Pixel Circuit Capacitor Layout for Reliable Display Panels
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Solution Overview
Problem
Existing display panels face challenges in achieving improved display quality and reliability, particularly in the arrangement and connectivity of transistors and capacitors within the pixel structure, which affect the overall performance and durability of the display.
Innovation Solution
The display panel design includes a specific arrangement of transistors and capacitors, with overlapping electrodes forming capacitors and a common electrode, and a layered insulating structure that enhances the electrical connections and protection of the transistors, using materials like silicon oxide and silicon nitride layers for insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate electrode is connected to both upper electrodes of capacitors, then the driving characteristics and reliability of the pixel circuit are improved, but the device complexity increases
Solution Approach 1:
The gate electrode is merged with both upper electrodes of the first and second capacitors to form a single integrated conductive structure. This merging reduces the number of separate components and connections needed, while still achieving the dual-function benefit of controlling the transistor and maintaining capacitor voltages for improved reliability
2Ease of operation
If the gate electrode overlaps the active pattern, then the transistor control is improved, but the area occupied by the pixel circuit increases
Solution Approach 1:
The gate electrode is positioned to overlap the active pattern in the vertical dimension (thickness direction) rather than extending horizontally. This vertical stacking approach allows the transistor control function to be achieved without increasing the horizontal footprint of the pixel circuit, thereby maintaining compact pixel area while improving transistor control efficiency
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
This design improves the driving characteristics and reliability of the display panel by optimizing the capacitor function and protecting the transistors from environmental factors, leading to enhanced display quality and longevity.
Implementation Method 1
a first upper electrode that overlaps the first lower electrode and forms a first capacitor with the first lower electrode, a second upper electrode that overlaps the second lower electrode and forms a second capacitor with the second lower electrode
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A display panel includes data lines and a unit pixel including a first pixel, a second pixel, and a third pixel, wherein the first pixel includes a common electrode including a first lower electrode, a light shielding pattern, and a second lower electrode, a first upper electrode that overlaps the first lower electrode and forms a first capacitor with the first lower electrode, a second upper electrode that overlaps the second lower electrode and forms a second capacitor with the second lower electrode, a first transistor including an active pattern overlapping the light shielding pattern and a gate electrode overlapping the active pattern, and a light emitting element, and an end of the gate electrode is electrically connected to the first upper electrode, and another end thereof is electrically connected to the second upper electrode.