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Systems and methods for resolving multitouch scenarios for optical touchscreens

A touch point, touch area technology, applied in the input/output process of data processing, instruments, electrical digital data processing and other directions, can solve problems such as indistinguishability

Inactive Publication Date: 2011-02-09
NEXT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there are only two photodetectors, these "false points" are indistinguishable from "real" touch points where light from the touch area is actually blocked

Method used

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  • Systems and methods for resolving multitouch scenarios for optical touchscreens
  • Systems and methods for resolving multitouch scenarios for optical touchscreens
  • Systems and methods for resolving multitouch scenarios for optical touchscreens

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Embodiment Construction

[0026] Reference will now be made in detail to a number of alternative exemplary embodiments and figures. Each example is provided by way of illustration, not limitation. It will be apparent to those skilled in the art that modifications and changes can be made without departing from the scope or spirit of the disclosure and claims. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield a still further embodiment. Accordingly, it is intended that the subsequent disclosure include such modifications and changes as come within the scope of the claims and equivalency of the claims.

[0027] Figure 5 is a block diagram illustrating an example touch detection system 200 configured in accordance with one or more aspects of the present subject matter. In this embodiment, two optical units 202A and 202B are disposed at the corners of a touch area 204 bounded on three sides by a retroreflective bezel 206 having portions 2...

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Abstract

An optical touch detection system may rely on triangulating points in a touch area based on the direction of shadows cast by an object interrupting light in the touch area. When two interruptions occur simultaneously, ghost points and true touch points triangulated from the shadows can be distinguished from one another without resort to additional light detectors. In some embodiments, a distance from a touch point to a single light detector can be determined or estimated based on a change in the length of a shadow detected by a light detector when multiple light sources are used. Based on the distance, the true touch points can be identified by comparing the distance as determined from shadow extension to a distance calculated from the triangulated location of the touch points.

Description

[0001] priority claim [0002] This application claims priority to New Zealand Provisional Patent Application No. 565,808, entitled "OPTICALTOUCHSCREEN RESOLVING MULTITOUCH," filed February 14, 2008, which is incorporated herein by reference. technical field [0003] The subject matter relates to touch display systems that allow a user to interact with one or more processing devices by touching on or near a surface. Background technique [0004] figure 1 An example is shown of an optical / infrared based touch detection system 100 that relies on the detection of light propagating in an optical path located in one or more of areas 104 (hereinafter "touch areas") on a touch surface. in multiple detection planes. figure 2 A perspective view of a portion of system 100 is depicted. For example, optical imaging for touch screens can use a combination of line scan or area imaging cameras, digital signal processing, front or back lighting, and algorithms to determine the point or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
CPCG06F3/0421G06F3/0416G06F2203/04104G06F2203/04111
Inventor 约翰·大卫·牛顿
Owner NEXT HLDG