Toppoly Optoelectronics Corporation

Tpo Displays Corporation

Ying-Hsin Li

An Shih

Ming-Dou Ker

Tang-Kui Tseng

Chih-Kang Deng

Sheng-Chieh Yang

Wei-Jen Hsu

A level shifter is provided. The level shifter includes a first input transistor, a second input transistor, a first bias transistor, a second bias transistor, a first switch transistor and a second switch transistor. At the time of change of the signal status, by raising the potential of the body terminal of the first input transistor, the threshold voltage is reduced so that the current flowing through the second input transistor is increased to shorten the time of the change of the signal status.

Level shifter

A method and a structure of a diode are provided. The diode is used in an electrostatic discharge protection circuit using TFT (Thin Film Transistor) fabrication technology. A semiconductor layer is formed on a substrate. A first region of a first carrier concentration is formed in the semiconductor layer. A second region of a second carrier concentration is formed in the semiconductor layer. An insulator is formed on the semiconductor layer. The insulator layer is etched to form at least a contact window. The contact window exposes a portion of an upper surface of the semiconductor layer. A metal layer is formed on the insulator layer. The metal layer fills up the contact window to contact the semiconductor layer.

Method and structure of diode

A testing circuit and a testing method for a flat panel display. The testing circuit is provided to each input terminal of data lines of a data driving circuit, which is integrated into the flat panel display. The testing circuit is for testing performance of a pixel as well as performance of the data driving circuit in the flat panel display.

Circuit and method for testing a flat panel display

A source follower capable of compensating the threshold voltage is provided. The source follower comprises a current source, a switching circuit, and a thin film transistor. The source follower makes the threshold voltage of the thin film transistor constant by using the current source, and makes the input voltage nearly equal to the output voltage by using the storage capacitor and the compensating capacitor. Thus, it can make the error of the output voltage fall in the error range of the gray level voltage.

Growing community of inventors

Kaohsiung, Taiwan

Ying-Hsin Li