HUD Illumination Device Reflector Segmentation
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Solution Overview
Problem
Head-up displays (HUDs) face challenges in increasing brightness and reducing power consumption and heat generation due to the low reflectance of the reflective surface in the backlight's reflector, which affects the directivity of the light beam.
Innovation Solution
The illumination device incorporates a reflector with a light source module and reflective surfaces formed by combining curved surfaces, optimizing the radii of curvature to enhance directivity and uniformity of light emission, and using a diffusion sheet to project light with high directivity to the liquid crystal display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflector height is increased to improve directivity, then light directivity and brightness are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The reflector is divided into multiple reflective surfaces (first reflective surface and second reflective surface) positioned at different heights. The first reflective surface is disposed at a first height from the light source, and the second reflective surface is disposed at a second height from the light source, with the first height being different from the second height. This segmentation allows each surface to contribute differently to light directionality without requiring a single complex high-structure reflector.
Solution Approach 2:
Different portions of the reflector are assigned different functions through local quality differentiation. The first reflective surface and second reflective surface are positioned at different heights to create different light reflection paths. This allows specific regions to optimize for different aspects of light control, achieving overall improved directivity without uniform increase in structure complexity throughout the entire reflector.
2Illumination intensity
If the reflective surface reflectance is increased to reduce light loss, then brightness is improved, but heat generation from the light source increases
Solution Approach 1:
The reflector is segmented into multiple reflective surfaces at different heights, allowing selective optimization of each surface's reflectance. This segmentation enables better control over which portions of the light source are reflected, improving brightness efficiency while allowing heat management through strategic positioning and selection of reflective materials at different locations.
Solution Approach 2:
Different reflective surfaces are assigned different reflectance characteristics based on their specific positions and functions. The first reflective surface and second reflective surface can utilize materials with optimized reflectance properties suited to their specific roles, allowing local optimization of light reflection efficiency without uniformly maximizing reflectance everywhere, thereby managing heat generation.
3Use of energy by moving object
If the reflector height is increased to improve directivity, then power consumption is reduced, but the device size increases
Solution Approach 1:
Instead of using a single tall reflector structure, the system segments the reflection function across multiple surfaces at different heights. This allows achieving improved directivity and reduced power consumption through optimized light paths while avoiding the need for a single proportionally large reflector height, thus controlling overall device size.
Solution Approach 2:
The reflector design transitions from a single-dimensional height optimization to a multi-dimensional arrangement with reflective surfaces at different heights and positions. This dimensional approach allows improved light directivity and energy efficiency without proportionally increasing the overall device footprint or height, as the reflective surfaces are distributed in three-dimensional space rather than concentrated at a single height.
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 configuration improves the efficiency and brightness of the HUD by converting Lambertian emission into a square pyramid emission profile, reducing power consumption, and minimizing heat generation through 2D local dimming drive, while maintaining high contrast and sharp image display.
Implementation Method 1
a reflector opposed to the light source module. The reflector comprises a plurality of incidence openings on which light from the light sources is made incident, a plurality of emission openings opposed to the incidence openings, and a plurality of reflective surfaces extending from the incidence openings to the emission openings, respectively
Implementation Method 2
using a diffusion sheet to project light with high directivity to the liquid crystal display panel
Data Source
AI summary
According to one embodiment, an illumination device includes a light source module including a plurality of light sources, and a reflector opposed to the light source module. The reflector includes a plurality of incidence openings on which light from the light sources is made incident, a plurality of emission openings opposed to the incidence openings, and a plurality of reflective surfaces extending from the incidence openings to the emission openings, respectively. Each of the reflective surfaces is formed by combining a plurality of curved surfaces arranged in an optical axis direction of the light sources.