US 8,040,467 B2 · Blue color composition for color filter, color filter, and color image display device

Abstract

The present invention relates to color image display devices having a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination, where the backlight has a phosphor layer or a phosphor film, and the phosphor layer or the phosphor film has a compound having at least element M4, element A, element D, element E and element X, where M4 is at least one element selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and includes at least Eu, A is at least one element selected from bivalent metal elements other than the element M4, D is at least one element selected from tetravalent metal elements, E is at least one element selected from trivalent metal elements, and X is at least one element selected from O, N and F.

Claims17

Dependent claims

A color image display device comprising a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination,

wherein the backlight has a phosphor layer or a phosphor film, and the phosphor layer or the phosphor film comprises a compound represented by formula (4):
M4fAgDhEiXj (4)
wherein
M4 is at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and comprises at least Eu,
A is at least one element selected from the group consisting of bivalent metal elements other than the element M4,
D is at least one element selected from the group consisting of tetravalent metal elements,
E is at least one element selected from the group consisting of trivalent metal elements,
X is at least one element selected from the group consisting of O, N and F, and f to j are:
0.00001≦f≦0.1
f+g=1
0.5≦h≦1.8
0.5≦i≦1.8
0.8×(2/3+4/3×h+i)≦j
j≦1.2×(2/3+4/3×h+i).

11 more elements

wherein the backlight comprises a LED in its structure, and with the following definitions:
λn represents a wavelength at every interval of 5 nm in the visible light range of from 380 to 780 nm;
TG(λn) a spectral transmittance (%) at a wavelength λn nm by a green pixel of the color filter;
and
I(λn) a relative emission intensity, normalized by a total emission intensity, at a wavelength λn nm from the backlight, TG(λn) and I(λn) satisfy conditions (5) and (6):
I(500-530)×TG(500-530)≧1.2 (5)
TG(580-600)≧20% (6)
wherein TG(500-530), TG(580-600) and I(500-530) represent the average transmittances (%) at 500 nm≦λn≦530 nm and 580 nm≦λn≦600 nm and the average relative emission intensity at 500 nm≦λn≦530 nm, respectively, and I(λn) is as defined as follows:
s
⁢
(
λ
n
)
=
∫
λ
n
-
Δλ
/
2
λ
n
+
Δλ
/
2
⁢
s
⁡
(
λ
)
⁢
ⅆ
λ
Δλ
I
⁡
(
λ
n
)
=
s
⁡
(
λ
n
)
∑
λ
=
380
780
⁢
s
⁡
(
λ
n
)
where S(λ) represents a measured value of emission intensity at a wavelength λ from the backlight, and Δλ=5 nm.

61 more elements

Dependencies are inferred from the claim text.

Blue color composition for color filter, color filter, and color image display device

Life of this patent

Blue color composition for color filter, color filter, and color image display device

Life of this patent

Abstract

Claims17