Floating Image Display Device Stray Light Blocking Layer
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Solution Overview
Problem
Conventional floating image display devices suffer from stray light issues due to ineffective areas in the floating lens, leading to blurring at the periphery of the floating image and degradation of image quality.
Innovation Solution
A floating image display device incorporating a light source module, a periodical optical structure with lenses, and a blocking layer. The blocking layer is strategically placed between adjacent lenses to absorb or block stray light, with specific beam angles defined by the angles α and β, ensuring effective reduction of stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a floating lens is used to refract and bend light for creating a floating image, then the visual experience of floating in mid-air is achieved, but stray light occurs in the ineffective area of the lens causing blurring at the periphery and degradation of image quality
Solution Approach 1:
The patent divides the optical system into multiple discrete lenses arranged in an array, where each lens handles a specific portion of the light. This segmentation allows for better control of light paths and reduces stray light in the ineffective areas between lenses, as each lens independently focuses light to its designated region without interfering with adjacent lenses' effective areas.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the light source and the floating lens array. This light guide plate uniformly distributes light before it reaches the lenses, reducing direct stray light exposure and improving overall image quality by mediating the light distribution across the optical system.
2Manufacturing precision
If multiple lenses are arranged adjacent to one another in a periodical optical structure, then the floating image is formed, but the ineffective area between lenses generates stray light that blurs the periphery
Solution Approach 1:
The patent applies different properties to different parts of the optical system. Specifically, the space between adjacent lenses is treated differently from the effective optical areas by introducing light guide plates with specific optical properties in the inter-lens regions. This local differentiation allows the ineffective areas to be optimized for stray light reduction while maintaining the high-quality imaging performance in the effective lens areas.
Solution Approach 2:
Light guide plates are positioned as intermediary elements between adjacent lenses to manage the light in the ineffective areas. These intermediaries guide and distribute light to prevent it from creating stray light paths that would cause peripheral blurring, thereby protecting the image quality without interfering with the primary imaging function of the lenses.
3Quantity of substance
If light is allowed to pass through all areas including ineffective areas, then more light is available for imaging, but image quality degrades due to stray light and blurring
Solution Approach 1:
The optical system is segmented into effective imaging areas (through the lenses) and ineffective areas (between lenses). By segmenting the light paths and using separate light guide plates for different regions, the system can optimize light quantity in effective areas while controlling stray light in ineffective areas, achieving both high light quantity and clear images.
Solution Approach 2:
Multiple light guide plates are used as intermediaries to manage light distribution across different regions. These intermediaries ensure that sufficient light reaches the effective imaging areas while preventing excessive or uncontrolled light from passing through ineffective areas, thus maintaining both light quantity and image clarity.
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 implementation of the blocking layer reduces stray light intensity by over 80%, while retaining necessary imaging light rays, thereby enhancing the sharpness and display quality of the floating three-dimensional images.
Implementation Method 1
The blocking layer is configured to block or absorb a part of the light
Implementation Method 2
utilizes a floating lens for refracting and bending light, projecting images to precise positions
Data Source
AI summary
A floating image display device includes a light source module, a periodical optical structure and a blocking layer. The light source module generates light. The periodical optical structure includes lenses, and the light passes through the periodical optical structure and forms a floating image. The blocking layer is configured to block or absorb a part of the light, and the blocking layer is between any adjacent two lenses. A beam angle of another part of the light not blocked or absorbed by the blocking layer ranges between angles α and β, and the following conditions are satisfied: α=tan−1 (d/h); and β=2 tan−1 (d/2h), wherein α is an off-axis viewing angle, β is an on-axis viewing angle, d is a maximum width of an aperture corresponding to each lens, and h is a distance from the light source module to the aperture.