Lighting device with multiple primary colors
First Claim
1. A lighting device comprising:
- a) a number of N≧
4 light emitters with different primary colors;
b) a target determination unit for determining a number of s<
N secondary target values that are functionally related to driving commands for the light emitters; and
c) a driving unit for determining individual driving commands for the light emitters based on the secondary target values and on a number of p<
N given primary target values for the light output of the lighting device, the driving commands comprising duty cycles of a pulse width modulation,wherein the target determination unit is configured to determine a range of allowable secondary target values in accordance with the driving commands.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a lighting device (10) with at least four light emitters (1 IR, 1 IG, 1 IB, 1 IW) of different primary colors that shall be controlled according to given primary target values, for example target values for the color point (x, y) and flux (Φ). This object is achieved by determining secondary target values, for example for the total power consumption (P) of the light emitters, that are in accordance with primary target values and with the possible control commands (r, g, b, w) (e.g. duty cycles between 0% and 100%). By fixing the secondary target values, the control commands for the light emitters can uniquely be determined, in preferred embodiments by a simple matrix multiplication.
27 Citations
9 Claims
-
1. A lighting device comprising:
-
a) a number of N≧
4 light emitters with different primary colors;b) a target determination unit for determining a number of s<
N secondary target values that are functionally related to driving commands for the light emitters; andc) a driving unit for determining individual driving commands for the light emitters based on the secondary target values and on a number of p<
N given primary target values for the light output of the lighting device, the driving commands comprising duty cycles of a pulse width modulation,wherein the target determination unit is configured to determine a range of allowable secondary target values in accordance with the driving commands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for controlling a lighting device comprising a number of N≧
- 4 light emitters with different primary colors, comprising the steps of
a) determining s<
N secondary target values that are functionally related to driving commands for the light emitters, the driving commands comprising duty cycles of a pulse width modulation; andb) determining individual driving commands for the light emitters based on the secondary target values and on a number of p<
N given primary target values for the light output of the lighting device,wherein determining secondary target values further comprises determining a range of allowable secondary target values in accordance with the driving commands.
- 4 light emitters with different primary colors, comprising the steps of
Specification