Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1992-10-27
1995-04-04
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345132, G09G 300
Patent
active
054041538
ABSTRACT:
The conventional super VGA (video graphic array) monitor interface circuit controls the output mode of the monitor according to the width and polarity of vertical and horizontal synchronizing input signals, so it has disadvantage that it is difficult to control the output mode of the monitor when the width and polarity of the vertical and horizontal synchronizing input signals are different according to the kind of video cards. The present invention is such that the vertical and horizontal synchronizing signals are employed as an input signal. If the input signal is negative polarity, it is converted to positive polarity for output and, if the input signal is positive polarity, it is output with positive polarity. The signal separating part divides the input signal connected to the above polarity converting part into an 800.times.600 mode, a 1024.times.768 mode or any other mode. An output part which is connected to a polarity converting part and signal separating part outputs a control signal needed in a monitor by dividing the input signal into each mode. Thus, the present invention relates to the super VGA monitor interface circuit which solves conventional problems in the art by controlling the output mode of the monitor only by an input signal frequency regardless of the width and polarity of the vertical and horizontal synchronizing input signals.
REFERENCES:
patent: 4727362 (1988-02-01), Rackley et al.
patent: 4792857 (1988-12-01), Akiyama
patent: 4916442 (1990-04-01), Kim
patent: 4935731 (1990-06-01), Takebe et al.
patent: 4990902 (1991-02-01), Zenda
patent: 4991023 (1991-02-01), Nicols
patent: 5153886 (1992-10-01), Tuttle
patent: 5159327 (1992-10-01), Yi
Samsung Electron Devices Co. Ltd.
Weldon Ulysses
Wu Xiao M.
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