Shielding Pattern for Display Device Pinhole Shorts
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Solution Overview
Problem
Liquid crystal displays face issues with shorts generated by pinholes during the manufacturing process, which affect the reliability and stability of the display device.
Innovation Solution
Incorporating a shielding pattern part made of transparent conductive oxide (TCO) on the same layer as the pixel electrode, overlapping the data line, which is wider than the data line and completely covers it, preventing shorts between the data line and the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding pattern part is added to prevent shorts caused by pinholes, then reliability is improved, but device complexity increases
Solution Approach 1:
The shielding pattern part is merged with the pixel electrode layer, both being formed on the same substrate at the same layer. This integration approach prevents shorts while avoiding the need for separate shielding structures, thus improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The shielding pattern part serves multiple functions: it acts as both a shielding structure to prevent shorts and maintains the electrical characteristics of the pixel electrode. By making the shielding pattern part transparent and conductive, it simultaneously provides electrical connection and short prevention, reducing the need for additional components.
2Reliability
If the shielding pattern part is made wider to completely cover the data line, then reliability is improved, but aperture ratio deteriorates
Solution Approach 1:
The shielding pattern part is designed with non-uniform width, being wider only in the specific region where it overlaps with the data line to prevent shorts, while maintaining appropriate width in other regions. This localized expansion approach ensures short prevention at critical interfaces without unnecessarily reducing the overall aperture ratio of the display device.
Data Source
AI summary
A display device includes a first insulation substrate, a gate line disposed on the first insulation substrate, a semiconductor layer disposed on the gate line, a data line insulated from and crossing the gate line and including a source electrode and a drain electrode facing the source electrode, a first insulating layer disposed on the source electrode and the drain electrode, a pixel electrode electrically connected to the drain electrode, a second insulating layer disposed on the pixel electrode, a common electrode disposed on the second insulating layer, and a shielding pattern part disposed on a same layer as the pixel electrode and overlapping the data line.