OLED Backplate Auxiliary Conducting Layers for Voltage Uniformity
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Solution Overview
Problem
In OLED backplate structures, the thinner cathode electrode has higher electrical resistance, leading to uneven in-plane voltages and brightness issues, particularly in large-scale displays, affecting the uniformity of the OLED display.
Innovation Solution
The introduction of multiple auxiliary conducting layers under the cathode, which contact the cathode and are manufactured using the same mask as the first electrode, reduces the electrical resistance and enhances conductivity, ensuring even in-plane voltages and improved display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode (cathode) is made thinner to reduce cost and improve light transmission, then the light transmission is improved and production cost is reduced, but the electrical resistance increases causing uneven in-plane voltages and brightness uniformity issues
Solution Approach 1:
The cathode system is segmented into multiple components: the thin second electrode (cathode) and separate auxiliary conducting layers. This segmentation allows the cathode to remain thin for light transmission while the auxiliary layers provide additional conductive pathways to compensate for resistance, resolving the contradiction between thinness and electrical resistance uniformity.
Solution Approach 2:
Auxiliary conducting layers are introduced as intermediary elements between the cathode and the substrate. These layers mediate the electrical conduction by providing alternative current paths that bypass the high-resistance regions of the thin cathode, thereby maintaining voltage uniformity without compromising the cathode's thin structure.
2Illumination intensity
If the second electrode (cathode) is made thinner to improve light transmission, then the light transmission is improved, but the in-plane voltage uniformity deteriorates causing mura effects
Solution Approach 1:
The cathode system is segmented into multiple components: the thin second electrode (cathode) and separate auxiliary conducting layers. This segmentation allows the cathode to remain thin for light transmission while the auxiliary layers provide additional conductive pathways to compensate for resistance, resolving the contradiction between thinness and electrical resistance uniformity.
Solution Approach 2:
The cathode system functions as a composite structure combining the thin second electrode material with auxiliary conducting layer materials. This composite approach leverages the optical properties of the thin cathode while utilizing the electrical properties of the auxiliary layers to maintain voltage uniformity across the display.
3Reliability
If auxiliary conducting layers are added under the cathode, then the electrical resistance is reduced and conductivity is enhanced, but the device complexity increases
Solution Approach 1:
The auxiliary conducting layers are merged with existing structural elements in the OLED backplate, such as the reflection layer or substrate patterns. By combining multiple functions into unified structures, the patent reduces overall device complexity while still achieving the conductivity enhancement benefits.
Solution Approach 2:
The auxiliary conducting layers serve multiple functions simultaneously: they provide electrical conduction pathways, act as reflection layers for light management, and serve as structural support elements. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
An OLED backplate structure is provided. Multiple auxiliary conducting layers contacting a cathode of the OLED are provided under the cathode in order to diminish the electrical resistance of the cathode to thereby enhance the conductivity of the cathode and to even the in plane voltages. The uniformity of the OLED display can be improved to prevent the uneven brightness issue and to decrease the thickness of the cathode for saving the production cost.