OLED Substrate Groove Enhances Encapsulation Adhesion
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Solution Overview
Problem
Display devices, particularly organic light emitting diode (OLED) displays, face performance deterioration due to moisture and air exposure, leading to encapsulation layer peeling in the peripheral areas, which is exacerbated by the need for a wider bezel to prevent peeling, contradicting the demand for bezel-less designs.
Innovation Solution
Incorporating a groove in the edge area of the substrate's non-display region to increase the contact area and contact force between the substrate and the encapsulation layer, using a combination of inorganic and organic encapsulation layers, with the groove formed in at least one of the insulating films, to prevent peeling without widening the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the non-display area is increased to prevent encapsulation layer peeling, then the contact area between the substrate and encapsulation layer is increased, but the bezel width increases which contradicts the demand for bezel-less design
Solution Approach 1:
The patent applies local quality by creating a groove structure specifically in the edge area of the non-display area where the encapsulation layer is prone to peeling. This localized structural modification increases contact area and adhesion strength precisely where needed, rather than uniformly increasing the entire non-display area width. The groove concentrates the adhesion enhancement in the critical peripheral region while maintaining a narrow overall bezel width.
Solution Approach 2:
The patent transitions from a two-dimensional solution (increasing the width of the non-display area) to a three-dimensional solution (creating a groove with depth and volume). The groove structure adds a vertical dimension to the substrate surface, increasing the contact area between the substrate and encapsulation layer without expanding the horizontal footprint, thus maintaining a narrow bezel width while improving adhesion.
2Area of stationary object
If the width of the non-display area is increased to increase contact area, then encapsulation layer peeling is prevented, but the display device size increases
Solution Approach 1:
The patent utilizes the third dimension (depth) by forming a groove in the substrate. This vertical structure increases the contact area between the substrate and encapsulation layer without requiring an increase in the horizontal area of the display device. The groove's volume provides additional adhesion area while maintaining a compact overall device footprint.
Solution Approach 2:
The groove structure concentrates the contact area enhancement in the specific edge region where peeling occurs, rather than uniformly expanding the entire non-display area. This localized approach increases the effective contact area for adhesion without proportionally increasing the total device area, thus improving adhesion efficiency.
3Force
If a groove is formed in the substrate edge area, then contact force between substrate and encapsulation layer is increased, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the substrate's geometric parameters by introducing a groove with specific dimensions (depth, width, shape) in the edge area. This parameter change creates additional contact force and adhesion area without fundamentally altering the substrate's overall structure or material composition, thereby limiting the increase in manufacturing complexity to a controlled geometric modification.
Data Source
AI summary
A display device includes: a substrate having a display area and a non-display area disposed around the display area; an organic light emitting diode disposed on the substrate in the display area; and a spacer disposed on the substrate in the non-display area, the substrate includes a first insulating film and a second insulating film disposed on the first insulating film, the substrate includes a groove disposed in an edge area farther from the organic light emitting diode than the spacer in the non-display area, and the groove is formed in at least one of the first insulating film and the second insulating film.