Low-Blue Display Spectrum Using Violet-Pumped Color Mixing
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Solution Overview
Problem
Existing display technologies face challenges in achieving a blue-free emission while maintaining a good color gamut and efficiency, as blue radiation is crucial for exciting wavelength-converting materials and impacts the color gamut and circadian cycle.
Innovation Solution
Incorporating a violet light source with blue-selective wavelength-converting materials that absorb violet light efficiently, allowing the combination of violet and longer-wavelength light to create a perceptually blue emission without substantial blue radiation, and using quantum dots with violet-pump LEDs to reduce toxic material loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If blue light is used in display, then color gamut and efficiency are improved, but impact on circadian cycle increases
Solution Approach 1:
The patent extracts and removes the harmful blue light component (440-500nm) from the display spectrum while retaining violet light (380-440nm) and longer wavelengths. This is achieved through selective emission from the light source and/or filtering to eliminate blue light, thereby reducing circadian impact while maintaining display performance through compensation with other wavelength components.
Solution Approach 2:
The patent changes the spectral parameters of the display by shifting emphasis from blue light to violet light and longer wavelengths. The spectral power distribution is modified to have enhanced violet content and reduced blue content, with the violet-to-blue power ratio increased to at least 1:1, fundamentally altering the light emission characteristics to achieve circadian-friendly display.
2Object-generated harmful factors
If violet light source is used with blue-selective wavelength-converting materials, then blue-free emission is achieved, but excitation efficiency may be reduced
Solution Approach 1:
The patent introduces quantum dots as intermediary wavelength-converting materials that absorb violet light and convert it to blue light, which is then selectively removed. Alternatively, quantum dots convert violet light directly to green light, eliminating the need for blue light entirely. This intermediary conversion approach enables precise spectral control to achieve blue-free emission while maintaining high conversion efficiency through optimized quantum dot selection and placement.
3Object-affected harmful factors
If blue light is removed from display, then circadian impact is reduced, but color gamut may be compromised
Solution Approach 1:
The patent merges violet light (380-440nm) with longer wavelength light (green and red) to create a perceptually blue emission without substantial blue radiation. The human visual system perceives this combination as blue due to the way cone cells respond to these wavelengths, allowing the display to maintain blue color appearance and gamut while actually emitting minimal blue light, thus preserving color quality while reducing circadian impact.
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 achieves a blue-free display with a high color gamut and efficient performance, meeting regulatory standards and reducing the impact on the human circadian cycle.
Implementation Method 1
a light source for emitting a source light... the filter is configured to transmit short-primary light from the source light
Implementation Method 2
a filter positioned in the path of the source light, the filter comprising at least short, medium and long filters
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A display for emitting display light comprising: (a) a light source for emitting a source light; and (b) a filter positioned in the path of said source light, said filter comprising at least short, medium and long filters, wherein said short filter is configured to transmit short-primary light from said source light, said short-primary light comprising a violet portion having wavelengths from 400 to 440 nm and at least a second portion having wavelengths above 440 nm such that said short-primary light is perceptually blue, said short-primary light having a short-primary SPD having a short-primary power between 380-780nm and a blue power between 440-500nm,wherein said blue power is less than 5% of said short-primary power.