Difference analysis of visual brain response between natural light and traditional LED based on steady-state visual evoked potential (SSVEP) paradigm stimulation

Abstract

Display light source has an important influence on the eye health. In most of the work and life scenes, LED panel light source display is still the backbone of the market. The discrete spectrum and high intensity blue spectrum of LED light source have been criticized. Therefore, this paper innovates the display screen with natural light source instead of LED light source (remove the backlight and keep a uniform light sheet), and compares the paradigm stimulation under natural light and LED light based on steady-state visual evoked potential (SSVEP). Finally, the difference analysis of human visual brain response is given. In this study, the subjects were asked to evaluate the different performances of natural light source and LED light source in the range of illumination (284.12lx-13508.76lx) and color temperature (4973k-8511k), subjective (NASA-TLX) and objective (α + θ band index, pupil diameter, amplitude and signal-to-noise ratio of SSVEPs). NASA-TLX shows that natural light source with the same brightness can significantly reduce the visual fatigue of the subjects. The α + θ band index and the amplitude and signal-to-noise ratio of SSVEPs indicate that led light source can decrease human visual perception sensitivity and deepen visual fatigue more than natural light source in long-term light source stimulation experiment. The data of pupil diameter show that compared with natural light source, LED light source can stimulate human pupil to adjust in a large range. Under the same objective factors, such as test time and stimulus paradigm, human eyes are more likely to feel tired. On the basis of this research, this paper proposes a new light source design idea, which combines natural light source and adaptive LED light source under the relevant illumination and color temperature. It provides a valuable reference for indoor work and life environment design and improving light environment satisfaction.