US 12,321,513 B2
Body-part tracking device and body-part tracking method
Chi Sheng Tseng, Kaohsiung (TW); Lu-Ming Lai, Kaohsiung (TW); Hui-Chung Liu, Kaohsiung (TW); I Hung Wu, Kaohsiung (TW); and Kai-Sheng Pai, Kaohsiung (TW)
Assigned to ADVANCED SEMICONDUCTOR ENGINEERING, INC., Kaohsiung (TW)
Filed by Advanced Semiconductor Engineering, Inc., Kaohsiung (TW)
Filed on Jun. 18, 2021, as Appl. No. 17/352,125.
Prior Publication US 2022/0404908 A1, Dec. 22, 2022
Int. Cl. G06F 3/01 (2006.01); G01S 13/75 (2006.01); G06K 19/077 (2006.01); H01Q 1/27 (2006.01)
CPC G06F 3/013 (2013.01) [G01S 13/75 (2013.01); G06K 19/07773 (2013.01); H01Q 1/273 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A body-part tracking device, comprising:
a first electronic component configured to receive a first radio-frequency wave;
a first antenna element electrically connected to the first electronic component, and
a second antenna element electrically connected to the first electronic component,
wherein the first electronic component is configured to, in response to the first radio-frequency wave, transmit a second radio-frequency wave through the first antenna element,
wherein the first electronic component is configured to, in response to the first radio-frequency wave, transmit a third radio-frequency wave through the second antenna element,
wherein the second radio-frequency wave has a first frequency, and the third radio-frequency wave has a second frequency different from the first frequency,
wherein a viewing focus or position of a wearer's pupil is calculated by determining differences in amplitude, phase, and or frequency between the first radio-frequency wave and the second radio-frequency.