Color Conversion Panel With Quantum Dots And Organic Dyes
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Solution Overview
Problem
Conventional color conversion panels for OLED display devices face challenges in achieving efficient color conversion and manufacturing cost reduction due to complex layer structures and multiple masking processes.
Innovation Solution
A color conversion panel with a color base substrate, light blocking pattern, and multiple transmissive areas, featuring a first and second color filter with corresponding color conversion layers, a transmissive layer, and a yellow light absorbing layer, which allows for uniform transmittance and reduced manufacturing complexity by using overlapping layers and shared masking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional color filter is used in OLED display devices, then color display is achieved, but manufacturing cost is high and pixel accuracy is limited
Solution Approach 1:
The patent changes the material parameters of the color filter layer by incorporating quantum dots with specific size ranges (2-50 nm) that emit specific wavelengths (red: 620-750 nm, green: 495-570 nm). This parameter change enables precise color control and improved pixel accuracy while maintaining manufacturing feasibility through solution processing methods.
Solution Approach 2:
The patent creates a composite color filter structure combining organic dyes (yellow dye, gray dye) with inorganic quantum dots. This composite approach leverages the advantages of both materials: quantum dots provide narrow emission bandwidth for high color purity and accuracy, while organic dyes offer ease of processing and cost-effectiveness, thereby improving pixel accuracy without excessively increasing manufacturing complexity.
2Manufacturing precision
If multiple color filters and conversion layers are used to improve color conversion efficiency, then color accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the functions of multiple color filters and conversion layers into a single integrated color filter layer containing quantum dots and organic dyes. This consolidation achieves high color conversion efficiency by utilizing the narrow emission bandwidth of quantum dots combined with the optical absorption properties of organic dyes, while simultaneously reducing structural complexity by eliminating the need for separate conversion layers and multiple color filter stacks.
Solution Approach 2:
The color filter layer is designed to perform multiple functions simultaneously: wavelength conversion via quantum dots, optical filtering via organic dyes, and color purification through the combination of both mechanisms. The light blocking pattern also serves dual purposes of defining pixel boundaries and enhancing color contrast, thereby achieving high color conversion efficiency without proportionally increasing structural complexity.
3Measurement precision
If quantum dots are used for wavelength conversion, then color purity is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent controls the size parameter of quantum dots (2-50 nm) to precisely tune emission wavelengths and achieve high color purity. By establishing specific size ranges for different color emissions (red: 620-750 nm, green: 495-570 nm), the patent enables precise color control while using standard solution processing techniques that maintain manufacturing simplicity and scalability.
Solution Approach 2:
The patent applies different quantum dot size distributions in different regions of the color filter layer to achieve specific color purities for different color channels. Red quantum dots (larger size: 20-50 nm), green quantum dots (smaller size: 2-20 nm), and yellow quantum dots (intermediate size: 10-30 nm) are selectively positioned to provide optimized color purity for each transmissive area, while the overall manufacturing process remains simplified through solution processing.
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 enables efficient color conversion with reduced manufacturing costs by simplifying the layer structure and masking processes, improving transmittance uniformity across different areas, and enhancing light management through the use of quantum dots and scattering elements.
Implementation Method 1
a first color conversion layer on the first color filter at the first transmissive area; a second color conversion layer on the first color filter at the second transmissive area... The first color conversion layer may include red quantum dots or red quantum rods, and the second color conversion layer may include green quantum dots or green quantum rods
Implementation Method 2
a yellow light absorbing layer on a surface of the color base substrate... The first color filter may include a yellow light absorbing material
Data Source
AI summary
A color conversion panel includes a color base substrate including a first transmissive area, a second transmissive area and a third transmissive area; a light blocking pattern on the color base substrate and defining the first transmissive area, the second transmissive area, and the third transmissive area; a first color filter in the first transmissive area and the second transmissive area; a first color conversion layer on the first color filter at the first transmissive area; a second color conversion layer on the first color filter in the second transmissive area; and a second color filter on the first transmissive area, the second transmissive area, and the third transmissive area. The first color conversion layer and the second color conversion layer are each between the first color filter and the second color filter.