JP2000321571A - Liquid crystal display device and backlight luminances adjusting method - Google Patents
Liquid crystal display device and backlight luminances adjusting methodInfo
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- JP2000321571A JP2000321571A JP11128837A JP12883799A JP2000321571A JP 2000321571 A JP2000321571 A JP 2000321571A JP 11128837 A JP11128837 A JP 11128837A JP 12883799 A JP12883799 A JP 12883799A JP 2000321571 A JP2000321571 A JP 2000321571A
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- liquid crystal
- crystal display
- circuit
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- video
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- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示装置に関
し、特にＡＰＬにより液晶ディスプレイのバックライト
の輝度を制御する液晶表示装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device for controlling the brightness of a backlight of a liquid crystal display by APL.
【０００２】[0002]
【従来の技術】近年陰極線管（ＣＲＴ）に代わって液晶
表示装置がテレビジョン受像機や、コンピュータの画像
表示に広く使われるようになってきた。液晶表示装置で
は電極の設けられた２枚の透明基板の間に液晶を封入
し、マトリックス状に配置された駆動電極単位に電圧を
制御することによって液晶分子の集団や配向を制御し、
透明基板の背面に設けられたバックライトからの照射光
の透過率を変化させることによって液晶ディスプレイに
画面を表示することが行われている。2. Description of the Related Art In recent years, liquid crystal display devices have been widely used instead of cathode ray tubes (CRTs) for image display of television receivers and computers. In a liquid crystal display device, liquid crystal is sealed between two transparent substrates provided with electrodes, and the voltage and group of liquid crystal molecules are controlled by controlling the voltage of each drive electrode arranged in a matrix, thereby controlling the liquid crystal molecules.
A screen is displayed on a liquid crystal display by changing the transmittance of irradiation light from a backlight provided on the back surface of a transparent substrate.
【０００３】液晶表示装置の画面のコントラストやバッ
クライトの輝度は、一般に操作者が調整して画面を見易
い状態にすることが可能であるが、テレビジョン受像機
などに用いた場合、受信する番組の内容によりビデオ信
号のレベルが異なってくる。日中の屋外のような場合に
はビデオ信号のレベルが高くなり表示画面全体が明るく
なり過ぎ、夜景のような場合にはビデオ信号のレベルが
低くなり表示画面全体が暗くなり過ぎ、表示画面全体が
見にくくなるという問題点があった。[0003] The contrast of the screen of a liquid crystal display device and the brightness of the backlight can be generally adjusted by an operator so that the screen can be easily viewed. , The level of the video signal differs. In the case of outdoors in the daytime, the level of the video signal becomes high and the whole display screen becomes too bright, and in the case of night view, the level of the video signal becomes low and the whole display screen becomes too dark, and the whole display screen is displayed. However, there is a problem that it becomes difficult to see.
【０００４】この問題を解決するための方法が提案され
ており、特開平６−２２２３２８号公報で開示された技
術では、表示画像の平均的な明るさのレベル（ＡＰＬ）
をビデオ信号から検出し、設定レベルと比較することに
よって液晶ディスプレイパネルの共通電極側に印加する
コモンレベル電圧を黒表示に適した黒コモンレベル電圧
と白表示に適した白コモンレベル電圧とに切り換えるこ
とによりビデオ信号のレベルを調節している。A method for solving this problem has been proposed. In the technique disclosed in Japanese Patent Application Laid-Open No. Hei 6-222328, an average brightness level (APL) of a display image is disclosed.
Is detected from the video signal and is compared with a set level to switch the common level voltage applied to the common electrode side of the liquid crystal display panel between a black common level voltage suitable for black display and a white common level voltage suitable for white display. Thus, the level of the video signal is adjusted.
【０００５】また、特開平８−２０１８１２号公報で開
示された技術では、ビデオ信号の平均レベル（ＡＰＬ）
を検出する手段を設け、検出した平均レベルが大きくな
るとバックライトの輝度を下げる制御器を設けて表示画
像の明るさを調節している。In the technique disclosed in Japanese Patent Application Laid-Open No. 8-201812, the average level (APL)
And a controller for lowering the brightness of the backlight when the detected average level increases increases the brightness of the display image.
【０００６】[0006]
【発明が解決しようとする課題】しかし、特開平６−２
２２３２８号公報や特開平８−２０１８１２号公報で開
示された従来の技術では、画面全体の明るさの制御はで
きていたが、画像の明るさのレベルが部分的に異なった
場合に画面の部分に関して制御することはできなかっ
た。 画面に部分的に明るいところがあったり暗いとこ
ろがあった場合には制御はビデオ信号の平均レベルで行
われるのでその部分に対応した調整は行われずそのため
その部分の画像の見にくさは解消されず、例えば画面の
半分が明るく、半分が暗いといった場合に検出したＡＰ
Ｌは高くも低くもならないので調整が行われず、明るい
部分でも暗い部分でも見にくいという現象が現れ、特に
画面が大きくなるに従って問題となってきた。However, Japanese Patent Laid-Open No. 6-2 / 1994
In the related art disclosed in Japanese Patent Application Laid-Open No. 22328 and Japanese Patent Application Laid-Open No. Hei 8-201812, the brightness of the entire screen can be controlled. However, when the brightness level of the image partially differs, Could not be controlled. If there is a bright or dark part of the screen, control is performed at the average level of the video signal, so adjustments corresponding to that part are not made, so that it is difficult to see the image of that part, for example, AP detected when half of the screen is bright and half is dark
Since L is neither high nor low, no adjustment is performed, and a phenomenon appears in which it is difficult to see both bright and dark parts, and this has become a problem especially as the screen becomes larger.
【０００７】本発明の目的は、画面内に明るい範囲や暗
い範囲があった場合でも、その範囲を見易くなるように
調整できる液晶表示装置と輝度調整方法を提供すること
にある。It is an object of the present invention to provide a liquid crystal display device and a brightness adjustment method which can adjust a bright range or a dark range in a screen so that the range can be easily viewed.
【０００８】[0008]
【課題を解決するための手段】本発明の液晶表示装置
は、画像を表示する液晶ディスプレイと、液晶ディスプ
レイを背面から照射する複数の光源を有するバックライ
トと、入力したビデオ信号の映像信号を光源の配置に対
応した複数の映像領域に分割する分割回路と、映像領域
ごとに分割された映像信号のそれぞれの平均輝度を検出
するＡＰＬ（平均輝度）検出回路と、各映像領域の映像
信号の平均輝度の検出結果および映像領域のそれぞれの
相関とに応じて、各映像領域のゲインを調整するための
演算を行う信号処理回路と、信号処理回路の演算結果に
基づいて、それぞれの光源の駆動用インバータのデュー
ティー比を制御するインバータ制御回路と、復調回路か
ら出力された映像信号を液晶ディスプレイに画像表示す
るために必要なタイミングパルスを生成し、ＲＧＢの映
像信号とタイミングパルスとを液晶ディスプレイへ出力
する液晶表示回路とを備える分割回路が複数の領域に対
応した複数のブランキング回路を有し、ＡＰＬ検出回路
は複数の領域に対応して複数に分割され、それぞれのブ
ランキング回路には、復調回路から入力するビデオ信号
の映像信号が複数の領域に対応した複数の映像領域に分
割されて並列に入力され、それぞれの分割されたＡＰＬ
検出回路には、対応するブランキング回路より分割され
た映像信号が入力してそれぞれの平均輝度が検出されて
もよく、分割回路が映像信号をデジタル信号に変換する
Ａ／Ｄ変換回路と、デジタル化された映像信号を記憶す
るメモリとを備え、信号処理回路は、メモリから入力し
たデジタル化された映像信号を複数の領域に対応した複
数の映像領域に分割してＡＰＬ検出回路に出力してもよ
く、Ａ／Ｄ変換回路とメモリとＡＰＬ検出回路とが、信
号処理回路と一体の構成となっていてもよい。A liquid crystal display device according to the present invention comprises a liquid crystal display for displaying an image, a backlight having a plurality of light sources for illuminating the liquid crystal display from the back, and a light source for transmitting a video signal of an input video signal. , A dividing circuit for dividing the image signal into a plurality of video regions, an APL (average luminance) detecting circuit for detecting an average luminance of each of the video signals divided for each video region, and an averaging of the video signal of each video region. A signal processing circuit that performs an operation for adjusting the gain of each image area according to the detection result of the luminance and each correlation of the image area; and a signal processing circuit that drives each light source based on the operation result of the signal processing circuit. An inverter control circuit for controlling the duty ratio of the inverter; and a timer for displaying the video signal output from the demodulation circuit on a liquid crystal display. A liquid crystal display circuit that generates a scanning pulse and outputs an RGB video signal and a timing pulse to a liquid crystal display has a plurality of blanking circuits corresponding to a plurality of regions, and the APL detection circuit has a plurality of regions. In each blanking circuit, the video signal of the video signal input from the demodulation circuit is divided into a plurality of video areas corresponding to a plurality of areas, and is input in parallel to each blanking circuit. APL
The detection circuit may receive the video signal divided from the corresponding blanking circuit and detect the respective average luminances. The division circuit converts the video signal into a digital signal, and an A / D conversion circuit. And a memory for storing the digitized video signal. The signal processing circuit divides the digitized video signal input from the memory into a plurality of video areas corresponding to the plurality of areas, and outputs the divided video area to the APL detection circuit. Alternatively, the A / D conversion circuit, the memory, and the APL detection circuit may be integrated with the signal processing circuit.
【０００９】光源は蛍光管であっても、エレクトロルミ
ネッセンスパネルであってもよく、光源が液晶ディスプ
レイの周辺に配置され、照射光が導光板で液晶ディスプ
レイのそれぞれの分担領域に導光されているエッジライ
ト方式の構成であってもよく、光源が液晶ディスプレイ
の下面でそれぞれの分担領域に直接配置されている直下
方式の構成であってもよい。The light source may be a fluorescent tube or an electroluminescence panel. The light source is arranged around the liquid crystal display, and the light is guided by the light guide plate to the respective areas of the liquid crystal display. An edge light type configuration may be used, or a direct type configuration in which a light source is directly arranged in each of the shared areas on the lower surface of the liquid crystal display.
【００１０】また、放送波を受信するアンテナと、受信
した放送波をビデオ信号に変換する復調回路とを有して
いてもよい。[0010] The apparatus may further include an antenna for receiving the broadcast wave and a demodulation circuit for converting the received broadcast wave into a video signal.
【００１１】本発明の液晶表示装置のバックライト輝度
調整方法は、複数の光源を有するバックライトを備えた
液晶表示装置のバックライト輝度調整方法であって、入
力した映像信号を、バックライトの光源の配置に応じて
複数の領域に分割し、分割された映像信号のそれぞれの
平均輝度（ＡＰＬ）を検出し、検出されたそれぞれの領
域の平均輝度と領域のそれぞれの相関とに応じて、望ま
しい各領域のゲインを演算し、演算されたゲインにより
光源駆動用のインバータのデューティー比を制御してそ
れぞれの光源の明るさを調整する。A backlight brightness adjusting method for a liquid crystal display device according to the present invention is a backlight brightness adjusting method for a liquid crystal display device provided with a backlight having a plurality of light sources. Is divided into a plurality of areas in accordance with the arrangement of the video signals, an average luminance (APL) of each of the divided video signals is detected, and the average luminance (APL) of each detected area and a correlation of each area are desirable. The gain of each area is calculated, and the duty ratio of the inverter for driving the light source is controlled by the calculated gain to adjust the brightness of each light source.
【００１２】映像信号が、アンテナで受信された放送波
をビデオ信号に復調し、復調されたビデオ信号に含まれ
る映像信号であってもよい。[0012] The video signal may be a video signal which is obtained by demodulating a broadcast wave received by an antenna into a video signal and included in the demodulated video signal.
【００１３】本発明により、分割された画面ごとにバッ
クライトの輝度調整が行われるので、液晶ディスプレイ
の画面内におけるコントラストがさらに高められる。According to the present invention, since the brightness of the backlight is adjusted for each divided screen, the contrast in the screen of the liquid crystal display is further enhanced.
【００１４】[0014]
【発明の実施の形態】次に、本発明の実施の形態につい
て図面を参照して説明する。図１は本発明の実施の形態
の液晶表示装置のブロック構成図である。Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention.
【００１５】本発明の実施の形態の液晶表示装置は、液
晶ディスプレイ１０８と、液晶ディスプレイ１０８を背
面から照射するバックライトの光源１０６と、放送波を
受信するアンテナ１０１と、受信した放送波をビデオ信
号に変換する復調回路１０２と、復調回路１０２から出
力されるビデオ信号の映像信号を指示されたタイミング
パルスにより光源（１０６）の配置に対応して水平映像
期間をｍ個に、垂直映像期間をｎ個に分割する分割回路
１０３と、入力されるｍ×ｎ個の分割された映像領域の
映像信号のそれぞれの平均輝度を平均直流電圧レベルと
してｍ×ｎ個検出するＡＰＬ（平均輝度）検出回路１０
４と、光源１０６の配置に応じて水平映像期間をｍ個
に、垂直映像期間をｎ個に分割するタイミングパルスを
生成して分割回路１０３に出力し、ＡＰＬ検出回路１０
４から出力されたｍ×ｎ個の領域のＡＰＬの検出結果お
よびｍ×ｎ個の領域のそれぞれの相関に応じて、ＡＰＬ
が高い場合は全体のゲインを小さくして白側の階調がで
るようにし、またＡＰＬが低い場合は全体のゲインを高
くして黒側の階調が出るようにするように演算を行い、
インバータ制御回路１０５に制御信号を出力する信号処
理回路１０９と、信号処理回路１０９の制御信号を受け
て、それぞれの光源１０６のインバータのデューティー
比を制御し、光源１０６の明るさを調整するインバータ
制御回路１０５と、復調回路１０２から出力されたビデ
オ信号を液晶ディスプレイ１０８に画像表示すために必
要なタイミングパルスなどを生成し、ＲＧＢの映像信号
とタイミングパルスとを液晶ディスプレイ１０８へ出力
する液晶表示回路１０７とを備える。A liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display 108, a light source 106 of a backlight for illuminating the liquid crystal display 108 from the back, an antenna 101 for receiving broadcast waves, and a video signal for receiving broadcast waves. The demodulation circuit 102 converts the video signal of the video signal output from the demodulation circuit 102 into m signals in accordance with the arrangement of the light source (106) and the vertical image period in accordance with the arrangement of the light source (106). a dividing circuit 103 for dividing the image signal into n, and an APL (average luminance) detecting circuit for detecting the average luminance of each of the input m × n divided video area video signals as an average DC voltage level by m × n 10
4 and a timing pulse for dividing the horizontal image period into m and the vertical image period into n according to the arrangement of the light source 106, and outputs the generated timing pulse to the division circuit 103.
4 according to the detection result of the APL of the m × n areas output from 4 and the respective correlations of the m × n areas.
When the APL is high, the overall gain is reduced so that the gray scale on the white side is obtained, and when the APL is low, the arithmetic is performed such that the overall gain is increased and the gray scale on the black side is obtained,
A signal processing circuit 109 that outputs a control signal to the inverter control circuit 105; and an inverter control that receives the control signal of the signal processing circuit 109, controls the duty ratio of the inverter of each light source 106, and adjusts the brightness of the light source 106. A circuit 105 and a liquid crystal display circuit for generating timing pulses and the like necessary for displaying a video signal output from the demodulation circuit 102 on the liquid crystal display 108 and outputting RGB video signals and timing pulses to the liquid crystal display 108 107.
【００１６】ここで、バックライトは光源１０８の配置
に対応して横方向にｍ個、縦方向にｎ個の独立した領域
に分割されているものとする。Here, it is assumed that the backlight is divided into m horizontal areas and n vertical areas in accordance with the arrangement of the light sources 108.
【００１７】次に、本発明の本発明の実施の形態の液晶
表示装置の動作について図１を参照して説明する。Next, the operation of the liquid crystal display device according to the embodiment of the present invention will be described with reference to FIG.
【００１８】アンテナ１０１で放送波を受信し、受信さ
れた放送波は復調回路１０２で復調される。復調された
ビデオ信号の内、映像信号が分割回路１０３と液晶表示
回路１０７とに入力される。分割回路１０３では入力し
た映像信号の映像期間を、バックライトの光源１０６の
配置に応じて水平方向にｍ分割、垂直方向にｎ分割し、
分割された映像信号は、ＡＰＬ（平均輝度）検出回路１
０４に入力される。ＡＰＬ検出回路１０４では、入力さ
れたｍ×ｎ個に分割された映像領域の映像信号のそれぞ
れの平均輝度（ＡＰＬ）を平均直流電圧レベルとしてｍ
×ｎ個検出して信号処理回路１０９に出力する。信号処
理回路１０９において、ＡＰＬ検出回路１０４から出力
されたｍ×ｎ個の領域のＡＰＬの検出結果およびｍ×ｎ
個の領域のそれぞれの相関に応じて、ＡＰＬが高い場合
は全体のゲインを小さくして白側の階調がでるように
し、またＡＰＬが低い場合は全体のゲインを高くして黒
側の階調が出るようにするように演算を行い、インバー
タ制御回路１０５に制御信号を出力する。インバータ制
御回路１０５では、それぞれの光源１０６のインバータ
のデューティー比を制御し、光源１０６の明るさを調整
する。A broadcast wave is received by an antenna 101, and the received broadcast wave is demodulated by a demodulation circuit 102. The video signal of the demodulated video signal is input to the dividing circuit 103 and the liquid crystal display circuit 107. The dividing circuit 103 divides the video period of the input video signal into m in the horizontal direction and n in the vertical direction according to the arrangement of the light source 106 of the backlight.
An APL (Average Brightness) detection circuit 1
04 is input. The APL detection circuit 104 sets the average luminance (APL) of each of the input m × n divided video signals of the video area as an average DC voltage level,
× n are detected and output to the signal processing circuit 109. In the signal processing circuit 109, APL detection results of m × n areas output from the APL detection circuit 104 and m × n
In accordance with the respective correlations of the individual regions, when the APL is high, the overall gain is reduced so that the gray level on the white side is obtained. When the APL is low, the overall gain is increased and the gray level on the black side is increased. Calculation is performed so that the tone is adjusted, and a control signal is output to the inverter control circuit 105. The inverter control circuit 105 controls the duty ratio of the inverter of each light source 106 to adjust the brightness of the light source 106.
【００１９】一方、液晶表示回路１０７に入力したビデ
オ信号はＲＧＢ信号に分けられ、タイミングパルス信号
と共に、液晶ディスプレイ１０８へ出力され、液晶ディ
スプレイ１０８で画像表示される。On the other hand, the video signal input to the liquid crystal display circuit 107 is divided into RGB signals, output to a liquid crystal display 108 together with a timing pulse signal, and displayed on the liquid crystal display 108.
【００２０】これにより、映像信号制御だけではなく、
実際の輝度となる光源の明るさも画面のｍ×ｎ個のそれ
ぞれの領域内において変わるため、画面全体としてもよ
りコントラストのある画像とすることができる。Thus, not only video signal control but also
Since the brightness of the light source, which is the actual brightness, also changes in each of the m × n areas of the screen, an image with higher contrast can be obtained as a whole screen.
【００２１】次に本発明の実施の形態の液晶表示装置の
分割回路１０３とＡＰＬ検出回路１０４の動作をアナロ
グによる分割方式で行った場合について説明する。図２
はアナログによる分割方式を用いた本発明の実施の形態
の液晶表示装置のブロック構成図である。復調回路２０
２から出力されるビデオ信号の映像信号は、信号処理回
路２０９で生成された、光源２０６の配置に応じて水平
映像期間をｍ個に、垂直映像期間をｎ個に分割するタイ
ミングパルスにより分割されて、分割回路であるｍ×ｎ
個のブランキング回路２１０に並列に入力される。ｍ×
ｎ個に分割された画像のビデオ信号は次にｍ×ｎ個のＡ
ＰＬ検出回路２０４に入力される。ＡＰＬ検出回路２０
４の検出結果は信号処理回路２０９に送られ、信号処理
回路２０９にてＡＰＬの検出結果およびｍ×ｎ個の領域
の相関に応じて演算が行われる。この演算結果をもとに
信号処理回路２０９からインバータ制御回路２０５へ制
御信号が送られ、インバータ制御回路２０５では信号処
理回路２０９からの制御信号をもとに各光源２０６を制
御する。復調回路２０２から液晶表示回路２０７に入力
されたビデオ信号はＲＧＢ信号に分けられ、タイミング
パルス信号と共に、液晶ディスプレイ２０８へ出力さ
れ、液晶ディスプレイ２０８で画像表示される。Next, a case where the operations of the dividing circuit 103 and the APL detecting circuit 104 of the liquid crystal display device according to the embodiment of the present invention are performed by an analog dividing method will be described. FIG.
1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention using an analog division method. Demodulation circuit 20
2 is divided by a timing pulse generated by the signal processing circuit 209, which divides the horizontal video period into m and the vertical video period into n according to the arrangement of the light source 206. M × n which is a dividing circuit
The signals are input to the blanking circuits 210 in parallel. mx
The video signal of the image divided into n is then m × n A
The signal is input to the PL detection circuit 204. APL detection circuit 20
The detection result of No. 4 is sent to the signal processing circuit 209, and the signal processing circuit 209 performs an operation in accordance with the detection result of the APL and the correlation of m × n areas. A control signal is sent from the signal processing circuit 209 to the inverter control circuit 205 based on the calculation result, and the inverter control circuit 205 controls each light source 206 based on the control signal from the signal processing circuit 209. The video signal input from the demodulation circuit 202 to the liquid crystal display circuit 207 is divided into RGB signals, output to the liquid crystal display 208 together with the timing pulse signal, and displayed on the liquid crystal display 208.
【００２２】次に本発明の実施の形態の液晶表示装置の
分割回路１０３と信号処理回路１０９とＡＰＬ検出回路
２０４の動作をデジタルによる分割方式で行った場合に
ついて説明する。図３はデジタルによる分割方式を用い
た本発明の実施の形態の液晶表示装置のブロック構成図
である。図１の分割回路１０３はＡ／Ｄ変換回路３１１
とメモリ３１２とで構成される。Next, a case where the operations of the dividing circuit 103, the signal processing circuit 109, and the APL detecting circuit 204 of the liquid crystal display device according to the embodiment of the present invention are performed by a digital dividing method will be described. FIG. 3 is a block diagram of a liquid crystal display according to an embodiment of the present invention using a digital division method. 1 is an A / D conversion circuit 311.
And a memory 312.
【００２３】復調回路３０２から出力されるビデオ信号
の映像信号は、Ａ／Ｄ変換回路３１１でデジタルに変換
された後、メモリ３１２に格納される。メモリ３１２に
格納されたデジタルデータを信号処理回路３０９が読み
出し、読み出されたされたデジタルデータは、信号処理
回路３０９で生成された、光源３０６の配置に応じて水
平映像期間をｍ個に、垂直映像期間をｎ個に分割するタ
イミングパルスにより分割されて、分割されたデータを
ＡＰＬ検出回路３０４へ送信する。ＡＰＬ検出回路３０
４で検出されたＡＰＬデータは再び、信号処理回路３０
９に戻り、ＡＰＬの検出結果およびｍ×ｎ個の領域の相
関に応じて演算が行われる。この演算結果をもとに信号
処理回路３０９からインバータ制御回路３０５へ制御信
号が送られ、インバータ制御回路３０５はその制御信号
をもとに光源３０６を制御する。Ａ／Ｄ変換回路３１１
で変換されたデジタルのビデオ信号データは液晶表示回
路３０７へも送られる。そして液晶表示回路３０７か
ら、ＲＧＢのデジタル信号とタイミングパルス信号が液
晶ディスプレイ３０８へ送られ、液晶ディスプレイ３０
８で画像表示される。The video signal of the video signal output from the demodulation circuit 302 is converted into a digital signal by an A / D conversion circuit 311 and stored in a memory 312. The digital data stored in the memory 312 is read by the signal processing circuit 309, and the read digital data is generated by the signal processing circuit 309 into m horizontal video periods according to the arrangement of the light sources 306, The vertical data period is divided by a timing pulse that divides the period into n, and the divided data is transmitted to the APL detection circuit 304. APL detection circuit 30
The APL data detected at 4 is again transmitted to the signal processing circuit 30.
9, the calculation is performed according to the detection result of the APL and the correlation between the m × n areas. A control signal is sent from the signal processing circuit 309 to the inverter control circuit 305 based on the calculation result, and the inverter control circuit 305 controls the light source 306 based on the control signal. A / D conversion circuit 311
The digital video signal data converted in step (1) is also sent to the liquid crystal display circuit 307. Then, the RGB digital signal and the timing pulse signal are sent from the liquid crystal display circuit 307 to the liquid crystal display 308, and the liquid crystal display 30
8 is displayed.
【００２４】メモリ３１２とＡＰＬ検出３０４、および
Ａ／Ｄ変換回路３１１を信号処理回路３０９内部にある
ものと考えると図３の破線枠が広義の信号処理回路３０
９＃となり、回路を簡略化することができる。Considering that the memory 312, the APL detection circuit 304, and the A / D conversion circuit 311 are inside the signal processing circuit 309, the broken line frame in FIG.
9 #, and the circuit can be simplified.
【００２５】図４は本発明の実施の形態の液晶表示装置
で実際に蛍光管が制御されている状態を示す液晶ディス
プレイの模式図であり、光源１０６を蛍光管として４本
の蛍光管４０６ａ〜４０６ｄをエッジライト方式で液晶
ディスプレイ４０８の４辺のそれぞれの右半分に配置
し、導光板で照射光を液晶ディスプレイ４０８のそれぞ
れの分担領域に導光している。従ってｍ×ｎはここでは
２×２である。信号処理回路４０９で画面全体として問
題がないように演算された結果が各領域の明るさを制御
するインバータ制御回路４０５にフィードバックされ、
４つの領域の平均的な輝度がそれぞれ最適となるように
蛍光管４０６ａ〜４０６ｄが調整されている。FIG. 4 is a schematic diagram of a liquid crystal display showing a state in which the fluorescent tubes are actually controlled in the liquid crystal display device according to the embodiment of the present invention. 406 d are arranged in the right half of each of four sides of the liquid crystal display 408 by the edge light method, and the light guide plate guides the irradiation light to the respective assigned areas of the liquid crystal display 408. Therefore, m × n is 2 × 2 here. The result calculated by the signal processing circuit 409 so that there is no problem on the entire screen is fed back to the inverter control circuit 405 for controlling the brightness of each area,
The fluorescent tubes 406a to 406d are adjusted so that the average luminance of the four regions is optimum.
【００２６】本実施の形態では放送波をアンテナで受信
するテレビジョン受像機で説明したが、テレビジョン受
像機に限定されるものではなく映像信号が直接入力する
コンピュータなどのの画像表示にも広く適用できる。Although the present embodiment has been described with respect to a television receiver that receives a broadcast wave with an antenna, the present invention is not limited to the television receiver, and is widely applied to image display of a computer or the like to which a video signal is directly input. Applicable.
【００２７】ここでは、光源を蛍光管とし、エッジライ
ト方式の配列としたが、光源は蛍光管に限定されるもの
ではなく、エレクトロルミネッセンスパネル（ＥＬ）で
あってもよく、配列も光源を液晶ディスプレイの下面に
配列する直下方式であってもよい。直下方式の方が面の
分割数を増加させることが容易である。Here, the light source is a fluorescent tube and an edge light type array is used. However, the light source is not limited to the fluorescent tube, and may be an electroluminescence panel (EL). It may be a direct type arranged on the lower surface of the display. In the direct type, it is easier to increase the number of surface divisions.
【００２８】[0028]
【発明の効果】以上説明したように本発明は、液晶ディ
スプレイなどの画面内における部分的に平均輝度の高い
ところや低いところに対して、映像信号の信号制御だけ
ではなく、それぞれの分割された領域において光源の明
るさも制御することができるので、全画面内において、
よりコントラスト感のある画像を作り出すことができる
という効果がある。As described above, according to the present invention, not only the signal control of the video signal but also the division of each of the portions where the average luminance is high or low in a screen such as a liquid crystal display is performed. Since the brightness of the light source can also be controlled in the area,
There is an effect that an image with a sense of contrast can be created.
【図１】本発明の実施の形態の液晶表示装置のブロック
構成図である。FIG. 1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention.
【図２】アナログによる分割方式を用いた本発明の実施
の形態の液晶表示装置のブロック構成図である。FIG. 2 is a block diagram of a liquid crystal display device according to an embodiment of the present invention using an analog division method.
【図３】デジタルによる分割方式を用いた本発明の実施
の形態の液晶表示装置のブロック構成図である。FIG. 3 is a block diagram of a liquid crystal display device according to an embodiment of the present invention using a digital division method.
【図４】本発明の実施の形態の液晶表示装置で実際に蛍
光管が制御されている状態を示す液晶ディスプレイの模
式図である。FIG. 4 is a schematic diagram of a liquid crystal display showing a state where a fluorescent tube is actually controlled in the liquid crystal display device according to the embodiment of the present invention.
１０１、２０１、３０１ アンテナ １０２、２０２、３０２ 復調回路 １０３ 分割回路 １０４、２０４、３０４ ＡＰＬ検出回路 １０５、２０５、３０５、４０５ インバータ制御回
路 １０６、２０６、３０６ 光源 １０７、２０７、３０７ 液晶表示回路 １０８、２０８、３０８、４０８ 液晶ディスプレイ １０９、２０９、３０９、４０９ 信号処理回路 ２１０ ブランキング回路 ３１１ Ａ／Ｄ変換回路 ３１２ メモリ ４０６ａ〜４０６ｄ 蛍光管101, 201, 301 Antenna 102, 202, 302 Demodulation circuit 103 Dividing circuit 104, 204, 304 APL detection circuit 105, 205, 305, 405 Inverter control circuit 106, 206, 306 Light source 107, 207, 307 Liquid crystal display circuit 108, 208, 308, 408 Liquid crystal display 109, 209, 309, 409 Signal processing circuit 210 Blanking circuit 311 A / D conversion circuit 312 Memory 406a-406d Fluorescent tube
フロントページの続き Ｆターム(参考） 2H091 FA23Z FA42Z FA44Z FD22 GA11 LA18 5C006 AA01 AA22 AF52 AF54 AF63 AF71 AF81 BB11 BB29 BF38 EA01 FA16 FA54 5C080 AA06 AA10 BB05 CC03 DD03 EE28 GG08 JJ02 5G435 AA03 BB12 EE30 GG25 Continued on the front page F-term (reference) 2H091 FA23Z FA42Z FA44Z FD22 GA11 LA18 5C006 AA01 AA22 AF52 AF54 AF63 AF71 AF81 BB11 BB29 BF38 EA01 FA16 FA54 5C080 AA06 AA10 BB05 CC03 DD03 EE28 GG08 JJ02 GG25 AE03
Claims (11)
た液晶表示装置であって、該液晶表示装置は、 画像を表示する液晶ディスプレイと、 液晶ディスプレイを背面から照射する複数の光源を有す
るバックライトと、 入力した前記ビデオ信号の映像信号を前記光源の配置に
対応した複数の映像領域に分割する分割回路と、 前記映像領域ごとに分割された映像信号のそれぞれの平
均輝度を検出するＡＰＬ（平均輝度）検出回路と、 各前記映像領域の映像信号の平均輝度の検出結果および
映像領域のそれぞれの相関に応じて、各前記映像領域の
ゲインを調整するための演算を行う信号処理回路と、 前記信号処理回路の演算結果に基づいて、それぞれの前
記光源の駆動用インバータのデューティー比を制御する
インバータ制御回路と、 前記復調回路から出力された映像信号を前記液晶ディス
プレイに画像表示するために必要なタイミングパルスを
生成し、ＲＧＢの映像信号とタイミングパルスとを液晶
ディスプレイへ出力する液晶表示回路と、を備えること
を特徴とする液晶表示装置。1. A liquid crystal display device comprising a backlight having a plurality of light sources, the liquid crystal display device comprising: a liquid crystal display for displaying an image; and a backlight having a plurality of light sources for illuminating the liquid crystal display from behind. A dividing circuit for dividing a video signal of the input video signal into a plurality of video areas corresponding to the arrangement of the light sources; and an APL (average) for detecting an average luminance of each of the video signals divided for each video area. A signal processing circuit that performs an operation for adjusting a gain of each of the video regions in accordance with a detection result of an average luminance of a video signal of each of the video regions and a correlation of each of the video regions; An inverter control circuit that controls a duty ratio of a driving inverter for each of the light sources based on a calculation result of the signal processing circuit; A liquid crystal display circuit that generates a timing pulse necessary to display a video signal output from a road on the liquid crystal display as an image, and outputs an RGB video signal and a timing pulse to the liquid crystal display. Liquid crystal display device.
た複数のブランキング回路を有し、前記ＡＰＬ検出回路
は前記複数の領域に対応して複数に分割され、 それぞれの前記ブランキング回路には、前記復調回路か
ら入力する前記ビデオ信号の映像信号が前記複数の領域
に対応した複数の映像領域に分割されて並列に入力さ
れ、 それぞれの分割された前記ＡＰＬ検出回路には、対応す
るブランキング回路より分割された映像信号が入力して
それぞれの平均輝度が検出される、請求項１に記載の液
晶表示装置。2. The method according to claim 1, wherein the dividing circuit has a plurality of blanking circuits corresponding to the plurality of areas, and the APL detecting circuit is divided into a plurality of sections corresponding to the plurality of areas. The video signal of the video signal input from the demodulation circuit is divided into a plurality of video areas corresponding to the plurality of areas and input in parallel, and each of the divided APL detection circuits has a corresponding block. 2. The liquid crystal display device according to claim 1, wherein the divided video signals are input from the ranking circuit and the respective average luminances are detected.
に変換するＡ／Ｄ変換回路と、デジタル化された映像信
号を記憶するメモリとを備え、 前記信号処理回路は、メモリから入力したデジタル化さ
れた映像信号を前記複数の領域に対応した複数の映像領
域に分割して前記ＡＰＬ検出回路に出力する、請求項１
に記載の液晶表示装置。3. The signal processing circuit according to claim 1, wherein the dividing circuit includes an A / D conversion circuit that converts the video signal into a digital signal, and a memory that stores the digitized video signal. The divided video signal is divided into a plurality of video areas corresponding to the plurality of areas and output to the APL detection circuit.
3. The liquid crystal display device according to 1.
ＡＰＬ検出回路とが、前記信号処理回路と一体の構成と
なっている請求項３に記載の液晶表示装置。4. The liquid crystal display device according to claim 3, wherein said A / D conversion circuit, said memory, and said APL detection circuit are integrated with said signal processing circuit.
の液晶表示装置。5. The liquid crystal display according to claim 1, wherein the light source is a fluorescent tube.
ネルである請求項１に記載の液晶表示装置。6. The liquid crystal display device according to claim 1, wherein said light source is an electroluminescence panel.
に配置され、照射光が導光板で前記液晶ディスプレイの
それぞれの分担領域に導光されているエッジライト方式
の構成である請求項１に記載の液晶表示装置。7. The edge light type configuration according to claim 1, wherein the light source is disposed around the liquid crystal display, and irradiation light is guided to respective shared areas of the liquid crystal display by a light guide plate. Liquid crystal display.
れぞれの分担領域に直接配置されている直下方式の構成
である請求項１に記載の液晶表示装置。8. The liquid crystal display device according to claim 1, wherein the light source has a direct type configuration in which the light sources are directly arranged on respective lower areas of the liquid crystal display.
と、を有する請求項１から請求項８のいずれか１項に記
載の液晶表示装置。9. The liquid crystal display device according to claim 1, further comprising: an antenna for receiving a broadcast wave; and a demodulation circuit for converting the received broadcast wave into a video signal.
えた液晶表示装置のバックライト輝度調整方法であっ
て、 入力した映像信号を、前記バックライトの前記光源の配
置に応じて複数の領域に分割し、 分割された映像信号のそれぞれの平均輝度（ＡＰＬ）を
検出し、 検出されたそれぞれの領域の平均輝度と領域のそれぞれ
の相関とに応じて、望ましい各領域のゲインを演算し、 演算されたゲインにより前記光源駆動用のインバータの
デューティー比を制御してそれぞれの前記光源の明るさ
を調整する、ことを特徴とする液晶表示装置のバックラ
イト輝度調整方法。10. A backlight brightness adjusting method for a liquid crystal display device provided with a backlight having a plurality of light sources, wherein an input video signal is divided into a plurality of regions according to the arrangement of the light sources of the backlight. Then, an average luminance (APL) of each of the divided video signals is detected, and a desired gain of each area is calculated in accordance with the average luminance of each of the detected areas and the correlation of each area. Controlling the duty ratio of the inverter for driving the light source by the gain to adjust the brightness of each of the light sources.
た放送波をビデオ信号に復調し、復調されたビデオ信号
に含まれる映像信号である請求項１０に記載の液晶表示
装置のバックライト輝度調整方法。11. The backlight luminance adjustment of the liquid crystal display device according to claim 10, wherein the video signal is a video signal obtained by demodulating a broadcast wave received by an antenna into a video signal and being included in the demodulated video signal. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12883799A JP3766231B2 (en) | 1999-05-10 | 1999-05-10 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12883799A JP3766231B2 (en) | 1999-05-10 | 1999-05-10 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000321571A true JP2000321571A (en) | 2000-11-24 |
| JP3766231B2 JP3766231B2 (en) | 2006-04-12 |
Family
ID=14994634
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12883799A Expired - Lifetime JP3766231B2 (en) | 1999-05-10 | 1999-05-10 | Liquid crystal display |
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