Optical touch device and method as well as touch display device and method

Abstract

The invention provides an optical touch device and method as well as a touch display device and method. The optical touch device comprises multiple photosensors, detection light sources, a control unit and a subtractor, wherein the multiple photosensors are alternately started and shut and are continuously started twice and shut twice as one detection period; the detection light sources are alternately started and shut; the control unit controls the start and shut of the photosensors and the detection light sources, so that the photosensors detect interference lights during the first start in each detection period and detect the sum of detection lights and interference lights during the second start; and the subtractor is used for subtracting signals detected by the photosensors during the second start in each detection period from signals detected by the photosensors during the first start in each detection period. The touch display device has the advantages that the structure is simple, the cost is low, and no matter whether the interference lights are stronger interference lights or not, touch display can be accurately carried out.

Description

technical field [0001] The present invention relates to the technical field of touch display, and in particular, to an optical touch device and method, and a touch display device and method. Background technique [0002] With the continuous development and progress of science and technology, various display systems are widely used in daily life. With the increasing improvement of living standards, people are no longer satisfied with passively accepting the information provided by the display system. In recent years, a series of products such as touch LCD screens and IPADs have been developed. The display systems of these products are equipped with touch screens, which can display information. The functions of display and information input are integrated together to form a convenient and fast way of human-computer interaction. [0003] The touch screen integrated on the display system is usually used to detect the touch position of a finger (or an electronic pen) on the touc...

AI Technical Summary

Problems solved by technology

[0014] The problem solved by the present invention is that the optical touch screen in the prior art cannot accurately perform touch detection under strong interference light, so the present invention provides an optical touch device and method, a touch display device and method that are not affected by interference light

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