Liquid Crystal Display Frame Count Adjustment for Polarity Balance
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Solution Overview
Problem
The application of pause driving to liquid crystal display devices that perform reverse polarity driving can sometimes result in image sticking on the display panel, particularly when the sum of scanning and pause frames is even, leading to a voltage imbalance in liquid crystals.
Innovation Solution
A display device and method that recalculates the number of scanning and pause frames to ensure an odd sum, maintaining a balanced polarity of voltage applied to liquid crystals by reversing the polarity designation signal every frame and adjusting the frame counts to prevent image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If pause driving is applied to liquid crystal display device carrying out reverse polarity driving, then power consumption is reduced, but image sticking occurs on the display panel
Solution Approach 1:
The patent changes the parameter of frame count by making it variable instead of fixed. The control unit adjusts the number of frames in scanning periods and pause periods dynamically to ensure that the cumulative frame count maintains proper polarity balance, preventing image sticking while enabling pause driving for power savings
Solution Approach 2:
The patent introduces dynamic adjustment of frame counts in scanning and pause periods. Rather than using fixed frame counts, the system dynamically modifies the number of frames based on polarity balance requirements, allowing the display to adapt between power-saving pause mode and image quality maintenance
2Ease of operation
If the sum of scanning frames and pause frames is even number, then pause driving can be implemented simply, but voltage polarity becomes unbalanced in liquid crystals
Solution Approach 1:
The patent implements a feedback mechanism where the control unit monitors the cumulative frame count and polarity state, then adjusts subsequent frame counts accordingly. This feedback loop ensures that the system maintains proper polarity balance by detecting when an even sum would cause imbalance and correcting it by adjusting frame counts
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
The solution effectively prevents image sticking on the display panel by ensuring the polarity of the voltage applied to liquid crystals remains balanced, even during extended pause periods, thereby maintaining image quality and reducing power consumption.
Implementation Method 1
This is due to an effect of a capacitance component which is present in each pixel. As a result, voltages applied to liquid crystal in any pause periods are identical to each other
Data Source
AI summary
A polarity inversion control section (9) supplies a polarity designation signal, which designates a polarity of a data signal, to a data line drive circuit (5) while reversing a polarity of the polarity designation signal every frame. Even in a case where a pause driving control section (8) receives a designation signal that designates a sum of the number of frames constituting a scanning period and the number of frames constituting a pause period to be an even number, the pause driving control section (8) maintains the sum of the number of frames constituting a scanning period and the number of frames constituting a pause period to be an odd number.