CN103677437A - Optical touch device and brightness correction device - Google Patents
Optical touch device and brightness correction device Download PDFInfo
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- CN103677437A CN103677437A CN201210333058.9A CN201210333058A CN103677437A CN 103677437 A CN103677437 A CN 103677437A CN 201210333058 A CN201210333058 A CN 201210333058A CN 103677437 A CN103677437 A CN 103677437A
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- light
- light source
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Abstract
The invention discloses an optical touch device which comprises a light source, a light guide plate, a sensing surface, an image sensor and a control unit. The light guide plate is used for receiving light from the light source and emitting the light, and the light guide plate comprises a reflecting region which is used for reflecting the light from the light source so as to generate reflected light for correction. When the distance between an object and the sensing surface is smaller than a preset distance, an image of the object is generated according to the light emitted by the light guide plate. The image sensor is used for calculating the brightness, used for correction and generated on the light guide plate, of the light source according to the reflected light for correction, and capturing a plurality of image frames in the image of the object. The control unit is used for adjusting the light source according to the brightness for correction so as to enable the light source to generate preset brightness, or the control unit is used for adjusting the image sensor according to the brightness for correction to enable the image sensor to sense the preset brightness so that a plurality of corrected image frames can be obtained, and working out the position of the object on the sensing surface according to the corrected image frames.
Description
Technical field
The present invention relates to a kind of optical touch control apparatus and luminance correction device, relevant especially a kind of light reflecting by light guide plate carrys out optical touch control apparatus and the luminance correction device of calibration light source.
Background technology
Fig. 1 has illustrated the optical touch control apparatus 100 of prior art.As shown in Figure 1, optical touch control apparatus 100 has comprised a sensitive surface 101, light source 103 and an image sensor 105.Light source 103 can produce light and be incident upon the finger F in sensitive surface, and image sensor 105 can pass through the image from the reflected light sensing finger F of finger F, and calculates according to this positional information or the motion track of finger F in sensitive surface 101 and carry out the use as touch-control.
Yet, the brightness that light source 103 produces may be not constant as expected.For instance, along with the increase of service time, the brightness that light source 103 produces may decay to some extent, even if give identical drive current or voltage, the brightness that light source 103 produces also can interimly come lowly than pre-.So, may allow the sensor operation of image sensor 105 produce mistake.Yet optical touch control apparatus of the prior art does not but have the brightness of detecting real-time light source the mechanism of correcting luminance.
Summary of the invention
Therefore, an object of the present invention is to disclose a kind of optical touch control apparatus that can real time correction brightness.
Another object of the present invention is to disclose a kind of luminance correction device that can real time correction brightness.
One embodiment of the present of invention disclose a kind of optical touch control apparatus, comprise: light source; Light guide plate, in order to receive from this light of this light source and to penetrate this light, wherein this light guide plate comprises echo area, in order to reflection from this light of this light source to produce correction reflected light; Sensitive surface, when the distance of object and this sensitive surface is less than preset distance, according to this light that this light guide plate penetrates certainly to produce object image; Image sensor, in order to calculate with reflected light the correction brightness that this light source produces in this light guide plate according to this correction, and captures a plurality of picture frames in this object image; And control module, according to this correction, with this light source of brightness adjustment, make this light source produce predetermined luminance, or with this image sensor of brightness adjustment, make this image sensor sense predetermined luminance according to this correction, to obtain picture frame after a plurality of corrections, and calculate this object in the position of this sensitive surface according to picture frame after the plurality of correction.
An alternative embodiment of the invention discloses a kind of luminance correction device, comprises: light source; Light guide plate, in order to receive from this light of this light source and to penetrate this light, wherein this light guide plate comprises echo area, in order to reflection from this light of this light source to produce correction reflected light; Luminance sensor, in order to calculate with reflected light the correction brightness that this light source produces in this light guide plate according to this correction; And control module, according to this correction, with this light source of brilliance control, make this light source produce predetermined luminance, or with this sensor of brilliance control, make this sensor sense predetermined luminance according to this correction.
By aforesaid embodiment, the brightness of the light that calibration light source that can be real-time penetrates, or the brightness of the light that senses of image sensor, make brightness can maintain the constant position with correct object sensing or shift action.
Accompanying drawing explanation
Fig. 1 has illustrated the optical touch control apparatus of prior art.
Fig. 2 has illustrated according to the side view of the optical touch control apparatus of the embodiment of the present invention.
Fig. 3 has illustrated according to the vertical view of the optical touch control apparatus of the embodiment of the present invention.
Fig. 4 has illustrated the process flow diagram of the optical touch control apparatus correcting luminance shown in Fig. 2.
Fig. 5 has illustrated the optical touch control apparatus shown in Fig. 2 and to proofread and correct rear brightness, has carried out the process flow diagram of optical touch.
Wherein, description of reference numerals is as follows:
100,200,300 optical touch control apparatus
101,201,301 sensitive surface
103,203 light sources
105,205 image sensors
207 light guide plate
208,307,309 echo areas
209 control modules
303 Touch Zones
305 non-Touch Zones
401-509 step
Embodiment
In the middle of instructions and claim above, used some vocabulary to censure specific element.Person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.This instructions and claim above are not used as distinguishing the mode of element with the difference of title, but the difference in function is used as the criterion of distinguishing with element.In the whole text, in the middle of instructions and claim above, be an open term mentioned " comprising ", therefore should be construed to " comprise but be not limited to ".
Fig. 2 has illustrated according to the side view of the optical touch control apparatus 200 of the embodiment of the present invention.As shown in Figure 2, optical touch control apparatus 200 comprises a sensitive surface 201, light source 203, image sensor 205, light guide plate 207 and a control module 209.And light guide plate 207 has further comprised an echo area 208.Light guide plate 207 is in order to receive from the light of light source 203 and to penetrate light TL to sensitive surface 201.Echo area 208 is used reflected light RL from the light of light source 203 to produce to proofread and correct in order to reflection.The reflecting material that echo area 208 can have by being coated with in light guide plate specific reflectance forms, or by providing a reflective fabric to form in light guide plate.
When an object is less than a preset distance as the distance of finger F and sensitive surface 201 (namely object is suspended in sensitive surface 201 tops or contact sensing surface 201), object can be according to the light TL penetrating from light guide plate 207 to produce an object image.Image sensor 209 is in order to calculate according to proofreading and correct with reflected light RL the intrinsic brilliance (beneath title correction brightness) that light source 203 produces in light guide plate 207, and a plurality of picture frames in fechtable object image.Control module 209 makes light source 203 produce predetermined luminance according to proofreading and correct with brightness adjustment light source 203.Or if uncomfortable lay the grain source 203, control module 209 can be also predetermined luminance with the brightness that brightness adjustment image sensor 209 senses image sensor 209 according to proofreading and correct, and so also can reach identical effect.In addition, control module 209 also can calculate object in the position of sensitive surface 201 according to captured picture frame.Please be careful, when control module does not only capture picture frame in order to calculate brightness and adjustment brightness, optical touch control apparatus 200 can be regarded a luminance correction device as, and image sensor can be regarded a luminance sensor as.Action will illustrate down below in detail.
Fig. 3 has illustrated according to the vertical view of the optical touch control apparatus 300 of the embodiment of the present invention.As shown in Figure 3, optical touch control apparatus 300 has comprised a sensitive surface 301, and sensitive surface 301 has comprised a Touch Zone 303 and a non-Touch Zone 305.Touch Zone 303 represents that object is often mobile to produce the region of touch controllable function in the above, but not to be objects less in Touch Zone 305 mobile region in the above.Therefore, Touch Zone may be defined to: the frequency of object contact Touch Zone is greater than the region of the contact frequency in other regions.Or, in other examples, touch controllable function only can be carried out by Touch Zone 303, can not carry out by the Ru Fei Touch Zone, region 305 outside Touch Zone 303, that is to say that sensitive surface 301 only 303 just can sense object in the position of sensitive surface 301 in Touch Zone.The You Fei Touch Zone, region 305 of echo area 307,309 and determining, for example, below the Wei Fei Touch Zone, region 305 of this embodiment echo area 307,309, but not in order to limit scope of the present invention.
Fig. 4 has illustrated the process flow diagram of the optical touch control apparatus correcting luminance shown in Fig. 2.Please jointly with reference to figure 2 and Fig. 4 further to understand content of the present invention.The process flow diagram of Fig. 4 has comprised the following step:
With drive current intensity or the switch periods of presetting, make light source produce light (generation intrinsic brilliance).
Make an image sensor not illuminated object image of acquisition and an illuminated object image.The object that please be careful two type images of step 403 acquisition is to obtain actual brightness, but the present invention do not limit and make in this way, and other ways that can obtain intrinsic brilliance all should be within the scope of the present invention.
According to captured eiconometer, calculate after intrinsic brilliance, adjust according to this drive current intensity or the switch periods (making this light source produce predetermined luminance according to proofreading and correct with this light source of brightness adjustment) of light source, or adjust according to this image exposure time or the luminance gain (making this image sensor sense predetermined luminance according to this correction with this image sensor of brightness adjustment) of image sensor.The data of predetermined luminance can be pre-stored in optical touch control apparatus.
Parameter with the light source after adjusting makes light source generation have the light of predetermined luminance or make image sensor sensing have the image of predetermined luminance with the image sensor parameter after adjusting.After step 407, can finish the action of correcting luminance or get back to the step that step 403 repeats gamma correction.
Gamma correction mechanism can be triggered by software by user or by being arranged on the switch triggering on luminance correction device.Optical touch control apparatus 200 also can be regularly or is irregularly carried out voluntarily gamma correction mechanism.
Fig. 5 has illustrated the optical touch control apparatus shown in Fig. 2 and to proofread and correct rear brightness, has carried out the process flow diagram of optical touch.
With drive current intensity or the switch periods of presetting, make light source produce light (generation intrinsic brilliance).
Make an image sensor not illuminated object image of acquisition and an illuminated object image.The same with step 403, the object of step 503 acquisition two type images is being obtained actual brightness, but the present invention does not limit and makes in this way.
According to captured eiconometer, calculate after intrinsic brilliance, adjust according to this drive current intensity or the switch periods (making this light source produce predetermined luminance according to proofreading and correct with this light source of brightness adjustment) of light source, or adjust according to this image exposure time or the luminance gain (making this image sensor sense predetermined luminance according to this correction with this image sensor of brightness adjustment) of image sensor.The data of predetermined luminance can be pre-stored in optical touch control apparatus.
With the parameter of the light source after adjusting, light source produced have the light of predetermined luminance or make image sensor sensing there is the image of predetermined luminance with the image sensor parameter after adjusting, to produce object image after a correction (comprise most correction after picture frames).
According to image after proofreading and correct, detect position or the motion track of object.
By aforesaid embodiment, the brightness of the light that calibration light source that can be real-time penetrates, or the brightness of the light that senses of image sensor, make brightness can maintain the constant position with correct object sensing or shift action.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. an optical touch control apparatus, comprises:
Light source;
Light guide plate, in order to receive from this light of this light source and to penetrate this light, wherein this light guide plate comprises echo area, in order to reflection from this light of this light source to produce correction reflected light;
Sensitive surface, when the distance of object and this sensitive surface is less than preset distance, according to this light that this light guide plate penetrates certainly to produce object image;
Image sensor, in order to calculate with reflected light the correction brightness that this light source produces in this light guide plate according to this correction, and captures a plurality of picture frames in this object image; And
Control module, according to this correction, with this light source of brightness adjustment, make this light source produce predetermined luminance, or with this image sensor of brightness adjustment, make this image sensor sense predetermined luminance according to this correction, to obtain picture frame after a plurality of corrections, and calculate this object in the position of this sensitive surface according to picture frame after the plurality of correction.
2. optical touch control apparatus as claimed in claim 1, further comprises:
The reflecting material with specific reflectance, is coated on a wherein part for this light guide plate and forms this echo area.
3. optical touch control apparatus as claimed in claim 1, further comprises:
Reflective fabric, covers a wherein part for this light guide plate and forms this echo area.
4. optical touch control apparatus as claimed in claim 1, wherein this sensitive surface comprises Touch Zone, and this sensitive surface only just can sense this object in the position of this sensitive surface in this Touch Zone, wherein corresponding region outside this Touch Zone, this echo area of this light guide plate.
5. optical touch control apparatus as claimed in claim 1, wherein this sensitive surface comprises Touch Zone, wherein this echo area of this light guide plate corresponds to the region outside this Touch Zone, and the frequency of this this Touch Zone of object contact is greater than this region outside this Touch Zone of contact.
6. optical touch control apparatus as claimed in claim 1, this control module is being proofreaied and correct with after this light source of brightness adjustment according to this, or proofread and correct with after this image sensor of brightness adjustment according to this, more this light source after use adjustment or this image sensor after correction, come this object of sensing this position in this sensitive surface.
7. optical touch control apparatus as claimed in claim 1, this control module is proofreaied and correct with the drive current of brightness adjustment light source or the switching time of this light source according to this.
8. optical touch control apparatus as claimed in claim 1, this control module is proofreaied and correct time shutter or the luminance gain with this image sensor of brightness adjustment according to this.
9. a luminance correction device, comprises:
Light source;
Light guide plate, in order to receive from this light of this light source and to penetrate this light, wherein this light guide plate comprises echo area, in order to reflection from this light of this light source to produce correction reflected light;
Luminance sensor, in order to calculate with reflected light the correction brightness that this light source produces in this light guide plate according to this correction; And
Control module, makes this light source produce predetermined luminance according to this correction with this light source of brilliance control, or with this sensor of brilliance control, makes this sensor sense predetermined luminance according to this correction.
10. luminance correction device as claimed in claim 9, further comprises:
The reflecting material with specific reflectance, is coated on a wherein part for this light guide plate and forms this echo area.
11. luminance correction devices as claimed in claim 9, further comprise:
Reflective fabric, covers a wherein part for this light guide plate and forms this echo area.
12. luminance correction devices as claimed in claim 9, this control module is proofreaied and correct with the drive current of brightness adjustment light source or the switching time of this light source according to this.
13. luminance correction devices as claimed in claim 9, this control module is proofreaied and correct time shutter or the luminance gain with this image sensor of brightness adjustment according to this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333058.9A CN103677437A (en) | 2012-09-10 | 2012-09-10 | Optical touch device and brightness correction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210333058.9A CN103677437A (en) | 2012-09-10 | 2012-09-10 | Optical touch device and brightness correction device |
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| CN103677437A true CN103677437A (en) | 2014-03-26 |
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| CN201210333058.9A Pending CN103677437A (en) | 2012-09-10 | 2012-09-10 | Optical touch device and brightness correction device |
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| CN107239176A (en) * | 2016-03-28 | 2017-10-10 | 音飞光电科技股份有限公司 | Utilize the optical touch control apparatus of image-forming module |
| CN107591127A (en) * | 2017-10-13 | 2018-01-16 | 京东方科技集团股份有限公司 | Image element circuit, array base palte, organic EL display panel and display device |
| CN111784988A (en) * | 2016-12-27 | 2020-10-16 | 原相科技股份有限公司 | Wearable device and related detection method |
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Application publication date: 20140326 |