Alternating Electrodes for Ion Trapping in Display Surrounding Areas
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Solution Overview
Problem
In liquid crystal display devices, ion concentration variations due to impurities and sealant dissolution lead to decreased effective voltage in the liquid crystal layer, causing luminance issues such as dark spots on the display.
Innovation Solution
The implementation of a display device structure with alternating first and second electrodes in the surrounding area, closer to the liquid crystal layer than the voltage supply lines, which trap positive and negative ions respectively, preventing their concentration and maintaining uniform voltage across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ions are present in the liquid crystal layer from impurities or sealant dissolution, then the liquid crystal display can be manufactured with standard materials and processes, but the ion concentration increases locally causing decreased effective voltage and luminance reduction leading to dark spots
Solution Approach 1:
The patent extracts harmful ions from the liquid crystal layer by introducing a dedicated ion removal electrode that selectively attracts and removes ions through electrostatic attraction, separating the ion removal function from the display function to maintain display quality while using standard manufacturing materials
Solution Approach 2:
The patent introduces an intermediary ion removal electrode between the voltage supply line and the liquid crystal layer that acts as a mediator to capture ions before they can concentrate and cause dark spots, thereby protecting the display quality without requiring changes to the sealant or liquid crystal materials
2Area of stationary object
If voltage supply lines are placed in the surrounding area, then the display area can be maximized, but ion concentration occurs near the voltage supply lines causing non-uniform voltage distribution and display defects
Solution Approach 1:
The patent applies local quality by placing ion removal electrodes at specific locations near the voltage supply lines where ion concentration is most problematic, creating localized ion removal zones that maintain uniform voltage distribution across the entire display area while preserving maximum display area
Solution Approach 2:
The patent performs preliminary action by positioning ion removal electrodes closer to the liquid crystal layer than the voltage supply lines, so that ions are removed before they can concentrate and cause voltage non-uniformity, preventing display defects before they occur
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 structure effectively prevents ion concentration and maintains display quality by ensuring uniform voltage distribution, reducing the occurrence of dark spots and enhancing overall display performance.
Implementation Method 1
a first electrode and a second electrode provided in the surrounding area and connected to the voltage supply line... The first electrode and the second electrode are alternately arranged in either the first direction or a second direction crossing the first direction. Further, a first voltage supplied to the first electrode is different from a second voltage supplied to the second electrode
Data Source
AI summary
In one embodiment, a display device includes first and second substrates, a liquid crystal layer, a display area, a surrounding area, a light-shielding layer overlapping the surrounding area, a voltage supply line in the surrounding area and extending in a first direction, and first and second electrodes provided in the surrounding area and connected to the voltage supply line. The first and second electrodes are alternately arranged in either the first direction or a second direction crossing the first direction. Further, a first voltage supplied to the first electrode is different from a second voltage supplied to the second electrode.