Optimized brightness compensation and contrast enhancement for transmissive liquid crystal displays

Chul Lee, Jin Hwan Kim, Chulwoo Lee, Chang-Su Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

An optimized brightness-compensated contrast enhancement (BCCE) algorithm for transmissive liquid crystal displays (LCDs) is proposed in this paper. We first develop a global contrast enhancement scheme to compensate for the reduced brightness when the backlight of an LCD device is dimmed for power reduction. We also derive a distortion model to describe the information loss due to the brightness compensation. Then, we formulate an objective function that consists of the contrast enhancement term and the distortion term. By minimizing the objective function, we maximize the backlight-scaled image contrast, subject to the constraint on the distortion. Simulation results show that the proposed BCCE algorithm provides high-quality images, even when the backlight intensity is reduced by up to 50-70% to save power.

Original languageEnglish
Article number6587738
Pages (from-to)576-590
Number of pages15
JournalIEEE Transactions on Circuits and Systems for Video Technology
Volume24
Issue number4
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Backlight scaling
  • Brightness compensation
  • Contrast enhancement
  • Histogram modification
  • Low-power image processing
  • Power management
  • Transmissive liquid crystal display (LCD)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Media Technology

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