Asymmetric Electrode Layout for Center-Aligned Light Emitting Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving stable and efficient alignment of light emitting elements due to eccentricity of the active layer, leading to difficulties in center alignment and potential short circuits.
Innovation Solution
The display device employs an asymmetric alignment electrode design to align light emitting elements using a single alignment signal, ensuring stable contact and reducing the risk of short circuits by using an insulating layer to expose polarities and minimize surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single alignment signal is used to align light emitting elements, then the alignment process is simplified and manufacturing efficiency is improved, but achieving stable center alignment becomes difficult due to active layer eccentricity
Solution Approach 1:
The patent applies asymmetry by designing the alignment electrode with different widths at opposite ends. Specifically, one end of the alignment electrode has a first width while the other end has a second width that is different from the first width. This asymmetric configuration compensates for the eccentricity of the active layer within the light emitting element, enabling stable center alignment using only a single alignment signal without requiring additional alignment signals or complex multi-step processes.
2Manufacturing precision
If alignment electrodes are positioned close to light emitting elements to improve alignment precision, then alignment accuracy increases, but the risk of short circuits between electrodes increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the alignment electrode and the light emitting element. This insulating layer is positioned between the alignment electrode and the active layer, preventing direct electrical contact while maintaining the close proximity needed for effective alignment. The insulating layer thus enables the electrode to be positioned close to the light emitting element for high alignment precision while simultaneously preventing short circuits and ensuring electrical stability.
3Manufacturing precision
If the alignment electrode covers the entire active layer area to ensure complete alignment, then alignment coverage is improved, but the complexity of the device structure and manufacturing process increases
Solution Approach 1:
The patent applies partial action by designing the alignment electrode to extend only partially over the active layer rather than covering the entire area. The electrode is configured with specific width variations at its ends, providing sufficient alignment coverage for the light emitting element without requiring full coverage of the active layer. This partial coverage approach achieves effective alignment while simplifying the device structure and reducing manufacturing 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 approach enables stable central alignment of light emitting elements, enhances electrical stability, and improves the lifespan and efficiency of the display device by preventing unwanted shorts and uniform dispersion of elements.
Implementation Method 1
at least one alignment electrode spaced apart from the other alignment electrode in a first direction, each of the alignment electrodes extending in a second direction crossing the first direction, and a width in the first direction of one of the alignment electrodes at one end in the second direction is different from a width in the first direction of the other alignment electrode at the other end in the second direction
Data Source
AI summary
A display device is provided. The display device includes a plurality of pixels disposed in a display area, each of the plurality of pixels includes a first electrode and a second electrode spaced apart from each other in a first direction, and at least one light emitting element disposed between the first electrode and the second electrode and electrically connected to the first electrode and the second electrode, and a distance in the first direction between one end of the light emitting element and one end of the second electrode is greater than a distance in the first direction between another end of the light emitting element and one end of the first electrode.