Driving Chip Dummy Pads for Stable Contact Resistance

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The increase in contact resistance at output pads of a driving chip in display devices leads to vertical line defects, causing pixels to appear brightly or darkly, which deteriorates display quality.

Innovation Solution

The implementation of dummy pads that output variable voltages adjacent to output pads, maintaining contact resistance and preventing electrochemical corrosion in high-temperature and high-humidity environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dummy pads are added adjacent to output pads, then contact resistance stability is improved, but device complexity increases

Engineering Contradiction:

Improvecontact resistance stabilityVSAvoidpad structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Dummy pads are introduced as intermediary elements adjacent to the output pads. These dummy pads serve as mediator structures that prevent electrochemical corrosion between the output pad and surrounding environment, thereby stabilizing contact resistance without requiring fundamental changes to the output pad structure itself

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The dummy pads are configured to output voltages in advance (before potential corrosion issues arise) to prevent electrochemical reactions. By establishing a preliminary voltage state that counteracts corrosion tendencies, the contact resistance is protected before degradation can occur

Inventive Principle:

Principle #10Preliminary action

2Reliability

If dummy pads outputting variable voltages are implemented, then electrochemical corrosion is prevented, but device complexity increases

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidvoltage control complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dummy pads are configured to output variable voltages that can be adjusted according to different operating conditions. By changing the voltage parameter dynamically, the system adapts to prevent electrochemical corrosion under varying environmental conditions such as temperature and humidity changes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The voltage output from dummy pads is made dynamic rather than fixed. The voltage can be adjusted in real-time based on operational requirements and environmental conditions, providing adaptive corrosion protection that responds to changing conditions without requiring complex external control systems

Inventive Principle:

Principle #15Dynamics

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

Prevents the increase in contact resistance, thereby eliminating vertical line defects and improving display quality by ensuring consistent voltage output.

Implementation Method 1

maintaining contact resistance and preventing electrochemical corrosion in high-temperature and high-humidity environments

Methodology Applied

Scientific EffectElectrochemical corrosion:

Data Source

PatentUS12382803B2Driving chip and display device including the same

Publication Date: 2025.08.05 SAMSUNG DISPLAY CO LTD

AI summary

A driving chip includes a plurality of output pads arranged along a first direction and a second direction crossing the first direction, where the plurality of output pads outputs a data voltage, and a plurality of dummy pads positioned in the first direction from the plurality of output pads and arranged along the first direction and the second direction. A plurality of adjacent dummy pads adjacent to the plurality of output pads in the first direction, among the plurality of dummy pads, outputs a variable voltage.