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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 34 — Dec. 1, 2013
  • pp: 8239–8244

Modified point spread function for efficient high dynamic range LED backlight capable of high uniformity, high contrast, and smooth gradients

Jakob Emmel and Lorne A. Whitehead  »View Author Affiliations


Applied Optics, Vol. 52, Issue 34, pp. 8239-8244 (2013)
http://dx.doi.org/10.1364/AO.52.008239


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Abstract

We investigate the effect of new point spread functions (PSFs) on the uniformity and contrast of high dynamic range displays that use local dimming of LEDs to yield a large dynamic range. A PSF shaped like a quadratic B-spline was hypothesized to create a uniform brightness backlight, as well as producing linear and quadratic gradients, while maintaining a very high contrast. We have found a practical optical structure to produce such a PSF, yielding a nonuniformity of only ±0.8%, while enabling a contrast ratio of 51 and 331 over distances of one and two unit cell spacings, respectively.

© 2013 Optical Society of America

OCIS Codes
(080.2720) Geometric optics : Mathematical methods (general)
(120.2040) Instrumentation, measurement, and metrology : Displays
(150.2950) Machine vision : Illumination
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Optical Devices

History
Original Manuscript: September 11, 2013
Revised Manuscript: October 18, 2013
Manuscript Accepted: October 25, 2013
Published: November 25, 2013

Citation
Jakob Emmel and Lorne A. Whitehead, "Modified point spread function for efficient high dynamic range LED backlight capable of high uniformity, high contrast, and smooth gradients," Appl. Opt. 52, 8239-8244 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-34-8239

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