LIGHTING DEVICE WITH CONTROLLABLE LIGHT INTENSITY
First Claim
1. A lighting device comprising:
- at least one alternating current source (201, 420a-z, 430l-z, 501, 511, 601) configured to provide alternating current of at least a first and a second frequency,at least one light source,at least one impedance unit (106, 206, 606a-c) connected to said light source, affecting a first current from said at least one alternating current source to flow through said at least one light source,wherein an impedance of said impedance unit (106, 206, 606a-c) is configured to be frequency controlled, such that when said alternating current is of said first frequency said first current is relatively high and when said alternating current is of said second frequency said first current is relatively low.
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Accused Products
Abstract
It is presented a lighting device comprising: at least one alternating current source configured to provide alternating current of at least a first and a second frequency, at least one light source, at least one impedance unit connected to the light source, affecting a first current from the at least one alternating current source to flow through the at least one light source, wherein an impedance of the impedance unit is configured to be frequency controlled, such that when the alternating current is of the first frequency the first current is relatively high and when the alternating current is of the second frequency the first current is relatively low. A corresponding display device, television device and method are also presented.
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Citations
18 Claims
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1. A lighting device comprising:
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at least one alternating current source (201, 420a-z, 430l-z, 501, 511, 601) configured to provide alternating current of at least a first and a second frequency, at least one light source, at least one impedance unit (106, 206, 606a-c) connected to said light source, affecting a first current from said at least one alternating current source to flow through said at least one light source, wherein an impedance of said impedance unit (106, 206, 606a-c) is configured to be frequency controlled, such that when said alternating current is of said first frequency said first current is relatively high and when said alternating current is of said second frequency said first current is relatively low. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for controlling light intensity of a lighting device, said method comprising the steps of:
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arranging at least one alternating current source (201, 420a-z, 430l-z, 501, 511, 601) configured to provide alternating current of at least a first and a second frequency, connecting at least one light source, connecting at least one impedance unit (106, 206, 606a-c) connected to said light source, affecting a first current from said at least one alternating current source to flow through said at least one light source, controlling an impedance of said impedance unit (106, 206, 606a-c) using frequency control, such that when said alternating current is of said first frequency said first current is relatively high and when said alternating current is of said second frequency said first current is relatively low.
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Specification