# Optimal Local Dimming for LC Image Formation With Controllable Backlighting

Xiao Shu, Xiaolin Wu, Søren Forchhammer

Research output: Contribution to journalJournal articleResearchpeer-review

## Abstract

Light emitting diode (LED)-backlit liquid crystal displays (LCDs) hold the promise of improving image quality while reducing the energy consumption with signal-dependent local dimming. However, most existing local dimming algorithms are mostly motivated by simple implementation, and they often lack concern for visual quality. To fully realize the potential of LED-backlit LCDs and reduce the artifacts that often occur in current systems, we propose a novel local dimming technique that can achieve the theoretical highest fidelity of intensity reproduction in either $\ell_{1}$ or $\ell_{2}$ metrics. Both the exact and fast approximate versions of the optimal local dimming algorithm are proposed. Simulation results demonstrate superior performances of the proposed algorithm in terms of visual quality and power consumption.
Original language English I E E E Transactions on Image Processing 22 1 166-173 1057-7149 https://doi.org/10.1109/TIP.2012.2211371 Published - 2013

## Keywords

• Image contrast
• Image reproduction
• Light emitting diode (LED) backlighting
• Liquid crystal display (LCD)
• Optimization