[특허]Backlight unit and liquid crystal display unit using backlight unit

[미국특허] Backlight unit and liquid crystal display unit using backlight unit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F21V-007/22 F21V-007/00
출원번호	US-0529545 (2003-09-26)
등록번호	US-7446829 (2008-11-04)
우선권정보	JP-2002-287111(2002-09-30); JP-2002-298943(2002-10-11); JP-2003-136778(2003-05-15)
국제출원번호	PCT/JP03/012387 (2003-09-26)
§371/§102 date	20050329 (20050329)
국제공개번호	WO04/031647 (2004-04-15)
발명자 / 주소	Inoue,Yutaka Ohtsuka,Kohji Idei,Kazuya Shimizu,Masaki Yoshii,Takashi
출원인 / 주소	Sharp Kabushiki Kaisha
대리인 / 주소	Birch, Stewart, Kolasch & Birch, LLP
인용정보	피인용 횟수 : 0 인용 특허 : 20

초록 ▼

To compensate for uneven brightness in the longitudinal direction of fluorescent lamps of a backlight unit and achieve a display screen with an even brightness, a reflection unit of the backlight unit, the fluorescent tube surface of the fluorescent lamps or a diffusion unit is used to either reduce the reflectance, transmittance, or radiation brightness of the high-voltage side of the fluorescent lamps or increase the reflectance, transmittance, or radiation brightness of the low-voltage side thereof so as to compensate for uneven brightness of the illumination light and thereby ensure an even brightness. For example, dot pattern regions D1, D2 and D3, i.e., the regions whose density increases in stages, are imparted to the portion of a reflection layer 13 of the backlight unit with a relatively high brightness. As for the display device, on the other hand, the display image data supplied to a liquid crystal panel or the aperture ratio of the liquid crystal panel is controlled, for example, to compensate for uneven brightness in the longitudinal direction of the fluorescent lamps and ensure an even brightness.

대표청구항 ▼

The invention claimed is: 1. A backlight unit comprising: a plurality of straight tube fluorescent lamps arranged substantially parallel to one another in the longitudinal direction of the fluorescent lamps; driving means arranged on one-end side of the plurality of fluorescent lamps for driving the plurality of fluorescent lamps by applying a high voltage to one-end terminals of the plurality of fluorescent lamps; and a reflection portion adapted to emit the light from the plurality of fluorescent lamps in a specific direction, wherein brightness compensation means are provided for compensating for uneven brightness in the longitudinal direction of the plurality of fluorescent lamps by decreasing the brightness of the fluorescent lamps on one end side or increasing the brightness of the fluorescent lamps on the other end side or controlling brightness in combination from the both end sides, the reflection portion is made up of first and second reflection layers having given optical reflectance and transmittance levels, as the brightness compensation means, the reflection portion is configured with a first region having the first and second reflection layers stacked one above another in the direction of incidence of light and a second region made up only of the first reflection layer, and the reflectance of the reflection portion is controlled using the first region with a relatively high reflectance and the second region with a reflectance lower than that of the first region.

이 특허에 인용된 특허 (20) 인용/피인용 타임라인 분석

Kato Kuniaki (Tokyo JPX) Takahashi Mutsumi (Tokyo JPX), Back-reflection type light diffusing apparatus.
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Akahane Fumiaki (Suwa JPX) Yagasaki Tooru (Suwa JPX) Funamoto Tatsuaki (Suwa JPX), Background lighting apparatus for liquid crystal display.
상세보기
Tomohiro Sasagawa JP; Akimasa Yuuki JP; Naoko Iwasaki JP; Sadayuki Matsumoto JP; Mitsuo Inoue JP; Kyoichiro Oda JP, Backlight for liquid crystal display device.
상세보기
Van Duijneveldt Wido,NLX, Backlight luminaire.
상세보기
Yagyu Mineto,JPX, Driving method for optical apparatus.
상세보기
Murase Shinzo (Ohtsu JPX) Matsui Hirokazu (Ohtsu JPX), Edge light panel.
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Matsumoto Iwao (Toyonaka JPX), Illuminating apparatus and a method of manufacturing an edge light conductor for use therein.
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Kalil Kalantar JP; Tadaaki Nakane JP, Light guide panel and plane illuminator apparatus.
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Ming-dah Liu TW; Shi-chi Hou TW; Gin-wen Hsieh TW; Bor-jyh Pan TW, Light guide plate for a backlight system.
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Koyama, Hiroshi; Takahashi, Tomotsugu, Light reflector.
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Fushimi Yoshimasa (Hirakata JPX) Miyatake Yoshito (Neyagawa JPX), Light valve apparatus, and projection display system and view-finder system employing said light valve apparatus.
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Nagakubo Hideaki,JPX ; Yamazaki Mitsuaki,JPX ; Matsubara Satoshi,JPX ; Kakuta Ryohei,JPX, Liquid crystal display device.
상세보기
Tsubokura, Masaki; Matsumoto, Shinji, Liquid crystal display device.
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Hira Yasuo,JPX ; Taniguchi Hitoshi,JPX ; Mori Yuji,JPX ; Kodera Yoshie,JPX, Liquid crystal display device and method of manufacturing backlighting light guide panel therefor.
상세보기
Mashino Naohiro,JPX ; Hirayama Hisao,JPX, Liquid crystal display device having a side edge type back light system with a hue layer in the vicinity of the light so.
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Itoh, Atsushi; Yoneda, Toshiyuki; Myoi, Yasuhito, Planar light source device and liquid crystal display using the same.
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Yoshikawa Yukio,JPX ; Nakamura Shigekazu,JPX, Surface emission apparatus.
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Yokoyama Kazuaki (Saitama JPX), Surface light source device.
상세보기
Yokoyama Kazuaki (Saitama JPX) Ishikawa Tsuyoshi (Tokyo JPX), Surface light source device.
상세보기
Manabe,Seiji; Fukuda,Kensei; Oomori,Takahiro; Kamizuru,Shinobu; Tate,Sumio; Nakashima,Kazuyuki, Surface lighting device and portable terminal using the same.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Backlight unit and liquid crystal display unit using backlight unit 원문보기