OLED Lighting Apparatus with Triple-Layer Electrode for Front Luminance
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Solution Overview
Problem
Conventional lighting apparatuses, such as incandescent and fluorescent lamps, face issues with energy efficiency and color rendering index, while LED lamps have reduced luminous efficiency when combining red, green, and blue light emitting diodes to produce white light, and organic light emitting diode (OLED) lamps suffer from dispersed luminance, failing to achieve sufficient front luminance for applications like vehicle lighting.
Innovation Solution
A lighting apparatus using an OLED with a first electrode formed as a triple layer, including at least one metal and one dielectric layer in the emission area, and only dielectric layers in the non-emission area, combined with an external light extracting layer of regular four-sided pyramid shape to enhance front luminance and restrict current flow, thereby improving luminance concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an organic light emitting diode is used to emit light at various angles, then the luminance is dispersed to both front and side directions, but the front luminance does not reach the reference value
Solution Approach 1:
The first electrode is designed with different structures in different regions: in the emission area it includes at least one metal layer and at least one dielectric layer to deflect light forward, while in the non-emission area it includes only dielectric layers to restrict current. This local differentiation resolves the contradiction by optimizing light emission characteristics for front luminance enhancement while maintaining the multi-angle emission capability of OLED
Solution Approach 2:
The first electrode acts as an intermediary component between the organic layer and the external environment. By introducing the metal layer and dielectric layer configuration in the emission area, it mediates the light emission process to deflect light toward the front direction, thereby improving front luminance without eliminating the OLED's inherent multi-angle emission property
2Illumination intensity
If the first electrode is formed with at least one metal layer and at least one dielectric layer in the emission area, then light is deflected to improve front luminance, but the device complexity increases
Solution Approach 1:
The complex triple-layer electrode structure (metal layer + dielectric layer) is applied only in the emission area where light deflection is needed, while the non-emission area uses a simpler single dielectric layer structure. This local quality approach enhances front luminance through the complex structure where necessary while minimizing overall device complexity by using simpler structures where possible
3Reliability
If the first electrode disposed in the non-emission area includes only dielectric layers, then current flow is restricted in the short generating area, but the electrode's light deflection capability is reduced
Solution Approach 1:
The electrode structure is locally optimized: in the non-emission area where current restriction is the primary concern, only dielectric layers are used to effectively restrict current flow and prevent short circuits. In the emission area where light deflection is critical, the full triple-layer structure with metal and dielectric layers is maintained to ensure proper light emission and deflection. This spatial differentiation resolves the contradiction between current restriction and light deflection requirements
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
The solution achieves improved front luminance, reaching up to 12000 nit, with uniform current distribution and enhanced light concentration on the front surface, addressing the inefficiencies of previous technologies.
Implementation Method 1
a lighting apparatus using an organic light emitting diode emits light at various angles
Implementation Method 2
a first electrode is formed as a triple layer to deflect light generated in the organic light emitting diode unit
Implementation Method 3
a unit structure of an external light extracting layer is formed to have a regular four-sided pyramid shape to improve the front luminance
Data Source
AI summary
A lighting apparatus using an organic light emitting diode that has an emission area and a non-emission area, the light emitting apparatus comprises a first electrode; an organic layer disposed on the first electrode; a second electrode disposed on the organic layer; and an insulating layer disposed in the non-emission area, wherein the first electrode disposed in the emission area includes at least one metal layer and at least one dielectric layer, and wherein the first electrode disposed in the non-emission area includes at least one dielectric layer.