CN111813274A - Wide-temperature infrared touch device and temperature compensation method thereof - Google Patents
Wide-temperature infrared touch device and temperature compensation method thereof Download PDFInfo
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- CN111813274A CN111813274A CN202010577950.6A CN202010577950A CN111813274A CN 111813274 A CN111813274 A CN 111813274A CN 202010577950 A CN202010577950 A CN 202010577950A CN 111813274 A CN111813274 A CN 111813274A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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Abstract
A wide-temperature infrared touch device and a brightness compensation method are provided. The main controller reads the temperature of the infrared light-emitting diode through the temperature acquisition unit, calculates the driving voltage according to calibrated temperature compensation parameters stored in the nonvolatile memory, configures a DAC (digital-to-analog converter) to output a direct-current voltage value and outputs the direct-current voltage value through the power amplification circuit, and therefore temperature compensation of the emission intensity of the infrared light-emitting diode is completed. The invention can effectively eliminate the problem that the performance change of the infrared transmitting tube caused by the temperature change influences the strength and reliability of the optical signal, thereby meeting the application requirement under the harsh environment temperature condition.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to an infrared touch technology, and specifically relates to a wide-temperature infrared touch device and a temperature compensation method thereof.
Background
Infrared Touch (Infrared Touch) is a Touch technology for detecting a Touch action by detecting Infrared ray interruption. The touch screen comprises infrared emitting and receiving sensing elements arranged on a touch screen outer frame, wherein the elements form an infrared detection network on the surface of the screen, and when an object (such as a finger) for touch operation blocks infrared rays, the infrared emitting and receiving sensing elements can be converted into a coordinate position for touch through row-column calculation so as to realize operation response. The touch screen has the characteristics of high light transmittance, no intermediate medium, long service life, no force required for touch, no special requirement on a touch body and the like.
However, when the infrared light emitting diode is applied under severe environmental conditions, especially at low temperature, the forward voltage drop of the infrared light emitting diode becomes large, so that the driving current of the infrared light emitting diode becomes small under the driving circuit of the constant voltage combined with the current limiting resistor, thereby causing insufficient intensity of the light signal and causing the touch performance to be reduced. On the other hand, when the infrared transmitting tube works at high temperature, the forward voltage drop of the infrared transmitting tube is reduced, the driving current is increased, and the reliability problem is caused for the low-power transmitting tube. The constant current driving is adopted to solve the problem, but the constant current driving circuit is complex and has a large circuit area, and is difficult to implement for infrared touch which is generally applied to large-size touch occasions and has higher and higher narrow frame requirements.
Disclosure of Invention
The invention aims to design an infrared touch device working at a wide temperature range aiming at the problem that the touch performance of an infrared touch screen is reduced at a low temperature, and also discloses a corresponding temperature compensation method.
One of the technical schemes of the invention is as follows:
a wide-temperature infrared touch device is characterized by comprising a main controller 1, a nonvolatile memory 2, an infrared emission driving circuit 3, an infrared receiving circuit 4 and a temperature sensing circuit 5. The main controller 1 is respectively connected with the nonvolatile memory 2, the infrared emission driving circuit 3, the infrared receiving circuit 4 and the temperature sensing circuit 5.
The temperature sensing circuit 5 is used for sampling the temperature of the infrared light emitting diode, converting the temperature into a digital signal and transmitting the digital signal to the main controller 1;
the nonvolatile memory 2 is used for storing the temperature of the infrared light-emitting diode and corresponding temperature compensation parameters;
the infrared emission driving circuit 3 comprises a DAC, a power amplifying circuit, an infrared light emitting diode and a series current limiting resistor, and generates an infrared light signal under the control of the controller of the main controller 1;
the infrared receiving circuit 4 comprises an ADC, a signal amplifying circuit and an infrared receiving diode, and converts received infrared light signals into electric signals and transmits the electric signals to the main controller 1.
The second technical scheme of the invention is as follows:
a temperature compensation method of an infrared touch device is characterized by comprising the following steps:
step 1, a main controller controls a temperature sensing unit to collect the temperature of an infrared transmitting tube of an infrared touch screen;
step 2, the main controller queries a driving current control parameter table according to the sampled infrared LED temperature to obtain the address of the corresponding control parameter in the nonvolatile memory;
step 3, reading temperature compensation parameters by the main controller;
step 4, adjusting the driving current of the transmitting tube according to the temperature compensation parameter;
the four steps are recycled, so that the infrared touch screen meets the wide-temperature working requirement.
The emission tube driving current adjusting method is realized by adjusting the output voltage of the power operational amplifier through the DAC so as to change the voltage loaded on the infrared emission tube series current-limiting resistance circuit.
The method for establishing the temperature compensation parameter table is to calibrate the temperature compensation parameters by adopting an upper computer and a constant temperature device, and comprises the following steps:
step 1, placing an infrared touch screen in a constant temperature device, and confirming that no light shielding exists between all infrared transmitting tubes and all infrared receiving tubes;
step 2, adjusting the ambient temperature to enable the temperature of the infrared transmitting tube to reach the target working temperature;
step 3, the upper computer sends the current working temperature value and a calibration instruction to the infrared touch screen main controller;
step 4, calibrating the temperature value acquired by the temperature sampling unit by the infrared touch screen main controller according to the received temperature value;
step 6, reading induced current of the infrared receiving tube by the infrared touch screen main controller, executing step 7 when the induced current is within a preset threshold range, and executing step 5 if the induced current is not within the preset threshold range;
and 7, storing the temperature data and the DAC output voltage into a nonvolatile memory by the infrared touch screen main control controller to form temperature compensation parameters at the target working temperature.
And (4) circularly trying the steps from the step 2 to the step 7, and then establishing a complete temperature compensation parameter table.
The DAC voltage value adjusting method comprises the steps of increasing the DAC output voltage value when the induced current is smaller than a preset minimum threshold value, and decreasing the DAC output voltage value when the induced current is larger than a preset maximum threshold value.
The invention has the beneficial effects that:
the invention can effectively solve the problem that the parameter change of the infrared emission tube caused by the temperature change influences the intensity and reliability of the optical signal, thereby meeting the requirement of wide-temperature application, and the temperature compensation parameter calibration method adopted by the invention can solve the problem that the temperature compensation is difficult to accurately control due to the difference of different infrared emission tubes and control circuits.
Drawings
Fig. 1 is a block diagram of a wide-temperature infrared touch device according to the present invention.
Fig. 2 is a flowchart of a method for compensating for temperature of an infrared touch device according to the present invention.
FIG. 3 is a flowchart of a temperature compensation parameter calibration method according to the present invention.
Fig. 4 is an electrical schematic block diagram of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The first embodiment.
As shown in fig. 1 and 4.
A wide-temperature infrared touch device comprises a main controller 1, a nonvolatile memory 2, an infrared emission driving circuit 3, an infrared receiving circuit 4 and a temperature sensing circuit 5. Main controller 1 links to each other in nonvolatile memory 2, infrared emission drive circuit 3, infrared receiving circuit 4 and temperature sensing circuit 5 respectively, temperature sensing circuit 5 is used for sampling and converting the digital signal transmission to main controller 1 infrared emitting diode temperature, nonvolatile memory 2 is used for saving infrared emitting diode's temperature and the temperature compensation parameter that corresponds, infrared emission drive circuit 3 includes DAC, power amplifier circuit, infrared emitting diode and series connection current-limiting resistor, produces infrared light signal under main controller 1 controller control, infrared receiving circuit 4 includes ADC, signal amplifier circuit, infrared receiving diode, converts received infrared light signal into the signal of telecommunication transmission to main controller 1, as shown in figure 1.
The specific circuit block diagram is shown in fig. 4, a single chip microcomputer MCU integrating an ADC and a DAC is used as a main controller 1, an EEPROM is used as a nonvolatile memory 2, the DAC of the single chip microcomputer, a power amplification circuit, an infrared light emitting diode and a series current limiting resistor form an infrared emission drive circuit, the ADC of the single chip microcomputer, a signal amplification circuit and an infrared receiving diode form an infrared receiving circuit, and a thermistor and the single chip microcomputer ADC form a temperature sensing circuit 5. The single chip microcomputer reads the temperature of the infrared light emitting diode, calculates the driving voltage according to the calibrated temperature compensation parameter in the EEPROM and outputs the driving voltage through the DAC and the power operational amplifier, and therefore temperature compensation of the emission intensity of the infrared light emitting diode is completed.
Example two.
As shown in fig. 2 and 3.
A method for compensating for temperature of an infrared touch device, as shown in fig. 2, comprises the following steps:
step 1, a main controller controls a temperature sensing unit to collect the temperature of an infrared transmitting tube of an infrared touch screen;
step 2, the main controller queries a driving current control parameter table according to the sampled infrared LED temperature to obtain the address of the corresponding control parameter in the nonvolatile memory;
step 3, reading temperature compensation parameters by the main controller;
step 4, adjusting the driving current of the transmitting tube according to the temperature compensation parameter;
the four steps are recycled, so that the infrared touch screen meets the wide-temperature working requirement.
As shown in fig. 3, the calibration of the temperature compensation parameters by using an upper computer and a constant temperature device comprises the following steps:
step 1, placing an infrared touch screen in a constant temperature device, and confirming that no light ends are shielded between all infrared transmitting tubes and all infrared receiving tubes;
step 2, adjusting the ambient temperature to enable the temperature of the infrared transmitting tube to reach the target working temperature;
step 3, the upper computer sends the current working temperature value and a calibration instruction to the infrared touch screen main controller;
step 4, the infrared touch screen main controller calibrates the temperature value acquired by the temperature sampling unit according to the received temperature value, and sets a DAC output voltage value by taking the room temperature parameter as a reference;
step 6, the master controller adjusts the DAC output voltage value and repeats the step 5;
and 7, storing the temperature data and the DAC output voltage into a nonvolatile memory by the infrared touch screen main control controller to form temperature compensation parameters at the target working temperature.
And (4) circularly trying the steps from the step 2 to the step 7, and then establishing a complete temperature compensation parameter table.
The working principle of the invention is as follows: the main controller reads the temperature of the infrared light-emitting diode through the temperature acquisition unit, calculates the driving voltage according to calibrated temperature compensation parameters stored in the nonvolatile memory, configures a DAC (digital-to-analog converter) to output a direct-current voltage value and outputs the direct-current voltage value through the power amplification circuit, and therefore temperature compensation of the emission intensity of the infrared light-emitting diode is completed.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (5)
1. A wide-temperature infrared touch device is characterized by comprising a main controller (1), a nonvolatile memory (2), an infrared emission driving circuit (3), an infrared receiving circuit (4) and a temperature sensing circuit (5); the main controller (1) is respectively connected with the nonvolatile memory (2), the infrared emission driving circuit (3), the infrared receiving circuit (4) and the temperature sensing circuit (5); the temperature sensing circuit (5) is used for sampling the temperature of the infrared light-emitting diode, converting the temperature into a digital signal and transmitting the digital signal to the main controller (1); the nonvolatile memory (2) is used for storing the temperature of the infrared light-emitting diode and the corresponding temperature compensation parameter; the infrared emission driving circuit (3) comprises a DAC (digital-to-analog converter), a power amplifying circuit, an infrared light emitting diode and a series current limiting resistor, and generates an infrared light signal under the control of the controller of the main controller (1); the infrared receiving circuit (4) comprises an ADC, a signal amplifying circuit and an infrared receiving diode, and converts received infrared light signals into electric signals and transmits the electric signals to the main controller (1).
2. A method for compensating for temperature in an infrared touch device as recited in claim 1, comprising the steps of:
step 1, a main controller controls a temperature sensing unit to collect the temperature of an infrared transmitting tube of an infrared touch screen;
step 2, the main controller queries a driving current control parameter table according to the sampled infrared LED temperature to obtain the address of the corresponding control parameter in the nonvolatile memory;
step 3, reading temperature compensation parameters by the main controller;
step 4, calculating and adjusting the driving current of the transmitting tube according to the temperature compensation parameters;
the four steps are recycled, so that the infrared touch screen meets the wide-temperature working requirement.
3. The method as claimed in claim 2, wherein the method of adjusting the driving current of the transmitting tube is implemented by adjusting the output voltage of the power operational amplifier through the DAC, thereby changing the voltage applied to the series current limiting resistor circuit of the infrared transmitting tube.
4. The method as claimed in claim 2, wherein the method for establishing the driving current control parameter table is to calibrate the temperature compensation parameter by using an upper computer and a constant temperature device, and comprises the following steps:
step 1, placing an infrared touch screen in a constant temperature device, and confirming that no light shielding exists between all infrared transmitting tubes and all infrared receiving tubes;
step 2, adjusting the ambient temperature to enable the temperature of the infrared transmitting tube to reach the target working temperature;
step 3, the upper computer sends the current working temperature value and a calibration instruction to the infrared touch screen main controller;
step 4, calibrating the temperature value acquired by the temperature sampling unit by the infrared touch screen main controller according to the received temperature value;
step 5, setting a DAC output voltage value by the main controller;
step 6, reading induced current of the infrared receiving tube by the infrared touch screen main controller, executing step 7 when the induced current is within a preset threshold range, and executing step 5 if the induced current is not within the preset threshold range;
and 7, storing the temperature data and the DAC output voltage into a nonvolatile memory by the infrared touch screen main control controller to form temperature compensation parameters at the target working temperature.
And (4) circularly trying the steps from the step 2 to the step 7, and then establishing a complete temperature compensation parameter table.
5. The method of claim 4 wherein in step (5) the DAC voltage level is adjusted by increasing the DAC output voltage level when the sensed current is less than a predetermined minimum threshold and decreasing the DAC output voltage level when the sensed current is greater than a predetermined maximum threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010577950.6A CN111813274A (en) | 2020-06-23 | 2020-06-23 | Wide-temperature infrared touch device and temperature compensation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010577950.6A CN111813274A (en) | 2020-06-23 | 2020-06-23 | Wide-temperature infrared touch device and temperature compensation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824445A (en) * | 2021-09-29 | 2021-12-21 | 天津津航计算技术研究所 | DAC output self-adaptive calibration method under wide temperature environment |
| CN113824444A (en) * | 2021-09-29 | 2021-12-21 | 天津津航计算技术研究所 | DAC output self-adaptive calibration device under wide temperature environment |
| CN113961102A (en) * | 2021-12-22 | 2022-01-21 | 上海艾为微电子技术有限公司 | Detection parameter determination method, distance detection system and electronic equipment |
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| US5355149A (en) * | 1992-05-27 | 1994-10-11 | Spacelabs Medical, Inc. | Scanning system for touch screen keyboards |
| CN103064563A (en) * | 2012-12-28 | 2013-04-24 | 北京汇冠触摸技术有限公司 | Signal processing and control method and signal processing and control device of infrared touch screen |
| CN103927989A (en) * | 2014-04-21 | 2014-07-16 | 中国电子科技集团公司第五十五研究所 | Passive organic light emitting diode (OLED) display device with wide-temperature brightness compensation function and brightness compensation method |
-
2020
- 2020-06-23 CN CN202010577950.6A patent/CN111813274A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355149A (en) * | 1992-05-27 | 1994-10-11 | Spacelabs Medical, Inc. | Scanning system for touch screen keyboards |
| CN103064563A (en) * | 2012-12-28 | 2013-04-24 | 北京汇冠触摸技术有限公司 | Signal processing and control method and signal processing and control device of infrared touch screen |
| CN103927989A (en) * | 2014-04-21 | 2014-07-16 | 中国电子科技集团公司第五十五研究所 | Passive organic light emitting diode (OLED) display device with wide-temperature brightness compensation function and brightness compensation method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824445A (en) * | 2021-09-29 | 2021-12-21 | 天津津航计算技术研究所 | DAC output self-adaptive calibration method under wide temperature environment |
| CN113824444A (en) * | 2021-09-29 | 2021-12-21 | 天津津航计算技术研究所 | DAC output self-adaptive calibration device under wide temperature environment |
| CN113824445B (en) * | 2021-09-29 | 2023-07-28 | 天津津航计算技术研究所 | DAC output self-adaptive calibration method in wide temperature environment |
| CN113824444B (en) * | 2021-09-29 | 2023-07-28 | 天津津航计算技术研究所 | DAC output self-adaptive calibration device under wide temperature environment |
| CN113961102A (en) * | 2021-12-22 | 2022-01-21 | 上海艾为微电子技术有限公司 | Detection parameter determination method, distance detection system and electronic equipment |
| CN113961102B (en) * | 2021-12-22 | 2022-06-17 | 上海艾为微电子技术有限公司 | Detection parameter determination method, distance detection system and electronic equipment |
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Application publication date: 20201023 |
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