JP2010164953A - 液晶表示装置の駆動方法 - Google Patents
液晶表示装置の駆動方法 Download PDFInfo
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Abstract
【解決手段】超解像処理を用いて、解像度を高くする。そして、超解像処理の後、ローカルディミングを用いて、バックライトの輝度を制御して、表示を行う。バックライトの輝度を制御することにより、消費電力を低減することが出来る。また、超解像処理の後で、ローカルディミングを用いることにより、正確に表示を行うことが可能となる。
【選択図】図1
Description
超解像処理とは、解像度の低い画像を元にして、解像度の高い画像を生成する処理のことである。または、超解像処理とは、撮影時または信号転送時などにおいて、失われてしまった情報を復元する処理のことである。したがって、解像度が低いために、細かい部分が潰れて、平均化された画像に超解像処理を行うことにより、細かい部分まで、正確に認識できるような画像を生成することが出来る。そのため、そのような解像度の高い画像を表示した場合、高画質な画像を表示させることが出来る。例えば、小さい石が多数配置されているような公園、または、細かな葉が多数配置されている樹木などにおいて、小さい石の一つ一つや、細かな葉の一つ一つが、超解像処理を行うことによって、正確に識別して見ることが出来る。同様に、ぼやけて読めなかった字が、超解像処理を行うことによって、細かい部分が認識できるようになるため、正確に読めるようにすることが出来る。例えば、超解像処理は、1440×1080の解像度(画素数)の画像から、画像情報を復元することによって、1920×1080の解像度(画素数)の画像を作り出すものである。つまり、画像の情報量を元の画像から増加させつつ解像度変換を行うのが超解像処理技術である、と言うことが可能である。または、超解像処理とは、画像に含まれる情報のうち、入力画像の標本化周波数で決定されるナイキスト周波数よりも高い周波数成分を復元する技術である、と言うことも可能である。
次に、超解像処理技術の例について述べる。超解像処理を行うことにより、解像度の高い画像を表示することが可能となる。
実施の形態1および実施の形態2では、超解像処理と、他の処理、例えば、輪郭強調処理、フレーム補間処理、オーバードライブ処理、ローカルディミング(バックライトの局所輝度制御)処理とを行う場合について示した。ただし、実施の形態の一例は、これらに限定されず、超解像処理及び他の処理の他に、輪郭強調処理、フレーム補間処理、オーバードライブ処理、ローカルディミング(バックライトの局所輝度制御)処理などの処理をさらに行うことも可能である。
次に、処理フローの一部を変形した場合について述べる。したがって、他の実施の形態で述べた内容を適用させることが可能である。
本実施の形態では、照明装置の一例について示す。照明装置は、液晶表示装置のバックライト、または、室内灯などとして用いることが可能である。ただし、実施の形態の一例は、これに限定されない。
次に、表示装置の別の構成例およびその駆動方法について説明する。本実施の形態においては、信号書込みに対する輝度の応答が遅い(応答時間が長い)表示素子を用いた表示装置の場合について述べる。本実施の形態においては、応答時間が長い表示素子として液晶素子を例として説明するが、本実施の形態における表示素子はこれに限定されず、信号書込みに対する輝度の応答が遅い様々な表示素子を用いることができる。
次に、表示装置の別の構成例およびその駆動方法について説明する。本実施の形態においては、表示装置の外部から入力される画像(入力画像)の動きを補間する画像を、複数の入力画像を基にして表示装置の内部で生成し、当該生成された画像(生成画像)と、入力画像とを順次表示させる方法について説明する。なお、生成画像を、入力画像の動きを補間するような画像とすることで、動画の動きを滑らかにすることができ、さらに、ホールド駆動による残像等によって動画の品質が低下する問題を改善できる。ここで、動画の補間について、以下に説明する。動画の表示は、理想的には、個々の画素の輝度をリアルタイムに制御することで実現されるものであるが、画素のリアルタイム個別制御は、制御回路の数が膨大なものとなる問題、配線スペースの問題、および入力画像のデータ量が膨大なものとなる問題等が存在し、実現が困難である。したがって、表示装置による動画の表示は、複数の静止画を一定の周期で順次表示することで、表示が動画に見えるようにして行なわれている。この周期(本実施の形態においては入力画像信号周期と呼び、Tinと表す)は規格化されており、例として、NTSC規格では1/60秒、PAL規格では1/50秒である。この程度の周期でも、インパルス型表示装置であるCRTにおいては動画表示に問題は起こらなかった。しかし、ホールド型表示装置においては、これらの規格に準じた動画をそのまま表示すると、ホールド型であることに起因する残像等により表示が不鮮明となる不具合(ホールドぼけ:hold blur)が発生してしまう。ホールドぼけは、人間の目の追従による無意識的な動きの補間と、ホールド型の表示との不一致(discrepancy)で認識されるものであるので、従来の規格よりも入力画像信号周期を短くする(画素のリアルタイム個別制御に近づける)ことで低減させることができるが、入力画像信号周期を短くすることは規格の変更を伴い、さらに、データ量も増大することになるので、困難である。しかしながら、規格化された入力画像信号を基にして、入力画像の動きを補間するような画像を表示装置内部で生成し、当該生成画像によって入力画像を補間して表示することで、規格の変更またはデータ量の増大なしに、ホールドぼけを低減できる。このように、入力画像信号を基にして表示装置内部で画像信号を生成し、入力画像の動きを補間することを、動画の補間と呼ぶこととする。
本実施の形態においては、液晶表示装置に適用できる画素の構成及び画素の動作について説明する。なお、本実施の形態における液晶素子の動作モードとして、TN(Twisted Nematic)モード、IPS(In−Plane−Switching)モード、FFS(Fringe Field Switching)モード、MVA(Multi−domain Vertical Alignment)モード、PVA(Patterned Vertical Alignment)モード、ASM(Axially Symmetric aligned Micro−cell)モード、OCB(Optically Compensated Birefringence)モード、FLC(Ferroelectric Liquid Crystal)モード、AFLC(AntiFerroelectric Liquid Crystal)などを用いることができる。
本実施の形態では、表示装置の一例について説明する。
本実施の形態では、トランジスタの構造の一例について図18(A)、(B)、及び(C)を参照して説明する。
本実施の形態においては、電子機器の例について説明する。
102 回路
301 領域
302 領域
303 領域
1001 装置
1002 点光源
1003 しきい
1004 しきい
1005 スペーサ
1006 縦方向のピッチ
1007 横方向のピッチ
1011 拡散板
1012 表示パネル
1013 高さ
1014 高さ
1015 間隔
1102 面光源
1103 線光源
1104 導光板
1105 底面
1106 蛍光管(陰極管)
1107 拡散板
5000 筐体
5001 表示部
5002 第2表示部
5003 スピーカ
5004 LEDランプ
5005 操作キー
5006 接続端子
5007 センサ
5008 マイクロフォン
5009 スイッチ
5010 赤外線ポート
5011 記録媒体読込部
5012 支持部
5013 イヤホン
5015 シャッターボタン
5016 受像部
5018 支持台
5019 外部接続ポート
5020 ポインティングデバイス
5021 リーダ/ライタ
5022 筐体
5023 表示部
5024 リモコン装置
5025 スピーカ
5026 表示パネル
5027 ユニットバス
5028 表示パネル
5029 車体
5030 天井
5031 表示パネル
5032 ヒンジ部
5033 光源
5034 投射レンズ
5080 画素
5081 トランジスタ
5082 液晶素子
5083 容量素子
5084 配線
5085 配線
5086 配線
5087 配線
5101 破線
5102 実線
5103 破線
5104 実線
5105 実線
5106 実線
5107 実線
5108 実線
5121 画像
5121a 画像
5121b 画像
5122 画像
5122a 画像
5122b 画像
5123 画像
5123a 画像
5123b 画像
5124 領域
5125 領域
5126 領域
5127 動きベクトル
5128 画像生成用ベクトル
5129 領域
5130 物体
5131 領域
5260 基板
5261 絶縁層
5262 半導体層
5262a 領域
5262b 領域
5262c 領域
5262d 領域
5262e 領域
5263 絶縁層
5264 導電層
5265 絶縁層
5266 導電層
5267 絶縁層
5268 導電層
5269 絶縁層
5270 発光層
5271 導電層
5300 基板
5301 導電層
5302 絶縁層
5303a 半導体層
5303b 半導体層
5304 導電層
5305 絶縁層
5306 導電層
5307 液晶層
5308 導電層
5350 領域
5351 領域
5352 半導体基板
5353 領域
5354 絶縁層
5355 領域
5356 絶縁層
5357 導電層
5358 絶縁層
5359 導電層
5360 映像信号
5361 回路
5361a 回路
5361b 回路
5362 回路
5362a 回路
5362b 回路
5363 回路
5364 画素部
5365 回路
5366 照明装置
5367 画素
5371 配線
5372 配線
5373 配線
5380 基板
5381 入力端子
Claims (4)
- 超解像処理を行う第1のステップと、
ローカルディミング処理を行う第2のステップとを有し、
前記第1のステップの後で、前記第2のステップが行われることを特徴とする液晶表示装置の駆動方法。 - 超解像処理を行う第1のステップと、
ローカルディミング処理を行う第2のステップと、
オーバードライブ処理を行う第3のステップとを有し、
前記第1のステップの後で、前記第2のステップが行われ、
前記第2のステップの後で、前記第3のステップが行われることを特徴とする液晶表示装置の駆動方法。 - 超解像処理を行う第1のステップと、
フレーム補間処理を行う第2のステップと、
ローカルディミング処理を行う第3のステップと、
オーバードライブ処理を行う第4のステップとを有し、
前記第1のステップの後で、前記第2のステップが行われ、
前記第2のステップの後で、前記第3のステップが行われ、
前記第3のステップの後で、前記第4のステップが行われることを特徴とする液晶表示装置の駆動方法。 - 超解像処理を行う第1のステップと、
輪郭強調処理を行う第2のステップと、
ローカルディミング処理を行う第3のステップと、
オーバードライブ処理を行う第4のステップとを有し、
前記第1のステップの後で、前記第2のステップが行われ、
前記第2のステップの後で、前記第3のステップが行われ、
前記第3のステップの後で、前記第4のステップが行われることを特徴とする液晶表示装置の駆動方法。
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JP2010231142A (ja) * | 2009-03-25 | 2010-10-14 | Samsung Electronics Co Ltd | 表示装置及び表示装置の動作方法 |
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