Liquid Crystal Display Reversal Driving Control for Flicker and Power
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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 input video signals or vertical frequency in pause driving.
Innovation Solution
A liquid crystal display device that incorporates a reversal driving control mechanism, switching between a first reversal driving technique with a low frequency of spatial polarity reversal and a second technique with a high frequency, based on the input of image signals, to manage pause and refresh frames, thereby controlling the operation of the liquid crystal panel and reducing power consumption while suppressing 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 low refresh rates
Solution Approach 1:
The patent dynamically switches between first reversal driving technique (low spatial polarity reversal frequency) and second reversal driving technique (high spatial polarity reversal frequency) based on whether image signals are being input. This dynamic adaptation allows the system to optimize between power consumption and flicker suppression in real-time, resolving the contradiction between reduced refresh rate and flicker occurrence.
Solution Approach 2:
The patent changes the reversal driving technique parameters (spatial polarity reversal frequency) based on the input state of image signals. When image signals are input, the system switches to appropriate reversal driving techniques to suppress flicker, while maintaining pause driving for power consumption reduction when no signals are input.
2Use of energy by stationary object
If first reversal driving technique with low spatial polarity reversal frequency is used, then power consumption is reduced, but flicker suppression is insufficient
Solution Approach 1:
The system dynamically selects between first reversal driving technique (low spatial polarity reversal frequency for power saving) and second reversal driving technique (high spatial polarity reversal frequency for flicker suppression) based on the presence of image signal input, allowing optimal performance in both conditions.
Solution Approach 2:
The reversal driving technique parameters are changed based on operational conditions: first technique is used during pause frames when no image signals are input, and second technique is used during refresh frames when image signals are input, optimizing both power consumption and flicker suppression.
3Object-affected harmful factors
If second reversal driving technique with high spatial polarity reversal frequency is used, then flicker is suppressed, but power consumption increases
Solution Approach 1:
The system dynamically switches between second reversal driving technique (high spatial polarity reversal frequency for flicker suppression) and first reversal driving technique (low spatial polarity reversal frequency for power saving) based on whether image signals are being input, optimizing the trade-off between flicker suppression and power consumption.
Solution Approach 2:
The patent changes the reversal driving technique parameters based on input conditions: second technique is applied during refresh frames when image signals are input to suppress flicker, while first technique is used during pause frames to minimize power consumption.
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 suppresses flicker occurrence and reduces power consumption by dynamically adjusting the reversal driving technique in response to image signal input frequency, maintaining display quality even at low refresh rates.
Implementation Method 1
AC driving to reverse polarities of pixel voltages (voltages between the pixel electrodes and the common electrode) 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 a frame in which an image signal (DAT) is inputted from an external portion without output of a request signal (RO) for requesting the external portion to input the image signal (DAT) is defined as a first input frame, a reversal driving control portion (10) sets the reversal driving technique in the first input frame to the column-reversal driving while setting the first input frame to a refresh frame defined as a first refresh frame, sets three frames subsequent to the first refresh frame to pause frames, sets a frame subsequent to the final pause frame to a refresh frame defined as a second refresh frame, and sets the reversal driving technique in the second refresh frame to the dot-reversal driving.