Method for detecting departure of touch screen object from touch screen

Abstract

The invention discloses a method for detecting a departure of a touch screen object from a touch screen. The method comprises: step S1: obtaining signals received by each receiving lamp from each optical path, and detecting an unobstructed cross sectional area of the optical paths through the received signals; step S2, obtaining the shape of each optical path and the shape of the touch object, andestablishing a model whose cross section is obstructed by the shape of the optical path and the shape of the touch object; and the unobstructed cross sectional area, the shape of each optical path, the shape of the touch object, the height value of the touch object from the screen is associated by the model; and step 3, obtaining a height value in the model by an unobstructed cross sectional areaand the established model, wherein the height value is the height of the touch object from the screen. According to the method for detecting the departure of the touch screen object from the touch screen, the distance of the touch screen object from the touch screen can be obtained relatively accurately, so that the misidentification of some touch operations can be avoided.

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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