US Patent No. 10,557,970

QUANTUM DOT PROTECTIVE FILM, AND WAVELENGTH CONVERSION SHEET AND BACKLIGHT UNIT OBTAINED BY USING THE SAME


Patent No. 10,557,970
Issue Date February 11, 2020
Title Quantum Dot Protective Film, And Wavelength Conversion Sheet And Backlight Unit Obtained By Using The Same
Inventorship Koji Murata, Tokyo (JP)
Kenji Matsumasa, Tokyo (JP)
Kengo Okamura, Tokyo (JP)
Satoshi Iwata, Tokyo (JP)
Masato Kurokawa, Tokyo (JP)
Assignee TOPPAN PRINTING CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,557,970

1. A quantum dot protective film for sealing a phosphor, comprising:a protective layer having foreign matter, a maximum size of which is 100 to 500 ?m; and
a coating layer formed on one surface of the protective layer, wherein
an abundance ratio of the foreign matter with the maximum size of 100 to 500 ?m is 0.01 to 5.0 particles/m2 in the protective layer, and
the haze value is 20% or higher, wherein the foreign matter is optically different from other portions of the protective layer.