Projection System Temporal Color Synthesis
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Solution Overview
Problem
Conventional projection devices have limitations in dynamic range and color synthesis, resulting in low output luminance and increased manufacturing costs due to the need for multiple sub-pixels and complex drive electronics.
Innovation Solution
A high dynamic range projection system is implemented using subsets of light patterns during temporal fields with two illuminants, allowing for color synthesis through temporal and spatial filtering, reducing the number of sub-pixels required and enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three individually addressable sub-pixels (red, green, blue) are used to form full color pixels, then color output images can be produced in the RGB color space, but manufacturing costs increase due to additional components and drive electronics
Solution Approach 1:
The patent extracts the blue sub-pixel from the traditional RGB trio, using only red and green sub-pixels. The blue color is synthesized temporally by displaying red and green sub-pixels in sequence rather than using a dedicated blue sub-pixel. This reduces the number of sub-pixels and associated drive electronics, directly addressing the manufacturing complexity issue while maintaining color output capability.
Solution Approach 2:
The patent employs temporal color synthesis by periodically displaying different combinations of red and green sub-pixels at different time intervals. By manipulating the timing and duration of red and green sub-pixel activation, the human visual system perceives synthesized colors including blue, cyan, yellow, and white. This periodic temporal modulation replaces the need for static blue sub-pixels, reducing device complexity while preserving color versatility.
2Adaptability or versatility
If three sub-pixels are used for each pixel, then full color images can be displayed, but the number of components and drive electronics increases, leading to higher manufacturing costs
Solution Approach 1:
The patent removes the blue sub-pixel component from the traditional RGB pixel structure, retaining only red and green sub-pixels. The blue color channel is generated through temporal synthesis rather than physical hardware. This extraction of unnecessary components directly reduces manufacturing costs while maintaining the ability to display full color images through temporal color synthesis.
Solution Approach 2:
Instead of using physical blue sub-pixels, the patent creates a temporal copy or representation of blue color by rapidly alternating red and green sub-pixel activation patterns. The human visual system integrates these temporal patterns to perceive blue color, effectively copying the visual effect of blue sub-pixels without the associated manufacturing complexity and cost.
3Adaptability or versatility
If conventional projection devices use three temporal fields with a single modulator, then color images can be synthesized, but the dynamic range of output luminance remains relatively low compared to analog film
Solution Approach 1:
The patent uses periodic temporal fields to display different combinations of red and green sub-pixels, synthesizing multiple colors including blue through temporal modulation. This periodic action enables color synthesis capability while allowing for enhanced luminance control through precise timing and intensity modulation of each sub-pixel activation cycle.
Solution Approach 2:
The patent changes the temporal parameters of sub-pixel activation, including duty cycle, pulse width, and timing intervals, to optimize both color synthesis and luminance output. By dynamically adjusting these temporal parameters, the system achieves high dynamic range luminance while maintaining accurate color synthesis, overcoming the limitations of conventional three-temporal-field approaches.
4Difficulty of detecting and measuring
If red and green sub-pixels are kept in 'off' state during blue image display, then color accuracy is maintained, but luminance contribution from these sub-pixels is lost, reducing overall brightness
Solution Approach 1:
Instead of keeping red and green sub-pixels permanently off during blue display, the patent uses periodic temporal activation where these sub-pixels are briefly turned on and off in specific patterns. This periodic modulation allows the sub-pixels to contribute luminance during their active periods while still enabling blue color perception through temporal synthesis, thus improving overall brightness without sacrificing color accuracy.
Solution Approach 2:
The patent ensures continuous useful action by keeping red and green sub-pixels in a state of controlled temporal activation rather than complete idle state. Even when displaying blue-dominant images, these sub-pixels periodically contribute luminance through brief activation cycles, maintaining continuous light output and improving overall brightness while preserving color accuracy through precise temporal control.
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 system achieves a high dynamic range with improved contrast ratio and reduced manufacturing costs by using fewer sub-pixels and simplifying the drive electronics, while minimizing artifacts and flicker.
Implementation Method 1
light from a light source onto an image modulator, which in turn, adjusts the intensity of incident light for each pixel
Implementation Method 2
Each color element can be configured to modify (e.g., by filtering) the color of the light patterns to produce the projectable image
Data Source
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AI summary
Embodiments relate generally to computer-based image processing, and more particularly, to systems, computer-readable media, methods, integrated circuits, and apparatuses to facilitate operation of a projection system with relatively high dynamic range output by, among other things, providing subsets of light patterns along an optical path during respective first and second temporal fields associated with respective first and second illuminants. The projection system can synthesize color for projectable images by combining or otherwise using the subsets of light patterns with an array of color elements to produce projectable images with color in at least the visible spectrum.