Flexible Display Battery Heat Dissipation Sheet for Hot Spot Control

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Solution Overview

Problem

Flexible display devices face challenges in achieving overall flexibility due to heat generation and potential 'hot spots' from energy storage devices, which can damage the panel and pose safety risks.

Innovation Solution

A flexible display device design incorporating a flexible display panel, a flexible battery, and a heat dissipation assembly with a bendable heat dissipation sheet that includes patterned opening holes, heat dissipation bars, and a heat dissipation pipe to absorb and distribute heat evenly, preventing temperature extremes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If a flexible battery is used to power the flexible display device, then the device achieves overall flexibility and thinner profile, but heat generation and hot spots occur during charging and discharging

Engineering Contradiction:

Improveflexibility durationVSAvoidbattery temperature

Core Design Contradiction:

Duration of action of moving objectVSTemperature

Solution Approach 1:

A heat dissipation sheet is introduced as an intermediary component between the flexible battery and the flexible display panel. This heat dissipation sheet includes a heat dissipation layer with high thermal conductivity to conduct heat away from the battery, and a gel layer that provides both thermal management and flexibility. This intermediary structure enables the device to maintain flexibility while actively managing the temperature rise during battery operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical and chemical parameters of the heat dissipation materials to optimize thermal management. The heat dissipation layer uses materials with specific thermal conductivity parameters, and the gel layer is formulated with specific viscosity and thermal conductivity values. By adjusting these parameters, the system achieves effective heat dissipation while maintaining the flexible characteristics needed for the overall device design.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If local high heat concentration occurs in the battery, then the device structure remains simple, but the display panel is damaged and safety risks increase

Engineering Contradiction:

Improveheat dissipation structure complexityVSAvoidhot spot damage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The heat dissipation sheet is designed with spatially varying properties to address local heat concentration issues. The gel layer has different formulations in different regions, with higher thermal conductivity areas positioned over the battery's high heat generation zones. This local quality variation allows the structure to remain relatively simple overall while providing targeted heat dissipation where it is most needed to prevent hot spot damage to the display panel.

Inventive Principle:

Principle #3Local quality

3Temperature

If a rigid heat dissipation structure is used, then heat dissipation efficiency is high, but the overall flexibility of the display device is compromised

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoiddevice flexibility

Core Design Contradiction:

TemperatureVSShape

Solution Approach 1:

The patent replaces rigid heat dissipation structures with flexible thin film and gel-based heat dissipation sheets. The heat dissipation layer is made as a thin flexible film that can conform to the bending of the device, while the gel layer provides both flexibility and thermal management. This approach maintains heat dissipation efficiency through the high thermal conductivity materials while allowing the entire display device to achieve the desired flexible form factor without structural compromise.

Inventive Principle:

Principle #30Flexible shells and thin films

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 ensures uniform heat distribution across the flexible battery, preventing adverse effects on the display panel and enhancing safety by maintaining optimal temperatures during charging and discharging.

Implementation Method 1

a heat dissipation assembly including a first heat dissipation sheet, the first heat dissipation sheet being arranged at a side of the flexible battery facing or away from the flexible display panel

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a bendable area, wherein the bendable area of the first heat dissipation sheet has a through structure in a thickness direction

Methodology Applied

Scientific EffectHeat absorption: Absorption (physical)

Data Source

PatentUS12015133B2Flexible display device

Publication Date: 2024.06.18 BOE TECHNOLOGY GROUP CO LTD

AI summary

A flexible display device is described, including: a flexible display panel; a flexible battery arranged at a side of the flexible display panel away from a light emitting surface; and a heat dissipation assembly including a first heat dissipation sheet, the first heat dissipation sheet being arranged at a side of the flexible battery facing or away from the flexible display panel, and the first heat dissipation sheet having a bendable area.