Multi-Primary Color Display Using Selective Polarization Rotation
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Solution Overview
Problem
Conventional color display devices using three primary colors (RGB) are limited in their ability to produce a wide color gamut and brightness, as they struggle to accurately represent a range of colors, particularly in projection systems where the polarization of light beams can affect image quality.
Innovation Solution
The use of four or more transmissive spatial light modulators, along with a beam combiner and selective color rotators, to modulate and combine light beams corresponding to additional primary colors like yellow, enhancing the color gamut and image brightness by rotating polarization as needed and using dichroic mirrors to separate and direct light beams effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three primary colors (RGB) are used in conventional display devices, then the device complexity is kept simple, but the color gamut and brightness are limited
Solution Approach 1:
The invention divides the color display function into multiple independent spatial light modulators, each handling a specific primary color (red, green, blue, yellow). This segmentation allows each modulator to be optimized for its specific color wavelength, thereby expanding the overall color gamut while maintaining manageable complexity through modular architecture
Solution Approach 2:
The invention adds a new dimension to the traditional RGB color model by introducing a fourth primary color (yellow). This dimensional expansion from three to four color channels enables broader color gamut coverage and improved brightness, as the yellow channel contributes additional luminance information that enhances overall image quality
2Reliability
If polarization rotating plates are inserted to rotate green beam polarization, then the green beam polarization is correctly oriented for the X-cube, but the device complexity increases
Solution Approach 1:
The invention applies polarization rotation locally and selectively only to the green light beam where it is needed, rather than rotating all beams. The polarization rotating plate is positioned specifically in the green beam path to rotate its polarization from s-polarization to p-polarization, while leaving other color beams unaffected. This localized approach achieves the necessary polarization alignment for the X-cube combiner without unnecessarily increasing device complexity
Solution Approach 2:
The polarization rotating plate acts as an intermediary element that mediates between the s-polarized green beam from the spatial light modulator and the p-polarization requirement of the X-cube combiner. By introducing this intermediate polarization conversion step, the system achieves proper beam combination while maintaining overall system reliability
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 significantly widens the color gamut and improves image brightness, allowing for the reproduction of a broader range of colors with improved uniformity and luminance, surpassing the capabilities of traditional RGB displays.
Implementation Method 1
using dichroic mirrors to separate and direct light beams effectively
Implementation Method 2
a selective color rotator to rotate the polarization of two of the three modulated light beams
Data Source
AI summary
Embodiments of the present invention provide a method, apparatus and system of producing a color image using four or more primary colors. The apparatus, according to some demonstrative embodiments of the invention, may include four or more transmissive spatial light modulators to modulate four or more, respective, primary color light beams in accordance with four or more, respective, primary color image components of the color image to produce four or more, respective, modulated light beams; and a beam combiner to combine the four or more modulated light beams into a combined light beam carrying the color image. The beam combiner may include, for example, an X-cube to jointly direct three of the four or more modulated light beams; and a selective color rotator to rotate the polarization of two of the three modulated light beams, while maintaining the polarization of a third one of the three modulated light beams. Other embodiments are described and claimed.