A Kind of Improved Drive Interface Circuit for AMOLED

This paper presents an improved Drive Interface Circuit (DIC) of signal transformation for Active-matrix Organic Light Emitting Diode (AMOLED) display. The proposed circuit consists of a multi-format signal interface, a power management, and a signal decoder controlled by a MCU. A novel method of display parameters real-time correction is applied to keep the consistency of display parameters throughout the temperature range. The proposed circuit has the following features. The circuit can directly transform analog signal into Low-Voltage Differential Signaling (LVDS) level instead into TTL level then into LVDS level. Secondly, the circuit can acquire the environment temperature in real-time status and adjust the display parameters (e.g. brightness, color temperature) accordingly. Besides, built-in software with On Screen Display (OSD) function is designed to get the circuit to work well. It also adds a switch circuit to solve the problem of enable control of voltage between AMOLED's anode and cathode. Some problems are discussed at the end.