Display Electrode Layout for LED Alignment Without Parasitic Fields
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Solution Overview
Problem
Display devices face issues with parasitic electric fields generated between electrodes and conductive layers during the fabrication process, which can affect the performance and reliability of the display.
Innovation Solution
The display device incorporates a design with a storage capacitor and specific electrode configurations that apply alignment voltages to suppress parasitic electric fields, including a first and second capacitor electrode that completely overlap light-emitting elements and partially overlap other electrodes, along with a method of aligning light-emitting elements to apply alignment voltages to these electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrodes are used to apply alignment signals during fabrication, then light-emitting elements can be properly aligned, but parasitic electric fields are generated between the electrodes and conductive layers underneath
Solution Approach 1:
An insulating layer is introduced between the alignment electrode and the underlying conductive layer to act as an intermediary that blocks parasitic electric field generation while allowing the alignment electrode to still apply alignment signals effectively
Solution Approach 2:
The harmful parasitic electric field effect is extracted and isolated by placing an insulating layer that specifically targets and eliminates the parasitic field pathway while preserving the desired alignment signal transmission
2Manufacturing precision
If the second capacitor electrode completely overlaps the light-emitting elements, then alignment precision is improved, but the device complexity increases
Solution Approach 1:
The second capacitor electrode is designed to serve multiple functions: it acts as both a storage capacitor electrode and an alignment electrode that applies alignment signals to the light-emitting elements, thereby reducing the need for separate dedicated alignment electrodes and simplifying the overall device structure
Solution Approach 2:
The storage capacitor function and alignment signal application function are merged into a single electrode structure, where the second capacitor electrode performs both roles simultaneously, reducing device complexity while maintaining alignment precision
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 design effectively suppresses parasitic electric fields, enhancing the fabrication process and improving the performance and reliability of the display device.
Implementation Method 1
A first alignment voltage may be applied to the second capacitor electrode in a fabrication mode of the display device
Data Source
AI summary
A display device comprises a first data conductive layer, a second data conductive layer on the first data conductive layer and comprising a first voltage line from which a first supply voltage is applied and a second voltage line from which a second supply voltage is applied, a first electrode on the second data conductive layer and extended in a direction and a second electrode spaced apart from the first electrode and extended in the second direction, and light-emitting elements each having an end on the first electrode and the second electrode. A first capacitor electrode and a second capacitor electrode forms a storage capacitor. The second capacitor electrode completely overlaps the light-emitting elements in a thickness direction, and partially overlaps the first electrode and the second electrode. A first alignment voltage is applied to the second capacitor electrode in a fabrication mode of the display device.