Pixel Driving Method Using Over-Driving Voltage Table
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Solution Overview
Problem
Conventional LCDs suffer from an afterimage phenomenon due to the slower rotation speed of liquid crystal molecules, which limits the responsive time and display brightness, thereby degrading image quality.
Innovation Solution
A pixel driving method that utilizes an over-driving voltage value table to set appropriate driving voltages for sub-pixels, allowing for faster rotation of liquid crystal molecules to achieve desired grayscale values and mitigate the afterimage effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD uses standard driving voltage, then power consumption is low and cost is reduced, but liquid crystal rotation speed is slow causing afterimage phenomenon
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable rather than fixed. The pixel driving unit dynamically selects different driving voltages (first driving voltage for normal operation, second driving voltage for over-driving) based on frame timing requirements, enabling the liquid crystal rotation speed to be optimized for different operational scenarios without excessive power consumption in normal conditions
Solution Approach 2:
The patent implements preliminary action by determining in advance whether over-driving is needed based on the current frame's grayscale values. When afterimage phenomenon is detected or prevention is required, the system proactively applies the second driving voltage in the current frame to ensure the liquid crystal molecules complete their rotation before the next frame, rather than waiting for the problem to manifest
2Reliability
If liquid crystal rotation speed is increased to reduce afterimage, then dynamic image display quality improves, but responsive time requirement increases the complexity of voltage control
Solution Approach 1:
The patent applies local quality by implementing grayscale value-dependent voltage control. Different grayscale values (first grayscale value range requiring over-driving, second grayscale value range not requiring over-driving) are handled with different driving voltages. This localized approach ensures that over-driving is applied only where necessary (to specific sub-pixels with problematic grayscale transitions) rather than uniformly to the entire display, reducing unnecessary complexity
Solution Approach 2:
The patent changes the voltage parameter dynamically based on detected conditions. The pixel driving unit switches between a first driving voltage (standard) and a second driving voltage (over-driving) depending on whether the current frame's grayscale values indicate a need for afterimage prevention. This parameter change approach allows the system to maintain simple operation under normal conditions while achieving improved reliability when needed
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 method effectively reduces the afterimage phenomenon and improves image display quality by enabling faster liquid crystal molecule rotation to achieve the required display brightness and grayscale values.
Implementation Method 1
applying a voltage to two ends of a liquid crystal molecule in a sub-pixel, drives the liquid crystal to rotate for a corresponding angle to generate an image through a corresponding amount of light
Data Source
AI summary
The present application provides a pixel driving method, a device thereof, and a display panel thereof. The method includes: disposing an over-driving voltage value table including sequentially increasing first target grayscale values, second target grayscale values, and third target grayscale values, wherein the first target grayscale values and third target grayscale values has the same over-driving voltage values that corresponding initial grayscale values has; determining the over-driving voltage value corresponding to a grayscale value of a frame to be displayed of a sub-pixel to drive the sub-pixel to emit light.