Hole-In Display Electrode Layout for Lateral Moisture Blocking
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Solution Overview
Problem
The challenge is to prevent or reduce lateral moisture penetration and micro cracks in display devices, particularly in hole-in display (HID) or hole-in active area (HiAA) designs, where the substrate is partially removed, leading to potential deterioration of display quality.
Innovation Solution
A display device is designed with a light emitting stack that is patterned to block lateral moisture penetration paths. This is achieved by forming a substrate with a non-display area containing a through-hole and a display area surrounding it, along with an insulating layer, a light emitting stack, a second electrode, and an electrode patterning material layer. Additionally, a dam structure is disposed between the display area and the through-hole to further prevent moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through-hole is formed in the non-display area to enable hole-in display design, then the display flexibility and modern design are improved, but moisture penetration paths are created that lead to display quality deterioration
Solution Approach 1:
The light emitting stack is divided into multiple segments with different heights, creating a stepped structure. The first light emitting stack has a first height and the second light emitting stack has a second height higher than the first height, forming distinct segments that collectively block moisture penetration paths while maintaining the through-hole design for display flexibility.
Solution Approach 2:
The solution transitions from a single-layer blocking approach to a multi-level vertical structure. By creating light emitting stacks with different heights in the vertical dimension, the patent establishes multiple blocking levels that prevent moisture from reaching the display area through the through-hole, thus addressing moisture penetration while preserving design flexibility.
2Adaptability or versatility
If the substrate is removed in the display area to create hole-in display, then functional flexibility is improved, but cracks and moisture penetration occur causing reliability deterioration
Solution Approach 1:
The patent implements protective structures (light emitting stacks with different heights and insulating layers) before moisture penetration can occur. These structures are预先 designed to block potential moisture paths and prevent cracks from propagating, thereby cushioning against future reliability issues while maintaining the hole-in display configuration.
Solution Approach 2:
The patent employs composite structures combining light emitting stacks with different heights, insulating layers, and electrode patterning material layers. This composite approach creates a robust multi-layer system that simultaneously provides mechanical support to prevent cracks and moisture blocking, thereby enhancing reliability while preserving functional flexibility.
3Object-affected harmful factors
If the light emitting stack is extended to block moisture, then moisture penetration is reduced, but device complexity increases
Solution Approach 1:
The light emitting stacks with different heights serve multiple functions: they block moisture penetration paths, provide structural support, and maintain the hole-in display aesthetic. By making these structures multi-functional, the patent reduces the need for additional separate components, thereby managing device complexity while effectively preventing moisture penetration.
Solution Approach 2:
The patent merges the moisture blocking function with the light emitting structure itself. Instead of adding separate moisture barrier layers, the light emitting stacks are designed with varying heights to inherently block moisture paths, combining structural and protective functions into a single integrated system that reduces overall device complexity.
4Object-affected harmful factors
If additional dam structures are added to prevent moisture, then moisture penetration is blocked, but manufacturing complexity increases
Solution Approach 1:
The dam structures and light emitting stacks are designed and positioned in advance during the manufacturing process to pre-establish moisture blocking paths. By performing these protective arrangements preliminarily, the patent simplifies subsequent manufacturing steps and avoids the need for complex post-processing or additional moisture barrier applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents or reduces lateral moisture penetration and micro cracks, thereby enhancing the display quality and lifespan of the device, which in turn leads to low power consumption.
Implementation Method 1
forming a groove by irradiating laser light to the sacrificial layer
Data Source
AI summary
Discussed is a display device that includes a substrate having a non-display area having a through-hole and a display area adjacent to the non-display area, an insulating layer disposed on the substrate, a light emitting stack disposed on the insulating layer, an electrode extending from the display area to the non-display area and disposed on the light emitting stack, and an electrode patterning material layer contacting one end of the electrode, and disposed on the light emitting stack. One end of the light emitting stack and one end of the electrode patterning material layer can coincide. It is possible to provide a display device capable of preventing or reducing lateral moisture penetration due to a presence of the light emitting stack.