3D Display Backlight Control for Image Crosstalk Reduction
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Solution Overview
Problem
Existing three-dimensional stereoscopic displays suffer from image crosstalk due to light leaking between left and right eye sub-pixels, caused by the alternating current driving voltage signal changing polarity, leading to increased transmittance in the liquid crystal raster device.
Innovation Solution
A method and system that acquires the current time when the liquid crystal raster device is driven by an alternating current driving voltage signal and shuts down the backlight source during the setting period when polarity changes, preventing image crosstalk by ensuring the display panel displays black during this time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the liquid crystal raster device is driven by an alternating current driving voltage signal, then the display can achieve three-dimensional stereoscopic effect, but image crosstalk occurs due to light leaking when polarity changes
Solution Approach 1:
The patent applies preliminary anti-action by shutting down the backlight source before the polarity change in the alternating current driving voltage signal occurs. Specifically, the backlight is turned off during the setting period of time that encompasses the polarity transition phase, preventing the liquid crystal molecules from deflecting and causing light leakage that would result in image crosstalk. This proactive measure eliminates the harmful effect before it can manifest.
Solution Approach 2:
The patent implements periodic action by synchronizing the backlight shutdown with the periodic polarity changes of the alternating current driving voltage signal. The backlight is repeatedly shut down during each polarity transition cycle (both positive-to-negative and negative-to-positive transitions), creating a periodic control pattern that continuously prevents image crosstalk while maintaining the three-dimensional display function.
2Duration of action of stationary object
If the backlight source remains in normal-open state, then continuous illumination is provided, but light leaking occurs during polarity transition causing image crosstalk
Solution Approach 1:
The patent transforms the continuous backlight illumination into a periodic on-off pattern synchronized with the alternating current driving voltage signal cycles. The backlight is periodically shut down during each polarity transition (both positive-to-negative and negative-to-positive), allowing brief interruption of continuous illumination to prevent light leaking and image crosstalk, while maintaining overall display functionality.
Solution Approach 2:
The patent applies preliminary anti-action by proactively shutting down the backlight source before the polarity change occurs in the driving voltage signal. This preventive measure stops the backlight illumination during the critical setting period when liquid crystal molecules are most susceptible to deflection and light leakage, eliminating the harmful effect before it can occur.
3Stability of the object's composition
If the alternating current driving voltage signal changes polarity, then the liquid crystal molecules rearrange to maintain display function, but transmittance increases causing light to enter incorrect viewing regions
Solution Approach 1:
The patent applies preliminary anti-action by shutting down the backlight source before the polarity change in the driving voltage signal causes liquid crystal molecules to rearrange and deflect. This preventive shutdown occurs during the setting period that encompasses the polarity transition, stopping light emission before it can leak through the deflecting liquid crystal layers and enter incorrect viewing regions, thus preventing image crosstalk.
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 reduces image crosstalk and improves display quality by preventing left and right eye images from entering incorrect viewing regions, enhancing the overall visual experience.
Implementation Method 1
electrons in liquid crystal molecules are rearranged and the liquid crystal molecules deflect, such that a brightness of the light shielded area in the liquid crystal raster device decreases, a transmittance rises
Implementation Method 2
the liquid crystal raster device 3 is an optical device capable of presenting a light shielded area 3a and a light transmitted area 3b arranged periodically and alternatively
Implementation Method 3
the backlight source 1 provides the display panel 2 with backlight, lights emitted from the left eye sub-pixels and the right eye sub-pixels
Data Source
AI summary
Method, apparatus, and system for controlling three dimensional displays are provided. The method comprises: acquiring a current time when a liquid crystal raster device is driven by a AC driving voltage signal; shutting down a backlight source when the current time is within a setting period of time included in an input period of the AC driving voltage signal, wherein the setting period of time refers to a period during which a polarity of the AC driving voltage signal changes such that an image crosstalk is generated when the backlight source is in a normal-open state. Since the backlight source is shut down and stops providing backlight to the panel when the current time is within the setting period, the panel displays black thereby left eye and right eye images are prevented from entering into error regions of view, the image crosstalk is reduced and a display quality is improved.