Conductive Coating on Robot End Effector Fingers for ESD Prevention

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Solution Overview

Problem

Electrostatic discharge (ESD) occurs between large area substrates and the end effector pads during the processing of flat panel displays, leading to yield issues and localized destruction of devices.

Innovation Solution

The end effector includes a wrist with substrate support members featuring a conductive coating and a conductive path to the base plate, allowing for the dissipation of static charge and minimizing ESD.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If insulative substrate support members are used, then substrate support is achieved, but electrostatic discharge occurs between the substrate and end effector pads

Engineering Contradiction:

Improveelectrostatic discharge preventionVSAvoidelectrostatic discharge damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The support members have different electrical properties at different locations: the bulk material remains insulative for support, while the surface contact areas are made conductive through coatings to prevent ESD. This local differentiation resolves the contradiction between support function and ESD prevention.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The support members use composite structures combining insulative base materials (ceramic, glass, or polymer) with conductive surface coatings (metallic or conductive ceramic). This composite approach allows simultaneous achievement of mechanical support and electrostatic discharge prevention.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conductive pads are added to substrate support members, then ESD is prevented, but device complexity increases

Engineering Contradiction:

Improveelectrostatic discharge preventionVSAvoidend effector structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The conductive coating is integrated directly onto the surface of the support members, merging the support function and ESD prevention function into a single component. This eliminates the need for separate conductive pads and reduces overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The support members serve multiple functions simultaneously: mechanical support, friction-based positioning, and electrostatic discharge prevention through their conductive surface coatings. This multi-functionality reduces the need for additional components.

Inventive Principle:

Principle #6Universality (Multi-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

The solution effectively reduces the occurrence of electrostatic discharge, preventing damage to devices on the substrate and improving the yield of flat panel display processing.

Implementation Method 1

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS20250178219A1ESD prevention by resistive coatings of robot end effector fingers and conductive pad

Publication Date: 2025.06.05 APPLIED MATERIALS INC

AI summary

An end effector for a substrate supporting and transferring system includes a wrist, a plurality of electrically insulative substrate support members extending from the wrist and having a proximal portion supported therein, the substrate supporting member including a substrate facing surface, a conductive coating, and at least a first conductive member disposed upon and in electrical contact with the conductive coating, the conductive coating extending from the conductive member to the proximal end of the support member; and a connection member extending between the conductive coating and the wrist. In one aspect, the conductive member includes a conformable or compliant conductive element, coupled to a conductive plate.