OLED Array Substrate Aperture Ratio via Layered Line Overlap
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Solution Overview
Problem
OLED pixels have a lower pixel aperture ratio due to dense vertical lines between sub-pixels, leading to low brightness and high power consumption in display devices.
Innovation Solution
The array substrate design includes data lines and power supply signal lines on different film layer surfaces, with partial overlap, allowing each column of sub-pixels to correspond to one data line and one power supply signal line, reducing the area occupied by circuit lines in the vertical direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data lines and power supply signal lines are disposed on the same film layer surface, then the manufacturing process is simpler, but the pixel aperture ratio decreases due to increased line density
Solution Approach 1:
The patent applies dimensionality change by moving power supply signal lines from the same film layer surface to a different film layer surface, allowing them to overlap with data lines in the vertical dimension. This spatial reconfiguration reduces the horizontal space occupied by circuit lines, thereby increasing the pixel aperture ratio from 40% to 50% or higher while maintaining manufacturing feasibility through standard multi-layer deposition processes
2Device complexity
If vertical lines are densely distributed between sub-pixels, then the device complexity is reduced, but the pixel aperture ratio decreases leading to lower brightness
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through multi-layer film structures. Power supply signal lines are positioned on a different film layer surface where they overlap with data lines, effectively reducing the horizontal footprint of vertical lines. This increases the pixel aperture ratio and subsequently improves display brightness without simplifying the pixel structure further
3Manufacturing precision
If vertical lines occupy greater area, then the manufacturing precision requirements are reduced, but the pixel aperture ratio decreases causing higher power consumption
Solution Approach 1:
The patent addresses this contradiction by relocating power supply signal lines to a different film layer surface where they overlap with data lines. This vertical separation reduces the horizontal area occupied by vertical lines, increasing the pixel aperture ratio. The larger aperture allows more light emission, thereby reducing power consumption for achieving the same brightness level
Data Source
AI summary
The present disclosure provides an array substrate which comprises a plurality of sub-pixels distributed in an array arrangement, wherein data lines and power supply signal lines are disposed between two adjacent columns of the sub-pixels; wherein the data lines and the power supply signal lines are prepared respectively on different film layer surfaces, and the data lines and the power supply signal lines at least partially overlap. The present disclosure further provides an OLED display device which comprises the array substrate. The array substrate of the present disclosure has a higher aperture ratio.