Patent ID: 6346936
Filing Date: 2002-02-12
Classification: G09G

Abstract:
A driving device for a liquid crystal display device for sampling video signals at a fixed period to display a color image on a panel, wherein a timing circuit for generating a sampling pulse includes:a PLL circuit for generating and synchronizing a clock signal for sampling an input video signal, said PLL circuit comprising: a voltage control type oscillator for generating an oscillation frequency, a phase comparator for comparing and synchronizing said oscillation frequency with the phase of said input video signal, and a frequency divider for generating said clock signal by frequency dividing the phase synchronized oscillation frequency; a phase shifter for shifting the phase of said clock signal to vary the sampling phase between even and odd lines of said input video signal to be displayed and to further vary the sampling phase for every other line of said input video signal; and a timing generator unit for generating said sampling pulse on the basis of the phase shifted clock signal; said sampling pulse alternating the phase relationship for every line and every field of said input video signal, thereby providing a visual filtering effect.