Color selective light modulators employing birefringent stacks

摘要: The present invention provides a high brightness subtractive color filter formed by an electro-optic modulator positioned between two retarder stacks. second stack echoes the first stack, having same sequence of retardances but in reverse order and orientation rotated with respect to stack. changes apparent so that, switching state stacks cooperate filtering spectrum input light, they vanish, leaving white light. Two or more stages can be used series, each stage providing independent analog control primary color. One preferred embodiment eliminates internal polarizers stages, thereby full-color display only neutral polarizers. Hybrid filters made using this combination other active passive filters. many applications, particularly areas recording displaying images. They arranged multi pixel array optically addressed.