OLED Array Substrate Voltage Segmentation for Uniform Brightness
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Solution Overview
Problem
Existing OLED display technologies face challenges in maintaining consistent driving current for pixel units, leading to variations in brightness and efficiency due to the complexity of pixel-driving circuits and dummy circuits.
Innovation Solution
The array substrate incorporates a design with separate voltage supply lines for pixel and dummy circuits, providing distinct reference voltage signals to stabilize the driving current and improve brightness consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate voltage supply lines are provided for pixel circuits and dummy circuits, then driving current stability is improved, but device complexity increases
Solution Approach 1:
The voltage supply lines are segmented into separate third voltage supply lines for pixel circuits and fourth voltage supply lines for dummy circuits. This segmentation allows independent voltage control for different circuit types, stabilizing the driving current for pixel circuits while preventing voltage fluctuations from propagating to dummy circuits, thereby resolving the contradiction between reliability and device complexity.
Solution Approach 2:
Different regions of the array substrate are assigned different voltage supply characteristics. The pixel circuit region receives stable reference voltage through third voltage supply lines, while the dummy circuit region receives voltage through fourth voltage supply lines with different characteristics. This local differentiation ensures optimal voltage supply for each region's specific function, improving overall system reliability without requiring complete system redesign.
2Device complexity
If reference voltage signals are standardized across all circuits, then device complexity is reduced, but illumination uniformity deteriorates
Solution Approach 1:
The patent implements local quality by providing different reference voltage signals to different circuit regions. Third voltage supply lines provide reference voltage to pixel circuits for accurate display output, while fourth voltage supply lines provide reference voltage to dummy circuits for stable operation. This localized voltage differentiation ensures illumination uniformity across the display without requiring complex global voltage control systems.
Solution Approach 2:
The voltage supply system is segmented into function-specific lines that deliver appropriate reference voltages to different circuit types. This segmentation prevents voltage interference between pixel and dummy circuits, maintaining illumination uniformity while keeping the overall voltage supply configuration relatively simple and modular.
3Manufacturing precision
If dummy circuits are included in the array substrate, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges dummy circuits with pixel circuits in the same array substrate, providing both circuit types with separate but coordinated voltage supply lines. This merging allows the dummy circuits to serve as test structures and process monitors during manufacturing, improving manufacturing precision through better process control and yield analysis, while the separate voltage supply lines contain the complexity increase to a manageable level.
Data Source
AI summary
An array substrate is provided. The array substrate includes a plurality of first signal lines extending along a second direction, respectively. The plurality of first signal lines include a plurality of third voltage supply lines and a plurality of fourth voltage supply lines. A respective third voltage supply line of the plurality of third voltage supply lines is in a region having a column of pixel driving circuits. A respective fourth voltage supply line of the plurality of fourth voltage supply lines is in a region having a column of dummy circuits. The plurality of third voltage supply lines are configured to provide a first reference voltage signal. The plurality of fourth voltage supply lines are configured to provide a second reference voltage signal, the second reference voltage signal being different from the first reference voltage signal.