Quantum Dot Color Filter Alignment for Display Light Efficiency
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Solution Overview
Problem
Conventional display apparatuses face misalignment issues during the bonding process of light-emitting units and color conversion units, leading to reduced light efficiency.
Innovation Solution
A display apparatus is designed with a structure that includes a substrate with a transistor, a color filter layer, a quantum dot layer, and a light-transmitting layer, where the quantum dot layers overlap the color filter layers, and the light-transmitting layer overlaps the color filter layers, with a light-emitting device positioned on the quantum dot layers, and a method of manufacturing this apparatus that involves forming these layers sequentially to prevent misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light-emitting unit and a color conversion unit are bonded separately, then the manufacturing process can be simplified, but misalignment occurs reducing light efficiency
Solution Approach 1:
The patent merges the color filter layer and quantum dot layer into a single integrated structure formed on the same substrate as the light-emitting unit. This eliminates the need for separate bonding of color conversion units, thereby preventing misalignment while maintaining manufacturing simplicity. The color filter and quantum dots are deposited sequentially in the same fabrication process, ensuring precise spatial registration.
Solution Approach 2:
The color filter layer is formed preliminarily on the substrate before the quantum dot layer is deposited. This preliminary formation establishes a fixed reference structure that guides subsequent quantum dot placement, ensuring precise alignment without requiring post-fabrication bonding operations.
2Manufacturing precision
If the quantum dot layer is formed after the color filter layer, then alignment is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The fabrication process is segmented into distinct sequential steps: first forming the color filter layer, then forming the quantum dot layer. This segmentation allows each layer to be optimized independently while maintaining precise alignment through the sequential deposition approach on the same substrate.
3Adaptability or versatility
If the color filter layer and quantum dot layer are formed on separate substrates, then each layer can be optimized independently, but misalignment occurs during bonding
Solution Approach 1:
The patent combines the formation of both color filter layer and quantum dot layer on a single substrate, eliminating the bonding step between separate substrates. This merging approach maintains the ability to independently optimize each layer's material composition and structure while ensuring precise alignment through co-deposition on the same substrate.
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 enhances light efficiency and prevents misalignment, resulting in improved performance and resolution of the display apparatus.
Implementation Method 1
the light generated by a light-emitting unit of some pixels may be converted into light of a different color while passing through the color conversion unit to be extracted to the outside
Data Source
AI summary
A display apparatus includes: an overcoat layer; a first color filter layer, a second color filter layer, and a third color filter layer arranged on the overcoat layer; a first planarization layer arranged on the first color filter layer, the second color filter layer, and the third color filter layer; a second planarization layer arranged on the first planarization layer and defining a first through-hole, a second through-hole, and a third through-hole therein; a first quantum dot layer in the first through-hole; and a second quantum dot layer in the second through-hole.