Storage Capacitor Electrode Area Expansion in High-Resolution Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the resolution of display devices increases, the area allocated to each pixel narrows, making it challenging to maintain stable voltage and reduce noise during external compensation due to the limited space for positioning driving transistors and storage capacitors.
Innovation Solution
The display device incorporates a first capacitor electrode with concave and convex portions, along with a buffer layer and second capacitor electrode, to increase the electrode area of the storage capacitor, thereby enhancing capacitance and allowing for stable external compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display device is increased, then the display quality is improved, but the area allocated to each pixel becomes narrow, making it difficult to maintain stable voltage and reduce noise
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar capacitor structure to a three-dimensional structure with protrusions and recesses. The first and second capacitor electrodes include vertical protrusions and corresponding recesses that extend in the thickness direction, effectively utilizing the third dimension (depth) to increase the electrode area without expanding the pixel footprint in the plane.
Solution Approach 2:
The patent implements nesting by having the protrusions and recesses interlock between the first and second capacitor electrodes. The recesses of one electrode fit into the protrusions of the other electrode, creating a nested configuration that maximizes the overlapping area within the limited pixel space while maintaining the capacitor's functional structure.
2Quantity of substance
If the electrode area of the storage capacitor is increased within a given space, then the capacitance is increased, but the structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the capacitor electrodes into multiple segments with protrusions and recesses rather than using a single continuous electrode structure. This segmentation allows the electrodes to be formed using standard photolithography and etching processes while creating the necessary three-dimensional geometry to increase capacitance without requiring complex custom fabrication techniques.
Data Source
AI summary
According to an embodiment, a display device includes: a first capacitor electrode disposed on a substrate to include a first conductive layer and a second conductive layer disposed on the first conductive layer; a buffer layer disposed on the first capacitor electrode; a second capacitor electrode disposed on the buffer layer; a driving transistor disposed on the substrate; and a storage capacitor disposed on the substrate and electrically connected to the driving transistor, wherein the first capacitor electrode includes a concave portion and a convex portion depending on a pattern of the second conductive layer disposed on the first conductive layer, the buffer layer and the second capacitor electrode each include protrusions and depressions corresponding to the concave portion and the convex portion of the first capacitor electrode, and the first capacitor electrode and the second capacitor electrode form two electrodes of the storage capacitor.