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In this study, we compared the effects of light from a high‐end LCD TV and an OLED TV on humans by measuring the saliva melatonin levels and the heart rate variability (HRV) during and before/after watching TV in the evening with 40 volunteers. Participants using the LCD TV demonstrated a decreased melatonin secretion by 2.7% after watching TV, whereas those utilizing the OLED TV exhibited an increase of 8.1%. The HRV analysis, which represents the relative activation levels of the sympathetic and parasympathetic nerves, revealed that on average, the OLED TV activated the parasympathetic nerves more than the LCD TV during the entire watching time. This indicates that watching OLED TVs induces relatively comfortable states. Further, a questionnaire was simultaneously conducted to assess eye discomfort and overall eye strain after watching TV, and the results showed a significantly increased eye fatigue after watching the high‐end LCD TV compared to the OLED TV.
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Yoo et al. (2025) studied this question.
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