Three-Electrode Storage Capacitor Layout for High-Resolution OLED Displays
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Solution Overview
Problem
As display devices increase in resolution, the space available for capacitors in subpixels becomes narrower, leading to a reduction in capacitance that is insufficient to maintain data signals for one frame, posing a challenge in maintaining high-resolution displays.
Innovation Solution
The organic light-emitting display apparatus incorporates a capacitor structure with multiple storage capacitor electrodes, including a first storage capacitor electrode on the same layer as the first gate electrode, a second storage capacitor electrode on the same layer as the second gate electrode or a light-blocking pattern, and a third storage capacitor electrode between the first and second electrodes, connected in parallel, utilizing oxide semiconductor patterns for enhanced capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display resolution is increased, then the display quality is improved, but the space available for capacitors in subpixels is reduced, leading to insufficient capacitance
Solution Approach 1:
The patent introduces a third storage capacitor electrode positioned between the first and second electrodes, adding a vertical dimension to the capacitor structure. This three-electrode configuration creates multiple capacitor regions (first capacitor region between first and third electrodes, second capacitor region between second and third electrodes) that can be connected in parallel, effectively increasing the total capacitance value without expanding the planar footprint of the subpixel.
2Measurement precision
If the capacitor space is reduced to accommodate high resolution, then the display resolution is improved, but the data signal storage capability deteriorates
Solution Approach 1:
By adding the third electrode positioned between the first and second electrodes, the patent creates a multi-layer capacitor structure that increases storage capability vertically rather than horizontally. This allows sufficient capacitance to maintain data signals for one frame even in high-resolution displays with limited subpixel space.
Solution Approach 2:
The first and second capacitor regions are connected in parallel to form a unified storage capacitor with combined capacitance. This merging of multiple capacitor regions ensures that the total capacitance meets the minimum requirement for data signal storage while maintaining compatibility with high-resolution display architectures.
3Ease of manufacture
If the capacitor structure is simplified to reduce manufacturing complexity, then the ease of manufacture is improved, but the capacitance value is reduced
Solution Approach 1:
The first, second, and third storage capacitor electrodes are formed using the same conductive material layer, allowing them to be manufactured simultaneously in a single deposition process. This merging of electrode formation into one manufacturing step increases capacitance value without proportionally increasing manufacturing complexity, as the electrodes share common process steps and materials.
Data Source
AI summary
Disclosed is an organic light-emitting display apparatus including a storage capacitor including a plurality of electrodes connected to each other in parallel so as to have a high capacitance per unit area. The organic light-emitting display apparatus includes a driving thin film transistor including an oxide semiconductor pattern blocked by a first light-blocking pattern, and a storage capacitor including a first storage capacitor electrode disposed on the same layer as the first gate electrode, a second storage capacitor electrode disposed on the same layer as one of the second gate electrode and the first light-blocking pattern, and connected to the first storage capacitor electrode, and a third storage capacitor electrode disposed between the first storage capacitor electrode and the second storage capacitor electrode.