JPS6116691A - Color temperature control circuit of color television receiver - Google Patents
Color temperature control circuit of color television receiverInfo
- Publication number
- JPS6116691A JPS6116691A JP13767484A JP13767484A JPS6116691A JP S6116691 A JPS6116691 A JP S6116691A JP 13767484 A JP13767484 A JP 13767484A JP 13767484 A JP13767484 A JP 13767484A JP S6116691 A JPS6116691 A JP S6116691A
- Authority
- JP
- Japan
- Prior art keywords
- ambient light
- color temperature
- output
- sensor
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明は、カラーテレビジョン受像機に係り、特には、
画面上の白の色温度を制御するための回路に関する。[Detailed Description of the Invention] Technical Field> The present invention relates to a color television receiver, and in particular:
This invention relates to a circuit for controlling the color temperature of white on a screen.
く従来技術〉
従来、カラーテレビジョン受像機の画面上の白の色温度
は固定されているが、視聴者の画面上の白に対する好み
は、照明光等の周囲光の色温度が変化することによって
変化する。この画面上の白の色温度は、周囲の照明光の
色温度に約３０００Ｋを加えた色温度が好ましく、した
がって、周囲光の変化に応じて画面上の白の色温度゛を
制御することが望ましい。Conventional technology: Conventionally, the color temperature of white on the screen of a color television receiver is fixed, but viewers' preferences for white on the screen depend on changes in the color temperature of ambient light such as illumination light. It changes depending on. The color temperature of the white on the screen is preferably the color temperature of the surrounding illumination light plus approximately 3000K. Therefore, it is possible to control the color temperature of the white on the screen according to changes in the ambient light. desirable.
〈発明の目的〉
本発明は上述の点に鑑みて成されたものであって、周囲
の光の色温度の変化に応じて画面上の白の色温度を自動
酷に制御することを目的とする。<Object of the Invention> The present invention has been made in view of the above-mentioned points, and an object of the present invention is to automatically control the color temperature of white on a screen according to changes in the color temperature of surrounding light. do.
〈発明の構成〉
本発明は、上述の目的を達成するために、周囲光を検知
するセンサと、該センサがらの出力に基づいて周囲光の
波長を検出する検出回路とを設け、該検出回路からの出
力に応答して色温度を制御するようにしている。<Configuration of the Invention> In order to achieve the above-mentioned object, the present invention includes a sensor that detects ambient light and a detection circuit that detects the wavelength of the ambient light based on the output of the sensor. The color temperature is controlled in response to the output from the
〈実施例〉
以下、図面によって本発明の実施例１こついて詳細に説
明する：図面は本発明の一実施例のブロック図である。<Embodiment> Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The drawings are block diagrams of one embodiment of the present invention.
図において、１はカラーテレビジョン受像機の受信アン
テナ、２は受信アンテナ１で受信された受信信号から希
望す゛る受信信号を選択するチューナ部と、このチュー
ナ部からの出力を増幅する中間周波増幅部とを含む受信
回路、３は受信回路２からの中間周波出力から色差信号
を再生する色信号処理回路、４は同じく受信回路２から
の中間周波出力から輝度信号を再生する輝度信号処理回
路、５は色信号処理回路３および輝度信号処理回路４か
らの色差信号および輝度信号から赤（Ｒ）、録（Ｇ）、
青（Ｂ）の３原色信号を出力する原色ドライブ方式のマ
トリクス回路、１３，１４；１５はマトリクス回路５の
各出力端子から出力されるＲ、Ｇ、Ｂ原色信号をそれぞ
れ増幅するＲ、Ｇ。In the figure, 1 is a receiving antenna of a color television receiver, 2 is a tuner section that selects a desired received signal from the received signals received by the receiving antenna 1, and an intermediate frequency amplification section that amplifies the output from this tuner section. 3 is a color signal processing circuit that reproduces a color difference signal from the intermediate frequency output from the receiving circuit 2; 4 is a luminance signal processing circuit that also reproduces a luminance signal from the intermediate frequency output from the receiving circuit 2; 5; are red (R), record (G),
13, 14; 15 are R, G circuits that amplify the R, G, and B primary color signals outputted from each output terminal of the matrix circuit 5;
Ｂ信号増幅器、１６．１？、、１８はＲ，Ｇ、Ｂ信号増
幅器１３’、１４．１５に個別的に対応して設けられ各
増幅器出力の直流（ＤＣ）レベルをシフトさせて画面上
の暗さを制御する直流レベルシフト回路、１９はカラー
受像管である。B signal amplifier, 16.1? , , 18 are provided corresponding to the R, G, and B signal amplifiers 13' and 14.15 individually, and control the darkness on the screen by shifting the direct current (DC) level of each amplifier output. The circuit 19 is a color picture tube.
この実施例のカラーテレビジョン受像機の色温度制御回
路は、周囲光を検知するセンサ６と、該センサ６からの
出力に基づいて周囲光の波長を検出する検出回路７とを
有し、さらに該検出回路７からの出力に応答して３原色
信号Ｒ，Ｇ、Ｂの利得および直流レベルを制御する制御
回路８を有する。The color temperature control circuit of the color television receiver of this embodiment includes a sensor 6 that detects ambient light, and a detection circuit 7 that detects the wavelength of the ambient light based on the output from the sensor 6. A control circuit 8 is provided for controlling the gains and DC levels of the three primary color signals R, G, and B in response to the output from the detection circuit 7.
センサ６は、例えば光の波長に対応した出力を与える７
オＦダイオードから構成され、長波長および短波長の光
にそれぞれ対応する長波長センサ６ａと短波長センサ６
ｂとから成る。このセンサ６の出力は、視感度補正回路
９および検出回路７に与えられる。視感度補正回路９で
は、人の比視感度曲線に合うようにセンサ６からの検知
出力を補正し、周囲の輝度に比例する直流電圧を輝度処
理回路４に与える。輝度処理回路４では、視感度補正回
路９からの出力に応答して輝度のコンＦラスＹを変化さ
せて周囲の輝度に合うように補正する。The sensor 6 provides an output 7 corresponding to the wavelength of light, for example.
A long wavelength sensor 6a and a short wavelength sensor 6, which are composed of off-F diodes and correspond to long wavelength and short wavelength light, respectively.
It consists of b. The output of this sensor 6 is given to a visibility correction circuit 9 and a detection circuit 7. The visibility correction circuit 9 corrects the detection output from the sensor 6 to match the human specific visibility curve, and supplies the brightness processing circuit 4 with a DC voltage proportional to the surrounding brightness. The brightness processing circuit 4 changes the brightness con F plus Y in response to the output from the visibility correction circuit 9 and corrects it to match the surrounding brightness.
検出回路７では、センサ６の出力に基づいて周囲光の色
温度に対応する周囲光の波長を検出し、対応する直流電
圧を制御回路８に与える。この周囲光の波長の検出は、
センサ６を構成す、る２つの７オ１ダイオードの短絡電
流比が入力波長に比例することを利用して行なわれる。The detection circuit 7 detects the wavelength of ambient light corresponding to the color temperature of the ambient light based on the output of the sensor 6, and supplies the corresponding DC voltage to the control circuit 8. Detection of this ambient light wavelength is
This is done by utilizing the fact that the short-circuit current ratio of the two 7O1 diodes constituting the sensor 6 is proportional to the input wavelength.
この制御回路８は、検出回路７からの出力に応答して３
原色信号Ｒ，Ｇ、Ｂの利得および直流レベルを制御し、
これによって周囲光の変化に応じて画面上の白の色温・
度を制御する。This control circuit 8 responds to the output from the detection circuit 7 to
Controls the gain and DC level of the primary color signals R, G, B,
This allows the color temperature of the white on the screen to change depending on changes in ambient light.
Control the degree.
この実施例では、明るい側での白の色温度の制御は、明
部制御回路１０ａ、１１ａ、１２ａで３原色信号Ｒ’、
Ｇ、Ｂの利得を制御することによって行なわれ、暗い側
での白の色温度の制御は、暗部制御回路１０ｂ、１ ｌ
ｂ、１２ｂで３原色信号Ｒ，Ｇ、Ｂの直流レベルを制御
することによって行なわれる。In this embodiment, the white color temperature on the bright side is controlled by three primary color signals R',
This is done by controlling the gains of G and B, and the white color temperature on the dark side is controlled by the dark area control circuits 10b and 1l.
This is done by controlling the direct current levels of the three primary color signals R, G, and B using signals b and 12b.
この場合の白の色温度は、周囲光の色温度に３０００Ｋ
を加えた色温度になるように制御される。The color temperature of white in this case is 3000K to the color temperature of the ambient light.
The color temperature is controlled to be the same as the color temperature.
〈発明の効果〉
以上のように本発明１こよれば、周囲光を検知するセン
サと、該センサからの出力に基づいて周囲光の波長を検
出する検出回路とを有し、該検出回路からの出力に応答
して色温度を制御するので、周囲光の色温度の変化に応
じて画面上の白の色温度が好ましい色温度に自動的に制
御されることになる。<Effects of the Invention> As described above, according to the present invention, the present invention includes a sensor that detects ambient light, and a detection circuit that detects the wavelength of the ambient light based on the output from the sensor. Since the color temperature is controlled in response to the output of , the color temperature of white on the screen is automatically controlled to a preferred color temperature in response to changes in the color temperature of ambient light.
図面は本発明の一実施例のブロック図である。
６・・・センサ、７・・・検出回路、８・・・制御回路
。The drawing is a block diagram of one embodiment of the present invention. 6...Sensor, 7...Detection circuit, 8...Control circuit.
Claims (1)
に基づいて周囲光の波長を検出する検出回路とを有し、
該検出回路からの出力に応答して色温度を制御すること
を特徴とするカラーテレビジョン受像機の色温度制御回
路。(1) It has a sensor that detects ambient light and a detection circuit that detects the wavelength of the ambient light based on the output from the sensor,
A color temperature control circuit for a color television receiver, characterized in that the color temperature is controlled in response to an output from the detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13767484A JPS6116691A (en) | 1984-07-02 | 1984-07-02 | Color temperature control circuit of color television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13767484A JPS6116691A (en) | 1984-07-02 | 1984-07-02 | Color temperature control circuit of color television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6116691A true JPS6116691A (en) | 1986-01-24 |
Family
ID=15204165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13767484A Pending JPS6116691A (en) | 1984-07-02 | 1984-07-02 | Color temperature control circuit of color television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6116691A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04243392A (en) * | 1991-01-17 | 1992-08-31 | Matsushita Electric Ind Co Ltd | White balance controller |
| EP0700218A2 (en) * | 1994-08-04 | 1996-03-06 | Lg Electronics Inc. | Image compensation system for video appliances and methods thereof |
| EP0863677A1 (en) * | 1997-03-08 | 1998-09-09 | Lg Electronics Inc. | Surrounding light judging method and video compensation control apparatus using the same |
| JP2008129380A (en) * | 2006-11-22 | 2008-06-05 | Sony Corp | Display device |
| US8786585B2 (en) | 2010-02-22 | 2014-07-22 | Dolby Laboratories Licensing Corporation | System and method for adjusting display based on detected environment |
-
1984
- 1984-07-02 JP JP13767484A patent/JPS6116691A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04243392A (en) * | 1991-01-17 | 1992-08-31 | Matsushita Electric Ind Co Ltd | White balance controller |
| EP0700218A2 (en) * | 1994-08-04 | 1996-03-06 | Lg Electronics Inc. | Image compensation system for video appliances and methods thereof |
| EP0700218A3 (en) * | 1994-08-04 | 1997-01-02 | Lg Electronics Inc | Image compensation system for video appliances and methods thereof |
| EP0863677A1 (en) * | 1997-03-08 | 1998-09-09 | Lg Electronics Inc. | Surrounding light judging method and video compensation control apparatus using the same |
| JP2008129380A (en) * | 2006-11-22 | 2008-06-05 | Sony Corp | Display device |
| US8786585B2 (en) | 2010-02-22 | 2014-07-22 | Dolby Laboratories Licensing Corporation | System and method for adjusting display based on detected environment |
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