Dummy Wires for Display Device Wire Defect Inspection
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Solution Overview
Problem
High-resolution display devices with thinner wires are prone to line width thinning and breakage due to drive current stress, necessitating effective inspection methods to prevent reliability deterioration.
Innovation Solution
Incorporation of dummy wires parallel to and outside the main wires, not coupled to driver terminals, allowing for imaging-based inspection to detect semi-broken or thinned wire sections, complemented by aging treatment for signal and connection line inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of wires is increased and wire thickness is reduced to achieve higher resolution, then display resolution is improved, but wire reliability deteriorates due to locally thinned line width and breakage from drive current stress
Solution Approach 1:
The patent applies preliminary action by introducing dummy wires that extend beyond the pixel array boundaries before the actual display operation begins. These dummy wires are positioned to detect potential breakage points before they affect the functional display wires, allowing preventive detection of reliability issues before they manifest in the actual display system.
Solution Approach 2:
The dummy wires serve as an intermediary detection system between the drive current source and the functional display wires. They act as a buffer zone that can absorb or indicate stress effects before they reach the critical display wires, enabling indirect monitoring of wire health without interfering with the primary display function.
2Device complexity
If traditional inspection methods are used without dummy wires, then device complexity is reduced, but detection precision of wire defects deteriorates
Solution Approach 1:
The patent uses copying by creating dummy wires that replicate the structure, material composition, and electrical characteristics of the functional display wires. These copied wire structures allow inspection of wire integrity without requiring complex inspection equipment, as the dummy wires can be monitored through simpler means while providing the same detection capability.
Data Source
AI summary
A display device includes wires that are coupled to driver terminals that are able to be coupled to a driver integrated circuit (IC) and that are provided along a first direction and extending so as to spread toward outsides in the first direction as the wires are directed toward a second direction orthogonal to the first direction; and dummy wires that are provided along the wires on one outside and another outside in the first direction of the wires and that are not coupled to the driver terminals and the wires, wherein a number of the dummy wires on the one outside and a number of the dummy wires on the other outside are respectively three or more, the dummy wires extend in parallel with the wires, and a width of the dummy wire is equal to a width of the wire.