JPH118778A - Crt control circuit and receiver - Google Patents
Crt control circuit and receiverInfo
- Publication number
- JPH118778A JPH118778A JP16135197A JP16135197A JPH118778A JP H118778 A JPH118778 A JP H118778A JP 16135197 A JP16135197 A JP 16135197A JP 16135197 A JP16135197 A JP 16135197A JP H118778 A JPH118778 A JP H118778A
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- JP
- Japan
- Prior art keywords
- grid
- voltage
- crt
- screen
- circuit
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ディスプレイモニ
ター及びテレビジョン等の受像機に使用されるＣＲＴの
画質を補正するＣＲＴ制御回路、並びにそのＣＲＴ制御
回路を備える受像機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT control circuit for correcting the image quality of a CRT used for a display monitor, a television set or the like, and a receiver provided with the CRT control circuit.
【０００２】[0002]
【従来の技術】図５は、例えば特開平１−１３２２８２
号公報及び特開昭６４−０６１１７４号公報等に開示さ
れた従来の、ＣＲＴの画質を補正するＣＲＴ制御回路の
構成例を示したブロック図である。このＣＲＴ制御回路
は、水平偏向に同期して画面の中心部より周辺部（左右
端部）の方が電圧値が高くなるパラボラ波形の電圧信号
を発生する水平パラボラ電圧発生回路１と、垂直偏向に
同期して画面の中心部より周辺部（上下端部）の方が電
圧値が高くなるパラボラ波形の電圧信号を発生する垂直
パラボラ電圧発生回路２とを備えている。2. Description of the Related Art FIG.
FIG. 1 is a block diagram showing an example of the configuration of a conventional CRT control circuit for correcting the image quality of a CRT disclosed in Japanese Patent Application Laid-Open Publication No. Sho. The CRT control circuit includes a horizontal parabolic voltage generating circuit 1 that generates a parabolic waveform voltage signal in which a voltage value is higher in a peripheral portion (left and right end portions) than in a central portion of a screen in synchronization with horizontal deflection. And a vertical parabolic voltage generating circuit 2 for generating a parabolic waveform voltage signal having a higher voltage value at the peripheral portion (upper and lower end portions) than at the central portion of the screen.
【０００３】水平パラボラ電圧発生回路１及び垂直パラ
ボラ電圧発生回路２の各出力は、それぞれ抵抗Ｒ１，Ｒ
２を通じて、加算回路３が有するＯＰアンプＡＭＰ１の
反転入力端子に与えられる。ＯＰアンプＡＭＰ１は、非
反転入力端子が接地され、抵抗Ｒ３により負帰還をかけ
られている。ＯＰアンプＡＭＰ１の出力は、抵抗Ｒ４を
通じて増幅回路４が有するＯＰアンプＡＭＰ２の反転入
力端子に与えられる。増幅回路４は、可変抵抗ＶＲ１に
より負帰還をかけられ、非反転入力端子が接地されたＯ
ＰアンプＡＭＰ２からなる反転増幅回路である。The outputs of the horizontal parabola voltage generator 1 and the vertical parabola voltage generator 2 are respectively connected to resistors R1 and R1.
2 is supplied to the inverting input terminal of the OP amplifier AMP1 included in the adder circuit 3. The non-inverting input terminal of the OP amplifier AMP1 is grounded, and negative feedback is applied by the resistor R3. The output of the OP amplifier AMP1 is supplied to the inverting input terminal of the OP amplifier AMP2 included in the amplifier circuit 4 through the resistor R4. The amplifier circuit 4 is subjected to negative feedback by the variable resistor VR1, and has a non-inverting input terminal grounded.
This is an inverting amplifier circuit composed of a P amplifier AMP2.
【０００４】ＯＰアンプＡＭＰ２の出力端子は、他端が
接地された可変抵抗ＶＲ２の一端に接続され、可変抵抗
ＶＲ２の可変端子はデカップリングコンデンサＣ２の一
端に接続されている。可変抵抗ＶＲ２及びデカップリン
グコンデンサＣ２は駆動回路６を構成している。デカッ
プリングコンデンサＣ２の他端は、可変直流バイアス電
源Ｅ２の負側端子に接続され、可変直流バイアス電源Ｅ
２の正側端子は、ＣＲＴ５の電子流を加速し画面におけ
る輝点の大きさ及び輝度を調整する正電圧が印加される
第２グリッドＧ２に接続されている。The output terminal of the OP amplifier AMP2 is connected to one end of a variable resistor VR2 whose other end is grounded, and the variable terminal of the variable resistor VR2 is connected to one end of a decoupling capacitor C2. The variable resistor VR2 and the decoupling capacitor C2 constitute a drive circuit 6. The other end of the decoupling capacitor C2 is connected to the negative terminal of the variable DC bias power supply E2,
The second positive terminal 2 is connected to a second grid G2 to which a positive voltage for accelerating the electron flow of the CRT 5 and adjusting the size and brightness of the bright spot on the screen is applied.
【０００５】可変抵抗ＶＲ２の一端は、また、デカップ
リングコンデンサＣ１の一端に接続され、デカップリン
グコンデンサＣ１の他端は、他端が接地されている抵抗
Ｒ５の一端と、可変直流バイアス電源Ｅ１の負側端子と
に接続され、可変直流バイアス電源Ｅ１の正側端子は、
ＣＲＴ５の電子ビームの輝点形状を補正する第３グリッ
ドＧ３に接続されている。第１グリッドＧ１には、負の
直流バイアス電圧（図示せず）が印加されている。[0005] One end of the variable resistor VR2 is connected to one end of a decoupling capacitor C1, and the other end of the decoupling capacitor C1 is connected to one end of a resistor R5 whose other end is grounded, and the other end of the variable DC bias power supply E1. The positive terminal of the variable DC bias power supply E1 is connected to the negative terminal.
It is connected to a third grid G3 for correcting the shape of the bright spot of the electron beam on the CRT 5. A negative DC bias voltage (not shown) is applied to the first grid G1.
【０００６】このような構成のＣＲＴ制御回路の動作を
以下に説明する。水平パラボラ電圧発生回路１が出力
し、水平偏向に同期して画面の中心部より周辺部の方が
電圧値が高くなるパラボラ波形の電圧信号と、垂直パラ
ボラ電圧発生回路２が出力し、垂直偏向に同期して画面
の中心部より周辺部の方が電圧値が高くなるパラボラ波
形の電圧信号とは、加算回路３により加算され反転され
る。The operation of the CRT control circuit having such a configuration will be described below. A horizontal parabola voltage generating circuit 1 outputs a parabolic waveform voltage signal in which the peripheral portion has a higher voltage value than a central portion of the screen in synchronization with horizontal deflection, and a vertical parabolic voltage generating circuit 2 outputs a vertical deflection voltage signal. And a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen in synchronism with.
【０００７】加算され反転されたパラボラ波形の電圧信
号は、増幅回路４により必要な振幅に迄反転増幅され、
デカップリングコンデンサＣ１を通じて、可変直流バイ
アス電源Ｅ１が出力する正の直流電圧に重畳され、ＣＲ
Ｔ５の第３グリッドＧ３に印加される。増幅回路４によ
り必要な振幅に迄増幅されたパラボラ波形の電圧信号
は、デカップリングコンデンサＣ２を通じて、可変直流
バイアス電源Ｅ２が出力する正の直流電圧に重畳され、
ＣＲＴ５の第２グリッドＧ２に印加される。The added and inverted parabolic waveform voltage signal is inverted and amplified to a required amplitude by the amplifier circuit 4.
Through the decoupling capacitor C1, the DC voltage is superimposed on the positive DC voltage output from the variable DC bias power supply E1.
The voltage is applied to the third grid G3 of T5. The parabolic waveform voltage signal amplified to the required amplitude by the amplifier circuit 4 is superimposed on the positive DC voltage output from the variable DC bias power supply E2 through the decoupling capacitor C2.
It is applied to the second grid G2 of CRT5.
【０００８】従来のＣＲＴ制御回路は、このように、第
２グリッドＧ２及び第３グリッドＧ３に、ＣＲＴ５の画
面の中心部より周辺部の方が電圧値が高いパラボラ波形
の互いに異なる電圧信号を印加している。これにより、
ＣＲＴ５の画面の中心部と周辺部とにおける、ヒータ
Ｈ、カソードＫ及びグリッド群からなる電子銃と画面と
の距離の差、並びに電子ビームの画面表面への入射角度
の差に起因する輝点形状の歪みを補正し、均一なフォー
カスを得るようにしている。In the conventional CRT control circuit, different voltage signals having parabolic waveforms having a higher voltage value at the peripheral portion than at the central portion of the screen of the CRT 5 are applied to the second grid G2 and the third grid G3. doing. This allows
The shape of a luminescent spot caused by the difference in the distance between the screen and the electron gun composed of the heater H, the cathode K, and the grid, and the difference in the angle of incidence of the electron beam on the screen surface between the center and the periphery of the screen of the CRT 5 Is corrected to obtain a uniform focus.
【０００９】[0009]
【発明が解決しようとする課題】上述したように、従来
のＣＲＴ制御回路は、第２グリッド及び第３グリッド
に、ＣＲＴ５の画面の中心部より周辺部の方が電圧値が
高いパラボラ波形の互いに異なる電圧信号のみを印加し
ているので、ＣＲＴ５の画面の周辺部における電子ビー
ムの加速電圧が高くなり過ぎ、画面の周辺部の輝度が必
要以上に上昇してしまう問題があった。As described above, in the conventional CRT control circuit, parabolic waveforms having higher voltage values at the peripheral portion than at the central portion of the screen of the CRT 5 are provided on the second grid and the third grid. Since only different voltage signals are applied, there is a problem that the acceleration voltage of the electron beam in the peripheral portion of the screen of the CRT 5 becomes too high, and the luminance in the peripheral portion of the screen increases more than necessary.
【００１０】本発明は、上述したような事情に鑑みてな
されたものであり、ＣＲＴ画面の周辺部の輝度を上昇さ
せることなく、輝点形状の歪みを補正し、均一なフォー
カスを得ることができるＣＲＴ制御回路及びそのＣＲＴ
制御回路を備えた受像機を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to correct the distortion of the bright spot shape and obtain a uniform focus without increasing the brightness of the peripheral portion of the CRT screen. CRT control circuit and its CRT
An object of the present invention is to provide a receiver provided with a control circuit.
【００１１】[0011]
【課題を解決するための手段】第１発明に係るＣＲＴ制
御回路は、ＣＲＴ画面の輝度変調を行う第１グリッド
に、前記ＣＲＴ画面の中心部より周辺部の方が電圧値が
低いパラボラ波形の電圧信号を印加する第１グリッド電
圧印加回路と、ＣＲＴ画面における輝点の大きさ及び輝
度を調整する第２グリッドと輝点形状を補正する第３グ
リッドとに、前記ＣＲＴ画面の中心部より周辺部の方が
電圧値が高いパラボラ波形の互いに異なる電圧信号を印
加する第２グリッド及び第３グリッド電圧印加回路とを
備えることを特徴とする。According to a first aspect of the present invention, there is provided a CRT control circuit, comprising: a first grid for performing brightness modulation of a CRT screen; A first grid voltage application circuit for applying a voltage signal, a second grid for adjusting the size and brightness of a bright spot on the CRT screen, and a third grid for correcting the shape of the bright spot; The unit includes a second grid and a third grid voltage application circuit for applying different voltage signals having a parabolic waveform having a higher voltage value.
【００１２】このＣＲＴ制御回路では、第１グリッド電
圧印加回路が、第１グリッドに、ＣＲＴ画面の中心部よ
り周辺部の方が電圧値が低いパラボラ波形の電圧信号を
印加し、第２グリッド及び第３グリッド電圧印加回路
が、第２グリッド及び第３グリッドに、ＣＲＴ画面の中
心部より周辺部の方が電圧値が高いパラボラ波形の互い
に異なる電圧信号を印加する。これにより、ＣＲＴ画面
の中心部より周辺部の方が電圧値が高いパラボラ波形の
電圧信号のみでなく、周辺部の方が電圧値が低いパラボ
ラ波形の電圧信号も、電子ビームに加えることができ、
電子ビームに加える電圧条件の調整可能範囲が広がるの
で、ＣＲＴ画面の周辺部の輝度を上昇させることなく、
輝点形状の歪みを補正し、均一なフォーカスを得ること
ができる。In this CRT control circuit, the first grid voltage applying circuit applies a parabolic waveform voltage signal having a lower voltage value at the peripheral portion than at the central portion of the CRT screen to the first grid. A third grid voltage application circuit applies different voltage signals having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the CRT screen to the second grid and the third grid. As a result, not only a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the CRT screen, but also a parabolic waveform voltage signal having a lower voltage value at the peripheral portion can be applied to the electron beam. ,
Since the adjustable range of the voltage condition applied to the electron beam is widened, without increasing the brightness around the CRT screen,
It is possible to correct the distortion of the bright spot shape and obtain a uniform focus.
【００１３】第２発明に係るＣＲＴ制御回路は、ＣＲＴ
のカソードに、該ＣＲＴの画面の中心部より周辺部の方
が電圧値が高いパラボラ波形の電圧信号を印加するカソ
ード電圧印加回路と、ＣＲＴ画面における輝点の大きさ
及び輝度を調整する第２グリッドと輝点形状を補正する
第３グリッドとに、前記ＣＲＴの画面の中心部より周辺
部の方が電圧値が高いパラボラ波形の互いに異なる電圧
信号を印加する第２グリッド及び第３グリッド電圧印加
回路とを備えることを特徴とする。[0013] The CRT control circuit according to the second invention is a CRT control circuit.
A cathode voltage application circuit for applying a parabolic waveform voltage signal having a higher voltage value at the periphery than at the center of the screen of the CRT to the cathode of the CRT, and adjusting the size and brightness of the bright spot on the CRT screen A second grid and a third grid voltage application for applying different voltage signals of a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the CRT screen to the grid and the third grid for correcting the bright spot shape. And a circuit.
【００１４】このＣＲＴ制御回路では、カソード電圧印
加回路が、カソードに、ＣＲＴの画面の中心部より周辺
部の方が電圧値が高いパラボラ波形の電圧信号を印加
し、第２グリッド及び第３グリッド電圧印加回路が、第
２グリッド及び第３グリッドに、ＣＲＴの画面の中心部
より周辺部の方が電圧値が高いパラボラ波形の互いに異
なる電圧信号を印加する。これにより、カソード及び第
１グリッド間の電圧分布を、第１グリッドにＣＲＴ画面
の中心部より周辺部の方が電圧値が低いパラボラ波形の
電圧信号を印加する場合と同様にすることができ、ＣＲ
Ｔ画面の中心部より周辺部の方が電圧値が高いパラボラ
波形の電圧信号のみでなく、周辺部の方が電圧値が低い
パラボラ波形の電圧信号も、電子ビームに加えることと
同様のことができ、電子ビームに加える電圧条件の調整
可能範囲が広がるので、ＣＲＴ画面の周辺部の輝度を上
昇させることなく、輝点形状の歪みを補正し、均一なフ
ォーカスを得ることができる。In this CRT control circuit, the cathode voltage applying circuit applies a parabolic waveform voltage signal having a higher voltage value to the cathode at the peripheral portion than at the central portion of the CRT screen, and the second grid and the third grid A voltage applying circuit applies different voltage signals having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the CRT screen to the second grid and the third grid. Thereby, the voltage distribution between the cathode and the first grid can be made similar to the case where a parabolic waveform voltage signal having a lower voltage value at the peripheral portion than at the central portion of the CRT screen is applied to the first grid, CR
Similar to applying a parabolic waveform voltage signal with a lower voltage value to the electron beam, as well as a parabolic waveform voltage signal with a higher voltage value at the peripheral portion than at the center of the T screen, As a result, the adjustable range of the voltage condition applied to the electron beam is widened, so that the bright spot shape distortion can be corrected and uniform focus can be obtained without increasing the brightness of the peripheral portion of the CRT screen.
【００１５】第３発明に係るＣＲＴ制御回路は、パラボ
ラ波形の電圧信号の電圧値を連続的に変化させる可変手
段を備えることを特徴とする。A CRT control circuit according to a third aspect of the present invention is characterized in that the CRT control circuit includes a variable means for continuously changing the voltage value of the voltage signal having a parabolic waveform.
【００１６】このＣＲＴ制御回路では、可変手段がパラ
ボラ波形の電圧信号の電圧値を連続的に変化させること
ができるので、ＣＲＴの画面全体において、輝点形状の
歪みをきめ細かく補正することができる。In this CRT control circuit, since the variable means can continuously change the voltage value of the voltage signal having the parabolic waveform, it is possible to finely correct the distortion of the bright spot shape on the entire screen of the CRT.
【００１７】第４発明に係るＣＲＴ制御回路は、カラー
用ＣＲＴのＲ，Ｇ，Ｂ用の各カソードに、該カラー用Ｃ
ＲＴの画面の中心部より周辺部の方が電圧値が高いパラ
ボラ波形の電圧信号をそれぞれ印加するＲ，Ｇ，Ｂ用の
各カソード電圧印加回路と、カラー用ＣＲＴ画面におけ
る輝点の大きさ及び輝度を調整する第２グリッドと輝点
形状を補正する第３グリッドとに、前記カラー用ＣＲＴ
の画面の中心部より周辺部の方が電圧値が高いパラボラ
波形の互いに異なる電圧信号を印加する第２グリッド及
び第３グリッド電圧印加回路とを備えることを特徴とす
る。A CRT control circuit according to a fourth aspect of the present invention comprises a CRT for a color, a C,
R, G, and B cathode voltage application circuits for applying a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the RT screen; The color CRT is provided on a second grid for adjusting the luminance and a third grid for correcting the shape of the bright spot.
And a second grid and a third grid voltage applying circuit for applying different voltage signals of parabolic waveforms whose peripheral portion has a higher voltage value than the central portion of the screen.
【００１８】このＣＲＴ制御回路では、Ｒ，Ｇ，Ｂ用の
各カソード電圧印加回路が、Ｒ，Ｇ，Ｂ用の各カソード
に、カラー用ＣＲＴの画面の中心部より周辺部の方が電
圧値が高いパラボラ波形の電圧信号をそれぞれ印加し、
第２グリッド及び第３グリッド電圧印加回路が、第２グ
リッド及び第３グリッドに、カラー用ＣＲＴの画面の中
心部より周辺部の方が電圧値が高いパラボラ波形の互い
に異なる電圧信号を印加する。In this CRT control circuit, the cathode voltage application circuits for R, G, and B apply the voltage values to the cathodes for R, G, and B in the peripheral portion of the screen of the color CRT rather than in the central portion. And apply a parabolic waveform voltage signal with high
A second grid and a third grid voltage application circuit apply different voltage signals of parabolic waveforms having a higher voltage value at the peripheral portion than at the central portion of the screen of the color CRT to the second grid and the third grid.
【００１９】これにより、各カソード及び第１グリッド
間の電圧分布を、第１グリッドにＣＲＴ画面の中心部よ
り周辺部の方が電圧値が低いパラボラ波形の電圧信号を
印加する場合と同様にすることができ、ＣＲＴ画面の中
心部より周辺部の方が電圧値が高いパラボラ波形の電圧
信号のみでなく、周辺部の方が電圧値が低いパラボラ波
形の電圧信号も、電子ビームに加えることと同様のこと
ができ、電子ビームに加える電圧条件の調整可能範囲が
広がるので、ＣＲＴ画面の周辺部の輝度を上昇させるこ
となく、輝点形状の歪みを補正し、均一なフォーカスを
得ることができる。Thus, the voltage distribution between each cathode and the first grid is made similar to the case where a parabolic waveform voltage signal having a lower voltage value at the periphery than at the center of the CRT screen is applied to the first grid. It is possible to apply not only a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than the central portion of the CRT screen, but also a parabolic waveform voltage signal having a lower voltage value at the peripheral portion to the electron beam. The same can be done, and the adjustable range of the voltage condition applied to the electron beam is widened, so that the bright spot shape distortion can be corrected and uniform focus can be obtained without increasing the brightness of the peripheral portion of the CRT screen. .
【００２０】第５発明に係るＣＲＴ制御回路は、Ｒ，
Ｇ，Ｂ用の各カソード電圧印加回路と第２グリッド及び
第３グリッド電圧印加回路とは、印加する電圧信号の電
圧値を連続的に変化させる可変手段を各別に備えること
を特徴とする。A CRT control circuit according to a fifth aspect of the present invention comprises R,
Each of the cathode voltage application circuits for G and B, and the second grid and the third grid voltage application circuits are separately provided with variable means for continuously changing the voltage value of the applied voltage signal.
【００２１】このＣＲＴ制御回路では、Ｒ，Ｇ，Ｂ用の
各カソード電圧印加回路と第２グリッド及び第３グリッ
ド電圧印加回路とは、各別に備えている可変手段によ
り、印加する電圧信号の電圧値を連続的に変化させるこ
とができるので、ＣＲＴの画面全体において、Ｒ，Ｇ，
Ｂ毎の輝点形状の歪みをきめ細かく補正することができ
る。In this CRT control circuit, the cathode voltage application circuits for R, G, and B and the second and third grid voltage application circuits are separately provided by variable means, and the voltage of the applied voltage signal is Since the value can be changed continuously, R, G,
The distortion of the bright spot shape for each B can be finely corrected.
【００２２】第６発明に係る受像機は、請求項１〜５の
何れかに記載されたＣＲＴ制御回路を備えることを特徴
とする。According to a sixth aspect of the present invention, there is provided a receiver including the CRT control circuit according to any one of the first to fifth aspects.
【００２３】この受像機では、請求項１〜５の何れかに
記載されたＣＲＴ制御回路を備えるので、ＣＲＴ画面の
周辺部の輝度を上昇させることなく、輝点形状の歪みを
補正し、均一なフォーカスを得ることができる。In this receiver, since the CRT control circuit according to any one of claims 1 to 5 is provided, the distortion of the bright spot shape can be corrected without increasing the brightness of the peripheral portion of the CRT screen, and the uniformity can be obtained. Focus can be obtained.
【００２４】[0024]
【発明の実施の形態】以下に、本発明を、その実施の形
態を示す図面に基づき説明する。 実施の形態１．図１は、第１，３発明に係るＣＲＴ制御
回路の実施の形態の構成を示したブロック図である。こ
のＣＲＴ制御回路は、水平偏向に同期して画面の中心部
より周辺部（左右端部）の方が電圧値が高くなるパラボ
ラ波形の電圧信号を発生する水平パラボラ電圧発生回路
１と、垂直偏向に同期して画面の中心部より周辺部（上
下端部）の方が電圧値が高くなるパラボラ波形の電圧信
号を発生する垂直パラボラ電圧発生回路２とを備えてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of an embodiment of a CRT control circuit according to the first and third inventions. The CRT control circuit includes a horizontal parabolic voltage generating circuit 1 that generates a parabolic waveform voltage signal in which a voltage value is higher in a peripheral portion (left and right end portions) than in a central portion of a screen in synchronization with horizontal deflection. And a vertical parabolic voltage generating circuit 2 for generating a parabolic waveform voltage signal having a higher voltage value at the peripheral portion (upper and lower end portions) than at the central portion of the screen.
【００２５】水平パラボラ電圧発生回路１及び垂直パラ
ボラ電圧発生回路２の各出力は、それぞれ可変抵抗ＶＲ
３，ＶＲ４を通じて、加算回路３が有するＯＰアンプＡ
ＭＰ１の反転入力端子に与えられる。ＯＰアンプＡＭＰ
１は、非反転入力端子が接地され、抵抗Ｒ３により負帰
還をかけられている。ＯＰアンプＡＭＰ１の出力は、抵
抗Ｒ４を通じて増幅回路４が有するＯＰアンプＡＭＰ２
の反転入力端子に与えられる。増幅回路４は、可変抵抗
ＶＲ１により負帰還をかけられ、非反転入力端子が接地
されたＯＰアンプＡＭＰ２からなる反転増幅回路であ
る。Each output of the horizontal parabola voltage generation circuit 1 and the vertical parabola voltage generation circuit 2 is connected to a variable resistor VR.
3 and VR4, the OP amplifier A of the addition circuit 3
It is provided to the inverting input terminal of MP1. OP amplifier AMP
1 has a non-inverting input terminal grounded and is negatively fed back by a resistor R3. The output of the OP amplifier AMP1 is supplied to the OP amplifier AMP2 of the amplifier circuit 4 through the resistor R4.
To the inverting input terminal. The amplifying circuit 4 is an inverting amplifying circuit including an OP amplifier AMP2 to which negative feedback is applied by the variable resistor VR1 and a non-inverting input terminal is grounded.
【００２６】ＯＰアンプＡＭＰ２の出力端子は、他端が
接地された可変抵抗ＶＲ２の一端に接続され、可変抵抗
ＶＲ２の可変端子はデカップリングコンデンサＣ２の一
端に接続されている。可変抵抗ＶＲ２及びデカップリン
グコンデンサＣ２は駆動回路６を構成している。デカッ
プリングコンデンサＣ２の他端は、可変直流バイアス電
源Ｅ２の負側端子に接続され、可変直流バイアス電源Ｅ
２の正側端子は、ＣＲＴ５の電子流を加速し画面におけ
る輝点の大きさ及び輝度を調整する正電圧が印加される
第２グリッドＧ２に接続されている。The output terminal of the OP amplifier AMP2 is connected to one end of a variable resistor VR2 whose other end is grounded, and the variable terminal of the variable resistor VR2 is connected to one end of a decoupling capacitor C2. The variable resistor VR2 and the decoupling capacitor C2 constitute a drive circuit 6. The other end of the decoupling capacitor C2 is connected to the negative terminal of the variable DC bias power supply E2,
The second positive terminal 2 is connected to a second grid G2 to which a positive voltage for accelerating the electron flow of the CRT 5 and adjusting the size and brightness of the bright spot on the screen is applied.
【００２７】可変抵抗ＶＲ２の一端は、また、デカップ
リングコンデンサＣ１の一端に接続され、デカップリン
グコンデンサＣ１の他端は、他端が接地されている抵抗
Ｒ５の一端と、可変直流バイアス電源Ｅ１の負側端子と
に接続され、可変直流バイアス電源Ｅ１の正側端子は、
ＣＲＴ５の電子ビームの輝点形状を補正する第３グリッ
ドＧ３に接続されている。One end of the variable resistor VR2 is connected to one end of a decoupling capacitor C1, and the other end of the decoupling capacitor C1 is connected to one end of a resistor R5 whose other end is grounded, and one end of a variable DC bias power supply E1. The positive terminal of the variable DC bias power supply E1 is connected to the negative terminal.
It is connected to a third grid G3 for correcting the shape of the bright spot of the electron beam on the CRT 5.
【００２８】また、水平パラボラ電圧発生回路１及び垂
直パラボラ電圧発生回路２の各出力は、それぞれ可変抵
抗ＶＲ５，ＶＲ６を通じて、加算回路１０が有するＯＰ
アンプＡＭＰ５の反転入力端子に与えられる。ＯＰアン
プＡＭＰ５は、非反転入力端子が接地され、抵抗Ｒ１６
により負帰還をかけられている。ＯＰアンプＡＭＰ５の
出力は、抵抗Ｒ６を通じてＯＰアンプＡＭＰ３の反転入
力端子に与えられる。ＯＰアンプＡＭＰ３は、抵抗Ｒ７
により負帰還をかけられ、非反転入力端子が接地されて
おり、抵抗Ｒ６と共に反転増幅回路７を構成している。The outputs of the horizontal parabola voltage generation circuit 1 and the vertical parabola voltage generation circuit 2 pass through variable resistors VR5 and VR6, respectively, to the OP
The signal is supplied to the inverting input terminal of the amplifier AMP5. The OP amplifier AMP5 has a non-inverting input terminal grounded, a resistor R16
Negative feedback has been applied by. The output of the OP amplifier AMP5 is supplied to the inverting input terminal of the OP amplifier AMP3 through the resistor R6. The OP amplifier AMP3 has a resistor R7
, The non-inverting input terminal is grounded, and forms an inverting amplifier 7 together with the resistor R6.
【００２９】ＯＰアンプＡＭＰ３の出力は、抵抗Ｒ８を
通じて増幅回路８が有するＯＰアンプＡＭＰ４の反転入
力端子に与えられる。増幅回路８は、可変抵抗ＶＲ７に
より負帰還をかけられ、非反転入力端子が接地されたＯ
ＰアンプＡＭＰ４からなる反転増幅回路である。The output of the operational amplifier AMP3 is supplied to the inverting input terminal of the operational amplifier AMP4 of the amplifier circuit 8 through the resistor R8. The amplifying circuit 8 receives a negative feedback by the variable resistor VR7, and the non-inverting input terminal is grounded.
This is an inverting amplifier circuit including a P amplifier AMP4.
【００３０】ＯＰアンプＡＭＰ４の出力端子は、他端が
接地された抵抗Ｒ１０の一端と、デカップリングコンデ
ンサＣ３の一端とに接続されている。デカップリングコ
ンデンサＣ３の他端は、他端が接地された抵抗Ｒ１１の
一端と、可変直流バイアス電源Ｅ３の正側端子とに接続
され、可変直流バイアス電源Ｅ３の負側端子には、ＣＲ
Ｔ５の輝度変調を行う第１グリッドＧ１に接続されてい
る。第１グリッドＧ１には、負の直流バイアス電圧が印
加され、電圧が高い程、輝度は上昇する。The output terminal of the OP amplifier AMP4 is connected to one end of a resistor R10 whose other end is grounded and one end of a decoupling capacitor C3. The other end of the decoupling capacitor C3 is connected to one end of a resistor R11 whose other end is grounded, and to the positive terminal of the variable DC bias power supply E3.
It is connected to the first grid G1 that performs the luminance modulation of T5. A negative DC bias voltage is applied to the first grid G1, and the higher the voltage, the higher the luminance.
【００３１】このような構成のＣＲＴ制御回路の動作を
以下に説明する。水平パラボラ電圧発生回路１が出力
し、水平偏向に同期して画面の中心部より周辺部の方が
電圧値が高くなるパラボラ波形の電圧信号と、垂直パラ
ボラ電圧発生回路２が出力し、垂直偏向に同期して画面
の中心部より周辺部の方が電圧値が高くなるパラボラ波
形の電圧信号とは、加算回路３により加算され反転され
る。The operation of the CRT control circuit having such a configuration will be described below. A horizontal parabola voltage generating circuit 1 outputs a parabolic waveform voltage signal in which the peripheral portion has a higher voltage value than a central portion of the screen in synchronization with horizontal deflection, and a vertical parabolic voltage generating circuit 2 outputs a vertical deflection voltage signal. And a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen in synchronism with.
【００３２】加算され反転されたパラボラ波形の電圧信
号は、増幅回路４により必要な振幅に迄反転増幅され、
デカップリングコンデンサＣ１を通じて、可変直流バイ
アス電源Ｅ１が出力する正の直流電圧に重畳され、ＣＲ
Ｔ５の第３グリッドＧ３に印加される。増幅回路４によ
り必要な振幅に迄反転増幅されたパラボラ波形の電圧信
号は、デカップリングコンデンサＣ２を通じて、可変直
流バイアス電源Ｅ２が出力する正の直流電圧に重畳さ
れ、ＣＲＴ５の第２グリッドＧ２に印加される。The added and inverted parabolic waveform voltage signal is inverted and amplified by the amplifier circuit 4 to a required amplitude.
Through the decoupling capacitor C1, the DC voltage is superimposed on the positive DC voltage output from the variable DC bias power supply E1.
The voltage is applied to the third grid G3 of T5. The parabolic waveform voltage signal inverted and amplified to the required amplitude by the amplifier circuit 4 is superimposed on the positive DC voltage output from the variable DC bias power supply E2 through the decoupling capacitor C2 and applied to the second grid G2 of the CRT 5. Is done.
【００３３】従って、第２グリッドＧ２及び第３グリッ
ドＧ３は、ＣＲＴ５の画面の中心部より周辺部の方が電
圧値が高いパラボラ波形の電圧信号を印加されている。
また、第３グリッドＧ３及び第２グリッドＧ２に印加さ
れるパラボラ波形の電圧信号は、可変抵抗ＶＲ１及び可
変抵抗ＶＲ２により、それぞれ個別にその振幅を調整す
ることができる。また、水平偏向に同期して画面の中心
部より周辺部の方が電圧値が高くなるパラボラ波形の電
圧信号、及び垂直偏向に同期して画面の中心部より周辺
部の方が電圧値が高くなるパラボラ波形の電圧信号も、
可変抵抗ＶＲ３及び可変抵抗ＶＲ４により、それぞれ個
別にその振幅を調整することができる。Therefore, the second grid G2 and the third grid G3 are applied with a voltage signal having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the screen of the CRT 5.
The amplitude of the parabolic waveform voltage signal applied to the third grid G3 and the second grid G2 can be individually adjusted by the variable resistors VR1 and VR2. Also, a parabolic waveform voltage signal in which the peripheral portion has a higher voltage value than the central portion of the screen in synchronization with horizontal deflection, and a peripheral portion has a higher voltage value than the central portion of the screen in synchronization with vertical deflection. The parabolic waveform voltage signal
The amplitude can be individually adjusted by the variable resistors VR3 and VR4.
【００３４】一方、水平パラボラ電圧発生回路１が出力
し、水平偏向に同期して画面の中心部より周辺部の方が
電圧値が高くなるパラボラ波形の電圧信号と、垂直パラ
ボラ電圧発生回路２が出力し、垂直偏向に同期して画面
の中心部より周辺部の方が電圧値が高くなるパラボラ波
形の電圧信号とは、加算回路１０によっても加算され反
転される。On the other hand, a voltage signal having a parabolic waveform which is output from the horizontal parabolic voltage generating circuit 1 and whose voltage value is higher in the peripheral portion than in the central portion of the screen in synchronization with horizontal deflection, and in the vertical parabolic voltage generating circuit 2 The output signal is also added and inverted by the adder circuit 10 with the parabolic waveform voltage signal in which the peripheral portion has a higher voltage value than the central portion of the screen in synchronization with the vertical deflection.
【００３５】加算回路１０により加算され反転されたパ
ラボラ波形の電圧信号は、反転増幅回路７により再度反
転される。反転増幅回路７により再度反転されたパラボ
ラ波形の電圧信号は、増幅回路８により必要な振幅に迄
再々度反転増幅され、デカップリングコンデンサＣ３を
通じて、可変直流バイアス電源Ｅ３が出力する直流電圧
に重畳され、ＣＲＴ５の第１グリッドＧ１に印加され
る。The parabolic waveform voltage signal added and inverted by the adding circuit 10 is again inverted by the inverting amplifier circuit 7. The parabolic waveform voltage signal inverted again by the inverting amplifier circuit 7 is again inverted and amplified to a required amplitude by the amplifier circuit 8, and is superimposed on the DC voltage output from the variable DC bias power supply E3 through the decoupling capacitor C3. , CRT5 to the first grid G1.
【００３６】従って、第１グリッドＧ１は、ＣＲＴ５の
画面の中心部より周辺部の方が電圧値が低いパラボラ波
形の電圧信号を印加されている。また、第１グリッドＧ
１に印加されるパラボラ波形の電圧信号は、可変抵抗Ｖ
Ｒ７により調整することができる。また、水平偏向に同
期して画面の中心部より周辺部の方が電圧値が低くなる
パラボラ波形の電圧信号、及び垂直偏向に同期して画面
の中心部より周辺部の方が電圧値が低くなるパラボラ波
形の電圧信号は、可変抵抗ＶＲ５及び可変抵抗ＶＲ６に
より、それぞれ個別にその振幅を調整することができ
る。Accordingly, the first grid G1 is applied with a parabolic waveform voltage signal having a lower voltage value at the peripheral portion than at the central portion of the screen of the CRT 5. Also, the first grid G
The parabolic waveform voltage signal applied to 1 is a variable resistor V
It can be adjusted by R7. Also, a parabolic waveform voltage signal whose voltage value is lower at the peripheral portion than at the central portion of the screen in synchronization with the horizontal deflection, and whose voltage value is lower at the peripheral portion than at the central portion of the screen in synchronization with the vertical deflection. The amplitude of the parabolic waveform voltage signal can be individually adjusted by the variable resistors VR5 and VR6.
【００３７】これらにより、第３グリッドＧ３と第２グ
リッドＧ２とは、ＣＲＴ５の画面の中心部から外れる程
高くなる電圧が印加され、第１グリッドＧ１には、ＣＲ
Ｔ５の画面の中心部から外れる程低くなる電圧が印加さ
れ、電子ビームに加える電圧条件の調整可能範囲が広が
るので、ＣＲＴ５の画面の周辺部の輝点形状を補正でき
ると共に、第２グリッドＧ２にパラボラ波形の電圧を印
加したことに起因する、画面の周辺部の輝度上昇も改善
される。As a result, a higher voltage is applied to the third grid G3 and the second grid G2 as the distance from the center of the screen of the CRT 5 increases, and a CR is applied to the first grid G1.
A voltage that becomes lower as the distance from the center of the screen of T5 is increased, and the adjustable range of the voltage condition applied to the electron beam is expanded. Therefore, the shape of the bright spot at the periphery of the screen of the CRT 5 can be corrected and the second grid G2 can be adjusted. The increase in luminance at the periphery of the screen due to the application of the parabolic waveform voltage is also improved.
【００３８】特に、第１グリッドＧ１には、ＣＲＴ５の
画面の中心部から外れる程低くなる電圧が印加されるの
で、第２グリッドＧ２及び第１グリッドＧ１間の電圧差
は、画面の中心部から外れる程大きくなり、輝点形状を
補正すると共に、カソードＫ及び第１グリッドＧ１間の
電圧差も、画面の中心部から外れる程大きくなる。従っ
て、図２に示すように、カットオフ条件（ヒータＨ、カ
ソードＫ及びグリッド群からなる電子銃からの輝点が画
面上から消えるときの、カソードＫ及び第１グリッドＧ
１間の電圧差と、第２グリッドＧ２及び第１グリッドＧ
１間の電圧差との関係）をＣＲＴ５の画面全体において
略一定に保つことにより、画面の周辺部の輝度上昇も改
善される。In particular, since a voltage that decreases as the distance from the center of the screen of the CRT 5 decreases is applied to the first grid G1, the voltage difference between the second grid G2 and the first grid G1 increases from the center of the screen. The larger the distance, the larger the bright spot shape is corrected, and the larger the voltage difference between the cathode K and the first grid G1 is, the larger the distance from the center of the screen is. Therefore, as shown in FIG. 2, the cut-off condition (the cathode K and the first grid G when the bright spot from the electron gun composed of the heater H, the cathode K and the grid group disappears from the screen).
1 and the second grid G2 and the first grid G
(The relationship with the voltage difference between 1) is kept substantially constant over the entire screen of the CRT 5, so that the increase in the luminance at the peripheral portion of the screen is also improved.
【００３９】また、第３グリッドＧ３、第２グリッドＧ
２及び第１グリッドＧ１に印加するパラボラ波形の電圧
と、直流バイアス電圧Ｅ１，Ｅ２，Ｅ３とを、それぞれ
個別に任意にまた連続的に変化させることができるの
で、ＣＲＴ５の画面全体において、輝点形状をきめ細か
く補正できると共に、ＣＲＴ５のカットオフ特性の個体
差も吸収できる。The third grid G3 and the second grid G
Since the voltage of the parabolic waveform applied to the second and first grids G1 and the DC bias voltages E1, E2, and E3 can be individually and continuously changed, respectively, the bright spots are displayed on the entire screen of the CRT 5. The shape can be finely corrected, and individual differences in the cut-off characteristics of the CRT 5 can be absorbed.
【００４０】実施の形態２．図３は、第２，４，５発明
に係るＣＲＴ制御回路の実施の形態の構成を示したブロ
ック図である。このＣＲＴ制御回路は、水平偏向に同期
して画面の中心部より周辺部（左右端部）の方が電圧値
が高くなるパラボラ波形の電圧信号を発生する水平パラ
ボラ電圧発生回路１と、垂直偏向に同期して画面の中心
部より周辺部（上下端部）の方が電圧値が高くなるパラ
ボラ波形の電圧信号を発生する垂直パラボラ電圧発生回
路２とを備えている。Embodiment 2 FIG. 3 is a block diagram showing the configuration of the embodiment of the CRT control circuit according to the second, fourth, and fifth inventions. The CRT control circuit includes a horizontal parabolic voltage generating circuit 1 that generates a parabolic waveform voltage signal in which a voltage value is higher in a peripheral portion (left and right end portions) than in a central portion of a screen in synchronization with horizontal deflection. And a vertical parabolic voltage generating circuit 2 for generating a parabolic waveform voltage signal having a higher voltage value at the peripheral portion (upper and lower end portions) than at the central portion of the screen.
【００４１】水平パラボラ電圧発生回路１及び垂直パラ
ボラ電圧発生回路２の各出力は、それぞれ可変抵抗ＶＲ
５，ＶＲ６を通じて、加算回路１０が有するＯＰアンプ
ＡＭＰ５の反転入力端子に与えられる。ＯＰアンプＡＭ
Ｐ５は、非反転入力端子が接地され、抵抗Ｒ１６により
負帰還をかけられている。ＯＰアンプＡＭＰ５の出力
は、抵抗Ｒ１２を通じて増幅回路９が有するＯＰアンプ
ＡＭＰ６の反転入力端子に与えられる。増幅回路９は、
可変抵抗ＶＲ１０により負帰還をかけられ、非反転入力
端子が接地されたＯＰアンプＡＭＰ６からなる反転増幅
回路である。Each output of the horizontal parabola voltage generation circuit 1 and the vertical parabola voltage generation circuit 2 is connected to a variable resistor VR.
5, VR6, and is supplied to an inverting input terminal of an OP amplifier AMP5 included in the adding circuit 10. OP amplifier AM
P5 has a non-inverting input terminal grounded and is negatively fed back by a resistor R16. The output of the operational amplifier AMP5 is supplied to the inverting input terminal of the operational amplifier AMP6 included in the amplifier circuit 9 through the resistor R12. The amplification circuit 9
This is an inverting amplifier circuit composed of an OP amplifier AMP6 that is negatively fed back by the variable resistor VR10 and whose non-inverting input terminal is grounded.
【００４２】ＯＰアンプＡＭＰ６の出力端子は、他端が
接地された抵抗Ｒ１４の一端と、デカップリングコンデ
ンサＣ６の一端とに接続されている。デカップリングコ
ンデンサＣ６の他端は、他端が接地された抵抗Ｒ１５の
一端と、可変直流バイアス電源Ｅ４の負側端子とに接続
されている。可変直流バイアス電源Ｅ４の正側端子は、
映像増幅回路１１内のＲｅｄ増幅回路とデカップリング
コンデンサＣ９により接続されたカラー用ＣＲＴ５ａの
Ｒｅｄ用のカソードに接続されている。The output terminal of the OP amplifier AMP6 is connected to one end of a resistor R14 whose other end is grounded and one end of a decoupling capacitor C6. The other end of the decoupling capacitor C6 is connected to one end of a resistor R15 whose other end is grounded, and to the negative terminal of the variable DC bias power supply E4. The positive terminal of the variable DC bias power supply E4 is
It is connected to the red cathode of the color CRT 5a connected to the red amplification circuit in the video amplification circuit 11 by the decoupling capacitor C9.
【００４３】上述したＲｅｄ用のカソードに、画面の中
心部より周辺部の方が電圧値が高いパラボラ波形の電圧
信号を印加する為の加算回路１０、増幅回路９、可変抵
抗ＶＲ５，ＶＲ６及び抵抗Ｒ１４は、Ｇｒｅｅｎ用及び
Ｂｌｕｅ用にもそれぞれ備えており、Ｇｒｅｅｎ用の増
幅回路９の出力端子（ＯＰアンプＡＭＰ６の出力端子）
は、デカップリングコンデンサＣ７の一端に接続されて
いる。デカップリングコンデンサＣ７の他端は、他端が
接地された抵抗Ｒ１６の一端と、可変直流バイアス電源
Ｅ５の負側端子とに接続されている。可変直流バイアス
電源Ｅ５の正側端子は、映像増幅回路１１内のＧｒｅｅ
ｎ増幅回路とデカップリングコンデンサＣ１０により接
続されたＧｒｅｅｎ用のカソードに接続されている。An adding circuit 10, an amplifying circuit 9, variable resistors VR5, VR6 and a resistor for applying a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen to the above-mentioned Red cathode. R14 is also provided for Green and Blue, respectively, and is an output terminal of an amplifier circuit 9 for Green (an output terminal of an OP amplifier AMP6).
Is connected to one end of the decoupling capacitor C7. The other end of the decoupling capacitor C7 is connected to one end of a resistor R16 whose other end is grounded, and to the negative terminal of the variable DC bias power supply E5. The positive terminal of the variable DC bias power supply E5 is connected to the Green in the video amplifier circuit 11.
It is connected to a Green cathode connected to the n-amplifying circuit and a decoupling capacitor C10.
【００４４】Ｂｌｕｅ用の増幅回路９の出力端子（ＯＰ
アンプＡＭＰ６の出力端子）は、デカップリングコンデ
ンサＣ８の一端に接続されている。デカップリングコン
デンサＣ８の他端は、他端が接地された抵抗Ｒ１７の一
端と、可変直流バイアス電源Ｅ６の負側端子とに接続さ
れている。可変直流バイアス電源Ｅ６の正側端子は、映
像増幅回路１１内のＢｌｕｅ増幅回路とデカップリング
コンデンサＣ１１により接続されたＢｌｕｅ用のカソー
ドに接続されている。The output terminal (OP) of the amplifier circuit 9 for Blue
The output terminal of the amplifier AMP6) is connected to one end of the decoupling capacitor C8. The other end of the decoupling capacitor C8 is connected to one end of a resistor R17 whose other end is grounded, and to the negative terminal of the variable DC bias power supply E6. The positive terminal of the variable DC bias power supply E6 is connected to a Blue amplifying circuit in the video amplifying circuit 11 and a Blue cathode connected by a decoupling capacitor C11.
【００４５】第１グリッドＧ１には、負の直流バイアス
電圧（図示せず）が印加され、電圧が高い程、輝度は上
昇する。第２グリッドＧ２及び第３グリッドＧ３に、画
面の中心部より周辺部の方が電圧値が高いパラボラ波形
の電圧信号を印加する為の加算回路３、増幅回路４及び
駆動回路６等の構成は、実施の形態１において説明した
ものと同様であるので、説明を省略する。A negative DC bias voltage (not shown) is applied to the first grid G1, and the higher the voltage, the higher the luminance. The configurations of the adder circuit 3, the amplifier circuit 4, the drive circuit 6, and the like for applying a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen to the second grid G2 and the third grid G3 are as follows. Since this is the same as that described in the first embodiment, description thereof will be omitted.
【００４６】このような構成のＣＲＴ制御回路の動作を
以下に説明する。水平パラボラ電圧発生回路１が出力
し、水平偏向に同期して画面の中心部より周辺部の方が
電圧値が高くなるパラボラ波形の電圧信号と、垂直パラ
ボラ電圧発生回路２が出力し、垂直偏向に同期して画面
の中心部より周辺部の方が電圧値が高くなるパラボラ波
形の電圧信号とは、Ｒｅｄ用、Ｇｒｅｅｎ用及びＢｌｕ
ｅ用のそれぞれの加算回路１０により加算され反転され
る。The operation of the CRT control circuit having such a configuration will be described below. A horizontal parabola voltage generating circuit 1 outputs a parabolic waveform voltage signal in which the peripheral portion has a higher voltage value than a central portion of the screen in synchronization with horizontal deflection, and a vertical parabolic voltage generating circuit 2 outputs a vertical deflection voltage signal. The parabolic waveform voltage signal whose peripheral portion has a higher voltage value than the central portion of the screen in synchronization with the red, green, and blue
e are added and inverted by the respective adders 10 for e.
【００４７】加算され反転されたパラボラ波形のそれぞ
れの電圧信号は、それぞれの増幅回路９により必要な振
幅に迄反転増幅され、デカップリングコンデンサＣ６，
Ｃ７，Ｃ８を通じて、可変直流バイアス電源Ｅ４，Ｅ
５，Ｅ６が出力する正の直流電圧にそれぞれ重畳され、
カラー用ＣＲＴ５ａのＲｅｄ用、Ｇｒｅｅｎ用及びＢｌ
ｕｅ用のそれぞれのカソードＫに印加される。Each of the added and inverted parabolic waveform voltage signals is inverted and amplified to a required amplitude by each amplifier circuit 9, and the decoupling capacitors C6 and C6 are used.
Variable DC bias power supplies E4, E through C7 and C8
5, E6 are superimposed on the positive DC voltage output respectively,
Color CRT5a for Red, Green and Bl
ue is applied to each cathode K.
【００４８】従って、カラー用ＣＲＴ５ａのＲｅｄ用、
Ｇｒｅｅｎ用及びＢｌｕｅ用のそれぞれのカソードＫ
は、カラー用ＣＲＴ５ａの画面の中心部より周辺部の方
が電圧値が高くなるパラボラ波形の電圧信号を印加され
ている。また、水平偏向に同期して画面の中心部より周
辺部の方が電圧値が低くなるパラボラ波形の電圧信号、
及び垂直偏向に同期して画面の中心部より周辺部の方が
電圧値が低くなるパラボラ波形の電圧信号は、Ｒｅｄ
用、Ｇｒｅｅｎ用及びＢｌｕｅ用のそれぞれの可変抵抗
ＶＲ５及び可変抵抗ＶＲ６により、個別にその振幅を調
整することができる。第２グリッドＧ２及び第３グリッ
ドＧ３に、画面の中心部より周辺部の方が電圧値が高い
パラボラ波形の電圧信号を印加する為の加算回路３、増
幅回路４及び駆動回路６等の動作は、実施の形態１にお
いて説明したものと同様であるので、説明を省略する。Therefore, for the color CRT 5a for Red,
Each cathode K for Green and Blue
Is applied with a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen of the color CRT 5a. In addition, a voltage signal having a parabolic waveform in which the peripheral portion has a lower voltage value than the central portion of the screen in synchronization with the horizontal deflection,
And a parabolic waveform voltage signal in which the voltage value is lower at the peripheral part than at the central part of the screen in synchronization with the vertical deflection is Red
, Green, and Blue variable resistors VR5 and VR6 can individually adjust the amplitude. The operations of the addition circuit 3, the amplification circuit 4, the drive circuit 6, and the like for applying a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the screen to the second grid G2 and the third grid G3 are as follows. Since this is the same as that described in the first embodiment, description thereof will be omitted.
【００４９】これにより、カラー用ＣＲＴ５ａのＲｅｄ
用、Ｇｒｅｅｎ用及びＢｌｕｅ用の各カソード及び第１
グリッドＧ１間の電圧分布を、第１グリッドＧ１にＣＲ
Ｔ画面の中心部より周辺部の方が電圧値が低いパラボラ
波形の電圧信号を印加する場合と同様にすることがで
き、ＣＲＴ画面の中心部より周辺部の方が電圧値が高い
パラボラ波形の電圧信号のみでなく、周辺部の方が電圧
値が低いパラボラ波形の電圧信号も、電子ビームに加え
ることと同様のことができ、電子ビームに加える電圧条
件の調整可能範囲が広がるので、画面の周辺部の輝点形
状を補正すると共に、第２グリッドＧ２にパラボラ波形
の電圧を印加したことに起因する、画面の周辺部の輝度
上昇も改善することができる。Thus, the Red of the color CRT 5a is
, Green and Blue cathodes and first
The voltage distribution between the grids G1 is represented by CR in the first grid G1.
This can be performed in the same manner as when a parabolic waveform voltage signal having a lower voltage value is applied to the peripheral portion than to the central portion of the T screen. In addition to the voltage signal, a parabolic waveform voltage signal whose peripheral portion has a lower voltage value can be applied to the electron beam in the same manner, and the adjustable range of the voltage condition applied to the electron beam is expanded. In addition to correcting the shape of the bright spots in the peripheral portion, it is also possible to improve the increase in luminance at the peripheral portion of the screen due to the application of the parabolic waveform voltage to the second grid G2.
【００５０】また、各カソードＫ及び第１グリッドＧ１
間の電圧差は、画面の中心部から外れる程大きくなるの
で、図３に示すように、カットオフ条件をカラー用ＣＲ
Ｔ５ａの画面全体において略一定に保つことにより、画
面の周辺部の輝度上昇も改善される。また、各カソード
Ｋに印加するパラボラ波形の電圧と、各カソードＫの直
流バイアス電圧Ｅ４，Ｅ５，Ｅ６とを、それぞれ個別に
任意にまた連続的に変化させることができるので、カラ
ー用ＣＲＴ５の画面全体において、輝点形状をきめ細か
く補正できると共に、カラー用ＣＲＴ５ａのカットオフ
特性の個体差も吸収できる。Each cathode K and the first grid G1
Since the voltage difference between the two becomes larger as the distance from the center of the screen increases, as shown in FIG.
By maintaining substantially constant over the entire screen at T5a, the increase in brightness at the periphery of the screen is also improved. In addition, since the voltage of the parabolic waveform applied to each cathode K and the DC bias voltages E4, E5, E6 of each cathode K can be individually and continuously changed individually, the screen of the color CRT 5 can be changed. As a whole, the bright spot shape can be finely corrected, and individual differences in cutoff characteristics of the color CRT 5a can be absorbed.
【００５１】実施の形態３．図４は、第６発明に係る受
像機の実施の形態の構成を示すブロック図である。この
受像機は、カラーテレビジョン受像機であり、アンテナ
３０により受信されたカラーテレビジョン電波は、チュ
ーナ３１により選択増幅されると共に、中間周波信号に
変換され、映像中間周波増幅・検波回路３２へ送られ
る。中間周波信号は、映像中間周波増幅・検波回路３２
で増幅され、カラーテレビジョン信号と音声中間周波信
号とに分離される。音声中間周波信号は、音声中間周波
増幅回路３８で増幅された後、音声検波増幅回路３９に
より音声信号が検波増幅され、スピーカ４０から出力さ
れる。Embodiment 3 FIG. FIG. 4 is a block diagram showing a configuration of an embodiment of a receiver according to the sixth invention. This receiver is a color television receiver, and a color television wave received by an antenna 30 is selectively amplified by a tuner 31, converted into an intermediate frequency signal, and sent to a video intermediate frequency amplification / detection circuit 32. Sent. The intermediate frequency signal is supplied to a video intermediate frequency amplification / detection circuit 32.
And is separated into a color television signal and an audio intermediate frequency signal. After the audio intermediate frequency signal is amplified by the audio intermediate frequency amplification circuit 38, the audio signal is detected and amplified by the audio detection amplification circuit 39 and output from the speaker 40.
【００５２】カラーテレビジョン信号は、映像増幅回路
３３で増幅された後、搬送色信号Ｃ及び輝度信号Ｙに分
離され、搬送色信号Ｃは色信号再生回路３４へ送られ、
輝度信号Ｙは輝度信号増幅回路３５及び同期・偏向回路
３６へ送られる。色信号再生回路３４では、搬送色信号
Ｃから色差信号Ｒ−Ｙ，Ｇ−Ｙ，Ｂ−Ｙが再生出力され
る。色差信号Ｒ−Ｙ，Ｇ−Ｙ，Ｂ−Ｙは、輝度信号増幅
回路３５で増幅された輝度信号Ｙがそれぞれ加算され
て、色信号Ｒ，Ｇ，Ｂとなって、ＣＲＴ５へ入力され
る。ＣＲＴ５では、色信号Ｒ，Ｇ，Ｂは、それぞれの強
さに応じた電子ビームとなる。また、同期・偏向回路３
６は、垂直同期信号と水平同期信号とをＣＲＴ制御回路
３７へ与える。その他の構成及び動作は、実施の形態１
で説明したＣＲＴ制御回路及びＣＲＴ５の構成及び動作
と同様なので、説明を省略する。After the color television signal is amplified by the video amplifier circuit 33, it is separated into the carrier chrominance signal C and the luminance signal Y, and the carrier chrominance signal C is sent to the chrominance signal reproduction circuit 34.
The luminance signal Y is sent to the luminance signal amplification circuit 35 and the synchronization / deflection circuit 36. The color signal reproducing circuit 34 reproduces and outputs the color difference signals RY, GY and BY from the carrier color signal C. The luminance signals Y amplified by the luminance signal amplifying circuit 35 are added to the color difference signals R-Y, G-Y, and B-Y, respectively, and are added to the CRT 5 as color signals R, G, and B. In the CRT 5, the color signals R, G, and B are electron beams corresponding to the respective intensities. In addition, the synchronization / deflection circuit 3
6 supplies a vertical synchronizing signal and a horizontal synchronizing signal to the CRT control circuit 37. Other configurations and operations are described in Embodiment 1.
Since the configuration and operation of the CRT control circuit and the CRT 5 are the same as those described above, the description is omitted.
【００５３】これにより、ＣＲＴ５のカソードは、ＣＲ
Ｔ５の画面の中心部から外れる程高い電圧が印加され、
電子ビームが減速されるので、ＣＲＴ５の画面の周辺部
の輝点形状を補正すると共に、第２グリッドＧ２にパラ
ボラ波形の電圧を印加したことに起因する、画面の周辺
部の輝度上昇も改善される。また、カソードＫ及び第１
グリッドＧ１間の電圧差は、画面の中心部から外れる程
大きくなるので、図２に示すように、カットオフ条件を
ＣＲＴ５の画面全体において略一定に保つことにより、
画面の周辺部の輝度上昇も改善される。Thus, the cathode of the CRT 5 is CR
A higher voltage is applied so as to deviate from the center of the screen of T5,
Since the electron beam is decelerated, the bright spot shape at the periphery of the screen of the CRT 5 is corrected, and the increase in brightness at the periphery of the screen due to the application of the parabolic waveform voltage to the second grid G2 is also improved. You. Further, the cathode K and the first
Since the voltage difference between the grids G1 increases as the distance from the center of the screen increases, as shown in FIG. 2, by keeping the cutoff condition substantially constant over the entire screen of the CRT 5,
The increase in brightness at the periphery of the screen is also improved.
【００５４】[0054]
【発明の効果】第１発明に係るＣＲＴ制御回路によれ
ば、第１グリッド電圧印加回路が、第１グリッドに、Ｃ
ＲＴ画面の中心部より周辺部の方が電圧値が低いパラボ
ラ波形の電圧信号を印加し、第２グリッド及び第３グリ
ッド電圧印加回路が、第２グリッド及び第３グリッド
に、ＣＲＴ画面の中心部より周辺部の方が電圧値が高い
パラボラ波形の互いに異なる電圧信号を印加する。これ
により、ＣＲＴ画面の中心部より周辺部の方が電圧値が
高いパラボラ波形の電圧信号のみでなく、周辺部の方が
電圧値が低いパラボラ波形の電圧信号も、電子ビームに
加えることができ、電子ビームに加える電圧条件の調整
可能範囲が広がるので、ＣＲＴ画面の周辺部の輝度を上
昇させることなく、輝点形状の歪みを補正し、均一なフ
ォーカスを得ることができる。According to the CRT control circuit according to the first invention, the first grid voltage application circuit includes a C
A voltage signal having a parabolic waveform having a lower voltage value in the peripheral portion than in the central portion of the RT screen is applied, and the second grid and the third grid voltage applying circuit apply the central portion of the CRT screen to the second grid and the third grid. Different voltage signals having parabolic waveforms with higher voltage values at the peripheral portion are applied. As a result, not only a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the central portion of the CRT screen, but also a parabolic waveform voltage signal having a lower voltage value at the peripheral portion can be applied to the electron beam. Since the adjustable range of the voltage condition applied to the electron beam is widened, it is possible to correct the distortion of the bright spot shape and obtain a uniform focus without increasing the brightness of the peripheral portion of the CRT screen.
【００５５】第２発明に係るＣＲＴ制御回路によれば、
カソード電圧印加回路が、カソードに、ＣＲＴの画面の
中心部より周辺部の方が電圧値が高いパラボラ波形の電
圧信号を印加し、第２グリッド及び第３グリッド電圧印
加回路が、第２グリッド及び第３グリッドに、ＣＲＴの
画面の中心部より周辺部の方が電圧値が高いパラボラ波
形の互いに異なる電圧信号を印加するので、カソード及
び第１グリッド間の電圧分布を、第１グリッドにＣＲＴ
画面の中心部より周辺部の方が電圧値が低いパラボラ波
形の電圧信号を印加する場合と同様にすることができ、
ＣＲＴ画面の中心部より周辺部の方が電圧値が高いパラ
ボラ波形の電圧信号のみでなく、周辺部の方が電圧値が
低いパラボラ波形の電圧信号も、電子ビームに加えるこ
とと同様のことができ、電子ビームに加える電圧条件の
調整可能範囲が広がるので、ＣＲＴ画面の周辺部の輝度
を上昇させることなく、輝点形状の歪みを補正し、均一
なフォーカスを得ることができる。According to the CRT control circuit of the second invention,
A cathode voltage application circuit applies a parabolic waveform voltage signal having a higher voltage value at a peripheral portion than at a central portion of a CRT screen to a cathode, and a second grid and a third grid voltage application circuit apply a second grid and a third grid voltage to the cathode. Since different voltage signals having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the screen of the CRT are applied to the third grid, the voltage distribution between the cathode and the first grid is represented by the CRT on the first grid.
The same applies to the case of applying a parabolic waveform voltage signal in which the peripheral portion has a lower voltage value than the central portion of the screen,
In addition to a parabolic waveform voltage signal having a higher voltage value at the peripheral portion than at the center portion of the CRT screen, a parabolic waveform voltage signal having a lower voltage value at the peripheral portion is similar to that applied to the electron beam. As a result, the adjustable range of the voltage condition applied to the electron beam is widened, so that the bright spot shape distortion can be corrected and uniform focus can be obtained without increasing the brightness of the peripheral portion of the CRT screen.
【００５６】第３発明に係るＣＲＴ制御回路によれば、
可変手段がパラボラ波形の電圧信号の電圧値を連続的に
変化させることができるので、ＣＲＴの画面全体におい
て、輝点形状の歪みをきめ細かく補正することができ
る。According to the CRT control circuit according to the third invention,
Since the variable means can continuously change the voltage value of the voltage signal having the parabolic waveform, it is possible to finely correct the distortion of the bright spot shape on the entire screen of the CRT.
【００５７】第４発明に係るＣＲＴ制御回路によれば、
Ｒ，Ｇ，Ｂ用の各カソード電圧印加回路が、Ｒ，Ｇ，Ｂ
用の各カソードに、カラー用ＣＲＴの画面の中心部より
周辺部の方が電圧値が高いパラボラ波形の電圧信号をそ
れぞれ印加し、第２グリッド及び第３グリッド電圧印加
回路が、第２グリッド及び第３グリッドに、カラー用Ｃ
ＲＴの画面の中心部より周辺部の方が電圧値が高いパラ
ボラ波形の電圧信号を印加するので、各カソード及び第
１グリッド間の電圧分布を、第１グリッドにＣＲＴ画面
の中心部より周辺部の方が電圧値が低いパラボラ波形の
電圧信号を印加する場合と同様にすることができ、ＣＲ
Ｔ画面の中心部より周辺部の方が電圧値が高いパラボラ
波形の電圧信号のみでなく、周辺部の方が電圧値が低い
パラボラ波形の電圧信号も、電子ビームに加えることと
同様のことができ、電子ビームに加える電圧条件の調整
可能範囲が広がるので、ＣＲＴ画面の周辺部の輝度を上
昇させることなく、輝点形状の歪みを補正し、均一なフ
ォーカスを得ることができる。According to the CRT control circuit of the fourth invention,
Each of the cathode voltage application circuits for R, G, B
A voltage signal having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the screen of the color CRT is applied to each of the cathodes for color, and the second grid and the third grid voltage applying circuit respectively operate the second grid and the third grid. In the third grid, C for color
Since a voltage signal having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the RT screen is applied, the voltage distribution between each cathode and the first grid is changed to the first grid at the peripheral portion from the central portion of the CRT screen. Can be the same as the case of applying a parabolic waveform voltage signal having a lower voltage value.
Similar to applying a parabolic waveform voltage signal with a lower voltage value to the electron beam, as well as a parabolic waveform voltage signal with a higher voltage value at the peripheral portion than at the center of the T screen, As a result, the adjustable range of the voltage condition applied to the electron beam is widened, so that the bright spot shape distortion can be corrected and uniform focus can be obtained without increasing the brightness of the peripheral portion of the CRT screen.
【００５８】第５発明に係るＣＲＴ制御回路によれば、
Ｒ，Ｇ，Ｂ用の各カソード電圧印加回路と第２グリッド
及び第３グリッド電圧印加回路とは、各別に備えている
可変手段により、印加する電圧信号の電圧値を連続的に
変化させることができるので、ＣＲＴの画面全体におい
て、Ｒ，Ｇ，Ｂ毎の輝点形状の歪みをきめ細かく補正す
ることができる。According to the CRT control circuit of the fifth invention,
Each of the cathode voltage application circuits for R, G, and B and the second grid and third grid voltage application circuits can continuously change the voltage value of the applied voltage signal by a variable means provided separately. Therefore, the distortion of the bright spot shape for each of R, G, and B can be finely corrected over the entire screen of the CRT.
【００５９】第６発明に係る受像機によれば、請求項１
〜５の何れかに記載されたＣＲＴ制御回路を備えるの
で、ＣＲＴ画面の周辺部の輝度を上昇させることなく、
輝点形状の歪みを補正し、均一なフォーカスを得ること
ができる。According to the sixth aspect of the present invention, there is provided a television receiver according to the first aspect.
Since the CRT control circuit described in any one of (1) to (5) is provided, without increasing the brightness of the peripheral portion of the CRT screen,
It is possible to correct the distortion of the bright spot shape and obtain a uniform focus.
【図１】 本発明に係るＣＲＴ制御回路の実施の形態の
構成を示したブロック図である。FIG. 1 is a block diagram showing a configuration of an embodiment of a CRT control circuit according to the present invention.
【図２】 ＣＲＴのカットオフ条件の例を示したグラフ
である。FIG. 2 is a graph showing an example of a CRT cut-off condition.
【図３】 本発明に係るＣＲＴ制御回路の実施の形態の
構成を示したブロック図である。FIG. 3 is a block diagram showing a configuration of an embodiment of a CRT control circuit according to the present invention.
【図４】 本発明に係る受像機の実施の形態の構成を示
すブロック図である。FIG. 4 is a block diagram showing a configuration of an embodiment of a receiver according to the present invention.
【図５】 従来のＣＲＴ制御回路の構成例を示したブロ
ック図である。FIG. 5 is a block diagram showing a configuration example of a conventional CRT control circuit.
１ 水平パラボラ電圧発生回路（第１グリッド電圧印加
回路、第２グリッド及び第３グリッド電圧印加回路、カ
ソード電圧印加回路）、２ 垂直パラボラ電圧発生回路
（第１グリッド電圧印加回路、第２グリッド及び第３グ
リッド電圧印加回路、カソード電圧印加回路）、３ 加
算回路（第２グリッド及び第３グリッド電圧印加回
路）、４ 増幅回路（第２グリッド及び第３グリッド電
圧印加回路）、５ ＣＲＴ、５ａ カラー用ＣＲＴ、６
駆動回路（第２グリッド及び第３グリッド電圧印加回
路）、７，８ 増幅回路（第１グリッド電圧印加回
路）、９ 増幅回路（カソード電圧印加回路）、１０
加算回路（第１グリッド電圧印加回路、カソード電圧印
加回路）、１１ 映像増幅回路、３７ ＣＲＴ制御回
路、Ｅ１〜Ｅ６ 可変直流バイアス電源、Ｇ１ 第１グ
リッド、Ｇ２ 第２グリッド、Ｇ３ 第３グリッド、Ｋ
カソード、ＶＲ１〜ＶＲ７，ＶＲ１０ 可変抵抗。1 horizontal parabola voltage generation circuit (first grid voltage application circuit, second grid and third grid voltage application circuit, cathode voltage application circuit), 2 vertical parabola voltage generation circuit (first grid voltage application circuit, second grid and second grid voltage application circuit) 3 grid voltage application circuit, cathode voltage application circuit), 3 addition circuit (second grid and third grid voltage application circuit), 4 amplification circuit (second grid and third grid voltage application circuit), 5 CRT, 5a color CRT, 6
Driving circuit (second grid and third grid voltage applying circuit), 7, 8 amplifying circuit (first grid voltage applying circuit), 9 amplifying circuit (cathode voltage applying circuit), 10
Addition circuit (first grid voltage application circuit, cathode voltage application circuit), 11 video amplification circuit, 37 CRT control circuit, E1-E6 variable DC bias power supply, G1 first grid, G2 second grid, G3 third grid, K
Cathode, VR1 to VR7, VR10 Variable resistance.
Claims (6)
ドに、前記ＣＲＴ画面の中心部より周辺部の方が電圧値
が低いパラボラ波形の電圧信号を印加する第１グリッド
電圧印加回路と、ＣＲＴ画面における輝点の大きさ及び
輝度を調整する第２グリッドと輝点形状を補正する第３
グリッドとに、前記ＣＲＴ画面の中心部より周辺部の方
が電圧値が高いパラボラ波形の互いに異なる電圧信号を
印加する第２グリッド及び第３グリッド電圧印加回路と
を備えることを特徴とするＣＲＴ制御回路。1. A first grid voltage application circuit for applying a parabolic waveform voltage signal having a lower voltage value at a peripheral portion than at a central portion of the CRT screen to a first grid for performing luminance modulation of the CRT screen, and a CRT. A second grid for adjusting the size and brightness of the bright spot on the screen and a third grid for correcting the shape of the bright spot
CRT control, comprising: a grid and a second grid and a third grid voltage application circuit for applying different voltage signals having a parabolic waveform having a higher voltage value at a peripheral portion than at a central portion of the CRT screen. circuit.
中心部より周辺部の方が電圧値が高いパラボラ波形の電
圧信号を印加するカソード電圧印加回路と、ＣＲＴ画面
における輝点の大きさ及び輝度を調整する第２グリッド
と輝点形状を補正する第３グリッドとに、前記ＣＲＴの
画面の中心部より周辺部の方が電圧値が高いパラボラ波
形の互いに異なる電圧信号を印加する第２グリッド及び
第３グリッド電圧印加回路とを備えることを特徴とする
ＣＲＴ制御回路。2. A cathode voltage application circuit for applying a voltage signal having a parabolic waveform having a higher voltage value at a peripheral portion than at a central portion of a screen of the CRT to a cathode of the CRT; A second grid for applying different voltage signals of parabolic waveforms having a higher voltage value at the peripheral portion than at the central portion of the CRT screen to the second grid for adjusting the luminance and the third grid for correcting the bright spot shape. And a third grid voltage application circuit.
的に変化させる可変手段を備える請求項１又は２記載の
ＣＲＴ制御回路。3. The CRT control circuit according to claim 1, further comprising variable means for continuously changing the voltage value of the voltage signal having a parabolic waveform.
ードに、該カラー用ＣＲＴの画面の中心部より周辺部の
方が電圧値が高いパラボラ波形の電圧信号をそれぞれ印
加するＲ，Ｇ，Ｂ用の各カソード電圧印加回路と、カラ
ー用ＣＲＴ画面における輝点の大きさ及び輝度を調整す
る第２グリッドと輝点形状を補正する第３グリッドと
に、前記カラー用ＣＲＴの画面の中心部より周辺部の方
が電圧値が高いパラボラ波形の互いに異なる電圧信号を
印加する第２グリッド及び第３グリッド電圧印加回路と
を備えることを特徴とするＣＲＴ制御回路。4. A voltage signal having a parabolic waveform having a higher voltage value at the peripheral portion than at the central portion of the screen of the color CRT is applied to each of the R, G, and B cathodes of the color CRT. Each of the cathode voltage application circuits for G and B, a second grid for adjusting the size and brightness of the bright spot on the CRT screen for color, and a third grid for correcting the shape of the bright spot are provided on the screen of the CRT for color. A CRT control circuit, comprising: a second grid and a third grid voltage application circuit for applying different voltage signals having a parabolic waveform having a higher voltage value at a peripheral portion than at a central portion.
と第２グリッド及び第３グリッド電圧印加回路とは、印
加する電圧信号の電圧値を連続的に変化させる可変手段
を各別に備える請求項４記載のＣＲＴ制御回路。5. The cathode voltage application circuits for R, G, and B, and the second grid and third grid voltage application circuits each include a variable means for continuously changing a voltage value of a voltage signal to be applied. The CRT control circuit according to claim 4.
Ｔ制御回路を備えることを特徴とする受像機。6. A CR according to any one of claims 1 to 5,
A receiver comprising a T control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16135197A JPH118778A (en) | 1997-06-18 | 1997-06-18 | Crt control circuit and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16135197A JPH118778A (en) | 1997-06-18 | 1997-06-18 | Crt control circuit and receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH118778A true JPH118778A (en) | 1999-01-12 |
Family
ID=15733438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16135197A Pending JPH118778A (en) | 1997-06-18 | 1997-06-18 | Crt control circuit and receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH118778A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1370080A1 (en) * | 2002-02-08 | 2003-12-10 | Vestel Elektronik AS | Apparatus and method for displaying images on a cathode ray tube |
-
1997
- 1997-06-18 JP JP16135197A patent/JPH118778A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1370080A1 (en) * | 2002-02-08 | 2003-12-10 | Vestel Elektronik AS | Apparatus and method for displaying images on a cathode ray tube |
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