Liquid Crystal Panel Seal Bonding via Alignment Film Defining Part
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Solution Overview
Problem
The conventional liquid crystal panel structure, where the alignment film overlaps with the sealing member, results in insufficient bonding strength between the sealing member and the substrate, leading to a risk of seal part removal.
Innovation Solution
A display panel design featuring a pair of substrates with a seal part in the non-display region, an insulating film across both regions, and a defining part formed of the insulating film to prevent alignment film buildup and ensure direct contact between the seal part and the substrate, enhancing bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the alignment film is allowed to extend across the entire substrate including the non-display region, then the alignment film thickness becomes even and manufacturing is simplified, but the sealing member cannot directly bond to the substrate resulting in insufficient bonding strength
Solution Approach 1:
The patent applies local quality by creating a defining part with insulating film that selectively prevents alignment film formation only in the specific region where the sealing member contacts the substrate. This localized modification allows the alignment film to extend uniformly across most of the substrate while creating a localized non-disposed region that enables direct sealing member-to-substrate bonding, thus resolving the contradiction between uniform alignment film thickness and sufficient bonding strength.
2Strength
If the sealing member contacts the substrate directly, then bonding strength is maximized, but the alignment film cannot properly align the liquid crystal layer resulting in display unevenness
Solution Approach 1:
The patent segments the substrate surface into two functional regions: a majority region where the alignment film extends to ensure proper liquid crystal alignment, and a localized non-display region where the defining part creates an alignment film non-disposed region allowing direct sealing member-to-substrate contact. This segmentation enables both functions to coexist without interference, resolving the contradiction between bonding strength and alignment precision.
3Strength
If the alignment film is prevented from forming in the non-display region using a defining structure, then bonding strength increases, but the alignment film material may build up midway during formation process
Solution Approach 1:
The defining part formed of insulating film acts as an intermediary structure that selectively blocks alignment film material during the formation process. By positioning this defining part only in the non-display region where the sealing member contacts the substrate, it prevents alignment film formation locally while allowing the alignment film material to spread uniformly across the display region and most of the non-display region, thus preventing buildup midway while enabling direct bonding.
Data Source
AI summary
A liquid crystal panel includes a pair of substrates, a seal part between the pair of substrates and in a non-display region to surround and seal the liquid crystal layer, a planarizing film and a second interlayer insulating film being insulating films on the array substrate across a display region and the non-display region, an alignment film on the array substrate closer to the liquid crystal layer than the planarizing film and the second interlayer insulating film are, the alignment film being disposed across the display region and the non-display region, and a defining part formed of the planarizing film and the second interlayer insulating film, which are insulating films, the defining part being disposed at a position overlapping with the seal part in the non-display region, to define an alignment film non-disposed region where the alignment film is not disposed.