detection circuit

Abstract

The application discloses a detection circuit, which includes a column line, a row line, a switch component, a capacitor and a processing unit. The switch components are respectively disposed between the corresponding column lines and the corresponding row lines. The corresponding column and row lines are in electrical contact with each other when the switch assembly is pressed. Capacitors are respectively arranged at one end of each column line. The processing unit is electrically connected to one end of the column line provided with a capacitor and one end of the row line, and is used for sequentially outputting the scan signal to each row line. When one of the row lines sends a scan signal and detects that the first column line receives the scan signal, the processing unit judges whether a corresponding first switch component is turned on according to the charging time of the capacitor corresponding to the first column line, and the first switch The components correspond to one row of lines and the first column of lines. The keyboard keys of this application can be arranged arbitrarily without special design, and can effectively judge whether ghost keys are generated, and realize multi-key simultaneous pressing technology.

Description

technical field [0001] The present application relates to a detection circuit, in particular to a circuit and method capable of detecting keyboard ghost keys. Background technique [0002] A general computer keyboard or telephone keyboard is usually composed of a matrix formed by multiple scan lines and multiple return lines. When the user presses a key on the keyboard, the corresponding scan lines and return lines will Sexual contact to form a circuit, and by detecting the voltage difference of each group of circuits, it can be known whether the button is pressed. However, when three buttons are pressed at the same time, if the three buttons form a 2×2 matrix, the corresponding two scan lines and the two scan lines will form four groups of loops, and the system will misjudge that four buttons are simultaneously pressed. Depress, wherein, the misjudged fourth button is called ghost key (ghostkey). [0003] In the manufacture of traditional keyboards, keyboard keys must be ...

AI Technical Summary

Problems solved by technology

[0003] In the manufacture of traditional keyboards, keyboard keys must be deliberately arranged to prevent ghost keys from possible combination keys, which will lengthen and complicate the wiring of the overall keyboard, and cause disadvantages such as an increase in line impedance

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