Patent ID: 10613387

Abstract:
A method for preventing dark banding in a liquid-crystal-on-silicon (LCoS) device, comprising illuminating, during a first timeframe, a transparent conductive layer of the LCoS device with a first illumination, the LCoS device including liquid-crystal layer between the transparent conductive layer and a reflective pixel-array. The method also includes illuminating, during a second timeframe, the transparent conductive layer with a second illumination, the second timeframe following both the first timeframe and a gap time-interval temporally between the first and second timeframes. The method also includes applying, to the transparent conductive layer, a layer-voltage equal to (i) during the first and second timeframes, an intra-frame voltage having an intra-frame root-mean-square amplitude and, (ii) during the gap time-interval, a gap voltage signal having a gap root-mean-square amplitude less than the intra-frame root-mean-square amplitude.