Patent ID: 7133009
Filing Date: 2006-11-07
Classification: G09G,H05B

Abstract:
1. A multiplexed matrix alternating current (AC) electroluminescent display, comprising: an array of matrix addressed capacitively switchable electroluminescent pixels, each capacitively switchable electroluminescent pixel including an electroluminescent pixel having an EL threshold voltage across said electroluminescent pixel and a circuit element connected in electrical series with said electroluminesent pixel, said circuit element being switchable at a first threshold voltage across said circuit element between an electrically insulating capacitive state and an electrically conducting state when a magnitude of an AC voltage applied across said capacitively switchable electroluminescent pixel is such that a voltage drop across said circuit element reaches said first threshold voltage, wherein each capacitively switchable electroluminescent pixel exhibits a first capacitance when the magnitude of the AC voltage applied across said capacitively switchable electroluminescent pixel is such that the voltage drop across said circuit element is less than said first threshold voltage and substantially no EL light emission occurs, and when the magnitude of the AC voltage applied across said capacitively switchable electroluminescent pixel is such that the voltage drop across said circuit element is larger than said first threshold voltage and a voltage drop across said electroluminescent pixel is smaller than the EL threshold voltage, said capacitively switchable electroluminescent pixel exhibits a second capacitance larger than said first capacitance but with substantially no EL light emission, and when the magnitude of the AC voltage applied across said capacitively switchable electroluminescent pixel is such that the voltage drop across said electroluminescent pixel is larger than said EL threshold voltage EL light emission occurs from said capacitively switchable electroluminescent pixel; and power supply means connected to said array of matrix addressed capacitively switchable electroluminescent pixels for providing power to each capacitively switchable electroluminescent pixel.