OLED Display Power Supply Segmentation for Voltage Uniformity
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Solution Overview
Problem
In display devices using OLEDs, issues with power supply positioning and wiring lead to deterioration in display quality due to uneven voltage distribution, which affects the downsizing and high-definition requirements.
Innovation Solution
The display device incorporates a configuration with data lines, data transfer lines, capacitance elements, and switches to manage voltage distribution, ensuring that reference and initialization voltages are supplied from both ends of the power supply line, reducing voltage drops and maintaining uniformity across the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel circuit is downsized to achieve reduction in display size and higher display definition, then the display resolution and size requirements are met, but the power supply positioning and wiring become unsuitable leading to voltage drop and deterioration in display quality
Solution Approach 1:
The power supply system is segmented into multiple independent power supply units distributed at different positions on the substrate. Each power supply unit independently supplies voltage to its local region, preventing voltage drop from propagating across the entire display. This segmentation allows the pixel circuits to be downsized for high definition while maintaining stable voltage supply through localized power sources.
2Area of moving object
If the pixel circuit is downsized to achieve reduction in display size, then the display size and definition requirements are met, but the power supply positioning and wiring become unsuitable leading to voltage unevenness
Solution Approach 1:
Different regions of the substrate are provided with local power supply capabilities through multiple distributed power supply units. Each power supply unit optimizes voltage supply for its local pixel circuit region, ensuring that voltage distribution remains uniform even when pixel circuits are downsized. This local quality approach allows the display to achieve compact size while maintaining stable voltage composition across the entire display area.
Data Source
AI summary
In a display device, first to second data lines, first to second data transfer lines, first to fourth capacitance elements, a power supply line to which a fixed voltage is supplied, a first switch provided between the first data transfer line and the second capacitance element, a second switch provided between the power supply line and the second capacitance element, a third switch provided between the second data transfer line and the fourth capacitance element, a fourth switch provided between the power supply line and the fourth capacitance element, a first power supply supplying the fixed voltage to one end of the power supply line, and a second power supply supplying the fixed voltage to another end of the power supply line.