Emitting Device Subpixel Radiation Converter Positioning
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Solution Overview
Problem
The challenge in manufacturing display screens with sub-pixels emitting different colors is the difficulty in controlling the wavelength of light emission, particularly due to the inefficiencies in semiconductor light-emitting diode (LED) structures and the complexity of placing radiation converters, which can lead to undesirable color mixing and reduced spatial resolution.
Innovation Solution
A transmitter device comprising a substrate with multiple light emitters, including natural color and converted light emitters, where the radiation converters are precisely positioned using techniques such as grafting and embedding in a resin to control the emission wavelengths, and walls are used to prevent crosstalk between emitters, allowing for improved control over the emitted colors and increased spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radiation converters are placed on the LED structure surface to convert light wavelength, then color diversity of sub-pixels is improved, but positioning precision deteriorates due to light diffusion and mixing
Solution Approach 1:
The invention divides the radiation converter into multiple independent converters, each positioned above a specific semiconductor structure. Each converter is independently patterned and positioned, preventing mixing between adjacent converters and enabling precise wavelength control for each sub-pixel while maintaining color diversity
Solution Approach 2:
The invention applies different radiation converters with specific wavelength conversion properties to different local regions (sub-pixels) of the display. Each converter is tailored to convert the blue LED emission to a specific color (red, green, yellow), allowing precise local control of emission wavelength while maintaining manufacturing precision
2Manufacturing precision
If spatial period between pixels is decreased to increase resolution, then spatial resolution is improved, but color mixing increases due to light diffusion
Solution Approach 1:
By segmenting the radiation conversion function into multiple independent converters positioned above individual semiconductor structures, the invention eliminates lateral light diffusion between adjacent pixels. Each converter operates independently, preventing color mixing even when pixels are closely spaced, thus enabling high spatial resolution
Solution Approach 2:
The invention introduces a patterned radiation converter layer as an intermediary between the blue LED emission and the final displayed color. This converter layer acts as a spatial filter that converts wavelength locally without lateral diffusion, preventing color mixing while maintaining high spatial resolution
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 wavelengths emitted by each sub-pixel, enhancing the color accuracy and spatial resolution of display screens by reducing the risk of color mixing and improving the manufacturing precision of the radiation converters.
Implementation Method 1
radiation converters, so that by selectively supplying electric current to the area under each separate converter, the light emitted by the layer or layers semiconductors is converted into light with a specific color
Data Source
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AI summary
The invention relates to an emitting device (15) comprising: a first light emitter (40A) which can emit a first radiation; and a second light emitter (40B) which can emit a second radiation, different from the first. The first light emitter (40A) comprises a first semiconductor structure and a first radiation converter (80), and the second light emitter (40B) comprises a second semiconductor structure and a second radiation converter (80). Each semiconductor structure comprises a semiconductor layer which can emit a third radiation. Each radiation converter (80) comprises a set of particles configured to convert the third radiation into the first radiation or the second radiation, the particles of the first radiation converter (80) being affixed to a surface by a mass of photosensitive resin and the particles of the second radiation converter (80) being affixed to a surface by means of grafting.