P‐31: A New Threshold Voltage Compensation Technique of Poly‐Si TFTs for AMOLED Display Pixel Circuit

Abstract

AbstractA new threshold voltage compensation technique of polycrystalline silicon thin‐film transistors (poly‐Si TFTs) for Active Matrix Organic Light Emitting Diode (AMOLED) displays pixel circuits is presented. The new technique was applied on the conventional 2‐transistors‐1‐capacitor (2T1C) pixel circuit and a new voltage‐programmed pixel circuit (VPPC) is proposed. Theoretically, the proposed pixel is the fastest pixel with threshold voltage compensation reported in the literature since the new compression technique is implemented with a static circuit block which does not affect the response time of the conventional 2T1C pixel circuit. Furthermore, the new pixel exhibits all the other advantages of the 2T1C pixel, like the simplicity of the peripheral drivers and improves other characteristics like its behavior in the temperature variations. The verification of the proposed pixel is made through simulations with HSpice. In order to obtain realistic simulations, device parameters were extracted from fabricated LT poly‐Si TFTs.