Cooperative local dimming for accurate backlight brightness matching

Jung, Hwanseok; Lee, Y; Choi, Bong‐Keun; Suh, Dougyoung

doi:10.1049/el.2010.2992

Cited by 1 publication

(1 citation statement)

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“…A saliency map was also used to consider perceptual image quality [31]. However, these local dimming methods heuristically adjust the power based on neighboring blocks and the light spread from an LED light source [24]- [28] and thus do not estimate optimal power consumption. Some methods such as in [20] and [25] cannot be applied to an edge-lit LED backlight system.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Backlight Local Dimming Algorithm for Edge-Lit LED Backlight LCDs

Cha

Choi

Lee

et al. 2015

J. Display Technol.

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This paper presents an efficient optimized backlight local dimming method that minimizes power consumption under a given allowable distortion for liquid crystal displays with edge-lit light-emitting diode backlight. To reduce image quality fluctuation, an inequality constraint optimization problem is formulated using a given allowable distortion and the steepest descent method is used to solve the optimization problem. The experimental results show that the proposed method has better performance than previous methods at the same average power consumption in the unnoticeable level of the difference between the displayed images before and after dimming. Also, the proposed method reduces the risk of large performance degradation and reduces computation time by three times compared with the existing optimization based methods.Index Terms-Light-emitting diode (LED) backlight, light spread function (LSF), liquid crystal display (LCD), local dimming, optimization.

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