Frequency switching method and circuit for display unit

H - Electricity – 04 – N

Patent

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H04N 7/01 (2006.01) G09G 5/00 (2006.01)

Patent

CA 2197140

The present invention relates to a frequency switching method and circuit for display unit. When power supply of display unit is ON, a power-saving circuit produces a microprocessor action voltage for the control of vertical, horizontal synco output, and base frequency 31KHZ - 38KHZ is adjusted into 15KHZ. when display unit is used as a monitor, it may still have all 15K CGA and VGA functions, and when combined with VISION BOX, it may be increased with TV, LD, CD, HiFi system. CATV functions, and super picture quality can be accomplished through the characteristics of 15KHZ linear line without distortion.

Méthode et circuit de commutation de fréquence pour unité d'affichage. Lorsque l'alimentation d'une unité d'affichage est en marche, un circuit d'économie d'énergie amène un microprocesseur à produire une tension pour la commande de sortie de synchronisation verticale et horizontale, et la fréquence de base de 31 kHz à 38 kHz est réglée à 15 kHz. Lorsque l'unité d'affichage est utilisée comme moniteur, elle peut conserver toutes les fonctions CGA et VGA 15 kHz, et, combinée avec VISION BOX, elle peut être équipée d'un système haute fidélité TV, disque laser, CD. Les caractéristiques de ligne 15 kHz sans distorsion permettent des fonctions de câblodistribution et une qualité d'image supérieure.

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