Intersecting Initialization Power Lines for Uniform Pixel Luminance
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Solution Overview
Problem
Display devices face issues with current drop phenomena in power lines leading to luminance differences between pixels and potential dark spots due to power line openings, affecting display quality.
Innovation Solution
A display device design featuring a substrate with pixels, scan lines, data lines, and separate power lines and initialization power lines on different layers, where the initialization power line includes oblique and intersecting conductive lines to distribute power efficiently and prevent voltage drops, ensuring consistent power supply to all pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power lines are used to supply driving power to light-emitting elements, then power is delivered to pixels, but current drop due to resistance causes luminance differences between pixels
Solution Approach 1:
The power supply system is segmented into multiple independent power lines (first power line and second power line) that extend in different directions. This segmentation allows power to be delivered from multiple sources, reducing the impact of resistance-induced current drops in any single line and ensuring more uniform power distribution across all pixels.
2Power
If power lines extend across the display area to reach all pixels, then all pixels receive power, but openings in power lines cause dark spots in display
Solution Approach 1:
The power supply network is divided into multiple segments (first power line extending in first direction, second power line extending in second direction). This segmentation ensures that if one power line opens or fails, other segments remain functional and can continue to supply power to affected pixels, preventing dark spots and maintaining display continuity.
Solution Approach 2:
The patent introduces power lines extending in multiple directions (different dimensions) rather than relying on a single linear power line. By adding the second power line extending in a different direction from the first power line, the system creates a two-dimensional power distribution network that provides redundant pathways for power delivery, eliminating the vulnerability to single-point failures.
3Reliability
If multiple power lines are used to improve power distribution, then luminance uniformity improves, but device complexity increases
Solution Approach 1:
The first and second power lines are designed to serve multiple functions: they both supply driving power to light-emitting elements and provide redundancy for each other. This multi-functionality allows the system to achieve improved luminance uniformity and reliability without proportionally increasing complexity, as each power line can operate independently or in conjunction with the other.
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.