JP6891514B2 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- JP6891514B2 JP6891514B2 JP2017013357A JP2017013357A JP6891514B2 JP 6891514 B2 JP6891514 B2 JP 6891514B2 JP 2017013357 A JP2017013357 A JP 2017013357A JP 2017013357 A JP2017013357 A JP 2017013357A JP 6891514 B2 JP6891514 B2 JP 6891514B2
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- liquid crystal
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- pixel
- display device
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
Description
[1]液晶表示装置の全体構成
図1は、本発明の第1実施形態に係る液晶表示装置10のブロック図である。液晶表示装置10は、表示パネル11、バックライト(照明装置)12、走査ドライバ(走査線駆動回路)13、信号ドライバ(信号線駆動回路)14、共通電極ドライバ(共通電極駆動回路)15、電圧発生回路16、照度センサ17、メモリ部18、及び制御部19を備える。
次に、表示パネル11に含まれる画素の回路構成について説明する。図2は、図1に示した表示パネル11の回路図である。図2では、4つのサブ画素を抽出して示している。
次に、表示パネル11の構成について説明する。本実施形態では、半透過型表示パネルを例に挙げて説明する。半透過型表示パネルは、外光を反射することによって画像を表示する反射領域と、バックライト光を透過することによって画像を表示する透過領域とを1つのサブ画素内に有する。
ゲート電極33、ソース電極36A、接続電極36B、信号線SL、ドレイン電極37A、及び接続電極37Bとしては、例えば、アルミニウム(Al)、モリブデン(Mo)、クロム(Cr)、タングステン(W)のいずれか、又はこれらの1種類以上を含む合金等が用いられる。反射膜40としては、例えばアルミニウム(Al)が用いられる。蓄積電極39、コンタクトプラグ42、画素電極43、及び共通電極47は、透明電極から構成され、例えばITO(インジウム錫酸化物)が用いられる。ゲート絶縁膜34、絶縁膜38、及び絶縁膜41は、透明な絶縁材料から構成され、例えばシリコン窒化物(SiN)が用いられる。
本実施形態では、1つの表示要素(画素)22は、赤色(R)を表示するサブ画素20R、白色(W)を表示するサブ画素20W、緑色(G)を表示するサブ画素20G、及び青色(B)を表示するサブ画素20Bを備える。サブ画素20R、サブ画素20W、サブ画素20G、及びサブ画素20Bはそれぞれ、赤フィルタ46R、白フィルタ46W、緑フィルタ46G、及び青フィルタ46Bによってカラー表示を行う。
次に、上記のように構成された液晶表示装置10の動作について説明する。本実施形態に係る液晶表示装置10は、画素ごとに、赤(R)、緑(G)、及び青(B)の3色階調データを外部装置から受ける。そして、液晶表示装置10は、3色階調データを、赤(R)、緑(G)、青(B)、及び白(W)の4色階調データに変換した後、この4色階調データを用いて映像の表示を行うようにしている。赤(R)、緑(G)、及び青(B)の3色を“RGB”と表記し、赤(R)、緑(G)、青(B)、及び白(W)の4色を“RGBW”と表記する場合がある。以下に、第1及び第2実施例に分けて、液晶表示装置10の動作を説明する。
制御部19は、外部装置から映像信号DATを受ける。映像信号DATには、画素ごとに、赤(R)、緑(G)、及び青(B)の3色(RGB)階調データ(階調値)dR、dG、dBが含まれる。データ変換部19Aは、3色階調データdR、dG、dBを、赤(R)、緑(G)、青(B)、及び白(W)の4色(RGBW)階調データDR、DG、DB、DWに変換する。
DR=dR
DG=dG
DB=dB
DW=[dR・dG・dB/(Z−1)2]
“Z”は、階調数である。括弧“[ ]”は、整数(整数化された値)、すなわち、整数化の演算を意味する。整数化は、小数点以下の値を切り捨てる演算、すなわち、括弧内の値を超えない最大の整数を算出する(例えば、[1.2]=1)。また、整数化は、例えば、小数点以下の値を四捨五入する演算、又は、小数点以下の値を切り上げる演算であってもよい。なお、データ変換用の式やプログラムは、メモリ部18に不揮発に格納される。
第2実施例は、液晶表示装置10の周囲の照度に応じて、映像の明るさを変えるようにしている。換言すると、屋内及び屋外の両方で画面を見た場合に、表示特性を向上させるようにしている。
DR=dR
DG=dG
DB=dB
DW=[−αX2+{1+α(Z−1)}X]
X=dR・dG・dB/(Z−1)2
パラメータαは、“0≦α≦{1/(Z−1)2}”の関係を有する。
以上詳述したように第1実施形態では、液晶表示装置10は、赤、緑、青、及び白をそれぞれ表示可能な4つのサブ画素20R、20G、20B、20Wからなる画素22を備える。サブ画素20R、20G、20B、20Wの各々は、反射領域RA及び透過領域TAを有し、反射領域RAにおける液晶層32の厚さと透過領域TAにおける液晶層32の厚さとが同じである。TFT基板30の反射領域RAには、スイッチング素子21を覆うように反射膜40が設けられる。反射領域RA及び透過領域TA、かつ反射膜40の上方には、絶縁膜41を介して画素電極43が設けられる。サブ画素20R、20G、20B、20Wにそれぞれ対応するようにして、CF基板31には、赤フィルタ46R、緑フィルタ46G、青フィルタ46B、及び白フィルタ46Wが設けられる。TFT基板30の液晶層32と反対側には、位相差板50と、偏光板51とを含む第1積層部材が設けられ、CF基板31の液晶層32と反対側には、位相差板54と、光を拡散する拡散部材55と、偏光板56とを含む第2積層部材が設けられる。
第2実施形態は、反射領域による表示特性を向上させた液晶表示装置の構成例であり、屋外で液晶表示装置を使用した場合に、より表示特性を向上させるようにしている。
Claims (8)
- 第1及び第2基板と、
前記第1及び第2基板間に充填された液晶層と、
赤、緑、青、及び白をそれぞれ表示可能な第1乃至第4サブ画素を備え、前記第1乃至第4サブ画素の各々は、反射領域及び透過領域を有し、前記反射領域における液晶層の厚さと前記透過領域における液晶層の厚さとが同じである、画素と、
前記サブ画素に対応するようにして前記第1基板に設けられたスイッチング素子と、
前記反射領域に設けられ、前記スイッチング素子の上方に絶縁膜を介して設けられた反射膜と、
前記反射領域及び前記透過領域に設けられ、前記反射膜の上方に絶縁膜を介して設けられた画素電極と、
前記第1乃至第4サブ画素にそれぞれ対応するようにして前記第2基板に設けられた赤フィルタ、緑フィルタ、青フィルタ、及び白フィルタと、
前記第1基板の前記液晶層と反対側に設けられ、第1位相差板と、第1偏光板とを含む第1積層部材と、
前記第2基板の前記液晶層と反対側に設けられ、第2位相差板と、光を拡散する拡散部材と、第2偏光板とを含む第2積層部材と
を具備する液晶表示装置。 - 赤、緑、及び青の3色階調データを受け、前記3色階調データを、赤、緑、青、及び白の4色階調データに変換し、前記4色階調データを用いて前記第1乃至第4サブ画素を駆動する制御部をさらに具備し、
前記制御部は、赤、緑、青、シアン、マゼンタ、及びイエローからなる原色を表示する場合に、前記第4サブ画素の階調をゼロにし、白を表示する場合、前記第1乃至第4サブ画素の各々を最大階調にする
請求項1に記載の液晶表示装置。 - 前記制御部は、前記原色の各々の色純度が低くなるにつれて、前記第4サブ画素の階調を大きくする
請求項2に記載の液晶表示装置。 - 周囲環境の照度を測定するセンサをさらに具備し、
前記制御部は、前記照度が大きくなるにつれて、前記第4サブ画素の階調を大きくする
請求項2又は3に記載の液晶表示装置。 - 赤、緑、及び青の3色階調データd R 、d G 、d B を受け、前記3色階調データを、赤、緑、青、及び白の4色階調データD R 、D G 、D B 、D W に変換し、前記4色階調データを用いて前記第1乃至第4サブ画素を駆動する制御部をさらに具備し、
最大階調Zとすると、前記制御部は、以下の演算を実行する
D R =d R
D G =d G
D B =d B
D W =d R ・d G ・d B /(Z−1) 2
請求項1に記載の液晶表示装置。 - 赤、緑、及び青の3色階調データd R 、d G 、d B を受け、前記3色階調データを、赤、緑、青、及び白の4色階調データD R 、D G 、D B 、D W に変換し、前記4色階調データを用いて前記第1乃至第4サブ画素を駆動する制御部をさらに具備し、
最大階調Z、周囲環境の照度のパラメータαとすると、前記制御部は、以下の演算を実行する
D R =d R
D G =d G
D B =d B
D W =−αX 2 +{1+α(Z−1)}X
X=d R ・d G ・d B /(Z−1) 2
0≦α≦{1/(Z−1) 2 }
請求項1に記載の液晶表示装置。 - 前記拡散部材は、前記第2位相差板及び前記第2偏光板の間、又は前記第2基板と前記第2位相差板との間に配置される
請求項1乃至6のいずれかに記載の液晶表示装置。 - 前記液晶層は、垂直配向(VA)モードである
請求項1乃至7のいずれかに記載の液晶表示装置。
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TW107102829A TWI658454B (zh) | 2017-01-27 | 2018-01-26 | 液晶顯示裝置 |
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