NDLI: Potential improvements for dual directional view displays

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gass, Paul Parry Jones, Lesley Yabuta, Koji Mather, Jonathan Imai, Akira Takatani, Tomoo
Abstract	Dual directional view (DDV) displays show different images to different viewers. For example, the driver of a car looking at a central DDV display could view navigation information, while the passenger, looking from a different angle, could be watching a movie. This technology, which has now established itself on the dashboards of high-end Jaguar, Mercedes, and Range Rover cars, is manufactured by Sharp Corporation using a well-known parallax barrier technique. Unfortunately parallax barriers are associated with an inevitable drop in brightness compared with a single view display. A parallax barrier-based DDV display typically has less than half the transmission of a single view display. Here we present a solution to these problems via the use of a combined microlens and parallax barrier system, which can not only boost the brightness by 55% from a parallax barrier-only system but increase the head freedom by 25% and reduce crosstalk also. However, the use of microlenses (which must be positioned between the polarizers of the LCD) can adversely affect the contrast ratio of the display. Careful choice of the LCD mode is therefore required in order to create a DDV display that is both high in brightness and contrast ratio. The use of a single-domain vertically aligned nematic (VAN) liquid crystal (LC) mode, together with a microlens plus parallax barrier system can achieve this with a contrast ratio of $ 1700 ∶ 1 $ measured at 30° to normal incidence.
ISSN	1559128X
Volume Number	53
Journal	Applied Optics
Issue Number	4
e-ISSN	21553165
Language	English
Publisher	Optical Society of America
Publisher Date	2014-02-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Optics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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