LED Display Pad Layout for Static Discharge and Overcurrent Suppression
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Solution Overview
Problem
Display devices using light emitting diodes (LEDs) face issues with static electricity generation and short-circuiting, which affect reliability and can lead to burnt phenomena.
Innovation Solution
A display device structure is designed with specific pad configurations and grounding mechanisms to dissipate static electricity, including top and bottom pads with different voltage potentials and ground pads spaced apart, forming a static discharge path to prevent overcurrent flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pad structure is used in LED display devices, then the device can be manufactured with standard processes, but static electricity accumulates and causes short-circuits and burnt phenomena
Solution Approach 1:
The pad structure is segmented into multiple functional zones: first pads for high potential voltage, second pads for low potential voltage, and ground pads for static electricity dissipation. This segmentation allows each pad group to perform its specific function, preventing static electricity accumulation while maintaining proper electrical connections for LED operation.
Solution Approach 2:
Ground pads serve as an intermediary element between the signal pads and the chassis/ground system. These ground pads provide a dedicated pathway for static electricity to dissipate safely, acting as a mediator that prevents charge buildup without interfering with the signal transmission through first and second pads.
2Device complexity
If ground pads are placed close to signal pads for compact design, then the device structure is simplified, but static electricity can cause short-circuits between signal and ground
Solution Approach 1:
The pad structure is divided into distinct groups (first pads, second pads, and ground pads) with clear spatial separation. This segmentation creates isolated functional zones that prevent unintended electrical interactions while maintaining overall structural compactness through optimized arrangement.
Solution Approach 2:
Different regions of the pad structure have different properties: signal pads (first and second pads) are designed for electrical connection with specific voltage potentials, while ground pads are designed specifically for charge dissipation. This local differentiation ensures that each area performs its intended function without causing short-circuits.
3Ease of manufacture
If uniform pad configuration is used across all edges, then the manufacturing process is simplified, but static electricity cannot be effectively dissipated from specific high-risk areas
Solution Approach 1:
The pad configuration is optimized for each specific edge and location based on static electricity generation risks and signal requirements. First pads and second pads are positioned in areas requiring signal transmission, while ground pads are strategically placed in areas prone to static accumulation, ensuring effective dissipation without compromising manufacturing feasibility.
Solution Approach 2:
The pad structure utilizes both planar arrangement and vertical layering to achieve effective static electricity dissipation. Ground pads are positioned to create multiple dissipation pathways in different spatial dimensions, enhancing protection while maintaining a manufacturable design that builds upon standard fabrication processes.
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 structure effectively suppresses static electricity and overcurrent, enhancing the reliability and stability of the display device by preventing short-circuits and improving image quality.
Implementation Method 1
a plurality of ground pads which is disposed in a first edge of the first substrate and a first edge of the second substrate, wherein the plurality of top pads includes: a plurality of first pads disposed in a first pad area of the first edge of the first substrate; and a plurality of second pads disposed in a second pad area of a second edge of the first substrate
Implementation Method 2
a plurality of side lines which is disposed on a side surface of the first substrate and a side surface of the second substrate to connect the plurality of top pads and the plurality of bottom pads
Data Source
AI summary
A display device comprises top pads on a first substrate; bottom pads below a second substrate; side lines on a side surface of the first substrate and a side surface of the second substrate; and ground pads in first edges of the first substrate and the second substrate, wherein each of the top pads and the bottom pads includes: first pads in first pad areas of the first edges of the first substrate and the second substrate; and second pads in second pad areas of second edges of the first substrate and the second substrate, a high potential voltage is applied to the first pads and a low potential voltage is applied to the second pads, and the ground pads are in the first edges of the first substrate and the second substrate to be spaced apart from each other with the first pads therebetween. Therefore, overcurrent is suppressed.