IPS LCD Static Shielding via Common Electrode Grounding
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Solution Overview
Problem
Conventional in-plane switching mode liquid crystal displays (LCDs) face issues with liquid crystal polarization due to external static electricity, which deteriorates display image quality, especially when the SUS bezel is removed for smaller and more portable devices.
Innovation Solution
The implementation of an in-plane switching mode liquid crystal display with a first and second conductive layer on a substrate, where a common voltage is applied to a transparent common electrode through an electrical connection, forming an induced electric field between the conductive layers to prevent static electricity from affecting the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the SUS bezel is removed to form a small, lightweight and compact device, then the device size and weight are reduced, but the transparent conductive layer cannot be grounded, making it impossible to perfectly shield static electricity
Solution Approach 1:
The patent introduces a common electrode as an intermediary element that serves dual purposes: it functions as part of the display structure and simultaneously acts as a ground terminal for the transparent conductive layer. The electrical connection part (conductive sealant) mediates the connection between the common electrode and the transparent conductive layer, enabling static electricity shielding without requiring the SUS bezel.
Solution Approach 2:
The common electrode is given multiple functions: it serves as an electrical electrode for display operation and simultaneously as a ground terminal for static electricity shielding. This multi-functionality eliminates the need for separate grounding structures like the SUS bezel, enabling compact device design while maintaining shielding effectiveness.
2Object-affected harmful factors
If the transparent conductive layer is coated on the rear surface of the upper substrate and connected to the SUS bezel, then static electricity shielding is achieved, but the device structure becomes complex and bulky
Solution Approach 1:
The common electrode performs dual functions as both a display electrode and a ground terminal, eliminating the need for separate grounding structures. This integration simplifies the device structure while maintaining effective static electricity shielding.
Solution Approach 2:
The patent merges the grounding function with the common electrode structure. The electrical connection part (conductive sealant) combines the functions of sealing and electrical connection, further simplifying the overall device structure by eliminating separate grounding components.
3Device complexity
If the transparent conductive layer is floated without connection to SUS bezel, then the device structure is simplified, but static electricity shielding is impossible, causing liquid crystal polarization
Solution Approach 1:
The common electrode acts as an intermediary that provides the grounding path for the transparent conductive layer. The electrical connection part (conductive sealant) serves as the mediator that establishes the electrical connection between the common electrode and transparent conductive layer, enabling shielding while maintaining structural simplicity.
Solution Approach 2:
The common electrode serves itself as a ground terminal, eliminating the need for external grounding structures. The system uses its own existing components (common electrode and conductive sealant) to provide the shielding function, rather than requiring additional dedicated grounding structures.
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 solution effectively suppresses liquid crystal polarization caused by external static electricity, thereby enhancing the display image quality by creating a shielding effect against static-induced electric fields.
Implementation Method 1
forming an induced electric field between the conductive layers to prevent static electricity from affecting the liquid crystal layer
Implementation Method 2
an electrical connection part is installed to electrically connect the second conductive layer to the transparent common electrode, wherein a common voltage applied to the transparent common electrode is applied to the second conductive layer through the electrical connection part
Data Source
AI summary
Disclosed is an in-plane switching mode liquid crystal display, in which a pixel electrode and a common electrode are formed on the same substrate. The display includes a first substrate having a first conductive layer and second conductive layer, the first conductive layer and second conductive layer formed on each surface of the first substrate; a second substrate has a transparent pixel electrode and a transparent common electrode formed on one surface of the second substrate, facing the second conductive layer; an electrical connection part is installed to electrically connect the second conductive layer to the transparent common electrode, wherein a common voltage applied to the transparent common electrode is applied to the second conductive layer through the electrical connection part. This arrangement prevents generation of static electricity to suppress a whitening phenomenon due to liquid crystal polarization in a liquid crystal layer, thereby improving display image quality.