HUD Field Lens Composite Surface and Condenser Diffusion
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Solution Overview
Problem
Existing head-up display (HUD) apparatuses suffer from color unevenness and insufficient luminance due to the arrangement of optical components, which affects the visibility of virtual images displayed to occupants.
Innovation Solution
The HUD apparatus employs a composite surface on the field lens made of connecting optical surfaces and a condenser lens with a diffusion part to mix and diffuse optical source lights of different colors, ensuring high luminance and suppressing color unevenness by collecting and projecting optical source lights with large optical amounts per unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a diffusion plate is arranged between the condenser lens and the field lens to diffuse optical source light, then color unevenness is suppressed, but the optical amount per unit area decreases leading to insufficient luminance
Solution Approach 1:
The invention extracts the diffusion function from a separate diffusion plate and integrates it into the condenser lens by providing a diffusion part on the optical source light incident surface. This eliminates the need for a separate diffusion plate while maintaining both color uniformity and luminance.
Solution Approach 2:
The invention merges the diffusion function with the condenser lens function by integrating a diffusion part into the condenser lens structure. This combination allows the condenser lens to both concentrate light and diffuse it, resolving the contradiction between luminance and color uniformity.
2Device complexity
If optical source lights of different colors are not mixed, then the optical path is simple, but color unevenness occurs in the displayed virtual image
Solution Approach 1:
The invention introduces a reflection part as an intermediary element that redirects optical source lights to pass through the composite surface of the field lens. This mediator enables color mixing through the composite surface while keeping the overall optical path relatively simple.
3Device complexity
If the field lens uses a single surface to collect and project light, then the structure is simple, but color unevenness cannot be suppressed
Solution Approach 1:
The invention segments the field lens surface into a composite surface made of multiple optical surfaces (first optical surface and second optical surface). This segmentation allows different portions of the composite surface to handle different aspects of light collection and color mixing, achieving color uniformity while maintaining reasonable structural complexity.
Solution Approach 2:
The invention applies the composite surface concept to the field lens, creating a structure with multiple optical surfaces that work together. This composite structure enables both effective light collection and color mixing, resolving the contradiction between structural simplicity and color uniformity.
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 achieves excellent visibility for virtual image display by concurrently addressing color unevenness and luminance issues, providing a clear and bright virtual image projection.
Implementation Method 1
a condenser lens that faces the optical source part and collects the optical source light; the condenser lens has a diffusion part that diffuses the optical source light
Implementation Method 2
a field lens that further collects the optical source light from a side of the condenser lens and projects the optical source light at a predetermined angle
Implementation Method 3
an image formation element that forms an image by incidence of the optical source light from a side of the field lens, and emits light of the image to a side of the projection member
Implementation Method 4
projects an image to a projection member to display a virtual image of the image so that an occupant enables to visually confirm the image
Data Source
AI summary
A HUD apparatus is provided. The HUD apparatus is provided with: an optical source part having a light emission element; a condenser lens, which faces the optical source part, and collects light source light; a field lens, which further collects the light source light transmitted from the condenser lens side, and which projects light at a predetermined angle; and an image formation element, which forms an image when the light source light transmitted from the field lens side is inputted thereto, and which projects light of an image toward the windshield side. The field lens has a composite surface on at least one of the condenser lens side and the image formation element side, the composite surface having multiple continuous optical surfaces. The condenser lens has a diffusion part that diffuses the light source light.