Boundary Fluorescent Body for LCD Light Leakage Control
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Solution Overview
Problem
Liquid crystal display devices experience a light leakage phenomenon due to the exposure of quantum dots at the edge of the fluorescent film, leading to performance degradation and reduced light conversion efficiency, which cannot be effectively addressed by increasing the bezel size without compromising the display area.
Innovation Solution
A boundary fluorescent body is introduced in a quadrangle frame shape to match the outer edge of the fluorescent film, comprising quantum dots that convert incident light into white light, ensuring uniform illumination across the display device and reducing light leakage by mixing with light projected through the edge region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the bezel is increased in size to prevent light leakage, then light leakage is reduced, but the display area is decreased
Solution Approach 1:
The patent applies local quality by introducing a boundary fluorescent body specifically at the edge region of the fluorescent film, where light leakage occurs. This boundary fluorescent body has different properties (contains quantum dots for wavelength conversion) compared to the main fluorescent film, creating a localized solution that addresses the light leakage problem only where needed, without affecting the entire display area or requiring bezel enlargement.
2Area of stationary object
If the fluorescent film is cut to match the liquid crystal display panel size, then the display area is maximized, but quantum dots are lost and light conversion efficiency decreases
Solution Approach 1:
The patent segments the fluorescent light conversion system into two distinct parts: the main fluorescent film that covers the central display area, and a separate boundary fluorescent body that lines the edge region. This segmentation allows the fluorescent film to be cut precisely to the display panel size without losing quantum dots, while the boundary fluorescent body compensates for edge effects and maintains light conversion efficiency at the boundaries.
Solution Approach 2:
The boundary fluorescent body is prepared in advance and positioned at the edge region before the fluorescent film is installed. This preliminary action ensures that quantum dots are not lost during the cutting process, as the boundary fluorescent body is separately manufactured and then integrated into the final assembly, preserving light conversion efficiency from the outset.
3Power
If quantum dots are exposed at the edge of the fluorescent film, then light conversion is improved, but moisture and oxygen permeate causing property loss
Solution Approach 1:
The patent employs a barrier film structure that encapsulates the quantum dots in the boundary fluorescent body, protecting them from moisture and oxygen permeation. This thin film barrier prevents environmental degradation while allowing the quantum dots to maintain their light conversion properties at the edge region where they are most needed for preventing light leakage.
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 boundary fluorescent body enhances light color mixing efficiency at the edge region, minimizing light leakage without increasing the bezel size, thereby maintaining display area and improving overall light emission uniformity.
Implementation Method 1
The fluorescent film includes quantum dots that convert at least some of the light from the backlight unit passing through the film into other wavelengths of light so that together the light exiting the fluorescent film is white light
Implementation Method 2
Like the fluorescent film the boundary fluorescent body also includes quantum dots to convert incident light into another wavelength of light such that the resulting white light is more uniform across the entire extent of the display device
Data Source
AI summary
A liquid crystal display device including a backlight unit and a fluorescent film, and a boundary fluorescent body is described.