| CPC G02F 1/133514 (2013.01) [C09K 11/665 (2013.01); C09K 11/883 (2013.01); G02B 6/005 (2013.01); G02F 1/133614 (2021.01); B82Y 20/00 (2013.01)] | 10 Claims |
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1. A display device comprising: a light source (A); a color conversion layer (B); and a color filter (C),
wherein the color conversion layer (B) contains quantum dots (B-r) that emit red light,
the color filter (C) has a blue color filter (C-b), a green color filter (C-g), and a red color filter (C-r), and
the display device satisfies the following conditions (I) and (II):
α≤1.80; and (I)
β≥63.0, (II)
wherein
α=αb+αg+αr, and
β=βb+βg+βr;
in a spectrum curve I(x) obtained by plotting intensity I of light emitted from the color conversion layer (B) when the color conversion layer (B) is irradiated with light from the light source (A) versus wavelength x,
when a pulse function that gives 0 in wavelength ranges of 380 nm≤x<440 nm, 460 nm<x<520 nm, 540 nm<x<620 nm, and 650 nm<x≤780 nm, and gives a value equal to the maximum intensity of the spectrum curve I(x) in wavelength ranges of 440 nm≤x≤460 nm, 520 nm≤x≤540 nm, and 620 nm≤x≤650 nm is expressed by a function f(x),
αb represents a proportion of a region that does not overlap with a region of the function f(x) in a region of the spectrum curve I(x) in a wavelength range of 380 nm≤x<495 nm,
αg represents a proportion of a region that does not overlap with a region of the function f(x) in a region of the spectrum curve I(x) in a wavelength range of 495 nm≤x≤585 nm, and
αr represents a proportion of a region that does not overlap with a region of the function f(x) in a region of the spectrum curve I(x) in a wavelength range of 585 nm<x≤780 nm; and
in a spectrum curve Tb(x) obtained by plotting light transmittance Tb of the blue color filter (C-b) versus wavelength x,
in a spectrum curve Tg(x) obtained by plotting light transmittance Tg of the green color filter (C-g) versus wavelength x, and
in a spectrum curve Tr(x) obtained by plotting light transmittance Tr of the red color filter (C-r) versus wavelength x,
when a pulse function that gives 0 in wavelength ranges of 380 nm≤x<440 nm, 460 nm<x<520 nm, 540 nm<x<620 nm, and 650 nm<x≤780 nm, and gives a light transmittance of 100% in wavelength ranges 440 nm≤x≤460 nm, 520 nm≤x≤540 nm, and 620 nm≤x≤650 nm is represented by a function g(x),
βb represents an area of a region where a region of the spectrum curve Tb(x) and a region of the function g(x) overlap in the wavelength range of 440 nm≤x≤460 nm,
βg represents an area of a region where a region of the spectrum curve Tg(x) and a region of the function g(x) overlap in the wavelength range of 520 nm≤x≤540 nm, and
βr represents an area of a region where a region of the spectrum curve Tr(x) and a region of the function g(x) overlap in the wavelength range of 620 nm≤x≤650 nm.
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