An infrared touch screen

Abstract

Disclosed is an infrared touchscreen, which relates to the technical field of touch control and is designed for solving the edge corner effect of a touchscreen. The infrared touchscreen in the present invention includes an infrared emission element array, an infrared receiving element array, a first edge, a second edge, a third edge and a fourth edge, wherein the first edge is opposite to the third edge, the second edge is opposite to the fourth edge, the infrared emission element array and the infrared receiving element array are located on the first edge and the third edge respectively, and the second edge and the fourth edge are provided with a reflection element for reflecting light beams incident to the second edge and the fourth edge to the third edge respectively. Through the reflection of a reflection element, the scanning line density of an edge corner area can be increased, thereby improving the edge corner effect.

Description

technical field [0001] The invention relates to the technical field of touch control, in particular to an infrared touch screen. Background technique [0002] With the development of multimedia technology, touch control technology has become a hot technology in today's human-computer interaction. The way of human-computer interaction (such as keyboard, mouse, etc.) of many products is gradually replaced by touch control technology. Among many touch technologies, infrared touch screens are used in many occasions due to their simple structure and low cost. Existing infrared touch screens generally include an array of infrared emitting elements and an infrared receiving element installed on a printed circuit board around the touch panel. The element array, the light between the infrared emitting element array and the infrared receiving element array forms a dense scan line network on the touch panel, and the touch panel is identified by detecting the occlusion of the scanning ...

AI Technical Summary

Problems solved by technology

However, in this one-to-many scanning method, due to the limitation of the size of the touch screen (impossible to be infinite), only a part of the scanning lines can be scanned for the infrared emitting elements near the corners, such as image 3 , if the width that can be scanned for an infrared emitting element itself is B~D, but because the infrared emitting element A is located near the corner, it can only scan the infrared receiving element located in the width range of B~C, and C~D are located in the touch detection area In addition, there is no infrared receiving element installed, so it cannot scan, so the scanning lines in the corner area of ​​the touch screen are less than those in the center area, this phenomenon is called "corner effect".

figure 1 Among them, for the two infrared emitting elements at the left and right ends, only three scan lines located in the touch detection area can be scanned. When the touch object 103 is located figure 1 In the corner area, the specific position of the touch object will not be recognized, so the touch effect in the corner area will be relatively poor, and the touch object may not be recognized in serious cases, especially for large-sized infrared touch screens, there will be more at both ends. The number of scanning lines of the more emitting elements is less than that of the infrared emitting elements in the middle, so the corner effect is more obvious

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