method and device for optimization of the contrast of a liquid crystal display sichtwinkels.

摘要

The method according to the invention consists in periodically energising a specified zone (Z) of the display (1), in continuously measuring the luminance of this zone (Z) in such a manner as to obtain, at every instant, a pair of values corresponding respectively to the luminance of the zone in the energised state and to the luminance of the zone in the de-energised state, in determining the contrast from the values of each of the said pairs and in adjusting the drive voltage of the cell as a function of the contrast thus determined. …??The invention enables an optimum contrast to be obtained for the desire viewing angle. …IMAGE…