LCoS Light Compensation via Merged Beam Path and Feedback
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Solution Overview
Problem
Conventional display systems using Liquid Crystal on Silicon (LCoS) technology face issues with uneven illumination and increased optical losses due to complex beam pathways and the need for accurate alignment of multiple lenses and light sources, leading to higher costs and reduced luminosity uniformity.
Innovation Solution
A light compensation scheme that eliminates the need for color separation sets and accurate alignment by using a plurality of different-color pointolites, an optical lens, a polarizing beam splitter, and a liquid crystal panel, with a controller and detectors to adjust luminosity and transmittance in real-time to achieve uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical lenses and color separation sets are used to transmit different-color beams, then the display system can achieve high-resolution large-screen display, but the optical losses increase and the beam pathway design becomes more complicated and costly
Solution Approach 1:
The patent merges the transmission of different-color beams (R, G, B) through a single optical lens instead of using separate lenses for each color. This combining approach reduces the number of optical components, decreases optical losses, and simplifies the beam pathway design while maintaining the ability to deliver high-resolution display performance
2Adaptability or versatility
If multiple optical lenses are used to transmit different-color beams, then the display system can process multiple colors, but the alignment accuracy requirements increase and the manufacturing cost increases
Solution Approach 1:
The patent combines the transmission of multiple color beams through a single optical lens, eliminating the need for precise alignment between multiple lenses. This merging approach maintains full color processing capability (R, G, B beams) while dramatically reducing the alignment accuracy requirements and associated manufacturing costs
3Adaptability or versatility
If different-color light sources are used to emit different-color beams, then the display system can achieve full-color display, but the luminosity uniformity decreases and the illumination evenness becomes uneven
Solution Approach 1:
The patent employs a feedback mechanism where detectors measure the luminosity of each different-color beam (R, G, B) and the controller adjusts the drive signals to the light sources based on these measurements. This closed-loop control compensates for inherent luminosity differences between different-color LEDs, achieving uniform illumination across all colors while maintaining full-color display capability
4Device complexity
If a monochromatic light source with color separation is used, then the beam pathway can be simplified, but the optical losses increase due to multiple transmission interfaces
Solution Approach 1:
The patent combines the transmission of multiple color beams through a single optical lens rather than using separate lenses for each color. This merging approach reduces the number of optical transmission interfaces, thereby decreasing optical losses while maintaining a relatively simple beam pathway design
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 solution reduces the inner space and manufacturing costs of the optical machine device, shortens beam pathways, and enhances uniform illumination by actively calibrating luminosity and transmittance, eliminating the need for complex beam pathways and color separation systems.
Implementation Method 1
the polarizing beam splitter is employed to directly receive the different-color illuminating beams possessed by the optical lens to correspondingly form a plurality of different-color polarized incident beams
Implementation Method 2
a plurality of pixel electrodes arranged in active matrixes of the LCoS panel possess direction change of liquid crystals (LCs) based on a specific voltage applied on modulating the different-color polarized beams
Implementation Method 3
The different-color reflective beams of the image are reflected from the LCoS panel to the screen via the polarizing beam splitter and the projecting lens
Data Source
AI summary
A light compensation scheme, an optical machine device, a display system and a method for light compensation are disclosed herein. The light compensation scheme includes a detector for inspecting a data related to a luminous flux of each of different color beams, and a controller for selectively adjusting anytime a luminosity of at least one of a plurality of pointolites and/or the transmittances of at least one part of liquid crystals disposed within a liquid crystal display panel, based on the inspected data.