Liquid crystal image display

Details Liquid crystal image display Liquid crystal image display

G - Physics

09

G

375/39

G09G 3/36 (2006.01) H04N 3/12 (2006.01)

Patent

CA 1215186

ABSTRACT OF THE INVENTION A liquid crystal display produces a still image derived from a video signal by use of a comparator and selected reference levels to derive the driving signal for the liquid crystal display array. The vertical and horizontal samples and timing pulses derived from the original video signal of the image to be displayed are stored in shift registers, respectively and then read out into multiplexes for feeding to the liquid crystal display array. The multiplexers are analog gates that have connected thereto in addition to the shift register output signal a plurality of voltages derived from a voltage divider network that sets the level of the voltage applied across each liquid crystal device in the array. No analog-to-digital converter or multiple shift register and specialized switch combination are required and thus the operational margin or sensitivity of the liquid crystal display is not adversely affected and the driving circuit is relatively uncomplicated.

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