ILLUMINATION SYSTEM WITH FOUR PRIMARIES
First Claim
Patent Images
1. Illumination system (10), comprising:
- four lamps (12A, 12B, 12C, 12D), each lamp (12A, 12B, 12C, 12D) generating light (16A, 16B, 16C, 16D) with a respective color point (C1, C2, C3, C4) having color coordinates ((x(1),y(1)), (x(2),y(2)), (x(3),y(3)), (x(4),y(4))) and having a nominal output intensity (L(1), L(2), L(3), L(4));
four lamp drivers (13A, 13B, 13C, 13D) associated with the respective lamps, each lamp driver capable of driving its corresponding lamp with a dim factor (ξ
1, ξ
2, ξ
3, ξ
4);
a common controller (15) for generating control signals for the lamp drivers (13A, 13B, 13C, 13D) such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;
wherein the controller (15) is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates (xT,yT) by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;
wherein the controller (15) is designed to select one of the lamps (12D) to be a basic lamp, to set the dim factor (ξ
4) of this basic lamp to be equal to 1, to calculate an optimum solution for the other three dim factors (ξ
1S, ξ
2S, ξ
3S) as a function of the target chromaticity coordinates (xT,yT), for the maximum allowed value of the luminance (YMAX) for which 0≦
ξ
≦
1 applies for each of said dim factors (ξ
1S, ξ
2S, ξ
3S).
3 Assignments
0 Petitions
Accused Products
Abstract
An illumination system (10), comprising:—four lamps (12A, 12B, 12C, 12D);—four lamp drivers (13A, 13B, 13C, 13D) capable of driving their corresponding lamps with respective dim factors (ξ1, ξ2, ξ3, ξ4);—a common controller (15) for controlling the dim factors of the respective lamps. The controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates (xT, yT) and target brightness (BT). The controller sets the dim factor (ξ4) of one lamp to be equal to 1, and calculates an optimum solution for the other three dim factors as a function of the target chromaticity coordinates (xT, yT), for the maximum allowed value of the luminance (YMAX) for which 0≦ξ≦1 applies for each of said dim factors (ξ1S, ξ2S, ξ3S).
40 Citations
5 Claims
-
1. Illumination system (10), comprising:
-
four lamps (12A, 12B, 12C, 12D), each lamp (12A, 12B, 12C, 12D) generating light (16A, 16B, 16C, 16D) with a respective color point (C1, C2, C3, C4) having color coordinates ((x(1),y(1)), (x(2),y(2)), (x(3),y(3)), (x(4),y(4))) and having a nominal output intensity (L(1), L(2), L(3), L(4)); four lamp drivers (13A, 13B, 13C, 13D) associated with the respective lamps, each lamp driver capable of driving its corresponding lamp with a dim factor (ξ
1, ξ
2, ξ
3, ξ
4);a common controller (15) for generating control signals for the lamp drivers (13A, 13B, 13C, 13D) such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;wherein the controller (15) is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates (xT,yT) by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;wherein the controller (15) is designed to select one of the lamps (12D) to be a basic lamp, to set the dim factor (ξ
4) of this basic lamp to be equal to 1, to calculate an optimum solution for the other three dim factors (ξ
1S, ξ
2S, ξ
3S) as a function of the target chromaticity coordinates (xT,yT), for the maximum allowed value of the luminance (YMAX) for which 0≦
ξ
≦
1 applies for each of said dim factors (ξ
1S, ξ
2S, ξ
3S).- View Dependent Claims (2, 3, 4, 5)
while the controller (15) uses the dim factors (ξ -
1S, ξ
2S, ξ
3S, ξ
4S) corresponding with said optimum luminance value to calculate the target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T).
-
5. Illumination system according to claim 4, wherein the controller (15) is responsive to an input signal indicating a target brightness (BT) by calculating said target dim factors (ξ
-
1T, ξ
2T, ξ
3T, ξ
4T) according to
ξ
1T=BT·
ξ
1S
ξ
2T=BT·
ξ
2S
ξ
3T=BT·
ξ
3S
ξ
4T=BT·
ξ
4S
-
1T, ξ
-
Specification
-
- Resources
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Current AssigneePhilips Lighting BV (Koninklijke Philips N.V.)
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Original AssigneeKoninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
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InventorsDelnoij, Roger Peter Anna
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current315/294
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CPC Class CodesH05B 45/20 Controlling the colour of t...H05B 45/24 using electrical feedback f...
