OLED Touch Display Panel Integrating Cathode and Self-Capacitance Electrodes
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Solution Overview
Problem
The complex manufacturing processes and higher costs associated with traditional Multi-Layer-On-Cell touch structures in flexible AMOLED displays, particularly due to the need for a multi-layer thin film encapsulation, hinder the development of cost-effective and bendable touch solutions.
Innovation Solution
An OLED touch display panel design featuring a TFT back plate with a cathode layer comprising touch leads and self-capacitance electrodes arranged in a matrix, where the touch leads have consistent resistance values and extend to a non-display region, allowing for a simplified in-cell touch structure without the need for a multi-layer touch structure on the encapsulation cover plate, and utilizing metallic materials for improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Multi-Layer-On-Cell touch structure is used on the encapsulation cover plate, then touch functionality is achieved, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent combines the cathode layer with the touch electrode layer into a single integrated structure. The cathode layer serves dual functions as both the electron injection electrode for OLED operation and the touch sensing electrode, eliminating the need for separate touch structure layers on the encapsulation cover plate. This merging approach directly reduces manufacturing complexity while maintaining touch functionality.
Solution Approach 2:
The cathode layer is designed to perform multiple functions simultaneously: it acts as the negative electrode for OLED light emission and as the self-capacitance touch electrode for touch sensing. This multi-functionality eliminates the need for additional dedicated touch structure components, thereby simplifying the overall device structure and reducing manufacturing steps.
2Ease of manufacture
If traditional Multi-Layer-On-Cell touch structure is implemented, then touch capability is provided, but manufacturing costs increase
Solution Approach 1:
The patent merges the cathode layer and touch electrode layer into one integrated structure, eliminating the need for separate touch structure layers. This reduction in layer count directly decreases material costs, manufacturing steps, and production complexity, thereby lowering overall manufacturing costs while maintaining full touch functionality.
3Ease of manufacture
If touch leads with varying resistance values are used, then manufacturing is simpler, but IR-drop phenomenon increases and display uniformity deteriorates
Solution Approach 1:
The patent applies different width specifications to touch leads in different regions of the display. Touch leads in the center region have different dimensions compared to those at the edges, allowing each region to have optimized resistance characteristics. This local differentiation ensures consistent resistance values across all touch leads, minimizing IR-drop effects and maintaining display uniformity.
Solution Approach 2:
The patent adjusts the physical parameters (width, length) of touch leads to achieve consistent resistance values. By carefully controlling the dimensions of each touch lead based on its position and function, the design ensures uniform electrical characteristics across the entire touch electrode network, thereby reducing IR-drop phenomenon and improving display brightness uniformity.
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 design simplifies the manufacturing process, reduces costs, and enhances the bendability of touch displays by ensuring consistent resistance values in touch leads, thereby improving display and touch performance while minimizing the IR-drop phenomenon and achieving uniform display brightness.
Implementation Method 1
a plurality of self-capacitance electrodes which are insulated from each other and arranged in a form of matrix
Implementation Method 2
Active matrix organic light emitting diode (AMOLED) displays
Data Source
AI summary
An OLED touch display panel and a touch display device are disclosed. The OLED touch display panel includes a TFT back plate and a cathode layer disposed on the TFT back plate. The cathode layer includes a plurality of touch leads which are insulated from each other and a plurality of self-capacitance electrodes which are insulated from each other and arranged in a form of a matrix. The touch leads extend to a non-display region of the OLED touch display panel. Each one of the touch leads is connected with one of the self-capacitance electrodes, and resistance values of the touch leads connected with the self-capacitance electrodes of a same row are all consistent.