Display Panel Moisture-Proof Slit and Wiring Protection
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Solution Overview
Problem
Liquid crystal display panels face challenges in preventing moisture ingress, which can lead to corrosion of wiring lines due to potential differences, especially between adjacent wiring lines, affecting the reliability and longevity of the panels.
Innovation Solution
Incorporating a moisture-proof member filled in slits within the protective insulating film, which contacts the inorganic insulating film, and using a sealing member that blocks moisture, along with projections to control the sealing member's spread and prevent it from reaching the display region, thereby isolating the wiring lines from moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rectangular frame-like sealing member is used to bond the array substrate and counter substrate, then the substrates are effectively sealed, but moisture can still ingress through the frame region causing corrosion of wiring lines
Solution Approach 1:
The protective insulating film is divided into multiple regions: a first protective insulating film covering the wiring lines in the frame region, and a second protective insulating film in the display region. This segmentation allows different protection strategies for different areas, with the first film providing moisture barrier protection for the vulnerable wiring lines while the second film maintains display functionality.
Solution Approach 2:
A moisture-proof member is introduced as an intermediary element between the sealing member and the wiring lines. This moisture-proof member extends from the sealing member toward the display region and provides an additional barrier against moisture ingress, preventing moisture from reaching the wiring lines even when it penetrates through or near the sealing member.
2Reliability
If the protective insulating film covers the entire substrate including the frame region, then wiring lines are protected, but moisture can still reach the wiring lines through the frame region
Solution Approach 1:
The protective insulating film structure is designed with local quality variations: the first protective insulating film is specifically configured to cover wiring lines in the frame region with enhanced moisture barrier properties, while the second protective insulating film covers the display region. This localized differentiation ensures that the most vulnerable areas (wiring lines in frame region) receive targeted protection against moisture ingress.
Solution Approach 2:
The moisture-proof member serves as an intermediary barrier that extends from the sealing member toward the display region, positioned to intercept moisture before it can reach the wiring lines. This intermediate protection layer works in conjunction with the protective insulating films to provide multi-layered defense against moisture corrosion.
3Strength
If the sealing member is allowed to spread freely, then bonding is maximized, but the sealing member may reach the display region causing display defects
Solution Approach 1:
Projections are formed on the array substrate at predetermined positions before the sealing member is applied. These projections act as physical stoppers that preemptively limit the spread of the sealing member, ensuring that even when the sealing member is applied with maximum bonding strength, it cannot reach the display region and cause display defects.
Solution Approach 2:
The array substrate is designed with local structural variations through the formation of projections at specific locations in the frame region. These projections create localized physical barriers that differentially restrict sealing member spread in certain areas while allowing adequate bonding in other areas, thus maintaining both bonding strength and display quality.
Data Source
AI summary
According to one embodiment, a display panel includes an array substrate and a counter substrate. The array substrate includes an inorganic insulating film, a first wiring line, a second wiring line, an organic insulating film, a slit and a moisture-proof member. The slit is formed to extend through the organic insulating film between the first wiring line and the second wiring line. The moisture-proof member is filled in the slit and is in contact with the inorganic insulating film.