LED Light Source Unit for Uniform White Illumination
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Solution Overview
Problem
Existing illuminating apparatuses using light emitting diodes (LEDs) face challenges in achieving high light utilization efficiency and color uniformity for white light production, particularly when using red, green, and blue LEDs, due to increased mounting costs and reliability issues, as well as inefficiencies in color mixing.
Innovation Solution
A light source unit comprising light emitting diode chips of different colors connected in series on lead frames, sealed with a transparent sealer, and arranged in an array with a diffuser panel to enhance light mixing and uniformity, reducing mounting complexity and costs while improving light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diodes are packaged and mounted on a printed circuit board, then the light output can be increased, but the mounting cost increases and reliability decreases due to double mounting
Solution Approach 1:
The patent combines multiple light emitting diodes of different colors (red, green, blue) into a single integrated package structure. This merging eliminates the need for separate packaging and mounting of individual LEDs, thereby reducing mounting steps from double mounting to single mounting, improving reliability while maintaining high light output through the combined emission of multiple diodes.
2Illumination intensity
If light emitting diodes are packaged and mounted on a printed circuit board, then the light output can be increased, but the mounting cost increases
Solution Approach 1:
The patent combines multiple light emitting diodes of different colors (red, green, blue) into a single integrated package structure. This merging eliminates the need for separate packaging and mounting of individual LEDs, thereby reducing mounting steps from double mounting to single mounting, improving reliability while maintaining high light output through the combined emission of multiple diodes.
3Illumination intensity
If red, green, and blue light emitting diodes are used for white illumination, then multiple colors can be generated, but the thickness increases due to lack of color mixing means
Solution Approach 1:
The patent combines multiple light emitting diodes of different colors (red, green, blue) into a single integrated package structure. This merging eliminates the need for separate packaging and mounting of individual LEDs, thereby reducing mounting steps from double mounting to single mounting, improving reliability while maintaining high light output through the combined emission of multiple diodes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a thin, cost-effective white light source with high light utilization efficiency and color uniformity, suitable for non-light emitting image display panels, by efficiently mixing red, green, and blue light emissions.
Implementation Method 1
light emitting diode chips, a plurality of light emitting diode chips for radiating light of the same color are connected in series to each set of lead frames. The light emitting diode chips in at least three different colors
Implementation Method 2
a plurality of light emitting diode chips for radiating light of the same color are connected in series to each set of lead frames. The light emitting diode chips in at least three different colors are integrally sealed with the transparent sealer
Data Source
AI summary
A thin light source unit employs a plurality of light emitting diode chips in multiple colors to generate highly uniform white light at a low cost and with a high light utilization efficiency. The light source unit has light emitting diode chips, lead frames, and a transparent sealer. A plurality of the light emitting diode chips in the same color are connected in series to three or more sets of the lead frames. The light emitting diode chips in at least three different colors are integrally sealed with the transparent sealer. An illuminating apparatus using the light source units, and a display apparatus using the illuminating apparatus are also provided.