CN103268172A - Optical imaging touch screen and method for reinforcing effective signal of optical imaging touch screen - Google Patents
Optical imaging touch screen and method for reinforcing effective signal of optical imaging touch screen Download PDFInfo
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- CN103268172A CN103268172A CN2013101968621A CN201310196862A CN103268172A CN 103268172 A CN103268172 A CN 103268172A CN 2013101968621 A CN2013101968621 A CN 2013101968621A CN 201310196862 A CN201310196862 A CN 201310196862A CN 103268172 A CN103268172 A CN 103268172A
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- edge strip
- bright wisp
- touch
- touch screen
- optical imagery
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Abstract
The invention provides an optical imaging touch screen and a method for reinforcing an effective signal of the optical imaging touch screen. The optical imaging touch screen comprises a touch screen body, cameras and a plurality of sidebands, wherein the cameras are arranged on two corners of one edge of the touch screen body, the sidebands are arranged on other edges of the touch screen body, and the surface of a back plate of the touch screen body is smooth. According to the optical imaging touch screen, the surface of the touch screen back plate is smooth, so that mirror reflection is formed, therefore, the cameras not only can shoot real images of the sidebands, but also can shoot virtual images, formed by the mirror reflection, of the sidebands, the widths of bright strips shot by the cameras are greatly increased, and the greater the widths of the bright strips are, the larger the range of an effective image is and the stronger the obtained effective signal is.
Description
Technical field
The present invention relates to the optical image technology field, particularly relate to optical imagery touch-screen and useful signal thereof and add strong method.
Background technology
We know that the optical principle that existing optical imagery touch-screen generally utilizes is as follows: be installed in the CCD/CMOS camera in the upper left corner, top, launch light by the LED lamp, through reflection bar reflection all around, enter in the CCD/CMOS camera in the upper left corner.In like manner, the light of the LED in upper right corner emission imports in the CCD camera on right side.The light that gathers forms a reticule in the touch area, through the space between the light that repeatedly reflects in 1MM.When touch is a bit, left side LED is transmitted into the light of this point and light that reflectance coating reflects back all is blocked, LED simultaneously is transmitted into the light of changing the time and also is blocked, the straight line that constitutes between the CCD/CMOS camera at two ends and this two light and two cameras can be formed two angles again like this, this accurate coordinate is realized touching reaction by the controller typing like this.Single-point, multiple point touching have been realized.
Existing optical imagery touch-screen is when reality is used, and camera can photograph the image of adularescent bright wisp, and white bright wisp zone is the zone at reflector layer place, i.e. effective touch area.When touching object and enter, as above scheme the position that red square frame circle is lived, the breakpoint that white bright wisp occurs, that is exactly the effect that object blocks that is touched.The bright wisp width is more big, and then effectively image range is more big, and the useful signal that obtains is just more strong.In the practical application of existing optical imagery touch-screen, the width of bright wisp depends on the developed width of reflector layer, and the bright wisp width is more big, and then effectively image range is more big, and the useful signal that obtains is just more strong.
Be the width that increases edge strip in order to obtain the common way of stronger useful signal, and the width that increases edge strip will certainly increase the production cost of optical imagery touch-screen.
Summary of the invention
Based on this, being necessary to adopt at general optical imagery touch-screen increases the edge strip width and increases the problem that valid signal strengths can increase optical imagery touch-screen production cost, and the optical imagery touch-screen and the useful signal thereof that a kind of simple in structure, low production cost are provided and can effectively increase valid signal strengths add strong method.
A kind of optical imagery touch-screen, comprise touch screen body, camera and a plurality of edge strip, described camera is arranged on two jiaos on one side of described touch screen body, and described edge strip is arranged on other limit of described touch screen body, and the back plate surface of described touch screen body is smooth surface.
Among embodiment, described edge strip is pasted with the reflective edge strip of reflector layer for the surface therein.
Among embodiment, described edge strip is provided with the luminous edge strip of light emitting source for the surface therein.
Among embodiment, described touch screen body and described backboard are rectangle therein, and the quantity of described edge strip is three, and the height of the outstanding described touch screen body of described edge strip is 10 millimeters.
Among embodiment, described camera is infrared camera therein.
A kind of optical imagery touch-screen useful signal adds strong method, on two jiaos on one side of described touch screen body camera is set respectively, on other edge strip of described touch screen body edge strip is set, and the back plate surface of described touch screen body is smooth surface;
Described optical imagery touch-screen useful signal adds strong method and comprises step:
Take by described camera and to obtain the bright wisp virtual image that bright wisp real image that described edge strip forms and described edge strip form in the back plate surface of described touch screen body;
Obtain the useful signal of optical imagery touch-screen according to described bright wisp real image and the described bright wisp virtual image.
Therein among embodiment, described step is taken by described camera and is obtained bright wisp real image that described edge strip forms and described edge strip and specifically comprise in the bright wisp virtual image that the back plate surface of described touch screen body forms:
Take the bright wisp image that obtains described edge strip by described camera;
The direction that defines the back plate surface of the outstanding described touch screen body of described edge strip is last, the first half in the described bright wisp image is identified as the bright wisp real image that described edge strip forms, and described bright wisp image lower middle portion is identified as described edge strip and forms the bright wisp virtual image in the back plate surface of described touch screen body.
Therein among embodiment, the useful signal that described step is obtained the optical imagery touch-screen according to described bright wisp real image and the described bright wisp virtual image specifically comprises:
Calculate the weighted mean value of the gray-scale value of described bright wisp real image respectively, and the weighted mean value of the gray-scale value of the described bright wisp virtual image;
According to the weighted mean value of the gray-scale value of described bright wisp real image, and the weighted mean value of the gray-scale value of the described bright wisp virtual image is drawn energy waveform figure;
Obtain the useful signal of described optical imagery touch-screen by the described energy waveform figure that draws.
Among embodiment, described edge strip is pasted with the reflective edge strip of reflector layer for the surface therein.
Among embodiment, described edge strip is provided with the luminous edge strip of light emitting source for the surface therein.
Optical imagery touch-screen of the present invention, the smooth surface of touch-screen backboard can form the minute surface reflection, camera not only can photograph the bright wisp real image on edge strip but also can also photograph because the virtual image of the bright wisp that minute surface reflects to form like this, so the bright wisp width that camera is taken has just increased greatly, the bright wisp width is more big, then effectively image range is more big, and the useful signal that obtains is just more strong.So optical imagery touch-screen of the present invention is a kind of simple in structure, low production cost and the optical imagery touch-screen that can effectively increase valid signal strengths.
Description of drawings
Fig. 1 is the structural representation of first embodiment of optical imagery touch-screen of the present invention;
Fig. 2 is the structural representation of second embodiment of optical imagery touch-screen of the present invention;
Fig. 3 adds the schematic flow sheet of first embodiment of strong method for optical imagery touch-screen useful signal of the present invention;
Fig. 4 adds the schematic flow sheet of second embodiment of strong method for optical imagery touch-screen useful signal of the present invention.
Embodiment
As shown in Figure 1, a kind of optical imagery touch-screen, comprise touch screen body 100, camera 200 and a plurality of edge strip 300, described camera 200 is arranged on two jiaos on one side of described touch screen body 100, described edge strip 300 is arranged on other limit of described touch screen body 100, and the back plate surface of described touch screen body 100 is smooth surface.
In the present embodiment, the back plate surface of touch screen body is smooth, and what can be similar to regards a smooth minute surface as, and backboard just can reduce the scattering of light like this, thereby can form the minute surface reflection on the surface of backboard, edge strip is arranged on other several the limits of touch screen body.Edge strip is that outstanding touch screen body arranges, and for the ease of explaining and explanation, the height of the outstanding described touch screen body of edge strip is defined as the width of edge strip here.Shelter enters described optical imagery touch-screen, block the light that enters camera, camera can photograph the bright wisp real image that dark-coloured breakpoint is arranged that forms at edge strip, simultaneously because the surface of backboard is smooth, the reflection of formation minute surface, camera can capture the virtual image that appears at the bright wisp of dark-coloured breakpoint in the backboard equally, so the camera bright wisp width that can photograph increases greatly in the present embodiment, in order to obtain optimum effect, edge strip can be vertically set on the edge strip of described touch screen body, is conducive to accurately complete photographing in the bright wisp real image of edge strip formation and the bright wisp virtual image that forms at smooth backboard of camera.
Optical imagery touch-screen of the present invention, the smooth surface of touch-screen backboard can form the minute surface reflection, camera not only can photograph the bright wisp real image on edge strip but also can also photograph because the virtual image of the bright wisp that minute surface reflects to form like this, so the bright wisp width that camera is taken has just increased greatly, the bright wisp width is more big, then effectively image range is more big, and the useful signal that obtains is just more strong.So optical imagery touch-screen of the present invention is a kind of simple in structure, low production cost and the optical imagery touch-screen that can effectively increase valid signal strengths.
In addition, the optical imagery touch-screen needs the useful signal of certain intensity just can guarantee its operate as normal, so the width of edge strip all can have a minimum value in the optical imagery touch-screen.Camera can photograph real image and the virtual image of bright wisp in the optical imagery touch-screen of the present invention, has increased the bright wisp width that camera photographs greatly, so the minimum value of the required edge strip width of optical imagery touch-screen of the present invention will reduce greatly.
Among embodiment, described edge strip is pasted with the reflective edge strip of reflector layer for the surface therein.
Be pasted with reflector layer on the edge strip, the direct light of reflected illumination on edge strip, and other light emitting sources need not be set in addition, be easy to realize.
Among embodiment, described edge strip is provided with the luminous edge strip of light emitting source for the surface therein.
Edge strip is provided with light emitting source can need not arrange other reverse light-sources in video camera one side again from main light emission, has simplified the structure of optical imagery touch-screen of the present invention.
As shown in Figure 2, among embodiment, described touch screen body 100 and described backboard are rectangle therein, and the quantity of described edge strip 300 is three, and the height of described edge strip 300 outstanding described touch screen body 100 is 10 millimeters.
In the present embodiment, touch screen body is designed to rectangle, touch screen body comprises the four edges frame, be respectively first frame 110, second frame 120, the 3rd frame 130, the 4th frame 140, edge strip has three, be respectively that first edge strip 310, second edge strip 320, the 3rd edge strip 330, the first edge strips 310 are arranged on first frame 110, second edge strip 320 is arranged on second frame 120, the 3rd edge strip 330 is arranged on that camera 200 is arranged on the 4th frame 140 of touch screen body on the 3rd frame 330.Because existing touch-screen majority is rectangle, is provided with the popularization that is beneficial to optical imagery touch-screen of the present invention like this.The height of the outstanding touch screen body of edge strip is 10 millimeters, i.e. the bright wisp real image width of edge strip formation also is 10 millimeters.The height setting that edge strip is 10 millimeters is the value of taking into account optical imagery touch-screen groundwork performance and production cost acquisition, and this can also be changed according to the demand of optical imagery touch-screen practical application certainly, for example 6 millimeters, 8 millimeters or 12 millimeters.
Among embodiment, described camera is infrared camera therein.
Infrared camera is a kind of very common camera, it has characteristics such as high-level efficiency, low-power consumption, long-life, choose infrared camera in the present embodiment and can effectively promote overall performance and the serviceable life of optical imagery touch-screen of the present invention as the camera of optical imagery touch-screen of the present invention, in addition since the infrared camera technology maturation so also to a certain degree reduced production cost and the maintenance difficulties of optical imagery touch-screen of the present invention.
As shown in Figure 3, a kind of reinforcement optical imagery touch-screen useful signal adds strong method, on two jiaos on one side of described touch screen body camera is set respectively, on other edge strip of described touch screen body edge strip is set, the back plate surface of described touch screen body is smooth surface;
Described optical imagery touch-screen useful signal adds strong method and comprises step:
S400: take by described camera and to obtain the bright wisp virtual image that bright wisp real image that described edge strip forms and described edge strip form in the back plate surface of described touch screen body;
S500: the useful signal that obtains the optical imagery touch-screen according to described bright wisp real image and the described bright wisp virtual image.
Optical imagery touch-screen useful signal of the present invention adds strong method, on two jiaos on one side of touch screen body camera is set respectively, on other edge strip of touch screen body edge strip is set, edge strip is pasted with the edge strip of reflector layer for the surface, the back plate surface of touch screen body is that smooth surface can enough form the minute surface reflection, camera photograph on edge strip the bright wisp real image and because the virtual image of the bright wisp that reflects to form of minute surface, integrate bright wisp real image and the bright wisp virtual image, obtain broadening bright wisp image, obtain the optical imagery touch-screen useful signal of strengthening according to the bright wisp image after the integration broadening.
As shown in Figure 4, among embodiment, described step S400 specifically comprises therein:
S420: take the bright wisp image that obtains described edge strip by described camera;
S440: the direction that defines the back plate surface of the outstanding described touch screen body of described edge strip is last, the first half in the described bright wisp image is identified as the bright wisp real image that described edge strip forms, and described bright wisp image lower middle portion is identified as described edge strip and forms the bright wisp virtual image in the back plate surface of described touch screen body.
For the ease of explaining, the direction that defines the back plate surface of the outstanding touch screen body of edge strip here is last.Wherein, the first half in the bright wisp image is identified as the bright wisp real image that edge strip forms, the latter half is identified as edge strip and forms the bright wisp virtual image in the back plate surface of touch screen body in the bright wisp image, namely when the last direction of bright wisp image is the direction of this back plate surface of the outstanding touch screen body of edge strip, the bright wisp real image is last, the bright wisp virtual image is following, and the size of bright wisp real image and the bright wisp virtual image respectively is half of bright wisp image.
In the present embodiment, increased where parts of images is that bright wisp real image, which part are the steps of the bright wisp virtual image in the identification bright wisp image, identified bright wisp real image and the bright wisp virtual image, just can more precisely orient touch objects in the position that touches on the plane.
As shown in Figure 4, among embodiment, described step S500 specifically comprises therein:
S520: calculate the weighted mean value of the gray-scale value of described bright wisp real image respectively, and the weighted mean value of the gray-scale value of the described bright wisp virtual image;
S540: according to the weighted mean value of the gray-scale value of described bright wisp real image, and the weighted mean value of the gray-scale value of the described bright wisp virtual image is drawn energy waveform figure;
S560: the useful signal that obtains described optical imagery touch-screen by the described energy waveform figure that draws.
When handling position, bright wisp framing touch point, calculate the weighted mean value of the gray-scale value of bright wisp real image and the bright wisp virtual image respectively, draw energy waveform figure, when touching, touching energy that object shelters from the zone of light will be very little even do not have an energy, will be in energy waveform figure produce power waveform pit, the position of this energy waveform pit is exactly the angle that touches the object place, the angle of the touch location that photographed according to a plurality of cameras can be calculated touch objects at the two-dimensional coordinate that touches on the plane with trigonometric function.Draw according to the weighted mean value of bright wisp real image and bright wisp virtual image gray-scale value owing to drawing before energy waveform figure, so the energy waveform figure that draws out is more accurate, the position of energy waveform endocrator and data also can be more accurate, thereby can more precisely orient touch objects in the position that touches on the plane.
Among embodiment, described edge strip is pasted with the reflective edge strip of reflector layer for the surface therein.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. optical imagery touch-screen, it is characterized in that, comprise touch screen body, camera and a plurality of edge strip, described camera is arranged on two jiaos on one side of described touch screen body, described edge strip is arranged on other limit of described touch screen body, and the back plate surface of described touch screen body is smooth surface.
2. optical imagery touch-screen according to claim 1 is characterized in that, described edge strip is pasted with the reflective edge strip of reflector layer for the surface.
3. optical imagery touch-screen according to claim 1 is characterized in that, described edge strip is provided with the luminous edge strip of light emitting source for the surface.
4. according to claim 1 or 2 or 3 described optical imagery touch-screens, it is characterized in that described touch screen body and described backboard are rectangle, the quantity of described edge strip is three, and the height of the outstanding described touch screen body of described edge strip is 10 millimeters.
5. according to claim 1 or 2 or 3 described optical imagery touch-screens, it is characterized in that described camera is infrared camera.
6. an optical imagery touch-screen useful signal adds strong method, it is characterized in that, on two jiaos on one side of described touch screen body camera is set respectively, on other edge strip of described touch screen body edge strip is set, the back plate surface of described touch screen body is smooth surface;
Described optical imagery touch-screen useful signal adds strong method and comprises step:
Take by described camera and to obtain the bright wisp virtual image that bright wisp real image that described edge strip forms and described edge strip form in the back plate surface of described touch screen body;
Obtain the useful signal of optical imagery touch-screen according to described bright wisp real image and the described bright wisp virtual image.
7. optical imagery touch-screen useful signal according to claim 6 adds strong method, it is characterized in that described step is taken the bright wisp real image and the described edge strip that obtain described edge strip formation by described camera and specifically comprised in the bright wisp virtual image of the back plate surface formation of described touch screen body:
Take the bright wisp image that obtains described edge strip by described camera;
The direction that defines the back plate surface of the outstanding described touch screen body of described edge strip is last, the first half in the described bright wisp image is identified as the bright wisp real image that described edge strip forms, and described bright wisp image lower middle portion is identified as described edge strip and forms the bright wisp virtual image in the back plate surface of described touch screen body.
8. optical imagery touch-screen useful signal according to claim 7 adds strong method, it is characterized in that, the useful signal that described step is obtained the optical imagery touch-screen according to described bright wisp real image and the described bright wisp virtual image specifically comprises:
Calculate the weighted mean value of the gray-scale value of described bright wisp real image respectively, and the weighted mean value of the gray-scale value of the described bright wisp virtual image;
According to the weighted mean value of the gray-scale value of described bright wisp real image, and the weighted mean value of the gray-scale value of the described bright wisp virtual image is drawn energy waveform figure;
Obtain the useful signal of described optical imagery touch-screen by the described energy waveform figure that draws.
9. add strong method according to claim 6 or 7 or 8 described optical imagery touch-screen useful signals, it is characterized in that, described edge strip is pasted with the reflective edge strip of reflector layer for the surface.
10. add strong method according to claim 6 or 7 or 8 described optical imagery touch-screen useful signals, it is characterized in that, described edge strip is provided with the luminous edge strip of light emitting source for the surface.
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| US4811004A (en) * | 1987-05-11 | 1989-03-07 | Dale Electronics, Inc. | Touch panel system and method for using same |
| US20040061689A1 (en) * | 2000-03-31 | 2004-04-01 | Takahiro Ito | Coordinate input and detection device and information display and input apparatus |
| CN201145890Y (en) * | 2007-11-01 | 2008-11-05 | 复旦大学 | Infrared camera shooting orientation detection touch screen system |
| CN101847060A (en) * | 2009-03-27 | 2010-09-29 | 联想(北京)有限公司 | Optical touch system and optical touch positioning method |
| CN102646003A (en) * | 2011-02-18 | 2012-08-22 | 原相科技股份有限公司 | Sensing system |
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2013
- 2013-05-23 CN CN201310196862.1A patent/CN103268172B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811004A (en) * | 1987-05-11 | 1989-03-07 | Dale Electronics, Inc. | Touch panel system and method for using same |
| US20040061689A1 (en) * | 2000-03-31 | 2004-04-01 | Takahiro Ito | Coordinate input and detection device and information display and input apparatus |
| CN201145890Y (en) * | 2007-11-01 | 2008-11-05 | 复旦大学 | Infrared camera shooting orientation detection touch screen system |
| CN101847060A (en) * | 2009-03-27 | 2010-09-29 | 联想(北京)有限公司 | Optical touch system and optical touch positioning method |
| CN102646003A (en) * | 2011-02-18 | 2012-08-22 | 原相科技股份有限公司 | Sensing system |
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