A Study on the Method of Detecting the Ghost-Key Phenomenon of Rubber Contact Switch Type Remote Controller for the Smart-TV

  • Authors

    • Sung-Yeol Kwon
    • Hyun-Chang Lee
    https://doi.org/10.14419/ijet.v7i3.24.22526
  • Ghost-key, phantom-key, dynamic scan, rubber contact, remote controller, smart-TV

  • Background/Objectives: In this paper, ghost-key phenomenon detection method was proposed for rubber contact switch type remote controller of smart-TV.

    Methods/Statistical analysis: The principle of ghost-key phenomenon is analyzed when the switches are pressed simultaneously. The requirements of pull-up resistor ratio are obtained by case study with a circuit modeling. The proposed method is an optimized design that the switch has the greatest voltage difference between the normal state and the ghost-key state.

    Findings: In order to verify the proposed method, a remote controller with a rubber contact switch and a microcontroller were set up and tested based on theoretical values. The performance of proposed method was verified that the voltage is apparently distinguishes between normal state and ghost-key state. As a result, analog-to-digital conversion of the microcontroller can be used to detect and remove the ghost-key.

    Improvements/Applications: The proposed method can overcome limitations of other equipment with rubber contact switch. Therefore, the application range of rubber contact switch is expected to be expanded.

     

  • References

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  • How to Cite

    Kwon, S.-Y., & Lee, H.-C. (2018). A Study on the Method of Detecting the Ghost-Key Phenomenon of Rubber Contact Switch Type Remote Controller for the Smart-TV. International Journal of Engineering & Technology, 7(3.24), 153-157. https://doi.org/10.14419/ijet.v7i3.24.22526