| 摘要 |
A light emitting module employs non-identical, unmatched devices in two device strings electrically connected in parallel to provide the ability to passively modify the resultant optical properties of the light emitting module, such as chromaticity and luminance, by simple changes in the electrical activation of the overall light emitting module. Each string comprises at least one electrical device, including at least one light emitting device. The electrical devices are selected such that the ratio of their respective luminous flux and the non-zero difference between their effective resistances varies with amount of electrical activation. Moreover the chromaticity point of each string is different and the colour chromaticity point of the module varies with the amount of electrical activation, such as a constant current supplied to the light emitting module. No complex active electrical regulation, monitoring or feedback of the individual strings of LEDs is required. |
