Liquid Crystal Panel Wire Segmentation for Aperture Ratio
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Solution Overview
Problem
Liquid crystal display devices face issues with line defects such as disconnection and short-circuits, leading to decreased yield and quality, particularly due to thin design of source lines and inter-layer insulating films, which can cause insulation short-circuits and alignment defects.
Innovation Solution
A liquid crystal panel design featuring a first substrate with multiple wires, a second wire intersecting these, and a third wire in a different layer, with apertures at intersection points and contact holes connecting the wires, to prevent line defects and enhance pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If source lines are designed as thin lines to secure aperture ratio, then aperture ratio is improved, but disconnection of source lines occurs more frequently
Solution Approach 1:
The source line is divided into multiple segments: a lower-layer source line and an upper-layer source line, connected via contact holes. This segmentation allows each line to be thinner while the combined structure maintains reliability, resolving the contradiction between thin line design and connection reliability.
Solution Approach 2:
The source line connection problem is solved by transitioning from a single-layer to a multi-layer structure. The upper-layer source line is positioned above the lower-layer source line, connected through contact holes, effectively adding a vertical dimension to the wire routing to improve reliability without reducing aperture ratio.
2Manufacturing precision
If inter-layer insulating film is designed as thin film to achieve constant TFT characteristics, then TFT characteristics are improved, but insulation short-circuit between layers occurs easily
Solution Approach 1:
The insulating structure is segmented into multiple layers: a first inter-layer insulating film and a second inter-layer insulating film. This segmentation allows the first film to remain thin for TFT characteristic uniformity while the second film provides additional insulation to prevent short-circuits.
Solution Approach 2:
The second inter-layer insulating film is introduced as a preventive measure to cushion against potential short-circuits between the gate line and upper-layer source line, addressing the insulation reliability issue before it occurs.
3Reliability
If contact hole is formed near pixel aperture to connect wires, then wire connection reliability is improved, but display defects and alignment defects occur
Solution Approach 1:
The contact holes are formed in the gate line aperture regions, utilizing the vertical space above the gate line rather than encroaching on the pixel aperture. This dimensional repositioning maintains wire connection reliability while avoiding display and alignment defects.
4Reliability
If redundant data line is formed on upper layer with contact hole connection, then line defect tolerance is improved, but manufacturing complexity increases
Solution Approach 1:
The upper-layer source line serves dual functions: it acts as a redundant connection path for reliability and simultaneously functions as a signal transmission line. This multi-functionality reduces the need for separate redundant structures, lowering manufacturing complexity.
Data Source
AI summary
A liquid crystal panel includes a first substrate and a second substrate. The first substrate includes a plurality of first wires, a second wire that intersects with the plurality of first wires, and a third wire that is arranged in a layer different from a layer in which the second wire is arranged and that is arranged in parallel to the second wire. An aperture is formed in at least any of all intersection portions in which the plurality of first wires and the second wire intersect. The second wire and the third wire are connected through a contact hole that is formed in the aperture.