Cover Plate Auxiliary Cathode Integration for OLED Display
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Solution Overview
Problem
The simultaneous disposition of an auxiliary cathode and an optical sensor on the cover plate in top emission type OLED display panels complicates the fabricating process, increases costs, and occupies excessive space.
Innovation Solution
A method involving sequential patterning processes to form a thin film transistor, optical sensor, and electrodes on a substrate, with an electrode connection layer including an auxiliary cathode and connection lines in the same layer, and a second electrode connected through a second electrode connection hole, optimizing the structure to reduce complexity and space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary cathode and an optical sensor are simultaneously disposed on the cover plate, then the display quality is improved, but the fabricating process becomes complicated and costly
Solution Approach 1:
The patent combines the auxiliary cathode and the optical sensor into a single integrated structure on the cover plate. The optical sensor is formed within the same layer as the auxiliary cathode, allowing both functions to be achieved simultaneously through a unified fabrication process rather than separate discrete components
Solution Approach 2:
The cover plate structure is designed to serve multiple functions: it acts as both the auxiliary cathode for electrical connection and as the substrate for the optical sensor. This multi-functional design eliminates the need for separate components and simplifies the overall fabricating process
2Reliability
If an auxiliary cathode and an optical sensor are simultaneously disposed on the cover plate, then the display quality is improved, but the occupied space of the cover plate is increased
Solution Approach 1:
The optical sensor is nested within the structure of the auxiliary cathode. The sensor is formed in a recess or within the same layer as the cathode material, allowing one component to be contained within or integrated into the other, thereby minimizing the total space occupied on the cover plate
Solution Approach 2:
The patent utilizes vertical layering and three-dimensional integration to accommodate both the auxiliary cathode and optical sensor. By stacking components in different layers and using vertical connections, the design reduces the horizontal footprint while maintaining both functional elements
3Illumination intensity
If the thickness of the cathode is reduced to ensure light transmittance, then the display quality is improved, but the resistance of the cathode increases
Solution Approach 1:
The patent merges the thin cathode layer with the auxiliary cathode structure on the cover plate. By integrating these conductive elements, the overall electrical pathway is enhanced, compensating for the increased resistance that results from using a thinner cathode for improved light transmittance
Data Source
AI summary
The present disclosure provides a cover plate, a fabricating method thereof, a display panel, and a display device. The cover plate includes a first substrate; a thin film transistor, an optical sensor, and a first electrode on the optical sensor which are sequentially disposed on the first substrate; a passivation layer covering the thin film transistor and the first electrode; a black matrix disposed on the passivation layer; an electrode connection layer disposed on the black matrix, the electrode connection layer including an auxiliary cathode and a first electrode connection line disposed in the same layer, and the first electrode connection line being connected with the first electrode by a first electrode connection hole penetrating through the passivation layer; and a planar layer and a second electrode sequentially disposed, the second electrode being connected with the auxiliary cathode by a second electrode connection hole penetrating through the planar layer.