Head-Up Display Multi-Panel Polarization for Virtual Image Depth
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Solution Overview
Problem
Conventional head-up displays (HUDs) lack flexibility in arranging virtual images at different distances from the viewer's viewpoint, as the display regions of multiple panels are not superimposed effectively, limiting the freedom in image positioning.
Innovation Solution
A head-up display system with a display device and a magnification optical system that includes a first and second image display panel with polarizers oriented at orthogonal angles, allowing superposition of images on a light transmitting member to create virtual images at varying distances, and a prism sheet to maintain light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple display panels are placed vertically with gaps between them to display images at different distances, then the distances from the viewpoint to the virtual images can be varied, but the display regions cannot be superimposed effectively, limiting flexibility in image arrangement
Solution Approach 1:
The display system is divided into multiple display panels (first and second display panels) positioned at different distances from the reflection member. Each panel independently displays images at different virtual distances, allowing flexible arrangement of information elements in the virtual space while maintaining separate physical structures.
Solution Approach 2:
The patent transitions from a single-plane display to a multi-plane three-dimensional display structure. By arranging display panels at different distances from the reflection member, the system creates depth perception and allows images to be positioned at different virtual distances, adding a spatial dimension to the display arrangement.
2Ease of operation
If display panels are arranged without superimposed display regions, then each panel can be independently positioned, but images at different distances cannot be freely arranged at the viewpoint
Solution Approach 1:
The display system is divided into multiple display panels (first and second display panels) positioned at different distances from the reflection member. Each panel independently displays images at different virtual distances, allowing flexible arrangement of information elements in the virtual space while maintaining separate physical structures.
Solution Approach 2:
The patent transitions from a single-plane display to a multi-plane three-dimensional display structure. By arranging display panels at different distances from the reflection member, the system creates depth perception and allows images to be positioned at different virtual distances, adding a spatial dimension to the display arrangement.
3Ease of manufacture
If light passes through multiple polarizers between display panels, then polarization control can be achieved, but light intensity is reduced
Solution Approach 1:
The first polarizer is selectively placed only on the first display panel, while the second display panel operates without a polarizer. This local differentiation allows polarization control where needed while preserving light intensity in the second panel, optimizing the overall optical performance of the multi-panel display system.
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
Enables flexible arrangement of virtual images at different distances, enhancing viewer comfort by minimizing visual misalignment and maintaining image clarity and intensity.
Implementation Method 1
The first polarizer transmits light polarized in a first direction and blocks light polarized in a direction different from the first direction
Implementation Method 2
The second polarizer transmits light polarized in a second direction different from the first direction and blocks light polarized in a direction different from the second direction
Implementation Method 3
an image reflected by a light transmitting member that transmits and reflects incident light
Data Source
AI summary
According to an aspect, a head-up display causes an image reflected by a light transmitting member to be superimposed on a real image transmitted by the light transmitting member and causes the superimposed image to be visually recognized as a virtual image by an viewer. The head-up display includes a display device and a magnification optical system. The display device includes a backlight, a first image display panel that receives direct light from the backlight, and a second image display panel that is disposed with a gap between the second image display panel and the first image display panel and receives light transmitted by the first image display panel. The first image display panel includes a first polarizer provided between the first image display panel and the backlight. The second image display panel includes a second polarizer provided between the second image display panel and the magnification optical system.