CN103793104B - Optical touch system with luminance compensation function and method for compensating for luminance of optical touch system - Google Patents
Optical touch system with luminance compensation function and method for compensating for luminance of optical touch system Download PDFInfo
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- CN103793104B CN103793104B CN201210428550.4A CN201210428550A CN103793104B CN 103793104 B CN103793104 B CN 103793104B CN 201210428550 A CN201210428550 A CN 201210428550A CN 103793104 B CN103793104 B CN 103793104B
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Abstract
The invention discloses an optical touch system which comprises a touch surface, a plurality of image sensors and a plurality of compensation light sources. Each image sensor is adjacent to the corresponding compensation light source. When one of the image sensors acquires an image frame, the compensation light sources which are not adjacent to the image sensor and are positioned within a vision range of the image sensor emit light to compensate for luminance distribution of the image frame.
Description
Technical field
The present invention is with regard to a kind of optical touch control system, especially with regard to a kind of optical touch control system with luminance compensation
With its luminance compensation method.
Background technology
Optical touch control system generally obtains the multiple images frame comprising touch surface image using imageing sensor, and according to institute
State the change in location of finger-image in picture frame to carry out object tracking.
Referring for example to shown in Figure 1A, it shows the schematic diagram of known optical touch-control system 9, its include a touch surface 91,
Two imageing sensors 92,92 ' and multiple light-emitting sections 93.When described image sensor 92,92 ' obtains image, described
Rhizoma Dioscoreae (peeled) 93 is luminous so that described image sensor 92,92 ' receives the light of the light-emitting section 93.Whereby, when finger (not shown)
When contacting the touch surface 91, described image sensor 92,92 ' then can be obtained interdicts the light-emitting section 93 comprising the finger
The picture frame of the dark areas for being formed, processing unit (not shown) then can judge the finger position according to described image frame.
However, the corner of the touch surface 91 causes brightness discontinuous because of the setting angle of the light-emitting section 93, cause
Even if contacting the touch surface 91 without finger will also result in the acquired image frame brightness of described image sensor 92,92 ' point
Cloth is uneven, for example, there are dark areas d at three shown in Figure 1B1-d3.Therefore, when the processing unit carries out image procossing,
Then may cause to judge the situation of finger position by accident.
In view of this, the present invention also proposes a kind of optical touch control system with luminance compensation and its luminance compensation method,
It can adjust imageing sensor before dispatching from the factory and obtain the substantially uniform picture frame of Luminance Distribution.
The content of the invention
The purpose of the present invention is providing a kind of optical touch control system with luminance compensation and its luminance compensation method, its profit
The dark areas in picture frame are compensated with compensatory light, so that imageing sensor obtains the substantially uniform picture frame of Luminance Distribution.
Another object of the present invention providing a kind of optical touch control system with luminance compensation and its luminance compensation method, its
Utilisation system light source arranges in addition supplementary lighting sources to carry out dark space domain compensation.
The present invention provides a kind of optical touch control system, comprising touch surface, multiple reflecting strips, the first imageing sensor, first
Active light source and the second active light source.The reflecting strips are respectively arranged at multiple edges of the touch surface.First figure
As sensor is to obtain the picture frame across the touch surface.The adjacent described first image sensor of first active light source
Arrange.Second active light source is arranged at the corner of the touch surface and is located at the field range of described first image sensor
It is interior；Wherein, during described first image sensor obtains the first picture frame, first active light source is with the first Intensity LEDs
And second active light source, with the second Intensity LEDs, first brightness is more than second brightness, to compensate described first
The Luminance Distribution of picture frame.
The present invention a kind of optical touch control system is also provided, comprising touch surface, multiple light-emitting sections, the first imageing sensor and
Active light source.The light-emitting section is respectively arranged at multiple edges of the touch surface.Described first image sensor is to obtain
Across the picture frame of the touch surface.The active light source is arranged at the corner of the touch surface and passes positioned at described first image
Sensor is within sweep of the eye；Wherein, it is at least partly described luminous during described first image sensor obtains the first picture frame
Bar is luminous and the active light source lights, to compensate the Luminance Distribution of described first image frame.
In one embodiment, being provided with the corner of the touch surface of the active light source can separately arrange the second image biography
Sensor is to obtain the picture frame across the touch surface.
In one embodiment, can also arrange comprising the adjacent described first image sensor of the first active light source；First figure
It is not provided with as sensor and first active light source are arranged at the edge of the touch surface or are arranged at the touch surface
The corner of the active light source.
In the present embodiment, the active light source and first active light source for example can be point source, and it is used as compensation
Light source.
The present invention also provides a kind of luminance compensation method of optical touch control system, and the optical touch control system includes touch-control
Face, multiple strip-shaped light sources, multiple images sensor and multiple active light sources, and each described image sensor adjoins an institute
State active light source.The luminance compensation method is performed successively comprising the first mode of operation and the second mode of operation.Described first
The first imageing sensor obtains the first picture frame in mode of operation, does not adjoin described first image sensor and positioned at described first
The luminous Luminance Distribution to compensate described first image frame of the active light source of the field range of imageing sensor.Described second
The second imageing sensor obtains the second picture frame in mode of operation, does not adjoin second imageing sensor and positioned at described second
The luminous Luminance Distribution to compensate second picture frame of the active light source of the field range of imageing sensor.
In one embodiment, the strip-shaped light source is reflecting strips.Sense with described first image in first mode of operation
The adjacent active light source of device is with not adjacent described first image sensor and positioned at the visual field of described first image sensor
The active light source of scope is with different Intensity LEDs；Adjoin with second imageing sensor in second mode of operation
The active light source and the institute for not adjoining second imageing sensor and the field range positioned at second imageing sensor
Active light source is stated with different Intensity LEDs.
In one embodiment, the strip-shaped light source is light-emitting section.Sense with described first image in first mode of operation
The adjacent active light source of device does not light and does not adjoin described first image sensor and positioned at described first image sensor
The field range the active light source light；Adjoin with second imageing sensor in second mode of operation
The active light source does not light and does not adjoin second imageing sensor and positioned at regarding described in second imageing sensor
The active light source of wild scope lights.
In one embodiment, described image sensor and its adjacent active light source may be disposed at the edge of the touch surface or
Corner.
In one embodiment, when the number of light sources of the active light source is more than the number of sensors of described image sensor,
The active light source for not adjoining described image sensor is arranged at the corner of the touch surface.
In the optical touch control system with luminance compensation and its luminance compensation method of the embodiment of the present invention, in the touch-control
Compensatory light is set in addition at the corner or imageing sensor in face with the discontinuous situation of compensation brightness, and the compensatory light
Luminance parameter can set before dispatching from the factory.
Description of the drawings
Figure 1A shows the schematic diagram of known optical touch-control system；
Figure 1B shows the schematic diagram of the Luminance Distribution of the imageing sensor acquired image frame of the optical touch control system of Figure 1A；
Fig. 2A -2D show the schematic diagram of the optical touch control system of the embodiment of the present invention；
Fig. 3 A-3B show the running schematic diagram of the optical touch control system of the embodiment of the present invention, wherein the strip-shaped light source is
Reflecting strips；
Fig. 4 A-4B show the running schematic diagram of the optical touch control system of the embodiment of the present invention, wherein the strip-shaped light source is
Light-emitting section；
Fig. 5 A-5B show the brightness point of the imageing sensor acquired image frame of the optical touch control system of the embodiment of the present invention
The schematic diagram of cloth；
Fig. 6 shows the schematic diagram of the optical touch control system of another embodiment of the present invention；
Fig. 7 A-7B show the schematic diagram of the luminance compensation method of the optical touch control system of Fig. 6.
Description of reference numerals
1st, 2 optical touch control systems 11,21 touch surfaces
The corner of the corner 211-214 touch surfaces of 111-114 touch surfaces
121-124 strip-shaped light source 221-224 strip-shaped light sources
131st, the imageing sensor of 141,151 imageing sensor 231,241,251
132nd, the point source of 142,152 point source 232,242,252
θ1-θ3Field range IF1-IF3Picture frame
B132、B132′、B132' ' brightness B142、B142' brightness
B152、B152' brightness B1-B4Brightness
The touch surface of 9 optical touch control system 91
92nd, the light-emitting section of 92 ' imageing sensor 93
d1-d3Dark areas.
Specific embodiment
In order to above and other purpose, feature and the advantage of the present invention can be become apparent from, will hereafter coordinate appended diagram,
It is described in detail below.In the explanation of the present invention, identical component is to represent that here is illustrated in advance with identical symbol.
Refer to shown in Fig. 2A -2D, it shows showing for the optical touch control system with luminance compensation of the embodiment of the present invention
It is intended to.The optical touch control system 1 of the present embodiment comprising touch surface 11, multiple strip-shaped light source 121-124, multiple images sensor and
Multiple point sources；Wherein, the strip-shaped light source 121-124 is respectively arranged at multiple edges of the touch surface 11.For example, now
The touch surface 11 is shown as rectangle and there is four corner 111-114, the strip-shaped light source 121-124 to be then respectively arranged at institute
State four edge 121-124 of rectangle.It should be noted that, the touch surface 11 be not limited to rectangle and can be polygon for other
Shape；The number of the strip-shaped light source 121-124 is not limited to 4, as long as the field range of each described image sensor is equal
Include strip-shaped light source, have no specific restriction.In the present embodiment, according to different application, the strip-shaped light source 121-124 can
For reflecting strips (i.e. passive light source) or light-emitting section (i.e. active light source), described image sensor is then to obtain across the touch-control
The picture frame in face 11；When object (such as finger or pointer) comes close to or in contact with the touch surface 11, described image sensor
The picture frame that the object blocks the strip-shaped light source 121-124 can then be obtained；Wherein, the image across the touch surface
Frame can be included or the image not comprising the touch surface 11.
When the strip-shaped light source 121-124 is reflecting strips, the point source is simultaneously as system source and supplementary lighting sources；
When the strip-shaped light source 121-124 is light-emitting section, the point source is used as supplementary lighting sources.
Described image sensor for example can for ccd image sensor, cmos image sensor or other to obtain image
The imageing sensor of data, it can be fixed or adjustable sample frequency is sampled.
In the present invention, in order that the not picture frame comprising object image acquired in described image sensor has uniformly
The corner of Luminance Distribution, the adjacent point source setting of each described image sensor and the touch surface 11 is (for example
Even if 111-114) being not provided with imageing sensor may also set up a point source, to the brightness for compensating described image frame
Distribution；Wherein, the adjacent point source of described image sensor refers to that the point source may be disposed at around described image sensor
And the field range of described image sensor is not blocked, such as Fig. 2A -2D show that the point source is disposed on described image biography
The upper limb of sensor, but the present invention is not limited thereto.In the present invention, the point source for example can be a light-emittingdiode or many
The illuminating module that individual light-emittingdiode is rearranged, it preferably sends black light, but is not limited thereto.
For example in Fig. 2A, optical touch control system 1 includes the touch surface 11, the strip-shaped light source 121-124, the first image
Sensor 131, the first point source 132, the second imageing sensor 141, the second point source 142, the 3rd imageing sensor 151 and
Three point sources 152；Wherein, described image sensor 131,141,151 is to obtain the picture frame across the touch surface 11；
First point source 132 adjoins described first image sensor 131 and arranges, and second point source 142 adjoins described second
Imageing sensor 141 is arranged, and the thirdly light source 152 adjoins the 3rd imageing sensor 151 and arranges.In the present embodiment,
Described first image sensor 131 and first point source 132 are arranged at the corner 111 of the touch surface 11, and described second
Imageing sensor 141 and second point source 142 are arranged at the corner 113 of the touch surface 11, the 3rd image sensing
Device 151 and the thirdly light source 152 are arranged at the edge 123 of the touch surface 11.For the purpose of description, second image
Sensor 141 and second point source 142 and the 3rd imageing sensor 151 and the thirdly light source 152 are positions
In field range θ of described first image sensor 1311It is interior；Described first image sensor 131 and first point source
132 is field range θ for being located at second imageing sensor 1412With field range θ of the 3rd imageing sensor 1513
It is interior.
In Fig. 2 B, optical touch control system 1 includes the touch surface 11, the strip-shaped light source 121-124, described first image
Sensor 131, first point source 132, second point source 142, the 3rd imageing sensor 151 and described 3 points
Light source 152.The present embodiment only arranges second point source 142 with the corner 113 that the difference of Fig. 2A is the touch surface 11
And any imageing sensor is not provided with, other elements are then same as Fig. 2A.The present embodiment is to illustrate that corner can only configure one
The embodiment of supplementary lighting sources.
In Fig. 2 C, optical touch control system 1 includes the touch surface 11, the strip-shaped light source 121-124, described first image
Sensor 131, first point source 132, second imageing sensor 141, second point source 142, the described 3rd
Imageing sensor 151 and three point source 152.The present embodiment is described first image sensor 131 with the difference of Fig. 2A
With first point source 132 be located at the touch surface 11 edge 121 rather than the corner 111 positioned at the touch surface 11,
Other elements are then same as Fig. 2A.
In Fig. 2 D, optical touch control system 1 includes the touch surface 11, the strip-shaped light source 121-124, described first image
Sensor 131, first point source 132, second point source 142, the 3rd imageing sensor 151 and described 3 points
Light source 152.The difference of the present embodiment and Fig. 2 B is described first image sensor 131 and first point source 132 is position
In the edge 121 of the touch surface 11 rather than the corner 111 positioned at the touch surface 11, other elements are then same as Fig. 2 B.
Sum it up, in Fig. 2A -2D, described first image sensor 131 and first point source 132 may be disposed at institute
State the edge (such as edge 121) of touch surface 11 or be arranged at the touch surface 11 and be not provided with second point source 142
The corner (such as corner 111) of (or described second imageing sensor 141).Each corner (such as corner of the touch surface 11
113) point source is preferably set and may be selected to arrange or be not provided with imageing sensor according to system design；Namely, although corner 112
With 114 and it is not shown have a light source, if but there is Luminance Distribution not in the picture frame acquired in described image sensor 131-151
Equal situation, also can arrange point source in the corner 112,114.
Hereinafter illustrate the luminance compensation method of the optical touch control system 1 of the embodiment of the present invention.
Referring to shown in Fig. 2A, 2C and 3A, Fig. 3 A show that the running of the optical touch control system 1 of Fig. 2A and 2C is illustrated
Figure；Wherein, described first image sensor 131, second imageing sensor 141 and the 3rd imageing sensor 151 are
Picture frame is obtained successively.In other words, the multiple images sensor that the optical touch control system 1 that the present invention is implemented is included can be successively
Picture frame is obtained, wherein picture frame acquisition can be carried out by single image sensor every time, or multiple images sensor carries out figure simultaneously
As frame is obtained.In the present embodiment, the strip-shaped light source 121-124 be reflecting strips (reflection light bar), the point
Light source 132-152 is to illuminate the reflecting strips to allow the reflecting strips to produce reflected light and simultaneously as supplementary lighting sources.
When described first image sensor 131 obtains the first picture frame IF1Period, in order to compensate second image sensing
The brightness of device 141 and the position of the 3rd imageing sensor 151 is discontinuous, and first point source 132 is with brightness B132Luminous,
Second point source 142 is with brightness B142Light and the thirdly light source 152 is with brightness B152It is luminous, the point source 132-
152 luminosity is adjusted to makes described first image frame IF1With uniform luminance.In a kind of embodiment, the brightness B132Greatly
In the brightness B142With the brightness B152；Wherein, the brightness B142The brightness B can be equal or different to152。
When second imageing sensor 141 obtains the second picture frame IF2Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, and first point source 132 is with brightness B132' luminous and second point source 142 is with bright
Degree B142' luminous；Wherein, the brightness B142' it is more than the brightness B132' so that the second picture frame IF2With uniform bright
Degree.Further, since the 3rd imageing sensor 151 described in Fig. 2A and 2C is not positioned at the visual field of second imageing sensor 141
Range Theta2Interior, the thirdly light source 152 does not light.
When the 3rd imageing sensor 151 obtains the 3rd picture frame IF3Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, and first point source 132 is with brightness B132" light and the thirdly light source 152 is with bright
Degree B152' luminous；Wherein, the brightness B152' it is more than the brightness B132' ' so that the 3rd picture frame IF3With uniform bright
Degree.In the present embodiment, the brightness B132' the brightness B can be equal or different to132′′。
It will be appreciated that when the point source 132-152 is light-emittingdiode, the point source 132-152's sends out
Brightness can be represented with driving current；The bigger then luminosity of driving current is bigger.
Referring to shown in Fig. 2 B, 2D and 3B, Fig. 3 B show that the running of the optical touch control system 1 of Fig. 2 B and 2D is illustrated
Figure；Wherein, the present embodiment is with the difference of Fig. 3 A embodiments, in the optical touch control system 1 of the present embodiment, the touch surface 11
Corner 113 do not include second imageing sensor 141, the only imageing sensor of described first image sensor 131 and the 3rd
151 obtain successively picture frame.
When described first image sensor 131 obtains the first picture frame IF1Period, in order to compensate turning for the touch surface 11
The brightness of angle 113 and the position of the 3rd imageing sensor 151 is discontinuous, and first point source 132 is with brightness B132Luminous,
Second point source 142 is with brightness B142Light and the thirdly light source 152 is with brightness B152It is luminous, the point source 132-
152 luminosity is adjusted to makes described first image frame IF1With uniform luminance.In a kind of embodiment, the brightness B132Greatly
In the brightness B142With the brightness B152；Wherein, the brightness B142The brightness B can be equal or different to152。
When the 3rd imageing sensor 151 obtains the 3rd picture frame IF3Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, and first point source 132 is with brightness B132' ' luminous and thirdly the light source 152 is with bright
Degree B152' luminous；Wherein, the brightness B152' it is more than the brightness B132' ' so that the 3rd picture frame IF3With uniform bright
Degree.In the present embodiment, the brightness B132The brightness B of ' ' preferably less than132；But actual luminosity is then according to adjustment result
Determine.
Referring to shown in Fig. 2A, 2C and 4A, Fig. 4 A show that another running of the optical touch control system 1 of Fig. 2A and 2C is shown
It is intended to.In the same manner, described first image sensor 131, second imageing sensor 141 and the 3rd imageing sensor 151
Picture frame is obtained successively.In the present embodiment, the strip-shaped light source 121-124 is light-emitting section (irradiation light bar)
And can self-luminescence, therefore point source 132-152 described in the present embodiment and be not used to illuminate the strip-shaped light source 121-124 and
It is to carry out luminance compensation.
When described first image sensor 131 obtains the first picture frame IF1Period, in order to compensate second image sensing
The brightness of device 141 and the position of the 3rd imageing sensor 151 is discontinuous, except at least part of light-emitting section (for example herein
It is field range θ positioned at described first image sensor 1311Light-emitting section 122,123) light, second point source 142
Also light so that described first image frame IF with the thirdly light source 1521With uniform luminance；Wherein, the second point light
Source 142 and the thirdly light source 152 can be with identical or different Intensity LEDs.
When second imageing sensor 141 obtains the second picture frame IF2Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, except at least part of light-emitting section (is such as herein positioned at second imageing sensor
141 field range θ2Light-emitting section 121,124) light, first point source 132 also light so that second picture frame
IF2With uniform luminance.
When the 3rd imageing sensor 151 obtains the 3rd picture frame IF3Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, except at least part of light-emitting section (is such as herein positioned at the 3rd imageing sensor
151 field range θ3Light-emitting section 121,122,124) light, first point source 132 also light so that the 3rd figure
As frame IF3With uniform luminance.
Referring to shown in Fig. 2 B, 2D and 4B, Fig. 4 B show that another running of the optical touch control system 1 of Fig. 2 B and 2D is shown
It is intended to；Wherein, the present embodiment is with the difference of Fig. 4 A embodiments, in the optical touch control system 1 of the present embodiment, the touch surface
11 corner 113 does not include second imageing sensor 141.
When described first image sensor 131 obtains the first picture frame IF1Period, in order to compensate turning for the touch surface 11
The brightness of angle 113 and the position of the 3rd imageing sensor 151 is discontinuous, except at least part of light-emitting section (for example herein
It is field range θ positioned at described first image sensor 1311Light-emitting section 122,123) light, second point source 142
Also light so that described first image frame IF with the thirdly light source 1521With uniform luminance；Wherein, the second point light
Source 142 and thirdly light source 152 can be with identical or different Intensity LEDs.
When the 3rd imageing sensor 151 obtains the 3rd picture frame IF3Period, in order to compensate described first image sensing
The brightness of the position of device 131 is discontinuous, except at least part of light-emitting section (is such as herein positioned at the 3rd imageing sensor
151 field range θ3Light-emitting section 121,122,124) light, first point source 132 also light so that the 3rd figure
As frame IF3With uniform luminance.
It will be appreciated that the strip-shaped light source that the field range of each imageing sensor is included be not limited to Fig. 2A-
Shown in 2D.
Refer to shown in Fig. 5 A, it is known that in technology, the corner 113 of the touch surface 11 and the 3rd imageing sensor
There are supplementary lighting sources, such as the first imageing sensor 131 obtains described first image frame described in Fig. 2A -2D at 151
IF1When, the discontinuous feelings of brightness can be formed in the position of corner 113 of the 3rd imageing sensor 151 and the touch surface 11
Shape.Therefore, the present invention is by the corner 113 in the touch surface 11 and the position set-point light of the 3rd imageing sensor 151
Source carries out light filling, to compensate described first image frame IF1Luminance Distribution, as shown in Figure 5 B.Carry out the point source brightness of light filling
Can set in advance.
Therefore, the luminance compensation method of the optical touch control system of the embodiment of the present invention has multiple mode of operations, Mei Yigong
Under operation mode an at least imageing sensor obtain picture frame and positioned at picture frame obtain in imageing sensor within sweep of the eye
Corner or other position of image sensor be provided with light filling with point source to carry out luminance compensation；Wherein, the Working mould
The number of formula and imageing sensor obtain the order of picture frame and are then positioned according to object and followed the trail of depending on used algorithm,
Have no specific restriction.The mode of operation is then performed successively.
Referring for example to shown in Fig. 6, it shows the schematic diagram of the optical touch control system 2 of another embodiment of the present invention, and it is included
Touch surface 21, multiple strip-shaped light source 221-224, multiple images sensor (such as 231,241,251) and multiple point source (examples
Such as 232,242,252).
The optical touch control system 2 of the present embodiment is that image is passed with the difference of the optical touch control system 1 of Fig. 2A -2D embodiments
Sensor is different with the allocation position of point source.In the present embodiment, it is assumed that second imageing sensor 241 and the second point light
Source 242 is located at field range θ of described first image sensor 2311It is interior；Described first image sensor 231 and described first
Point source 232 is located at field range θ of second imageing sensor 2412It is interior；The visual field of the 3rd imageing sensor 251
Range Theta3It is interior not comprising described first image sensor 231 and second imageing sensor 241.It will be appreciated that described
The field range of imageing sensor 231,241,251 can be differed according to different application.
The luminance compensation method of the optical touch control system of the embodiment of the present invention is as included the first mode of operation, the second Working mould
Formula and the 3rd mode of operation are performed successively.The first imageing sensor 231 obtains the first picture frame in first mode of operation
IF1, do not adjoin described first image sensor 231 and positioned at field range θ of described first image sensor1Described light
Source (such as the second point source 242) lights to compensate described first image frame IF1Luminance Distribution (as shown in Figure 5 A and 5B)；Institute
State the second imageing sensor 241 in the second mode of operation and obtain the second picture frame IF2, do not adjoin second imageing sensor
241 and positioned at field range θ of second imageing sensor2The point source (such as the first point source 232) it is luminous with
Compensate the second picture frame IF2Luminance Distribution；The 3rd imageing sensor 251 obtains the 3rd figure in 3rd mode of operation
As frame IF3, due to now not there is other imageing sensors to be located at field range θ of the 3rd imageing sensor3It is interior, therefore
Light filling need not be carried out；If however, the corner 214 of the touch surface 21 is additionally provided with supplementary lighting sources, when the 3rd image
Sensor 251 obtains the 3rd picture frame IF3When (under the 3rd mode of operation), positioned at the corner 214 of the touch surface 21
Supplementary lighting sources then light to compensate the 3rd picture frame IF3Luminance Distribution.Additionally, the figure operated in each mode of operation
As number of sensors is not limited to 1.
Refer to shown in Fig. 7 A, the schematic diagram of the luminance compensation method of the optical touch control system 2 of its display Fig. 6, and now
Assume that the strip-shaped light source 221-224 is reflecting strips.In the present embodiment, pass with described first image in first mode of operation
The adjacent point source 232 of sensor 231 is with not adjacent described first image sensor 231 and positioned at described first image sensing
Field range θ of device1The point source (such as point source 242) with different Intensity LEDs, such as brightness is respectively B1And B2；
The point source 242 adjoined with second imageing sensor 241 in second mode of operation and not adjacent described second
Imageing sensor 241 and positioned at field range θ of second imageing sensor2The point source (such as point source 232)
With different Intensity LEDs, such as brightness is respectively B4And B3；In 3rd mode of operation only with the 3rd imageing sensor
The 251 adjacent point sources 252 light.
Refer to shown in Fig. 7 B, it shows another schematic diagram of the luminance compensation method of the optical touch control system 2 of Fig. 6, and
It is assumed that the strip-shaped light source 221-224 is light-emitting section.In the present embodiment, with first figure in first mode of operation
Described first image sensor 231 is not adjoined as the point source 232 that sensor 231 is adjoined does not light and positioned at described the
Field range θ of one imageing sensor1The point source (such as point source 242) light, and now at least part is described sends out
Rhizoma Dioscoreae (peeled) lights (being for example shown here as 222,223)；It is adjacent with second imageing sensor 241 in second mode of operation
The point source 242 do not light and do not adjoin second imageing sensor 241 and positioned at second imageing sensor
Field range θ2The point source (such as point source 232) light, and now at least the part light-emitting section it is luminous (for example this
Place is shown as 221,224)；Supplementary lighting sources 232,242,252 do not light described in 3rd mode of operation, and now at least
Partly the light-emitting section is luminous (such as being shown here as 223,224).
Although imageing sensor described in Fig. 6 and the point source show the corner positioned at the touch surface 21, this
Invention is not limited thereto, and described image sensor and its adjacent point source may also set up in the edge of the touch surface 21
221-224。
In various embodiments of the present invention, the sampling time (sampling period) of described image sensor, the point source
Fluorescent lifetime (radiation period) and the fluorescent lifetime of the light-emitting section can select equal or not according to different application
It is equal, have no specific restriction.
Additionally, when the number of light sources of the point source is more than the number of sensors of described image sensor, not adjoining described
The point source of imageing sensor is arranged at the corner of the touch surface, discontinuous to the brightness for compensating angle position.
Additionally, heretofore described supplementary lighting sources are not limited to point source, the active light sources such as line source are also may be selected, its
The shape of dark areas that can in advance in picture frame has no specific restriction designing.
In the various embodiments described above, described image sensor, the number of the point source and the strip-shaped light source and setting position
Put only exemplary, it can design according to different system and determine, however it is not limited to disclosed person.The point source and institute
State light-emitting section luminosity (or driving current) can before dispatching from the factory in advance adjustment correct and be stored in memory element.
It should be noted that, in Fig. 2A -2D and 6, though described image sensor, the point source and strip-shaped light source figure
It is shown as being arranged on the surface of the touch surface 11 or touch surface 21, but it is not limited to the present invention；Described image is sensed
Device, the point source and the strip-shaped light source for example can be set up in the touch surface 11 or touch surface by support or other elements
21 tops or outer rim, however it is not limited to illustrated.
It should be noted that, although in the explanation of the various embodiments described above, picture frame compensation is uniform luminance by compensatory light,
But the present invention is not limited thereto.According to different application, it is with certain luminance point that compensatory light may be used to picture frame compensation
Cloth and non-uniform Distribution.
In sum, it is known that optical touch control system causes brightness in picture frame because of touch surface corner or position of image sensor
Skewness, thus the situation judged by accident may be caused.The present invention separately propose a kind of optical touch control system (Fig. 2A -2D and 6) and
Its luminance compensation method (Fig. 3 A-3B, 4A-4B and 7A-7B), its utilisation system light source or extra supplementary lighting sources compensation image are passed
The uneven situation of Luminance Distribution in sensor acquired image frame, to avoid judging the position of touch of object by accident.
Although the present invention with previous embodiment by being disclosed, it is not limited to the present invention, any institute of the present invention
Category technical field in have usual knowledge technology personnel, without departing from the spirit and scope of the present invention, when can make it is various more
Dynamic and modification.Therefore protection scope of the present invention is worked as and is defined depending on appended claims scope institute confining spectrum.
Claims (20)
1. a kind of optical touch control system, the optical touch control system is included：
Touch surface；
Multiple reflecting strips, are respectively arranged at multiple edges of the touch surface；
First imageing sensor, to obtain the picture frame across the touch surface；
First active light source, adjoins described first image sensor and arranges；And
Second active light source, is arranged at the corner of the touch surface and is located at described first image sensor within sweep of the eye；
Wherein during described first image sensor obtains the first picture frame, first active light source is with the first Intensity LEDs
And second active light source, with the second Intensity LEDs, first brightness is more than second brightness, and second brightness
It is set as making the brightness of the position of relatively described corner in described first image frame elevated to compensate described first image frame
Luminance Distribution is uniform.
2. optical touch control system according to claim 1, is provided with the touch surface of second active light source
The corner be additionally provided with to obtain the second imageing sensor of the picture frame across the touch surface.
3. optical touch control system according to claim 1 and 2, wherein described first image sensor and described first are actively
Light source be arranged at the edge of the touch surface or be arranged at the touch surface be not provided with second active light source turn
Angle.
4. optical touch control system according to claim 2, wherein described first image sensor and first active light
Source is located at second imageing sensor within sweep of the eye, during second imageing sensor obtains the second picture frame,
First active light source is with the 3rd Intensity LEDs and second active light source is with the 4th Intensity LEDs, and the 4th brightness is big
In the 3rd brightness.
5. optical touch control system according to claim 4, wherein described first image sensor and first active light
Source is arranged at the edge of the touch surface or is arranged at the corner for being not provided with second active light source of the touch surface.
6. optical touch control system according to claim 1 and 2, the optical touch control system also comprising the 3rd imageing sensor and
3rd active light source, the 3rd imageing sensor and the 3rd active light source are arranged at adjacent to one another the touch surface
The edge and positioned at described in described first image sensor within sweep of the eye, wherein described first image sensor obtain
During described first image frame, first active light source is with first Intensity LEDs and the 3rd active light source is with the 5th
Intensity LEDs, first brightness is more than the 5th brightness.
7. optical touch control system according to claim 6, wherein described first image sensor and first active light
Source is arranged at the edge of the touch surface or is arranged at the corner for being not provided with second active light source of the touch surface.
8. optical touch control system according to claim 6, wherein second brightness is bright equal or different to the described 5th
Degree.
9. a kind of optical touch control system, the optical touch control system is included：
Touch surface；
Multiple light-emitting sections, are respectively arranged at multiple edges of the touch surface；
First imageing sensor, to obtain the picture frame across the touch surface；And
Active light source, is arranged at the corner of the touch surface and is located at described first image sensor within sweep of the eye；
Wherein during described first image sensor obtains the first picture frame, at least partly light-emitting section and the active light
Source lights, and the luminosity of the active light source is set as making the bright of the position of relatively described corner in described first image frame
The elevated Luminance Distribution to compensate described first image frame of degree is uniform.
10. optical touch control system according to claim 9, is provided with the institute of the touch surface of the active light source
State corner to be additionally provided with to obtain the second imageing sensor of the picture frame across the touch surface.
11. optical touch control systems according to claim 9 or 10, wherein described first image sensor are arranged at described touching
The edge in control face is arranged at the corner for being not provided with the active light source of the touch surface.
12. optical touch control systems according to claim 10, the optical touch control system is also comprising adjacent described first image
The first active light source that sensor is arranged, wherein described first image sensor and first active light source are located at described second
Imageing sensor is within sweep of the eye, at least partly described to send out during second imageing sensor obtains the second picture frame
Rhizoma Dioscoreae (peeled) and first active light source are luminous.
13. optical touch control systems according to claim 12, wherein described first image sensor and described first are actively
Light source is arranged at the edge of the touch surface or is arranged at the corner for being not provided with the active light source of the touch surface.
14. optical touch control systems according to claim 9 or 10, the optical touch control system also includes the 3rd imageing sensor
With the 3rd active light source, the 3rd imageing sensor and the 3rd active light source are arranged at adjacent to one another the touch surface
The edge and positioned at described in described first image sensor within sweep of the eye, wherein obtaining in described first image sensor
During taking described first image frame, the 3rd active light source lights.
15. optical touch control systems according to claim 14, wherein described first image sensor are arranged at the touch-control
The edge in face is arranged at the corner for being not provided with the active light source of the touch surface.
A kind of 16. luminance compensation methods of optical touch control system, the optical touch control system includes touch surface, multiple strip light
Source, multiple images sensor and multiple active light sources, and each described image sensor adjoins an active light source, institute
State luminance compensation method to include：
First mode of operation, in first mode of operation, the first imageing sensor obtains the first picture frame, does not adjoin described
First imageing sensor and positioned at described first image sensor within the vision described active light source with the first brightness send out
Light with compensating the Luminance Distribution of described first image frame, and first brightness settings to make described first image frame with institute
State the luminance raising of the position of the adjacent imageing sensor of the active light source of the first Intensity LEDs；And
Second mode of operation, in second mode of operation, the second imageing sensor obtains the second picture frame, does not adjoin described
Second imageing sensor and positioned at second imageing sensor within the vision described active light source with the second brightness send out
Light with compensating the Luminance Distribution of second picture frame, and second brightness settings to make second picture frame with institute
State the luminance raising of the position of the adjacent imageing sensor of the active light source of the second Intensity LEDs；
Wherein described first mode of operation and second mode of operation are performed successively.
17. luminance compensation methods according to claim 16, wherein the strip-shaped light source is reflecting strips, first work
The active light source adjoined with described first image sensor in pattern is with not adjacent described first image sensor and is located at
The active light source described within the vision of described first image sensor is with different Intensity LEDs；Second Working mould
The active light source adjoined with second imageing sensor in formula is with not adjacent second imageing sensor and positioned at institute
The active light source described within the vision of the second imageing sensor is stated with different Intensity LEDs.
18. luminance compensation methods according to claim 16, wherein the strip-shaped light source is light-emitting section, first work
The active light source adjoined with described first image sensor in pattern does not light and does not adjoin described first image sensor
And the active light source described within the vision positioned at described first image sensor lights；In second mode of operation
The active light source adjoined with second imageing sensor does not light and does not adjoin second imageing sensor and be located at
The active light source described within the vision of second imageing sensor lights.
19. luminance compensation methods according to any one of claim 16-18 claim, wherein described image sensor
And the active light source adjoined with the imageing sensor is arranged at the edge or corner of the touch surface.
20. luminance compensation methods according to any one of claim 16-18 claim, wherein the active light source
Number of light sources is arranged more than the number of sensors of described image sensor, the active light source for not adjoining described image sensor
In the corner of the touch surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210428550.4A CN103793104B (en) | 2012-10-31 | 2012-10-31 | Optical touch system with luminance compensation function and method for compensating for luminance of optical touch system |
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| CN201210428550.4A CN103793104B (en) | 2012-10-31 | 2012-10-31 | Optical touch system with luminance compensation function and method for compensating for luminance of optical touch system |
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| CN108038444A (en) * | 2017-12-11 | 2018-05-15 | 北京小米移动软件有限公司 | Image-recognizing method and device |
| JP7439243B2 (en) * | 2019-09-05 | 2024-02-27 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Viewer synchronized lighting detection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201117065A (en) * | 2009-11-04 | 2011-05-16 | Coretronic Corp | Optical touch apparatus and driving mothod |
| CN102063220A (en) * | 2009-11-13 | 2011-05-18 | 广达电脑股份有限公司 | Optical touch module |
| TW201120710A (en) * | 2009-12-15 | 2011-06-16 | Lg Display Co Ltd | Optical sensing unit, display module and display device using the same |
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| TWI397847B (en) * | 2009-09-17 | 2013-06-01 | Pixart Imaging Inc | Optical touch device and locating method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201117065A (en) * | 2009-11-04 | 2011-05-16 | Coretronic Corp | Optical touch apparatus and driving mothod |
| CN102063220A (en) * | 2009-11-13 | 2011-05-18 | 广达电脑股份有限公司 | Optical touch module |
| TW201120710A (en) * | 2009-12-15 | 2011-06-16 | Lg Display Co Ltd | Optical sensing unit, display module and display device using the same |
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