Display Panel Sealing Layer Design for Edge Light Leakage
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Solution Overview
Problem
Borderless liquid-crystal displays face issues with edge light leakage due to the detachment of black tape used for sealing, leading to low production yield and light leakage problems.
Innovation Solution
A display panel design incorporating a light-shading layer with light-blocking ink and a sealing-glue layer featuring hot-melt or light-curing glue, along with a protecting-glue layer, which provides enhanced light-shading, sealing, and impact resistance without the need for high adhesiveness, thereby preventing detachment and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black tape is used for sealing the edges of the display panel, then light leakage is prevented, but the tape detaches after a period of use causing production yield issues
Solution Approach 1:
The sealing structure is divided into two independent functional layers: a light-shading layer (using light-blocking ink) dedicated to preventing light leakage, and a sealing-glue layer (using hot-melt or light-curing glue) dedicated to providing durable adhesion. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The invention uses composite material structure combining light-blocking ink with specialized adhesives (hot-melt glue or light-curing glue). The composite structure integrates the light-shading function of the ink with the high-adhesiveness and durability of the specialized glue, achieving both light leakage prevention and long-term reliability.
2Device complexity
If traditional single-layer composite glue is used for sealing, then both light blocking and sealing functions are combined, but the material requires high adhesiveness and becomes brittle following temperature changes
Solution Approach 1:
The single-layer composite glue is segmented into two separate layers: a light-shading layer containing light-blocking ink for light blocking, and a sealing-glue layer containing hot-melt or light-curing glue for adhesion. This segmentation eliminates the need for the material to simultaneously possess conflicting properties, allowing each layer to be optimized for its specific function.
Solution Approach 2:
The invention changes the material parameters by selecting adhesives with specific properties: hot-melt glue provides high initial adhesion strength (40%-60% higher than other adhesives) and resistance to temperature-induced brittleness, while light-curing glue offers complete transparency, non-yellowing properties, and superior flexibility. These parameter changes resolve the stability issue under temperature changes.
3Object-affected harmful factors
If black tape is used for edge sealing, then light leakage is blocked, but adhesiveness deteriorates over time causing detachment
Solution Approach 1:
The sealing function is segmented into light blocking (light-shading layer with light-blocking ink) and adhesion (sealing-glue layer with hot-melt or light-curing glue). This segmentation allows the adhesion layer to use materials specifically selected for long-term durability and resistance to detachment, extending the sealing duration significantly.
Solution Approach 2:
The invention changes the adhesive parameters by using hot-melt glue with 40%-60% higher adhesive strength or light-curing glue with superior durability and flexibility. These parameter changes ensure the sealing maintains its integrity over extended periods, preventing the detachment issue that plagues traditional black tape solutions.
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 three-layer structure effectively prevents light leakage and detachment, enhancing production yield while reducing material requirements and maintaining durability and flexibility, outperforming traditional single-layer composite glues.
Implementation Method 1
light-blocking ink is used for the light-shading layer. The light-blocking ink may be black light-blocking ink, which meets the purpose of preventing the light leakage by blocking as well as absorbing the light
Implementation Method 2
The hot-melt glue is polyurethane reactive glue (PUR glue), the curing and crosslinking process of which is a reaction with moisture found in the air to form a stable chemical structure
Implementation Method 3
The light-curing glue is ultraviolet-ray-curing glue (UV glue), which is a type of adhesive that can only be cured under ultraviolet ray. The curing mechanism is that the photoinitiator (or photosensitizer) in the UV-curing material absorbs ultraviolet ray to generate active radicals or cations, which trigger monomer polymerization and a crosslinking chemical reaction to transform the liquid into a solid state
Data Source
AI summary
A display panel and a display device are provided. Wherein, the display panel includes a first substrate, a second substrate disposed opposite to the first substrate, and a sealing layer disposed on two ends of the display panel to seal the first substrate and the second substrate. The sealing layer includes a light-shading layer and a sealing-glue layer.