1
Hitoshi Nohno, Masayuki Katagiri, Kiyohiro Nozaki, Kengo Takahama, Hiroyuki Iwahashi: Coordinate input device and display-integrated type coordinate input device capable of directly detecting electrostatic coupling capacitance with high accuracy. Sharp Kabushiki Kaisha, May 29, 2001: US06239788 (190 worldwide citation)

In a coordinate detection period, a first electrode drive circuit sequentially selects source electrodes Sn of the TFT LCD panel to connect the same to an x-signal current amplifying circuit, and to apply an AC voltage to the non-selected electrodes. The x-signal current amplifying circuit detects a ...


2
Takao Tagawa, Hitoshi Nohno, Kiyohiro Nozaki, Kazunari Okamura: Display-integrated type tablet device capable of detecting correct coordinates at a tip end of a detection pen by detecting external noise. Sharp Kabushiki Kaisha, David G Conlin, Kevin J Fournier, February 13, 1996: US05491706 (24 worldwide citation)

An induction voltage signal induced at a detection electrode of a detection pen is binarized by a slice voltage "e.sub.s ". The number of pulses existing in the binary signal is counted by a counting device. The resulting count value obtained by the counting device and the number of times of electro ...


3
Kiyohiro Nozaki, Takao Tagawa: Coordinate input device used for inputting characters and drawings into a personal computer/word processor. Sharp Kabushiki Kaisha, David G Conlin, Brian L Michaelis, December 29, 1998: US05854448 (23 worldwide citation)

A coordinate input device includes (1) a pen switch sensing circuit for providing a power supply to a pen switch in a position sensing pen, and for sensing that the pen switch is turned on and off and (2) a pen switch control circuit for controlling a timing of the power supply. The power supply is ...


4
Kengo Takahama, Takao Tagawa, Kiyohiro Nozaki: Display-integrated type tablet device. Sharp Kabushiki Kaisha, Birch Stewart Kolasch & Birch, October 20, 1998: US05825345 (23 worldwide citation)

During a display period (Y-coordinate detection period), an image is written to an electro-optical material so as to form a display by driving row electrodes and column electrodes by using a row-electrode driving circuit and a column-electrode driving circuit so as to selectively operate TFTs. In th ...