Windshield Optical Film Layout for HUD Ghost Image Separation
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Solution Overview
Problem
Existing HUD systems using windshields for imaging suffer from ghosting issues due to multiple specular reflections, requiring additional free-form surface reflectors that occupy space and affect viewing clarity.
Innovation Solution
An optical film with stacked layers of lens and deflection layers is attached to the windshield, amplifying and deflecting light beams to separate virtual images into different directions, eliminating ghosting without additional optical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional free-form surface reflectors are used to correct ghosting, then imaging quality is improved, but device complexity and space occupancy increase
Solution Approach 1:
The patent combines multiple optical functions (reflection, refraction, light guiding) into a single integrated optical film structure with multiple layers. This eliminates the need for separate free-form surface reflectors and other additional optical components, thereby improving imaging quality while reducing device complexity and space occupancy.
Solution Approach 2:
The optical film is designed to perform multiple functions simultaneously: it reflects light beams, refracts light beams, guides light beams, and corrects ghosting effects. This multi-functionality replaces what would traditionally require multiple separate optical components, resolving the contradiction between imaging quality and device complexity.
2Reliability
If multiple optical components are stacked to eliminate ghosting, then virtual image clarity is improved, but space occupancy increases
Solution Approach 1:
The optical film employs a nested multi-layer structure where different functional layers (reflection layer, refraction layer, light guiding layer) are stacked and integrated within a compact form. This nesting approach allows multiple optical functions to be performed within a minimal space, improving virtual image clarity without significantly increasing space occupancy.
Solution Approach 2:
The patent uses thin-film technology to create the optical film, which provides multiple optical functions in a very compact, space-efficient format. The thin-film structure allows for integration of reflection, refraction, and light guiding functions without occupying significant space, thereby improving image clarity while minimizing volume increase.
3Device complexity
If traditional HUD optical paths are used, then system simplicity is maintained, but ghosting effects occur reducing image quality
Solution Approach 1:
The optical film acts as an intermediary component between the light source and the windshield, performing multiple optical functions in one integrated structure. This intermediary approach eliminates ghosting effects and improves image quality while maintaining relative system simplicity, as the optical film replaces rather than adds to the optical path complexity.
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
The optical film simplifies HUD systems by integrating optical functions, eliminating ghosting and reducing space occupancy, while enabling clear virtual image observation without additional components.
Implementation Method 1
The reflection layer is configured to reflect an image light beam to form a first reflected light beam
Implementation Method 2
the first lens layer and the first deflection layer are configured to amplify and/or deflect the first reflected light beam
Implementation Method 3
the second reflected light beam is formed by that the windshield reflects the image light beam
Data Source
AI summary
An optical film and an optical imaging system are provided. The optical film includes a first lens layer, a first deflection layer, a reflection layer, a second deflection layer, and a second lens layer. The second lens layer is attached to a windshield. The reflection layer is configured to reflect an image light beam to form a first reflected light beam and the first lens layer and the first deflection layer are configured to amplify and/or deflect the first reflected light beam, to guide the first reflected light beam to a field-of-view direction. The second lens layer and the second deflection layer are configured to amplify and/or deflect a second reflected light beam, to guide the second reflected light beam to a first direction. The second reflected light beam is formed by that the windshield reflects the image light beam. The field-of-view direction is different from the first direction.