HUD Integrator Array for Uniform Backlighting
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Solution Overview
Problem
Traditional HUD systems for motor vehicles face challenges in providing spatially uniform and angularly focused backlighting for liquid crystal displays, which is essential for maintaining driver visibility of both the display and the road without diverting their gaze.
Innovation Solution
The system employs an integrator array with columns and optical receptors, utilizing total internal reflection to collimate light rays and create virtual light sources, ensuring uniform and focused backlighting for the liquid crystal display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional backlighting systems are used for HUD, then the structure is simple, but the light cannot be sufficiently concentrated or focused to provide adequate brightness at distance
Solution Approach 1:
The backlighting system is segmented into multiple independent light sources arranged in an array, with each source having associated optical elements (lenses, reflectors, diffusers). This segmentation allows each element to be optimized for specific light control functions while collectively achieving the required brightness and uniformity for HUD application.
Solution Approach 2:
Optical intermediaries including lenses, reflectors, and diffusers are introduced between the light sources and the HUD display. These intermediary elements manipulate light paths to concentrate and focus light rays, achieving the necessary brightness concentration without requiring the light sources themselves to be overly complex.
2Illumination intensity
If light sources are positioned to provide sufficient brightness, then illumination intensity is adequate, but spatial uniformity of illumination is poor
Solution Approach 1:
Different regions of the backlighting array are designed with locally optimized characteristics. Light sources in different positions have tailored optical elements that direct light appropriately for their specific location, ensuring that each local area contributes to uniform overall illumination while maintaining adequate brightness.
Solution Approach 2:
The optical parameters (focal length, aperture, reflectivity) of the optical elements are varied across the array to compensate for position-dependent illumination variations. By changing these parameters locally, the system achieves both sufficient brightness and spatial uniformity simultaneously.
3Illumination intensity
If light rays are collimated for angular focus, then angular focus is achieved, but light loss increases
Solution Approach 1:
The system converts potentially lost light (rays that would miss the LCD or travel at unwanted angles) into useful collimated light through reflective and refractive optical elements. What would otherwise be wasted light is redirected and collimated to contribute to the focused illumination, thereby reducing energy loss while achieving angular focus.
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 provides high brightness and uniform illumination to the HUD, allowing drivers to view critical vehicle information without eye diversion, enhancing safety by maintaining focus on the road.
Implementation Method 1
Some of the plurality of light rays from the at least one light source can have an angle big enough to miss the inner lens, and can be totally internally reflected by the angled side wall and plurality of walls and in this process can be collimated
Implementation Method 2
Some of the plurality of light rays from the at least one light source can have a small angle relative to the main optical axis, and can be collimated by the inner lens
Data Source
AI summary
An system for providing uniform and focused backlighting to a liquid crystal display (LCD) can be provided. The system can include at least one light source that emits light rays. The system can include at least one column having a first end positioned adjacent to the at least one light source, a second end adapted to be positioned adjacent to the LCD and a plurality of walls. The system can include an optical receptor coupled to the first end of the at least one column, which can include an angled side wall that can be coupled to the walls of the at least one column. The light rays from the at least one light source can be totally internally reflected by the angled side wall and walls to create at least one virtual light source to backlight the LCD.