HUD Light Source Collimator With Multi-Focus Alignment Tolerance
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Solution Overview
Problem
The existing light source apparatus for head-up displays experiences manufacturing yield issues due to alignment accuracy requirements between the light source and collimator, leading to deviations in display image luminance and unevenness.
Innovation Solution
The light source apparatus incorporates a collimator with a reflection portion featuring normal, short, and long focus areas, which adjusts the focal length of light to maintain optimal luminance and reduce luminance unevenness even when the collimator's position deviates relative to the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high accuracy alignment between the light source and collimator is required to maintain display image luminance and luminance unevenness within design values, then the display quality is improved, but the manufacturing yield deteriorates due to difficulty in achieving precise alignment
Solution Approach 1:
The invention changes the optical parameter (focal length) of the collimator by providing multiple focus areas with different focal lengths. This allows the system to accommodate positional deviations between the light source and collimator by selecting an appropriate focal length, thereby maintaining display quality without requiring high precision alignment and improving manufacturing yield.
2Ease of manufacture
If the relative positions of the light source and collimator deviate from predetermined positions, then the manufacturing process becomes easier with lower alignment requirements, but the display image luminance and luminance unevenness deviate from design values
Solution Approach 1:
The collimator is designed with multiple focus areas having different focal lengths. When the light source and collimator positions deviate, the system can switch to a focus area with a different focal length that compensates for the positional deviation, thereby maintaining display image luminance and luminance unevenness within design values even with lower alignment tolerance.
3Device complexity
If a single focal length is used in the collimator, then the device complexity is reduced, but the ability to maintain consistent display performance under positional deviations deteriorates
Solution Approach 1:
The collimator is divided into multiple focus areas, each with a different focal length. This local differentiation allows each area to handle specific positional deviation scenarios, improving display performance consistency without requiring complex external adjustment mechanisms, thus achieving a balance between device complexity and reliability.
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 manufacturing yield by suppressing fluctuations in display image luminance and luminance unevenness, ensuring consistent performance and alignment accuracy.
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.