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Wide-temperature infrared touch device and temperature compensation method thereof

A technology of infrared touch and temperature compensation, applied in the direction of instruments, electrical digital data processing, data processing input/output process, etc., can solve the problem of infrared touch screen touch performance degradation

Inactive Publication Date: 2020-10-23
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to design an infrared touch device that works at a wide temperature and to invent a corresponding temperature compensation method for the problem that the touch performance of the infrared touch screen decreases at low temperature

Method used

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  • Wide-temperature infrared touch device and temperature compensation method thereof
  • Wide-temperature infrared touch device and temperature compensation method thereof
  • Wide-temperature infrared touch device and temperature compensation method thereof

Examples

Experimental program
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Embodiment 1

[0037] Such as figure 1 , 4 shown.

[0038] A wide-temperature infrared touch device includes a main controller 1, a non-volatile 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 non-volatile memory 2, the infrared emission driving circuit 3, the infrared receiving circuit 4 and the temperature sensing circuit 5, and the temperature sensing circuit 5 is used for sampling the temperature of the infrared light-emitting diode And convert it into a digital signal and transmit it to the main controller 1. The non-volatile memory 2 is used to store the temperature of the infrared light emitting diode and the corresponding temperature compensation parameters. The infrared emission drive circuit 3 includes a DAC, a power amplifier circuit, an infrared light emitting diode The diode and the series current-limiting resistor generate an infrared light signal u...

Embodiment 2

[0041] Such as figure 2 and image 3 shown.

[0042] A temperature compensation method for an infrared touch device, such as figure 2 As shown, it includes the following steps:

[0043] Step 1. The main controller controls the temperature sensing unit to collect the temperature of the infrared emission tube of the infrared touch screen;

[0044] Step 2, the main controller queries the driving current control parameter table according to the sampled infrared LED temperature to obtain the address of the corresponding control parameter in the non-volatile memory;

[0045] Step 3, the main controller reads the temperature compensation parameters;

[0046] Step 4, adjusting the driving current of the transmitting tube according to the temperature compensation parameter;

[0047] The above four steps are used cyclically to make the infrared touch screen meet the wide temperature working requirements.

[0048] Such as image 3 As shown, the temperature compensation parameter...

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Abstract

The invention discloses a wide-temperature infrared touch device and a brightness compensation method. The wide-temperature infrared touch device comprises a main controller, a nonvolatile memory, aninfrared emission driving circuit, an infrared receiving circuit and a temperature sensing circuit. The main controller reads the temperature of the infrared light-emitting diode through a temperatureacquisition unit, calculates driving voltage according to calibrated temperature compensation parameters stored in the nonvolatile memory, configures a DAC output direct-current voltage value and outputs the direct-current voltage value through a power amplification circuit, so that temperature compensation of the emission intensity of the infrared light-emitting diode is completed. According tothe wide-temperature infrared touch device, the problem that the performance change of the infrared transmitting tube caused by temperature change affects the intensity and dependence of an optical signal can be effectively eliminated, so that the application requirement under a severe environment temperature condition is met.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to an infrared touch technology, in particular to a wide temperature infrared touch device and a temperature compensation method thereof. Background technique [0002] Infrared Touch is a touch technology that detects touch actions by detecting infrared light blocking. Specifically, it is composed of infrared emitting and receiving sensing elements installed on the outer frame of the touch screen. These elements form an infrared detection network on the surface of the screen. Responses to operations based on coordinate positions. It has the characteristics of high light transmission, no intermediate medium, long service life, no force required for touch, and no special requirements for the touch body. [0003] However, when applied under harsh environmental conditions, especially at low temperatures, because the forward voltage drop of the infrared emitting tube becomes la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042G06F3/041
CPCG06F3/042G06F3/0418
Inventor 章鹏赵钱沈骝严秋白曹允田冲
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD