Pixel Shifter Driving Method for High Frame Rate Projection
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Solution Overview
Problem
High-frame-rate image projection systems face challenges in maintaining image quality due to the limitations of actuators in supporting high frame rates, leading to pixel shift unavailability and image blurring.
Innovation Solution
An image projection apparatus with a controller that adjusts the driving method of a pixel shifter based on the frame rate of the image signal, allowing for high-resolution and high-quality projection images by optimizing pixel shift operations, including data exchange methods to manage response lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the frame rate of the projection image is increased, then the image quality and resolution are improved, but the actuator cannot support the high frame rate causing image blurring
Solution Approach 1:
The patent applies dynamics by making the pixel shift operation adjustable based on frame rate conditions. The pixel shift amount is dynamically changed: at low frame rates, a larger shift amount is used to improve resolution; at high frame rates, the shift amount is reduced or suspended to prevent blurring. This dynamic adaptation resolves the contradiction between frame rate and image quality.
Solution Approach 2:
The patent changes the parameter of pixel shift amount based on frame rate conditions. By varying this parameter dynamically - using larger shift amounts when frame rate is low and smaller or zero shift amounts when frame rate is high - the system optimizes both resolution enhancement and image quality maintenance across different operating conditions.
2Manufacturing precision
If pixel shift is performed to improve resolution, then the projection image resolution is enhanced, but the actuator response lag causes blurring at high frame rates
Solution Approach 1:
The patent applies partial action by selectively applying pixel shift only when conditions permit. Instead of continuously performing pixel shift at maximum amount, the system applies partial pixel shift (reduced amount) or suspends it entirely when frame rate is high, thereby preventing the harmful effects of actuator response lag while maintaining resolution benefits when possible.
Solution Approach 2:
The pixel shift operation transitions from a static fixed-amount operation to a dynamic variable-amount operation that adapts to frame rate conditions. This dynamic adjustment allows the system to optimize between resolution enhancement and response time limitations.
3Ease of operation
If the actuator drives the plane-parallel plate to change tilt angle for pixel shift, then the optical path is changed to shift pixels, but the actuator cannot keep up with high frame rates
Solution Approach 1:
The patent makes the pixel shift operation dynamic by adjusting the shift amount based on frame rate. At high frame rates where the actuator cannot respond quickly enough, the system dynamically reduces or suspends the pixel shift operation, thereby maintaining operational simplicity while accommodating the actuator's speed limitations.
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
Enables high-resolution and high-quality projection images by effectively managing pixel shifts and frame rates, reducing image blurring and maintaining image quality even at high frame rates.
Implementation Method 1
a shifter configured to shift a plurality of pixels of the projection image by changing an optical path of the image light
Data Source
AI summary
An image projection apparatus configured to project image light and to display a projection image includes a light modulation element driven according to an image signal and configured to modulate incident light to generate the image light, a shifter configured to shift a plurality of pixels of the projection image by changing an optical path of the image light, and a controller configured to control driving of the shifter. The controller changes a driving method of the shifter according to a frame rate of the image signal.