JP2002014660A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JP2002014660A
JP2002014660A JP2000195979A JP2000195979A JP2002014660A JP 2002014660 A JP2002014660 A JP 2002014660A JP 2000195979 A JP2000195979 A JP 2000195979A JP 2000195979 A JP2000195979 A JP 2000195979A JP 2002014660 A JP2002014660 A JP 2002014660A
Authority
JP
Japan
Prior art keywords
brightness
luminance
backlight
video signal
control
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
Application number
JP2000195979A
Other languages
Japanese (ja)
Inventor
Shigeo Ozaki
重夫 尾崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP2000195979A priority Critical patent/JP2002014660A/en
Publication of JP2002014660A publication Critical patent/JP2002014660A/en
Pending legal-status Critical Current

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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of individually and independently controlling the contrast and brightness of a video signal and the brightness of plural backlight with accuracy correspondingly to the brightness signal and brightness distribution of a very small area, and capable of realizing the expansion of the dynamic range of a video signal and the decrease of the power consumption. SOLUTION: Brightness distribution filters 7A, 7B correspond to two pieces of backlight 6A, 6B. Brightness distribution extracting circuits 8A, 8B determine an area occupying ratio for every brightness level of one field or one frame of an input video signal, and supply it to a control circuit 9. The control circuit 9 calculates a picture control variable from this area duty factor at each brightness level and controls contrast and brightness in a picture quality control circuit 3, and also simultaneously performs brightness control operation of the backlight 6A, 6B.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、液晶表示装置に係
わるものであり、特に映像信号の輝度レベルに応じて映
像のコントラストや輝度及びバックライトの輝度を制御
する液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device for controlling the contrast and brightness of an image and the brightness of a backlight according to the brightness level of an image signal.

【０００２】[0002]

【従来の技術】近年、液晶表示装置が、その省スペース
性等の特徴により、ＣＲＴ(Cathode Ray Tube)に代わ
り、ディスプレイ装置として多用されるようになってき
た。しかし、液晶表示装置は、最大輝度やコントラスト
比等の性能面で未だＣＲＴに及ばず、改善が続けられて
いる。例えば、「日経エレクトロニクス」１９９９年１
１月１５日号,no.757,pp.139-146に記載の「光源の輝度
を制御し、液晶パネルを高画質に」がある。以下、この
従来例につき、簡単に説明する。2. Description of the Related Art In recent years, a liquid crystal display device has been widely used as a display device instead of a CRT (Cathode Ray Tube) due to its features such as space saving. However, the performance of the liquid crystal display device, such as the maximum luminance and the contrast ratio, has not yet reached the level of the CRT and has been continuously improved. For example, "Nikkei Electronics"
There is "Controlling the Brightness of Light Sources and Making Liquid Crystal Panels High Image Quality" described in the January 15, issue, No. 757, pp. 139-146. Hereinafter, this conventional example will be briefly described.

【０００３】図６は従来例の液晶表示装置を示すブロッ
ク図である。図６において、入力映像信号は、入力端子
１より入力し、輝度検知回路２及び画質制御回路３へ供
給されている。輝度検知回路２は、入力映像信号の１フ
ィールド又は１フレームの画面毎の、輝度の最大値,最
小値,平均値を求め、制御回路４へ供給している。制御
回路４は、マイコン等で構成され、この輝度の最大値,
最小値,平均値の３個のパラメーターから、画質制御量
計算を行い画質制御回路３におけるコントラスト及び輝
度等の画質制御をすると共に、同時にバックライト６の
輝度制御動作も行っている。バックライトの輝度制御動
作は、前記の画質制御量計算に対応して、バックライト
の輝度制御量を求め、インバータ５を介してバックライ
ト６の輝度を制御している。要するに、映像信号のコン
トラストや輝度の制御と連動して、バックライトの輝度
を制御する事により、「黒浮き」等の問題を解決して高
画質を実現し、消費電力も削減するというものである。FIG. 6 is a block diagram showing a conventional liquid crystal display device. 6, an input video signal is input from an input terminal 1 and supplied to a luminance detection circuit 2 and an image quality control circuit 3. The luminance detecting circuit 2 obtains the maximum value, the minimum value, and the average value of the luminance for each screen of one field or one frame of the input video signal, and supplies them to the control circuit 4. The control circuit 4 is constituted by a microcomputer or the like,
The image quality control amount is calculated from the three parameters of the minimum value and the average value, and the image quality control circuit 3 controls the image quality such as contrast and brightness, and at the same time, controls the brightness of the backlight 6. In the backlight brightness control operation, the backlight brightness control amount is obtained in accordance with the above-described image quality control amount calculation, and the brightness of the backlight 6 is controlled via the inverter 5. In short, by controlling the brightness of the backlight in conjunction with the control of the contrast and brightness of the video signal, it is possible to solve problems such as "floating black", achieve high image quality, and reduce power consumption. is there.

【０００４】[0004]

【発明が解決しようとする課題】前記説明した従来例に
おいては、映像信号の輝度検出が1フィールド又は１フ
レーム内での最大値、最小値、平均値のみであるので、
微少面積でも、白又は黒、或いは白黒両方の映像信号が
入っていると、面積や場所に関係なく認識し、誤補正す
る可能性や、平均値のみに判断が委ねられるようなケー
スがあり、微少面積の輝度信号の影響により、精度の良
い制御ができないという問題点かあった。本発明は、前
記課題を解決するためになされたものであり、映像信号
を複数のバックライトの輝度分布フィルタを通過させ、
1フィールド又は１フレーム内での各輝度レベル毎の面
積占有率に応じて制御することにより、微少面積の輝度
信号や輝度分布に対応して精度良く、映像信号のコント
ラストや輝度及び複数のバックライトの輝度を個別に独
立して制御することができ、映像のダイナミックレンジ
拡大と消費電力削減が実現できる液晶表示装置を提供す
ることを目的とする。In the conventional example described above, since the luminance detection of the video signal is only the maximum value, the minimum value and the average value in one field or one frame,
Even with a small area, if there is white or black, or both black and white video signals, it is recognized regardless of the area and location, there is a possibility of erroneous correction, there are cases where judgment is left only to the average value, There has been a problem that accurate control cannot be performed due to the influence of the luminance signal having a very small area. The present invention has been made in order to solve the above-described problem, and passes a video signal through a luminance distribution filter of a plurality of backlights.
By controlling in accordance with the area occupancy for each luminance level in one field or one frame, the contrast and luminance of the video signal and a plurality of backlights can be precisely controlled in accordance with the luminance signal and luminance distribution of a small area. It is an object of the present invention to provide a liquid crystal display device capable of individually and independently controlling the luminance of an image and realizing expansion of a dynamic range of an image and reduction of power consumption.

【０００５】[0005]

【課題を解決するための手段】以上の目的を達成するた
めに、複数のバックライトを配置した液晶表示装置にお
いて、前記複数のバックライトの輝度分布に対応した複
数の輝度分布フィルタと、前記複数の輝度分布フィルタ
を介して入力する入力映像信号の各輝度レベル毎の面積
占有率を求める複数の輝度分布抽出回路と、前記複数の
輝度分布抽出回路の出力信号である映像信号の各輝度レ
ベル毎の面積占有率を入力し、画質制御量計算を行い、
コントラスト補正量や輝度制御量及び前記複数のバック
ライトの輝度制御量を求める制御回路と、前記バックラ
イトの輝度制御量に基づき、前記複数のバックライトの
輝度を制御する複数のインバータと、前記コントラスト
補正量や輝度制御量に基づき、前記入力映像信号にコン
トラスト制御及び輝度制御等の画質制御をした映像出力
信号を得る画質制御回路とを備えたことを特徴とする液
晶表示装置を提供するものである。In order to achieve the above object, in a liquid crystal display device having a plurality of backlights arranged therein, a plurality of brightness distribution filters corresponding to the brightness distributions of the plurality of backlights, A plurality of luminance distribution extraction circuits for calculating an area occupancy for each luminance level of an input video signal input through a luminance distribution filter; and for each luminance level of a video signal which is an output signal of the plurality of luminance distribution extraction circuits. Enter the area occupancy of the
A control circuit for obtaining a contrast correction amount, a brightness control amount, and a brightness control amount of the plurality of backlights; a plurality of inverters for controlling brightness of the plurality of backlights based on the brightness control amount of the backlight; A liquid crystal display device comprising: an image quality control circuit that obtains an image output signal obtained by performing image control such as contrast control and luminance control on the input image signal based on a correction amount and a luminance control amount. is there.

【０００６】[0006]

【発明の実施の形態】図２は複数のバックライトの配置
を示す図である。図２において、液晶パネルの上側にバ
ックライト６Ａが、下側にバックライト６Ｂが配置され
ている。本発明は、この様に複数のバックライトが配置
された実施例について説明する。図１は本発明の実施例
を示すブロック図である。図１において、入力映像信号
は、入力端子１より入力し、輝度分布フィルタ７Ａ,輝
度分布フィルタ７Ｂ及び画質制御回路３へ供給されてい
る。輝度分布フィルタ７Ａ,輝度分布フィルタ７Ｂは、
図２における２個のバックライト６Ａ及び６Ｂに対応す
るためのものである。FIG. 2 is a diagram showing an arrangement of a plurality of backlights. In FIG. 2, a backlight 6A is disposed above the liquid crystal panel, and a backlight 6B is disposed below the liquid crystal panel. The present invention will be described with respect to an embodiment in which a plurality of backlights are arranged as described above. FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, an input video signal is input from an input terminal 1 and supplied to a luminance distribution filter 7A, a luminance distribution filter 7B, and an image quality control circuit 3. The luminance distribution filter 7A and the luminance distribution filter 7B
This is for dealing with the two backlights 6A and 6B in FIG.

【０００７】図３は輝度分布フィルタの特性を示す図で
ある。図３において、横軸は図２における液晶パネル上
の垂直位置を表し、左が上側、右が下側である。縦軸は
補正係数である。図中、Ａはバックライト６Ａに対応す
る輝度分布フィルタ７Ａの特性、Ｂはバックライト６Ｂ
に対応する輝度分布フィルタ７Ｂの特性である。FIG. 3 is a diagram showing characteristics of a luminance distribution filter. 3, the horizontal axis represents the vertical position on the liquid crystal panel in FIG. 2, and the left is the upper side and the right is the lower side. The vertical axis is the correction coefficient. In the figure, A is the characteristic of the luminance distribution filter 7A corresponding to the backlight 6A, and B is the backlight 6B
Is a characteristic of the luminance distribution filter 7B corresponding to.

【０００８】図１において、輝度分布フィルタ７Ａの出
力信号、即ちバックライト６Ａの輝度分布に対応した映
像信号は、輝度分布抽出回路８Ａへ供給されている。輝
度分布抽出回路８Ａは、入力映像信号の１フィールド又
は１フレームの各輝度レベル毎の輝度分布、即ち各輝度
レベル毎の面積占有率を求めて、制御回路９へ供給して
いる。同様に、輝度分布フィルタ７Ｂの出力信号、即ち
バックライト６Ｂの輝度分布に対応した映像信号は、輝
度分布抽出回路８Ｂへ供給されている。輝度分布抽出回
路８Ｂは、入力映像信号の１フィールド又は１フレーム
の各輝度レベル毎の輝度分布、即ち各輝度レベル毎の面
積占有率を求めて、制御回路９へ供給している。輝度レ
ベルは、要求性能に応じて輝度レベルの高いＳ１から低
いＳｎまでのｎ段階に分けている。In FIG. 1, an output signal of the luminance distribution filter 7A, that is, a video signal corresponding to the luminance distribution of the backlight 6A is supplied to a luminance distribution extracting circuit 8A. The luminance distribution extraction circuit 8A obtains a luminance distribution for each luminance level of one field or one frame of the input video signal, that is, an area occupancy for each luminance level, and supplies the control circuit 9 with the luminance distribution. Similarly, the output signal of the luminance distribution filter 7B, that is, the video signal corresponding to the luminance distribution of the backlight 6B is supplied to the luminance distribution extraction circuit 8B. The luminance distribution extraction circuit 8B obtains a luminance distribution for each luminance level of one field or one frame of the input video signal, that is, an area occupancy for each luminance level, and supplies the obtained luminance to the control circuit 9. The luminance level is divided into n stages from high luminance level S1 to low luminance level Sn according to the required performance.

【０００９】制御回路９は、マイコン等で構成され、こ
の各輝度レベル毎の面積占有率から、画質制御量計算を
行い画質制御回路３におけるコントラスト及び輝度を制
御すると共に、同時にバックライト６Ａ及び６Ｂの輝度
制御動作も行っている。バックライトの輝度制御動作
は、前記の画質制御量計算に対応して、各々のバックラ
イトの輝度制御量を求め、インバータ５Ａ,５Ｂを介し
てバックライト６Ａ,６Ｂの輝度を独立に制御してい
る。要するに、映像信号のコントラストや輝度の制御と
連動して、バックライト６Ａ,６Ｂの輝度を制御するこ
とにより、従来例と同様に、「黒浮き」等の問題を解決
して高画質を実現し、消費電力も削減している。The control circuit 9 is composed of a microcomputer or the like, calculates the image quality control amount from the area occupancy for each brightness level, controls the contrast and the brightness in the image quality control circuit 3, and simultaneously controls the backlights 6A and 6B. Is also performed. In the backlight brightness control operation, the brightness control amounts of the respective backlights are obtained in accordance with the above-described image quality control amount calculation, and the brightness of the backlights 6A and 6B are independently controlled via the inverters 5A and 5B. I have. In short, by controlling the brightness of the backlights 6A and 6B in conjunction with the control of the contrast and the brightness of the video signal, it is possible to solve the problem of "floating black" and achieve a high image quality as in the conventional example. , Power consumption has also been reduced.

【００１０】以下、本発明の特徴である制御回路９にお
ける各輝度レベル毎の面積占有率によるバックライト輝
度制御について説明する。図４は本発明のバックライト
輝度制御特性を示す図である。図４において、横軸は各
輝度レベル毎の面積占有率(％)を表し、縦軸はバックラ
イト輝度(％)を表している。最上位の輝度レベルである
Ｓ１では、１フィールド又は１フレーム内の面積占有率
が少なくなってきてから、バックライト輝度を減少させ
る方向で、制御をスタートし、１フィールド又は１フレ
ーム内の面積占有率に応じて、バックライト輝度を可変
させる。ある一定の微少面積以下になると次の輝度レベ
ルへ移行し、そこで、再び１フィールド又は１フレーム
内の面積占有率に応じて、バックライト輝度を制御し、
ある一定の微少面積以下になると次の低い輝度レベルへ
と移行し、全ての輝度レベルに対しての制御を完了す
る。ここで、輝度分布フィルタを通っているために、各
々のバックライトを輝度分布に対応して個別に独立して
制御できることが特徴である。Hereinafter, the backlight luminance control based on the area occupancy for each luminance level in the control circuit 9 which is a feature of the present invention will be described. FIG. 4 is a diagram showing a backlight luminance control characteristic of the present invention. In FIG. 4, the horizontal axis represents the area occupancy (%) for each luminance level, and the vertical axis represents the backlight luminance (%). At S1, which is the highest luminance level, after the area occupancy rate in one field or one frame is reduced, control is started in the direction of decreasing the backlight luminance, and the area occupancy in one field or one frame is reduced. The backlight brightness is varied according to the rate. When the area becomes equal to or less than a certain small area, the display shifts to the next luminance level, and the backlight luminance is controlled again according to the area occupancy in one field or one frame,
When the area becomes smaller than a certain small area, the process shifts to the next lower luminance level, and the control for all the luminance levels is completed. Here, since the light passes through the luminance distribution filter, each backlight can be individually and independently controlled corresponding to the luminance distribution.

【００１１】以下、本発明の特徴である制御回路９にお
ける各輝度レベル毎の面積占有率によるコントラスト制
御について説明する。図５は本発明のコントラスト制御
特性を示す図である。図５において、横軸は各輝度レベ
ル毎の面積占有率(％)を表し、縦軸はコントラスト補正
量(％)を表している。最上位の輝度レベルであるＳ１で
は、あまりコントラスト補正は行わず、図４のバックラ
イト輝度制御と連動して、バックライト輝度を下げた輝
度レベルほど、コントラスト補正量を増加させる様に制
御し、見かけ上のコントラストを維持することにより、
暗いシーンでの液晶表示装置特有の黒浮きを抑え、映像
のダイナミックレンジを拡大している。このコントラス
ト制御と、バックライト輝度制御は、１フィールド又は
１フレーム周期で同期して行われる。Hereinafter, the contrast control by the area occupancy for each luminance level in the control circuit 9 which is a feature of the present invention will be described. FIG. 5 is a diagram showing the contrast control characteristics of the present invention. In FIG. 5, the horizontal axis represents the area occupancy (%) for each luminance level, and the vertical axis represents the contrast correction amount (%). At S1, which is the highest luminance level, contrast correction is not performed so much, and in conjunction with the backlight luminance control of FIG. 4, control is performed so that the contrast correction amount increases as the luminance level decreases. By maintaining the apparent contrast,
The black floating characteristic of liquid crystal display devices in dark scenes is suppressed, and the dynamic range of images is expanded. The contrast control and the backlight luminance control are performed in synchronization with one field or one frame period.

【００１２】なお、以上説明では、制御回路９における
コントラスト制御についてのみ説明したが、同時に制御
回路９は画質制御回路３における輝度制御も行っている
が、その動作はコントラスト制御と似た点もあるので、
詳細な説明は省略する。又、本実施例では、バックライ
トが２個の場合について説明したが、３個以上の複数の
場合にも、同様に輝度分布フィルタ及び輝度分布抽出回
路を追加すれば良いことは勿論である。In the above description, only the contrast control in the control circuit 9 has been described. At the same time, the control circuit 9 also performs the brightness control in the image quality control circuit 3, but the operation is similar to the contrast control. So
Detailed description is omitted. In the present embodiment, the case where the number of backlights is two has been described. However, it is needless to say that a brightness distribution filter and a brightness distribution extraction circuit may be similarly added to a case where there are three or more backlights.

【００１３】[0013]

【発明の効果】本発明の液晶表示装置は、映像信号を複
数のバックライトの輝度分布フィルタを通過させ、1フ
ィールド又は１フレーム内での各輝度レベル毎の面積占
有率に応じて制御することにより、微少面積の輝度信号
や輝度分布に対応して精度良く、映像信号のコントラス
トや輝度及び複数のバックライトの輝度を個別に独立し
て制御することができ、映像のダイナミックレンジ拡大
と消費電力削減が実現できるという極めて優れた効果が
ある。According to the liquid crystal display device of the present invention, a video signal is passed through a luminance distribution filter of a plurality of backlights, and is controlled in accordance with an area occupancy for each luminance level in one field or one frame. This allows the contrast and brightness of video signals and the brightness of multiple backlights to be controlled individually and independently with high accuracy in response to the luminance signal and the luminance distribution in a very small area. There is an extremely excellent effect that reduction can be realized.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施例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】複数のバックライトの配置を示す図である。FIG. 2 is a diagram showing an arrangement of a plurality of backlights.

【図３】輝度分布フィルタの特性を示す図である。FIG. 3 is a diagram illustrating characteristics of a luminance distribution filter.

【図４】本発明のバックライト輝度制御特性を示す図で
ある。FIG. 4 is a diagram showing a backlight luminance control characteristic of the present invention.

【図５】本発明のコントラスト制御特性を示す図であ
る。FIG. 5 is a diagram showing contrast control characteristics of the present invention.

【図６】従来例の液晶表示装置を示すブロック図であ
る。FIG. 6 is a block diagram showing a conventional liquid crystal display device.

【符号の説明】[Explanation of symbols]

１ 入力端子 ３ 画質制御回路 ５Ａ,５Ｂ インバータ ６Ａ,６Ｂ バックライト ７Ａ,７Ｂ 輝度分布フィルタ ８Ａ,８Ｂ 輝度分布抽出回路 ９ 制御回路 DESCRIPTION OF SYMBOLS 1 Input terminal 3 Picture quality control circuit 5A, 5B Inverter 6A, 6B Backlight 7A, 7B Luminance distribution filter 8A, 8B Luminance distribution extraction circuit 9 Control circuit

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H093 NC21 NC44 NC49 NC62 NC66 ND03 ND07 ND39 NE06 5C006 AA01 AF46 AF63 AF69 BB11 BB29 BF15 BF21 EA01 FA21 FA47 FA54 5C080 AA10 BB05 DD03 DD26 EE28 FF03 GG07 GG08 JJ02 JJ04 JJ05  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H093 NC21 NC44 NC49 NC62 NC66 ND03 ND07 ND39 NE06 5C006 AA01 AF46 AF63 AF69 BB11 BB29 BF15 BF21 EA01 FA21 FA47 FA54 5C080 AA10 BB05 DD03 DD26 EE28 FF03 GG07 GG04 JJ07 JJ

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】複数のバックライトを配置した液晶表示装
置において、 前記複数のバックライトの輝度分布に対応した複数の輝
度分布フィルタと、 前記複数の輝度分布フィルタを介して入力する入力映像
信号の各輝度レベル毎の面積占有率を求める複数の輝度
分布抽出回路と、 前記複数の輝度分布抽出回路の出力信号である映像信号
の各輝度レベル毎の面積占有率を入力し、画質制御量計
算を行い、コントラスト補正量や輝度制御量及び前記複
数のバックライトの輝度制御量を求める制御回路と、 前記バックライトの輝度制御量に基づき、前記複数のバ
ックライトの輝度を制御する複数のインバータと、 前記コントラスト補正量や輝度制御量に基づき、前記入
力映像信号にコントラスト制御及び輝度制御等の画質制
御をした映像出力信号を得る画質制御回路とを備えたこ
とを特徴とする液晶表示装置。1. A liquid crystal display device in which a plurality of backlights are arranged, a plurality of brightness distribution filters corresponding to the brightness distributions of the plurality of backlights, and an input video signal input through the plurality of brightness distribution filters. A plurality of luminance distribution extraction circuits for obtaining an area occupancy for each luminance level; and an area occupancy for each luminance level of a video signal which is an output signal of the plurality of luminance distribution extraction circuits. A control circuit for performing a contrast correction amount, a brightness control amount, and a brightness control amount of the plurality of backlights, and a plurality of inverters for controlling the brightness of the plurality of backlights based on the brightness control amount of the backlight, On the basis of the contrast correction amount and the brightness control amount, the input video signal is provided with a video output signal obtained by performing image quality control such as contrast control and brightness control. The liquid crystal display device characterized by comprising a that picture quality controller.
JP2000195979A 2000-06-29 2000-06-29 Liquid crystal display device Pending JP2002014660A (en)

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Family

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Application Number Title Priority Date Filing Date
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Country Link
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