dc.description.abstract | Recently years, the Human-Machine-Interface touch panel of the LCD(Liquid Crystal Display) becomes more popular. It makes data input and device operation more convenience, intuitive and simple. The most common solutions of the touch panel were plug-in types. There were added a touch panel module in front of screen directly. According to different principles and technologies, plug-in types can be classified into capacitive, resistive, optical and electromagnetic. These were mature technology, easy to design and implement. However, external touch panel modules must add at least one layer of glass or film in front of the display screen. It will make worse display quality, contrast and increase thickness and cost.
In view the problems of the plug-in type panel, new embedded switch touch technology has been proposed. It change the original pixel structure inside the LCD, and add touch detection circuit into the LCD source driving circuit. But previous proposals have some known problems. Proposal of Samsung will serious impact pixel aperture ratio, and it can not achieve true multi-point touch. Proposal of Philips have possible touch failure issue because of zero touch current. In this thesis, we add second thin film transistor into the pixel structure of the LCD. It is used as a touch current scan switch, and also change touch current path. Through this design, we can realize the true multi-touch input. Also can avoid possible touch input failure, and display output failure occurred.
| en_US |