Image quality evaluation of LCDs based on novel RGBW sub-pixel structure

Sungjin Kim; Dongwoo Kang; Jinsang Lee; Jaekyeom Kim; Yongmin Park; Taeseong Han; Sooyeon Jung; Jang Jin Yoo; Moojong Lim; Jongsang Baek

doi:10.1117/12.2077071

8 February 2015 Image quality evaluation of LCDs based on novel RGBW sub-pixel structure

Sungjin Kim, Dongwoo Kang, Jinsang Lee, Jaekyeom Kim, Yongmin Park, Taeseong Han, Sooyeon Jung, Jang Jin Yoo, Moojong Lim, Jongsang Baek

Author Affiliations +

Proceedings Volume 9396, Image Quality and System Performance XII; 939613 (2015) https://doi.org/10.1117/12.2077071
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

Many display manufacturers have studied RGBW pixel structure adding a white sub-pixel to RGB LCD and recently revealed UHD TVs based on novel RGBW LCD. The RGBW LCD has 50% higher white luminance and 25% lower primary color luminance compared to RGB LCD. In this paper, the image quality of RGBW and RGB LCD was dealt with. Before evaluating them, TV broadcast video and IEC-62087 video were analyzed for test video clips. In order to analyze them, a TV reference video from TV broadcast content in Korea was firstly collected. As a result of TV reference video analysis, RGBW LCD was expected to improve image quality more because most of colors are distributed around white point and population ratio of achromatic colors is higher. RGB, RGBW and RGBW using wide color gamut (WCG) backlight unit (BLU) LCDs were prepared, and a series of visual assessments were conducted. As a result, RGBW LCD obtained higher scores than RGB LCD about four attributes (‘Brightness’, ‘Naturalness’, ‘Contrast’ and overall image quality) and ‘Colorfulness’ was not higher score than RGB LCD in test still images. RGBW LCD’s overall image quality in the TV reference video clips also was assessed higher than RGB LCD. Additionally, RGBW LCD using WCG BLU shows better performance about especially ‘Colorfulness’ than RGBW LCD.

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Sungjin Kim, Dongwoo Kang, Jinsang Lee, Jaekyeom Kim, Yongmin Park, Taeseong Han, Sooyeon Jung, Jang Jin Yoo, Moojong Lim, and Jongsang Baek "Image quality evaluation of LCDs based on novel RGBW sub-pixel structure", Proc. SPIE 9396, Image Quality and System Performance XII, 939613 (8 February 2015); https://doi.org/10.1117/12.2077071

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KEYWORDS

LCDs

Video

RGB color model

Image quality

High dynamic range imaging

Digital video recorders

Televisions

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