Illumination system with four primaries
First Claim
Patent Images
1. Illumination system, comprising:
- four lamps, each lamp generating light with a respective color point having color coordinates and having a nominal output intensity;
four lamp drivers 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 for generating control signals for the lamp drivers such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;
wherein the controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;
wherein the controller is designed to select one of the lamps 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
S, ξ
2S, ξ
3S) as a function of the target chromaticity coordinates, for the maximum allowed value of the luminance for which 0 ≦
ξ
≦
1 applies for each of said dim factors (ξ
1s,ξ
2s, ξ
3s);
wherein the controller 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.
3 Assignments
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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).
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Citations
4 Claims
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1. Illumination system, comprising:
-
four lamps, each lamp generating light with a respective color point having color coordinates and having a nominal output intensity; four lamp drivers 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 for generating control signals for the lamp drivers such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;wherein the controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;wherein the controller is designed to select one of the lamps 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
S, ξ
2S, ξ
3S) as a function of the target chromaticity coordinates, for the maximum allowed value of the luminance for which 0 ≦
ξ
≦
1 applies for each of said dim factors (ξ
1s,ξ
2s, ξ
3s);wherein the controller 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.
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-
2. Illumination system, comprising:
-
four lamps, each lamp generating light with a respective color point having color coordinates and having a nominal output intensity; four lamp drivers 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 for generating control signals for the lamp drivers such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;wherein the controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;wherein the controller is designed to select one of the lamps 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, for the maximum allowed value of the luminance for which 0≦
ξ
≦
1 applies for each of said dim factors (ξ
1S, ξ
2S, ξ
3S);wherein the controller is designed to calculate, for each of the four lamps, the weighed distance (Δ
(i)=L(i)·
√
{square root over ((xT−
x(i))2+(yT−
y(i))2)}{square root over ((xT−
x(i))2+(yT−
y(i))2)}) between that lamps color point and the target color point (T), and to take as basic lamp the one lamp having the shortest weighed distance from the target color point (T).
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3. Illumination system, comprising:
-
four lamps, each lamp generating light with a respective color point having color coordinates and having a nominal output intensity; four lamp drivers 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 for generating control signals for the lamp drivers such as to control the dim factors (ξ
1, ξ
2, ξ
3, ξ
4) of the respective lamps;wherein the controller is responsive to an input signal indicating a target color point (T) having target chromaticity coordinates by calculating target dim factors (ξ
1T, ξ
2T, ξ
3T, ξ
4T) and using these values for controlling the drivers;wherein the controller is designed to select one of the lamps 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, for the maximum allowed value of the luminance for which 0≦
ξ
≦
1 applies for each of said dim factors (ξ
1S, ξ
2S, ξ
3S),wherein the controller is designed to perform four calculation cycles, wherein in each calculation cycle a different lamp is selected to be the basic lamp, wherein in each calculation cycle different values are obtained for the maximum allowed luminance value, and wherein the highest one of these different values is taken as the optimum luminance value while the controller 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
3Tξ
4T). - View Dependent Claims (4)
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Specification
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Current AssigneePhilips Lighting Holding BV (Signify 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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Primary Examiner(s)Tan, Vibol
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Application NumberUS12/517,810Publication NumberTime in Patent Office1,616 DaysField of Search315/112, 315/219, 315/294, 315/297, 315/308, 315/312, 315/318, 315/324, 345/83, 345/590, 345/600, 345/601, 345/690, 362/231, 362/555US Class Current315/294CPC Class CodesH05B 45/20 Controlling the colour of t...H05B 45/24 using electrical feedback f...
