LCD Frame Rate Control Unit Polarity Balancing
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Solution Overview
Problem
Current frame rate control methods for LCD devices, such as the horizontal 2-dot inversion system, often result in picture quality issues like flickering, noise, and dimness due to an imbalance in the polarity of green sub-pixels, leading to deteriorated display performance.
Innovation Solution
A frame rate control unit and method that shifts the basic FRC pattern by one sub-pixel in the horizontal direction for green and two sub-pixels for blue, generating frame rate control signals to balance the polarity of red, green, and blue sub-pixels, thereby preventing lopsided polarity arrangements that cause defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a horizontal 2-dot inversion system is used for FRC, then the polarity of sub-pixels is inverted to prevent liquid crystal deterioration, but the green sub-pixels receive unbalanced polarity (more positive than negative), causing picture quality defects like flickering, noise, and dimness
Solution Approach 1:
The patent applies different polarity inversion patterns to different color sub-pixels (red, green, blue) rather than using a uniform inversion pattern. Specifically, green sub-pixels are assigned a different FRC pattern offset compared to red and blue sub-pixels, ensuring that each color channel achieves balanced positive and negative polarity distribution. This local differentiation resolves the polarity imbalance issue that causes flickering and noise while maintaining liquid crystal durability.
Solution Approach 2:
The patent introduces asymmetric offset values for different color channels in the FRC pattern generation. Instead of applying the same symmetric inversion pattern to all sub-pixels, the green channel uses a distinct offset (e.g., offset of 2) compared to red and blue channels (offset of 0). This asymmetric approach ensures that the polarity distribution becomes balanced across all color channels, eliminating the harmful effects of unbalanced polarity on picture quality.
2Manufacturing precision
If 8-bit RGB data is processed by an 8-bit data driver, then full color depth is achieved, but the data driver cost becomes very high
Solution Approach 1:
The patent segments the 8-bit color depth information across multiple time frames using FRC technology. Instead of requiring all 8 bits to be processed simultaneously by the data driver, the system divides the color information into multiple frames (e.g., 4 frames), where each frame carries a portion of the color data. This temporal segmentation allows the use of lower-bit data drivers (e.g., 6-bit or 5-bit) while still achieving effective 8-bit color depth through the combination of multiple frames.
Solution Approach 2:
The patent employs periodic frame rate control patterns that cycle through different FRC patterns across multiple frames. By periodically varying the FRC pattern offset for each color channel across frames, the system encodes multiple bits of color information over time. This periodic action enables lower-bit data drivers to effectively handle 8-bit color depth by distributing the color information across the periodic sequence of frames.
Data Source
AI summary
A frame rate control method capable of enhancing picture-quality is disclosed. The frame rate control method generates red, green, and blue frame rate control signals by frame-rate-modulating red, green, and blue frame rate control patterns on the basis of lower-bit red, green, and blue data. The lower-bit red, green, and blue data are extracted from red, green, and blue data. The red, green and blue frame rate control patterns are obtained through a process of shifting basic frame rate control patterns by different sub-pixel numbers in one direction. The basic frame rate control patterns are established for a plurality of frames.