Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-09-18
1989-09-05
Boudreau, Leo H.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340784, 340805, G09G 320
Patent
active
048642908
ABSTRACT:
The liquid crystal display unit 1, has a video signal receiver 2 and a store 3. Time-modulation grey-scale addressing of the ferroelectric liquid crystal pixels in a display panel 4 is provided to a store 10 which records the number of changes of state for each pixel during one picture-signal. Once the most-significant bit has been processed and is being displayed on the panel 4, the change-of-state store 10 has the net number of changes which the pixel has undergone in that picture. Controller 11 causes store 10 to output the value appropriate to that pixel and pass it to driver unit 9 to produce a compensating pulse (whether positive, negative or zero) necessary to ensure that there is no net electrical potential over the entire picture interval. The display produced by the compensating pulse is cleared immediately the first data of the next picture is input to the pixel. Assuming that the LSB of the data for a pixel already on display in panel 4, then in the next scan extractor 6 passes the next LSB to comparator 7 whose other input is connected to a pixel-state store 8. Accordingly, the new bit-value is compared with the existing state of the pixel, and comparator 7 passes on an instructing signal to pixel driver unit 9 only if the state of the pixel requires changing; in such an eventuality, the driver unit 9 issues an appropriate monopulse select voltage. Comparator 7 also passes such an instructing signal.
REFERENCES:
patent: 4508429 (1985-04-01), Nagae et al.
patent: 4525710 (1985-06-01), Hoshi et al.
patent: 4705345 (1987-11-01), Ayliffe et al.
patent: 4709995 (1987-12-01), Kuribayashi et al.
patent: 4712877 (1987-12-01), Okada et al.
patent: 4728947 (1988-03-01), Ayliffe et al.
Boudreau Leo H.
Brier Jeffery A.
Thorn Emi plc
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