Rollable Display Driver IC Shock Absorption

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Solution Overview

Problem

Rollable display devices face challenges in minimizing damage to the driver IC during winding and unwinding due to vibrations and impacts, as well as deformation and separation of the display panel from the back cover, which can lead to mechanical stress and potential detachment.

Innovation Solution

A display device design that includes a flexible film and printed circuit board secured between a base plate and a top cover with a curved surface, along with a back cover having a fixing area with multiple holes for fixing the components, to absorb shocks and maintain panel integrity during rolling and unrolling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display device is made flexible and rollable, then the device can be wound or unwound for compact storage, but the driver IC may be damaged due to vibrations and impacts during winding

Engineering Contradiction:

Improverollable display capabilityVSAvoiddriver IC protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by placing a cushioning layer between the back cover and the driver IC before the damage can occur. This cushioning layer absorbs vibrations and impacts during the winding process, protecting the driver IC from damage while maintaining the rollable display's flexibility and adaptability.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Adaptability or versatility

If the display device is made flexible and rollable, then the device can be wound or unwound for compact storage, but the display panel may deform during winding and unw winding

Engineering Contradiction:

Improverollable display capabilityVSAvoiddisplay panel shape stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent employs flexible shells and thin films by using a back cover with a specific curvature radius that matches the winding radius. This allows the display panel to bend smoothly during rolling without deforming, while the cushioning layer provides additional support to maintain panel stability during the winding and unwinding cycles.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If the display device is made flexible and rollable, then the device can be wound or unwound for compact storage, but the display panel may separate from the back cover during winding

Engineering Contradiction:

Improverollable display capabilityVSAvoidpanel-to-back cover bonding

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The cushioning layer is positioned between the back cover and the display panel to prevent separation during winding. By providing continuous support and absorbing mechanical stresses, the cushioning layer maintains the bonding strength between the panel and back cover, preventing delamination while enabling the rollable function.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Reliability

If a rigid structure is used to protect the driver IC, then the driver IC is protected from damage, but the display device cannot be rolled or folded

Engineering Contradiction:

Improvedriver IC protectionVSAvoidrollable display capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses a flexible cushioning layer instead of a rigid protective structure. This flexible layer can be compressed and bent during rolling, providing driver IC protection while maintaining the device's rollability. The cushioning layer's flexibility allows it to conform to the curved shape during winding, unlike rigid structures that would prevent rolling.

Inventive Principle:

Principle #30Flexible shells and thin films

5Adaptability or versatility

If the back cover is made completely flexible, then the device can be rolled easily, but the driver IC becomes more vulnerable to damage from vibrations

Engineering Contradiction:

Improverollable display capabilityVSAvoiddriver IC protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a cushioning layer specifically designed to absorb vibrations and impacts while allowing the back cover to remain flexible. This layer provides the necessary protection for the driver IC during rolling operations, balancing the flexibility needed for easy rolling with the protection required to prevent damage from vibrations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11087648B2Display device

Publication Date: 2021.08.10 LG DISPLAY CO LTD

AI summary

A disclosed display device may include a display panel including a plurality of sub-pixels, and a back cover configured to support the display panel and configured be wound or unwound along with the display panel. The display device may further include a base plate on a first surface of the back cover to support the back cover and a top cover on a second surface of the back cover opposite the first surface so that the back cover is between the base plate and the top cover. The top cover may be fixed to the back cover. The top cover may have a curved outer peripheral surface.