Pulse width modulated display with improved motion appearance

A method for displaying video images using a pulse width modulated display system including a color wheel comprising at least one red, at least one green and at least one blue color window, the method comprising the steps of;

• associating respective successive portions of each color window with corresponding respective successive equal pulse segments,
• defining each of said pulse segments by a plurality of time intervals, each time interval comprising a mulitple of one LSB time interval;
• allocating drive pulses for pixels of said display system to time intervals of said pulse segments to represent a first range of brightness values for said display;
• such that the time interval allocated for displaying a given bit of said brightness values varies between a first time interval and at least a second time interval over said first range of brightness values.

A method for displaying video images using a pulse width modulated display system including a color wheel comprising at least one red, at least one green and at least one blue color window, the method comprising the steps of;

• associating respective successive portions of each color window with corresponding respective successive pulse segments, each pulse segment defined by a plurality of time intervals for providing drive pulses to pixels of said display system in synchronization with rotation of said color wheel to display said video images;
• distributing said drive pulses with respect to said pulse segments to define a range of brightness values by steps of:
• allocating at least one drive pulse to a first pulse segment corresponding to a middle portion of said color window to represent a lowest brightness level;
• representing incremental increases in brightness level above said lowest brightness level by allocating additional drive pulses only to said first pulse segment until all said time intervals of said first pulse segment are associated with a drive pulse;
• and,
• next, allocating drive pulses to at least a second pulse segment corresponding to a portion of said given color window different than said middle portion, thereby providing a pulse sequence distribution for said system that avoids motion artifacts in said images.

A system for displaying video images comprising:

• a light source;
• an array of pixel elements responsive to drive pulses for illumination by said light source in accordance with brightness values of a video signal;
• a color wheel comprising at least one red, at least one green and at least one blue color window interposed between said light source and said array of pixel elements to provide color illumination of said pixel elements;
• a processor for associating respective successive portions of each color window with corresponding respective successive pulse segments, said pulse segments comprising sequences of said drive pulses, said sequences defining brightness levels for pixels of said array;
• said sequences comprising pulses distributed about a middle one of said successive segments.