Virtual Image Projection Screen Solar Radiation Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Head-up display systems used in augmented reality devices, such as virtual reality helmets and windshield projections, face overheating issues due to solar radiation, leading to distorted color transmission and potential display damage, with existing solutions like fan systems and water cooling being bulky, noisy, or complex.
Innovation Solution
A system comprising a polarizing filter, a selective dichroic filter, and mirrors is used to polarize and filter solar radiation, transmitting only the necessary wavelengths to the display while reflecting or absorbing harmful ultraviolet and infrared components, thereby reducing thermal overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fan systems are used to cool the display, then the display temperature is reduced, but the device becomes bulky and noisy
Solution Approach 1:
The harmful solar radiation is extracted and removed from the optical path before reaching the display. The polarizing filter and selective dichroic filter selectively remove harmful wavelengths (UV, IR, and polarized visible light) while allowing necessary display wavelengths to pass through, preventing heat generation at the display rather than cooling it afterward
Solution Approach 2:
Optical filters serve as intermediaries between the solar radiation and the display. The polarizing filter and selective dichroic filter act as mediators that selectively interact with different wavelength components of solar radiation, blocking harmful portions while allowing beneficial wavelengths to reach the display
2Temperature
If water cooling solutions are used, then the display temperature is reduced, but the system becomes complex and expensive
Solution Approach 1:
The harmful solar radiation is extracted and removed from the optical path before reaching the display. The polarizing filter and selective dichroic filter selectively remove harmful wavelengths (UV, IR, and polarized visible light) while allowing necessary display wavelengths to pass through, preventing heat generation at the display rather than cooling it afterward
Solution Approach 2:
The mechanical cooling systems (fans and water cooling) are replaced with an optical filtering system. Instead of using mechanical means to remove heat after generation, the invention uses optical filters to prevent harmful radiation from reaching the display in the first place, eliminating the need for complex mechanical cooling infrastructure
3Temperature
If backlight illumination is lowered to reduce temperature, then the display temperature decreases, but the system usage is limited
Solution Approach 1:
The invention converts the harmful solar radiation into a manageable problem by selectively filtering it. The polarizing filter and selective dichroic filter transform the harmful multi-wavelength solar radiation into a controlled situation where only beneficial wavelengths reach the display, allowing the display to operate at full backlight illumination without overheating
Solution Approach 2:
The invention changes the spectral parameters of the radiation reaching the display. By using wavelength-selective filtering, the system modifies the spectral composition of solar radiation to exclude harmful UV, IR, and polarized visible wavelengths while preserving the wavelengths needed for display operation, allowing full backlight performance
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 system effectively minimizes solar radiation impact on the display, preventing overheating and image distortion, and is more compact and cost-effective compared to existing solutions.
Implementation Method 1
the polarizing filter is configured to polarize solar radiation transmitted through the screen and incident on the polarizing filter
Implementation Method 2
the selective dichroic filter is configured to transmit at least one of radiation of an operating range of the display among the radiation polarized by the polarizing filter, an ultraviolet component of the radiation, and an infrared component of the radiation, and to reflect remaining radiation
Implementation Method 3
the first mirror is configured to reflect radiation transmitted through the selective dichroic filter to the second mirror
Implementation Method 4
the second mirror is configured to transmit or absorb at least one of an ultraviolet component of the radiation and an infrared component of the radiation reflected from the first mirror
Data Source
AI summary
Provided is a system of projection of a virtual image on a screen with the effect of eliminating the influence of solar radiation, the system that polarizes solar radiation in an optical path along which solar radiation is delivered to a display through a screen, eliminates and filters out ultraviolet and infrared components, and transmits only radiation of an operating range of the display to the display.