Quantum Dot Display Sub-Pixels for High Color Gamut
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technology faces limitations in achieving large-screen outdoor displays due to the narrow color gamut resulting from the wide emission spectrum of light emitting diode (LED) chip arrays, which restricts the size and color accuracy of outdoor displays.
Innovation Solution
A display device comprising a substrate with multiple display units, each containing isolating channels with quantum dot materials and light sources to produce specific colors, such as red, green, and blue, using nanoparticles like CuInSe, InP, CuInS, ZnS, or CdS, which are stimulated by corresponding light sources to achieve high color gamut and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If LED chip array displays are used for outdoor large-screen displays, then the display size can be increased, but the color gamut becomes narrow due to wide emission spectrum
Solution Approach 1:
The patent segments the display into multiple sub-pixels, each containing quantum dot materials with specific size ranges that emit different wavelengths. This segmentation allows precise control over emission spectra for each color channel, thereby expanding the overall color gamut while maintaining large display size.
Solution Approach 2:
Different regions of the display (different sub-pixels) use quantum dot materials with locally optimized properties - specifically, quantum dots of different size ranges are placed in different sub-pixels to emit different wavelengths. This local quality differentiation enables precise color control and expanded color gamut across the large display area.
2Ease of manufacture
If conventional LCD fabricating process is used, then manufacturing is simplified, but the display size is limited
Solution Approach 1:
The patent merges the quantum dot material deposition process with existing thin-film transistor fabrication processes. By integrating quantum dot inkjet printing or coating into the standard LCD manufacturing workflow, the display size can be extended beyond conventional limits while maintaining manufacturing simplicity.
Solution Approach 2:
The quantum dot materials serve multiple functions: they act as color filters, light converters, and color definition elements simultaneously. This multi-functionality allows the display to achieve large size with enhanced color gamut using modified but not entirely new manufacturing processes.
3Manufacturing precision
If quantum dot materials with different size ranges are used, then color gamut is expanded, but manufacturing complexity increases
Solution Approach 1:
The patent uses inkjet printing technology as an intermediary method to deposit quantum dot materials with different size ranges onto specific sub-pixel regions. This intermediary process enables precise placement of different quantum dot materials without requiring complex multi-step fabrication, thereby expanding color gamut while controlling manufacturing 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
The solution provides a high color gamut display with improved contrast and low power consumption by using quantum dots to produce specific colors, overcoming the limitations of conventional LCDs in achieving large-screen outdoor displays with accurate color representation.
Implementation Method 1
each of the plurality of first color sub-pixels can provide a first color light by stimulating the first quantum dot material with one corresponding light source... each of the plurality of second color sub-pixels can provide a second color light by stimulating the second quantum dot material with one corresponding light source
Data Source
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AI summary
A display device and a fabricating method thereof are provided. The display device comprises a substrate and a plurality of display units on the substrate, wherein each of the plurality of display units comprises a first color sub-pixel and a second color sub-pixel. The first color sub-pixel comprises a first quantum dot material and a first light source, and is configured to provide a first color light by stimulating the first quantum dot material with the first light source. The second color sub-pixel comprises a second quantum dot material and a second light source, and is configured to provide a second color light by stimulating the second quantum dot material with the second light source.