Quantum Dot Color Filter Manufacturing via Hydrophobic Photoresist Patterning
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Solution Overview
Problem
Conventional methods for manufacturing quantum dot color filters are complex, requiring multiple photolithographic operations and involving difficulties in developing quantum dot photoresists, which complicates the process and increases costs, while also facing challenges in achieving high resolution and stability in pattern formation.
Innovation Solution
A method that simplifies the process by using a transparent organic photoresist layer to pattern blue sub-pixel zones, followed by hydrophobicity treatment and sequential coating of green and red quantum dot curable pastes and photoresists, reducing the need for multiple photolithographic steps and allowing only one type of quantum dot photoresist to be developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to form quantum dot patterns by mixing quantum dots with quantum dot photoresists and performing multiple photolithographic operations, then the quantum dot patterns can be formed, but the process becomes complicated and requires three photolithographic operations
Solution Approach 1:
The patent separates the quantum dot deposition process from the photolithographic patterning process. Instead of mixing quantum dots with photoresist, the patent first forms a patterned photoresist layer, then deposits quantum dots in subsequent steps. This segmentation allows each process to be optimized independently and reduces the number of photolithographic operations required.
Solution Approach 2:
The patent performs preliminary patterning of the photoresist layer before depositing quantum dots. By first creating the patterned photoresist structure and then using it as a template for quantum dot deposition, the patent eliminates the need for multiple photolithographic operations that would otherwise be required to pattern different colored quantum dots.
2Adaptability or versatility
If multiple types of quantum dot photoresists are developed simultaneously, then the quantum dot patterns can be formed with different colors, but the development of quantum dot photoresists becomes difficult
Solution Approach 1:
The patent uses a single type of photoresist material that serves multiple functions in the patterning process. The patterned photoresist layer acts as a mask for subsequent quantum dot deposition steps, eliminating the need to develop multiple specialized photoresists for different colored quantum dots. This universal approach simplifies the manufacturing process while maintaining color versatility.
Solution Approach 2:
The patent introduces a patterned photoresist layer as an intermediary element that mediates between the photolithographic patterning and quantum dot deposition processes. This intermediary structure allows different colored quantum dots to be deposited in a sequential manner without requiring multiple photolithographic operations, thereby simplifying the overall manufacturing process.
3Ease of manufacture
If transfer-printing is used to form quantum dot patterns, then the quantum dots can be transferred to the substrate, but the resolution is poor and edges are serrated
Solution Approach 1:
The patent replaces the mechanical transfer-printing process with a deposition-based approach. Instead of mechanically transferring quantum dots from a donor substrate, the patent deposits quantum dots directly onto the patterned photoresist layer, allowing for precise control of quantum dot placement and achieving high-resolution patterns without serrated edges.
4Manufacturing precision
If inkjet printing is used to form patterned quantum dot layer, then the quantum dots can be deposited with precision, but the requirements for the inkjet printing device are severe and stability is difficult to maintain
Solution Approach 1:
The patent employs a self-aligned deposition process where the patterned photoresist layer automatically defines the deposition areas for quantum dots. This self-service approach eliminates the need for complex inkjet printing systems with precise positioning control, as the photoresist pattern itself guides the quantum dot deposition process, thereby simplifying the manufacturing equipment requirements.
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 method saves at least one round of photolithographic operation, simplifies the manufacturing process, reduces costs, and improves efficiency, while ensuring high precision and stability in forming quantum dot patterns, thus enhancing the production of quantum dot color filters.
Implementation Method 1
subjecting the transparent organic photoresist layer to patterning through a photolithographic operation
Implementation Method 2
subjecting an upper surface of the patterned transparent organic photoresist layer to hydrophobicity treatment
Implementation Method 3
the green quantum dot curable paste layer after being cured
Data Source
AI summary
The present invention provides a method for manufacturing a quantum dot color filter. The method for manufacturing a quantum dot color filter of the present invention, after forming a blue sub-pixel part of a quantum dot color filter by applying a photolithographic operation to a transparent organic photoresist material, applies hydrophobicity treatment to the transparent organic photoresist layer so as to make use of hydrophobic characteristics so formed to help coat green quantum dot curable paste and red quantum dot photoresist sequentially on corresponding areas to form, in sequence, a green quantum dot curable paste layer and a red quantum dot photoresist layer located thereon, and then applies photolithographic operations to subject portions of the red quantum dot photoresist layer to etching for forming a green sub-pixel part and a red sub-pixel part of the quantum dot color filter, whereby compared to the conventional ways of manufacturing a quantum dot color filter, at least one round of photolithographic operation can be saved to greatly simplify the manufacturing process, reduce cost, and improve manufacturing efficiency, and it only needs to develop one type of quantum dot photoresist so as to greatly reduce difficulty and cost of development.