Keyboard scanning method and keyboard adopting same

Abstract

A scanning method for a keyboard includes steps (A), (B), (C) and (D). In step (A), a controller is configured to disable each column line from a respective first resistor and to disable each row line from a respective second resistor, and to send a scan signal to a column line. In step (B), the controller is configured to enable one of the row lines with the respective second resistor, and to read a signal on the row line. In step (C), the controller is configured to repeat step (B) with another one of the row lines until all row lines have been read. In step (D), the controller is configured to repeat steps (A), (B), and (C) with another one of the column lines until all column lines have been scanned.

Description

technical field [0001] The invention relates to a scanning method, in particular to a keyboard scanning method. Background technique [0002] In order to reduce the loop impedance of membrane keyboards currently on the market, most of the conductors on the membrane circuit use silver wires, but the price of silver is getting higher and higher. Carbon powder (carbon) printing forms thin-film circuits to replace the above-mentioned thin-film circuits using silver powder wires. [0003] see figure 1 Shown is a schematic circuit diagram of a conventional membrane keyboard 1 , which mainly includes a controller 11 , a membrane circuit board 12 electrically connected to the controller 11 and a plurality of keys 13 . The thin film circuit board 12 is provided with a plurality of row lines (scanning lines) P0.0-P0.7 and a plurality of column lines (return lines) P1.0-P1.7 printed with carbon powder and arranged in a staggered matrix. The buttons 13 are correspondingly arranged at...

AI Technical Summary

Problems solved by technology

[0008] This shows that above-mentioned existing membrane type keyboard obviously still has inconvenience and defect in structure and use, and urgently needs to be further improved

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