Liquid Crystal Apparatus Ionic Impurity Trapping
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Solution Overview
Problem
Existing liquid crystal apparatuses face challenges in effectively suppressing the influence of ionic impurities on display quality, as these impurities can diffuse back into the display region when the power is turned off, leading to issues like burn-in and display unevenness.
Innovation Solution
A liquid crystal apparatus configuration with three electrodes (first, second, and third electrodes) receiving alternating current signals of the same frequency, where the signals transition between positive and negative polarities, creating a moving electric field that attracts and traps ionic impurities outside the display region, utilizing a residual direct current to prevent their return when the power is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternating current signals are applied to three electrodes to move ionic impurities from the display region to the outer peripheral section, then ionic impurities are accumulated in the outermost peripheral electrode region, but the accumulated ionic impurities diffuse back to the display region when power is turned off
Solution Approach 1:
The patent applies a preliminary action by accumulating ionic impurities in the outermost peripheral electrode region during the power-on state before the power is turned off. The alternating current signals are applied to move ionic impurities from the display region through the first and second electrodes to the third electrode (outermost peripheral electrode), where they are accumulated in advance. This preliminary accumulation prevents ionic impurities from diffusing back to the display region when power is turned off, as they are already trapped in the peripheral region.
2Loss of energy
If power is turned off after driving, then energy consumption is reduced, but accumulated ionic impurities diffuse back to the display region causing display defects
Solution Approach 1:
The patent performs the ionic impurity accumulation action in advance during the power-on state. By continuously applying alternating current signals to the three electrodes during operation, ionic impurities are progressively moved from the display region to the outermost peripheral electrode region and accumulated there. This preliminary action ensures that when power is turned off to save energy, the ionic impurities are already trapped in the peripheral region and cannot diffuse back to cause display defects.
Solution Approach 2:
The patent maintains continuous useful action by continuously applying alternating current signals to the three electrodes throughout the operation period. This continuous application of electric fields ensures that ionic impurities are continuously moved and accumulated in the outermost peripheral electrode region, creating a persistent trap that remains effective even after power is turned off. The continuous action prevents any gap where ionic impurities could diffuse back to the display region.
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 reduces the impact of ionic impurities on the display, minimizing burn-in and display unevenness by ensuring ionic impurities remain trapped outside the display region even when the power is turned off, maintaining a stable display state.
Implementation Method 1
a transverse electric field is generated between the three electrodes and force for moving the ionic impurities is exerted from the display region toward the outer peripheral section of the display region
Implementation Method 2
ionic impurities also diffuse into the liquid crystal layer from sealing material or a sealant in the manufacturing process of the liquid crystal panel
Data Source
AI summary
A liquid crystal apparatus is provided with a first electrode to which a first signal is supplied, a second electrode provided between the first electrode and sealing material and to which a second signal is supplied, and a third electrode provided between the second electrode and the sealing material and to which a third signal is supplied, in which the reference potential of the third electrode is different from the reference potential of the first electrode and the second electrode.