Transparent substrate
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United States of America Patent
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Dec 6, 2022
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app pub date -
Nov 27, 2019
filing date -
Jun 15, 2017
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Abstract
A transparent substrate having an antiglare function includes first and second faces. The transparent substrate has a resolution index value T, a reflected image diffusivity index value R, and a sparkle index value S satisfying T≥0.25, R≥0.8, and 0.75≤S≤0.95, respectively. The resolution index value T is calculated as (luminance of zero-degrees transmission light)/(luminance of total transmission light). The reflected image diffusivity index value R is calculated as (R2+R3)/(2×R1), where R1 denotes a luminance of reflected light reflected at first angle α1, and R2, R3 denote luminance of reflected light at the second angle α2, the third angle α3, respectively, with respect to the first angle α1. The sparkle index value S is calculated as 1−(Sa/Ss), where the first sparkle Sa and the second sparkle Ss denote a sparkle value of the transparent substrate and a sparkle value of a glass substrate, respectively.
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