Pixel having an organic light emitting diode and method of fabricating the pixel
First Claim
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1. A pixel having a vertical architecture in which a thin film transistor (TFT)-based backplane and an organic light emitting device (OLED) are formed on the same substrate, said pixel comprising:
- a substrate having a substantially flat upper surface;
a TFT-based backplane formed on said substantially flat upper surface of said substrate for electrically driving the OLED, said TFT-based backplane having a vertical profile facing away from said upper surface of said substrate;
a planarization dielectric layer formed on top of said TFT based backplane and having a smooth, planarized upper surface for planarizing said vertical profile on the TFT based backplane;
the OLED formed on top of said planarized surface of said planarization dielectric layer, said OLED device having a bottom electrode, a top electrode, and the organic light emitting layer between the bottom and top electrodes, said bottom electrode being formed on said planarized surface, said top electrode being transparent so that light to be emitted by said OLED travels in a direction opposite to said substrate to form a top-emitting OLED;
the OLED being vertically integrated with the TFT based backplane via the planarization dielectric layer, the portion of the organic light emitting layer between the bottom and top electrodes of the OLED at least partially overlapping a gate, source, or drain node of a transistor of the TFT based backplane;
a first via in the planarization dielectric layer, for providing a communication path between the TFT based backplane and the OLED, wherein a sidewall of the first via is sloped against the TFT based backplane; and
an additional dielectric layer deposited on top of said bottom electrode for covering at least one of said first via and edges of said bottom electrode while leaving the rest of said bottom electrode uncovered, said organic light emitting layer being applied over said dielectric cap.
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Abstract
A pixel having an organic light emitting diode (OLED) and method for fabricating the pixel is provided. A planarization dielectric layer is provided between a thin-film transistor (TFT) based backplane and OLED layers. A through via between the TFT backplane and the OLED layers forms a sidewall angle of less than 90 degrees to the TFT backplane. The via area and edges of an OLED bottom electrode pattern may be covered with a dielectric cap.
103 Citations
29 Claims
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1. A pixel having a vertical architecture in which a thin film transistor (TFT)-based backplane and an organic light emitting device (OLED) are formed on the same substrate, said pixel comprising:
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a substrate having a substantially flat upper surface; a TFT-based backplane formed on said substantially flat upper surface of said substrate for electrically driving the OLED, said TFT-based backplane having a vertical profile facing away from said upper surface of said substrate; a planarization dielectric layer formed on top of said TFT based backplane and having a smooth, planarized upper surface for planarizing said vertical profile on the TFT based backplane; the OLED formed on top of said planarized surface of said planarization dielectric layer, said OLED device having a bottom electrode, a top electrode, and the organic light emitting layer between the bottom and top electrodes, said bottom electrode being formed on said planarized surface, said top electrode being transparent so that light to be emitted by said OLED travels in a direction opposite to said substrate to form a top-emitting OLED; the OLED being vertically integrated with the TFT based backplane via the planarization dielectric layer, the portion of the organic light emitting layer between the bottom and top electrodes of the OLED at least partially overlapping a gate, source, or drain node of a transistor of the TFT based backplane; a first via in the planarization dielectric layer, for providing a communication path between the TFT based backplane and the OLED, wherein a sidewall of the first via is sloped against the TFT based backplane; and an additional dielectric layer deposited on top of said bottom electrode for covering at least one of said first via and edges of said bottom electrode while leaving the rest of said bottom electrode uncovered, said organic light emitting layer being applied over said dielectric cap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of fabricating a display that includes multiple pixels each of which has a vertical architecture in which a thin film transistor (TFT)-based backplane and an organic light emitting device (OLED) are formed on the same substrate, the method comprising:
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forming a TFT based backplane including a gate, source, and drain nodes on a substrate having a substantially flat upper surface, the TFT-based backplane having a vertical profile facing away from the upper surface of the substrate; forming a planarization dielectric layer on top of said TFT based backplane, the planarization layer having a smooth, planarized upper surface for planarizing the vertical profile on the TFT based backplane; forming a first via in the planarization dielectric layer, such that a sidewall of the first via is sloped against the TFT based backplane; forming the OLED on top of the planarized surface of the planarization layer, the OLED having a top electrode and a bottom electrode and an organic light emitting layer between the top and bottom electrodes, the bottom electrode being formed on the planarized surface, the OLED being vertically integrated with the TFT-based backplane via the planarization layer, the portion of the organic light emitting layer between the top and bottom electrodes at least partially overlapping a gate, source, or drain node of the TFT based backplane, and the first via provides a communication path between the TFT backplane and the OLED, the top electrode being transparent so that light to be emitted by the OLED travels in a direction opposite to the substrate to form a top-emitting OLED; and forming an additional dielectric layer for covering at least one of the first via and edges of the bottom electrode while leaving the rest of the bottom electrode uncovered. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 27, 28, 29)
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26. A method as claimed in 18, wherein the forming a TFT based backplane comprises:
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patterning an interlayer dielectric on the TFT; and patterning an interconnection plate on a second via of the interlayer dielectric layer, the interconnection plate being connected to the source or drain node, the first via being formed on the interconnection plate to provide the communication path through the interconnection plate.
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Specification