CN104076987A - Optical touch control device - Google Patents
Optical touch control device Download PDFInfo
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- CN104076987A CN104076987A CN201310097651.2A CN201310097651A CN104076987A CN 104076987 A CN104076987 A CN 104076987A CN 201310097651 A CN201310097651 A CN 201310097651A CN 104076987 A CN104076987 A CN 104076987A
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Abstract
The invention discloses an optical touch control device, which is arranged on a display screen and is used for identifying a touch control position of a nonluminous touch control body on the display screen when images obtained in the normal work state of camera modules have black backgrounds. The optical touch control device comprises at least two camera modules, a light source and a control panel. When the optical touch control device is applied, the nonluminous touch control body can be identified in the black background, so reflecting strips or light guide strips around the screen can be removed, and other parts except optical assemblies can be completely not projected out of a touch surface. Further, the reflecting strips or the light guide strips around the screen can be removed, so the integral cost of the optical touch control device is reduced, meanwhile, the production process is greatly simplified, and the production qualification rate is also improved. In addition, during the application of the optical touch control device, the optical assemblies can be as small as possible, and the light-resistant performance is also greatly improved.
Description
Technical field
The present invention relates to touch technology field, particularly a kind of optical touch control apparatus.
Background technology
At present, the touch-control scheme main flow that is applicable to small-medium size (be approximately 32 inches following) on market is condenser type, infrared display and optical profile type.
For condenser type, when the more bigger yield of touching size will sharply decline, so cost is very high; And most capacitance plates have requirement to touch-control body, cannot touch with the hand with gloves; Have, capacitance plate is a kind of thermally sensitive touching device again, therefore at the larger use scenes of some high low temperature range, cannot be widely used.
For infrared array type, due to cost and reasons in structure, it is close especially that infrared LED can not be placed, and accuracy of identification is affected.Therefore the writing effect of thin pen is not good.
Owing to there are the problems referred to above in condenser type and infrared array formula, most optical touch-control devices that adopt in the market.
For optical profile type, conventionally there are two large class contactor control devices: a class is that black background adds luminous touch control body, another kind of is that white background adds lighttight touch object.So-called black background, refers to while taking by video camera, background is black substantially in the image of taking; So-called white background, refers to while taking by video camera, background becomes white substantially in the image of taking.
Referring to Fig. 1, it is the contactor control device that black background adds luminous touch control body, this contactor control device (can be charge coupled cell (CCD by two or more infrared camera modules that are placed on the adjacent corner of indicator screen, Charge Coupled Device) or metal oxide semiconductor device (CMOS, Complementary Metal-Oxide Semiconductor)) take pictures.Under camera module normal operating conditions, gained image is black background, it is luminous after luminous touch control body (as luminous touch control pen) is touching touch face, after the touch face of being lifted away from, close light source, like this, by identifying this luminous touch control body, identify position of touch, by the trigonometric coordinates of luminous touch control object and infrared camera module, obtain the screen coordinate of luminous touch control pen.
For above-mentioned optical touch control apparatus, touch-control body is necessary for luminophor, otherwise gained image is black background None-identified at present under camera module normal operating conditions.
Referring to Fig. 2, it is the contactor control device that white background adds lighttight touch object, and this contactor control device is taken pictures by two or more infrared camera modules (can be CCD or cmos sensor) that are placed on the adjacent corner of display.Screen edge frame structure goes out a background light source.When shelter (as finger or any light tight object) touch screen, this object just blocked background light source the image of corresponding touch location, the image that has blocked background light source by analyzing this, obtain the position of shelter, and by the triangle relation of shelter position and infrared camera module, obtain the screen coordinate of shelter.
For above-mentioned optical touch control apparatus, if touch-control body is lighttight shelter, under camera module normal operating conditions, gained image is necessary for white background, otherwise the position on screen of this touch-control body of None-identified.In order to realize gained image under camera module normal operating conditions, it is white background, need to many reflecting strips and the light-strips that exceed touch-control plane be set in screen surrounding, and this comprises that exceeding the reflecting strips of touch-control plane and the contactor control device of light-strip cannot apply in the touch-control all-in-one machine of a lot of small-medium sizes.
Due to reflecting strips and light-strip occupied whole contactor control device Material Cost quite a few, the technique of simultaneously pasting reflecting strips or light-strip is more loaded down with trivial details, so production cost is high, complex manufacturing.
When under camera module normal operating conditions, gained image is white background, may there is along with the carrying of complete machine small variation in the picture position of the background light source that in prior art scheme, camera module photographs, this just requires effective optical touch control apparatus need to have dynamic malformation backoff algorithm, so algorithm complex is high.
Prior art scheme for searching lighttight touch object (being equivalent to black touch-control body) in white background, consider reflecting strips scheme: require in close camera module position nearby, touch-control body can not be by light source photograph in the corresponding position of white background too bright, otherwise have touch-control body to enter with regard to None-identified; This requirement need to increase spacer assembly at light source place, to avoid the object very near apart from light source to be illuminated and None-identified, so light path design is very difficult, very difficult very little that optical module is done.
Considering light resistance problem, when sunlight shines directly into touch object, can there is the phenomenon that touch object becomes white picture in camera module in prior art, and background light source cannot distinguish completely, thereby cannot the in the situation that of direct sunlight, use.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of optical touch control apparatus, to solve the problems referred to above that in prior art, optical touch-control device exists.
For achieving the above object, the embodiment of the invention discloses a kind of optical touch control apparatus, be arranged on indicator screen, identify the not position of touch of luminous touch control body on indicator screen when gained image is black background under camera module normal operating conditions, described optical touch control apparatus comprises: at least two camera modules, light source, control panel, wherein
Described at least two camera modules, are arranged on the adjacent corner of described indicator screen, to preset frame per second, take the plane vertical with described indicator screen, send the image photographing to control panel;
Described light source, identical with the number of described camera module, each light source is arranged on a side of a camera module of next-door neighbour, and described light source is accepted the control of control panel, luminous according to the signal of described control panel, to illuminate parallel and to be close to the region of described indicator screen;
Described control panel, be arranged on the rear side of described indicator screen, be electrically connected to described camera module and light source, when described camera module photographic images, controlling described light source is open mode, and, according to the image from camera module receiving, calculate whether have described in screen described in luminous touch control body touch-control not, and the position of touch on indicator screen of luminous touch control body not described in calculating.
Wherein, the camera lens horizontal field of view angle of described camera module is greater than 90 °.
Wherein, described light source levels lighting angle is greater than 90 °, and vertical light-emitting angle is less than default vertical angle threshold value.
Wherein, when described light source vertical light-emitting angle is more than or equal to default vertical angle threshold value, described optical touch control apparatus also comprises:
Light lens, the number of described light lens is identical with described light source, each light lens is arranged on the front side of a light source, with the light that light source is sent, on vertical angle, converges, and makes the concentration of energy of light in the region based on being parallel to indicator screen surface.
Wherein, described optical touch control apparatus comprises screen protective device, and described screen protective device is arranged on the place ahead of described indicator screen, and to protect described indicator screen, described screen protective device is transparent rigid material.
Wherein, described screen protective device is glass or acrylic.
Wherein, described control panel, also, for when image-position sensor photographic images is complete, closes described light source.
Wherein, the signal of described control panel control light source luminescent is pulsed current signal; The average current value that the current value of described pulsed current signal is greater than light source while opening, the peak point current when being less than light source and opening.
Wherein, described camera module is CCD or cmos sensor.
Wherein, described control panel comprises single-chip microcomputer and peripheral circuit, or described control panel comprises DSP and peripheral circuit.
The optical touch control apparatus that the application embodiment of the present invention provides, owing to can identify non-luminous touch-control body under black background, thereby can remove reflecting strips or the light-strip of screen surrounding, make other parts except optical module can completely outstanding touch-surface.
And then, owing to can removing reflecting strips or the light-strip of surrounding, the holistic cost of optical touch control apparatus is reduced, simplified greatly production technology simultaneously, also improved production yield.
Because contactor control device in the embodiment of the present invention is black background, thereby avoided the picture position of background light source under white background that small variation occurs along with the carrying of complete machine and the high problem of algorithm complex that causes; In the embodiment of the present invention, owing to being black background, thereby make this subtle change not affect the result of obtaining of image completely, therefore reduced algorithm complex, reduced error probability.
Have again, in prior art, be to search lighttight touch object (being equivalent to black touch-control body) in white background, therefore require in close camera module position nearby, touch-control body can not be by light source photograph in the corresponding position of white background too bright, otherwise have touch-control body to enter with regard to None-identified; Based on this requirement, prior art be difficult to optical module as the assemblies such as light source, camera module combine and do very little, otherwise too bright by light source photograph of touch-control cognition nearby causes camera module cannot obtain the image that can identify touch-control body.After adopting the scheme of the embodiment of the present invention, just can not need to consider these factors completely, that optical module can be done is as far as possible little.Accordingly, touch-control body recognizer difficulty nearby has also reduced a lot.
Considering light resistance problem, when sunlight shines directly into touch object, can there is the phenomenon that touch object becomes white picture in camera module in prior art, and background light source cannot distinguish completely, thereby cannot the in the situation that of direct sunlight, use.After the scheme that the employing embodiment of the present invention provides, can accomplish no matter whether direct sunlight can recognize touch-control body to touch-control body, therefore improve greatly light resistance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of optical touch control apparatus structural representation of prior art;
Fig. 2 is the another kind of optical touch control apparatus structural representation of prior art;
Fig. 3 is a kind of optical touch control apparatus structural representation according to the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 3, it is a kind of optical touch control apparatus structural representation according to the embodiment of the present invention.Contactor control device shown in Fig. 3 is arranged on indicator screen, for gained image under camera module normal operating conditions, be in black background situation, to identify the not position of touch of luminous touch control body on indicator screen, optical touch control apparatus shown in Fig. 3 can comprise: at least two camera modules 310, light source 320, control panel 330, wherein
At least two camera modules 310, are arranged on the adjacent corner of described indicator screen, to preset frame per second, take the plane vertical with described indicator screen, send the image photographing to control panel 330;
Above-mentioned each camera module comprises imageing sensor and camera lens, wherein, camera lens is used for projecting image onto imageing sensor, and imageing sensor, for taking the plane vertical with described indicator screen to preset frame per second, sends the image photographing to control panel.
For example, in the embodiment shown in fig. 3, be provided with two camera modules 310, wherein imageing sensor is CMOS or ccd sensor, can or be face battle array (Array Sensor) sensor for linear array (Line Sensor).The camera lens of each camera module needs to photograph whole touch-control surface, so the horizontal field of view angle of this camera module group lens need to be greater than 90 °.
Above-mentioned default frame per second can be for 60 frames per second etc., and certainly, concrete numerical value can convert according to the actual requirements.
Light source 320, identical with the number of described camera module 310, each light source 320 is arranged on a side of a camera module of next-door neighbour, and described light source 320 is accepted the control of control panel 330, luminous according to the signal of described control panel 330, to illuminate parallel and to be close to the region of described indicator screen;
Here, the side that each light source 210 is arranged on a camera module of next-door neighbour comprises, concrete, each light source 320 can be arranged on upper and lower, the left or right side of camera module.Light source levels lighting angle is greater than 90 °, and light source vertical light-emitting angle is less than default vertical angle threshold value as 15 °.Not too large vertical light-emitting angle can guarantee that the energy of light mainly concentrates on the region that is basically parallel to indicator screen surface, to illuminate the touch-control body that approaches indicator screen.
Above-mentioned by the parallel of light illuminating and to be close to the region of described indicator screen actual in being parallel to indicator screen and having certain thickness region, the size in this region can be adjusted according to the actual requirements.
Above-mentioned light source 320 is controlled by control panel 330, can in moment, pass through very large electric current by pulse lighting mode, sends very bright light, touch-control body can be illuminated so as far as possible, and guarantee the touch-control body of farthest also to illuminate.
It should be noted that, above-mentioned light source can be infrared light; In addition, the camera lens in aforementioned camera module can be with infrared filter.
Control panel 330, be arranged on the rear side of described indicator screen, be electrically connected to described camera module 310 and light source 320, when described camera module 310 photographic images, controlling described light source 320 is open mode, and, according to the image from camera module 310 receiving, calculate whether have described in screen described in luminous touch control body touch-control not, and the position of touch on indicator screen of luminous touch control body not described in calculating.
Above-mentioned control panel can comprise single-chip microcomputer and peripheral circuit, or above-mentioned control panel comprises digital signal processing (DSP, Digital Signal Processing) and peripheral circuit.
Concrete, control panel calculates whether there is not screen described in luminous touch control body touch-control, and the position of touch on indicator screen of luminous touch control body not described in calculating, the algorithm adopting itself is prior art, here adopted specific algorithm is not limited, and, adopted specific algorithm is not elaborated again yet.For example, when having touch-control body to approach indicator screen surface, camera module just can photograph it by the image of light illuminating and pass to control panel, the information of the comprehensive a plurality of camera modules of control panel, calculates the current coordinate of touch-control body by the coordinate calculating of corresponding lens correction, point, the coupling of point, the level and smooth scheduling algorithm of point; When there is no touch-control body, the image that camera module photographs is the relatively low image of brightness, thereby can distinguish, has or not control object.
The signal that above-mentioned control panel is controlled light source luminescent is pulsed current signal; The average current value that the current value of this pulsed current signal is greater than light source while opening, the peak point current when being less than light source and opening.Why using larger electric current is in order to guarantee, the touch-control body of farthest also to be illuminated.And in order to increase the life-span of light source, above-mentioned control panel 330 can also be closed described light source when image-position sensor photographic images is complete, like this, allow light source keep interrupted illuminating state but not lasting illuminating state, thus very big serviceable life of having improved light source.Meanwhile, in order to guarantee to capture at any time, whether have touch-control body contact indicator screen surface, the interrupted ignition frequency of light source can be very high, for example, can per secondly light 120 inferior.
It should be noted that, when light source vertical light-emitting angle is more than or equal to default vertical angle threshold value as 15 °, optical touch control apparatus shown in Fig. 3 can also comprise: light lens 340, the number of this light lens 340 is identical with the number of described light source, each light lens is arranged on the front side of a light source, with the light that light source is sent, on vertical angle, converge, make the concentration of energy of light in the region based on being parallel to indicator screen surface.By light lens is installed, relaxed the requirement to light source vertical light-emitting angle, for example, the vertical light-emitting angle of light source can be greater than 30 °, like this, has reduced manufacturing technique requirent, has improved production efficiency.
It should be noted that; optical touch control apparatus shown in Fig. 3 can also comprise screen protective device 350; this screen protective device is arranged on the place ahead of described indicator screen; to protect described indicator screen; make it avoid sustaining damage because of touch action; this screen protective device can be transparent rigid material, for example, can be glass or acrylic.
It should be noted that, for guarantee that camera module can take by the image of light illuminating, when optical touch control apparatus shown in production drawing 3, can camera module be installed on the corner of indicator screen fast and accurately by volume production tool and related software, and guarantee to there is satisfactory horizontal tilt angle and feathering angle after this camera module is fixed.Here horizontal tilt angle refers to the camera lens axial line of camera module and the angle of indicator screen place plane; Feathering angle refers to the angle between axial line and 45° angle.
In process of production, can fix camera module by above-mentioned volume production tool, and the image of taking by this camera module, utilize the software matching with described volume production tool to regulate horizontal tilt angle and feathering angle; And the image of taking by this camera module can also arrange shooting relevant information, as the row information of image used etc.
Visible, the optical touch control apparatus that the application embodiment of the present invention provides, owing to can identify non-luminous touch-control body under black background, thereby can remove reflecting strips or the light-strip of screen surrounding, make other parts except optical module can completely give prominence to touch-surface.
And then, owing to can removing reflecting strips or the light-strip of surrounding, the holistic cost of optical touch control apparatus is reduced, simplified greatly production technology simultaneously, also improved production yield.
Because contactor control device in the embodiment of the present invention is black background, thereby avoided the picture position of background light source under white background that small variation occurs along with the carrying of complete machine and the high problem of algorithm complex that causes; In the embodiment of the present invention, owing to being black background, thereby make this subtle change not affect the result of obtaining of image completely, therefore reduced algorithm complex, reduced error probability.
Have again, in prior art, be to search lighttight touch object (being equivalent to black touch-control body) in white background, therefore require in close camera module position nearby, touch-control body can not be by light source photograph in the corresponding position of white background too bright, otherwise have touch-control body to enter with regard to None-identified; Based on this requirement, very difficult very little that optical module is done of prior art.After adopting the scheme of the embodiment of the present invention, just can not need to consider these factors completely, that optical module can be done is as far as possible little.Accordingly, touch-control body recognizer difficulty nearby has also reduced a lot.
Considering light resistance problem, when sunlight shines directly into touch object, can there is the phenomenon that touch object becomes white picture in camera module in prior art, and background light source cannot distinguish completely, thereby cannot the in the situation that of direct sunlight, use.After the scheme that the employing embodiment of the present invention provides, can accomplish no matter whether direct sunlight can recognize touch-control body to touch-control body, therefore improve greatly light resistance.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Each embodiment in this instructions all adopts relevant mode to describe, between each embodiment identical similar part mutually referring to, each embodiment stresses is the difference with other embodiment.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. an optical touch control apparatus, it is characterized in that, be arranged on indicator screen, identify the not position of touch of luminous touch control body on indicator screen when gained image is black background under camera module normal operating conditions, described optical touch control apparatus comprises: at least two camera modules, light source, control panel, wherein
Described at least two camera modules, are arranged on the adjacent corner of described indicator screen, to preset frame per second, take the plane vertical with described indicator screen, send the image photographing to control panel;
Described light source, identical with the number of described camera module, each light source is arranged on a side of a camera module of next-door neighbour, and described light source is accepted the control of control panel, luminous according to the signal of described control panel, to illuminate parallel and to be close to the region of described indicator screen;
Described control panel, be arranged on the rear side of described indicator screen, be electrically connected to described camera module and light source, when described camera module photographic images, controlling described light source is open mode, and, according to the image from camera module receiving, calculate whether have described in screen described in luminous touch control body touch-control not, and the position of touch on indicator screen of luminous touch control body not described in calculating.
2. optical touch control apparatus according to claim 1, is characterized in that, the camera lens horizontal field of view angle of described camera module is greater than 90 °.
3. optical touch control apparatus according to claim 1, is characterized in that, described light source levels lighting angle is greater than 90 °, and vertical light-emitting angle is less than default vertical angle threshold value.
4. optical touch control apparatus according to claim 3, is characterized in that, when described light source vertical light-emitting angle is more than or equal to default vertical angle threshold value, described optical touch control apparatus also comprises:
Light lens, the number of described light lens is identical with described light source, each light lens is arranged on the front side of a light source, with the light that light source is sent, on vertical angle, converges, and makes the concentration of energy of light in the region based on being parallel to indicator screen surface.
5. according to the optical touch control apparatus described in claim 1 or 3; it is characterized in that, described optical touch control apparatus comprises screen protective device, and described screen protective device is arranged on the place ahead of described indicator screen; to protect described indicator screen, described screen protective device is transparent rigid material.
6. optical touch control apparatus according to claim 5, is characterized in that, described screen protective device is glass or acrylic.
7. according to the optical touch control apparatus described in claim 1 or 4, it is characterized in that described control panel also, for when image-position sensor photographic images is complete, is closed described light source.
8. according to the optical touch control apparatus described in claim 1 or 3, it is characterized in that, the signal that described control panel is controlled light source luminescent is pulsed current signal; The average current value that the current value of described pulsed current signal is greater than light source while opening, the peak point current when being less than light source and opening.
9. according to the optical touch control apparatus described in claim 1 or 3, it is characterized in that, described camera module is CCD or cmos sensor.
10. according to the optical touch control apparatus described in claim 1 or 3, it is characterized in that, described control panel comprises single-chip microcomputer and peripheral circuit, or described control panel comprises DSP and peripheral circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310097651.2A CN104076987A (en) | 2013-03-25 | 2013-03-25 | Optical touch control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310097651.2A CN104076987A (en) | 2013-03-25 | 2013-03-25 | Optical touch control device |
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| CN104076987A true CN104076987A (en) | 2014-10-01 |
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| CN201310097651.2A Pending CN104076987A (en) | 2013-03-25 | 2013-03-25 | Optical touch control device |
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| CN107146205A (en) * | 2017-03-21 | 2017-09-08 | 北京建筑大学 | A kind of distorted image correction method, position of touch recognition methods and device |
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