Organic Light-Emitting Display Aperture Ratio via Capacitor Overlap
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face challenges in achieving a high aperture ratio and simple manufacturing processes, with capacitors often being separate from power source voltage supply lines, which limits the light-emitting region and aperture ratio.
Innovation Solution
The design incorporates a first capacitor connected to a power source voltage supply line, allowing overlap and parallel electrostatic capacity, and a compensation capacitor with a MIM Cap structure, along with a manufacturing method involving multiple mask processes to form transistors, capacitors, and light-emitting layers on the same plane, enhancing the aperture ratio and electrostatic capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capacitors are placed separately from power source voltage supply lines, then manufacturing process is simplified, but aperture ratio is reduced
Solution Approach 1:
The patent combines the capacitor structure with the power source voltage supply line by forming the capacitor's second electrode and the power source voltage supply line simultaneously in the same plane, allowing them to overlap spatially. This merging approach enables the capacitor to be positioned over the power source voltage supply line, thereby increasing the light-emitting region area and aperture ratio while maintaining manufacturing simplicity through integrated formation processes.
Solution Approach 2:
The patent transitions from a traditional planar separation of capacitors and power lines to a three-dimensional overlapping configuration where the capacitor is positioned vertically above the power source voltage supply line in the same plane. This spatial reconfiguration in another dimension allows both components to coexist without interfering with each other's function, maximizing the light-emitting region while maintaining electrical performance.
2Area of stationary object
If aperture ratio is increased by overlapping capacitor and power line, then light-emitting region is widened, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of the capacitor's second electrode and the power source voltage supply line into a single simultaneous process step, where both structures are formed in the same plane together. This integrated approach prevents additional manufacturing steps that would otherwise be required to create separate capacitor and power line structures, thereby avoiding increased manufacturing complexity despite the overlapping three-dimensional configuration.
Solution Approach 2:
The patent designs the second electrode of the capacitor to serve dual functions: as a capacitor electrode for electrical storage and as a structural element that overlaps with the power source voltage supply line to define the light-emitting region. This multi-functionality reduces the need for separate dedicated structures, simplifying the overall manufacturing process while achieving the desired aperture ratio enhancement.
3Manufacturing precision
If first capacitor uses non-doped semiconductor electrode, then electrostatic capacity is reduced, but manufacturing precision is improved
Solution Approach 1:
The patent combines multiple capacitor structures (first capacitor with non-doped semiconductor electrode and second capacitor with doped semiconductor electrode) in parallel configuration. The merging of these capacitor pathways allows the system to benefit from the manufacturing precision of non-doped electrodes while compensating for the reduced electrostatic capacity through the parallel connection with additional capacitor structures that provide the necessary electrical performance.
Solution Approach 2:
The patent employs a composite capacitor system where non-doped semiconductor material (offering manufacturing precision) is combined with doped semiconductor material (providing higher electrostatic capacity) in parallel configurations. This composite approach leverages the advantages of both material types, achieving both manufacturing precision and sufficient electrostatic capacity through their synergistic combination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration widens the light-emitting region, increases the aperture ratio, and improves the voltage margin by allowing capacitors and power lines to overlap, while simplifying the manufacturing process through a structured mask process approach.
Implementation Method 1
a first capacitor including a first electrode formed on the same plane as the semiconductor layer, a second electrode formed on the same plane as the gate electrode
Implementation Method 2
a second capacitor including a first electrode formed on the same plane as the semiconductor layer and which includes ion impurities, and a second electrode formed on the same plane as the gate electrode
Implementation Method 3
a light-emitting layer disposed on the pixel electrode
Implementation Method 4
an opposite electrode disposed on the light-emitting layer and facing the pixel electrode
Data Source
AI summary
In an organic light-emitting display apparatus and a method of manufacturing the same, the organic light-emitting display apparatus comprises: at least one transistor, each including a semiconductor layer, a gate electrode, and source and drain electrodes; a first capacitor including a first electrode formed on the same plane as the semiconductor layer, a second electrode formed on the same plane as the gate electrode, and a third electrode formed on the same plane as the source and drain electrodes; a second capacitor including a first electrode formed on the same plane as the semiconductor layer and comprising ion impurities, and a second electrode formed on the same plane as the gate electrode; a pixel electrode formed on the same plane as the gate electrode and electrically connected to the transistor; a light-emitting layer disposed on the pixel electrode; and an opposite electrode disposed on the light-emitting layer and facing the pixel electrode.