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Optics Letters

Optics Letters


  • Vol. 22, Iss. 19 — Oct. 1, 1997
  • pp: 1512–1514

Spin-cast planarization of liquid-crystal-on-silicon microdisplays

Miller H. Schuck, Douglas J. McKnight, and Kristina M. Johnson  »View Author Affiliations

Optics Letters, Vol. 22, Issue 19, pp. 1512-1514 (1997)

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A simplified method for planarizing liquid-crystal-on-silicon (LCOS) backplanes is presented. The method relies on the planarizing capability of spin-cast benzocyclobutene (BCB) polymeric resin. BCB planarization shows a sixfold reduction in step height on the surface of a typical LCOS backplane. Contact with the underlying pixel circuitry is made by dry etching through openings in the BCB layer. Reflective metal (87% reflectivity) is deposited over the planarized surface and patterned to form high-aperture-ratio pixel mirrors (84%). An average resistance of 0.75 Ω per via was achieved with 3.6-µm-diameter vias in 2-µm-thick BCB. The method and the results of this LCOS backplane planarization and postprocessing are described.

© 1997 Optical Society of America

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators
(230.3720) Optical devices : Liquid-crystal devices
(230.6120) Optical devices : Spatial light modulators
(310.0310) Thin films : Thin films

Miller H. Schuck, Douglas J. McKnight, and Kristina M. Johnson, "Spin-cast planarization of liquid-crystal-on-silicon microdisplays," Opt. Lett. 22, 1512-1514 (1997)

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