Display Scan Line Shield Pattern for Coupling Noise Isolation
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Solution Overview
Problem
Coupling noise occurs between wiring lines in display devices, degrading image clarity and performance, particularly in high-resolution displays.
Innovation Solution
Implementing a shield pattern that overlaps both the second drain electrode pattern and the scan line, electrically charged with a constant voltage to act as a barrier and reduce unwanted electrical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wiring lines are placed close together to reduce device area, then area is reduced, but coupling noise increases
Solution Approach 1:
A shield pattern is introduced as an intermediary conductive structure between the scan line and drain electrode pattern. This shield pattern acts as a mediator that blocks electromagnetic coupling between the two wiring lines, thereby reducing coupling noise while allowing them to be placed close together for area efficiency.
Solution Approach 2:
The shield pattern is implemented as a thin conductive film or layer that is deposited between the scan line and drain electrode pattern. This thin film structure provides effective electromagnetic shielding without adding significant thickness or area to the device, enabling close spacing of wiring lines while maintaining noise isolation.
2Object-affected harmful factors
If shield pattern is added to reduce coupling noise, then coupling noise is reduced, but device complexity increases
Solution Approach 1:
The shield pattern is merged with existing device structures such as being integrated into the same layer as other conductive elements or being combined with grounding structures already present in the display device. This merging approach reduces the need for separate additional components and simplifies the overall manufacturing process.
Solution Approach 2:
The shield pattern serves multiple functions: it provides electromagnetic shielding between scan lines and drain electrodes, acts as an additional grounding reference, and can be used as a via structure for inter-layer connections. This multi-functionality reduces the need for separate dedicated shielding structures, thereby reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces coupling noise, improving image quality and signal integrity, leading to enhanced display performance.
Implementation Method 1
a shield pattern overlapping the vertical line... electrically charged with a constant voltage to act as a barrier and reduce unwanted electrical coupling
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A display device includes a base layer including a display area in which a plurality of pixels is disposed and a non-display area disposed adjacent to the display area, a gate driver disposed in the non-display area and configured to output a write scan signal, a scan line, and a shield pattern. The scan line includes a vertical line extending from the gate driver in a first direction and configured to apply the write scan signal to the plurality of pixels, and a horizontal line extending in a second direction crossing the first direction and electrically connected to the vertical line. The shield pattern overlaps the vertical line.