DC-DC Converter Placement for OLED Long Range Uniformity
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Solution Overview
Problem
Large organic light-emitting display devices face issues with long range uniformity (LRU) due to significant IR voltage drops caused by long distances between DC-DC converters and the image display unit, leading to non-uniform voltage supply and reduced image quality.
Innovation Solution
Mounting multiple DC-DC converters on flexible printed circuit boards or tape carrier packages closer to the image display unit, with phase control operations to maintain static voltages and supply identical voltages and currents, thereby reducing IR drops and ensuring uniform voltage distribution across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DC-DC converters are placed far from the image display unit, then device complexity is reduced, but voltage uniformity deteriorates due to significant IR voltage drops
Solution Approach 1:
The patent divides the DC-DC conversion function into multiple segments by placing multiple converters at different locations (center and edges) of the image display unit. This segmentation allows each converter to serve a specific region, reducing the distance between converters and display pixels, thereby minimizing IR voltage drops and improving voltage uniformity across the large display panel.
Solution Approach 2:
The patent applies local quality by positioning DC-DC converters at specific locations (center and edges) rather than using a single centralized converter. Each converter is strategically placed to serve its local region, ensuring that voltage is supplied from nearby locations and reducing regional voltage variations across the display surface.
2Manufacturing precision
If multiple DC-DC converters are mounted closer to the image display unit, then voltage uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the voltage supply function by using multiple DC-DC converters distributed at the center and edges of the image display unit. This segmentation reduces the distance between converters and display pixels, minimizing IR voltage drops and improving voltage uniformity across the large display panel.
Solution Approach 2:
The patent achieves equipotentiality by strategically placing multiple DC-DC converters at the center and edges of the image display unit, ensuring that voltage is supplied from multiple nearby locations. This configuration minimizes potential differences across the display, maintaining equipotential conditions and improving voltage uniformity.
3Manufacturing precision
If phase control operations are implemented with multiple converters, then long range uniformity is improved, but control complexity increases
Solution Approach 1:
The patent implements periodic action through phase control operations where multiple DC-DC converters operate with phase-shifted switching signals. The converters are controlled to switch at different phases, which distributes the dynamic current demand over time and reduces peak current demands, thereby minimizing IR voltage drops and improving long range uniformity.
Solution Approach 2:
The patent ensures continuity of useful action by coordinating the phase control operations of multiple DC-DC converters. The converters are controlled to operate in a complementary manner, ensuring continuous and smooth voltage supply to the image display unit, which reduces voltage fluctuations and improves long range uniformity.
Data Source
AI summary
An organic light-emitting display device that increases long range uniformity (LRU). The organic light-emitting display device includes an image display unit including a plurality of pixels defined by a plurality of scan lines and a plurality of data lines, a plurality of film type connection devices electrically connected to the image display unit and at least one DC-DC converter arranged on the plurality of film type connection devices to supply driving voltages to the image display unit.