Abstract: An LCD projection unit employs a luminance and color balance system employing an LCD array characterization lookup table storing multiple sets of luminance and gamma correction values that are user selectable to control luminance and color balance. The lookup table values are determined by measuring the transfer function of the LCD array in the projection unit for each of a set of red (“R”), green (“G”), and blue (“B”) input data values, converting the resulting S-curve responses to corresponding sets of gamma responses and scaling the gamma responses to generate multiple R, G, and B families of luminance and gamma corrected values. Color balance is adjusted by selecting the particular R, G, and B families of luminance and gamma corrected values that cause the LCD projection unit to match a predetermined ratio of R, G, and B luminance values.

Abstract: A NTSC/PAL subcarrier based H-lock with color framing method is disclosed which makes possible color frame detection and a digital lock to horizontal sync on a NTSC or PAL video signal, using timing from a sync separator and an oscillator which is phase locked to the color burst of the input.

Abstract: Timing pulses are generated in response to an input signal which includes a train of nominally periodic pulses by determining whether a detected pulse of the input signal is a pulse of the train of nominally periodic pulses, employing a detected pulse of the pulse train to initiate cyclical production of pulses with a period dependent on the nominal period of the pulse train, and using the cyclically produced pulses to generate the desired timing pulses. In a gen-lock circuit, this arrangement facilitates acquiring lock to a noisy signal.