Flexible Display Adhesive Layer Thickness for Foreign Matter Trapping
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Solution Overview
Problem
Flexible displays face damage from foreign matters adhering to the substrate during protection film attachment, leading to potential circuit breakage due to protrusions of the flexible substrate.
Innovation Solution
A flexible display design with a first adhesive layer of thickness greater than or equal to 30 μm is used between the protection film and the flexible substrate, effectively trapping foreign matters and preventing them from pressing against the substrate, thus preventing damage to the array circuit layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection film is attached to the flexible substrate using a thin adhesive layer, then the display structure remains compact and flexible, but foreign matters can press against the substrate causing protrusions that damage TFT elements
Solution Approach 1:
The patent changes the parameter of adhesive layer thickness from conventional thin dimensions to at least 30 micrometers. This parameter change creates sufficient space to accommodate foreign matters (particles up to 30 μm) within the adhesive layer, preventing them from pressing against the flexible substrate and causing protrusions that would damage TFT elements.
Solution Approach 2:
The thick adhesive layer acts as an intermediary buffer zone between the protection film and the flexible substrate. It absorbs and isolates foreign matters that may be present between these two components, preventing direct contact and pressure transmission to the substrate and underlying TFT elements.
2Reliability
If the adhesive layer thickness is increased to at least 30 μm to accommodate foreign matters, then foreign matters are effectively contained, but the overall display thickness increases
Solution Approach 1:
The patent accepts the parameter change in adhesive layer thickness (to at least 30 μm) as a necessary trade-off to achieve the primary goal of preventing TFT element damage. The increased thickness provides the required accommodation space for foreign matters while maintaining the overall functionality and flexibility of the display.
3Reliability
If a protection film is attached to protect the flexible substrate, then the substrate is protected from external forces, but foreign matters adhering to the substrate cause protrusions that damage TFT elements
Solution Approach 1:
The thick adhesive layer serves as an intermediary buffer that decouples the protection film from the flexible substrate. This intermediary space captures and contains foreign matters that adhere to the substrate, preventing them from creating protrusions that would compromise the protective function or damage underlying components.
Solution Approach 2:
By changing the adhesive layer thickness parameter to at least 30 μm, the patent creates sufficient accommodation space for foreign matters, transforming the adhesive layer from a simple bonding medium into a protective buffer zone that neutralizes the harmful effects of foreign matter adhesion.
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 increased adhesive layer thickness effectively prevents foreign matters from causing protrusions and subsequent damage to the array circuit layer, maintaining the integrity of the flexible display's circuitry during protection film attachment.
Implementation Method 1
a first adhesive layer is disposed between the first protection film and the flexible substrate, and the first adhesive layer has a thickness substantially greater than or equal to 30 μm
Data Source
AI summary
A flexible display including a flexible substrate, an array circuit layer, a protection film, and an adhesive layer is provided. The flexible substrate has a first surface and a second surface, disposed opposite to each other. The array circuit layer is disposed on the second surface of the flexible substrate. The protection film is disposed on the first surface of the flexible substrate. The adhesive layer is disposed between the protection film and the flexible substrate, and has a thickness, substantially greater than or equal to 30 micrometers.