ELECTROLUMINESCENT DISPLAY DEVICES

摘要

An active matrix display device comprises an array of display pixels provided over a common substrate ( 60 ). Each pixel has an upwardly emitting current-driven light emitting display element ( 2 ) comprising a lower electrode ( 74 ) and an upper substantially transparent electrode ( 80 a. A light sensitive device ( 27 ) for sensing the display element ( 2 ) light output is positioned between the substrate ( 60 ) and the display element ( 2 ), and a drive transistor ( 22 ) is controlled in response to the light-sensitive device ( 27 ) output. The lower electrode ( 74 ) of the display element is partially transmissive to transmit at most 20% of the light incident on the lower electrode, at least a portion of the transmitted light being directed to the underlying light-sensitive device ( 27 ).