OLED Touch Display Panel Cathode Layer Multiplexing
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Solution Overview
Problem
Current OLED touch display technologies involve forming touch electrodes outside the encapsulated layer of the OLED display panel, which complicates the manufacturing process and increases costs.
Innovation Solution
A touch display panel design where subpixels are arranged in a matrix on an array substrate with independent anode layers and connected cathode layers, and a driver chip outputs signals to the cathode layers through conductive wires, allowing for multiplexing of cathode layers as touch electrodes during the touch period, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch electrodes are formed outside the encapsulated layer of the OLED display panel, then touch functionality is achieved, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent merges the touch electrode function with the cathode layer of the OLED subpixels. The cathode layer serves dual purposes: as the electron injection electrode for the OLED and as the touch sensing electrode. This integration eliminates the need for separate touch electrode structures outside the encapsulated layer, thereby simplifying the manufacturing process and reducing structural complexity while maintaining both display and touch functionalities
Solution Approach 2:
The cathode layer is designed to perform multiple functions simultaneously: it acts as the cathode for OLED light emission and as the touch electrode for capacitive sensing. By making the cathode layer universal, the patent eliminates the need for dedicated touch electrode structures, simplifying the overall device architecture and manufacturing process
2Ease of manufacture
If independent touch electrodes are formed outside the encapsulated layer, then touch performance is maintained, but production costs increase
Solution Approach 1:
The patent combines the cathode layer material to serve dual functions as both OLED cathode and touch electrode. This merging eliminates the need for additional touch electrode materials outside the encapsulated layer, reducing material consumption and production costs while maintaining touch functionality
Solution Approach 2:
The cathode layer material is utilized universally for both OLED operation and touch sensing. By making the existing cathode layer material serve multiple purposes, the patent reduces the quantity of additional materials needed, thereby lowering production costs without sacrificing touch performance
3Ease of manufacture
If cathode layers are connected in subpixel groups with driver chip integration, then manufacturing is simplified, but electrical signal management becomes more complex
Solution Approach 1:
The patent segments the cathode layers into subpixel groups (e.g., red, green, blue subpixel groups) where cathode layers within each group are connected together. This segmentation allows for simplified manufacturing by treating each group as a unit while the driver chip manages signals to each group independently, balancing manufacturing simplicity with electrical signal management
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 approach simplifies the manufacturing process and reduces production costs by eliminating the need for independent touch electrode formation outside the encapsulated layer, while maintaining effective touch performance.
Implementation Method 1
determining a touch position according to capacitance variation of the cathode layers in each subpixel group
Data Source
AI summary
A touch display panel, a manufacturing method and a driving method thereof and a touch display device are provided. The touch display panel includes an array substrate, a plurality of subpixels and a driver chip for outputting a signal to cathode layers in each subpixel group. Each subpixel includes an anode layer, a light-emitting layer and a cathode layer; one subpixel group is formed by at least two adjacent subpixels and cathode layers of the subpixels in a same subpixel group are connected. The driver chip is electrically connected with a cathode layer of at least one subpixel in the subpixel group through a conductive wire, and configured to output a common voltage signal to cathode layers in each subpixel group in a display period of one frame and to output a touch drive signal to the cathode layers in each subpixel group in a touch period of one frame.