Display Panel with Integrated Photoelectric Sensing and Segmented Cathodes
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Solution Overview
Problem
The integration of a photoelectric sensing element under the screen, such as for fingerprint recognition, increases the overall thickness of the display panel, making it difficult to achieve a lightweight and thin design.
Innovation Solution
The display panel integrates a light-emitting element and a photoelectric element on the same array substrate with non-contact cathodes and shared anodes, allowing for high integration and reduced thickness by utilizing a single film layer for both cathodes and anodes, and optimizing the arrangement of anodes and photosensitive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an independent photoelectric sensing element is adhered under the screen, then the photoelectric sensing function (e.g., fingerprint recognition) is achieved, but the overall thickness of the display screen increases
Solution Approach 1:
The patent merges the photoelectric sensing element with the display panel structure by integrating the photosensitive layer, anode, and cathode into the same film layer as the light-emitting element. This combination eliminates the need for separate adhesive layers and independent element mounting, thereby achieving photoelectric sensing functionality while reducing overall screen thickness
Solution Approach 2:
The display panel is designed to serve multiple functions: the same film layer contains both the light-emitting element for display purposes and the photoelectric element for sensing purposes (such as fingerprint recognition). This multi-functionality approach allows the display screen to perform both display and sensing tasks without requiring additional separate components that would increase thickness
2Device complexity
If the first cathode and second cathode are in the same film layer, then the device complexity is reduced and thickness is minimized, but the manufacturing precision requirements increase
Solution Approach 1:
The film layer is segmented into distinct functional regions: the first cathode region for the light-emitting element and the second cathode region for the photoelectric element. By dividing the cathode structure into separate non-contacting segments within the same film layer, the patent reduces overall device complexity and thickness while managing manufacturing precision requirements through clear spatial separation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the thickness of the display panel while maintaining functional integrity, facilitating a lightweight and thin design without compromising display or sensing performance.
Implementation Method 1
The photoelectric element has a second anode, a photosensitive layer, and a second cathode stacked in sequence along the direction away from the array substrate
Implementation Method 2
The light-emitting element has a first anode, a light-emitting functional layer, and a first cathode stacked in sequence along a direction away from the array substrate
Data Source
AI summary
A display panel includes an array substrate, a light-emitting element, and a photoelectric element. The array substrate has a first driving circuit and a second driving circuit, arranged at intervals. The light-emitting element, on the array substrate, is arranged corresponding to the first driving circuit. The light-emitting element has a first anode, a light-emitting functional layer, and a first cathode stacked in sequence along a direction away from the array substrate. The photoelectric element is located on the array substrate and on a side of the light-emitting element. The photoelectric element is arranged corresponding to the second driving circuit. The photoelectric element has a second anode, a photosensitive layer, and a second cathode stacked in sequence along the direction away from the array substrate. The first cathode and the second cathode are in a same film layer. The first cathode is not in contact with the second cathode.