Bridge Lines Reduce Peeling in LCD Sealant Interfaces
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Solution Overview
Problem
In liquid crystal display devices, the poor adhesion between metal lines and the planarization layer leads to peeling and liquid crystal leakage, especially when the display panel is compacted.
Innovation Solution
The introduction of bridge lines or dummy metal patterns under the sealant, which reduce the contact area with the planarization layer, and the use of a dielectric layer to improve adhesion, thereby minimizing peeling and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are disposed over the dielectric layer and contact the planarization layer, then electrical signals can be transmitted, but adhesion is poor and peeling occurs when impacted
Solution Approach 1:
The patent introduces a bridge line structure that acts as an intermediary between the metal line and the planarization layer. The bridge line is disposed over the dielectric layer and contacts the planarization layer, while the metal line is disposed over the bridge line. This intermediary structure distributes the mechanical stress and improves adhesion, preventing peeling when the display panel is impacted.
Solution Approach 2:
The patent segments the metal line structure by separating it into distinct components: the bridge line portion that contacts the planarization layer and the metal line portion that carries electrical signals. This segmentation allows each component to be optimized for its specific function - the bridge line for mechanical support and adhesion, and the metal line for electrical conductivity.
2Ease of manufacture
If metal lines contact the planarization layer, then electrical connection is established, but liquid crystal leakage occurs due to peeling
Solution Approach 1:
The bridge line serves as an intermediary structure that prevents direct contact between the metal line and the planarization layer in critical sealing areas. This intermediary structure maintains electrical connection while preventing the peeling that would compromise the sealant and cause liquid crystal leakage.
3Reliability
If the contact area between metal lines and planarization layer is large, then electrical connection is stable, but peeling is more likely under impact
Solution Approach 1:
The patent segments the electrical connection path into multiple stages: the bridge line provides mechanical support and adhesion to the planarization layer, while the metal line provides stable electrical connection. This segmentation allows the structure to maintain electrical stability while reducing susceptibility to impact damage by distributing mechanical stresses across different components.
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 reduced contact area between metal lines and the planarization layer eliminates peeling and reduces liquid crystal leakage, enhancing the structural integrity and reliability of the display panel.
Implementation Method 1
a working principle based on alignment alteration of liquid crystal molecules by application of an electrical field so as to change the path of light passing therethrough
Data Source
AI summary
A system for displaying images is disclosed. A display panel comprises a first substrate and a second substrate with a liquid crystal layer interposed therebetween. A sealant is interposed between the first substrate and a second substrate for sealing the liquid crystal layer. A dielectric layer is overlying the first substrate. Metal lines are overlying the dielectric layer under and/or near the sealant. A planarization layer covers and contacts the dielectric layer and the metal lines to form a first interface between the metal lines and the planarization layer and a second interface between the dielectric layer and the planarization layer. Bridge lines without contacting the planarization layer are disposed under and/or near the sealant, instead of at least a portion of the metal lines contacting the planarization layer.