OLED Emission Area Expansion via Substrate Trench Capacitors
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face challenges in maximizing luminous efficiency due to the surface area occupied by capacitors, which limits the emission area and light extraction efficiency.
Innovation Solution
The solution involves forming capacitors within trenches on the substrate, allowing for a larger OLED emission area by reducing the surface area occupied by capacitors, and using a semiconductor layer and transparent conductive materials for the electrodes, along with a specific layer structure including a hole injection layer, transport layers, and an electron injection layer for improved light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If capacitors are disposed separately from OLED on the substrate surface, then capacitor function is achieved, but emission area is reduced
Solution Approach 1:
The capacitor is nested within the substrate structure by forming it inside a trench. The capacitor lower electrode is formed on the bottom of the trench, the gate insulating layer is formed on the capacitor lower electrode, and the capacitor upper electrode is formed on the gate insulating layer, creating a compact structure that occupies minimal surface area while maintaining full capacitor functionality
Solution Approach 2:
The capacitor structure transitions from a planar surface-mounted configuration to a three-dimensional structure embedded within the substrate. By utilizing the vertical dimension and forming the capacitor inside a trench, the design eliminates surface area conflict between capacitors and OLED emission regions
2Productivity
If capacitor surface area is reduced to increase emission area, then luminous efficiency is improved, but capacitor capacity may be compromised
Solution Approach 1:
The capacitor is nested within the substrate structure by forming it inside a trench. The capacitor lower electrode is formed on the bottom of the trench, the gate insulating layer is formed on the capacitor lower electrode, and the capacitor upper electrode is formed on the gate insulating layer, creating a compact structure that occupies minimal surface area while maintaining full capacitor functionality
Solution Approach 2:
The capacitor design utilizes changes in geometric parameters ( trench depth, electrode area within trench, gate insulating layer thickness) to optimize the balance between capacitor capacity and surface area occupation. By adjusting these parameters, the capacitor achieves sufficient capacity while minimizing its footprint to maximize OLED emission area
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 enhances the luminous efficiency of the organic light-emitting display by increasing the emission area and improving light extraction, resulting in better display performance with wider viewing angles and faster response rates.
Implementation Method 1
organic light-emitting display apparatuses are self-emission display apparatuses
Implementation Method 2
The pixel electrode may include a transparent conductive material
Implementation Method 3
a gate insulating layer disposed between the semiconductor layer and the gate electrode
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate, a plurality of organic light-emitting diodes on the substrate, and a plurality of capacitors located next to at least one side of one of the organic light-emitting diodes. The capacitors are arranged inside trenches within the substrate.