Inclined Screen Image Display Device with Optical Distance Correction
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Solution Overview
Problem
Conventional image display devices struggle to display virtual images with a viewing distance that gradually varies in the depth direction, particularly in configurations using two screens, which complicates navigation and directional indications for drivers.
Innovation Solution
An image display device with a screen inclined relative to the optical axis of a converging lens, equipped with an optical distance correction member that adjusts the optical path to ensure uniform focusing across the entire image display region, allowing for a high-definition image with varying viewing distances in the depth direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the screen is inclined relative to the optical axis to achieve gradually varying viewing distances, then the viewing distance variation is improved, but the focusing uniformity deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the screen have different orientations. The screen is inclined relative to the optical axis of the converging lens, creating a gradient in viewing distances across the display region. This allows the left and right portions of the screen to present different virtual image distances, accommodating the human binocular depth perception mechanism where each eye receives images at slightly different distances.
Solution Approach 2:
The patent introduces an optical distance correction member as an intermediary element between the converging lens and the screen. This member compensates for the optical path differences caused by the inclined screen configuration, ensuring that light from different regions of the inclined screen still focuses uniformly on the retina. The correction member acts as a mediator that reconciles the geometric inclination with optical focusing requirements.
2Adaptability or versatility
If two screens are used to create staged viewing distances, then the viewing distance steps are achieved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple screens into a single inclined screen. Instead of using two separate screens positioned at different distances, the invention combines their functionality into one screen that is inclined relative to the optical axis. This single screen creates the effect of multiple viewing distances through its geometric orientation, thereby reducing device complexity while achieving the same adaptability.
Solution Approach 2:
The patent transitions from a one-dimensional arrangement (multiple screens at different positions along the optical axis) to a two-dimensional solution (a single screen inclined at an angle). By introducing the angular dimension, the system achieves varied viewing distances without requiring multiple discrete components, thus simplifying the overall device structure.
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 solution enables the display of high-definition images with gradually varying viewing distances, improving visibility and definition, especially for navigation and directional cues, by ensuring uniform focusing and correcting optical distances to maintain image clarity across the entire display region.
Implementation Method 1
The converging lens is configured to converge the light emitted from the light source onto the screen
Implementation Method 2
The optical distance correction member adjusts an optical distance of light transmitting through the optical distance correction member
Implementation Method 3
The screen is irradiated with light from the light source, and an image is formed on the screen. The optical system forms a virtual image by using the light from the screen
Data Source
AI summary
An image display device includes a light source, a screen, an optical system, a converging lens, an optical distance correction member, and a scanning unit. The converging lens is configured to converge the light emitted from the light source onto the screen. The optical distance correction member is disposed between the converging lens and the screen. The scanning unit scans the screen with the light from the light source. The screen is disposed so as to be inclined with respect to a plane perpendicular to an optical axis of the converging lens so that a viewing distance of the virtual image gradually varies. The optical distance correction member adjusts an optical distance of light transmitting through the optical distance correction member so that a distance between the screen and a focusing position of the light is made substantially identical over an entire image display region in the screen.