OLED Pixel Capacitor Stack for High-Resolution Charge Capacity
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Solution Overview
Problem
The increasing resolution of organic light-emitting display apparatuses has limited the planar space available for capacitors, making it challenging to maintain a stable voltage and achieve sufficient charge capacity without increasing the capacitor's size.
Innovation Solution
The implementation of a capacitor structure with a double or multi-layer conductive configuration, where the first and second conductive layers form a capacitor in a small area, and additional layers are integrated to increase charge capacity without expanding the planar area, including a light-shielding function to prevent light intermixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacitor size is increased to provide sufficient charge capacity, then the charge capacity is improved, but the planar area occupied by the capacitor increases
Solution Approach 1:
The patent transitions from a conventional planar capacitor structure to a three-dimensional stacked capacitor structure. Multiple capacitor units are arranged vertically along the thickness direction of the substrate, with first and second conductive layers forming capacitor plates at different heights. This vertical stacking enables increased charge capacity while maintaining the same planar footprint, directly resolving the contradiction between charge capacity and planar area.
Solution Approach 2:
The patent implements a nested structure where multiple capacitor units are contained within a compact vertical space. The first conductive layer, second conductive layer, and intermediate insulating layers are nested sequentially in the thickness direction, creating a space-efficient configuration that maximizes charge capacity within the available vertical dimension without expanding the planar area.
2Measurement precision
If the resolution of the display apparatus is increased, then the image quality is improved, but the planar space allocated to each pixel is reduced
Solution Approach 1:
By stacking capacitor units vertically in the thickness direction rather than expanding them horizontally, the patent enables high-resolution display pixels to maintain sufficient capacitor capacity within reduced planar dimensions. This vertical arrangement allows each pixel to accommodate the required charge storage functionality without increasing its lateral footprint, thus supporting higher overall display resolution.
3Quantity of substance
If the capacitor structure is made more complex to increase charge capacity, then the charge capacity is improved, but the device complexity increases
Solution Approach 1:
The capacitor is segmented into multiple discrete capacitor units arranged in the vertical direction. Each capacitor unit consists of a first conductive layer, a second conductive layer, and insulating layers. This segmentation allows the total charge capacity to be distributed across multiple simpler units rather than requiring a single complex structure, making the overall design more manageable and manufacturable.
Solution Approach 2:
The first and second conductive layers serve multiple functions: they form the capacitor plates for charge storage, and the second conductive layer also functions as a light-shielding layer. This multi-functionality reduces the need for separate dedicated components, thereby increasing charge capacity without proportionally increasing device complexity.
4Quantity of substance
If additional conductive layers are added to increase charge capacity, then the charge capacity is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the light-shielding layer function with the second conductive layer of the capacitor structure. By combining these two functions into a single layer, the design achieves increased charge capacity through additional conductive layers while avoiding the need for separate light-shielding components, thus reducing overall manufacturing complexity.
Solution Approach 2:
The second conductive layer is designed to simultaneously serve as both a capacitor plate and a light-shielding layer. This multi-functional design reduces the total number of separate manufacturing steps and material depositions required, making the enhanced capacitor structure easier to manufacture despite the increased charge capacity functionality.
Data Source
AI summary
An organic light-emitting display apparatus includes: a display unit including an organic light-emitting element, a driving transistor electrically connected to the organic light-emitting element, and a capacitor; and a pad unit connected to the display unit, the capacitor including: a first conductive layer disposed on a substrate; a second conductive layer interposed between the substrate facing a first surface of the first conductive layer; and a third conductive layer disposed facing a second surface of the first conductive layer opposing the first surface of the first conductive layer, the third conductive layer being electrically connected to the second conductive layer.