US 12,147,640 B2
Electromagnetic touch screen and electromagnetic touch device
Chuan Shuai, Wuhan (CN); Rui He, Wuhan (CN); and Guowei Zha, Wuhan (CN)
Assigned to WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Wuhan (CN)
Filed by WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Wuhan (CN)
Filed on Dec. 15, 2022, as Appl. No. 18/082,010.
Claims priority of application No. 202211262673.5 (CN), filed on Oct. 14, 2022.
Prior Publication US 2024/0126398 A1, Apr. 18, 2024
Int. Cl. G06F 3/046 (2006.01); G06F 3/0354 (2013.01); G06F 3/041 (2006.01)
CPC G06F 3/046 (2013.01) [G06F 3/03545 (2013.01); G06F 3/0412 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electromagnetic touch screen, coupled with a stylus, and comprising:
a base;
transmitting coils arranged on the base; and
receiving coils arranged on the base;
wherein all of the transmitting coils are correspondingly arranged in a peripheral area around the receiving coils, the transmitting coils are configured to transmit transmitting signals through which a first magnetic field is generated to charge the stylus before a touch operation, and the receiving coils are configured to generate receiving signals during the touch operation.