Patent ID: 8836615
Filing Date: 2014-09-16
Classification: G09G,G11C,H02H,H05B,Y02B

Abstract:
1. A circuit including: a light emitting element, a transistor for current control, a first capacitor, a first switching transistor arranged in a series-connection with the light emitting element, the transistor for current control, and the first capacitor, wherein the series-connection is connected between a first voltage and a second voltage, and the first switching transistor is controllable to conduct or interrupt a current in a first or a second operating phase, respectively, a second switching transistor, a second capacitor being connected to a control terminal of the transistor for current control, for storing a control voltage applied thereto to the control terminal of the transistor for current control via a control line and the second switching transistor during a programming phase, wherein a current charging the first capacitor during the first operating phase is passed through the light emitting element and wherein the transistor for current control is a source follower transistor, thereby charging the first capacitor with a difference voltage between the control voltage applied to the second capacitor in the programming phase and a gate-source threshold voltage of the transistor for current control, and a third switching transistor being connected to the first capacitor for discharging the first capacitor in the second operating phase.