Electronic Paper Display Border Structure Adhesion
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Solution Overview
Problem
Mura defects, or uneven defects, occur in electronic paper displays due to non-uniform electrical field distribution caused by peel-offs at the interface between the glue layer and border electrode, especially under high temperature and humidity conditions.
Innovation Solution
A border structure for electronic paper displays is introduced, featuring a glue layer with downward extruding portions to enhance adhesive strength, which adheres not only to the border electrode but also to the planarization layer, thereby increasing contact area and preventing moisture and air ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glue layer is applied between the border electrode and the planarization layer, then the border electrode can be fixed in position, but the adhesive strength is insufficient under high temperature and humidity conditions causing peel-offs
Solution Approach 1:
The patent divides the glue layer into multiple segments by forming protrusions that extend downward into the planarization layer. This segmentation increases the bonding interface area and creates mechanical interlocking, preventing peel-off under high temperature and humidity conditions.
Solution Approach 2:
The patent transitions from a two-dimensional planar glue layer to a three-dimensional structure with downward extruding portions. These portions extend into the planarization layer, creating anchoring effects that significantly enhance adhesive strength and resistance to peel-off forces.
2Device complexity
If the glue layer adheres only to the border electrode, then the structure is simple, but the adhesive effect is weak and allows moisture and air ingress
Solution Approach 1:
The glue layer is segmented into multiple bonding zones: one adhering to the border electrode and another adhering to the planarization layer through downward extruding portions. This segmentation creates a dual-anchor structure that effectively seals the border region against moisture and air ingress.
3Device complexity
If the electrical field distribution is non-uniform due to peel-offs, then the border electrode structure is simple, but mura defects occur in the display
Solution Approach 1:
The patent implements preliminary reinforcement of the glue layer adhesion before peel-offs can occur. By forming downward extruding portions that create mechanical interlocking with the planarization layer, the structure prevents peel-off defects that would otherwise cause non-uniform electrical field distribution and mura defects in the display.
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 enhanced adhesive effect reduces the occurrence of mura defects and prolongs the operational life of electronic paper displays without altering materials or adding compositions, utilizing standard manufacturing processes.
Implementation Method 1
When a voltage difference is applied between the border electrode 120 and the ITO layer 113, an electrical field will be generated accordingly to effect micro capsules or micro cups of the electrophoretic display layer 112 in the border region
Data Source
AI summary
A border structure for viewable area of electronic paper display, including: a planarization layer; a border electrode, made of metal and disposed on the planarization layer; a glue layer, disposed on the border electrode and having on its bottom surface at least one downward extruding portion for enhancing its adhesive strength; and an electrophoretic display layer, disposed on the top surface of the glue layer.