Sub-Pixel Bank Layer Layout to Prevent Display Dark Spots
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Solution Overview
Problem
Display devices face issues with dark spot defects due to driving defects in sub-pixels, which can lead to noticeable dark spots even when light is emitted from adjacent sub-pixels.
Innovation Solution
A display device design that includes a substrate with adjacent first and second pixels, electrodes, insulating layers, light-emitting elements, and a bank layer that divides emission areas and sub-areas, preventing driving defects and reducing the likelihood of dark spots by ensuring light-emitting elements are properly connected and positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting elements are arranged in sub-pixels without additional protective structures, then the device complexity is reduced, but dark spot defects occur due to driving defects in sub-pixels
Solution Approach 1:
The patent introduces a bank layer that segments the pixel structure into distinct emission areas and sub-areas. This segmentation isolates light-emitting elements within specific regions, preventing defect propagation between adjacent sub-pixels while maintaining overall device functionality.
Solution Approach 2:
The bank layer acts as an intermediary structure between adjacent sub-pixels. It provides physical separation and electrical isolation, serving as a mediator that prevents driving defects in one sub-pixel from affecting neighboring sub-pixels, thereby eliminating dark spot defects without requiring complete redesign of the light-emitting structure.
2Reliability
If a bank layer is introduced to divide emission areas, then dark spot defects are prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The bank layer serves multiple functions simultaneously: it divides emission areas, provides electrical isolation between sub-pixels, supports light-emitting elements, and prevents defect propagation. This multi-functionality reduces the need for additional separate structures, thereby limiting the increase in manufacturing complexity while achieving reliable defect prevention.
3Manufacturing precision
If light-emitting elements are densely packed in sub-pixels, then the display resolution is improved, but the likelihood of dark spot defects increases
Solution Approach 1:
The patent applies local quality by creating distinct regions with different properties within each pixel. The bank layer defines specific emission areas where light-emitting elements are densely packed for high resolution, while adjacent sub-areas provide isolation zones. This local differentiation allows dense packing where needed while preventing defect propagation through strategically placed barriers.
Data Source
AI summary
A display device includes: a substrate including a first pixel and a second pixel that are adjacent to each other in a first direction, the first pixel including a sub-pixel and the second pixel including sub-pixel; a first electrode and a second electrode above the substrate and extending in the first direction, the first electrode and the second electrode being in the sub-pixels; a first insulating layer above the first electrode and the second electrode; light-emitting elements above the first insulating layer between the first electrode and the second electrode; a bank layer above the first insulating layer and dividing a first emission area and a second emission area of one of the sub-pixels and dividing a sub-area of the first pixel and a sub-area of the second pixel; and a first connection electrode and a second connection electrode in the sub-pixels.