Alignment Electrode Layout for Display LED Misalignment Control
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Solution Overview
Problem
In the manufacturing of display devices, the alignment of light emitting elements with alignment electrodes is challenging due to the formation of electric fields on the bank's vertical extension parts, leading to defects where elements are misaligned or separated from their intended positions.
Innovation Solution
The display device design includes alignment electrodes arranged such that only one alignment signal is transferred to each electrode overlapping with the bank's vertical extension parts, suppressing the electric field and minimizing defects by using a specific configuration of alignment electrodes and signals to align light emitting elements in three serial stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment electrodes are arranged to overlap with the bank's vertical extension parts, then light emitting elements can be aligned using alignment signals, but electric fields are formed on the vertical extension parts causing misalignment defects
Solution Approach 1:
The alignment electrodes are segmented into different types: first and third alignment electrodes overlap with emission areas, while second and fourth alignment electrodes overlap with both emission areas and the bank's vertical extension parts. This segmentation allows different electrodes to serve different functions - some for alignment and others for suppressing electric field interference on the vertical extension parts.
Solution Approach 2:
Different regions of the alignment electrodes have different properties. The electrodes overlapping with vertical extension parts are configured to receive different alignment signals than those overlapping only with emission areas. This local differentiation enables the system to suppress electric field formation in specific locations while maintaining alignment functionality in other locations.
2Manufacturing precision
If multiple alignment signals are applied to alignment electrodes overlapping with vertical extension parts, then alignment can be achieved, but electric fields are generated causing elements to be separated from intended positions
Solution Approach 1:
The patent converts the potentially harmful effect of electric fields into a beneficial alignment mechanism. By carefully controlling which electrodes receive which signals, the electric fields that would normally cause separation are instead used to enhance alignment precision in the emission areas while being suppressed in the vertical extension parts.
Solution Approach 2:
The alignment electrodes serve as intermediaries between the alignment signals and the light emitting elements. By strategically positioning and configuring these intermediate electrodes, the system mediates between the need for alignment signals and the need to suppress electric field interference, allowing signals to be transmitted where needed while blocking them where harmful.
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 effectively reduces the arrangement defects of light emitting elements on the bank's vertical extension parts, ensuring accurate alignment and improving the overall manufacturing process efficiency.
Implementation Method 1
the first alignment electrode and the third alignment electrode are configured to receive a first alignment signal, and the second alignment electrode and the fourth alignment electrode is configured to receive a second alignment signal
Implementation Method 2
a bank on the first, second, third, and fourth alignment electrodes, the bank including first and second horizontal extension parts extending in the first direction and first, second, and third vertical extension parts extending in a second direction crossing the first direction, the bank partitioning the first emission area and a second emission area
Data Source
AI summary
A display device includes: first to fourth alignment electrodes sequentially arranged while being spaced from each other in a first direction in a first emission area; a bank on the first to fourth alignment electrodes, the bank including first and second horizontal extension parts extending in the first direction and first to third vertical extension parts extending in a second direction crossing the first direction, the bank partitioning the first emission area and a second emission area; first light emitting elements overlapping with the first alignment electrode and the second alignment electrode on the first alignment electrode and the second alignment electrode; second light emitting elements overlapping with the second alignment electrode and the third alignment electrode on the second alignment electrode and the third alignment electrode; and third light emitting elements overlapping with the third and fourth alignment electrodes on the third and fourth alignment electrodes.