Display Bank Protrusions to Block Subpixel Leakage Current
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Solution Overview
Problem
As the resolution of light emitting display apparatuses increases, the narrowing distance between subpixels leads to leakage currents between neighboring pixels, causing image distortion and reduced color reproduction rates due to electrons moving laterally.
Innovation Solution
Incorporating a bank with protrusions to block lateral leakage currents by increasing the distance electrons can move between neighboring subpixels, and arranging the light emitting element layer along the unevenness of the bank to prevent electron movement to adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between subpixels is reduced to increase resolution, then the image quality and detail are improved, but lateral leakage current increases causing image distortion and visibility defects
Solution Approach 1:
An insulating layer is introduced between adjacent subpixels to block lateral leakage current. This intermediary layer prevents electron migration from one subpixel to another, solving the leakage current problem that arises when subpixels are positioned close together for high resolution displays.
Solution Approach 2:
The insulating layer is selectively applied only in the regions between adjacent subpixels where leakage current occurs, rather than uniformly across the entire display. This localized approach blocks harmful current while maintaining the close spacing of subpixels needed for high resolution.
2Measurement precision
If the distance between subpixels is reduced to increase resolution, then more information can be displayed, but color reproduction accuracy deteriorates due to electron migration between subpixels
Solution Approach 1:
The insulating layer acts as a barrier that prevents electron migration between adjacent subpixels. By blocking the path of electron diffusion, it ensures that each subpixel maintains its electrical independence and color purity, even when positioned very close to other subpixels for high resolution displays.
3Measurement precision
If the distance between subpixels is reduced to increase resolution, then the display becomes more detailed, but visibility defects occur due to leakage current
Solution Approach 1:
The insulating layer is positioned between adjacent subpixels to block lateral leakage current paths. This intermediary structure prevents the harmful electrical interactions that cause visibility defects such as ghosting or unintended light emission, ensuring reliable image display at high resolutions.
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
Prevents visibility defects and improves color reproduction by blocking lateral leakage currents, maintaining image quality and color accuracy.
Implementation Method 1
a bank having at least one protrusion to block a lateral leakage current that increases as a distance between neighboring subpixels decreases
Data Source
AI summary
A display apparatus includes a substrate including emitting portions and a non-emitting portion between the emitting portions, a first subpixel and a second subpixel disposed at the light emitting portions, first electrodes respectively disposed at the first subpixel and the second subpixel and disposed on the substrate, a bank disposed on the first electrodes and disposed at the non-emitting portion and including at least one protrusion protruded on an upper surface of the bank, a light emitting element layer disposed on the first electrodes of the emitting portions and the non-emitting portion and the bank, and including a plurality of light emitting units and a charge generation layer between the plurality of light emitting units, and a second electrode disposed on the light emitting element layer.