Backlighting Device Using Quantum Dots for Low Power
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Solution Overview
Problem
Existing backlighting solutions for portable electronic devices, such as LEDs, consume high power and require complex light guide designs, while failing to efficiently achieve the desired wavelength and brightness with minimal power consumption.
Innovation Solution
The use of electroluminescent lamps emitting in the UV or blue spectrum to activate free-standing quantum dots, combined with optional filters and scattering particles, allows for selective tailoring of color and brightness, reducing power consumption and enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diodes are used for backlighting, then illumination intensity is improved, but use of energy increases
Solution Approach 1:
The patent changes the fundamental parameters of the light emission process by using quantum dots with specific size-controlled bandgaps to convert UV/blue light into precise visible wavelengths. This parameter change enables more efficient light conversion and reduces power consumption while maintaining high luminance output.
Solution Approach 2:
The invention employs composite material structures combining UV/blue light sources with quantum dot layers of specific compositions and sizes. These composite materials achieve superior light conversion efficiency and wavelength precision compared to conventional LEDs, reducing energy consumption while maintaining high illumination intensity.
2Illumination intensity
If conventional backlighting methods are used, then illumination intensity is achieved, but manufacturing precision is worsened due to complex light guide designs
Solution Approach 1:
The patent applies local quality by using quantum dots with specifically controlled local properties (size, composition, distribution) to achieve precise wavelength emission. Each quantum dot layer is engineered with specific characteristics to emit at exact wavelengths, eliminating the need for complex light guide designs and improving manufacturing precision.
3Device complexity
If simple icon display is used, then device complexity is reduced, but adaptability is worsened
Solution Approach 1:
The invention achieves universality by creating a backlighting system that can generate multiple colors and wavelengths using quantum dots of different sizes and compositions. The same basic structure can be adapted to produce various colors by simply changing the quantum dot parameters, providing high adaptability without increasing device 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
This approach provides efficient, low-power backlighting with precise wavelength control and enhanced brightness, improving the visual appeal and functionality of electronic devices while minimizing energy usage.
Implementation Method 1
an electroluminescent (EL) lamp provides light preferably in the blue spectrum to activate free standing quantum dots (FSQDs)
Implementation Method 2
quantum dots (FSQDs) that provide light having a predetermined and specific wavelength
Implementation Method 3
a filter is positioned over the light emitting particles to block the light emitted from the light emitting source
Implementation Method 4
a layer of scattering particles are positioned over the light emitting particles for enabling selective tailoring of color and brightness
Data Source
AI summary
A backlighting device (300, 400, 500, 600) emitting light having a first wavelength includes a first radiation emission device (302), e.g., an electroluminescent lamp, for emitting radiation having a second wavelength. A layer (306) of a plurality of photon emitting particles (308), e.g., free standing quantum dots or phosphorus particles, emits light having the first wavelength in response to the first radiation emission device (302), the first wavelength being larger than the second wavelength. A transparent material (116, 120, 122) overlies the layer of a plurality of photon emitting particles (308), wherein the light having a first wavelength passes through the transparent material (116, 120, 122). Optionally, a filter (402) may be placed over the layer (306) to block the radiation having a second wavelength, and a scattering layer (604) may be placed over the layer (306) to scatter wavelength other than the first wavelength.