Method and apparatus for actuating a liquid crystal display with

Details Method and apparatus for actuating a liquid crystal display with Method and apparatus for actuating a liquid crystal display with

1986-05-07

1988-07-19

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

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

350335, 340784, 340765, G02F 113, G09G 318, G09G 336

Patent

active

047580690

ABSTRACT:
The invention is relative to a method of statically (non-multiplexed) actuating a liquid crystal display which comprises several segments and a common back electrode, using a microprocessor which serially outputs the data to be displayed, and using a serial/parallel converter which statically makes the data to be displayed available for each segment of the liquid crystal display. The invention has the task of achieving recognition of functional error as follows: The data to be displayed is outputted approximately every 0.1 second by the microprocessor and the data for the individual segments and for the back electrode is inverted at every second data output. The failure of components then results in a blinking of the particular segment and is conspicuously indicated in this manner. In the case of alternating voltage actuation of the liquid crystal display, it is advantageous if the clock pulse of the alternating voltage actuation is also inverted at every second data output.

REFERENCES:
patent: 4065764 (1977-12-01), Houryu
patent: 4236150 (1980-11-01), Chern
patent: 4241344 (1980-12-01), Kmetz et al.
patent: 4247852 (1981-01-01), Utzinger

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