Drive Substrate Pad Layout for Micro LED Electrostatic Discharge
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Solution Overview
Problem
Micro LED display devices face electrostatic breakdown issues during the transfer of light-emitting elements to the drive substrate due to accumulated electrostatic charges, which can damage both the substrate and the elements, especially since they are made of insulating materials and have limited charge dissipation.
Innovation Solution
The drive substrate incorporates an electrostatic protection line with toothed tips on either side of the pads, allowing for tip-discharging of accumulated charges to neutralize them, preventing electrostatic breakdown by connecting the charges to a ground terminal or signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive substrate and light-emitting elements are made of insulating materials, then the electrical insulation performance is improved, but electrostatic charges accumulate and cause electrostatic breakdown
Solution Approach 1:
The patent introduces an electrostatic protection line as an intermediary component between the first pad and second pad. This protection line provides a dedicated discharge path for electrostatic charges, allowing the insulating substrate to maintain its electrical insulation performance while preventing electrostatic breakdown through the intermediary discharge mechanism
Solution Approach 2:
The patent converts the harmful accumulated electrostatic charges into a beneficial discharge process. By designing the electrostatic protection line with toothed tips facing the pads, the charges that would otherwise cause breakdown are redirected to discharge through controlled tip-discharging, transforming the harmful electrostatic accumulation into a protective mechanism
2Productivity
If light-emitting elements are transferred continuously to the drive substrate, then the manufacturing efficiency is improved, but electrostatic charges are generated constantly and accumulate
Solution Approach 1:
The patent implements continuous electrostatic charge discharge through the electrostatic protection line during the continuous transfer process. The toothed tip structure enables ongoing tip-discharging action that matches the continuous manufacturing process, ensuring charges are neutralized in real-time without interrupting the high-speed transfer operation
Solution Approach 2:
The electrostatic protection line with toothed tips facing the pads creates a self-discharging mechanism. The structure automatically neutralizes accumulated charges through tip-discharging without requiring external intervention, allowing the system to self-regulate electrostatic accumulation during continuous manufacturing
3Reliability
If the electrostatic protection line is arranged close to the pads, then the protection effect is improved, but the risk of electrostatic discharge affecting the pixel driving circuit layer increases
Solution Approach 1:
The patent applies local quality by creating asymmetric toothed tip structures where the first toothed tip faces the electrostatic protection line while the second toothed tip faces away from the pixel driving circuit layer. This localized geometric differentiation directs the electrostatic discharge path toward the protection line while shielding the sensitive circuit layer, achieving both close proximity protection and circuit safety
Solution Approach 2:
The patent employs asymmetry in the toothed tip configuration of the electrostatic protection line. The unequal positioning of toothed tips creates an asymmetric electric field distribution that channels discharge preferentially toward the protection line rather than the circuit layer, resolving the contradiction between protection effectiveness and circuit safety
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 solution effectively neutralizes electrostatic charges in real-time, preventing damage to the drive substrate and light-emitting elements during transfer and operation, enhancing the reliability and yield of micro LED display panels.
Implementation Method 1
The drive substrate incorporates an electrostatic protection line with toothed tips on either side of the pads, allowing for tip-discharging of accumulated charges to neutralize them
Data Source
AI summary
The present application provides a drive substrate and a display panel. The drive substrate includes: a substrate; a pixel driving circuit layer, arranged on the substrate; a first pad and a second pad spaced apart from the first pad, arranged on a side of the pixel driving circuit layer away from the substrate, and electrically connected to the pixel driving circuit layer. The drive substrate further includes an electrostatic protection line, the electrostatic protection line is spaced from the first pad, a side of the first pad facing the electrostatic protection line is arranged with a first toothed tip, and a side of the electrostatic protection line facing the first pad is arranged with a second toothed tip.