Patent ID: 7791565
Filing Date: 2010-09-07
Classification: G09G,H01L

Abstract:
1. A color electroluminescent (EL) display device comprising: an array of pixels; wherein each pixel comprises two separate sub-pixels for each color of two or more main colors, a first separate sub-pixel comprising a first EL material and a second separate sub-pixel having the same color as the first separate sub-pixel comprising a second EL material; wherein the first EL material is of a higher lifetime than the second EL material, the second EL material has a higher color point and/or higher color rendition properties than the first EL material; and wherein the sub-pixels of the two or more main colors of the first EL material are arranged in a first row, and the sub pixels of the two or more main colors of the second EL material are arranged in a second row directly under the first row forming columns, wherein sub-pixels of a same main color are in a same column; wherein the display device further comprises circuitry arranged to drive the display device such that when a color or color hue to be displayed by the pixel can be provided with a predetermined color contribution of the main color of the first and second sub-pixels by driving the first sub-pixel without driving the second sub-pixel, then the first sub-pixel is driven but not the second sub-pixel: and wherein the circuitry is further arranged such that when the color or color hue to be displayed cannot be provided with a predetermined color contribution of the main color of the first and second sub-pixels by driving the first sub-pixel without driving the second sub-pixel then the second sub-pixel is driven.