Invention Grant
- Patent Title: Multi-phase exciting and scanning with zero-sum sequences
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Application No.: US17331389Application Date: 2021-05-26
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Publication No.: US11868561B2Publication Date: 2024-01-09
- Inventor: Volodymyr Bihday , Andriy Maharyta , Igor Kravets , Mykhaylo Krekhovetskyy , Ihor Musijchuk
- Applicant: Cypress Semiconductor Corporation
- Applicant Address: US CA San Jose
- Assignee: Cypress Semiconductor Corporation
- Current Assignee: Cypress Semiconductor Corporation
- Current Assignee Address: US CA San Jose
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G06F3/044

Abstract:
Apparatuses and methods of multi-phase scanning of a touch panel are described. One apparatus selects a sequence having a number of one values, negative one values, and zero values. The one values correspond to an in-phase drive signal, the negative one values correspond to an opposite-phase drive signal, and the zero values correspond to a reference signal (e.g., reference voltage or ground). A sum of the sequence is equal to zero. The apparatus applies one of the in-phase drive signal, the opposite-phase drive signal, or the reference signal to each of a first set of electrodes at a first stage according to the sequence. The apparatus rotates the sequence to obtain a rotated sequence and applies one of the signals according to the rotated sequence. The apparatus receives sense signals to detect a presence of an object on the touch panel.
Public/Granted literature
- US20220382451A1 MULTI-PHASE EXCITING AND SCANNING WITH ZERO-SUM SEQUENCES Public/Granted day:2022-12-01
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