CN103309516A - Optical touch device and detection method thereof - Google Patents
Optical touch device and detection method thereof Download PDFInfo
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- CN103309516A CN103309516A CN201210065443XA CN201210065443A CN103309516A CN 103309516 A CN103309516 A CN 103309516A CN 201210065443X A CN201210065443X A CN 201210065443XA CN 201210065443 A CN201210065443 A CN 201210065443A CN 103309516 A CN103309516 A CN 103309516A
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Abstract
The invention discloses an optical touch device, which comprises a light source, a light source control unit, a light conduction element, an image sensor and a processing unit, wherein the light source control unit is used for controlling the light source to give out light with different luminances; the light conduction element is provided with a light injection surface, a touch surface and a light emitting surface; the light source injects incident light into the light conduction element from the light injection surface; a plurality of micro-structures are formed in the light conduction element and/ or on the light emitting surface; the micro-structures are used for reflecting the incident light to the touch surface to form scattered light; the image sensor is used for receiving reflection light emitted from the light emitting surface for generating corresponding image frames by corresponding to different luminances of the light source; the processing unit is used for calculating the difference image frames of the image frames; the operation state is judged according to the difference image frames.
Description
Technical field
The present invention relates to a kind of human-computer interface device, particularly a kind of suspension object and the optical touch control apparatus that contacts object and detection method thereof of detecting.
Background technology
The touch-control system separate type peripheral device of can arranging in pairs or groups in addition in use, be applicable to various human-computer interface devices therefore have splendid operation ease, and optical touch control system utilizes usually the reflected light of light sensors finger to judge position or the gesture of finger.
For example Figure 1A illustrates a kind of schematic diagram of known optical contactor control device.Described optical touch control apparatus 8 comprises light source 81, light guide plate 82 and optical sensor 83.Described light source 81 is injected incident light 811 from the incidence surface 821 of described light guide plate 82, it can be towards the direction transmission away from described incidence surface 821 in described light guide plate 82 owing to the total reflection phenomenon of described light guide plate 82.Can destroy the total reflection condition of described touch surface 822 when the touch surface 822 of the described light guide plate 82 of finger contact, the described incident light 811 of part is subject to the reflection of described finger and penetrates reflected light 812 and received by described optical sensor 83 from the exiting surface 823 of described light guide plate 82.Yet this optical touch control apparatus 8 can only be for detection of the finger of the described touch surface 822 of contact, and the detection that can't suspend.
Figure 1B is that United States Patent (USP) discloses No. 20090267919, and title is the schematic diagram of disclosed another kind of optical touch control apparatus in " multipoint touch position tracking device and use interaction systems and the multi-point interactive image processing method of this device ".Described optical touch control apparatus 9 comprises light source 91, light guide plate 92 and optical sensor 93 equally.Described light source 91 is injected incident light 911 from the incidence surface 921 of described light guide plate 92, the described incident light 911 of part can be towards the direction transmission away from described incidence surface 921 in described light guide plate 92 owing to the total reflection phenomenon on described light guide plate 92 surfaces.Form the total reflection condition that concaveconvex structure is used for destroying described touch surface 922 on the touch surface 922 of described light guide plate 92, so the described incident light 911 of part can penetrate outside the described light guide plate 92 from described touch surface 922.When the described touch surface 922 of finger close, can reflect the light that penetrates from described touch surface 922, make it to become the reflected light 912 that the exiting surface 923 towards described light guide plate 92 penetrates and received by described optical sensor 93.By this, described optical touch control apparatus 9 detection of object that can suspend.
The present invention then proposes a kind ofly can detect simultaneously suspension object and the optical touch control apparatus that contacts object and detection method thereof, and it also has advantages of can eliminate ambient light interference.
Summary of the invention
The purpose of this invention is to provide a kind of optical touch control apparatus and detection method thereof, for detection of the mode of operation of object.
Another object of the present invention provides a kind of optical touch control apparatus and detection method thereof, and it can eliminate the interference of surround lighting.
The invention provides a kind of optical touch control apparatus, comprise light source, light source control unit, light guide, imageing sensor and processing unit.It is luminous with different brightness that described light source control unit is controlled described light source.Described light guide has incidence surface, touch surface and exiting surface, it is inner that wherein said light source is injected into described light guide with incident light from described incidence surface, form a plurality of microstructures on described light guide inside and/or the described exiting surface, this microstructure is used for described incident light is made it to become scattered light towards described touch surface reflection.Described imageing sensor receives the reflected light that penetrates from described exiting surface, produces corresponding picture frame with the different brightness corresponding to described light source.Described processing unit calculates the difference diagram picture frame of described picture frame and according to described difference diagram picture frame decision operation state.
The present invention also provides a kind of detection method of optical touch control apparatus.Described optical touch control apparatus comprises light source, light guide, imageing sensor and processing unit; Described light guide has incidence surface, touch surface and exiting surface, forms a plurality of microstructures on described light guide inside and/or the described exiting surface.Described detection method comprises the following step: utilize described light source luminous with the first brightness and the second brightness in turn; Utilize described imageing sensor with sampling frequency obtain described light source incide described light guide and be subject to described microstructure reflection and towards the reflection of described touch surface, the reflected light that penetrates from described exiting surface again, producing the first picture frame corresponding to described the first brightness, and produce the second picture frame corresponding to described the second brightness; Utilize described processing unit to calculate the difference diagram picture frame of described the first picture frame and described the second picture frame; With the comparative result decision operation state that utilizes described processing unit according to described difference diagram picture frame and two threshold values.
The present invention also provides a kind of detection method of optical touch control apparatus.Described optical touch control apparatus comprises light source, light guide, imageing sensor and processing unit; Described light guide has incidence surface, touch surface and exiting surface, forms a plurality of microstructures on described light guide inside and/or the described exiting surface.Described detection method comprises the following step: utilize described light source luminous with the first brightness, the second brightness and the 3rd brightness in turn; Utilize described imageing sensor with sampling frequency obtain described light source incide described light guide and be subject to described microstructure reflection and towards the reflection of described touch surface, the reflected light that penetrates from described exiting surface again, to produce the first picture frame corresponding to described the first brightness, produce the second picture frame corresponding to described the second brightness, and produce the 3rd picture frame corresponding to described the 3rd brightness; Utilize described processing unit to calculate the first difference diagram picture frame of described the first picture frame and described the 3rd picture frame, and calculate the second difference diagram picture frame of described the second picture frame and described the 3rd picture frame; With the comparative result decision operation state that utilizes described processing unit according to described the first difference diagram picture frame and described the second difference diagram picture frame and at least one threshold value.
In the optical touch control apparatus of the present invention, described microstructure on the relative face of described touch surface and/or the inside of described light guide form, and do not form in described touch surface, described microstructure is used for incident light is reflected, make it to penetrate scattered light towards described touch surface, the generation type of wherein said microstructure there is no specific limited, forms the microstructure of the various shapes such as convex, concavo-convex or recess such as modes such as can utilizing printing, sandblast, etching, atomizing and mould pressing.In other words, described light guide plate utilizes the design of non-zeroth order (non-zero order) to form the scattered light light field that decays fast with distance in described touch surface the place ahead; When object enters described scattered light light field, can reflect reflected light towards described light guide and detect for the described imageing sensor that is positioned at described exiting surface side.
In the optical touch control apparatus of the present invention, the difference image that utilizes described imageing sensor to obtain is judged suspension object or contact object, thereby can effectively eliminate the impact of surround lighting, uses to increase and judges degree of accuracy.
In optical touch control apparatus of the present invention and the detection method thereof, the reflected light that described exiting surface penetrates is that the object of described touch surface side approaches and/or when contacting described touch surface, reflects the scattered light of described microstructure reflection, and makes it pass described light guide and form.
Description of drawings
Figure 1A and 1B illustrate the schematic diagram of known optical contactor control device.
Fig. 2 A illustrates the schematic diagram of the optical touch control apparatus of embodiment of the present invention to 2C.
Fig. 3 illustrates in the optical touch control apparatus of embodiment of the present invention, the schematic diagram that Image Acquisition and light source are lit a lamp.
Fig. 4 illustrates the process flow diagram of detection method of the optical touch control apparatus of one embodiment of the present invention.
Fig. 5 illustrates the process flow diagram of detection method of the optical touch control apparatus of another embodiment of the present invention.
Fig. 6 A illustrates in the embodiment of the present invention to 6C, the schematic diagram of difference diagram picture frame and threshold value.
Description of reference numerals
1 optical touch control apparatus, 11 light sources
111 incident lights, 112 scattered lights
113 reflected light, 12 light source control units
13 light guides, 131 incidence surfaces
132 touch surface, 133 exiting surfaces
134,134 ' microstructure, 14 imageing sensors
15 processing units, 16 transmission interface unit
2,2 ' object f1-f3 picture frame
S
31-S
34, S
41-S
44Step 8,9 optical touch control apparatus
81,91 light sources 82,92 light guide plate
811,911 incident lights 812,912 reflected light
821,921 incidence surfaces 822,922 touch surface
823,923 exiting surfaces 83,93 optical sensors
Th
1, Th
2, TH
1, TH
2Threshold value f
1-f
2, f
1-f
3, f
2-f
3The difference diagram picture frame
Embodiment
For make above and other objects of the present invention, feature and advantage can be more obvious, hereinafter will cooperate accompanying drawing to elaborate.In explanation of the present invention, identical member illustrates first at this with identical symbolic representation.
To shown in the 2C, it illustrates the schematic diagram of the optical touch control apparatus of embodiment of the present invention with reference to Fig. 2 A.Optical touch control apparatus 1 is for detection of the mode of operation of object 2, and wherein said object 2 for example can be finger, pointer or other touching control, there is no specific limited, as long as the light that the energy reflection source sends.Described mode of operation comprises suspension (hovering) state, and for example object 2, and the contact (touch) state, for example object 2 '.In addition, described optical touch control apparatus 1 also can be used for carrying out multi-point touch, is not limited to single-point touch.
The optical touch control apparatus 1 of present embodiment comprises light source 11, light source control unit 12, light guide 13, imageing sensor 14, processing unit 15 and transmission interface unit 16; Wherein, described light source control unit 12 can be contained in the described processing unit 15 or be independent of outside the described processing unit 15, there is no specific limited.
Described light source 11 is preferably light emitting diode, is used for sending for example infrared light, ruddiness or other invisible light.Described light source 11 is used for incident light 111 is injected into described light guide 13 inside from the incidence surface 131 of described light guide 13, makes it towards the direction transmission away from described incidence surface 131.In other words, described light source 11 arranges with respect to described incidence surface 131.
It is luminous with different brightness that described light source control unit 12 is used for controlling described light source 11.Described light source 11 is with the luminous purpose of different brightness, can eliminate by calculating the difference diagram picture frame interference (after being specified in) of surround lighting in the aftertreatment.Described light source control unit 12 is subjected to the control of described processing unit 15, so that described light source 11 is synchronous and luminous with the Image Acquisition of described imageing sensor 14, as shown in Figure 3.
Described light guide 13 can be that transparent material is made by the light that sends with respect to described light source 11 for example, such as glass or plastic cement etc., but be not limited to this.Described light guide 13 has described incidence surface 131, touch surface 132 and exiting surface 133; Wherein, described touch surface 132 and described exiting surface 133 are toward each other.Object 2 is positioned at a side of described touch surface 132 to control; Wherein, the function class that can control is similar to general optical touch control apparatus, therefore repeat no more in this.In the present embodiment, on the described exiting surface 133 of described light guide 13 (inside surface or outside surface) form a plurality of microstructures 134 (such as Fig. 2 A and 2B) and/or as described in the inside of light guide 13 form a plurality of microstructures 134 ' (such as Fig. 2 C); Wherein, described microstructure 134 such as modes such as can utilizing printing, sandblast, etching, atomizing and mould pressing forms the microstructure of the various shapes such as convex, concavo-convex or recess, microstructure 134 ' for example can be air, printing ink or other material that is mixed in when making described light guide 13 wherein, there is no specific limited, as long as can reflect the incident light 111 that described light source 11 is injected.Described microstructure 134 and 134 ' be used for described incident light 111 is become scattered light 112 to penetrate described light guide 13 towards described touch surface 132 reflections, described scattered light 112 be subject to being positioned at the described object 2,2 of described touch surface 132 sides ' reflection become reflected light 113, it again passes described light guide 13 and penetrates from described exiting surface 133.In the present embodiment, described microstructure 134,134 ' the total area and the area ratio of described exiting surface 133 preferably between 10% and 75%, so that described microstructure 134,134 ' can reflect enough incident lights 111, and make enough reflected light 113 penetrate described exiting surface 133.
Described imageing sensor 14 for example can be ccd image sensor, cmos image sensor or other sensor for the sense light energy, it is arranged at described exiting surface 133 sides and receives and obtain the described reflected light 113 that penetrates from described exiting surface 133 with sampling frequency, and produce corresponding picture frame (after being specified in) corresponding to the different brightness of described light source 11, and be sent to described processing unit 15 and carry out aftertreatment.
Described processing unit 15 calculates the difference diagram picture frame of described picture frame, and judges described mode of operation according to described difference diagram picture frame.
Described transmission interface unit 16 is used for described mode of operation being transferred to relevant electronic installation to control accordingly wired or wirelessly.
With reference to Fig. 2 A-2C, 3,4 and 6A shown in, Fig. 3 illustrates the operation chart that Image Acquisition and light source are lit a lamp in the optical touch control apparatus of embodiment of the present invention, Fig. 4 illustrates the process flow diagram of detection method of the optical touch control apparatus of an embodiment of the invention, 6A illustrates in the embodiment of the present invention, the schematic diagram of difference diagram picture frame and threshold value.The detection method of present embodiment comprises the following step: utilize light source in turn with the first brightness and luminous (the step S of the second brightness
31); Utilizing imageing sensor to obtain described light source with sampling frequency incides light guide and runs into microstructure and reflect towards touch surface, the reflected light that penetrates from exiting surface again, producing the first picture frame corresponding to described the first brightness, and produce the second picture frame (step S corresponding to described the second brightness
32); Utilize processing unit to calculate difference diagram picture frame (the step S of described the first picture frame and described the second picture frame
33); With comparative result decision operation state (the step S that utilizes described processing unit according to described difference diagram picture frame and two threshold values
34).
Step S
31: the described light source 11 of described light source control unit 12 controls is luminous with the first brightness (for example long rectangle of length) and the second brightness (for example shorter rectangle of length) in turn, shown in Fig. 3 (B); Wherein, described the first brightness is greater than described the second brightness, and described the second brightness can be zero luminance (namely not lighting) or non-zero luminance.
Step S
32: described imageing sensor 14 is with fixing sampling frequency, shown in Fig. 3 (A), obtain and penetrate from described touch surface 132 after inciding described light guide 13 by described incidence surface 131 and run into described microstructure 134,134 ' reflect from described light source 11, run into again the reflected light 113 that passes described light guide 13 and penetrate from described exiting surface 133 after described object 2,2 ' reflection, to produce the first picture frame f corresponding to described the first brightness
1, produce the second picture frame f corresponding to described the second brightness
2, and be sent to described processing unit 15 and carry out aftertreatment; Wherein, because described the first brightness is greater than described the second brightness, described the first picture frame f
1Average brightness value greater than described the second picture frame f
2Average brightness value.
Step S
33: described processing unit 14 calculates described the first picture frame f
1With described the second picture frame f
2Difference diagram picture frame (f
1-f
2).Because every picture frame f that described imageing sensor 14 obtains
1, f
2All include surround lighting, by calculating described difference diagram picture frame (f
1-f
2) can effectively eliminate the impact of surround lighting.
Step S
34: described processing unit 14 is according to described difference diagram picture frame (f
1-f
2) and the first threshold (threshold value that for example suspends Th
1) (for example contact threshold value Th with Second Threshold
2) comparative result judge that object is in suspended state or contact condition, as shown in Figure 6A.
For example in embodiment, as difference image frame (f
1-f
2) brightness value of partial image region or maximum brightness value are arranged greater than described first threshold Th
1And less than described Second Threshold Th
2The time, represent that described object 2 can be by 112 illuminations of described scattered light but do not contact yet described touch surface 132, therefore judge that described object 2 is suspended state; As difference image frame (f
1-f
2The brightness value of) ' have partial image region or maximum brightness value are greater than described Second Threshold Th
2The time, represent described object 2 ' contacted described touch surface 132 and can reflect a large amount of described scattered lights 112, therefore judge described object 2 ' be contact condition; As difference image frame (f
1-f
2) " brightness value of all pixels or maximum brightness value are less than described first threshold Th
1The time, represent described object neither the suspension object neither contact object.In this embodiment, with described difference diagram picture frame (f
1-f
2) part compare with two threshold values.
In another embodiment, as difference image frame (f
1-f
2) average brightness value greater than described first threshold Th
1And less than described Second Threshold Th
2The time, judge that described object 2 is suspended state; As difference image frame (f
1-f
2) ' average brightness value greater than described Second Threshold Th
2The time, judge described object 2 ' be contact condition.In this embodiment, with described difference diagram picture frame (f
1-f
2) integral body (being mean flow rate) and two threshold values compare.
With reference to Fig. 2 A-2C, 3,5 and 6B shown in, Fig. 5 illustrates the process flow diagram of detection method of the optical touch control apparatus of another embodiment of the present invention, Fig. 6 B illustrates in the embodiment of the present invention, the schematic diagram of difference diagram picture frame and threshold value.The detection method of present embodiment comprises the following step: utilize light source in turn with the first brightness, the second brightness and luminous (the step S of the 3rd brightness
41); Utilizing imageing sensor to obtain described light source with sampling frequency incides light guide and runs into microstructure and reflect towards touch surface, the reflected light that penetrates from exiting surface again, to produce the first picture frame corresponding to described the first brightness, produce the second picture frame corresponding to described the second brightness, and produce the 3rd picture frame (step S corresponding to described the 3rd brightness
42); Utilize processing unit to calculate the first difference diagram picture frame of described the first picture frame and described the 3rd picture frame, and calculate the second difference diagram picture frame (step S of described the second picture frame and described the 3rd picture frame
43); With comparative result decision operation state (the step S that utilizes described processing unit according to described the first difference diagram picture frame and described the second difference diagram picture frame and at least one threshold value
44).
Step S
41: the described light source 11 of described light source control unit 12 controls is luminous with the first brightness (for example the longest rectangle of length), the second brightness (for example length vice-minister's rectangle) and the 3rd brightness (for example the shortest rectangle of length) in turn, shown in Fig. 3 (C); Wherein, described the first brightness is greater than described the second brightness, and described the second brightness is greater than described the 3rd brightness, and described the 3rd brightness can be zero luminance (namely not lighting) or non-zero luminance.
Step S
42: described imageing sensor 14 is with fixing sampling frequency, shown in Fig. 3 (A), obtain and penetrate from described touch surface 132 after inciding described light guide 13 by described incidence surface 131 and run into described microstructure 134,134 ' reflect from described light source 11, be subject to again the reflected light 113 that passes described light guide 13 after described object 2,2 ' reflection and penetrate from described exiting surface 133, to produce the first picture frame f corresponding to described the first brightness
1, produce the second picture frame f corresponding to described the second brightness
2, and produce the 3rd picture frame f corresponding to described the 3rd brightness
3, and be sent to described processing unit 15 and carry out aftertreatment; Wherein, because described the first brightness is greater than described the second brightness, and described the second brightness is greater than described the 3rd brightness, so, described the first picture frame f
1Average brightness value greater than described the second picture frame f
2Average brightness value, and described the second picture frame f
2Described average brightness value greater than described the 3rd picture frame f
3Average brightness value.
Step S
43: described processing unit 15 calculates described the first picture frame f
1With described the 3rd picture frame f
3The first difference diagram picture frame (f
1-f
3), and calculate described the second picture frame f
2With described the 3rd picture frame f
3The second difference diagram picture frame (f
2-f
3); This step is used for eliminating the impact of surround lighting equally.
Step S
44: described processing unit 14 is according to described the first difference diagram picture frame (f
1-f
3) and described the second difference diagram picture frame (f
2-f
3) judge that with the comparative result of at least one threshold value object is in suspended state or contact condition, shown in Fig. 6 B.
For example in a kind of embodiment, as described the first difference diagram picture frame (f
1-f
3) the brightness value of partial image region or maximum brightness value greater than first threshold TH
1, and described the second difference diagram picture frame (f
2-f
3) brightness value of all pixels or maximum brightness value be less than Second Threshold TH
2The time, represent that described object 2 can be by stronger scattered light 112 illumination but can't by 112 illuminations of weak scattered light, therefore judge that described object is suspended state (shown in the left figure of Fig. 6 B).As described the second difference diagram picture frame (f
2-f
3) the brightness value of partial image region or described maximum brightness value greater than described Second Threshold TH
2The time, represent described object 2 ' can be by 112 illuminations of weak scattered light, therefore judge described object 2 ' be in contact condition (shown in the right figure of Fig. 6 B); Wherein, described first threshold TH
1Can equal or be not equal to described Second Threshold TH
2In other words, can be with described the first difference diagram picture frame (f in this embodiment
1-f
3) and described the second difference diagram picture frame (f
2-f
3) at least a portion and same threshold ratio or respectively with different threshold ratios.
In another embodiment, as described the first difference diagram picture frame (f
1-f
3) average brightness value greater than first threshold TH
1, and described the second difference diagram picture frame (f
2-f
3) average brightness value less than Second Threshold TH
2The time, judge that described object 2 is suspended state; As described the second difference diagram picture frame (f
2-f
3) described average brightness value greater than described Second Threshold TH
2The time, judge described object 2 ' be contact condition; Wherein, described first threshold TH
1Can equal or be not equal to described Second Threshold TH
2In other words, can be with described the first difference diagram picture frame (f in this embodiment
1-f
3) and described the second difference diagram picture frame (f
2-f
3) integral body (being mean flow rate) and same threshold ratio or respectively with different threshold ratios.
In another embodiment, also can first the difference diagram picture frame be carried out the impurity elimination news processes, for example described difference diagram picture frame filtering is formed the filtering image frame and disturbs (for example using low-pass filter) and bias light interference (for example using Hi-pass filter) to reduce noise, again with the maximal value of described filtering image frame and/or mean value and at least one threshold with the decision operation state; For example Fig. 6 C is with difference diagram picture frame (f
1-f
2) carry out convolution (convolution) to form the filtering image frame with wave filter.Scrutable is that the frequency spectrum of wave filter is not limited to can determine according to practical application shown in Fig. 6 C.
In other words, in the embodiments of the present invention, the eigenwert of poor component picture frame and at least one threshold value, to judge described mode of operation, wherein said eigenwert for example can be the maximal value of maximum brightness value, average brightness value, filtering image frame and/or the mean value of filtering image frame, but is not limited to this.
In sum, in the light guide plate of known optical contactor control device, by forming concaveconvex structure in touch surface to destroy the total reflection condition of described touch surface, so that light can penetrate from described touch surface.The present invention also proposes a kind of optical touch control apparatus (Fig. 2 A is to 2C) and detection method (Figure 4 and 5) thereof, wherein the touch surface of light guide is not formed for destroying the structure of total reflection condition fully, and can eliminate by calculating the difference diagram picture frame interference of surround lighting.
Although the present invention is open with aforementioned embodiments, yet it is not that any the technical staff in the technical field of the invention without departing from the spirit and scope of the present invention, can make various changes or modifications for restriction the present invention.Therefore protection scope of the present invention should be with being as the criterion that appending claims was defined.
Claims (20)
1. optical touch control apparatus, this optical touch control apparatus comprises:
Light source;
Light source control unit, it is luminous with different brightness that this light source control unit is controlled described light source;
Light guide, this light guide has incidence surface, touch surface and exiting surface, it is inner that wherein said light source is injected into described light guide with incident light from described incidence surface, be formed with a plurality of microstructures on described light guide inside and/or the described exiting surface, described microstructure is used for described incident light is made it to become scattered light towards described touch surface reflection;
Imageing sensor, this imageing sensor receives the reflected light that penetrates from described exiting surface, produces corresponding picture frame with the different brightness corresponding to described light source; With
Processing unit, this processing unit calculate the difference diagram picture frame of described picture frame and according to described difference diagram picture frame decision operation state.
2. optical touch control apparatus according to claim 1, it is luminous with the first brightness and the second brightness in turn that wherein said light source control unit is controlled described light source; Described imageing sensor produces the first picture frame corresponding to described the first brightness, and produces the second picture frame corresponding to described the second brightness; Described processing unit calculates the difference diagram picture frame of described the first picture frame and described the second picture frame; Described the first brightness is greater than described the second brightness.
3. optical touch control apparatus according to claim 2, wherein said processing unit also compare described difference diagram picture frame and first threshold and Second Threshold; When the eigenwert of described difference diagram picture frame during greater than described first threshold and less than described Second Threshold, be judged to be suspended state, when the described eigenwert of described difference diagram picture frame during greater than described Second Threshold, be judged to be contact condition.
4. optical touch control apparatus according to claim 3, wherein said eigenwert is maximal value and/or the mean value of maximum brightness value, average brightness value, filtering image frame.
5. according to claim 2, the described optical touch control apparatus of each claim in 3 or 4, wherein said the second zero luminance brightness or non-zero luminance.
6. optical touch control apparatus according to claim 1, it is luminous with the first brightness, the second brightness and the 3rd brightness in turn that described light source control unit is controlled described light source; Described imageing sensor produces the first picture frame corresponding to described the first brightness, produces the second picture frame corresponding to described the second brightness, and produces the 3rd picture frame corresponding to described the 3rd brightness; Described processing unit calculates the first difference diagram picture frame of described the first picture frame and described the 3rd picture frame, and calculate the second difference diagram picture frame of described the second picture frame and described the 3rd picture frame, wherein said the first brightness is greater than described the second brightness, and described the second brightness is greater than described the 3rd brightness.
7. optical touch control apparatus according to claim 6, wherein said processing unit also compare described the first difference diagram picture frame and described the second difference diagram picture frame and threshold value; When the eigenwert of described the first difference diagram picture frame greater than the eigenwert of described threshold value and described the second difference diagram picture frame during less than described threshold value, be judged to be suspended state, when the described eigenwert of described the second difference diagram picture frame during greater than described threshold value, be judged to be contact condition.
8. optical touch control apparatus according to claim 7, wherein said eigenwert is maximal value and/or the mean value of maximum brightness value, average brightness value, filtering image frame.
9. according to claim 6, the described optical touch control apparatus of each claim in 7 or 8, wherein said the 3rd zero luminance brightness or non-zero luminance.
10. optical touch control apparatus according to claim 1, the reflected light that wherein said exiting surface penetrates are that described scattered light is through the object reflection of described touch surface side and pass described light guide and form.
11. the detection method of an optical touch control apparatus, described optical touch control apparatus comprises light source, light guide, imageing sensor and processing unit, described light guide has incidence surface, touch surface and exiting surface, be formed with a plurality of microstructures on described light guide inside and/or the described exiting surface, described detection method comprises the following step:
Utilize described light source luminous with the first brightness and the second brightness in turn;
Utilizing described imageing sensor to obtain from described light source with sampling frequency is incident to described light guide and is subject to described microstructure towards the reflection of described touch surface, the reflected light that penetrates from described exiting surface again, to produce the first picture frame corresponding to described the first brightness and to produce the second picture frame corresponding to described the second brightness;
Utilize described processing unit to calculate the difference diagram picture frame of described the first picture frame and described the second picture frame; With
Utilize described processing unit to come the decision operation state according to the comparative result of described difference diagram picture frame and two threshold values.
12. detection method according to claim 11 wherein when the eigenwert of described difference diagram picture frame during greater than first threshold and less than Second Threshold, is judged to be suspended state; When the described eigenwert of described difference diagram picture frame during greater than described Second Threshold, be judged to be contact condition.
13. detection method according to claim 12, wherein said eigenwert are maximal value and/or the mean value of maximum brightness value, average brightness value, filtering image frame.
14. according to claim 11, the described detection method of each claim in 12 or 13, wherein said Second Threshold is zero luminance or non-zero luminance.
15. detection method according to claim 11, the reflected light that wherein said exiting surface penetrates are that the scattered light of described microstructure reflection is through the object reflection of described touch surface side and pass described light guide and form.
16. the detection method of an optical touch control apparatus, described optical touch control apparatus comprises light source, light guide, imageing sensor and processing unit, described light guide has incidence surface, touch surface and exiting surface, be formed with a plurality of microstructures on described light guide inside and/or the described exiting surface, described detection method comprises the following step:
Utilize described light source luminous with the first brightness, the second brightness and the 3rd brightness in turn;
Utilizing described imageing sensor to obtain from described light source with sampling frequency is incident to described light guide and is subject to described microstructure towards the reflection of described touch surface, the reflected light that penetrates from described exiting surface again, to produce the first picture frame corresponding to described the first brightness, to produce the second picture frame and produce the 3rd picture frame corresponding to described the 3rd brightness corresponding to described the second brightness;
Utilize described processing unit to calculate the first difference diagram picture frame of described the first picture frame and described the 3rd picture frame, and calculate the second difference diagram picture frame of described the second picture frame and described the 3rd picture frame; With
Utilize described processing unit to come the decision operation state according to the comparative result of described the first difference diagram picture frame and described the second difference diagram picture frame and at least one threshold value.
17. detection method according to claim 16 wherein during less than Second Threshold, is judged to be suspended state greater than the eigenwert of first threshold and described the second difference diagram picture frame when the eigenwert of described the first difference diagram picture frame; When the described eigenwert of described the second difference diagram picture frame during greater than described Second Threshold, be judged to be contact condition, wherein said first threshold equals or is not equal to described Second Threshold.
18. detection method according to claim 17, wherein said eigenwert are maximal value and/or the mean value of maximum brightness value, average brightness value, filtering image frame.
19. according to claim 16, the described detection method of each claim in 17 or 18, wherein said the 3rd threshold value is zero luminance or non-zero luminance.
20. detection method according to claim 16, the reflected light that wherein said exiting surface penetrates are that the scattered light of described microstructure reflection is through the object reflection of described touch surface side and pass described light guide and form.
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