Projection System with Selective Light Absorbing Screen Pixels
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Solution Overview
Problem
Ambient light reflection reduces the contrast of images projected onto reflective screens in existing projection systems, leading to a loss of image quality.
Innovation Solution
A projection system comprising a screen with selectively absorbing and reflecting pixels, coordinated with a projector to control light absorption and reflection based on image data, enhancing contrast by separating luminance and chrominance components and adjusting light intensity accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reflective screen is used to display projected images, then the screen can be seen from multiple angles, but ambient light reflection reduces image contrast
Solution Approach 1:
The screen is divided into individual pixels that can independently control light reflection and absorption. Each pixel acts as a separate element that can be dynamically switched between reflective and absorptive states, allowing selective management of ambient light at the pixel level while maintaining the reflective screen's multi-angle viewing capability.
Solution Approach 2:
Different regions of the screen (individual pixels) have different optical properties at different times. Pixels can locally switch between being highly reflective (for viewing angle benefit) and highly absorptive (for contrast improvement), allowing each pixel to have optimized properties for its specific function in the displayed image.
2Ease of manufacture
If screen resolution is reduced to lower costs, then manufacturing becomes simpler, but image quality may deteriorate
Solution Approach 1:
The system merges the functions of luminance display (handled by the projector) and chrominance display (handled by the screen's color filters). This allows the screen to have lower resolution while the projector compensates by projecting high-resolution luminance information, achieving high overall image quality without requiring the screen to manufacture high-resolution pixel structures.
Solution Approach 2:
The projector creates a luminance copy of the image that is projected onto the screen. This luminance information is then combined with the screen's chrominance information, allowing the final displayed image to have high quality even though the screen itself has lower resolution physical structures.
3Device complexity
If the projector design is simplified to reduce costs, then device complexity decreases, but control over image quality parameters becomes more limited
Solution Approach 1:
The chrominance processing function is extracted from the projector and transferred to the screen's pixel structure. This allows the projector to be simplified to handle only luminance information, reducing its complexity and cost, while the screen handles color information through its pixel design with transparent and colored regions.
Solution Approach 2:
The screen pixels serve multiple functions: they act as color filters for chrominance display, as shutters for controlling ambient light reflection, and as a substrate for receiving projected luminance information. This multi-functionality allows the simplified projector to achieve complex image quality control through coordination with the versatile screen.
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 significantly enhances image contrast and color saturation while allowing for lower screen resolution and simpler projector design, reducing costs and maintaining image quality.
Implementation Method 1
screen 12 includes a multitude of finite light-absorbing and reflecting portions referred to as screen pixels 20
Implementation Method 2
different colored light is reflected from different portions of screen 12
Data Source
AI summary
A color image is displayed on a screen and a luminance image is projected onto the screen. The luminance image has a greater resolution than the color image.