JPH08201812A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH08201812A JPH08201812A JP7031699A JP3169995A JPH08201812A JP H08201812 A JPH08201812 A JP H08201812A JP 7031699 A JP7031699 A JP 7031699A JP 3169995 A JP3169995 A JP 3169995A JP H08201812 A JPH08201812 A JP H08201812A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- backlight
- controller
- video signal
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置、特に、
ビデオ信号を安定に表示できる液晶表示装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a liquid crystal display device, and more particularly to
The present invention relates to a liquid crystal display device capable of stably displaying a video signal.
【０００２】[0002]
【従来の技術】液晶表示装置は、テレビジョン受像器や
コンピュータ表示装置などに使用されており、表示制御
器が、液晶表示器の各画素の液晶分子集団や配向をビデ
オ信号に応じて制御して、液晶表示器のスクリーンに画
像を表示している。なお、液晶表示器としては、ねじれ
ネマティック型やゲスト・ホスト型などが知られてい
る。また、液晶表示器に表示された画像を見やすくする
ために、この液晶表示器を背面から照明するバックライ
トを設ける。一般的には、操作者が、表示制御器の可変
調整器により液晶表示器の画像のコントラストを調整
し、バックライト制御器の可変調整器によりバックライ
トの輝度を調整して、液晶表示器の画像を見やすい状態
に維持している。2. Description of the Related Art Liquid crystal display devices are used in television receivers, computer display devices, etc., and a display controller controls the liquid crystal molecule group and orientation of each pixel of the liquid crystal display device according to a video signal. Then, the image is displayed on the screen of the liquid crystal display. As the liquid crystal display, a twisted nematic type, a guest-host type, etc. are known. Further, in order to make the image displayed on the liquid crystal display easier to see, a backlight is provided to illuminate the liquid crystal display from the back. Generally, the operator adjusts the contrast of the image on the liquid crystal display with the variable adjuster of the display controller, and the brightness of the backlight with the variable adjuster of the backlight controller. The image is kept easy to see.
【０００３】[0003]
【発明が解決しようとする課題】ところで、液晶表示装
置をテレビジョン受像器に用いた場合、種々の番組を操
作者の好みに応じて受信する。各番組のビデオ信号は、
その平均レベルがビデオ画像の内容により異なる。例え
ば、太陽の下の海の画像の場合には、ビデオ信号の平均
レベルが高くなり、夜景の場合には、ビデオ信号の平均
レベルが低くなる。よって、液晶表示器に表示される画
像もそれに応じて変化し、ビデオ信号の平均レベルが高
くなると表示画面全体が明るくなり、ビデオ信号の平均
レベルが低くなると表示画面全体も暗くなってしまう。
よって、ビデオ信号の平均レベルに応じて表示画面全体
の輝度が暗くなり過ぎたり、明るくなり過ぎたりして、
表示画像が見にくくなる。When the liquid crystal display device is used in a television receiver, various programs are received according to the operator's preference. The video signal of each program is
The average level depends on the content of the video image. For example, in the case of an image of the sea under the sun, the average level of the video signal is high, and in the case of a night view, the average level of the video signal is low. Therefore, the image displayed on the liquid crystal display changes accordingly, and when the average level of the video signal becomes high, the entire display screen becomes bright, and when the average level of the video signal becomes low, the entire display screen also becomes dark.
Therefore, the brightness of the entire display screen becomes too dark or too bright depending on the average level of the video signal,
The displayed image becomes difficult to see.
【０００４】バックライトは、発光効率などから蛍光ラ
ンプが主に利用されており、放電で発生する水銀の紫外
線が蛍光体を励起して可視光を発生している。バックラ
イトは、狭いスペースに封じ込めて使用するので、使用
時間の経過に伴って、照光面の温度が上昇しがちであ
り、室温に対して２０度以上も高くなることがある。と
ころで、蛍光ランプは、周囲温度に対して輝度変化が大
きく、低温時には輝度が低いが、高温時には輝度が高く
なる。また、液晶表示器の液晶自体の特性も温度に依存
し、液晶がバックライトの近傍に配置されるために、コ
ントラストなどの液晶特性がバックライトの温度上昇に
影響される。よって、液晶表示装置の駆動開始時に、バ
ックライトの輝度や液晶表示器のコントラストを最適に
設定していても、使用時間の経過に伴ってバックライト
の温度が上昇し、これら輝度やコントラストが最適輝度
からずれてしまう。As a backlight, a fluorescent lamp is mainly used because of its luminous efficiency and the like, and ultraviolet rays of mercury generated by discharge excite a phosphor to generate visible light. Since the backlight is used by being enclosed in a narrow space, the temperature of the illuminating surface tends to rise with the lapse of usage time, and may rise to 20 degrees or more with respect to room temperature. By the way, a fluorescent lamp has a large brightness change with respect to the ambient temperature, and has a low brightness at a low temperature, but has a high brightness at a high temperature. Further, the characteristics of the liquid crystal itself of the liquid crystal display also depend on the temperature, and since the liquid crystal is arranged near the backlight, the liquid crystal characteristics such as contrast are affected by the temperature rise of the backlight. Therefore, even if the brightness of the backlight and the contrast of the liquid crystal display are set optimally at the start of driving the liquid crystal display device, the temperature of the backlight rises with the lapse of usage time, and these brightness and contrast are optimized. It deviates from the brightness.
【０００５】したがって、本発明の目的は、ビデオ信号
の平均レベルが変化してもほぼ一定の表示輝度が可能と
なる液晶表示装置の提供にある。本発明の他の目的は、
バックライトの温度変化に関わらずバックライトの輝度
及び液晶表示器のコントラストをほぼ一定に維持できる
液晶表示装置の提供にある。Therefore, it is an object of the present invention to provide a liquid crystal display device capable of providing a substantially constant display brightness even if the average level of a video signal changes. Another object of the present invention is to
An object of the present invention is to provide a liquid crystal display device capable of maintaining the brightness of the backlight and the contrast of the liquid crystal display substantially constant regardless of the temperature change of the backlight.
【０００６】[0006]
【課題を解決するための手段】本発明の液晶表示装置で
は、表示制御器１６が、ビデオ信号に応じて液晶表示器
１８を制御して、このビデオ信号に対応する画像を表示
させ、バックライト２４が、液晶表示器１６の背面から
この液晶表示器を照明する。平均レベル検出手段２０
は、ビデオ信号の平均レベルを検出し、この検出平均レ
ベルが大きくなるとバックライト２４の輝度を下げるよ
う、バックライト制御器２２によりバックライトを制御
する。また、バックライト２４の近傍に温度検出器２６
を設けて、バックライト制御器２２は、この温度検出器
が検出した温度が高くなるとバックライト２４の輝度を
下げるように制御する。さらに、表示制御器１６は、温
度検出器２６が検出した温度に応じて、液晶表示器１６
のコントラストも制御するようにする。In the liquid crystal display device of the present invention, the display controller 16 controls the liquid crystal display 18 in response to a video signal to display an image corresponding to the video signal and to display a backlight. 24 illuminates the liquid crystal display 16 from the back. Average level detection means 20
Detects the average level of the video signal, and controls the backlight by the backlight controller 22 so as to reduce the brightness of the backlight 24 when the detected average level increases. In addition, a temperature detector 26 is provided near the backlight 24.
The backlight controller 22 controls to reduce the brightness of the backlight 24 when the temperature detected by the temperature detector becomes high. Further, the display controller 16 controls the liquid crystal display 16 according to the temperature detected by the temperature detector 26.
Be sure to control the contrast of.
【０００７】[0007]
【実施例】以下、添付図を参照して本発明の好適な実施
例を説明する。図１は、本発明をテレビジョン受像器に
適用した場合の第１実施例のブロック図である。同調回
路１２は、アンテナ１０で受信したテレビジョン信号の
所望チャンネルの番組を選択し、そのテレビジョン変調
信号を復調回路１４に供給する。復調回路１４は、入力
テレビジョン変調信号を復調して、ビデオ信号及び音声
信号を発生し、ビデオ信号を表示制御器１６及び平均画
像レベル（ＡＰＬ）検出回路（平均レベル検出手段）２
０に供給する。また、復調回路１４からの音声信号は、
音声回路に供給されるが、本発明と関係ないので説明を
省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a first embodiment when the present invention is applied to a television receiver. The tuning circuit 12 selects a program of a desired channel of the television signal received by the antenna 10 and supplies the television modulated signal to the demodulation circuit 14. The demodulation circuit 14 demodulates the input television modulated signal to generate a video signal and an audio signal, and the video signal is displayed on the display controller 16 and an average image level (APL) detection circuit (average level detection means) 2.
Supply 0. Further, the audio signal from the demodulation circuit 14 is
Although it is supplied to the audio circuit, its description is omitted because it is not related to the present invention.
【０００８】表示制御回路１６は、ビデオ信号に応じ
て、液晶表示器１８の各ピクセルの液晶分子集団や配向
を制御して、ビデオ信号に対応する画像を液晶表示器１
８に表示させる。なお、液晶表示器１８の液晶の種類や
その駆動方式は、従来と同じであり、表示制御器１６に
より表示器１８のコントラストも制御できる。ＡＰＬ検
出回路２０は、従来と同様の構成であり、ビデオ信号の
平均レベルを検出し、その検出出力をバックライト制御
器２２に供給する。液晶表示器１８の背面には蛍光ラン
プなどのバックライト２４が配置されており、バックラ
イト制御器２２の制御に応じて液晶供給器１８を背面か
ら照明する。The display control circuit 16 controls the liquid crystal molecule group and orientation of each pixel of the liquid crystal display 18 in accordance with the video signal to display an image corresponding to the video signal on the liquid crystal display 1.
Display in 8. The type of liquid crystal of the liquid crystal display 18 and its driving method are the same as those in the related art, and the display controller 16 can also control the contrast of the display 18. The APL detection circuit 20 has the same configuration as the conventional one, detects the average level of the video signal, and supplies the detection output to the backlight controller 22. A backlight 24 such as a fluorescent lamp is disposed on the back surface of the liquid crystal display device 18, and the liquid crystal supply device 18 is illuminated from the back surface under the control of the backlight control device 22.
【０００９】アンテナ１０、同調回路１２、復調回路１
４、表示制御器１６、液晶表示器１８及びバックライト
２４の動作は、従来の液晶表示装置と同じである。しか
し、本発明では、ＡＰＬ検出回路２０がビデオ信号の平
均レベルを検出し、バックライト制御器２２は、この平
均レベルが高ければバックライト２４の輝度を下げ、ビ
デオ信号の平均レベルが低ければバックライト２４の輝
度を上げる。よって、ビデオ信号の瞬時レベルに応じて
液晶表示器１８自体がその光透過量を制御して表示輝度
を制御する際に、ビデオ信号の平均レベルに応じて表示
画面全体の輝度が暗くなり過ぎたり、明るくなり過ぎる
のを効果的に防止でき、見やすい画面を表示できる。Antenna 10, tuning circuit 12, demodulation circuit 1
The operations of 4, the display controller 16, the liquid crystal display 18, and the backlight 24 are the same as those of the conventional liquid crystal display device. However, in the present invention, the APL detection circuit 20 detects the average level of the video signal, and the backlight controller 22 reduces the brightness of the backlight 24 when the average level is high, and the backlight controller 22 when the average level of the video signal is low. Increase the brightness of the light 24. Therefore, when the liquid crystal display 18 itself controls the light transmission amount according to the instantaneous level of the video signal to control the display brightness, the brightness of the entire display screen becomes too dark depending on the average level of the video signal. , It is possible to effectively prevent it from becoming too bright and display a screen that is easy to see.
【００１０】図２は、本発明の第２実施例のブロック図
であり、図１と同じブロックは同じ参照番号で示し、図
１の実施例と異なる点のみ説明する。この実施例では、
バックライト制御器２２は、ＡＰＬ検出回路２０の代わ
りに温度検出器２６の出力信号に応じて、バックライト
２４を制御する。温度検出器２６は、半導体のＰＮ接合
や熱電対を用いて、バックライト２４及び液晶表示器１
８周辺の温度に対応する電圧を発生する。バックライト
制御器２２は、温度検出器２６の出力電圧が高くなる
と、バックライト２４の輝度を下げるように制御するの
で、バックライト２４周辺の温度が上昇してもバックラ
イト２４の輝度が高くなるのを防止できる。よって、バ
ックライト温度の経時変化に関わらず、液晶表示器１８
をほぼ一定輝度で照明でき、安定した画像が得られる。FIG. 2 is a block diagram of a second embodiment of the present invention. The same blocks as those in FIG. 1 are designated by the same reference numerals, and only the points different from the embodiment of FIG. 1 will be described. In this example,
The backlight controller 22 controls the backlight 24 according to the output signal of the temperature detector 26 instead of the APL detection circuit 20. The temperature detector 26 uses a semiconductor PN junction or a thermocouple and uses the backlight 24 and the liquid crystal display 1.
A voltage corresponding to the temperature around 8 is generated. Since the backlight controller 22 controls so that the brightness of the backlight 24 is lowered when the output voltage of the temperature detector 26 becomes high, the brightness of the backlight 24 becomes high even if the temperature around the backlight 24 rises. Can be prevented. Therefore, regardless of the change in backlight temperature over time, the liquid crystal display 18
Can be illuminated with almost constant brightness, and a stable image can be obtained.
【００１１】図３は、本発明の第３実施例のブロック図
である。この実施例では、温度検出器２６の出力信号を
バックライト制御器２２に供給するのは図２の実施例と
同じであるが、温度検出信号を更に表示制御器１６にも
供給している。表示制御器１６は、液晶表示器１８周辺
の温度に応じて、この液晶表示器１８のコントラストを
調整し、温度に関係なくコントラストをほぼ一定にす
る。よって、バックライト２４の輝度及び液晶表示器１
８の輝度の両方が温度に影響されにくくなり、安定した
画像が得られる。FIG. 3 is a block diagram of a third embodiment of the present invention. In this embodiment, the output signal of the temperature detector 26 is supplied to the backlight controller 22 as in the embodiment of FIG. 2, but the temperature detection signal is further supplied to the display controller 16. The display controller 16 adjusts the contrast of the liquid crystal display 18 according to the temperature around the liquid crystal display 18 so that the contrast is substantially constant regardless of the temperature. Therefore, the brightness of the backlight 24 and the liquid crystal display 1
Both of the luminances of 8 are less affected by the temperature, and a stable image can be obtained.
【００１２】図４は、本発明の第４実施例のブロック図
である。この実施例は、図１及び図２の実施例を組み合
わせたものであり、バックライト制御器２２は、ＡＰＬ
検出回路２０及び温度検出器２６の両方の出力信号を加
算し、この加算結果に応じてバックライト２４の輝度を
制御する。よって、バックライト２４の輝度は、このバ
ックライトの周辺温度に関係なくほぼ一定になろうとす
ると共に、ビデオ信号の平均レベルの変動に応じて変化
する。よって、温度及びビデオ信号平均レベルに関係な
く安定した輝度の画像が得られる。FIG. 4 is a block diagram of the fourth embodiment of the present invention. This embodiment is a combination of the embodiments of FIGS. 1 and 2, in which the backlight controller 22 is
The output signals of both the detection circuit 20 and the temperature detector 26 are added, and the brightness of the backlight 24 is controlled according to the addition result. Therefore, the brightness of the backlight 24 tends to be substantially constant regardless of the ambient temperature of the backlight, and changes according to the fluctuation of the average level of the video signal. Therefore, an image with stable luminance can be obtained regardless of the temperature and the average level of the video signal.
【００１３】図５は、本発明の第５実施例のブロック図
である。この実施例は、図３及び図４の実施例を組み合
わせたものであり、図４の実施例に比較して、液晶表示
器１８周辺の温度に応じてこの表示器のコントラストが
変化しないように制御される。よって、より一層安定な
表示画像が得られる。FIG. 5 is a block diagram of the fifth embodiment of the present invention. This embodiment is a combination of the embodiments of FIG. 3 and FIG. 4, and compared with the embodiment of FIG. 4, the contrast of this display does not change according to the temperature around the liquid crystal display 18. Controlled. Therefore, a more stable display image can be obtained.
【００１４】上述は本発明の好適な実施例について説明
したが、本発明の要旨を逸脱することなく、種々の変形
及び変更が可能である。例えば、本発明は、テレビジョ
ン受像器以外に、コンピュータの表示装置や、各種制御
装置の表示装置などにも利用できる。Although the preferred embodiment of the present invention has been described above, various modifications and changes can be made without departing from the gist of the present invention. For example, the present invention can be applied to a display device of a computer, a display device of various control devices, and the like, in addition to the television receiver.
【００１５】[0015]
【発明の効果】上述の如く本発明によれば、ビデオ信号
の平均レベルに関係なく、ほぼ一定の輝度の画像を表示
できると共に、バックライト及び液晶表示器周辺の温度
変化に関わらず、バックライトの輝度及び液晶表示器の
コントラストをほぼ一定に維持でる。よって、常に安定
した表示画像が得られる。As described above, according to the present invention, an image having substantially constant brightness can be displayed regardless of the average level of the video signal, and the backlight can be displayed regardless of the temperature change around the backlight and the liquid crystal display. The brightness and the contrast of the liquid crystal display can be maintained almost constant. Therefore, a stable display image can always be obtained.
【図１】本発明の第１実施例のブロック図である。FIG. 1 is a block diagram of a first embodiment of the present invention.
【図２】本発明の第２実施例のブロック図である。FIG. 2 is a block diagram of a second embodiment of the present invention.
【図３】本発明の第３実施例のブロック図である。FIG. 3 is a block diagram of a third embodiment of the present invention.
【図４】本発明の第４実施例のブロック図である。FIG. 4 is a block diagram of a fourth embodiment of the present invention.
【図５】本発明の第５実施例のブロック図である。FIG. 5 is a block diagram of a fifth embodiment of the present invention.
【符号の説明】 １０ アンテナ １２ 同調回路 １４ 復調回路 １６ 表示制御器 １８ 液晶表示器 ２０ ＡＰＬ検出回路（平均レベル検出手段） ２２ バックライト制御器 ２４ バックライト ２６ 温度検出器[Explanation of Codes] 10 Antenna 12 Tuning Circuit 14 Demodulation Circuit 16 Display Controller 18 Liquid Crystal Display 20 APL Detection Circuit (Average Level Detection Means) 22 Backlight Controller 24 Backlight 26 Temperature Detector
Claims (5)
晶表示器に上記ビデオ信号に対応する画像を表示する表
示制御器と、 上記液晶表示器の背面から上記液晶表示器を照明するバ
ックライトと、 上記ビデオ信号の平均レベルを検出する平均レベル検出
手段と、 該平均レベル検出手段が検出した平均レベルが大きくな
ると上記バックライトの輝度を下げるように上記バック
ライトを制御するバックライト制御器とを具えた液晶表
示装置。1. A liquid crystal display, a display controller for controlling the liquid crystal display according to a video signal to display an image corresponding to the video signal on the liquid crystal display, and a rear surface of the liquid crystal display. From the above, a backlight for illuminating the liquid crystal display, an average level detecting means for detecting an average level of the video signal, and an average level detecting means for decreasing the brightness of the backlight when the average level detected by the average level detecting means increases. A liquid crystal display device comprising a backlight controller for controlling a backlight.
晶表示器に上記ビデオ信号に対応する画像を表示する表
示制御器と、 上記液晶表示器の背面から上記液晶表示器を照明するバ
ックライトと、 該バックライト近傍に配置された温度検出器と、 該温度検出器が検出した温度が高くなると上記バックラ
イトの輝度を下げるように上記バックライトを制御する
バックライト制御器とを具えた液晶表示装置。2. A liquid crystal display, a display controller for controlling the liquid crystal display according to a video signal to display an image corresponding to the video signal on the liquid crystal display, and a rear surface of the liquid crystal display. A backlight for illuminating the liquid crystal display, a temperature detector arranged in the vicinity of the backlight, and controlling the backlight so as to reduce the brightness of the backlight when the temperature detected by the temperature detector becomes high. Liquid crystal display device with a back light controller.
出した温度に応じて、上記液晶表示器のコントラストも
制御することを特徴とする請求項２の液晶表示装置。3. The liquid crystal display device according to claim 2, wherein the display controller also controls the contrast of the liquid crystal display according to the temperature detected by the temperature detector.
平均レベル検出手段を更に具え、上記バックライト制御
器は、上記平均レベル検出手段が検出した平均レベルが
大きくなると上記バックライトの輝度を下げるようにも
上記バックライトを制御することを特徴とする請求項２
の液晶表示装置。4. The average level detecting means for detecting an average level of the video signal is further provided, and the backlight controller lowers the brightness of the backlight when the average level detected by the average level detecting means increases. The backlight is also controlled by the above-mentioned method.
Liquid crystal display device.
出した温度に応じて、上記液晶表示器のコントラストも
制御することを特徴とする請求項４の液晶表示装置。5. The liquid crystal display device according to claim 4, wherein the display controller also controls the contrast of the liquid crystal display according to the temperature detected by the temperature detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7031699A JPH08201812A (en) | 1995-01-27 | 1995-01-27 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7031699A JPH08201812A (en) | 1995-01-27 | 1995-01-27 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08201812A true JPH08201812A (en) | 1996-08-09 |
Family
ID=12338328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7031699A Pending JPH08201812A (en) | 1995-01-27 | 1995-01-27 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08201812A (en) |
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