Liquid Crystal Voltage Control for Motion Blur Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience motion blur when displaying high-speed moving images due to the persistence of the previous frame's image, which is not adequately addressed by simply increasing the liquid crystal's response speed.
Innovation Solution
A display panel structure that includes a first switching element, a liquid crystal capacitor, a compensation capacitor, and a second switching element connected to a compensation gate line, allowing for a voltage reduction from an initial pixel voltage to a compensation pixel voltage via a compensation gate signal, thereby reducing motion blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid crystal's response speed is increased by overdriving with higher voltages, then the response speed is improved, but motion blur still remains in the displayed image
Solution Approach 1:
The patent divides the frame period into multiple sub-periods (first sub-period, second sub-period, third sub-period) and applies different voltage levels to the liquid crystal capacitor in each sub-period. This temporal segmentation allows the liquid crystal to be driven at high voltage initially for fast response, then maintained at lower voltage to reduce persistence effects that cause motion blur, thereby resolving the contradiction between response speed and motion blur elimination.
Solution Approach 2:
The patent dynamically changes the voltage parameter applied to the liquid crystal capacitor over time within each frame period. By varying the voltage from an initial high level (for fast response) to a maintained lower level (to reduce image persistence), the system achieves both fast response speed and reduced motion blur, resolving the technical contradiction through parameter optimization.
2Duration of action of stationary object
If the image of the preceding frame remains on the display for some time, then the sample-and-hold display method is maintained, but motion blur occurs when displaying high-speed moving images
Solution Approach 1:
The patent implements periodic voltage application to the liquid crystal capacitor within each frame period, with distinct first, second, and third sub-periods having different voltage characteristics. This periodic voltage modulation pattern controls the liquid crystal state dynamically, reducing the harmful persistence effect that causes motion blur while maintaining the sample-and-hold display method's benefits.
Solution Approach 2:
The patent applies a preliminary high voltage to the liquid crystal capacitor during the first sub-period to ensure fast initial response, then transitions to a lower maintained voltage during subsequent sub-periods. This preliminary high-voltage action ensures rapid liquid crystal response while the subsequent lower voltage reduces image persistence, thereby preventing motion blur without sacrificing response speed.
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 solution effectively reduces or eliminates motion blur by controlling the voltage of the liquid crystal capacitor, improving the display quality of moving images, and achieves motion blur compensation at lower frequencies compared to prior art, such as 60 Hz operation comparable to 120 Hz and higher frequencies.
Implementation Method 1
a liquid crystal capacitor connected to the first switching element, for being charged with an initial pixel voltage corresponding to the data signal
Implementation Method 2
a voltage lowering part that lowers a voltage of the liquid crystal capacitor to lower a luminance of an image pixel
Data Source
AI summary
A display panel includes a first switching element, a liquid crystal capacitor and a second switching element. The first switching element receives a gate signal and a data signal. The liquid crystal capacitor is connected to the first switching element, and charged with an initial pixel voltage corresponding to the data signal. The second switching element operates in response to a compensation gate signal applied from a compensation gate line. The compensation capacitor is connected to the second switching element to reduce the liquid crystal capacitor's voltage to a value below the initial pixel voltage when the second switching element is turned on. Accordingly, motion blur can be reduced or eliminated.