JPH06165058A - Crt - Google Patents

Crt

Info

Publication number
JPH06165058A
JPH06165058A JP30577292A JP30577292A JPH06165058A JP H06165058 A JPH06165058 A JP H06165058A JP 30577292 A JP30577292 A JP 30577292A JP 30577292 A JP30577292 A JP 30577292A JP H06165058 A JPH06165058 A JP H06165058A
Authority
JP
Japan
Prior art keywords
aspect ratio
sawtooth wave
circuit
pulse
vertical
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.)
Granted
Application number
JP30577292A
Other languages
Japanese (ja)
Other versions
JP3326830B2 (en
Inventor
Yoshinobu Tsunetomi
義信 常富
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP30577292A priority Critical patent/JP3326830B2/en
Publication of JPH06165058A publication Critical patent/JPH06165058A/en
Application granted granted Critical
Publication of JP3326830B2 publication Critical patent/JP3326830B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To prevent a picture from getting adverse by operating an automatic black level adjusting circuit by adjusting the level of a vertical sawtooth wave signal so as to project a bright line for reference out of an effective picture when projecting the picture of an aspect ratio laterally longer than a screen aspect ratio. CONSTITUTION:When projecting the picture of an aspect ratio 16:9 with a screen aspect ratio 4:3, first and second changeover switches SW1 and SW2 are switched to the side of a terminal (b). Then, a vertical sawtooth wave generating circuit 2 outputs the vertical sawtooth wave signal of an amplitude smaller than the case of projecting the picture of 4:3, and the shift pulse of a pulse preparing circuit 8 is added to this signal. Therefore, the almost vertical sawtooth wave signal is supplied to a vertical output circuit 3, and the picture of 16:9 is projected. A reference pulse is inserted to the video signal by the black level adjusting circuit and this reference pulse block is coincident with a shift pulse block, the bright line for reference is positioned out of the effective picture.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は自動黒レベル調整(オー
トカットオフ)機能を有するCRTに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT having an automatic black level adjustment (auto cutoff) function.

【0002】[0002]

【従来の技術】図4は、従来の自動黒レベル調整回路を
付加したCRT出力回路の一部回路図を示す。図4にお
いて、リファレンス挿入回路10は映像信号にリファレ
ンスパルスを挿入し、図5に示す如くリファレンスパル
スを挿入した映像信号を加算器11を介して出力トラン
ジスタTrに出力する。この出力トランジスタTrの動
作によってカソード電流が流れる。このカソード電流の
大きさを検出用抵抗Rの両端電圧として得て、この電圧
を比較器12で基準電圧と比較する。この比較器12は
図5に示す制御パルスの区間だけ動作し、その以外の
時、出力はハイインピーダンスになる。比較器12の出
力はサンプルホールド用コンデンサCを介して前記加算
器11にフィードバックされる。
2. Description of the Related Art FIG. 4 is a partial circuit diagram of a CRT output circuit to which a conventional automatic black level adjusting circuit is added. In FIG. 4, the reference insertion circuit 10 inserts a reference pulse into the video signal, and outputs the video signal with the reference pulse inserted as shown in FIG. 5 to the output transistor Tr via the adder 11. A cathode current flows by the operation of the output transistor Tr. The magnitude of this cathode current is obtained as the voltage across the detection resistor R, and this voltage is compared with the reference voltage by the comparator 12. This comparator 12 operates only during the section of the control pulse shown in FIG. 5, and at other times, the output becomes high impedance. The output of the comparator 12 is fed back to the adder 11 via the sample hold capacitor C.

【0003】即ち、制御パルスの区間ではリファレンス
パルスが出力トランジスタTrに供給され、この際のカ
ソード電流に対応する電圧が基準電圧と比較される。そ
して、その差電圧に比例する電流がサンプルホールド用
コンデンサCにチャージされてカソード電流が適正値に
調整される。これを垂直周期で繰り返すことによって黒
レベルが一定値に保たれる。
That is, during the control pulse period, the reference pulse is supplied to the output transistor Tr, and the voltage corresponding to the cathode current at this time is compared with the reference voltage. Then, a current proportional to the difference voltage is charged in the sample-hold capacitor C and the cathode current is adjusted to an appropriate value. By repeating this in the vertical cycle, the black level is maintained at a constant value.

【0004】一方、画面アスペクト比が4:3のCRT
で、横長のアスペクト比16:9の映像を映し出すこと
ができるCRTが提案されている。かかるCRTの垂直
側の偏向回路は、図6に示すように、垂直ノコギリ波発
生回路2を有し、この垂直ノコギリ波発生回路2は垂直
周期の垂直ノコギリ波信号を出力する。この垂直ノコギ
リ波信号のレベルは制御信号によって可変可能に構成さ
れている。垂直出力回路3は垂直ノコギリ波信号を一定
利得で増幅し、この増幅信号が垂直偏向コイル4に供給
される。4:3の映像信号の場合には、図7(a)に示
す振幅のノコギリ波信号を出力し、図8(a)に示すよ
うに有効画面より若干広い範囲でオーバースキャンして
4:3の映像が映し出される。また、16:9の映像信
号の場合には、図7(b)に示すように上記より小さい
振幅のノコギリ波信号を出力し、図8(b)に示すよう
に上記より上下方向に短く有効画面より上下方向に狭い
範囲でスキャンして16:9の映像が映し出される。
On the other hand, a CRT having a screen aspect ratio of 4: 3
Thus, a CRT capable of displaying a horizontally long image with an aspect ratio of 16: 9 has been proposed. The deflection circuit on the vertical side of the CRT has a vertical sawtooth wave generation circuit 2 as shown in FIG. 6, and the vertical sawtooth wave generation circuit 2 outputs a vertical sawtooth wave signal having a vertical cycle. The level of this vertical sawtooth wave signal is variable by a control signal. The vertical output circuit 3 amplifies the vertical sawtooth wave signal with a constant gain, and the amplified signal is supplied to the vertical deflection coil 4. In the case of a video signal of 4: 3, a sawtooth wave signal having the amplitude shown in FIG. 7A is output, and as shown in FIG. Is displayed. Further, in the case of a 16: 9 video signal, a sawtooth wave signal having an amplitude smaller than the above is output as shown in FIG. 7 (b), and as shown in FIG. 8 (b), it is effective in a shorter vertical direction than the above. A 16: 9 image is displayed by scanning a narrow range vertically from the screen.

【0005】[0005]

【発明が解決しようとする課題】ここで、自動黒レベル
調整回路を有するCRTにあって4:3の映像信号を映
す場合には、図8(a)に示すようにリファレンス用輝
線が有効画面の外に位置するが、16:9の映像信号を
映す場合には、図8(b)に示すようにリファレンス用
輝線が有効画面の内に位置するため、画面が見苦しいと
いう欠点があった。16:9の映像の場合には自動黒レ
ベル調整機能を止めてリファレンス用輝線を消すことも
考えられるが、黒レベルの自動調整が行われないため経
時変化等によりホワイトバランスのずれが生じることに
なる。
In a CRT having an automatic black level adjusting circuit, when a 4: 3 video signal is projected, the reference bright line is effective as shown in FIG. 8 (a). However, in the case of displaying a 16: 9 video signal, the reference bright line is located inside the effective screen, as shown in FIG. 8B, and thus the screen is unsightly. In the case of a 16: 9 image, it is conceivable to stop the automatic black level adjustment function and erase the reference bright line, but since the black level is not automatically adjusted, the white balance may shift due to changes over time. Become.

【0006】そこで、本発明は画面アスペクト比より横
長のアスペクト比の映像を映す場合に自動黒レベル調整
回路を働かせても画面が見苦しくならないCRTを提供
することを課題とする。
Therefore, it is an object of the present invention to provide a CRT in which the screen does not become uncomfortable even when the automatic black level adjustment circuit is activated when an image having an aspect ratio longer than the screen aspect ratio is projected.

【0007】[0007]

【課題を解決するための手段】上記課題を達成するため
の請求項1に係る発明のCRTは、映像信号にリファレ
ンスパルスを挿入し、このリファレンスパルスによって
リファレンス用輝線を映し出して黒レベルの調整を行う
黒レベル調整回路と、垂直ノコギリ波信号のレベルを可
変できる偏向回路とを有し、自動で黒レベルの調整を行
うと共に画面アスペクト比と異なるアスペクト比の映像
を映し出すことができるCRTにおいて、画面アスペク
ト比より横長のアスペクト比の映像を映し出す場合に
は、前記リファレンス用輝線を有効画面の外に映出する
べく垂直ノコギリ波信号のレベルを調整したものであ
る。
A CRT according to a first aspect of the invention for achieving the above object inserts a reference pulse into a video signal and projects a reference bright line to adjust the black level. A CRT that has a black level adjustment circuit and a deflection circuit that can vary the level of a vertical sawtooth wave signal to automatically adjust the black level and project an image with an aspect ratio different from the screen aspect ratio When displaying an image having an aspect ratio that is longer than the aspect ratio, the level of the vertical sawtooth wave signal is adjusted so that the reference bright line is displayed outside the effective screen.

【0008】請求項2に係る発明のCRTは、上記請求
項1の構成にあって、映像信号のリファレンスパルス後
端と実際の映像部前端との区間をブランキング区間とし
たものである。
According to a second aspect of the present invention, in the configuration of the first aspect, the interval between the rear end of the reference pulse of the video signal and the actual front end of the video portion is a blanking interval.

【0009】請求項3に係る発明のCRTは、上記請求
項1又は上記請求項2の構成にあって、画面アスペクト
比が4:3で、16:9のアスペクト比の映像を映し出
すことを特徴とするものである。
A CRT according to a third aspect of the present invention has the structure according to the first or second aspect, and displays a video having a screen aspect ratio of 4: 3 and an aspect ratio of 16: 9. It is what

【0010】[0010]

【作用】請求項1から請求項3の発明によれば、画面ア
スペクト比より横長のアスペクト比の映像を映す場合に
は、偏向回路の垂直ノコギリ波信号の振幅レベルが通常
より小さく押さえられると共に垂直ノコギリ波信号が黒
レベル調整回路のリファレンス用輝線を有効画面の外に
映出するよう調整される。又、請求項2の発明によれ
ば、リファレンス用輝線と実際の映像信号との間がブラ
ンキング区間となり、請求項3の発明によれば画面アス
ペクト比4:3のCRTでアスペクト比16:9の映像
を映す場合に適用できる。
According to the first to third aspects of the present invention, when an image having an aspect ratio longer than the screen aspect ratio is displayed, the amplitude level of the vertical sawtooth wave signal of the deflection circuit can be suppressed to a level smaller than usual and the vertical level can be suppressed. The sawtooth wave signal is adjusted so that the reference bright line of the black level adjusting circuit appears outside the effective screen. Further, according to the invention of claim 2, a blanking interval is provided between the reference bright line and the actual video signal. According to the invention of claim 3, a CRT having a screen aspect ratio of 4: 3 has an aspect ratio of 16: 9. It can be applied when the image of is displayed.

【0011】[0011]

【実施例】以下、本発明の実施例を図面を用いて説明す
る。図1から図3は本発明の一実施例を示す。この実施
例では画面アスペクト比4:3のCRTでアスペクト比
16:9の映像(MUSE−NTSCダウンコンバート
の信号等)を映す場合を示す。
Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. This embodiment shows a case where a CRT with a screen aspect ratio of 4: 3 is used to display an image with a 16: 9 aspect ratio (such as a MUSE-NTSC down-convert signal).

【0012】図1にはCRTの一部回路ブロック図が示
されている。図1において、偏向回路1は垂直偏向用回
路と水平偏向用回路(図示せず)とから成る。垂直偏向
用回路は垂直ノコギリ波発生回路2を有し、この垂直ノ
コギリ波発生回路2は垂直同期パルスに同期した垂直ノ
コギリ波信号を作成する。この垂直ノコギリ波発生回路
2には制御信号が供給され、この制御信号によって出力
垂直ノコギリ波信号の振幅レベルが調整される。
FIG. 1 is a partial circuit block diagram of a CRT. In FIG. 1, the deflection circuit 1 comprises a vertical deflection circuit and a horizontal deflection circuit (not shown). The vertical deflection circuit has a vertical sawtooth wave generation circuit 2, and this vertical sawtooth wave generation circuit 2 creates a vertical sawtooth wave signal synchronized with a vertical synchronization pulse. A control signal is supplied to the vertical sawtooth wave generation circuit 2, and the amplitude level of the output vertical sawtooth wave signal is adjusted by this control signal.

【0013】即ち、画面アスペクト比4:3の場合には
図2の(5)に示す振幅のノコギリ波信号を、画面アス
ペクト比16:9の場合には図2の(6)に示すように
上記よりも小さい振幅のノコギリ波信号をそれぞれ抵抗
1と抵抗R2を介して垂直出力回路3に出力する。
That is, when the screen aspect ratio is 4: 3, a sawtooth wave signal having the amplitude shown in (5) of FIG. 2 is used, and when the screen aspect ratio is 16: 9, as shown in (6) of FIG. A sawtooth wave signal having an amplitude smaller than the above is output to the vertical output circuit 3 via the resistors R 1 and R 2 , respectively.

【0014】垂直出力回路3は垂直ノコギリ波信号を一
定利得で増幅等し、増幅等した垂直ノコギリ波信号を垂
直偏向コイル4に供給する。
The vertical output circuit 3 amplifies the vertical sawtooth wave signal with a constant gain and supplies the amplified vertical sawtooth wave signal to the vertical deflection coil 4.

【0015】また、信号処理回路5は映像信号に所定の
信号処理を施し、信号処理された映像信号をブランキン
グ回路6に出力する。ブランキング回路6は水平、垂直
偏向の帰線区間でCRTをカットオフして帰線消去する
よう帰線消去パルスを映像信号に加える。又、ブランキ
ング回路6には下記するブランキングパルスが入力さ
れ、このブランキングパルスが入力されるとこの区間で
も帰線消去パルスを映像信号に加える。ブランキング回
路6で帰線消去パルスを加えられた映像信号はCRT出
力回路に供給され、ここで従来例で示した黒レベル調整
回路により映像信号にリファレンスパルスが挿入され
る。
The signal processing circuit 5 also performs predetermined signal processing on the video signal and outputs the signal-processed video signal to the blanking circuit 6. The blanking circuit 6 applies a blanking pulse to the video signal so as to cut off the CRT in the blanking interval of horizontal and vertical deflection and blanking. A blanking pulse described below is input to the blanking circuit 6, and when this blanking pulse is input, a blanking pulse is added to the video signal also in this section. The video signal to which the blanking circuit 6 has added the blanking pulse is supplied to the CRT output circuit, and the black level adjusting circuit shown in the conventional example inserts a reference pulse into the video signal.

【0016】一方、カウンタ7には水平同期パルスと垂
直同期パルスが導かれ、カウンタ7は水平同期パルスを
カウントし、且つ、垂直同期パルスでリセットする。こ
のカウンタ7のカウントデータはパルス作成回路8に出
力され、パルス作成回路8はこのカウントデータに基づ
きシフトパルスとブランキングパルスをそれぞれ出力す
る。
On the other hand, a horizontal synchronizing pulse and a vertical synchronizing pulse are guided to the counter 7, and the counter 7 counts the horizontal synchronizing pulse and resets with the vertical synchronizing pulse. The count data of the counter 7 is output to the pulse creating circuit 8, and the pulse creating circuit 8 outputs a shift pulse and a blanking pulse based on the count data.

【0017】シフトパルスは、図2の(3)に示すよう
に、リファレンスパルス区間と同一タイミングで発生さ
れ、このシフトパルスは第1切換スイッチSW1のb端
子側を介して偏向回路1の2つの抵抗R1,R2の共通接
続点に導かれる。ブランキングパルスは、図2の(4)
に示すように、アスペクト比16:9の映像を映す場合
にリファレンスパルス後端から実際の映像部前端までの
区間と、実際の映像部後端から垂直同期パルスの前端ま
で区間で発生され、このブランキングパルスは第2切換
スイッチSW2のb端子側を介して上記ブランキング回
路6に出力される。
As shown in (3) of FIG. 2, the shift pulse is generated at the same timing as the reference pulse section, and this shift pulse is input to the deflection circuit 1 through the b terminal side of the first changeover switch SW 1. It is led to the common connection point of the two resistors R 1 and R 2 . The blanking pulse is (4) in FIG.
As shown in, when an image with an aspect ratio of 16: 9 is displayed, it is generated in a section from the rear end of the reference pulse to the front end of the actual video portion and from the rear end of the actual video portion to the front end of the vertical sync pulse. The blanking pulse is output to the blanking circuit 6 via the b terminal side of the second changeover switch SW 2 .

【0018】上記第1切換スイッチSW1及び第2切換
スイッチSW2はスイッチオン状態となるa端子とスイ
ッチオフ状態となるb端子とを選択的に切換え可能に構
成され、この切換えは切換制御信号によって行われる。
即ち、双方のスイッチSW1,SW2は切換制御信号によ
り、アスペクト比4:3の映像の場合にはa端子側に、
アスペクト比16:9の映像の場合にはb端子側にそれ
ぞれ切換えられる。
The first changeover switch SW 1 and the second changeover switch SW 2 are configured so that they can be selectively switched between an a terminal that is in a switch-on state and a b terminal that is in a switch-off state. Done by
That is, both switches SW 1 and SW 2 are switched to the a terminal side by the switching control signal in the case of an image with an aspect ratio of 4: 3.
In the case of an image having an aspect ratio of 16: 9, it is switched to the b terminal side.

【0019】次に、上記構成の作用を説明する。アスペ
クト比4:3の映像を映す場合には、第1及び第2切換
スイッチSW1,SW2は共にa端子側に切換えられる。
そして、垂直ノコギリ波発生回路2は図2の(5)に示
すような垂直ノコギリ波信号を出力するため、従来例と
同様に図8(a)に示す如く4:3の映像が映し出され
る。
Next, the operation of the above configuration will be described. When displaying an image with an aspect ratio of 4: 3, both the first and second selector switches SW 1 and SW 2 are switched to the a terminal side.
Since the vertical sawtooth wave generation circuit 2 outputs the vertical sawtooth wave signal as shown in FIG. 2 (5), a 4: 3 image is displayed as shown in FIG. 8 (a) as in the conventional example.

【0020】また、アスペクト比16:9の映像を映す
場合には、第1及び第2切換スイッチSW1,SW2は共
にb端子側に切換えられる。そして、垂直ノコギリ波発
生回路2は図2の(6)に示すような垂直ノコギリ波信
号を出力し、この垂直ノコギリ波信号にパルス作成回路
8のシフトパルスが加算される。従って、図2の(7)
に示す略垂直ノコギリ波信号が垂直出力回路3に供給さ
れ、図3(b)に示す如く16:9の映像が映し出され
る。映像信号には黒レベル調整回路でリファレンスパル
スが挿入され、このリファレンスパルス区間は上記シフ
トパルス区間と一致するため、リファレンス用輝線は図
3(b)に示すように有効画面の外に位置される。又、
リファレンスパルス後端と実際の映像部前端との間には
ブランキングパルスが挿入されるため、図3(a)に示
すような過渡状態の輝線も見えない。実際の映像部後端
以後にもブランキングパルスが挿入されるため、同様に
過渡状態の輝線が見えない。
When displaying an image with an aspect ratio of 16: 9, both the first and second changeover switches SW 1 and SW 2 are changed over to the b terminal side. Then, the vertical sawtooth wave generation circuit 2 outputs a vertical sawtooth wave signal as shown in (6) of FIG. 2, and the shift pulse of the pulse generation circuit 8 is added to this vertical sawtooth wave signal. Therefore, (7) in FIG.
The substantially vertical sawtooth wave signal shown in FIG. 3 is supplied to the vertical output circuit 3, and a 16: 9 image is displayed as shown in FIG. A reference pulse is inserted into the video signal by the black level adjusting circuit, and this reference pulse section coincides with the shift pulse section. Therefore, the reference bright line is located outside the effective screen as shown in FIG. 3B. . or,
Since the blanking pulse is inserted between the rear end of the reference pulse and the actual front end of the image portion, the bright line in the transient state as shown in FIG. 3A cannot be seen. Since the blanking pulse is inserted even after the actual trailing edge of the video portion, the bright line in the transient state cannot be seen.

【0021】尚、この実施例においては、画面アスペク
ト比4:3のCRTでアスペクト比16:9の映像を映
す場合について説明したが、画面アスペクト比及び映像
アスペクト比はこれに限定されるものではなく画面アス
ペクト比より横長のアスペクト比の映像を映す場合に全
て適用できる。
In this embodiment, a case where a CRT having a screen aspect ratio of 4: 3 is used to display a video having an aspect ratio of 16: 9 has been described, but the screen aspect ratio and the video aspect ratio are not limited to this. It can be applied to all images that have an aspect ratio wider than the screen aspect ratio.

【0022】[0022]

【発明の効果】以上述べたように請求項1から請求項3
に係る発明によれば、画面アスペクト比より横長のアス
ペクト比の映像を映す場合に黒レベル調整回路を働かせ
てもリファレンス用輝線が画面内に出ることがなく画面
が見苦しくならないという効果を奏する。
As described above, the first to third aspects are provided.
According to the invention, the effect that the bright line for reference does not appear in the screen and the screen does not become unsightly even if the black level adjusting circuit is operated when an image having an aspect ratio longer than the screen aspect ratio is displayed.

【0023】また、請求項2に係る発明によれば、リフ
ァレンス用輝線による過渡状態の輝線も映らないため、
さらに良好な画面状態が得られるという効果も奏する。
Further, according to the second aspect of the invention, since the bright line in the transient state due to the reference bright line is not reflected,
There is also an effect that a better screen state can be obtained.

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

【図1】CRTの一部回路ブロック図(実施例)。FIG. 1 is a partial circuit block diagram of a CRT (embodiment).

【図2】各部の出力波形図(実施例)。FIG. 2 is an output waveform diagram of each unit (Example).

【図3】(a)はブランキングパルス未挿入の場合にお
けるアスペクト比16:9の映像の表示状態を示す図、
(b)はブランキングパルス挿入の場合におけるアスペ
クト比16:9の映像の表示状態を示す図(実施例)。
FIG. 3A is a diagram showing a display state of an image with an aspect ratio of 16: 9 when blanking pulses are not inserted;
FIG. 7B is a diagram showing a display state of an image having an aspect ratio of 16: 9 when a blanking pulse is inserted (Example).

【図4】黒レベル調整回路を付加したCRT出力回路の
回路図(従来例)。
FIG. 4 is a circuit diagram of a CRT output circuit to which a black level adjusting circuit is added (conventional example).

【図5】映像信号と制御パルスの波形図(従来例)。FIG. 5 is a waveform diagram of a video signal and a control pulse (conventional example).

【図6】偏向回路の回路図(従来例)。FIG. 6 is a circuit diagram of a deflection circuit (conventional example).

【図7】(a)はアスペクト比4:3の場合の垂直ノコ
ギリ波信号の波形図、(b)はアスペクト比16:9の
場合の垂直ノコギリ波信号の波形図(従来例)。
7A is a waveform diagram of a vertical sawtooth wave signal when the aspect ratio is 4: 3, and FIG. 7B is a waveform diagram of a vertical sawtooth wave signal when the aspect ratio is 16: 9 (conventional example).

【図8】(a)はアスペクト比4:3の映像の表示状態
を示す図、(b)はアスペクト比16:9の映像の表示
状態を示す図(従来例)。
8A is a diagram showing a display state of an image having an aspect ratio of 4: 3, and FIG. 8B is a diagram showing a display state of an image having an aspect ratio of 16: 9 (conventional example).

【符号の説明】[Explanation of symbols]

1…偏向回路 1 ... Deflection circuit

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 映像信号にリファレンスパルスを挿入
し、このリファレンスパルスによってリファレンス用輝
線を映し出して黒レベルの調整を行う黒レベル調整回路
と、垂直ノコギリ波信号のレベルを可変できる偏向回路
とを有し、自動で黒レベルの調整を行うと共に画面アス
ペクト比と異なるアスペクト比の映像を映し出すことが
できるCRTにおいて、 画面アスペクト比より横長のアスペクト比の映像を映し
出す場合には、前記リファレンス用輝線を有効画面の外
に映出するべく垂直ノコギリ波信号のレベルを調整した
ことを特徴とするCRT。
1. A black level adjusting circuit for inserting a reference pulse into a video signal, projecting a reference bright line by the reference pulse to adjust a black level, and a deflection circuit capable of varying the level of a vertical sawtooth wave signal. However, in a CRT that can automatically adjust the black level and display an image with an aspect ratio different from the screen aspect ratio, the above-mentioned reference bright line is effective when displaying an image with a landscape aspect ratio longer than the screen aspect ratio. A CRT characterized by adjusting the level of a vertical sawtooth wave signal so that it is displayed outside the screen.
【請求項2】 映像信号のリファレンスパルス後端と実
際の映像部前端との区間をブランキング区間としたこと
を特徴とする請求項1に記載したCRT。
2. The CRT according to claim 1, wherein the interval between the rear end of the reference pulse of the video signal and the actual front end of the video portion is a blanking interval.
【請求項3】 画面アスペクト比が4:3で、16:9
のアスペクト比の映像を映し出すことを特徴とする請求
項2又は請求項3に記載したCRT。
3. A screen aspect ratio of 4: 3 and 16: 9.
The CRT according to claim 2 or 3, which displays an image having an aspect ratio of.
JP30577292A 1992-11-17 1992-11-17 Video equipment Expired - Fee Related JP3326830B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30577292A JP3326830B2 (en) 1992-11-17 1992-11-17 Video equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30577292A JP3326830B2 (en) 1992-11-17 1992-11-17 Video equipment

Publications (2)

Publication Number Publication Date
JPH06165058A true JPH06165058A (en) 1994-06-10
JP3326830B2 JP3326830B2 (en) 2002-09-24

Family

ID=17949164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30577292A Expired - Fee Related JP3326830B2 (en) 1992-11-17 1992-11-17 Video equipment

Country Status (1)

Country Link
JP (1) JP3326830B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647065A2 (en) * 1993-10-02 1995-04-05 Motorola, Inc. Television vertical timebase circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647065A2 (en) * 1993-10-02 1995-04-05 Motorola, Inc. Television vertical timebase circuit
EP0647065A3 (en) * 1993-10-02 1995-07-19 Motorola Inc Television vertical timebase circuit.

Also Published As

Publication number Publication date
JP3326830B2 (en) 2002-09-24

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