Colour electroluminescent display device and its driving method
First Claim
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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Accused Products
Abstract
A color electroluminescent, EL, display device comprising an array of pixels (11) each comprising sub-pixels (1) of two or more colors (R, G, B). For at least one of the colors (R, G, B), the pixel (11) comprises a first sub-pixel (RL, GL, BL) comprising a first EL material and a second sub-pixel (Rc, Gc, Bc) comprising a second EL material. The first EL material is of higher lifetime than the second EL material; the second EL material has better color points and/or better color rendition properties than the first EL material. In some embodiments a pixel comprises two red sub-pixels (RL, Rc), two green subpixels (GL, Gc) and two blue sub-pixels (BL, Bc), one sub-pixel of each color (RL, GL, BL) comprising relatively high lifetime EL material and the other sub pixel of each color (Rc, Gc, Bc) comprising relatively good color points EL material. In other embodiments a pixel comprises two blue sub-pixels (BL, Bc) but only one red sub-pixel and one green sub-pixel.
23 Citations
12 Claims
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1. A color electroluminescent (EL) display device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of driving a color electroluminescent, EL, display device, comprising:
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determining whether a predetermined color contribution to a color hue to be displayed can be provided by a first sub-pixel of a pair of color sub-pixels of a same color in a pixel, wherein the first sub-pixel of the pair comprises a first EL material and the second sub-pixel of the pair comprises a second EL material, the first EL material being of a higher lifetime than the second EL material, and the second EL material having higher color points and/or higher color rendition properties than the first EL material, wherein the first sub-pixel of the first EL material is arranged in a first row, and the second sub pixel of the second EL material is arranged in a second row directly under the first row, thereby forming a column of the same color; if a predetermined color contribution can be provided, driving the first sub-pixel but not the second sub-pixel; and if a predetermined color contribution cannot be provided, driving the second sub-pixel. - View Dependent Claims (10, 11)
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12. A driver for a color electroluminescent (EL) display device, comprising:
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a means for determining whether a predetermined color contribution to a color hue to be displayed can be provided by a first sub-pixel of a pair of color sub-pixels of a same color in a pixel, wherein the first sub-pixel of the pair comprises a first EL material and the second sub-pixel of the pair comprises a second EL material, the first EL material being of a higher lifetime than the second EL material, and the second EL material having higher color points and/or higher color rendition properties than the first EL material, wherein the first sub-pixel of the first EL material is arranged in a first row, and the second sub pixel of the second EL material is arranged in a second row directly under the first row, thereby forming a column of the same color; a means for driving the first sub-pixel but not the second sub-pixel when a predetermined color contribution can be provided by the first sub-pixel of a pair of color sub-pixels of a same color, and a means for driving the second sub-pixel when a predetermined color contribution cannot be provided.
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Specification