Display Pixel Circuits With Stacked Capacitors for High-Resolution Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in designing high-resolution pixels due to the limited space and complexity of pixel circuits, which hinders their integration into smaller form factors.
Innovation Solution
The display device incorporates a novel design with first and second capacitors formed between gate and source metal layers, reducing the line width and pixel design space, and includes a driving voltage line with separate portions to minimize voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional pixel circuit designs are used, then the pixel circuit can perform basic functions, but the pixel area becomes too large for high-resolution displays
Solution Approach 1:
The patent transitions from planar capacitor arrangement to three-dimensional stacked arrangement, placing capacitors at different vertical levels (first capacitor in first interlayer insulating layer, second capacitor in second interlayer insulating layer). This vertical stacking enables significant pixel area reduction while preserving all circuit functions through spatial optimization.
2Area of moving object
If pixel circuit area is reduced for high-resolution pixels, then display resolution improves, but voltage drop increases due to shorter conductor paths
Solution Approach 1:
The patent applies different conductor materials to different regions and levels of the pixel circuit. The first source metal layer uses a material with first electrical conductivity, while the second source metal layer uses a material with second electrical conductivity. This localized material optimization compensates for shorter conductor paths in reduced-area pixels, maintaining voltage stability despite compact design.
Solution Approach 2:
The pixel circuit employs composite material structure with multiple metal layers having different electrical conductivity characteristics. By combining materials with different properties in a stacked configuration, the design achieves both area reduction and voltage drop mitigation through synergistic material properties at different circuit levels.
Data Source
AI summary
A display device including a light-emitting element disposed on a substrate, a driving voltage line supplying a driving voltage, a first transistor that controls a driving current supplied to the light-emitting element, a second transistor that provides a data voltage to a gate electrode of the first transistor, a third transistor that provides a driving voltage to a drain electrode of the first transistor, a first capacitor including a first electrode electrically connected to the gate electrode of the first transistor and a second electrode electrically connected to a first electrode of the light-emitting element, and a second capacitor including a first electrode electrically connected to the driving voltage line and a second electrode electrically connected to the first electrode of the light-emitting element. The first electrode and the second electrode of the second capacitor are above the first electrode and the second electrode of the first capacitor.