Industrial Technology Research Institute

Prime View International Co. Ltd.

Fang-Chien Kuo

Sywe N Lee

Huann-Min Tang

David A Wayne

The number of external column driver chip can be reduced to one in an active matrix liquid crystal display with column input multiplexing driving scheme. At least two sample and hold circuits are used for each column with alternate sampling and holding periods. Video signals are sampled and held at least twice during one line scanning time. These sample and hold circuits are all integrated in the driver chip.

Sample and hold circuit for drivers of an active matrix display

This invention provides a method for scanning a thin film transistor liquid crystal display which eliminates the undesirable brightness fluctuations in the display due to parasitic capacitance. When conventional scanning methods are used in thin film transistor liquid crystal displays parasitic and other capacitances in the array cause fluctuations in brightness of the pixels. This method scans multiple rows of the display simultaneously and still eliminates the brightness fluctuations of the pixels.

Over line scan method

This invention provides a method for scanning a thin film transistor liquid crystal display which eliminates the undesirable brightness fluctuations in the display due to parasitic capacitance. When conventional scanning methods are used in thin film transistor liquid crystal displays parasitic capacitance between the gate of the thin film transistors and the pixels causes fluctuations in brightness of the pixels. This method scans only one row of the display at a time and the brightness fluctuations of the pixels are eliminated.

Growing community of inventors

Hsinchu, Taiwan

Fang-Chien Kuo