keyboard

Abstract

The invention relates to a keyboard, and the keyboard comprises a plurality of keys, a supporting plate and a thin film switch circuit. The membrane switch circuit comprises a first upper key switch and a first lower key switch. The first upper key switch can output first key information corresponding to a key when being triggered by a key. The first lower key switch can output second key information corresponding to the key when being triggered by the key. The control unit is connected to the thin film switch circuit and can output corresponding key signals according to the received first keyinformation and second key information. When the control unit only receives the first key information or the second key information, the control unit does not output the key signal. According to thekeyboard, ghost keys can be avoided.

Description

technical field [0001] The invention relates to a keyboard, in particular to a keyboard including a membrane switch circuit. Background technique [0002] Common computer peripheral input devices include a mouse, a keyboard, and a trackball. The keyboard can directly input text and symbols to the computer, so it is highly valued by users and input device manufacturers. Among them, the more common one is a keyboard that includes a scissor-type connecting element. [0003] Next, the architecture of the keyboard including the scissor connection elements is described. see figure 1 , which is a structural cross-sectional schematic diagram of an existing keyboard. The existing keyboard 1 includes a plurality of keys 10 , a membrane switch circuit 11 and a support plate 12 , and each key 10 includes a key cap 101 , a scissor-type connection element 102 and an elastic element 103 . In the key 10, the key cap 101 is exposed outside the existing keyboard 1 and can be touched by th...

AI Technical Summary

Problems solved by technology

However, the method of arranging a diode near each key contact has the following disadvantages: first, the cost of the diode is high, and this method will lead to an increase in the cost of the keyboard

Second, arranging multiple diodes on the membrane switch circuit will increase the thickness of the membrane switch circuit, which is not conducive to the thinning of the keyboard

Third, in this method, diodes must be welded near each button contact, and the process is too complicated

This practice creates an excessive number of output lines that are difficult to configure

For example: the keyboard contains 144 keys, this method will have 144 output lines, so it is difficult for the manufacturer to arrange a large number of output circuit configurations

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