Recessed Upper Common Electrode for VA LCD Static Discharge
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Solution Overview
Problem
Liquid crystal display devices, particularly vertically aligned (VA) mode LCDs, face challenges in managing static electricity introduction, which can lead to damage and image quality issues due to the lack of effective electrostatic discharge prevention mechanisms.
Innovation Solution
The proposed display device incorporates a recessed upper common electrode design and a conductive sealant with a connection electrode to facilitate the dispersion of static electricity, ensuring it is directed away from sensitive areas and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional upper common electrode design is used, then the device structure is simple, but static electricity can be introduced into the display area causing damage and image quality issues
Solution Approach 1:
The upper common electrode is divided into multiple segments: a first upper common electrode portion extending over the display area and a second upper common electrode portion extending over the non-display area. This segmentation allows different portions to serve different functions - the first portion maintains display functionality while the second portion provides electrostatic discharge pathways, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
A connection electrode is introduced as an intermediary element between the second upper common electrode portion and the lower common electrode. This connection electrode, extending along the sealant, provides a controlled pathway for static electricity to discharge from the upper to lower electrode without directly affecting the display area, thus preventing damage while managing the increased structural complexity.
2Reliability
If the upper common electrode extends over the entire substrate including non-display area, then electrostatic discharge capability is improved, but the risk of static electricity introduction to display area increases
Solution Approach 1:
The upper common electrode is segmented into a first portion over the display area and a second portion over the non-display area. The second portion provides electrostatic discharge capability while the first portion is protected from direct static electricity introduction through the connection electrode mechanism.
Solution Approach 2:
The connection electrode acts as an intermediary that channels static electricity from the second upper common electrode portion through the sealant to the lower common electrode, preventing direct introduction of static electricity into the display area while maintaining discharge capability.
3Reliability
If the upper common electrode is recessed in the non-display area, then static electricity dispersion is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sealant serves as an intermediary medium that facilitates static electricity dispersion from the second upper common electrode portion to the lower common electrode. The connection electrode extending along the sealant provides a controlled pathway that improves static electricity dispersion while the recessed design of the first upper common electrode portion maintains manufacturing feasibility.
Solution Approach 2:
The upper common electrode is designed with different characteristics in different areas: the first portion is recessed in the display area to prevent static electricity introduction, while the second portion extends over the non-display area to provide discharge capability. This local differentiation optimizes both static electricity dispersion and manufacturing considerations.
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 minimizes the introduction of static electricity into the display area, reducing the risk of damage and enhancing image quality by ensuring static charges are safely discharged, thereby improving the reliability and performance of VA mode LCDs.
Implementation Method 1
a conductive sealant with a connection electrode to facilitate the dispersion of static electricity
Data Source
AI summary
A display device comprises an upper base substrate; a lower base substrate which protrudes from the upper base substrate along a first direction in a plan view; a first printed circuit film which is attached to a first pad area in a portion of the lower base substrate protruding from the upper base substrate along the first direction; and an upper common electrode which is disposed between the upper base substrate and the lower base substrate, wherein the first printed circuit film is provided in plural numbers, the first printed circuit films are arranged to be spaced apart from each other along a second direction intersecting the first direction, and the upper common electrode overlapping a space between adjacent first printed circuit films along the first direction is recessed further inwardly in the first direction than the upper common electrode overlapping the first printed circuit film along the first direction.