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FPC‐free LCD panel with capacitive coupling for transmission of signals and power
Author(s) -
Furuta Futoshi,
Kageyama Hiroshi,
Takei Ken,
Hatano Mutsuko,
Matsumoto Katsumi,
Maki Masahiro,
Miyazawa Toshio
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.6.454
Subject(s) - liquid crystal display , capacitive sensing , capacitive coupling , capacitance , materials science , signal (programming language) , power (physics) , electrical engineering , waveform , capacitor , electronic engineering , computer science , optoelectronics , electrode , engineering , voltage , physics , quantum mechanics , programming language
— A flexible‐printed‐cable (FPC) free liquid‐crystal‐display (LCD) panel by using a capacitive‐coupling technique has been developed. A QQVGAeight‐color image was successfully displayed for the first time without attaching any signal or power cables to the panel. The receiving circuitry and capacitive‐coupling electrodes were integrated on the LCD panel using a low‐temperature polysilicon (LTPS) fabrication process. In the proposed digital coding method, the receiving circuit converts derivative waveform signals via the capacitive coupling to conventional logic‐level signals. The maximum data rate of 2.4‐Mbps × 3ch (RGB) was achieved. In addition, LTPS low‐capacitance diode bridge and regulator enabled us to obtain stable DC power of 2.4 mW on the panel from the AC‐power signal. This study is the first step towards integrating the wireless‐communication function on the display panel to achieve a high‐value‐added flat‐panel display (FPD).