Parabolic transition region curve for a wedge projection display

Kuan Wen Chen; Adrian Travis; Shun Yi Tan; Tim Wilkinson

doi:10.1117/12.807833

3 February 2009 Parabolic transition region curve for a wedge projection display

Kuan Wen Chen, Adrian Travis, Shun Yi Tan, Tim Wilkinson

Proceedings Volume 7232, Emerging Liquid Crystal Technologies IV; 72320U (2009) https://doi.org/10.1117/12.807833
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

A wedge shaped flat panel projection display can be made by combining a slab waveguide with a tapered "wedge" waveguide sector. The sudden angle transition between the flat slab-waveguide surface and the tilted wedge-waveguide surface, sometimes called the 'kink' in a conventional wedge flat panel screen design, causes the rays which are incident at the flat slab-waveguide surface just before the kink to overlap with the rays which are incident at the tilted wedge-waveguide surface just after the kink. This paper identifies the 'kink' problem by using the reverse ray tracing technique, where parallel rays are traced from the wedge-waveguide surface back to the receiving end of the slab-waveguide. We propose a parabolic curved transition region to be inserted between the slab and the wedge waveguide as the solution to this problem, as the parabolic curved surface replaces the 'kink' with a smoother angle change between the flat and the tilted waveguide surfaces, to avoid the rays overlapping. The parabolic curve is designed to introduce collimation for the rays projected from a point light source to avoid inducing convergence or divergence to the rays which are incident at the parabolic curved surface. A thick wedge design consisting of the slab, parabola and wedge waveguides is demonstrated in this paper which shows how the ray overlapping problem for a conventional slab-wedge waveguide design can be solved.

Citation Download Citation

Kuan Wen Chen, Adrian Travis, Shun Yi Tan, and Tim Wilkinson "Parabolic transition region curve for a wedge projection display", Proc. SPIE 7232, Emerging Liquid Crystal Technologies IV, 72320U (3 February 2009); https://doi.org/10.1117/12.807833

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available