Inorganic Insulation Layer for LCD Moisture Protection
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Solution Overview
Problem
Liquid crystal display devices face reliability issues due to moisture infiltration, which damages the driving circuit, and reduced bezel areas lead to increased touch line resistance and decreased sealant adhesion, affecting the overall performance and aesthetics of the devices.
Innovation Solution
The implementation of an inorganic insulation layer in direct contact with the inorganic layer of the lower substrate to minimize moisture infiltration, along with upper and lower openings to enhance sealant adhesion, and the use of metal lines on different planes to reduce touch line resistance and prevent overlap between the alignment layer and sealant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an organic insulation layer is used to flatten the lower substrate, then the top surface is flattened and foreign material infiltration is suppressed, but moisture infiltrates through the interface between the organic insulation layer and inorganic layer, causing circuit line erosion
Solution Approach 1:
The patent employs a composite insulation layer structure combining organic and inorganic materials. The organic insulation layer provides surface flattening and foreign material protection, while the inorganic insulation layer overlaid on top provides moisture barrier protection. This composite structure resolves the contradiction by allowing each material to perform its optimal function without compromising the other.
Solution Approach 2:
The patent applies different material properties to different regions/layers of the insulation structure. The organic layer addresses surface flatness requirements, while the inorganic layer specifically addresses moisture resistance at the critical interface region. This localized application of material properties resolves the contradiction between surface quality and moisture protection.
2Area of stationary object
If the bezel area is reduced to improve aesthetics and reduce device size, then the device becomes more compact and aesthetic, but the driving circuit becomes more susceptible to moisture infiltration and erosion
Solution Approach 1:
The patent addresses the moisture protection problem by transitioning from a two-dimensional planar protection approach to a multi-layered vertical structure. By stacking organic and inorganic insulation layers in the vertical dimension, the patent provides effective moisture barrier protection even when the horizontal bezel area is reduced, thus resolving the contradiction between compactness and reliability.
3Area of stationary object
If the alignment layer and sealant overlap due to reduced bezel area, then the device achieves compact design, but the adhesion of the sealant decreases and sealing function is reduced
Solution Approach 1:
The patent introduces a protrusion structure that segments the sealant application area, creating a dedicated sealing region that prevents overlap with the alignment layer. This segmentation allows the sealant to maintain optimal adhesion strength while the device achieves compact bezel dimensions, resolving the contradiction between compactness and sealing strength.
4Reliability
If metal lines are routed on the lower substrate to reduce touch line resistance, then touch signal transmission improves, but the lines are exposed to moisture infiltration and erosion
Solution Approach 1:
The patent introduces an inorganic insulation layer as an intermediary protective barrier between the moisture environment and the metal touch lines. This intermediary layer allows the metal lines to maintain their low-resistance electrical connection while being protected from moisture erosion, thus resolving the contradiction between signal transmission quality and moisture protection.
Data Source
AI summary
A liquid crystal display device is provided. The liquid crystal display device includes a driving circuit; a lower insulation layer; an upper insulation layer; and an inorganic insulation layer. The driving circuit is disposed in a bezel area on a lower substrate. The lower insulation layer includes a lower opening through which an inorganic layer on the lower substrate is exposed and the lower opening is located at an outer side of the lower substrate than the driving circuit. The upper insulation layer is disposed on the lower insulation layer and includes an upper opening corresponding to the lower opening. The inorganic insulation layer is disposed on the upper insulation layer and in direct contact with the inorganic layer on the lower substrate so as to minimize damage to the driving circuit caused by infiltration of moisture from the outside.