OPERATING SOLID-STATE LIGHTING ELEMENTS
First Claim
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1. A method of operating a lighting device, the method comprising the steps of:
- (a) acquiring a target brightness level of at least one solid-state lighting unit,(b) determining a reference driving current amplitude for obtaining the target brightness level and an optimum driving current amplitude; and
(c) driving the solid-state lighting unit with a pulse-width modulated optimum driving current amplitude when the reference driving current amplitude does not exceed the optimum driving current amplitude to obtain the target brightness level.
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Abstract
Operating a lighting device by acquiring a target brightness level of at least one solid-state lighting unit, and determining a reference driving current amplitude for obtaining the target brightness level. If the reference driving current amplitude is below an optimum driving current amplitude, the solid-state lighting unit is operated at the optimum driving current amplitude, which is pulse-width modulated to obtain the target brightness level.
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Citations
11 Claims
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1. A method of operating a lighting device, the method comprising the steps of:
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(a) acquiring a target brightness level of at least one solid-state lighting unit, (b) determining a reference driving current amplitude for obtaining the target brightness level and an optimum driving current amplitude; and (c) driving the solid-state lighting unit with a pulse-width modulated optimum driving current amplitude when the reference driving current amplitude does not exceed the optimum driving current amplitude to obtain the target brightness level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A lighting device, comprising:
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(a) a solid-state lighting unit, (b) an acquisition unit for determining a target brightness level of at least one solid-state lighting unit, (c) a determination unit for determining a reference driving current amplitude for obtaining the target brightness level, and (d) a driving unit configured to compare the reference driving current amplitude and the optimum driving current amplitude and to drive the solid-state lighting unit with a pulse-width modulated optimum driving current amplitude when the reference driving current amplitude does not exceed the optimum driving current amplitude to obtain the target brightness level.
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11. A computer program product tangibly embodied in a record carrier, the computer program product comprising instructions which, when executed, cause at least one processor to perform the steps of:
- acquiring a target brightness level of at least one solid-state lighting unit, determining a reference driving current amplitude for obtaining the target brightness level and an optimum driving current amplitude; and
driving the solid-state lighting unit with a pulse-width modulated optimum driving current amplitude when the reference driving current amplitude is smaller than or equal to does not exceed the optimum driving current amplitude to obtain the target brightness level.
- acquiring a target brightness level of at least one solid-state lighting unit, determining a reference driving current amplitude for obtaining the target brightness level and an optimum driving current amplitude; and
Specification