CN103793104A - 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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- CN103793104A CN103793104A CN201210428550.4A CN201210428550A CN103793104A CN 103793104 A CN103793104 A CN 103793104A CN 201210428550 A CN201210428550 A CN 201210428550A CN 103793104 A CN103793104 A CN 103793104A
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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 invention relates to a kind of optical touch control system, particularly about a kind of optical touch control system and its luminance compensation method with luminance compensation.
Background technology
Multiple picture frames that optical touch control system utilizes imageing sensor to obtain to comprise touch surface image conventionally, and carry out object tracking according to the change in location of finger-image in described picture frame.
For example, with reference to shown in Figure 1A, it shows the schematic diagram of known optical touch-control system 9, and it comprises a touch surface 91, two imageing sensors 92,92 ' and multiple light-emitting section 93.In the time of described imageing sensor 92,92 ' obtain image, the luminous so that described imageing sensor 92,92 of described light-emitting section 93 ' the receive light of described light-emitting section 93.Whereby, in the time that finger (not shown) contacts described touch surface 91, described imageing sensor 92,92 ' can obtain comprises described finger and interdicts the picture frame of the dark areas that described light-emitting section 93 forms, and processing unit (not shown) can judge described finger position according to described picture frame.
But, described touch surface 91 corners cause brightness discontinuous because of the angle that arranges of described light-emitting section 93, cause also can causing the picture frame Luminance Distribution of described imageing sensor 92,92 ' obtain inhomogeneous even without touch surface described in finger contact 91, for example, have the three dark areas d of place shown in Figure 1B
1-d
3.Therefore,, in the time that described processing unit carries out image processing, may cause judging by accident the situation of finger position.
In view of this, the present invention also proposes a kind of optical touch control system and its luminance compensation method with luminance compensation, and it can adjust imageing sensor and obtain roughly uniform picture frame of Luminance Distribution before dispatching from the factory.
Summary of the invention
Object of the present invention is providing a kind of optical touch control system and its luminance compensation method with luminance compensation, and it utilizes the dark areas in compensatory light compensation image picture frame, so that imageing sensor obtains roughly uniform picture frame of Luminance Distribution.
Another object of the present invention is providing a kind of optical touch control system with luminance compensation and its luminance compensation method, its utilisation system light source or supplementary lighting sources is set in addition to carry out dark areas compensation.
The invention provides a kind of optical touch control system, comprise touch surface, multiple reflecting strips, the first imageing sensor, the first active light source and the second active light source.Described reflecting strips is arranged at respectively multiple edges of described touch surface.Described the first imageing sensor is in order to obtain the picture frame across described touch surface.Described the first active light source is in abutting connection with described the first imageing sensor setting.Described the second active light source is arranged at the corner of described touch surface and is positioned at described the first imageing sensor within sweep of the eye; Wherein, during described the first imageing sensor obtains the first picture frame, described the first active light source is luminous and described the second active light source is luminous with the second brightness with the first brightness, and described the first brightness is greater than described the second brightness, to compensate the Luminance Distribution of described the first picture frame.
The present invention also provides a kind of optical touch control system, comprises touch surface, multiple light-emitting section, the first imageing sensor and active light source.Described light-emitting section is arranged at respectively multiple edges of described touch surface.Described the first imageing sensor is in order to obtain the picture frame across described touch surface.Described active light source is arranged at the corner of described touch surface and is positioned at described the first imageing sensor within sweep of the eye; Wherein, during described the first imageing sensor obtains the first picture frame, at least part of described light-emitting section is luminous and described active light source is luminous, to compensate the Luminance Distribution of described the first picture frame.
In one embodiment, the described corner that is provided with the described touch surface of described active light source can separately arrange the second imageing sensor in order to obtain the picture frame across described touch surface.
In one embodiment, can also comprise the first active light source in abutting connection with described the first imageing sensor setting; Described the first imageing sensor and described the first active light source are arranged at the described edge of described touch surface or are arranged at described touch surface the corner that described active light source is not set.
In the present embodiment, described active light source and described the first active light source for example can be pointolite, and it is used as compensatory light.
The present invention also provides a kind of luminance compensation method of optical touch control system, and described optical touch control system comprises touch surface, multiple strip-shaped light source, multiple imageing sensor and multiple active light source, and a described active light source of imageing sensor adjacency described in each.Described luminance compensation method comprises the first mode of operation and the second mode of operation is performed successively.In described the first mode of operation, the first imageing sensor obtains the first picture frame, not in abutting connection with described the first imageing sensor and to be positioned at the described active light source of field range of described the first imageing sensor luminous to compensate the Luminance Distribution of described the first picture frame.In described the second mode of operation, the second imageing sensor obtains the second picture frame, not in abutting connection with described the second imageing sensor and to be positioned at the described active light source of field range of described the second imageing sensor luminous to compensate the Luminance Distribution of described the second picture frame.
In one embodiment, described strip-shaped light source is reflecting strips.In described the first mode of operation from the described active light source of described the first imageing sensor adjacency with not in abutting connection with described the first imageing sensor and to be positioned at the described active light source of field range of described the first imageing sensor luminous with different brightness; In described the second mode of operation from the described active light source of described the second imageing sensor adjacency with not in abutting connection with described the second imageing sensor and to be positioned at the described active light source of field range of described the second imageing sensor luminous with different brightness.
In one embodiment, described strip-shaped light source is light-emitting section.Not luminous and not in abutting connection with described the first imageing sensor and to be positioned at the described active light source of described field range of described the first imageing sensor luminous with the described active light source of described the first imageing sensor adjacency in described the first mode of operation; Not luminous and not in abutting connection with described the second imageing sensor and to be positioned at the described active light source of described field range of described the second imageing sensor luminous with the described active light source of described the second imageing sensor adjacency in described the second mode of operation.
In one embodiment, the active light source of described imageing sensor and its adjacency can be arranged at edge or the corner of described touch surface.
In one embodiment, in the time that the number of light sources of described active light source is greater than the number of sensors of described imageing sensor, be not arranged at the corner of described touch surface in abutting connection with the described active light source of described imageing sensor.
In the optical touch control system with luminance compensation of the embodiment of the present invention and its luminance compensation method, corner or imageing sensor place in described touch surface arrange compensatory light in addition with the discontinuous situation of compensate for brightness, and the luminance parameter of described compensatory light can be set before dispatching from the factory.
Accompanying drawing explanation
Figure 1A shows the schematic diagram of known optical touch-control system;
Figure 1B shows the schematic diagram of the Luminance Distribution of the picture frame that imageing sensor obtains of the optical touch control system of Figure 1A;
Fig. 2 A-2D shows the schematic diagram of the optical touch control system of the embodiment of the present invention;
Fig. 3 A-3B shows the running schematic diagram of the optical touch control system of the embodiment of the present invention, and wherein said strip-shaped light source is reflecting strips;
Fig. 4 A-4B shows the running schematic diagram of the optical touch control system of the embodiment of the present invention, and wherein said strip-shaped light source is light-emitting section;
Fig. 5 A-5B shows the schematic diagram of the Luminance Distribution of the picture frame that imageing sensor obtains of the optical touch control system of the embodiment of the present invention;
Fig. 6 shows the schematic diagram of the optical touch control system of another embodiment of the present invention;
Fig. 7 A-7B shows the schematic diagram of the luminance compensation method of the optical touch control system of Fig. 6.
Description of reference numerals
1,2 optical touch control system 11,21 touch surface
The corner of the corner 211-214 touch surface of 111-114 touch surface
121-124 strip-shaped light source 221-224 strip-shaped light source
131,141,151 imageing sensor 231,241,251 imageing sensors
132,142,152 pointolite 232,242,252 pointolites
θ
1-θ
3field range IF
1-IF
3picture frame
B
132, B
132', B
132' ' brightness B
142, B
142' brightness
B
152, B
152' brightness B
1-B
4brightness
9 optical touch control system 91 touch surface
92,92 ' imageing sensor, 93 light-emitting sections
D
1-d
3dark areas.
Embodiment
In order to allow above and other object of the present invention, feature and the advantage can be more obvious, below will coordinate appended diagram, be described in detail below.In explanation of the present invention, identical member is to represent with identical symbol, illustrates in advance at this.
Please refer to shown in Fig. 2 A-2D, it shows the schematic diagram of the optical touch control system with luminance compensation of the embodiment of the present invention.The optical touch control system 1 of the present embodiment comprises touch surface 11, multiple strip-shaped light source 121-124, multiple imageing sensor and multiple pointolite; Wherein, described strip-shaped light source 121-124 is arranged at respectively multiple edges of described touch surface 11.For example, now described touch surface 11 is shown as rectangle and has four corner 111-114, and described strip-shaped light source 121-124 is arranged at respectively four edge 121-124 of described rectangle.Should be noted that, described touch surface 11 is not defined as rectangle and can be other polygons; The number of described strip-shaped light source 121-124 is not defined as 4, as long as the field range of imageing sensor all includes strip-shaped light source described in each, there is no specific limited.In the present embodiment, according to different application, described strip-shaped light source 121-124 can be reflecting strips (being passive light source) or light-emitting section (being active light source), and described imageing sensor is in order to obtain the picture frame across described touch surface 11; For example, in the time that object (finger or pointer) comes close to or in contact with described touch surface 11, described imageing sensor can obtain described object and block the picture frame of described strip-shaped light source 121-124; Wherein, the described picture frame across described touch surface can comprise or not comprise the image of described touch surface 11.
In the time that described strip-shaped light source 121-124 is reflecting strips, described pointolite is simultaneously as system source and supplementary lighting sources; In the time that described strip-shaped light source 121-124 is light-emitting section, described pointolite is as supplementary lighting sources.
Described imageing sensor for example can be ccd image sensor, cmos image sensor or other in order to obtain the imageing sensor of image document, and it can be fixed or adjustable sample frequency is sampled.
In the present invention, in order to make the picture frame that does not comprise object image that described imageing sensor obtains there is uniform Luminance Distribution, described in each, imageing sensor all for example, also can arrange a described pointolite in abutting connection with the corner (111-114) of a described pointolite setting and described touch surface 11 even without imageing sensor is set, in order to compensate the Luminance Distribution of described picture frame; Wherein, described imageing sensor abutment points light source refers to the field range that described pointolite can be arranged at the surrounding of described imageing sensor and not block described imageing sensor, for example Fig. 2 A-2D shows that described pointolite is the upper limb that is arranged at described imageing sensor, but the present invention is not as limit.In the present invention, described pointolite for example can be the illuminating module that a light-emittingdiode or multiple light-emittingdiode rearrange, its better invisible light that sends, but not as limit.
For example, in Fig. 2 A, optical touch control system 1 comprises described touch surface 11, described strip-shaped light source 121-124, the first imageing sensor 131, the first pointolite 132, the second imageing sensor 141, second point light source 142, the 3rd imageing sensor 151 and light source 152 thirdly; Wherein, described imageing sensor 131,141,151 is all in order to obtain the picture frame across described touch surface 11; Described the first pointolite 132 arranges in abutting connection with described the first imageing sensor 131, and described second point light source 142 arranges in abutting connection with described the second imageing sensor 141, and described thirdly light source 152 arranges in abutting connection with described the 3rd imageing sensor 151.In the present embodiment, described the first imageing sensor 131 and described the first pointolite 132 are arranged at the corner 111 of described touch surface 11, described the second imageing sensor 141 and described second point light source 142 are arranged at the corner 113 of described touch surface 11, and described the 3rd imageing sensor 151 and described thirdly light source 152 are arranged at the edge 123 of described touch surface 11.For the purpose of description, described the second imageing sensor 141 and described second point light source 142 and described the 3rd imageing sensor 151 and described thirdly light source 152 are the field range θ 1 that are positioned at described the first imageing sensor 131; Described the first imageing sensor 131 and described the first pointolite 132 are to be positioned at the field range θ 2 of described the second imageing sensor 141 and the field range θ 3 of described the 3rd imageing sensor 151.
In Fig. 2 B, optical touch control system 1 comprises described touch surface 11, described strip-shaped light source 121-124, described the first imageing sensor 131, described the first pointolite 132, described second point light source 142, described the 3rd imageing sensor 151 and described three pointolites 152.The difference of the present embodiment and Fig. 2 A is that the corner 113 of described touch surface 11 only arranges described second point light source 142 and any imageing sensor is not set, and other elements are same as Fig. 2 A.The present embodiment is to illustrate that corner can only configure the embodiment of a supplementary lighting sources.
In Fig. 2 C, optical touch control system 1 comprises described touch surface 11, described strip-shaped light source 121-124, described the first imageing sensor 131, described the first pointolite 132, described the second imageing sensor 141, described second point light source 142, described the 3rd imageing sensor 151 and described three pointolites 152.The difference of the present embodiment and Fig. 2 A is that described the first imageing sensor 131 and described the first pointolite 132 are to be positioned at the edge 121 of described touch surface 11 but not the corner 111 that is positioned at described touch surface 11, and other elements are same as Fig. 2 A.
In Fig. 2 D, optical touch control system 1 comprises described touch surface 11, described strip-shaped light source 121-124, described the first imageing sensor 131, described the first pointolite 132, described second point light source 142, described the 3rd imageing sensor 151 and described three pointolites 152.The difference of the present embodiment and Fig. 2 B is that described the first imageing sensor 131 and described the first pointolite 132 are to be positioned at the edge 121 of described touch surface 11 but not the corner 111 that is positioned at described touch surface 11, and other elements are same as Fig. 2 B.
Generally speaking, in Fig. 2 A-2D, described the first imageing sensor 131 and described the first pointolite 132 can be arranged at the described edge (for example edge 121) of described touch surface 11 or be arranged at described touch surface 11 described second point light source 142(or described the second imageing sensor 141 are not set) corner (for example corner 111).Each corner (for example corner 113) better set-point light source of described touch surface 11 also can select to arrange or do not arrange imageing sensor according to system; Also, although corner 112 and 114 not shownly have a light source, if but there is the situation of Luminance Distribution inequality in the picture frame that described imageing sensor 131-151 obtains, also can be in described corner 112,114 set-point light sources.
The luminance compensation method of the optical touch control system 1 of the embodiment of the present invention is below described.
Shown in Fig. 2 A, 2C and 3A, Fig. 3 A shows the running schematic diagram of the optical touch control system 1 of Fig. 2 A and 2C; Wherein, described the first imageing sensor 131, described the second imageing sensor 141 and described the 3rd imageing sensor 151 are to obtain successively picture frame.In other words, multiple imageing sensors that optical touch control system 1 of the invention process comprises can obtain picture frame successively, and wherein single image sensor carries out picture frame and obtains at every turn, or multiple imageing sensor carries out picture frame simultaneously and obtains.In the present embodiment, described strip-shaped light source 121-124 is reflecting strips (reflection light bar), described pointolite 132-152 in order to the described reflecting strips of throwing light on to allow described reflecting strips produce reflected light and simultaneously as supplementary lighting sources.
When described the first imageing sensor 131 obtains the first picture frame IF
1during this time, discontinuous in order to compensate the brightness of described the second imageing sensor 141 and described the 3rd imageing sensor 151 positions, described the first pointolite 132 is with brightness B
132luminous, described second point light source 142 is with brightness B
142luminous and described thirdly light source 152 is with brightness B
152luminous, the luminosity of described pointolite 132-152 is adjusted into and makes described the first picture frame IF
1there is uniform luminance.In a kind of embodiment, described brightness B
132be greater than described brightness B
142with described brightness B
152; Wherein, described brightness B
142can equal or be not equal to described brightness B
152.
When described the second imageing sensor 141 obtains the second picture frame IF
2during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, described the first pointolite 132 is with brightness B
132' luminous and described second point light source 142 is with brightness B
142' luminous; Wherein, described brightness B
142' be greater than described brightness B
132' so that described the second picture frame IF
2there is uniform luminance.In addition, because the 3rd imageing sensor 151 described in Fig. 2 A and 2C is not positioned at the field range θ of described the second imageing sensor 141
2in, described thirdly light source 152 is not luminous.
When described the 3rd imageing sensor 151 obtains the 3rd picture frame IF
3during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, described the first pointolite 132 is with brightness B
132' ' luminous and described thirdly light source 152 are with brightness B
152' luminous; Wherein, described brightness B
152' be greater than described brightness B
132' ' so that described the 3rd picture frame IF
3there is uniform luminance.In the present embodiment, described brightness B
132' can equal or be not equal to described brightness B
132' '.
Scrutable, in the time that described pointolite 132-152 is light-emittingdiode, the luminosity of described pointolite 132-152 can represent by drive current; Drive current more luminosity is larger.
Shown in Fig. 2 B, 2D and 3B, Fig. 3 B shows the running schematic diagram of the optical touch control system 1 of Fig. 2 B and 2D; Wherein, the difference of the present embodiment and Fig. 3 A embodiment is, in the optical touch control system 1 of the present embodiment, the corner 113 of described touch surface 11 does not comprise described the second imageing sensor 141, and only described the first imageing sensor 131 and the 3rd imageing sensor 151 obtain picture frame successively.
When described the first imageing sensor 131 obtains the first picture frame IF
1during this time, in order to compensate the corner 113 of described touch surface 11 and the brightness of described the 3rd imageing sensor 151 positions is discontinuous, described the first pointolite 132 is with brightness B
132luminous, described second point light source 142 is with brightness B
142luminous and described thirdly light source 152 is with brightness B
152luminous, the luminosity of described pointolite 132-152 is adjusted into and makes described the first picture frame IF
1there is uniform luminance.In a kind of embodiment, described brightness B
132be greater than described brightness B
142with described brightness B
152; Wherein, described brightness B
142can equal or be not equal to described brightness B
152.
When described the 3rd imageing sensor 151 obtains the 3rd picture frame IF
3during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, described the first pointolite 132 is with brightness B
132' ' luminous and described thirdly light source 152 are with brightness B
152' luminous; Wherein, described brightness B
152' be greater than described brightness B
132' ' so that described the 3rd picture frame IF
3there is uniform luminance.In the present embodiment, described brightness B
132' ' better is less than described brightness B
132; But actual luminosity determines according to adjusting result.
Shown in Fig. 2 A, 2C and 4A, Fig. 4 A shows another running schematic diagram of the optical touch control system 1 of Fig. 2 A and 2C.In like manner, described the first imageing sensor 131, described the second imageing sensor 141 and described the 3rd imageing sensor 151 obtain picture frame successively.In the present embodiment, described strip-shaped light source 121-124 is light-emitting section (irradiation light bar) and can self-luminescence, and therefore the 132-152 of pointolite described in the present embodiment is not in order to throw light on described strip-shaped light source 121-124 but in order to carry out luminance compensation.
When described the first imageing sensor 131 obtains the first picture frame IF
1during this time, discontinuous in order to compensate the brightness of described the second imageing sensor 141 and described the 3rd imageing sensor 151 positions, except at least part of described light-emitting section is (for example, herein for being positioned at the field range θ of described the first imageing sensor 131
1light-emitting section 122,123) luminous, described second point light source 142 and described thirdly light source 152 are also luminous so that described the first picture frame IF
1there is uniform luminance; Wherein, described second point light source 142 and described thirdly light source 152 are can identical or different brightness luminous.
When described the second imageing sensor 141 obtains the second picture frame IF
2during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, except at least part of described light-emitting section is (for example, herein for being positioned at the field range θ of described the second imageing sensor 141
2light-emitting section 121,124) luminous, described the first pointolite 132 is also luminous so that described the second picture frame IF
2there is uniform luminance.
When described the 3rd imageing sensor 151 obtains the 3rd picture frame IF
3during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, except at least part of described light-emitting section is (for example, herein for being positioned at the field range θ of described the 3rd imageing sensor 151
3light-emitting section 121,122,124) luminous, described the first pointolite 132 is also luminous so that described the 3rd picture frame IF
3there is uniform luminance.
Shown in Fig. 2 B, 2D and 4B, Fig. 4 B shows another running schematic diagram of the optical touch control system 1 of Fig. 2 B and 2D; Wherein, the difference of the present embodiment and Fig. 4 A embodiment is, in the optical touch control system 1 of the present embodiment, the corner 113 of described touch surface 11 does not comprise described the second imageing sensor 141.
When described the first imageing sensor 131 obtains the first picture frame IF
1during this time, in order to compensate the corner 113 of described touch surface 11 and the brightness of described the 3rd imageing sensor 151 positions is discontinuous, except at least part of described light-emitting section is (for example, herein for being positioned at the field range θ of described the first imageing sensor 131
1light-emitting section 122,123) luminous, described second point light source 142 and described thirdly light source 152 are also luminous so that described the first picture frame IF
1there is uniform luminance; Wherein, described second point light source 142 and thirdly light source 152 is can identical or different brightness luminous.
When described the 3rd imageing sensor 151 obtains the 3rd picture frame IF
3during this time, discontinuous in order to compensate the brightness of described the first imageing sensor 131 positions, except at least part of described light-emitting section is (for example, herein for being positioned at the field range θ of described the 3rd imageing sensor 151
3light-emitting section 121,122,124) luminous, described the first pointolite 132 is also luminous so that described the 3rd picture frame IF
3there is uniform luminance.
Scrutable, the strip-shaped light source that the field range of each imageing sensor comprises is not defined as shown in Fig. 2 A-2D.
Please refer to shown in Fig. 5 A, in known technology, the corner 113 of described touch surface 11 and described the 3rd imageing sensor 151 places do not have supplementary lighting sources, for example, when the first imageing sensor 131 described in Fig. 2 A-2D obtains described the first picture frame IF
1time, can form the discontinuous situation of brightness in the corner of described the 3rd imageing sensor 151 and described touch surface 11 113 positions.Therefore, the present invention carries out light filling by the corner 113 in described touch surface 11 and described the 3rd imageing sensor 151 set-point, position light sources, to compensate described the first picture frame IF
1luminance Distribution, as shown in Figure 5 B.Carrying out the pointolite 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, and under each mode of operation, at least one imageing sensor obtains picture frame and is arranged in the corner within the vision of the imageing sensor that picture frame obtains or other position of image sensors are provided with pointolite that light filling uses to carry out luminance compensation; Wherein, the number of described mode of operation and imageing sensor obtain the order of picture frame and locate according to object and follow the trail of the algorithm using and determine, and there is no specific limited.Described mode of operation is performed successively.
For example, with reference to shown in Fig. 6, it shows the schematic diagram of optical touch control system 2 of another embodiment of the present invention, and it comprises touch surface 21, multiple strip-shaped light source 221-224, multiple imageing sensor (for example 231,241,251) and multiple pointolite (for example 232,242,252).
The optical touch control system 2 of the present embodiment is that from the difference of the optical touch control system 1 of Fig. 2 A-2D embodiment the allocation position of imageing sensor and pointolite is different.In the present embodiment, suppose that described the second imageing sensor 241 and described second point light source 242 are positioned at the field range θ of described the first imageing sensor 231
1in; Described the first imageing sensor 231 and described the first pointolite 232 are positioned at the field range θ of described the second imageing sensor 241
2in; The field range θ of described the 3rd imageing sensor 251
3inside do not comprise described the first imageing sensor 231 and described the second imageing sensor 241.Scrutable, the field range of described imageing sensor 231,241,251 can be not identical according to different application.
The luminance compensation method of the optical touch control system of the embodiment of the present invention is performed successively as comprised the first mode of operation, the second mode of operation and the 3rd mode of operation.In described the first mode of operation, the first imageing sensor 231 obtains the first picture frame IF
1, not in abutting connection with described the first imageing sensor 231 and be positioned at the field range θ of described the first imageing sensor
1described pointolite (for example second point light source 242) luminous to compensate described the first picture frame IF
1luminance Distribution (as shown in Figure 5 A and 5B); In described the second mode of operation, the second imageing sensor 241 obtains the second picture frame IF
2, not in abutting connection with described the second imageing sensor 241 and be positioned at the field range θ of described the second imageing sensor
2described pointolite (for example the first pointolite 232) luminous to compensate described the second picture frame IF
2luminance Distribution; In described the 3rd mode of operation, the 3rd imageing sensor 251 obtains the 3rd picture frame IF
3, owing to now there not being other imageing sensors to be positioned at the field range θ of described the 3rd imageing sensor
3in, therefore without carrying out light filling; But, if the corner 214 of described touch surface 11 is provided with supplementary lighting sources in addition, when described the 3rd imageing sensor 251 obtains described the 3rd picture frame IF
3time (under the 3rd mode of operation), the supplementary lighting sources of corner 214 that is positioned at described touch surface 11 is luminous to compensate described the 3rd picture frame IF
3luminance Distribution.In addition the imageing sensor number operating in each mode of operation, is not defined as 1.
Please refer to shown in Fig. 7 A, it shows the schematic diagram of the luminance compensation method of the optical touch control system 2 of Fig. 6, and now supposes that described strip-shaped light source 221-224 is reflecting strips.In the present embodiment, in described the first mode of operation with the described pointolite 232 of described the first imageing sensor 231 adjacency with not in abutting connection with described the first imageing sensor 231 and be positioned at the field range θ of described the first imageing sensor
1described pointolite (for example pointolite 242) luminous with different brightness, for example brightness is respectively B
1and B
2; In described the second mode of operation with the described pointolite 242 of described the second imageing sensor 241 adjacency with not in abutting connection with described the second imageing sensor 241 and be positioned at the field range θ of described the second imageing sensor
2described pointolite (for example pointolite 232) luminous with different brightness, for example brightness is respectively B
4and B
3; Only luminous with the described pointolite 252 of described the 3rd imageing sensor 251 adjacency in described the 3rd mode of operation.
Please 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 now supposes that described strip-shaped light source 221-224 is light-emitting section.In the present embodiment, not luminous and not in abutting connection with described the first imageing sensor 231 and be positioned at the field range θ of described the first imageing sensor with the described pointolite 232 of described the first imageing sensor 231 adjacency in described the first mode of operation
1described pointolite (for example pointolite 242) luminous, and now at least part described light-emitting section luminous (being for example shown as 222,223 herein); Not luminous and not in abutting connection with described the second imageing sensor 241 and be positioned at the field range θ of described the second imageing sensor with the described pointolite 242 of described the second imageing sensor 241 adjacency in described the second mode of operation
2described pointolite (for example pointolite 232) luminous, and now at least part described light-emitting section luminous (being for example shown as 221,224 herein); Described in described the 3rd mode of operation, supplementary lighting sources 232,242,252 is all not luminous, and now at least part described light-emitting section luminous (being for example shown as 223,224 herein).
Although imageing sensor described in Fig. 6 and described pointolite all show the corner that is positioned at described touch surface 11, the present invention is not as limit, and the pointolite of described imageing sensor and its adjacency also can be arranged at the edge 221-224 of described touch surface 11.
In various embodiments of the present invention, the fluorescent lifetime (radiation period) of the sampling time (sampling period) of described imageing sensor, described pointolite and the fluorescent lifetime of described light-emitting section can be selected according to different application equal or unequal, there is no specific limited.
In addition, when the number of light sources of described pointolite is greater than the number of sensors of described imageing sensor, be not arranged at the corner of described touch surface in abutting connection with the described pointolite of described imageing sensor, discontinuous in order to compensate the brightness of angle position.
In addition, supplementary lighting sources described in the present invention is not defined as pointolite, can select the active light sources such as line source yet, and it can design according to the shape of the dark areas in picture frame in advance, there is no specific limited.
In the various embodiments described above, the number of described imageing sensor, described pointolite and described strip-shaped light source and setting position are only exemplary, and it can determine according to different system design, be not limited to disclosed person.The luminosity (or drive current) of described pointolite and described light-emitting section can be adjusted and proofread and correct and be stored in storage unit in advance before dispatching from the factory.
Should be noted that, in Fig. 2 A-2D and 6, though described imageing sensor, described pointolite and described strip-shaped light source are depicted as on the surface that is arranged at described touch surface 11, it is not in order to limit the present invention; Described imageing sensor, described pointolite and described strip-shaped light source for example can be set up in described touch surface 11 tops or outer rim by support or other elements, are not limited to illustrated.
Should be noted that, although in the explanation of the various embodiments described above, picture frame is compensated for as uniform luminance by compensatory light, the present invention is not as limit.According to different application, compensatory light can have certain luminance distribution and non-uniform Distribution in order to picture frame is compensated for as.
In sum, known optical touch-control system causes in picture frame Luminance Distribution inhomogeneous because of touch surface corner or position of image sensor, thereby may cause the situation of erroneous judgement.The present invention separately proposes a kind of optical touch control system (Fig. 2 A-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 compensating images sensor obtain the inhomogeneous situation of Luminance Distribution in picture frame, to avoid judging by accident the position of touch of object.
Although the present invention is by disclosing with previous embodiment, it is not in order to limit the present invention, and any have common knowledge technology personnel in the technical field of the invention, without departing from the spirit and scope of the present invention, and when doing various changes and modification.Therefore protection scope of the present invention is when being as the criterion depending on accompanying claim scope institute confining spectrum.
Claims (20)
1. an optical touch control system, this optical touch control system comprises:
Touch surface;
Multiple reflecting strips, are arranged at respectively multiple edges of described touch surface;
The first imageing sensor, in order to obtain the picture frame across described touch surface;
The first active light source, in abutting connection with described the first imageing sensor setting; And
The second active light source, is arranged at the corner of described touch surface and is positioned at described the first imageing sensor within sweep of the eye;
Wherein during described the first imageing sensor obtains the first picture frame, described the first active light source is luminous and described the second active light source is luminous with the second brightness with the first brightness, and described the first brightness is greater than described the second brightness.
2. optical touch control system according to claim 1, the described corner that is wherein provided with the described touch surface of described the second active light source is also provided with to obtain the second imageing sensor across the picture frame of described touch surface.
3. optical touch control system according to claim 1 and 2, wherein said the first imageing sensor and described the first active light source are arranged at the described edge of described touch surface or are arranged at the corner of described the second active light source of not arranging of described touch surface.
4. optical touch control system according to claim 2, wherein said the first imageing sensor and described the first active light source are positioned at described the second imageing sensor within sweep of the eye, during described the second imageing sensor obtains the second picture frame, described the first active light source is luminous and described the second active light source is luminous with the 4th brightness with the 3rd brightness, and described the 4th brightness is greater than described the 3rd brightness.
5. optical touch control system according to claim 4, wherein said the first imageing sensor and described the first active light source are arranged at the described edge of described touch surface or are arranged at the corner of described the second active light source of not arranging of described touch surface.
6. optical touch control system according to claim 1 and 2, this optical touch control system also comprises the 3rd imageing sensor and the 3rd active light source, described the 3rd imageing sensor and described the 3rd active light source are adjacent to each other and are arranged at the described edge of described touch surface and are positioned at the within sweep of the eye described of described the first imageing sensor, wherein during described the first imageing sensor obtains described the first picture frame, described the first active light source is luminous and described the 3rd active light source is luminous with the 5th brightness with described the first brightness, and described the first brightness is greater than described the 5th brightness.
7. optical touch control system according to claim 6, wherein said the first imageing sensor and described the first active light source are arranged at the described edge of described touch surface or are arranged at the corner of described the second active light source of not arranging of described touch surface.
8. according to the optical touch control system described in claim 6 or 7, wherein said the second brightness equals or is not equal to described the 5th brightness.
9. an optical touch control system, this optical touch control system comprises:
Touch surface;
Multiple light-emitting sections, are arranged at respectively multiple edges of described touch surface;
The first imageing sensor, in order to obtain the picture frame across described touch surface; And
Active light source, is arranged at the corner of described touch surface and is positioned at described the first imageing sensor within sweep of the eye;
Wherein, during described the first imageing sensor obtains the first picture frame, at least part of described light-emitting section and described active light source are luminous.
10. optical touch control system according to claim 9, the described corner that is wherein provided with the described touch surface of described active light source is also provided with to obtain the second imageing sensor across the picture frame of described touch surface.
11. according to the optical touch control system described in claim 9 or 10, and wherein said the first imageing sensor is arranged at the described edge of described touch surface or is arranged at the corner that described active light source is not set of described touch surface.
12. optical touch control systems according to claim 10, this optical touch control system also comprises the first active light source arranging in abutting connection with described the first imageing sensor, wherein said the first imageing sensor and described the first active light source are positioned at described the second imageing sensor within sweep of the eye, during described the second imageing sensor obtains the second picture frame, at least part of described light-emitting section and described the first active light source are luminous.
13. optical touch control systems according to claim 12, wherein said the first imageing sensor and described the first active light source are arranged at the described edge of described touch surface or are arranged at the corner that described active light source is not set of described touch surface.
14. according to the optical touch control system described in claim 9 or 10, this optical touch control system also comprises the 3rd imageing sensor and the 3rd active light source, described the 3rd imageing sensor and described the 3rd active light source are adjacent to each other and are arranged at the described edge of described touch surface and are positioned at the within sweep of the eye described of described the first imageing sensor, wherein, during described the first imageing sensor obtains described the first picture frame, described the 3rd active light source is luminous.
15. optical touch control systems according to claim 14, wherein said the first imageing sensor is arranged at the described edge of described touch surface or is arranged at the corner that described active light source is not set of described touch surface.
The luminance compensation method of 16. 1 kinds of optical touch control systems, described optical touch control system comprises touch surface, multiple strip-shaped light source, multiple imageing sensor and multiple active light source, and described in each, imageing sensor is in abutting connection with a described active light source, and described luminance compensation method comprises:
The first mode of operation, in described the first mode of operation, the first imageing sensor obtains the first picture frame, not in abutting connection with described the first imageing sensor and to be positioned at the within the vision described active light source of described the first imageing sensor luminous to compensate the Luminance Distribution of described the first picture frame; And
The second mode of operation, in described the second mode of operation, the second imageing sensor obtains the second picture frame, not in abutting connection with described the second imageing sensor and to be positioned at the within the vision described active light source of described the second imageing sensor luminous to compensate the Luminance Distribution of described the second picture frame;
Wherein said the first mode of operation and described the second mode of operation are performed successively.
17. luminance compensation methods according to claim 16, wherein said strip-shaped light source is reflecting strips, in described the first mode of operation from the described active light source of described the first imageing sensor adjacency with not in abutting connection with described the first imageing sensor and to be positioned at the described active light source described within the vision of described the first imageing sensor luminous with different brightness; In described the second mode of operation from the described active light source of described the second imageing sensor adjacency with not in abutting connection with described the second imageing sensor and to be positioned at the described active light source described within the vision of described the second imageing sensor luminous with different brightness.
18. luminance compensation methods according to claim 16, wherein said strip-shaped light source is light-emitting section, not luminous and not in abutting connection with described the first imageing sensor and to be positioned at the described active light source described within the vision of described the first imageing sensor luminous with the described active light source of described the first imageing sensor adjacency in described the first mode of operation; Not luminous and not in abutting connection with described the second imageing sensor and to be positioned at the described active light source described within the vision of described the second imageing sensor luminous with the described active light source of described the second imageing sensor adjacency in described the second mode of operation.
19. according to the luminance compensation method described in any one claim in claim 16-18, wherein said imageing sensor and be arranged at edge or the corner of described touch surface with the active light source of this imageing sensor adjacency.
20. according to the luminance compensation method described in any one claim in claim 16-18, the number of light sources of wherein said active light source is greater than the number of sensors of described imageing sensor, is not arranged at the corner of described touch surface in abutting connection with the described active light source of described imageing sensor.
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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 |
| CN114365077A (en) * | 2019-09-05 | 2022-04-15 | 杜比实验室特许公司 | Viewer synchronized illumination sensing |
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| 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 |
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| US20110061950A1 (en) * | 2009-09-17 | 2011-03-17 | Pixart Imaging Inc. | Optical Touch Device and Locating Method thereof, and Linear Light Source Module |
| TW201117065A (en) * | 2009-11-04 | 2011-05-16 | Coretronic Corp | Optical touch apparatus and driving mothod |
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| CN103793104B (en) | 2017-05-03 |
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