Liquid Crystal Display Peripheral Electrode Impurity Ion Control
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Solution Overview
Problem
Existing liquid crystal display devices with inorganic alignment films face challenges in suppressing ionic impurity diffusion, leading to display defects like burn-in, despite efforts such as surface modification, ion trap electrodes, and barrier structures, which are either difficult to control or insufficiently effective.
Innovation Solution
A liquid crystal display device design featuring a first and second substrate with a liquid crystal layer, where the peripheral electrodes are formed by adjacent electrodes with different voltage values, creating a horizontal electric field to swiftly move impurity ions out of the pixel area, preventing burn-in and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface modification by ultraviolet-ray irradiation is used to increase surface energy of alignment film in peripheral area, then ionic impurity adsorption is improved, but control difficulty increases
Solution Approach 1:
The patent changes the surface energy parameter of the alignment film by controlling the rubbing direction during alignment film formation. By setting the rubbing direction to be substantially perpendicular to the liquid crystal alignment direction in the peripheral area, the surface energy is increased, enabling effective adsorption of ionic impurities without requiring complex ultraviolet-ray irradiation processes.
2Reliability
If ion trap electrode is provided in peripheral area, then ionic impurity adsorption is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the ion trap function from a separate electrode structure and integrates it into the existing alignment film through directional rubbing control. This eliminates the need for additional ion trap electrodes and their associated manufacturing processes, reducing manufacturing complexity while maintaining effective ionic impurity suppression.
Solution Approach 2:
The alignment film is given multiple functions: it provides liquid crystal alignment control and simultaneously acts as an ion trap through controlled surface energy modification. This multi-functionality eliminates the need for separate ion trap structures, simplifying the overall device manufacturing.
3Reliability
If projection structure is provided between seal material and pixel area, then ionic impurity diffusion barrier is improved, but device complexity increases
Solution Approach 1:
The patent changes the surface energy parameter of the alignment film in the peripheral area through rubbing direction control, creating an effective barrier against ionic impurity diffusion without requiring additional projection structures. This approach maintains structural simplicity while achieving the desired diffusion prevention effect.
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 design effectively suppresses ionic impurity effects, preventing burn-in and achieving higher image quality without significantly increasing manufacturing complexity or costs.
Implementation Method 1
the peripheral electrodes are formed by adjacent electrodes with different voltage values, creating a horizontal electric field to swiftly move impurity ions out of the pixel area
Implementation Method 2
These alignment films control the state of alignment of liquid crystal molecules included in the liquid crystal layer
Data Source
AI summary
Disclosed herein is a liquid crystal display device. The liquid crystal display device includes: a first substrate; a second substrate; a liquid crystal layer; a first electrode part; and a second electrode part. The first electrode part includes a pixel electrode formed in the pixel area and a peripheral electrode formed in the peripheral area. The second electrode part includes a pixel electrode part formed in the pixel area and a peripheral electrode formed in the peripheral area. The peripheral electrode of at least one of the first electrode part and the second electrode part is formed by a plurality of electrodes adjacent to each other. Voltage values of driving voltages applied to the respective electrodes adjacent to each other of the peripheral electrode are different from each other.