Device for protecting a vertical deflection integrated circuit f

Details Device for protecting a vertical deflection integrated circuit f Device for protecting a vertical deflection integrated circuit f

1996-03-08

1999-11-30

Nguyen, Chanh

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345 13, G09G 500

Patent

active

059950897

ABSTRACT:
A vertical deflection IC protection device for a monitor employing a dedicated display data channel (DDC) chip which can prevent the vertical deflection IC from being damaged by intercepting an input of a high frequency of about 25 KHz to the vertical deflection IC when monitor information data stored in the DDC chip is read out by a computer. The protection device includes a DDC section receiving a vertical sync signal from a computer I/O section and outputting DDC data to the computer I/O section when a predetermined time elapses thereafter, and a vertical frequency selection control section which intercepts the input of an abnormal vertical sync signal, which has a frequency higher than the normal vertical sync signal, to the vertical deflection IC when the abnormal vertical sync signal is inputted from the computer I/O section for the DDC data transmission.

REFERENCES:
patent: 3772563 (1973-11-01), Hasenbalg
patent: 3974420 (1976-08-01), Izura et al.
patent: 5394171 (1995-02-01), Rabii

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