Patent ID: 7916099
Filing Date: 2011-03-29
Classification: G09G

Abstract:
1. An active matrix electroluminescent display device comprising an array of display pixels arranged in rows and columns, each pixel comprising: an electroluminescent (EL) display element; a drive transistor for driving a current through the display element; means for directly interrupting the drive of current through the display element via a direct interrupt signal, said direct interruption means being provided in series with the electroluminescent display element; and row driver circuitry for generating control voltages to be applied to the pixels in each row in sequence including a drive voltage as input to the interrupting means, wherein the row driver circuitry comprises a shift register arrangement and logic arrangement for generating the drive voltage for the interrupting means, the drive voltage for the interrupting means including a long emission time pulse for controlling the output of the display element, the long emission time pulse having a duration which can be varied up to substantially the full field period less the address period, and wherein the timing of the end of the long emission time pulse corresponds to the timing of the direct interrupt signal generated by the interrupting means for controlling the display element illumination time, wherein the signal or signals propagated through the shift register arrangement control the pulse duration.