JPH04243392A - White balance controller - Google Patents

White balance controller

Info

Publication number
JPH04243392A
JPH04243392A JP371691A JP371691A JPH04243392A JP H04243392 A JPH04243392 A JP H04243392A JP 371691 A JP371691 A JP 371691A JP 371691 A JP371691 A JP 371691A JP H04243392 A JPH04243392 A JP H04243392A
Authority
JP
Japan
Prior art keywords
signal
sets
detection sensor
external light
circuits
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
JP371691A
Other languages
Japanese (ja)
Inventor
Masahiro Takeshima
正弘 竹島
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP371691A priority Critical patent/JPH04243392A/en
Publication of JPH04243392A publication Critical patent/JPH04243392A/en
Pending legal-status Critical Current

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  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To control the white balance automatically to that most suited to the lightness of an external light at that time, a color temperature of an external light or an external atmospheric temperature by integrating an external light lightness sensor, an external light color temperature sensor or an external temperature sensor into a controller. CONSTITUTION:R, G, B signal cut-off level adjustment circuits 3, 4, 5 control a DC level of R, G, B signals according to a signal inputted from an amplifier 2. Simultaneously, R and B signal drive adjustment circuits 6, 7 control a gain of the R and B signals respectively according to the signal inputted from the amplifier 2. Moreover, an R signal matrix circuit 8 generates a primary color signal R based on a luminance signal Y and a color difference signal R-Y and a DC level and a gain of the R signal are adjusted according to the signal from the circuits 3, 6 simultaneously and primary color signals G, B are generated similarly from the G, B signals. Thus, the white balance is automatically controlled to that most suited to external light lightness and external temperature or the like.

Description

【発明の詳細な説明】   【0001】 【産業上の利用分野】本発明はテレビジョンのホワイト
バランスの制御に関するものであり、特に改良された外
光の明るさ及び外光の色温度及び外気温度によってホワ
イトバランスを自動制御する装置に関するものである。 【0002】 【従来の技術】近年、テレビジョンの大画面化は目ざま
しいものがあり、そのため画質に関する要求はますます
高まりつつある。とりわけテレビジョンのホワイトバラ
ンスが、画質に与える影響は大なるものがある。図2は
従来のホワイトバランス制御装置を示すブロック図であ
る。3はR信号のDCレベルを制御することでR信号の
カットオフレベルを制御する回路である。4はG信号の
DCレベルを制御することでG信号のカットオフレベル
を制御する回路である。5はB信号のDCレベルを制御
することでB信号のカットオフレベルを制御する回路で
ある。6はR信号のゲインを制御することでR信号のド
ライブレベルを制御する回路である。7はB信号のゲイ
ンを制御することでB信号のドライブレベルを制御する
回路である。8は輝度信号Yと色差信号R−Yを演算し
て原色信号Rをつくり、同時に前記R信号カットオフレ
ベル制御回路3および前記R信号ドライブ制御回路6か
ら送られて来る信号に従ってそれぞれR信号のDCレベ
ルおよびゲインを調整する回路である。9は輝度信号Y
と色差信号G−Yを演算して原色信号Gをつくり、同時
に前記G信号カットオフレベル制御回路4から送られて
来る信号に従ってG信号のDCレベルを調整する回路で
ある。10は輝度信号Yと色差信号B−Yを演算して原
色信号Bをつくり、同時に前記B信号カットオフレベル
制御回路5および前記B信号ドライブ制御回路7から送
られて来る信号に従ってそれぞれR信号のDCレベルお
よびゲインを調整する回路である。11はCRTである
。 【0003】以上のように構成された従来のホワイトバ
ランス制御装置においては、R信号カットオフレベル調
整回路3中のボリュウムを外から調整することでR信号
のDCレベルを制御し、同時にG信号カットオフレベル
調整回路4中のボリュウムを外から調整することでG信
号のDCレベルを制御し、同時にB信号カットオフレベ
ル調整回路5中のボリュウムを外から調整することでB
信号のDCレベルを制御し、同時にR信号ドライブ調整
回路6中のボリュウムを外から調整することでR信号の
ゲインを制御し、同時にB信号ドライブ調整回路7中の
ボリュウムを外から調整することでR信号のゲインを制
御する。またR信号マトリクス回路8では輝度信号Yと
色差信号R−Yを演算して原色信号Rをつくり、同時に
前記R信号カットオフレベル調整回路3および前記R信
号ドライブ調整回路6から送られて来る信号に従ってそ
れぞれR信号のDCレベルおよびゲインを調整し、G信
号マトリクス回路9は輝度信号Yと色差信号G−Yを演
算して原色信号Gをつくり、同時に前記G信号カットオ
フレベル調整回路4から送られて来る信号に従ってG信
号のDCレベルを調整し、B信号マトリクス回路10は
輝度信号Yと色差信号B−Yを演算して原色信号Bをつ
くり、同時に前記B信号カットオフレベル調整回路5お
よび前記B信号ドライブ調整回路7から送られて来る信
号に従ってそれぞれR信号のDCレベルおよびゲインを
調整する。 【0004】 【発明が解決しようとする課題】しかしながら前記のよ
うな構成では、工場での調整時にホワイトバランスが一
義的に決定されると、その設定値のままR,G,Bそれ
ぞれのカットオフレベルおよびドライブレベルが固定さ
れてしまい、視聴者はテレビジョンの使用環境に応じて
の最適なホワイトバランスで、テレビジョンを視聴する
ことが不可能であった。本発明はかかる問題点に鑑み、
視聴者がテレビジョンの使用環境に応じた最適なホワイ
トバランスでのテレビジョンの視聴を可能とすることを
目的とする。 【0005】 【課題を解決するための手段】  上記問題を解決する
ために本発明の自動ホワイトバランス制御装置は、外光
の明るさを検出する外光明るさ検出センサと、外気温度
を検出する外気温度検出センサと、前記外光明るさ検出
センサの出力を増幅する増幅器と、前記外気温度検出セ
ンサの出力を増幅する増幅器と、テレビジョン信号の輝
度信号と三組の色差信号から原色信号を作る三組のマト
リックス回路と、前記三組のマトリックス回路のDCレ
ベルをそれぞれ制御する三組のカットオフ調整回路と、
前記三組のマトリックス回路のうちRとBの二組のマト
リックス回路の利得を制御する二組のドライブ調整回路
を供えたことを特徴とするホワイトバランス制御装置で
ある。 【0006】 【作用】本発明は前記した構成により、前記外光明るさ
検出センサの出力と前記外気温度検出センサの出力を前
記三組のカットオフ調整回路に入力し、前記三組のマト
リックス回路のDCレベルを制御するとともに、前記外
光明るさ検出センサの出力と前記外気温度検出センサの
出力を前記2組のドライブ回路に入力し、前記三組のマ
トリックス回路の利得を制御することで、最適なホワイ
トバランスに自動制御する。 【0007】 【実施例】 図1は本発明の一実施例における自動ホワ
イトバランス制御装置の構成を示すブロック図である。 なお従来例と同一機能については同一番号をつけ、説明
を省略する。 【0008】図1において、1は外光明るさ検出センサ
、または外光色温度検出センサ、または外気温度検出セ
ンサであり、2は前記1のセンサから送られて来る信号
を増幅する信号増幅器である。以上のように構成された
自動ホワイトバランス制御装置について、以下その動作
について説明する。まず検出センサ1において外光の明
るさ、または外光の色温度、または外気温度を電気信号
に変換する。次に信号増幅器2において検出センサ1か
ら送られて来る電気信号を増幅し、R信号カットオフレ
ベル調整回路3、G信号カットオフレベル調整回路4、
B信号カットオフレベル調整回路5、R信号ドライブ調
整回路6、B信号ドライブ調整回路7へと増幅した信号
を送る。R信号カットオフレベル調整回路3においては
、前記増幅器2より入力された信号に従ってR信号のD
Cレベルを制御し、同時にG信号カットオフレベル調整
回路4において、前記増幅器2より入力された信号に従
ってG信号のDCレベルを制御し、同時にB信号カット
オフレベル調整回路5において、前記増幅器2より入力
された信号に従ってB信号のDCレベルを制御し、同時
にR信号ドライブ調整回路6において、前記増幅器2よ
り入力された信号に従ってR信号のゲインを制御し、同
時にB信号ドライブ調整回路7において、前記増幅器2
より入力された信号に従ってB信号のゲインを制御する
。またR信号マトリクス回路8では輝度信号Yと色差信
号R−Yを演算して原色信号Rをつくり、同時に前記R
信号カットオフレベル制御回路3および前記R信号ドラ
イブ制御回路6から送られて来る信号に従ってそれぞれ
R信号のDCレベルおよびゲインを調整し、G信号マト
リクス回路9は輝度信号Yと色差信号G−Yを演算して
原色信号Gをつくり、同時に前記G信号カットオフレベ
ル制御回路4から送られて来る信号に従ってG信号のD
Cレベルを調整し、B信号マトリクス回路10は輝度信
号Yと色差信号B−Yを演算して原色信号Bをつくり、
同時に前記B信号カットオフレベル制御回路5および前
記B信号ドライブ制御回路7から送られて来る信号に従
ってそれぞれR信号のDCレベルおよびゲインを調整す
る。 【0009】以上のように本実施例によれば、外光明る
さ検出センサ、または外光色温度検出センサ、または外
気温度検出センサをホワイトバランス制御装置中に取り
入れることにより、そのときの外光の明るさ、またはそ
のときの外光の色温度、またはそのときの外気温度に最
も適したホワイトバランスに自動制御することが可能と
なる。 【0010】 【発明の効果】以上のように本発明は、外光の明るさを
検出する外光明るさ検出センサと、外気温度を検出する
外気温度検出センサと、前記外光明るさ検出センサの出
力を増幅する増幅器と、前記外気温度検出センサの出力
を増幅する増幅器と、テレビジョン信号の輝度信号と三
組の色差信号から原色信号を作る三組のマトリックス回
路と、前記三組のマトリックス回路のDCレベルをそれ
ぞれ制御する三組のカットオフ調整回路と、前記三組の
マトリックス回路のうちRとBの二組のマトリックス回
路の利得を制御する二組のドライブ調整回路を設けるこ
とにより、視聴者がテレビジョンの使用環境に応じた最
適なホワイトバランスでのテレビジョンの視聴を可能と
することができ、その実用的効果は大きい。
Description: [0001] The present invention relates to the control of the white balance of a television, and particularly to the control of the brightness of outside light, the color temperature of outside light, and the outside air temperature. This invention relates to a device that automatically controls white balance. BACKGROUND OF THE INVENTION In recent years, the screen size of televisions has become remarkable, and as a result, demands regarding image quality are increasing more and more. In particular, the white balance of a television has a great effect on image quality. FIG. 2 is a block diagram showing a conventional white balance control device. 3 is a circuit that controls the cutoff level of the R signal by controlling the DC level of the R signal. 4 is a circuit that controls the cutoff level of the G signal by controlling the DC level of the G signal. 5 is a circuit that controls the cutoff level of the B signal by controlling the DC level of the B signal. 6 is a circuit that controls the drive level of the R signal by controlling the gain of the R signal. 7 is a circuit that controls the drive level of the B signal by controlling the gain of the B signal. 8 calculates the luminance signal Y and the color difference signal RY to create the primary color signal R, and at the same time calculates the R signal according to the signals sent from the R signal cutoff level control circuit 3 and the R signal drive control circuit 6. This is a circuit that adjusts the DC level and gain. 9 is the luminance signal Y
This circuit calculates the color difference signal G-Y to generate the primary color signal G, and at the same time adjusts the DC level of the G signal in accordance with the signal sent from the G signal cutoff level control circuit 4. 10 calculates the luminance signal Y and the color difference signal B-Y to create the primary color signal B, and at the same time calculates the R signal according to the signals sent from the B signal cutoff level control circuit 5 and the B signal drive control circuit 7. This is a circuit that adjusts the DC level and gain. 11 is a CRT. In the conventional white balance control device configured as described above, the DC level of the R signal is controlled by adjusting the volume in the R signal cutoff level adjustment circuit 3 from the outside, and at the same time the DC level of the R signal is cut. By adjusting the volume in the off-level adjustment circuit 4 from the outside, the DC level of the G signal is controlled, and at the same time, by adjusting the volume in the B signal cut-off level adjustment circuit 5 from the outside, the DC level of the G signal is controlled.
By controlling the DC level of the signal and at the same time adjusting the volume in the R signal drive adjustment circuit 6 from the outside, the gain of the R signal is controlled, and at the same time by adjusting the volume in the B signal drive adjustment circuit 7 from the outside. Controls the gain of the R signal. Further, the R signal matrix circuit 8 calculates the luminance signal Y and the color difference signal R-Y to create the primary color signal R, and at the same time, the signal sent from the R signal cutoff level adjustment circuit 3 and the R signal drive adjustment circuit 6 The DC level and gain of the R signal are adjusted accordingly, and the G signal matrix circuit 9 calculates the luminance signal Y and the color difference signal G-Y to create the primary color signal G, which is simultaneously sent from the G signal cutoff level adjustment circuit 4. The B signal matrix circuit 10 calculates the luminance signal Y and the color difference signal B-Y to generate the primary color signal B, and at the same time, the B signal cutoff level adjustment circuit 5 and The DC level and gain of each R signal are adjusted according to the signals sent from the B signal drive adjustment circuit 7. [0004] However, in the above-mentioned configuration, once the white balance is uniquely determined during adjustment at the factory, the cutoffs for R, G, and B are set at the same set values. The level and drive level are fixed, making it impossible for viewers to watch television with the optimal white balance depending on the environment in which the television is used. In view of these problems, the present invention
To enable a viewer to view television with the optimum white balance according to the environment in which the television is used. Means for Solving the Problems In order to solve the above problems, the automatic white balance control device of the present invention includes an external light brightness detection sensor that detects the brightness of external light, and an external light brightness detection sensor that detects the external temperature. an outside temperature detection sensor, an amplifier for amplifying the output of the outside light brightness detection sensor, an amplifier for amplifying the output of the outside temperature detection sensor, and a primary color signal from the brightness signal of the television signal and the three sets of color difference signals. three sets of matrix circuits to be created, and three sets of cutoff adjustment circuits that respectively control the DC levels of the three sets of matrix circuits;
The white balance control device is characterized in that it includes two sets of drive adjustment circuits that control the gains of two sets of R and B matrix circuits among the three sets of matrix circuits. [0006] According to the above-described structure, the present invention inputs the output of the outside light brightness detection sensor and the output of the outside air temperature detection sensor to the three sets of cutoff adjustment circuits, and the three sets of matrix circuits. and inputting the output of the outside light brightness detection sensor and the output of the outside air temperature detection sensor to the two sets of drive circuits, and controlling the gains of the three sets of matrix circuits, Automatically controls the optimal white balance. Embodiment FIG. 1 is a block diagram showing the configuration of an automatic white balance control device according to an embodiment of the present invention. Note that functions that are the same as those of the conventional example are given the same numbers, and explanations thereof will be omitted. In FIG. 1, 1 is an outside light brightness detection sensor, an outside light color temperature detection sensor, or an outside air temperature detection sensor, and 2 is a signal amplifier that amplifies the signal sent from the sensor 1. be. The operation of the automatic white balance control device configured as described above will be described below. First, the detection sensor 1 converts the brightness of outside light, the color temperature of outside light, or the outside air temperature into an electrical signal. Next, the electrical signal sent from the detection sensor 1 is amplified in the signal amplifier 2, and the R signal cutoff level adjustment circuit 3, the G signal cutoff level adjustment circuit 4,
The amplified signal is sent to the B signal cutoff level adjustment circuit 5, the R signal drive adjustment circuit 6, and the B signal drive adjustment circuit 7. In the R signal cutoff level adjustment circuit 3, the D of the R signal is adjusted according to the signal inputted from the amplifier 2.
At the same time, the G signal cutoff level adjustment circuit 4 controls the DC level of the G signal according to the signal input from the amplifier 2, and at the same time, the B signal cutoff level adjustment circuit 5 controls the DC level of the G signal according to the signal input from the amplifier 2. The DC level of the B signal is controlled according to the input signal, and at the same time, the R signal drive adjustment circuit 6 controls the gain of the R signal according to the signal input from the amplifier 2, and at the same time, the B signal drive adjustment circuit 7 controls the gain of the R signal according to the signal input from the amplifier 2. amplifier 2
The gain of the B signal is controlled according to the input signal. Further, the R signal matrix circuit 8 calculates the luminance signal Y and the color difference signal R-Y to create a primary color signal R, and at the same time generates the primary color signal R.
The DC level and gain of the R signal are adjusted according to the signals sent from the signal cutoff level control circuit 3 and the R signal drive control circuit 6, respectively, and the G signal matrix circuit 9 adjusts the luminance signal Y and color difference signal G-Y. The calculation is performed to create the primary color signal G, and at the same time, the D of the G signal is adjusted according to the signal sent from the G signal cutoff level control circuit 4.
After adjusting the C level, the B signal matrix circuit 10 calculates the luminance signal Y and the color difference signal B-Y to generate the primary color signal B.
At the same time, the DC level and gain of the R signal are adjusted in accordance with the signals sent from the B signal cutoff level control circuit 5 and the B signal drive control circuit 7, respectively. As described above, according to this embodiment, by incorporating an external light brightness detection sensor, an external light color temperature detection sensor, or an external temperature detection sensor into the white balance control device, the external light at that time can be adjusted. It becomes possible to automatically control the white balance to be most suitable for the brightness of the image, the color temperature of the outside light at that time, or the outside temperature at that time. As described above, the present invention provides an outside light brightness detection sensor that detects the brightness of outside light, an outside light temperature detection sensor that detects the outside temperature, and an outside light brightness detection sensor that detects the outside light brightness. an amplifier for amplifying the output of the outside temperature detection sensor; three sets of matrix circuits for generating primary color signals from the luminance signal of the television signal and the three sets of color difference signals; and the three sets of matrix circuits. By providing three sets of cutoff adjustment circuits that respectively control the DC level of the circuit, and two sets of drive adjustment circuits that control the gains of two sets of R and B matrix circuits among the three sets of matrix circuits, It is possible for the viewer to view the television with the optimum white balance according to the environment in which the television is used, and the practical effects thereof are great.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の一実施例における自動ホワイトバラン
ス制御装置のブロック図
FIG. 1 is a block diagram of an automatic white balance control device in one embodiment of the present invention.

【図2】従来のホワイトバランス制御装置のブロック図
[Figure 2] Block diagram of a conventional white balance control device

【符号の説明】[Explanation of symbols]

1  検出センサ 2  増幅器 1 Detection sensor 2 Amplifier

Claims

【特許請求の範囲】   【請求項1】外光の明るさを検出する外光明るさ検出
センサと、前記外光明るさ検出センサの出力を増幅する
増幅器と、テレビジョン信号の輝度信号と三組の色差信
号から原色信号を作る三組のマトリックス回路と、前記
三組のマトリックス回路のDCレベルをそれぞれ制御す
る三組のカットオフ調整回路と、前記三組のマトリック
ス回路のうちRとBの二組のマトリックス回路の利得を
制御する二組のドライブ調整回路を具備し、前記外光明
るさ検出センサの出力を前記三組のカットオフ調整回路
に入力し、前記三組のマトリックス回路のDCレベルを
制御するとともに、前記外光明るさ検出センサの出力を
前記2組のドライブ回路に入力し、前記三組のマトリッ
クス回路の利得を制御することを特徴とするホワイトバ
ランス制御装置。
  【請求項2】外光の明るさを検出する外光明るさ検出セ
ンサに代え、外光の色温度を検出する外光色温度検出セ
ンサを用いたことを特徴とする請求項1記載のホワイト
バランス制御装置。
【請求項3】外光の明るさを検出する外光明るさ検出セ
ンサに代え外気温度を検出する外気温度検出センサを用
いたことを特徴とする請求項1記載のホワイトバランス
制御装置。
【請求項4】請求項1記載の外光明るさ検出センサと、
請求項3記載の外気温度検出センサと、前記外光明るさ
検出センサの出力を増幅する増幅器と、前記外気温度検
出センサの出力を増幅する増幅器と、テレビジョン信号
の輝度信号と三組の色差信号から原色信号を作る三組の
マトリックス回路と、前記三組のマトリックス回路のD
Cレベルをそれぞれ制御する三組のカットオフ調整回路
と、前記三組のマトリックス回路のうちRとBの二組の
マトリックス回路の利得を制御する二組のドライブ調整
回路を具備し、前記外光明るさ検出センサの出力と前記
外気温度検出センサの出力を前記三組のカットオフ調整
回路に入力し、前記三組のマトリックス回路のDCレベ
ルを制御するとともに、前記外光明るさ検出センサの出
力と前記外気温度検出センサの出力を前記2組のドライ
ブ回路に入力し、前記三組のマトリックス回路の利得を
制御することを特徴とするホワイトバランス制御装置。
[Claims] 1. An external light brightness detection sensor that detects the brightness of external light, an amplifier that amplifies the output of the external light brightness detection sensor, and a primary color from a brightness signal of a television signal and three sets of color difference signals. three sets of matrix circuits that generate signals, three sets of cutoff adjustment circuits that respectively control the DC levels of the three sets of matrix circuits, and two sets of matrix circuits R and B among the three sets of matrix circuits. comprising two sets of drive adjustment circuits for controlling gain, inputting the output of the external light brightness detection sensor to the three sets of cutoff adjustment circuits, and controlling the DC level of the three sets of matrix circuits; A white balance control device characterized in that the output of the external light brightness detection sensor is input to the two sets of drive circuits to control the gains of the three sets of matrix circuits. 2. The white according to claim 1, wherein an external light color temperature detection sensor that detects the color temperature of external light is used in place of the external light brightness detection sensor that detects the brightness of external light. Balance control device. 3. The white balance control device according to claim 1, wherein an outside air temperature sensor that detects outside air temperature is used instead of an outside light brightness sensor that detects the brightness of outside light. 4. An external light brightness detection sensor according to claim 1;
The outside temperature detection sensor according to claim 3, an amplifier for amplifying the output of the outside light brightness detection sensor, an amplifier for amplifying the output of the outside temperature detection sensor, and a brightness signal of a television signal and three sets of color differences. Three sets of matrix circuits that generate primary color signals from signals, and D of the three sets of matrix circuits.
The external light is The output of the brightness detection sensor and the output of the outside air temperature detection sensor are input to the three sets of cutoff adjustment circuits to control the DC level of the three sets of matrix circuits, and the output of the outside light brightness detection sensor and outputs of the outside air temperature detection sensor are input to the two sets of drive circuits to control gains of the three sets of matrix circuits.
JP371691A 1991-01-17 1991-01-17 White balance controller Pending JPH04243392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP371691A JPH04243392A (en) 1991-01-17 1991-01-17 White balance controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP371691A JPH04243392A (en) 1991-01-17 1991-01-17 White balance controller

Publications (1)

Publication Number Publication Date
JPH04243392A true JPH04243392A (en) 1992-08-31

Family

ID=11565044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP371691A Pending JPH04243392A (en) 1991-01-17 1991-01-17 White balance controller

Country Status (1)

Country Link
JP (1) JPH04243392A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE41191E1 (en) 1996-06-11 2010-04-06 Samsung Electronics Co., Ltd. Color curve control circuit and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4869424A (en) * 1971-12-22 1973-09-20
JPS5031730A (en) * 1973-07-20 1975-03-28
JPS534427A (en) * 1975-12-31 1978-01-17 Matsushita Electric Ind Co Ltd Color tv receiver
JPS5635592A (en) * 1979-08-31 1981-04-08 Toshiba Corp Automatic white color control circuit for color television picture receiver
JPS60212089A (en) * 1984-04-05 1985-10-24 Matsushita Electric Ind Co Ltd Television receiver
JPS6116691A (en) * 1984-07-02 1986-01-24 Sharp Corp Color temperature control circuit of color television receiver
JPS6297487A (en) * 1985-10-23 1987-05-06 Hitachi Ltd Picture display device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4869424A (en) * 1971-12-22 1973-09-20
JPS5031730A (en) * 1973-07-20 1975-03-28
JPS534427A (en) * 1975-12-31 1978-01-17 Matsushita Electric Ind Co Ltd Color tv receiver
JPS5635592A (en) * 1979-08-31 1981-04-08 Toshiba Corp Automatic white color control circuit for color television picture receiver
JPS60212089A (en) * 1984-04-05 1985-10-24 Matsushita Electric Ind Co Ltd Television receiver
JPS6116691A (en) * 1984-07-02 1986-01-24 Sharp Corp Color temperature control circuit of color television receiver
JPS6297487A (en) * 1985-10-23 1987-05-06 Hitachi Ltd Picture display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE41191E1 (en) 1996-06-11 2010-04-06 Samsung Electronics Co., Ltd. Color curve control circuit and method

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