Liquid Crystal Panel Ground Wiring for Static Discharge Protection
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Solution Overview
Problem
Liquid crystal displays are prone to malfunctions due to electric discharge caused by static electricity, which can lead to the transmission of charges to the common wiring, resulting in failures of the driver IC and other circuits.
Innovation Solution
The configuration includes a liquid crystal panel with a display region and a peripheral region, featuring a first and second ground wiring connected to a ground potential, surrounded by a common wiring, with an insulating film separating them. The sealing material and connecting members are positioned to create a space with a relative dielectric constant smaller than the liquid crystals, reducing capacitance and the migration of charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the common wiring is located in the periphery of the array substrate and extends off the sealing material, then the ease of connection to driver IC is improved, but the risk of electric discharge transmission to driver IC increases
Solution Approach 1:
The patent introduces ground wiring as an intermediary element between the sealing material and the common wiring. This ground wiring acts as a mediator to intercept and divert electric discharge charges to ground potential, preventing them from reaching the common wiring and driver IC. The ground wiring is positioned to extend from the sealing material toward the common wiring, creating a protective intermediary layer that resolves the contradiction between maintaining wiring connectivity and preventing electric discharge transmission.
2Reliability
If ground wiring is added to surround common wiring, then the protection against electric discharge is improved, but the device complexity increases
Solution Approach 1:
The patent merges the ground wiring function with the existing sealing material structure. The ground wiring is integrated into the peripheral region and combines with the sealing material to form a unified protective structure. This merging approach allows the ground wiring to provide electric discharge protection while utilizing the existing structural framework, thereby reducing the increase in device complexity that would result from completely separate protective elements.
3Quantity of substance
If the space between sealing material and connecting member is filled with liquid crystals, then the dielectric constant is increased, but the capacitance between ground wiring increases charge transmission
Solution Approach 1:
The patent applies local quality by creating a space with air (lower dielectric constant) in the specific region between the sealing material and connecting member, while the rest of the liquid crystal display maintains its normal liquid crystal filling. This localized modification of dielectric properties in the peripheral region reduces capacitance between ground wiring and common wiring, thereby reducing charge transmission during electric discharge, without affecting the overall liquid crystal display functionality.
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 effectively reduces the transmission of charges associated with electric discharge to the common wiring, minimizing the risk of malfunctions and failures in the liquid crystal display.
Implementation Method 1
On the common wiring, the first ground wiring, and the second ground wiring, an insulating film is located
Implementation Method 2
a space between the sealing material and the connecting member. The space contains air having a relative dielectric constant smaller than a liquid crystal relative dielectric constant
Data Source
AI summary
An edge portion of first ground wiring and an edge portion of second ground wiring are in contact with a space containing air having a relative dielectric constant smaller than a liquid crystal relative dielectric constant through an insulating film. An edge portion of common wiring and another edge portion of the first ground wiring are in contact with a sealing material having a relative dielectric constant smaller than the liquid crystal relative dielectric constant through the insulating film.