Glare Reduction Panel with Liquid Crystal Layer and End Polarizer
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Solution Overview
Problem
Existing glare reduction systems for rear-view mirrors in vehicles either result in poor detail in shadows due to averaging light intensity or cause white-blotting in camera-based systems, leading to limited application and high costs due to digital processing requirements.
Innovation Solution
A glare reduction panel with a liquid crystal layer and an end polarizer, positioned anteriorly to the display device, which receives an input signal to manipulate light intensity and orientation, allowing spatial and selective glare reduction without loss of detail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If photosensitive materials such as electro-chromic glass are used to control light from rear-view mirrors, then glare is reduced, but detail in shadows deteriorates due to averaging light intensity across the entire viewing surface
Solution Approach 1:
The mirror surface is divided into multiple independently controllable segments or pixels. Each segment can be individually dimmed based on local glare conditions rather than treating the entire mirror surface uniformly. This allows glare reduction in specific areas while preserving visibility and detail in other areas, particularly in shadow regions.
Solution Approach 2:
Different regions of the mirror are treated with different levels of dimming or light control based on local conditions. The system applies spatially varying properties to different parts of the mirror surface, allowing each region to have optimal characteristics for its specific function (glare reduction where needed, detail preservation where needed).
2Illumination intensity
If camera-based rear-view mirrors with ultra-sensitive CMOS sensors are used, then visibility is improved, but white-blotting occurs in the display when light hits the cameras
Solution Approach 1:
A polarizing filter or beam splitter is introduced as an intermediary between the camera and the display. This intermediary component selectively transmits or blocks light based on polarization angles, allowing the camera to capture images while preventing excessive light from reaching the display and causing white-blotting. The intermediary mediates between the light source and the sensitive sensor/display.
Solution Approach 2:
The system changes the polarization state of light using polarizing filters at specific angles. By controlling the polarization parameters of light passing through the system, the camera can operate effectively while the display is protected from overwhelming light that would cause white-blotting artifacts.
3Object-affected harmful factors
If digital processing is used to achieve enhanced glare-free images, then glare reduction is improved, but device complexity and cost increase
Solution Approach 1:
The system replaces complex digital processing and computation with simple optical elements such as polarizing filters and beam splitters. These passive optical components perform glare reduction through their physical properties rather than requiring active digital processing, thereby reducing device complexity, power consumption, and cost while achieving effective glare mitigation.
4Object-affected harmful factors
If opacity blocking is attempted to reduce glare for one eye, then glare is reduced for that eye, but visibility is hindered for the other eye due to the small mirror area
Solution Approach 1:
The mirror is divided into separate segments or zones that can be independently controlled for each eye. This allows glare reduction measures to be applied selectively to the portion of the mirror viewed by one eye without affecting the visibility for the other eye. Each eye receives optimized light control tailored to its specific needs.
Solution Approach 2:
Different regions of the mirror are assigned different optical properties or dimming levels according to which eye views them. The left side of the mirror may be optimized for the left eye while the right side is optimized for the right eye, allowing each eye to have optimal glare reduction without compromising the other eye's visibility.
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 reduces glare while maintaining image clarity, enhancing visibility in bright conditions and reducing eye irritation, suitable for various driving applications and other scenarios with intense light sources.
Implementation Method 1
a liquid crystal layer configured to receive the input signal
Implementation Method 2
an end polarizer with an axis of transmission relative to an angle of transmission of a second polarizer of the display device
Data Source
AI summary
A glare reduction system is provided for glare reduction. The glare reduction system includes an imaging source configured to receive light from an object, and a display driver configured to process the received light to generate an input signal. The glare reduction system further includes a display device configured to receive the input signal. A glare reduction panel is positioned anteriorly to the display device. The glare reduction panel including a liquid crystal layer configured to receive the input signal and an end polarizer with an axis of transmission relative to an angle of transmission of a second polarizer of the display device.