Pixel Array Substrate First Patterns for Sealant Deviation
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Solution Overview
Problem
In the manufacturing of free-form display panels, the sealant at the bending segment of the edge of the substrate tends to deviate, making accurate coating challenging.
Innovation Solution
A pixel array substrate design that includes a substrate with active and peripheral areas, featuring pixel structures, a peripheral trace with a curve segment, and first patterns with trunk and branch portions, which help monitor and correct the sealant deviation by providing a precise alignment and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is coated along the edge of free-form substrate, then sealing function is achieved, but sealant deviation occurs at bending segments
Solution Approach 1:
The patent applies preliminary action by pre-establishing the first pattern structure with trunk and branch portions on the substrate before sealant coating. This pattern serves as a pre-prepared reference framework that guides the sealant coating process, allowing the coating equipment to align with the branch portions and accurately deposit sealant even at bending segments of free-form substrates, thereby preventing sealant deviation while maintaining sealing quality
Solution Approach 2:
The first pattern acts as an intermediary element between the substrate edge and the sealant coating process. The trunk portion connected to the peripheral trace and the branch portions extending toward the edge create a mediating reference structure that translates the complex free-form geometry into manageable alignment features, enabling precise sealant placement without directly confronting the coating equipment with the challenging bending segment geometry
2Measurement precision
If first pattern is added to monitor sealant deviation, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The first pattern structure serves multiple functions simultaneously: it provides electrical connectivity through the trunk portion connected to the peripheral trace, offers alignment references through the branch portions for sealant coating, and enables deviation monitoring by serving as a fixed reference framework. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving precise measurement capabilities
Solution Approach 2:
The patent merges the electrical trace function with the measurement reference function by integrating the first pattern into the existing peripheral trace structure. The trunk portion continues the electrical connectivity while the branch portions simultaneously serve as alignment and measurement references, combining multiple functions into a single integrated structure rather than adding separate independent components
Data Source
AI summary
A pixel array substrate includes a substrate, a plurality of pixel structures, a peripheral trace and a plurality of first patterns. The substrate has an active area and a peripheral area outside the active area. The plurality of pixel structures is disposed in the active area of the substrate. Each of the pixel structures includes a signal line, an active device electrically connected to the signal line and a pixel electrode electrically connected to the active device. The peripheral trace is disposed in the peripheral area of the substrate. A plurality of first patterns is disposed in the peripheral area of the substrate. Each of the first patterns includes a first trunk portion and at least one first branch portion crossed with the first trunk portion. The first trunk portion is electrically connected to the peripheral trace or the signal line of the pixel structure.