OLED Cathode Voltage Line Segmentation for Heat Reduction
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Solution Overview
Problem
In OLED displays, heat generation occurs at the lower portion of the display panel due to current buildup at the end of the low driving voltage (ELVSS) wire, which can lead to burnt defects and reduced performance.
Innovation Solution
The implementation of a metal layer on the non-display area with an inorganic insulating layer between the driving voltage line and the low driving voltage line, along with a second voltage line that surrounds the display area and is electrically connected to the cathode electrode, helps to prevent current buildup and reduce heat generation by dispersing the current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the low driving voltage wire is positioned at one end to simplify the structure, then the device complexity is reduced, but heat generation and burnt defects occur due to current buildup
Solution Approach 1:
The low driving voltage wire is segmented into multiple sections positioned at different locations (including both ends and intermediate positions) rather than concentrated at one end. This segmentation distributes the current flow paths, preventing current buildup at any single location and thereby reducing heat generation and burnt defects while maintaining structural simplicity
Solution Approach 2:
Different regions of the display panel are provided with different wire configurations - the low driving voltage wire is strategically positioned at specific locations (ends and intermediate positions) based on local current distribution requirements. This local optimization ensures uniform current density across different areas, preventing harmful heat accumulation at specific spots
2Manufacturing precision
If current is concentrated at one location to reduce manufacturing steps, then the manufacturing precision requirements are relaxed, but heat generation increases causing burnt defects
Solution Approach 1:
The wire structure is divided into multiple segments positioned at different locations rather than concentrated at one point. This segmentation naturally distributes current flow across multiple paths, reducing current density and heat generation at any single location, thereby preventing burnt defects without requiring extremely high manufacturing precision
Solution Approach 2:
Instead of concentrating the wire at one location in a single dimension, the low driving voltage wire is extended to multiple locations (both ends and intermediate positions) across the display panel. This dimensional distribution of wire positions creates multiple current pathways, effectively dispersing heat generation and preventing localized overheating
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 configuration effectively reduces heat generation at the lower portion of the OLED display panel, minimizing the risk of burnt defects and enhancing the display's reliability and longevity.
Implementation Method 1
an inorganic insulating layer between the driving voltage line and the low driving voltage line
Implementation Method 2
a metal layer disposed on the non-display area of the substrate
Implementation Method 3
an organic insulating layer covering the first voltage line and the second voltage line
Data Source
AI summary
An organic light emitting diode display is described which includes a substrate having a display area and a non-display area; a metal layer disposed on the non-display area of the substrate, an insulating layer, a voltage line disposed on the gate insulating layer and receiving a driving voltage, a second voltage line disposed on the gate insulating layer and receiving a low driving voltage, an organic insulating layer, and a cathode electrode disposed on the organic insulating layer. The second voltage line and the cathode electrode are electrically connected to each other through an opening formed in the organic insulating layer, and the first voltage line or the second voltage line is electrically connected to the metal layer through an opening formed in the gate insulating layer.