Double-Modulation Optical System for High-Resolution Projection
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Solution Overview
Problem
Conventional projection display devices with double-modulation optical systems require complex convergence correction devices to align images from multiple projectors, leading to increased manufacturing costs and difficulty in achieving high contrast and high-definition images with high resolving power.
Innovation Solution
A double-modulation optical system that combines modulated primary color lights, separates them into P-polarized and S-polarized lights, and uses separate modulation light generators to enhance contrast without the need for convergence correction devices, allowing a single projector to produce high-definition images with ultrahigh contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple projectors are used to achieve high resolution images, then the resolving power is improved, but the device complexity and manufacturing cost increase due to the need for convergence correction devices
Solution Approach 1:
The patent segments the luminance signal into multiple components (Y1, Y2, Y3, Y4) that are assigned to different modulation devices. This segmentation allows each device to handle a portion of the total luminance information, enabling high-resolution image generation without requiring multiple complete projector systems and their associated convergence correction mechanisms.
Solution Approach 2:
The patent combines the output from multiple modulation devices (handling different color channels and luminance components) into a single integrated optical system. By merging the modulated light paths and using a composite modulation approach, the system achieves high resolving power without requiring separate projector units that would need convergence correction.
2Measurement precision
If multiple projectors are used to achieve high resolution images, then the resolving power is improved, but the manufacturing cost increases
Solution Approach 1:
The luminance signal is segmented into multiple components distributed across different modulation devices within a single projector. This segmentation strategy achieves high resolving power using one projector unit rather than multiple projectors, thereby reducing manufacturing costs while maintaining image quality.
Solution Approach 2:
The modulation devices are designed to handle multiple functions simultaneously - processing different color channels (R, G, B) and multiple luminance signal components (Y1, Y2, Y3, Y4). This multi-functionality eliminates the need for separate dedicated devices, reducing overall system cost while achieving high resolution.
3Device complexity
If conventional optical systems are used, then the structure is simple, but the contrast is insufficient to achieve ultrahigh contrast images
Solution Approach 1:
The patent implements dynamic control of the optical system by using multiple modulation devices that can independently adjust their transmission characteristics. This dynamic capability allows real-time optimization of light modulation for each color channel and luminance component, achieving ultrahigh contrast ratios that static conventional systems cannot attain.
Solution Approach 2:
The system changes multiple optical parameters simultaneously - including polarization states, transmission intensities, and phase relationships - through coordinated control of multiple modulation devices. By dynamically adjusting these parameters, the system achieves ultrahigh contrast while maintaining a relatively simple optical structure compared to conventional approaches.
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 manufacturing costs, simplifies image alignment, and achieves ultrahigh contrast images with 8 k×4 k pixels, eliminating the need for convergence correction devices and enabling easier adjustment and installation of the optical system.
Implementation Method 1
wire grid 21, 29 as polarization split elements
Implementation Method 2
G quarter-wave (λ/4) plate 22 and an R quarter-wave (λ/4) plate 26
Implementation Method 3
B/RG dichroic mirror 16 resolves incident illumination light to a light containing the wave bands of both red light and green light and a blue light
Implementation Method 4
After light modulation at the G device 23 and the R device 27 with green signal and red signal
Data Source
AI summary
An optical system attaining a nearly double resolving power in spite of one projector and also eliminating a convergence device is provided. The system includes an 1:1 relay lens in place of a projector lens of a RGB split-combine projection system, and a quarter-wave plate for P-S polarization separation. In operation, once-modulated RGB composite light is divided into a P-polarized light and a S-polarized light by a PS separation wire grid. The S-polarized light is modulated by a luminance signal Y1 at a Y1 device. The P-polarized light is modulated by a luminance signal Y2 at a Y2 device. The lights modulated by the Y1/Y2 devices are combined with each other at a PS composite wire grid to project a synthetic light on a screen.