Double-Sided OLED Reflection Layer for Light Output
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Solution Overview
Problem
Conventional both-side light emitting organic electroluminescence (EL) display devices emit light only from a small area where the first electrode is formed, resulting in reduced light output and shorter device lifespan due to the limited light emission area.
Innovation Solution
The solution involves forming a portion of the first electrode on a reflection film, which increases the light emission area by allowing light to be emitted from both ends of the electrode, thereby enhancing the overall light output and extending the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted only from the area where the first electrode is formed, then the device structure is simple, but the light output is reduced and device lifespan is shortened
Solution Approach 1:
The patent transitions from single-sided light emission (one dimension) to dual-sided light emission by adding a reflection layer beneath the first electrode. This allows light to be emitted from both the front surface and the back surface of the device, effectively doubling the light output area without significantly complicating the overall device structure.
Solution Approach 2:
The reflection layer acts as an intermediary component that redirects light generated in the organic light-emitting layer toward the back surface of the device. By introducing this intermediate reflective surface, the patent enables light to be emitted from both sides of the device, increasing total light output while maintaining structural simplicity.
2Duration of action of stationary object
If the light emission area is limited to the first electrode area, then the device structure is simple, but the device lifespan is reduced
Solution Approach 1:
By enabling light emission from both the front and back surfaces of the device through the addition of a reflection layer, the effective light emission area is doubled. This increased emission area distributes the operational stress across a larger region, thereby extending device lifespan without significantly increasing structural complexity.
3Productivity
If a reflection layer is added to enable dual-sided light emission, then light output is increased, but the device structure becomes more complex
Solution Approach 1:
The reflection layer serves as a simple intermediary component that efficiently redirects light toward the back surface of the device. This single additional layer doubles the light emission area and significantly improves light emission efficiency without introducing complex structural changes to the overall device architecture.
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 approach significantly increases the amount of emitted light and improves the device's lifespan by maximizing light emission from both sides of the first electrode, enhancing the display's performance and durability.
Implementation Method 1
a reflection layer arranged under a first electrode
Implementation Method 2
the organic light-emitting layer emits light when the excitons transition from an excited to ground state
Data Source
AI summary
The present invention relates to a both-side light emitting organic EL display device including a reflection film having an opening and a first electrode formed on the reflection film and in the opening. An organic layer is formed on the first electrode, and a second electrode is formed on the organic layer. The opening corresponds to a central portion of the first electrode.