HUD Collimator Focus Zones for Alignment-Tolerant Luminance
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Solution Overview
Problem
The alignment accuracy between the light source and collimator in existing head-up display systems is difficult to maintain, leading to deviations in display image luminance and unevenness, which results in low manufacturing yield.
Innovation Solution
The collimator includes a reflection portion with normal, short, and long focus areas, each with distinct curvatures, allowing for smoother transitions and improved alignment tolerance, even when positional deviations occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high alignment accuracy is required between light source and collimator, then display image luminance and luminance unevenness meet design values, but manufacturing yield deteriorates
Solution Approach 1:
The collimator's reflection portion is divided into multiple focus areas (normal focus area, long focus area, short focus area) with different curvature radii. Each area has optimized local optical properties to handle different alignment conditions, allowing the system to maintain performance across a broader range of alignment tolerances and improving manufacturing yield.
Solution Approach 2:
The reflection portion employs multiple curvature radii (R1, R2, R3) in different focus areas to adjust optical parameters. This parameter variation allows the collimator to compensate for alignment deviations between the light source and collimator, maintaining display image luminance and uniformity within acceptable ranges even when alignment accuracy varies, thus improving manufacturing yield.
2Productivity
If the relative positions of light source and collimator deviate, then manufacturing yield improves, but display image luminance and luminance unevenness deteriorate
Solution Approach 1:
Different focus areas (normal, long, short) with distinct curvature radii are designed to handle different positional deviation scenarios. The normal focus area handles ideal alignment, while long and short focus areas compensate for deviations in opposite directions, maintaining luminance performance across varied manufacturing tolerances.
Solution Approach 2:
The collimator is pre-designed with multiple focus areas that anticipate and compensate for potential alignment deviations before they occur during manufacturing. This proactive design cushions against positional variations, ensuring display image luminance remains within acceptable ranges even when alignment is not perfect, thereby improving manufacturing yield.
3Productivity
If the relative positions of light source and collimator deviate, then manufacturing yield improves, but display image luminance unevenness deteriorates
Solution Approach 1:
The reflection portion is segmented into multiple focus areas with different curvature radii optimized for different alignment conditions. This local differentiation allows the system to maintain luminance uniformity across the display image even when the light source and collimator experience positional deviations during manufacturing.
Solution Approach 2:
By varying the curvature radius parameters (R1, R2, R3) across different focus areas, the optical system can compensate for alignment deviations. This parameter diversity ensures that luminance unevenness remains within acceptable ranges despite variations in manufacturing alignment, improving manufacturing yield.
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 suppresses fluctuations in display image luminance and unevenness, enhancing manufacturing yield by maintaining optimal optical performance and light utilization efficiency.
Implementation Method 1
a collimator which is arranged to face the light source and includes a reflection portion for adjusting a focal length of light incident from the light source to the collimator
Data Source
AI summary
A light source apparatus and the like capable of improving the manufacturing yield are provided. The light source apparatus includes a light source, a collimator which is arranged to face the light source and includes a reflection portion for adjusting a focal length of light incident from the light source to the collimator, and a light guide arranged on an emission side of the collimator. The reflection portion of the collimator includes a normal focus area in which the light emitted from the light source and incident to the collimator is converted into substantially parallel light, a long focus area in which the light incident to the collimator is converted into slightly divergent light in comparison with the substantially parallel light, and a short focus area in which the light incident to the collimator is converted into slightly convergent light in comparison with the substantially parallel light.