VA LCD Driving Method for 3D Image Spiking and Color Shift
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Solution Overview
Problem
The shutter glass 3D display technology in VA liquid crystal display panels experiences '3D image spiking' due to imbalanced positive/negative voltage, preventing the realization of low color shift and effective 3D display when using the charge-sharing method.
Innovation Solution
A method involving the recombination of scanning signals across pixel rows, where the second scanning line is connected with the first scanning line of a pixel row X cycles ahead, allowing the polarity of image data to be reversed every two frames, and adjusting the sequence of scanning signals in 3D mode to reverse the order of 2D mode sequences, ensuring the second switching unit is always activated before the first in 3D mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the charge-sharing method is used to reduce color shift in VA LCD, then color shift is improved, but 3D image spiking occurs due to imbalanced positive/negative voltage
Solution Approach 1:
The patent dynamically adjusts the scanning signal sequence based on display mode (2D or 3D). In 3D mode, the scanning sequence is reversed compared to 2D mode, ensuring that the second switching unit is activated before the first switching unit. This dynamic adjustment prevents imbalanced voltage accumulation that causes 3D image spiking, while maintaining color shift reduction benefits in 2D mode.
Solution Approach 2:
The patent implements periodic polarity reversal of image data every two frames in 3D mode. This periodic action ensures that pixels experience balanced positive and negative voltage cycles, preventing direct current residue and 3D image spiking. The periodic polarity reversal is synchronized with the shutter glass 3D display timing to maintain image quality without causing display artifacts.
2Reliability
If the polarity of image data is reversed once through each frame cycle, then charge sharing works, but left eye and right eye frames have fixed polarities causing 3D image spiking
Solution Approach 1:
The patent inverts the conventional scanning sequence for 3D mode display. Instead of scanning from first to second switching unit, the sequence is reversed to scan from second to first switching unit. This inversion ensures that the second switching unit is activated before the first, allowing proper charge sharing while preventing fixed polarity issues that cause 3D image spiking.
Solution Approach 2:
The patent changes the scanning signal timing parameters based on display mode. In 3D mode, the scanning sequence is reversed and the activation timing of switching units is adjusted. Specifically, the second switching unit is activated before the first switching unit, and the polarity reversal occurs every two frames rather than every frame. These parameter changes enable both charge sharing functionality and prevention of 3D image spiking.
Data Source
AI summary
A method for driving a liquid crystal display panel is disclosed. In 3D display mode, said method comprising the following steps: providing a scanning signal to a second scanning line of a pixel row N, so as to turn on a second switching unit; and providing, after X scanning cycles, a scanning signal to a first scanning line of the pixel row N to turn on a first switching unit, so that a corresponding pixel unit is charged by image data information of a data line. A polarity of said image data information is reversed once through each two frames. According to the method of the present disclosure, the shutter glass 3D image can be displayed without image spiking, while it is not necessary to change the structures of the liquid crystal display panel, the display panel control circuit, the core panel of the display, and other kinds of hardware.