04390874 is referenced by 28 patents and cites 7 patents.

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.

Title
Liquid crystal display system having improved temperature compensation
Application Number
6/223664
Publication Number
4390874
Application Date
January 9, 1981
Publication Date
June 28, 1983
Inventor
Michael J Drury
Ft. Collins
CO, US
Robert H Woodside
Lubbock
TX, US
Agent
Melvin Sharp
Leo N Heiting
Robert D Marshall Jr
Assignee
Texas Instruments Incorporated
TX, US
IPC
G09G 3/18
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