Light guide plate made of lead-free glass having a high refractive index and image display device using a light guide plate
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United States of America Patent
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Nov 14, 2023
Grant Date -
Mar 16, 2023
app pub date -
Nov 16, 2022
filing date -
Jul 12, 2017
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Abstract
Provided is a light guide plate for an image display device which uses lead-free glass, has excellent color reproducibility and a light weight, and may obtain a wide viewing angle. A light guide plate for an image display device, which guides image light inputted from an image display element and outputs the image light toward a user's pupil, is configured to be made of lead-free glass having a refractive index of 1.8 or more with respect to a wavelength of the image light, and to have internal transmittance of 0.6 or more with respect to a wavelength of 400 nm when a plate thickness is 10 mm.
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