Optical touch screen

Abstract

The invention provides an optical touch screen. The optical touch screen comprises an optical reflecting plate, a display screen, a detection control circuit and at least one pair of optical transmitting head and optical receiving head, wherein the optical reflecting plate is arranged above the display screen; the optical transmitting head in each pair is arranged on one side of the optical reflecting plate according to an angle at which incident light can be fully reflected inside the optical reflecting plate; the optical receiving head in each pair is arranged on the opposite side of the optical reflecting plate according to an angle at which the incident light can be received; and the detection control circuit is connected with each pair of optical transmitting head and optical receiving head and is used for detecting light change between each pair of optical transmitting head and optical receiving head. The optical touch screen can achieve more sensitive touch detection and improves the touch experience of a user; anti-jamming anti-dust performance of the optical transmitting head and the optical receiving head is effectively improved; and the service life of the optical touch screen is greatly prolonged.

Description

[0001] technical field [0002] The invention relates to the field of touch screens, in particular to an optical touch screen using light for positioning. [0003] Background technique [0004] The infrared touch screen uses the dense infrared matrix in the X and Y directions to detect and locate the user's touch. The infrared touch screen installs a circuit board frame in front of the display, and the circuit board is arranged on the four sides of the screen with one-to-one corresponding infrared emitting tubes and infrared receiving tubes, correspondingly forming a horizontal and vertical crossing infrared matrix. When the user touches the screen, the finger will block the horizontal and vertical infrared rays passing through the position, and the detection control circuit will detect the loss of light, and then confirm the X-axis and Y-axis coordinates of the touch point to determine the touch point position on the screen. [0005] However, only when the touch point is...

AI Technical Summary

Problems solved by technology

[0005] However, only when the touch point is touched so that the transmission direction of the infrared ray deviates from the original transmission direction reaches the degree that the detection control circuit can recognize (the infrared light emitted by the infrared emitting tube has only a very small part of the incident to the corresponding infrared receiver. tube or cannot be incident on the infrared receiving tube at all), and the touch action can be recognized. The structural characteristics of the infrared touch screen determine that to recognize the touch action, when the finger touches the touch screen, it is bound to be pressed relatively vigorously and completely. Obviously, this touch method reduces the user's touch experience

In addition, due to the need to press the area to be touched vigorously and completely, each touch will cause greater deformation and damage to the touch screen, thereby reducing the service life of the touch screen

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