Display Electrode Alignment of Light-Emitting Elements With AC Fields
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Solution Overview
Problem
In the manufacturing process of display devices, aligning light emitting elements between electrodes on a substrate is crucial to ensure proper light emission, as elements aligned in the reverse direction may not emit light.
Innovation Solution
A method involving the use of a first ink and a second ink, where the second ink contains light emitting elements, is applied on a substrate with electrodes. An AC voltage is applied to the electrodes to align the light emitting elements, utilizing positive dielectrophoresis to enhance their deflection factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are arranged between electrodes without alignment control, then the manufacturing process is simple, but the light emitting elements may be arranged in reverse direction and not emit light
Solution Approach 1:
The patent replaces mechanical alignment methods with an electric field-based alignment system. By applying AC voltage to electrodes, light emitting elements are aligned through dielectrophoresis and electrophoresis effects, eliminating the need for complex mechanical positioning structures while ensuring proper orientation for light emission
Solution Approach 2:
The patent utilizes changes in electrical parameters (AC voltage frequency, amplitude, and waveform) to control the alignment of light emitting elements. By adjusting these parameters, the alignment precision and deflection factor can be optimized without adding mechanical complexity to the system
2Manufacturing precision
If AC voltage is applied to align light emitting elements, then the alignment precision and deflection factor are improved, but the manufacturing process complexity increases
Solution Approach 1:
The electrode structure serves multiple functions: it acts as both the electrical connection element for light emission and the alignment field generator. By applying AC voltage to these existing electrodes, the system achieves alignment without requiring separate alignment electrodes or additional structural components
Solution Approach 2:
The patent employs periodic AC voltage application to achieve effective alignment. The alternating voltage creates time-varying electric fields that generate dielectrophoretic forces, causing light emitting elements to oscillate and align with the electric field direction. This periodic action enhances alignment precision while using standard electrode structures
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 method effectively aligns light emitting elements in the same direction, increasing their deflection factor and ensuring that they emit light properly, thereby improving the performance of display devices.
Implementation Method 1
The AC voltage may form a positive dielectrophoresis
Implementation Method 2
Each of the light emitting elements may include a first conductivity type semiconductor and a second conductivity type semiconductor. The first conductivity type semiconductor of each of the light emitting elements may face in a first electrode direction by applying the AC voltage. The second conductivity type semiconductor of each of the light emitting elements may face in a second electrode direction by applying the AC voltage
Data Source
AI summary
In a method of aligning a light emitting element, the method includes providing a first ink on a substrate on which a first electrode and a second electrode spaced apart from the first electrode are provided, providing a second ink including light emitting elements on the first ink, and applying an AC voltage to the first electrode and the second electrode.