AMOLED Touch Layer Mesh Conductive Structure
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Solution Overview
Problem
The fabrication of touch layers on active-matrix organic light emitting diode (AMOLED) panels is complex and costly, limiting their widespread adoption in consumer and wearable devices due to high production costs and intricate processes.
Innovation Solution
A display module with a touch layer integrated on the light emitting side of the display substrate, featuring a mesh conductive structure and transparent electrodes that generate self-capacitance for touch detection, reducing the need for separate driving and sensing electrodes and simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional touch layer structure with separate driving and sensing electrodes is used, then touch detection functionality is achieved, but the fabrication process becomes complex and production cost increases
Solution Approach 1:
The patent combines the driving electrode and sensing electrode into a single transparent electrode layer. The transparent electrode serves dual functions: as a driving electrode for OLED operation and as a sensing electrode for touch detection. This merging eliminates the need for separate electrode structures and reduces fabrication process complexity while maintaining touch detection functionality.
Solution Approach 2:
The transparent electrode is designed to perform multiple functions simultaneously. It acts as both the driving electrode for the OLED display and the sensing electrode for the touch sensor. This multi-functionality reduces the number of required components and simplifies the overall device structure without compromising touch detection capability.
2Reliability
If a traditional touch layer structure with separate driving and sensing electrodes is used, then touch detection functionality is achieved, but production cost increases
Solution Approach 1:
The patent combines the driving electrode and sensing electrode into a single transparent electrode layer. The transparent electrode serves dual functions: as a driving electrode for OLED operation and as a sensing electrode for touch detection. This merging eliminates the need for separate electrode structures and reduces fabrication process complexity while maintaining touch detection functionality.
Solution Approach 2:
The transparent electrode is designed to perform multiple functions simultaneously. It acts as both the driving electrode for the OLED display and the sensing electrode for the touch sensor. This multi-functionality reduces the number of required components and simplifies the overall device structure without compromising touch detection capability.
3Reliability
If transparent electrodes are placed over light emitting units, then touch detection sensitivity is improved, but display quality deteriorates due to light blocking
Solution Approach 1:
The patent divides the touch sensor structure into distinct regions: transparent electrodes are placed only in the non-light-emitting areas (between light emitting units), while the light emitting units remain uncovered. This segmentation allows touch detection functionality in non-display areas without interfering with the light output and display quality of the active pixel regions.
Solution Approach 2:
The transparent electrode structure is selectively applied to different regions of the display. In the light emitting units, no transparent electrode is placed to maintain display quality. In the non-light-emitting areas, transparent electrodes are placed to provide touch detection sensitivity. This local differentiation optimizes both display performance and touch detection capability in their respective regions.
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 enables efficient and cost-effective touch detection with a simpler structure, improving the production efficiency and reducing the complexity of the fabrication process while maintaining high display quality and touch sensitivity.
Implementation Method 1
featuring a mesh conductive structure and transparent electrodes that generate self-capacitance for touch detection
Data Source
AI summary
The present disclosure provides a display module, a method for fabricating the display module and a display device. The display module includes a display substrate and a touch layer on a light emitting side of the display substrate, the display substrate includes a plurality of light emitting units, the touch layer includes a plurality of touch units in the touch area, and an orthographic projection of each of the plurality of touch units on the display substrate covers at least two light emitting units. Each touch unit includes: a mesh conductive structure including conductive wires arranged crosswise to define a plurality of grids, an orthographic projection of each conductive wire on the display substrate is in a space between adjacent light emitting units; and a plurality of first transparent electrodes, each of which is in the grid and electrically coupled to the conductive wire.