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Compensated linear interpolation of capacitive sensors of capacitive touch screens

A technology of capacitive touch screen and touch screen, which is applied in the direction of instruments, electrical digital data processing, input/output process of data processing, etc., and can solve problems such as errors

Active Publication Date: 2013-09-11
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, when one boundary is accurate, an error occurs on the opposite boundary

Method used

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  • Compensated linear interpolation of capacitive sensors of capacitive touch screens
  • Compensated linear interpolation of capacitive sensors of capacitive touch screens
  • Compensated linear interpolation of capacitive sensors of capacitive touch screens

Examples

Experimental program
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Embodiment Construction

[0028] Go to Figure 3A , Introduces an aspect of the system 200 that uses the “compensated linear” interpolation algorithm to determine the touch on the capacitive screen constructed according to the principles of this application.

[0029] The system includes a capacitive touch screen (CTS) 210. On the one hand, although the CTS may be manufactured according to other methods, the CTS 210 includes a plurality of horizontal bars 215 and vertical bars 219. The CTS also includes example nodes 211,212,213.

[0030] A touch screen interpolator (TSI) 220 is coupled to the CTS210. The TSI220 uses a "compensated linear" interpolation algorithm to determine where the contacts on the CTS210 appear. The interpolator 220 is configured as follows: insert a value based on data points related to at least three nodes, where the data points are: a) the capacitance amplitude change of the node with the largest amplitude change; b) the position of the largest amplitude change of the node; c) The ...

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Abstract

An apparatus includes a capacitive touch screen (CTS); a touch screen interpolator (TSI) coupled to the CTS; a touch screen capacitive memory (TSCM) coupled to the touch screen interpolator, wherein the interpolator is configured to: interpolates a value based on data points correlated to at least three nodes: a magnitude change of capacitance of a node having the largest magnitude change; a position of the largest magnitude of change node; a change of magnitude of capacitance of a first closest neighbor node; and a change of magnitude of capacitance of a second closest neighbor node.

Description

[0001] priority [0002] This application claims priority to the U.S. provisional application filed on February 24, 2012, with the application number 61 / 602,693 and the title of the invention "COMPENSATED LINEAR INTERPOLATION FOR CAPACITIVE SENSORS", the entire content of which is incorporated by reference Incorporated into this article. Technical field [0003] This application relates generally to capacitive touch screens, and more specifically to compensation linear interpolation of capacitive sensors of capacitive touch screens. Background technique [0004] figure 1 The capacitive touch screen in the prior art is shown. As shown in the figure, the capacitive touch screen has a horizontal axis and a vertical axis. The horizontal axis and the vertical axis cross the node 105. At this node, the change of the capacitance measurement value of the touch screen capacitance sensor is measured. [0005] However, in the prior art, when trying to interpolate the touch position between t...

Claims

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Application Information

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IPC IPC(8): G06F3/044
CPCG06F3/04186G06F3/0446G06F3/044
Inventor R·F·小科米尔M·D·斯内德克
Owner TEXAS INSTR INC
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