CN106249965A - Light guide plate optical touch control apparatus - Google Patents
Light guide plate optical touch control apparatus Download PDFInfo
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- CN106249965A CN106249965A CN201510316509.1A CN201510316509A CN106249965A CN 106249965 A CN106249965 A CN 106249965A CN 201510316509 A CN201510316509 A CN 201510316509A CN 106249965 A CN106249965 A CN 106249965A
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Abstract
A kind of light guide plate optical touch control apparatus, including a light guide plate, an image acquisition unit, an optical signal injection unit, a microprocessor and an optical signal processing unit；When utilizing light guide plate to be touched, corresponding at least two light touched a little that pass through are made to be loaded with newly-increased low-frequency vibration signal, or produce FTIR signal further, and then make optical signal processing unit obtain few two spectral artifacts values, again by the microprocessor signal value that detected light signal processing unit sequentially exports within a cycle, then the time point occurred within this cycle respectively according at least two spectral artifacts value obtains this and touches positional information a little, and then the touching signals of output one correspondence.
Description
Technical field
The present invention is relevant contactor control device, is especially loaded with the light of modulating signal at leaded light about detecting
The position touched when propagating in plate, produces the contactor control device of relative control signal.
Background technology
There is many to combine the contactor control device of light guide plate, such as United States Patent (USP) US7432893 and disclose a kind of base
Defeated in suppressed inner total reflection (Frustrated Total Internal Reflection, FTIR)
Enter equipment, be that the light that at least two sends at the light source of diverse location is imported in light guide plate, and make
This light is propagated with completely internal reflection in light guide plate, the light that the most each light source is sent
All be evenly distributed in whole light guide plate, and the periphery of light guide plate arrange light sensor array with
The light that detecting is produced by light source.Light can be destroyed at leaded light when the surface of an object contact light guide plate
The total reflection propagated in plate, makes corresponding by the light attenuation (Attenuated) of this contact area；Profit
At least two light source detected at diverse location according to light sensor array with a processor is sent out
The deamplification of the light gone out, determines the position of this object with triangulation (Triangulation).
The TaiWan, China publication of US publication US20110074735 and correspondence
201005606, the TaiWan, China publication of US publication US20130044073 and correspondence
201203052, US publication US20120162144, US20120268403 and
US20130021300 etc. are the touch technology utilizing light guide plate respectively.
The above-mentioned touch technology utilizing light guide plate, is both needed to send at least two light source at diverse location
Light be directed respectively into light guide plate in carry out total reflection and propagate, and utilize processor according at least two light
The deamplification of the light that line sensor array detected at least two light source sends, with decision objects
Touch the position of light guide plate, and produce the touching signals of a correspondence.If but light is non-at a particular angle
Inject inside light guide plate, just cannot carry out inner total reflection inside light guide plate.Intense adjustment light
The work of angle is very difficult and needs the light-guide device coordinated to increase thickness or the face of contactor control device
Long-pending.If it addition, touch area a little the narrowest and small time, the tip of such as toothpick, will be unable to destroy light
The inner total reflection that line is propagated in light guide plate, and relative place's control signal cannot be obtained.
Applicant at TaiWan, China patent filed in 9 days January in 2014 " light vibration contactor control device ",
Application No. 103100878, though the problems referred to above can be solved, if but use scanning means time, one can be entered
Step increases cost and increases volume.
Summary of the invention
For further improved light guide board contactor control device, and the present invention is proposed.
The main object of the present invention, is providing a kind of light guide plate optical touch control apparatus, is utilizing light guide plate quilt
When touching, corresponding at least two light touched a little that pass through are made to be loaded with newly-increased low-frequency vibration signal, or
Produce FTIR signal further, and then make optical signal processing unit obtain few two spectral artifacts values,
Again by the microprocessor signal value that detected light signal processing unit sequentially exports within a cycle, then
The time point occurred within this cycle respectively according at least two spectral artifacts value obtains this and touches a little
Positional information, and then output one correspondence touching signals；Even if it is the narrowest and small to touch area a little,
Still can make to be loaded with newly-increased low-frequency vibration signal by the light touched a little, and then obtain this and touch a little
Positional information, can promote the utilitarian function of contactor control device.
Another object of the present invention, is providing a kind of light guide plate optical touch control apparatus, is making optical signal penetrate
The irradiant scope of unit, more than 90 angles, can irradiate the scope of the whole inside of light guide plate, therefore
Need not scanning means to reduce cost and reduce volume；And make image acquisition unit include a photosensitive battle array
Row and a camera lens, utilize camera lens to make the large-scale image of photosensitive array fechtable of little area, be not required in
Large-area multiple photo-sensitive cell is configured, it is possible to decrease cost around light guide plate.
The light guide plate optical touch control apparatus of the present invention, including:
One light guide plate；
The retroreflector of at least one strip；
The reflective membrane of at least one strip；
One microprocessor；
One optical signal injection unit, a corner of this light guide plate neighbouring；
One image acquisition unit, this optical signal injection unit neighbouring；This image acquisition unit includes one
Photosensitive array and a camera lens；This photosensitive array has multiple photosensitive unit；
One optical signal processing unit, is electrically connected this microprocessor and this image acquisition unit respectively；Should
Optical signal processing unit detects multiple signals that the plurality of photosensitive unit exports respectively, then processes described
Described signal value, corresponding to multiple signal values of the plurality of photosensitive unit, is then transmitted extremely by signal acquisition
This microprocessor；
Wherein the retroreflector of this at least one strip and the reflective membrane of this at least one strip are distinguished
It is located at a side end face of this light guide plate, the light making this optical signal injection unit penetrate, it is imported into this and leads
By the direction of retroeflection to this optical signal injection unit behind the inside of tabula rasa, it is then directed to this image capture
Unit, makes this image acquisition unit capture an image；Utilize an operation of a upper surface of this light guide plate
When district is touched, make this photosensitive array senses corresponding at least two light touched by one a little respectively
At least two photo-sensitive cell, export newly-increased low-frequency vibration signal respectively, or produce FTIR respectively
At least one signal in signal, and make this optical signal processing unit obtain at least two spectral artifacts value；
Within a cycle, the signal value that this optical signal processing unit sequentially exports is detected again by this microprocessor,
Then the time point occurred within this cycle respectively according to this at least two spectral artifacts value, it is thus achieved that should
Touch positional information a little, and then the touching signals of output one correspondence.
Wherein this image capturing unit is located at the lower section of a lower surface of this light guide plate；One first is guide-lighting single
The lower surface of unit's contact light guide plate；By the light of retroeflection to the direction of this optical signal injection unit, by this
First light element imports this image acquisition unit.
Wherein this optical signal injection unit is located at the lower section of this lower surface of this light guide plate；One second is guide-lighting
The lower surface of unit contact light guide plate；The light of this optical signal injection unit injection, by this second leaded light
Unit imports the inside of this light guide plate.
Wherein the light of this optical signal injection is the light being loaded with modulating signal；In this photosensitive array respectively
Sense other and there is no the corresponding multiple photosensitive units being touched multiple light a little by this, export respectively
These modulating signals multiple, make this optical signal processing unit obtain multiple normal corresponding to this modulating signal
Signal value.
Wherein this light guide plate is rectangular has four limits；The side end face on two limits of this light guide plate connects respectively
Touch two retroreflector；One end of these two retroreflector is respectively adjacent to optical signal injection unit；This light guide plate
The side end face on other two limits paste two reflective membranes respectively.
Wherein one retroreflector of side end face contact on a limit of this light guide plate；This light guide plate other three
The side end face on individual limit pastes three reflective membranes respectively.
Wherein this light guide plate is by can the flexible or inflexibility plate body made of guide-lighting material；This light
Signal injection unit is laser plane optical signal injection unit；This first light element and this second leaded light
Unit be cross section be the optical prism of triangle.
Wherein this upper surface of this light guide plate to should light in the scope shape of this light guide plate internal communication
Become this operating space.
Accompanying drawing explanation
Other objects of the present invention, effect, refer to drawings and Examples, describes in detail as follows, its
In:
Fig. 1 is the vertical view signal of the light guide plate optical touch control apparatus of object contact first embodiment of the invention
Figure.
Fig. 2 is the signal that light is propagated in the light guide plate optical touch control apparatus of first embodiment of the invention
Figure.
Fig. 3 is the schematic diagram of the corresponding photosensitive array of signal value of the present invention.
Fig. 4 is the schematic diagram of the light guide plate optical touch control apparatus of second embodiment of the invention.
Fig. 5 is the schematic diagram of the light guide plate optical touch control apparatus of third embodiment of the invention.
Detailed description of the invention
As shown in Figure 1, 2, the light guide plate optical touch control apparatus 1 of first embodiment of the invention, including one
30, the micro-process of 20, optical signal injection unit of 10, image capturing unit of light guide plate
50, first light element of 40, optical signal processing unit of device 60, one second is guide-lighting single
The retroreflector (Retro reflector) 81 of unit's 70, at least one strip and at least one strip
Reflective membrane 82 formed.
Light guide plate 10 has a side end face 13, lower surface 12, upper surface 11,.Light guide plate 10
The periphery of side forms side end face 13.Light guide plate 10 is rectangular, have four limits 101,102,103,
104.Light guide plate 10 by can the flexible or inflexibility plate body made of guide-lighting material, such as press
Gram force plate, resin plate or glass plate etc..First light element 60 and the second light element 70 can be
Cross section is the optical prism of triangle.
In the present embodiment, image capturing unit 20 and optical signal injection unit 30 are respectively arranged on leaded light
The lower section of the lower surface 12 of plate 10, a corner 14 of neighbouring light guide plate 10.First light element 60
And second light element 70 contact the lower surface 12 of light guide plate 10 respectively.Image capturing unit 20 and
Optical signal injection unit 30 is respectively adjacent to the first light element 60 and the second light element 70.Article two, return
One end of emitter 14 is adjacent to optical signal injection unit 30, and contact light guide plate 10 is corresponding to two limits
101, the side end face 13 of 104.Article two, reflective membrane 82 contact light guide plate 10 corresponding to two limits 102,
The side end face 13 of 103, is positioned at image capturing unit 20 and optical signal injection unit 30 the other side.
Optical signal injection unit 30 injection is loaded with the light 31 of modulating signal, via the second light element
70 are imported into light guide plate 10 inside, or can carry out inner total reflection propagation further inside light guide plate 10.
The scope of light 31 injection, more than 90 angles, is guided by the second light element 70 and irradiates whole leading
Scope within tabula rasa 10 and two reflective membranes 82.The corresponding light 31 in the upper surface 11 of light guide plate 10
Scope at this light guide plate 10 internal communication forms an operating space 100.Modulating signal can be modulation light
The signal of frequency, amplitude or phase place.Optical signal injection unit 30 can include that laser plane light is believed
Number injection unit etc..
Image acquisition unit 20 includes photosensitive array 21 and a camera lens 22, and camera lens 22 is adjacent to first
Light element 60.The light reflected by two reflective membranes 82, can be guided warp by the first light element 60
Irradiated photosensitive array 21 by camera lens 22, make image acquisition unit 20 fechtable guide-lighting by camera lens 21
Scope within plate 10 is the image of a strip.
Optical signal processing unit 50 is electrically connected image acquisition unit 20 and microprocessor 40 respectively.Light
Multiple modulations letter of photosensitive array 21 output of signal processing unit 50 detecting image acquisition unit 20
Number, then process described modulating signal and obtain the multiple signal values corresponding to photosensitive array 21, then
Described signal value is transmitted to microprocessor 40.
Optical signal injection unit 30 penetrates the light 31,32,33 being loaded with modulating signal simultaneously, respectively
Imported the inside of light guide plate 10 by the second light element 70, and irradiate whole operating space 100 and two
Reflective membrane 82.When light irradiates two reflective membranes 82 being positioned at two limits 102,103, will respectively
It is reflected back light guide plate 10 by two reflective membranes 82 internal, and is mapped to two retroreflector 81 respectively, then divide
Not via original path retroeflection to two reflective membrane 82, then reflexed to by two reflective membranes 82 respectively
Optical signal injection unit 30.Owing to there is scattering nature when light is propagated, penetrate so reflexing to optical signal
The light 31,32,33 going out unit 30 also can be mapped to lead adjacent to the first of optical signal injection unit 30
Light unit 60, and it is directed to image acquisition unit 20 by the first light element 60.
If do not have the upper surface 11 that object 90 touches light guide plate 10, optical signal injection unit 30 is penetrated
Go out to be loaded with the light 31 of modulating signal, propagate in light guide plate 10, reflect via two reflective membranes 82
During to photosensitive array 21, it is transferred into optical signal processing unit 50 by being only loaded with original modulating signal,
Therefore optical signal processing unit 50 is worth 23 by obtaining the normal signal corresponding to original modulating signal,
As shown in Figure 3.
If there being object 90 to carry out touch-control operation in operating space 100, touch or contact light guide plate 10
When the one of upper surface 11 touches a some P, light guide plate 10 can be vibrated, makes corresponding by touching a P
Light 31,32,33 be loaded with newly-increased low-frequency vibration signal, or produce FTIR signal further；
Photosensitive array 22 senses three photo-sensitive cells 221 of light 31,32,33 respectively, will be respectively
The low-frequency vibration signal that output is newly-increased, or produce at least one signal in FTIR signal, and make optical signal
Processing unit 50 obtains three spectral artifacts values 24；Other do not have corresponding by multiple light of P point
Line is transferred into optical signal processing unit 50 by being only loaded with original modulating signal, makes optical signal prosessing list
Unit 50 obtains multiple normal signal value 23 corresponding to original modulating signal, as shown in Figure 3.
Microprocessor 40 detected light signal processing unit 50 sequentially exports corresponding to photosensitive array 21
The signal value of each photo-sensitive cell 211, according to the time detecting spectral artifacts value within a cycle
Point, just can obtain the position of the photo-sensitive cell 221 of correspondence；Know the position of the photo-sensitive cell 211 of correspondence
Put the light that just can obtain correspondence, and then the angle between this light and limit 101 can be obtained.According to extremely
Few two correspondences, by touching the angle between the light of a P and limit 101, utilize known mathematics three
Angle computing formula, such as application United States Patent (USP) US 4, the Related Computational Methods disclosed in 762,990,
The coordinate information touching a P in operating space 100 can be obtained.Therefore microprocessor 40 foundation can be made
Relevant computational methods, it is thus achieved that touch the P coordinate information in operating space 100, and then export a pair
The touching signals answered.
The present invention also refers to the TaiWan, China publication the 201342161st of applicant's application and " swashs
Photoscanning input equipment " the middle coordinate computing technique disclosed, by microprocessor 40 within a cycle
The signal value that detected light signal processing unit 50 sequentially exports, then according to the improper letter of at least two
The time point that number value occurred respectively within this cycle obtains this and touches positional information a little, and then exports a pair
The touching signals answered.
The present invention also can first test the position touched a little that then record object touches the upper surface of light guide plate
Put at least two time point of the spectral artifacts value exported within a cycle with optical signal processing unit
Relevant information；Then make microprocessor according to this relevant information and according to optical signal processing unit one
At least two time point of the spectral artifacts value of output in cycle, it is thus achieved that object touches the upper of light guide plate
The positional information touched a little of end face.
The present invention also can only use a retroreflector 14, contact light guide plate 10 corresponding to two limits 101,
The side end face 13 on the one side in 104 or only make a retroreflector 14 be located at and image acquisition unit 21
Relative position, such as, be located at contact light guide plate 10 corresponding to limit 102 or the side end face 13 on limit 103
Position；And make the side end face 13 on other limits that light guide plate 10 is not in contact with retroreflector 14 stick respectively
Patch reflective membrane 15, namely makes optical signal injection unit 30 injection irradiate the light energy of operating space 100
Retroeflection, to the configuration mode of the image acquisition unit 20 of neighbouring optical signal injection unit 30, is attained by
Identical effect.
As shown in Figure 4, the light guide plate optical touch control apparatus 2 of second embodiment of the invention, except being not required to
First light element 60, image acquisition unit 20 is placed in the outside of a corner 14 of light guide plate 10；
It is internal that image acquisition unit 20 is directly absorbed light guide plate 10 by the outside of a corner 14 of light guide plate 10
Image, other structures are substantially identical with the light guide plate optical touch control apparatus of first embodiment, also can reach
To identical effect.The present embodiment is that to be applied to light guide plate 10 thicker, and image acquisition unit 20 can be straight
Connect the situation absorbing the image within light guide plate 10 via the side end face 13 of light guide plate 10.
As it is shown in figure 5, the light guide plate optical touch control apparatus 3 of third embodiment of the invention, except being not required to
Wanting the second light element 70, optical signal injection unit 30 is placed in a corner 14 of light guide plate 10
Outside, outside the light of optical signal injection unit 30 injection is directly by a corner 14 of light guide plate 10
The inside of light guide plate 10 is injected in side, other structures substantially with the light guide plate optical touch of first embodiment
Device is identical, also can reach identical effect.The present embodiment is that to be applied to light guide plate 10 thicker, light
The light of signal injection unit 30 injection directly can inject leaded light via the side end face 13 of light guide plate 10
Situation within plate 10.
It is a feature of the present invention that when utilizing light guide plate to be touched, make corresponding by touching a P at least
Article two, light is loaded with newly-increased low-frequency vibration signal, or produces FTIR signal further, and then makes light
Signal processing unit obtains few two spectral artifacts values, then is detected within a cycle by microprocessor
The signal value that optical signal processing unit sequentially exports, then according at least two spectral artifacts value respectively
The time point occurred within this cycle obtains this and touches positional information a little, and then exports touching of a correspondence
Control signal.
Even if the area that the present invention touches a little is the narrowest and small, light guide plate is touched at the tip of such as toothpick, leads
When tabula rasa is touched, the corresponding light touched a little that passes through still can be made to be loaded with newly-increased low-frequency vibration signal,
And then obtain this and touch positional information a little, the utilitarian function of contactor control device can be promoted.
The irradiant scope of optical signal injection unit of the present invention, more than 90 angles, can irradiate leaded light
The scope of the whole inside of plate, therefore need not scanning means and can reduce cost and reduce volume.
The image acquisition unit of the present invention includes a photosensitive array and a camera lens, utilizes camera lens to make little area
The large-scale image of photosensitive array fechtable, be not required to around light guide plate, configure large-area multiple sense
Optical element, it is possible to reduce cost.
Described above, only utilize the embodiment of the technology of the present invention content, any be familiar with this skill
Patient uses modification, the change that the present invention does, and all belongs to the right that the present invention is advocated.
Claims (10)
1. a light guide plate optical touch control apparatus, including:
One light guide plate；
The retroreflector of at least one strip；
The reflective membrane of at least one strip；
One microprocessor；
One optical signal injection unit, a corner of this light guide plate neighbouring；
One image acquisition unit, this optical signal injection unit neighbouring；This image acquisition unit includes one
Photosensitive array and a camera lens；This photosensitive array has multiple photosensitive unit；
One optical signal processing unit, is electrically connected this microprocessor and this image acquisition unit respectively；Should
Optical signal processing unit detects multiple signals that the plurality of photosensitive unit exports respectively, then processes described
Described signal value, corresponding to multiple signal values of the plurality of photosensitive unit, is then transmitted extremely by signal acquisition
This microprocessor；
Wherein the retroreflector of this at least one strip and the reflective membrane of this at least one strip are distinguished
It is located at a side end face of this light guide plate, the light making this optical signal injection unit penetrate, it is imported into this and leads
By the direction of retroeflection to this optical signal injection unit behind the inside of tabula rasa, it is then directed to this image capture
Unit, makes this image acquisition unit capture an image；Utilize an operation of a upper surface of this light guide plate
When district is touched, make this photosensitive array senses corresponding at least two light touched by one a little respectively
At least two photo-sensitive cell, export newly-increased low-frequency vibration signal respectively, or produce FTIR respectively
At least one signal in signal, and make this optical signal processing unit obtain at least two spectral artifacts value；
Within a cycle, the signal value that this optical signal processing unit sequentially exports is detected again by this microprocessor,
Then the time point occurred within this cycle respectively according to this at least two spectral artifacts value, it is thus achieved that should
Touch positional information a little, and then the touching signals of output one correspondence.
2. light guide plate optical touch control apparatus as claimed in claim 1, farther includes one first and leads
Light unit；This image capturing unit is located at the lower section of a lower surface of this light guide plate；This first guide-lighting list
The lower surface of unit's contact light guide plate；By the light of retroeflection to the direction of this optical signal injection unit, by this
First light element imports this image acquisition unit.
3. light guide plate optical touch control apparatus as claimed in claim 1, farther includes one second and leads
Light unit；This optical signal injection unit is located at the lower section of this lower surface of this light guide plate；This second leaded light
The lower surface of unit contact light guide plate；The light of this optical signal injection unit injection, by this second leaded light
Unit imports the inside of this light guide plate.
4. light guide plate optical touch control apparatus as claimed in claim 2, farther includes one second and leads
Light unit；This optical signal injection unit is located at the lower section of this lower surface of this light guide plate；This second leaded light
The lower surface of unit contact light guide plate；The light of this optical signal injection unit injection, by this second leaded light
Unit imports the inside of this light guide plate.
5. the light guide plate optical touch control apparatus as according to any one of Claims 1-4, wherein this light
The light of signal injection is loaded with the light of modulating signal；This photosensitive array senses respectively do not have
The corresponding multiple photosensitive units being touched multiple light a little by this, export this modulation multiple letter respectively
Number, make this optical signal processing unit obtain multiple normal signal values corresponding to this modulating signal.
6. light guide plate optical touch control apparatus as claimed in claim 5, the wherein rectangular tool of this light guide plate
There are four limits；The side end face on two limits of this light guide plate contacts two retroreflector respectively；These two retroeflection
One end of device is respectively adjacent to optical signal injection unit；The side end face on other two limits of this light guide plate is respectively
Paste two reflective membranes.
7. light guide plate optical touch control apparatus as claimed in claim 5, the wherein rectangular tool of this light guide plate
There are four limits；One retroreflector of side end face contact on one limit of this light guide plate；Other of this light guide plate
The side end face on three limits pastes three reflective membranes respectively.
8. light guide plate optical touch control apparatus as claimed in claim 5, wherein this upper end of this light guide plate
In the face of this operating space should be formed in the scope of this light guide plate internal communication by light.
9. light guide plate optical touch control apparatus as claimed in claim 6, wherein this light guide plate is by can be guide-lighting
The flexible or inflexibility plate body made of material；This optical signal injection unit is laser plane light letter
Number injection unit；This first light element and the optics rib that this second light element cross section is triangle
Mirror.
10. light guide plate optical touch control apparatus as claimed in claim 7, wherein this light guide plate is by leading
Flexible or the inflexibility plate body that the material of light is made；This optical signal injection unit is laser plane light
Signal injection unit；This first light element and this second light element be cross section be the optics of triangle
Prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510316509.1A CN106249965A (en) | 2015-06-10 | 2015-06-10 | Light guide plate optical touch control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510316509.1A CN106249965A (en) | 2015-06-10 | 2015-06-10 | Light guide plate optical touch control apparatus |
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| CN106249965A true CN106249965A (en) | 2016-12-21 |
Family
ID=57626883
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510316509.1A Pending CN106249965A (en) | 2015-06-10 | 2015-06-10 | Light guide plate optical touch control apparatus |
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| CN108038477A (en) * | 2018-01-05 | 2018-05-15 | 敦捷光电股份有限公司 | The protective shell of optical sensing |
| CN108985258A (en) * | 2018-05-23 | 2018-12-11 | 友达光电股份有限公司 | Optical detection device and detection method thereof |
| CN109426396A (en) * | 2017-08-22 | 2019-03-05 | 英属开曼群岛商音飞光电科技股份有限公司 | Light touch device |
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Application publication date: 20161221 |