Discontinuous Bank Pattern Layout for Uniform LED Pixel Emission
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Solution Overview
Problem
Display devices face challenges in reducing luminance variation due to uneven distribution and alignment of light emitting elements, leading to inconsistent pixel performance and potential dark spots.
Innovation Solution
The display device incorporates a second bank pattern with discontinuous areas and sub-patterns that allow for the uniform alignment of light emitting elements between electrodes, ensuring even luminance across the emission area by guiding light emission in a specific direction and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous bank patterns are used to guide light emitting elements, then alignment is improved, but luminance uniformity deteriorates due to uneven distribution
Solution Approach 1:
The second bank pattern is divided into multiple discontinuous segments (first bank pattern portion, second bank pattern portion, third bank pattern portion) arranged at different positions. This segmentation allows light emitting elements to be uniformly distributed across the emission area while maintaining proper alignment guidance, resolving the contradiction between alignment precision and luminance uniformity.
2Productivity
If light emitting elements are densely packed to improve resolution, then pixel density increases, but luminance variation worsens due to alignment difficulties
Solution Approach 1:
Different bank pattern portions are strategically positioned to provide localized guidance for light emitting elements in different regions of the emission area. The first bank pattern portion guides elements in a first region, the second bank pattern portion guides elements in a second region, and the third bank pattern portion guides elements in a third region, ensuring uniform distribution and reducing luminance variation while maintaining high pixel density.
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 enhances the uniformity of light emitting elements, reduces luminance variation, and improves the repair success rate of defective pixels, resulting in improved display performance and reduced dark spots.
Implementation Method 1
a first electrode, a second electrode, and a third electrode, respectively overlapping the first, second, and third bank patterns in a plan view; and light emitting elements arranged between the first electrode and the second electrode and between the second electrode and the third electrode
Implementation Method 2
Light emitted from the light emitting elements may be reflected by the first to third electrodes on the first to third bank patterns to advance in a third direction
Implementation Method 3
Light emitted from the light emitting elements may be reflected by the first to third electrodes on the first to third bank patterns to advance in a third direction intersecting the first direction and the second direction
Data Source
AI summary
A display device includes a first bank defining an emission area, a first bank pattern, a second bank pattern, and a third bank pattern, each disposed in the emission area, arranged in a first direction, and extending in a second direction intersecting the first direction, a first electrode, a second electrode, and a third electrode respectively overlapping the first, second, and third bank patterns in a plan view, and light emitting elements arranged between the first electrode and the second electrode and between the second electrode and the third electrode. The second bank pattern is discontinuously disposed.