Display Panel Dummy Pad Design for Moisture Corrosion Prevention
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Solution Overview
Problem
Signal wires and pads in display apparatuses are susceptible to corrosion from external moisture in high temperature and high humidity environments, leading to poor driving performance due to electrolytic corrosion at the edge of the driver IC.
Innovation Solution
Incorporation of a dummy pad in the display panel with a positive voltage applied to attract and neutralize negative charges, preventing them from reacting with the driving pads and reducing electrolytic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal wires and pads are extended from display area to non-display area for driver IC connection, then electrical connectivity is achieved, but corrosion from external moisture occurs leading to poor driving performance
Solution Approach 1:
A dummy pad is introduced as an intermediary element between the driving pad and the edge of the driver IC. This dummy pad acts as a mediator that attracts negative charges away from the driving pad, preventing direct reaction between the driving pad and corrosive moisture. The dummy pad is connected to the driving pad through a dummy signal wire, creating a protective charge distribution that shields the functional driving pad from electrolytic corrosion.
Solution Approach 2:
The dummy pad is configured to preemptively attract negative charges before they can react with the driving pad. By applying a positive voltage to the dummy pad, negative charges are drawn toward the dummy pad in advance, creating a protective effect that prevents corrosion before it occurs at the driving pad. This preliminary action of charge attraction protects the driving pad from future corrosive damage.
2Reliability
If dummy pad is added to prevent corrosion, then reliability of driving pad is improved, but device complexity increases
Solution Approach 1:
The dummy pad is designed as a simplified copy or replica of the driving pad structure. It mirrors the basic pad geometry and connection method but serves a different functional purpose (charge attraction rather than signal transmission). This copying approach allows the dummy pad to be integrated using the same manufacturing processes and materials as the driving pad, adding minimal complexity while providing substantial protective benefit.
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 prevents or delays electrolytic corrosion, improving the reliability and stability of the display apparatus by maintaining stable electrical connections.
Implementation Method 1
A positive voltage is applied to the dummy pad... to attract and neutralize negative charges, preventing them from reacting with the driving pads
Implementation Method 2
Signal wires and pads are subject to corrosion from external moisture introduced by a high temperature, high humidity operating environment. Such badness often occurs in the pad located at the edge of the driver IC, resulting in poor driving.
Data Source
AI summary
One embodiment of the present disclosure discloses a display panel including a substrate having a display area and a non-display area in the periphery of the display area, a plurality of signal wires extending from the display area to the non-display area, a plurality of driving pads that is disposed in a first area, to which a driver IC is attached in the non-display area and the is connected to the plurality of signal wires, and a dummy pad disposed in the first area, wherein a positive voltage is applied to the dummy pad, and a display apparatus including the same.