Compensation scheme for electrochromic displays

Details Compensation scheme for electrochromic displays Compensation scheme for electrochromic displays

G - Physics

09

G

375/37, 345/6

G09G 3/00 (2006.01) G02F 1/163 (2006.01) G04G 9/00 (2006.01)

Patent

CA 1129570

PI-546 COMPENSATION SCHEME FOR ELECTROCHROMIC DISPLAYS ABSTRACT A driving circuit for an electrochromic display cell wherein writing and erasing of a segment is effected by relatively high write and erase transition potentials. After a predetermined transition period, the written and erased segments are stabilized at a desired coloration or transparency by application of a maintaining write potential(s) and a main- taining erase potential(s) respectively. The write maintain potential is periodically adjusted to a level whereby a predetermined charge level is maintained on the written segments. In this manner, a maintain potential on the segment(s) is periodically adjusted to compensate for degradation of the electrochromic material and to thereby maintain the desired contrast ratio between the written and erased segments.

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