CN101615098A - A kind of anti-optical road of infrared touch panel and anti-light method - Google Patents
A kind of anti-optical road of infrared touch panel and anti-light method Download PDFInfo
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- CN101615098A CN101615098A CN200910109224A CN200910109224A CN101615098A CN 101615098 A CN101615098 A CN 101615098A CN 200910109224 A CN200910109224 A CN 200910109224A CN 200910109224 A CN200910109224 A CN 200910109224A CN 101615098 A CN101615098 A CN 101615098A
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Abstract
The present invention discloses a kind of anti-optical road of infrared touch panel, comprises bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, control single chip computer, compensation level DA converting unit, subtraction circuit; Described control single chip computer connects control bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, compensation level DA converting unit; Described subtraction circuit input is connected with infrared received signal passage, bias light holding circuit and compensation level DA converting unit.The anti-light method of infrared touch panel, step is: A. gathers bias light intensity; B. launch effective infrared signal; C. receiving end receives infrared signal; D. the infrared light intensity subtracting background light intensity that receives is obtained effective receiving light power degree.The invention has the beneficial effects as follows, can under the prerequisite that guarantees certain light resistance, shorten the launch time and the transmitter current of lamp as far as possible, simplify receiving circuit, prolong transmitting range and improve sweep velocity.
Description
Technical field
The present invention relates to a kind of anti-optical road and anti-light method of infrared touch panel, especially can obviously improve the shortcoming that existing infrared touch panel light resistance energy is relatively poor, transmitting range short, the complete machine consumed power is big.
Background technology
Infrared touch panel is to utilize X, and the infrared ray matrix that gathers on the Y direction detects the also touch of consumer positioning.Infrared touch panel is installed a circuit board housing in the front of display, circuit board arrange on screen four limits infrared emission tube and infrared receiving tube, the corresponding one by one infrared ray matrix that becomes to intersect anyhow.The user is when touch screen, and finger will block two infrared rays anyhow through this position, thereby can judge the position of touch point at screen.
At present, general infrared touch panel is in order to slacken the influence of ambient light to infrared touch panel, generally take the mode of on infrared discharge lamps useful signal being modulated, receiving end has adopted the mode of demodulation to guarantee to remove direct current, from then on removes the influence of ambient light to useful signal.But, because the emission of infrared transmitting tube needs filament certain preheating time, not so can not reach the luminous intensity of nominal, consume bigger emissive power, and ultrared actual transmissions distance is shortened greatly so available circuit exists need take long launch time or need.
Summary of the invention
In order to overcome the deficiency on existing infrared touch panel anti-optical road, the invention provides a kind of new solution, this scheme has adopted the mode of output signal subtracting background light of allowing, and allow final useful signal only reflect that the useful signal of transmitting terminal changes, and the variation of bias light is designed the circuit filtering.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of anti-optical road of infrared touch panel, it comprises bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, control single chip computer, compensation level DA converting unit, subtraction circuit; Described control single chip computer connects control bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, compensation level DA converting unit; Described subtraction circuit input is connected with infrared received signal passage, bias light holding circuit and compensation level DA converting unit.
A kind of anti-light method of infrared touch panel, it may further comprise the steps:
A. gather bias light intensity;
B. launch effective infrared signal;
C. receiving end receives infrared signal;
D. the infrared light intensity that infrared receiving end is received deducts the bias light intensity that had before collected and obtains effective receiving light power degree.
Described A step may further comprise the steps:
A1. gather bias light intensity;
A2. calculate the level of the bias light intensity correspondence that collects;
A3. the level that keeps bias light intensity correspondence with holding circuit;
A4. calculate the compensation level of the level of bias light intensity correspondence,
Described D step may further comprise the steps:
D1. calculate the level of the infrared signal intensity correspondence that receives;
D2. according to the corresponding compensation of the bias light intensity that calculates level, control DA change-over circuit is exported corresponding level;
D3. the compensation level feed-back of bias light intensity correspondence is arrived two input ends of subtraction circuit, the level of bias light intensity correspondence carries out subtraction with the infrared signal intensity level that receives, and obtains the level of effective receiving light power degree correspondence.
The transmitting terminal of described infrared touch panel is launched infrared signal in order, and corresponding receiving end receives infrared signal by corresponding order; Bias light intensity is gathered in gap at the emission infrared signal.
The invention has the beneficial effects as follows, can under the prerequisite that guarantees certain light resistance, shorten the launch time and the transmitter current of lamp as far as possible, simplify receiving circuit, prolong transmitting range and improve sweep velocity.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples:
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is a control program flow process of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
As shown in the figure, the anti-optical road of a kind of infrared touch panel of present embodiment, it comprises bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, control single chip computer, compensation level DA converting unit, subtraction circuit; Described control single chip computer connects control bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, compensation level DA converting unit; Described subtraction circuit input is connected with infrared received signal passage, bias light holding circuit and compensation level DA converting unit.
A kind of anti-light method of infrared touch panel, it may further comprise the steps:
A. gather bias light intensity;
B. launch effective infrared signal;
C. receiving end receives infrared signal;
D. the infrared light intensity that infrared receiving end is received deducts the bias light intensity that had before collected and obtains effective receiving light power degree.
Described A step may further comprise the steps:
A1. gather bias light intensity;
A2. calculate the level of the bias light intensity correspondence that collects;
A3. the level that keeps bias light intensity correspondence with holding circuit;
A4. calculate the compensation level of the level of bias light intensity correspondence, described D step may further comprise the steps:
D1. calculate the level of the infrared signal intensity correspondence that receives;
D2. according to the corresponding compensation of the bias light intensity that calculates level, control DA change-over circuit is exported corresponding level;
D3. the compensation level feed-back of bias light intensity correspondence is arrived two input ends of subtraction circuit, the level of bias light intensity correspondence carries out subtraction with the infrared signal intensity level that receives, and obtains the level of effective receiving light power degree correspondence.
The transmitting terminal of described infrared touch panel is launched infrared signal in order, and corresponding receiving end receives infrared signal by corresponding order; Bias light intensity is gathered in gap at the emission infrared signal.
The technical scheme that is adopted is: add a level collection and holding circuit at signal input part, before allowing signal launch, circuit is gathered the background light intensity automatically, and, entering control single chip computer by the AD conversion, control single chip computer is according to certain algorithm, calculate the compensation level of present correspondence, output to the DA converting unit then, the DA converting unit will compensate level again and feed back to the subtraction that signalling channel participates in bias light and signalling channel, only export useful signal at last.Reach the influence of wiping out background light.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations instructions of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (4)
1, a kind of anti-optical road of infrared touch panel is characterized in that: it comprises bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, control single chip computer, compensation level DA converting unit, subtraction circuit; Described control single chip computer connects control bias light intensity collecting unit, bias light holding circuit, bias light intensity A D converting unit, compensation level DA converting unit; Described subtraction circuit input is connected with infrared received signal passage, bias light holding circuit and compensation level DA converting unit.
2, a kind of anti-light method of infrared touch panel is characterized in that it may further comprise the steps:
A. gather bias light intensity;
B. launch effective infrared signal;
C. receiving end receives infrared signal;
D. the infrared light intensity that infrared receiving end is received deducts the bias light intensity that had before collected and obtains effective receiving light power degree.
3, the anti-light method of a kind of infrared touch panel as claimed in claim 2 is characterized in that described A step may further comprise the steps:
A1. gather bias light intensity;
A2. calculate the level of the bias light intensity correspondence that collects;
A3. the level that keeps bias light intensity correspondence with holding circuit;
A4. calculate the compensation level of the level of bias light intensity correspondence, described D step may further comprise the steps:
D1. calculate the level of the infrared signal intensity correspondence that receives;
D2. according to the corresponding compensation of the bias light intensity that calculates level, control DA change-over circuit is exported corresponding level;
D3. the compensation level feed-back of bias light intensity correspondence is arrived two input ends of subtraction circuit, the level of bias light intensity correspondence carries out subtraction with the infrared signal intensity level that receives, and obtains the level of effective receiving light power degree correspondence.
4. the anti-light method of a kind of infrared touch panel as claimed in claim 2, it is characterized in that: the transmitting terminal of described infrared touch panel is launched infrared signal in order, and corresponding receiving end receives infrared signal by corresponding order; Bias light intensity is gathered in gap at the emission infrared signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910109224A CN101615098A (en) | 2009-07-31 | 2009-07-31 | A kind of anti-optical road of infrared touch panel and anti-light method |
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| CN200910109224A CN101615098A (en) | 2009-07-31 | 2009-07-31 | A kind of anti-optical road of infrared touch panel and anti-light method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192829A (en) * | 2010-03-08 | 2011-09-21 | 北京汇冠新技术股份有限公司 | Device and method for testing anti-light interference performance of infrared touch screen |
| CN104207761A (en) * | 2013-06-03 | 2014-12-17 | 飞比特公司 | Heart rate data collection |
| US9237855B2 (en) | 2012-06-22 | 2016-01-19 | Fitbit, Inc. | Wearable heart rate monitor |
| CN105259587A (en) * | 2015-10-10 | 2016-01-20 | 深圳市威京利电子有限公司 | Output detection system of infrared induction strip and method thereof |
| US9392946B1 (en) | 2015-05-28 | 2016-07-19 | Fitbit, Inc. | Heart rate sensor with high-aspect-ratio photodetector element |
| US9402552B2 (en) | 2012-06-22 | 2016-08-02 | Fitbit, Inc. | Heart rate data collection |
| US9456787B2 (en) | 2012-06-22 | 2016-10-04 | Fitbit, Inc. | Wearable heart rate monitor |
| US10216894B2 (en) | 2010-09-30 | 2019-02-26 | Fitbit, Inc. | Multimode sensor devices |
| US10433739B2 (en) | 2016-04-29 | 2019-10-08 | Fitbit, Inc. | Multi-channel photoplethysmography sensor |
| CN110825270A (en) * | 2019-09-17 | 2020-02-21 | 深圳市凯健奥达科技有限公司 | Natural highlight resistant device of infrared touch screen |
| US10568525B1 (en) | 2015-12-14 | 2020-02-25 | Fitbit, Inc. | Multi-wavelength pulse oximetry |
| US11051706B1 (en) | 2017-04-07 | 2021-07-06 | Fitbit, Inc. | Multiple source-detector pair photoplethysmography (PPG) sensor |
| US11206989B2 (en) | 2015-12-10 | 2021-12-28 | Fitbit, Inc. | Light field management in an optical biological parameter sensor |
| US11259707B2 (en) | 2013-01-15 | 2022-03-01 | Fitbit, Inc. | Methods, systems and devices for measuring heart rate |
-
2009
- 2009-07-31 CN CN200910109224A patent/CN101615098A/en active Pending
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192829A (en) * | 2010-03-08 | 2011-09-21 | 北京汇冠新技术股份有限公司 | Device and method for testing anti-light interference performance of infrared touch screen |
| CN102192829B (en) * | 2010-03-08 | 2013-11-06 | 北京汇冠新技术股份有限公司 | Device and method for testing anti-light interference performance of infrared touch screen |
| US11883195B2 (en) | 2010-09-30 | 2024-01-30 | Fitbit, Inc. | Multimode sensor devices |
| US10381109B2 (en) | 2010-09-30 | 2019-08-13 | Fitbit, Inc. | Multimode sensor devices |
| US10216893B2 (en) | 2010-09-30 | 2019-02-26 | Fitbit, Inc. | Multimode sensor devices |
| US10216894B2 (en) | 2010-09-30 | 2019-02-26 | Fitbit, Inc. | Multimode sensor devices |
| US9402552B2 (en) | 2012-06-22 | 2016-08-02 | Fitbit, Inc. | Heart rate data collection |
| US10178973B2 (en) | 2012-06-22 | 2019-01-15 | Fitbit, Inc. | Wearable heart rate monitor |
| US9456787B2 (en) | 2012-06-22 | 2016-10-04 | Fitbit, Inc. | Wearable heart rate monitor |
| US9662053B2 (en) | 2012-06-22 | 2017-05-30 | Fitbit, Inc. | Physiological data collection |
| US11096601B2 (en) | 2012-06-22 | 2021-08-24 | Fitbit, Inc. | Optical device for determining pulse rate |
| US9237855B2 (en) | 2012-06-22 | 2016-01-19 | Fitbit, Inc. | Wearable heart rate monitor |
| US11259707B2 (en) | 2013-01-15 | 2022-03-01 | Fitbit, Inc. | Methods, systems and devices for measuring heart rate |
| CN104207761B (en) * | 2013-06-03 | 2016-05-25 | 飞比特公司 | heart rate data collection |
| CN104207761A (en) * | 2013-06-03 | 2014-12-17 | 飞比特公司 | Heart rate data collection |
| US9392946B1 (en) | 2015-05-28 | 2016-07-19 | Fitbit, Inc. | Heart rate sensor with high-aspect-ratio photodetector element |
| US9775548B2 (en) | 2015-05-28 | 2017-10-03 | Fitbit, Inc. | Heart rate sensor with high-aspect-ratio photodetector element |
| CN105259587A (en) * | 2015-10-10 | 2016-01-20 | 深圳市威京利电子有限公司 | Output detection system of infrared induction strip and method thereof |
| CN105259587B (en) * | 2015-10-10 | 2018-04-06 | 深圳市威京利电子有限公司 | The output detection system and its method of infrared induction bar |
| US11206989B2 (en) | 2015-12-10 | 2021-12-28 | Fitbit, Inc. | Light field management in an optical biological parameter sensor |
| US10568525B1 (en) | 2015-12-14 | 2020-02-25 | Fitbit, Inc. | Multi-wavelength pulse oximetry |
| US11317816B1 (en) | 2015-12-14 | 2022-05-03 | Fitbit, Inc. | Multi-wavelength pulse oximetry |
| US10433739B2 (en) | 2016-04-29 | 2019-10-08 | Fitbit, Inc. | Multi-channel photoplethysmography sensor |
| US11633117B2 (en) | 2016-04-29 | 2023-04-25 | Fitbit, Inc. | Multi-channel photoplethysmography sensor |
| US11666235B2 (en) | 2016-04-29 | 2023-06-06 | Fitbit, Inc. | In-canal heart rate monitoring apparatus |
| US11051706B1 (en) | 2017-04-07 | 2021-07-06 | Fitbit, Inc. | Multiple source-detector pair photoplethysmography (PPG) sensor |
| US11779231B2 (en) | 2017-04-07 | 2023-10-10 | Fitbit, Inc. | Multiple source-detector pair photoplethysmography (PPG) sensor |
| CN110825270A (en) * | 2019-09-17 | 2020-02-21 | 深圳市凯健奥达科技有限公司 | Natural highlight resistant device of infrared touch screen |
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