Polarizing Waveguide Recycles S-Polarized Light in LED Devices
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Solution Overview
Problem
Conventional polarized light emitting diode (LED) devices suffer from energy inefficiency due to the absorption of S-polarized light components during the polarization process, leading to reduced luminous output and brightness, as existing methods either install reflective polarizers on LED chips or configure absorptive polarizers in LED packages, resulting in over 50% energy waste.
Innovation Solution
A polarized light emitting diode device utilizing a polarizing waveguide configured with a polarization layer, reflection layer, and conversion layer to guide and convert the emitted beam, recycling the reflected beam for polarization, thereby achieving a polarization ratio of 75% and enhancing energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If absorptive polarizers are used in LED packages, then polarization is achieved, but energy efficiency deteriorates due to over 50% energy waste
Solution Approach 1:
The patent converts the harmful S-polarized light that would normally be absorbed and wasted into a beneficial resource by using a reflective polarizer to redirect it back through a quarter-wave plate, transforming it into P-polarized light that can pass through the polarizer and contribute to the output, thereby converting energy waste into useful light output
Solution Approach 2:
The patent changes the polarization state parameter of light by using a quarter-wave plate to convert S-polarized light into P-polarized light, enabling the recycled light to pass through the reflective polarizer and increase overall energy efficiency
2Use of energy by moving object
If reflective polarizers are installed on LED chips, then energy efficiency is improved by recycling S-polarized light, but luminous output and brightness deteriorate due to absorption during the conversion process
Solution Approach 1:
The patent introduces a quarter-wave plate as an intermediary optical element between the reflective polarizer and the LED chip that enables the conversion of S-polarized light to P-polarized light without significant absorption losses, allowing the recycled light to contribute to luminous output while maintaining energy efficiency
3Illumination intensity
If conventional polarizers are used in illuminations, then polarization is achieved, but optical efficiency deteriorates due to waste of more than 50% energy
Solution Approach 1:
The patent converts the harmful S-polarized light that would normally be absorbed and wasted into a beneficial resource by using a reflective polarizer to redirect it back through a quarter-wave plate, transforming it into P-polarized light that can pass through the polarizer and contribute to the output, thereby converting energy waste into useful light output
Solution Approach 2:
The patent establishes a continuous light recycling loop where S-polarized light is reflected back, converted to P-polarized light, and then transmitted through the polarizer to the output, ensuring that the useful action of light transmission continues without interruption and maximizing optical efficiency
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 effectively recycles S-polarized light into P-polarized light, maximizing energy efficiency and brightness by ensuring that 50% of the emitted light is recycled and reused, reducing energy waste and improving overall performance.
Implementation Method 1
a polarization layer, configured with a first side and a second side, for reflecting a first polarized component of the beam and transmitting a second polarized component of the beam
Implementation Method 2
a reflection layer, configured with a first side and a second side, for reflecting the first polarized component of the beam
Implementation Method 3
a conversion layer, configured on the second light emitting surface, for converting the first polarized component of the beam into the second polarized component
Data Source
AI summary
The present invention relates to a polarized light emitting diode (LED) device and the method for manufacturing the same, in which the LED device comprises: a base, a light emitting diode (LED) chip, a polarizing waveguide and a packaging material. In an exemplary embodiment, the LED chip is disposed on the base and is configured with a first light-emitting surface for outputting light therefrom; and the waveguide, being comprised of a polarization layer, a reflection layer, a conversion layer and a light transmitting layer, is disposed at the optical path of the light emitted from the LED chip; and the packaging material is used for packaging the waveguide, the LED chip and the base into a package.