Array Substrate Buffer Layer Detection via Organic Film Vias
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Solution Overview
Problem
Existing array substrate manufacturing methods fail to detect the absence of a buffer layer under an organic film, leading to product quality risks due to equipment malfunctions or errors, as existing detection methods cannot recognize this defect until long-term use, resulting in performance instability and quality issues.
Innovation Solution
The method involves forming vias in the organic film that partially overlap with adjacent data lines, allowing a first conductive layer to short adjacent data lines when the buffer layer is absent, enabling detection of signal shorts during array detection, and arranging pixel detection units in a dummy pixel region to avoid affecting normal pixel regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic film process is used to reduce coupling capacitance and enhance aperture ratio, then power consumption is reduced, but the buffer layer cannot be detected until long-term use, leading to performance instability
Solution Approach 1:
The patent applies preliminary action by forming vias in the organic film that overlap with data lines during the manufacturing process, before the buffer layer defect would cause performance issues. This allows detection to occur early in production rather than during long-term use, preventing defective products from being shipped while maintaining the organic film process benefits.
Solution Approach 2:
The patent introduces an intermediary detection mechanism using vias and conductive layers that create a detectable signal path. The via structure acts as an intermediary element that enables indirect detection of the buffer layer's presence through electrical continuity testing, making the undetectable buffer layer visible to quality control processes.
2Difficulty of detecting and measuring
If vias are formed to overlap with data lines for detection purposes, then buffer layer absence can be detected, but adjacent data lines may be shorted
Solution Approach 1:
The patent applies local quality by forming vias with specific local overlapping relationships with data lines rather than uniform coverage. The via structure is designed to overlap only with portions of adjacent data lines in a controlled manner, creating localized detection points while maintaining electrical isolation in other areas, thus enabling detection without causing shorts.
Solution Approach 2:
The patent uses partial action by forming vias that partially overlap with data lines rather than completely covering them. This partial overlapping is sufficient to detect buffer layer absence through the conductive path it creates, but limited enough to avoid creating harmful short circuits between adjacent data lines.
3Measurement precision
If pixel detection units are added to detect buffer layer defects, then product quality improves, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the detection function with existing manufacturing structures by integrating vias and conductive layers into the standard array substrate fabrication process. Rather than adding separate detection equipment or complex testing apparatus, the detection capability is combined with the organic film formation and electrode structure creation, streamline the process while enabling detection.
Solution Approach 2:
The via structure serves multiple functions: it acts as both a conductive element for electrical continuity and a detection feature for buffer layer verification. This multi-functionality eliminates the need for separate detection mechanisms, reducing overall manufacturing complexity while maintaining high detection precision.
Data Source
AI summary
A method for manufacturing an array substrate, including forming at least two data lines, forming a buffer layer on the data lines, forming an organic film, which is provided with vias, on the buffer layer, the vias being in a partially overlapping relationship with the orthographic projection of the two adjacent data lines on a base substrate, forming a first conductive layer on the organic film.