AMOLED 3D Display Crosstalk Reduction via OLED Blackout Timing
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Solution Overview
Problem
In active-matrix organic light-emitting diode (AMOLED) 3D display systems using polarizing glasses, the liquid crystal polarizing panel's slow reaction time causes image crosstalk, leading to reduced display quality due to the inability to immediately switch between left-eye and right-eye images, resulting in the viewer seeing both images instead of a single image during the transition.
Innovation Solution
The system divides a frame period into two sub-frame periods, with the liquid crystal polarizing panel rotating its molecules between these periods, and OLEDs in the pixel array are turned off to display a black image during the transition, ensuring that only one type of image is visible at a time by switching the polarization angles of the liquid crystal molecules to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal polarizing panel switches the angle of liquid crystal molecules every 8.3 ms to display left-eye and right-eye images alternately, then the 3D stereoscopic effect is achieved, but image crosstalk occurs during the reaction time causing reduced display quality
Solution Approach 1:
The patent applies preliminary action by turning off the OLEDs before the liquid crystal molecules complete their rotation. Specifically, the OLEDs are turned off at a timing that anticipates the incomplete response of the liquid crystal panel, ensuring that no image content is displayed during the transition period when polarization angles are changing, thus preventing image crosstalk
Solution Approach 2:
The patent converts the harmful effect of the liquid crystal response time delay into a beneficial solution by synchronizing the OLED shutdown with the liquid crystal rotation timing. The previously problematic reaction time period is now utilized as a controlled blackout interval that prevents image interference, transforming the system's weakness into an effective timing mechanism
2Adaptability or versatility
If the liquid crystal molecules rotate from one angle to another during sub frame period, then polarization switching for 3D display is achieved, but both left-eye and right-eye images are visible simultaneously causing image interference
Solution Approach 1:
The patent extracts the harmful image content during the polarization transition period by turning off the OLEDs. This separates the useful function (polarization switching for 3D effect) from the harmful effect (image crosstalk during transition), allowing the liquid crystal molecules to rotate freely without displaying interfering image content during the rotation process
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 effectively reduces image crosstalk by ensuring that either the left-eye or right-eye image is displayed exclusively, enhancing the overall display quality by preventing interference between the two images.
Implementation Method 1
the liquid crystal molecules of the liquid crystal polarizing panel are rotated to a specific angle θL; when the AMOLED display panel is displaying right-eye images R, the liquid crystal molecules of the liquid crystal polarizing panel are rotated to another specific angle θR
Implementation Method 2
Polarizing glasses, widely used in I-MAX movie theaters, include two lenses with different polarization (such as a horizontally polarized left-eye lens and a vertically polarized right-eye lens)
Data Source
AI summary
In a 3D display system, an AMOLED display panel is used for alternatively presenting left-eye images and right-eye images associated with specific images, and an LCD polarizing panel is used for providing the left-eye images and the right-eye images with different polarization angles. When the LCD polarizing panel is in the process of rotating its LCD molecules, corresponding OLED rows of the AMOLED display panel are sequentially turned off so as to display black images, thereby preventing crosstalk and improving display quality.