Array Substrate Groove Sealing for Display Moisture Resistance
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Solution Overview
Problem
In display technology, the organic layer in array substrates can crack during pressure cooker tests due to thermal expansion, allowing moisture to enter the display panel and degrade its performance.
Innovation Solution
An array substrate design with a base substrate, organic layer, and passivation layer, featuring a groove in the non-display region that is filled with a sealing material to prevent moisture ingress, even if cracks form during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic layer is arranged between the source-drain metal layer and the transparent conductive layer to reduce capacitance, then the capacitance between the source-drain metal layer and the transparent conductive layer is reduced, but the organic layer generates cracks during PCT due to thermal expansion
Solution Approach 1:
The array substrate is divided into a display region and a non-display region. The organic layer is selectively arranged only in the display region, while the non-display region contains a groove structure filled with sealing material. This segmentation allows the organic layer to maintain its capacitance-reducing function in the display area while avoiding thermal expansion cracks in the non-display area.
Solution Approach 2:
Different regions of the array substrate are given different structural characteristics. The display region has the organic layer for capacitance reduction, while the non-display region has a groove structure with sealing material for crack prevention and moisture sealing. This local quality differentiation resolves the contradiction by optimizing each region for its specific function.
2Temperature
If the organic layer expands under high temperature during PCT, then the organic layer generates cracks, but the passivation layer also generates cracks due to the force caused by expansion
Solution Approach 1:
The structure is segmented into display and non-display regions with different configurations. The non-display region contains a groove that accommodates the organic layer's thermal expansion without transmitting stress to the passivation layer, thereby preventing crack propagation while allowing the display region to maintain its functional integrity.
Solution Approach 2:
The groove structure filled with sealing material acts as an intermediary between the organic layer and the passivation layer in the non-display region. It absorbs and isolates the expansion forces, preventing direct stress transmission that would cause cracks in the passivation layer while maintaining the overall structural integrity.
3Reliability
If cracks are generated in the organic layer and passivation layer during PCT, then moisture enters the display region through the cracks, but display quality is adversely affected
Solution Approach 1:
The array substrate is segmented into display and non-display regions. The non-display region contains a groove structure filled with sealing material that creates a moisture barrier. This segmentation prevents moisture from entering through cracks in the organic or passivation layers by providing an alternative sealed path around the display region.
Solution Approach 2:
The sealing material in the groove acts as an intermediary barrier that blocks moisture ingress. Even when cracks occur in the organic or passivation layers, the sealing material in the groove prevents moisture from reaching the display region, thereby protecting display quality while maintaining the functional integrity of the display area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sealing material effectively isolates the organic and passivation layers, preventing moisture from entering the display region and maintaining display quality despite potential cracking during high-temperature tests.
Implementation Method 1
the organic layer may generate cracks during the PCT because the organic layer may expand under high temperature
Data Source
AI summary
An array substrate, a display panel, a display device, a method for manufacturing the array substrate and a method for manufacturing the display panel are provided. The array substrate includes a base substrate, and an organic layer and a passivation layer arranged above the base substrate. The base substrate includes a display region and a non-display region surrounding the display region. Each of the organic layer and the passivation layer is arranged in both the display region and the non-display region. A groove is arranged in the organic layer and the passivation layer in the non-display region, the groove penetrates the organic layer and the passivation layer and is of a closed pattern surrounding the display region. The groove is to be filled with a sealing material.