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:
Sep. 11, 2018
Filed:
Jan. 02, 2018
Darfon Electronics Corp., Taoyuan, TW;
Chien-Hsin Lee, New Taipei, TW;
Wei-Chan Sung, Taichung, TW;
DARFON ELECTRONICS CORP., Taoyuan, TW;
Abstract
A keyboard device includes M driving circuits DC()˜DC(M), N transition circuits TC()˜TC(N), a control module, M column signal lines C()˜C(M), N row signal lines R()˜R(N) and M*N key units KU()˜KU(M,N). The control module performs a scanning process to sequentially scan the M column signal lines C()˜C(M) in M scan cycles scan()˜scan(M). If the key unit KU(k,x) connected with the k-th column signal line C(k) and the x-th row signal line R(x) is depressed, a scan voltage is transmitted from the k-th column signal line C(k) to the x-th row signal line R(x) through a switch sw(k,x) of the key unit KU(k,x). The transition circuit TC(x) connected with the x-th row signal line R(x) is turned on according to the scan voltage. Consequently, an output voltage Rout(x) from the transition circuit TC(x) has a first voltage level.