OLED Electrode Lead Relocation to Packaging Sheet
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Solution Overview
Problem
Organic electroluminescent devices face issues with non-uniform luminescence, large frame size, and short device life due to electrode lead placement on substrates, which reduces the luminescent area and exposes leads to environmental damage.
Innovation Solution
Electrode leads are transferred to a packaging sheet for electrical connection with the control circuit, allowing for reduced frame size, improved luminescent area, and protection from environmental factors by using low-resistance metals like silver or aluminum, and incorporating an insulating layer to prevent electrical contact with cathodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If electrode leads are disposed on substrate, then electrical connection is achieved, but frame size increases and luminescent area is reduced
Solution Approach 1:
The patent extracts the electrode leads from the substrate and relocates them to the packaging sheet. This separation allows the substrate to be fully utilized for luminescence while the leads are positioned at the periphery on the packaging sheet, thus increasing the luminescent area and reducing the frame size occupied by leads.
Solution Approach 2:
The patent moves the electrode leads from the two-dimensional plane of the substrate to the packaging sheet, utilizing the peripheral region of the packaging sheet for lead placement. This dimensional repositioning allows the luminescent area on the substrate to be maximized while leads are accommodated on the packaging sheet's border.
2Illumination intensity
If electrode leads are disposed on substrate, then electrical connection is achieved, but luminescence uniformity deteriorates
Solution Approach 1:
By extracting the electrode leads from the substrate and placing them on the packaging sheet, the patent eliminates the lead region that caused non-uniform luminescence. The substrate surface is now fully available for uniform light emission, while electrical connection is maintained through the leads on the packaging sheet.
Solution Approach 2:
The packaging sheet serves as an intermediary that carries the electrode leads away from the luminescent region. This mediator allows electrical connection to be established without the leads interfering with the uniformity of light emission from the substrate.
3Duration of action of stationary object
If electrode leads are exposed to environment, then electrical connection is maintained, but device life is reduced
Solution Approach 1:
The patent uses the packaging sheet as a protective shell that encloses and protects the electrode leads from environmental factors such as moisture, oxygen, and contaminants. This protective encapsulation extends the device life by preventing degradation of the leads while maintaining their electrical connection function.
Solution Approach 2:
The packaging sheet creates a protected environment for the electrode leads, effectively isolating them from harmful atmospheric elements. This inert environment prevents oxidation and corrosion of the leads, thereby extending the operational life of the device.
4Area of stationary object
If packaging sheet area is less than substrate area, then packaging is achieved, but luminescent area is further reduced
Solution Approach 1:
The patent segments the packaging sheet into distinct functional regions: a central region that aligns with the substrate for luminescence, and a peripheral region that extends beyond the substrate to accommodate electrode leads. This segmentation allows the packaging sheet to serve both packaging and lead positioning functions without compromising the luminescent area.
Solution Approach 2:
The patent utilizes the peripheral dimension of the packaging sheet to position electrode leads, separating the lead placement function from the luminescent area. This dimensional arrangement allows the packaging sheet to be slightly larger than the substrate, providing space for leads while maximizing the luminescent region.
Data Source
AI summary
The present invention relates to an organic electroluminescent display, including a substrate, a set of anodes, an organic functional layer, a set of cathodes and a packaging sheet, wherein a set of electrode leads are disposed on the packaging sheet for electrical connection with a control circuit of the display, and the electrode leads includes a set of anode leads and a set of cathode leads which are electrically connected with the corresponding anodes and cathodes on the substrate, respectively. The present invention further relates to a double-sided organic electroluminescent display having the above features.