HUD Picture Generator Layout for External Light and Image Uniformity
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Solution Overview
Problem
Head-up displays face issues with external light damaging internal components and causing non-uniform images due to the reflection of external light back to the driver's eye, especially when the LCD is not properly aligned with the optical axis.
Innovation Solution
The LCD is rotated to be offset from the incident optical axis, and an optical path control unit, potentially including a Fresnel lens, adjusts the light path to prevent damage and ensure uniform image distribution across the user's field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the LCD is rotated to prevent external light from entering the PGU, then external light damage is prevented, but the image becomes non-uniform due to varying distance from the light source
Solution Approach 1:
The LCD is rotated asymmetrically by a specific angle (e.g., 45 degrees) relative to the optical axis, creating an asymmetric configuration that deflects external light away from the PGU while maintaining proper light distribution through the optical path control unit
Solution Approach 2:
The optical path control unit acts as an intermediary between the light source and LCD, containing optical elements (lenses, mirrors, diffusers) that mediate the light path to ensure uniform illumination even when the LCD is rotated at an asymmetric angle
2Object-affected harmful factors
If the LCD is rotated to prevent reflected light from entering the driver's eye, then driver safety is improved, but image uniformity deteriorates due to non-uniform light distribution
Solution Approach 1:
The LCD is positioned at an asymmetric angle (e.g., 45 degrees) to the optical axis, which asymmetrically redirects reflected light away from the driver's line of sight while the optical path control unit compensates for illumination non-uniformity
Solution Approach 2:
The optical path control unit serves as a mediating system with optical elements that adjust and equalize light distribution to the rotated LCD, ensuring uniform image quality despite the asymmetric positioning
3Manufacturing precision
If the light source and LCD are arranged parallel to each other when offset from the optical axis, then image uniformity is maintained, but the light path becomes complex requiring additional optical components
Solution Approach 1:
The light source and LCD are arranged in a parallel configuration in a dimension offset from the optical axis (e.g., at 45 degrees), creating a new spatial arrangement that maintains uniform light distribution while managing the optical path through additional optical elements
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 effectively prevents external light from damaging components and ensures a uniform image is displayed to the driver, reducing the risk of image distortion and maintaining the driver's focus on the road.
Implementation Method 1
a lens that uniformly focuses light transmitted from the light source on the LCD, and a diffuser that evenly diffuses the light to the LCD
Implementation Method 2
a lens that uniformly focuses light transmitted from the light source on the LCD
Implementation Method 3
an optical path control unit, potentially including a Fresnel lens, adjusts the light path
Data Source
AI summary
A picture generation apparatus including: a printed circuit board (PCB) on which one or more light sources are disposed; a Liquid Crystal Display (LCD) configured to emit an image using light transmitted from the one or more light sources; and an optical path control unit disposed between the PCB and the LCD, and configured to control a travel path of light, wherein the LCD is disposed to be offset from an incident optical axis of external light, and wherein the PCB is disposed to be parallel to the LCD.