JP2000081607A - Matrix type liquid crystal display device - Google Patents
Matrix type liquid crystal display deviceInfo
- Publication number
- JP2000081607A JP2000081607A JP10251398A JP25139898A JP2000081607A JP 2000081607 A JP2000081607 A JP 2000081607A JP 10251398 A JP10251398 A JP 10251398A JP 25139898 A JP25139898 A JP 25139898A JP 2000081607 A JP2000081607 A JP 2000081607A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- liquid crystal
- signal
- crystal panel
- electrodes
- 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.)
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Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、反誘電性液晶等の
スメクチック液晶やこのスメクチック液晶に類似した温
度依存性を有する液晶を用いた液晶パネルを採用してな
るマトリクス型液晶表示装置に関する。The present invention relates to a matrix type liquid crystal display device employing a smectic liquid crystal such as an anti-dielectric liquid crystal or a liquid crystal panel using a liquid crystal having a temperature dependency similar to the smectic liquid crystal.
【０００２】[0002]
【従来の技術】従来、この種のマトリクス型液晶表示装
置としては、特開平５−１１９７４６号公報にて示すよ
うに、反強誘電性液晶を用いた液晶パネルを有するもの
がある。ここで、当該液晶パネルは、複数条の走査電
極、複数条の信号電極及び反強誘電性液晶により構成す
る複数のマトリクス状画素を有する。2. Description of the Related Art Conventionally, as this type of matrix type liquid crystal display device, there is a type having a liquid crystal panel using an antiferroelectric liquid crystal as disclosed in Japanese Patent Application Laid-Open No. 5-119746. Here, the liquid crystal panel has a plurality of scanning electrodes, a plurality of signal electrodes, and a plurality of matrix-like pixels formed of antiferroelectric liquid crystals.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記液晶表示
装置において、液晶パネル内の温度は、当該液晶パネル
の表示動作途中にてばらつくため、反強誘電性液晶の応
答特性が、液晶パネル内の反強誘電性液晶の液晶部分の
位置によって異なる。このため、液晶パネルの表示輝度
が当該液晶パネルの表示面内の位置によってばらつくこ
ととなる。このことは液晶パネルの表示に輝度むらを生
ずることを意味する。However, in the above liquid crystal display device, since the temperature in the liquid crystal panel varies during the display operation of the liquid crystal panel, the response characteristics of the antiferroelectric liquid crystal are reduced. It depends on the position of the liquid crystal portion of the antiferroelectric liquid crystal. For this reason, the display luminance of the liquid crystal panel varies depending on the position in the display surface of the liquid crystal panel. This means that the display of the liquid crystal panel has uneven brightness.
【０００４】これに対しては、特公平６−１３１０号公
報や特公平６−１３１１号公報にて示すような液晶表示
装置がある。この液晶表示装置では、温度センサを液晶
パネルに取り付けて、この液晶パネルの温度を温度セン
サにより計測し、この計測温度に基づき反強誘電性液晶
への印加電圧を変化させることで、温度による液晶パネ
ルの全体の輝度変動を補正するようにしている。On the other hand, there is a liquid crystal display device as disclosed in Japanese Patent Publication No. 6-1310 and Japanese Patent Publication No. 6-1311. In this liquid crystal display device, a temperature sensor is attached to a liquid crystal panel, the temperature of the liquid crystal panel is measured by the temperature sensor, and the voltage applied to the antiferroelectric liquid crystal is changed based on the measured temperature, so that the temperature of the liquid crystal is changed. The brightness fluctuation of the entire panel is corrected.
【０００５】しかし、この液晶パネルでは、反強誘電性
液晶全体が同じ温度であると仮定しているため、液晶パ
ネル内の温度むらに起因する輝度むらの発生を解消する
ことができない。これに対しては、第２５０７７１３号
特許公報に示すような液晶表示装置が提案されている。
この液晶表示装置では、液晶パネル内の温度むらを補正
する手段として、液晶パネルの複数箇所の温度を計測す
ることで液晶パネルの複数の領域の温度分布を推定し、
推定した各温度に基づき上記領域毎に走査電圧と信号電
圧の各パルス幅を変更することで、温度むらに起因する
輝度むらの発生を抑制するようにしている。However, in this liquid crystal panel, since it is assumed that the entire antiferroelectric liquid crystal is at the same temperature, it is not possible to eliminate the occurrence of uneven brightness due to uneven temperature in the liquid crystal panel. For this purpose, a liquid crystal display device as disclosed in Japanese Patent No. 2507713 has been proposed.
In this liquid crystal display device, as a means for correcting the temperature unevenness in the liquid crystal panel, the temperature distribution of a plurality of regions of the liquid crystal panel is estimated by measuring the temperature of a plurality of portions of the liquid crystal panel,
By changing the pulse width of the scanning voltage and the pulse width of the signal voltage for each region based on the estimated temperatures, the occurrence of uneven brightness due to uneven temperature is suppressed.
【０００６】しかし、この液晶表示装置では、上記複数
の領域は、液晶パネルの表示面を４分割してなる４領域
にすぎない。このため、上記パルス幅の変更は、当該４
領域の各々に対応してなされ、その結果、温度むらに起
因する輝度補正を大雑把に行うことなる。従って、上記
４領域毎の輝度むら補正よりもさらにきめ細かな輝度む
ら補正を行うことができないという不具合が生ずる。However, in this liquid crystal display device, the plurality of regions are only four regions obtained by dividing the display surface of the liquid crystal panel into four. For this reason, the change of the pulse width
This is performed for each of the regions, and as a result, luminance correction due to uneven temperature is roughly performed. Therefore, there is a problem that the luminance unevenness correction cannot be performed more finely than the luminance unevenness correction for each of the four regions.
【０００７】そこで、本発明は、以上のようなことに対
処するため、マトリクス型液晶表示装置において、その
液晶パネル内の温度むらに基づく輝度むらの発生をきめ
細かく抑制することを目的とする。In view of the above, it is an object of the present invention to provide a matrix type liquid crystal display device in which the occurrence of uneven brightness due to uneven temperature in a liquid crystal panel is finely suppressed.
【０００８】[0008]
【課題を解決するための手段】上記課題の解決にあた
り、請求項１に記載の発明によれば、マトリクス型液晶
表示装置は、複数条の走査電極（Ｙ１乃至Ｙｎ）と、複
数条の信号電極（Ｘ１乃至Ｘｍ）と、これら複数条の走
査電極と複数条の信号電極との間に設けられて当該各複
数条の走査電極及び信号電極と共に複数のマトリクス状
画素（Ｇ１１乃至Ｇｍｎ）を構成する液晶（１０ｃ）と
を備える液晶パネル（１０）と、画像データ信号に基づ
き信号電圧を発生する信号電圧発生手段（１００）と、
複数条の走査電極を走査電圧の印加により駆動制御する
走査電極駆動制御手段（２０、４０）と、複数条の信号
電極を前記信号電圧の印加により駆動制御する信号電極
駆動制御手段（３０、５０）とを備え、走査電極駆動制
御手段及び信号電極駆動制御手段の両駆動制御に応じて
液晶パネルに表示させる。In order to solve the above-mentioned problems, according to the first aspect of the present invention, a matrix type liquid crystal display device comprises a plurality of scanning electrodes (Y1 to Yn) and a plurality of signal electrodes. (X1 to Xm), and the plurality of scanning electrodes and the plurality of signal electrodes are provided between the plurality of scanning electrodes and the plurality of signal electrodes to form a plurality of matrix pixels (G11 to Gmn) together with the plurality of scanning electrodes and the signal electrodes. A liquid crystal panel (10) including a liquid crystal (10c); a signal voltage generating means (100) for generating a signal voltage based on an image data signal;
Scan electrode drive control means (20, 40) for driving and controlling a plurality of scan electrodes by applying a scan voltage, and signal electrode drive control means (30, 50) for drive controlling a plurality of signal electrodes by applying the signal voltage. ), And display is performed on the liquid crystal panel in accordance with both drive control of the scan electrode drive control means and the signal electrode drive control means.
【０００９】そして、当該液晶表示装置は、液晶パネル
の少なくとも一つの位置の温度を検出する温度検出手段
（６０ａ乃至６０ｅ）と、この温度検出手段の検出温度
に基づき液晶パネルの所定画素領域毎の温度を推定する
温度推定手段（２１０）とを備え、信号電圧発生手段
が、温度検出手段の検出温度及び温度推定手段による上
記所定画素領域毎の推定温度に基づき画像データ信号の
実際の強度を上記所定画素領域毎に液晶パネルの所定温
度における目標強度となるように補正する補正手段（８
０、９０、２４０、２５０、３２０、３３０）を具備
し、この補正手段による補正画像データ信号に基づき信
号電圧を発生する。The liquid crystal display device has a temperature detecting means (60a to 60e) for detecting a temperature at at least one position of the liquid crystal panel, and for each predetermined pixel area of the liquid crystal panel based on the temperature detected by the temperature detecting means. Temperature estimating means (210) for estimating a temperature, wherein the signal voltage generating means determines the actual intensity of the image data signal based on the temperature detected by the temperature detecting means and the estimated temperature for each of the predetermined pixel regions by the temperature estimating means. Correction means (8) for correcting the target intensity at a predetermined temperature of the liquid crystal panel for each predetermined pixel area.
0, 90, 240, 250, 320, 330), and generates a signal voltage based on the image data signal corrected by the correction means.
【００１０】このように、補正手段が、温度検出手段の
検出温度及び温度推定手段による上記所定画素領域毎の
推定温度に基づき画像データ信号の実際の強度を上記所
定画素領域毎に液晶パネルの所定温度における目標強度
となるように補正する。このことは、液晶パネルの輝度
が所定画素領域毎にきめ細かく補正されることを意味す
る。As described above, the correcting means determines the actual intensity of the image data signal on the basis of the detected temperature of the temperature detecting means and the estimated temperature of each of the predetermined pixel areas by the temperature estimating means. Correction is made so that the target intensity at the temperature is obtained. This means that the brightness of the liquid crystal panel is finely corrected for each predetermined pixel area.
【００１１】従って、液晶パネルの温度分布にバラツキ
があっても、これに影響されることなく、液晶パネルの
表示面はその全面に亘り上記所定温度における輝度に常
に良好に維持される。その結果、液晶パネルの表示面に
おける温度むらに影響されることなく、液晶パネルの輝
度むらを良好になくすることができる。Therefore, even if there is a variation in the temperature distribution of the liquid crystal panel, the display surface of the liquid crystal panel is always satisfactorily maintained at the predetermined temperature over the entire surface without being affected by the variation. As a result, luminance unevenness of the liquid crystal panel can be favorably eliminated without being affected by temperature unevenness on the display surface of the liquid crystal panel.
【００１２】なお、上記所定画素領域を画素毎とすれ
ば、上記作用効果はより一層きめ細かく達成され得る。
また、請求項２に記載の発明によれば、マトリクス型液
晶表示装置は、複数条の走査電極（Ｙ１乃至Ｙｎ）と、
複数条の信号電極（Ｘ１乃至Ｘｍ）と、これら複数条の
走査電極と複数条の信号電極との間に設けられて当該各
複数条の走査電極及び信号電極と共に複数のマトリクス
状画素（Ｇ１１乃至Ｇｍｎ）を構成する温度依存性の高
い特性の液晶（１０ｃ）とを備える液晶パネル（１０）
と、画像データ信号に基づき信号電圧を発生する信号電
圧発生手段（１００）と、複数条の走査電極を走査電圧
の印加により駆動制御する走査電極駆動制御手段（２
０、４０）と、複数条の信号電極を信号電圧の印加によ
り駆動制御する信号電極駆動制御手段（３０、５０）と
を備え、走査電極駆動制御手段及び信号電極駆動制御手
段の両駆動制御に応じて液晶パネルに表示させる。[0012] If the predetermined pixel region is set for each pixel, the above-described operation and effect can be more finely achieved.
According to the invention described in claim 2, the matrix type liquid crystal display device includes a plurality of scanning electrodes (Y1 to Yn),
A plurality of matrix-shaped pixels (G11 to Xm) are provided between the plurality of signal electrodes (X1 to Xm) and the plurality of scanning electrodes and the plurality of signal electrodes, and together with the plurality of scanning electrodes and the signal electrodes. Gmn) and a liquid crystal panel (10) comprising a liquid crystal (10c) having high temperature-dependent characteristics.
A signal voltage generating means (100) for generating a signal voltage based on an image data signal; and a scan electrode drive control means (2) for driving and controlling a plurality of scan electrodes by applying a scan voltage.
0, 40), and signal electrode drive control means (30, 50) for driving and controlling a plurality of signal electrodes by applying a signal voltage, for controlling both scan electrode drive control means and signal electrode drive control means. It is displayed on the liquid crystal panel accordingly.
【００１３】そして、当該液晶表示装置は、液晶パネル
の少なくとも一つの位置の温度を検出する温度検出手段
（６０ａ乃至６０ｅ）と、この温度検出手段の検出温度
に基づき走査電圧及び信号電圧の各振幅を変更する変更
手段（２３０）と、温度検出手段の検出温度に基づき液
晶パネルの所定画素領域毎の温度を推定する温度推定手
段（２１０）とを備え、走査電極駆動制御手段及び信号
電極駆動制御手段が走査電圧及び信号電圧を変更手段に
よる変更振幅でもって印加し、信号電圧発生手段が、温
度検出手段の検出温度及び温度推定手段による上記所定
画素領域毎の推定温度に基づき画像データ信号の実際の
強度を上記所定画素領域毎に液晶パネルの所定温度にお
ける目標強度となるように補正する補正手段（８０、９
０、２４０、２５０、３２０、３３０）を具備し、この
補正手段による補正画像データ信号に基づき信号電圧を
発生する。The liquid crystal display device has temperature detecting means (60a to 60e) for detecting the temperature of at least one position of the liquid crystal panel, and the amplitudes of the scanning voltage and the signal voltage based on the detected temperatures of the temperature detecting means. (230), and temperature estimating means (210) for estimating the temperature of each predetermined pixel area of the liquid crystal panel based on the temperature detected by the temperature detecting means. The scanning electrode drive control means and the signal electrode drive control Means for applying a scanning voltage and a signal voltage with a changed amplitude by the changing means, and a signal voltage generating means for applying an actual image data signal based on the temperature detected by the temperature detecting means and the estimated temperature for each of the predetermined pixel regions by the temperature estimating means. Correcting means (80, 9) for correcting the intensity of the liquid crystal panel to a target intensity at a predetermined temperature of the liquid crystal panel for each of the predetermined pixel regions.
0, 240, 250, 320, 330), and generates a signal voltage based on the image data signal corrected by the correction means.
【００１４】これによれば、上記変更手段の採用のも
と、補正手段が、温度検出手段の検出温度及び温度推定
手段による上記所定画素領域毎の推定温度に基づき画像
データ信号の実際の強度を上記所定画素領域毎に液晶パ
ネルの所定温度における目標強度となるように補正す
る。これにより、液晶が温度依存性の高いものであって
も、請求項１に記載の発明と同様の作用効果を達成でき
る。According to this, with the adoption of the changing means, the correcting means determines the actual intensity of the image data signal based on the temperature detected by the temperature detecting means and the estimated temperature for each of the predetermined pixel regions by the temperature estimating means. Correction is performed so that the target intensity at a predetermined temperature of the liquid crystal panel is obtained for each of the predetermined pixel regions. Thereby, even if the liquid crystal has a high temperature dependency, the same operation and effect as the first aspect can be achieved.
【００１５】また、請求項３に記載の発明によれば、請
求項１又は２に記載の発明において、補正手段は、画像
データ信号の実際の強度と目標強度との関係を表す直線
式の傾き及び切片を上記所定画素領域毎の推定温度と液
晶パネルの所定温度との温度差に応じてデータとして予
め記憶する第１記憶手段（８０）と、この第１記憶手段
の記憶データに基づき上記所定画素領域毎の推定温度に
応じて上記傾き及び切片を算出して補正データとして記
憶する第２記憶手段（２４０、２５０、９０）とを備え
て、この第２記憶手段の補正データに基づき画像データ
信号の実際の強度を上記所定画素領域毎に目標強度に補
正する。According to a third aspect of the present invention, in the first or second aspect of the present invention, the correcting means comprises a linear gradient representing the relationship between the actual intensity of the image data signal and the target intensity. A first storage unit (80) for storing in advance the data as data in accordance with a temperature difference between the estimated temperature of each of the predetermined pixel regions and the predetermined temperature of the liquid crystal panel; and the predetermined storage unit based on the storage data of the first storage unit. A second storage unit (240, 250, 90) for calculating the inclination and intercept according to the estimated temperature for each pixel region and storing the calculated inclination and intercept as correction data, based on the correction data of the second storage unit. The actual intensity of the signal is corrected to the target intensity for each of the predetermined pixel regions.
【００１６】これにより、請求項１又は２に記載の発明
の作用効果をより一層確実に達成できる。Thus, the operation and effect of the invention described in claim 1 or 2 can be more reliably achieved.
【００１７】[0017]
【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。図１は、本発明に係るマトリクス
型液晶表示装置の一実施形態を示すブロック図である。
当該液晶表示装置は液晶パネル１０を備えており、この
液晶パネル１０は、図２にて示すごとく、両電極基板１
０ａ、１０ｂの間に反強誘電性液晶１０ｃを封入すると
ともに、両電極基板１０ａ、１０ｂの各外表面に各偏光
板１０ｄ、１０ｅを貼り付けて構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a matrix type liquid crystal display device according to the present invention.
The liquid crystal display device includes a liquid crystal panel 10, and the liquid crystal panel 10, as shown in FIG.
An anti-ferroelectric liquid crystal 10c is sealed between Oa and 10b, and polarizers 10d and 10e are attached to outer surfaces of both electrode substrates 10a and 10b.
【００１８】電極基板１０ａは、透明なガラス基板１１
を有しており、このガラス基板１１の内表面には、ｍ条
のカラーフィルタ層１２（Ｒ、Ｇ、Ｂの各層からな
る）、ｍ条の透明電極１３及び配向膜１４が順次形成さ
れている。一方、電極基板１０ｂは、透明なガラス基板
１５を有しており、このガラス基板１５の内表面には、
ｎ条の透明電極１６及び配向膜１７が順次形成されてい
る。The electrode substrate 10a is a transparent glass substrate 11
On the inner surface of the glass substrate 11, m color filter layers 12 (consisting of R, G, and B layers), m transparent electrodes 13, and an alignment film 14 are sequentially formed. I have. On the other hand, the electrode substrate 10b has a transparent glass substrate 15, and the inner surface of the glass substrate 15 has
The n transparent electrodes 16 and the alignment film 17 are sequentially formed.
【００１９】ここで、ｍ条の透明電極１３及びｎ条の透
明電極１６は、反強誘電性液晶１０ｃと共に、図３にて
例示するようなｍ×ｎ個の画素Ｇ１１、Ｇ１２、…、Ｇ
ｍｎを形成するように、互いに交差して配置されてい
る。なお、各カラーフィルタ層１２は各ブラックマスク
層（図示しない）と交互に設けられている。また、ｍ条
の透明電極１３は、図１にて示すｍ条の信号電極Ｘ１乃
至Ｘｍに相当し、一方、ｎ条の透明電極１６は、図１に
て示すｎ条の走査電極Ｙ１乃至Ｙｎに相当する。Here, the m transparent electrodes 13 and the n transparent electrodes 16 are provided together with the antiferroelectric liquid crystal 10c together with m × n pixels G11, G12,.
mn are arranged so as to intersect with each other. Each color filter layer 12 is provided alternately with each black mask layer (not shown). The m transparent electrodes 13 correspond to the m signal electrodes X1 to Xm shown in FIG. 1, while the n transparent electrodes 16 correspond to the n scanning electrodes Y1 to Yn shown in FIG. Is equivalent to
【００２０】なお、両偏光板１０ｄ、１０ｅは、その各
光軸をクロスニコルの位置に設定するように、貼り付け
られている。これにより、反強誘電性液晶１０ｃは、そ
の反強誘電状態にて消光する。なお、両電極基板１０
ａ、１０ｂの間隔は、図示しないスペーサにより、例え
ば、２μｍに均一に保持されている。また、反強誘電性
液晶１０ｃとしては、例えば、特開平５−１１９７４６
号公報に記載されているような４−（１−トリフルオル
メチルヘプトキシカルボルフェニル）−４’−オクチル
オキシカルベニルフェニル−４−カルボキシレートとい
った液晶組成物を用いる。なお、この種の反強誘電性液
晶としては、反強誘電性液晶を複数混合した混合液晶、
或いは少なくとも１種類の反強誘電性液晶を含む混合液
晶を用いてもよい。The two polarizing plates 10d and 10e are attached so that their optical axes are set at the positions of crossed Nicols. Thereby, the antiferroelectric liquid crystal 10c is extinguished in its antiferroelectric state. The two electrode substrates 10
The distance between a and 10b is uniformly maintained at, for example, 2 μm by a spacer (not shown). Examples of the antiferroelectric liquid crystal 10c include, for example, Japanese Patent Application Laid-Open No. 5-119746.
A liquid crystal composition such as 4- (1-trifluoromethylheptoxycarbolphenyl) -4′-octyloxycarbenylphenyl-4-carboxylate as described in Japanese Patent Application Laid-Open Publication No. H10-209,036 is used. In addition, as this kind of antiferroelectric liquid crystal, a mixed liquid crystal in which a plurality of antiferroelectric liquid crystals are mixed,
Alternatively, a mixed liquid crystal containing at least one kind of antiferroelectric liquid crystal may be used.
【００２１】また、液晶表示装置は、走査電極駆動回路
２０及び信号電極駆動回路３０を備えている。走査電極
駆動回路２０は、電源回路４０から書き込み電圧、保持
電圧或いは消去電圧を走査電圧として入力される。そし
て、この走査電極駆動回路２０は、コントロール回路１
００からの同期信号に基づき各走査電極Ｙ１乃至Ｙｎを
線順次走査し、この走査に伴い、走査電極駆動回路２０
からの走査電圧を各走査電極Ｙ１乃至Ｙｎに順次印加す
る。The liquid crystal display device has a scanning electrode driving circuit 20 and a signal electrode driving circuit 30. The scan electrode drive circuit 20 receives a write voltage, a hold voltage or an erase voltage from the power supply circuit 40 as a scan voltage. The scan electrode drive circuit 20 is connected to the control circuit 1
The scanning electrodes Y1 to Yn are line-sequentially scanned based on the synchronization signal from 00, and the scanning electrode driving circuit 20
Are sequentially applied to the scanning electrodes Y1 to Yn.
【００２２】電源回路４０は、後述するマイクロコンピ
ュータ７０により、走査電極駆動回路２０へ付与すべき
各電圧の最大値及び最小値を変更制御されて、このよう
に変更制御した各電圧を走査電圧として走査電極駆動回
路２０に付与する。信号電極駆動回路３０は、上記走査
電圧のうちの書き込み電圧に同期してコントロール回路
１００からの補正画像データ信号（後述する）を電源回
路５０からの各電圧に応じて信号電圧として各信号電極
Ｘ１乃至Ｘｍに印加する。The power supply circuit 40 is controlled to change the maximum value and the minimum value of each voltage to be applied to the scan electrode drive circuit 20 by a microcomputer 70, which will be described later. This is applied to the scan electrode drive circuit 20. The signal electrode driving circuit 30 converts the corrected image data signal (described later) from the control circuit 100 into a signal voltage in accordance with each voltage from the power supply circuit 50 in synchronization with the writing voltage of the scanning voltages. To Xm.
【００２３】電源回路５０は、後述するマイクロコンピ
ュータ７０により、信号電極駆動回路３０へ付与すべき
各電圧の最大値及び最小値を変更制御されて、このよう
に変更制御した各電圧を信号電極駆動回路３０に付与す
る。温度センサ６０ａ乃至６０ｅは、液晶パネル１０の
温度を測定するためのもので、温度センサ６０ａは、液
晶パネル１０の電極基板１０ａの図１にて図示上縁左側
隅角部に設けられて、当該上縁左側隅角部の温度を検出
する。The power supply circuit 50 is controlled to change the maximum value and the minimum value of each voltage to be applied to the signal electrode drive circuit 30 by a microcomputer 70, which will be described later. Applied to the circuit 30. The temperature sensors 60a to 60e are for measuring the temperature of the liquid crystal panel 10. The temperature sensor 60a is provided at the upper left corner of the electrode substrate 10a of the liquid crystal panel 10 in FIG. The temperature at the upper left corner is detected.
【００２４】温度センサ６０ｂは、液晶パネル１０の電
極基板１０ａの図１にて図示上縁右側隅角部に設けられ
て、当該上縁右側隅角部の温度を検出する。温度センサ
６０ｃは、電極基板１０ａの図１にて図示下縁右側隅角
部に設けられて、当該下縁右側隅角部の温度を検出す
る。温度センサ６０ｄは、電極基板１０ａの図１にて図
示下縁左側隅角部に設けられて、当該下縁左側隅角部の
温度を検出する。また、温度センサ６０ｅは、電極基板
１０ａの図１にて図示中央部に設けられて、当該中央部
の温度を検出する。なお、各温度センサ６０ａ乃至６０
ｄは液晶パネル１０の表示領域の外側に位置している。The temperature sensor 60b is provided at the upper right corner of the electrode substrate 10a of the liquid crystal panel 10 shown in FIG. 1, and detects the temperature of the upper right corner. The temperature sensor 60c is provided at the lower right corner of the electrode substrate 10a in FIG. 1 and detects the temperature of the lower right corner. The temperature sensor 60d is provided at the lower left corner of the electrode substrate 10a in FIG. 1 to detect the temperature of the lower left corner. The temperature sensor 60e is provided at the center of the electrode substrate 10a in FIG. 1 and detects the temperature of the center. The temperature sensors 60a to 60a
d is located outside the display area of the liquid crystal panel 10.
【００２５】マイクロコンピュータ７０は、第１コンピ
ュータプログラムを図４にて示すフローチャートに従い
実行し、この実行中において、各温度センサ６０ａ乃至
６０ｅの検出温度及び後述するＲＯＭ８０の記憶データ
に応じて両電源回路４０、５０の駆動に必要な演算処理
及び補正データ（後述する）の書き込みに必要な処理を
する。なお、上記第１コンピュータプログラムは、マイ
クロコンピュータ７０のＲＯＭに予め記憶されている。The microcomputer 70 executes the first computer program in accordance with the flowchart shown in FIG. 4. During this execution, the microcomputer 70 executes the dual power supply circuit in accordance with the temperatures detected by the temperature sensors 60a to 60e and the data stored in the ROM 80 described later. The arithmetic processing necessary for driving the driving units 40 and 50 and the processing necessary for writing correction data (described later) are performed. The first computer program is stored in the ROM of the microcomputer 70 in advance.
【００２６】ＲＯＭ８０には、走査電圧と平均温度（後
述する）との関係を表す走査電圧−温度特性（図６にて
符号Ｐ１参照）及び信号電圧と上記平均温度との関係を
表す信号電圧−温度特性（図６にて符号Ｐ２参照）がデ
ータとして予め記憶されている。また、ＲＯＭ８０に
は、画像データ信号の実際の階調度と目標階調度との関
係を表す直線式（以下、階調度直線式という）の傾きと
温度差（以下、温度差ΔＴという）との関係を表す傾き
−温度差特性（図７にて符号ｑ参照）及び上記階調度直
線式の切片と温度差ΔＴとの関係を表す切片−温度差特
性（図８にて符号Ｑ参照）が予め記憶されている。The ROM 80 has a scanning voltage-temperature characteristic (refer to a symbol P1 in FIG. 6) representing the relationship between the scanning voltage and the average temperature (described later), and a signal voltage representing the relationship between the signal voltage and the average temperature. A temperature characteristic (see reference numeral P2 in FIG. 6) is stored in advance as data. The ROM 80 also stores a relationship between a gradient of a linear equation (hereinafter, referred to as a gradient linear equation) representing a relationship between an actual gradient of an image data signal and a target gradient and a temperature difference (hereinafter, referred to as a temperature difference ΔT). And the intercept-temperature difference characteristic (see reference symbol Q in FIG. 8) indicating the relationship between the intercept of the above-mentioned gradation linear expression and the temperature difference ΔT. Have been.
【００２７】ここで、本実施形態において上述のように
階調度直線式の傾き及び切片、傾き−温度差特性及び切
片−温度差特性を導入した根拠について説明する。画像
データ信号の階調度と液晶パネル１０の表示面の輝度と
の関係を調べたところ、図９にて示すようなデータが得
られた。ここで、液晶パネル１０の温度が上記平均温度
にあるときの階調度と輝度との関係は直線Ｌ１により表
される。また、液晶パネル１０の温度が上記平均温度よ
りも高いときの階調度と輝度との関係は直線Ｌ２により
表される。一方、液晶パネル１０の温度が上記平均温度
よりも低いときの階調度と輝度との関係は直線Ｌ３によ
り表される。Here, the grounds for introducing the gradient and intercept, the gradient-temperature difference characteristic, and the intercept-temperature difference characteristic of the gradient linear expression as described above in this embodiment will be described. When the relationship between the gradation of the image data signal and the luminance of the display surface of the liquid crystal panel 10 was examined, data as shown in FIG. 9 was obtained. Here, the relationship between the gradient and the luminance when the temperature of the liquid crystal panel 10 is at the above average temperature is represented by a straight line L1. The relationship between the gradation and the luminance when the temperature of the liquid crystal panel 10 is higher than the average temperature is represented by a straight line L2. On the other hand, the relationship between the gradient and the luminance when the temperature of the liquid crystal panel 10 is lower than the average temperature is represented by a straight line L3.
【００２８】これによれば、液晶パネル１０の温度が上
記平均温度よりも高いとき液晶パネル１０の表示面の輝
度は全体的に高くなることが分かる。一方、液晶パネル
１０の温度が上記平均温度よりも低いとき液晶パネル１
０の表示面の輝度は全体的に低くなることが分かる。従
って、液晶パネル１０の表示面の輝度を、温度の変化と
はかかわりなく、維持するようにするには、液晶パネル
１０の温度が上記平均温度にあるときの画像データ信号
の実際の階調度と目標階調度との関係を図１０にて示す
直線Ｎにより特定する場合、液晶パネル１０の温度が上
記平均温度よりも高いときの階調度と輝度との関係が図
１０にて示す直線Ｎ１でもって特定され、一方、液晶パ
ネル１０の温度が上記平均温度よりも低いときの階調度
と輝度との関係が図１０にて示す直線Ｎ２でもって特定
されるようにすればよいことが分かる。According to this, when the temperature of the liquid crystal panel 10 is higher than the average temperature, the luminance of the display surface of the liquid crystal panel 10 is generally increased. On the other hand, when the temperature of the liquid crystal panel 10 is lower than the average temperature, the liquid crystal panel 1
It can be seen that the luminance of the display surface of 0 is reduced as a whole. Therefore, in order to maintain the brightness of the display surface of the liquid crystal panel 10 irrespective of the temperature change, the actual gradation of the image data signal when the temperature of the liquid crystal panel 10 is at the above-mentioned average temperature is determined. When the relationship with the target gradient is specified by the straight line N shown in FIG. 10, the relationship between the gradient and the luminance when the temperature of the liquid crystal panel 10 is higher than the average temperature is represented by a straight line N1 shown in FIG. On the other hand, it can be seen that the relationship between the gradation and the luminance when the temperature of the liquid crystal panel 10 is lower than the average temperature may be specified by the straight line N2 shown in FIG.
【００２９】ここで、上記目標階調度とは、画像データ
信号の実際の階調度を、液晶パネル１０の実際の温度と
上記平均温度との間の温度差分だけ相殺するように補正
した値を表す。また、各直線Ｎ、Ｎ１、Ｎ２は、液晶パ
ネル１０の温度をパラメータとする階調度直線式を特定
する。即ち、この階調度直線式によれば、その傾き及び
切片並びに画像データ信号の実際の階調度との関係で、
液晶パネル１０の実際の温度と上記平均温度との間の温
度差ΔＴに応じた画像データ信号の目標階調度を特定で
きることが分かる。Here, the target gradation indicates a value obtained by correcting the actual gradation of the image data signal so as to cancel out the temperature difference between the actual temperature of the liquid crystal panel 10 and the average temperature. . Each of the straight lines N, N1, and N2 specifies a gradient linear expression using the temperature of the liquid crystal panel 10 as a parameter. That is, according to the gradient linear expression, the relationship between the gradient and the intercept and the actual gradient of the image data signal is as follows:
It can be seen that the target gradation of the image data signal can be specified according to the temperature difference ΔT between the actual temperature of the liquid crystal panel 10 and the average temperature.
【００３０】よって、上述した傾き−温度差特性ｑ及び
切片−温度差特性Ｑを予め求めてデータとしてＲＯＭ８
０に記憶してある。ＲＡＭ９０には、一画面分の傾きと
切片がデータとして繰り返し更新記憶されるようになっ
ている。コントロール回路１００は、マイクロコンピュ
ータ１１０を備えており、このマイクロコンピュータ１
１０は、第１コンピュータプログラムを図５にて示すフ
ローチャートに従い実行し、この実行中において、同期
信号（垂直同期信号ＶＳＹＮＣ及び水平同期信号ＨＳＹ
ＮＣ）、画像データ信号及びＲＡＭ９０の記憶データに
基づき信号電極駆動回路３０の駆動に要する画像データ
信号の補正処理を行う。Therefore, the above-described slope-temperature difference characteristic q and intercept-temperature difference characteristic Q are obtained in advance and stored in the ROM 8 as data.
0 is stored. In the RAM 90, the inclination and intercept for one screen are repeatedly updated and stored as data. The control circuit 100 includes a microcomputer 110, and the microcomputer 1
10 executes the first computer program according to the flowchart shown in FIG. 5, and during this execution, the synchronization signals (vertical synchronization signal VSYNC and horizontal synchronization signal HSY) are executed.
NC), a correction process of an image data signal required for driving the signal electrode drive circuit 30 is performed based on the image data signal and the data stored in the RAM 90.
【００３１】このように構成した本実施形態において、
マイクロコンピュータ７０が図４のフローチャートに従
い第１コンピュータプログラムの実行を開始すれば、ス
テップ２００において、各温度センサ６０ａ乃至６０ｅ
の検出温度がディジタル変換されて入力される。する
と、ステップ２１０にて、液晶パネル１０の表示面全体
の温度分布が各温度センサ６０ａ乃至６０ｅの検出温度
に基づき次のようにして推定される。In this embodiment configured as above,
If the microcomputer 70 starts executing the first computer program according to the flowchart of FIG. 4, in step 200, each of the temperature sensors 60a to 60e
Is digitally converted and input. Then, in step 210, the temperature distribution of the entire display surface of the liquid crystal panel 10 is estimated as follows based on the detected temperatures of the temperature sensors 60a to 60e.
【００３２】まず、図１１にて示すごとく、温度センサ
６０ａの配置位置をＸＹ直交座標面の原点（０、０）と
する。ここで、液晶パネル１０の電極基板１０ａの上縁
及び左縁をそれぞれＸ軸及びＹ軸とする。なお、原点
（０、０）は、画素Ｇ１１（図３参照）の位置に対応す
る。これを前提に、温度センサ６０ｂの配置位置を
（Ｘ、Ｙ）＝（Ｘｐ、０）とし、温度センサ６０ｃの配
置位置を（Ｘ、Ｙ）＝（Ｘｐ、Ｙｐ）とし、温度センサ
６０ｄの配置位置を（Ｘ、Ｙ）＝（０、Ｙｐ）とし、温
度センサ６０ｅの配置位置を（Ｘ、Ｙ）＝（Ｘｐ／２、
Ｙｐ／２）とする。First, as shown in FIG. 11, the arrangement position of the temperature sensor 60a is set as the origin (0, 0) on the XY orthogonal coordinate plane. Here, an upper edge and a left edge of the electrode substrate 10a of the liquid crystal panel 10 are defined as an X axis and a Y axis, respectively. Note that the origin (0, 0) corresponds to the position of the pixel G11 (see FIG. 3). Based on this, the position of the temperature sensor 60b is (X, Y) = (Xp, 0), the position of the temperature sensor 60c is (X, Y) = (Xp, Yp), and the position of the temperature sensor 60d is The position is (X, Y) = (0, Yp), and the arrangement position of the temperature sensor 60e is (X, Y) = (Xp / 2,
Yp / 2).
【００３３】ここで、（Ｘ、Ｙ）を液晶パネル１０の表
示面上の任意の位置の座標とする。また、（Ｘｐ、
０）、（Ｘｐ、Ｙｐ）及び（０、Ｙｐ）は、画素Ｇｍ
１、Ｇｍｎ及びＧ１ｎの各位置に対応する。以上のよう
なＸＹ座標系のもと、液晶パネル１０の表示面全体の温
度分布を各温度センサ６０ａ乃至６０ｅの検出温度を用
いて補間方法により推定する。Here, (X, Y) is the coordinates of an arbitrary position on the display surface of the liquid crystal panel 10. Also, (Xp,
0), (Xp, Yp) and (0, Yp) are pixels Gm
1, Gmn and G1n. Based on the XY coordinate system as described above, the temperature distribution of the entire display surface of the liquid crystal panel 10 is estimated by an interpolation method using the detected temperatures of the temperature sensors 60a to 60e.
【００３４】具体的には、各温度センサ６０ａ乃至６０
ｅの検出温度をＴａ乃至Ｔｅで表すものとすると、各座
標（０、０）、（Ｘｐ、０）及び（Ｘｐ／２、Ｙｐ／
２）を結ぶ三角領域１（図１１参照）内の座標（Ｘ、
Ｙ）における温度Ｔ（Ｘ、Ｙ）は、次の数１の式により
与えられる。More specifically, each of the temperature sensors 60a to 60a
Assuming that the detected temperature of e is represented by Ta to Te, the coordinates (0, 0), (Xp, 0) and (Xp / 2, Yp /
2) coordinates (X,
The temperature T (X, Y) in Y) is given by the following equation (1).
【００３５】[0035]
【数１】 また、各座標（０、０）、（０、Ｙｐ）及び（Ｘｐ／
２、Ｙｐ／２）を結ぶ三角領域２（図１１参照）内の座
標（Ｘ、Ｙ）における温度Ｔ（Ｘ、Ｙ）は、次の数２の
式により与えられる。(Equation 1) Also, the coordinates (0, 0), (0, Yp) and (Xp /
The temperature T (X, Y) at the coordinates (X, Y) in the triangular area 2 (see FIG. 11) connecting the (2, Yp / 2) is given by the following equation (2).
【００３６】[0036]
【数２】 また、各座標（Ｘｐ、０）、（Ｘｐ、Ｙｐ）及び（Ｘｐ
／２、Ｙｐ／２）を結ぶ三角領域３（図１１参照）内の
座標（Ｘ、Ｙ）における温度Ｔ（Ｘ、Ｙ）は、次の数３
の式により与えられる。(Equation 2) Also, the coordinates (Xp, 0), (Xp, Yp) and (Xp,
/ 2, Yp / 2), the temperature T (X, Y) at the coordinates (X, Y) in the triangular area 3 (see FIG. 11) is
Given by
【００３７】[0037]
【数３】 また、各座標（Ｘｐ、Ｙｐ）、（０、Ｙｐ）及び（Ｘｐ
／２、Ｙｐ／２）を結ぶ三角形域４（図１１参照）内の
座標（Ｘ、Ｙ）における温度Ｔ（Ｘ、Ｙ）は、次の数４
の式により与えられる。(Equation 3) Also, the coordinates (Xp, Yp), (0, Yp) and (Xp
/ 2, Yp / 2), the temperature T (X, Y) at the coordinates (X, Y) within the triangular area 4 (see FIG. 11) is
Given by
【００３８】[0038]
【数４】 以上述べた数１乃至数４の各式を用いて算出すれば、各
温度センサ６０ａ乃至６０ｅの検出温度に応じて補間法
により各三角領域における温度Ｔ（Ｘ、Ｙ）を推定でき
る。(Equation 4) If the calculation is performed using the above-described equations 1 to 4, the temperature T (X, Y) in each triangular area can be estimated by an interpolation method according to the detected temperatures of the temperature sensors 60a to 60e.
【００３９】このようにして温度分布が推定された後
は、ステップ２２０において、各温度センサ６０ａ乃至
６０ｅの検出温度の加算平均が上記平均温度に相当する
温度平均値Ｔａｖｅとして算出される。ついで、ステッ
プ２３０において、走査電圧及び信号電圧が、図６の走
査電圧−温度特性及び信号電圧−温度特性に基づき上記
平均温度に相当する温度平均値Ｔａｖｅに応じて決定さ
れる。そして、走査電圧が電源回路４０に出力されると
ともに信号電圧が電源回路５０に出力される。After the temperature distribution is estimated in this way, in step 220, the average of the detected temperatures of the temperature sensors 60a to 60e is calculated as a temperature average value Tave corresponding to the average temperature. Next, in step 230, the scanning voltage and the signal voltage are determined according to the temperature average value Tave corresponding to the average temperature based on the scanning voltage-temperature characteristics and the signal voltage-temperature characteristics of FIG. Then, the scanning voltage is output to the power supply circuit 40 and the signal voltage is output to the power supply circuit 50.
【００４０】これに伴い、電源回路４０が走査電圧を複
数の走査電極Ｙ１乃至Ｙｎに出力するとともに、電源回
路５０が信号電圧を複数の信号電圧Ｘ１乃至Ｘｍに出力
する。その後、ステップ２４０において、上記階調度直
線式の傾き及び切片が、傾き−温度差特性ｑ（図７参
照）及び切片−温度差特性Ｑ（図８参照）に基づき液晶
パネル１０の表示面上の各座標位置の温度に応じて一画
面分決定されて、ステップ２５０において、補正データ
としてＲＡＭ９０に記憶される。Accordingly, the power supply circuit 40 outputs the scan voltage to the plurality of scan electrodes Y1 to Yn, and the power supply circuit 50 outputs the signal voltage to the plurality of signal voltages X1 to Xm. Thereafter, in step 240, the slope and intercept of the gradient linear equation are displayed on the display surface of the liquid crystal panel 10 based on the slope-temperature difference characteristic q (see FIG. 7) and the intercept-temperature difference characteristic Q (see FIG. 8). One screen is determined according to the temperature at each coordinate position, and stored in the RAM 90 as correction data in step 250.
【００４１】また、コントロール回路１００において、
マイクロコンピュータ１１０が同期信号に基づき図５の
フローチャートに従い第２コンピュータプログラムの実
行を開始すると、ステップ３００にて画像データ信号が
マイクロコンピュータ１１０に入力され。すると、マイ
クロコンピュータ１１０は、ステップ３１０にて、同期
信号に同期してＲＡＭ９０内の一画面分の補正データを
順次入力される。In the control circuit 100,
When the microcomputer 110 starts executing the second computer program according to the flowchart of FIG. 5 based on the synchronization signal, an image data signal is input to the microcomputer 110 in step 300. Then, in step 310, the microcomputer 110 sequentially inputs correction data for one screen in the RAM 90 in synchronization with the synchronization signal.
【００４２】ここで、当該補正データは、液晶パネル１
０の表示面における各座標（Ｘ、Ｙ）での傾き及び切片
からなる。また、画像データ信号の各階調度０乃至２５
５は、各画素Ｇ１１乃至Ｇｍｎの輝度に対応する。その
後、ステップ３２０において、画像データ信号の目標階
調度が、次の数５の階調度直線式に基づき、上記補正デ
ータに応じて算出される。Here, the correction data is stored in the liquid crystal panel 1
It consists of the slope and intercept at each coordinate (X, Y) on the display surface of 0. Further, each gradation of the image data signal is 0 to 25.
5 corresponds to the luminance of each of the pixels G11 to Gmn. Then, in step 320, the target gradient of the image data signal is calculated according to the above-mentioned correction data based on the following gradient linear equation of Expression 5.
【００４３】[0043]
【数５】ｍxy ＝Ｐｘｙ・Ｍｘｙ ＋ Ｑｘｙ ここで、数５の階調度直線式において、ｍxyは上記目標
階調度を（Ｘ、Ｙ）における値として表し、Ｍｘｙは
（Ｘ、Ｙ）における画像データ信号の実際の階調度を表
す。また、Ｐｘｙは（Ｘ、Ｙ）における傾きを表し、Ｑ
ｘｙは（Ｘ、Ｙ）における切片を表す。M xy = Pxy · Mxy + Qxy Here, in the gradient linear expression of Expression 5, m xy represents the target gradient as a value at (X, Y), and Mxy is a value at (X, Y). Represents the actual gradient of the image data signal. Pxy represents a slope at (X, Y), and Qxy
xy represents the intercept at (X, Y).
【００４４】従って、液晶パネル１０の表示面の一画面
分の各（Ｘ、Ｙ）における目標階調度ｍxyが、各座標
（Ｘ、Ｙ）での傾き及び切片に応じて数５の階調度直線
式に基づき順次算出される。すると、ステップ３３０に
おいて、各（Ｘ、Ｙ）に対応する画像データ信号の階調
度が、上記各目標階調度ｍxyに応じて順次補正される。Accordingly, the target gradation mxy in each (X, Y) of one screen of the display surface of the liquid crystal panel 10 is expressed by the following expression (5) according to the inclination and intercept at each coordinate (X, Y). It is calculated sequentially based on the linear equation. Then, in step 330, the gradient of the image data signal corresponding to each (X, Y) is sequentially corrected according to each of the target gradients mxy .
【００４５】そして、ステップ３４０において、同期信
号が走査電極駆動回路２０に出力されるとともに、目標
階調度ｍxyに補正された画像データ信号が信号電圧とし
て信号電圧駆動回路３０に出力される。以上のような処
理に伴い、走査電極駆動回路２０が、マイクロコンピュ
ータ１１０からの同期信号に基づき各走査電極Ｙ１乃至
Ｙｎを線順次走査し、この線順次走査に応じて電源回路
４０からの走査電圧を線順次走査された走査電極に印加
する。一方、信号電極駆動回路３０が、電源回路５０の
電圧のもと、マイクロコンピュータ１１０からの信号電
圧を信号電極Ｘ１乃至Ｘｍに印加する。Then, in step 340, the synchronizing signal is output to the scan electrode drive circuit 20, and the image data signal corrected to the target gradation mxy is output to the signal voltage drive circuit 30 as a signal voltage. Along with the processing described above, the scan electrode drive circuit 20 scans each of the scan electrodes Y1 to Yn line-sequentially based on a synchronization signal from the microcomputer 110, and according to the line-sequential scan, the scan voltage from the power supply circuit 40. Is applied to the scanning electrodes scanned line-sequentially. On the other hand, the signal electrode drive circuit 30 applies a signal voltage from the microcomputer 110 to the signal electrodes X1 to Xm under the voltage of the power supply circuit 50.
【００４６】これに伴い、液晶パネル１０は、走査電極
駆動回路２０からの走査電圧及び信号電極駆動回路３０
からの信号電圧に応じてマトリクス駆動されて、画像デ
ータ信号の内容を表示する。この場合、画像データ信号
は、その階調度にて、（Ｘ、Ｙ）毎、即ち、画素毎に、
液晶パネル１０の温度分布推定値（（Ｘ、Ｙ）における
推定値）と平均温度値Ｔａｖｅとの差をなくするように
求めた各目標快調度ｍxyとなるように補正される。この
ことは、液晶パネル１０の輝度が画素毎にきめ細かく補
正されることを意味する。Accordingly, the liquid crystal panel 10 is driven by the scan voltage and signal electrode drive circuit 30 from the scan electrode drive circuit 20.
The matrix driving is performed in accordance with the signal voltage from the CPU, and the contents of the image data signal are displayed. In this case, the image data signal has a gradation of (X, Y), that is, for each pixel,
Correction is performed so that each target comfort degree m xy is determined so as to eliminate the difference between the temperature distribution estimated value (estimated value in (X, Y)) of the liquid crystal panel 10 and the average temperature value Tave. This means that the luminance of the liquid crystal panel 10 is finely corrected for each pixel.
【００４７】従って、液晶パネル１０の表示面において
温度分布のバラツキがあっても、これに影響されること
なく、反強誘電性液晶１０ｃは上記平均温度値Ｔａｖｅ
における動作状態に維持され、その結果、液晶パネル１
０の表示面はその全面に亘り上記平均温度値Ｔａｖｅに
おける輝度に常に良好に維持される。その結果、液晶パ
ネル１０の表示面における温度むらに影響されることな
く、液晶パネル１０の輝度むらを良好になくすることが
できる。Therefore, even if there is a variation in the temperature distribution on the display surface of the liquid crystal panel 10, the antiferroelectric liquid crystal 10c is not affected by the variation and the average temperature Tave is not affected.
, And as a result, the liquid crystal panel 1
The display surface of “0” is always satisfactorily maintained at the brightness at the average temperature value Tave over the entire display surface. As a result, luminance unevenness of the liquid crystal panel 10 can be favorably eliminated without being affected by temperature unevenness on the display surface of the liquid crystal panel 10.
【００４８】また、ステップ２３０での処理にて走査電
圧及び信号電圧の各振幅を上述のごとく算出変更してい
るから、反強誘電性液晶１０ｃのように温度依存性の高
い液晶であっても、上記作用効果を良好に達成できる。
なお、本発明の実施にあたり、上記フローチャートに従
いマイクロコンピュータ７０、１１０によりなされる処
理は、アナログ回路やディジタル回路により処理するよ
うにしてもよい。Since the amplitude of the scanning voltage and the amplitude of the signal voltage are calculated and changed in the process of step 230 as described above, even if the liquid crystal has a high temperature dependency like the antiferroelectric liquid crystal 10c. Thus, the above effects can be favorably achieved.
In implementing the present invention, the processing performed by the microcomputers 70 and 110 according to the above flowchart may be performed by an analog circuit or a digital circuit.
【００４９】また、本発明の実施にあたっては、液晶パ
ネル１０の液晶としては、反強誘電性液晶に限らず、強
誘電性液晶等のスメクチック液晶を採用してもよく、ま
た、当該スメクチック液晶と同様に温度依存性の高い液
晶を採用してもよい。また、本発明の実施にあたり、上
記実施形態では上述のごとく配置した５個の温度センサ
６０ａ乃至６０ｅを採用した例について説明したが、こ
れに限ることなく、液晶パネル１０の温度による輝度む
らは当該液晶パネルの背面に設ける回路基板の発熱によ
り生ずることを考慮して、当該回路基板のうち最も発熱
し易い部分に温度センサを配置すれば、より一層精度よ
く液晶パネル１０の表示面の温度分布を推定できる。In practicing the present invention, the liquid crystal of the liquid crystal panel 10 is not limited to an antiferroelectric liquid crystal, but may be a smectic liquid crystal such as a ferroelectric liquid crystal. Similarly, a liquid crystal having high temperature dependency may be employed. In the embodiment of the present invention, an example in which the five temperature sensors 60a to 60e arranged as described above is employed has been described. However, the present invention is not limited to this. In consideration of the heat generated by the circuit board provided on the back surface of the liquid crystal panel, if the temperature sensor is arranged in the portion of the circuit board where heat is most likely to be generated, the temperature distribution on the display surface of the liquid crystal panel 10 can be more accurately determined. Can be estimated.
【００５０】また、本発明の実施にあたり、液晶パネル
１０の定常状態における温度分布を予め測定してＲＯＭ
８０に記憶しておけば、５個の温度センサ６０ａ乃至６
０ｅに代えて、単一の温度センサを採用するだけで、上
記記憶温度分布をもとに液晶パネル１０の表示面におけ
る温度分布を推定できる。また、本発明の実施にあた
り、車両に限ることなく、各種の情報機器や家電機器に
採用されるマトリクス型液晶表示装置であって履歴特性
を有する液晶を用いるものに本発明を適用して実施して
もよい。In implementing the present invention, the temperature distribution in the steady state of the liquid crystal panel 10 is measured in advance and the ROM
80, the five temperature sensors 60a through 60
By employing a single temperature sensor instead of 0e, the temperature distribution on the display surface of the liquid crystal panel 10 can be estimated based on the stored temperature distribution. Further, in practicing the present invention, the present invention is not limited to vehicles, but is applied to a matrix type liquid crystal display device used for various information devices and home electric appliances, which uses a liquid crystal having a hysteresis characteristic, and implements the present invention. You may.
【図１】本発明の一実施形態を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】図１の液晶パネルの模式的断面図である。FIG. 2 is a schematic sectional view of the liquid crystal panel of FIG.
【図３】図１の液晶パネルの走査電極及び信号電極と画
素との関係を示す模式的平面図である。FIG. 3 is a schematic plan view showing a relationship between scanning electrodes and signal electrodes of the liquid crystal panel of FIG. 1 and pixels.
【図４】図１のマイクロコンピュータ７０の作用を示す
フローチャートである。FIG. 4 is a flowchart showing an operation of the microcomputer 70 of FIG.
【図５】図１のマイクロコンピュータ１１０の作用を示
すフローチャートである。FIG. 5 is a flowchart showing an operation of the microcomputer 110 of FIG.
【図６】走査電圧及び信号電圧と平均温度との関係を示
すグラフである。FIG. 6 is a graph showing a relationship between a scanning voltage and a signal voltage and an average temperature.
【図７】階調度直線式の傾きと温度差ΔＴとの関係を示
すグラフである。FIG. 7 is a graph showing a relationship between a gradient of a gradient linear expression and a temperature difference ΔT.
【図８】階調度直線式の切片と温度差ΔＴとの関係を示
すグラフである。FIG. 8 is a graph showing the relationship between the intercept of the gradient linear expression and the temperature difference ΔT.
【図９】液晶パネルの表示面における輝度と画像データ
信号の階調度との関係を温度とパラメータとして示すグ
ラフである。FIG. 9 is a graph showing the relationship between the luminance on the display surface of the liquid crystal panel and the gradient of the image data signal as a temperature and a parameter.
【図１０】画像データ信号の目標階調度と実際の階調度
との関係を温度をパラメータとして示すグラフである。FIG. 10 is a graph showing a relationship between a target gradation of an image data signal and an actual gradation using temperature as a parameter.
【図１１】液晶パネルにおける５個の温度センサの配置
位置を示す平面図である。FIG. 11 is a plan view showing an arrangement position of five temperature sensors in a liquid crystal panel.
１０…液晶パネル、１０ｃ…反強誘電性液晶、２０…走
査電極駆動回路、３０…信号電極駆動回路、４０、５０
…電源回路、６０ａ乃至６０ｅ…温度センサ、７０、１
１０…マイクロコンピュータ、８０…ＲＯＭ、９０…Ｒ
ＯＭ、１００…コントロール回路、Ｘ１乃至Ｘｍ…信号
電極、Ｙ１乃至Ｙｍ…走査電極。DESCRIPTION OF SYMBOLS 10 ... Liquid crystal panel, 10c ... Anti-ferroelectric liquid crystal, 20 ... Scan electrode drive circuit, 30 ... Signal electrode drive circuit, 40, 50
... power supply circuits, 60a to 60e ... temperature sensors, 70, 1
10 microcomputer, 80 ROM, 90 R
OM, 100: control circuit, X1 to Xm: signal electrode, Y1 to Ym: scanning electrode.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松本 直樹 愛知県刈谷市昭和町１丁目１番地 株式会 社デンソー内 Ｆターム(参考） 2H092 GA05 NA01 PA06 PA08 QA14 2H093 NA11 NA43 NA64 NC28 NC50 NC57 NC63 ND02 ND09 ND58 NE06 NF20 5C006 AA16 AA22 AF13 AF46 AF51 AF52 AF53 AF54 AF78 BA13 BB11 BC03 BC12 BF15 BF38 BF43 FA19 FA22 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Naoki Matsumoto 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 2H092 GA05 NA01 PA06 PA08 QA14 2H093 NA11 NA43 NA64 NC28 NC50 NC57 NC63 ND02 ND09 ND58 NE06 NF20 5C006 AA16 AA22 AF13 AF46 AF51 AF52 AF53 AF54 AF78 BA13 BB11 BC03 BC12 BF15 BF38 BF43 FA19 FA22
Claims (3)
複数条の信号電極（Ｘ１乃至Ｘｍ）と、これら複数条の
走査電極と複数条の信号電極との間に設けられて当該各
複数条の走査電極及び信号電極と共に複数のマトリクス
状画素（Ｇ１１乃至Ｇｍｎ）を構成する液晶（１０ｃ）
とを備える液晶パネル（１０）と、 画像データ信号に基づき信号電圧を発生する信号電圧発
生手段（１００）と、 前記複数条の走査電極を走査電圧の印加により駆動制御
する走査電極駆動制御手段（２０、４０）と、 前記複数条の信号電極を前記信号電圧の印加により駆動
制御する信号電極駆動制御手段（３０、５０）とを備
え、 前記走査電極駆動制御手段及び信号電極駆動制御手段の
両駆動制御に応じて前記液晶パネルに表示させるように
したマトリクス型液晶表示装置であって、 前記液晶パネルの少なくとも一つの位置の温度を検出す
る温度検出手段（６０ａ乃至６０ｅ）と、 この温度検出手段の検出温度に基づき前記液晶パネルの
所定画素領域毎の温度を推定する温度推定手段（２１
０）とを備え、 前記信号電圧発生手段が、 前記温度検出手段の検出温度及び前記温度推定手段によ
る前記所定画素領域毎の推定温度に基づき前記画像デー
タ信号の実際の強度を前記所定画素領域毎に前記液晶パ
ネルの所定温度における目標強度となるように補正する
補正手段（８０、９０、２４０、２５０、３２０、３３
０）を具備し、 この補正手段による補正画像データ信号に基づき前記信
号電圧を発生するマトリクス型液晶表示装置。A plurality of scanning electrodes (Y1 to Yn);
A plurality of matrix-shaped pixels (G11 to Xm) are provided between the plurality of signal electrodes (X1 to Xm) and the plurality of scanning electrodes and the plurality of signal electrodes, and together with the plurality of scanning electrodes and the signal electrodes. Gmn) liquid crystal (10c)
A signal voltage generating means (100) for generating a signal voltage based on an image data signal; and a scan electrode drive control means (10) for driving and controlling the plurality of scan electrodes by applying a scan voltage. 20, 40), and signal electrode drive control means (30, 50) for driving and controlling the plurality of signal electrodes by applying the signal voltage, wherein both of the scan electrode drive control means and the signal electrode drive control means are provided. What is claimed is: 1. A matrix type liquid crystal display device adapted to display on said liquid crystal panel according to drive control, comprising: temperature detecting means (60a to 60e) for detecting a temperature at at least one position of said liquid crystal panel; Temperature estimating means (21) for estimating the temperature of each predetermined pixel area of the liquid crystal panel based on the detected temperature of
0), wherein the signal voltage generating means calculates an actual intensity of the image data signal for each of the predetermined pixel areas based on a temperature detected by the temperature detecting means and an estimated temperature for each of the predetermined pixel areas by the temperature estimating means. Correction means (80, 90, 240, 250, 320, 33) for correcting the target intensity of the liquid crystal panel at a predetermined temperature.
0), wherein the signal voltage is generated based on the image data signal corrected by the correction means.
複数条の信号電極（Ｘ１乃至Ｘｍ）と、これら複数条の
走査電極と複数条の信号電極との間に設けられて当該各
複数条の走査電極及び信号電極と共に複数のマトリクス
状画素（Ｇ１１乃至Ｇｍｎ）を構成する温度依存性の高
い特性の液晶（１０ｃ）とを備える液晶パネル（１０）
と、 画像データ信号に基づき信号電圧を発生する信号電圧発
生手段（１００）と、 前記複数条の走査電極を走査電圧の印加により駆動制御
する走査電極駆動制御手段（２０、４０）と、 前記複数条の信号電極を前記信号電圧の印加により駆動
制御する信号電極駆動制御手段（３０、５０）とを備
え、 前記走査電極駆動制御手段及び信号電極駆動制御手段の
両駆動制御に応じて前記液晶パネルに表示させるように
したマトリクス型液晶表示装置であって、 前記液晶パネルの少なくとも一つの位置の温度を検出す
る温度検出手段（６０ａ乃至６０ｅ）と、 この温度検出手段の検出温度に基づき前記走査電圧及び
信号電圧の各振幅を変更する変更手段（２３０）と、 前記温度検出手段の検出温度に基づき前記液晶パネルの
所定画素領域毎の温度を推定する温度推定手段（２１
０）とを備え、 前記走査電極駆動制御手段及び信号電極駆動制御手段が
前記走査電圧及び信号電圧を前記変更手段による変更振
幅でもって印加し、 前記信号電圧発生手段が、 前記温度検出手段の検出温度及び前記温度推定手段によ
る前記所定画素領域毎の推定温度に基づき前記画像デー
タ信号の実際の強度を前記所定画素領域毎に前記液晶パ
ネルの所定温度における目標強度となるように補正する
補正手段（８０、９０、２４０、２５０、３２０、３３
０）を具備し、 この補正手段による補正画像データ信号に基づき前記信
号電圧を発生するマトリクス型液晶表示装置。2. A plurality of scanning electrodes (Y1 to Yn),
A plurality of matrix-shaped pixels (G11 to Xm) are provided between the plurality of signal electrodes (X1 to Xm) and the plurality of scanning electrodes and the plurality of signal electrodes, and together with the plurality of scanning electrodes and the signal electrodes. Gmn) and a liquid crystal panel (10) comprising a liquid crystal (10c) having high temperature-dependent characteristics.
A signal voltage generating means (100) for generating a signal voltage based on an image data signal; a scan electrode drive control means (20, 40) for driving and controlling the plurality of scan electrodes by applying a scan voltage; Signal electrode drive control means (30, 50) for driving and controlling the signal electrodes by applying the signal voltage; and the liquid crystal panel according to both drive control of the scan electrode drive control means and the signal electrode drive control means. A matrix type liquid crystal display device, wherein a temperature detecting means (60a to 60e) for detecting a temperature of at least one position of the liquid crystal panel; and the scanning voltage based on a temperature detected by the temperature detecting means. Changing means (230) for changing each amplitude of the signal voltage; and a temperature for each predetermined pixel area of the liquid crystal panel based on a temperature detected by the temperature detecting means. Temperature estimating means (21)
0), wherein the scan electrode drive control means and the signal electrode drive control means apply the scan voltage and the signal voltage with a change amplitude by the change means, and the signal voltage generation means detects the temperature detection means. Correction means for correcting the actual intensity of the image data signal to a target intensity at a predetermined temperature of the liquid crystal panel for each of the predetermined pixel regions based on a temperature and an estimated temperature for each of the predetermined pixel regions by the temperature estimating unit. 80, 90, 240, 250, 320, 33
0), wherein the signal voltage is generated based on the image data signal corrected by the correction means.
表す直線式の傾き及び切片を前記所定画素領域毎の推定
温度と前記液晶パネルの前記所定温度との温度差に応じ
てデータとして予め記憶する第１記憶手段（８０）と、 この第１記憶手段の記憶データに基づき前記所定画素領
域毎の推定温度に応じて前記傾き及び切片を算出して補
正データとして記憶する第２記憶手段（２４０、２５
０、９０）とを備えて、 この第２記憶手段の補正データに基づき前記画像データ
信号の実際の強度を前記所定画素領域毎に前記目標強度
に補正することを特徴とする請求項１又は２に記載のマ
トリクス型液晶表示装置。3. The liquid crystal panel according to claim 1, wherein the correction unit calculates a slope and an intercept of a linear expression representing a relationship between an actual intensity of the image data signal and a target intensity with the estimated temperature for each of the predetermined pixel regions and the predetermined temperature of the liquid crystal panel. A first storage means (80) for storing in advance as data in accordance with a temperature difference between the first and second pixels, and calculating and correcting the slope and intercept in accordance with the estimated temperature for each of the predetermined pixel regions based on the data stored in the first storage means. Second storage means (240, 25) for storing as data
0, 90), wherein the actual intensity of the image data signal is corrected to the target intensity for each of the predetermined pixel regions based on the correction data in the second storage means. 3. A matrix type liquid crystal display device according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10251398A JP2000081607A (en) | 1998-09-04 | 1998-09-04 | Matrix type liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10251398A JP2000081607A (en) | 1998-09-04 | 1998-09-04 | Matrix type liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000081607A true JP2000081607A (en) | 2000-03-21 |
Family
ID=17222259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10251398A Pending JP2000081607A (en) | 1998-09-04 | 1998-09-04 | Matrix type liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000081607A (en) |
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