Lighting system
First Claim
1. A lighting system comprising:
- a first light emitting element including a plurality of light emitting units;
a second light emitting element;
a first control circuit which controls light emission of the first light emitting element; and
a second control circuit which controls light emission of the second light emitting element, wherein the first light emitting element emits light having a first emission color at a start of light emission and light having a second emission color after change over time, and wherein the second light emitting element emits light having a complementary color of the second emission color.
1 Assignment
0 Petitions
Accused Products
Abstract
An object of the present invention is to provide a lighting system which uses a stacked light emitting element provided with a plurality of light emitting units and causes little change in emission color even after being used for a long time. A lighting system is provided, which includes a first light emitting element including a plurality of light emitting units; a second light emitting element; a first control means which controls light emission of the first light emitting element; and a second control means which controls light emission of the second light emitting element, where the first light emitting element emits light of a first emission color that is an initial emission color and a second emission color that is an emission color after change over time, and the second light emitting element emits light of a complementary color of the second emission color. With the above structure, color shift due to change over time can be suppressed.
-
Citations
32 Claims
-
1. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element;
a first control circuit which controls light emission of the first light emitting element; and
a second control circuit which controls light emission of the second light emitting element, wherein the first light emitting element emits light having a first emission color at a start of light emission and light having a second emission color after change over time, and wherein the second light emitting element emits light having a complementary color of the second emission color. - View Dependent Claims (7, 13, 19)
-
-
2. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element;
a first control circuit which controls light emission of the first light emitting element; and
a second control circuit which controls light emission of the second light emitting element, wherein the second light emitting element comprises a light emitting unit formed of the same material as that of a light emitting unit having short life among the plurality of light emitting units of the first light emitting element. - View Dependent Claims (8, 14, 20)
-
-
3. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element; and
a control circuit which controls light emission of the second light emitting element in accordance with a change in emission color of the first light emitting element, wherein the first light emitting element emits light having a first emission color at a start of light emission and light having a second emission color after change over time, and wherein the second light emitting element emits light having a complementary color of the second emission color. - View Dependent Claims (9, 15, 21)
-
-
4. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element; and
a control circuit which controls light emission of the second light emitting element in accordance with a change in emission color of the first light emitting element, wherein the second light emitting element comprises a light emitting unit formed of the same material as that of a light emitting unit having short life among the plurality of light emitting units of the first light emitting element. - View Dependent Claims (10, 16, 22)
-
-
5. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element; and
a control circuit, wherein the control circuit suppresses a change in total luminance of the first light emitting element and the second light emitting element by intensifying a luminance of the second light emitting element in accordance with a change in luminance of the first light emitting element from a first luminance at a start of light emission to a second luminance after change over time. - View Dependent Claims (11, 17, 23)
-
-
6. A lighting system comprising:
-
a first light emitting element including a plurality of light emitting units;
a second light emitting element; and
a control circuit, wherein the control circuit adjusts a luminance of the second light emitting element after t hours so as to satisfy Formula (1) when a luminance of the first light emitting element at a start of light emission is denoted by Ltotal(0), a luminance of the first light emitting element after t hours by Ltotal(t), an amount of change in luminance of a monitor element between at a start of light emission and after t hours by Δ
Lmon, and the luminance of the second light emitting element after t hours by Δ
L2,
Δ
L2=Ltotal(0)−
Ltotal(t)−
α
·
Δ
Lmon(1)where α
is a factor with respect to luminance of the monitor element. - View Dependent Claims (12, 18, 24)
-
-
25. A driving method of a lighting system comprising the steps of:
-
emitting light having a first emission color from a first light emitting element including a plurality of light emitting units at a start of light emission;
emitting light having a second emission color from the first light emitting element after change over time; and
emitting light having a complementary color of the second emission color from a second light emitting element, wherein a control circuit controls light emission of the second light emitting element in accordance with a change in the first emission color and the second emission color of the first light emitting element. - View Dependent Claims (27, 29, 31)
-
-
26. A driving method of a lighting system comprising the steps of:
-
emitting light having a first emission color from a first light emitting element including a plurality of light emitting units at a start of light emission;
emitting light having a second emission color from the first light emitting element after change over time; and
emitting light having a complementary color of the second emission color from a second light emitting element, wherein a control circuit suppresses a change in total luminance of the first light emitting element and the second light emitting element by intensifying the light of the second light emitting element in accordance with a change in luminance of the first light emitting element from a first luminance at the start of light emission to a second luminance after the change over time. - View Dependent Claims (28, 30, 32)
-
Specification