Voltage dimmable led display producing multiple colors

摘要

Multi-color illumination for a single display 110 is achieved by utilizing an array 104 of white light emitting diodes to produce illumination optically filtered by separate filters 107a 107d to produce the two or more desired output illumination colors at a desired luminance when 5 the full rated voltage is applied to the light emitting diodes 104. Since all of the light emitting diodes 104 have the same bandgap, voltage-controlled dimming produces uniform luminance changes for all colors as the voltage is reduced. A single voltage-controlled dimming driver circuit design 200 and a single control voltage may therefore be utilized to achieve desired and uniform dimming characteristics independent of output illumination color.