JP2002140038A - Transmission type image display device - Google Patents

Transmission type image display device

Info

Publication number
JP2002140038A
JP2002140038A JP2000336453A JP2000336453A JP2002140038A JP 2002140038 A JP2002140038 A JP 2002140038A JP 2000336453 A JP2000336453 A JP 2000336453A JP 2000336453 A JP2000336453 A JP 2000336453A JP 2002140038 A JP2002140038 A JP 2002140038A
Authority
JP
Japan
Prior art keywords
color
light source
light
display device
shutter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2000336453A
Other languages
Japanese (ja)
Other versions
JP4594510B2 (en
Inventor
Kazuhiro Ishiguchi
和博 石口
Moriyoshi Takahashi
盛毅 高橋
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.)
Advanced Display Inc
Original Assignee
Advanced Display Inc
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 Advanced Display Inc filed Critical Advanced Display Inc
Priority to JP2000336453A priority Critical patent/JP4594510B2/en
Publication of JP2002140038A publication Critical patent/JP2002140038A/en
Application granted granted Critical
Publication of JP4594510B2 publication Critical patent/JP4594510B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a transmission type image display device which has a wide color reproduction range. SOLUTION: This device is provided with light sources which have different light emission colors, a light source control part which can control those light sources independently, an image detection part which computes and sends an input image signal to the light source control part, a shutter part equipped with color filters of different colors, and a shutter control part which controls the shutter part; and the input image signal is dynamically computed and the light emission rate of the light sources which emit lights at the same time is varied.

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、表示画素ごとに複
数色の色フィルタを有することにより、カラー画像を表
示する透過型画像表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type image display device which displays a color image by providing a plurality of color filters for each display pixel.

【０００２】[0002]

【従来の技術】図６に示すように、透過型画像表示装置
は、一般的に、光源１と、画像を生成するためのシャッ
タ２、およびシャッタ２を制御するシャッタ制御部３か
ら構成されている。シャッタ２は、表示画像を構成する
各画素に対応して微細領域ごとに開閉が可能であり、各
画素における光の透過率を制御することにより表示画像
を得ている。2. Description of the Related Art As shown in FIG. 6, a transmission type image display device generally comprises a light source 1, a shutter 2 for generating an image, and a shutter control unit 3 for controlling the shutter 2. I have. The shutter 2 can be opened and closed for each fine region corresponding to each pixel constituting a display image, and obtains a display image by controlling the light transmittance of each pixel.

【０００３】カラー表示を行なう透過型画像表示装置の
場合には、図５に示すように、各画素をさらにＲＧＢの
三色の色フィルタ７に対応してサブ画素に分割し、シャ
ッタ２によって各サブ画素における光の透過率を制御す
る。各サブ画素および各画素は充分微細に作り込まれて
いるため、各サブ画素に表示されるＲＧＢ三色の混合色
が、画素の表示色として表示装置の使用者に観察され
る。In the case of a transmissive image display device for performing color display, as shown in FIG. 5, each pixel is further divided into sub-pixels corresponding to three color filters 7 of RGB. The light transmittance of the sub-pixel is controlled. Since each sub-pixel and each pixel are sufficiently finely formed, a user of the display device observes a mixed color of three colors of RGB displayed on each sub-pixel as a display color of the pixel.

【０００４】従来の透過型画像表示装置においては、前
記三色の色フィルタ７およびシャッタ２に、単一色の光
源１を組み合わせてカラー表示を行なう。ゆえに、表示
することのできる色再現範囲は、色フィルター特性と光
源の発光色とに依存し、たとえば図４の色度図における
領域１００の内側に限られ、常に一定であってその範囲
も狭い。したがって、従来の透過型画像表示装置におい
ては、彩度の高い表示を得ることが困難であった。In a conventional transmissive image display apparatus, a color display is performed by combining the three color filters 7 and the shutter 2 with the light source 1 of a single color. Therefore, the color reproduction range that can be displayed depends on the color filter characteristics and the emission color of the light source, and is limited, for example, inside the area 100 in the chromaticity diagram of FIG. 4, and is always constant and narrow. . Therefore, it has been difficult to obtain a display with high saturation in the conventional transmission type image display device.

【０００５】色変換演算部８を設けて入力画像信号を演
算により変換し、より彩度の高い色として表示すること
により、見かけ上色を鮮やかにする手法も考えられてい
るが、実際に表示可能な色再現範囲は図４の色度図にお
ける領域１００のまま一定であるために、高彩度側で飽
和による色潰れが生じる。There has been proposed a method of providing a color conversion operation section 8 to convert an input image signal by operation and displaying the input image signal as a color having higher saturation, so that the apparent color becomes vivid. Since the possible color reproduction range remains constant in the region 100 in the chromaticity diagram of FIG. 4, color crushing occurs due to saturation on the high chroma side.

【０００６】[0006]

【発明が解決しようとする課題】従来の、各画素ごとに
色フィルタを備えた透過型画像表示装置では、画像は、
光源の色と、色フィルタで決定される色再現範囲内で表
示される。一般に液晶表示装置などの透過型画像表示装
置では、この色再現範囲はＣＲＴなどの表示装置と比べ
て狭く、通常のＴＶ画面などを表示した場合、鮮やかさ
において見劣りしてしまう欠点があった。In a conventional transmission-type image display device having a color filter for each pixel, an image is
The image is displayed within the color reproduction range determined by the color of the light source and the color filter. Generally, in a transmissive image display device such as a liquid crystal display device, this color reproduction range is narrower than that of a display device such as a CRT, and there is a disadvantage that when a normal TV screen or the like is displayed, the vividness is inferior.

【０００７】また、入力画像信号を演算により変換し
て、見かけ上色を鮮やかにする手法では、実際の表示可
能な色再現範囲は一定であるために、強調された色が飽
和により色潰れを起こす欠点があった。Further, in the method of converting an input image signal by operation to make the apparent color vivid, since the actual displayable color reproduction range is constant, the emphasized color may be crushed due to saturation. There was a drawback to cause.

【０００８】本発明では、入力画像に応じて動的に特定
の色を鮮やかにし、動画表示の際に、ＣＲＴなどの表示
装置と同等の色再現範囲を、違和感なく実現する方法を
提供する。The present invention provides a method for dynamically increasing a specific color according to an input image and realizing a color reproduction range equivalent to that of a display device such as a CRT at the time of displaying a moving image without discomfort.

【０００９】[0009]

【課題を解決するための手段】本発明の透過型画像表示
装置は、発光色の異なる複数の光源と、これら各光源を
独立に制御することができる光源制御部と、入力画像信
号を演算して光源制御部に信号を送る画像検出部と、複
数の色からなる色フィルターを備えたシャッタ部と、シ
ャッタ部を制御するためのシャッタ制御部とを有し、シ
ャッタ部の光透過率を制御することにより画像の表示を
行なう透過型画像表示装置であって、入力画像信号を動
的に演算して、同時に発光している前記各光源の発光比
率を変化させることにより、表示画像の色再現範囲を変
化させ特定の色をより鮮やかに強調表示させることを可
能にしたことを特徴とする。According to the present invention, there is provided a transmission type image display apparatus which calculates a plurality of light sources having different emission colors, a light source control section which can independently control each of these light sources, and an input image signal. An image detection unit for sending a signal to the light source control unit, a shutter unit having a color filter composed of a plurality of colors, and a shutter control unit for controlling the shutter unit, and controlling the light transmittance of the shutter unit. A transmission type image display device that displays an image by dynamically calculating an input image signal and changing a light emission ratio of each of the light sources that emit light at the same time. The present invention is characterized in that a specific color can be highlighted more vividly by changing the range.

【００１０】また、光源の発光比率を変化させたことに
よって、前記特定の色以外の色が変化することを抑える
ために、入力画像信号を補正してシャッタ制御部に入力
する色補正演算部を備えたことを特徴とする。Further, in order to prevent a color other than the specific color from changing due to a change in the light emission ratio of the light source, a color correction operation unit for correcting an input image signal and inputting the corrected image signal to a shutter control unit is provided. It is characterized by having.

【００１１】さらに、前記光源の発光比率の変化および
前記入力画像信号の補正を行なう際に、白色輝度を変化
させないために光源全体の発光量を制御することを特徴
とする。Further, when the change of the light emission ratio of the light source and the correction of the input image signal are performed, the light emission amount of the entire light source is controlled so as not to change the white luminance.

【００１２】[0012]

【発明の実施の形態】実施の形態１ 図１に、本実施の形態による透過型画像表示装置のブロ
ック図を示す。本実施の形態における透過型画像表示装
置は、発光色の異なる複数種類の光源１ａ、１ｂ、１
ｃ、・・・、およびこれら各光源の発光を制御する光源
制御部４、色フィルタを各画素に備えたシャッタ２およ
びシャッタ制御部３、さらに入力画像を検出する画像検
出部５から構成される。本実施の形態では、発光色がそ
れぞれ、Ｒ（赤）、Ｇ（緑）、Ｂ（青）である三種類の
光源を使用した。また、色フィルタは図５に示すＲＧＢ
ストライプ構成のものを使用し、シャッタとしてマトリ
クス方式のＴＦＴ液晶を用いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a block diagram of a transmission type image display device according to the present embodiment. The transmissive image display device according to the present embodiment includes a plurality of types of light sources 1a, 1b, 1
c,... and a light source control unit 4 for controlling light emission of each of these light sources, a shutter 2 and a shutter control unit 3 provided with a color filter for each pixel, and an image detection unit 5 for detecting an input image. . In the present embodiment, three types of light sources whose emission colors are R (red), G (green), and B (blue) are used, respectively. Also, the color filters are RGB shown in FIG.
A stripe type liquid crystal is used, and a matrix type TFT liquid crystal is used as a shutter.

【００１３】入力画像信号は、シャッタ制御部３に入力
され、シャッタ２を制御して表示画像を形成するととも
に、画像検出部５に入力される。画像検出部５では、１
フレームごとに、入力画像信号の強調色を検出する。た
とえば、画面上の各座標｛ｘ，ｙ｝について、入力画像
信号の各色のデータを｛Ｒx,y，Ｇx,y，Ｂx,y｝とし、
１フレーム期間にわたりThe input image signal is input to a shutter control unit 3, controls the shutter 2 to form a display image, and is also input to an image detection unit 5. In the image detection unit 5, 1
An enhanced color of the input image signal is detected for each frame. For example, for each coordinate {x, y} on the screen, the data of each color of the input image signal is {R x, y , G x, y , B x, y },
Over one frame period

【００１４】[0014]

【数１】 (Equation 1)

【００１５】を計算すると、これらの比率によりその１
フレームの画面でもっとも多く使われている色を検出す
ることができる。この検出結果を光源制御部４に送り、
色の異なる複数の光源１ａ、１ｂ、１ｃの発光比率を変
更し、特定の色をより鮮やかに強調する。発光比率の変
更は、各光源の発光量を変化させることによって行なっ
てもよいし、単位時間あたりに占める各光源の発光時間
の割合を変化させて行なってもよい。[0015] When the ratio is calculated, the ratio 1
The most frequently used colors on the frame screen can be detected. This detection result is sent to the light source control unit 4 and
By changing the light emission ratio of the plurality of light sources 1a, 1b, 1c having different colors, a specific color is emphasized more vividly. The change of the light emission ratio may be performed by changing the light emission amount of each light source, or may be performed by changing the ratio of the light emission time of each light source per unit time.

【００１６】画像検出部５での強調色の検出において
は、（式１）のようなデータの単純な和だけでなく、２
乗和であったり、その他の画像検出方式も使用できる。
また、このような演算を数フレームにわたって行ない、
数フレームの平均として強調色を検出してもよい。In the detection of the emphasized color by the image detecting section 5, not only the simple sum of the data as shown in (Equation 1) but also the 2
Sum of squares and other image detection schemes can be used.
Moreover, such an operation is performed over several frames,
The emphasized color may be detected as an average of several frames.

【００１７】この方式によれば、たとえば赤っぽい画面
では、赤い光源の発光比率を上げることにより、より赤
を強調した表示を得ることができる。すなわち、図４に
示す従来の色再現範囲内の座標１０１を、色度図上で特
定の色方向に関してより鮮やかな色に、つまり座標２０
１へと移動させることができる。According to this method, for example, on a reddish screen, a display in which red is emphasized can be obtained by increasing the emission ratio of the red light source. That is, the coordinates 101 in the conventional color reproduction range shown in FIG. 4 are changed to a more vivid color with respect to a specific color direction on the chromaticity diagram, that is, the coordinates 20.
1 can be moved.

【００１８】従来の入力信号を変換することによる色変
換技術では、色再現範囲そのものは変化せず領域１００
の内側に限られており、当然、変換後の表示色もこの領
域１００内に制限されてしまっていた。本実施の形態で
は、色再現範囲そのものを領域１００から領域２００へ
と変更することが可能であるため、より彩度の高い表示
を得ることができる。本実施の形態でも、実際には色再
現範囲は広がってはおらず、色再現範囲が移動するだけ
である。しかし、色再現範囲の移動が動的に、つまり色
再現範囲の移動方向および移動量の決定が入力画像信号
にもとづいて毎フレームごとに行なわれるため、表示画
像の観察者には実際の色再現範囲が広くなったように知
覚される。In the conventional color conversion technique by converting an input signal, the color gamut itself is not changed and the area 100 is not changed.
And, naturally, the converted display color is also limited within this area 100. In the present embodiment, since the color reproduction range itself can be changed from the region 100 to the region 200, a display with higher saturation can be obtained. Also in the present embodiment, the color gamut is not actually widened, only the color gamut moves. However, the movement of the color reproduction range is dynamic, that is, the direction and amount of movement of the color reproduction range are determined for each frame based on the input image signal. Perceived as widened.

【００１９】実施の形態２ 図２に、本発明の別の実施の形態における透過型画像表
示装置のブロック図を示す。本実施の形態における透過
型画像表示装置は、発光色の異なる複数種類の光源１
ａ、１ｂ、１ｃおよびこれら各光源の発光を制御する光
源制御部４、色フィルタを各画素に備えたシャッタ２お
よびシャッタ制御部３、入力画像を検出する画像検出部
５および色補正演算部６から構成される。Embodiment 2 FIG. 2 is a block diagram showing a transmission type image display device according to another embodiment of the present invention. The transmission-type image display device according to the present embodiment includes a plurality of types of light sources 1 having different emission colors.
a, 1b, 1c and a light source control unit 4 for controlling light emission of each light source; a shutter 2 and a shutter control unit 3 provided with a color filter for each pixel; an image detection unit 5 for detecting an input image; Consists of

【００２０】実施の形態１と同様に、画像検出部５にて
入力画像信号におけるＲＧＢ各色の割合を分析し、発光
比率信号を光源制御部４に送ることによって各光源１
ａ、１ｂ、１ｃの発光比率を変更する。同時に、発光比
率信号は色補正演算部６にも送られる。この色補正演算
部６では、画像検出部５により決定された光源の発光比
率に応じて、入力画像信号のうちの強調色以外について
色補正を行なう。As in the first embodiment, the image detecting unit 5 analyzes the ratio of each of the RGB colors in the input image signal, and sends a light emission ratio signal to the light source control unit 4 so that each light source 1
The light emission ratios of a, 1b, and 1c are changed. At the same time, the light emission ratio signal is also sent to the color correction calculation unit 6. The color correction calculation unit 6 performs color correction on the input image signal other than the emphasized color in accordance with the light emission ratio of the light source determined by the image detection unit 5.

【００２１】実施の形態１では、光源の発光比率を変更
することによって強調色の彩度を高めているため、強調
色以外の色の色度座標も同時に変化してしまう。本実施
の形態では、この色補正演算部６によって、シャッタ制
御部３に入力される信号を変換し、強調色以外の色変化
を防止することができる。この色補正演算部６での信号
の変換に、光源の発光比率および入力画像信号をパラメ
ータとするルックアップテーブルを使用することによ
り、精度よく色補正を行なうことができる。または、マ
トリクス演算により色補正を行なうことで、精度は若干
低下するものの、構成部品の点数を低減する効果があ
る。In the first embodiment, since the saturation of the emphasized color is increased by changing the light emission ratio of the light source, the chromaticity coordinates of colors other than the emphasized color also change. In the present embodiment, the signal input to the shutter control unit 3 can be converted by the color correction calculation unit 6 to prevent a change in color other than the emphasized color. By using a look-up table in which the light emission ratio of the light source and the input image signal are used as parameters for the signal conversion in the color correction calculation unit 6, color correction can be performed with high accuracy. Alternatively, by performing the color correction by the matrix operation, although the accuracy is slightly lowered, there is an effect of reducing the number of components.

【００２２】たとえば、図４において座標１０１にある
色をさらに赤っぽく強調する場合、実施の形態１と同様
に、光源の発光比率を変更することにより色再現範囲を
領域１００から領域２００へと移動させ、座標１０１を
座標２０１へと移動させることにより鮮やかな赤色を表
示することができる。しかし、このままでは白色の色度
座標も座標１０２から座標２０２へと移動し、赤みがか
った白色として表示されてしまう。For example, when the color at the coordinates 101 in FIG. 4 is to be further emphasized reddish, the color reproduction range is changed from the area 100 to the area 200 by changing the light emission ratio of the light source as in the first embodiment. By moving the coordinates 101 to the coordinates 201, a bright red color can be displayed. However, in this state, the chromaticity coordinates of the white color also move from the coordinate 102 to the coordinate 202, and are displayed as reddish white.

【００２３】そこで本実施の形態では、色補正演算部６
にて、変更後の光源の発光比率をもとに、強調色以外の
表示色について信号変換による色補正を行なう。たとえ
ば、赤色の光源の発光比率を高めた場合には、画像信号
のＲ（赤）の成分を減らす信号変換を行なう。また、Ｒ
（赤）の成分を減らすかわりに、Ｇ（緑）およびＢ
（青）の成分を増やしてもよい。Ｒ（赤）の成分を減ら
しつつ、Ｇ（緑）およびＢ（青）の成分を増やせば、全
体として輝度が変化することがなく好ましい。Therefore, in the present embodiment, the color correction operation unit 6
Then, based on the changed light emission ratio of the light source, color correction by signal conversion is performed for display colors other than the emphasized color. For example, when the emission ratio of the red light source is increased, signal conversion for reducing the R (red) component of the image signal is performed. Also, R
Instead of reducing the (red) component, G (green) and B
The component of (blue) may be increased. It is preferable to increase the components of G (green) and B (blue) while reducing the component of R (red) because the luminance does not change as a whole.

【００２４】以上述べたように、本実施の形態の透過型
画像表示装置では、強調色以外の表示色について信号変
換による色補正を行なうため、白色の色度座標が座標２
０２へと移動してしまうことはなく、元の座標１０２の
位置に表示される。したがって、強調色をより鮮やかに
表示し、かつ強調色以外の色変化を抑えることができ、
違和感のない自然な表示を得ることが可能である。As described above, in the transmission type image display apparatus of the present embodiment, since the color correction by the signal conversion is performed on the display colors other than the emphasized color, the chromaticity coordinates of the white color are the coordinates 2
It does not move to 02 and is displayed at the position of the original coordinates 102. Therefore, it is possible to display the emphasized color more vividly and to suppress a color change other than the emphasized color,
Natural display without discomfort can be obtained.

【００２５】実施の形態３ 図３に、本発明の他の実施の形態における透過型画像表
示装置のブロック図を示す。本実施の形態における透過
型画像表示装置は、発光色の異なる複数種類の光源１
ａ、１ｂ、１ｃおよびこれら各光源の発光を制御する光
源制御部４、色フィルタを各画素に備えたシャッタ２お
よびシャッタ制御部３、入力画像を検出する画像検出部
５および色補正演算部６から構成される。Embodiment 3 FIG. 3 shows a block diagram of a transmission type image display device according to another embodiment of the present invention. The transmission-type image display device according to the present embodiment includes a plurality of types of light sources 1 having different emission colors.
a, 1b, 1c and a light source control unit 4 for controlling light emission of each light source; a shutter 2 and a shutter control unit 3 provided with a color filter for each pixel; an image detection unit 5 for detecting an input image; Consists of

【００２６】実施の形態２と同様に、画像検出部５にて
入力画像信号におけるＲＧＢ各色の割合を分析し、発光
比率信号を光源制御部４に送ることによって各光源１
ａ、１ｂ、１ｃの発光比率を変更する。同時に、画像検
出部５により決定された各光源の発光比率に応じて、色
補正演算部６で入力画像信号のうちの強調色以外につい
ての色補正を行なう。さらに、本実施の形態では、色補
正演算部６から光源制御部４に、色補正にともなう白輝
度の変化情報を送り、光源全体の発光量を変化させるこ
とにより、白輝度の変化を抑える。As in the second embodiment, the image detector 5 analyzes the ratio of each of the RGB colors in the input image signal, and sends a light emission ratio signal to the light source controller 4 so that each light source 1
The light emission ratios of a, 1b, and 1c are changed. At the same time, in accordance with the light emission ratio of each light source determined by the image detection unit 5, the color correction calculation unit 6 performs color correction on the input image signal other than the emphasized color. Furthermore, in the present embodiment, a change in white luminance is sent from the color correction calculation unit 6 to the light source control unit 4 to change the amount of light emission of the entire light source by sending information on the change in white luminance.

【００２７】入力画像信号を変換して色補正を行なう場
合、最大階調の白色ではＲＧＢいずれかの透過率を減少
させなければならない。したがって、表示される色変換
後の白色は、暗くなってしまう。When performing color correction by converting an input image signal, it is necessary to reduce the transmittance of any of RGB for white of the maximum gradation. Therefore, the displayed white after the color conversion becomes dark.

【００２８】これを防ぐために、色補正演算部６から、
光源制御部４に白色輝度の変動分の信号を送り、白色輝
度が変化しないように制御する。たとえば、画像検出部
５からは、ＬR：ＬG：ＬB（ＬR，ＬG，ＬBはそれぞれ
Ｒ、Ｇ、Ｂの各光源の発光輝度）の割合を指定し、色補
正演算部６からはＬR＋ＬG＋ＬBの値を指定するとよ
い。To prevent this, the color correction calculation unit 6
A signal corresponding to the variation of the white luminance is sent to the light source control unit 4 to control the white luminance so as not to change. For example, from the image detection unit 5, L R: L G: L B (L R, L G, L B are respectively R, G, emission luminance of each light source of B) specifies the percentage of color correction arithmetic unit You may specify a value of L R + L G + L B from 6.

【００２９】たとえば、赤をより鮮やかに強調する場
合、白が赤の方向に移動しないように、白をシアン側に
色補正し、元の色度座標の位置に戻すような演算をす
る。白がシアン側に補正されると、実際にシャッタ制御
部３に入力される白画像信号は、赤の透過率が減じら
れ、そのままでは輝度の低下が生じる。本実施例では、
色補正演算部６から光源制御部３に白色輝度の変動分の
信号が送られ、光源全体の発光量が増加するので、元の
白色と同じ輝度にて表示を行なうことができる。また、
白に限らず強調色以外の他のほとんどの色についても、
基本的には色補正によってシャッタ部で赤の透過率を減
じるために、同様の輝度低下を生じる。そのため、本実
施の形態による白輝度補正の光源制御によって、白と同
様の輝度補正効果が得られる。さらに強調色について
は、色補正が行なわれないので、光源の発光量が増加す
る分輝度が増加し、より強調される効果がある。For example, when red is emphasized more vividly, an operation is performed such that white is corrected to the cyan side so that white does not move in the red direction, and the position is returned to the original chromaticity coordinate position. When the white color is corrected to the cyan side, the red transmittance of the white image signal actually input to the shutter control unit 3 is reduced, and the brightness is reduced as it is. In this embodiment,
A signal corresponding to a change in white luminance is sent from the color correction calculation unit 6 to the light source control unit 3 and the light emission amount of the entire light source increases, so that display can be performed with the same luminance as the original white. Also,
Not only white but also most other colors besides highlight colors,
Basically, a similar reduction in luminance occurs because the transmittance of red is reduced in the shutter section by color correction. Therefore, by the light source control of white luminance correction according to the present embodiment, a luminance correction effect similar to that of white can be obtained. Further, since the color correction is not performed for the emphasized color, the luminance is increased by the increase in the light emission amount of the light source, and there is an effect that the color is further emphasized.

【００３０】[0030]

【発明の効果】本発明によれば、色再現範囲が広く、鮮
やかな表示の透過型画像表示装置を提供することが可能
である。According to the present invention, it is possible to provide a transmissive image display device having a wide color reproduction range and vivid display.

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

【図１】本発明の実施の形態１による透過型画像表示装
置を説明するブロック図である。FIG. 1 is a block diagram illustrating a transmission type image display device according to a first embodiment of the present invention.

【図２】本発明の実施の形態２による透過型画像表示装
置を説明するブロック図である。FIG. 2 is a block diagram illustrating a transmission type image display device according to a second embodiment of the present invention.

【図３】本発明の実施の形態３による透過型画像表示装
置を説明するブロック図である。FIG. 3 is a block diagram illustrating a transmission type image display device according to a third embodiment of the present invention.

【図４】本発明の効果を説明するためのＣＩＥx,y色度
図である。FIG. 4 is a CIE x, y chromaticity diagram for explaining the effect of the present invention.

【図５】シャッタに備える色フィルタを示した図であ
る。FIG. 5 is a diagram showing a color filter provided in a shutter.

【図６】従来の透過型画像表示装置を説明するブロック
図である。FIG. 6 is a block diagram illustrating a conventional transmissive image display device.

【符号の説明】[Explanation of symbols]

１ａ、１ｂ、１ｃ 光源 ２ シャッタ ３ シャッタ制御部 ４ 光源制御部 ５ 画像検出部 ６ 色補正演算部 ７ 色フィルタ ８ 色変換演算部 １００ 従来の技術による色再現範囲 ２００ 本発明による色再現範囲 1a, 1b, 1c Light source 2 Shutter 3 Shutter control unit 4 Light source control unit 5 Image detection unit 6 Color correction operation unit 7 Color filter 8 Color conversion operation unit 100 Color reproduction range according to conventional technology 200 Color reproduction range according to the present invention

フロントページの続き Ｆターム(参考） 5C006 AA22 AF44 BB16 BC16 EA01 5C060 BA04 BA08 BA09 BB13 BC01 BD02 DA04 HD00 JA17 5C080 AA10 BB05 CC03 DD01 EE19 EE29 EE30 FF11 JJ02 JJ05Continued on the front page F term (reference) 5C006 AA22 AF44 BB16 BC16 EA01 5C060 BA04 BA08 BA09 BB13 BC01 BD02 DA04 HD00 JA17 5C080 AA10 BB05 CC03 DD01 EE19 EE29 EE30 FF11 JJ02 JJ05

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 発光色の異なる複数の光源と、これら各
光源を独立に制御することができる光源制御部と、入力
画像信号を演算して光源制御部に信号を送る画像検出部
と、複数の色からなる色フィルターを備えたシャッタ部
と、シャッタ部を制御するためのシャッタ制御部とを有
し、シャッタ部の光透過率を制御することにより画像の
表示を行なう透過型画像表示装置であって、 入力画像信号を動的に演算して、同時に発光している前
記各光源の発光比率を変化させることにより、表示画像
の色再現範囲を変化させ特定の色をより鮮やかに強調表
示させることを可能にした透過型画像表示装置。A plurality of light sources having different emission colors; a light source control unit capable of independently controlling each of the light sources; an image detection unit which calculates an input image signal and sends a signal to the light source control unit; And a shutter control unit for controlling the shutter unit. The transmission type image display device displays an image by controlling the light transmittance of the shutter unit. By dynamically calculating an input image signal and changing a light emission ratio of each of the light sources that emit light at the same time, a color reproduction range of a display image is changed and a specific color is displayed more vividly. A transmissive image display device that makes it possible. 【請求項２】 光源の発光比率を変化させたことによっ
て、前記特定の色以外の色が変化することを抑えるため
に、入力画像信号を補正してシャッタ制御部に入力する
色補正演算部を有する特請求項１記載の透過型画像表示
装置。2. A color correction operation unit for correcting an input image signal and inputting the input image signal to a shutter control unit in order to suppress a change in a color other than the specific color due to a change in a light emission ratio of a light source. 2. The transmission type image display device according to claim 1, comprising: 【請求項３】 前記光源の発光比率の変化および前記入
力画像信号の補正を行なう際に、白色輝度を変化させな
いために光源全体の発光量を制御する請求項２記載の透
過型画像表示装置。3. The transmissive image display device according to claim 2, wherein when changing the light emission ratio of the light source and correcting the input image signal, the light emission amount of the entire light source is controlled so as not to change the white luminance.
JP2000336453A 2000-11-02 2000-11-02 Transmission type image display device and driving method of transmission type image display device Expired - Lifetime JP4594510B2 (en)

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