Display Panel Pixel Circuit Node Voltage Stability
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Solution Overview
Problem
In display devices, the pixel circuit experiences unstable node voltage when driving a light-emitting element, which affects image display quality.
Innovation Solution
A display panel design incorporating a pixel circuit with a driving transistor, a first transistor, and a second transistor, along with a first capacitor that adjusts the gate potential of the driving transistor, alleviating instability in node voltage by optimizing the placement of signal lines and capacitors to reduce parasitic capacitance and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit is used to drive a light-emitting element, then the display device can perform image display, but the node voltage becomes unstable which affects image display quality
Solution Approach 1:
The first capacitor is pre-configured in the pixel circuit to compensate for node voltage instability before it affects the driving transistor. The capacitor is positioned and connected in advance to provide voltage stabilization during the display operation, preventing the instability issue from degrading image quality.
Solution Approach 2:
The first capacitor acts as an intermediary element between the signal lines and the driving transistor. It mediates the voltage fluctuations by storing and releasing charge as needed, isolating the driving transistor from the instability caused by parasitic capacitance in the signal lines.
2Reliability
If signal lines are placed close to the gate of the driving transistor to reduce parasitic capacitance, then node voltage stability improves, but the layout space is limited
Solution Approach 1:
The first capacitor is positioned in a different spatial dimension or layer relative to the signal lines and driving transistor. By utilizing the vertical stacking dimension in the pixel circuit layout, the capacitor can be placed above or below other components, effectively reducing the horizontal layout area while maintaining its voltage stabilization function.
Solution Approach 2:
The first capacitor is nested within the existing pixel circuit structure, utilizing the space between other components such as the signal lines and driving transistor. This nested arrangement allows the capacitor to be integrated without significantly increasing the overall pixel area, as it occupies otherwise unused space in the layout.
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 stabilizes the gate potential of the driving transistor, improving display quality by reducing power consumption and maintaining high resolution without increasing the panel thickness or occupying more space.
Implementation Method 1
a first capacitor, wherein a first electrode plate of the first capacitor is connected to the gate of the driving transistor
Data Source
AI summary
A display panel and a display device are provided. The display panel includes: a pixel circuit including a driving transistor, a first transistor, and a second transistor; a light-emitting element; a first signal line connected to a gate of the first transistor; a second signal line connected to a gate of the second transistor; and a first capacitor. A source or drain of the first transistor is connected to a gate of the driving transistor; and a source or drain of the second transistor is connected to a source or drain of the driving transistor. When being projected on a surface of the display panel, the second signal line is located between the gate of the driving transistor and the first signal line, or the first signal line and the second signal line are located at two sides of the gate of the driving transistor respectively.