Mini LED Display Panel Test Pad Spacing and ESD Wire Design
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Solution Overview
Problem
In the manufacturing process of display panels, the test pads occupy a large space in the lower bezel, leading to short circuits during testing due to their dense arrangement with other wires.
Innovation Solution
A display panel design with a test region located between the display region and the panel edge, featuring a plurality of test pads spaced apart by electrostatic discharge protection wires. The wires are arranged such that the distance between adjacent line segments between test pads is less than the distance between line segments adjacent to the panel edge, preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If test pads are densely arranged in the lower bezel to perform testing functions, then testing capability is improved, but short circuit risk increases due to close proximity with other wires
Solution Approach 1:
The patent introduces electrostatic discharge protection wires as intermediary elements between adjacent test pads. These protection wires act as mediators that prevent direct electrical contact between test pads and other wires, thereby eliminating the short circuit risk while preserving the dense arrangement of test pads for comprehensive testing capability
Solution Approach 2:
The patent extracts the electrostatic discharge protection function from the test pad structure itself and implements it through separate dedicated protection wires. This separation allows test pads to be densely arranged for testing purposes while the extracted protection wires provide isolation to prevent short circuits
2Reliability
If test pads are spaced apart by multiple electrostatic discharge protection wires to prevent short circuits, then reliability is improved, but space occupation in the lower bezel increases
Solution Approach 1:
The patent applies local quality by making the electrostatic discharge protection wires have different line segment densities in different regions. The first line segments between test pads are densely arranged with smaller spacing, while the second line segments near the panel edge are sparsely arranged with larger spacing. This local differentiation provides effective short circuit prevention where needed while minimizing space occupation in other areas
Solution Approach 2:
The patent employs asymmetric design in the protection wire structure, where the distance between adjacent first line segments is deliberately made less than the distance between adjacent second line segments. This asymmetric arrangement optimizes space utilization by concentrating protection where test pads require isolation while reducing protection density in areas where short circuit risk is lower
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 design reduces the risk of short circuits during testing, optimizes the arrangement of test pads on the lower bezel, and improves the reliability of display panels by effectively managing electrostatic discharge.
Implementation Method 1
At least two test pads adjacent in the first direction are spaced apart by multiple first electrostatic discharge protection wires
Data Source
AI summary
A display panel, a motherboard, and a mini LED display device. The display panel includes: a panel edge extending along a first direction, and a display region and a test region. The test region is between the display region and the panel edge and includes test pads. At least two test pads are arranged along the first direction, adjacent ones of which are spaced by at least two first electrostatic discharge protection wires extending from one side of the display region adjacent to the test region to the panel edge. Each first electrostatic discharge protection wire includes a first line segment located between two adjacent test pads and a second line segment adjacent to the panel edge. A distance between adjacent first line segments between two adjacent test pads in the first direction is less than a distance between adjacent second line segments in the first direction.