Laser Light Source Module Intensity Balancing for 3D Projection
Solution Overview
Problem
Conventional 3D projectors often suffer from an imbalance in the intensity of horizontally and vertically polarized light, leading to inconsistent brightness and color in the images projected for the left and right eyes, which can result in a discontinuous 3D display experience without the use of a depolarizer, and the cost of such a depolarizer is substantial.
Innovation Solution
A projection display system with independently controllable first and second laser light source modules, which are adjusted by a control circuit to match the intensity of horizontally and vertically polarized light, eliminating the need for a depolarizer by using a measuring instrument to monitor and adjust the light energy output based on measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a depolarizer is provided in the lighting system to homogenize the intensity of polarized light, then the brightness consistency between left and right eye images is improved, but the component cost increases substantially
Solution Approach 1:
The patent removes the depolarizer component from the lighting system entirely. Instead of using a depolarizer to homogenize polarized light intensity, the invention extracts only the necessary function by independently controlling the intensity of each laser light source module through separate drive circuits, thereby achieving brightness consistency without the expensive depolarizer component.
Solution Approach 2:
The patent changes the control parameter approach by independently adjusting the drive current parameters for each laser light source module. The control circuit monitors the intensity of polarized light and dynamically adjusts the drive current to each laser module, changing the physical parameter (current) to achieve intensity homogenization without additional optical components.
2Illumination intensity
If the output of laser light source modules is not exactly the same, then the intensity balance between horizontally and vertically polarized light deteriorates, but adding a depolarizer to fix this increases component cost
Solution Approach 1:
The patent implements a feedback control mechanism where the control circuit continuously monitors the intensity of polarized light output and adjusts the drive current to each laser light source module accordingly. This closed-loop feedback system automatically compensates for intensity differences between horizontally and vertically polarized light without requiring a depolarizer.
Solution Approach 2:
The system performs self-adjustment by using the control circuit to automatically detect and correct intensity imbalances between laser modules. The system serves itself by monitoring its own output and making real-time corrections to maintain intensity balance, eliminating the need for external depolarizing components.
3Manufacturing precision
If independent control of each laser light source module is implemented to balance polarized light intensity, then image uniformity is improved, but the control system complexity increases
Solution Approach 1:
The control circuit performs multiple functions: it drives the laser light source modules, monitors the intensity of polarized light, and adjusts drive currents to maintain intensity balance. By making the control circuit multi-functional, the patent achieves precise image uniformity without adding separate control devices, thereby managing system complexity efficiently.
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 ensures a smooth, uniform 3D image is produced by balancing the intensity of polarized lights, eliminating the need for a depolarizer and reducing component costs, while allowing for automatic or manual adjustment of light energy to achieve optimal image quality.
Implementation Method 1
The laser light source has a first laser light source module and a second laser light source module, for providing a laser light
Implementation Method 2
The image light includes a first polarized light and a second polarized light
Data Source
AI summary
A projection display system having a projector, the projector includes a laser light source, a lighting system, and a control circuit. The laser light source has a first laser light source module and a second laser light source module. The first and second laser light source modules provide laser light. The lighting system converts the laser light into image light for displaying an image. The image light includes first polarized light and second polarized light. The control circuit controls the laser light source and the lighting system. The control circuit independently controls the light energy output by the first and second laser light source modules to change the intensity of the first and second polarized light.