Method for detecting touch points on a touch screen

Abstract

The invention relates to a method for detecting a touch point on a touch panel. The touch panel is provided with a conductive with impedance anisotropy, wherein the conductive film have a low impedance direction and a high impedance direction vertical to each other; the conductive film is provided with a plurality of driving electrode couples along the low impedance direction, each driving electrode couple comprises at least one first driving electrode and at least one second driving electrode which are oppositely arranged along two opposite side edges of the conductive film. The method comprises the following steps: scanning the plurality of driving electrode couples in the high impedance direction to obtain an electrical signal curve, and judging the coordinate position of the touch point in the high impedance direction according to the electrical signal curve; sensing a first electrical signal between multiple first driving electrodes adjacent to the coordinate of the touch point in the high impedance direction of the conductive film and the touch point; sensing a second electrical signal between multiple second driving electrodes adjacent to the coordinate of the touch point in the high impedance direction of the conductive film and the touch point; and judging the coordinate of the touch point in the low impedance direction according to the ratio of the first electrical signal to the second electrical signal.

Description

technical field [0001] The invention relates to a detection method of a touch point on a touch screen, in particular to a detection method based on a surface capacitive touch screen touch point. Background technique [0002] In recent years, along with the high performance and diversification of various electronic devices such as mobile phones and touch navigation systems, the number of electronic devices in which a light-transmitting touch panel is mounted on the front of a display device such as a liquid crystal is increasing. Users of such electronic devices use the touch screen to visually confirm the display content of the display device located on the back of the touch screen, while pressing the touch screen with a finger or a pen to perform operations. Thereby, various functions of the electronic device can be operated. [0003] According to different working principles and transmission media of touch screens, existing touch screens are divided into four types, namel...

AI Technical Summary

Problems solved by technology

However, in the above method, since it is necessary to scan all the electrodes, it takes a long time to sense the touch point, and the response time of the touch screen is relatively slow.

In addition, since the resistance between the touch point and the electrode is relatively large, the touch accuracy needs to be improved.

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