Low Power Consumption Technology for Ultra-High Resolution Mobile Display by Using RGBW System

Akira SAKAIGAWA; Masaaki KABE; Tsutomu HARADA; Fumitaka GOTO; Naoyuki TAKASAKI; Masashi MITSUI; Tae NAKAHARA; Kojiro IKEDA; Kenta SEKI; Toshiyuki NAGATSUMA; Amane HIGASHI

doi:10.1587/transele.E96.C.1367

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Low Power Consumption Technology for Ultra-High Resolution Mobile Display by Using RGBW System

Akira SAKAIGAWA, Masaaki KABE, Tsutomu HARADA, Fumitaka GOTO, Naoyuki TAKASAKI, Masashi MITSUI, Tae NAKAHARA, Kojiro IKEDA, Kenta SEKI, Toshiyuki NAGATSUMA, Amane HIGASHI

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Summary :

Battery life and outdoor visibility are two of the most important features for mobile applications today. It is desirable to achieve both low power consumption and excellent outdoor visibility on the display device at the same time. We have previously reported a new RGBW method to realize low power consumption and high luminance with high image quality. In this paper, the basic concept of a new RGBW calculation utilizing an “Extended HSV color space” model is described, and also its performance, such as low power consumption, color image reproducibility and outdoor visibility is presented. The new method focuses on the luminance-increase ratio by means of a White signal for the display image data, and derives the appropriate RGBW signal and backlight PWM signal for every frame period. This dynamically controlled system solves the problems of conventional RGBW systems, and realizes the same image quality as a corresponding RGB display. In order to quantify its color image reproducibility, a spectroscopic measurement has been completed using the Macbeth Color Chart. In addition, the advantages of high luminance by the new RGBW method is described. The converted tone curve with an RGBW method provides very high luminance, such as 1,000cd/m², and improved outdoor visibility. Finally, a newly developed 4.38-inch full-HD (1,080 × 1,920) 503ppi prototype LCD utilizing this new RGBW technology is described.

Publication: IEICE TRANSACTIONS on Electronics Vol.E96-C No.11 pp.1367-1372

Publication Date: 2013/11/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E96.C.1367

Type of Manuscript: Special Section INVITED PAPER (Special Section on Electronic Displays)

Category

Authors

Akira SAKAIGAWA
  Japan Display Inc.
Masaaki KABE
  Japan Display Inc.
Tsutomu HARADA
  Japan Display Inc.
Fumitaka GOTO
  Japan Display Inc.
Naoyuki TAKASAKI
  Japan Display Inc.
Masashi MITSUI
  Japan Display Inc.
Tae NAKAHARA
  Japan Display Inc.
Kojiro IKEDA
  Japan Display Inc.
Kenta SEKI
  Japan Display Inc.
Toshiyuki NAGATSUMA
  Japan Display Inc.
Amane HIGASHI
  Japan Display Inc.

Keyword

low power consumption, ultra-high resolution, LCD, mobile display, RGBW

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Akira SAKAIGAWA, Masaaki KABE, Tsutomu HARADA, Fumitaka GOTO, Naoyuki TAKASAKI, Masashi MITSUI, Tae NAKAHARA, Kojiro IKEDA, Kenta SEKI, Toshiyuki NAGATSUMA, Amane HIGASHI, "Low Power Consumption Technology for Ultra-High Resolution Mobile Display by Using RGBW System" in IEICE TRANSACTIONS on Electronics, vol. E96-C, no. 11, pp. 1367-1372, November 2013, doi: 10.1587/transele.E96.C.1367.
Abstract: Battery life and outdoor visibility are two of the most important features for mobile applications today. It is desirable to achieve both low power consumption and excellent outdoor visibility on the display device at the same time. We have previously reported a new RGBW method to realize low power consumption and high luminance with high image quality. In this paper, the basic concept of a new RGBW calculation utilizing an “Extended HSV color space” model is described, and also its performance, such as low power consumption, color image reproducibility and outdoor visibility is presented. The new method focuses on the luminance-increase ratio by means of a White signal for the display image data, and derives the appropriate RGBW signal and backlight PWM signal for every frame period. This dynamically controlled system solves the problems of conventional RGBW systems, and realizes the same image quality as a corresponding RGB display. In order to quantify its color image reproducibility, a spectroscopic measurement has been completed using the Macbeth Color Chart. In addition, the advantages of high luminance by the new RGBW method is described. The converted tone curve with an RGBW method provides very high luminance, such as 1,000cd/m², and improved outdoor visibility. Finally, a newly developed 4.38-inch full-HD (1,080 × 1,920) 503ppi prototype LCD utilizing this new RGBW technology is described.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E96.C.1367/_p

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@ARTICLE{e96-c_11_1367,
author={Akira SAKAIGAWA, Masaaki KABE, Tsutomu HARADA, Fumitaka GOTO, Naoyuki TAKASAKI, Masashi MITSUI, Tae NAKAHARA, Kojiro IKEDA, Kenta SEKI, Toshiyuki NAGATSUMA, Amane HIGASHI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Low Power Consumption Technology for Ultra-High Resolution Mobile Display by Using RGBW System},
year={2013},
volume={E96-C},
number={11},
pages={1367-1372},
abstract={Battery life and outdoor visibility are two of the most important features for mobile applications today. It is desirable to achieve both low power consumption and excellent outdoor visibility on the display device at the same time. We have previously reported a new RGBW method to realize low power consumption and high luminance with high image quality. In this paper, the basic concept of a new RGBW calculation utilizing an “Extended HSV color space” model is described, and also its performance, such as low power consumption, color image reproducibility and outdoor visibility is presented. The new method focuses on the luminance-increase ratio by means of a White signal for the display image data, and derives the appropriate RGBW signal and backlight PWM signal for every frame period. This dynamically controlled system solves the problems of conventional RGBW systems, and realizes the same image quality as a corresponding RGB display. In order to quantify its color image reproducibility, a spectroscopic measurement has been completed using the Macbeth Color Chart. In addition, the advantages of high luminance by the new RGBW method is described. The converted tone curve with an RGBW method provides very high luminance, such as 1,000cd/m², and improved outdoor visibility. Finally, a newly developed 4.38-inch full-HD (1,080 × 1,920) 503ppi prototype LCD utilizing this new RGBW technology is described.},
keywords={},
doi={10.1587/transele.E96.C.1367},
ISSN={1745-1353},
month={November},}

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TY - JOUR
TI - Low Power Consumption Technology for Ultra-High Resolution Mobile Display by Using RGBW System
T2 - IEICE TRANSACTIONS on Electronics
SP - 1367
EP - 1372
AU - Akira SAKAIGAWA
AU - Masaaki KABE
AU - Tsutomu HARADA
AU - Fumitaka GOTO
AU - Naoyuki TAKASAKI
AU - Masashi MITSUI
AU - Tae NAKAHARA
AU - Kojiro IKEDA
AU - Kenta SEKI
AU - Toshiyuki NAGATSUMA
AU - Amane HIGASHI
PY - 2013
DO - 10.1587/transele.E96.C.1367
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E96-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2013
AB - Battery life and outdoor visibility are two of the most important features for mobile applications today. It is desirable to achieve both low power consumption and excellent outdoor visibility on the display device at the same time. We have previously reported a new RGBW method to realize low power consumption and high luminance with high image quality. In this paper, the basic concept of a new RGBW calculation utilizing an “Extended HSV color space” model is described, and also its performance, such as low power consumption, color image reproducibility and outdoor visibility is presented. The new method focuses on the luminance-increase ratio by means of a White signal for the display image data, and derives the appropriate RGBW signal and backlight PWM signal for every frame period. This dynamically controlled system solves the problems of conventional RGBW systems, and realizes the same image quality as a corresponding RGB display. In order to quantify its color image reproducibility, a spectroscopic measurement has been completed using the Macbeth Color Chart. In addition, the advantages of high luminance by the new RGBW method is described. The converted tone curve with an RGBW method provides very high luminance, such as 1,000cd/m², and improved outdoor visibility. Finally, a newly developed 4.38-inch full-HD (1,080 × 1,920) 503ppi prototype LCD utilizing this new RGBW technology is described.
ER -