Touch screen object off-screen detection method

Abstract

The present invention discloses a method for detecting off-screen objects on a touch screen, comprising: step S1, acquiring signals received by each receiving light from each optical path, and detecting the unblocked cross-sectional area of ​​the optical path through the received signal; step S2, acquiring the shape of each optical path and the shape of the touching object, build a model with the occluded section through the shape of the optical path and the shape of the touching object; the model combines the unoccluded cross-sectional area, the shape of each optical path, the shape of the touching object, and the height value of the touching object from the screen Correlation; step S3, obtain the height value in the model through the unoccluded cross-sectional area and the established model, and the height value is the height of the touch object from the screen. The off-screen detection method of the touch screen object proposed by the present invention can obtain the distance between the touch screen object and the touch screen more accurately, and avoid misidentification of some touch operations.

Description

technical field [0001] The invention belongs to the technical field of touch screens, and relates to a method for detecting a touch screen object leaving the screen. Background technique [0002] The light is emitted from the emitting lamp to the receiving lamp. We call the path that this beam of light passes through as the light path. If the shape of the emitting lamp and the receiving lamp is a circular colloid, then the shape of this light path is a cylinder. If the emitting lamp and If the shape of the receiving lamp is elliptical, then the shape of this light path is a cylinder with an elliptical cross-section, and the other shapes are the same. [0003] A conventional touch screen based on light path detection (also called grating) is covered with light paths in various directions on the screen surface. The relative positional relationship between these light paths is adjacent, intersecting, or partially overlapping. Neighboring, etc., usually to detect whether there ...

AI Technical Summary

Problems solved by technology

[0004] However, ordinary touch screens usually have a problem of lifting the height of objects. Due to structural limitations, the emitting lights and infrared lights are arranged on the surface around the touch screen. Therefore, when the touch screen detects an object, the object does not really touch the screen at zero distance. Surface, and this problem can cause false recognition in some touch operations

[0005] However, the current touch screen cannot detect the suspended distance of the object from the screen, which is also the shortcoming of the current ordinary touch screen

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