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A study on Detecting a Ghost-key using Additional Coating at the Membrane type Keyboard)
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 Title & Authors
A study on Detecting a Ghost-key using Additional Coating at the Membrane type Keyboard)
Lee, HyunChang; Lee, MyungSeok;
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 Abstract
This paper presents a novel method for detecting a ghost key at the membrane type keyboard, which has additional resistive coating to the membrane film. Also, the optimal ratio of resistances for detecting a ghost key was designed based on the characteristics of the membrane film. The optimal ratio of resistances was considered to be able to detect the worst case (i.e., difference voltage between normal key and ghost key is minimum). The ability of the proposed methods are evaluated by simulation studies in this paper. In order to verify the proposed method, the experiment was carried out with a designed circuit and A/D (analog to digital) in MCU (micro controller unit). The proposed method is implemented into the membrane type keyboard and is verified by experimental results.
 Keywords
phantom key;ghost key;membrane;keyboard;dynamic scanning;
 Language
Korean
 Cited by
 References
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