OLED Vss Lead Lapping Length Variation for Voltage Attenuation
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Solution Overview
Problem
Current organic electroluminescent devices experience signal current attenuation due to continuous voltage reduction along the Vss lead from the starting end to the terminating end, leading to uneven display issues as display sizes increase.
Innovation Solution
The design includes an organic electroluminescent device with a substrate and an organic luminescent layer featuring pixel points with a first electrode that laps with a Vss lead, where the length or area of the lapping portions increases from the starting end to the terminating end, reducing contact resistance and voltage attenuation by increasing the exposed area of the lapping portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display device size is increased, then the display area is improved, but current attenuation increases due to continuous voltage reduction along the Vss lead
Solution Approach 1:
The patent applies local quality by varying the lapping length of the first electrode with the Vss lead according to position. Specifically, the lapping length increases from the starting end to the terminating end of the Vss lead, creating non-uniform contact characteristics that compensate for voltage attenuation in different regions of the large display device.
Solution Approach 2:
The patent changes the geometric parameter of the electrode-llead overlap region by adjusting the lapping length. This parameter change increases the contact area and reduces contact resistance at positions where voltage attenuation is more severe, thereby compensating for the voltage drop in large display devices.
2Reliability
If the lapping length of the first electrode with Vss lead is increased, then contact resistance is reduced, but device complexity increases
Solution Approach 1:
The patent segments the display device into multiple regions along the Vss lead direction, with each region having a different lapping length. This segmentation allows the device to be divided into pixel units, where each pixel's first electrode has a specific lapping length corresponding to its position, thereby reducing overall device complexity through modular design.
Solution Approach 2:
Instead of making the lapping length uniform and adding complex external compensation circuits, the patent inverts the approach by making the lapping length itself the compensation mechanism. The varying lapping lengths are designed directly into the electrode structure to counteract voltage attenuation, eliminating the need for additional complex components.
3Reliability
If the lapping length increases from starting end to terminating end, then voltage consistency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-designing and pre-calculating the optimal lapping lengths for different positions during the manufacturing planning stage. The varying lapping lengths are incorporated into the original electrode pattern design, allowing for centralized control and compensation during the manufacturing process rather than requiring post-manufacturing adjustments.
Solution Approach 2:
The electrode structure serves itself by using its own geometric configuration (varying lapping lengths) to compensate for voltage attenuation. This self-service mechanism eliminates the need for external compensation circuits or additional control systems, as the structure inherently corrects the voltage inconsistency through its design.
Data Source
AI summary
The application discloses an organic electroluminescent device. The organic electroluminescent device includes: a substrate; and an organic luminescent layer including an array of pixel points which include a first electrode, and the first electrode of the pixel points laps with a Vss lead. A length of the first electrode lapping with the Vss lead increases from a starting end of the Vss lead toward a terminating end of the Vss lead.