Displays having mesa pixel configuration
AssigneeThe Trustees of Princeton University
InventorsStephen R. Forrest, Paul Burrows, Dmitri Z. Garbuzov
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Abstract
A multicolor organic light emitting display device employs angle-walled blue, green and red emitting mesas, with optional metal reflectors on the angled walls, in a plurality of pixels. The angle-walled mesas, which resemble truncated pyramids, direct light out of the mesa by reflection from the mesa side walls or by mirror reflection. The device of the present invention reduces waveguiding, thus simultaneously increasing both display brightness and resolution.
Claims33
A method of fabricating a multicolor display, said method comprising:
- depositing a dielectric layer over a transparent substrate;
- depositing a green phosphor layer over said dielectric layer;
- depositing an etch-stop, dielectric layer over said green phosphor layer;
- depositing a red phosphor layer over said etch-stop, dielectric layer;
- patterning via angle-dry etch to create a mesa-structure having first, second and third mesas, wherein each mesa has at least two angled side walls;
- etching to remove said red phosphor from said first mesa;
- etching to remove said green phosphor from said second mesa;
- depositing a transparent conductive coating over said two dimensional mesa structure to form contacts on said mesas;
- depositing an isolation dielectric over said mesa structure;
- etching windows in said isolation dielectric, wherein the placement of said windows corresponds to the position of the transparent conductive
- depositing a blue OLED structure over said isolation dielectric such that said blue OLED contacts said transparent conductive coating through said windows;
- depositing a reflective conductive coating over said blue OLED to form contacts on said blue OLED.
A method of fabricating a multicolor display, said method comprising:
- depositing a dielectric layer over a substrate;
- etching three flat-bottomed pits into said dielectric layer to form at least three reverse mesas, wherein each of the three reverse mesas has at least two angled side walls;
- depositing a metal layer over said three reverse mesas;
- depositing an isolation dielectric layer over said metal layer;
- etching windows in said isolation dielectric layer;
- depositing a blue OLED structure over said isolation dielectric such that said blue OLED contacts said metal layer through said windows;
- depositing a transparent conductive coating over said blue OLED to form contacts on said blue OLED, the position of said contacts corresponding to the position of said windows;
- depositing a second isolation dielectric layer over said contacts;
- depositing a red phosphor layer over said second isolation dielectric layer;
- etching to remove said red phosphor from a first two of said three reverse mesas;
- depositing a green phosphor layer over said second isolation dielectric layer;
- and
- etching to remove said green phosphor from a second two of said three reverse mesas.
A method of fabricating a multicolor display, said method comprising:
- etching at least three flat-bottomed pits into a substrate to form at least three reverse mesas, wherein each of the three reverse mesas has at least two angled side walls;
- depositing a metal layer over said three reverse mesas;
- etching windows in said isolation dielectric layer;
- depositing a blue OLED structure over said isolation dielectric such that said blue OLED contacts said metal layer through said windows;
- depositing a transparent conductive coating over said blue OLED to form contacts on said blue OLED, the position of said contacts corresponding to the position of said windows;
- depositing a second isolation dielectric layer over said contacts;
- depositing a red phosphor layer over said second isolation dielectric layer;
- etching to remove said red phosphor from a first two of said three reverse mesas;
- depositing a green phosphor layer over aid second isolation dielectric layer;
- and
- etching to remove said green phosphor from a second two of said three reverse mesas.
Dependencies are inferred from the claim text.