Holographic Waveguide Array Rollable Display.
Abstract
POC investigated the feasibility of developing a holographic waveguide array rollable display based on holographic optics and a multilayer polymer waveguide substrate. The Phase 1 investigation began with a preliminary study, modeling the multiplanar waveguide and analyzing its light propagation characteristics. Based on the waveguide requirements, possible display system architectures were investigated. In parallel, several types of photopolymers were characterized to evaluate their suitability for holographic and multiplanar waveguide fabrication. Finally, a proof of principle of a multiplanar waveguide fabrication and planar display was demonstrated in the laboratory. The main conclusions to be drawn from this investigation are: (1) Computer modeling, analytical calculation and experimental analyses have shown that it is possible to use very thin (1 to 2 microns) polymer waveguide layers with realistic refractive indexes corresponding to commercially available polymer films to allow efficient, low loss propagation of three primary colors (RGB) of laser light simultaneously with sufficient tolerance in the coupling angles. Total thickness of the polymer substrate can be 2 to 4 mm for a vertical resolution of 1024; (2) Dichromated gelatin and DuPont photopolymers showed maximum index modulation of 0.02 to 0.06 achievable for holographic optics and waveguide recording. DCG shows higher diffraction efficiency (98%) and lower (<2%) loss than DuPont photopolymer, while in terms of processing and stability DuPont polymer is more suitable for input/output coupling hologram fabrication; (3) Three image forming approaches -- 2-D laser beam scanning; 1-D line image and 2-D direct image projection without scanning -- are suitable for image input into the scanning; multiplanar polymer waveguide substrate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1997
- Accession Number
- ADA325770
Entities
People
- Tin M. Aye