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JP2000321571A Expired / Lapsed JP ⏱️ 0.0 years remaining

Liquid crystal display device and backlight brightness adjustment method

Assignee: Sharp NEC Display Solutions Ltd
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Filing: 1999-05-10
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Granted: —
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Expires: 2019-05-10
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Abstract

Abstract Translated from Japanese (57)【要約】 【課題】 画面内に明るい範囲や暗い範囲があった場合 でも、その範囲を見易くなるように輝度調整できる液晶 表示装置と輝度調整方法を提供する。 【解決手段】 アンテナ101で受信された放送波は復 調回路102で復調され映像信号が分割回路103と液 晶表示回路107とに入力される。分割回路103では 入力した映像信号の映像期間を、バックライトの光源1 06の配置に応じて水平方向にm分割、垂直方向にn分 割し、分割された映像信号はAPL(平均輝度)検出回 路104に入力され、映像信号のそれぞれの平均輝度 (APL)を検出して信号処理回路109に出力し、各 領域のAPLの検出結果および各領域のそれぞれの相関 を用いて、APLの高低に応じたゲインの調整を行う演 算を行い、インバータ制御回路105で、それぞれの光 源106のインバータのデューティー比を制御し、光源 106の明るさを調整する。 (57) [Summary] [PROBLEMS] To provide a liquid crystal display device and a luminance adjustment method capable of adjusting the luminance so that even if there is a bright range or a dark range in a screen, the range can be easily seen. A broadcast wave received by an antenna is demodulated by a demodulation circuit, and a video signal is input to a division circuit and a liquid crystal display circuit. The dividing circuit 103 sets the video period of the input video signal to the light source 1 of the backlight. The video signal divided into m in the horizontal direction and n in the vertical direction in accordance with the arrangement of 06 is input to an APL (Average Luminance) detection circuit 104, which detects each average luminance (APL) of the video signal. The signal is output to the signal processing circuit 109 to perform an operation of adjusting the gain according to the level of the APL using the detection result of the APL in each area and the correlation of each area, and the inverter control circuit 105 The brightness ratio of the light source 106 is adjusted by controlling the duty ratio of the inverter of the light source 106.

Inventors

  • 👤 Shuji Murayama
  • 👤 修司 村山

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-11-09 18:00
CPC Classifications
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