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: 2013-11-06
HEFEI UNIV OF TECH
View PDF2 Cites 0 Cited by
- 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 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 liquid crystal light valve pairs 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 diode on one edge of the touch screen is directly opposite to the infrared receiving diode on the opposite side. Infrared emitting diode and infrared receiving diode Closely arranged on the edge of the touch screen, forming an orthogonal infrared array. A liquid crystal light valve pair 12 composed of two liquid crystal light valves with different polarity switches interlocked is placed in front of the infrared emitting diode to control the conduction and cut-off of the infrared light at different positions of the optical lens at different times. In front of the liqui...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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 a liquid crystal light valve and an optical lens. Background technique [0002] Infrared touch screen is a natural human-computer interaction device. With its naturalness and convenience, it is gradually becoming an extremely attractive new multimedia interactive device. The infrared touch screen has the characteristics of high light transmission, long service life, and scratch resistance, especially in the large-size display scheme, which has a high cost performance. Early infrared touch screens used two methods to identify multiple touch points: time-sharing and partitioning. For the time-sharing method, it cannot be accurately judged when there are always two fingers touching at the same time; for the partition method, when there are more touch coordinates, more partitions are needed, and the number of scans increases accordingly, which s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
Inventor 胡跃辉吴娟吕国强尹静
Owner HEFEI UNIV OF TECH