LED Grating Layer Polarization Selectivity
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Solution Overview
Problem
Polarization LEDs grown on non-polar or semi-polar surface GaN films suffer from poor luminous efficiency, leading to high power consumption in electric equipment.
Innovation Solution
A light-emitting diode (LED) structure incorporating a grating layer and a light reflecting layer, where the grating layer transmits linearly polarized light perpendicular to its direction and reflects linearly polarized light parallel to its direction, optionally with a depolarization layer and quantum dot layer to enhance luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If non-polar or semi-polar surface GaN film growth is used to create polarization LED, then the LED can emit polarized light, but the luminous efficiency becomes poor
Solution Approach 1:
A grating layer is introduced as an intermediary component between the light-emitting component and the external environment. This grating layer selectively transmits linearly polarized light perpendicular to its grating direction while reflecting linearly polarized light parallel to the grating direction, thereby enhancing the luminous efficiency of polarized light emission without requiring changes to the underlying GaN film growth process
Solution Approach 2:
The patent changes the optical parameters of the LED system by introducing a grating layer with specific grating directions and periods. This modifies the polarization state and transmission characteristics of the emitted light, improving luminous efficiency by directing polarized light more effectively while maintaining the same light-emitting component
2Volume of moving object
If polarization LED is used as LC backlight source, then the volume of LCD device is reduced, but the luminous efficiency remains poor
Solution Approach 1:
The grating layer serves as an optical intermediary that enhances the polarization selectivity of the LED backlight source. By transmitting only linearly polarized light perpendicular to the grating direction, it improves the luminous efficiency of the compact polarization LED structure, making it more suitable for LCD backlight applications without increasing device volume
3Illumination intensity
If grating layer is added to improve polarized light transmission, then luminous efficiency improves, but device structure becomes more complex
Solution Approach 1:
The grating layer is implemented as a thin film structure that can be integrated into the existing LED device architecture. This thin film approach minimizes the increase in device complexity while effectively improving polarized light transmission and luminous efficiency
Solution Approach 2:
The grating layer is designed to perform multiple functions: it acts as a polarization filter, a light extraction enhancement structure, and an optical guide. By combining multiple functions in a single component, the overall device complexity is minimized while achieving improved luminous 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 structure improves the luminous efficiency of polarized light emission, reducing power consumption and enhancing the performance of LEDs, backlight modules, and liquid crystal display devices.
Implementation Method 1
the grating layer is configured to let linearly polarized light perpendicular to a grating direction of the grating layer in light emitted from the light-emitting component to transmit through the grating layer, and reflect linearly polarized light parallel to the grating direction of the grating layer
Implementation Method 2
a grating layer; wherein a light-emitting component is disposed between the grating layer and the light reflecting layer
Implementation Method 3
a light reflecting layer; wherein a light-emitting component is disposed between the grating layer and the light reflecting layer
Implementation Method 4
the depolarization layer includes a quantum dot layer provided with quantum dots which emit excitation light when excited by the light emitted from the light-emitting component
Data Source
AI summary
The present disclosure relates to a light-emitting diode (LED), including: a grating layer; and a light reflecting layer, wherein a light-emitting component is disposed between the grating layer and the light reflecting layer; and wherein the grating layer is configured to let linearly polarized light perpendicular to a grating direction of the grating layer in light emitted from the light-emitting component transmit through the grating layer, and reflect linearly polarized light parallel to the grating direction of the grating layer in the light emitted from the light-emitting component.