Liquid crystal display device with red, green, and blue light emitting diodes connected in series
An exemplary liquid crystal display device includes a liquid crystal display panel and a backlight module. The backlight module includes a driving circuit and a light emitting diode array. The driving circuit includes a first terminal, and the light emitting diode array includes a plurality of red, green, and blue light emitting diodes connected in series. A number of the red light emitting diodes is “a”, and a number of the green light emitting diodes is “b”. Further, a number of the blue light emitting diodes is “c”. Numbers of “a”, “b”, and “c” are determined according to a predetermined color coordinate of the liquid crystal panel. The driving circuit drives the red, green, and blue light emitting diodes via the first terminal, to enable the red, green, and blue light emitting diodes to emit light beams for illuminating the liquid crystal display panel.
1 . A liquid crystal display device, comprising:
a liquid crystal display panel; and
a backlight module comprising a driving circuit and a light emitting diode array, the driving circuit comprising a first terminal, and the light emitting diode array comprising a plurality of red, green, and blue light emitting diodes connected in series;
wherein a number of the red light emitting diodes is “a”, a number of the green light emitting diodes is “b”, and a number of the blue light emitting diodes is “c”, numbers of “a”, “b”, and “c” are determined according to a predetermined color coordinate of the liquid crystal panel; the driving circuit drives the red, green, and blue light emitting diodes via the first terminal, to enable the red, green, and blue light emitting diodes to emit light beams for illuminating the liquid crystal display panel.
2 . The liquid crystal display device as claimed in claim 1 , wherein the driving circuit comprises a micro modulating unit and a second terminal, and the driving circuit drives the slightly modulating unit via the second terminal.
3 . The liquid crystal display device as claimed in claim 2 , wherein the micro modulating unit comprises at least one of the red, green, and blue light emitting diodes.
4 . The liquid crystal display device as claimed in claim 1 , wherein a spectrum of the red light emitting diodes is S(R), a spectrum of the green light emitting diodes is S(G), and a spectrum of the blue light emitting diodes is S(B); the liquid crystal display panel has a penetration spectrum of τ R (λ) while displaying red images, a penetration spectrum of τ G (λ) while displaying green images, and a penetration spectrum of τ B (λ) while displaying blue images; the liquid crystal panel has chromaticity coordinates of (xR, yR) while displaying red images, chromaticity coordinates of (xG, yG) while displaying green images, and chromaticity coordinates of (xB, yB) while displaying blue images; spectral tristimulus values are x (λ), y (λ), z (λ); and “A”, “B”, and “C” represent unknown number, and A:B:C is determined by the following equation:
{
Xi
n
=
S
(
n
)
τ
n
(
λ
)
x
_
(
λ
)
Yi
n
=
S
(
n
)
τ
n
(
λ
)
y
_
(
λ
)
Zi
n
=
S
(
n
)
τ
n
(
λ
)
z
_
(
λ
)
i
=
1
,
2
,
3
n
=
R
,
G
,
B
XRR
=
(
A
,
B
,
C
)
·
[
X
1
R
X
2
R
X
3
R
]
XGR
=
(
A
,
B
,
C
)
·
[
X
1
G
X
2
G
X
3
G
]
XBR
=
(
A
,
B
,
C
)
·
[
X
1
B
X
2
B
X
3
B
]
YRG
=
(
A
,
B
,
C
)
·
[
Y
1
R
Y
2
R
Y
3
R
]
YGG
=
(
A
,
B
,
C
)
·
[
Y
1
G
Y
2
G
Y
3
G
]
YBG
=
(
A
,
B
,
C
)
·
[
Y
1
B
Y
2
B
Y
3
B
]
ZRB
=
(
A
,
B
,
C
)
·
[
Z
1
R
Z
2
R
Z
3
R
]
ZGB
=
(
A
,
B
,
C
)
·
[
Z
1
G
Z
2
G
Z
3
G
]
ZBB
=
(
A
,
B
,
C
)
·
[
Z
1
B
Z
2
B
Z
3
B
]
xR
=
XRR
XRR
+
YRG
+
ZRB
,
yR
=
YRG
XRR
+
YRG
+
ZRB
xG
=
XGR
XGR
+
YGG
+
ZGB
,
yG
=
YGG
XGR
+
YGG
+
ZGB
xB
=
XBR
XBR
+
YBG
+
ZBB
,
yB
=
YBG
XBR
+
YBG
+
ZBB
the numbers “a”, “b”, and “c” are the integer solution of the value of A:B:C in a permissible error.
5 . The liquid crystal display device as claimed in claim 4 , wherein chromaticity coordinates and spectral tristimulus values are defined according to the standard colorimeter system of 1931CIE-XYZ.
6 . The liquid crystal display device as claimed in claim 4 , wherein the value of A:B:C is set as 1:2:1 via modulating the spectrum of the red, green, and blue light emitting diodes.
7 . The liquid crystal display device as claimed in claim 4 , wherein the liquid crystal panel has a multi-layer structure, a penetration spectrum of the liquid crystal panel is a product of each of the penetration spectrums of each layer structure thereof.
8 . The liquid crystal display device as claimed in claim 7 , wherein the liquid crystal panel comprises a color filter layer, the color filter layer comprises a plurality of red color units with a penetration spectrum of τ 1R (λ), a plurality of red color units with a penetration spectrum of τ 1G (λ), and a plurality of red color units with a penetration spectrum of τ 1B (λ), a product of penetration spectrums of other layers of the liquid crystal display panel is Πτ i (λ), then the τ R (λ), τ G (λ), and τ B (λ) is illustrated by the following equation:
τ R (λ)=τ 1R (λ)Πτ i (λ),
τ G (λ)=τ 1G (λ)Πτ i (λ),
τ B (λ)=τ 1B (λ)Πτ i (λ).
9 . The liquid crystal display device as claimed in claim 8 , wherein the other layers of the liquid crystal panel comprises a first polarizer, a second polarizer, a liquid crystal layer, a first alignment film, a second alignment film.
10 . The liquid crystal display device as claimed in claim 9 , wherein the other layers of the liquid crystal panel further comprises a common electrode and a pixel electrode.
11 . The liquid crystal display device as claimed in claim 1 , wherein the first terminal outputs a driving voltage higher than that outputted by the second terminal.