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Touch position finding method and apparatus

A technology of touch position and touch screen, applied in the field of touch position

Inactive Publication Date: 2011-09-21
ATMEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So while such processing power is being considered extremely small in the context of a microprocessor or digital signal processor, it is not insignificant for microcontrollers or other low-spec items with memory and numerical processing constraints

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  • Touch position finding method and apparatus
  • Touch position finding method and apparatus
  • Touch position finding method and apparatus

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Embodiment Construction

[0051] The method of the present invention is applied to data sets output from a touch screen. A 2D touch screen will be used in the detailed description below. However, it should be noted that the method described is applicable to ID touch sensors and in principle also to 3D sensor technology, although the latter is not yet well developed. It is assumed that a 2D touch screen consists of a square grid of sensing nodes characterized by the same inter-node spacing along two orthogonal axes, which will hereinafter be referred to as x and y. However, it should be understood that other node arrangements are possible, for example a rectangular grid could be used. Furthermore, other regular grid patterns or arbitrary node distributions may be provided, which may be more or less feasible depending on the type of touch screen being considered (ie capacitive, resistive, acoustic, etc.). For example, a triangular grid may be provided.

[0052] When sampling, it is assumed that the to...

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PUM

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Abstract

In a touch sensor comprising a plurality of sensing nodes, the touch location in each dimension is obtained from the node at which the sum of the signal values assigned to the touch on either side of said node are equal or approximately equal. Each of the sensing nodes is replaced by a plurality of notional sensing nodes distributed around its respective sensing node over a distance corresponding to an internode spacing. Signal values 2, 6, 11, 5 and 2 have been obtained for the distribution of signal across the touch sensor. These signals are notionally split in equal spacings in the range covered by each node, each notional signal being shown with vertical tally sticks. The touch coordinate is then determined by finding the position of the median tally stick. Since there are 26 notional signals, each with a signal value of 1, the position of the median signal is between the 13th and 14th notional signals, as indicated by the thick arrow. This is a numerically simple method for obtaining touch coordinates at higher resolution than the resolution of the nodes ideally suited for implementation on a microcontroller.

Description

[0001] Related Application Cross Reference [0002] Priority is claimed herein to US Patent Application Serial No. 12 / 255,616, filed October 21, 2008, which is hereby incorporated by reference. technical field [0003] The present invention relates to a method and apparatus for calculating the position of a touch on a touch sensor. Background technique [0004] Two-dimensional (2D) touch screens, regardless of the technology used, typically have a construction based on a matrix of sensor nodes whose Cartesian coordinates form a 2D array, ie, a grid. [0005] In capacitive sensors, for example, each node is checked at each sampling interval for a signal change at that node or indeed a signal change from a predetermined background level. These signals are then compared with a predetermined threshold and those above the threshold are considered to have been touched and this is used as the basis for further numerical processing. [0006] In the simplest case of this touch scr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/044
CPCG06F3/0416G06F3/04166
Inventor 马丁·西蒙斯丹尼尔·皮克特
Owner ATMEL CORP