Shielding Electrode for Ion Control in Liquid Crystal Display Panels

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional liquid crystal display panels experience display mura effects due to ion accumulation from sealant frames, leading to non-uniformity in the display region.

Innovation Solution

Incorporating a shielding electrode in the non-display region, electrically connected to the common electrode, which is positioned between the sealant and the display region to redirect and neutralize ions, thereby preventing electric charge accumulation and shielding electrical influences from the peripheral circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealant frame is used to seal the liquid crystal layer, then the display panel can be properly sealed and assembled, but ions are released from the sealant frame causing electric charge accumulation and display mura effects

Engineering Contradiction:

Improvesealing reliabilityVSAvoidion-induced electric charge accumulation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A shielding electrode is introduced as an intermediary component between the sealant frame and the common electrode. This shielding electrode captures ions released from the sealant frame before they can reach the common electrode and display region, thereby mediating the harmful interaction while maintaining the sealing function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful ions released from the sealant frame are redirected and captured by the shielding electrode, converting the harmful ion flow into a controlled process. The ions that would otherwise cause mura effects are now collected by the shielding electrode connected to the common electrode potential, transforming a detrimental effect into a manageable phenomenon.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Device complexity

If the common electrode is directly exposed to ions from the sealant, then the electrode structure remains simple, but electric charge accumulation occurs in the periphery of the display region

Engineering Contradiction:

Improveelectrode structure complexityVSAvoiddisplay uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The electrode system is segmented into three distinct components: the pixel electrode, the common electrode, and the newly introduced shielding electrode. This segmentation allows the shielding electrode to specifically address ion accumulation issues without requiring complete redesign of the entire electrode system, maintaining reasonable complexity while improving display uniformity.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If no shielding electrode is used, then the device structure remains simple, but display mura effects occur due to ion accumulation

Engineering Contradiction:

Improvestructure complexityVSAvoiddisplay mura effect

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The shielding electrode serves as a mediator positioned between the ion source (sealant frame) and the vulnerable component (common electrode and display region). This intermediary structure captures ions before they can cause display mura effects, providing a straightforward structural solution to a display quality problem.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ion-induced electric charge accumulation in the display region, enhancing the uniformity and quality of the screen display by redirecting ions to the common electrode and shielding electrical influences.

Implementation Method 1

a sealant frame readily releases ions, and an electric field effect is generated in the actuation of the ions and the driver circuit, thus causing accumulation of electric charge in the periphery of the display region

Methodology Applied

Scientific EffectIon movement in electric field: Electrophoresis

Implementation Method 2

the shielding electrode is located between the sealant and the common electrode, and the shielding electrode surrounds the display region

Methodology Applied

Scientific EffectElectrical shielding: Faraday Cage

Data Source

PatentUS9465258B2Display panel having reduced influence of ions released from the sealant frame

Publication Date: 2016.10.11 AU OPTRONICS CORP

AI summary

A display panel having a display region and a non-display region surrounding the display region is provided. The display panel includes a first substrate, a second substrate, a sealant located in the non-display region, and a display medium. The first substrate includes a plurality of scan lines and data lines, a plurality of active devices, a plurality of pixel electrodes, and a common electrode located in the display region. The active devices are electrically connected to the scan lines and the data lines. The pixel electrodes are electrically connected to the active devices. The common electrode is disposed corresponding to the pixel electrodes. The first substrate further includes a shielding electrode located in the non-display region and is electrically connected to the common electrode. The shielding electrode is located between the sealant and the common electrode and surrounds the display region.