Vehicle Headlight Polarization Control for Uniform Illumination
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Solution Overview
Problem
Conventional vehicle headlight devices using LED light sources suffer from insufficient light use efficiency and non-uniform lighting characteristics, and lack effective control over polarization components for improved visibility on road surfaces.
Innovation Solution
A vehicle headlight device incorporating a light source device with a polarization direction conversion mechanism, utilizing a TN LCD panel to control the polarization direction of illumination light based on the road surface conditions, ensuring optimal light distribution and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED light sources are used in vehicle headlamps, then the light source provides small size, low power consumption, and long life, but the light use efficiency and uniform lighting characteristics are insufficient
Solution Approach 1:
The patent divides the illumination system into multiple LED arrays (first and second LED arrays) with separate optical paths and optical light guides. Each LED array illuminates different regions of the road surface, allowing independent optimization of light distribution patterns to improve overall light use efficiency while maintaining low power consumption
Solution Approach 2:
The patent implements region-specific illumination by directing different LED arrays to illuminate different road surface areas (e.g., near and far regions). This allows optimization of lighting characteristics for each specific region, improving uniformity and efficiency by matching light distribution to actual road surface needs rather than using a single uniform illumination pattern
2Duration of action of moving object
If conventional LED light sources are used in vehicle headlamps, then the light source provides small size, low power consumption, and long life, but the lighting uniformity is insufficient
Solution Approach 1:
The illumination system is segmented into multiple LED arrays and optical light guides that work together to create uniform lighting. By dividing the illumination task across multiple components with specialized functions, the system achieves uniform light distribution while maintaining the long operational life of individual LED components
Solution Approach 2:
The patent combines multiple LED arrays and optical light guides into an integrated illumination system. The first and second LED arrays with their respective optical guides are merged to produce complementary light distributions that, when combined, achieve uniform illumination across the road surface while preserving the durability and long life of the LED light sources
3Device complexity
If conventional headlight devices are used, then the structure is relatively simple, but there is no effective control over polarization components for improved visibility
Solution Approach 1:
The patent introduces a liquid crystal unit as an intermediary component between the LED light sources and the road surface. This liquid crystal unit acts as a polarization controller that can selectively modulate light based on road surface conditions (wet or dry), thereby improving visibility without requiring complete redesign of the entire headlight structure
Solution Approach 2:
The patent utilizes the ability of liquid crystal materials to change their optical properties (specifically polarization state) in response to applied voltage. By changing the polarization parameter of the light passing through the liquid crystal unit, the system can optimize visibility for different road conditions while maintaining a relatively simple overall device structure
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 solution provides a low-power, long-life, and environmentally friendly vehicle headlight with improved light use efficiency and uniform lighting, capable of adjusting polarization direction for enhanced visibility during driving.
Implementation Method 1
a non-modulation region capable of transmitting laser light and a modulation region which changes a phase of a polarization component of the laser light by 90 degrees are formed in the liquid crystal unit
Implementation Method 2
a vehicle lamp using a liquid crystal unit is disclosed
Data Source
AI summary
A vehicle headlight device attached to a part of a vehicle and configured to apply illumination light to a road surface on which the vehicle runs comprises: a light source device configured to Generate the illumination light; an optical unit disposed on a light axis of the light source device and configured to project the illumination light from the light source device so as to form a desired light distribution; and a polarization direction conversion device disposed in a part of a light path between the light source device and the optical unit and being able to control the illumination light from the light source device with inclusion of conversion of a polarization direction thereof for each irradiation region in accordance with a state of a position irradiated with the illumination light on the road surface.