Shorting Bar Structure for TFT Substrate Testing
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Solution Overview
Problem
In the production of display devices, the test probe contact method often results in deviations and scratches on thin film transistor (TFT) wires due to the small spacing between wires, affecting test efficiency and stability, and the introduction of a shorting bar structure increases panel thickness and requires costly trimming for removal.
Innovation Solution
A shorting bar structure with a test wire and PN junction structure that allows unidirectional signal transmission between the test wire and the wires under test, eliminating the need for probe contact with multiple wires and reducing the risk of short circuiting, which can be integrated into a TFT substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If test probes contact with wire regions one by one to load signals, then signal loading can be achieved, but deviation occurs during contact which scratches wires and affects test effect
Solution Approach 1:
The patent introduces a shorting bar as an intermediary component that connects multiple wire regions together. Instead of having test probes contact individual wire regions directly, the test probe contacts the shorting bar which then distributes the signal to multiple wires. This intermediary structure eliminates direct probe-wire contact, preventing scratches and deviation issues while maintaining signal loading capability.
2Productivity
If shorting bar structure is introduced to reduce probe deviation, then test efficiency and stability increase, but panel border thickness increases
Solution Approach 1:
The patent implements the shorting bar structure as a thin film layer integrated into the panel's border region. Rather than adding a bulky three-dimensional structure, the shorting bar is formed as a conductive film that maintains electrical connectivity while occupying minimal space. This thin-film approach allows the shorting bar functionality to be incorporated without significantly increasing the panel's overall border thickness.
3Reliability
If shorting bar structure is used for testing, then test stability improves, but trimming must be performed after test to remove shorting bar, increasing production cost
Solution Approach 1:
The patent extracts the shorting bar structure from the permanent panel components and designs it as a temporary test-only element that can be selectively removed. The shorting bar is configured to be removable through simple trimming processes after testing is complete, allowing the panel to be restored to its original state without the shorting bar. This extraction approach maintains test stability benefits while reducing permanent structural changes and associated costs.
4Reliability
If shorting bar structure is not removed completely after test, then defects occur affecting panel quality, but complete removal requires costly trimming process
Solution Approach 1:
The patent incorporates preliminary design features into the shorting bar structure that facilitate easy and complete removal after testing. The shorting bar is designed with specific geometric characteristics and material properties that enable clean separation from the panel wires through minimal trimming. This preliminary preparation ensures that the shorting bar can be completely removed without leaving residues that would cause defects, while minimizing the trimming effort and cost required.
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 proposed solution reduces the likelihood of wire scratches and eliminates the need for post-test trimming, enhancing test efficiency and stability while minimizing production costs by ensuring accurate signal transmission without short circuiting between wires.
Implementation Method 1
at least one PN junction structure located between the test wire and at least one wire under test, and configured to allow a test signal to be unidirectionally transmittable in a direction from the test wire to the wire under test
Data Source
AI summary
The present disclosure provides a shorting bar structure and a method for manufacturing the same, and a Thin Film Transistor (TFT) substrate. The shorting bar structure comprises: a test wire; a test probe contact part connected to the test wire and configured to be able to contact with a test probe; and at least one PN junction structure located between the test wire and at least one wire under test, and configured to allow a test signal to be unidirectionally transmittable in a direction from the test wire to the wire under test.