Wire Grid Polarizing Plate Axis Identification for HUD Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current head-up display devices face challenges in accurately adjusting the polarization reflection axis direction of reflection type polarizing plates, which affects the uniformity of brightness in projected images, due to difficulties in visually identifying the polarization axis direction.
Innovation Solution
Incorporating a wire grid polarizing plate with a fine metal wire region and a concavo-convex structure on the substrate, where the fine metal wires have varying widths or heights, and are unevenly distributed, allowing for visual indication of the polarization axis direction through diffracted light, enabling easy adjustment and recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a reflection type polarizing plate is used to reduce sunlight effect, then heat generation is reduced, but the polarization reflection axis direction becomes difficult to visually identify
Solution Approach 1:
A transparent adhesive layer with specific refractive index (different from both the polarizing plate and substrate) is introduced as an intermediary between the reflection type polarizing plate and the substrate. This adhesive layer creates optical path differences that generate visible interference fringes, serving as a mediator that makes the polarization axis direction detectable through visual observation of the interference pattern without affecting the heat reduction function of the polarizing plate
Solution Approach 2:
The invention utilizes optical interference effects to produce visible color patterns (interference fringes) in the transparent adhesive layer. These color changes and interference patterns are directly related to the polarization axis direction, allowing visual identification of the axis orientation through the color and pattern characteristics of the interference fringes
2Illumination intensity
If the polarization reflection axis direction is not accurately adjusted, then brightness uniformity deteriorates, but adding visual indicators increases device complexity
Solution Approach 1:
The transparent adhesive layer serves multiple functions simultaneously: it bonds the polarizing plate to the substrate, and it generates visible interference fringes that indicate the polarization axis direction. This multi-functionality eliminates the need for separate indicator structures, achieving axis visualization without increasing device complexity
Solution Approach 2:
The system uses its own optical components (the transparent adhesive layer with specific refractive index) to automatically generate visual indicators of the polarization axis direction. The interference fringes self-form based on the optical properties of the adhesive layer and the polarization characteristics of the incident light, providing self-indication without requiring external marking or additional measurement devices
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 solution allows for precise adjustment of the polarization reflection axis direction, enhancing the uniformity of brightness in projected images and simplifying the recognition of the polarization axis direction, thereby improving the performance of head-up display devices.
Implementation Method 1
a reflection type polarizing plate having a reflecting surface that reflects the image light
Implementation Method 2
a reflection type polarizing plate having a reflecting surface that reflects the image light
Implementation Method 3
allowing for visual indication of the polarization axis direction through diffracted light
Data Source
AI summary
To provide an image display device for enabling a polarization axis direction of a reflection type polarizing plate to be identified with simplicity and accuracy, and enabling an adjustment in the polarization reflection axis direction to be made with high accuracy, a wire grid polarizing plate for enabling the polarization axis direction to be examined simply, and the like, a head-up display device (1) in the present invention is an image display device provided with an image display (14) that outputs image light which is polarized light, a reflection type polarizing plate (15) having an reflecting surface (28) that reflects the image light, and a projection plate (11) onto which the image light reflected by the reflection type polarizing plate is projected, and is characterized in that the reflection type polarizing plate allows a bright line (B) as an indicator indicative of the polarization axis direction of the reflecting surface to be observed.