LED DISPLAY DEVICE

WIPO Patent Application WO/2023/120321

A1

Provided is an LED display device capable of improving light use efficiency with a small number of constituent elements and a simple configuration. This LED display device comprises: an LED array formed by arranging, on a substrate, a plurality of light-emitting diodes for emitting excitation light of wavelengths shorter than 420 nm; a color conversion layer; a wavelength-selective reflection layer disposed on the side opposite to the LED array of the color conversion layer; and an RGB reflection layer disposed closer to the LED array side than the color conversion layer. The color conversion layer has a red conversion region for emitting red light, a green conversion region for emitting green light, and a blue conversion region for emitting blue light, which are respectively disposed at positions corresponding to the light-emitting diodes of the LED array and excited by the excitation light, and further has partition walls that demarcate the respective regions. The height h of the partition walls is 20 μm or less, the ratio w/h of a width w between the partition walls to the height is 2 or more, the wavelength-selective reflection layer selectively reflects light of the wavelength of the excitation light and is integrally formed at a position corresponding to each of the regions, and the RGB reflection layer reflects light of wavelengths of at least 450-650 nm.

KANEKO WAKAHIKO (JP)
MAJIMA WATARU (JP)
OBA TATSUYA (JP)

PCT/JP2022/046033

June 29, 2023

December 14, 2022

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FUJIFILM CORP (JP)

G09F9/33; G02B5/20; G02B5/26; G02B5/28; G09F9/30; H01L33/50; H01L33/60

JP2021131527A	2021-09-09
JP2014165062A	2014-09-08
JP2019028380A	2019-02-21
US5952681A	1999-09-14

ITOH Hideaki et al. (JP)

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