Display Pad Layout With Individual Signal Control Against Corrosion
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Solution Overview
Problem
Corrosion phenomena in the pads of a driving circuit of a display device due to potential differences between adjacent pads, leading to increased resistance, disconnections, and short circuits, which deteriorate the reliability of the display device.
Innovation Solution
A display device with a display panel having output pads for first and second driving signals, detection pads to sense these signals, and an individual pad adjacent to the output pads, where a driving circuit generates an individual signal by analyzing the waveforms of both driving signals to manage potential differences, reducing the risk of corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple output pads are used to transfer driving signals, then signal transmission capability is improved, but potential differences between adjacent pads cause corrosion phenomena
Solution Approach 1:
An individual pad is introduced as an intermediary element disposed between adjacent output pads. This individual pad acts as a mediator to manage potential differences between the output pads, preventing direct galvanic interaction that causes corrosion. The individual pad receives an individually controlled signal that can be adjusted to balance potential differences, thereby protecting the adjacent output pads from corrosion while maintaining signal transmission functionality.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the voltage level or signal waveform of the individual pad based on the potential differences detected between adjacent output pads. By changing the electrical parameters (voltage, current, or timing) of the individual pad signal, the system optimizes corrosion protection while maintaining proper signal transmission through the output pads.
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 corrosion protection element by managing potential differences, and simultaneously functions as a sensing element that can detect signal characteristics. By making the individual pad multi-functional, the patent reduces the need for separate dedicated sensing pads, thereby improving signal monitoring capability while minimizing the increase in device complexity.
3Reliability
If individual signal control is implemented, then corrosion management is improved, but driving circuit complexity increases
Solution Approach 1:
The driving circuit implements feedback control by monitoring the potential differences between adjacent output pads and dynamically adjusting the signal applied to the individual pad accordingly. This feedback mechanism enables automatic corrosion management without requiring complex manual intervention or overly sophisticated circuitry. The system continuously adapts the individual pad signal parameters based on real-time conditions, achieving reliable corrosion protection with moderate circuit 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.