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  4. Sorted Sector Covering Combined with Image Condensation - An Efficient Method for Local Dimming of Direct-Lit and Edge-Lit LCDs
 
conference paper

Sorted Sector Covering Combined with Image Condensation - An Efficient Method for Local Dimming of Direct-Lit and Edge-Lit LCDs

Albrecht, Marc
•
Karrenbauer, Andreas
•
Jung, Tobias
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2010
Ieice Transactions On Electronics
16th International Display Workshop (IDW 09)

We consider the backlight calculation of local dimming as an optimization problem. The luminance produced by many LEDs at each pixel considered is calculated which should cover the gray value of each pixel. while the sum of LED currents is to be minimized. For this purpose a specific approach called as "Sorted Sector Covering" (SSC) was developed and is described in this paper. In our pre-processing unit called condenser the source image is reduced to a matrix of much lower resolution so that the computation effort of the SSC algorithm is drastically reduced. During this preprocessing phase. filter functions can be integrated so that a further reduction of the power consumption is achieved. Our processing system allows high power saving and high visual quality at low processor cost. We approach the local dimming problem in the physical viewing direction - from LED to pixel. The luminance for the pixel is based on the light spread function (LSF) and the PWM values of the LEDs. As the physical viewing direction is chosen, this method is universal and can be applied for any kind of LED arrangement - direct-lit as well as edge-lit. It is validated on prototypes, e.g., a locally dimmed edge-lit TV.

  • Details
  • Metrics
Type
conference paper
DOI
10.1587/transele.E93.C.1556
Web of Science ID

WOS:000284448400002

Author(s)
Albrecht, Marc
Karrenbauer, Andreas
Jung, Tobias
Xu, Chihao
Date Issued

2010

Published in
Ieice Transactions On Electronics
Volume

E93C

Start page

1556

End page

1563

Subjects

local dimming

•

backlight

•

algorithm

•

Led

•

edge-lit

•

side-lit

•

direct-lit

•

interaction between LEDs

•

crosstalk

•

optimization

•

high power saving

•

efficient processor

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
DISOPT  
Event nameEvent placeEvent date
16th International Display Workshop (IDW 09)

Miyazaki, JAPAN

Dec 09-11, 2009

Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/74947
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