PCB TIM Cover Structure for Visible Fill Monitoring and Containment

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Solution Overview

Problem

Existing electronic devices face challenges in effectively dissipating heat due to their high performance, which can affect product stability and reliability, and current heat dissipation techniques using liquid thermal interface materials (TIM) lack efficient containment and monitoring mechanisms.

Innovation Solution

A printed circuit board (PCB) structure incorporating a thermal interface material (TIM) with a cover structure that includes a transparent visible layer to monitor filling and prevent discharge, comprising a mounting layer, support layer, and visible layer to ensure proper TIM distribution and containment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a liquid thermal interface material (TIM) is injected into the inner space of an electronic device for heat dissipation, then heat dissipation performance is improved, but the TIM may be discharged to the outside through monitoring holes affecting product stability

Engineering Contradiction:

Improveheat dissipation performanceVSAvoidproduct stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent employs a transparent cover structure comprising multiple layers including a visible layer that acts as a barrier to contain the liquid TIM within the PCB structure. This thin film approach allows optical monitoring while preventing TIM discharge, resolving the contradiction between heat dissipation effectiveness and product stability.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The transparent cover structure serves as an intermediary element between the TIM and the external environment. It allows light transmission for monitoring purposes while simultaneously preventing TIM from being discharged outward, thus maintaining both heat dissipation performance and product reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If monitoring holes are formed through the PCB structure to observe TIM filling, then filling monitoring capability is improved, but TIM may escape through these holes

Engineering Contradiction:

ImproveTIM filling monitoring capabilityVSAvoidTIM discharge

Core Design Contradiction:

Measurement precisionVSLoss of substance

Solution Approach 1:

The transparent cover structure with multiple layers including a visible layer replaces the traditional open monitoring hole design. This allows optical observation of TIM filling while the layered film structure prevents TIM from escaping through the monitoring region, simultaneously achieving monitoring precision and preventing substance loss.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The transparent cover structure acts as an intermediary that permits optical monitoring of TIM filling status while blocking the physical escape path of the TIM. The monitoring holes pass through this intermediary barrier, enabling observation without compromising containment.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the PCB structure is sealed completely to prevent TIM discharge, then product stability is improved, but monitoring capability is lost

Engineering Contradiction:

Improveproduct stabilityVSAvoidTIM filling monitoring capability

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The transparent cover structure provides a sealed containment solution using multiple transparent layers that prevent TIM discharge while maintaining optical transparency. This allows the structure to be completely sealed for reliability while enabling visual monitoring of TIM filling through the transparent materials.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The transparent cover structure serves as an intermediary that reconciles the conflicting requirements of complete sealing and monitoring. It provides a barrier that prevents TIM discharge while its transparent properties allow optical monitoring of the internal TIM filling status.

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

The solution provides effective heat dissipation by containing TIM within the PCB structure, allowing for efficient heat transfer and monitoring, thereby enhancing the stability and reliability of electronic devices.

Implementation Method 1

the visible layer blocks the TIM from being discharged to an outside of the PCB structure through the monitoring hole

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 2

The PCB structure provides effective heat dissipation by containing TIM within the PCB structure, allowing for efficient heat transfer

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentEP4676170A1Printed circuit board structure accommodating thermal interface material, and electronic device comprising same

Publication Date: 2026.01.07 SAMSUNG ELECTRONICS CO LTD

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AI summary

According to an embodiment, a printed circuit board (PCB) structure may include: a first PCB; an interposer; a second PCB; and a cover structure including a mounting layer which is connected to the second PCB and includes a base hole, a support layer which is on a surface of the mounting layer that faces away from the second PCB, and a visible layer which is connected to the support layer and includes a material having transparency.