Organic Light Emitting Element Resonator Structure
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Solution Overview
Problem
There is a lack of integrated projection type display devices that utilize self-luminous type light emitting elements, where a light source and spatial modulator are combined, and existing technologies do not efficiently utilize light emitted from organic electroluminescence display devices due to low light extraction efficiency.
Innovation Solution
A light emitting element with a resonator structure formed between a light reflecting layer and the interface of the second electrode and organic layer, and a projection type display device comprising a panel with multiple light emitting elements sandwiched between substrates, where each element includes a luminescent layer configured by layering multiple layers of the same color, enhancing light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional light source and spatial modulator are used separately, then light can be output, but the device complexity increases and light loss occurs at panel joints
Solution Approach 1:
The patent merges the light source and spatial modulator functions into a single integrated light emitting element. The organic electroluminescence element directly forms images through its luminescent layers, eliminating the need for separate light sources and spatial modulators. This integration reduces device complexity and prevents light loss at panel joints by removing the interfaces between separate components.
2Loss of energy
If light extraction efficiency is low, then power consumption increases, but adding resonator structures increases device complexity
Solution Approach 1:
The patent makes the luminescent layer serve multiple functions: it generates light through electroluminescence and simultaneously acts as a resonator structure. By configuring the luminescent layer with specific thickness and material properties, it resonates to enhance light extraction efficiency without requiring additional separate resonator components, thus reducing device complexity while improving energy efficiency.
Solution Approach 2:
The resonator structure is nested within the luminescent layer itself rather than being added as an external component. The luminescent layer is configured with specific thickness (e.g., 50-200 nm) and refractive index properties to create the resonator effect internally, embedding the light extraction enhancement function within the existing structural layer.
3Productivity
If multiple luminescent layers of the same color are layered, then light output efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes parameters such as the thickness of each luminescent layer (e.g., 50-200 nm), the refractive index of materials, and the spacing between layers to achieve resonant enhancement. By carefully controlling these parameters, the multi-layer structure achieves high light output efficiency through constructive interference of light waves, while the parameter optimization provides clear manufacturing targets that can be achieved with standard precision.
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 enables the formation of images using self-luminous type light emitting elements, improving light extraction efficiency and reducing power consumption by directing light output in a highly directional manner, eliminating the need for a telecentric optical system and preventing light loss at the panel joints.
Implementation Method 1
an organic layer formed on the first electrode and including a luminescent layer composed of an organic luminescent material
Implementation Method 2
light emitted in the luminescent layer is resonated between the light reflecting layer and an interface of the second electrode and the organic layer
Data Source
AI summary
A light emitting element includes a first electrode, an organic layer formed on the first electrode and including a luminescent layer composed of an organic luminescent material and a second electrode formed on the organic layer, and further includes a light reflecting layer provided below the first electrode. Light emitted in the luminescent layer is resonated between the light reflecting layer and an interface of the second electrode and the organic layer, and a portion of the light is output from the second electrode.