Projection Display Pixel Vibration Reduction via Signal Segmentation
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Solution Overview
Problem
Existing projection video display apparatuses face challenges in maintaining the quality of projection images, particularly in achieving higher resolution and reducing video display disturbances caused by pixel vibrations.
Innovation Solution
A projection video display apparatus that includes a converter to reduce the number of pixels and increase the frame rate of the video signal, a light source modulated by Digital Mirror Devices, an optical element that displaces the optical axis of the video light beam, and a rotating body with controlled rotation speed to optimize image projection, thereby enhancing image quality and reducing pixel vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve resolution, then image quality improves, but video display disturbances caused by pixel vibrations increase
Solution Approach 1:
The patent segments the video signal into multiple sub-frame signals with different resolutions. The high-resolution signal is used for static or slowly changing image portions, while lower-resolution signals are used for dynamic portions, thereby reducing pixel vibrations in high-resolution areas without sacrificing overall image quality.
Solution Approach 2:
The patent dynamically switches between different resolution signals based on the characteristics of the video content. By adapting the resolution to the temporal and spatial characteristics of the image, the system maintains high resolution where needed while reducing vibrations in areas where content changes rapidly.
2Speed
If the frame rate is increased to improve motion clarity, then motion representation improves, but the complexity of the video signal processing increases
Solution Approach 1:
The patent segments a single high-frame-rate signal into multiple lower-resolution sub-frame signals. This segmentation reduces the processing complexity for each individual signal while maintaining the effective frame rate through temporal multiplexing, as the combined effect of multiple sub-frames provides motion clarity equivalent to higher frame rates.
Solution Approach 2:
The patent applies partial action by using different resolution levels for different portions of the video content. Instead of uniformly processing all pixels at full resolution for every frame, the system processes only necessary portions at high resolution, reducing overall processing complexity while maintaining motion clarity where required.
3Measurement precision
If an optical path changing unit is added to shift the optical path, then resolution improves, but the device complexity and potential for vibration increase
Solution Approach 1:
The patent replaces the mechanical optical path changing unit with a signal processing approach. Instead of physically shifting optical paths using moving components, the system achieves equivalent resolution enhancement through digital signal processing and selective projection of sub-frame signals, thereby eliminating mechanical complexity and associated vibrations.
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 apparatus effectively maintains high-quality projection images by improving resolution and minimizing video display disturbances, ensuring a better viewing experience.
Implementation Method 1
an optical element that displaces an optical axis of the video light beam output from the light bulb
Data Source
AI summary
A projection video display apparatus includes: a converter that converts an input video signal having a first number of pixels and a first frame rate into a conversion video signal having a second number of pixels and a second frame rate, the second number of pixels being smaller than the first number of pixels, and the second frame rate being an n-th multiple (n is an integer of 2 or greater) of the first frame rate; an optical element that displaces an optical axis of the video light beam; an optical element driving unit that drives the optical element at a frequency F being a natural-number multiple of the first frame rate; and a rotating body that rotates at a rotation speed R. The rotation speed R is set so as to become a value within a predetermined range corresponding to the frequency F.