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Comparison of the Blue Part of the Spectral Power Distribution in a Medical Liquid-Crystal Display for Different Color Temperature Settings

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H Akamine

H Akamine1*, T Kuramoto1 , T Kato1 , S Awamoto1 , Y Nakamura1 , N Hashimoto2 , J Morishita3 , (1) Kyushu University Hospital, Fukuoka, Japan, (2) EIZO corporation, Ishikawa, Japan (3) Kyushu University, Fukuoka, Japan


SU-E-I-16 Sunday 3:00PM - 6:00PM Room: Exhibit Hall

Purpose: The effects of blue light exposure on visual fatigue have received much attention in recent years. There have been attempts to reduce the blue part of the spectral power distribution in a display's output by using commercial films and glasses. However, reducing the blue part of the spectral power distribution in medical liquid-crystal displays (LCDs) by changing the color temperature settings may prove to be a simpler solution. Our study aimed to quantitatively compare the blue part of the spectral power distribution of a medical LCD in different color temperature settings.
Materials and Methods: We used two color LCDs (RadiForce RX340, 400 cd/m², EIZO). The spectral power distribution, chromaticity, and correlated color temperature were measured for LCDs with different color temperature settings (6500, 7500, and 8500 K). The default color temperature setting of the medical LCDs used in this study was 7500 K. A spectroradiometer (CS-2000, KONICA MINOLTA) and original gray-scale test patterns with 18 different luminance levels were used for the measurements.
Results: The blue parts of the spectral power distribution (380-495 nm) were different for each color temperature setting. The integrated power values over the blue of the spectral power distribution decreased by 9% from 8500 to 7500 K and 13% and from 7500 to 6500 K. The correlated color temperature changed by approximately 1000 K depending on the color temperature setting. The difference in the chromaticity was 0.011 between 8500 and 7500 K and between 7500 and 6500 K.
Conclusion: Our results quantitatively indicate that the blue part of the spectral power distribution of the medical LCDs tested varies for different settings of color temperature.

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