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Colour electroluminescent display device and its driving method

  • US 7,791,565 B2
  • Filed: 04/15/2005
  • Issued: 09/07/2010
  • Est. Priority Date: 04/16/2004
  • Status: Active Grant
First Claim
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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.

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