Light-Emitting Element Bonding for Stable Display Pixel Alignment
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Solution Overview
Problem
Existing display devices face challenges in maintaining the alignment of light-emitting elements during the fabrication process, leading to potential emission reliability issues due to hydrodynamic forces applied during the drying of alignment solutions.
Innovation Solution
A display device design that incorporates a second insulating layer capable of forming covalent bonds with light-emitting elements, using a binding group and functional group chemical reaction to fix the elements in place, thereby reducing alignment changes and improving emission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements are placed on an insulating layer during fabrication, then alignment can be maintained, but hydrodynamic forces during drying of alignment solutions cause position changes and reduce emission reliability
Solution Approach 1:
The patent introduces a binding group on the insulating layer that acts as an intermediary to chemically bond with the light-emitting element. This chemical bonding mechanism mediates between the insulating layer and the light-emitting element, preventing position changes caused by hydrodynamic forces during drying while maintaining precise alignment.
Solution Approach 2:
The patent changes the bonding parameter from weak physical adhesion to strong covalent chemical bonding. By introducing functional groups that form covalent bonds with the light-emitting element, the bonding strength parameter is significantly increased, preventing position changes during the drying process and improving emission reliability.
2Manufacturing precision
If conventional physical adhesion is used to fix light-emitting elements, then alignment can be achieved, but the bonding strength is insufficient to resist hydrodynamic forces during drying
Solution Approach 1:
The patent fundamentally changes the bonding strength parameter by transitioning from weak physical adhesion to strong covalent chemical bonding. The binding group with functional groups forms covalent bonds with the light-emitting element, increasing bonding strength by several orders of magnitude to resist hydrodynamic forces during drying.
Solution Approach 2:
The patent creates a composite structure combining the insulating layer, binding group, and light-emitting element. This composite material system integrates multiple components with different functions: the insulating layer provides electrical isolation, the binding group provides chemical bonding capability, and the light-emitting element provides light emission, achieving both alignment and strong bonding.
3Ease of manufacture
If no chemical bonding mechanism is introduced, then the fabrication process remains simple, but light-emitting elements cannot be firmly fixed and alignment changes occur
Solution Approach 1:
The patent changes the bonding mechanism parameter from none/weak to strong covalent bonding by introducing functional groups on the binding group. This chemical bonding parameter change enables firm fixation of light-emitting elements without significantly complicating the fabrication process, as the functional groups are formed during the insulating layer formation step.
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 covalent bonding between the light-emitting elements and the insulating layer effectively stabilizes their position, enhancing the alignment and emission reliability of pixels in the display device.
Implementation Method 1
a binding group coupled to the insulation film... another functional group substituted on the main chain... the another functional group may form a covalent bond with the functional group
Implementation Method 2
at least a part of a lower surface of the light-emitting element may be chemically bonded to the second insulating layer
Data Source
AI summary
A display device includes a first electrode, a second electrode spaced apart from the first electrode and facing the first electrode, a first insulating layer disposed to at least partially cover the first electrode and the second electrode, a second insulating layer disposed on at least a part of the first insulating layer, and a light-emitting element disposed on the second insulating layer between the first electrode and the second electrode, wherein at least a part of a lower surface of the light-emitting element is chemically bonded to the second insulating layer.