Membrane keyboard with full-key rollover and special backlighting

Abstract

The invention discloses a membrane keyboard with all-key conflict-free and special backlight functions. The membrane keyboard comprises a membrane circuit layer, a membrane distance piece layer and a PCB (printed circuit board) which are sequentially arranged from top to bottom. Column circuits of a matrix circuit and a plurality of upper contacts are arranged on the lower surface of the membrane circuit layer, the upper contacts are positioned on the column circuits, line circuits of the matrix circuit and a plurality of lower contacts are arranged on the upper surface of the PCB, the lower contacts are positioned on the line circuits, diodes of an isolating keying circuit and LED elements are arranged on the lower surface of the PCB, the upper contacts and the lower contacts correspond to one another and form membrane switches, and through holes which correspond to the upper contacts and the lower contacts are formed in the membrane distance piece layer. The membrane keyboard has the advantages that the membrane keyboard is simple in structure and low in production cost, backlight can be emitted for optional specified keys, and the membrane keyboard can be widely applied to the field of keyboards.

Description

technical field [0001] The invention relates to a thin-film keyboard with full-key no-backlash and special backlight functions. Background technique [0002] Along with the development of computer, the updating and upgrading of computer software, entertainment with computer games has become an indispensable item for people to use computers. In most computer games now, there are often situations where game characters fight while walking. It requires the player to hold down the arrow keys while holding down other keys such as fighting. The keyboards in the prior art are generally arranged in a matrix, and the keys will affect each other. The general keyboard can only support any two keys to be pressed at the same time. If three keys are pressed at the same time, and the three keys are just formed in the matrix In the case of a right-angled triangle, because the three keys form a path, the keyboard will not be able to determine which keys are pressed. In order to solve this p...

AI Technical Summary

Problems solved by technology

The keyboards in the prior art are generally arranged in a matrix, and the keys will affect each other. The general keyboard can only support any two keys to be pressed at the same time. If three keys are pressed at the same time, and the three keys are just formed in the matrix In the case of a right-angled triangle, because the three keys form a path, the keyboard will not be able to determine which keys are pressed

In order to solve this problem, it is feasible to connect diodes in series in the key switch to isolate the influence of the keys from each other. This is a mature technology that is widely used in mechanical key keyboards with multi-key or full-key no punching, but the matrix of the membrane keyboard The circuit is thin-film, and it is difficult to solder the diodes, so the thin-film keyboard does not have a mature technology to realize multi-key or full-key no punch, which leads to the need to use a mechanical keyboard if you need a multi-key or full-key no punch keyboard, but the mechanical keyboard Not only is the cost very high and it is difficult to popularize, but at the same time, some users often want to use the backlight to highlight some temporarily designated keys for easy identification and prevent misuse. Although the keyboard also has a backlight function, it can basically only realize that all keys have a backlight or turn off the backlight, and it is difficult to realize the function that any specified key has a backlight, and other keys can turn off the backlight

[0003] To sum up, the existing film keyboard products are difficult to meet the requirements of users, and there are certain deficiencies

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