Crank Wire Structure for Narrow LCD Frame Reliability
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Solution Overview
Problem
In liquid crystal display devices, the thinning of wires in the non-display area to reduce the frame width increases the likelihood of disconnection, leading to potential line defects and decreased display quality, especially when etching processes are involved.
Innovation Solution
The implementation of crank portions with recesses and protrusions at the intersecting points of wires in the non-display area, which extend the etchant infiltration path and reduce the risk of disconnection by maintaining a consistent wire resistance and minimizing parasitic capacity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the width of the non-display area is decreased to achieve a narrower frame, then the frame width is reduced, but the wires in the non-display area become thinner and more prone to disconnection
Solution Approach 1:
The patent applies curvature by forming crank portions (protrusions and recesses) at the intersecting portions of wires in the non-display area. These curved structures increase the etchant infiltration path length, preventing complete etching of the wire even when the wire thickness is reduced. This allows the frame width to be narrowed while maintaining wire connection reliability through the protective effect of the curved geometry at intersection points.
2Length of moving object
If the wire thickness is reduced to decrease the non-display area width, then the frame becomes narrower, but the likelihood of disconnection increases
Solution Approach 1:
The crank portions with protrusions and recesses create a curved path that the etchant must follow, effectively increasing the etching distance. This curvature-based design protects thinner wires from complete etching, allowing reduced wire thickness while maintaining connection reliability.
Solution Approach 2:
The patent introduces a dimensional change by adding protrusions and recesses that extend in the wire extending direction, transforming a simple linear wire structure into one with additional dimensional complexity. This increases the etchant infiltration path without significantly increasing the overall wire thickness, thereby maintaining reliability while allowing thinner wires.
3Ease of manufacture
If etching is performed on the second wire at the intersecting portion, then the second wire is patterned, but the etchant may infiltrate along the side edge of the first wire and etch the second wire throughout its width causing disconnection
Solution Approach 1:
The crank portions create a curved etching path that lengthens the distance the etchant must travel to penetrate through the wire. This curvature-based protection allows standard wet etching processes to be used while preventing the etchant from completely penetrating the wire, thus maintaining connection reliability during the patterning process.
Solution Approach 2:
The crank portions act as an intermediary structure between the etchant and the wire body. The protrusions and recesses create a tortuous path that mediates the etching process, allowing controlled etching for patterning while preventing complete penetration that would cause disconnection.
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 configuration effectively prevents disconnection of wires in the non-display area, ensuring high display quality and allowing for a narrower frame design without compromising the electrical integrity of the display area.
Implementation Method 1
an etchant used for etching the second wire may infiltrate the intersecting portion of the second wire (overlying portion) from the outside along the side edge of the first wire
Data Source
AI summary
A liquid crystal display device (display device) 10 according to the present invention is provided with a display area AA that displays an image, and a non-display area NAA surrounding the display area AA. The non-display area NAA includes at least a backup wire 32 as a first wire and a source wire 24 as a second wire arranged on an upper side with respect to the backup wire 32 and intersecting with the backup wire 32. The backup wire 32 includes an intersecting portion 32CP intersecting with the source wire 24. The intersecting portion 32CP includes a crank portion 35 cranked at a side edge of the intersecting portion 32CP a second wire extending direction in which the source wire 24 extends.