Micro LED Connection Electrode Layout for Tilt-Tolerant Displays
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Solution Overview
Problem
During the manufacturing of ultra-small light-emitting displays, micro light-emitting elements often tilt or fall, leading to electrical disconnection from the pixel electrode, resulting in failed light emission.
Innovation Solution
A display device design that includes a substrate, a pixel electrode, an organic layer, a light-emitting element, and connection electrodes. The connection electrodes are strategically placed on the side surfaces of the organic and contact electrodes to ensure electrical connectivity, even if the light-emitting element tilts or falls slightly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro light-emitting elements are bonded to pixel electrodes, then light emission function is achieved, but electrical disconnection occurs due to tilting or falling
Solution Approach 1:
The connection electrode extends along the side surface of the organic layer, transitioning from a planar two-dimensional connection to a three-dimensional structure that wraps around the light-emitting element. This spatial extension in the vertical dimension ensures continuous electrical contact even when the element tilts or falls, resolving the contradiction between connection reliability and structural simplicity.
Solution Approach 2:
The connection electrode acts as an intermediary component between the pixel electrode and the contact electrode of the light-emitting element. By introducing this intermediate conductive structure that follows the side surface of the organic layer, it mediates the electrical connection and maintains reliability despite positional deviations or tilting of the light-emitting element.
2Reliability
If connection electrodes are placed on side surfaces, then electrical connectivity is maintained during tilting, but manufacturing precision requirements increase
Solution Approach 1:
The connection electrode is designed to extend along the side surface of the organic layer before the light-emitting element is fully positioned or bonded. This preliminary extension creates a pre-positioned conductive path that anticipates potential tilting or falling, ensuring electrical connectivity is established in advance and maintains stability without requiring ultra-precise final positioning.
3Productivity
If micro light-emitting elements are used, then ultra-small display is achieved, but bonding failure occurs leading to non-emission
Solution Approach 1:
By extending the connection electrode along the side surface of the organic layer rather than relying solely on planar bonding, the electrical connection is maintained through a three-dimensional path. This dimensional transition compensates for bonding failures caused by tilting or falling, ensuring that miniaturized light-emitting elements remain reliably connected despite their small size and vulnerability to bonding issues.
Data Source
AI summary
Provided are a display device and a method for manufacturing the same. According to one or more embodiments of the present disclosure, the display device includes a substrate, a pixel electrode above the substrate, an organic layer above the pixel electrode, a light-emitting element above the organic layer, and including a contact electrode in contact with the organic layer, and a connection electrode connected to the pixel electrode and to the contact electrode, on a side surface of the organic layer, and on a side surface of the contact electrode.