Bezel ESD Circuit Encapsulation for Moisture-Resistant Displays
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Solution Overview
Problem
Display apparatuses are vulnerable to damage from static electricity, which can cause electrolytic corrosion and degrade electro-static discharge circuits due to moisture and oxygen exposure.
Innovation Solution
The display apparatus incorporates a structure with an organic insulating layer on the device substrate, multiple inorganic insulating layers, and an electro-static discharge circuit on the bezel area, featuring ESD transistors with specific electrode configurations and voltage wirings to prevent damage and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electro-static discharge circuit is disposed on the bezel area, then the light-emitting device and driving circuit are protected from static electricity damage, but the electro-static discharge circuit itself becomes vulnerable to damage from moisture and oxygen
Solution Approach 1:
The patent applies the inert atmosphere principle by creating a sealed encapsulation environment around the electro-static discharge circuit on the bezel area. The encapsulation structure isolates the ESD circuit from the external environment, preventing moisture and oxygen from reaching the circuit components, thereby protecting them while maintaining their static electricity discharge functionality.
Solution Approach 2:
The patent uses thin film encapsulation layers to cover the electro-static discharge circuit on the bezel area. These thin film structures provide a protective barrier that prevents moisture and oxygen penetration while allowing the ESD circuit to function properly. The encapsulation includes multiple layers that extend over the ESD circuit components, creating a hermetic seal.
2Reliability
If the electro-static discharge circuit is disposed on the bezel area, then static electricity protection is achieved, but electrolytic corrosion reaction occurs on the electrodes
Solution Approach 1:
The encapsulation structure creates an inert environment around the ESD circuit electrodes, preventing moisture and oxygen from contacting the electrode surfaces. This eliminates the conditions necessary for electrolytic corrosion while preserving the electrostatic discharge functionality of the circuit.
Solution Approach 2:
The patent introduces an intermediary encapsulation layer between the ESD circuit electrodes and the external environment. This intermediary barrier prevents direct contact between moisture/oxygen and the electrodes, thereby suppressing electrolytic corrosion reactions while allowing the ESD circuit to perform its protective function.
3Object-affected harmful factors
If multiple inorganic insulating layers are used to protect the ESD circuit, then moisture and oxygen protection is improved, but the device structure becomes more complex
Solution Approach 1:
The patent divides the encapsulation structure into multiple segmented inorganic insulating layers, each serving specific protective functions. This segmentation allows for targeted protection of different areas of the ESD circuit while maintaining overall structural integrity and managing complexity through modular design.
Solution Approach 2:
The patent employs composite material structures by combining multiple inorganic insulating layers with different properties. Each layer provides specific protective characteristics (such as moisture barrier, oxygen barrier, or mechanical strength), and their combination creates a synergistic effect that enhances overall protection while distributing the complexity across functional layers.
Data Source
AI summary
A display apparatus includes a device substrate having a display area and a bezel area with an organic insulating layer disposed on the display area of the device substrate, and a plurality of inorganic insulating layers disposed between the device substrate and the organic insulating layer. The plurality of inorganic insulating layers, as well as a plurality of signal wirings, extend from the display area to on the bezel area of the device substrate. Also, an electro-static discharge (ESD) circuit is disposed on the bezel area, the electro-static discharge circuit including a first ESD transistor electrically connected to a second ESD transistor and a signal wiring of the plurality of signal wirings with the ESD circuit preventing damage in pixel area due to a static electricity.