Projection Display System Sub-Image Segmentation
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Solution Overview
Problem
Current projection display systems face challenges in maintaining high resolution when projecting images with resolutions greater than the system's preset resolution, often resulting in loss of pixel information due to the inability to display all pixels of high-resolution images.
Innovation Solution
The system divides high-resolution images into sub-images and uses a control assembly to generate light source, digital micromirror, and optical path changing signals to project each sub-image sequentially, allowing the digital micromirror device to reflect primary colors towards an optical path changing device, which directs the light to a projection lens, effectively overcoming the limitations of lower resolution systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the projection display system uses a fixed number of micromirrors corresponding to preset resolution, then the device structure is simple and cost-effective, but it cannot display high-resolution images without loss of pixel information
Solution Approach 1:
The patent divides a high-resolution image into multiple sub-images, each sub-image being processed and projected separately. This segmentation allows the projection system to display images with resolution higher than the native micromirror array resolution by composing multiple lower-resolution sub-images into a final high-resolution output, thereby preventing pixel information loss without requiring a physically larger micromirror array.
2Loss of information
If the system divides high-resolution images into multiple sub-images for sequential projection, then pixel information is retained without loss, but the projection time increases due to sequential processing
Solution Approach 1:
The patent employs periodic action by sequentially projecting multiple sub-images in rapid succession. Each sub-image is projected in a time slot, and through synchronized optical path switching, the human eye perceives them as a single high-resolution image due to persistence of vision. This periodic projection method retains all pixel information while minimizing perceived projection time.
Solution Approach 2:
The patent introduces an optical path changing device as an intermediary component that switches between different optical paths corresponding to different sub-images. This mediator enables rapid sequential projection of multiple sub-images without requiring physical reconfiguration of the projection system, thereby retaining pixel information while reducing the time penalty associated with sequential processing.
3Loss of information
If the projection display system projects high-resolution images sequentially in time slots, then all pixel information can be displayed, but the projection speed decreases
Solution Approach 1:
The patent implements dynamics by making the optical path changing device switchable and reconfigurable in real-time. The system dynamically assigns different sub-images to different time slots and switches optical paths accordingly, enabling flexible and rapid sequential projection. This dynamic approach allows complete pixel information to be displayed while maintaining high projection speed through efficient time-multiplexed operation.
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 approach enables the projection display system to maintain high-resolution image quality by ensuring all pixel information is retained and displayed without loss, improving the flexibility and effectiveness of image projection.
Implementation Method 1
the digital micromirror device is configured to reflect at least a portion of the light of the plurality of primary colors toward the optical path changing device according to the digital micromirror signal
Implementation Method 2
the optical path changing device is configured to rotate under control of the optical path changing signal, so that light reflected by the digital micromirror device to the optical path changing device is directed to the projection lens
Implementation Method 3
The projection lens is configured to project the N sub-images at different times
Data Source
AI summary
A projection display system includes a control assembly, an optical path changing device, a light source assembly, a digital micromirror device, and a projection lens. The control assembly is configured to determine whether a resolution of an image to be projected is greater than a preset resolution. If the resolution of the image to be projected is greater than the preset resolution, the control assembly divides the image to be projected into N sub-images, wherein N is greater than or equal to 2. For each sub-image: the control assembly is further configured to determine a first signal, a second signal, and a third signal according to the sub-image, send the first signal to the light source assembly, send the second signal to the digital micromirror device, and send the third signal to the optical path changing device. The projection lens is configured to project the N sub-images at different times.