US 12,346,507 B2
Stylus control circuit and stylus
Hao-Wei Cheng, Tainan (TW); and Chin-Lin Lee, Hsinchu (TW)
Assigned to NOVATEK Microelectronics Corp., Hsin-Chu (TW)
Filed by NOVATEK Microelectronics Corp., Hsin-Chu (TW)
Filed on Jan. 18, 2023, as Appl. No. 18/098,122.
Claims priority of provisional application 63/303,510, filed on Jan. 27, 2022.
Prior Publication US 2023/0236677 A1, Jul. 27, 2023
Int. Cl. G06F 3/0354 (2013.01)
CPC G06F 3/03545 (2013.01) 8 Claims
OG exemplary drawing
 
1. A stylus control circuit to control a stylus, the stylus control circuit comprising:
a positioning signal generator to generate a first positioning signal having a first frequency and transmit the first positioning signal to the stylus through a first positioning transmission electrode in a second stylus transmission period which is after a first stylus transmission period for transmitting an uplink command signal;
an uplink control circuit, configured to transmit the uplink command signal during the first stylus transmission period; and
a plurality of multiplexers, each coupled to the positioning signal generator and the first positioning transmission electrode, to control the stylus control circuit to selectively output the first positioning signal, the uplink command signal, or a touch driving signal;
wherein the first frequency corresponds to a position of the first positioning transmission electrode;
wherein the first positioning signal is a frequency signal without carrying any digital data;
wherein the stylus control circuit is used to receive a position information of the stylus from the stylus through a wireless communication interface or through at least one of a plurality of touch sensing electrodes, wherein the position information is generated in response to the first positioning signal.