Display device capable of mode detection and automatic centering

Details Display device capable of mode detection and automatic centering Display device capable of mode detection and automatic centering

1996-05-17

1998-07-14

Lao, Lun-Yi

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345204, 345132, 348542, G09G 300

Patent

active

057811857

ABSTRACT:
A mode-detecting device is described which comprises a first and a second synchronization detecting unit which receive a vertical synchronization signal and a horizontal synchronization signal. A vertical synchronization delay unit delays the Vp section of the vertical synchronization signal by 24H of the horizontal synchronization signal. A pulse generating unit generates a pulse from the 600th clock of the clock signals of the delayed vertical synchronization signal. First and a second detecting units receive the pulse from the 600th clock as a clock input and respectively receive the vertical and horizontal synchronization signals. Upon detecting the 600th clock, the polarity of the vertical and the horizontal synchronization signals are respectively output to first and second selecting means, and can be used to determine one of a plurality of display modes so that automatic centering can be accomplished.

REFERENCES:
patent: 4060975 (1977-12-01), Yamaguchi
patent: 5111190 (1992-05-01), Zenda
patent: 5189401 (1993-02-01), Kugler, Jr. et al.
patent: 5404153 (1995-04-01), Kim
patent: 5521614 (1996-05-01), Kotha et al.

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