Reflective Light Valve Scanning for High Perceived Resolution
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Solution Overview
Problem
Projection systems employing reflective light valves face limitations in increasing image resolution due to the cost and complexity associated with manufacturing a large number of addressable pixels, making it challenging to achieve higher perceived resolutions with existing technologies.
Innovation Solution
The method involves scanning an image area with modulated light beams from an array of addressable pixels at a speed that allows the viewer's eyes to meld multiple image pixels, effectively perceiving a higher resolution than the actual number of addressable pixels, using a reflective light valve with curved deflectable surfaces and micromirror devices that operate through pulse width modulation, where the intensity peaks of subsequent pixel patterns are offset to create a higher perceived resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of addressable pixels in a reflective light valve is increased to achieve higher image resolution, then the manufacturing cost and device complexity increase significantly
Solution Approach 1:
The patent applies dynamic scanning of the light valve pixels across the projection target at high speed. By rapidly moving the pixel array through the field of view, the system creates the illusion of higher resolution through temporal multiplexing. The viewer's eye integrates multiple sequential pixel positions into a single perceived high-resolution image, effectively decoupling the static pixel count from the perceived resolution.
Solution Approach 2:
The invention transitions from a static spatial arrangement of pixels to a dynamic temporal sequence. Instead of relying solely on the spatial density of pixels, the system adds the time dimension by scanning pixels at high speed. This temporal dimension allows the system to achieve higher perceived resolution without increasing the physical number of pixels, as the eye integrates information across time rather than just space.
2Measurement precision
If the number of addressable pixels is increased to achieve higher image resolution, then the manufacturing cost increases
Solution Approach 1:
By implementing dynamic scanning of the pixel array at high speed, the system achieves higher perceived resolution without requiring a proportional increase in the number of physical pixels. This dynamic approach reduces manufacturing cost while maintaining or improving image quality, as the same physical pixel array can produce higher resolution images through temporal multiplexing.
Solution Approach 2:
The system creates multiple virtual copies of the pixel array positions through rapid scanning. Each pixel position is effectively replicated multiple times across different time frames, creating the illusion of a denser pixel array. This virtual copying allows the system to achieve high resolution without manufacturing additional physical pixels.
3Measurement precision
If the scanning speed of light beams is increased to enable higher perceived resolution, then the temporal resolution requirements become more stringent
Solution Approach 1:
The system changes the temporal parameters by scanning at speeds significantly greater than the human eye can perceive. By operating at these high speeds, the eye cannot resolve individual pixel positions in time, and instead integrates them into a continuous high-resolution image. This parameter change in scanning speed is critical to achieving the desired perceived resolution.
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 of images with higher perceived resolutions than the number of addressable pixels, enhancing image clarity and contrast ratio while reducing the physical size of the image pixels, thus overcoming the limitations of traditional reflective light valve systems.
Implementation Method 1
each addressable pixel has a curved reflective deflectable surface. The curved reflective surface converges the light beams incident thereto at a plane above the curved surface
Implementation Method 2
the micromirror devices are preferably binary micromirrors operated by pulse width modulation
Data Source
AI summary
Disclosed herein is a method of projecting images using reflective light valves. Pixel patterns generated of the light valve pixels based on image data are projected at different locations at a time such that the perceived resolution of the projected images can be higher than the total number of pixels in the light valve.