3D LCD Control Module Synchronizing Polarity Inversion With Refresh Frequency
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Solution Overview
Problem
Conventional liquid crystal displays with shutter glasses experience motion blur and residual DC voltage when switching between two-dimensional and three-dimensional modes due to residual DC voltage caused by different data voltages for right-eye and left-eye images.
Innovation Solution
A liquid crystal displayer with a control module that adjusts the refresh frequency and inverts signal polarity using a timing controller, with the period of the inversion clock being N times the period of the frame clock, where N is a positive integer greater than 1, to manage the display in both two-dimensional and three-dimensional modes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional polarity inversion scheme is applied in a 3D liquid crystal displayer, then the display can operate in three-dimensional mode with shutter glasses, but residual DC voltage is generated due to different data voltages between right-eye and left-eye images, causing motion blur and glitter
Solution Approach 1:
The patent applies periodic polarity inversion to the liquid crystal display signals. By inverting the polarity of data voltages applied to pixel electrodes in alternating frames, the accumulation of residual DC voltage is prevented. This periodic action ensures that positive and negative voltage contributions balance out over time, eliminating motion blur and glitter while maintaining 3D display functionality with shutter glasses
Solution Approach 2:
The patent implements polarity inversion by applying reversed voltage polarity to the liquid crystal cells in alternating frames. Instead of maintaining consistent voltage polarity, the system inverts the sign of data voltages between consecutive frames, which counteracts the residual DC voltage buildup caused by different right-eye and left-eye image data voltages, thereby resolving the harmful effects while preserving 3D display capability
2Productivity
If the refresh frequency is increased to exceed 120 Hz for proper 3D display with shutter glasses, then right-eye and left-eye images can be displayed interlacedly, but the complexity of controlling polarity inversion increases
Solution Approach 1:
The patent divides the display system into separate timing controllers for left-eye and right-eye images, with independent polarity inversion control for each. This segmentation allows the system to handle high refresh frequencies by processing alternating frames for each eye separately, applying polarity inversion selectively to maintain simplicity in control logic while achieving the required >120 Hz refresh rate for proper 3D shutter glass operation
Data Source
AI summary
A liquid crystal displayer and control method thereof are disclosed. The liquid crystal displayer capable of displaying image in a three dimensional mode comprises a display panel, a first timing controller, a second timing controller and a control module. The first timing controller and the second timing controller are electrically coupled to the display panel. While receiving multiple frames, the control module controls the first timing controller according to a refresh frequency of the frames, to feed the frames to the panel based on a frame clock, and controls the second timing controller to invert the signal polarity of the frames based on an inversion clock.