Koninklijke Philips Corporation N.V.

Neil M Johnson

Iwo-Martin Mergler

A display arrangement is disclosed comprising a flat panel display device having an array of pixels, and a driving circuit arrangement for switching each of the pixels between two intensity levels at a rate greater than the frame refresh rate so as to produce the visible effect of intermediate intensity levels. In particular, the driving circuit comprises a plurality of intensity level error registers, one for each intermediate intensity level; means for selecting one of the intensity level error registers according to.a signal representative of the visible effect of the intermediate intensity level that it is desired that a particular pixel should produce; means for setting the particular pixel to either a first or second intensity level depending on the value contained in the selected error register; and means for updating the value contained in the selected register by adding a value corresponding to the first or second intensity level to which the particular pixel was set, subtracting a value corresponding to the intermediate intensity level, the visible effect of which it is desired that the particular pixel should produce, and adding a random number.

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Harefield, United Kingdom

Neil M Johnson