Liquid Crystal Display Driving Method Using Dual Gray Level Thresholds
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Solution Overview
Problem
Existing liquid crystal display technologies face challenges in precisely determining the gray level difference threshold value for overvoltage driving, leading to irregular images or inadequate response times due to threshold values being too large or too small.
Innovation Solution
A liquid crystal display driving method that differentiates between high and low gray levels, using distinct predetermined gray level difference threshold values to determine whether overvoltage driving is necessary, thereby activating overvoltage driving only when necessary to avoid incorrect activation and optimize response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gray level difference threshold value is used for overvoltage driving determination, then the device complexity is reduced, but the image quality deteriorates due to irregular images or inadequate response times
Solution Approach 1:
The patent segments the gray level difference threshold determination into two distinct parts: a first threshold for high gray levels and a second threshold for low gray levels. This segmentation allows each threshold to be optimized independently for its specific gray level range, improving image quality while maintaining manageable device complexity through structured differentiation.
Solution Approach 2:
The patent applies local quality by using different threshold values tailored to specific gray level conditions. The first threshold value is applied when the current gray level is high, while the second threshold value is applied when the current gray level is low. This localized approach ensures optimal overvoltage driving determination for each gray level scenario, preventing irregular images and ensuring adequate response times.
2Loss of time
If the gray level difference threshold value is set too small, then the response time is reduced, but image quality deteriorates due to wrong activation causing irregular images
Solution Approach 1:
The patent addresses this contradiction by implementing local quality through condition-specific thresholds. The first threshold value (smaller) is used when the current gray level is high to ensure fast response time, while the second threshold value (larger) is used when the current gray level is low to prevent wrong activation and irregular images. This localized threshold selection optimizes both response time and image quality for different gray level scenarios.
3Manufacturing precision
If the gray level difference threshold value is set too large, then image quality is maintained by avoiding wrong activation, but response time increases due to missed overvoltage driving opportunities
Solution Approach 1:
The patent resolves this contradiction through local quality by applying different threshold values based on the current gray level. When the current gray level is high, the first threshold value (smaller) is applied to enable faster response by activating overvoltage driving more readily. When the current gray level is low, the second threshold value (larger) is applied to maintain image quality by avoiding wrong activation. This localized approach ensures optimal balance between response time and image quality for each gray level condition.
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 ensures precise determination of overvoltage driving for pixel electrodes, preventing irregular images and optimizing response times by setting appropriate threshold values based on gray level differences between current and previous frames.
Implementation Method 1
When a voltage is applied to an electrode, the liquid crystal molecule does not rotate to a target state, but achieves the state after a predetermined response time. When the voltage is higher, the molecule rotates faster.
Implementation Method 2
The aforementioned overvoltage driving technology increases the reaction speed of the liquid crystal molecule through applying an electrical field larger than the one corresponding to the original steady state, to make the liquid crystal molecule rotate to a predetermined angle in less time
Data Source
AI summary
A liquid crystal display driving method provided includes the following steps: acquiring a current gray level value of a current frame image; determining a gray level of the current gray level value; if the current gray level value is the high gray level, then determining whether to perform an overvoltage driving according to a first gray level difference threshold value; if the current gray level value is the low gray level, then determining whether to perform the overvoltage driving according to a second gray level difference threshold value. The present invention can precisely determine whether to perform the overvoltage driving on the pixel electrode.