LED Package Wall Structure for Color Mixing and Side Emission Control
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Solution Overview
Problem
Conventional light emitting diode (LED) units struggle to effectively mix light emitted from blue, red, and green LEDs into a desired color, due to difficulties in manufacturing red LEDs and inefficient light emission patterns.
Innovation Solution
A light emitting diode unit is designed with blue, red, and green LED packages on a substrate, each package including a wall to prevent side emission and enhance upward light emission, allowing for easier color balance adjustment by mixing lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LED units emit light to upper surfaces and side surfaces, then light emission is achieved, but light mixing into desired color becomes difficult and light loss occurs
Solution Approach 1:
The patent extracts and eliminates the harmful side emission by introducing wall structures that block light from propagating in unwanted directions. The walls are specifically designed to prevent side emission while maintaining upward light emission, thus removing the energy loss pathway without affecting the primary lighting function
Solution Approach 2:
The patent applies local quality modification by making the LED package structure asymmetric - the upper surface remains open for light emission while the side surfaces are enclosed with walls. This localized structural differentiation allows light to escape upward while blocking lateral propagation, solving both the light mixing difficulty and energy loss problems
2Illumination intensity
If red LED is used directly, then red light emission is achieved, but manufacturing cost increases and yield decreases
Solution Approach 1:
The patent uses a blue LED as a template or copy source to generate red light indirectly. Instead of manufacturing red LEDs directly, a blue LED chip is paired with a red phosphor material that converts the blue light into red light. This copying approach leverages the mature blue LED manufacturing process to achieve red light emission, thereby reducing manufacturing cost and improving yield
Solution Approach 2:
The patent changes the optical parameters of the blue LED light by introducing a red phosphor converter. The phosphor material absorbs blue light and re-emits it at a longer wavelength (red light), effectively transforming the spectral characteristics. This parameter change allows the system to achieve red light emission using blue LED technology, avoiding the manufacturing difficulties of direct red LED production
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 enables efficient mixing of light from each LED package into a desired color, improving color balance and reducing light loss through side emission.
Implementation Method 1
a red wavelength converter 50 is disposed to cover the blue light emitting diode 22a. The red wavelength converter 50 may include one or more types of phosphors therein to convert a wavelength of blue light emitted from the blue light emitting diode 22a so as to emit red light to the outside.
Implementation Method 2
a green wavelength converter 52 is disposed to cover the blue light emitting diode 22a to emit green light. The green wavelength converter 52 may include one or more types of phosphors to convert a wavelength of blue light emitted from the blue light emitting diode 22a so as to emit green light to the outside.
Data Source
AI summary
A light emitting diode device including a substrate, a plurality of terminals disposed on the substrate, and a plurality of light sources disposed on the substrate, electrically connected to the plurality of terminals, and configured to emit light, in which each of the light sources includes a light emitting diode chip, and a wall surrounding side surfaces of the light emitting diode chip, at least one of the light sources includes a wavelength converter disposed on the light emitting diode chip, and at least two light sources share the wall.