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Pixel having an organic light emitting diode and method of fabricating the pixel

  • US 10,163,996 B2
  • Filed: 01/11/2017
  • Issued: 12/25/2018
  • Est. Priority Date: 02/24/2003
  • Status: Active Grant
First Claim
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1. A pixel having a vertical architecture, comprising:

  • an organic light emitting diode (OLED) device having a bottom electrode, one or more OLED layers and a transparent top electrode for emitting light;

    a thin-film transistor (TFT) based backplane for electrically driving the OLED device, the TFT based backplane being vertically integrated with the OLED layers and located below said bottom electrode to form a top-emitting OLED, the TFT based backplane comprising;

    source and drain nodes; and

    a thin conductive contact plate formed entirely on a flat portion of the pixel area and electrically coupled to a source or drain node, the thin conductive contact plate defined by a top surface, a bottom surface, and side surfaces, its vertical dimension defined by the top and bottom surfaces substantially smaller than its horizontal dimensions defined by the side surfaces;

    a planarization dielectric layer provided between the TFT based backplane and the OLED bottom electrode so as to planarize the vertical profile on the TFT based backplane, said planarization dielectric layer being in direct contact with both said TFT based backplane and said OLED bottom electrode;

    a via in said planarization dielectric layer to provide a communication path between said TFT based backplane and said OLED device and through said thin conductive contact plate; and

    a dielectric layer deposited on top of said bottom electrode and covering said via and all the edges of said bottom electrode while leaving the rest of said bottom electrode uncovered.

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