Large-size high-resolution infrared touch screen based on ATmega88

An infrared touch screen, high-resolution technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problems of weak anti-light interference and poor anti-light interference

Inactive Publication Date: 2013-11-13
SHANXI YANTAO NETWORK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some foreign products can reach 4096×4096, but their ability to resist light interference is not strong
For large-screen displays used in some domestic industries, the domestic infrared touch screen technology cannot normally realize its touch and other functions, and the anti-light interference is even worse.

Method used

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  • Large-size high-resolution infrared touch screen based on ATmega88
  • Large-size high-resolution infrared touch screen based on ATmega88

Examples

Experimental program
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Effect test

Embodiment Construction

[0008] Design of Infrared Transmitting and Receiving Circuit

[0009] The infrared emitting and receiving tubes have been tested, and the medium 5mmPT series photodiodes and triodes of Everlight Company were selected respectively. The power transistor S8550 is used as a switch in the circuit. Wherein, the transmitting tube in the infrared transmitting circuit is an infrared emitting diode, and the receiving tube is a triode. Phototransistor is a photoelectric device developed on the basis of photodiode, which itself has the function of amplification. S8550 is a PNP transistor. When used as a switch, it works in two states of saturation and cut-off. It is equivalent to a non-contact switch controlled by the base signal. Its function corresponds to the "close" and "off" open".

[0010] The control part of the infrared receiving tube and the transmitting tube is completed by 74HC138 and 74HC238 chips. The infrared tubes distributed on the x-axis and y-axis are divided into gr...

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PUM

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Abstract

The invention provides a design and development scheme of a strong-light-interference-resistance high-resolution infrared touch screen. The output voltage changes of an infrared receiving circuit are precisely quantized through an AD (analog-digital) converter, so the output voltage changes are converted into corresponding changes of coordinates. 74HC138 and 74HC238 are adopted for flexibly controlling the whole circuit, compared with other schemes, the scheme has the advantages that the use quantity of elements is greatly reduced, the cost is reduced, and the performance is more stable. Through the hardware circuit design and the soft mode, the light interference resistance capability of the infrared touch screen is jointly improved.

Description

Technical field: [0001] mechanical field; electronic information field; Background technique: [0002] As a kind of touch technology, infrared touch screen is not affected by current, voltage and static electricity, and is suitable for harsh environmental conditions, so it has become the ultimate development trend of touch screen products. However, the traditional infrared touch screen has a very low resolution, which is often determined by the logarithm of its infrared tubes, so its resolution must be improved to meet the needs of various industries. On the other hand, since the infrared touch screen uses an infrared receiving tube as a sensor device, when it is used outdoors, if the intensity of sunlight in the environment is high, it will interfere with its normal operation. These defects have affected the application of infrared touch screen. [0003] With the advancement of science and technology, the infrared touch screen has also developed greatly. At present, the ...

Claims

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Application Information

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IPC IPC(8): G06F3/042
Inventor 王春涛
Owner SHANXI YANTAO NETWORK
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