JPS63271497A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS63271497A JPS63271497A JP10745587A JP10745587A JPS63271497A JP S63271497 A JPS63271497 A JP S63271497A JP 10745587 A JP10745587 A JP 10745587A JP 10745587 A JP10745587 A JP 10745587A JP S63271497 A JPS63271497 A JP S63271497A
- Authority
- JP
- Japan
- Prior art keywords
- gamma correction
- liquid crystal
- log
- circuit
- crt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 58
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はＴＶカメラ、ＶＴＲ等の映像信号を液晶パネ
ルに表示するための液晶表示装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device for displaying video signals from a TV camera, VTR, etc. on a liquid crystal panel.
第６図は従来の液晶表示装置を示すブロック図であり、
図において、Ｒ，Ｇ、ＢはそれぞれＴＶカメラ、ＶＴＲ
等から得られる原色映像信号。FIG. 6 is a block diagram showing a conventional liquid crystal display device.
In the figure, R, G, and B are TV cameras and VTRs, respectively.
Primary color video signals obtained from etc.
（ｌａ） 、 （ｌｂ） 、 （ｌｅ）はＡ／Ｄ変換回
路、（２）はメモリ回路、（３）はガンマ補正ＲＯＭ、
（４）は液晶ドライブ回路、（５）は液晶パネル、（６
）は信号線である。(la), (lb), (le) are A/D conversion circuits, (2) are memory circuits, (3) are gamma correction ROM,
(4) is the liquid crystal drive circuit, (5) is the liquid crystal panel, (6
) is a signal line.
Ａ／Ｄ変換回路（ｌａ）、（ｌｂ）、（ｌｃ）およびメ
モリ回路（２）の出力はそれぞれ６ビツト、ガンマ補正
ＲＯＭ （３）の出力は時分割による３２ビツトとなっ
ている。The outputs of the A/D conversion circuits (la), (lb), (lc) and the memory circuit (2) are each 6 bits, and the output of the gamma correction ROM (3) is 32 bits by time division.
上記のように構成された液晶表示装置においては、原色
映像信号Ｒ，Ｇ、ＢはそれぞれＡ／Ｄ変換回路（ｌａ）
Ｉ （ｌｂ） ｔ （ｌｃ）でＡ／Ｄ変換された後メ
モリ回路（２）に入り、各原色映像信号Ｒ，Ｇ、Ｂが時
分割により出力され、 ガンマ補正ＲＯＭ （３）に入
力される。液晶パネル（５）のガンマ特性はＣＲＴのガ
ンマ特性とは異なって、非線形であり、ＮＴＳＣ信号を
そのまま入力するとＣＲＴと同様の階調が得られないた
め、 ガンマ補正Ｒ’ＯＭ（３）において総合ガンマが
１になるように、液晶パネル（５）に合ったガンマ補正
が行われる。ガンマ補正ＲＯＭ （３）の出力は液晶ド
ライブ回路（４）に入力され、信号線（６）を介して液
晶パネル（５）が制御される。In the liquid crystal display device configured as described above, the primary color video signals R, G, and B are each sent to an A/D conversion circuit (la).
After being A/D converted by I (lb) t (lc), it enters the memory circuit (2), where each primary color video signal R, G, B is outputted by time division and input to the gamma correction ROM (3). . The gamma characteristics of the liquid crystal panel (5) are different from those of a CRT and are non-linear, and if you input an NTSC signal as is, you will not be able to obtain the same gradation as a CRT. Therefore, the gamma correction R'OM (3) Gamma correction suitable for the liquid crystal panel (5) is performed so that the gamma becomes 1. The output of the gamma correction ROM (3) is input to a liquid crystal drive circuit (4), and a liquid crystal panel (5) is controlled via a signal line (6).
しかしながら、このような従来の液晶表示装置において
は、Ａ／Ｄ変換回路（ｌａ）−（ｌｂ） −（ｌｃ）に
おける変換は第４図に示すように、物理輝度が等間隔に
なるように行われている。ところが人間の視覚による感
覚輝度はＶｅｂｅｒの法則により、第５図に示すように
１２ｏｇ物理輝度、すなわち物理輝度の対数に比例した
変化を示す。このことは暗い方の変化は小さくても認識
でき、明るい方の変化はかなり大きくないと認識できな
いことを示しており、物理輝度を均等にとると、暗い方
の変化は粗くなり、明るい方の変化は細くなる。However, in such conventional liquid crystal display devices, the conversion in the A/D conversion circuits (la)-(lb)-(lc) is performed so that the physical brightness is at equal intervals, as shown in FIG. It is being said. However, according to Veber's law, the perceived luminance by human vision exhibits a change proportional to the 12og physical luminance, that is, the logarithm of the physical luminance, as shown in FIG. This shows that changes in the dark side can be recognized even if they are small, but changes in the bright side cannot be recognized unless they are quite large.If the physical brightness is taken evenly, the changes in the dark side will be coarser, and the changes in the bright side will not be recognized. The changes become thinner.
従ってＡ／Ｄ変換を例えば６ビツトで行って映像を表示
した場合、感覚上暗い方で変化が粗くなる。これを防ぐ
ためには、Ａ／Ｄ変換の分解能を高くし、例えば６ビツ
トから８ビツトにすることにより、暗い方の変化を細く
することができるが。Therefore, when A/D conversion is performed at, for example, 6 bits and an image is displayed, the changes will be rougher in the darker areas. To prevent this, the resolution of the A/D conversion can be increased, for example from 6 bits to 8 bits, thereby making the changes in the dark side narrower.
この場合、メモリ回路も８ビツトが必要となり、コスト
高になるとともに、明るい方では変化がさらに細くなり
、無駄があるなどの問題点があった。In this case, an 8-bit memory circuit is required, which increases the cost, and there are problems such as the change becomes thinner on the bright side, resulting in waste.
この発明は上記のような問題点を解決するためのもので
、メモリ回路を大形化することなく、暗い方の変化を細
くして１人間の視覚に合った階調制御を行うことができ
、しかも明るい方の変化の無駄をなくすことができる液
晶表示装置を得ることを目的とする。This invention is intended to solve the above-mentioned problems, and it is possible to perform gradation control that matches the visual sense of a single person by narrowing the change in the dark side without increasing the size of the memory circuit. , and moreover, it is an object of the present invention to obtain a liquid crystal display device that can eliminate wasteful changes in brightness.
この発明の液晶表示装置は、原色映像信号をＡ／Ｄ変換
する複数のＡ／Ｄ変換回路と、各Ａ／Ｄ変換回路の出力
をＣＲＴに合ったガンマ補正および逆ｌｏｇ物理輝度に
応じたガンマ補正を行う複数のＣＲＴ・逆ｌｏｇガンマ
補正回路と、各ＣＲＴ・逆ｌｏｇガンマ補正回路の出力
を記憶しかつ時分割により出力するメモリ回路と、この
メモリ回路の出力をｌｏｇ物理輝度に応じたガンマ補正
および液晶パネルに合ったガンマ補正を行うｌｏｇ・液
晶ガンマ補正回路と、このｌｏｇ・液晶ガンマ補正回路
の出力により液晶パネルを制御する液晶ドライブ回路と
を備えたものである。The liquid crystal display device of the present invention includes a plurality of A/D conversion circuits for A/D converting primary color video signals, gamma correction for the output of each A/D conversion circuit, and gamma correction according to inverse log physical brightness. A plurality of CRT/inverse log gamma correction circuits that perform correction, a memory circuit that stores the output of each CRT/inverse log gamma correction circuit and outputs it in a time-sharing manner, and a gamma correction circuit that stores the output of each CRT/inverse log gamma correction circuit and outputs the output in a time-sharing manner. This device includes a log/liquid crystal gamma correction circuit that performs correction and gamma correction suitable for the liquid crystal panel, and a liquid crystal drive circuit that controls the liquid crystal panel based on the output of the log/liquid crystal gamma correction circuit.
この発明の液晶表示装置においては、原色映像信号はＡ
／Ｄ変換回路においてそれぞれＡ／Ｄ変換された後、Ｃ
ＲＴ−ｉ ｌｏｇガンマ補正回路においてＣＲＴに合っ
たガンマ補正および逆ｆｌｏｇ物理輝度に応じたガンマ
補正が行われ、メモリ回路に記憶される。メモリ回路か
ら時分割により出力された信号はｆｌｏｇ・液晶ガンマ
補正回路においてｌｏｇ物理輝度に応じたガンマ補正お
よび液晶パネルに合ったガンマ補正が行われて液晶ドラ
イブ回路に入力され、液晶パネルが制御される。In the liquid crystal display device of this invention, the primary color video signal is A
After being A/D converted in the /D conversion circuit, the C
In the RT-i log gamma correction circuit, gamma correction suitable for the CRT and gamma correction according to the inverse log physical brightness are performed and stored in the memory circuit. The signal output from the memory circuit in a time-division manner is subjected to gamma correction according to the log physical brightness and gamma correction suitable for the liquid crystal panel in the log/liquid crystal gamma correction circuit, and then input to the liquid crystal drive circuit to control the liquid crystal panel. Ru.
この場合、ｌｏｇ・液晶ガンマ補正回路ではｌｏｇ物理
輝度に応じたガンマ補正が行われるため、人間の視覚に
合った階調制御が行われ、また液晶パネルに合ったガン
マ補正が行われるため、ＣＲＴと同様の画像が得られる
。そしてＣＲＴ・逆Ωｏｇガンマ補正回路ではｌｏｇ物
理輝度のガンマ補正と逆の補正が行われるため、Ａ／Ｄ
変換回路の分解能を大きくしても、有効な信号を選択し
てメモリ回路の大形化を防止することができる。In this case, the log/liquid crystal gamma correction circuit performs gamma correction according to the log physical brightness, so gradation control that matches human vision is performed, and gamma correction that matches the liquid crystal panel is performed, so the CRT An image similar to is obtained. And since the CRT/inverse Ωog gamma correction circuit performs the opposite correction to the log physical luminance gamma correction, the A/D
Even if the resolution of the conversion circuit is increased, valid signals can be selected and the memory circuit can be prevented from increasing in size.
〔実施例〕
第１図は実施例の液晶表示装置を示すブロック図であり
、第６図と同一符号は同一または相当部分を示す、Ａ／
Ｄ変換回路（ｌａ） 、 （ｌｂ） ＝ （ｌｃ）とメ
モリ回路（２）の間にはＣＲＴ・逆ｌｏｇガンマ補正回
路としてＣＲＴ−逆ｌｏｇガンマ補正ＲＯＭ （７ａ）
、 （７ｂ）、（７ｃ）が設けられて、各Ａ／Ｄ変換
回路（ｌａ） 、 （ｌｂ） 。[Example] FIG. 1 is a block diagram showing a liquid crystal display device of an example, and the same reference numerals as in FIG. 6 indicate the same or corresponding parts.
Between the D conversion circuit (la), (lb) = (lc) and the memory circuit (2) is a CRT-inverse log gamma correction ROM (7a) as a CRT/inverse log gamma correction circuit.
, (7b) and (7c) are provided, and the A/D conversion circuits (la) and (lb) are respectively provided.
（１ｃ）の出力をＣＲＴに合ったガンマ補正および逆ｌ
ｏｇ物理輝度に応じたガンマ補正を行い、メモリ回路（
２）に入力するようになっている。またメモリ回路（２
）と液晶ドライブ回路（４）の間には（ｌｏｇ・液晶ガ
ンマ補正回路としてｌｏｇ・液晶ガンマ補正ＲＯＭ （
８）が設けられて、メモリ回路（２）の出力をｌｏｇ物
理輝度に応じたガンマ補正および液晶パネル（５）に合
ったガンマ補正を行い、液晶ドライブ回路（４）に入力
するようになっている。Ａ／Ｄ変換回路（ｌａ） 、（
ｌｂ） 、 （ｌｃ）の出力は８ビツト、ＣＲＴ・逆ｌ
ｏｇガンマ補正ＲＯＭ （７ａ）、 （７ｂ）、 （７
ｃ）およびメモリ回路（２）の出力は６ビツト、ｌｏｇ
・液晶ガンマ補正ＲＯＭ （８）の出力は時分割による
３２ビツトになっている。The output of (1c) is gamma corrected and inverted to match the CRT.
Gamma correction is performed according to the og physical brightness, and the memory circuit (
2). Also, the memory circuit (2
) and the liquid crystal drive circuit (4), there is a log/liquid crystal gamma correction ROM (log/liquid crystal gamma correction circuit) (
8) is provided, and the output of the memory circuit (2) is subjected to gamma correction according to log physical luminance and gamma correction suitable for the liquid crystal panel (5), and inputted to the liquid crystal drive circuit (4). There is. A/D conversion circuit (la), (
lb), (lc) output is 8 bits, CRT/inverted l
og gamma correction ROM (7a), (7b), (7
c) and the output of the memory circuit (2) is 6 bits, log
- The output of the liquid crystal gamma correction ROM (8) is 32 bits by time division.
上記構成の液量表示装置においては、原色映像信号Ｒ，
Ｇ、ＢはＡ／Ｄ変換回路（ｌａ） 、 （ｌｂ） 、
（ｌｃ）においてそれぞれＡ／Ｄ変換された後、ＣＲＴ
・逆ｌｏｇガンマ補正ＲＯＭ （７ａ）、 （７ｂ）
、 （７ｃ）においてＣＲＴに合ったガンマ補正および
逆ｌｏｇ物理輝度に応じたガンマ補正が行われ、メモリ
回路（２）に記憶される。メモリ回路（２）から時分割
により出力された信号はｌｏｇ・液晶ガンマ補正ＲＯＭ
（８）において１２ｏｇ物理輝度に応じたガンマ補正
および液晶パネル（５）に合ったガンマ補正が行われて
液晶ドライブ回路（４）に入力され、液晶パネル（５）
が制御される。In the liquid level display device having the above configuration, the primary color video signals R,
G and B are A/D conversion circuits (la), (lb),
After being A/D converted in (lc), CRT
・Reverse log gamma correction ROM (7a), (7b)
, (7c), gamma correction suitable for the CRT and gamma correction according to the inverse log physical luminance are performed and stored in the memory circuit (2). The signal output from the memory circuit (2) in a time-division manner is a log/liquid crystal gamma correction ROM.
At (8), gamma correction according to the 12og physical brightness and gamma correction suitable for the liquid crystal panel (5) are performed and input to the liquid crystal drive circuit (4).
is controlled.
この場合、ｌｏｇ・液晶ガンマ補正ＲＯＭ （８）では
、ｌｏｇ物理輝度に応じたガンマ補正が行われるため、
人間の視覚に合った階調制御が行われる。すなわち人間
の感覚輝度はｎｏｇ物理輝度に比例するから、第３図の
ように感覚輝度を均等化する階調制御を行うために、第
２図に示すようにＱｏｌ＜物理輝度に応じたガンマ補正
が行われ、これによって液晶ドライブ回路（４）では感
覚輝度を均等化する制御が行われる。またｌｏｇ・液晶
ガンマ補正ＲＯＭ （８）では、液晶パネル（５）に合
ったガンマ補正が行われるため、ＣＲＴと同様の画像が
得られる。In this case, the log/liquid crystal gamma correction ROM (8) performs gamma correction according to the log physical brightness, so
Gradation control is performed to suit human vision. In other words, human perceived brightness is proportional to nog physical brightness, so in order to perform gradation control to equalize perceived brightness as shown in Figure 3, Qol < gamma correction according to physical brightness as shown in Figure 2. As a result, the liquid crystal drive circuit (4) performs control to equalize the perceived brightness. Further, the log/liquid crystal gamma correction ROM (8) performs gamma correction suitable for the liquid crystal panel (5), so that an image similar to that of a CRT can be obtained.
このようにρｏｇ・液晶ガンマ補正ＲＯＭ （８）では
感覚輝度に応じたガンマ補正が行われるため、Ａ／Ｄ変
換回路（ｌａ） 、 （ｌｂ） ＝ （ｌｃ）から得ら
れる信号を予めＣＲＴに合った特性にしておく必要があ
り、ＣＲＴ−逆ｌｏｇガンマ補正ＲＯＭ （７ａ） 、
（７ｂ） 、 （７ｃ）においてＣＲＴに合ったガン
マ補正が行われる。In this way, the ρog/liquid crystal gamma correction ROM (8) performs gamma correction according to perceived brightness, so the signals obtained from the A/D conversion circuits (la), (lb) = (lc) are adjusted in advance to the CRT. CRT-inverse log gamma correction ROM (7a),
In (7b) and (7c), gamma correction suitable for CRT is performed.
また総合ガンマ特性を従来と同様に１になるようにする
ために、ＣＲＴ・逆ｆｌｏｇガンマ補正ＲＯＭ（７ａ）
、 （７ｂ） ＝ （７ｃ）において（ｌｏｇ物理輝度
のガンマ補正と逆の補正が行われる。すなわちここで行
われる逆Ｄｏｇ物理輝度に応じたガンマ補正は、ｌｏｇ
・液晶ガンマ補正ＲＯＭ （８）でｌｏｇ物理輝度に応
じたガンマ補正を行ったときに総合ガンマ補正が１にな
るようなガンマ補正である。In addition, in order to make the overall gamma characteristic equal to 1 as before, a CRT/inverse log gamma correction ROM (7a) is installed.
, (7b) = (7c), a correction opposite to the gamma correction of log physical brightness is performed. In other words, the gamma correction according to the inverse Dog physical brightness performed here is
- Liquid crystal gamma correction ROM (8) Gamma correction is such that the total gamma correction becomes 1 when gamma correction is performed according to the log physical brightness.
この場合、Ａ／Ｄ変換回路（ｌａ） ＝ （ｌｂ） 、
（ｌｃ）では８ビツトの出力があり、従来より分解能
が上がって、信号量が多くなっているが、この信号をす
べてサンプリングすると８ビツトの信号となってメモリ
回路（２）を大形化する必要があるので、感覚輝度によ
る制御に有効な信号のみを選択して補正を行う、すなわ
ち第２図に示すように、暗い方（輝度の小さい方）の信
号を多くサンプリングし、明るい方（ｊＩ１１度の大き
い方）の信号を少なくサンプリングすることにより、感
覚輝度に応じた階調制御に必要な信号を選択してガンマ
補正を行い、全体として従来と同様の６ビツトとして出
力する。In this case, A/D conversion circuit (la) = (lb),
(LC) has an 8-bit output, which has higher resolution and a larger signal amount than before, but if all of this signal is sampled, it will become an 8-bit signal, making the memory circuit (2) larger. Therefore, correction is performed by selecting only the signals that are effective for control based on sensory brightness. In other words, as shown in Figure 2, a large number of the darker signals (lower brightness) are sampled, and the brighter signals (jI11 By sampling a smaller number of signals (the one with the highest intensity), the signals necessary for gradation control according to perceived luminance are selected, gamma correction is performed, and the entire signal is output as 6 bits as in the conventional method.
このようにＣＲＴ・逆ρｏｇガンマ補正ＲＯＭ（７ａ）
。In this way, CRT/reverse ρog gamma correction ROM (7a)
.
（７ｂ） 、 （７ｃ）ではｌｏｇ物理輝度のガンマ補
正と逆の補正が行われるため、Ａ／Ｄ変換回路（２ａ）
、 （ｌｂ） 。In (7b) and (7c), since the gamma correction of log physical brightness and the opposite correction are performed, the A/D conversion circuit (2a)
, (lb).
（１ｃ）の分解能を大きくしても、有効な信号のみを選
択してメモリ回路（２）の大形化を防止することができ
る。Even if the resolution of (1c) is increased, only valid signals can be selected and the memory circuit (2) can be prevented from increasing in size.
こうしてｌｏｇ・液晶ガンマ補正ＲＯＭ （８）におい
て感覚輝度に応じたガンマ補正および液晶パネル（５）
に合ったガンマ補正が行われて、総合ガンマ特性は従来
と同様の１になり、これにより感ｉｍ度に応じた階調制
御が行われ、かつＣＲＴと同等の画像が得られる。In this way, the log/liquid crystal gamma correction ROM (8) performs gamma correction according to the perceived brightness and the liquid crystal panel (5)
Gamma correction is performed in accordance with the image quality, and the overall gamma characteristic is set to 1, which is the same as in the past.Thus, gradation control is performed in accordance with the sensitivity, and an image equivalent to that of a CRT is obtained.
なお、以上の説明において、ＣＲＴ・逆ｌｏｇガンマ補
正回路およびｌｏｇ・液晶ガンマ補正回路としては、任
意の回路構成とすることができる。In the above description, the CRT/inverse log gamma correction circuit and the log/liquid crystal gamma correction circuit may have any circuit configuration.
本発明によれば、ＣＲＴ・逆Ωｏｇガンマ補正回路およ
びΩｏｇ・液晶ガンマ補正回路を設けたので。According to the present invention, a CRT/inverse Ωog gamma correction circuit and an Ωog/liquid crystal gamma correction circuit are provided.
メモリ回路を大形化することなく、暗い方の変化を細く
して、人間の視覚に合った階調制御を行うことができ、
しかも明るい方の変化の無駄をなくすことができる。Without increasing the size of the memory circuit, it is possible to narrow the change in the dark side and perform gradation control that matches human vision.
Moreover, it is possible to eliminate unnecessary changes in the bright side.
第１図は実施例のブロック図、第２図および第３図は実
施例の特性を示すグラフ、第４図および第５図は従来の
特性を示すグラフ、第６図は従来装置のブロック図であ
る。
各図中、同一符号は同一または相当部分を示し、（ｌａ
） 、 （ｌｂ） 、 （ｌｃ）はＡ／Ｄ変換回路、（
２）はメモリ回路、（４）は液晶ドライブ回路、（５）
は液晶パネル、（７ａ） 、 （７ｂ） 、 （７ｃ）
はＣＲＴ−逆ｌｏｇガンマ補正ＲＯＭ、（８）はｌｏｇ
・液晶ガンマ補正ＲＯＭである。Fig. 1 is a block diagram of the embodiment, Figs. 2 and 3 are graphs showing the characteristics of the embodiment, Figs. 4 and 5 are graphs showing the conventional characteristics, and Fig. 6 is a block diagram of the conventional device. It is. In each figure, the same reference numerals indicate the same or corresponding parts, (la
), (lb), (lc) are A/D conversion circuits, (
2) is a memory circuit, (4) is a liquid crystal drive circuit, (5)
are liquid crystal panels, (7a), (7b), (7c)
is CRT-inverse log gamma correction ROM, (8) is log
-Liquid crystal gamma correction ROM.
Claims (2)
回路と、各Ａ／Ｄ変換回路の出力をＣＲＴに合ったガン
マ補正および逆ｌｏｇ物理輝度に応じたガンマ補正を行
う複数のＣＲＴ・逆ｌｏｇガンマ補正回路と、各ＣＲＴ
・逆ｌｏｇガンマ補正回路の出力を記憶しかつ時分割に
より出力するメモリ回路と、このメモリ回路の出力をｌ
ｏｇ物理輝度に応じたガンマ補正および液晶パネルに合
ったガンマ補正を行うｌｏｇ・液晶ガンマ補正回路と、
このｌｏｇ・液晶ガンマ補正回路の出力により液晶パネ
ルを制御する液晶ドライブ回路とを備えたことを特徴と
する液晶表示装置。(1) A plurality of A/D conversion circuits that A/D convert the primary color video signal, and a plurality of A/D conversion circuits that perform gamma correction of the output of each A/D conversion circuit according to the CRT and inverse log physical brightness. CRT/inverse log gamma correction circuit and each CRT
・A memory circuit that stores the output of the inverse log gamma correction circuit and outputs it by time division;
A log/liquid crystal gamma correction circuit that performs gamma correction according to og physical brightness and gamma correction suitable for the liquid crystal panel;
A liquid crystal display device comprising a liquid crystal drive circuit that controls a liquid crystal panel using the output of the log/liquid crystal gamma correction circuit.
液晶ガンマ補正回路がＣＲＴ・逆ｌｏｇガンマ補正ＲＯ
Ｍおよびｌｏｇ・液晶ガンマ補正ＲＯＭであることを特
徴とする特許請求の範囲第１項記載の液晶表示装置。(2) CRT/inverse log gamma correction circuit and log/
LCD gamma correction circuit is CRT/reverse log gamma correction RO
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is an M and log liquid crystal gamma correction ROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62107455A JPH0652469B2 (en) | 1987-04-30 | 1987-04-30 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62107455A JPH0652469B2 (en) | 1987-04-30 | 1987-04-30 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63271497A true JPS63271497A (en) | 1988-11-09 |
| JPH0652469B2 JPH0652469B2 (en) | 1994-07-06 |
Family
ID=14459601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62107455A Expired - Lifetime JPH0652469B2 (en) | 1987-04-30 | 1987-04-30 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652469B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6587088B2 (en) | 1992-02-26 | 2003-07-01 | Hitachi, Ltd. | Multiple-tone display system |
| US7212181B1 (en) | 1989-03-20 | 2007-05-01 | Hitachi, Ltd. | Multi-tone display device |
| JP2011133877A (en) * | 2009-11-27 | 2011-07-07 | Canon Inc | Image display device, and image processing device |
| US9235067B2 (en) | 2006-06-02 | 2016-01-12 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006213036A (en) | 2005-02-07 | 2006-08-17 | Fuji Photo Film Co Ltd | Printer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53148919A (en) * | 1977-06-01 | 1978-12-26 | Hitachi Ltd | Matrix display unit |
| JPS57188182A (en) * | 1981-05-14 | 1982-11-19 | Seiko Epson Corp | Gamma compensation circut for liquid crystal video display |
-
1987
- 1987-04-30 JP JP62107455A patent/JPH0652469B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53148919A (en) * | 1977-06-01 | 1978-12-26 | Hitachi Ltd | Matrix display unit |
| JPS57188182A (en) * | 1981-05-14 | 1982-11-19 | Seiko Epson Corp | Gamma compensation circut for liquid crystal video display |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7212181B1 (en) | 1989-03-20 | 2007-05-01 | Hitachi, Ltd. | Multi-tone display device |
| US7262755B2 (en) | 1989-03-20 | 2007-08-28 | Hitachi, Ltd. | Multi-tone display device |
| US6587088B2 (en) | 1992-02-26 | 2003-07-01 | Hitachi, Ltd. | Multiple-tone display system |
| US6888525B2 (en) | 1992-02-26 | 2005-05-03 | Hitachi, Ltd. | Multiple-tone display system |
| US7106289B2 (en) | 1992-02-26 | 2006-09-12 | Hitachi, Ltd. | Multiple-tone display system |
| US9235067B2 (en) | 2006-06-02 | 2016-01-12 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
| US10013923B2 (en) | 2006-06-02 | 2018-07-03 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
| US10714024B2 (en) | 2006-06-02 | 2020-07-14 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
| US11600236B2 (en) | 2006-06-02 | 2023-03-07 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
| US11657770B2 (en) | 2006-06-02 | 2023-05-23 | Semiconductor Energy Laboratory Co., Ltd. | Display device and driving method thereof |
| JP2011133877A (en) * | 2009-11-27 | 2011-07-07 | Canon Inc | Image display device, and image processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0652469B2 (en) | 1994-07-06 |
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