Optical Member with Quantum Dot Color Conversion for Display Devices
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining display quality due to light emitting elements that are selectively turned on and off, leading to deterioration in image quality and the occurrence of the 'yellow ring phenomenon.
Innovation Solution
Incorporating an optical member with a color conversion layer containing quantum dots, a filter layer, and an optical path changing layer between the light source member and the liquid crystal display panel, which includes a low refraction layer or pattern layer to optimize light transmission and reflection, thereby improving color reproducibility and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If light emitting elements are selectively turned on and off to control image display, then image information can be provided, but display quality deteriorates and yellow ring phenomenon occurs
Solution Approach 1:
The patent introduces a yellow light emitting element as an intermediary component between the blue light source and the liquid crystal panel. This yellow light emitting element converts excess blue light into yellow light, acting as a mediator that balances the color spectrum. By adding this intermediary element, the system maintains color accuracy when light emitting elements are selectively turned on and off, preventing the yellow ring phenomenon while preserving image information display capabilities.
2Illumination intensity
If various optical members are added to improve light efficiency and color reproducibility, then display quality improves, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated optical member structure. The optical member includes a yellow light emitting element, a wavelength conversion layer, and a reflective layer all positioned in close proximity, forming a unified component assembly. This merging approach achieves improved light efficiency and color reproducibility while minimizing the increase in device complexity by consolidating multiple optical functions into one structured unit.
3Manufacturing precision
If quantum dot color conversion layer is used to improve color fidelity, then color reproducibility improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes in the form of a reflective layer with specific optical properties positioned beneath the quantum dot color conversion layer. By adjusting the reflectivity and optical characteristics of this layer, the system enhances color fidelity and ensures accurate color representation. This parameter optimization allows for improved manufacturing precision in the color conversion process while maintaining ease of manufacture through controlled optical parameter adjustments rather than complex structural modifications.
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 enhances display quality by ensuring accurate color representation and reducing the 'yellow ring' phenomenon, resulting in improved light efficiency and color fidelity.
Implementation Method 1
a color conversion layer disposed on the base substrate and including a quantum dot for converting the first color light into a second color light and a third color light
Implementation Method 2
a filter layer disposed between the base substrate and the color conversion layer and transmitting the first color light and reflecting the second color light and the third color light
Implementation Method 3
an optical path changing layer disposed on at least one of an upper surface and a lower surface of the filter layer
Implementation Method 4
an optical path changing layer disposed on at least one of an upper surface and a lower surface of the filter layer
Data Source
AI summary
A display device including a light source member including a plurality of light emitting units emitting a first color light, an optical member disposed on an upper side of the light source member, and a liquid crystal display panel disposed on an upper side of the optical member. The optical member includes a base substrate, a color conversion layer disposed on the base substrate and including a quantum dot for converting the first color light into a second color light and a third color light, a filter layer disposed between the base substrate and the color conversion layer and transmitting the first color light and reflecting the second color light and the third color light, and an optical path changing layer disposed on at least one of an upper surface and a lower surface of the filter layer.