Reflective Element for Inorganic LED Light Extraction
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Solution Overview
Problem
Existing display and lighting devices using inorganic LEDs face challenges in achieving high light-extraction efficiency and reducing power consumption due to total internal reflection of light.
Innovation Solution
The implementation of a display device and lighting device structure that includes a substrate with pixels and reflective elements, where each pixel comprises a pixel circuit, a light-emitting element with a pixel electrode, a first stack structure, and a common electrode, and the reflective element includes a lower electrode, a second stack structure, and a reflective film, all utilizing inorganic semiconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic LEDs are used to provide high luminance, then brightness is improved, but light-extraction efficiency deteriorates due to total internal reflection
Solution Approach 1:
The patent introduces a reflective element positioned at a lateral dimension relative to the light-emitting element, creating a new optical path dimension. This allows light that would normally be trapped by total internal reflection to be redirected toward the extraction surface, effectively adding a spatial dimension to light management and resolving the contradiction between high luminance and poor light-extraction efficiency.
Solution Approach 2:
The reflective element acts as an intermediary component between the light-emitting element and the external environment. It mediates the interaction by capturing internally reflected light and redirecting it toward extraction, thus improving light-extraction efficiency without compromising the high luminance output of the inorganic LED.
2Ease of manufacture
If conventional LED structure is used, then manufacturing is simplified, but power consumption increases due to light loss
Solution Approach 1:
The patent segments the device into distinct functional modules: the light-emitting element, the reflective element, and the substrate. This modular segmentation allows for optimized light management in each component while maintaining overall manufacturing simplicity. The reflective element can be independently fabricated and integrated, enabling improved power efficiency without significantly complicating the manufacturing process.
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-extraction efficiency and reduces power consumption by effectively reflecting and extracting light that would otherwise be lost due to total internal reflection, thereby improving the reliability and efficiency of the display and lighting devices.
Implementation Method 1
The at least one reflective element includes a lower electrode, a second stack structure over the lower electrode, and a reflective film overlapping the second stack structure
Implementation Method 2
Existing display and lighting devices using inorganic LEDs face challenges in achieving high light-extraction efficiency and reducing power consumption due to total internal reflection of light
Data Source
AI summary
Disclosed is a display device including a substrate as well as a plurality of pixels and at least one reflective element located over the substrate. Each of the plurality of pixels has a pixel circuit and a light-emitting element, and the light-emitting element has a pixel electrode electrically connected to the pixel circuit, a first stack structure over the pixel electrode, and a common electrode over the first stack structure. At least one reflective element has a lower electrode, a second stack structure over the lower electrode, and a reflective film overlapping the second stack structure. Each of the first stack structure and the second stack structure includes a plurality of inorganic semiconductor layers.