Array Substrate Common Electrode Isolation for LCD Overlap Shorts
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Solution Overview
Problem
Conventional array substrates for liquid crystal display panels are prone to short circuits between the common electrode and the share bar due to overlapping areas, leading to vertical dark lines and reduced light transmittance.
Innovation Solution
The array substrate design includes a common electrode with a wire insulated from its frame, allowing the share electrode to overlap the wire without electrical connection, thereby preventing short circuits and maintaining insulation from the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode includes a frame and strip connected in the frame with large overlapped area with share bar, then the common electrode structure is simple and continuous, but short circuit easily occurs between common electrode and share bar
Solution Approach 1:
The common electrode is segmented into a frame portion and a strip portion that are electrically isolated from each other. The strip is divided into multiple segments spaced apart, preventing continuous electrical connection between the frame and strip, thereby eliminating the short circuit path while maintaining structural complexity at an acceptable level.
Solution Approach 2:
An insulation layer is introduced as an intermediary between the common electrode and share bar. This insulation layer prevents direct electrical contact between overlapping conductive elements, resolving the short circuit issue without requiring fundamental changes to the electrode geometry or layout.
2Illumination intensity
If share electrode overlaps common electrode with large area, then light transmittance is improved, but short circuit risk increases
Solution Approach 1:
The common electrode strip is segmented into multiple isolated sections with gaps between them. This allows the share electrode to overlap extensively with the common electrode structure for improved light transmittance, while the segmentation prevents continuous electrical contact, thereby maintaining reliability.
Solution Approach 2:
An insulation layer is positioned between the share electrode and common electrode in overlapping regions. This intermediary enables large-area overlap for enhanced optical performance while preventing electrical short circuits, thus resolving the contradiction between light transmittance and reliability.
3Reliability
If wire of common electrode is connected to frame, then common electrode electrical continuity is maintained, but insulation from share electrode is compromised
Solution Approach 1:
The common electrode is segmented such that the strip portion is electrically isolated from the frame portion. This segmentation breaks the continuous electrical path, ensuring that even when the share electrode overlaps with the common electrode structure, no short circuit can occur, thereby prioritizing electrical insulation over continuous power distribution.
Solution Approach 2:
An insulation layer is introduced as a mediator between the common electrode components and share electrode. This intermediary maintains electrical insulation reliability while allowing the wire and frame to be connected for power distribution, as the insulation layer prevents any unintended electrical contact with overlapping elements.
Data Source
AI summary
An array substrate, a manufacturing method thereof, and a display panel are provided. In the array substrate, a first metal layer includes a common electrode, the common electrode includes a first frame and a wire disposed in the first frame, the wire and the first frame are insulated from each other and spaced apart, a second metal layer and the first metal layer are disposed in different layers, the second metal layer includes a share electrode, and the share electrode is disposed overlapping the wire.