75‐3: Highly Collimated Backlight for Liquid Crystal Displays | Zendy

Berteloot Brecht | Zendy; Beeckman Jeroen | Zendy; Stuyven Gert | Zendy; Vermeirsch Koenraad | Zendy; Blomme Tom | Zendy; Neyts Kristiaan | Zendy

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75‐3: Highly Collimated Backlight for Liquid Crystal Displays

Author(s) -

Berteloot Brecht,

Beeckman Jeroen,

Stuyven Gert,

Vermeirsch Koenraad,

Blomme Tom,

Neyts Kristiaan

Publication year - 2020

Publication title -

sid symposium digest of technical papers

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.351

H-Index - 44

eISSN - 2168-0159

pISSN - 0097-966X

DOI - 10.1002/sdtp.14072

Subject(s) - backlight , collimated light , liquid crystal display , full width at half maximum , optics , contrast ratio , materials science , contrast (vision) , hexagonal crystal system , diode , optoelectronics , light emitting diode , liquid crystal , ray tracing (physics) , flat panel , beam expander , physics , chemistry , laser , crystallography , laser beams

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%.

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