Flexible Display Clamp Unit for Thin Film Adhesion
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Solution Overview
Problem
Flexible display devices face separation issues between thin film layers due to stress, such as folding or bending, which reduces the adhesion strength between these layers, particularly in organic light-emitting diode (OLED) technology.
Innovation Solution
A flexible display apparatus with a clamp unit structure that enhances adhesion between upper and lower thin film layers by incorporating an inverse tapered clamp unit in a non-organic layer region, which is buried by a capping layer, and formed using atomic layer deposition to connect the pixel defining layer and capping layer, thereby increasing the adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional spacer designs are used to maintain distance between layers, then device structure is simple, but adhesion strength between thin film layers is insufficient under stress
Solution Approach 1:
The clamp unit is divided into multiple segments (first clamp unit, second clamp unit, third clamp unit) that are distributed at different positions (corner, middle of first side, middle of second side) around the subpixel. This segmentation allows the adhesion reinforcement function to be distributed throughout the structure, providing comprehensive stress resistance without requiring a single complex monolithic component.
Solution Approach 2:
The clamp unit extends in multiple spatial dimensions - vertically (thickness direction) to bridge the gap between pixel defining layer and capping layer, and horizontally (planar directions) to reach multiple sides of the subpixel. This multi-dimensional configuration transforms a simple 2D spacer into a 3D anchoring structure that provides superior mechanical interlocking and adhesion reinforcement.
2Adaptability or versatility
If thin film layers are made thinner to achieve flexibility, then device flexibility is improved, but separation between layers occurs under stress
Solution Approach 1:
The clamp unit is formed in advance during the manufacturing process, before the device is subjected to flexing or bending stresses. This preliminary formation of the adhesion-reinforcing structure ensures that the mechanical interlocking is already in place to prevent separation when flexibility is later exploited during device operation.
Solution Approach 2:
The clamp unit is formed using a material that is substantially the same as the pixel defining layer, creating a composite structure where the clamp unit and pixel defining layer work together as an integrated system. This material compatibility ensures coordinated mechanical properties that maintain adhesion under flexing conditions.
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 clamp unit structure effectively prevents or reduces separation of thin film layers under stress, improving the reliability and durability of flexible display devices by enhancing adhesion strength by approximately 50% compared to traditional spacer designs.
Implementation Method 1
The capping layer may be formed by atomic layer deposition
Data Source
AI summary
A flexible display apparatus and a method of manufacturing the flexible display apparatus are disclosed. A flexible organic light-emitting display apparatus includes: a thin film transistor formed on a substrate in which a plurality of subpixels are located; an organic light-emitting device electrically connected to the thin film transistor and in one of the subpixels, the organic light-emitting device including a first electrode, an organic layer on the first electrode; and a second electrode on the organic layer; a pixel defining layer having an opening that exposes at least a region of the first electrode, and covering an edge region of the first electrode; a capping layer covering the organic light-emitting device; and at least one clamp unit in a non-organic layer region defined next to the one of the subpixels, wherein the non-organic layer region is a region in which the organic layer is not formed.