Display Electrode Coating for Precise Light-Emitting Element Placement
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Solution Overview
Problem
Existing methods for manufacturing display devices face challenges in precisely arranging light emitting elements between electrodes, leading to inefficiencies and increased defects due to spreading of the ink containing light emitting elements.
Innovation Solution
A method involving the formation of a coating layer with a hydrophobic material on the electrodes, which prevents the ink containing light emitting elements from spreading, allowing for precise placement of the elements between the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional method without coating layer is used to place light emitting elements, then the manufacturing process is simpler, but the ink containing light emitting elements spreads and positioning precision deteriorates
Solution Approach 1:
A coating layer is introduced as an intermediary between the substrate and the ink containing light emitting elements. This coating layer serves as a mediator that controls the spreading of the ink and enables precise positioning of the light emitting elements, resolving the contradiction between positioning precision and process simplicity.
Solution Approach 2:
The coating layer is formed in advance before the ink is applied. This preliminary action prepares the surface with controlled wettability characteristics, ensuring that when the ink is subsequently applied, it will not spread uncontrollably and will maintain precise positioning of the light emitting elements.
2Productivity
If the ink containing light emitting elements is applied without a coating layer, then the application process is faster, but the ink spreads and manufacturing efficiency deteriorates
Solution Approach 1:
The coating layer acts as an intermediary that prevents uncontrolled spreading of the ink while still allowing for efficient application. By controlling the wettability of the surface, it enables the ink to be applied quickly without sacrificing alignment accuracy, thus resolving the contradiction between productivity and manufacturing precision.
3Manufacturing precision
If no coating layer is used, then the device structure is simpler, but light emitting elements cannot be accurately positioned between electrodes
Solution Approach 1:
The coating layer serves as a mediator between the electrodes and the light emitting elements, providing a controlled interface that enables accurate positioning. This single additional layer achieves the alignment function without requiring complex multi-layer structures or additional positioning mechanisms, resolving the contradiction between manufacturing precision and device complexity.
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 approach enhances the yield and reliability of light emission for each pixel by ensuring accurate alignment and positioning of light emitting elements, thereby reducing defects and improving manufacturing efficiency.
Implementation Method 1
a coating layer which includes a material having a polarity opposite to a polarity of an ink, and thus prevents the ink from spreading
Data Source
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AI summary
A display device and a manufacturing method thereof are provided. The display device comprises: a substrate in which a first region and a second region that is a region other than the first area, are defined; a first electrode and a second electrode that are at least partially spaced apart from each other in the first area on the substrate; a coating layer disposed on the substrate so as to cover at least a portion of the first electrode and the second electrode; and at least one light-emitting element disposed between the first electrode and the second electrode in the first region, wherein the coating layer comprises: an opening exposing at least portion of the first electrode and the second electrode in the first region, wherein the coating layer comprises: an opening exposing at least portion of the first electrode and the second electrode; and a first coating layer disposed in a region other than the opening and including a material having a first polarity.