Communications: electrical – Visual indication – Movable
Patent
1981-01-09
1983-06-28
Trafton, David L.
Communications: electrical
Visual indication
Movable
340765, 340784, 350331T, G09G 318
Patent
active
043908748
ABSTRACT:
A liquid crystal display system having improved temperature compensation using multiple capacitance ratios for different display temperature ranges. The capacitance of a liquid crystal display segment is measured when preconditioned to a first voltage below the threshold voltage and when preconditioned to a second voltage above the threshold voltage. Separate embodiments are disclosed which sequentially measure the capacitance of a single segment or which simultaneously measures the capacitance of two segments. The magnitude of the second voltage is adjusted to converge the ratio of the measured capacitances to a predetermined value selected according to the display temperature. The on segment and off segment voltages are then formed based on fixed percentages of this second voltage. In a preferred embodiment the second voltage, the on voltage and the off voltage are formed by duty cycle blanking fixed voltages according to a duty cycle blanking count which is adjusted to achieve the selected capacitance ratio.
REFERENCES:
patent: 3907405 (1975-09-01), Fukai et al.
patent: 4128311 (1978-12-01), Smith et al.
patent: 4242679 (1980-12-01), Morozumi et al.
patent: 4257045 (1981-03-01), Miles
patent: 4278325 (1981-07-01), Kondo et al.
patent: 4298866 (1981-11-01), Hodemaekers
patent: 4338600 (1982-07-01), Leach
Drury Michael J.
Woodside Robert H.
Heiting Leo N.
Marshall, Jr. Robert D.
Sharp Melvin
Texas Instruments Incorporated
Trafton David L.
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