Liquid Crystal Display Pause Driving Flicker Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices employing pause driving face challenges in reducing power consumption while minimizing flicker occurrence, especially when the refresh rate is low, and existing techniques do not effectively address the frequency of video signal changes or vertical frequency influences on flicker.
Innovation Solution
A liquid crystal display device that incorporates a pause frame between refresh frames, using an image change determination portion to switch between first and second reversal driving techniques based on image change frequency, where the first technique generates a simple polarity reversal pattern for frequent changes and the second technique generates a complex pattern for infrequent changes, thereby controlling the operation of the liquid crystal panel to reduce power consumption and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If pause driving is employed to reduce power consumption, then power consumption is reduced, but flicker is apt to occur at the time of image display
Solution Approach 1:
The patent dynamically adjusts the polarity reversal pattern based on the pause frame rate. When pause driving is employed, the system switches to a polarity reversal pattern that accounts for the reduced refresh frequency, thereby suppressing flicker while maintaining low power consumption. This dynamic adaptation resolves the contradiction between power savings and flicker suppression.
Solution Approach 2:
The patent changes the driving parameters by implementing different polarity reversal patterns corresponding to different pause frame rates. By adjusting the polarity reversal timing and pattern according to the specific pause frame rate being used, the system effectively suppresses flicker while maintaining the power consumption benefits of pause driving.
2Object-affected harmful factors
If a complex polarity reversal pattern is used to suppress flicker, then flicker is suppressed, but power consumption becomes large
Solution Approach 1:
The patent applies different polarity reversal patterns to different regions or time periods based on the pause frame rate. Instead of using a uniformly complex pattern all the time, the system selects appropriate patterns locally adapted to the current operating conditions, thereby suppressing flicker where needed while minimizing unnecessary power consumption.
Solution Approach 2:
The system dynamically selects the polarity reversal pattern based on the pause frame rate. When pause driving is not employed or at higher frame rates, a simpler pattern is used. When pause driving is employed at lower frame rates, a more appropriate pattern is selected to suppress flicker. This dynamic selection avoids the constant power overhead of complex patterns.
3Reliability
If frame-reversal driving is used to suppress liquid crystal deterioration, then liquid crystal deterioration is suppressed, but flicker is relatively apt to occur
Solution Approach 1:
The patent merges the benefits of frame-reversal driving (liquid crystal protection through AC driving) with the benefits of column-reversal or dot-reversal driving (flicker suppression through higher spatial frequency polarity reversal). By combining multiple reversal techniques in a unified driving method that adapts to pause frame rates, the system achieves both liquid crystal durability and flicker suppression.
Solution Approach 2:
The patent uses a composite driving approach that integrates multiple polarity reversal patterns (frame-reversal, column-reversal, dot-reversal) into a unified method. This composite driving strategy selects and combines elements from different reversal techniques to simultaneously achieve liquid crystal protection and flicker suppression, especially under pause driving conditions.
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 approach effectively suppresses flicker occurrence while maintaining low power consumption by adapting the reversal driving technique to the image change frequency, ensuring improved display quality and reduced power usage in liquid crystal display devices performing pause driving.
Implementation Method 1
the liquid crystal has a property that it deteriorates when a DC voltage continues to be applied. Accordingly, in the liquid crystal display device, AC driving to reverse polarities of pixel voltages has been performed in order to suppress deterioration in liquid crystal
Data Source
AI summary
In a liquid crystal display device for performing pause driving, occurrence of flicker is effectively suppressed while an increase in power consumption is suppressed.When an image change determination portion (11) detects an image change in a period from the previous refresh frame until generation of a predetermined number of times of pause frames, a reversal driving control portion (13) sets the next frame after a frame where an image change has been detected to a refresh frame where a reversal driving technique is a column-reversal driving. When the image change determination portion (11) does not detect an image change in the period from the previous refresh frame until generation of the predetermined number of times of pause frames, the reversal driving control portion (13) sets the next frame after the final pause frame to a refresh frame where a reversal driving technique is a dot-reversal driving.