CN102436329B - Infrared touch system based on liquid crystal light valves and optical lenses - Google Patents
Infrared touch system based on liquid crystal light valves and optical lenses Download PDFInfo
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- CN102436329B CN102436329B CN 201110361812 CN201110361812A CN102436329B CN 102436329 B CN102436329 B CN 102436329B CN 201110361812 CN201110361812 CN 201110361812 CN 201110361812 A CN201110361812 A CN 201110361812A CN 102436329 B CN102436329 B CN 102436329B
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- light valve
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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
The present invention relates to the infrared touch panel field, be specially a kind of infrared touch system based on liquid crystal light valve and optical lens.
Background technology
Infrared touch panel is a kind of natural human-computer interaction device, with its naturality and convenience, becomes just gradually a kind of extremely attractive brand-new multimedia interactive equipment.Infrared touch panel has high light transmittance, long service life, is not afraid of the characteristics such as scratch, especially has very high cost performance in the large scale displaying scheme.The method of a plurality of touch points of early stage infrared touch panel identification has two kinds of time-sharing approach and subregion methods.For time-sharing approach, in the situation that always there are two fingers to touch simultaneously and can not judge exactly; And for the subregion method, when touch coordinate is many, just needing more subregion, scanning times also increases accordingly, has a strong impact on the response time of touch-screen, has limited the development of infrared multi-point touch.The patent No. is that the patent of CN200920079315.4 discloses the infrared touch panel that a kind of double-deck infrared diode is crosswise arranged, its double-deck infrared diode structure has increased the thickness of touch-screen, and need the diode number of arrangement too much, cause the scan period long, affect the response time.The patent No. is the multiple point touching structure that the patent of CN201020256135.1 discloses a kind of individual layer infrared diode, and it is only to have added severally to infrared diode in the corner of touch-screen, has touch point identification blind area.
Summary of the invention
The object of the invention is to provide a kind of infrared touch system based on liquid crystal light valve and optical lens, needs Multiple-Scan to solve the prior art infrared touch panel for the multiple point touching point, and has the problem of identification blind area, touch point.
In order to achieve the above object, the technical solution adopted in the present invention is:
a kind of infrared touch system based on liquid crystal light valve and optical lens, comprise touch-screen, it is characterized in that: in touch-screen four edges, limit, two adjacent edges are furnished with respectively a plurality of infrared-emitting diodes, other two adjacent edges are furnished with respectively a plurality of infrared receiving diodes, the infrared-emitting diode of one of them edge of touch-screen is one by one over against the infrared receiving diode of its offside edge, each infrared-emitting diode exiting surface the place ahead is disposed with respectively and the infrared-emitting diode liquid crystal light valve pair of central shaft altogether, optical lens, described liquid crystal light valve is to being connected as one by two words and horizontal liquid crystal light valve in infrared-emitting diode exiting surface the place ahead consists of, two liquid crystal light valve polarity differences of each liquid crystal light valve centering and switch interlock, the liquid crystal light valve position of the liquid crystal light valve Middle Phase same polarity in a plurality of infrared-emitting diode exiting surfaces the place ahead is corresponding respectively, when liquid crystal light valve centering, during the liquid crystal light valve conducting of positive polarity, the liquid crystal light valve cut-off of negative polarity, each infrared-emitting diode emitting laser passes the liquid crystal light valve of each self-corresponding positive polarity, pass again and be incident to stagger over against the same side, the position infrared receiving diode of certain distance of offside after each self-corresponding optical lens, form an infrared light grid that is consisted of by infrared light, when liquid crystal light valve centering, during the liquid crystal light valve conducting of negative polarity, the liquid crystal light valve cut-off of positive polarity, each infrared-emitting diode emitting laser passes the liquid crystal light valve of each self-corresponding negative polarity, pass again be incident to after each self-corresponding optical lens offside over against the position the stagger infrared receiving diode of certain distance of another homonymy, form the infrared light grid that another is made of infrared light.
Described a kind of infrared touch system based on liquid crystal light valve and optical lens, it is characterized in that: described infrared-emitting diode, infrared receiving diode are the infrared diode of gravestone shape.
Described a kind of infrared touch system based on liquid crystal light valve and optical lens is characterized in that: the width of two liquid crystal light valves of liquid crystal light valve centering in each infrared-emitting diode exiting surface the place ahead all less than the infrared-emitting diode width half.
Described a kind of infrared touch system based on liquid crystal light valve and optical lens is characterized in that: optical lens shape is column, and infrared-emitting diode is positioned at the optical lens focal plane position.
Described a kind of infrared touch system based on liquid crystal light valve and optical lens, it is characterized in that: every eight liquid crystal light valves are produced being one group, each liquid crystal light comprises a positive polarity and a liquid crystal light valve negative polarity, liquid crystal light valve links together to group and group, drive when consistent managing 8 one group with commonly used infrared emission, to improve the reusing of liquid crystal light valve.
Described a kind of infrared touch system based on liquid crystal light valve and optical lens, it is characterized in that: each liquid crystal light valve centering, two liquid crystal light valve junctions are positioned on the central shaft of optical lens, infrared-emitting diode, also be positioned on the main shaft of optical lens focal plane, block with the material that absorbs wavelength of transmitted light two liquid crystal light valve junctions.
The present invention can effectively remove pseudo-touch point, and can solve multiple touch points identification needs Multiple-Scan time problem, and has response soon, the advantages such as non-blind area.
Description of drawings
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the schematic diagram of gravestone type infrared diode of the present invention.
Fig. 3 is the profile schematic diagram of optical lens of the present invention.
Fig. 4 is the propagation index path of optical lens in the present invention.
Fig. 5 is the simulation result schematic diagram of optical lens of the present invention in the oblique incidence light situation on the focal plane.
Fig. 6 is the arranged distribution schematic diagram of liquid crystal light valve of the present invention.
Fig. 7 is the optic path figure when in the present invention, the positive polarity liquid crystal light valve is opened.
Fig. 8 is the optic path figure when in the present invention, the negative polarity liquid crystal light valve is opened.
Embodiment
As shown in Fig. 1.Touch-screen of the present invention comprises infrared-emitting diode 11, and infrared receiving diode 13, two liquid crystal light valves are to 12, optical lens 14, opaque materials 15.Wherein touch-screen two neighboring edges are covered with infrared-emitting diode, other two neighboring edges are covered with infrared receiving diode, the infrared receiving diode position of the infrared-emitting diode at an edge of touch-screen and offside one by one over against, infrared-emitting diode, infrared receiving diode form the infrared array of quadrature at touch-screen edge close-packed arrays.Be placed with liquid crystal light valve that the liquid crystal light valve by two opposed polarity switch interlocks consists of in the place ahead of infrared-emitting diode to 12, be used for controlling in the different time conducting and the cut-off of infrared light on the optical lens diverse location.In the right the place ahead of liquid crystal light valve, be fixed with the optical lens that width is complementary with liquid crystal light valve, infrared-emitting diode is on the focal plane of optical lens, so that by the parallel outgoing of the right infrared light of liquid crystal light valve.Opaque materials 15 is placed on liquid crystal light valve right centre, makes infrared light without the main shaft of optical lens, has formed two groups of directional lights with regard to timesharing like this, also namely forms two groups of different infrared grids in the different time.In case there is a touch objects to block, will timesharing stop two groups of different light paths, there is plural infrared reception diode not receive infrared light in the different time.According to the different coordinates that can calculate multiple point touching that blocks.Under the large scale infrared touch panel, the infrared emission that needs is more to managing, and uses the method to reduce sweep time, improves the response speed of multiple point touching.
Liquid crystal light valve is in the situation that without impressed voltage, in liquid crystal light valve, intermembranously can not form regular electric field, and liquid crystal molecule becomes disordered state, and its effective refractive index is not complementary with the refractive index of polymkeric substance, and incident ray is by strong reflection.In the situation that apply external voltage, the optical axis of liquid crystal particle is arranged perpendicular to film surface, and namely the direction with electric field is consistent, and the ordinary refraction index of particulate and the refractive index of polymkeric substance are mated substantially, scattering consisted of basic medium uniformly, so incident light can not occur.Two liquid crystal light valve polarity in each infrared-emitting diode of the present invention the place ahead are different, and in the conducting respectively of different time, the light of controlling diverse location passes through.
As shown in Figure 2.The rear of gravestone type infrared diode is rectangular parallelepiped, and the place ahead is hemispheric flat diode, and its width is 3mm-5mm.
As shown in Figure 3.It is formed optical lens by many structures and the identical little optical lens unit planar linear arrangement of performance, and wherein one side is flat, and another side is the curved surface that periodic undulations changes.Each optical lens unit is not working to light the effect of converging with the perpendicular direction of orientation, and in its orientation, each optical lens unit is equivalent to plus lens, plays the optically focused imaging.
As shown in Fig. 4.Regard a unit light as by the infrared light of liquid crystal light valve, be placed on the focal plane of optical lens, namely as being on the focal plane, can make as any point on the plane all can become parallel beam through the post lens.As shown in the figure, take the O point as the center of circle, for the y=0 point, it becomes the light beam of propagating along optical axis oo ' after the refraction of post mirror.Take optical axis oo ' as the boundary, the downward transmission information of thin parallel beam that forms greater than 0 point for y; The thin parallel beam that the point of y＜0 forms is transmission information upwards, and the width of thin parallel beam is the pitch p of optical lens unit.Wherein to depart from the computing formula of angle δ of optical axis yy as follows for parallel beam, and y is the position from the initial point longitudinal axis, and the r original screen panel is radius-of-curvature, and n is the refractive index of original screen panel:
As shown in Figure 5.This pointolite is positioned at the top of focal plane main shaft, and its output light is the directional light that deflects down certain angle.
As shown in Figure 6.Described a kind of infrared touch system based on liquid crystal light valve and optical lens, it is characterized in that: every eight liquid crystal light valves are produced being one group, each liquid crystal light comprises a positive polarity and a liquid crystal light valve negative polarity, liquid crystal light valve links together to group and group, drive when consistent managing 8 one group with commonly used infrared emission, to improve the reusing of liquid crystal light valve.
As shown in Figure 7.Optic path figure when Fig. 7 is the conducting of positive polarity liquid crystal light valve.Suppose to detect two touch signals, according to the Computing Principle at triangle edges, angle, obtained the coordinate setting point of infrared grid.Due to the touch signals of 2 can make up obtain four some A (m, a), B (n, a), C (m, b), D (n, b);
As shown in Figure 8.Optic path figure when Fig. 8 is the conducting of negative polarity liquid crystal light valve.It formed with Fig. 7 different directions on degree of tilt.When Fig. 7 detected A, B, C, 4 touch coordinates of D, Fig. 8 had stopped the light of different light paths, can obtain A through calculating coordinate, D, E, four points of F, wherein two identical with Fig. 7 coordinate, and two other difference.According to the analysis of two groups of coordinates, can get rid of pseudo-touch point, carry out the multiple point touching response by common touch gestures identification to controlling the interface.
Workflow of the present invention is as follows:
A. drive one by one the infrared emission diode, and give respectively the liquid crystal light valve positive level, make the liquid crystal light valve of positive polarity be in conducting state, infrared light is by the liquid crystal light valve of positive polarity, and the liquid crystal light valve of negative polarity ends.Also namely, one group of liquid crystal light valve conducting of infrared transmitting tube the place ahead same polarity, other one group of cut-off are controlled in timesharing.
During b. according to the liquid crystal light valve conducting of positive polarity, form the infrared grid that intersects on whole touch pad; Occur in case have to touch, infrared ray is blocked, and can obtain one group of touch signal.
C. when the liquid crystal light valve conducting of negative polarity, the cut-off of the liquid crystal light valve of positive polarity, the different infrared grid of direction when having formed from the positive polarity conducting; Obtain other one group of touch signal.
D. obtain two groups of touch coordinates by stating two groups of touch signals through calculating coordinate; If the touch point that two groups of touch signals obtain is all to have and only have one, be so just single-point touches; If detect and to obtain a plurality of touch points, analyze the combination of the touch coordinate of first group and second group, remove pseudo-touch point, draw the point of real touch.
E. by touch point obtained above, according to gesture identification, judge the multiple point touching gesture, realize the gesture response to the user, touch interface is carried out multiple spot control.
Claims (5)
1. infrared touch system based on liquid crystal light valve and optical lens, comprise touch-screen, it is characterized in that: in touch-screen four edges, limit, two adjacent edges are furnished with respectively a plurality of infrared-emitting diodes, other two adjacent edges are furnished with respectively a plurality of infrared receiving diodes, the infrared-emitting diode of one of them edge of touch-screen is one by one over against the infrared receiving diode of its offside edge, each infrared-emitting diode exiting surface the place ahead is disposed with respectively and the infrared-emitting diode liquid crystal light valve pair of central shaft altogether, optical lens, described liquid crystal light valve is to being connected as one by two words and horizontal liquid crystal light valve in infrared-emitting diode exiting surface the place ahead consists of, each liquid crystal light valve centering, two liquid crystal light valve junctions are positioned at optical lens, on the central shaft of infrared-emitting diode, also be positioned on the main shaft of optical lens focal plane, block with the material that absorbs wavelength of transmitted light two liquid crystal light valve junctions, two liquid crystal light valve polarity differences of each liquid crystal light valve centering and switch interlock, the liquid crystal light valve position of the liquid crystal light valve Middle Phase same polarity in a plurality of infrared-emitting diode exiting surfaces the place aheads is corresponding respectively, when liquid crystal light valve centering, during the liquid crystal light valve conducting of positive polarity, the liquid crystal light valve cut-off of negative polarity, each infrared-emitting diode emitting laser passes the liquid crystal light valve of each self-corresponding positive polarity, pass again and be incident to stagger over against the same side, the position infrared receiving diode of certain distance of offside after each self-corresponding optical lens, form an infrared light grid that is consisted of by infrared light, when liquid crystal light valve centering, during the liquid crystal light valve conducting of negative polarity, the liquid crystal light valve cut-off of positive polarity, each infrared-emitting diode emitting laser passes the liquid crystal light valve of each self-corresponding negative polarity, pass again be incident to after each self-corresponding optical lens offside over against the position the stagger infrared receiving diode of certain distance of another homonymy, form the infrared light grid that another is made of infrared light.
2. a kind of infrared touch system based on liquid crystal light valve and optical lens according to claim 1, it is characterized in that: described infrared-emitting diode, infrared receiving diode are the infrared diode of gravestone shape.
3. a kind of infrared touch system based on liquid crystal light valve and optical lens according to claim 1 is characterized in that: the width of two liquid crystal light valves of liquid crystal light valve centering in each infrared-emitting diode exiting surface the place ahead all less than the infrared-emitting diode width half.
4. a kind of infrared touch system based on liquid crystal light valve and optical lens according to claim 1, it is characterized in that: optical lens shape is column, and infrared-emitting diode is positioned at the optical lens focal plane position.
5. a kind of infrared touch system based on liquid crystal light valve and optical lens according to claim 1 is characterized in that: every eight liquid crystal light valves are to being a row, and row and row link together, to improve the reusing of liquid crystal light valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110361812 CN102436329B (en) | 2011-11-16 | 2011-11-16 | Infrared touch system based on liquid crystal light valves and optical lenses |
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| CN 201110361812 CN102436329B (en) | 2011-11-16 | 2011-11-16 | Infrared touch system based on liquid crystal light valves and optical lenses |
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| CN102436329A CN102436329A (en) | 2012-05-02 |
| CN102436329B true CN102436329B (en) | 2013-11-06 |
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| CN106598355A (en) * | 2016-11-23 | 2017-04-26 | 杭州碳诺电子科技有限公司 | Handwriting board device and method capable of identifying a plurality of characteristics of objects |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409810A (en) * | 2003-10-10 | 2009-04-15 | Nec显示器解决方案株式会社 | Projector and projector accessory |
| CN201465074U (en) * | 2009-02-28 | 2010-05-12 | 成都吉锐触摸技术股份有限公司 | Multi-point touch infrared touch screen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093683A (en) * | 2005-09-27 | 2007-04-12 | Sanyo Epson Imaging Devices Corp | Liquid crystal device and electronic apparatus |
| CN101465074A (en) * | 2008-10-21 | 2009-06-24 | 华南理工大学 | Method for evaluating hand-written Hanzi layout |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409810A (en) * | 2003-10-10 | 2009-04-15 | Nec显示器解决方案株式会社 | Projector and projector accessory |
| CN201465074U (en) * | 2009-02-28 | 2010-05-12 | 成都吉锐触摸技术股份有限公司 | Multi-point touch infrared touch screen |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2007-93683A 2007.04.12 |
| 李海峰.液晶光阀及其在大屏幕投影显示中的应用.《中国优秀博硕士学位论文全文数据库 (博士)信息科技辑》.2003,(第1期),I136-2. |
| 液晶光阀及其在大屏幕投影显示中的应用;李海峰;《中国优秀博硕士学位论文全文数据库 (博士)信息科技辑》;20030315(第1期);I136-2 * |
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