Dynamic Backlight Gamma on High Dynamic Range LCD TVs

Author

Lin, Fang-Cheng ; Huang, Yi-Pai ; Liao, Lin-Yao ; Liao, Cheng-Yu ; Shieh, Han-Ping D. ; Wang, Te-Mei ; Yeh, Szu-Che

Author_Institution

Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu

Volume

4

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

139

Lastpage

146

Abstract

A high dynamic range liquid crystal display (HDR-LCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight. We studied the HDR-LCD as a dual-panel display: a backlight module and a liquid crystal (LC) cell. As the gamma of the LC signal, the backlight module was also endowed with a gamma function to control the contrast ratio of HDR images. The inverse of a mapping function (IMF) method proposed as a dynamic gamma mapping curve for the backlight module, has been demonstrated to further improve in HDR image quality. By implementing the IMF method on a HDR-LCD TV with 88 backlight zones, the image contrast ratio can reach while maintaining high brightness, clear image detail, and an average power reduction of 30%.

Keywords

flat panel displays; image enhancement; liquid crystal displays; television displays; IMF method; dual-panel display; dynamic backlight control; gamma function; high dynamic range LCD TV; image enhancement; image quality; inverse-mapping function; liquid crystal display; Backlight determination; contrast ratio; dual- panel; dynamic backlight; high dynamic range (HDR);

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2008.920175

Filename

4479499