Quantum Dot Color Filter with Liquid-Repellent Coating for Display Devices
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Solution Overview
Problem
Liquid crystal display devices face issues with light loss and color reproducibility due to the use of color filters, and the manufacturing process of photo-luminescent LCDs can result in overflow and not-fill phenomena during quantum dot application, leading to optical characteristic deterioration.
Innovation Solution
A display device with a color filter member featuring a partition member, liquid-repellent coating layer, and color conversion patterns made of quantum dots or fluorescent substances, which include bent parts and conversion parts that contact each other to form interfaces, reducing light loss and improving color reproducibility, and a method of manufacturing that involves forming these patterns to prevent overflow and not-fill issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is used in liquid crystal display devices, then color formation is achieved, but light loss occurs and color reproducibility deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of color formation from absorption-based color filters to emission-based quantum dot conversion. This parameter change enables high light transmission while achieving accurate color reproduction through photoluminescent conversion, resolving the contradiction between light transmission and color reproducibility.
Solution Approach 2:
The patent replaces the traditional color filter mechanism (absorption) with a photoluminescent conversion mechanism. This substitution allows the system to achieve color formation through light emission rather than light absorption, thereby improving both light transmission and color reproducibility simultaneously.
2Reliability
If quantum dots are applied through ink-jet process, then color conversion is achieved, but overflow phenomenon occurs causing color mixing
Solution Approach 1:
The patent introduces a liquid-repellent coating layer as an intermediary between the substrate and quantum dot solution. This intermediary creates a hydrophobic barrier that confines the liquid quantum dot solution within the pixel region, preventing overflow and maintaining sharp pattern definition while enabling accurate color conversion.
Solution Approach 2:
The patent applies the liquid-repellent coating layer before applying the quantum dot solution, creating a preliminary protective barrier that prevents the harmful overflow effect. This preliminary anti-action ensures that the quantum dots remain confined to their designated regions, maintaining manufacturing precision and color accuracy.
3Manufacturing precision
If small amount of quantum dots is applied, then overflow is prevented, but not-fill phenomenon occurs deteriorating optical characteristics
Solution Approach 1:
The liquid-repellent coating layer acts as a mediator that enables the use of smaller quantum dot amounts while preventing not-fill phenomenon. The coating creates a controlled interface that guides the quantum dot solution to spread uniformly and fill the pixel region completely, ensuring optimal optical characteristics without overflow.
4Ease of manufacture
If conventional color filter manufacturing process is used, then manufacturing is simple, but defective ratio increases during quantum dot application
Solution Approach 1:
The patent performs a preliminary action by applying the liquid-repellent coating layer before the quantum dot application process. This preliminary step creates a controlled environment that prevents both overflow and not-fill phenomena, significantly reducing the defective ratio while maintaining ease of manufacture through a straightforward sequential process.
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 reproducibility and reduces manufacturing defects, improving the optical characteristics and efficiency of the display device while minimizing processing time and costs.
Implementation Method 1
a color conversion member including a first color conversion pattern and a second conversion pattern, which are disposed in each of the opening parts and provide different light
Implementation Method 2
at least one of a plurality of quantum dots and a plurality of fluorescent substances corresponding to the different light
Implementation Method 3
a liquid-repellent coating layer configured to cover the partition member
Data Source
AI summary
A display device includes a display panel including a plurality of pixels; and a color filter member on the display panel. The color filter member includes a partition member where a plurality of opening parts each overlapping with at least one of the plurality of pixels on a plane is defined, a liquid-repellent coating layer covering the partition member, and a color conversion member including a first color conversion pattern and a second conversion pattern, which are in each of the opening parts and provide different light. The first color conversion pattern includes a first bent part and a first color conversion part, which include the same material and contact each other to form an interface. The second color conversion pattern includes a second bent part and a second color conversion part, which include the same material and contact each other to form an interface.