Wavelength Conversion Member With Irregular Interface For Front Brightness
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Solution Overview
Problem
Current liquid crystal display devices face limitations in achieving high front brightness due to the inefficiency of light emission from wavelength conversion members containing quantum dots, which affects the brilliance and color reproducibility of the displayed images.
Innovation Solution
A wavelength conversion member is designed with a wavelength conversion layer containing quantum dots and an adjacent layer having an irregular interface shape with concave and convex portions, optimizing the refractive indices and arrangement to enhance light extraction efficiency by reflecting and condensing excitation light, thereby increasing the intensity of red, green, and blue light emitted towards the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wavelength conversion member containing quantum dots is used to improve color reproducibility, then color accuracy is improved, but front brightness is insufficient due to low light emission intensity
Solution Approach 1:
The patent applies curvature by forming convex and concave portions on the interface between the wavelength conversion layer and adjacent layer. This irregular curved interface shape redirects light paths, increases light extraction efficiency, and improves front brightness without sacrificing color reproduction quality.
Solution Approach 2:
The patent changes the geometric parameters of the layer interface by introducing convex and concave portions with specific curvature radii (0.1-10 μm). This parameter modification optimizes light extraction efficiency and increases the intensity of light emitted toward the display surface, directly addressing the front brightness issue.
2Reliability
If quantum dots are used for wavelength conversion, then color reproducibility improves, but light extraction efficiency remains low
Solution Approach 1:
The convex and concave portions on the layer interface create curved surfaces that optimize light extraction. This curvature design increases the proportion of fluorescent light extracted toward the display surface while maintaining the quantum dot's color reproduction capabilities.
Solution Approach 2:
The patent applies local quality by creating specific convex and concave regions at the layer interface rather than uniformly modifying the entire structure. This localized irregularity optimizes light extraction in critical areas while preserving the overall wavelength conversion functionality and color accuracy.
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 significantly improves the front brightness of liquid crystal display devices by increasing the light emission intensity of red, green, and blue light, resulting in a more brilliant and color-accurate image display.
Implementation Method 1
the quantum dot is excited, and thus, fluorescent light having a wavelength different from that of the excitation light is emitted (wavelength conversion)
Implementation Method 2
optimizing the refractive indices and arrangement to enhance light extraction efficiency by reflecting and condensing excitation light
Data Source
AI summary
Provided is a wavelength conversion member, including: a wavelength conversion layer containing a quantum dot which is excited by excitation light and emits fluorescent light; and an adjacent layer directly laminated on the wavelength conversion layer, in which the shape of an interface between the wavelength conversion layer and the adjacent layer includes an irregular shape formed of a concave portion and a convex portion. Provided are a backlight unit, a polarizing plate, a liquid crystal panel, and a liquid crystal display device: including the wavelength conversion member.