Display Output Pad Layout With Individual Pad for Corrosion Prevention
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Solution Overview
Problem
Corrosion phenomena occur in pads of a driving circuit due to potential differences, leading to increased resistance, disconnections, and short circuits, which deteriorate the reliability of display devices.
Innovation Solution
A display device with a display panel and driving circuit that includes output pads, detection pads, and an individual pad to generate an individual signal by analyzing the waveforms of first and second driving signals, managing potential differences and reducing corrosion risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple output pads are used to transfer driving signals, then signal transfer capability is improved, but potential differences between pads cause corrosion phenomena
Solution Approach 1:
An individual pad is introduced as an intermediary element disposed between multiple output pads. This individual pad receives an individual signal from the driving circuit and establishes a reference potential that mediates the potential differences between adjacent output pads, thereby preventing corrosion while maintaining signal transfer capability
Solution Approach 2:
The individual pad is configured to maintain a constant potential relative to adjacent output pads by receiving a dedicated individual signal. This creates equipotential conditions between pads that would otherwise have potential differences, eliminating the corrosion mechanism while preserving the multiple-pad signal transfer architecture
2Measurement precision
If detection pads are added to sense driving signals, then signal monitoring capability is improved, but device complexity increases
Solution Approach 1:
The individual pad serves multiple functions: it acts as a reference potential source to prevent corrosion, provides a sensing point for monitoring driving signals, and maintains signal transfer capability. By combining these functions in a single element, the need for separate detection pads is reduced, thereby limiting the increase in device complexity
Data Source
AI summary
A display device includes a display panel including signal lines connected to at least one pixel, at least one first output pad that transfers a first driving signal supplied to the signal lines, at least one second output pad that transfers a second driving signal supplied to the signal lines, detection pads that sense each of the first driving signal and the second driving signal, an individual pad disposed adjacent to the first output pad and the second output pad, and a driving circuit that generates an individual signal by analyzing a waveform of each of the first driving signal and the second driving signal.