Feedback architecture for uniform brightness in TFT AMOLED displays

A novel feedback current programming principle, compatible with 2T1C pixel structure AMOLED displays is described and a new driver circuit is proposed which can compensate for both the threshold voltage and mobility non- uniformities of the pixel drive TFT. Circuit simulations demonstrated that a pixel drive current of less than 100nA can be programmed with less than 10% of error even if the mobility varies by an order of magnitude.