Visual Fatigue Caused by Tablet PC Based on Critical Fusion Frequency and Eye Blink Frequency

Abstract

The objective of the study is to evaluate visual fatigue induced by different tablet PCs (LCD/OLED) by measuring CFF (critical fusion frequency), BF (eye blink frequency) and (SR) subjective rating. Twelve healthy subjects (10 males and 2 females) participated in the study in a controlled simulated living environment with a 18-23°C temperature, 30-45% relative humidity and 150lx illuminance. The experiment was carried out about 50 minutes, including: 30 minutes watching task (EOG test) and 20 minutes test (including subjective questionnaire and CFF test before and after the experiment). The experiment design included dependent variables: CFF, BF and subjective rating (SR); and two independent variables: Tablet PC types, watching times. As a result, after the experiment, the decline range of CFF of LCD was lower significant than that of OLED (p<0.001); the decline range of BF of LCD was higher than that of OLED (p<0.01). Also, subjective rating indicated a consistent result that higher visual fatigue was founded after watching LCD. As a whole, watching LCD tablet PC caused higher visual fatigue than watching OLED tablet PC in general.