Composite Cavity Up-Conversion for Display Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies, such as LCDs, face challenges with low efficiency in up-converting infrared light to visible light, limited viewing angles, poor contrast, and high power consumption, making them unsuitable for high-resolution and low-light environments.
Innovation Solution
The development of up-converting materials placed within a composite cavity that enhances the absorption and emission of infrared light to visible light, utilizing resonant cavity light emitting diodes (RCLEDs) and up-converters to create high-resolution, compact, and high-brightness display chips for virtual reality and 3D imaging applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LCDs are used for display, then low power consumption is achieved, but viewing angle and contrast are limited
Solution Approach 1:
The patent changes the fundamental operating parameters by using up-conversion materials that convert infrared light to visible light, replacing the traditional LCD liquid crystal modulation approach. This parameter change enables wide viewing angles and high contrast while maintaining low power consumption, as the up-conversion process is highly efficient and the infrared LEDs operate at low power.
Solution Approach 2:
The patent employs composite materials consisting of up-conversion phosphors combined with infrared LEDs. The up-conversion phosphors contain multiple rare earth elements (e.g., Yb3+, Er3+, Tm3+) that work together to convert infrared wavelengths to visible red, green, and blue light. This composite material approach enables the display to achieve both energy efficiency and superior optical performance.
2Productivity
If up-conversion materials are used to convert infrared to visible light, then display efficiency is improved, but up-conversion efficiency is initially limited
Solution Approach 1:
The patent optimizes up-conversion efficiency by carefully selecting and combining multiple rare earth phosphor materials with specific emission characteristics. By adjusting the composition ratios and particle size distributions of the phosphors, the system achieves high conversion efficiency from infrared to visible light across the entire RGB spectrum, minimizing energy loss.
Solution Approach 2:
The patent dynamically adjusts the infrared LED wavelengths and intensities to match the absorption characteristics of the up-conversion phosphors. By using multiple infrared LEDs with different wavelengths (e.g., 808nm, 980nm, 1064nm) and optimizing their drive currents, the system maximizes the absorption of infrared light by the phosphors, thereby improving overall up-conversion efficiency.
3Manufacturing precision
If nanometer sized particles are used for up-conversion, then display resolution is improved, but handling and dispersion difficulty increases
Solution Approach 1:
The patent encapsulates the nanometer-sized up-conversion phosphor particles in transparent polymer matrices or thin film structures. This encapsulation protects the delicate nanoparticles from aggregation and damage during handling, while the transparent matrix allows the converted visible light to pass through to the display elements. The thin film structure enables precise positioning and integration into the display device.
Solution Approach 2:
The patent uses transparent binding agents and dispersion media as intermediaries to facilitate the handling and uniform distribution of nanometer-sized phosphor particles. These intermediaries prevent particle aggregation, enable homogeneous mixing, and allow the nanoparticles to be processed using conventional display manufacturing techniques such as spin-coating, dip-coating, or inkjet printing.
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 solution significantly improves the efficiency and brightness of displays, enabling high-resolution, low-power consumption, and wide viewing angles, suitable for virtual reality and augmented reality applications, including head-mounted displays with long battery life.
Implementation Method 1
The configuration of the resonant composite cavity is such that the absorption of the incident pump light can be greatly enhanced through multiple passes and field interference
Implementation Method 2
up-conversion based displays including headset displays for virtual reality and three-dimensional imaging... up-converting materials that absorbs infrared light and emits visible light
Implementation Method 3
The Hunter patents describe liquid crystal displays that require arranging individual pixels in rows and corresponding columns... resonant cavity light emitting diodes (RCLEDs)
Data Source
AI summary
Methods, apparatus and systems for an up-converter resonant cavity light emitting diode device includes a semiconductor light source, an up-converter to form the light emitter with up-converting materials and an electrical source coupled with the semiconductor light source for providing electrical energy to the semiconductor light source to provide a desired wavelength emitted light. The semiconductor light source is a resonant cavity light emitting diode or laser that emits an approximately 975 nm wavelength to provide electrical and optical confinement to the semiconductor light source to form a resonant cavity up-converting light emitting diode (UC/RCLED). Rows and columns of electrodes provide active matrix addressing of plural sets of UC/RCLEDs for display devices. The up-converter resonant cavity light emitting diode device has applications in head mounted projection display optical system using spectrally selective beam splitters to eliminate spectral overlap between colors and to combine the red, green and blue beams.