The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2009
Filed:
Jan. 23, 2006
Kuan-hong Hsieh, Guangdong, CN;
Shi-quan Lin, Guangdong, CN;
Han-che Wang, Guangdong, CN;
Xiao-guang LI, Guangdong, CN;
Kuan-Hong Hsieh, Guangdong, CN;
Shi-Quan Lin, Guangdong, CN;
Han-Che Wang, Guangdong, CN;
Xiao-Guang Li, Guangdong, CN;
Hong Fu Jin Precision Industry (Shen Zhen) Co., Ltd., Shenzhen, Guangdong Province, unknown;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, Taipei Hsien, TW;
Abstract
A preferred embodiment of the touch sensing apparatus includes one or more touch sensing units, a detector, and a signal processing unit. Each touch sensing unit comprises: a differential signal source for generating two signals which have a same frequency but reverse phases; and two sensors for receiving a touch signal of a user's finger. One sensor is connected to an anode of the differential signal source, and the other sensor is connected to a cathode of the differential signal source. The detector is for converting the received signal into a digital signal. An input terminal of the detector is connected to the sensors of each touch sensing unit. The signal processing unit is for determining which sensor is touched according to the frequency and phase of the signal output from the detector. The signal processing unit is connected to an output terminal of the detector. The touch sensing unit may further include a reference signal circuit.