LIGHT SOURCE INTENSITY CONTROL SYSTEM AND METHOD
First Claim
1. A light source for generating a desired colour of light, said light source comprising:
- a) one or more first light-emitting elements for generating first light having a first wavelength range, the one or more first light-emitting elements responsive to a first control signal;
b) one or more second light-emitting elements for generating second light having a second wavelength range, the one or more second light-emitting elements responsive to a second control signal;
c) one or more sensing devices for generating one or more signals representative of operating temperatures of the one or more first light-emitting elements and the one or more second light-emitting elements; and
d) a control system operatively coupled to the one or more first light-emitting elements, the one or more second light-emitting elements and the one or more sensing devices, the control system configured to receive the one or more signals and configured to determine the first control signal and the second control signal based upon the operating temperatures and the desired colour of light;
wherein the first light and the second light are blended to create the desired colour of light.
4 Assignments
0 Petitions
Accused Products
Abstract
The light source comprises one or more first light-emitting elements for generating light having a first wavelength range and one or more second light-emitting elements for generating light having a second wavelength range. The first light-emitting elements and second light-emitting elements are responsive to separate control signals provided thereto. A control system receives a signal representative of the operating temperature from one or more sensing devices and determines first and second control signals based on the desired colour of light and the operating temperature. The light emitted by the first and second light-emitting elements as a result of the received first and second control signals can be blended to substantially obtain the desired colour of light. The desired colour of light generated can thus be substantially independent of junction temperature induced changes in the operating characteristics of the light-emitting elements.
87 Citations
31 Claims
-
1. A light source for generating a desired colour of light, said light source comprising:
-
a) one or more first light-emitting elements for generating first light having a first wavelength range, the one or more first light-emitting elements responsive to a first control signal; b) one or more second light-emitting elements for generating second light having a second wavelength range, the one or more second light-emitting elements responsive to a second control signal; c) one or more sensing devices for generating one or more signals representative of operating temperatures of the one or more first light-emitting elements and the one or more second light-emitting elements; and d) a control system operatively coupled to the one or more first light-emitting elements, the one or more second light-emitting elements and the one or more sensing devices, the control system configured to receive the one or more signals and configured to determine the first control signal and the second control signal based upon the operating temperatures and the desired colour of light; wherein the first light and the second light are blended to create the desired colour of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A method for generating a desired colour of light, the method comprising the steps of:
-
a) determining a first operating temperature of one or more first light-emitting elements which provide first light having a first spectrum; b) determining a second operating temperature of one or more second light-emitting elements which provide second light having a second spectrum; c) providing a first spectral radiant intensity model indicative of effects of the first operating temperature on the first spectrum; d) providing a second spectral radiant intensity model indicative of effects of the second operating temperature on the second spectrum; e) determining a first control signal and a second control signal based upon the first spectral radiant intensity model, the second spectral radiant intensity model, the desired colour of light and the first operating temperature and second operating temperature; f) providing the first control signal to the one or more first light-emitting elements; g) providing the second control signal to the one or more second light-emitting elements; and h) blending the first light and the second light into mixed light having the desired colour of light. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification