JP2005122175A - プラズマディスプレイパネル駆動装置及びその階調表現方法 - Google Patents
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Abstract
【解決手段】まず、各階調別にテスト映像を表示して、シミュレーションによって各列の平均階調値を計算して、各階調を疑似輪郭発生可能性程度によって複数の階調グループに分類する。このような複数の階調グループによって入力階調の変換を相異させて行う。この時、連続して入力される二つのフレームの階調値及びサブフィールドの発光パターンを比較して、疑似輪郭が発生するか否かを検出し、これにより前記階調グループに対応させて階調の変換を相異させて行う。ここで、入力映像信号の疑似輪郭発生可能性程度によって階調を変換するルックアップテーブルを相異させることによって、より一層精密に疑似輪郭の発生を低減させることができる。
【選択図】図1
Description
数1で、in(x、y)は現在のフレームの映像信号データ(x、y)の位置での階調値、in−1(x、y)は直前のフレーム(x、y)の位置での階調値を示す。Bin(p)及びBin−1は各々in(x、y)及びin−1(x、y)に対するp番目のサブフィールドの発光パターン情報を0及び1で示したものである。そして、SP(p)はp番目のサブフィールドの加重値を示し、mはサブフィールドの個数を示す。この時、直前のフレームと現在のフレームとの階調差(in(x、y)−in−1(x、y)の絶対値に該当する値をいう)を数1のように計算したが、これは、疑似輪郭が発生する量が直前のフレームと現在のフレームとの階調差が少ないほど増加するために、前記のように階調差を計算したのである。
前記数3で、P及びQは図4のようなテスト映像の左側、右側の階調を示し、Max_FC及びMin_FCはシミュレーション映像の各列の平均階調の最大値及び最小値を示す。また、max(P、Q)はP、Qのうちの高い値を意味し、min(P、Q)はP、Qのうちの低い値を意味する。つまり、図4乃至図6で示した過程によって得られたシミュレーション結果を前記数3に適用して、源階調P、Qの範囲を逸脱する程度を評価して、疑似輪郭量を決定する。
前記数4で、xは任意の階調を示し、PやQのうちの階調xを有する階調に対してFC(P、Q)を全て足した値で階調xに対する疑似輪郭発生可能性程度を評価する。前記数4によって256階調に対して各階調別の疑似輪郭発生可能性程度を計算すれば、その値によって複数の階調グループに分類される。例えば、3つのグループに分類する時には、下記の数5を満たす条件によって分類する。
前記数5を満たす全階調の階調xを分類して3つの階調グループに分類する。この時、分類される階調グループは必ずしも3つのグループである必要はなく、さらに精密な疑似輪郭発生の低減のために3つ以上のグループに分類することもできる。前記数5で、階調グループ1の場合は疑似輪郭の最大値より小さい場合であるので、全ての階調を満たして256階調となる。階調グループ2の場合は疑似輪郭が非常に大きな階調を除く残りの階調を意味する。階調グループ3の場合は疑似輪郭が少量の階調も除く残りの階調となる。つまり、階調グループ2に比べて階調グループ3が疑似輪郭発生可能性が少ない。そして、階調数では、一般に、階調グループ3が階調グループ2に比べて少ない。
200 アドレス駆動部
300 走査・維持駆動部
400 制御部
Claims (9)
- 入力映像信号に対応してプラズマディスプレイパネルに表示される各フィールドの映像を複数のサブフィールドに分け、前記複数のサブフィールドの組み合わせによって階調を表現して前記映像信号に対応する映像を表示するプラズマディスプレイパネルの駆動装置において、
現在入力されるフレームと直前のフレームとの階調値及びサブフィールドの発光パターンを比較して、疑似輪郭が発生するか否かを検出する疑似輪郭検出部と、
前記疑似輪郭検出部によって検出された入力映像信号の疑似輪郭発生程度の情報によって、予め有している複数の階調グループ別に前記入力映像信号の階調を相異するように変換する階調グループ部と、
前記階調グループ部から出力される映像信号の階調と前記入力映像信号の階調との差を前記階調グループ別に相異するように誤差拡散する誤差拡散部と、
を有することを特徴とする、プラズマディスプレイパネルの駆動装置。 - 前記予め有している階調グループは、各階調テスト映像のシミュレーションによる疑似輪郭発生可能性程度によって複数のグループに分類されることを特徴とする、請求項1に記載のプラズマディスプレイパネルの駆動装置。
- 前記階調グループ部は、前記階調グループ別に階調の変換を相異させて行うためのルックアップテーブルを相異させて有することを特徴とする、請求項2に記載のプラズマディスプレイパネルの駆動装置。
- 前記ルックアップテーブルは、前記シミュレーションによる疑似輪郭発生可能性程度によって階調の変換を行うようにする情報を有することを特徴とする、請求項3に記載のプラズマディスプレイパネルの駆動装置。
- 前記現在入力されるフレームの直前のフレームの映像信号データを保存するフレームメモリ部をさらに有することを特徴とする、請求項1に記載のプラズマディスプレイパネルの駆動装置。
- 入力映像信号に対応してプラズマディスプレイパネルに表示される各フィールドの映像を複数のサブフィールドに分け、前記複数のサブフィールドの組み合わせによって階調を表現して前記映像信号に対応する映像を表示するプラズマディスプレイパネルの階調表現方法において、
(a)現在入力されるフレームと直前のフレームとの階調値及びサブフィールドの発光パターンを比較して、疑似輪郭が発生するか否かを検出する段階と、
(b)前記段階(a)で検出された入力映像信号の疑似輪郭発生程度の情報によって、予め有している複数の階調グループ別に前記入力映像信号の階調を相異するように変換する段階と、
(c)前記段階(b)で出力される映像信号の階調と前記入力映像信号の階調との差を前記階調グループ別に相異するように誤差拡散する段階と、
を有することを特徴とする、プラズマディスプレイパネルの階調表現方法。 - 前記予め有する階調グループは、各階調テスト映像のシミュレーションによる疑似輪郭発生可能性程度によって複数のグループに分類されることを特徴とする、請求項6に記載のプラズマディスプレイパネルの階調表現方法。
- 前記段階(b)での階調グループ別に疑似輪郭の発生を低減させるための階調の変換を行うルックアップ−テーブルを各々有していることを特徴とする、請求項6または請求項7に記載のプラズマディスプレイパネルの階調表現方法。
- 前記段階(c)で誤差拡散されて出力される映像信号データに対応するサブフィールドに変換する段階と、
前記サブフィールドの映像信号データに対応する映像が前記プラズマディスプレイパネルに表示されるように制御する段階と、
をさらに有することを特徴とする、請求項6に記載のプラズマディスプレイパネルの階調表現方法。
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EP1768087A1 (en) * | 2005-09-22 | 2007-03-28 | Deutsche Thomson-Brandt Gmbh | Method and device for recursively encoding luminance values into subfield code words in a display device |
CN100362545C (zh) * | 2005-10-14 | 2008-01-16 | 四川世纪双虹显示器件有限公司 | 用滑动窗口增强pdp综合图像质量的方法 |
KR100681020B1 (ko) * | 2005-11-30 | 2007-02-09 | 엘지전자 주식회사 | 플라즈마 디스플레이 장치 및 플라즈마 디스플레이 장치의구동 방법 |
JP2007316483A (ja) * | 2006-05-29 | 2007-12-06 | Hitachi Ltd | 映像表示装置、映像表示装置用の駆動回路及び映像表示方法 |
KR100818988B1 (ko) * | 2006-09-05 | 2008-04-04 | 삼성전자주식회사 | 영상신호 처리 방법 및 장치 |
CN101325021B (zh) * | 2007-06-15 | 2010-06-09 | 中华映管股份有限公司 | 检测显示器的烧附现象的方法 |
CN101441849B (zh) | 2007-11-23 | 2012-02-29 | 四川虹欧显示器件有限公司 | 降低ac-pdp的图像动态伪轮廓的方法及系统 |
JP5456372B2 (ja) * | 2009-05-29 | 2014-03-26 | グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー | 表示装置 |
JP5762994B2 (ja) * | 2012-02-27 | 2015-08-12 | 株式会社ジャパンディスプレイ | 画像表示装置、画像表示装置の駆動方法および階調変換プログラム、並びに、階調変換装置 |
KR20150019686A (ko) | 2013-08-14 | 2015-02-25 | 삼성디스플레이 주식회사 | 룩업 테이블에 기반한 부분적 의사 윤관 검출 방법 및 그 장치, 그리고 이를 이용한 영상 데이터 보정 방법 |
KR20150096546A (ko) | 2014-02-14 | 2015-08-25 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치의 구동 방법, 및 유기 발광 표시 장치 |
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2003
- 2003-10-16 KR KR1020030072316A patent/KR100589379B1/ko not_active IP Right Cessation
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2004
- 2004-10-13 JP JP2004299046A patent/JP4233511B2/ja not_active Expired - Fee Related
- 2004-10-14 US US10/966,682 patent/US7425936B2/en not_active Expired - Fee Related
- 2004-10-18 CN CNB2004100981615A patent/CN100369090C/zh not_active Expired - Fee Related
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JP2005192190A (ja) * | 2003-12-01 | 2005-07-14 | Pioneer Plasma Display Corp | 動画偽輪郭低減方法、動画偽輪郭低減回路、表示装置及びプログラム |
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US7425936B2 (en) | 2008-09-16 |
CN100369090C (zh) | 2008-02-13 |
JP4233511B2 (ja) | 2009-03-04 |
CN1609933A (zh) | 2005-04-27 |
KR20050036606A (ko) | 2005-04-20 |
US20050083263A1 (en) | 2005-04-21 |
KR100589379B1 (ko) | 2006-06-13 |
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