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Infrared touch system based on liquid crystal light valves and optical lenses

A liquid crystal light valve and optical lens technology, applied in the input/output process of data processing, instruments, electrical digital data processing and other directions, can solve problems such as touch point recognition blind spots, and achieve the effect of fast response

Inactive Publication Date: 2012-05-02
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an infrared touch system based on a liquid crystal light valve and an optical lens 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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  • Infrared touch system based on liquid crystal light valves and optical lenses
  • Infrared touch system based on liquid crystal light valves and optical lenses
  • Infrared touch system based on liquid crystal light valves and optical lenses

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Embodiment Construction

[0020] Such as figure 1 shown. The touch screen of the present invention includes an infrared emitting diode 11, an infrared receiving diode 13, two pairs of liquid crystal light valves 12, an optical lens 14, and an opaque object 15. The two adjacent edges of the touch screen are covered with infrared emitting diodes, and the other two adjacent edges are covered with infrared receiving diodes. The infrared emitting diodes on one edge of the touch screen are directly opposite to the infrared receiving diodes on the opposite side. Closely arranged on the edge of the touch screen to form an orthogonal infrared array. A pair of liquid crystal light valves 12 consisting of two interlocked liquid crystal light valves with different polarity switches is placed in front of the infrared emitting diode to control the conduction and cutoff of infrared light at different positions of the optical lens at different times. In front of the pair of liquid crystal light valves, an optical l...

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Abstract

The invention discloses an infrared touch system based on liquid crystal light valves and optical lenses, which comprises a touch screen, wherein a plurality of infrared emission diodes are respectively arranged at positions of two adjacent edges of four edges of the touch screen, and a plurality of infrared reception diodes are respectively arranged at positions of the other two adjacent edges. A liquid crystal light valve pair and the optical lens are respectively and sequentially arranged in front of the light-emitting face of each infrared emission diode, and the liquid crystal light valve pair is composed of two liquid crystal light valves with different polarities and switches to be interlocked. The infrared touch system based on the liquid crystal light valves and the optical lenses can effectively remove false touch points, can solve the problem that multi-touch-point distinguishing needs multi-time scanning, and has the advantages of being fast in response, free of blind areas and the like.

Description

technical field [0001] The invention relates to the field of infrared touch screens, in particular to an infrared touch system based on liquid crystal light valves and optical lenses. 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 increase...

Claims

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Application Information

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