Liquid Crystal Display Driving Method for Flicker Reduction
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Solution Overview
Problem
Liquid crystal display panels face issues with residual images and flicker due to the 28SPOL inversion method, which causes asymmetrical charging of sub-pixels and results in direct current bias voltage, leading to line residual images and visible flicker.
Innovation Solution
A driving method for liquid crystal display panels that divides display time into predetermined periods, alternately switching odd-numbered and even-numbered frame pictures, and adjusts gray-level tables to minimize brightness differences between frames, using a first gray-level table for other frames and a second gray-level table for the first frame, with the second gray-level values being smaller than the corresponding first gray-level values to maintain consistent charging duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 28SPOL inversion method is used to switch polarity of driving voltage, then the liquid crystal molecules can be prevented from polarization, but it causes asymmetrical charging of sub-pixels resulting in direct current bias voltage, leading to line residual images and visible flicker
Solution Approach 1:
The patent adjusts gray-level values as parameters to compensate for the direct current bias voltage caused by 28SPOL inversion. By dynamically changing gray-level values between different frame types (odd-numbered vs even-numbered frames), the patent balances the charging duration and eliminates the harmful effects while maintaining the polarity switching benefit
Solution Approach 2:
The patent introduces asymmetrical gray-level adjustment where odd-numbered frames and even-numbered frames use different gray-level values. This asymmetrical compensation strategy specifically addresses the asymmetrical charging problem caused by 28SPOL inversion, balancing the charging duration for different sub-pixel groups
2Reliability
If alternating current driving mode is adopted to switch driving voltage polarity, then liquid crystal molecule polarization is prevented, but residual images occur due to asymmetrical charging duration of sub-pixels
Solution Approach 1:
The patent dynamically adjusts gray-level values as compensating parameters based on the frame number (odd or even). This parameter adjustment equalizes the charging duration for different sub-pixel groups, eliminating residual images while preserving the AC driving benefit of preventing liquid crystal polarization
Solution Approach 2:
The patent implements a feedback mechanism where the gray-level values are adjusted based on the detected frame type and the known charging characteristics of the display panel. This feedback loop ensures that the compensation is continuously applied to maintain equal charging duration and eliminate residual images
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 method effectively reduces or eliminates flicker and line residual images by ensuring consistent brightness across frames, enhancing display quality and reducing the impact of 28SPOL inversion.
Implementation Method 1
A driving voltage for each of the plurality of sub-pixels is adjusted to control the rotation of liquid crystal molecules
Implementation Method 2
an alternating current driving mode is generally adopted, that is, the driving voltage for each of the plurality of sub-pixels is repeatedly switched between a positive polarity and a negative polarity
Data Source
AI summary
The present disclosure provides a driving method for a liquid crystal display panel and a non-transitory computer storage medium. The driving method includes: for the plurality of sub-pixels, adopting a first gray-level table for displaying a picture in other frame pictures other than a first frame picture in each of the plurality of predetermined periods, the first gray-level table including a plurality of first gray-level values; and adopting a second gray-level table for displaying a picture in the first frame picture in each of the plurality of predetermined periods, the second gray-level table including a plurality of second gray-level values.