Vertical Electrode Capacitor for High-Resolution EL Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electroluminescent display apparatuses face limitations in achieving ultra-high resolution due to the need for increased capacitor capacity, which requires larger subpixel areas, thereby restricting the miniaturization of display components.
Innovation Solution
The electroluminescent display apparatus incorporates a capacitor design where the gate and capacitor electrodes extend vertically, with insulation layers, allowing for increased capacitor capacity within a narrower region, thereby enabling higher resolution without expanding subpixel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacity of the capacitor is increased to enhance voltage holding characteristic, then the voltage holding characteristic is improved, but the area of each subpixel must increase
Solution Approach 1:
The patent transitions from a planar capacitor structure to a three-dimensional structure by extending the gate electrode and capacitor electrode vertically in the thickness direction. This dimensional change allows the capacitor to achieve larger capacity without increasing the horizontal subpixel area, as the capacitance is increased through vertical stacking rather than horizontal expansion.
Solution Approach 2:
The capacitor structure is nested within the vertical space of the subpixel by stacking the gate electrode, capacitor electrode, and insulation layers in the thickness direction. This nesting approach utilizes the vertical dimension to accommodate the capacitor components, allowing high-capacity storage within the constrained horizontal footprint of each subpixel.
2Quantity of substance
If the area of each subpixel is increased to increase capacitor capacity, then the capacitor capacity is improved, but ultra-high resolution cannot be realized
Solution Approach 1:
The patent resolves the conflict between capacitor capacity and resolution by moving the capacity enhancement to the vertical dimension through stacked electrodes and insulation layers. This allows the horizontal dimensions to remain small for high resolution while the vertical dimension provides the necessary capacitance through increased electrode overlap area and reduced separation distance.
3Manufacturing precision
If the subpixel area is reduced to achieve ultra-high resolution, then the resolution is improved, but the capacitor capacity becomes insufficient for voltage holding
Solution Approach 1:
By extending electrodes vertically and utilizing the thickness direction for capacitor structure, the patent decouples the relationship between horizontal area and capacitor capacity. This enables small horizontal subpixel areas for high resolution while maintaining sufficient capacitor capacity through vertical stacking of conductive and insulating layers.
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 voltage holding capability of subpixels, allowing for the realization of ultra-high resolution displays while maintaining compact subpixel dimensions.
Implementation Method 1
a light emitting layer is provided between two electrodes (i.e., an anode electrode and a cathode electrode) and emits light with an electric field generated between the two electrodes
Implementation Method 2
In the light emitting layer, an exciton is generated by a combination of an electron and a hole, and when the exciton is shifted from an excited state to a ground state, light is emitted
Data Source
AI summary
An electroluminescent display apparatus can include a driving thin film transistor on a substrate, the driving thin film transistor including a gate electrode, a source electrode, a drain electrode, and an active region; a capacitor electrode facing the gate electrode; a first electrode electrically connected to the source electrode; a light emitting layer on the first electrode; and a second electrode on the light emitting layer, wherein the gate electrode and the capacitor electrode extend in a vertical direction with respect to a surface of the substrate.