Abstract:
An active matrix type organic light emitting diode device and a thin film transistor thereof are disclosed in the present invention. The driving thin film transistor for an active matrix type organic light emitting diode (AMOLED) device having first and second electrodes spaced apart from each other and an organic light emitting layer disposed between the first and second electrodes includes a gate electrode on a substrate, a semiconductor layer over the gate electrode, and source and drain electrodes on the semiconductor layer, wherein the source and drain electrodes are spaced apart from each other and respectively overlap portions of the gate electrode, and an overlapping area between the gate electrode and the source electrode is larger than an overlapping area between the gate electrode and the drain electrode.
Abstract:
An analog buffer includes a first switch and a first capacitor for receiving an analog signal, a comparing unit for compensating a voltage change of an output signal applied to a line upon receiving the analog signal through the first switch and the first capacitor, a second switch connected across an input terminal and an output terminal of the comparing unit, a third switch connected across the comparing unit, the first switch and the first capacitor and a fourth switch connected between the output terminal of the comparing unit and the line.
Abstract:
A driving circuit for a liquid crystal display device includes a reference voltage source, a first switch connected to the reference voltage source, a second switch connected to the first switch, a PUMP signal generator connected to the first and second switches, the PUMP signal generator oppositely adjusting the first and second switches, a capacitive element connected to the first and second switches, a third switch connected to the second switch, and a reset voltage source connected to the third switch.
Abstract:
An organic electroluminescent device of the present invention includes: a gate line and a data line formed over a substrate, the gate and data lines perpendicularly crossing each other and defining a pixel therebetween; a first driving unit formed in the pixel and comprised of a first switching TFT and a first driving TFT; a power line delivering a current signal to the first driving TFT; an organic electroluminescent diode contacting the first driving TFT and receiving the current signal from the first driving TFT; and a second driving unit formed in the pixel and comprised of a second switching TFT and a second driving TFT, the second driving unit being a backup circuit that can deliver the current signal from the power line to the organic electroluminescent diode when the first driving unit malfunctions.