A kind of touch screen scanning method

Abstract

The invention discloses a touch screen scanning method, and belongs to the touch screen scanning technology. The method includes the following steps that 1, the whole-screen region of a touch screen is divided into region blocks of a certain size; 2, the partition where a touch point is located is determined, wherein the first step of determining a first partition and the second step of determining a second partition are carried out; 3, all light paths penetrating through the second partition are scanned to determine the touch point. According to the step 2, in the first step of determining the first partition, all light paths perpendicular to one side of the touch screen are scanned, the region where the scanned touch point is located in the scanning direction is the first partition, and the first partition is a region bar formed by a plurality of region blocks in the direction perpendicular to one side of the touch screen; in the second step of determining the second partition, light paths forming an inclination angle alpha with one side of the touch screen are scanned, the scanning range covers light paths penetrating through the region bar, and the region block where the touch point is located is determined as the second partition. By means of the method, the number of light paths needing to be scanned for recognizing the touch point is effectively reduced, so that time consumed for scanning the light paths is shortened, and the frame rate of the touch screen is increased.

Description

technical field [0001] The invention relates to touch screen scanning technology, in particular to a touch screen scanning method. Background technique [0002] At any point on the infrared touch multi-point touch screen, there are 2 or more light paths with different angles covering the touch area, so once there is an obstruction at this point, n light paths will intersect to form a point in this area. This is the basic theory of infrared multi-point recognition. [0003] A conventional infrared touch screen needs hundreds or even thousands of light paths to cover and superimpose all the touch areas. The larger the touch area, the more light paths are needed. After the touch screen scans all the light paths at one time, it is usually called a frame, and the scanning Each optical path takes a certain amount of time. The more optical paths, the longer it takes to scan a frame, and the lower the frame rate of the touch screen. The scanning time consumption of each optical pa...

AI Technical Summary

Problems solved by technology

like Figure 1-2 As shown, the scanning method needs to determine the area where the logical touch point is located by scanning all the optical paths on both sides of the orthogonal, and then determine the position of the touch point by performing multi-angle oblique scanning on the area where the logical touch point is located. There are too many optical paths required to scan the point, which takes a long time, which makes the frame rate of the touch screen lower

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