Display Substrate Crack Prevention Structure for Camera Holes
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Solution Overview
Problem
In bezel-less or bezel-free display designs, the formation of holes in the display panel for cameras and sensors can lead to optical interference and moisture penetration, causing degradation in display quality due to cracks generated during the cutting process for removing the substrate.
Innovation Solution
A display apparatus with a substrate featuring a camera hole and a non-display area, where a light-emitting element is positioned, and a crack prevention structure is disposed between the dam and the camera hole, comprising multiple insulating films and cut-out parts to prevent crack propagation and moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hole is formed in the display panel for camera and sensor placement, then bezel-less design is achieved, but optical interference occurs and display quality degrades
Solution Approach 1:
A fill material is introduced as an intermediary substance to fill the hole formed in the display panel. This fill material serves as a mediator that prevents optical interference while allowing the hole to exist for camera and sensor placement, thus resolving the contradiction between achieving bezel-less design and preventing optical interference
Solution Approach 2:
The hole that causes optical interference is converted into a beneficial structure by filling it with a material that has appropriate optical properties. The previously harmful void is transformed into a useful component that maintains structural integrity while preventing light leakage and interference
2Ease of manufacture
If laser cutting is used to remove substrate in hole area, then hole formation is achieved, but cracks are generated in substrate and insulating films
Solution Approach 1:
The hole area is designed with predetermined boundaries and the fill material is applied in advance to cushion and support the surrounding substrate and insulating films. This prior cushioning prevents stress concentration and crack propagation that would otherwise occur during laser cutting and subsequent processing
Solution Approach 2:
The insulating films are selectively removed only in the immediate vicinity of the hole, while the fill material is applied locally to the hole area. This localized treatment maintains manufacturing efficiency while preventing cracks from propagating to the display area
3Adaptability or versatility
If substrate is removed from hole area, then camera and sensor placement is enabled, but moisture penetration paths are created
Solution Approach 1:
A fill material with moisture-blocking properties is introduced as an intermediary substance to fill the hole in the substrate. This material acts as a barrier that prevents moisture from penetrating through the hole area to the organic light-emitting stack, while still allowing camera and sensor components to be placed in the hole
Solution Approach 2:
The substrate is selectively removed only in the hole area where cameras and sensors need to be placed, while the surrounding substrate and insulating films are preserved. This extraction creates the necessary space for component placement while the fill material compensates for the removed substrate's protective function
4Strength
If cracks propagate from cut portion to display area, then structural integrity is compromised, but organic light-emitting elements become vulnerable to moisture
Solution Approach 1:
The hole area is filled with a moisture-blocking material in advance, creating a protective barrier before moisture can penetrate through potential crack paths. This prior cushioning ensures that even if cracks form in the substrate or insulating films, moisture cannot reach the organic light-emitting elements
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 crack propagation and moisture penetration, maintaining display quality by creating a barrier that blocks oxygen and moisture, ensuring the organic light-emitting stack remains intact and preventing pixel shrinkage or dark spots.
Implementation Method 1
When cutting is performed based on a phenomenon in which the substrate of the display panel is melted and broken by local thermal energy received from the laser
Implementation Method 2
local thermal energy received from the laser
Implementation Method 3
Cracks generated in the cut portion of the substrate may become a kind of moisture penetration path
Data Source
AI summary
A display apparatus includes a substrate including a display area, a camera hole, and a non-display area between the display area and the camera hole, a light-emitting element disposed in the display area, one or more cut-out parts and at least one dam disposed in the non-display area, a plurality of insulating films disposed on the substrate and disposed under the light-emitting element, the cut-out parts, and the dam, and a crack prevention structure disposed between the at least one dam and the camera hole.