75‐3: Highly Collimated Backlight for Liquid Crystal Displays

In this work, we present the design of a collimated backlight design that can be used for a liquid crystal display. The design is based on a hexagonal array of white light emitting diodes (LEDs) in combination with two arrays of lenses. Ray tracing simulations show a full width ‐ half maximum (FWHM)...

Full description

Saved in:
Bibliographic Details
Published in:SID International Symposium Digest of technical papers 2020-08, Vol.51 (1), p.1120-1123
Main Authors: Berteloot, Brecht, Beeckman, Jeroen, Stuyven, Gert, Vermeirsch, Koenraad, Blomme, Tom, Neyts, Kristiaan
Format: Article
Language:English
Subjects:
Arrays
Collimated backlight
Collimation
Color shift
Contrast ratio
Directional backlight
Light emitting diodes
Liquid Crystal Display
Liquid crystal displays
Nematic crystals
Ray tracing
Twisted Nematic LCD
White light
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work, we present the design of a collimated backlight design that can be used for a liquid crystal display. The design is based on a hexagonal array of white light emitting diodes (LEDs) in combination with two arrays of lenses. Ray tracing simulations show a full width ‐ half maximum (FWHM) collimation angle of 2.8º with a uniformity of 73%. A prototype of this design has been fabricated and its performance has been analyzed. Compared to a standard backlight, the collimated backlight provides a 4.2 times better contrast ratio for a twisted nematic (TN) liquid crystal (LC) panel. In combination with a diffusor in front of the LC panel, the contrast ratio under a wide viewing angle is improved by a factor of 10 and the color shift is reduced by 79%.
ISSN:0097-966X
2168-0159
DOI:10.1002/sdtp.14072