Keyboard device

Abstract

The present invention discloses a keyboard device comprising M drive circuits, N transconductance circuit control modules, M column signal lines, N line signal lines and M * N key units. The control module scans the M column signal lines in M scan cycles. In the N key units, when the key unit at the intersection of the column signal line located at the k-th column and the x-th line signal line is pressed, the switch included in the key unit transmits the scan voltage on the column signal line to the line signal line The The transposed circuit connected to the line signal line changes the generated output voltage depending on whether or not it is turned on. The control module determines whether the key unit is pressed according to the potential of the output voltage. According to the present invention, it is possible to accurately determine the pressing state of the key unit located in the same column in each scanning cycle, and to effectively avoid the generation of the ghost key phenomenon, thereby improving the accuracy of judging the pressing state of the key unit.

Description

technical field [0001] The invention relates to a keyboard device, and in particular to a keyboard device with an anti-ghost key function. Background technique [0002] In order to avoid increasing the manufacturing cost due to excessive wiring, and considering the convenience of assembly, many keyboards currently adopt a keyboard matrix structure. Such keyboards may have ghost keys (GhostKey). [0003] Please refer to Figure 1A ~ Figure 1D , which shows a schematic diagram of ghost bond occurrence. The button matrix here sets four button units KU(1,1), KU(1,2), KU(2,1), KU(2,2) on two column signal lines C(1), C (2) Four intersections formed by two row signal lines R(1) and R(2). The key unit KU(1,1) is located in the first row and the first column, the key unit KU(1,2) is located in the second row and the first column, the key unit KU(2,1) is located in the first row and the second column, the key unit KU(2,2) is located in the second row and second column. Wherein, ...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the keyboard controller targets Figure 1A ~ Figure 1D The result judged by any one of the pressing conditions may be mistaken for a button that has not been pressed (that is, a misjudgment Figure 1A The key unit KU(1,1), Figure 1B The key unit KU(1,2), Figure 1C The key unit KU(2,1), Figure 1D The key unit KU(2,2)) is pressed, resulting in misjudgment, which is the ghost key phenomenon

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