Projection Display Device Multi-Angle 3D Frame Rate
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Solution Overview
Problem
Traditional projection display devices face limitations in achieving a high enough frame rate for multi-angle 3D projection, particularly when displaying images with higher bit depths, as they rely on pulse width modulation methods that result in insufficient refresh rates for effective 3D video display.
Innovation Solution
The proposed projection display device employs a spatial light modulator and an angle deflection apparatus to modulate and deflect illumination light corresponding to multiple frames of 2D images at different angles within a shorter second modulation cycle, allowing for a higher refresh rate and improved bit depth display by varying the illumination brightness and modulation time, enabling the synthesis of stereo images from multiple 2D images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional PWM methods are used for projection display, then device complexity is reduced, but frame rate and bit depth display capabilities are insufficient
Solution Approach 1:
The projection display device segments the projection process into multiple modulation cycles, where each cycle projects a portion of the image data at a specific angle. The angle deflection apparatus divides the projection beam into multiple directional components, allowing sequential projection of different image segments to different spatial locations. This segmentation enables high frame rates by processing image data in manageable portions across multiple cycles while maintaining overall image quality.
2Productivity
If PWM methods are used, then ease of operation is maintained, but image refresh rate is insufficient for effective 3D video display
Solution Approach 1:
The projection display device employs dynamic angle deflection during the projection process. The angle deflection apparatus continuously adjusts the projection beam direction according to the modulation cycle, varying the emission angle based on the current processing stage. This dynamic angle adjustment enables the system to achieve high refresh rates by efficiently directing light to different regions of the projection screen in sequence, while the control apparatus manages this complexity automatically to maintain ease of operation.
3Productivity
If multiple frames of 2D images are projected at different angles within a shorter modulation cycle, then frame rate is improved, but device complexity increases due to additional modulation cycles
Solution Approach 1:
The projection display device implements periodic modulation cycles, where each cycle follows a predetermined sequence of projecting image portions at specific angles. The control apparatus generates periodic control signals that repeat the same modulation pattern for each frame, enabling multiple 2D images to be projected at different angles within each cycle. This periodic structure allows the system to achieve high frame rates through repeated, optimized sequences while the control apparatus handles the complexity of coordinating multiple cycles automatically.
4Manufacturing precision
If illumination brightness and modulation time are varied to achieve higher bit depth, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The projection display device utilizes parameter changes in illumination brightness and modulation time to achieve high bit depth precision. The control apparatus dynamically adjusts the brightness level of the light source and the duration of each modulation cycle based on the required grayscale precision. By varying these parameters across multiple modulation cycles, the system can display subtle grayscale differences with high precision. The automated control manages the complexity of coordinating these parameter changes, allowing the system to achieve high manufacturing precision in bit depth display while maintaining ease of operation.
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 enhances the frame rate and bit depth display capabilities, enabling the projection of high-quality stereo images from multiple angles, overcoming the limitations of traditional PWM methods by adjusting illumination brightness and modulation time to achieve smoother grayscale transitions and increased contrast.
Implementation Method 1
a spatial light modulator, configured to modulate the illumination light based on a plurality of frames of 2D images corresponding to a to-be-displayed stereo image, and sequentially emit, in the first modulation cycle, image light corresponding to the plurality of frames of 2D images
Implementation Method 2
an angle deflection apparatus, disposed on an emergent optical path of the image light, and configured to deflect the image light corresponding to the plurality of frames of 2D images to different angles for emission
Data Source
AI summary
Provided is a projection display device for displaying a time period of one frame of stereo image as a first modulation period. The projection display device includes: a light source for emitting illumination light; a spatial light modulator for modulating the illumination light according to a plurality of frames of two-dimensional images corresponding to a stereo image to be displayed, and sequentially emitting, within the first modulation period, image light corresponding to the plurality of frames of the two-dimensional images; an angle deflection apparatus arranged in an emergent optical path of the image light and used for deflecting the image light corresponding to the plurality of frames of two-dimensional images to different angles for emission; and a projection screen for displaying the image light deflected by the angle deflection apparatus.