3D Display Signal Processing for Crosstalk Reduction
Solution Overview
Problem
Active shutter-type 3D display technologies face issues with image crosstalk and brightness evenness due to the time required for liquid crystal molecules to rotate, leading to suboptimal 3D viewing effects.
Innovation Solution
A method that generates a monocular frame mixed image signal by combining successive monocular frame image signals with black picture image signals, which is inserted after the monocular frame image signal in the three-dimensional image signal sequence, improving crosstalk reduction and brightness evenness during 3D image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black picture image signals are inserted between left-eye and right-eye images to reduce crosstalk, then image crosstalk is reduced, but brightness evenness deteriorates due to liquid crystal response time delays
Solution Approach 1:
The patent divides the display area into multiple scanning zones (first scanning area and second scanning area) that are updated at different times. The first scanning area displays the current frame while the second scanning area displays the previous frame, creating a segmented transition approach that reduces crosstalk while maintaining brightness evenness through spatial division of the transition process
Solution Approach 2:
The patent performs preliminary action by displaying the previous frame in the second scanning area before the current frame is fully displayed. This overlapping transition approach allows liquid crystal molecules to begin rotating for the next frame earlier, reducing the visibility of crosstalk while maintaining brightness evenness through temporal staging
2Manufacturing precision
If the refresh rate is increased to improve 3D display quality, then image quality improves, but motion blur increases due to vision duration effect
Solution Approach 1:
The patent ensures continuity of useful action by continuously displaying meaningful image content (either current or previous frame) across all scanning areas without inserting black frames. The transition between frames is staged across different scanning areas, maintaining continuous useful visual output that reduces motion blur while preserving image quality
Solution Approach 2:
The patent changes the temporal parameter of frame display by using different display timings for different scanning areas. The first scanning area displays the current frame while the second scanning area displays the previous frame, creating a staggered timing pattern that reduces motion blur through parameter variation in the display sequence
3Speed
If liquid crystal response time is reduced to improve display speed, then refresh rate increases, but brightness evenness deteriorates due to incomplete rotation in lower portions
Solution Approach 1:
The patent segments the display update process into multiple scanning areas with different update timings. The first scanning area updates with the current frame while the second scanning area updates with the previous frame, allowing the display to accommodate slower liquid crystal response times while maintaining overall display speed through spatial segmentation of the update process
Solution Approach 2:
The patent introduces dynamic timing control where different scanning areas are updated at different times based on the liquid crystal response characteristics. The scanning process adapts its timing to match the physical response capabilities of the liquid crystal molecules, maintaining brightness evenness while preserving display speed through dynamic temporal adjustment
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 efficiently reduces image crosstalk and enhances brightness evenness by minimizing the proportion of black picture image signals, resulting in improved 3D display quality.
Implementation Method 1
since deflection of liquid crystal molecules in the display device needs a certain time for response, the liquid crystal molecules in the upper portion of the display device have already started to rotate when the display device starts to display the black picture after displaying the left-eye and right-eye images
Data Source
AI summary
The method of the subject invention for processing a shutter-type 3D image display comprising the steps of: receiving each frame of image signal to be displayed, processing each received frame of an image signal to generate a corresponding 3D image signal sequence that includes monocular frame image signals; generating a monocular frame mixed image signal corresponding to each monocular frame image signal according to a gate line scanning direction of a display device; inserting a corresponding monocular frame mixed image signal after the monocular frame image signal in the 3D image signal sequence to generate a new 3D image signal sequence; and sending the new 3D image signal sequence to the display device.