Abstract
Recently more and more attentions have been drawn on the anti-glare property of display glass, which is directly related to visual health. However, it is still a big challenge to study the influence of the micron-size metasurface structure on the anti-glare property of glass by way of experiment. In this work, an ideal micron-size metasurface filled with uniform pits was firstly established on the display glass via the theoretical simulation. By using FDTD solutions software, the influences of the diameter (D) and depth (L) of the pits on anti-glare properties, such as reflectance and transmittance, electric field intensity distribution, energy flow density distribution, maximum reflection angle and maximum refraction angle, were investigated detailedly. Results show that a small size (less than 6 μm) of pits can promote the anti-reflectance, transmittance and anti-glare property of display glass. Meanwhile, when the diameter of pits matched well with the depth, namely D = 1/L = 0.3–0.4 μm, or D = 3/L = 0.6–1.1 μm, the color brightness and contrast of display glass were improved largely. The equivalent reflectance and equivalent transmittance can also be calculated at the wavelength of 200–1200 nm by using contour cloud map to find the optimal diameter and depth with good anti-glare performance. The distribution of electric field intensity and energy flow density at the specific wavelength which is equal or close to the size of the pits also help to illustrate the flash point position, and the short-range anti-reflection effect and long-range diffuse reflectance effect of metasurface pit structure. Specially, when the diameter is 3 μm and the depth is 0.6 μm, the maximum reflection angle is 113.8°, the maximum refraction angle is 138.6°, the equivalent reflectance is 3.58%, and the glass shows excellent anti-reflection and anti-glare properties, which make the display glass more comfortable and colorful.
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