OLED Wrinkle Protection Layer for Lateral Color Shift
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience color shift when viewed from the side due to the emission angle of light generated by the organic light emitting elements, affecting display quality.
Innovation Solution
A manufacturing method for OLED displays that involves forming a protection layer with a wrinkle structure on the substrate, where the first protection layer has a lower modulus value than the second protection layer by at least 300 MPa, preventing color shift and improving manufacturing yield through a deposition process without the need for a separate mask process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat protection layer is used, then the manufacturing process is simple, but color shift occurs in lateral viewing angles
Solution Approach 1:
The invention applies a wrinkle structure (curved surface) to the protection layer to reduce color shift in lateral viewing angles. The wrinkle structure modifies the light emission angle characteristics, allowing the OLED display to maintain color accuracy when viewed from different angles, thus resolving the contradiction between manufacturing simplicity and color shift prevention.
Solution Approach 2:
The invention changes the physical parameters of the protection layer by creating a wrinkle structure with specific modulus values (first modulus value less than second modulus value by at least 300 MPa). This parameter change transforms the flat protection layer into a textured surface that controls light emission angles, effectively reducing color shift while maintaining manufacturing feasibility through deposition processes.
2Object-affected harmful factors
If a wrinkle structure is formed on the protection layer, then color shift is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The invention replaces mechanical wrinkle formation methods (such as separate mask processes or physical structuring) with a deposition process that forms the wrinkle structure through material layering. By controlling the deposition conditions and material properties (modulus differences), the wrinkle structure is created automatically during the manufacturing process, reducing process complexity while achieving the desired optical effect.
3Manufacturing precision
If a separate mask process is used to form wrinkles, then the wrinkle structure is precise, but manufacturing yield decreases
Solution Approach 1:
The invention merges the wrinkle formation process with the protection layer deposition process. Instead of using a separate mask process to create wrinkles after deposition, the wrinkle structure is formed simultaneously with the protection layer through controlled deposition of multiple layers with different modulus values. This integration eliminates the need for additional masking steps, improving manufacturing yield while maintaining wrinkle structure precision.
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 wrinkle structure on the protection layer reduces color shift in lateral viewing angles, enhancing display quality and simplifying the manufacturing process by eliminating the need for additional processing steps.
Implementation Method 1
forming a protection layer by using a deposition method on an entire surface of the substrate, and forming an organic light emitting element on the protection layer
Implementation Method 2
A first modulus value of the first protection layer is less than a second modulus value of the second protection layer by at least 300 MPa
Data Source
AI summary
A method for manufacturing an organic light emitting diode display includes forming a thin-film transistor on a substrate, forming a protection layer by using a deposition method on an entire surface of the substrate, and forming an organic light emitting element on the protection layer. Forming the protection layer includes forming a first protection layer, a surface thereof including a first wrinkle, and forming a second protection layer on the first protection layer, a surface thereof including a second wrinkle. A first modulus value of the first protection layer is less than a second modulus value of the second protection layer by at least 300 MPa.