Backlight Reflector Wall Layout for Uniform HUD Illumination
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Solution Overview
Problem
Existing head-up display systems suffer from inefficiencies in backlighting devices due to light ray escape between the reflector and diffuser, leading to reduced efficiency and non-homogeneous illumination.
Innovation Solution
A reflector design with peripheral and internal walls forming cavities around light sources, where the internal walls extend further from the diffuser than the peripheral walls, confining light beams and ensuring homogeneous illumination while reducing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflector is positioned at a distance from the diffuser to ensure even illumination, then the homogeneity of illumination is improved, but light ray escape increases and efficiency decreases
Solution Approach 1:
The reflector is segmented into peripheral walls and internal walls with different heights. The peripheral walls extend to a confinement distance from the diffuser, while internal walls extend to a greater joint distance. This segmentation allows different regions of the reflector to perform different functions: peripheral walls confine light rays to prevent escape, while internal walls provide extended reflection paths for homogeneous illumination.
Solution Approach 2:
Different parts of the reflector are given different local qualities through varying wall heights. The peripheral walls are taller (extending to confinement distance) to maximize light confinement at the edges, while internal walls are shorter (extending to joint distance) to allow light distribution. This local differentiation resolves the contradiction between light confinement and homogeneous illumination.
2Loss of energy
If the reflector is positioned close to the diffuser to reduce light ray escape, then efficiency is improved, but illumination homogeneity deteriorates
Solution Approach 1:
The reflector structure is divided into peripheral and internal wall segments with different extension distances from the diffuser. This segmentation enables the peripheral walls to confine light effectively while internal walls maintain illumination homogeneity, achieving both goals simultaneously rather than requiring a uniform reflector position.
Solution Approach 2:
The solution moves from a single-dimensional positioning problem (uniform distance) to a multi-dimensional structure where wall height varies spatially. By introducing vertical dimensionality variation in wall heights, the system achieves both light confinement and homogeneous illumination that cannot be achieved with uniform positioning.
3Loss of energy
If light source intensity is increased to compensate for light loss, then illumination efficiency is maintained, but heat loss increases
Solution Approach 1:
The invention converts the potentially harmful effect of light ray escape into a beneficial structured reflection system. By designing peripheral and internal walls with specific geometries, escaped light rays are captured and redirected through multiple reflections, transforming light loss into useful illumination while maintaining lower light source intensity and reducing heat generation.
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 reflector design enhances lighting efficiency and homogeneity at the diffuser, allowing for reduced light source intensity and heat loss, while maintaining compactness and energy efficiency.
Implementation Method 1
a reflector comprising walls rising between the plurality of light sources and the diffuser, the walls forming cavities around the light sources so as to reflect at least part of the light beams towards the diffuser
Implementation Method 2
a diffuser extending in front of the plurality of light sources
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a backlighting device (3) for an image generator, comprising: - a plurality of light sources (10), designed to generate a light beam each; - a diffuser (20) extending so as to face the plurality of light sources; and - a reflector (30) comprising walls rising between the plurality of light sources and the diffuser, the walls forming cavities (31) around the light sources (10), wherein peripheral walls (32) extend at a containment distance (D1) from the diffuser, and wherein an inner wall (33) extends at a clearance distance (D2) from the diffuser, which clearance distance is greater than the containment distance. The invention also relates to an image generator.