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 Color tuned holographic optical elements and methods of making and using the elements

Details
Inventors: Weber, Andrew M.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Dzierzynski; Paul M.
Assistant Examiner: Chang; Audrey
Attorney, Agent or Firm: Magee; Thomas H.

The present invention relates to color tuned holographic multicolor optical elements for use as multicolor transmission filters in liquid crystal displays and methods of making the elements. The element comprises at least first and second pixel volumes containing holographic mirrors and preferably third pixel volumes containing holographic mirrors. Each set of pixel volumes passes a different color wavelength band and reflects other color wavelength bands.

DETAILED DESCRIPTION The invention relates to a color tuned volume holographic optical element, comprising: a photohardened holographic recording film element comprising at least a first plurality of pixel volumes and a second plurality of pixel volumes arranged in rows and columns; each one of the first pixel volumes including a color tuned volume holographic mirror that passes light with at least a first color (e.
g.
, Red) wavelength band and reflects light with at least another color (e.
g.
, Green) wavelength band; and each one of the second pixel volumes including a volume holographic mirror that passes light with at least the another color (e.
g.
, Green) wavelength band and reflects light with at least the first color (e.
g.
, Red) wavelength band.
The invention further relates to a color tuned volume holographic optical element, comprising: a photohardened holographic recording film element comprising a first plurality of pixel volumes, a second plurality of pixel volumes, and a third plurality of pixel volumes; each one of the first pixel volumes including a color tuned volume holographic mirror that passes light with a first color (e.
g.
, Red) wavelength band and reflects light with a second color (e.
g.
, Green) wavelength band, a third color (e.
g.
, Blue) wavelength band and a fourth color (e.
g.
, NIR) wavelength band; each one of the second pixel volumes including a non-color tuned volume holographic mirror that passes light with the second color (e.
g.
, Green) wavelength band and reflects light with the first color (e.
g.
, Red) wavelength band, the third color (e.
g.
, Blue) wavelength band and a fifth color (e.
g.
, UV) wavelength band; and each one of the third pixel volumes including a color tuned volume holographic mirror that passes light with the third color (e.
g.
, Blue) wavelength band and reflects light with the first color (e.
g.
, Red) wavelength band, the second color (e.
g.
, Green) wavelength band and a sixth color (e.
g.
, mid IR) wavelength band.
The invention is further directed to a first method for making a first color tuned volume holographic optical element, comprising: a holographic recording film element comprising a first plurality of pixel volumes, a second plurality of pixel volumes, and a third plurality of pixel volumes; each one of the first pixel volumes including a color tuned volume holographic mirror that passes light with a first color (e



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