Patent ID: 6885409

Claim:
A display system comprising: a) a display arranged to receive an image wise pattern of light to form an image, including, i) a pair of conductors, at least one conductor being transparent, ii) a layer of cholesteric liquid crystal material disposed between the conductors, the cholesteric liquid crystal material having multiple stable optical states at zero electrical field, and iii) a light absorber for forming an image wise thermal pattern in the cholesteric liquid crystal sufficient to change the optical state of the cholesteric liquid crystal in response to an image wise pattern of light; (b) a display writer, including, i) a light source for producing a flash of light of sufficient intensity to generate sufficient heat in the light absorber to change the optical state of the cholesteric liquid crystal, ii) a mask located between the light source and the display for defining the image wise pattern of light, iii) a display drive connectable to the conductors for generating an electric field between the conductors for changing the optical state of the cholesteric liquid crystal, and iv) a controller connected to the light source and the display drive for controlling the intensity of the electrical field and actuating the light source to create an image on the display.