Display Panel Recess Sealant Adhesion Narrow Frame
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Solution Overview
Problem
Narrow-frame designs in TFT-LCDs face challenges in peeling tests due to reduced relative contact area between the frame sealant and substrate, as the distance between metal lines decreases, complicating the arrangement and limiting the position and width of through-holes for the frame sealant.
Innovation Solution
The introduction of recess parts in the organic layer, where the frame sealant is filled, with depths less than the organic layer thickness, increases the relative contact area between the frame sealant and substrate, enhancing adhesion strength and improving peeling test pass rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame is narrowed to achieve a narrow-frame design, then the display area is increased and the frame width is reduced, but the distance between metal lines becomes smaller and the arrangement of metal lines becomes complicated, which limits the position and width of through-holes for the frame sealant
Solution Approach 1:
The invention transitions from a two-dimensional through-hole arrangement (limited by metal line spacing) to a three-dimensional recess structure. By creating recesses that extend vertically into the organic layer, the frame sealant gains additional contact area with the substrate without requiring larger horizontal spacing between metal lines. This dimensional change allows the frame sealant to overcome the limitations imposed by narrow frame designs and complicated metal line arrangements.
2Strength
If through-holes are defined between adjacent metal lines to increase relative contact area, then adhesion strength is improved, but the position and width of through-holes are limited by the metal line arrangement
Solution Approach 1:
The invention divides the contact area between the frame sealant and substrate into multiple segments: the top surface contact area and the lateral contact area formed by the recess walls. This segmentation allows the frame sealant to establish adhesion through multiple pathways, increasing the overall relative contact area and adhesion strength while being less constrained by the specific position and width limitations imposed by metal line arrangements.
3Reliability
If the relative contact area between frame sealant and substrate is increased to pass peeling tests, then adhesion strength is improved, but the complicated arrangement of metal lines in narrow frames limits the through-hole configuration
Solution Approach 1:
The invention creates a recess structure that copies or replicates the metal line pattern in its lateral walls. By forming recesses that follow the contours of the underlying metal lines, the frame sealant achieves extensive lateral contact area with the substrate without requiring changes to the metal line arrangement itself. This approach maintains the necessary adhesion strength for peeling test compliance while working within the constraints of the existing complicated metal line configuration.
Data Source
AI summary
A first recess part is defined on an organic layer disposed in a non-display area, and a frame sealant is filled in the first recess part. A depth of the first recess part is less than a thickness of the organic layer. Therefore, a relative contact area between the frame sealant and a first substrate is increased. As such, strength of adhesion between the frame sealant and the substrate is further increased, and a capability of panels to pass peeling tests is improved.