Patent ID: 9030506
Filing Date: 2015-05-12
Classification: G09G

Abstract:
1. A display panel, comprising: a plurality of pixel circuits arranged in columns and rows relative to a substrate, each of the pixel circuits including a light emitting device that is turned on or off by a drive transistor; a controller; a controllable current source or sink circuit controlled by the controller that controls a supply of a bias current to at least one of the columns of the pixel circuits in the display panel; and a current source or sink address driver controlled by the controller that activates selected one or ones of the columns of the pixel circuits to receive the bias current; wherein the controllable current source or sink circuit includes an arrangement of transistors and a first capacitor such that a voltage across the first capacitor is determined by device parameters of a first of the transistors, whereby the bias current supplied by the controllable current source or sink circuit is stable and compensated for variations in the device parameters.