Liquid Crystal Peripheral Electrode Ionic Impurity Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal apparatuses face degradation of display characteristics due to ionic impurities from sealing materials, which are exacerbated by the use of high-luminance light sources, leading to blemishes and burn-in issues.
Innovation Solution
A liquid crystal apparatus design with a pixel electrode in the display region and a first electrode in the peripheral region, where the first electrode is alternately supplied with positive and negative polarity potentials at a frequency lower than the pixel electrode's, ensuring equal length for both polarity periods to attract and hold ionic impurities, thereby reducing blemishes and burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-luminance light source such as a laser light source is used, then bright images can be displayed, but blemish tends to be easily generated in the display region
Solution Approach 1:
The patent extracts and removes ionic impurities from the display region by applying a specific voltage pattern to peripheral electrodes. The voltage pattern creates an electric field that drives ionic impurities outward from the display region, effectively separating the harmful ionic impurities from the functional display area while maintaining high luminance operation.
Solution Approach 2:
The patent applies a periodic voltage pattern to the peripheral electrodes that switches between different polarity states. This periodic action continuously drives ionic impurities out of the display region, preventing their accumulation and subsequent blemish formation, even under high-luminance conditions.
2Reliability
If peripheral electrodes are supplied with high-frequency signals to continuously move ionic impurities out of the display region, then display characteristic degradation is suppressed, but power consumption increases
Solution Approach 1:
The patent employs a dynamic voltage pattern that adapts the frequency and amplitude of signals applied to peripheral electrodes based on the driving conditions. During high-luminance operation when ionic impurity migration is more pronounced, the voltage pattern intensity is increased. During normal operation, the voltage pattern is reduced, optimizing the balance between ionic impurity management and 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
This configuration effectively suppresses blemish and burn-in generation even with high-luminance light sources, maintaining excellent display quality by lengthening the inversion cycle of the electric field to effectively manage ionic impurities.
Implementation Method 1
a first electrode provided in a region outside the display region and configured to be alternately supplied with a positive polarity potential with a potential higher than a predetermined potential and a negative polarity potential with a potential lower than the predetermined potential
Data Source
AI summary
A liquid crystal apparatus includes a liquid crystal layer, a pixel electrode provided in a display region and configured to be supplied with an image signal at a first frequency, and a first electrode provided in a region outside the display region and configured to be alternately supplied with a positive polarity potential with a potential higher than a predetermined potential and a negative polarity potential with a potential lower than the predetermined potential at a second frequency lower than the first frequency such that a positive polarity period in which the positive polarity potential is supplied and a negative polarity period in which the negative polarity potential is supplied have a same length.