Quantum Dot Composite Film Edge Region Design
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Solution Overview
Problem
Liquid crystal display devices with quantum dots suffer from blue light leakage at the edges due to sensitivity to water and oxygen, leading to color distortion and reduced display quality, especially in small and medium-sized devices with narrow frames.
Innovation Solution
A liquid crystal display apparatus featuring a composite film layer with an intermediate region doped with quantum dots and an edge region doped with phosphors, along with a color filter substrate having varying thickness regions to absorb and emit white light uniformly, effectively addressing the blue light leakage issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used in the liquid crystal display to improve color gamut and vividness, then the color display performance is significantly improved, but the edge area of the film becomes susceptible to water and oxygen penetration, causing blue light leakage and color distortion
Solution Approach 1:
The film is divided into an intermediate region (with quantum dots for color enhancement) and an edge region (with phosphors for protection), allowing each region to serve its specific function while working together as a unified system
Solution Approach 2:
Different regions of the film are doped with different materials (quantum dots in the intermediate region, phosphors in the edge region) to provide locally optimized properties: color enhancement where needed and protection where vulnerable
2Length of moving object
If the frame width is reduced in small and medium-sized display devices to achieve narrower frames, then the device design is improved, but the blue light leakage problem becomes more prominent due to the narrower protection margin
Solution Approach 1:
The phosphor-doped edge region acts as an intermediary layer between the quantum dot region and the external environment, absorbing excess blue light and preventing it from reaching the display area, thus solving the blue light leakage problem without requiring a wide frame
3Reliability
If quantum dots are encapsulated in a film to protect them, then the quantum dots are protected to some extent, but the edge area of the film remains vulnerable to water and oxygen penetration, causing display failure
Solution Approach 1:
The phosphors are pre-positioned in the edge region to provide protective functionality before any water or oxygen penetration occurs, creating a preventive barrier that absorbs blue light and protects the quantum dot region from environmental damage
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 enhances color gamut and vividness while reducing energy consumption and ensuring consistent color display across different areas, effectively mitigating the blue light leakage problem and protecting the quantum dot region from oxygen and heat.
Implementation Method 1
Quantum dots, QDs, also known as semiconductor nanocrystals. Quantum dots are quasi-zero-dimensional of nano-materials, aggregations of atoms and molecules at the nanometer scale
Implementation Method 2
the intermediate region doped with quantum dot, the edge region doped with phosphors, the composite film layer emit white light after absorbing blue light
Implementation Method 3
the phosphor comprising a red phosphor and a green phosphor, the red phosphor emits red light after absorbing the blue light, the green phosphor emits green light after absorbing the blue light, and the red light and the green light in combination with the blue light to white light
Implementation Method 4
A color filter substrate to receive white light and the color filter substrate comprising a color resist layer
Data Source
AI summary
The present application discloses a liquid crystal display apparatus, includes a backlight source to emit blue light; a composite film layer to receive the blue light and wherein the composite film layer includes an intermediate region, and an edge region, the edge region is disposed around the intermediate region, the intermediate region doped with quantum dot, the edge region doped with phosphors, the composite film layer emit white light after absorbing blue light; and a color filter substrate to receive white light and the color filter substrate includes a color resist layer, wherein the color resist layer includes a first region and a second region, the first region is provided corresponding to the intermediate region, the second region is provided corresponding to the edge region, and the thickness of the first region is smaller than the second thickness of the second region.