Pixel Power Line Shielding for Parasitic Capacitance Control
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Solution Overview
Problem
Parasitic capacitance between components in a pixel and a data line leads to incorrect luminance in display devices, causing defects like stains in images and deteriorated display quality.
Innovation Solution
The display device incorporates a first and second power line that overlap and shield the data line and transistor, with a capacitor connected between the transistor's gate electrode and an electrode, and multiple capacitors in parallel configuration to maintain accurate data signals and target luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power lines are added to shield the data line and transistor, then parasitic capacitance effects are reduced and display quality is improved, but device complexity increases
Solution Approach 1:
Power lines are introduced as intermediary elements between the data line and the transistor to shield the data line from parasitic capacitance effects. The power lines act as a mediator that blocks the harmful capacitive coupling while maintaining electrical connectivity, thereby improving display quality without fundamentally changing the pixel structure
Solution Approach 2:
The power lines are configured to maintain constant voltage levels that create equipotential regions, reducing the voltage differential that causes parasitic capacitance effects. By keeping the power lines at stable potentials, the harmful capacitive coupling between the data line and transistor is minimized
2Reliability
If multiple power lines are used to shield the data line, then parasitic capacitance is reduced, but manufacturing complexity increases
Solution Approach 1:
The shielding function is divided into multiple segments with different power lines positioned at various locations around the data line and transistor. Each power line segment contributes to the overall shielding effect, allowing the manufacturing process to use standard layered deposition techniques rather than requiring complex single-step structures
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
The solution effectively shields the data line and transistor, ensuring accurate data signal maintenance and improved display quality by preventing parasitic capacitance effects.
Implementation Method 1
the first power line may extend in a first direction intersecting the second direction and overlap the data line and the gate electrode of the first transistor, and the second power line may extend in the second direction, overlap the data line, and overlap the gate electrode of the first transistor
Data Source
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AI summary
A display device comprises a pixel. The pixel is electrically connected to a first power line, a second power line, and a data line. The pixel comprises: a first transistor; and a capacitor electrically connected between a gate electrode of the first transistor and one electrode of the first transistor. In a plan view, the data line extends in a second direction. The first power line extends in a first direction crossing the second direction and overlaps the data line and the gate electrode of the first transistor. The second power line extends in the second direction, overlaps the data line, and overlaps the gate electrode of the first transistor.