Display Panel Pad Layout with Dummy Pads for ESD Isolation
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Solution Overview
Problem
As the resolution of display panels increases, the gap between signal lines narrows, leading to a higher chance of defects such as burnt or short circuits due to adjacent signal characteristics, which affects the stability of driving signals and can cause pad defects.
Innovation Solution
A lightweight display panel design that includes a dummy pad between adjacent pads with large potential differences and an electrostatic discharge unit, featuring a clock pad, a first power line pad, an electrostatic discharge high-potential voltage pad, and an electrostatic discharge low-potential voltage pad, to stabilize operation and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased, then the image quality is improved, but the gap between signal lines narrows causing pad defects and unstable operation
Solution Approach 1:
A dummy pad is introduced as an intermediary element between adjacent signal pads that have large potential differences. This dummy pad acts as a buffer zone that prevents direct harmful interactions between adjacent signals, thereby reducing pad defects while maintaining high resolution
Solution Approach 2:
The pad arrangement is segmented by inserting additional dummy pads between adjacent functional pads. This segmentation creates isolated zones for different signal types, preventing interference and improving reliability without compromising the overall resolution
2Productivity
If the gap between signal lines is narrowed to increase resolution, then more signal lines can be accommodated, but the chance of burnt or short circuit defects increases
Solution Approach 1:
The dummy pad serves as a protective intermediary between adjacent high-density signal lines, preventing direct contact and harmful interactions that would cause burnt or short circuit defects, thereby enabling higher signal line density
Solution Approach 2:
The dummy pad is positioned in advance between adjacent signal lines to provide a cushioning effect that prevents potential defects before they occur, allowing the signal lines to be placed closer together without increasing defect risk
3Area of stationary object
If adjacent pads with large potential differences are placed close together, then the device size is reduced, but the risk of electrostatic discharge and pad defects increases
Solution Approach 1:
A dummy pad is inserted as a buffer between adjacent pads with large potential differences, providing electrostatic discharge protection while maintaining compact device area
Solution Approach 2:
The dummy pad converts the potentially harmful electrostatic discharge risk into a beneficial protective mechanism by providing a controlled discharge path and isolation barrier between high-potential and low-potential pads
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 pad defects and enables stable operation at low power by mitigating the effects of adjacent signal characteristics and potential differences, enhancing the reliability of the display panel.
Implementation Method 1
an electrostatic discharge unit disposed in the non-display area, and a plurality of pads disposed in the non-display area and coupled with a plurality of signal lines electrically connected to the gate driving circuit and the electrostatic discharge unit
Data Source
AI summary
A display panel and a display device are disclosed and, more specifically, the display panel includes a substrate including a display area where a plurality of subpixels are disposed, a gate driving circuit disposed in a non-display area outside the display area to supply a plurality of scan signals to the plurality of subpixels, an electrostatic discharge unit disposed in the non-display area, and a plurality of pads disposed in the non-display area and coupled with a plurality of signal lines electrically connected to the gate driving circuit and the electrostatic discharge unit, wherein the plurality of pads include, as sequentially disposed, a clock pad connected with a clock signal line, a first line pad connected with a first power line, an additional pad connected with an electrostatic discharge high-potential voltage line and an electrostatic discharge low-potential voltage line, and a second line pad connected with a second power line.