Display Substrate Test Wire Connection for Brightness Uniformity
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Solution Overview
Problem
Current display substrates face issues with brightness unevenness and color shift defects due to test wires, which can mask inherent defects and reduce defect detection rates, leading to increased manufacturing costs and resource waste.
Innovation Solution
The display substrate design includes a peripheral region with leading wires and test wires connected at specific resistance points, ensuring uniform voltage signal amplitude and phase delay across the display region, reducing brightness differences and color shifts during the test process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If test wires are connected to the display substrate for defect detection, then defect detection capability is improved, but brightness uniformity deteriorates due to voltage signal amplitude differences and phase delays
Solution Approach 1:
The patent applies equipotentiality by connecting test wires to the leading wire at a specific resistance ratio point (first resistance point) rather than directly to signal wires. This configuration ensures that test signal connections do not create potential differences that would cause brightness non-uniformity, while still enabling defect detection through the leading wire structure.
Solution Approach 2:
The leading wire serves as an intermediary element between the test wire connection and the signal wire network. By connecting the test wire to the leading wire at a controlled resistance point, the patent mediates the test signal injection to avoid direct interference with signal wire voltage distribution, thus preventing brightness non-uniformity while maintaining defect detection capability.
2Ease of operation
If test wires are connected directly to signal wires for testing, then testing simplicity is improved, but color accuracy deteriorates due to phase delays and voltage drops
Solution Approach 1:
The leading wire acts as an intermediary that simplifies test wire connection while maintaining color accuracy. Instead of requiring direct connections to multiple signal wires, the test wire connects to the leading wire at a controlled resistance point, which then distributes test signals through the signal wire network without causing problematic phase delays or voltage drops.
Solution Approach 2:
The patent changes the connection parameter from direct signal wire attachment to leading wire attachment at a specific resistance ratio point. This parameter change controls the electrical characteristics of the test signal path, minimizing phase delays and voltage drops that would otherwise cause color shifts during testing.
3Measurement precision
If multiple test wire connection points are added to improve detection coverage, then defect detection rate is improved, but device complexity increases
Solution Approach 1:
The leading wire serves multiple functions: it acts as a signal distribution path for normal operation and as a test signal injection point for defect detection. By making the leading wire multi-functional, the patent enables comprehensive defect detection without adding separate dedicated test structures, thus avoiding increased device complexity.
Solution Approach 2:
The leading wire structure enables universal test signal distribution to multiple signal wires through a single connection point. This multi-functionality allows comprehensive defect detection across the display substrate without requiring multiple separate test wire connections, thereby maintaining structural simplicity.
Data Source
AI summary
A display substrate, a display device and a test method of the display substrate are disclosed. The display substrate includes a display region and a peripheral region. The peripheral region includes: a first leading wire extending in a first direction and including a first end and a second end; a first test wire electrically connected with the first leading wire at a first position of the first test wire between the first end and the second end; the display region includes first signal wires of first group extending in a second direction, two first signal wires arranged outermost in the first direction among the first signal wires of first group are respectively connected with the first end and the second end, and remaining first signal wires among the first signal wires of first group are connected with the first leading wire between the first end and the second end.