Array Substrate Probe Access Using Discharge Layers
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Solution Overview
Problem
The existing method of using probes to obtain signals in the circuit of an array substrate requires high force to puncture the insulating layer, which can damage the circuit, or insufficient force that fails to penetrate, posing challenges in analyzing display device anomalies.
Innovation Solution
The array substrate design includes a carrier substrate with a first and second signal line connected through a through hole, a thin film transistor, and discharge layers connected via through holes, allowing signals to be obtained by contacting the discharge layer without puncturing the insulating layer, facilitating convenient signal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the probe applies high force to puncture the insulating layer, then the probe can contact the circuit to obtain signals, but the circuit may be damaged
Solution Approach 1:
The patent introduces a discharge layer as an intermediary between the insulating layer and the circuit. The discharge layer is designed to be punctured by the probe instead of the insulating layer, while the insulating layer remains intact to protect the circuit. This mediator absorbs the mechanical stress of probe insertion and provides a safe contact point for signal acquisition without transmitting damaging forces to the underlying circuit.
Solution Approach 2:
The patent segments the protective and contact functions into separate layers: the insulating layer maintains circuit protection, while the discharge layer provides the probe contact interface. This segmentation allows each layer to perform its specific function optimally - the insulating layer prevents accidental contact and damage, while the discharge layer enables controlled signal access through probe puncture.
2Object-affected harmful factors
If the probe applies insufficient force, then the circuit is protected from damage, but the probe cannot puncture the insulating layer to obtain signals
Solution Approach 1:
The discharge layer is designed with locally differentiated properties - it has regions that are easier to puncture than the insulating layer while maintaining overall protective coverage. The layer's material composition and thickness are optimized to allow probe penetration with minimal force at specific contact points, while other areas maintain higher protective integrity. This local quality variation enables signal acquisition without requiring high probe force that could damage the circuit.
3Object-affected harmful factors
If the insulating layer is made thicker to better protect the circuit, then circuit protection is improved, but the probe requires even higher force to puncture it
Solution Approach 1:
The discharge layer serves as a mediator that decouples the relationship between insulating layer thickness and probe puncture force. By providing an alternative puncture target with lower mechanical strength, the discharge layer allows probes to access signals without needing to overcome the high force requirements of thicker insulating layers, thereby maintaining circuit protection while reducing probe force requirements.
Data Source
AI summary
The array substrate includes a carrier substrate, a first signal line, a thin film transistor, a first insulating layer covering the first signal line and provides with a first through hole, a second signal line located on a surface of the first insulating layer and is connected to the first signal line through the first through hole, a second insulating layer covering the thin film transistor and the second signal line, a first discharge layer located on the surface of the second insulating layer and is connected to at least one of the first signal line and the second signal line, a third insulating layer covering the first discharge layer, and the second discharge layer located on the surface of the third insulating layer and is connected to the first discharge layer.