Dot clock generator for liquid crystal display device

Details Dot clock generator for liquid crystal display device Dot clock generator for liquid crystal display device

1994-09-30

1995-12-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

3151694, 375373, 375376, 348500, 345100, G09G 310

Patent

active

054790735

ABSTRACT:
To generate a dot clock for a liquid crystal display device from a horizontal sync signal with reduced skew, a phase locked loop (PLL) is divided into three functional parts. The first part generates a particular frequency by supplying voltage from a latch type DAC (digital/analog converter) to a VCO (voltage controller oscillator). A horizontal sync signal is estimated from the dot clock signal that is finally generated and the output value of the DAC is increased or decreased in accordance with the difference between this estimated horizontal sync signal and the actual horizontal sync signal. This increase or decrease correction is made at, for example, the vertical sync timing. The second part achieves synchronization. A signal corresponding to the phase error between the actual horizontal sync signal and the dot clock signal is added to the signal from the DAC to control the phase of the dot clock. The third part is a PLL for generating the dot clock in accordance with the signal generated by the first part at the particular frequency.

REFERENCES:
patent: 3769602 (1973-10-01), Griswold
patent: 3895372 (1975-07-01), Kaji et al.
patent: 4574315 (1986-03-01), Yoshimura
patent: 4893319 (1990-01-01), Ziuchkovski
patent: 5019807 (1991-05-01), Stapleton et al.
patent: 5066893 (1991-11-01), Osada et al.
patent: 5359343 (1994-10-01), Nakamura

Affiliated with

Also associated with

Rating

Dot clock generator for liquid crystal display device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dot clock generator for liquid crystal display device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dot clock generator for liquid crystal display device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1371059