Bendable Display Pad Layout With Grooved Wire Isolation

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Solution Overview

Problem

Display devices face challenges with increased damage and short-circuit probability due to modulus differences between stacked insulation layers when bent, and existing designs struggle to minimize the pad area while maintaining performance.

Innovation Solution

A display device with a substrate featuring a display area and a pad area that includes a bending groove with a cutoff portion between peripheral wires, formed from the same material as the insulating layer, which reduces the likelihood of damage and short circuits by minimizing material residue in the groove.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the pad area is reduced to increase display area, then the display area ratio is improved, but the risk of short circuit between peripheral wires increases

Engineering Contradiction:
Improvedisplay areaVSAvoidshort circuit risk
Core Design Contradiction:
Area of stationary objectVSReliability

Solution Approach 1:

The insulating layer is segmented by forming bending grooves that divide it into multiple regions. These grooves create physical separations between adjacent peripheral wires, preventing direct contact and potential short circuits while allowing the pad area to be minimized.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The bending groove acts as an intermediary insulating structure between adjacent peripheral wires. By introducing this intermediate element, the patent ensures electrical isolation between wires that would otherwise be in close proximity due to the reduced pad area.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If insulation layers are stacked to provide electrical isolation, then the short circuit prevention is improved, but the modulus difference between layers causes damage during bending

Engineering Contradiction:
Improveelectrical isolationVSAvoidbending durability
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

Instead of using multiple stacked insulating layers throughout the entire structure, the patent applies insulating material locally only where needed - specifically in the bending grooves between peripheral wires. This localized approach provides electrical isolation where required while avoiding the bending damage issues associated with multiple stacked layers across the entire device.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent extracts the essential function of electrical isolation from the context of multiple stacked layers and implements it through a simplified single-layer structure with bending grooves. This removes the harmful modulus differences between multiple layers while preserving the necessary insulation function.

Inventive Principle:
Principle #2Taking out (Extraction)

3Reliability

If the insulating layer is continuous to provide uniform protection, then the electrical isolation is improved, but the material residue in bending areas causes damage during bending

Engineering Contradiction:
Improveelectrical isolationVSAvoiddamage during bending
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent removes the insulating material from the bending areas by forming grooves, extracting only the portions that would cause damage during bending. This leaves the insulating layer continuous in non-bending areas for electrical isolation while eliminating material residue in bending zones that would otherwise cause damage.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The continuous insulating layer is segmented by removing material in bending grooves, creating a discontinuous structure that is optimized for both electrical isolation and bending durability. The segmentation allows the insulator to maintain its protective function where needed while avoiding damage in bending regions.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS12191317B2Display device
Publication Date: 2025.01.07 SAMSUNG DISPLAY CO LTD
  • US12191317B2 patent drawing
  • US12191317B2 patent drawing
  • US12191317B2 patent drawing

AI summary

A display device is disclosed. In one aspect, the display device includes a substrate including a display area, the display area including a plurality of pixels configured to display an image and a pad area adjacent to the pad area and configured to transfer electrical signals. At least a portion of the pad area is bendable. The display device also includes an insulating layer formed over the substrate and including a bending groove in the pad area. The bending groove includes a sidewall. A plurality of peripheral wires is formed over the insulating layer, and a cutoff portion is connected to the sidewall and disposed between adjacent peripheral wires.