Multi-colored Illumination System with Wavelength Converter

The patent segments the white light generation process into two independent parts: (1) a blue LED array that generates high-efficiency blue light, and (2) a wavelength conversion layer that converts part of the blue light to yellow light. This segmentation allows the system to operate at the peak efficiency of blue LEDs while obtaining white light through optical conversion, avoiding the efficiency losses of combining multiple colored LEDs.

The patent introduces a wavelength conversion layer as an intermediary between the blue LED and the final white light output. This layer contains phosphors that absorb blue light and re-emit yellow light, acting as a mediator to transform the blue light into white light with high efficiency. The intermediary approach allows efficient energy transfer while achieving the desired spectral output.

The patent merges multiple blue LED chips into a single integrated LED array structure that shares a common heat dissipation substrate. By combining multiple high-power blue LEDs on one substrate with unified thermal management, the system achieves high luminous flux while controlling heat generation more effectively than separate LED arrays would allow.

The patent changes the operating parameters by using only blue LEDs operating at their optimal efficiency point, rather than combining multiple colored LEDs each operating at suboptimal points. This parameter change - using a single color LED with wavelength conversion - allows higher overall power output with better thermal management since the system operates fewer components at peak efficiency.