JPH02153680A - Video amplifier circuit - Google Patents

Video amplifier circuit

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Publication number
JPH02153680A
JPH02153680A JP63308199A JP30819988A JPH02153680A JP H02153680 A JPH02153680 A JP H02153680A JP 63308199 A JP63308199 A JP 63308199A JP 30819988 A JP30819988 A JP 30819988A JP H02153680 A JPH02153680 A JP H02153680A
Authority
JP
Japan
Prior art keywords
circuit
vertical
horizontal
parabolic
scanning period
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
JP63308199A
Other languages
Japanese (ja)
Inventor
Kazuyuki Seko
瀬古 一行
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.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP63308199A priority Critical patent/JPH02153680A/en
Publication of JPH02153680A publication Critical patent/JPH02153680A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To correct difference of luminance between the center part and the peripheral part of the picture of a CRT by generating and synthesizing the vertical and horizontal parabolic waves of specific waveform, and setting an amplification degree for a video signal at the lowest level at the intermediate of each scanning period by a synthesized wave. CONSTITUTION:A vertical parabolic wave formation circuit 2 which generates the vertical parabolic wave V1 of parabolic waveform projecting downward being set at the lowest level at the intermediate of each vertical scanning period at every vertical scan by the output signal of a vertical output circuit 1, a horizontal parabolic wave formation circuit 4 which generates the horizontal parabolic wave V2 of parabolic waveform projecting downward being set at the lowest level at the intermediate of each horizontal scanning period at every horizontal scan by the output signal of a horizontal output circuit 3, and a synthesis circuit 5 which synthesizes those output signals V1 and V2 are provided. And control to set the amplification degree for the video signal so as to be set at the lowest level at the intermediate of each vertical and horizontal scanning period according to the output signal of the synthesis circuit 5 is performed. In such a way, it is possible to obtain the same luminance at the entire picture of the CRT.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はビデオ増幅回路に関し、特にCRTデイスプレ
ィ装置におけるアナログKGBビデオ信号を増幅するビ
デオ増幅回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video amplifier circuit, and more particularly to a video amplifier circuit for amplifying analog KGB video signals in a CRT display device.

〔従来の技術〕[Conventional technology]

従来のこの種のビデオ増幅回路としては、例えはトラン
ジスタ技術、1985年10月号、407頁図1に示さ
れるような構成のものがある。
A conventional video amplifier circuit of this type has a configuration as shown in FIG. 1 on page 407 of Transistor Technology, October 1985 issue.

この回路は、第7図に示すように、コントラスト制御回
路6Atゲイン調整回路7.直流再生回路8.ビデオ出
力回路9.カットオフ調整回路10及びコンデンサC,
,C,により構成さnている。
As shown in FIG. 7, this circuit includes a contrast control circuit 6At, a gain adjustment circuit 7. DC regeneration circuit 8. Video output circuit9. cutoff adjustment circuit 10 and capacitor C,
,C,.

アナログKGBビデオ信号(μ下映像信号という)Vx
Nelコントラスト制御回路6Aに加えられ、コントラ
ストボリュームによりユーザー側でコントラストを制御
できるように、ここで増幅度を調整する。
Analog KGB video signal (referred to as μ-lower video signal) Vx
It is added to the Nel contrast control circuit 6A, and the amplification degree is adjusted here so that the user can control the contrast using a contrast volume.

ゲイン調整回路7は、CI(、T画面上で良好な白を再
現するため、几、U、B信号独立に岸幅度を調整する回
路であ夛、コンデンサC6で直流分を取シ除き直流再生
回路8で直流分を忠実に再生する。
The gain adjustment circuit 7 is a circuit that adjusts the bank width independently of the 几, U, and B signals in order to reproduce good white on the CI (T) screen. Circuit 8 faithfully reproduces the DC component.

さらにビデオ出力回路9で約40 vp−p に増幅し
てもう一度コンデンサC6で直流分を取シ除き、力、ト
オフ調整回路lOでカットオフを調整し、出力信号VO
U丁がCRTのカンードに印加される。
Furthermore, the video output circuit 9 amplifies the voltage to about 40 vp-p, removes the DC component once again with the capacitor C6, and adjusts the cutoff with the power and to-off adjustment circuit 1O to output the output signal VO.
A signal U is applied to the CRT.

このビデオ増幅回路の増幅度は走査位置に関係なく同一
の増幅率となっている。
The amplification factor of this video amplifier circuit is the same regardless of the scanning position.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

一般に、CRTの画面上で、中央部と周辺部に全く同一
の輝度を得る目的でC)t、Tのカンードに走査位置に
関係なく同一の電圧を加えると、CRT独自の特性上の
問題で中央部と周辺部の輝度は同じにならず、中央部は
明るく周辺部は暗くなってしまう。
Generally speaking, if the same voltage is applied to the C)t and T candos regardless of the scanning position in order to obtain exactly the same brightness at the center and periphery of a CRT screen, this will result in problems due to the unique characteristics of CRTs. The brightness of the center and the periphery are not the same; the center is bright and the periphery is dark.

上述した従来のビデオ増幅回路は、走査位置に関係なく
増幅率は同一になっているので、CRTの画面上で中央
部の表示は明るく周辺部の表示は暗くなるという欠点が
ある。
The conventional video amplification circuit described above has the same amplification factor regardless of the scanning position, so it has the disadvantage that the display at the center on the CRT screen is bright and the display at the periphery is dark.

本発明の目的は、(、RT画面上における中央部と周辺
部の輝度差を補正することができるビデオ増幅回路を提
供することにある。
An object of the present invention is to provide a video amplifier circuit that can correct the difference in brightness between the center and peripheral areas on an RT screen.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のビデオ増幅回路は、各垂直走査ごとに、これら
各垂直走査期間の中間で最低となる下に凸の放物線状の
波形の垂直パラボラ波を発生する垂直パラホラ波形成回
路と、各水平走査ごとに、これら各水平走査期間の中間
で最低となる下に凸の放物線状の波形の水平パラボラ波
を発生する水平バラボラ波形成回路と、前記垂直パラボ
ラ波形成回路の出力信号及び前記水平パラボラ波形成回
路の出力信号を合成する合成回路と、この合成回路の出
力信号に従って映像信号に対する増幅度を、前記各垂直
走査期間及び各水平走査期間の中間で最低になるように
制御する増幅部とを有している。
The video amplifier circuit of the present invention includes a vertical parabolic waveforming circuit that generates a vertical parabolic wave having a downwardly convex parabolic waveform that reaches its lowest point in the middle of each vertical scanning period, and a horizontal parabolic wave forming circuit that generates a horizontal parabolic wave with a downwardly convex parabolic waveform that reaches its lowest point in the middle of each horizontal scanning period, and an output signal of the vertical parabolic wave forming circuit and the horizontal parabolic wave. a synthesis circuit for synthesizing the output signals of the formation circuit; and an amplification section for controlling the amplification degree of the video signal in accordance with the output signal of the synthesis circuit so that it becomes the lowest in the middle of each vertical scanning period and each horizontal scanning period. have.

〔実施例〕〔Example〕

次に、本発明の実施例について図面を参照して説明する
Next, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明の第1の実施例を示す回路図である。FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

この実施例は、既設の垂直出力回路lの出力信号により
、各垂直走査ごとに、これら各垂直走査期間の中間で最
低となる下に凸の放物線状の波形の垂直パラボラ波(■
りを発生する垂直パラボラ波形成回路2と、既設の水平
出力回路3の出力信号によシ、各水平走査ととKこれら
各水平走査期間の中間で最低となる下に凸の放物線状の
波形の水平パラボラ波(V宜)を発生する水平パラボラ
波形成回路4と、コンデンサC1〜C3及び抵抗R1を
備え、垂直パラボラ波形成回路2の出力信号■1及び水
平パラボラ波形成回路4の出力信号■雪を合成する合成
回路5と、トランジスタQs −Qs 。
In this embodiment, the output signal of the existing vertical output circuit l is used to generate a vertical parabolic wave (■
According to the output signals of the vertical parabolic waveforming circuit 2, which generates the curvature, and the existing horizontal output circuit 3, a downwardly convex parabolic waveform is created with the lowest point in the middle of each horizontal scanning period. It is equipped with a horizontal parabolic wave forming circuit 4 that generates a horizontal parabolic wave (V), capacitors C1 to C3, and a resistor R1. ■Synthesizing circuit 5 for synthesizing snow and transistors Qs-Qs.

コンデンサC4及び抵抗kL1〜ルアを備え、合成回路
5の出力信号v3に従って増幅度を、各垂直走査期間及
び各水平走査期間の中間で最低になるように制御して、
入力された映像信号VINを増幅するコントラスト制御
回路6と、既設のゲイン調整回路7.直流再成回路8.
ビデオ出力回路9゜力、トオフ調整回路lO及びコンデ
ンサC5+C1lとを有する構成となっている。
It includes a capacitor C4 and a resistor kL1 to Lua, and controls the amplification degree to be the lowest in the middle of each vertical scanning period and each horizontal scanning period according to the output signal v3 of the combining circuit 5,
A contrast control circuit 6 that amplifies the input video signal VIN, and an existing gain adjustment circuit 7. DC regeneration circuit 8.
The configuration includes a video output circuit 9°, a turn-off adjustment circuit 10, and capacitors C5+C11.

垂直パラボラ波形成回路2及び水平パラボラ波形成回路
4の具体的な回路例を第2図及び第3図に示す。
Specific circuit examples of the vertical parabolic wave forming circuit 2 and the horizontal parabolic wave forming circuit 4 are shown in FIGS. 2 and 3.

垂直パラボラ波形成回路2は、垂直偏向コイルIJH+
コンデンサCat〜C23,抵抗R□及び減算回路21
を備え、垂直出力回路lの偏向電流を入力してこれを積
分、減算し、垂直パラボラ波(V+)を廃生ずる。
The vertical parabolic wave forming circuit 2 includes a vertical deflection coil IJH+
Capacitor Cat~C23, resistor R□ and subtraction circuit 21
It inputs the deflection current of the vertical output circuit 1, integrates and subtracts it, and generates a vertical parabolic wave (V+).

水平パラボラ波形成回路4は、コイルL41及びコンデ
ンサC41を備え、水平出力回路3のフライバックトラ
ンスFBTからのフライバックパルスを取出し、   
               このフライバックパル
スをトリガとしてLC共振回路によシ水平ボラポラ波(
v2)を形成する。
The horizontal parabolic wave forming circuit 4 includes a coil L41 and a capacitor C41, and takes out the flyback pulse from the flyback transformer FBT of the horizontal output circuit 3.
Using this flyback pulse as a trigger, the LC resonant circuit generates a horizontal volapolar wave (
v2).

次に、この実施例の動作について説明する。Next, the operation of this embodiment will be explained.

第4図はこの実施例の動作を説明するための各部信号の
波図である。
FIG. 4 is a wave diagram of signals of various parts for explaining the operation of this embodiment.

前述した垂直バラホラ波形成回路2の出力信号■l及び
水平パラボラ波形成回路4の出力信号■2はそれぞれ第
4図の上から1段目、2段目に示す波形となる。
The output signal (1) of the vertical parabolic waveforming circuit 2 and the output signal (2) of the horizontal parabolic waveforming circuit 4 have the waveforms shown in the first and second rows from the top of FIG. 4, respectively.

垂直パラボラ波形成回路2の出力信号■l及び水平パラ
ボラ波形成回路4の出力信号v2は、合成回路5により
合成され出力信号■3となる。この出力信号v3がコン
トラスト制御回路6に入力されてトランジスタQ、のベ
ース電圧■B1となり、映像信号VINに対するコント
ラスト制御回路6の増幅度が制御される。
The output signal ``1'' of the vertical parabolic wave forming circuit 2 and the output signal v2 of the horizontal parabolic wave forming circuit 4 are combined by the combining circuit 5 to form an output signal ``3''. This output signal v3 is input to the contrast control circuit 6 and becomes the base voltage B1 of the transistor Q, so that the amplification degree of the contrast control circuit 6 with respect to the video signal VIN is controlled.

説明の都合上、映像信号VINの振幅は一定とする。For convenience of explanation, it is assumed that the amplitude of the video signal VIN is constant.

コントラスト制御回路6において、映像信号VINが入
力されるとトランジスタQ3には電流i(1が流れる。
In the contrast control circuit 6, when the video signal VIN is input, a current i (1) flows through the transistor Q3.

このときトランジスタQl、Q2にも電流が流れ、トラ
ンジスタQ、に流れる電流i1 とトランジスタQzに
流れる電流12とを加えたものは電流i6に等しく、そ
の分流比はトランジスタQ1のベース電圧”Blとトラ
ンジスタQzのベース電圧■B2の電圧差によシ異なる
At this time, current also flows through the transistors Ql and Q2, and the sum of the current i1 flowing through the transistor Q and the current 12 flowing through the transistor Qz is equal to the current i6. The base voltage of Qz differs depending on the voltage difference of B2.

1g 5図ニヘース!圧Vnt 、 VB2 F)差(
VBI −VB2 )とトランジスタQ1に流れる電流
=1との関係を示す。
1g Figure 5! Pressure Vnt, VB2 F) difference (
The relationship between VBI - VB2 ) and current flowing through transistor Q1 = 1 is shown.

ベース電圧VB2は固定されているので、ベース電圧V
BIを変化させると映像信号VINに対する増幅度が変
化し、出力信号V4の振幅が変化する。
Since the base voltage VB2 is fixed, the base voltage V
When BI is changed, the degree of amplification for the video signal VIN is changed, and the amplitude of the output signal V4 is changed.

ベース電圧■B1には合成回路5の出力信号■3が重畳
されているので、出力信号■4は第4図下から2段目の
ように、振幅がパラボラ波状に変化する。
Since the output signal (2) 3 of the synthesis circuit 5 is superimposed on the base voltage (2) B1, the amplitude of the output signal (2) 4 changes in the form of a parabolic wave, as shown in the second row from the bottom of FIG.

以下、従来と同様に、ゲイン調整回路7.直流再生回路
8.ビデオ出力回路9及びカットオフ調整回路lOを経
由して第4図最下段に示すような、各垂直走査期間Il
l vの中間で振幅が最も不妊く、かつ各水平走査期間
Ill Hの中間で振幅が最も小さい出力信号votr
Tが得られる。このような出力信号vou’rをCRT
のカンードに印加することにより、CRTの画面全体を
同一の輝度とすることができる。
Hereinafter, as in the conventional case, the gain adjustment circuit 7. DC regeneration circuit 8. Each vertical scanning period Il as shown in the bottom row of FIG.
The output signal votr has the lowest amplitude in the middle of lv and the smallest amplitude in the middle of each horizontal scanning period IllH.
T is obtained. Such an output signal vou'r is transferred to a CRT
By applying this to the cands, the entire CRT screen can be made to have the same brightness.

第6図は本発明のi2の実施例を示す回路図であるO この実施例は、合成回路5の出力信号v3をビデオ出力
回路9Aに印加してこのビデオ出力回路9人の直流再生
回路8からの映像信号に対する増幅度を制御するように
したものである。
FIG. 6 is a circuit diagram showing an embodiment of i2 of the present invention. In this embodiment, the output signal v3 of the combining circuit 5 is applied to the video output circuit 9A, and the video output circuit 9 has a direct current reproduction circuit 8. It is designed to control the degree of amplification for the video signal from.

トランジスタQ91pQez及び抵抗几91〜几94を
備えて構成されたビデオ出力回路9^のトランジスタQ
91のベース電圧を合成回路5の出力信号V3により変
化させることにより、トランジスタQ91゜Qe意の電
流を変化させて映像信号に対する増幅度を変化させる。
Transistor Q of video output circuit 9 ^ configured with transistor Q91pQez and resistors 91 to 94
By changing the base voltage of the transistor Q91 by the output signal V3 of the combining circuit 5, the current flowing through the transistor Q91°Qe is changed and the degree of amplification for the video signal is changed.

そしてカットオフ調整回路10を経由させることにより
、第4図最下段に示すような出力信号V OUTが得ら
扛る、。
By passing the signal through the cutoff adjustment circuit 10, an output signal V OUT as shown in the bottom row of FIG. 4 is obtained.

〔発明の効果〕 以上説明したように本発明は、各垂直走査期間及び各水
平走査期間の中間でそれぞれ最低となる下に凸の放物線
状の波形の垂直パラボラ波、水平パラボラ波を発生して
これらを合成し、この合成波により映像信号に対する増
幅度を各走査期間の中間で最低となるよう制御する構成
とすることにより、CRTの画面の中央部と周辺部との
輝度差を補正することができる効果がある。
[Effects of the Invention] As explained above, the present invention generates a vertical parabolic wave and a horizontal parabolic wave with a downwardly convex parabolic waveform that reaches its lowest point in the middle of each vertical scanning period and each horizontal scanning period. By combining these and using this composite wave to control the amplification degree for the video signal to be the lowest in the middle of each scanning period, the brightness difference between the center and peripheral areas of the CRT screen can be corrected. There is an effect that can be done.

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

第1図は本発明の第1の実施例を示す回路図、第2図及
び第3図はそれぞれ第1図に示さnた実施例の垂直パラ
ボラ波形成回路及び水平パラボラ波形成回路の具体的な
回路例を示す回路図、第4図及び第5図はそれぞれ第1
図に示された実施例の動作を説明するための各部信号の
波形図及びコントラスト制御回路の特性図、第6図は本
発明の第2の実施例を示す回路図、第7図は従来のビデ
オ増幅回路の一例を示すプロ、り図である。 1・・・・・・垂直出力回路、2・・・・・・垂直パラ
ボラ波形成回路、3・・・・・・水平出力回路、4・・
・・・・水平パラボラ波形成回路、5・・・・・・合成
回路、6,6A・・・・・・コントラスト制御回路、7
・・・・・・ゲイン調整回路、8・・・・・・直流再生
回路、919A・・・・・・ビデオ出力回路、lO・・
・・・・カットオフ調整回路、21°°゛°゛減算回路
、C1〜C@ HC21”” ” !3 + C41・
・・・・・コンデンサ、FBT・・・・・・フライバッ
クトランス、L□・・・・・・垂直偏向コイル、L41
・・・・・・コイル、Q1〜Qs e Qet *Q*
*0°゛°°°トランジスタ、R1〜R,、R2,、R
,、〜Rg4・・・・・・抵抗。 代理人 弁理士  内 原   晋 羊 閃 茅 田 早 電流 芹 曹
FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIGS. 2 and 3 are specific examples of the vertical parabolic wave forming circuit and the horizontal parabolic wave forming circuit of the embodiment shown in FIG. 1, respectively. Circuit diagrams illustrating circuit examples, Figures 4 and 5, are respectively shown in Figure 1.
The waveform diagram of each part signal and the characteristic diagram of the contrast control circuit are used to explain the operation of the embodiment shown in the figure. FIG. 6 is a circuit diagram showing the second embodiment of the present invention, and FIG. 7 is a circuit diagram of the conventional one. 1 is a schematic diagram showing an example of a video amplifier circuit. 1... Vertical output circuit, 2... Vertical parabolic wave forming circuit, 3... Horizontal output circuit, 4...
...Horizontal parabolic wave forming circuit, 5...Synthesizing circuit, 6,6A...Contrast control circuit, 7
... Gain adjustment circuit, 8 ... DC regeneration circuit, 919A ... Video output circuit, lO ...
...Cutoff adjustment circuit, 21°°゛°゛subtraction circuit, C1~C@HC21'''' !3 + C41・
... Capacitor, FBT ... Flyback transformer, L□ ... Vertical deflection coil, L41
・・・・・・Coil, Q1~Qs e Qet *Q*
*0°゛°°°transistor, R1~R,, R2,, R
,, ~Rg4...Resistance. Agent: Patent Attorney Shinyo Uchihara, Sen Kayata Hayden, Seriso

Claims (1)

【特許請求の範囲】[Claims] 各垂直走査ごとに、これら各垂直走査期間の中間で最低
となる下に凸の放物線状の波形の垂直パラボラ波を発生
する垂直パラボラ波形成回路と、各水平走査ごとに、こ
れら各水平走査期間の中間で最低となる下に凸の放物線
状の波形の水平パラボラ波を発生する水平パラボラ波形
成回路と、前記垂直パラボラ波形成回路の出力信号及び
前記水平パラボラ波形成回路の出力信号を合成する合成
回路と、この合成回路の出力信号に従つて映像信号に対
する増幅度を、前記各垂直走査期間及び各水平走査期間
の中間で最低となるように制御する増幅部とを有するこ
とを特徴とするビデオ増幅回路。
A vertical parabolic wave forming circuit generates a vertical parabolic wave having a downwardly convex parabolic waveform that is the lowest in the middle of each vertical scanning period for each vertical scanning, and a vertical parabolic waveforming circuit that generates a vertical parabolic wave with a downwardly convex parabolic waveform that is the lowest in the middle of each of these vertical scanning periods, and for each horizontal scanning, each of these horizontal scanning periods. A horizontal parabolic wave forming circuit that generates a horizontal parabolic wave having a downwardly convex parabolic waveform that reaches its lowest point in the middle of , an output signal of the vertical parabolic wave forming circuit, and an output signal of the horizontal parabolic wave forming circuit are combined. It is characterized by comprising a combining circuit and an amplifying unit that controls the amplification degree of the video signal according to the output signal of the combining circuit so that it becomes the lowest in the middle of each vertical scanning period and each horizontal scanning period. Video amplifier circuit.
JP63308199A 1988-12-05 1988-12-05 Video amplifier circuit Pending JPH02153680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63308199A JPH02153680A (en) 1988-12-05 1988-12-05 Video amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63308199A JPH02153680A (en) 1988-12-05 1988-12-05 Video amplifier circuit

Publications (1)

Publication Number Publication Date
JPH02153680A true JPH02153680A (en) 1990-06-13

Family

ID=17978110

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63308199A Pending JPH02153680A (en) 1988-12-05 1988-12-05 Video amplifier circuit

Country Status (1)

Country Link
JP (1) JPH02153680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519447A (en) * 1993-10-28 1996-05-21 Mitsubishi Denki Kabushiki Kaisha Wide aspect television receiver including a correcting waveform signal generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519447A (en) * 1993-10-28 1996-05-21 Mitsubishi Denki Kabushiki Kaisha Wide aspect television receiver including a correcting waveform signal generator

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