System and method for improving the multiplexing capability of a

Details System and method for improving the multiplexing capability of a System and method for improving the multiplexing capability of a

1980-02-15

1984-07-24

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340713, 340805, G09G 336, G09G 318

Patent

active

044620276

ABSTRACT:
A system and method for controlling the effective root mean square (RMS) voltage (Veff) across the segments of a liquid crystal display as a function of the frequency of the voltage signal applied thereto and selected parameters of the display package are described. Display parameters such as the thickness of the barrier dielectric layer and the electrical resistance of the liquid crystal material are chosen so that the ON and OFF states of the display are selectively controllable by lowering the frequency of the drive voltage signal applied to the OFF segments (Foff) a predetermined amount below that of the drive voltage signal applied to the ON segments (Fon), thereby decreasing the ratio of the effective RMS voltage Veff to the RMS voltage of the applied voltage signal (Vapp) for the OFF segments as compared to the ratio Veff/Vapp for the ON segments. The number of drive lines which can be effectively multiplexed is thereby increased. By proper selection of drive frequencies and other display parameters, temperature compensation without the need for additional sensors and circuitry is also achieved.

REFERENCES:
patent: 3760406 (1973-09-01), Walton
patent: 3891306 (1975-06-01), Mitomo et al.
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3922667 (1975-11-01), Ueda et al.
patent: 3975726 (1976-08-01), Kawakami
patent: 4028692 (1977-06-01), Ngo
patent: 4045791 (1977-08-01), Fukai et al.
patent: 4048633 (1977-09-01), Sano

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