Patent ID: 7745987

Claim:
An organic electroluminescent display device comprising: a plurality of pixels located above a substrate, each pixel being formed of two light-emitting elements and producing only two different colors of predetermined chromaticity values, wherein each light-emitting element is formed by interposing a luminescent layer containing organic electroluminescent materials between a pair of electrodes, the light-emitting elements being arranged in a plurality of independent array patterns, wherein a mixture of the two different colors produces colors falling within a line segment between two different colors by controlling each gradation of the two light-emitting elements in a ClExy chromaticity diagram, wherein a part of the color falling within the line segment produce colors falling within a circular area of a 0.1 radius with a center in a pure white coordinate of 0.31, 0.36 in the ClExy chromaticity diagram, and wherein the two light-emitting elements are driven by different electric currents or voltages to achieve a quasi-color display.