Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect

Tomokazu SHIGA; Soshi KITAHARA

doi:10.1587/transele.E100.C.1026

Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect

Tomokazu SHIGA, Soshi KITAHARA

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The Helmholtz-Kohlraush effect is a visual characteristic that humans perceive color having higher saturation as brighter. In the proposed method, the pixel value is reduced by increasing the saturation while maintaining the hue and value of HSV color space, resulting in power saving of OLED displays since the power consumption of OLED displays directly depends on the pixel value. Although the luminance decreases, brightness of image is maintained by the Helmholtz-Kohlraush effect. In order to suppress excessive increase of saturation, the increase factor of saturation is reduced with an increase in brightness. As maximum increase factor of saturation, k_MAX, increases, more power is reduced but unpleasant color change takes place. From the subjective evaluation experiment with the 23 test images consisting of skin, natural and non-natural images, it is found that k_MAX is less than 2.0 to suppress the unpleasant color change. When k_MAX is 2.0, the power saving is 8.0%. The effectiveness of the proposed technique is confirmed by using a smart phone having 4.5 inches diagonal RGB AMOLED display.

Publication: IEICE TRANSACTIONS on Electronics Vol.E100-C No.11 pp.1026-1030

Publication Date: 2017/11/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E100.C.1026

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

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Authors

Tomokazu SHIGA
the University of Electro-Communications
Soshi KITAHARA
the University of Electro-Communications

Keyword

mobile display, power reduction, visual characteristic

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Tomokazu SHIGA, Soshi KITAHARA, "Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect" in IEICE TRANSACTIONS on Electronics, vol. E100-C, no. 11, pp. 1026-1030, November 2017, doi: 10.1587/transele.E100.C.1026.
Abstract: The Helmholtz-Kohlraush effect is a visual characteristic that humans perceive color having higher saturation as brighter. In the proposed method, the pixel value is reduced by increasing the saturation while maintaining the hue and value of HSV color space, resulting in power saving of OLED displays since the power consumption of OLED displays directly depends on the pixel value. Although the luminance decreases, brightness of image is maintained by the Helmholtz-Kohlraush effect. In order to suppress excessive increase of saturation, the increase factor of saturation is reduced with an increase in brightness. As maximum increase factor of saturation, k_MAX, increases, more power is reduced but unpleasant color change takes place. From the subjective evaluation experiment with the 23 test images consisting of skin, natural and non-natural images, it is found that k_MAX is less than 2.0 to suppress the unpleasant color change. When k_MAX is 2.0, the power saving is 8.0%. The effectiveness of the proposed technique is confirmed by using a smart phone having 4.5 inches diagonal RGB AMOLED display.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E100.C.1026/_p

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@ARTICLE{e100-c_11_1026,
author={Tomokazu SHIGA, Soshi KITAHARA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect},
year={2017},
volume={E100-C},
number={11},
pages={1026-1030},
abstract={The Helmholtz-Kohlraush effect is a visual characteristic that humans perceive color having higher saturation as brighter. In the proposed method, the pixel value is reduced by increasing the saturation while maintaining the hue and value of HSV color space, resulting in power saving of OLED displays since the power consumption of OLED displays directly depends on the pixel value. Although the luminance decreases, brightness of image is maintained by the Helmholtz-Kohlraush effect. In order to suppress excessive increase of saturation, the increase factor of saturation is reduced with an increase in brightness. As maximum increase factor of saturation, k_MAX, increases, more power is reduced but unpleasant color change takes place. From the subjective evaluation experiment with the 23 test images consisting of skin, natural and non-natural images, it is found that k_MAX is less than 2.0 to suppress the unpleasant color change. When k_MAX is 2.0, the power saving is 8.0%. The effectiveness of the proposed technique is confirmed by using a smart phone having 4.5 inches diagonal RGB AMOLED display.},
keywords={},
doi={10.1587/transele.E100.C.1026},
ISSN={1745-1353},
month={November},}

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TY - JOUR
TI - Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect
T2 - IEICE TRANSACTIONS on Electronics
SP - 1026
EP - 1030
AU - Tomokazu SHIGA
AU - Soshi KITAHARA
PY - 2017
DO - 10.1587/transele.E100.C.1026
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E100-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2017
AB - The Helmholtz-Kohlraush effect is a visual characteristic that humans perceive color having higher saturation as brighter. In the proposed method, the pixel value is reduced by increasing the saturation while maintaining the hue and value of HSV color space, resulting in power saving of OLED displays since the power consumption of OLED displays directly depends on the pixel value. Although the luminance decreases, brightness of image is maintained by the Helmholtz-Kohlraush effect. In order to suppress excessive increase of saturation, the increase factor of saturation is reduced with an increase in brightness. As maximum increase factor of saturation, k_MAX, increases, more power is reduced but unpleasant color change takes place. From the subjective evaluation experiment with the 23 test images consisting of skin, natural and non-natural images, it is found that k_MAX is less than 2.0 to suppress the unpleasant color change. When k_MAX is 2.0, the power saving is 8.0%. The effectiveness of the proposed technique is confirmed by using a smart phone having 4.5 inches diagonal RGB AMOLED display.
ER -