Dual Lens Array Integral Imaging for High-Resolution Air Projection
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Solution Overview
Problem
Existing display systems for integral imaging require displaying multiple elemental images, which limits the resolution and luminance of the reproduced image, and do not allow for flexible positioning of the reproduced image relative to the original image.
Innovation Solution
A display apparatus comprising a display device, a first lens array, and a second lens array, where the first lens array generates elemental images from the original image, and the second lens array integrates these images to form a high-resolution reproduced image at a position different from the original image, using microlenses or pinholes arranged in arrays with adjustable pitches to control the image position and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple elemental images are displayed on the screen, then the reproduced image can be formed in the air, but the resolution and luminance of the reproduced image are limited
Solution Approach 1:
The patent extracts the elemental image generation function from the display screen itself and relocates it to a separate first lens array positioned at a distance from the display device. This allows the display screen to show only a single original image at full resolution, while the first lens array captures and redistributes the light to form multiple elemental images in mid-air, thereby resolving the contradiction between resolution and display complexity
Solution Approach 2:
The first lens array acts as an intermediary between the display device and the second lens array. It receives light from the original image displayed on the screen and transforms it into multiple elemental images at different positions in mid-air. This intermediary component enables the separation of functions: the display shows the original image clearly, while the first lens array creates the elemental images needed for the reproduced image without requiring the display itself to show multiple images
2Illumination intensity
If multiple elemental images are displayed on the screen, then the reproduced image can be formed, but the luminance of the reproduced image is reduced
Solution Approach 1:
The patent extracts the image formation function from the display screen and implements it through optical components in mid-air. By using the first lens array to create elemental images from light captured during the display period, the system concentrates light energy that would otherwise be distributed across multiple display elements into focused elemental images, thereby improving the luminance of the reproduced image
Solution Approach 2:
The first lens array performs preliminary action by capturing and redistributing light from the original image to form elemental images before the light reaches the second lens array. This preliminary image formation in mid-air allows the second lens array to receive pre-organized light patterns, improving the efficiency of the final image integration and enhancing the overall luminance of the reproduced image
3Adaptability or versatility
If the display shows only an original image, then the resolution is maintained, but the reproduced image cannot be positioned flexibly
Solution Approach 1:
The patent introduces dynamic positioning capability by allowing the first lens array to be positioned at variable distances from the display device. By adjusting this distance, the system can change the position where elemental images are formed in mid-air, thereby enabling flexible positioning of the reproduced image. The first lens array may be movable along the optical axis to adapt to different display scenarios and user needs
Solution Approach 2:
The patent adds a spatial dimension to the image formation process by creating elemental images in mid-air at positions between the display device and the second lens array. This three-dimensional arrangement allows the reproduced image to be positioned at different locations in space, providing flexibility in image placement without compromising the resolution maintained by the single original image display
4Illumination intensity
If a single original image is displayed, then the resolution is maintained, but the reproduced image luminance is insufficient
Solution Approach 1:
The patent segments the light from the original image into multiple directional components by using the first lens array to create multiple elemental images. Each elemental image represents a portion of the original image with light directed toward a specific region. This segmentation allows the light energy to be distributed and then reconverged through the second lens array, improving the luminance of the reproduced image while maintaining resolution through the one-to-one correspondence between elemental images and microlenses
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 enables the generation of high-resolution reproduced images with adjustable positioning, enhancing user experience by improving image clarity and luminance without displaying multiple elemental images, and allowing for customization based on user vision and display setup.
Implementation Method 1
a first array of a lens array or a pinhole array disposed distant from the display device and the second array between the display device and the second array. The first array is configured to form a plurality of elemental images generated from the original image at positions between the first array and the second array
Implementation Method 2
The second array is configured to integrate the plurality of elemental images to generate a single reproduced image of the original image
Implementation Method 3
An image reproduction technique based on the principle of integral photography called integral imaging has been known. The integral imaging generates a reproduced image (image to be seen) from a plurality of elemental images
Data Source
AI summary
A display apparatus includes a display device configured to display an original image at an original image display position, a second array of a lens array or a pinhole array, and a first array of a lens array or a pinhole array disposed distant from the display device and the second array between the display device and the second array. The first array is configured to form a plurality of elemental images generated from the original image at positions between the first array and the second array. The pitch of the plurality of elemental images is different from lens pitch or pinhole pitch of the second array. The second array is configured to integrate the plurality of elemental images to generate a single reproduced image of the original image.