06515654 is referenced by 9 patents.

A touch-type pointing device with wireless input capability is disclosed, which includes a touch unit and a sensing pen. The touch unit has a transparent electrode and a control circuit connected to the transparent electrode for detecting a variance of impedance in the transparent electrode to obtain a signal representing a coordinate point, and transmitting and receiving signals. The sensing pen has a plurality of switches, each being closed to form a LC loop for transmitting signals in response to the signals from the touch unit.

Title
Touch-type pointing device with wireless input capability
Application Number
9/687425
Publication Number
6515654 (B1)
Application Date
October 13, 2000
Publication Date
February 4, 2003
Inventor
Cheng Yuan Liao
Taoyuan
US
Agent
Hamilton Brook Smith & Reynolds P C
US
Assignee
Taiwan Regular Electronics
US
IPC
G09G 5/00
View Original Source