Display Device Color Filter Spectral Tuning for Wide Gamut
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Solution Overview
Problem
Display devices struggle to achieve high color gamut coverage beyond 99% of the standard RGB (sRGB) color gamut, which is essential for enhanced color reproduction, especially as their applications expand beyond monitors and televisions.
Innovation Solution
A display device incorporating a light-emitting device that emits white light with specific chromaticity coordinates and a patterned color filter layer with tailored red, green, and blue filters, optimizing transmittance spectra to convert white light into red, green, and blue light, thereby enhancing color reproduction and achieving over 99% sRGB color gamut coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light sources and color filters are used, then the display device can be manufactured with standard components, but the color gamut coverage is limited and cannot exceed 99% of sRGB
Solution Approach 1:
The patent changes the spectral parameters of the light source by using a quantum dot layer excited by blue LED to generate narrow-band green light, and by selecting specific phosphors for yellow light generation. This parameter change in the light source spectrum enables the color filters to achieve higher color purity and extends the color gamut coverage beyond 99% of sRGB while maintaining manufacturability through established quantum dot and phosphor technologies.
Solution Approach 2:
The patent employs composite material structures including quantum dot layers combined with phosphor materials to create a multi-component light emission system. The quantum dots (e.g., CdSe, CdTe) are composite nanomaterials with size-tunable bandgaps, and when combined with phosphors like Y3Al5O12:Ce, they create a composite light source that provides both narrow-band green and broad-spectrum yellow emission, enabling superior color gamut performance.
2Manufacturing precision
If the color gamut is enhanced to cover more than 99% of sRGB, then the color reproduction is improved, but the matching conditions of light source spectrum and color filter transmittance become more stringent and difficult to achieve
Solution Approach 1:
The patent segments the white light generation into distinct spectral components: blue LED provides the excitation source, quantum dots convert a portion to narrow-band green light, and phosphors convert another portion to yellow light. This segmentation of the light emission process into discrete spectral bands simplifies the overall spectrum matching requirement, as each component has a well-defined emission profile that can be independently optimized and combined to achieve the desired color gamut.
3Ease of manufacture
If standard color filters are used, then the manufacturing process is simple, but the color reproduction capability is limited
Solution Approach 1:
The patent changes the transmittance spectrum parameters of the color filters by designing them to match the narrow-band green and yellow emission peaks from the quantum dot-phosphor composite light source. This parameter optimization of the color filters, combined with the improved light source spectrum, enables superior color reproduction quality with maintained manufacturing simplicity through conventional filter fabrication techniques.
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 enables the display device to provide images with a color gamut exceeding 99% of the sRGB color gamut, significantly improving color reproduction and meeting the increasing demands for larger color gamut in modern display technologies.
Implementation Method 1
at least one light-emitting device configured to provide a white light
Implementation Method 2
a patterned color filter layer... with red, green, and blue filters, each with defined transmittance spectra
Data Source
AI summary
A display device includes at least one light-emitting device and a patterned color filter layer. The light-emitting device is used to provide a white light having a white point chromaticity coordinate (Wx, Wy) where 0.23<Wx<0.27, 0.22<Wy<0.25. The patterned color filter layer includes a red color filter, a green color filter and a blue color filter. Peaks of transmittance spectrums of the red color filter, the green color filter, and the blue color filter are respectively between 720 nm and 780 nm, between 534±2 nm, and between 449±2 nm. Intensities of the peaks of the transmittance spectrums of the red color filter, the green color filter, and the blue color filter are respectively between 0.95 and 1, between 0.88 and 0.91, and between 0.83 and 0.87.