Patent ID: 8125414

Claim:
An electroluminescent (EL) display device comprising an array of display pixels, each display pixel comprising an EL display element and a driving circuit that is configured to drive the EL display element based on a data signal and a supply voltage and a mode controller that is configured to control the supply voltage to each display pixel, wherein: each pixel is operable in first and second modes, wherein: in the first mode, the mode controller is configured to provide a first value of the supply voltage to place a driving transistor in the driving circuit in a linear mode, so that an analogue current is supplied to the EL display element by the driving circuit in dependence on the data signal supplied to the pixel, and in the second mode, to provide a second value of the supply voltage to place the driving transistor in a switching mode, so that one of two voltages is provided across the EL display element by the driving circuit in dependence on the data signal supplied to the pixel; the first value of the supply voltage is configured to provide a first voltage drop across the driving transistor; the second value of the supply voltage is configured to provide a second voltage drop across the driving transistor; and the second voltage drop is substantially less than the first voltage drop.