Display Power Line Mesh Layout to Prevent Pixel Dark Spots
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Solution Overview
Problem
In organic light-emitting display devices, current drop phenomena due to resistance in power lines can cause luminance differences between pixels and result in dark spots if a power line opens, affecting display quality.
Innovation Solution
A display device design featuring a power line and an initialization power line on different layers, with the initialization power line comprising oblique and intersecting conductive lines that bypass light-emitting elements, preventing voltage drops and ensuring power delivery even if the power line shorts or opens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power line is used to supply power to pixels, then the device complexity is reduced, but current drop due to resistance causes luminance differences and dark spots
Solution Approach 1:
The power line is segmented into multiple conductive lines (first and second conductive lines) that intersect to form multiple power supply paths. This segmentation allows power to reach pixels through alternative routes, preventing current drop and luminance differences while maintaining reasonable device complexity.
Solution Approach 2:
The power supply structure transitions from a single linear path to a two-dimensional mesh network formed by intersecting first and second conductive lines. This dimensional change creates multiple power supply paths, ensuring reliable power delivery to all pixels without significant current drop.
2Reliability
If power lines are extended to cover all pixels, then all pixels receive power, but the risk of dark spots increases if a power line opens
Solution Approach 1:
The power line system is divided into multiple intersecting conductive lines, creating a mesh structure where each pixel can be reached through multiple paths. This segmentation ensures that if one line opens, power can still reach all pixels through alternative routes, improving reliability without excessive complexity.
Solution Approach 2:
The intersecting mesh structure of multiple conductive lines provides built-in redundancy that cushions against line failures. Before any single line can cause a dark spot, the alternative paths already exist to compensate, preventing the harmful effect of line openings.
3Reliability
If initialization power line is added on a different layer, then power supply reliability is improved, but the device complexity increases
Solution Approach 1:
The initialization power line is placed on a different layer (third layer) than the main power line (second layer), adding a vertical dimension to the power supply architecture. This layered approach provides redundant power paths without significantly increasing in-plane complexity, as the lines are distributed across vertical layers rather than densely packed in a single plane.
Data Source
AI summary
A display device may includes: a substrate including a pixel area and a peripheral area; pixels provided in the pixel area of the substrate, each of the pixels including a light-emitting element provided with a pixel electrode; scan lines and data lines coupled to the pixels; a power line configured to supply driving power to the light-emitting elements, and extending in one direction; and an initialization power line configured to supply initialization power to the light-emitting elements. The power line and the initialization power line may be provided on different layers. The initialization power line may include: first conductive lines extending in a direction oblique to the scan lines and the data lines; and conductive lines intersecting the first conductive lines. The first and second conductive lines may be disposed in areas between the pixel electrodes of adjacent light-emitting elements.