OPTICAL FILM SET, BACKLIGHT MODULE AND DISPLAY DEVICE
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United States of America Patent
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Issued Date -
Oct 3, 2024
app pub date -
Jun 6, 2024
filing date -
Dec 9, 2021
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Abstract
An optical film set is configured to guide light from a light guide plate in a backlight module. The optical film set includes a lower prism film and an upper prism film. The lower prism film has plural lower prism structures, and each of the lower prism structures extends along a first direction. The upper prism film is disposed above the lower prism film. The upper prism film has plural upper prism structures, and each of the upper prism structures extends along a second direction. The second direction is different from the first direction. There is an included angle between the second direction and an extending direction of a light-incident surface of the light guide plate. The included angle is in a range from 25 degrees to 50 degrees or a range from 130 degrees to 155 degrees including the end point values.
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