Remote Phosphor Package with Red/Green Emitters to Reduce Light Loss
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Solution Overview
Problem
Conventional display devices waste a significant amount of light energy due to broad emission spectra of phosphors, leading to decreased brightness and higher operating temperatures, as most of the light produced is filtered out by color filters to achieve sharper color components.
Innovation Solution
Incorporation of a remote phosphor package comprising green emitting quantum dots and Mn4+ doped phosphors in a host matrix, separated from the primary light source, which efficiently converts blue light into targeted red and green light, reducing unnecessary light filtering and enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional phosphors with broad emission spectra are used, then color filters can produce color components, but a large amount of light energy is filtered out resulting in wasted light energy and decreased brightness
Solution Approach 1:
The patent changes the spectral parameters of the phosphor materials from broad emission spectra to narrow emission spectra. By using quantum dots with size-tuned narrow emission bands and selecting phosphors with sharp emission peaks, the system achieves better spectral matching with the color filters, reducing the amount of light blocked and improving overall brightness and energy efficiency
Solution Approach 2:
The patent employs a composite phosphor system combining quantum dots (with narrow, size-tunable emission spectra) and conventional phosphors (with sharp emission peaks). This composite approach allows optimization of both color purity and spectral matching with the color filter array, reducing wasted light energy while maintaining vibrant color display
2Temperature
If conventional phosphors with broad emission spectra are used, then color components can be produced, but display operating temperatures increase due to wasted light energy
Solution Approach 1:
By changing the emission spectral parameters to narrower bands that better match the color filter transmission windows, the system reduces the wavelength range where light is blocked. This decreases the conversion of light energy to heat, thereby lowering display operating temperatures and improving thermal management
Solution Approach 2:
The patent converts the previously harmful broad-spectrum emission (which caused heat generation through filtering) into a beneficial narrow-spectrum emission that aligns with color filter passbands. The light energy that would have been wasted as heat is now efficiently transmitted through the color filters, reducing thermal load while maintaining color output
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 remote phosphor package significantly reduces wasted light energy, improving energy efficiency and brightness by optimizing the use of primary light, thus reducing display operating temperatures and enhancing color gamut.
Implementation Method 1
a green emitting quantum dot material
Implementation Method 2
a Mn4+ doped phosphor of formula I
Data Source
AI summary
A remote phosphor package according to the present invention includes a green emitting quantum dot material and a Mn4+ doped phosphor of formula I, dispersed in a host matrixAx[MFy]:Mn4+ IwhereinA is Li, Na, K, Rb, Cs, or combinations thereof;M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or combinations thereof;x is an absolute value of a charge of the [MFy] ion; andy is 5, 6 or 7.