OLED Display Panel Segmentation for Thermal Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic electroluminescent displays (OELDs) face issues with the degradation of organic thin film transistors (OTFTs) due to high-temperature OLED array fabrication processes and require a planarization layer to address uneven driving circuit surfaces, which complicates the manufacturing process and can lead to defective displays.
Innovation Solution
The OELD design separates the OLED array and driving circuit onto distinct substrates, eliminating the need for a planarization layer and allowing for independent fabrication, with electrical connection units like conductive pads and dam-type banks to connect the components, enabling separate processing and protection from high-temperature damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the OLED array and driving circuit are integrated on the same substrate, then the device structure is simplified, but the driving circuit is damaged by high-temperature fabrication processes
Solution Approach 1:
The display device is divided into two separate panels: a first panel containing the OLED array and a second panel containing the driving circuit. This segmentation allows each component to be fabricated independently under optimal conditions, preventing the driving circuit from being damaged by high-temperature processes while maintaining a relatively simple overall device structure through the use of thin-film technologies in both panels.
2Ease of manufacture
If the driving circuit is formed on an uneven surface, then the manufacturing process is simplified, but the OLED array cannot be properly formed
Solution Approach 1:
By separating the driving circuit formation onto a distinct second panel, the uneven surface issue is isolated to the driving circuit panel where it does not affect OLED array formation. The OLED array on the first panel can be formed with high precision on its own flat substrate, while the driving circuit on the second panel can accommodate surface variations without compromising overall device performance.
3Manufacturing precision
If a planarization layer is added to the driving circuit, then the surface becomes flat for OLED formation, but the manufacturing process becomes more complex
Solution Approach 1:
The planarization requirement is eliminated by segmenting the device into two separate panels. Each panel has its own flat substrate that does not require additional planarization layers, thereby simplifying the manufacturing process while maintaining the necessary surface flatness for proper OLED array formation on the first panel.
4Reliability
If through holes are formed in the planarization layer, then electrical connection is achieved, but the risk of defects increases
Solution Approach 1:
By separating the OLED array and driving circuit onto different panels, the need to form through holes in a planarization layer is eliminated. Electrical connections are established through edge-contact methods or conductive structures on the panel edges, which significantly reduces the risk of defects associated with through-hole formation while maintaining reliable electrical connectivity between the two panels.
Data Source
AI summary
An organic electroluminescent display (“OELD”) includes an organic light-emitting diode (“OLED”) panel and a driving panel. The OLED panel includes an image display portion which displays an image using an OLED, and the driving panel includes a driving circuit portion which controls the image display portion. The OLED panel and the driving panel are combined into one body to complete the OELD. The image display portion and the driving circuit portion are electrically connected through pads disposed between the OLED panel and the driving panel, and the OLED panel and the driving panel are fabricated using separate processes, thus preventing the driving panel from being damaged by heat generated in the fabrication process of the OLED panel.