Display Panel Power Pad Layout for Electrostatic Discharge Protection
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Solution Overview
Problem
Organic light emitting display devices are susceptible to damage from static electricity introduced through signal lines or pads, as existing technologies lack effective electrostatic discharge protection mechanisms.
Innovation Solution
Incorporating a display device with a circuit board featuring electrostatic discharge protection circuits, including transient voltage suppressor diodes, connected between substrate pads and ground patterns, to discharge static electricity to a power voltage lower than ground voltage, thereby protecting the device from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic discharge protection circuits are added to the circuit board, then the electrostatic discharge protection function is improved, but the device complexity increases
Solution Approach 1:
The patent introduces electrostatic discharge protection circuits as intermediary components between the signal lines/pads and the display panel circuitry. These protection circuits act as mediators that intercept and divert static electricity away from sensitive components, thereby improving reliability while maintaining a manageable device structure through functional segmentation.
Solution Approach 2:
The circuit board is segmented into functional zones: normal signal transmission paths and dedicated electrostatic discharge protection paths. The protection circuits are implemented as separate, modular components that can be independently configured and maintained, reducing overall system complexity while enhancing protection capabilities.
2Object-affected harmful factors
If transient voltage suppressor diodes are used to discharge static electricity, then the harmful effects of static electricity are reduced, but the device complexity increases
Solution Approach 1:
The patent employs transient voltage suppressor diodes that actively utilize the static electricity energy rather than merely blocking it. When static electricity is detected, these diodes create a controlled discharge path that converts the harmful voltage spike into a safe, controlled current flow to ground, thereby transforming the harmful factor into a manageable electrical event that protects sensitive components.
3Reliability
If multiple electrostatic discharge protection circuits are implemented, then the electrostatic discharge protection function is improved, but the manufacturing complexity increases
Solution Approach 1:
The electrostatic discharge protection circuits are designed with universal characteristics that allow them to be integrated into standard circuit board manufacturing processes. The protection circuits can serve multiple functions: protecting against static electricity, providing voltage regulation, and offering over-current protection, thereby reducing the need for additional specialized components and simplifying the overall manufacturing process.
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 solution effectively discharges static electricity and enhances the dispersion of electrostatic energy, improving the electrostatic discharge protection function compared to previous technologies, thus safeguarding the display device from static-related damage.
Implementation Method 1
a first electrostatic discharge protection circuit connected between the first substrate pad and the second substrate pad
Implementation Method 2
When static electricity is introduced into the signal lines or the pads through which the power source voltage and the driving signal are transmitted, circuit elements in the organic light emitting display device may face the risk of being damaged
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a first panel pad, and a second panel pad and a circuit board including a first substrate pad and a second substrate pad to apply a first power voltage to the first panel pad and the second panel. The display panel further includes a first power line pattern connected to the second substrate pad to apply the first power voltage to the pixels and a second power line pattern connected to the first substrate pad. The circuit board includes a first electrostatic discharge protection circuit connected between the first substrate pad and the second substrate pad, a substrate power pattern electrically connected to the first substrate pad, a ground pattern receiving a ground voltage, and a second electrostatic discharge protection circuit connected between the substrate power pattern and the ground pattern.