Method and devices for optimizing the contrast and the angle of

Details Method and devices for optimizing the contrast and the angle of Method and devices for optimizing the contrast and the angle of

1990-09-24

1992-11-10

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340765, 359 72, G09G 336

Patent

active

051627850

ABSTRACT:
A method is provided for optimizing the contrast and the angle of view of a liquid crystal display, this method consisting in periodically energizing a given zone of the display, permanently measuring the luminance of this zone so as to obtain at all times a pair of values corresponding respectively to the luminance of the zone in the energized state and to the luminance of the zone in the de-energized state, determining the contrast from the values of each of said pairs each of the measured luminance values and adjusting the control voltage of the cell display as a function of the contrast thus defined.

REFERENCES:
patent: 4760389 (1988-07-01), Aoki et al.
patent: 4788588 (1988-11-01), Tomita
patent: 5012314 (1991-04-01), Tobita et al.

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