Quantum Dot Patterning for High-Resolution Display Color Purity
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Solution Overview
Problem
The challenge of color mixing during the patterning process of quantum dot material films in display devices affects the display effect, hindering high-resolution performance.
Innovation Solution
A method involving the formation of quantum dot patterns with cross-linkable ligands, followed by local cross-linking and fluorescence quenching processes, including ion exchange using metal cations, to create stacked quantum dot patterns with cross-linked structures and quenched fluorescence properties, thereby preventing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dot material film is patterned to achieve high resolution, then display device resolution is improved, but color mixing problem occurs affecting display effect
Solution Approach 1:
The patent applies preliminary action by performing cross-linking treatment on quantum dot ligands before the harmful color mixing occurs. The cross-linking is performed during the patterning process itself, creating a stable cross-linked structure that prevents subsequent color mixing between adjacent quantum dot patterns, thus resolving the contradiction between achieving high resolution and preventing color mixing.
Solution Approach 2:
The patent changes the chemical parameter of the quantum dot ligands by introducing cross-linkable functional groups and performing cross-linking treatment. This parameter change transforms the ligand structure from non-cross-linked to cross-linked, which stabilizes the quantum dot patterns and prevents color mixing while maintaining high resolution patterning.
2Manufacturing precision
If multiple quantum dot pattern elements are sequentially formed, then color purity is improved, but process complexity increases
Solution Approach 1:
The patent applies universality by using a single cross-linking treatment step that serves multiple functions: it stabilizes quantum dot patterns of different colors, prevents color mixing, and maintains pattern integrity throughout the sequential patterning process. This multi-functional approach simplifies the overall process while maintaining color purity.
Solution Approach 2:
The patent changes the chemical state of ligands through cross-linking, creating a stable cross-linked structure that remains effective throughout the sequential patterning of multiple quantum dot colors. This parameter change enables the system to handle multiple pattern elements without increasing complexity, as the cross-linked ligands provide consistent stabilization across all coloring steps.
3Stability of the object's composition
If cross-linking is performed on quantum dot film, then pattern stability is improved, but fluorescence quenching occurs in uncross-linked regions
Solution Approach 1:
The patent applies local quality by performing localized cross-linking treatment only in regions where quantum dot patterns are formed and where color mixing prevention is needed. The cross-linking is spatially controlled to affect only the necessary areas, maintaining pattern stability while minimizing fluorescence quenching to essential regions only.
Solution Approach 2:
The patent changes the cross-linking degree parameter of ligands based on spatial location and process stage. By controlling the extent and location of cross-linking, the patent achieves adequate pattern stability in colored regions while preserving fluorescence properties in regions where quenching is not required, thus balancing stability and fluorescence maintenance.
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 approach effectively eliminates color mixing and enhances the display color gamut, improving the resolution and display quality of quantum dot display devices.
Implementation Method 1
the cross-linkable ligands are photo cross-linkable ligands, and the performing of the local cross-linking process on the quantum dot film includes: disposing a mask plate on one side of the quantum dot film far away from the base substrate, wherein the mask plate comprises a light-transmitting portion and a light-shielding portion, and the mask plate directly faces the pixel accommodating holes corresponding to the corresponding color; and exposing the pixel accommodating holes corresponding to the corresponding color by using the mask plate so as to enable the cross-linkable ligands positioned in the pixel accommodating holes corresponding to the corresponding color on the quantum dot film to be cross-linked.
Implementation Method 2
performing, by using a processing solution with metal cations, an ion exchange process on the quantum dot body in the quantum dot which is positioned on the surface of the first quantum dot pattern and is not subjected to the cross-linking process.
Data Source
AI summary
A method for manufacturing display panel including: forming pixel defining layer on one side of base substrate; forming quantum dot layer, including sequentially forming first quantum dot pattern of at least two quantum dot patterns, forming first quantum dot pattern of one quantum dot pattern including forming quantum dot film capable of emitting light with corresponding colors, quantum dot film including quantum dot body and cross-linkable ligand; performing local cross-linking process on quantum dot film; performing developing process on quantum dot film subjected to local crosslinking process to form first quantum dot pattern in pixel accommodating hole corresponding to corresponding color; after forming first quantum dot pattern of quantum dot patterns, the method includes performing fluorescence property quenching process to quench fluorescence of quantum dot body in quantum dot on surface of first quantum dot pattern and not subjected to crosslinking process. Also provided is display panel and display device.