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System and method for the fluidic assembly of emissive displays

  • US 10,418,527 B2
  • Filed: 01/23/2017
  • Issued: 09/17/2019
  • Est. Priority Date: 10/31/2014
  • Status: Active Grant
First Claim
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1. A fluidic assembly method for the fabrication of emissive displays, the method comprising:

  • providing an emissive substrate with a top surface, a first plurality of wells formed in the top surface, each well comprising a bottom surface with a first electrical interface, and a matrix of column and row traces forming a first plurality of column/row intersections, where each column/row intersection is associated with a corresponding well;

    providing a liquid suspension of light emitting diodes (LEDs), with each LED having a post, made from an insulator material, extending from a surface;

    flowing the liquid suspension across the emissive substrate top surface;

    capturing the LEDs in the wells, oriented so that the posts are exposed and extending out of well openings in the emissive substrate top surface;

    annealing the emissive substrate; and

    , in response to the annealing, electrically connecting each LED to the first electrical interface of a corresponding well, wherein flowing the liquid suspension across the substrate top surface includes flipping the orientation of inverted LEDs, from a post-down to a post-up orientation, in response to drag forces resulting from a moment of force about an LED surface edge creating a fixed point of rotation with respect to a substrate surface.

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