Abstract
The animation of LED displays for visualisation of graphics or pictures with constant or variable luminance is studied; it results from the determination of control parameter values according to the desired level of average luminance. The maximum of luminance gain shown by several types of LEDS under multiplexed excitation for a constant average current is experimentally determined; the results for green GaP:N diodes, are compared with the results of a simple analytic model in which the working temperature is considered. This maximum determines an optimum multiplexing rate. So, if we take only the behaviour of these LEDS into account, this maximum would lead to an optimum size of displays; an example of such an optimalised control assuming the visualisation of information needing several “grey” levels is given.
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