Shaped Highlight Beam for Projector Light Efficiency
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Solution Overview
Problem
Existing projector systems waste a significant amount of light, requiring over-engineered light sources and complex thermal management due to the need to generate light for the brightest image elements, leading to inefficiency and increased costs.
Innovation Solution
The system employs a beam splitter to separate light into illumination and highlight beams, with the highlight beam being controllably shaped using a reflector array and micro-electromechanical system (MEMS) to direct light only where needed, reducing overall light usage and improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source generates enough light to support the brightest element of the image, then the peak luminance requirement is met, but the majority of source light (about 90%) is wasted
Solution Approach 1:
The source light beam is segmented into two separate beams using a beam splitter: an illumination beam for general image illumination and a highlight beam for localized high brightness regions. This segmentation allows each beam to be optimized for its specific purpose, with the highlight beam providing intense light only where needed in the image, thereby reducing overall light waste while maintaining peak luminance requirements.
Solution Approach 2:
The highlight beam is shaped to provide localized high intensity illumination only in specific regions of the image where peak luminance is required. The beam shaping apparatus (including reflectors and rod arrays) concentrates light precisely where needed rather than uniformly across the entire image, matching the spatial distribution of brightness requirements and minimizing energy waste in dark regions.
2Illumination intensity
If the light source is over-engineered to supply far more light than necessary, then the peak luminance requirement is met, but cost and complexity increase
Solution Approach 1:
The illumination system is segmented into two independent light paths: one for general illumination and one for highlights. This allows the light source to be appropriately sized for the combined requirements rather than being over-engineered for peak alone, since the highlight path uses a separate beam that is shaped and directed only where needed, reducing the total light output requirement from the source.
Solution Approach 2:
The system dynamically adjusts the distribution of light between the illumination beam and highlight beam based on the image content requirements. The beam splitter and beam shaping apparatus can be controlled to allocate more light to highlights when needed and reduce overall output when peak luminance is not required, making the light source usage adaptive rather than static and excessive.
3Illumination intensity
If enough light is generated for the brightest elements, then peak luminance is achieved, but thermal management systems are required to remove heat
Solution Approach 1:
By segmenting the light into separate illumination and highlight beams, the system avoids generating excessive light that would convert to heat. The highlight beam is precisely shaped and directed only to regions requiring peak luminance, reducing the total light energy that must be processed and thereby reducing heat generation in the optical path and imaging device.
Solution Approach 2:
Instead of providing full illumination at peak intensity across the entire image (excessive action), the system applies intense light only partially to the specific regions where highlight luminance is required. This partial action approach meets peak luminance needs while avoiding the heat generation that would result from uniform high-intensity illumination across the whole image area.
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 allows for high dynamic range images with localized high brightness regions while minimizing total light use, reducing waste and the need for excessive light sources, thus enhancing energy efficiency and image contrast.
Implementation Method 1
The beam splitter can be a polarizing beam splitter and the optical combiner can include another polarizing beam splitter
Implementation Method 2
The highlight apparatus can include a reflector positioned at a controllable angle
Data Source
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AI summary
A source light beam is split into an illumination beam and a highlight beam. The highlight beam can be controllably shaped into a shaped highlight beam based on a brightness analysis of an image to output. The illumination beam and the shaped highlight beam are combined and provided to an imaging device that generates the image using the combined beam. An array of reflectors, such as a MEMS mirror device, can be used in conjunction with a stacked rod array to generate the shaped highlight beam. The illumination beam and the shaped highlight beam can be combined using offset lenses or a polarizing beam splitter.