Micro LED Display Electrode Routing for Zero-Bezel Edge Protection
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Solution Overview
Problem
Conventional zero bezel technology for display devices faces challenges in implementing narrow bezel areas and preventing damage to substrates and electrodes, especially when exposed to external impacts, which limits the manufacturing of high-resolution, large-area displays.
Innovation Solution
A display device design featuring a first substrate with electrodes on both surfaces, a second substrate with exposure portions connecting to the first substrate's electrodes, and a connection electrode that contacts the exposed portions to connect the substrates efficiently, using a micro LED configuration to enable narrow bezel displays and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If zero bezel technology is implemented by printing wires on side surface or bending flexible substrate, then bezel area is reduced, but substrate and electrodes are damaged by external impact
Solution Approach 1:
The patent moves the connection wires from the side surface (2D plane) to the interior volume of the display device by forming them within the encapsulant layer. This three-dimensional routing allows the side surface to be fully sealed with glass substrates, eliminating exposure to external impacts while maintaining electrical connections through internal pathways.
Solution Approach 2:
The connection wires are embedded within the encapsulant layer, which is itself enclosed between the first and second glass substrates. This nested structure places the vulnerable wires inside a protective shell, shielding them from external damage while maintaining their electrical connection function.
2Area of stationary object
If flexible substrate is bent rearward to implement zero bezel, then bezel area is reduced, but internal electrode is damaged and resistance increases
Solution Approach 1:
Instead of bending the substrate in the lateral direction to reduce bezel, the patent routes connection wires through the vertical dimension within the encapsulant layer. This eliminates the need for substrate bending while maintaining internal wire protection and electrical connection integrity.
3Area of stationary object
If glass substrate is used with side surface processing for zero bezel, then bezel area is reduced, but glass is damaged by external impact
Solution Approach 1:
The patent eliminates side surface processing by routing all connections through the interior volume. This allows the glass substrates to maintain their full thickness and structural integrity without being thinned or processed at the edges, making them resistant to external impacts while achieving zero bezel appearance.
4Area of stationary object
If conventional zero bezel methods are used, then bezel area is reduced, but it is difficult to implement narrow pitch and high resolution
Solution Approach 1:
By routing connection wires through the encapsulant layer in three dimensions, the patent decouples the bezel width from the pixel pitch constraints. This allows independent optimization of both parameters, enabling narrow pitch high-resolution displays with true zero bezel without the geometric constraints that limited conventional approaches.
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
This configuration allows for the effective implementation of high-resolution, zero-bezel displays with improved reliability and reduced risk of substrate and electrode damage, enabling the production of large-area, high-resolution displays with efficient wiring.
Implementation Method 1
LED (light emitting diode), which is a well-known semiconductor light-emitting element that converts electric current into light
Data Source
AI summary
The present invention can be applied to a technical field regarding a display device, and relates to, for example, a display device using a micro light emitting diode (LED) and a modular display device using same. The display device of the present invention may comprise: a first substrate comprising a first electrode located on a first surface and a second electrode located on a second surface which is an opposite surface to the first surface; a second substrate located on the first substrate and comprising a connection wire that defines multiple individual pixel regions, the second substrate being located on the first substrate so as to have an exposure portion exposing at least a portion of the first electrode on the first substrate; a connection electrode which contacts the exposure portion through the side surface of the second substrate to connect the first electrode of the first substrate to the connection wire of the second substrate; and a light emitting device connected to the connection wire of the second substrate.