Planarization Layer Layout for Open-Area Display Quality

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Solution Overview

Problem

The removal of a portion of the substrate in the display area to accommodate electro-optical devices results in a widened bezel or notch, reducing the display area and causing display quality deterioration due to waviness around the open area.

Innovation Solution

A display device with a planarization layer positioned to overlap the display area and open area, enhancing display quality by mitigating waviness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If at least a portion of the substrate is removed in the display area to accommodate electro-optical devices, then the electro-optical device can be installed in the display area, but the display area is reduced and display quality deteriorates due to waviness around the open area

Engineering Contradiction:

Improveinstallation of electro-optical deviceVSAvoiddisplay quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

A planarization layer is introduced as an intermediary component between the open area (where substrate is removed) and the display area. This planarization layer fills the gap and provides a flat surface, eliminating the waviness that would otherwise occur at the boundary between the open area and the display area, thus maintaining display quality while allowing electro-optical device installation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The planarization layer is positioned specifically to overlap both the display area and the open area, providing localized surface correction where needed. This ensures that the display quality is maintained in the critical display region while the open area can accommodate electro-optical devices without compromising the overall surface flatness.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If at least a portion of the substrate is removed in the display area, then the bezel is widened or a notch is formed, but the display area is reduced

Engineering Contradiction:

Improveinstallation of electro-optical deviceVSAvoiddisplay area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The electro-optical device is nested within the display area by removing the substrate in that region, allowing the device to be integrated into the display panel structure. The planarization layer is then applied over this nested configuration to maintain surface flatness, enabling the electro-optical device to occupy space that would otherwise be part of the display area without requiring additional bezel width or notch formation.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS20250377782A1Display device

Publication Date: 2025.12.11 LG DISPLAY CO LTD

AI summary

Embodiments of the disclosure relate to a display device. Specifically, there is provided a display device with display quality enhanced by comprising a substrate, a display area where one or more subpixels are disposed, each of the one or more subpixels including a light emitting element positioned on the substrate and at least one transistor for driving the light emitting element, an open area obtained by removing at least a portion of the substrate in an area surrounded by the display area, and a planarization layer positioned to overlap the display area and the open area and positioned on the light emitting element.