Electroluminescence Display Light Compensation Layer
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Solution Overview
Problem
Electroluminescence display apparatuses face limitations in enhancing the micro-cavity effect and maintaining device characteristics due to light reflection issues and poor interface characteristics between the light emitting layer and the second electrode, leading to reduced light efficiency and device performance.
Innovation Solution
Incorporating a first light compensation layer with a lower refractive index between the light emitting layer and the second electrode to increase the micro-cavity effect and prevent device characteristic reduction, while protecting the light emitting layer from damage by forming the second electrode on the compensation layer rather than directly on the emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second electrode is provided directly on the light emitting layer, then the device structure is simple, but the interface characteristic between the light emitting layer and the second electrode is poor, leading to reduced device characteristic
Solution Approach 1:
A first light compensation layer is introduced as an intermediary between the light emitting layer and the second electrode. This compensation layer has a lower refractive index than the light emitting layer, creating optimal optical conditions at the interface while preventing direct contact between the metal second electrode and the organic light emitting layer, thus improving device characteristic without significantly increasing structural complexity.
2Loss of energy
If light is reflected by the first electrode, then light efficiency increases due to micro-cavity effect, but most of the light is output to the outside, limiting the micro-cavity effect
Solution Approach 1:
The refractive index parameter of the layer adjacent to the light emitting layer is changed by introducing the first light compensation layer with a lower refractive index. This parameter change optimizes the optical impedance matching and enhances the micro-cavity effect, allowing for better light confinement and increased light efficiency without excessive light output to the outside.
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 solution enhances light efficiency by promoting repeated light reflection and increases the micro-cavity effect without reducing light extraction, while protecting the light emitting layer and maintaining device performance.
Implementation Method 1
since light emitted from the light emitting layer 50 is repeatedly reflected between the light emitting layer 50 and the first electrode 30, and thus light efficiency increases. This denotes a micro-cavity effect.
Implementation Method 2
This denotes a micro-cavity effect
Implementation Method 3
since the second electrode 60 including a metal material is provided on the light emitting layer 50, an interface characteristic between the light emitting layer 50 and the second electrode 60 is not good, and due to this, a device characteristic is reduced
Data Source
AI summary
Disclosed is an electroluminescence display apparatus for increasing a micro-cavity effect and preventing a device characteristic from being reduced. The electroluminescence display apparatus including an active area where a plurality of pixels are provided includes a substrate, a circuit element layer on the substrate, a first electrode on the circuit element layer, a light emitting layer on the first electrode, a second electrode on the light emitting layer, and a first light compensation layer between the light emitting layer and the second electrode. Since the first light compensation layer having a refractive index lower than that of the light emitting layer is disposed between the light emitting layer and the second electrode, light may be repeatedly reflected thereby increasing light efficiency, which in turn increases the micro-cavity effect.