Pixel Driving Method for High-Frequency LCD Panels
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Solution Overview
Problem
Conventional liquid crystal display panels with high scanning frequencies, such as 120 Hz, face issues with insufficient charge/discharge periods, leading to voltage differences that can damage the image quality due to rapid charging and discharging, particularly when the polarity of the pixel changes.
Innovation Solution
The method involves dividing the charging period into two segments, using a compensated data voltage during the first segment and an ideal data voltage during the second segment, with the selection of appropriate gamma curves based on polarity changes to ensure adequate charging and discharging of the pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the scanning frequency is increased to 120 Hz to reduce image smear, then the image quality is improved, but the charge/discharge period is reduced causing insufficient voltage charging
Solution Approach 1:
The charging period is divided into two segments: a first charging time segment using compensated data voltage and a second charging time segment using ideal data voltage. This segmentation allows the system to achieve both fast response and sufficient charging at 120 Hz scanning frequency.
Solution Approach 2:
The patent changes the voltage parameter by generating compensated data voltage that differs from the ideal data voltage during the first charging segment. This parameter change ensures adequate voltage charging is achieved within the reduced time period at high scanning frequency.
2Reliability
If the charge period is extended to ensure sufficient voltage charging, then the pixel voltage achieves the data voltage, but the scanning frequency must be reduced from 120 Hz to 60 Hz
Solution Approach 1:
The patent applies preliminary action by using compensated data voltage during the first charging segment to prepare the pixel voltage, then transitions to ideal data voltage in the second segment. This preliminary compensation ensures sufficient charging is achieved within the shorter time period required for 120 Hz operation.
3Speed
If the scanning frequency is increased to 120 Hz to improve dynamic image performance, then the response speed is improved, but the image contact is damaged due to voltage difference
Solution Approach 1:
The patent implements feedback by generating compensated data voltage that accounts for the reduced charge/discharge period at 120 Hz. This compensation mechanism ensures the pixel voltage properly achieves the data voltage, preventing image contact damage while maintaining high response speed.
Data Source
AI summary
The invention provides methods of driving a pixel and liquid crystal display panels implementing the methods. The invention generates an ideal data voltage corresponding to a gray level of the pixel, and generates a compensated data voltage corresponding to the gray level according to a polarity change of the pixel. The charging period of the pixel is divided into a first charging time segment and a second charging time segment. The invention charges the pixel by the compensated data voltage during the first charging time segment, and charges the pixel by the compensated data voltage during the second charging time segment.