Led device having improved light output

Abstract

A light-emitting microcavity diode device includes a reflective electrode and a semi-transparent electrode, formed over a substrate, with an unpatterned light-emitting layer formed between the reflective electrode and the semi-transparent electrode. The reflective electrode, semi-transparent electrode, and unpatterned light-emitting layer form an optical cavity. Either the reflective or semi-transparent electrode is patterned to form independently-controllable, light-emitting sub-pixels. At least one, and fewer than all, of the sub-pixels emit light through a color filter. A first sub-pixel emits light having a first primary color and a second sub-pixel emits a complementary colored light. The light emitted from the first and second sub-pixels changes at one or more different angles. The color of the combined light of the first and second sub-pixels changes less at the one or more different angles than the light from at least one of the first or second sub-pixels. A third sub-pixel emits light through a color filter of a second primary color, different from the first primary color.

1 . A method for controlling a light-emitting microcavity diode device, comprising the steps of
 a) forming at least four independently-controllable sub-pixels, each sub-pixel formed within a microcavity, three of the sub-pixels emitting light of a primary color and at least one of the three sub-pixels having a color filter, and the fourth sub-pixel emitting light of a color complementary to one of the primary colors without a color filter,   b) receiving an RGB input signal; and   c) converting the input signal to a converted signal comprising at least four components and wherein the four components include red, green, blue, and a color complementary to one of the red, green, or blue colors.   
     
     
         2 . The method of  claim 1 , wherein the conversion step includes the step of calculating the neutral component of the input signal and preferentially applying the complementary color and the corresponding primary color to form the neutral component of the input signal. 
     
     
         3 . The method of  claim 1 , wherein the conversion step includes the step of preferentially applying the three primary colors when forming colors that are near the boundary defined by the chromaticity coordinates of the three primary colors. 
     
     
         4 . The method of  claim 1 , wherein the fourth sub-pixel emits yellow light and the complementary component is yellow.