Infrared touch screen and locating method thereof

Abstract

The invention discloses an infrared touch screen and a locating method thereof. The infrared touch screen comprises a touch panel, a circuit board, a plurality of infrared emission light tubes and a plurality of infrared receiving light tubes, wherein the circuit board is arranged on the lower side of the touch panel; the infrared emission light tubes and the infrared receiving light tubes are arranged correspondingly one to one and are electrically connected with the circuit board; a first light path reflection device and a second light path reflection device are respectively arranged on the two corresponding sides around the touch panel; the first light path reflection device is used for receiving infrared light emitted by the infrared emission light tubes and reflecting the infrared light to the upper side of the touch panel; the second light path reflection device is used for receiving the infrared light reflected to the upper side of the touch panel and reflecting the infrared light to the lower side of the touch panel, so that the infrared light is received by the infrared receiving light tubes. According to the embodiment, the infrared emission light tubes and the infrared receiving light tubes are arranged on the lower side of the touch panel, so that most or all of original light path sparse areas or non-light path dead areas are gathered on the lower side of the touch panel, the width of an outer frame of the whole infrared touch screen or a silk-screen black edge of glass can be reduced or disappear greatly, and a touchable area of the infrared touch screen is enlarged effectively.

Description

technical field [0001] The invention relates to the field of touch technology, in particular to an infrared touch screen and a positioning method thereof. Background technique [0002] A touchscreen is an electronic system that can detect the presence and location of a touch within the display area. In the current touch technology, the infrared touch screen has been widely used due to its advantages such as strong environmental adaptability, long life and many identifiable touch points. [0003] At present, the commonly used infrared touch screen is a rectangular infrared touch screen, and its basic structure is as follows: figure 1 Shown, comprise MCU (Microprogrammed Control Unit, microprogram controller) or CPU (Central Processing Unit, central processing unit), touch panel 3 and the aluminum frame 4 that is arranged around touch panel 3, and described aluminum frame 4 is arranged on the The upper side of the touch panel 3, wherein the touch panel 3 is a transparent pan...

AI Technical Summary

Problems solved by technology

[0005] However, if figure 2 As shown, in the 1-to-n scanning mode, the overall touch frame of the infrared touch screen is divided into dense optical path area (A area), sparse optical path area (B area) and no optical path dead area (C area). Sparse or no optical path in the dead zone of the optical path leads to low touch accuracy. In order to ensure the touch accuracy of the infrared touch screen, in the above infrared touch screen structure, the only way to improve the touch accuracy is to increase the frame width of the infrared touch screen or increase the black border of the glass silk screen. , That is to say, the outer frame of the infrared touch screen or the black border of the glass silk screen covers the sparse optical path area and the dead area without optical path, so that the sparse optical path area and the dead area without optical path cannot be touched, thus resulting in the outer frame width of the infrared touch screen or the black screen printing of the glass The width of the side is relatively large (generally greater than 20mm), and the touchable area for actual operation in the infrared touch screen is relatively small

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