OLED Mesh Power Lines Reduce Voltage Drop
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Solution Overview
Problem
Organic light emitting displays face issues with brightness non-uniformity between pixels due to voltage drop variations, affecting picture quality, especially when pixel power lines are not uniformly distributed.
Innovation Solution
The implementation of a mesh-type pixel power line structure using metals with low resistance for the main power lines and higher resistance metals for auxiliary lines, coupled through power buses to reduce voltage drop and ensure uniform power distribution across the display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pixel power line structures are used, then the display unit can be manufactured with standard processes, but voltage drop varies across pixels causing brightness non-uniformity
Solution Approach 1:
The pixel power line is divided into multiple segments arranged in a mesh pattern, with each segment connecting to adjacent pixels. This segmentation reduces the distance from power supply to each pixel, minimizing voltage drop variations and improving brightness uniformity across the display.
Solution Approach 2:
The power line structure transitions from a conventional linear or grid arrangement to a mesh configuration that adds connectivity in multiple dimensions. This mesh structure provides multiple power supply paths to each pixel, reducing voltage drop and ensuring uniform power delivery across the display area.
2Area of stationary object
If power lines are extended to cover larger display areas, then more pixels can be powered, but voltage drop increases causing brightness non-uniformity
Solution Approach 1:
The extended power line is segmented into multiple shorter sections connected in a mesh pattern. Each segment serves a local group of pixels, reducing the maximum distance power must travel and minimizing voltage drop even as the overall display area increases.
Solution Approach 2:
The mesh structure introduces intermediate connection points where power can be redistributed. These intermediate nodes act as mediators that reduce the burden on any single power line segment, ensuring stable voltage delivery across large display areas.
3Reliability
If uniform power distribution is achieved through mesh-type power lines, then brightness uniformity improves, but manufacturing complexity increases
Solution Approach 1:
The mesh-type power line structure serves multiple functions simultaneously: it provides power distribution, acts as a voltage stabilization network, and enables uniform brightness across the display. This multi-functionality justifies the increased manufacturing complexity by delivering superior performance in multiple aspects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces voltage drop and brightness non-uniformity, enhancing picture quality by ensuring consistent power delivery to all pixels regardless of their position on the display.
Implementation Method 1
The organic light emitting display displays an image using organic light emitting diodes (OLEDs) that generate light by re-combination of electrons and holes
Implementation Method 2
a metal having low resistance may be used as the pixel power line regardless of the shape of the display unit so that the voltage drop of the pixel power may be reduced
Data Source
AI summary
An organic light emitting display and a method of manufacturing the organic light emitting display are provided. The organic light emitting display includes a display unit including pixels coupled to scan lines, data lines, emission control lines, and power lines, a scan driver on a side of the display unit and coupled to the scan lines, an emission control driver on another side of the display unit and coupled to the emission control lines, a first power pad on a side of one of the scan driver or the emission control driver for receiving power, a second power pad on another side of the one of the scan driver or the emission control driver, the second power pad coupled to the power lines, and power buses coupling the first power pad and the second power pad to each other.