Display Electrode Bank Layer to Prevent LED Agglomeration
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Solution Overview
Problem
Display devices face issues with light emitting elements agglomerating outside the alignment area due to electric fields formed between electrodes receiving different voltages, leading to potential dark spots and reduced image quality.
Innovation Solution
Incorporating a bank layer with an organic insulating material and a dielectric constant of 2 to 4, which overlaps the electrode body portions and extension portions, effectively reducing the electric field intensity and preventing light emitting elements from agglomerating outside the alignment area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrodes receive different voltages to enable light emitting element alignment, then alignment function is achieved, but electric field forms between electrodes causing light emitting elements to agglomerate outside alignment area
Solution Approach 1:
An insulating layer is introduced between the first electrode and second electrode to act as an intermediary that blocks electric field formation while allowing both electrodes to maintain their voltage differences for alignment functionality
Solution Approach 2:
The space between electrodes is segmented by dividing it into distinct regions: an alignment area where light emitting elements are intended to align, and a non-alignment area separated by the insulating layer to prevent unwanted agglomeration
2Reliability
If bank layer with organic insulating material is added to reduce electric field intensity, then light emitting element agglomeration is prevented, but device structure becomes more complex
Solution Approach 1:
The bank layer serves multiple functions simultaneously: it acts as an insulating barrier to reduce electric field intensity, provides structural support for the alignment area, and defines the boundaries for light emitting element placement, thereby reducing agglomeration outside the alignment area
Solution Approach 2:
The bank layer is merged with the electrode structure such that it extends from the electrode body portions and integration points are formed, combining the insulating function with the structural framework in a unified design
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 bank layer effectively reduces the electric field intensity between electrodes, preventing light emitting element agglomeration and minimizing dark spots, thereby enhancing image quality and stability in display devices.
Implementation Method 1
a bank layer extended in the second direction, and surrounding subpixels... The bank layer may have a dielectric constant of about 2 to about 4
Implementation Method 2
electric fields formed between electrodes receiving different voltages... effectively reducing the electric field intensity
Data Source
AI summary
A display device is provided. The display device includes a first electrode extended in a first direction, a second electrode spaced apart from the first electrode in a second direction crossing the first direction, and extended in the first direction, a bank layer extended in the second direction, and surrounding subpixels, and a light emitting element on the first electrode and the second electrode, wherein at least one of the first electrode or the second electrode includes an electrode extension portion extended in the first direction, and an electrode body portion connected to the electrode extension portion, and having a width that is greater than that of the electrode extension portion, and wherein the bank layer overlaps the electrode body portion with a first width, and includes an organic insulating material.