Multicolor Light Emitters With Positioned Converters for Fine Pixels
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Solution Overview
Problem
Current display technologies face challenges in fabricating pixels with sub-pixels emitting different colors, as existing methods lead to difficulties in controlling the wavelength of light emission, especially at smaller dimensions, due to issues like light scattering and intermixing of radiation converters.
Innovation Solution
The development of an emitting device comprising a substrate with native color and converted light emitters, where the radiation converters are precisely positioned using techniques like grafting and embedding in a resin, allowing for accurate control of light emission wavelengths and improved spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radiation converters are placed onto the surface of LED structure to convert light wavelength, then sub-pixels with different colors can be obtained, but the position of radiation converters is difficult to control and intermixing occurs between adjacent converters
Solution Approach 1:
The invention divides each pixel into multiple independently controllable light-emitting regions, where each region contains its own LED structure and radiation converter. This segmentation allows precise spatial separation of converters, preventing intermixing while enabling independent color control of each sub-pixel through individual electrical contacts.
Solution Approach 2:
Each light-emitting region is designed with localized properties: specific LED structures with particular bandgaps, dedicated radiation converters with specific conversion characteristics, and individual electrical contacts. This local quality ensures that each sub-pixel can be precisely tuned to emit a specific color without affecting adjacent regions, resolving the position control issue.
2Productivity
If the spatial pitch between pixels is decreased to improve display resolution, then more pixels can be fitted on the screen, but light scattering and intermixing effects become stronger
Solution Approach 1:
By segmenting each pixel into multiple spatially separated light-emitting regions with dedicated electrical contacts, the invention enables finer spatial sampling. This segmentation allows the display to achieve higher resolution by reducing the effective pitch between controllable elements, while the physical separation of converters in each region minimizes intermixing even at small scales.
Solution Approach 2:
The invention introduces intermediate structures including reflective layers between adjacent LED structures, insulating layers separating different components, and carefully designed electrical contact structures. These intermediary elements prevent optical and electrical cross-talk between adjacent regions, allowing high-density pixel arrangements without suffering from scattering and intermixing effects.
3Measurement precision
If different types of materials are used for each sub-pixel LED structure to achieve different emission wavelengths, then color accuracy is improved, but fabrication complexity increases significantly
Solution Approach 1:
The invention maintains consistent material composition across all LED structures but achieves different emission wavelengths by changing structural parameters: varying the thickness of quantum well layers, adjusting the bandgap through compositional ratios in alloy layers, and modifying the depth and configuration of heterostructure interfaces. This parameter-based tuning preserves material uniformity while achieving precise wavelength control.
Solution Approach 2:
By segmenting the color control function into separate radiation converter components rather than requiring different LED materials, the invention simplifies fabrication. All LED structures can be grown using the same material system and process, while color differentiation is achieved through post-growth converter attachment, dramatically reducing fabrication complexity compared to growing different semiconductor materials for each color.
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 enables precise control over the wavelength of light emitted by each sub-pixel, enhancing the color purity and spatial resolution of display screens, even at smaller dimensions, by reducing the risk of intermixing and scattering, and allowing for efficient conversion of radiation.
Implementation Method 1
radiation converters are placed onto the surface of the LED structure in order to convert the light emitted by the portion of the structure underneath the converter into a light having a different wavelength from the light originally emitted by the layer
Data Source
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AI summary
The present invention concerns an emitting device (15) comprising : - a first light emitter (30) adapted to emit a first radiation and comprising at least one first semiconducting structure comprising a first semiconducting layer adapted to emit the first radiation, - a second light emitter (35) adapted to emit a second radiation different from the first radiation, the second light emitter (35) comprising at least one second semiconducting structure comprising a second semiconducting layer adapted to emit the second radiation, and - a third light emitter (40A, 40B) adapted to emit a third radiation different from the second and first radiations, the third light emitter (40A, 40 B) comprising at least one third semiconducting layer adapted to emit a fourth radiation different from the third radiation, the third light emitter (40A, 40B) further comprising a radiation converter (80) configured to convert the fourth radiation into the third radiation.