Pixel Image Shift Control for Projection Displays
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Solution Overview
Problem
Existing image display apparatuses using temporal axis pixel shift technology improve spatial resolution at the expense of temporal resolution, causing image blur and brightness deterioration in moving images, and are not cost-effective due to the need for increased light modulation devices.
Innovation Solution
An image display apparatus with a control unit that selectively enables or disables temporal axis pixel shift based on whether the images are still or moving, using a pixel image shift unit to improve display resolution for still images without affecting moving images, and without inserting black frames to maintain brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temporal axis pixel shift technology is constantly performed to improve spatial resolution, then display resolution of still images is improved, but temporal resolution deteriorates causing image blur and brightness reduction in moving images
Solution Approach 1:
The patent applies dynamics by making the pixel shift operation adjustable rather than fixed. The control unit dynamically switches between enabling and disabling temporal axis pixel shift based on real-time detection of image type (still image or moving image), allowing the system to adapt its behavior to different display content and resolve the contradiction between spatial resolution improvement and temporal resolution maintenance
Solution Approach 2:
The patent changes the operational parameter of the pixel image shift unit from constant activation to conditional activation. By detecting image characteristics and changing the shift operation state accordingly, the system optimizes display quality for different content types, improving still image resolution when needed while maintaining moving image quality when pixel shift would cause blur
2Reliability
If black representation frame is inserted between plural frames to reduce image blur, then image quality of moving images is improved, but display brightness deteriorates
Solution Approach 1:
The patent extracts and eliminates the black representation frame from the display sequence. Instead of inserting black frames to reduce motion blur, the invention uses alternative methods such as optical super-resolution techniques and intelligent pixel shifting that do not require frame insertion, thereby maintaining display brightness while still improving image quality
Solution Approach 2:
The patent converts the harmful effect of motion blur into a beneficial outcome by using the temporal frequency information of moving images as a guide to disable pixel shifting during motion detection, rather than attempting to correct blur through black frame insertion. This approach maintains brightness while achieving acceptable image quality
3Manufacturing precision
If number of light modulation devices is increased to improve display resolution, then spatial resolution is improved, but cost significantly increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from spatial resolution improvement (increasing pixel count) to temporal dimension utilization. Instead of adding more light modulation devices to increase spatial resolution, the system uses temporal axis pixel shifting and optical super-resolution techniques to achieve higher effective resolution without additional hardware, thereby reducing cost while maintaining or improving display quality
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 enhances display resolution for still images while preventing image blur and maintaining brightness for moving images, without the need for additional light modulation devices or black frames.
Implementation Method 1
a parallel plate is inserted between the light modulation devices and a projection lens at a tilt relative to the normal line of the optical axis, the optical axis is shifted with respect to each field by changing the tilt angle of the parallel plate
Implementation Method 2
a rotating plate having two regions different in refractive index or amount of refraction is obliquely inserted between the light modulation devices and the projection lens, the optical axis is shifted by rotating the rotating plate
Data Source
AI summary
An image display apparatus includes: a light source that outputs light; a light modulation device that has plural pixels arranged in a matrix and modulates the light from the light source; a projection system that projects the light modulated by the light modulation device onto a projection surface; a pixel image shift unit that can shift positions of images of the pixels of the light modulation device projected on the projection surface; and a control unit that controls the light modulation device and the pixel image shift unit, wherein the control unit can switch whether the pixel image shift unit temporally shifts the positions of the images of the pixels or not.