Laser Projection Light Modulation for Distortion-Free Contrast
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Solution Overview
Problem
Current laser projection apparatuses face issues with image distortion due to excessive image processing to enhance contrast, leading to poor display effects.
Innovation Solution
A laser projection apparatus with a light modulation device that modulates illumination beams of different light intensities based on image partitions, using a control unit to adjust light modulation mirrors for coherent or destructive interference, enhancing dynamic contrast without altering the source's luminous brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If image processing algorithms are used to weight gray scale values to enhance image contrast, then the contrast of the projected image is improved, but image distortion occurs due to excessive processing
Solution Approach 1:
The illumination beam is divided into multiple beam partitions, each corresponding to a specific image partition. By independently modulating the light intensity of each beam partition, the system can enhance local contrast without applying excessive global processing that would cause image distortion. This segmentation approach allows precise control over different regions of the image.
Solution Approach 2:
Different beam partitions are modulated to different light intensities based on the specific requirements of corresponding image partitions. This local quality adjustment enables contrast enhancement in specific areas without uniformly processing the entire image, thereby avoiding the distortion that results from excessive global image processing.
2Illumination intensity
If the source is used for illumination with a certain beam size, then the overall illumination is maintained, but the source cannot be partitioned for selective modulation
Solution Approach 1:
The system segments the illumination beam into multiple beam partitions after it leaves the source. This segmentation is achieved through optical elements that divide the beam while maintaining the overall illumination level. Each beam partition can then be independently modulated, providing the needed selectivity without sacrificing overall illumination.
Solution Approach 2:
An intermediary optical system is introduced between the source and the image to partition the beam. This intermediary structure enables selective modulation of different beam portions while preserving the overall illumination provided by the source, thus bridging the gap between maintaining overall illumination and achieving beam selectivity.
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
Improves the display effect by increasing the dynamic contrast of projected images without image distortion, achieved through real-time adjustment of light intensities in illumination beams.
Implementation Method 1
driving a light modulation device to modulate illumination beams provided by a source, wherein at least two beams in the illumination beams modulated by the light modulation device are of different light intensities
Data Source
AI summary
Disclosed by the present application are a laser projection device and projection display method thereof, belonging to the technical field of laser projection. The laser projection device may comprise: a light source, a light modulation device, and a projection lens. The light source is used for providing an illumination beam. The light modulation device is used for modulating the illumination beam, at least two illumination beams being incident on at least two light-reflecting surfaces of the light modulating device, the light-reflecting surface types of the at least two light-reflecting surfaces being different, and the at least two illumination beams after modulation being of different light intensity; the projection lens is used for projecting the modulated illumination beam for imaging. The described laser projection device improves the display of the projected image.