Pixel Alignment Electrode Layout to Prevent Display Element Misalignment
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Solution Overview
Problem
Current display devices face challenges in efficiently arranging light-emitting elements due to electric field biases during the alignment process, leading to arrangement failures and reduced light emission efficiency.
Innovation Solution
Incorporating a dummy electrode between emission areas of pixels that overlaps with a bank, providing alignment signals to alignment electrodes, and using a floating electrode configuration to minimize electric field effects on the bank, thereby ensuring uniform alignment and improved light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment electrodes are used to arrange light-emitting elements, then alignment capability is improved, but electric field biases cause arrangement failures and reduce light emission efficiency
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between the alignment electrode and the bank. This dummy electrode acts as a mediator that blocks or shields the electric field from directly acting on the bank, thereby preventing electric field biases that cause arrangement failures while maintaining the alignment function of the alignment electrode
Solution Approach 2:
The invention converts the harmful electric field effect into a beneficial shielding mechanism. By placing a conductive dummy electrode between the alignment electrode and bank, the electric field is redirected or absorbed by the dummy electrode, protecting the bank from harmful biases while the alignment electrode continues to provide alignment signals
2Productivity
If alignment signals are applied to alignment electrodes, then light-emitting elements can be arranged, but electric field effects on the bank cause arrangement failures
Solution Approach 1:
The dummy electrode serves as a protective intermediary that allows alignment signals to be applied to alignment electrodes for efficient arrangement of light-emitting elements, while simultaneously blocking the harmful electric field effects from reaching the bank, thus maintaining both productivity and precision
3Reliability
If a dummy electrode is added to block electric field biases, then arrangement reliability is improved, but device complexity increases
Solution Approach 1:
The electrode structure is segmented into distinct functional components: the alignment electrode for providing alignment signals, the dummy electrode for blocking electric field biases, and the bank for defining emission areas. This segmentation allows each component to perform its specific function independently, improving reliability while keeping the overall structure manageable through clear functional division
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 dummy electrode configuration reduces arrangement failures and enhances light emission efficiency by eliminating electric field biases on the bank, allowing for more uniform alignment of light-emitting elements and improved light reflection and transmission.
Implementation Method 1
applying an alignment signal to alignment electrodes
Implementation Method 2
dummy electrode that is located between emission areas of pixels and overlaps with a bank... eliminating electric field biases on the bank
Data Source
AI summary
A display device comprises a first pixel including a first emission area, a second pixel including a second emission area spaced apart from the first emission area in a first direction, and a bank partitioning the first emission area and the second emission area, wherein the first pixel includes a first alignment electrode, a second alignment electrode, and a third alignment electrode sequentially located, spaced apart from each other in the first direction, and overlapping with the first emission area, first light-emitting elements above, and overlapping with, the first alignment electrode and the second alignment electrode, second light-emitting elements above, and overlapping with, the second alignment electrode and the third alignment electrode, and a dummy electrode between the first emission area and the second emission area, and overlapping with the bank.