Liquid Crystal Driving Method for Ionic Impurity Sweep
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in effectively suppressing the influence of ionic impurities, which can cause display issues like burn-in, as previous methods do not consistently sweep these impurities away from the pixel region.
Innovation Solution
A driving method for liquid crystal devices that applies AC signals with shifted phases to multiple electrodes, creating a shifting electrical field to pull and sweep ionic impurities away from the display region, with specific frequency and waveform considerations to ensure effective movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If AC voltage is applied between adjacent electrodes in peripheral electrodes, then ionic impurities can be moved outside the pixel region, but the sweeping effect is not consistently sufficient
Solution Approach 1:
The peripheral electrode is divided into multiple adjacent electrodes (first electrode, second electrode, third electrode, etc.) arranged in sequence from the pixel region outward. This segmentation allows independent voltage control of each electrode, enabling the creation of a directional electrical field that systematically guides ionic impurities from the pixel region through intermediate regions to the outer periphery, achieving more consistent and complete impurity removal.
Solution Approach 2:
Different voltage levels are applied to different electrodes based on their positions. The first electrode (closest to pixel region) receives a first voltage, the second electrode receives a second voltage, and the third electrode receives a third voltage, creating a gradient electrical field. This local differentiation of electrical conditions ensures that ionic impurities experience a consistent directional force throughout the liquid crystal layer, improving the reliability of the sweeping effect.
2Object-affected harmful factors
If peripheral electrodes are used to create horizontal electrical field, then ionic impurities can be moved, but the electrical field direction causes inconsistent sweeping effectiveness
Solution Approach 1:
The system uses dynamic voltage control where AC signals with different phases are applied to adjacent electrodes. The electrical field between electrodes dynamically shifts direction and intensity over time, creating a sweeping motion that effectively moves ionic impurities outward. This dynamic approach maintains relative electrode simplicity while achieving superior impurity removal through temporal voltage variations.
Solution Approach 2:
AC voltages with different phases are applied periodically to adjacent electrodes, creating a time-varying electrical field that systematically pushes ionic impurities from the pixel region toward the periphery. This periodic action ensures consistent impurity removal while maintaining a relatively simple electrode structure, as the same electrodes are reused in a cyclic voltage pattern.
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 sweeps ionic impurities from the display region, improving display quality by reducing the impact of these impurities and preventing issues like burn-in.
Implementation Method 1
A driving method for liquid crystal devices that applies AC signals with shifted phases to multiple electrodes, creating a shifting electrical field to pull and sweep ionic impurities away from the display region
Data Source
AI summary
A liquid crystal device includes a first and second substrate, a sealant, a liquid crystal layer, and a first and second electrode. The first substrate includes a display region in which a plurality of pixel electrodes are aligned in a matrix. The second substrate includes a common electrode. The sealant is disposed between the first and second substrate so as to surround the display region. The liquid crystal layer is interposed between the first substrate, the second substrate and the sealant. The first electrode is disposed between the display region and the sealant. The second electrode is disposed between the display region and the first pixel electrode. The first electrode is supplied a first signal. The second electrode is supplied a second signal. The pixel electrodes are supplied an image signal. A frequency of each of the first and second signals are lower than a frequency of the image signal.