OLED Array Substrate Signal Line Layout for Brightness Consistency
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Solution Overview
Problem
Existing OLED display technologies face challenges in efficiently managing the driving current to maintain consistent illumination, particularly in pixel units with varying colors, leading to potential inefficiencies and inconsistencies in brightness.
Innovation Solution
The array substrate design incorporates a unique layout of signal lines with repeating and non-repeating portions, ensuring translational symmetry in certain directions, and overlapping projections of anodes and signal lines to optimize current distribution across different color subpixels, enhancing brightness consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines are arranged with repeating portions for translational symmetry, then manufacturing precision is improved, but brightness consistency deteriorates due to varying color subpixels
Solution Approach 1:
The patent applies local quality by making different portions of signal lines have different characteristics. Specifically, the first non-repeating portion has a different width than the second non-repeating portion, allowing each portion to be optimized for its specific function: the first portion overlaps with single-color anodes while the second portion overlaps with multi-color anodes, thereby achieving both manufacturing precision and brightness consistency
2Illumination intensity
If signal lines overlap with anodes of different colors, then brightness consistency is improved, but device complexity increases due to varying line configurations
Solution Approach 1:
The patent segments the signal lines into distinct portions with different characteristics. The signal lines are divided into first repeating portions, second repeating portions, first non-repeating portions, and second non-repeating portions. Each segment serves a specific purpose: repeating portions provide structural regularity while non-repeating portions with different widths optimize current distribution for different anode types, thereby managing device complexity while achieving brightness consistency
Data Source
AI summary
An array substrate includes a base substrate; and a second conductive layer on the base substrate. The second conductive layer includes a plurality of signal lines. The plurality of signal lines includes first lines and second lines. A first line of the first lines includes a first repeating portion and a first non-repeating portion. A second line of the second lines includes a second repeating portion and a second non-repeating portion. First repeating portions of the first lines and second repeating portions of the second lines are parts of repeating portions of the plurality of signal lines. Two repeating portions of the plurality of signal lines have translational symmetry along a first direction. The first non-repeating portion and the second non-repeating portion lack translational symmetry along the first direction.