| 摘要 |
<p>A light emitting module 200 (500, figure 5) employs non-identical, unmatched devices 202, 203 in two device strings 201, 203 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 (figures 2 and 2F) 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 string may contain non light emitting device for example a transistor, diode, resistor integrated circuit or operational amplifier. 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 the amount of electrical activation. Also, 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 200. In another embodiment a third device string is arranged in parallel to the two previously described device strings. No complex active electrical regulation, monitoring or feedback to the individual strings of LEDs is required.</p> |
