Display Panel Test Line for Signal Integrity Detection
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Solution Overview
Problem
During the fabrication of display panels, existing methods fail to effectively check for broken signal lines without risking physical breakage of these lines, which is crucial for ensuring proper functionality and preventing defects in next-generation display devices with low power consumption and enhanced portability.
Innovation Solution
The proposed solution involves a display panel design with a test line system that includes a test line and test pad portion electrically connected to the gate line, allowing for the detection of breakages without direct physical contact, thus preventing breakage during the testing process. This system includes a first and second insulating layer with contact holes for electrical connection, enabling the use of an outer pin to assess signal line integrity without causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test operation is performed directly on the signal line to check for breakage, then the presence of broken signal lines can be detected, but the signal line may be physically broken during the test process
Solution Approach 1:
The patent introduces a test line as an intermediary element that is electrically connected to the signal line through a contact hole. The test operation is performed on the test line rather than directly on the signal line, allowing detection of signal line breakage while preventing physical damage to the signal line itself. The test line acts as a mediator that transfers the testing function away from the critical signal line.
Solution Approach 2:
The patent segments the testing function from the signal line by creating a separate test line structure. The test line is divided into a first test line portion and a second test line portion that are electrically connected through a contact hole penetrating the insulating layer. This segmentation allows the test operation to be isolated from the signal line, enabling safe detection of breakages.
2Measurement precision
If the test line is electrically connected to the gate line through a contact hole, then the test operation can assess signal line integrity, but the structure becomes more complex
Solution Approach 1:
The test line structure is designed to serve multiple functions: it provides a pathway for test operations, maintains electrical connection to the signal line through the contact hole, and prevents direct contact between the outer pin and the signal line. By consolidating these functions into a single test line structure, the patent avoids adding excessive complexity while achieving reliable signal line integrity assessment.
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
This approach allows for the reliable detection of broken signal lines without causing physical damage, ensuring the integrity of the display panel's signal lines and preventing defects, thereby supporting the development of low-power, portable display devices with improved reliability.
Implementation Method 1
a test line overlapping the non-display area and disposed on the first insulating layer, the test line being in electric contact with the gate line through a first contact hole defined in the first insulating layer
Data Source
AI summary
A display panel may include a first display substrate. The first display substrate may include a base layer defining a display area and a non-display area that is adjacent to the display area, a gate line disposed on the base layer, a first insulating layer disposed on the base layer and covering the gate line, and a test line overlapping the non-display area and disposed on the first insulating layer, the test line being in electric contact with the gate line through a first contact hole defined in the first insulating layer.