OLED Display Panel Cathode Resistance Reduction via Embedded Electrodes
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Solution Overview
Problem
Current OLED display panels face issues with high cathode resistance leading to non-uniform screen brightness and increased thickness due to the placement of first electrode parts behind the encapsulating layer, and capacitive touch panels are costly and thick due to complex manufacturing processes.
Innovation Solution
The integration of touch electrodes and first electrode parts within the encapsulating layer, with second electrode parts on the same conductive layer, reduces cathode resistance and thickness, and simplifies manufacturing by reducing the number of film layers and processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If first electrode parts are placed behind the encapsulating layer to reduce cathode resistance, then cathode resistance is reduced, but the display panel thickness increases
Solution Approach 1:
The patent merges the first electrode parts with the encapsulating layer structure by placing them between the first and second inorganic layers. This integration allows the electrode parts to function within the encapsulating layer rather than adding extra thickness behind it, thereby reducing cathode resistance while avoiding increased panel thickness.
Solution Approach 2:
The patent transitions from a traditional planar arrangement where electrode parts are placed behind the encapsulating layer to a layered arrangement where electrode parts are embedded within the encapsulating layer structure. This dimensional reorganization allows simultaneous achievement of low cathode resistance and thin panel profile.
2Adaptability or versatility
If capacitive touch panels are added to OLED display panels, then touch functionality is achieved, but manufacturing cost and thickness increase due to complex processes
Solution Approach 1:
The patent combines the touch electrode layer with the first electrode parts layer, creating a multi-functional layer that serves both as cathode electrode and touch sensing electrode. This merging eliminates the need for separate touch panel manufacturing processes, reducing both complexity and cost while maintaining touch functionality.
Solution Approach 2:
The first electrode parts are designed to serve dual functions: as cathode electrodes for OLED operation and as touch electrodes for capacitive touch sensing. This multi-functionality reduces the number of required layers and simplifies the manufacturing process while achieving both display and touch capabilities.
3Reliability
If first electrode parts are placed behind the encapsulating layer, then cathode resistance is reduced, but the number of film layers and manufacturing processes increase
Solution Approach 1:
The patent integrates the first electrode parts within the encapsulating layer structure (between first and second inorganic layers), merging what would otherwise be separate functional layers. This reduces the total number of film layers while achieving low cathode resistance, simplifying both structure and manufacturing.
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes: a driving backplane; a cathode layer located at one side of the driving backplane; and an encapsulating layer located at the side, facing away from the driving backplane, of the cathode layer. The encapsulating layer includes a first inorganic layer, an organic layer and a second inorganic layer which are stacked. The display panel further includes: a first conductive layer located between the first inorganic layer and the organic layer, where the first conductive layer includes first electrode parts; and a second conductive layer located between the first conductive layer and the second inorganic layer and insulated from the first conductive layer.