CN201497971U - Light resistance circuit of infrared touch screen - Google Patents
Light resistance circuit of infrared touch screen Download PDFInfo
- Publication number
- CN201497971U CN201497971U CN2009201344519U CN200920134451U CN201497971U CN 201497971 U CN201497971 U CN 201497971U CN 2009201344519 U CN2009201344519 U CN 2009201344519U CN 200920134451 U CN200920134451 U CN 200920134451U CN 201497971 U CN201497971 U CN 201497971U
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- bias light
- light intensity
- circuit
- infrared
- level
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Abstract
The utility model discloses a light resistance circuit of an infrared touch screen. The light resistance circuit comprises a bias light intensity collecting unit, a bias light holding circuit, a bias light intensity AD conversion unit, a control singlechip, a compensation level DA conversion unit and a subtraction circuit, wherein the control singlechip is connected and control the bias light intensity collecting unit, the bias light holding circuit, the bias light intensity AD conversion unit and the compensation level DA conversion unit, the input end of the subtraction unit is connected with an infrared receiving signal channel, the bias light holding circuit and the compensation level DA conversion unit. The light resistance circuit shortens the emission time and emission current of a lamp as much as possible on the premise of a certain light resistance, simplifies the receiving circuit, prolongs the emission distance, and improves the scanning speed.
Description
Technical field
The utility model relates to a kind of anti-optical road 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.
The utility model content
In order to overcome the deficiency on existing infrared touch panel anti-optical road, the utility model provides a kind of new solution, this scheme has adopted the mode of output signal subtracting background light of allowing, 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 utility model is to solve 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 D A 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 beneficial effects of the utility model are can shorten the launch time and the transmitter current of lamp under the prerequisite that guarantees certain light resistance, simplification receiving circuit, prolongation transmitting range and raising sweep velocity as far as possible.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified:
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is a control program flow process of the present utility model.
Embodiment
With embodiment the utility model 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 D A 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 D A 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 utility model and spirit, can there be the various deformation scheme to realize the utility model, the above only is the preferable feasible embodiment of the utility model, be not so limit to interest field of the present utility model, the equivalent structure that all utilization the utility model instructionss and accompanying drawing content are done changes, and all is contained within the interest field of the present utility model.
Claims (1)
1. the anti-optical road of an infrared touch panel, it 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201344519U CN201497971U (en) | 2009-07-31 | 2009-07-31 | Light resistance circuit of infrared touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201344519U CN201497971U (en) | 2009-07-31 | 2009-07-31 | Light resistance circuit of infrared touch screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201497971U true CN201497971U (en) | 2010-06-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201344519U Expired - Fee Related CN201497971U (en) | 2009-07-31 | 2009-07-31 | Light resistance circuit of infrared touch screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201497971U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096531A (en) * | 2011-02-18 | 2011-06-15 | 福州华映视讯有限公司 | Operation method for optical touch display device |
| CN102611421A (en) * | 2011-01-12 | 2012-07-25 | 夏普株式会社 | Sensor device and electronic apparatus |
| CN102622138A (en) * | 2012-02-29 | 2012-08-01 | 广东威创视讯科技股份有限公司 | Optical touch control positioning method and optical touch control positioning system |
| CN114384314A (en) * | 2021-12-31 | 2022-04-22 | 芯海科技（深圳）股份有限公司 | Signal detection circuit, method, integrated circuit, detection device and electronic equipment |
-
2009
- 2009-07-31 CN CN2009201344519U patent/CN201497971U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611421A (en) * | 2011-01-12 | 2012-07-25 | 夏普株式会社 | Sensor device and electronic apparatus |
| CN102611421B (en) * | 2011-01-12 | 2015-01-07 | 夏普株式会社 | Sensor device and electronic apparatus |
| CN102096531A (en) * | 2011-02-18 | 2011-06-15 | 福州华映视讯有限公司 | Operation method for optical touch display device |
| CN102622138A (en) * | 2012-02-29 | 2012-08-01 | 广东威创视讯科技股份有限公司 | Optical touch control positioning method and optical touch control positioning system |
| CN102622138B (en) * | 2012-02-29 | 2014-12-24 | 广东威创视讯科技股份有限公司 | Optical touch control positioning method and optical touch control positioning system |
| CN114384314A (en) * | 2021-12-31 | 2022-04-22 | 芯海科技（深圳）股份有限公司 | Signal detection circuit, method, integrated circuit, detection device and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20100731 |