Organic electroluminescent device and fabrication methods thereof

摘要

An organic electroluminescent device is disclosed. A substrate comprises a control area and a sensitive area. A switch device and a driving device are disposed overlying the control area. A photo sensor is disposed overlying the sensitive area, wherein the photo sensor is a thin film transistor. An OLED element is disposed in the sensitive area and illuminating to the photo sensor. A capacitor coupled to the photo sensor and the driving device. A photo current corresponding to a brightness of the OLED element is generated by the photo sensor responsive to the OLED element illuminating the photo sensor such that a the voltage of the capacitor is adjusted by the photo current to control the current passing through the driving device, thus changing the illumination of the OLED element.