Optical Filter Light Blocking Layer Design
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving high display quality with reduced defect rates and improved light emission efficiency, particularly in effectively converting and transmitting light across different color areas.
Innovation Solution
An optical filter design featuring a substrate with multiple color areas and a surrounding light blocking layer, including first and second color filters, a light transmission portion, and a light blocking layer with scattering particles and quantum dots, which converts incident light into different colors while minimizing light leakage and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional color filter structure is used, then the manufacturing process is simple, but the light emission efficiency is insufficient and display quality is poor
Solution Approach 1:
The optical filter is divided into multiple color areas (first, second, and third color areas) with distinct color filters and color conversion portions. Each color area independently processes light to achieve full-color display while maintaining high light emission efficiency. This segmentation allows optimized light conversion in each region without compromising overall structural manageability.
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing color conversion portions (quantum dots) above corresponding color filters in multiple layers. This three-dimensional arrangement enables enhanced light conversion efficiency while maintaining a compact footprint, resolving the contradiction between improved performance and structural complexity.
2Area of stationary object
If color areas are placed adjacent to each other, then the display coverage is improved, but light leakage between color areas occurs
Solution Approach 1:
A light blocking layer is extracted and positioned between adjacent color areas to selectively remove and block stray light that would otherwise leak into neighboring color regions. This extracted light-blocking element maintains full color area coverage while eliminating the harmful light leakage effect.
Solution Approach 2:
The light blocking layer acts as an intermediary element between adjacent color areas, mediating the interaction between them by absorbing or blocking stray light. This intermediary structure enables close placement of color areas for maximum coverage while preventing harmful light interference between them.
3Manufacturing precision
If quantum dots are used for color conversion, then the color accuracy and light emission efficiency are improved, but the manufacturing precision requirements increase
Solution Approach 1:
Quantum dots are selectively placed only in specific regions where color conversion is needed, with different sizes and compositions tailored to each color area's requirements. This localized approach optimizes color conversion accuracy in each region while simplifying the overall manufacturing process by avoiding uniform complex treatment across the entire structure.
Solution Approach 2:
The patent employs preliminary patterning of the substrate and color filters before quantum dot deposition, establishing precise alignment markers and positioning structures in advance. This preliminary action ensures that quantum dots are accurately placed in the correct locations during subsequent manufacturing steps, reducing the actual placement difficulty.
4Reliability
If a light blocking layer is added to prevent light leakage, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The light blocking layer is merged with the surrounding area structure and integrated into the existing optical stack, sharing common fabrication processes and alignment references with adjacent components. This merging approach improves light control reliability while minimizing the increase in overall device complexity by reusing existing structural elements.
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 optical filter enhances display quality by improving light emission efficiency and reducing defects, ensuring effective light conversion and transmission across color areas, thereby improving the overall performance of the display apparatus.
Implementation Method 1
the first color conversion portion may further include a first quantum dot and the second color conversion portion may further include a second quantum dot, and the first quantum dot and the second quantum dot may include a same material and have different sizes from each other
Implementation Method 2
the light blocking layer includes a body portion in the surrounding area and including a light blocking material
Implementation Method 3
the first color conversion portion, the second color conversion portion, and the light transmission portion may each include scattering particles
Data Source
AI summary
An optical filter including a plurality of color areas and a surrounding area includes a substrate, a first optical layer on the substrate and including a first to third color filter respectively in a first to third color area, a second optical layer including a first color conversion portion, a second color conversion portion and a light transmission portion respectively overlapping the first color filter, the second color filter and the third color filter, and a light blocking layer, where the light blocking layer includes a body portion in the surrounding area including a light blocking material, and the body portion surrounds both a first and a second opening. The first and second color area are adjacent to each other and an area between the first and the second color area correspond to the first opening, and the third color area corresponds to the second opening.