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Infrared multi-touch system

A multi-touch and infrared technology, which is applied in the direction of instruments, electrical digital data processing, and data processing input/output process, can solve the problems of touch point identification blind spots, etc., and achieve the effect of fast response

Inactive Publication Date: 2014-01-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an infrared multi-touch system to solve the problem that the infrared touch screen in the prior art requires multiple scans for multi-touch points and there is a blind area for touch point recognition

Method used

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Embodiment Construction

[0020] Such as figure 1 shown. The present invention includes infrared emitting diodes 11 arranged on two adjacent edges of the touch screen, and infrared receiving diodes 13 arranged on the other two adjacent edges of the touch screen. Each infrared emitting diode is provided with two interlocking polarity switches in front of the light emitting surface. A pair of liquid crystal light valves composed of liquid crystal light valves. The pair of liquid crystal light valves is composed of two liquid crystal light valves 12 arranged in a straight line and placed horizontally in front of the light emitting surface of the infrared emitting diode. Multiple liquid crystal light valves are centered, and the same polarity is selected. Optical lenses 14 are respectively arranged in front of one of the liquid crystal light valves. The infrared emitting diodes and the infrared receiving diodes are closely arranged on the touch screen to form an orthogonal infrared grid. Two liquid crys...

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Abstract

The invention discloses an infrared multi-touch system, comprising a touch screen, wherein two adjacent edges in the four edges of the touch screen are respectively provided with multiple infrared emission diodes, while the other two adjacent edges are respectively provided with multiple infrared receiving diodes, a liquid crystal light valve pair is arranged in front of the light emitting surface of each infrared emission diode and comprises two liquid crystal light valves which have different polarities and are in switch interlocking, and in the multiple liquid crystal light valve pairs, optical lenses are arranged in front of the liquid crystal light valves having the same polarity. The infrared multi-touch system disclosed by the invention can be used for effectively eliminating false touch points and solving the problems of repeated scanning in multi-touch point identification, and has the advantages of high response speed, no blind region and the like.

Description

technical field [0001] The invention relates to the field of infrared touch screens, in particular to an infrared multi-touch system. Background technique [0002] Infrared touch screen is a natural human-computer interaction device. With its naturalness and convenience, it is gradually becoming a very attractive new multimedia interactive device. The infrared touch screen has the characteristics of high light transmittance, long service life, and is not afraid of scratches, especially in large-size display solutions with high cost performance. There are two methods for early infrared touch screens to identify multiple touch points: time-sharing method and partition method. For the time-sharing method, it cannot be judged accurately when there are always two fingers touching at the same time; for the partition method, when there are many touch coordinates, more partitions are needed, and the number of scans also increases accordingly, which seriously affects the touch s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G02F1/133
Inventor 胡跃辉吴娟吕国强尹静
Owner HEFEI UNIV OF TECH