Liquid Crystal Display Panel Sealant Overlap Contact
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Solution Overview
Problem
The etching process for forming data and gate pad upper electrodes in liquid crystal display panels often causes corrosion of the data pad lower electrode, leading to a loss of contact and inability to supply data signals.
Innovation Solution
A liquid crystal display panel design where a contact part is formed to overlap a sealant, connecting signal lines to pad electrodes on different planes, preventing corrosion and reducing the liquid crystal margin area by exposing the electrodes through specific contact holes in the gate and passivation films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the etching process is used to form data and gate pad upper electrodes, then the electrodes can be formed on the substrate, but the data pad lower electrode becomes corroded and loses contact
Solution Approach 1:
A sealant layer is introduced as an intermediary substance between the data pad lower electrode and the external environment. This sealant prevents moisture and impurities from reaching and corroding the electrode, thereby maintaining reliable electrical contact while allowing the etching process to proceed for electrode formation.
Solution Approach 2:
The sealant is applied in advance before the etching process to protect the data pad lower electrode. This preliminary protective action prevents the harmful effects of moisture and chemicals during the etching process, ensuring the electrode remains intact and functional.
2Device complexity
If the contact part is formed away from the sealant area, then the electrode structure is simpler, but the liquid crystal margin area increases
Solution Approach 1:
The contact part is positioned in the vertical dimension by overlapping with the sealant layer, rather than being separated in the horizontal plane. This dimensional repositioning allows the contact part to be formed within the existing sealant area, eliminating the need for additional horizontal space and reducing the liquid crystal margin area without increasing structural complexity.
Data Source
AI summary
This invention relates to a liquid crystal display panel adapted to prevent corrosion of a pad electrode and reduce a liquid crystal margin area, and a fabricating method thereof. A liquid crystal display panel includes first and second substrates bonded with a sealant; a signal line on the first substrate; a pad formed on a different plane than the signal line; and a contact part overlapping the sealant and connecting the signal line to the pad.