LCD Frame Narrowing via Overlapping Ground Electrode

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Solution Overview

Problem

Existing liquid crystal display devices face challenges in making the frame narrower while maintaining tolerance to static electricity, as electric charges can intrude into the display region through signal wirings, causing TFT element breakdowns or signal disconnections.

Innovation Solution

A liquid crystal display device design featuring a ground electrode that overlaps with lead-out wirings in the frame region, electrically connected to a transparent conductive film, allowing for a narrower frame without additional space for grounding electrodes, and using a conductive member like conductive paste to ensure electrical connection and discharge of static charges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a ground electrode is arranged in a dedicated space separate from signal wirings, then grounding function is ensured, but frame width increases

Engineering Contradiction:

Improvegrounding functionVSAvoidframe width

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The ground electrode is merged with the lead-out wiring structure by being arranged to overlap the lead-out wiring in the frame region. This integration allows the grounding function to be achieved without requiring separate dedicated space, thereby reducing frame width while maintaining effective grounding capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Instead of arranging the ground electrode in a separate planar space (2D arrangement), the invention utilizes the vertical stacking dimension by placing the ground electrode to overlap the lead-out wiring. This dimensional transition allows both signal transmission and grounding functions to coexist in the same planar region, reducing overall frame width.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If conductive paste is used to connect display surface to electrodes, then space is saved, but static electricity tolerance deteriorates

Engineering Contradiction:

Improveframe areaVSAvoidstatic electricity tolerance

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The lead-out wiring serves as an intermediary structure that provides a low-impedance path for static electricity discharge. By arranging the ground electrode to overlap this conductive path, the invention creates an effective grounding mechanism that can handle static electricity surges, unlike direct conductive paste connections which lack sufficient discharge capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Length of stationary object

If inspection pad is used as ground electrode, then frame can be made narrow, but static charge can intrude into display region through signal wirings

Engineering Contradiction:

Improveframe widthVSAvoidstatic charge intrusion

Core Design Contradiction:

Length of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The invention segments the grounding function from the signal transmission function by creating a separate ground electrode structure that overlaps the lead-out wiring. This segmentation ensures that static charge is discharged through the dedicated ground path rather than traveling through signal wirings into the display region, maintaining both narrow frame and protection against charge intrusion.

Inventive Principle:

Principle #1Segmentation

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 prevents display quality deterioration due to static electricity, allows for a narrower frame, and enhances static electricity tolerance by ensuring that static charges are discharged without affecting the display region.

Implementation Method 1

a conductive member, which is formed to extend across the first substrate and the second substrate to electrically connect the transparent conductive film with the ground electrode

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

prevents display quality deterioration due to static electricity, allows for a narrower frame, and enhances static electricity tolerance by ensuring that static charges are discharged without affecting the display region

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS9785027B2Liquid crystal display device

Publication Date: 2017.10.10 TRIVALE TECHNOLOGIES LLC

AI summary

A liquid crystal display device includes: a first substrate which includes a display region, in which scan wirings and signal wirings intersecting with scan wirings are formed, and a frame region, which surrounds the display region, wherein a lead-out wiring extending from at least one of the signal wiring and the scan wiring and a ground electrode on an insulating layer covering the lead-out wiring are formed in the frame region; a second substrate, which faces the first substrate with interposing a seal, wherein a transparent conductive film is formed on a surface opposite to a side where the liquid crystal is provided; and a conductive member, which is formed to extend across the first substrate and the second substrate to electrically connect the transparent conductive film with the ground electrode, wherein the ground electrode overlaps with at least one of the lead-out wirings.