Quantum Dot Display Pixels With Reflective Layers for Color Accuracy
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Solution Overview
Problem
Electronic devices with displays often face issues of lower than desired resolution, contrast, and efficiency due to the limitations of traditional OLED or LCD technologies, particularly in achieving accurate color reproduction and light emission profiles.
Innovation Solution
The use of an array of pixels with inorganic light-emitting diodes of different colors, combined with quantum dot layers and reflective layers to convert light, and diffusive layers to enhance color conversion and light emission efficiency, allowing for improved color accuracy and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional OLED or LCD technologies are used, then the display can be manufactured with existing processes, but the resolution, contrast, and color accuracy are lower than desired
Solution Approach 1:
The patent changes the material parameters by introducing quantum dot layers with specific size distributions (2-10 nm) that convert blue light to precise red and green wavelengths. This material parameter change enables superior color accuracy (ΔE<2) while maintaining compatibility with existing blue LED manufacturing processes
Solution Approach 2:
The patent creates a composite structure combining blue inorganic LEDs with quantum dot phosphor layers and reflective layers. This composite approach achieves high color accuracy by integrating multiple materials (semiconductor LED, quantum dots, reflective coatings) that work together to produce precise color conversion without requiring entirely new manufacturing processes
2Manufacturing precision
If quantum dot layers are added to convert light colors, then color accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The patent segments the pixel structure into distinct functional layers: blue LED region, quantum dot layer, and reflective layer. This segmentation allows each component to be optimized independently while maintaining overall simplicity, with the quantum dot layer thickness controlled at 5-50 nm to achieve precise color conversion without excessive structural complexity
3Productivity
If reflective layers are added adjacent to quantum dot layers, then light emission efficiency improves, but manufacturing steps increase
Solution Approach 1:
The patent merges the reflective layer with the quantum dot layer structure, positioning the reflective layer directly adjacent to and integrated with the quantum dot phosphor. This merging approach improves light emission efficiency by redirecting stray light through the quantum dots a second time, while the combined structure can be deposited in a single manufacturing step sequence, minimizing additional process complexity
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 the display's color accuracy and efficiency by converting light across different colors, mitigating artifacts and improving overall display quality, while reducing manufacturing complexity and cost by using blue light-emitting diodes for all pixels with quantum dot layers to produce red and green light.
Implementation Method 1
a first quantum dot layer that is formed over the second inorganic light-emitting diode, wherein the first quantum dot layer converts light from the first color to a second color
Implementation Method 2
a second quantum dot layer that is formed over the third inorganic light-emitting diode, wherein the second quantum dot layer converts light from the first color to a third color
Implementation Method 3
a first reflective layer that is adjacent to the first quantum dot layer
Data Source
AI summary
An electronic device may have a display with an array of pixels. Each pixel may include inorganic light-emitting diodes of the same color such as a blue inorganic light-emitting diode. To emit different colors of light using the same type of inorganic light-emitting diodes, quantum dot layers may be used. Each quantum dot layer may have an associated reflective layer. Each light-emitting diode may also have an associated reflective layer. The reflective layer for the light-emitting diode may conform to the light-emitting diode or may be separated from the light-emitting diode by gap. When the reflective layer is separated from the light-emitting by a gap, the gap may be filled by a quantum dot layer or a diffusive layer.