OLED Panel Time-Division Touch Electrode Multiplexing
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Solution Overview
Problem
Existing OLED panels face challenges with the On cell touch structure due to the shielding effect of the cathode layer, which affects the product thickness and increases costs, as they require a flexible printed circuit and a specific touch control scheme.
Innovation Solution
The OLED panel incorporates a time-division drive module that multiplexes anodes to alternately form common electrodes or touch electrodes, allowing for touch recognition without additional touch electrodes, by configuring cathodes to pass through the organic light emitting layer and be electrically connected to TFTs, enabling self-capacitive or mutual-capacitive touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the On cell touch structure is adopted due to the shielding effect of the cathode layer, then touch recognition can be achieved, but the product thickness increases and costs increase due to requiring flexible printed circuit and additional touch electrodes
Solution Approach 1:
The patent merges the common electrode and touch electrode functions into a single electrode structure. The common electrode serves dual purposes: as the cathode for OLED operation and as the touch detection electrode. This eliminates the need for separate touch electrodes and flexible printed circuits, thereby reducing product thickness while maintaining touch recognition capability.
Solution Approach 2:
The cathode layer is designed to perform multiple functions simultaneously: it serves as the common electrode for OLED operation and as the touch electrode for touch recognition. This multi-functionality eliminates the need for additional dedicated touch electrodes and reduces the overall structure complexity, addressing both the thickness and cost issues.
2Reliability
If the On cell touch structure is adopted due to the shielding effect of the cathode layer, then touch recognition can be achieved, but production costs increase due to requiring flexible printed circuit and additional touch electrodes
Solution Approach 1:
The patent merges the common electrode and touch electrode functions into a single electrode structure. The common electrode serves dual purposes: as the cathode for OLED operation and as the touch detection electrode. This eliminates the need for separate touch electrodes and flexible printed circuits, thereby reducing product thickness while maintaining touch recognition capability.
Solution Approach 2:
The cathode layer is designed to perform multiple functions simultaneously: it serves as the common electrode for OLED operation and as the touch electrode for touch recognition. This multi-functionality eliminates the need for additional dedicated touch electrodes and reduces the overall structure complexity, addressing both the thickness and cost issues.
3Reliability
If separate touch electrodes are added on the cover plate, then touch recognition capability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent merges the common electrode and touch electrode functions into a single electrode structure. The common electrode serves dual purposes: as the cathode for OLED operation and as the touch detection electrode. This eliminates the need for separate touch electrodes and flexible printed circuits, thereby reducing product thickness while maintaining touch recognition capability.
Solution Approach 2:
The cathode layer is designed to perform multiple functions simultaneously: it serves as the common electrode for OLED operation and as the touch electrode for touch recognition. This multi-functionality eliminates the need for additional dedicated touch electrodes and reduces the overall structure complexity, addressing both the thickness and cost issues.
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 solution reduces the thickness of the OLED panel and lowers production costs by eliminating the need for extra touch electrodes, while maintaining effective touch recognition and image display capabilities.
Implementation Method 1
a touch recognition module 10 configured to recognize a touch by detecting a capacitance change of the touch electrodes
Data Source
AI summary
An OLED panel is provided. The OLED panel may include multiple matrix-arranged TFTs, an anode layer, an organic light emitting layer, a cathode layer, and/or any other components. The anode layer can have multiple anodes, formed on one side of the TFTs. The organic light emitting layer can be formed on one side of the anode layer away from the TFTs. The cathode layer can have multiple cathodes and be formed on one side of the organic light emitting layer away from the anode layer. The cathodes can pass through the organic light emitting layer and be electrically connected to the corresponding TFTs to form pixel electrodes. A time-division drive module can be electrically connected to the anodes, which can be configured to multiplex time-divisionally to alternately form common electrodes or touch electrodes.