Segmented Data Line and Overlapping Storage Electrode in Display Devices
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Solution Overview
Problem
Existing display devices face challenges in achieving high reliability, high aperture ratio, and reducing process failure, particularly in the fabrication of thin film transistor substrates used in display panels.
Innovation Solution
The solution involves a display device design with a gate line, data line, semiconductor pattern, drain electrode, source electrode, and storage electrode configuration, where the data line has spaced segments connected by a drain electrode and the storage electrode overlaps with the data line, along with a specific fabrication method that includes forming these elements on a substrate to minimize parasitic capacitance and enhance aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the data line is configured as a single continuous segment, then the fabrication process is simpler, but parasitic capacitance increases and aperture ratio decreases
Solution Approach 1:
The data line is divided into multiple segments (first data line segment and second data line segment) that are spaced apart from each other. This segmentation reduces parasitic capacitance between the data line and gate line, thereby improving display performance and aperture ratio while maintaining acceptable fabrication complexity.
2Reliability
If the storage electrode is positioned away from the data line, then interference is reduced, but parasitic capacitance increases
Solution Approach 1:
The storage electrode is positioned to overlap with the data line in the vertical dimension (through the dielectric layer) rather than being adjacent in the horizontal plane. This spatial arrangement in another dimension allows the storage electrode to be closely coupled to the data line for capacitance formation while avoiding horizontal interference and parasitic capacitance issues.
3Area of stationary object
If the aperture ratio is increased, then display brightness improves, but manufacturing precision requirements increase
Solution Approach 1:
By segmenting the data line and positioning it away from the gate line, the design allows for larger pixel openings without increasing the complexity of interconnect structures. This enables higher aperture ratios while maintaining reasonable manufacturing precision requirements through simplified fabrication processes.
Data Source
AI summary
Provided is a display device that includes: a gate line disposed on a substrate, the gate line including a protruding gate electrode; a data line extending across the gate line, the data line having first and second segments spaced apart from each other; a semiconductor pattern overlapping with the gate electrode; a drain electrode that contacts a drain region of the semiconductor pattern and connects the first and second segments; a source electrode that contacts a source region of the semiconductor pattern; and a storage electrode overlapping with the data line.