Multiplexing Common Electrodes for OLED Touch Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display devices with direct on cell touch (DOT) designs suffer from poor display and touch effects due to large parasitic capacitances between touch electrodes and cathodes, leading to increased thickness and complexity in the manufacturing process.
Innovation Solution
A display panel design featuring a substrate with a driving circuit layer, a light-emitting layer, and a common electrode layer where multiplexing electrodes are formed on the common electrode layer, perpendicular to touch electrodes, eliminating the need for an additional touch metal layer and reducing parasitic capacitance by using common electrodes as touch electrodes, thereby improving display and touch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If double-layer metal is adopted for touch electrodes, then touch function is achieved, but light transmittance deteriorates and display effect worsens
Solution Approach 1:
The patent merges the common electrode and touch electrode into a single integrated structure. The common electrode layer serves dual functions as both the cathode for light emission and the touch sensing electrode, eliminating the need for separate touch electrode layers. This consolidation maintains touch functionality while improving light transmittance by removing additional metal layers that would block light.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: it acts as the cathode for electroluminescence and as the touch sensing electrode. By making the common electrode universal, the patent eliminates the need for separate touch electrode structures, thereby improving light transmittance without sacrificing touch functionality.
2Measurement precision
If separate touch electrode layer is added, then touch sensitivity is improved, but panel thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the common electrode and touch electrode into a single integrated layer structure. The common electrode layer is configured to perform both cathode functionality and touch sensing, eliminating the need for additional separate touch electrode layers. This integration maintains touch sensitivity while reducing overall panel thickness.
3Ease of operation
If traditional DOT design with separate touch and common electrodes is used, then touch function is achieved, but parasitic capacitance increases resulting in poor touch effect
Solution Approach 1:
The patent merges the common electrode and touch electrode into a single integrated structure where the common electrode layer serves as both the cathode and touch sensing electrode. This integration eliminates the parasitic capacitance that arises from the proximity of separate touch and common electrode layers, thereby improving touch response and reducing false touches.
4Ease of operation
If additional touch metal layer is formed, then touch electrode functionality is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the formation of common electrode and touch electrode into a single manufacturing process step. The common electrode layer is deposited and patterned to serve dual purposes, eliminating the need for separate deposition and patterning steps for touch electrodes. This integration significantly simplifies the manufacturing process while maintaining full touch functionality.
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a display device, the display panel forms multiplexing electrodes on a common electrode layer, and the multiplexing electrodes can transmit a common signal and a touch signal, a function of the common electrodes and a touch function are realized, parasitic capacitances between the touch electrodes and the common electrodes are eliminated, and the display effect and the touch effect are improved, and by using the power management chip to connect to the multiplexing electrodes, the signal input to the multiplexing electrode can be realized, and a function of the multiplexing electrodes can be realized.