Micro-Cavity OLED Structure for Brightness and Power Efficiency
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Solution Overview
Problem
High power consumption and reduced lifespan of organic light emitting display devices due to high current operation, which affects brightness and efficiency, especially as pixel density increases.
Innovation Solution
The implementation of a micro-cavity structure in organic light emitting display devices with at least two emission layers in each red, green, and blue sub-pixels, adjusting the distance and thickness of organic material layers to enhance light efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high current is applied to increase brightness, then light emission intensity is improved, but power consumption increases and device lifespan decreases
Solution Approach 1:
The patent changes the optical parameters of the device by introducing a micro-cavity structure with specific cavity length (L) and wavelength (λ), transforming the light emission characteristics through constructive interference. This allows enhanced brightness without increasing current, as the optical resonance amplifies the light output efficiency
Solution Approach 2:
The patent adds an optical dimension to the electrical system by introducing resonant cavity modes. Instead of relying solely on increasing electrical current to improve brightness, the solution operates in the optical domain by creating standing waves within the micro-cavity, thereby amplifying light emission through optical resonance rather than electrical intensity
2Illumination intensity
If high current is applied to increase brightness, then light emission intensity is improved, but device lifespan decreases
Solution Approach 1:
The patent modifies the optical parameters by implementing a micro-cavity structure with specific geometric dimensions (cavity length L, layer thicknesses) that create resonant conditions. This parameter change enables enhanced light emission through optical interference, reducing the need for high current operation and thereby extending device lifespan
Solution Approach 2:
The patent converts the limitation of organic emission layers into a benefit by utilizing the micro-cavity resonance effect. The confined optical field within the cavity enhances light extraction efficiency, transforming the inherent limitation of organic materials into an advantage through optical resonance amplification
3Measurement precision
If pixel density is increased for higher definition, then display resolution is improved, but current per pixel increases leading to higher power consumption
Solution Approach 1:
The patent changes the optical parameters of each pixel by integrating a micro-cavity structure with specific resonant dimensions. This allows each pixel to achieve higher light emission efficiency through optical resonance, enabling high-resolution displays where each small pixel consumes less current while maintaining or enhancing brightness
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 improves light efficiency and reduces power consumption, extending the lifespan of the devices by optimizing the micro-cavity structure to enhance emission efficiencies and white light efficiency.
Implementation Method 1
an organic light emitting display device of a micro-cavity structure which is adapted to enhance light efficiency by adjusting the distance between organic emission layers
Implementation Method 2
the organic light emitting diode emits light when the excitons are transitioned from an excited state into a ground state
Data Source
AI summary
An organic light emitting display device includes a first electrode defined into red, green and blue sub-pixel regions; a first light emitting unit disposed on the first electrode and configured with a hole injection layer, a first hole transport layer, a first organic emission layer and a first electron transport layer. The device further includes a second light emitting unit disposed on the first light emitting unit and configured with a second hole transport layer, a second organic emission layer and a second electron transport layer; and a second electrode disposed on the second light emitting unit. A separation between the first organic emission layer and the second organic emission layer is larger than a separation between the first electrode and the first organic emission layer.