OLED Lighting Apparatus with Groove Auxiliary Electrodes
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Solution Overview
Problem
Organic light-emitting diode (OLED) lighting apparatuses face issues with non-uniform luminance due to high sheet resistance in transparent conductive electrodes and light loss in multiple directions, as well as sensitivity to temperature changes, leading to varying luminance across the device.
Innovation Solution
The OLED lighting apparatus incorporates a transparent substrate with groove lines, auxiliary electrodes made of conductive reflection materials, and positive temperature coefficients (PTCs) to improve electrical characteristics and light efficiency, while maintaining uniform luminance by connecting these elements and forming barrier rib layers to manage light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive material is used for electrodes, then light transmission is enabled, but sheet resistance becomes high causing non-uniform luminance
Solution Approach 1:
The patent combines transparent conductive material with reflective material to create a composite electrode structure. The transparent conductive layer enables light transmission while the reflective layer provides low resistance electrical conduction, resolving the contradiction between light transmission and electrical conductivity.
Solution Approach 2:
The electrode structure is designed to perform multiple functions simultaneously: the transparent conductive material provides both electrical conduction and light transmission, while the reflective layer enhances electrical conductivity and also manages light emission patterns.
2Productivity
If organic emission layer emits light in multiple directions, then surface light source function is achieved, but light is lost in directions not crossing the electrodes
Solution Approach 1:
The reflective layer, positioned behind the organic emission layer, captures light that would otherwise be lost by emitting in directions not crossing the electrodes. This converts the harmful light loss into beneficial light that is reflected back through the transparent electrode, improving overall light efficiency.
Solution Approach 2:
The patent introduces a vertical dimension to light management by placing the reflective layer beneath the emission layer. Light emitted in downward directions (which would be lost) is reflected upward through the transparent electrode, utilizing the vertical dimension to recover otherwise wasted light.
3Duration of action of stationary object
If OLED operates at elevated temperature, then device continues functioning, but current increases causing non-uniform luminance
Solution Approach 1:
The patent modifies the electrical parameters of the electrode system by incorporating the reflective layer, which changes the current distribution characteristics. This parameter change helps compensate for temperature-induced current increases, maintaining more uniform luminance during continuous operation.
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 light efficiency and achieves uniform luminance across the OLED lighting apparatus, even under temperature changes, by reducing sheet resistance and optimizing light reflection and emission patterns.
Implementation Method 1
positive temperature coefficients (PTCs) to improve electrical characteristics
Implementation Method 2
auxiliary electrodes made of conductive reflection materials, and positive temperature coefficients (PTCs) to improve electrical characteristics and light efficiency
Data Source
AI summary
Disclosed herein is an organic light-emitting diode lighting apparatus. The organic light-emitting diode lighting apparatus may include a transparent substrate main body with a plurality of groove lines formed therein, auxiliary electrodes formed in at least of the plurality of groove lines, a first electrode formed on the substrate main body, positive temperature coefficients configured to connect the auxiliary electrodes and the first electrode, an organic emission layer formed on the first electrode, and/or a second electrode formed on the organic emission layer.