JPH03171884A

JPH03171884A - Multi-screen display device

Info

Publication number: JPH03171884A
Application number: JP30959989A
Authority: JP
Inventors: Hajime Mizukami; 水上　一
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1989-11-29
Filing date: 1989-11-29
Publication date: 1991-07-25

Abstract

PURPOSE:To prevent plural screens from being dispersed in the case of enlarged display by inputting plural video signals and outputting the same luminance adjustment control signal to plural television receivers, CONSTITUTION:When the enlarged display is executed by using all the screens of four television receivers 20-20, it is necessary to make same automatic contrast level control (ACL) and automatic black level control (ABL). However, when the pictures not related to the adjacent pictures are projected on the four screens, it is preferable to execute control by built-in ACL and ABL circuits. Thus, switching circuits 32-32 are changed over by a signal from a memory control circuit 18. At the time of enlarged display, the television receivers 20-20 are similarly controlled by a control signal K from a control signal output circuit 25. Thus, the plural pictures are prevented from being dispersed at the time of enlarged display.

Description

【発明の詳細な説明】（イ）産業上の利用分野本発明は、マルチビジョンと呼ばれる多画面表示装置に
関する．（ロ）従来の技術多画面表示装置は、特公昭６４−６５９２号（８０４Ｎ
５／４４）特開昭５７−１０１４８１号（ＨＯ４Ｎ５／
６８）等により良く知られている．ところで、一般のテレビジョン受像機は、例えば映像信
号のレベルに応じてＡＢＬ　（オートマチックブラック
レベルコントロール）ＡＣＬ（例えばオートマチックコ
ントラストレベルコントロール〉によりその明るさを可
変して、画面を見やすくしている（例えば、特開昭６１
−１８４０５６号、ＨＯ４Ｎ５／１６参照）。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a multi-screen display device called multi-vision. (b) Conventional technology multi-screen display device is
5/44) JP-A-57-101481 (HO4N5/
68), etc., are well known. By the way, general television receivers use ABL (automatic black level control) and ACL (automatic contrast level control) to vary the brightness depending on the level of the video signal, for example, to make the screen easier to see (for example, , Japanese Patent Publication No. 1986
-184056, HO4N5/16).

このようなテレビジョン受像機を表示装置として用いた
多画面表示装置を第２図に示す．（ｌＯ）は拡大回路で
あり、入力されたビデオ信号（Ｒ．Ｇ．Ｂ信号、コンボ
ジット信号等〉をデジタルデータに変換し、そのビデオ
信号の再生画面の任意の表示エリア部分を任意の倍率で
拡大した複数の映像信号を出力する．このため、拡大回路（ｌＯ）は、Ａ／Ｄ変換器（１２）
，表示メモリ（ｌ４）〜（ｌ４）、Ｄ／Ａ変換器（ｌ６
）〜（１６）等を有しておりメモリ制御回路（ｌ８）か
らのアドレス表示クロックの制御で表示エリア、拡大率
を制御する。表示メモリ（１４）〜（ｌ４）は表示用の
テレビジョン受像機（２０）〜（２０）に対応し、表示
メモリを拡張することにより、３×３画面、４×４画面
にも対応可能である．（ハ）本発明が解決しようとする課題複数のテレビジョン受像機（２０）〜（２０）は、夫々
の内蔵されたＡＣＬ，ＡＢＬ回路により動作する。この
ため拡大表示時に、明るい部分が主に拡大されたビデオ
信号が入力されるテレビジョン受像機（２０）と、暗い
部分が主に拡大されたビデオ信号が入力されるテレビジ
ョン受像機（２０）とでは、そのＡＢＬ．ＡＣＬによる
制御が異なる．このため、テレビジョン受像機間に於い
て、白の輝きや、黒浮きに差が生じ、拡大表示時に、バ
ランスの悪い拡大映像となる．（二）課題を解決するための手段本発明は、複数のテレビジョン受像機（２０）〜｛２０
｝と、この複数のテレビジョン受像機に複数の映像信号
を出力する拡大回路（ｌＯ）とを備える多画面表示装置
に於いて、前記複数の映像信号を入力して、前記複数のテレビジョ
ン受像機（２０）〜（２０）に同一の輝度調整制御信号
（Ｋ）を出力する制御信号出力回路（２５）を、備える
ことを特徴とする．（ホ）作　用本発明では、複数のテレビジョン受像機（２０）〜（２
０）を同様にＡＰＬ，ＡＣＬ制御する．（へ）実施例第１図を参照しつつ、本発明の一実施例を説明する。Figure 2 shows a multi-screen display device that uses such a television receiver as a display device. (lO) is an enlargement circuit that converts the input video signal (R.G.B signal, composite signal, etc.) into digital data, and displays any display area part of the playback screen of the video signal at any magnification. For this reason, the enlargement circuit (lO) outputs multiple video signals enlarged by the A/D converter (12).
, display memory (l4) to (l4), D/A converter (l6
) to (16), etc., and the display area and enlargement rate are controlled by the address display clock from the memory control circuit (18). The display memories (14) to (l4) are compatible with display television receivers (20) to (20), and by expanding the display memory, it is also possible to support 3 x 3 screens and 4 x 4 screens. be. (C) Problems to be Solved by the Present Invention The plurality of television receivers (20) to (20) operate by respective built-in ACL and ABL circuits. For this reason, during enlarged display, there is a television receiver (20) to which a video signal with mainly enlarged bright parts is input, and a television receiver (20) to which a video signal with mainly enlarged dark parts is input. So, that ABL. Control by ACL is different. For this reason, differences occur in the brightness of whites and raised blacks between television receivers, resulting in an unbalanced enlarged image when enlarged. (2) Means for Solving the Problems The present invention provides a plurality of television receivers (20) to {20
} and an enlargement circuit (lO) that outputs a plurality of video signals to the plurality of television receivers, the plurality of video signals are input to the plurality of television receivers, The present invention is characterized in that it includes a control signal output circuit (25) that outputs the same brightness adjustment control signal (K) to the devices (20) to (20). (E) Function The present invention provides a plurality of television receivers (20) to (2).
0) is similarly controlled by APL and ACL. (F) Embodiment An embodiment of the present invention will be described with reference to FIG.

この実施例は、一番明るい画面のテレビジョン受像機用
のＡＣＬ．ＡＢＬ制御信号を他の暗い部分を映出するテ
レビジョン受像機にも適用するものである．（２２）〜（２２）は各ビデオ信号のＡＰＬレベル（ア
ベレージビクチャレベル、平均輝度レベル）を検出する
ＡＰＬレベル検出回路である。（２４）は４つのＡＰＬ
レベルを比較して、ＡＰＬレベルが最大のビデオ信号の
番号を検出するＡＰＬ最大値検出回路である。（２６）
はこのＡＰＬ最大値検出回路（２４）からの番号を示す
信号により制御されて、ＡＰＬレベルが最大のビデオ信
号を選択出力するビデオスイッチ回路である。This embodiment is an ACL for a television receiver with the brightest screen. The ABL control signal is also applied to television receivers that display other dark areas. (22) to (22) are APL level detection circuits that detect the APL level (average picture level, average brightness level) of each video signal. (24) is 4 APLs
This is an APL maximum value detection circuit that compares the levels and detects the number of the video signal with the maximum APL level. (26)
is a video switch circuit that is controlled by a signal indicating the number from this APL maximum value detection circuit (24) and selectively outputs the video signal with the maximum APL level.

（２５）はＡＢＬ．ＡＣＬ用の制御信号出力回路である
。（２０’）は他のテレビジョン受像機（２０）〜｛２
０｝と同一のテレビジョン受像機であり、同様にＡＰＬ
．ＡＣＬ回路を備えている。（２０゜ａ）はＡＢＬ．Ａ
ＣＬ制御信号出力回路である．このＡＢＬ，ＡＣＬ制御信号（Ｋ）は、全てのテレビジ
ョン受像機（２０）〜（２０）に出力される。(25) is ABL. This is a control signal output circuit for ACL. (20') is another television receiver (20) ~ {2
0} is the same television receiver, and similarly APL
．． Equipped with an ACL circuit. (20°a) is ABL. A
This is a CL control signal output circuit. This ABL, ACL control signal (K) is output to all television receivers (20) to (20).

（２８）〜（２８）はＡＰＬ検出回路（２２）及びＡＰ
Ｌ最大値検出四Ｂ　（２４）での遅れを補償するディレ
イラインである。又、（３０）〜｛３０｝は前述の遅れ
とＡＢＬ．ＡＣＬ制御信号の出力のための遅れを補償す
るディレイラインである。(28) to (28) are the APL detection circuit (22) and the AP
This is a delay line that compensates for the delay in L maximum value detection 4B (24). Also, (30) to {30} are due to the aforementioned delay and ABL. This is a delay line that compensates for the delay in outputting the ACL control signal.

又、（３２）〜（３２）は制御信号切換え回路であり、
この制御信号切換え回路（３２）は、制御信号出力回路
（２０コ）からのＡＢＬ．ＡＣＬｆｆｉｌｌ御信号（Ｋ
ｌによりテレビジョン受像機をＡＣＬ．ＡＢＬ制御する
か，又は内蔵のＡＣＬ，ＡＢＬ回路でＡＣＬ，ＡＢＬ制
御するかを切り換える回路である．つまり、４つのテレ
ビジョン受像機（２０）〜（２０）の画面全てを使って
、拡大表示する場合は、ＡＣＬ．ＡＰＬを同一とする必
要があるが、４つの画面に夫々隣りの画面と関連のない
映像を映し出す場合は、内蔵のＡＣＬ，ＡＢＬ回路で制
御した方が良い．そして、このため、この切換え回路（
３２）〜（３２）はメモリ制御回路｛ｌ８｝からの信号
により、切り換えられる．そして、拡大表示時には制御
信号出力回路（２５）からの制御信号（Ｋｌにより、テ
レビジョン受像機（２０）〜｛２０｝は同様に制御され
る．｛ト）発明の効果複数のテレビジョン受像機２０〜２０のＡＢＬ．ＡＣＬ
制御が連動するので、拡大表示時に複数画面にバラツキ
が生じることがない。Further, (32) to (32) are control signal switching circuits,
This control signal switching circuit (32) outputs the ABL from the control signal output circuits (20). ACLffill control signal (K
ACL. This circuit switches between ABL control and ACL/ABL control using the built-in ACL/ABL circuit. In other words, when using all the screens of the four television receivers (20) to (20) for enlarged display, ACL. It is necessary to make the APL the same, but if you want to display images that are unrelated to the adjacent screens on each of the four screens, it is better to control them using the built-in ACL and ABL circuits. And for this reason, this switching circuit (
32) to (32) are switched by a signal from the memory control circuit {l8}. During enlarged display, the television receivers (20) to {20} are similarly controlled by the control signal (Kl) from the control signal output circuit (25). 20-20 ABL. ACL
Since the controls are linked, there will be no variation among multiple screens during enlarged display.

[Brief explanation of the drawing]

第１図は本発明の一実施例を示す図である。第２図は従来例を示す図である．（２０）・・・（２０）・・−テレビジッン受像機、（
１０）・・・拡大回路、（２５）・・・制御信号出力回路、（Ｋ）・・・ＡＢＬ、ＡＣＬ制御信号（輝度調整制御信号）FIG. 1 is a diagram showing an embodiment of the present invention. Figure 2 shows a conventional example. (20)...(20)...-Television receiver, (
10)...Enlargement circuit, (25)...Control signal output circuit, (K)...ABL, ACL control signal (brightness adjustment control signal)

Claims

[Claims]

(1) In a multi-screen display device comprising a plurality of television receivers (20) to (20) and an enlargement circuit (10) that outputs a plurality of video signals to the plurality of television receivers, the It is characterized by comprising a control signal output circuit (25) that inputs a plurality of video signals and outputs the same brightness adjustment control signal (K) to the plurality of television receivers (20) to (20). Multi-screen display device.