Patent ID: 8026871
Filing Date: 2011-09-27
Classification: G09G,H01L

Abstract:
1. A display comprising: a plurality of light emitting diode display elements, a plurality of row and column electrodes connected to said plurality of light emitting diode display elements, and a driver for the display, the driver comprising: addressing circuitry to address said display elements; a first driver component to cooperate with said address circuitry to provide a forward drive to at least one of said display elements to illuminate the display element; a second driver component to provide a reverse bias drive to others of said display elements at the same time as said at least one display element is illuminated to reduce a level of photoluminescence from said others of said display elements; a power supply to generate a voltage for said second driver component from a positive voltage supply for said first driver component; a plurality of column switches to connect each column electrode to the first driver or to ground; and a plurality of row switches to selectively connect each row electrode to the second driver component or to ground; wherein the driver is configured to address said display by row-wise scanning by selectively connecting a row to ground and selectively connecting at least one column electrode to the first driver component whereby said at least one display element is illuminated; wherein the second driver component is configured to provide sufficient reverse bias drive so that all non-scanned display elements connected to the same column electrode as said at least one illuminated display element are reverse biased even though the non-scanned display elements are connected to the first driver component which provides said forward drive to said at least one display element; wherein the output of the second driver component is greater than the output of the first driver component and wherein the difference between the output of the second driver component and the output of the first driver component is controlled to provide a reduction in photoluminescence, with all display elements off, of at least 50% under an illuminance of at least 1000 lux from a source approximating a black body at a temperature of 5400K.