Patent ID: 9093028
Filing Date: 2015-07-28
Classification: G09G

Abstract:
1. A circuit for a pixel of a display, the circuit comprising: a controllable supply voltage source outputting a supply voltage; an organic light emitting device emitting light having a brightness level as a function of current flow; a drive transistor having one terminal coupled to the controllable supply voltage source and a second terminal coupled to the organic light emitting device, the drive transistor having a gate input controlled by a voltage input to determine the current flow through the organic light emitting device; and wherein the supply voltage output by the controllable supply voltage source, operate said drive transistor in a saturation region during a normal operation mode when said gate input is above a predetermined threshold voltage, and operate said drive transistor in a linear operation region by reducing the gate input voltage when the voltage input of a desired brightness is below a predetermined threshold thereby reducing an effect of a voltage drop across the drive transistor.