JPH078008B2 - Vertical position correction circuit for raster - Google Patents

Vertical position correction circuit for raster

Info

Publication number
JPH078008B2
JPH078008B2 JP62308071A JP30807187A JPH078008B2 JP H078008 B2 JPH078008 B2 JP H078008B2 JP 62308071 A JP62308071 A JP 62308071A JP 30807187 A JP30807187 A JP 30807187A JP H078008 B2 JPH078008 B2 JP H078008B2
Authority
JP
Japan
Prior art keywords
video signal
composite video
vertical
vertical deflection
raster
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.)
Expired - Lifetime
Application number
JP62308071A
Other languages
Japanese (ja)
Other versions
JPH01147966A (en
Inventor
善春 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62308071A priority Critical patent/JPH078008B2/en
Publication of JPH01147966A publication Critical patent/JPH01147966A/en
Publication of JPH078008B2 publication Critical patent/JPH078008B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、コンポジツトビデオ信号とRGB信号とを受
信可能な陰極線管表示装置(以下、「デイスプレイモニ
タ」という)におけるコンポジツトビデオ信号受信時
と、RGB信号受信時のラスタの垂直中心位置を補正する
回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for receiving a composite video signal in a cathode ray tube display device (hereinafter, referred to as "display monitor") capable of receiving a composite video signal and an RGB signal. And a circuit for correcting the vertical center position of the raster when receiving an RGB signal.

〔従来の技術〕[Conventional technology]

デイスプレイモニタ、特にマルチシンクタイプのデイス
プレイモニタにおいては、入力されるRGB信号は種々の
映像タイミングのものがあり、それによりデイスプレイ
モニタの垂直偏向回路の帰線期間が限定される。特に、
RGB信号においては、垂直同期信号と映像信号が接近し
ているので垂直帰線期間が短くなるように、垂直偏向出
力回路が設計されなければならない。垂直帰線期間は、
垂直偏向出力回路と、入力される垂直同期信号の周波数
により決定され、垂直同期信号と映像信号のタイミング
により、垂直帰線期間を制御することは、回路がかなり
複雑になることが予想される。また、同一垂直同期周波
数であつても、垂直同期信号と映像信号のタイミングが
異なるビデオ信号が存在するので、垂直同期信号によつ
て垂直帰線期間を制御すると、垂直偏向の直線性が変化
する。以上の理由から、垂直帰線期間TVRが短かくなる
ように垂直偏向出力回路が設計された場合、コンポジツ
トビデオ信号の受信時に、映像の中心が、陰極線管の表
示面の中心より下がつてしまうという問題点がある。第
2図は、従来の垂直偏向回路における垂直帰線期間TVR
を長くした場合のタイミング図であり、同図(a)は垂
直偏向出力電圧波形、同図(b)は垂直偏向出力電流波
形、同図(c)はコンポジツトビデオ信号波形を示して
いる。この場合は、垂直偏向電流の中心と映像信号の中
心が一致している。
In a display monitor, especially in a multi-sync type display monitor, there are various RGB image timings for input RGB signals, which limits the blanking period of the vertical deflection circuit of the display monitor. In particular,
Since the vertical synchronizing signal and the video signal are close to each other in the RGB signal, the vertical deflection output circuit must be designed so that the vertical blanking period becomes short. The vertical blanking period is
Controlling the vertical blanking period depending on the vertical deflection output circuit and the frequency of the input vertical synchronizing signal and controlling the timing of the vertical synchronizing signal and the video signal is expected to make the circuit considerably complicated. Further, even if the vertical synchronizing signal has the same vertical synchronizing frequency, there is a video signal in which the timings of the vertical synchronizing signal and the video signal are different. Therefore, if the vertical blanking period is controlled by the vertical synchronizing signal, the linearity of vertical deflection changes. . For the above reason, when the vertical deflection output circuit is designed so that the vertical blanking period T VR becomes short, the center of the image is lower than the center of the display surface of the cathode ray tube when the composite video signal is received. There is a problem that it gets tired. FIG. 2 shows the vertical blanking period T VR in the conventional vertical deflection circuit.
6A is a timing diagram in the case of lengthening, FIG. 7A shows a vertical deflection output voltage waveform, FIG. 7B shows a vertical deflection output current waveform, and FIG. 7C shows a composite video signal waveform. In this case, the center of the vertical deflection current and the center of the video signal coincide with each other.

第3図は垂直帰線期間TVRを短くした場合のタイミング
図であり、同図(a)は偏向出力電圧波形、同図(b)
は偏向出力電流波形、同図(c)はコンポジツトビデオ
信号波形を示している。この場合は、垂直偏向電流の中
心より映像信号の中心が若干下にずれていることがわか
る。
FIG. 3 is a timing chart when the vertical blanking period T VR is shortened, FIG. 3A is a deflection output voltage waveform, and FIG.
Shows a deflection output current waveform, and FIG. 7 (c) shows a composite video signal waveform. In this case, it can be seen that the center of the video signal is slightly displaced from the center of the vertical deflection current.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

このように、従来の垂直偏向回路では、コンポジツトビ
デオ信号が入力された場合、映像の中心点がRGB信号を
受信している場合より下がつてしまうという問題点があ
つた。
As described above, the conventional vertical deflection circuit has a problem that when the composite video signal is input, the center point of the image is lower than when the RGB signal is received.

この発明は上記のような問題点を解決するためになされ
たもので、RGB信号の入力時と、コンポジツトビデオ信
号入力時とにおいて、陰極線管の表示面の中心点と、映
像の中心点とを一致させることのできるラスタの垂直位
置補正回路を得ることを目的とする。
The present invention has been made to solve the above problems, and when the RGB signal is input and when the composite video signal is input, the center point of the display surface of the cathode ray tube and the center point of the image are It is an object of the present invention to obtain a vertical position correction circuit for a raster that can match the.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係るラスタの垂直位置補正回路は、垂直偏向
コイルの接地側端子と接地との間に限流抵抗を介して接
続されているスイツチ素子と、コンポジツトビデオ信号
が入力されたとき上記スイツチ素子を導通させる検出信
号を出力するコンポジツトビデオ信号検出手段とを備え
たことを特徴とする。
The raster vertical position correction circuit according to the present invention includes a switch element connected via a current limiting resistor between the ground side terminal of the vertical deflection coil and the ground, and the switch when the composite video signal is input. And a composite video signal detecting means for outputting a detection signal for making the element conductive.

〔作用〕[Action]

この発明におけるコンポジツトビデオ信号入力検出手段
は、コンポジツトビデオ信号が入力されている間、検出
信号を出力する。スイツチ素子は検出信号が出力されて
いる間ON状態となり、垂直偏向コイルに限流抵抗を介し
て直流電流を通電し、ラスタの垂直位置を補正する。
The composite video signal input detecting means in the present invention outputs a detection signal while the composite video signal is being input. The switch element is in the ON state while the detection signal is being output, and a direct current is supplied to the vertical deflection coil through the current limiting resistance to correct the vertical position of the raster.

〔発明の実施例〕Example of Invention

以下、この発明の一実施例を図について説明する。第1
図において、(1)は垂直偏向出力回路、(2)は垂直
偏向コイル、(3)は垂直偏向出力回路(1)の一部を
構成しているカツプリングコンデンサ、(4)はスイツ
チ素子を構成するトランジスタ、(5)は限流抵抗で、
一端が垂直偏向コイル(2)とカツプリングコンデンサ
(3)の接続点に接続され、他端がトランジスタ(4)
のコレクタに接続されているコレクタ抵抗、(6)はト
ランジスタ(5)のベース抵抗、(7)はコンポジツト
ビデオ信号の入力時にHIGH状態となり、それ以外はLOW
状態となる検出信号を出力するコンポジツトビデオ信号
入力検出で、トランジスタ(4),抵抗(5),
(6),コンポジツトビデオ信号検出手段(7)でラス
タの垂直位置補正回路(8)を構成している。
An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (1) is a vertical deflection output circuit, (2) is a vertical deflection coil, (3) is a coupling capacitor forming a part of the vertical deflection output circuit (1), and (4) is a switch element. The constituent transistor, (5) is a current limiting resistor,
One end is connected to the connection point of the vertical deflection coil (2) and the coupling capacitor (3), and the other end is the transistor (4).
The collector resistance connected to the collector of the transistor, (6) is the base resistance of the transistor (5), and (7) is high when the composite video signal is input, otherwise it is low.
The composite video signal input detection that outputs the detection signal that becomes the state, the transistor (4), the resistor (5),
(6) The composite video signal detecting means (7) constitutes a raster vertical position correction circuit (8).

つぎにこの実施例の動作を説明する。RGB信号の入力時
は、トランジスタ(4)のベースはLOW状態なのでトラ
ンジスタ(4)はOFF状態となり、補正回路(8)は動
作しない。他方、コンポジツトビデオ信号の入力時に
は、トランジスタ(4)のベースはHIGH状態となり、ト
ランジスタ(4)がONとなつて垂直偏向コイル(2),
抵抗(5)およびトランジスタ(4)をとおつて垂直偏
向出力回路(1)より直流電流が流れ、ラスタの垂直位
置が補正される。したがつて、この直流電流値が適当な
値となるようにすれば、コンポジツトビデオ信号入力時
に、ラスタの中心点を陰極線管の表示面の中心点に合わ
せることができる。
Next, the operation of this embodiment will be described. When the RGB signal is input, the base of the transistor (4) is in the LOW state, the transistor (4) is in the OFF state, and the correction circuit (8) does not operate. On the other hand, when the composite video signal is input, the base of the transistor (4) is in the HIGH state, the transistor (4) is turned on, and the vertical deflection coil (2),
A direct current flows from the vertical deflection output circuit (1) through the resistor (5) and the transistor (4), and the vertical position of the raster is corrected. Therefore, if the DC current value is set to an appropriate value, the center point of the raster can be aligned with the center point of the display surface of the cathode ray tube when the composite video signal is input.

なお、垂直偏向コイル(2)の一端は、抵抗(5)をと
おしてトランジスタ(4)のコレクタに接続されている
が、コレクタは交流信号成分に対するインピーダンスが
高いために、垂直偏向コイル(2)に流れる交流信号成
分がこのラスタの垂直位置補正回路(8)を接続したこ
とによつてそこなわれることはない。
It should be noted that one end of the vertical deflection coil (2) is connected to the collector of the transistor (4) through the resistor (5). However, since the collector has a high impedance with respect to the AC signal component, the vertical deflection coil (2) The alternating current signal component flowing through is not damaged by connecting the vertical position correction circuit (8) of this raster.

〔発明の効果〕〔The invention's effect〕

以上のようにこの発明によればコンポジツトビデオ信号
入力時に垂直偏向コイルに所定量の直流電流を通電して
ラスタの垂直位置を補正するようにしたので、垂直帰線
期間が短くなるように垂直偏向出力回路を設計してもコ
ンポジツトビデオ信号の入力時に、垂直偏向の直線性に
影響を与えることなく陰極線管の中心点と映像の中心点
とが一致させることのできるラスタの垂直位置補正回路
が得られる効果がある。
As described above, according to the present invention, when a composite video signal is input, a predetermined amount of direct current is applied to the vertical deflection coil to correct the vertical position of the raster, so that the vertical blanking period is shortened. A raster vertical position correction circuit that can match the center point of the cathode ray tube with the center point of the image without affecting the linearity of vertical deflection when a composite video signal is input even if a deflection output circuit is designed. There is an effect that can be obtained.

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

第1図はこの発明の一実施例を示す回路図、第2図は従
来の垂直偏向回路において垂直偏向の帰線期間をRGB信
号に合わせた場合のタイミング図、第3図は同じく垂直
偏向の帰線期間をコンポジツトビデオ信号に合わせて短
くした場合のタイミング図である。 (1)…垂直偏向出力回路、(2)…垂直偏向コイル、
(3)…カツプリングコンデンサ、(4)…トランジス
タ、(5)…コレクタ抵抗、(6)…ベース抵抗、
(7)…コンポジツトビデオ信号入力検出手段、(8)
…ラスタの垂直位置補正回路。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a timing diagram when a blanking period of vertical deflection is adjusted to an RGB signal in a conventional vertical deflection circuit, and FIG. FIG. 9 is a timing diagram when the blanking period is shortened in accordance with the composite video signal. (1) ... Vertical deflection output circuit, (2) ... Vertical deflection coil,
(3) ... Coupling capacitor, (4) ... Transistor, (5) ... Collector resistance, (6) ... Base resistance,
(7) ... Composite video signal input detecting means, (8)
... Raster vertical position correction circuit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】コンポジットビデオ信号とRGB信号とを受
信可能な陰極線管表示装置の垂直偏向回路の垂直偏向コ
イルの接地側端子と接地との間に限流抵抗を介して接続
されているスイッチ素子と、コンポジットビデオ信号が
入力されたとき上記スイッチ素子を導通させる検出信号
を出力するコンポジットビデオ信号入力検出手段とを備
え、コンポジットビデオ信号が入力されたとき、上記垂
直偏向コイルにラスタの位置を補正する直流電流を通電
し、陰極線管の表示面の中心点と映像の中心点とを一致
させるように構成してなるラスタの垂直位置補正回路。
1. A switching element connected between a ground side terminal of a vertical deflection coil of a vertical deflection circuit of a cathode ray tube display device capable of receiving a composite video signal and an RGB signal and a ground via a current limiting resistor. And a composite video signal input detecting means for outputting a detection signal for conducting the switch element when the composite video signal is input, and when the composite video signal is input, the raster position is corrected in the vertical deflection coil. A vertical position correction circuit for a raster, which is configured so that the center point of the display surface of the cathode ray tube and the center point of the image are made to coincide with each other by applying a direct current.
JP62308071A 1987-12-03 1987-12-03 Vertical position correction circuit for raster Expired - Lifetime JPH078008B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62308071A JPH078008B2 (en) 1987-12-03 1987-12-03 Vertical position correction circuit for raster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62308071A JPH078008B2 (en) 1987-12-03 1987-12-03 Vertical position correction circuit for raster

Publications (2)

Publication Number Publication Date
JPH01147966A JPH01147966A (en) 1989-06-09
JPH078008B2 true JPH078008B2 (en) 1995-01-30

Family

ID=17976527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62308071A Expired - Lifetime JPH078008B2 (en) 1987-12-03 1987-12-03 Vertical position correction circuit for raster

Country Status (1)

Country Link
JP (1) JPH078008B2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848834Y2 (en) * 1978-03-13 1983-11-08 ソニー株式会社 vertical centering circuit

Also Published As

Publication number Publication date
JPH01147966A (en) 1989-06-09

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