Adjacent key suppression method of capacitive touch keys

Abstract

The invention discloses an adjacent key suppression method of capacitive touch keys. The method includes the following steps: acquiring current capacitance values of all keys, processing the acquired capacitance values of the keys, selecting the key with a maximum capacitance change value compared with a reference capacitance value and the like. By retaining the keys with capacitance change values reaching a touch judging threshold value and selecting the key with the maximum capacitance change value compared with the reference capacitance value as a final retaining key, true key value generated by touching is judged, mistaken triggering of surrounding keys caused by interferences is suppressed, and a function of adjacent key suppression is realized.

Description

technical field [0001] The invention relates to the technical field of a method for suppressing adjacent keys of a touch key, in particular to a method for suppressing adjacent keys of a capacitive touch key. Background technique [0002] Since the capacitive touch screen can be sensed by light touch, it is easy to use, and the contact between the finger and the touch screen is almost wear-free, and the performance is stable, so the capacitive touch screen has been widely used in various electronic devices. [0003] At present, for the capacitive touch keys in the existing capacitive touch screen, the usual touch detection method is to count the capacitance change caused by the touch, and then compare it with the original capacitance when no touch occurs. If the change range or ratio is determined, it is determined that the touch has occurred. The specific process is as follows: figure 1 As shown, when no touch occurs, the capacitance measured by each button is a relatively...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, due to the close spacing of the keys, when a key is touched, the adjacent keys may be affected by the coupling capacitance of the human body, which will cause changes in the capacitance measurement value. It is also possible that the problem partially touches an adjacent key, causing a change in the capacitance value of the adjacent key, such as figure 2 shown

[0005] However, in applications that require relatively high touch sensitivity, adjacent keys are affected by the above, and there may be more than one key that meets the touch determination threshold, resulting in difficulties in touch determination and false triggering of keys, such as image 3 shown

Therefore, in the application field where the keys are densely distributed or where the touch sensitivity is relatively high, since the distance between the keys is too small, and the size of the finger and the touch precision are quite different, the The detection of adjacent keys causes certain interference, and even causes false triggering

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