Roller With Cut-Off Grooves For Rollable Display Panel

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Solution Overview

Problem

Rollable display devices face pixel defects due to stress damage when the display panel is rolled on a roller, leading to curvature-related issues.

Innovation Solution

A display device with a roller featuring a single-body rolling member having cut-off grooves on its outer surface and internal support members to minimize stress on the display panel, along with a cushion layer to reduce friction, ensuring the panel rolls on the outer surface without protrusions or recesses that could cause damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the display panel is rolled on a conventional roller, then the display device achieves portability and compact storage, but stress damage occurs in partial areas of the display panel causing pixel defects

Engineering Contradiction:

ImproveportabilityVSAvoidpixel defect prevention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The roller applies different local properties to different areas: the outer circumferential surface provides a smooth rolling surface, while the inner circumferential surface includes support members at specific locations to provide localized support where stress concentrates during rolling, preventing pixel defects in those critical areas

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Support members are pre-installed inside the rolling member at positions that will experience stress during rolling. These support members act as beforehand cushioning elements that prevent stress concentration and potential pixel damage before it occurs during the rolling operation

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If support members are added inside the rolling member to prevent stress damage, then pixel defect prevention is improved, but the device complexity increases

Engineering Contradiction:

Improvepixel defect preventionVSAvoidroller structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The support members are nested inside the rolling member, with the support members fitting within the hollow interior space of the rolling member. This nested configuration allows the support function to be integrated within the existing roller structure without adding external complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The support members are integrated with the rolling member as a unified assembly. The support members combine with the rolling member's outer surface to form a complete roller system that provides both rolling function and stress prevention, merging multiple functions into a single integrated component

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12262488B2Display device and fabrication method of display device

Publication Date: 2025.03.25 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel that displays an image and a roller connected to an end of the display panel. The roller includes a rolling member having a single body, the rolling member including a cut-off groove formed on at least a portion of an outer circumferential surface of the rolling member, and at least one support member disposed in an internal empty space of the rolling member.