Light Emitting Display Power Bridge Lines for Aperture Ratio Repair
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Solution Overview
Problem
In organic light emitting display devices, the reduction in pixel size and increase in resolution lead to higher probabilities of defects such as dark points and line defects, which complicates repair processes and reduces the aperture ratio of subpixels, especially when bypassing power wiring lines to fix disconnections.
Innovation Solution
The design includes a light emitting display device with a subpixel structure featuring a gate line and power lines that include bridge lines and reference lines, allowing for efficient repair of defects by overlapping and connecting these lines to maintain the aperture ratio and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to increase resolution, then the display resolution is improved, but the aperture ratio of subpixels is reduced and defect probability increases
Solution Approach 1:
The power line configuration transitions from a single linear path to a multi-dimensional bridge structure spanning across the gate line. The first and second power bridge lines create a spatial distribution that utilizes the vertical dimension (first direction) to maintain power supply functionality while preserving horizontal aperture space.
Solution Approach 2:
The power line is segmented into multiple bridge lines (first and second power bridge lines) that are spatially separated in the first direction. This segmentation allows each bridge line to independently span the gate line, providing redundancy and maintaining aperture ratio by distributing the power supply function across multiple discrete elements rather than requiring a single continuous line.
2Ease of repair
If power wiring lines are used as bypass paths for repair, then line defects can be repaired, but all pixels around the power wiring lines may become dark points and aperture ratio is reduced
Solution Approach 1:
The power line is divided into multiple bridge lines that are spaced apart in the first direction. This segmentation creates distinct, separated power supply paths that can serve as bypass routes for defect repair without requiring a single continuous line that would occupy excessive aperture space. The segmented structure provides multiple discrete repair options.
Solution Approach 2:
The power bridge lines extend in the second direction (crossing the gate line) while being spaced in the first direction, creating a two-dimensional power distribution network. This dimensional approach allows repair paths to be established without compromising the horizontal aperture area, as the bridge lines utilize the vertical spacing to their advantage.
3Device complexity
If a single power line is used, then the structure is simple, but repair capability is limited and aperture ratio cannot be optimized
Solution Approach 1:
The power line is segmented into multiple bridge lines that can function independently or collectively. This segmentation enhances repair capability by providing multiple potential bypass paths, while the overall structure remains relatively simple as the bridge lines follow a consistent pattern of spanning the gate line in the second direction with spacing in the first direction.
Data Source
AI summary
A light emitting display device comprises a subpixel having a light emitting element disposed in a light emission area on a substrate and a circuit area in which a circuit for driving the light emitting element is disposed, a gate line disposed in the circuit area in a first direction, and at least one power line disposed in a second direction crossing the first direction, the at least one power line including a first power bridge line and a second power bridge line which are spaced apart from each other in the first direction.