US 12,443,292 B2
Input detection apparatus and related input device
Xiaoke Hou, Dongguan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Feb. 26, 2024, as Appl. No. 18/587,774.
Application 18/587,774 is a continuation of application No. PCT/CN2022/115505, filed on Aug. 29, 2022.
Claims priority of application No. 202111015195.3 (CN), filed on Aug. 31, 2021.
Prior Publication US 2024/0281075 A1, Aug. 22, 2024
Int. Cl. G06F 3/0354 (2013.01); G06F 3/03 (2006.01); G06F 3/0346 (2013.01); G06F 3/038 (2013.01); G06F 3/041 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 3/0304 (2013.01); G06F 3/0346 (2013.01); G06F 3/0383 (2013.01); G06F 3/04162 (2019.05)] 20 Claims
OG exemplary drawing
 
1. An input detection apparatus, comprising:
a plurality of lasers; and
a processor, the lasers comprising at least two first lasers disposed in a first axial direction and at least two second lasers disposed in a second axial direction, the first axial direction being perpendicular to the second axial direction, each of the first lasers and each of the second lasers being coupled to the processor;
the laser being configured to emit laser light and to generate a self-mixing interference signal when the laser light is reflected into a resonant cavity of the laser through a reference plane, wherein the processor is configured to:
determine a first displacement of the input detection apparatus in the reference plane based on self-mixing interference signals generated by all the first lasers and relative position information between the at least two first lasers, and determine a second displacement of the input detection apparatus in the reference plane based on self-mixing interference signals generated by all the second lasers and relative position information between the at least two second lasers; and
determine a movement path of the input detection apparatus in the reference plane based on the first displacement and the second displacement of the input detection apparatus in the reference plane.