JPH0511731A - Display control device - Google Patents

Display control device

Info

Publication number
JPH0511731A
JPH0511731A JP3192620A JP19262091A JPH0511731A JP H0511731 A JPH0511731 A JP H0511731A JP 3192620 A JP3192620 A JP 3192620A JP 19262091 A JP19262091 A JP 19262091A JP H0511731 A JPH0511731 A JP H0511731A
Authority
JP
Japan
Prior art keywords
color
display control
display device
control device
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
Application number
JP3192620A
Other languages
Japanese (ja)
Inventor
Ryuichi Sakano
竜一 坂野
Takeshi Yamauchi
剛 山内
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3192620A priority Critical patent/JPH0511731A/en
Publication of JPH0511731A publication Critical patent/JPH0511731A/en
Pending legal-status Critical Current

Links

Landscapes

  • Processing Of Color Television Signals (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

PURPOSE:To obtain a display control device which eliminates such a conventional case in which a color looks like one different from the color displayed originally on a display device due to light around the display device. CONSTITUTION:A brightness signal from light receiving elements 6a to 6c with an RGB filter is compressed logarithmically in logarithmic compression circuits 7a to 7c and ADD-converted by an A/D converters 8a to 8c. A color pallet 3 is re-written according to the data gamma-compensated in a gamma compensation circuit 9 to obtain a proper balance of white level. Thus the white level is adjusted according to the brightness of light around a display device 1, and reproducibility of color can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は表示制御装置に関し、
特にパーソナルコンピュータに用いる表示制御装置の改
良に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device,
In particular, it relates to improvement of a display control device used in a personal computer.

【0002】[0002]

【従来の技術】図3は従来の表示制御装置を示す構成図
であり、図において、1はCRTや液晶パネルなどの表
示デバイス、2は該表示デバイス1に信号を送る表示制
御回路、3aは表示制御回路2内にある色を選択するた
めのカラーパレット、4は表示制御回路2に信号を送る
CPU、5は一時的に表示データを記憶するためのビデ
オメモリである。
2. Description of the Related Art FIG. 3 is a block diagram showing a conventional display control device, in which 1 is a display device such as a CRT or a liquid crystal panel, 2 is a display control circuit for sending a signal to the display device 1, and 3a is a display control circuit. A color palette for selecting a color in the display control circuit 2, 4 is a CPU for sending a signal to the display control circuit 2, and 5 is a video memory for temporarily storing display data.

【0003】次に動作について説明する。CPU4から
の信号によりカラーパレット3a内の色が選択され、表
示されるデータが一度ビデオメモリ5に書き込まれる。
そして表示制御回路2により表示デバイス1に応じたタ
イミングで表示データが表示デバイス1に読み出され、
表示される。
Next, the operation will be described. A color in the color palette 3a is selected by a signal from the CPU 4, and the displayed data is once written in the video memory 5.
Then, the display control circuit 2 reads the display data to the display device 1 at a timing according to the display device 1,
Is displayed.

【0004】[0004]

【発明が解決しようとする課題】従来の表示制御装置は
以上のように構成されているので、表示デバイス周囲の
光の色温度により本来表示されている色とは異なる色に
見える場合があり、色再現性が悪かった。
Since the conventional display control device is configured as described above, it may look different from the originally displayed color due to the color temperature of the light around the display device. The color reproducibility was poor.

【0005】この発明は上記のような問題点を解消する
ためになされたもので、表示デバイス周囲の光の色温度
によらず、本来表示しようとしている色に見えるように
表示デバイスに表示される色再現性のよい表示制御装置
を得ることを目的とする。
The present invention has been made in order to solve the above-mentioned problems, and is displayed on a display device so that it looks like the color originally intended to be displayed, regardless of the color temperature of light around the display device. An object is to obtain a display control device with good color reproducibility.

【0006】[0006]

【課題を解決するための手段】この発明に係る表示制御
装置は、RGBカラーフィルタの付いた受光素子と、該
受光素子からの信号を処理する処理手段とを備え、該処
理手段からの信号をもとにカラーパレットを書き換えて
色調整を行うようにしたものである。
A display control device according to the present invention comprises a light-receiving element having an RGB color filter and a processing means for processing a signal from the light-receiving element, and outputs a signal from the processing means. Originally, the color palette was rewritten to perform color adjustment.

【0007】[0007]

【作用】この発明においては、RGBカラーフィルタの
付いた受光素子で得られた信号を処理手段で処理し、該
処理手段からの信号をもとにカラーパレットを書き換え
るようにしたから、色調整を行うことができ、表示デバ
イスの色の再現性がよくなる。
According to the present invention, the signal obtained by the light receiving element having the RGB color filter is processed by the processing means, and the color palette is rewritten based on the signal from the processing means. It is possible to improve the color reproducibility of the display device.

【0008】[0008]

【実施例】図1はこの発明の一実施例による表示制御装
置を示す構成図である。図において、図3と同一符号は
同一又は相当部分を示し、6a,6b,6cは表示デバ
イス周囲の光をRGBそれぞれ光電変換する受光素子、
7a,7b,7cは受光素子6a〜6cの信号を対数圧
縮するための対数圧縮回路、8a,8b,8cは対数圧
縮回路7a〜7cにより対数圧縮されたアナログ信号を
ディジタル信号に変換するためのA/Dコンバータであ
る。9はA/Dコンバータ8a〜8cからの信号を受
け、輝度と明るさの直線性を補正するためのγ補正回路
である。上記対数圧縮回路7a〜7c,A/Dコンバー
タ8a〜8c,γ補正回路9により、上記受光素子6a
〜6cの信号を処理する処理手段が構成されている。3
は表示制御回路2内の色を選択するためのカラーパレッ
トで、上記γ補正回路9からの信号を受け、該信号をも
とにカラーパレット3のデータを書き換え、白レベルの
調整を行う。
1 is a block diagram showing a display control device according to an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding portions, and 6a, 6b, 6c are light receiving elements for photoelectrically converting light around the display device into RGB.
Reference numerals 7a, 7b and 7c are logarithmic compression circuits for logarithmically compressing the signals of the light receiving elements 6a to 6c, and 8a, 8b and 8c are for converting analog signals logarithmically compressed by the logarithmic compression circuits 7a to 7c into digital signals. It is an A / D converter. A gamma correction circuit 9 receives signals from the A / D converters 8a to 8c and corrects the linearity of brightness and brightness. By the logarithmic compression circuits 7a to 7c, the A / D converters 8a to 8c, and the γ correction circuit 9, the light receiving element 6a is formed.
Processing means for processing the signals of 6c are configured. Three
Is a color palette for selecting a color in the display control circuit 2, which receives a signal from the γ correction circuit 9 and rewrites the data of the color palette 3 based on the signal to adjust the white level.

【0009】次に動作について説明する。まず、表示デ
バイス1の周囲の光をRGBカラースペースで定義され
るRGBカラーフィルタのついた受光素子6a〜6cに
より光電変換する。この受光素子6a〜6cで得られた
RGBの輝度信号は10-12 Aから10-6A程度とダイ
ナミックレンジが広いので、対数圧縮回路7a〜7cに
より対数圧縮する。さらに、この対数圧縮されたアナロ
グ信号をA/Dコンバータ8a〜8cによりディジタル
信号に変換する。一般にRGBの輝度と画面の明るさと
は必ずしも直線的な関係になっていないので、このA/
Dコンバータ8a〜8cよりの信号をγ補正回路9によ
り補正する。次に、このγ補正されたRGB各輝度レベ
ルに応じたデータ分だけカラーパレット3の内部データ
をシフトすることにより、適性な白レベルのバランスを
とる。このようにカラーパレット3のデータは表示デバ
イス1の周囲の光の変化に応じて随時書き換えられ、白
レベルの調整が常に行われる。この状態で、従来と同様
にCPU4からの信号によりカラーパレット3の中の色
が選択され、表示デバイス1に表示される。
Next, the operation will be described. First, the light around the display device 1 is photoelectrically converted by the light receiving elements 6a to 6c having the RGB color filters defined by the RGB color space. Since the RGB luminance signals obtained by the light receiving elements 6a to 6c have a wide dynamic range of about 10 −12 A to 10 −6 A, they are logarithmically compressed by the logarithmic compression circuits 7a to 7c. Further, the logarithmically compressed analog signal is converted into a digital signal by the A / D converters 8a to 8c. Generally, the brightness of RGB and the brightness of the screen do not always have a linear relationship.
The signals from the D converters 8a to 8c are corrected by the γ correction circuit 9. Next, by shifting the internal data of the color palette 3 by the amount of data corresponding to each γ-corrected RGB luminance level, an appropriate white level is balanced. In this way, the data of the color palette 3 is rewritten at any time according to the change of the light around the display device 1, and the white level is constantly adjusted. In this state, a color from the color palette 3 is selected by a signal from the CPU 4 and displayed on the display device 1 as in the conventional case.

【0010】このように本実施例では、受光素子6a〜
6cで得られたRGBの輝度信号を、対数圧縮回路7a
〜7cで対数圧縮し、A/Dコンバータ8a〜8cでA
/D変換し、γ補正回路9でγ補正し、適性な白レベル
になるようにカラーパレット3を書き換えるようにした
ので、表示デバイス1の周囲の光のRGBの輝度レベル
に応じてカラーパレットにより白レベルが調整され、色
再現性のよい表示制御装置が得られる。
Thus, in this embodiment, the light receiving elements 6a ...
The RGB luminance signal obtained in 6c is converted to a logarithmic compression circuit 7a.
~ 7c logarithmically compressed, A / D converters 8a-8c
Since the color palette 3 is rewritten so as to have an appropriate white level by performing the D / D conversion, and the gamma correction circuit 9 performs the gamma correction, the color palette is changed according to the RGB brightness level of the ambient light of the display device 1. A white level is adjusted, and a display controller with good color reproducibility can be obtained.

【0011】図2はこの発明の他の実施例による表示制
御装置を示す構成図であり、図において、図1と同一符
号は同一又は相当部分を示す。上記実施例ではγ補正回
路9によるγ補正を、A/D変換した後で行っている
が、図2に示すようにA/Dコンバータ8a〜8cによ
るA/D変換の前に行ってもよい。
FIG. 2 is a block diagram showing a display controller according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 designate the same or corresponding parts. In the above embodiment, the γ correction by the γ correction circuit 9 is performed after the A / D conversion, but it may be performed before the A / D conversion by the A / D converters 8a to 8c as shown in FIG. .

【0012】[0012]

【発明の効果】以上のようにこの発明に係る表示制御装
置によれば、RGBカラーフィルタの付いた受光素子で
得られた信号を、処理手段で処理し、該処理手段からの
信号をもとにカラーパレットを書き換えるようにしたの
で、表示デバイスの周囲の光のRGBの輝度レベルに応
じて色調整され、色再現性のよい表示制御装置が得られ
る効果がある。
As described above, according to the display control device of the present invention, the signal obtained by the light receiving element having the RGB color filters is processed by the processing means, and the signal from the processing means is used as the basis. Since the color palette is rewritten, the color adjustment is performed according to the RGB brightness levels of the ambient light of the display device, and the display control device with good color reproducibility can be obtained.

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

【図1】この発明の一実施例による表示制御装置を示す
構成図。
FIG. 1 is a configuration diagram showing a display control device according to an embodiment of the present invention.

【図2】この発明の他の実施例による表示制御装置を示
す構成図。
FIG. 2 is a configuration diagram showing a display control device according to another embodiment of the present invention.

【図3】従来の表示制御装置を示す構成図。FIG. 3 is a configuration diagram showing a conventional display control device.

【符号の説明】[Explanation of symbols]

1 表示デバイス 2 表示制御回路 3 カラーパレット 4 CPU 5 ビデオメモリ 6a〜6c 受光素子 7a〜7c 対数圧縮回路 8a〜8c A/Dコンバータ 9 γ補正回路 DESCRIPTION OF SYMBOLS 1 display device 2 display control circuit 3 color palette 4 CPU 5 video memory 6a to 6c light receiving element 7a to 7c logarithmic compression circuit 8a to 8c A / D converter 9 gamma correction circuit

Claims (1)

【特許請求の範囲】 【請求項1】 CPUからの信号によりカラーパレット
内の色を選択し、表示デバイスに表示する表示制御装置
において、 RGBカラーフィルタの付いた受光素子と、 該受光素子からの信号を処理する処理手段とを備え、 該処理手段からの信号をもとに上記カラーパレットを書
き換えて色調整を行うようにしたことを特徴とする表示
制御装置。
Claim: What is claimed is: 1. A display control device for selecting a color in a color palette according to a signal from a CPU and displaying the color on a display device. The light receiving element having an RGB color filter, and the light receiving element from the light receiving element. A display control device comprising a processing means for processing a signal, wherein the color palette is rewritten based on the signal from the processing means to perform color adjustment.
JP3192620A 1991-07-05 1991-07-05 Display control device Pending JPH0511731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3192620A JPH0511731A (en) 1991-07-05 1991-07-05 Display control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3192620A JPH0511731A (en) 1991-07-05 1991-07-05 Display control device

Publications (1)

Publication Number Publication Date
JPH0511731A true JPH0511731A (en) 1993-01-22

Family

ID=16294292

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3192620A Pending JPH0511731A (en) 1991-07-05 1991-07-05 Display control device

Country Status (1)

Country Link
JP (1) JPH0511731A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0619675A1 (en) * 1993-04-06 1994-10-12 International Business Machines Corporation Colour image display system
EP1217598A3 (en) * 2000-12-22 2004-12-08 Visteon Global Technologies, Inc. Automatic brightness control system and method for a display device using a logarithmic sensor
US9070494B2 (en) 2011-03-17 2015-06-30 Furukawa Electric Co., Ltd. Fixation structure of superconducting cable and fixation structure of superconducting cable line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0619675A1 (en) * 1993-04-06 1994-10-12 International Business Machines Corporation Colour image display system
EP1217598A3 (en) * 2000-12-22 2004-12-08 Visteon Global Technologies, Inc. Automatic brightness control system and method for a display device using a logarithmic sensor
US9070494B2 (en) 2011-03-17 2015-06-30 Furukawa Electric Co., Ltd. Fixation structure of superconducting cable and fixation structure of superconducting cable line

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