OLED Capacitor Electrode Nested Structure for Pixel Area Reduction
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Solution Overview
Problem
In organic light emitting diode displays, the protruding patterns on capacitor electrodes increase the pixel area and current load, leading to inefficiencies in manufacturing and performance.
Innovation Solution
The design includes a first capacitor electrode with a protruding portion that does not overlap the second capacitor electrode, and a recess portion on the second electrode, both of equal width, aligned on the same imaginary line, to minimize the pixel area and current load, with additional thin film transistors and capacitors optimized for efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a protruding pattern is added to the capacitor electrode to compensate for process deviation, then manufacturing precision is improved, but the pixel area increases and current load increases
Solution Approach 1:
The protruding portion of the first capacitor electrode is nested within the recess portion of the second capacitor electrode, allowing the capacitor to compensate for process deviation without increasing the overall pixel area. The nested configuration enables the protruding pattern to be hidden within the existing electrode structure rather than adding external protrusions.
Solution Approach 2:
The solution transitions from a two-dimensional planar electrode configuration to a three-dimensional nested structure by creating vertical overlapping regions. The recess portion extends in the vertical dimension to accommodate the protruding portion, enabling compact integration that compensates for manufacturing variations without expanding the pixel footprint.
2Manufacturing precision
If a protruding pattern is added to the capacitor electrode to compensate for process deviation, then manufacturing precision is improved, but the current load through the capacitor increases
Solution Approach 1:
The nested configuration minimizes the effective capacitance area by having the protruding portion fit within the recess portion, thereby reducing the overlapping area that would contribute to capacitance. This reduces the current load through the capacitor while still providing process deviation compensation through the geometric alignment.
Solution Approach 2:
The protruding and recess portions are strategically positioned to create localized compensation zones only where needed for process deviation, rather than uniformly increasing the capacitor structure throughout. This localized approach minimizes the overall current load while providing precise compensation at critical interfaces.
3Manufacturing precision
If the capacitor electrode is designed with complex protruding and recess patterns, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The nested structure integrates the protruding and recess portions into a unified capacitor configuration that can be manufactured using standard thin-film deposition and etching processes. The nested geometry is achieved through sequential layer formation rather than complex post-processing, maintaining manufacturing simplicity while providing precise geometric control for compensation.
Solution Approach 2:
The first and second capacitor electrodes are designed with asymmetric protruding and recess portions that are optimized for their specific functional roles. The asymmetry allows each electrode to be tailored for its specific compensation needs while maintaining overall structural simplicity through standardized fabrication techniques.
Data Source
AI summary
An organic light emitting diode display including: a substrate; an organic light emitting diode on the substrate; a first thin film transistor coupled to the organic light emitting diode; and a first capacitor including a first capacitor electrode coupled to a first gate electrode of the first thin film transistor and a second capacitor electrode on the first capacitor electrode. The first capacitor electrode includes a protruding portion not overlapping the second capacitor electrode, and the second capacitor electrode includes a recess portion through which the first capacitor electrode is exposed.