Rotating Polarizing Element for Uniform 3D Projection
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Solution Overview
Problem
Existing projection devices suffer from inconsistent polarizing directions of laser beams due to optical elements, leading to disuniformity in color and brightness when displaying 3D images, particularly through polarized 3D glasses.
Innovation Solution
An illumination system incorporating a polarizing rotation module with a rotating polarizing element and a filtering module, where the rotation frequencies of these components are set to ensure the laser and auxiliary beams cover all polarizing directions uniformly, synchronized with the frame rate of the light valve to maintain consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a blue laser diode is used to excite phosphor powder to generate yellow-green light, then the illumination system can provide red-green light more economically, but the single polarizing direction of the laser is damaged by optical elements, causing inconsistent polarizing directions in different regions of the projection screen
Solution Approach 1:
The patent applies the dynamics principle by making the polarizing element rotatable instead of fixed. The polarizing element can rotate around the optical axis, dynamically changing its polarizing direction to compensate for the damage caused by optical elements, thereby maintaining consistent polarizing directions across different regions of the projection screen while preserving the cost-effective laser phosphor illumination approach
Solution Approach 2:
The patent changes the parameter of polarizing direction by introducing a rotatable polarizing element. By adjusting the rotation angle of the polarizing element, the system can modify the polarizing state of the laser beam to compensate for polarization damage, thus resolving the contradiction between cost-effective illumination and polarizing consistency
2Adaptability or versatility
If a polarizing plate is configured in front of the lens to retain beams of specific polarizing directions for 3D image display, then 3D images can be displayed through polarized 3D glasses, but the image exhibits serious disuniformity in color and brightness
Solution Approach 1:
The patent uses a rotatable polarizing element that can dynamically adjust its orientation to ensure uniform polarizing directions across the projection screen. This dynamic adjustment compensates for the polarization damage caused by optical elements, enabling 3D image display through polarized glasses while maintaining uniform color and brightness
Solution Approach 2:
The system incorporates feedback mechanisms to detect and compensate for polarization damage. By monitoring the polarizing state of the laser beam and adjusting the polarizing element accordingly, the system maintains consistent polarizing directions across the screen, ensuring uniform 3D image quality
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 configuration ensures uniform polarizing directions across the projection screen, resulting in improved color and brightness uniformity for 3D images, even when viewed through polarized 3D glasses.
Implementation Method 1
The at least one laser beam passing through the polarizing element has different polarizing states at different times
Data Source
AI summary
An illumination system and a projection device are provided. The illumination system includes at least one laser light source providing at least one laser beam and a polarizing rotation module including a first axle, a first driving element, and a polarizing element. The first axle has a first revolution frequency. The polarizing element is disposed on a transmission path of the laser beam. The first driving element causes the polarizing element to rotate in a temporally sequenced manner. When the polarizing element is rotated, the laser beam is transmitted to the polarizing element at a specific frequency in a plurality of first time periods. The laser beam passing through the polarizing element has different polarizing states at different times. The specific frequency and the first revolution frequency of the first axle are not exactly divisible by each other. The invention can generate an image with uniform polarizing direction.