Display Panel Blocking Structure for Conductive Adhesive Overflow
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Solution Overview
Problem
Liquid crystal display panels in the ADS mode face issues with greenish screen defects due to silver adhesive permeation, causing black matrix electrification and reduced yield, as the adhesive exceeds isolation regions during curing.
Innovation Solution
A display panel design incorporating a blocking structure between the array and opposite substrates to prevent conductive adhesive overflow, using isolation trenches and a blocking structure to confine the adhesive within specific regions, thereby preventing black matrix electrification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive adhesive is used to connect ground terminal with transparent conductive layer, then electrical connection is achieved, but adhesive may overflow into first part region causing black matrix electrification and greenish screen defects
Solution Approach 1:
The black matrix is segmented into first part and second part separated by an isolation trench. The isolation trench acts as a physical barrier that divides the black matrix into distinct regions, preventing conductive adhesive from the bonding area from overflowing into the first part region and causing electrification.
Solution Approach 2:
The isolation trench serves as an intermediary structure between the bonding area and the first part of the black matrix. This intermediate barrier structure blocks the path of conductive adhesive, allowing electrical connection to be maintained in the bonding area while preventing adhesive contamination of the first part.
2Object-affected harmful factors
If isolation trench is introduced to separate black matrix parts, then adhesive overflow is prevented, but device structure becomes more complex
Solution Approach 1:
The black matrix is segmented into first part and second part separated by an isolation trench. The isolation trench acts as a physical barrier that divides the black matrix into distinct regions, preventing conductive adhesive from the bonding area from overflowing into the first part region and causing electrification.
3Productivity
If blocking structure is added to prevent adhesive overflow, then yield is improved, but manufacturing process becomes more complex
Solution Approach 1:
The black matrix is segmented into first part and second part separated by an isolation trench. The isolation trench acts as a physical barrier that divides the black matrix into distinct regions, preventing conductive adhesive from the bonding area from overflowing into the first part region and causing electrification.
Solution Approach 2:
The isolation trench serves as an intermediary structure between the bonding area and the first part of the black matrix. This intermediate barrier structure blocks the path of conductive adhesive, allowing electrical connection to be maintained in the bonding area while preventing adhesive contamination of the first part.
Data Source
AI summary
The present disclosure provides a display panel and a display device, the display panel includes: an array substrate and an opposite substrate disposed oppositely, the array substrate having a ground terminal, the opposite substrate including a black matrix and a transparent conductive layer, the black matrix including a first part, a second part and an isolation trench which are sequentially disposed, and the isolation trench isolating the first part from the second part; a conductive adhesive connecting the ground terminal with the transparent conductive layer, a part of the conductive adhesive being between the array substrate and the opposite substrate, and orthographic projections of the part of the conductive adhesive and the first part on the array substrate being not overlapped; and a blocking structure in contact with the part of the conductive adhesive and configured for preventing the conductive adhesive from overflowing to the first part.