Polarized RGB Light Source Using Photonic Crystal Grids
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Solution Overview
Problem
Conventional quantum dot (QD) backlight stacks for liquid crystal displays (LCDs) are costly, thick, and complex due to the inclusion of diffuser, polarizer, and brightness enhancing films, which also reduce light efficiency.
Innovation Solution
A polarized RGB light source is created using photonic crystal grid structures on a substrate with green and red quantum dot layers, combined with a blue light emitting diode array, eliminating the need for polarizer and brightness enhancing films, and coated with a high refractive index film to enhance light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional QD backlight stacks include diffuser, polarizer, and brightness enhancing films, then vivid color is produced, but cost increases, thickness increases, manufacturing complexity increases, and light efficiency decreases
Solution Approach 1:
The patent combines multiple functions into the photonic crystal grid structure itself. The grid structure simultaneously serves as a color generation element (through photonic bandgap effects), a polarizing element (through anisotropic light transmission), and a brightness enhancement element (through light trapping and extraction optimization). This eliminates the need for separate diffuser, polarizer, and brightness enhancing films, thereby reducing manufacturing complexity while maintaining vivid color output.
Solution Approach 2:
The photonic crystal grid structure is designed to perform multiple functions concurrently: it generates specific colors through photonic bandgap effects, polarizes light through its anisotropic structure, and enhances brightness through optimized light extraction. This multi-functional design replaces multiple separate components, simplifying the overall device structure and manufacturing process while achieving the desired optical performance.
2Illumination intensity
If conventional QD backlight stacks include diffuser, polarizer, and brightness enhancing films, then vivid color is produced, but thickness increases
Solution Approach 1:
The patent integrates the functions of multiple thick films (diffuser, polarizer, brightness enhancing films) into a single thin photonic crystal grid structure. This consolidation dramatically reduces the overall backlight thickness while maintaining the optical functions necessary for producing vivid color.
Solution Approach 2:
The photonic crystal grid structure is implemented as a thin film or substrate-integrated structure that provides the optical functions previously requiring multiple thick films. This thin-film approach maintains vivid color output while significantly reducing the backlight stack thickness.
3Illumination intensity
If conventional QD backlight stacks include diffuser, polarizer, and brightness enhancing films, then vivid color is produced, but light efficiency decreases
Solution Approach 1:
The patent combines color generation, polarizing, and brightness enhancement functions into the photonic crystal grid structure, eliminating the need for separate films that would each cause light losses through absorption and scattering. This integrated approach improves light efficiency while maintaining vivid color output.
Solution Approach 2:
The photonic crystal grid structure utilizes a periodic porous or lattice structure that enables controlled light interaction. This structure achieves color generation and polarization through photonic bandgap effects with minimal light absorption, and the open structure allows efficient light extraction, thereby improving overall light efficiency compared to conventional dense films.
4Illumination intensity
If conventional QD backlight stacks include diffuser, polarizer, and brightness enhancing films, then vivid color is produced, but cost increases
Solution Approach 1:
The patent consolidates multiple expensive components (diffuser film, polarizer film, brightness enhancing films) into a single photonic crystal grid structure that can be manufactured using standard semiconductor or display industry processes. This integration reduces material costs and assembly costs while maintaining the optical performance necessary for vivid color display.
Solution Approach 2:
The photonic crystal grid structure utilizes changes in refractive index and periodic structure parameters to achieve color generation and polarization effects that previously required multiple specialized films. This parameter-based approach enables cost-effective manufacturing using existing fabrication techniques while achieving the desired optical performance.
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
This solution reduces the cost and thickness of the backlight stack while maintaining high light efficiency and producing vivid colors, enabling lower power operation and simplified manufacturing.
Implementation Method 1
a plurality of photonic crystal grid structures on a substrate. The plurality of photonic crystal grid structures includes one or more structured regions for the transmission of polarized blue light, one or more structured regions for the transmission of polarized green light, and one or more structured regions for the transmission of polarized red light
Implementation Method 2
A high refractive index film is disposed over the plurality of photonic crystal grid structures on the substrate and the green and red quantum dot layers
Implementation Method 3
A blue light emitting diode array is disposed on the polarized light device such that the emission from the blue light emitting diode array facilitates the emission of red and green light from the red and green quantum dot layers
Data Source
AI summary
A device for producing polarized light includes a plurality of photonic crystal grid structures on a substrate. The plurality of photonic crystal grid structures includes one or more structured regions for the transmission of polarized blue light, polarized green light, and polarized red light. A green quantum dot layer is substantially positioned on the one or more structured regions for the transmission of polarized green light and a red quantum dot layer is substantially positioned on the one or more structured regions for the transmission of polarized red light. A blue light emitting diode array is disposed on the polarized light device such that the emission from the blue light emitting diode array facilitates the emission of red and green light from the red and green quantum dot layers.