Display Bonding Layer Layout for Precise Light-Emitter Transfer
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Solution Overview
Problem
The challenge of suppressing bonding defects and improving the transfer yield of light-emitting elements in display devices, particularly during the process of transferring light-emitting elements to a display panel, is addressed.
Innovation Solution
A display device design incorporating a bonding layer with distinct areas of varying tangent delta values, where the first area has a low tangent delta value for enhanced bonding and the second area has a higher tangent delta value to prevent undesired transfer, utilizing a polymer-based bonding material with specific monomer compositions to enhance adhesion and prevent light-emitting elements from being transferred to incorrect areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bonding layer with uniform properties is used, then the bonding process is simple, but light-emitting elements may be transferred to undesired areas reducing transfer yield
Solution Approach 1:
The bonding layer is segmented into multiple areas with different tangent delta values. The first area has a first tangent delta value for strong bonding to light-emitting elements, while the second area has a second tangent delta value (higher than the first) to prevent undesired transfer. This segmentation allows precise control of element placement and improves transfer yield.
Solution Approach 2:
Different areas of the bonding layer are assigned different local properties (tangent delta values) based on their functional requirements. The first area optimized for bonding strength has lower tangent delta, while the second area optimized for preventing transfer has higher tangent delta. This local quality differentiation resolves the contradiction between simple structure and high transfer yield.
2Strength
If the tangent delta value of the bonding layer is low to enhance bonding, then bonding strength improves, but light-emitting elements may transfer to undesired areas
Solution Approach 1:
The bonding layer exhibits local quality variations with different tangent delta values in different areas. The first area has lower tangent delta for strong bonding strength, while the second area has higher tangent delta for transfer precision control. This resolves the contradiction between bonding strength and transfer precision.
Solution Approach 2:
The bonding layer is divided into functional segments: a first area for strong element bonding (lower tangent delta) and a second area for preventing undesired transfer (higher tangent delta). This segmentation enables simultaneous achievement of bonding strength and transfer precision.
3Reliability
If a bonding layer with high tangent delta value is used, then transfer control improves, but bonding strength between light-emitting elements and bonding layer decreases
Solution Approach 1:
Different areas of the bonding layer have different tangent delta values optimized for their specific functions. The second area has higher tangent delta for improved transfer control, while the first area has lower tangent delta for maintaining bonding strength. This local quality approach resolves the contradiction.
Solution Approach 2:
The bonding layer is segmented into a first area for bonding (lower tangent delta) and a second area for transfer control (higher tangent delta). This functional segmentation allows the system to achieve both strong bonding and precise transfer control simultaneously.
4Productivity
If the stamp is used multiple times for transferring light-emitting elements, then productivity increases, but bonding defects may accumulate reducing transfer yield
Solution Approach 1:
The bonding layer is pre-configured with areas of different tangent delta values before the transfer process. This preliminary structural preparation ensures consistent bonding performance across multiple stamping operations, preventing defect accumulation and maintaining high transfer yield while enabling repeated use of the stamp for improved productivity.
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 reduces bonding defects and improves the transfer yield of light-emitting elements, ensuring robust bonding and minimizing visual defects caused by concave-convex patterns, thereby enhancing the overall process efficiency and reliability of the display device.
Implementation Method 1
a bonding layer disposed on the thin-film transistor and comprising a first area, and a second area having a higher tangent delta value than the first area
Data Source
AI summary
Provided is a display device. The display device includes a substrate comprising a plurality of subpixels; a thin-film transistor on the substrate; a bonding layer on the thin-film transistor; a first area and a second area having a higher tangent delta value than the first area; and a plurality of light-emitting elements disposed in the first area of the bonding layer corresponding to the plurality of subpixels. The invention allows suppressing a bonding defect of a light-emitting element.