Array Substrate Layer Structure for Fine LCD Signal Lines
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high definition and improved moving image display capabilities due to low adherence between semiconductor layers and transparent conductive materials, leading to conduction failures and difficulties in manufacturing fine signal lines and pedestals.
Innovation Solution
The implementation of a semiconductor layer, scanning line, signal line, pedestal, and pixel electrode configuration, where the signal line and pedestal are formed in different layers with good adherence, allowing for indirect connection through a pedestal made of metal, thereby preventing conduction failures and enabling finer sub-pixel formation without requiring extreme processing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of the signal line is increased to prevent video signal delay, then the moving image display capability is improved, but the manufacturing precision required for patterning the base layer increases significantly
Solution Approach 1:
The patent transitions from planar patterning to three-dimensional stacked structure. By forming the signal line and pedestal in different layers (different dimensions), the system achieves thick signal lines for low resistance without requiring ultra-fine patterning of the base layer. The base layer can be patterned at a relaxed pitch while the vertical stacking provides the necessary electrical performance.
Solution Approach 2:
The patent divides the electrical connection path into segmented components across multiple layers. The signal line is separated from the pedestal by placing them in different stacked layers, with the semiconductor layer positioned between them. This segmentation allows each component to be optimized independently - the signal line can be thick for low resistance while the base layer patterning remains at manageable precision levels.
2Reliability
If a metallic pedestal is used to improve adherence between semiconductor layer and pixel electrode, then conduction reliability is improved, but the device complexity increases due to additional layer structure
Solution Approach 1:
The base layer serves multiple functions simultaneously: it provides mechanical support as a structural layer, enables electrical connection through the stacked configuration, and facilitates low-resistance current flow through the thick signal line. This multi-functionality reduces the need for separate dedicated components, thereby managing complexity while achieving reliable conduction.
Solution Approach 2:
The semiconductor layer acts as an intermediary element positioned between the signal line and pedestal in the stacked structure. This intermediary configuration enables good adherence and electrical connection without requiring direct contact between incompatible materials, thereby improving conduction reliability while maintaining a manageable structural complexity through systematic layering.
Data Source
AI summary
According to one embodiment an array substrate includes a semiconductor layer scanning and signal lines first and second insulating layers a pedestal and a pixel electrode. The scanning line is opposed to the semiconductor layer. The first insulating layer is provided above the semiconductor layer. The signal line and the pedestal are connected to the semiconductor layer through first and second contact holes in the first insulating layer. The second insulating layer is provided above the pedestal. The pixel electrode is connected to the pedestal through a third contact hole in the second insulating layer. The signal line and the pedestal are provided in layers different from each other.