METHOD OF COLOUR IMAGE SCREEN DISPLAYING Russian patent published in 2008 - IPC H04N9/31 

FIELD: physics.

SUBSTANCE: three light beams corresponding to three main colours are created. Each beam is directed towards corresponding spatial light modulator (SLM) to uniform by illuminate its cell array. According to video data of screen display frame, within display frame duration SLM-based spatial modulation is carried out of light power distribution by section of each of the aforesaid light beams further on reduced to single beam, and screen displayed by means of optical display system. Each element of screen displayed image corresponds to three elements located, one by one in each SLM with identical co-ordinates, respectively. Light beam flux of each main colour is shaped as periodically repeating series with display frame frequency from 2^m+1-l light pulses where m and l is a number of high-order and low-order bit, respectively, in each N=(m+l) bit signal of values corresponding to required number of G levels in screen display gradation of each main colour brightness calculated from the expression G=2^l·(2^m-1), 2^m-1 light pulses being formed with identical light power Q_O, and l pulses of light with light power Q_i=Q_O·2^-i where i=1, 2,..., l. According to an m-digit code of high-order bits of each N-bit signal generated in compliance with video data in corresponding screen display frame, for corresponding element of corresponding SLM, number K_l≤2^m-1 of light pulses with light power Q_O is isolated from pulse light flux of main colour effecting the elements of this SLM within display frame by formation of the first group from K₁ driving pulse signals, and according to number and combination of active values of l low-order bits of the same N-bit signal, light pulses in number K₂ equal to number of active values of low-order bits of the given N-bit signal are isolated from the same pulse light flux at light power Q_i dependent on order number of i low-order bits having active value by creation of the second cluster of K₂≤1 driving pulse signals. Pulse signals of the first and second cluster are supplied to corresponding, within the given frame to the given N-bit signal, element of SLM synchronously respectively with effecting light pulses at light power Q_O and light power Q_j, where j is order numbers of i low-order bits having active value.

EFFECT: essential reduction of driving pulse signal number and level number in gradation of each main colour brightness displayed on the screen.

5 cl, 7 dwg