Autostereoscopic Display 3D Crosstalk Reduction
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Solution Overview
Problem
Autostereoscopic displays using switchable 3D elements suffer from 3D crosstalk and luminance differences due to differences in liquid crystal response times and backlight turn-on/off times, especially when using blinking or scanning backlight driving technologies.
Innovation Solution
An autostereoscopic display with a switchable 3D element that is divided into blocks corresponding to the backlight blocks, where the switchable 3D element's barriers or lenses are shifted in synchronization with the turn-off periods of the backlight blocks, optimizing the liquid crystal response delay and turn-off times to minimize 3D crosstalk and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blinking driving technology is used to simultaneously turn on and off light sources, then image quality is improved by preventing motion blur, but 3D crosstalk is generated due to differences in liquid crystal response times
Solution Approach 1:
The backlight unit is divided into multiple backlight blocks that are sequentially driven along the scanning direction. Each backlight block corresponds to a specific region of the display panel and is controlled independently, allowing synchronization with the liquid crystal response time in different regions to reduce 3D crosstalk while maintaining image quality.
Solution Approach 2:
The patent implements dynamic control of the switchable 3D element by sequentially shifting barriers or lenses in different regions of the display panel according to the scanning direction. This dynamic adjustment synchronizes the 3D element response with the liquid crystal response time, eliminating 3D crosstalk while preserving image quality.
2Speed
If scanning backlight driving technology is used to sequentially turn on backlight blocks, then motion picture response time is improved, but luminance difference is generated due to differences in liquid crystal response times
Solution Approach 1:
The patent applies local quality control by dividing the display panel into multiple regions corresponding to different backlight blocks. Each region's switchable 3D element is controlled with locally optimized timing and shifting parameters that match the liquid crystal response characteristics of that specific region, ensuring uniform luminance across the entire display while maintaining fast motion picture response time.
3Adaptability or versatility
If switchable 3D element is simultaneously turned on and off on entire screen, then 3D effect is achieved, but 3D crosstalk is generated due to difference between liquid crystal response times and switchable 3D element response times
Solution Approach 1:
The switchable 3D element is divided into multiple regions that correspond to the segmented backlight blocks. Each region can be independently controlled and shifted, allowing the system to address the temporal response differences across the display panel while maintaining the overall 3D effect.
Solution Approach 2:
The patent implements preliminary action by pre-shifting the barriers or lenses in each region before the corresponding backlight block is activated. This preliminary positioning ensures that the switchable 3D element is already in the correct state when light is emitted, eliminating 3D crosstalk caused by response time differences while preserving the 3D effect.
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 motion picture response time (MPRT) and 3D crosstalk, enhancing the overall quality of the 3D image by aligning the switchable 3D element's shifts with the backlight block timings, thereby improving luminance and motion blur reduction.
Implementation Method 1
Liquid crystal cells of the active matrix liquid crystal display change a transmittance based on a difference between a data voltage supplied to a pixel electrode and a common voltage supplied to a common electrode, thereby displaying an image.
Implementation Method 2
The switchable 3D element includes a liquid crystal layer and electrodes applying an electric signal to the liquid crystal layer and thus may electrically control liquid crystal molecules.
Data Source
AI summary
An autostereoscopic display and a control method thereof are disclosed. The autostereoscopic display includes a display panel displaying 3D image data, a backlight unit providing light to the display panel, a backlight driver which sequentially drives light sources of the backlight unit along a scanning direction of the 3D image data written to the display panel, a switchable 3D element which forms a barrier or a lens for separating optical axes of left eye image data and right eye image data from the 3D image data, and a 3D element driver which electrically controls the switchable 3D element and shifts the barrier or the lens formed in the switchable 3D element.