Capacitor-Coupled Display Electrodes for Noise-Stable Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in efficiently aligning light emitting elements between alignment wires due to noise components in the applied voltage, leading to non-uniform alignment and reduced manufacturing efficiency.
Innovation Solution
The display device incorporates a capacitor structure with a first and second capacitor electrode, forming capacitors with the conductive lines and electrodes, to filter out alternating and direct current noise components, ensuring uniform alignment of light emitting elements by creating a stable electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage is applied to alignment wires to align light emitting elements, then alignment function is achieved, but noise components cause non-uniform alignment
Solution Approach 1:
A capacitor is introduced as an intermediary component between the voltage source and the alignment wire. The capacitor filters out noise components from the applied voltage, providing a clean voltage signal to the alignment wire. This mediator structure resolves the contradiction by blocking harmful noise while allowing the necessary alignment voltage to pass through.
Solution Approach 2:
The noise components are extracted and removed from the voltage signal using the capacitor's filtering function. By separating the useful voltage component from the harmful noise component, the alignment wire receives only the clean voltage needed for uniform alignment, eliminating the adverse effect of noise on alignment precision.
2Manufacturing precision
If capacitor is added to filter noise, then alignment uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The capacitor structure is merged with existing device components rather than being added as a completely separate element. The first capacitor electrode is combined with the alignment wire structure, and the insulating layer serves dual purposes as both capacitor dielectric and insulation layer. This integration reduces overall device complexity while maintaining the noise filtering function.
Solution Approach 2:
The insulating layer between the first capacitor electrode and second capacitor electrode serves multiple functions: it acts as the dielectric for the capacitor, provides electrical insulation, and structurally supports the alignment wire assembly. This multi-functionality reduces the need for additional components, thereby limiting the increase in 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 configuration improves alignment characteristics of light emitting elements, enhancing display quality and manufacturing efficiency by uniformly aligning the elements between alignment wires.
Implementation Method 1
a first capacitor electrode disposed on the conductive line and electrically connected to the conductive line; a passivation layer disposed on the first capacitor electrode; a first electrode disposed on the passivation layer and at least partially overlapping the first capacitor electrode in a plan view; a second electrode spaced apart from the first electrode, the second electrode and the first electrode being disposed on a same layer, and light emitting elements disposed between the first electrode and the second electrode
Data Source
AI summary
A display device and a manufacturing method of the display device are provided. A display device according to an embodiment includes a substrate, a conductive line disposed on the substrate, a first capacitor electrode disposed on the conductive line and connected to the conductive line, a passivation layer disposed on the first capacitor electrode, a first electrode disposed on the passivation layer and at least partially overlapping the first capacitor electrode, a second electrode spaced apart from the first electrode and formed on the same layer as the first electrode, and light emitting elements disposed between the first electrode and the second electrode.