Polarizer Conductive Layer Dissipates Static Electricity

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Solution Overview

Problem

The film peeling process in ADS display panel manufacturing generates static electricity, leading to polarization of liquid crystals and uneven brightness (mura), which existing methods fail to effectively dissipate, resulting in bad quality products.

Innovation Solution

A polarizer structure with a conductive layer attached to its periphery, allowing static electricity to be dissipated to ground, comprising a main body layer, protective film layer, and release film, with a conductive adhesive layer for enhanced conductivity and electrostatic discharge paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the film is peeled off during the manufacturing process, then the protective film is removed to complete the assembly, but static electricity is generated causing polarization of liquid crystal and mura defects

Engineering Contradiction:

Improvefilm peeling processVSAvoiddisplay quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces a conductive layer that converts the harmful static electricity generated during film peeling into a beneficial effect by providing a discharge path. The conductive layer with conductivity of 10^-6 to 10^-3 S/m allows static electricity to be rapidly dissipated to ground, transforming the harmful electrostatic charge into a controlled electrical conduction process that prevents liquid crystal polarization and mura defects.

Inventive Principle:

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

Solution Approach 2:

The conductive layer acts as an intermediary element between the insulating protective film and the ground. It provides a controlled medium for charge transfer, allowing static electricity to be safely conducted away from the liquid crystal layer through the conductive layer to ground, preventing direct discharge that would cause display defects.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conductive tapes are applied manually to connect CF, ITO and outer frame, then electrostatic discharge paths are provided, but the assembly process becomes complex and prone to random defects

Engineering Contradiction:

Improveelectrostatic dischargeVSAvoidassembly process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the electrostatic discharge function with the existing polarizer structure by integrating a conductive layer into the polarizer assembly. This consolidation eliminates the need for separate conductive tapes and manual connection steps, reducing assembly complexity while maintaining reliable electrostatic discharge paths from the liquid crystal layer to ground.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The conductive layer in the polarizer serves multiple functions: it provides electrostatic discharge paths, maintains structural integrity of the polarizer assembly, and ensures consistent electrical connection without requiring additional components. This multi-functionality simplifies the overall assembly process while reliably preventing electrostatic damage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If modules are assembled instantly after film peeling, then productivity is improved, but static electricity cannot be dissipated leading to unrecoverable mura

Engineering Contradiction:

Improveassembly speedVSAvoiddisplay uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The conductive layer is pre-installed in the polarizer structure before assembly, creating ready-made electrostatic discharge paths. This preliminary preparation allows modules to be assembled instantly after film peeling without delay for electrostatic protection setup, maintaining high productivity while ensuring display uniformity through immediate charge dissipation capability.

Inventive Principle:

Principle #10Preliminary action

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

Reduces the occurrence of electrostatic mura, simplifies the assembly process, and decreases the likelihood of bad quality products by effectively dissipating static electricity during film peeling.

Implementation Method 1

a conductive layer attached to a periphery of the main body layer... the generated static electricity can be diffused to a grounded periphery through the conductive layer

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

a conductive diffusion parameter of the pressure-sensitive adhesive layer is greater than a preset threshold

Methodology Applied

Scientific EffectConductive diffusion: Diffusion

Data Source

PatentUS10459275B2Polarizer, manufacturing method thereof, display panel and display device

Publication Date: 2019.10.29 BOE TECHNOLOGY GROUP CO LTD

AI summary

The embodiments of the present invention provide a polarizer, a manufacturing method thereof, a display panel and a display device, to avoid mura caused by the film peeling process of the polarizer, thereby reducing the probability of bad quality products, simplifying the assembly process, and preventing the omission of conductive attachment. The polarizer includes a main body layer, a protective film layer, a conductive layer and a release film. A first surface of the main body layer is attached with the protective film layer. A second surface of the main body layer is attached with the release film. A periphery of the main body layer is attached with the conductive layer.