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.

Abstract: A liquid-crystal display (LCD) system with reduced artifact has LCD pixel cells with transparent and pixel electrodes. A timing control that switches one of the transparent and pixel electrodes in a sequence of high, common, low, and common voltages; synchronized to a timing control that switches a second electrode in a sequence of a first data-dependent, common, a second data-dependent, and common voltages. This new timing base LC voltage control enables smooth polarity switching that prevents optical side effects by excessive voltage across LC.

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.

Abstract: A liquid-crystal display (LCD) system with reduced artifact has LCD pixel cells with transparent and pixel electrodes. A timing control that switches one of the transparent and pixel electrodes in a sequence of high, common, low, and common voltages; synchronized to a timing control that switches a second electrode in a sequence of a first data-dependent, common, a second data-dependent, and common voltages. This new timing base LC voltage control enables smooth polarity switching that prevents optical side effects by excessive voltage across LC.

Abstract: When performing capacitive sensing, a modulated signal is driven on transmitter electrodes located only within a black image of the display device. When updating a display screen based on a newly received display frame, an input device may first insert the black image on the display screen. Once the black image is displayed, the input device may use the electrodes within the area of the screen displaying the black image to track the input object using capacitive sensing (e.g., determine if the user is pressing a finger or stylus on the screen). In this manner, performing capacitive sensing affects only the pixels displaying the black image which is not perceived by the user. After performing capacitive sensing using the electrodes, the input device may replace the black image with display data from the new display frame.

Abstract: Embodiments of the invention generally provide, when performing capacitive sensing, driving a modulated signal on transmitter electrodes located only within a black image of the display device. When updating a display screen based on a newly received display frame, an input device may first insert the black image on the display screen. Once the black image is displayed, the input device may use the electrodes within the area of the screen displaying the black image to track the input object using capacitive sensing (e.g., determine if the user is pressing a finger or stylus on the screen). In this manner, performing capacitive sensing affects only the pixels displaying the black image which is not perceived by the user. After performing capacitive sensing using the electrodes, the input device may replace the black image with display data from the new display frame.