OLED Power Pad Segmentation for IR Drop Reduction
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Solution Overview
Problem
In organic light emitting displays, the voltage reduction IR drop in power source lines leads to brightness deviations between pixels, particularly in larger panels, affecting uniformity and picture quality.
Innovation Solution
The solution involves arranging power source pads to receive voltages from both directions and using separate driving FPCBs for signal transmission, ensuring that the driving board does not overlap with the pixel unit, and distributing signal pads between power source pads to minimize voltage reduction IR drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased, then the display area is enlarged, but the voltage reduction IR drop increases causing brightness deviation
Solution Approach 1:
The power source line is segmented into multiple sections with intermediate power source pads distributed across the display panel. Each segment supplies power to a local region, reducing the length of individual power transmission paths and minimizing IR drop accumulation, thereby maintaining brightness uniformity across larger display areas.
Solution Approach 2:
Power source pads are arranged in a two-dimensional distribution pattern across the display panel rather than along a single linear path. This spatial redistribution reduces the maximum distance from any pixel to its nearest power source pad, effectively minimizing voltage reduction and brightness deviation in large-sized displays.
2Device complexity
If a single power source line configuration is used, then the structure is simple, but the voltage reduction IR drop causes non-uniform brightness
Solution Approach 1:
The power source line is divided into multiple segments connected through intermediate power source pads, creating a distributed power supply network. This segmentation reduces the effective length of each power transmission segment, minimizing IR drop and ensuring uniform brightness across the display panel.
Solution Approach 2:
Multiple power source pads are strategically positioned at different locations across the display panel to provide localized power supply. Each power source pad serves its surrounding region, ensuring that local voltage reduction is minimized and brightness uniformity is maintained throughout the entire display area.
3Device complexity
If power source pads are positioned at single locations, then the connection is simple, but the voltage reduction increases with distance
Solution Approach 1:
The power source line is segmented into multiple sections with intermediate power source pads distributed across the display panel. Each segment supplies power to a local region, reducing the length of individual power transmission paths and minimizing IR drop accumulation, thereby maintaining brightness uniformity.
Solution Approach 2:
Power source pads are arranged in a two-dimensional distribution pattern across the display panel rather than along a single linear path. This spatial redistribution reduces the maximum distance from any pixel to its nearest power source pad, effectively minimizing voltage reduction and brightness deviation in large-sized displays.
Data Source
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AI summary
An organic light emitting display which minimizes the IR drop of voltages supplied to an organic light emitting display panel includes an organic light emitting display panel (300) having a pixel unit on which an image is displayed and first and second power source pads provided at two or more edges outside the pixel unit to receive first and second voltages from at least two directions, and a voltage supplier Flexible Printed Circuit Board (FPCB) (400) including pads electrically coupled to the first and second power source pads and arranged on the outer circumference of the organic light emitting display so as not to overlap with the pixel unit.