US 12,123,781 B2Granted

Electronic device, method and apparatus for measuring color temperature of ambient light, and storage medium

AssigneeBeijing Xiaomi Mobile Software Co., Ltd.

InventorLi Guo

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Abstract

Aspects of the disclosure relate to an electronic device, a method and an apparatus for measuring color temperature of ambient light, and a storage medium. The electronic device can include a display screen, a first color temperature sensor and a second color temperature sensor that are arranged side by side under the display screen, and a filter element that is located between the second color temperature sensor and the display screen to filter ambient light incident on the second color temperature sensor. The device can further include a processing element that is connected with the first color temperature sensor and the second color temperature sensor respectively to determine ambient light color temperature of an environment where the electronic device is located according to a first color temperature signal value detected by the first color temperature sensor and a second color temperature signal value detected by the second color temperature sensor.

Claims19

Dependent claims

An electronic device, comprising:

a display screen;
a first color temperature sensor and a second color temperature sensor that are arranged side by side at intervals under the display screen, wherein an interval between the first color temperature sensor and the second color temperature sensor is set to be within a preset range;
a filter element that is located between the second color temperature sensor and the display screen to filter ambient light incident on the second color temperature sensor;
a processing element that is coupled with the first color temperature sensor and the second color temperature sensor, respectively, to determine color temperature of ambient light of an environment where the electronic device is located based on a first color temperature signal value detected by the first color temperature sensor and a second color temperature signal value detected by the second color temperature sensor,
wherein a matrix algorithm is used to determine the color temperature of the ambient light according to the first color temperature signal value and the second color temperature signal value, steps of the matrix algorithm are as follows:
[
C
11
C
12
C
13
C
14
C
15
C
21
C
22
C
23
C
24
C
25
C
31
C
32
C
33
C
34
C
35
]
*
[
C
R
G
B
W
]
=
[
X
Y
Z
]
(
1
)
where, a matrix composed of C11 to C35 is a processing matrix;
C, R, G, B and W are values acted by the ambient light determined based on the first color temperature signal value and the second color temperature signal value;
obtained X, Y and Z are tristimulus values;
acquiring corresponding values under x and y color coordinates based on the obtained tristimulus values according to following formula (2):
x
=
X
X
+
Y
+
Z
y
=
Y
X
+
Y
+
Z
(
2
)
calculating the color temperature of the ambient light T by polynomial calculation based on the obtained corresponding values under the x and y color coordinates by following formula (3):
T
=
-
449
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
3
+
3525
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
2
-
6
823.3
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
1
+
5
⁢
5
⁢
2
⁢
0
⁢
.33
.
(
3
)

169 more elements

A method for measuring color temperature of ambient light that is applied to an electronic device having a display screen, the method comprising:

acquiring a first color temperature signal value detected by a first color temperature sensor, the first color temperature signal value being formed by display light of the display screen acting on the first color temperature sensor alone after ambient light is filtered by a filter element;
acquiring a second color temperature signal value detected by a second color temperature sensor, the second color temperature signal value being formed by the ambient light and the display light jointly acting on the second color temperature sensor;
and
determining the color temperature of the ambient light according to the first color temperature signal value and the second color temperature signal value,
wherein the first color temperature sensor and the second color temperature sensor are arranged side by side at intervals under the display screen, and an interval between the first color temperature sensor and the second color temperature sensor is set to be within a preset range,
wherein a matrix algorithm is used to determine the color temperature of the ambient light according to the first color temperature signal value and the second color temperature signal value, steps of the matrix algorithm are as follows:
[
C
11
C
12
C
13
C
14
C
15
C
21
C
22
C
23
C
24
C
25
C
31
C
32
C
33
C
34
C
35
]
*
[
C
R
G
B
W
]
=
[
X
Y
Z
]
(
1
)
where, a matrix composed of C11 to C35 is a processing matrix;
C, R, G, B and W are values acted by the ambient light determined based on the first color temperature signal value and the second color temperature signal value;
obtained X, Y and Z are tristimulus values;
acquiring corresponding values under x and y color coordinates based on the obtained tristimulus values according to following formula (2):
x
=
X
X
+
Y
+
Z
y
=
Y
X
+
Y
+
Z
(
2
)
calculating the color temperature of the ambient light T by polynomial calculation based on the obtained corresponding values under the x and y color coordinates by following formula (3):
T
=
-
449
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
3
+
3525
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
2
-
6
823.3
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
1
+
5
⁢
5
⁢
2
⁢
0
⁢
.33
.
(
3
)

170 more elements

An apparatus for measuring color temperature of ambient light, comprising:

a processor;
a memory for storing instructions executable by the processor,
wherein the processor is configured to:
acquire a first color temperature signal value detected by a first color temperature sensor, the first color temperature signal value being formed by display light of the display screen acting on the first color temperature sensor alone after ambient light is filtered by a filter element;
acquire a second color temperature signal value detected by a second color temperature sensor, the second color temperature signal value being formed by the ambient light and the display light jointly acting on the second color temperature sensor;
and
determine the color temperature of the ambient light according to the first color temperature signal value and the second color temperature signal value,
wherein the first color temperature sensor and the second color temperature sensor are arranged side by side at intervals under the display screen, and an interval between the first color temperature sensor and the second color temperature sensor is set to be within a preset range,
wherein a matrix algorithm is used to determine the color temperature of the ambient light according to the first color temperature signal value and the second color temperature signal value, steps of the matrix algorithm are as follows:
[
C
11
C
12
C
13
C
14
C
15
C
21
C
22
C
23
C
24
C
25
C
31
C
32
C
33
C
34
C
35
]
*
[
C
R
G
B
W
]
=
[
X
Y
Z
]
(
1
)
where, a matrix composed of C11 to C35 is a processing matrix;
C, R, G, B and W are values acted by the ambient light determined based on the first color temperature signal value and the second color temperature signal value;
obtained X, Y and Z are tristimulus values;
acquiring corresponding values under x and y color coordinates based on the obtained tristimulus values according to following formula (2);
x
=
X
X
+
Y
+
Z
y
=
Y
X
+
Y
+
Z
(
2
)
calculating the color temperature of the ambient light T by polynomial calculation based on the obtained corresponding values under the x and y color coordinates by following formula (3):
T
=
-
449
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
3
+
3525
*
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
2
-
6
823.3
(
x
-
0
.
3
⁢
3
⁢
2
y
-
0
.
1
⁢
8
⁢
5
⁢
8
)
1
+
5
⁢
5
⁢
2
⁢
0
⁢
.33
.
(
3
)

173 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/166,471Filed 3 Feb 2021
Priority: CN 202010575901.922 Jun 2020
Published: US 2021/0396589 A123 Dec 2021
Granted: 22 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G01J 3/513
Using colour filters: having fixed filter-detector pairs
G01J 5/60
Radiation pyrometry, e.g. infrared or optical thermometry: using determination of colour temperature
G01J 1/0429
Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings: using polarisation elements
G01J 1/4204
Using electric radiation detectors: with determination of ambient light