Lateral Field Liquid Crystal Electrostatic Shielding Layer
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Solution Overview
Problem
Liquid crystal devices with lateral electric field modes are prone to display irregularities due to external static electricity, and existing solutions for electrostatic shielding, such as forming an electrostatic shielding layer on the counter substrate, either compromise display quality or make it difficult to achieve a thin device form factor, as they can interfere with the lateral electric field or require post-bonding formation which can damage other components.
Innovation Solution
A liquid crystal device configuration with a light shielding layer, a coloring layer, an overcoat layer, and an alignment film on the counter substrate, where the electrostatic shielding layer is formed on the overcoat layer, spaced apart from the liquid crystal layer, allowing for effective static electricity absorption and reduced interference with the lateral electric field, and enabling the formation of alignment marks for precise masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrostatic shielding layer is formed on the outer side of the glass substrate, then the manufacturing process is simpler, but the device thickness cannot be reduced and other components may be damaged during post-bonding formation
Solution Approach 1:
The electrostatic shielding layer is formed on the inner side of the counter substrate before bonding to the element substrate. This preliminary action allows the shielding layer to be in place before the polishing step, enabling thin device formation without compromising the shielding function or damaging other components during post-bonding formation.
2Length of stationary object
If the electrostatic shielding layer is formed on the inner side of the counter substrate, then the device thickness can be reduced, but the layer may interfere with the lateral electric field mode driving
Solution Approach 1:
The electrostatic shielding layer is formed only in specific areas on the inner side of the counter substrate, particularly in non-display regions or areas where it does not interfere with the lateral electric field. This local quality approach maintains the shielding function while preserving the electric field mode driving capability in critical areas.
3Object-affected harmful factors
If the electrostatic shielding layer is formed close to the liquid crystal layer, then the anti-static electricity measure is effective, but a vertical electric field is generated that disturbs the lateral electric field mode driving
Solution Approach 1:
An insulating layer is introduced as an intermediary between the electrostatic shielding layer and the liquid crystal layer. This intermediary layer maintains the electrostatic shielding function by keeping the shielding layer close to the liquid crystal layer for effective protection, while simultaneously preventing the generation of vertical electric fields that would disturb the lateral electric field mode driving through its insulating properties.
4Manufacturing precision
If the electrostatic shielding layer is formed by vacuum deposition, then the layer quality is high, but the process requires high-temperature and vacuum conditions that may deteriorate other components
Solution Approach 1:
The electrostatic shielding layer is formed on the inner side of the counter substrate before bonding to the element substrate. This preliminary action allows the high-quality vacuum deposition process to be performed when the counter substrate is still accessible, avoiding the need to disassemble the bonded device later. The insulating layer formed subsequently protects other components during the high-temperature and vacuum conditions of the deposition process.
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 enhances electrostatic protection, improves display quality by reducing static-induced irregularities, and allows for a thinner device form factor while maintaining reliable manufacturing processes.
Implementation Method 1
an electrostatic shielding layer formed of a transparent conductive film is formed on the side of the counter substrate so that static electricity is trapped in the electrostatic shielding layer
Implementation Method 2
an electrostatic shielding layer formed of a transparent conductive film
Data Source
AI summary
Provided is a lateral electric field mode liquid crystal device including: a first substrate; a second substrate; a liquid crystal layer and pixel electrodes and common electrodes. A lateral electric field mode liquid crystal device drives the liquid crystal layer by an electric field generated between the pixel electrodes and the common electrodes, a light shielding layer is formed on a surface of the second substrate disposed close to the liquid crystal layer. A coloring layer is also formed so as to overlap with the pixel electrodes. An overcoat layer protects the coloring layer, and an alignment film is formed. An electrostatic shielding layer is formed of a transparent conductive material on a surface of the overcoat layer.