HUD Optical Sheet Uniformity via Diffuser and Prism
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Solution Overview
Problem
Conventional head-up display devices suffer from non-uniform light distribution, leading to reduced optical uniformity and image quality for drivers, which affects the clarity and effectiveness of displayed driving information.
Innovation Solution
The implementation of a head-up display device with multiple optical members between the light source and image panel, including a first optical member with curved surfaces and an optical sheet, such as a diffuser or prism sheet, to adjust and concentrate light, ensuring uniform illumination and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light emitting unit uses light emitting diodes to display driving information, then energy efficiency and longevity are improved, but optical uniformity and image quality deteriorate due to non-uniform light distribution
Solution Approach 1:
A diffuser sheet is introduced as an intermediary component between the LED light emitting unit and the image panel. This diffuser sheet scatters and redistributes the non-uniform light from the LEDs, creating uniform illumination across the image panel while maintaining the energy-efficient LED light source
Solution Approach 2:
The optical properties of the light distribution are changed by introducing optical members with specific diffusion and refraction characteristics. The diffuser sheet and prism sheet modify the light parameters (direction, intensity distribution) to achieve uniform illumination while preserving LED energy efficiency
2Illumination intensity
If multiple optical members are added between light source and image panel to improve optical uniformity, then image quality is improved, but device complexity increases
Solution Approach 1:
Multiple optical functions (diffusion, refraction, light path control) are merged into a single integrated optical member assembly. The diffuser sheet and prism sheet are positioned and configured to work together as a unified optical system, achieving complex light distribution goals without proportionally increasing structural complexity
Solution Approach 2:
The optical members serve multiple functions simultaneously: the diffuser sheet provides both uniform light distribution and protects the LED array, while the prism sheet contributes to both illumination uniformity and light path optimization. This multi-functionality reduces the need for additional separate components
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 enhances optical uniformity and image quality by reducing light deviations and separation spaces, providing a clearer and more consistent virtual image for drivers, thereby improving the overall display performance.
Implementation Method 1
a first optical member for changing the path of light emitted from the at least one light source
Implementation Method 2
an optical sheet for transferring light emitted from the first optical member to a second optical member, and the second optical member for changing the path of light transferred from the optical sheet
Implementation Method 3
The optical sheet may be a diffuser sheet or a prism sheet
Implementation Method 4
the second optical member for changing the path of light transferred from the optical sheet
Implementation Method 5
The head up display device may further include a reflective member for changing the path of light emitted from the second optical member
Data Source
AI summary
The embodiments provide a head up display device comprising: at least one light source for emitting light; a first optical member for changing the path of light emitted from the light source; an optical sheet for transferring light emitted from the first optical member to a second optical member described below; and the second optical member for changing the path of light transferred from the optical sheet, and including a first surface in the direction of the optical sheet and a second surface in the direction of an image panel described below, wherein the first surface and the second surface are both curved surfaces.