Invention Grant
- Patent Title: Techniques to determine X-position in gradient sensors
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Application No.: US14320285Application Date: 2014-06-30
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Publication No.: US09778798B2Publication Date: 2017-10-03
- Inventor: David Hoch
- Applicant: Synaptics Incorporated
- Applicant Address: US CA San Jose
- Assignee: SYNAPTICS INCORPORATED
- Current Assignee: SYNAPTICS INCORPORATED
- Current Assignee Address: US CA San Jose
- Agency: Patterson + Sheridan, LLP
- Main IPC: G06F3/044
- IPC: G06F3/044 ; G01D5/24 ; G06F3/041

Abstract:
Embodiments of the invention generate a voltage gradient across a sensor electrode by driving a negative and positive voltage on respective ends of the electrode to identify a location of an input object. Because both negative and positive voltages are used, one location on the sensor electrode will be at a reference voltage (e.g., system ground). This location is used to divide the sensor electrode into two different regions. Based on measuring a change in charge relative to a baseline, the input device identifies in which of the two regions the input object is located. The input device can then generate a new voltage gradient to shift the location of the reference voltage into the identified region thereby dividing the region into two sub-regions. By iteratively repeating this process using progressively small sub-regions, the input device can identify the location of the input object.
Public/Granted literature
- US20150378468A1 TECHNIQUES TO DETERMINE X-POSITION IN GRADIENT SENSORS Public/Granted day:2015-12-31
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