Light-Emitting Element Alignment Using Ink and Electrodes
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Solution Overview
Problem
Existing methods for fabricating display devices face challenges in accurately aligning light-emitting elements, leading to inefficiencies and reduced yield.
Innovation Solution
A method involving the preparation of a target substrate, application of ink, and alignment of light-emitting elements using alignment electrodes, where the elements are separated from a semiconductor substrate and aligned on the target substrate using a cutting unit or laser beam, followed by application of alignment signals to achieve precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fabrication methods are used, then the fabrication process can be completed, but the alignment of light-emitting elements is inaccurate
Solution Approach 1:
The patent applies preliminary action by first applying ink to the target substrate before supplying the light-emitting elements. This sequence allows the ink to be in place to receive and hold the elements, enabling accurate alignment when the elements are supplied to the ink. The ink acts as a receiving medium that facilitates precise positioning, resolving the contradiction between alignment precision and fabrication efficiency.
2Manufacturing precision
If light-emitting elements are supplied directly without ink, then the process is simpler, but alignment accuracy deteriorates
Solution Approach 1:
The patent introduces ink as an intermediary substance between the target substrate and the light-emitting elements. The ink serves as a mediator that receives the light-emitting elements and enables accurate alignment. This intermediary approach improves alignment precision while adding only a simple coating step, avoiding significant increases in process complexity.
3Manufacturing precision
If alignment is performed after element placement, then the process flow is simpler, but alignment accuracy is reduced
Solution Approach 1:
The patent performs preliminary action by applying the ink before supplying the light-emitting elements. This preliminary preparation of the receiving medium (ink) enables alignment to occur during the element supply process itself, rather than requiring separate post-placement alignment steps. This resolves the contradiction by achieving accurate alignment while maintaining an efficient process flow.
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
Improves the alignment of light-emitting elements, enhancing their utilization efficiency and increasing the yield of the display device fabrication process.
Implementation Method 1
the separating of the light-emitting elements from the semiconductor substrate may include irradiating the light-emitting element substrate with a laser beam to separate the light-emitting elements from the semiconductor substrate
Implementation Method 2
the aligning of the light-emitting elements on the target substrate may include applying an alignment signal to the alignment electrodes to align the light-emitting elements between the alignment electrodes
Data Source
AI summary
A method of fabricating a display device includes preparing a target substrate and light-emitting elements, applying ink on the target substrate, supplying the light-emitting elements to the ink, and aligning the light-emitting elements to aligned positions on the target substrate. Accordingly, the alignment of the light-emitting elements is improved and the utilization efficiency of the light-emitting elements is increased.