DRIVE CONTROLLER, PROGRAM, AND DISPLAY SYSTEM

To suppress generation of allophones in an LED display device of a passive matrix drive system.SOLUTION: A virtual scan blanking period of time is set as a turn-off period of time in one frame so that each virtual scan blanking period of time will be the same period of time to the interval of a scan...

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Bibliographische Detailangaben
Hauptverfasser:	OKAZAKI SHUMA, TAKAMIYA KOJI, EMA HIROTOMO, YAMASHITA MIHO, MATSUMOTO KENGO, SAKURAI HISAO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION BASIC ELECTRIC ELEMENTS CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY PHYSICS SEALS SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:	To suppress generation of allophones in an LED display device of a passive matrix drive system.SOLUTION: A virtual scan blanking period of time is set as a turn-off period of time in one frame so that each virtual scan blanking period of time will be the same period of time to the interval of a scan blanking period of time. In that way, the number of generations of a ripple voltage is increased and an allophone larger than an audible range is generated, whereby the allophone is not perceived as an allophone. The present invention is applicable to an LED display device of a passive matrix drive system.SELECTED DRAWING: Figure 20 【課題】パッシブマトリクス駆動方式のLED表示装置において異音の発生を抑制できるようにする。【解決手段】１フレーム内において、スキャンブランキング期間の間隔に対して均等の間隔になるように消灯期間となる仮想スキャンブランキング期間を設定する。これによりリップル電圧の発生回数を増やして、可聴帯域を超える異音が発生するようにすることで、異音と知覚させないようにする。パッシブマトリクス駆動方式のLED表示装置に適用することができる。【選択図】図２０