Projection Display Optical Path Control for High-Speed Frame Switching
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Solution Overview
Problem
Conventional projection display apparatuses experience image blurring and quality degradation when the wobbling element is driven at high-speed, leading to a decrease in image resolution during the switching of sub-frames.
Innovation Solution
A projection display apparatus with an optical path changing unit and a controller that controls the image generation unit and optical path changing unit to maintain the display position of the image light before and after frame transitions, reducing the frequency of optical path changes and ensuring high-resolution video projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wobbling element is driven at high-speed to switch sub-frames, then the display position can be changed, but the image becomes blurred and quality degrades
Solution Approach 1:
The controller predicts the display position where the image light will be displayed after frame transition, and controls the optical path changing unit to move to that position in advance. This preliminary positioning action ensures that when the frame transitions, the image light is already at the correct position, avoiding blurring during the transition.
Solution Approach 2:
The controller receives feedback about the frame transition timing and adjusts the optical path changing unit's operation accordingly. By monitoring the frame signal and calculating the appropriate display position, the system feedbacks to maintain optimal positioning throughout the transition, preventing image quality degradation.
2Manufacturing precision
If the optical path changing unit changes display position frequently, then high-resolution video can be projected, but the frequency of optical path changes increases causing noise and reliability issues
Solution Approach 1:
The controller calculates and prepares the optimal display position for the next frame in advance, based on the video signal and frame transition timing. This preliminary calculation allows the optical path changing unit to move smoothly to the correct position without frequent abrupt changes, reducing noise and improving reliability.
Solution Approach 2:
The system dynamically adjusts the optical path changing unit's operation based on the actual frame transition timing and video content. By making the position change adaptive rather than fixed, the system can minimize unnecessary movements and reduce the frequency of optical path changes while maintaining high video resolution.
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
The solution effectively reduces the frequency of optical path changes, maintains video quality, and improves the reliability of the piezoelectric element, while suppressing noise and maintaining high-resolution video projection.
Implementation Method 1
an optical path changing unit that is provided on an optical path of the image light and changes a display position of the image light on the projection plane
Implementation Method 2
the optical path changing unit includes a glass member that refracts the optical path of the image light and a piezoelectric element that changes the optical path of the image light in response to an applied voltage
Data Source
AI summary
A projection display apparatus includes an image generation unit that generates an image light, an optical system that projects the image light onto a projection plane, an optical path changing unit that changes a display position of the image light on the projection plane, and a controller. The controller generates signals for plural types of sub-frames by dividing spatially a signal for each frame of the video input signal. The controller controls the optical path changing unit to keep the display position of the image light on the projection plane before and after transition of the frame of the video signal, and controls the image generation unit to make a type of a beginning sub-frame in a frame output just after the transition equal to a type of a last sub-frame in a frame output just before the transition.