Photonic Crystal Backlight Module for Collimated Light Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Backlight modules suffer from poor light collimation, which affects the efficiency and quality of display devices like LCDs, as the light emitted is not effectively directed, leading to suboptimal performance.
Innovation Solution
A backlight module is designed with a substrate featuring light emitting areas that incorporate a photonic crystal structure with a cavity and defect channels, where the frequency of emergent light is within the photonic forbidden band, allowing light to exit only through the defect channels, ensuring collimated light emission by aligning the defect channels' extension directions parallel to each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional backlight modules are used, then the structure is simple and easy to manufacture, but the light collimation is poor and display quality is suboptimal
Solution Approach 1:
The backlight module is divided into multiple light emitting areas, each with its own photonic crystal structure and defect channels. This segmentation allows independent optimization of light collimation for each area while maintaining overall system simplicity and manufacturability.
Solution Approach 2:
A photonic crystal structure with defect channels is introduced as an intermediary component between the light source and the display panel. This intermediary structure enables effective light collimation and direction control without requiring complex optical systems, thereby improving light collimation while keeping the overall device complexity manageable.
2Productivity
If light is emitted without collimation, then the manufacturing process is simple, but the light extraction efficiency is poor and display performance is suboptimal
Solution Approach 1:
The photonic crystal structure incorporates defect channels with specific local properties (parallel extension directions) that are optimized for light extraction. This local quality enhancement at critical interfaces improves light extraction efficiency without requiring complex manufacturing processes across the entire device.
Solution Approach 2:
The patent utilizes photonic forbidden band parameters to control light emission characteristics. By designing the photonic crystal structure with specific periodicities and defect channel configurations, the light extraction efficiency is enhanced through parameter optimization rather than complex structural changes.
3Illumination intensity
If color filters are used in display panels, then color gamut can be achieved, but the manufacturing process becomes complex and costs increase
Solution Approach 1:
The color filtering function is extracted from the display panel and integrated into the backlight module through the photonic crystal structure. The defect channels and photonic forbidden bands inherently provide wavelength-selective light emission, eliminating or reducing the need for separate color filter layers and simplifying the overall manufacturing process while maintaining color gamut.
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 configuration enhances light collimation, improves light extraction efficiency, and allows for the potential reduction or elimination of color filters in display panels, thereby simplifying manufacturing and reducing costs while maintaining high color gamut and display quality.
Implementation Method 1
a frequency of emergent light of each of the light sources is within a photonic forbidden band of a corresponding photonic crystal structure
Implementation Method 2
extension directions of each of the defect channels are parallel to each other... ensures collimated light emission by aligning the defect channels' extension directions parallel to each other
Data Source
AI summary
The embodiments of the present disclosure disclose a backlight module, a method for manufacturing the same and a display device. The backlight module comprises: a substrate and a plurality of light emitting areas provided on the substrate. The light emitting area comprises a light source and a photonic crystal structure corresponding to the light source; the photonic crystal structure is internally provided with a cavity for accommodating the corresponding light source, and at least one defect channel for connecting the cavity and a surface, on a side of the photonic crystal structure away from the substrate, of the photonic crystal structure; a frequency of emergent light of each of the light sources is within a photonic forbidden band of the corresponding photonic crystal structure; extension directions of each of the defect channels are parallel to each other. The backlight module enables the light emergent to be collimated light.