in a lower portion of the reflecting surface have a lower density than those in an upper portion of the reflecting surface, and each of these portions of the reflecting surface has a density increasing as a function of distance from the first edge of the light guide panel so that the LCD panel has equal brightness at the upper and lower portions when viewed at an angle substantially equal to 90°and an angle smaller than 90°, respectively.

대표청구항 ▼

A lighting apparatus for illuminating a liquid crystal display panel from behind, wherein said liquid crystal display panel, when illuminated uniformly, exhibits asymmetric contrast ratios as viewed in a vertical direction, comprising: a light guide panel having a first surface adjacent said liquid crystal display panel, a second surface being opposite to the first surface and remote from said liquid crystal display panel, and a multitude of light reflecting dots arranged on said second surface; and a light source for injecting light into said light guide panel in a horizontal direction through a first edge of the light guide panel, so that the light propagates through said light guide panel toward a second, opposite edge of the panel and irregularly reflects off said dots toward said liquid crystal display panel through the first surface of the light guide panel, wherein the light reflecting dots in a lower portion of the second surface of the light guide panel have a density decreasing as a function of distance from an upper portion of the second surface, and the light reflecting dots in each of said lower and upper portions have a density increasing as a function of distance from said first edge of the light guide panel to said second edge thereof so that said liquid crystal display panel has equal brightness at upper and lower portions thereof when the upper and lower portions of the liquid crystal display panel are viewed respectively at an angle substantially equal to 90°and an angle smaller than 90°.

이 특허를 인용한 특허 (100) 인용/피인용 타임라인 분석

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[미국특허] Lighting apparatus having asymmetric light intensity distribution of compensating for low contrast ratios of LCD panel 원문보기

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[미국특허] Lighting apparatus having asymmetric light intensity distribution of compensating for low contrast ratios of LCD panel 원문보기

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