发明名称 |
SYSTEMS AND METHODS FOR RESOLVING MULTITOUCH SCENARIOS FOR OPTICAL TOUCHSCREENS |
摘要 |
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. |
申请公布号 |
WO2009102681(A3) |
申请公布日期 |
2010.05.14 |
申请号 |
WO2009US33624 |
申请日期 |
2009.02.10 |
申请人 |
NEXT HOLDINGS, INC.;NEWTON, JOHN, DAVID |
发明人 |
NEWTON, JOHN, DAVID |
分类号 |
G06F3/042 |
主分类号 |
G06F3/042 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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