Backlight module and display device
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Solution Overview
Problem
Current liquid crystal display products have a limited gamut due to the constraints of quantum dot component materials, which restrict the narrowing of the full width at half maximum of light, preventing an increase in the color performance of LCDs.
Innovation Solution
A backlight module comprising a light source component, a quantum dot component, and a wavelength-band-light-reflecting component with a multi-layer structure that includes a substrate, reflective layers with different refractive indices, and a passivation layer to reflect light in specific band ranges, reducing the full width at half maximum of light and enhancing color display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dot component materials are used to improve gamut, then color performance is enhanced, but the full width at half maximum of light cannot be narrowed sufficiently due to material limitations
Solution Approach 1:
The reflective layer is divided into multiple sub-reflective layers, each with different refractive indices, to selectively reflect different wavelength bands. This segmentation allows precise control over the spectral composition of emitted light, narrowing the full width at half maximum while maintaining high gamut.
Solution Approach 2:
The patent uses composite material structures including quantum dot components combined with multi-layer reflective layers of different materials. This composite approach enables both the color conversion function of quantum dots and the spectral filtering function of the reflective layers to work together, achieving narrow bandwidth and high gamut simultaneously.
2Adaptability or versatility
If blue light emitting diodes and quantum dot component films are used, then gamut is improved, but the full width at half maximum remains too wide
Solution Approach 1:
The wavelength-band-light-reflecting component acts as an intermediary between the blue LED light source and the quantum dot component. It selectively reflects specific wavelength bands to excite the quantum dots, enabling precise control over the emitted spectrum and achieving narrow full width at half maximum while maintaining high gamut.
Solution Approach 2:
The patent changes the optical parameters of the system by using multiple reflective layers with different refractive indices and thicknesses. By adjusting these parameters, the spectral reflection characteristics are optimized to produce narrow bandwidth light output while preserving the broad color gamut.
3Device complexity
If a simple reflective layer is used, then device complexity is low, but light reflection in specific wavelength bands is insufficient
Solution Approach 1:
The reflective component is segmented into multiple sub-reflective layers, each responsible for reflecting a specific wavelength band. This segmentation provides precise wavelength control while maintaining a relatively simple overall structure that can be integrated into the backlight module.
Solution Approach 2:
Each sub-reflective layer is designed with specific local properties (refractive index, thickness) optimized for its designated wavelength band. This local quality approach enables precise spectral control without requiring complex overall structure, as each layer independently performs its specific function.
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 reduces the full width at half maximum of monochromatic light, resulting in a higher gamut and purer colors, allowing for a broader range of color display in liquid crystal display products.
Implementation Method 1
a reflective layer, the reflective layer arranged above the substrate layer and the substrate layer supporting the reflective layer, the reflective layer reflecting light in a specific band range
Data Source
AI summary
The present application provides a backlight module and a display device, including a light source component, a quantum dot component, and a wavelength-band-light-reflecting component being arranged in a stack. The wavelength-band-light-reflecting component reflects light emitted by the quantum dot component in a specific band range, so as to reduce full width at half maximum of the light. The present application reduces the full width at half maximum of monochromatic light by arranging the wavelength-band-light-reflecting component reflecting light in the specific band range, thereby increasing gamut of a display module.