Touch Display Panel with Hollow Symmetrical Electrodes
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Solution Overview
Problem
The manufacturing process for mutual-capacitive touch control layers in touch display panels is complex and costly, requiring four mask processes, which hinders yield improvement and cost savings.
Innovation Solution
A touch display panel utilizing self-capacitive touch control with a touch control layer featuring hollow, symmetrical touch electrode blocks and electrode lines formed using a single metal layer, simplifying the manufacturing process and reducing the number of required mask processes to two.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual-capacitive touch control layer is used, then touch control function is achieved, but manufacturing process complexity increases and cost increases
Solution Approach 1:
The patent combines the driving electrode and sensing electrode into a single electrode layer, eliminating the need for separate metal layers. This merging of functions into one layer reduces the number of mask processes from four to two, directly addressing the manufacturing complexity issue while maintaining touch control functionality
Solution Approach 2:
The single electrode layer serves dual purposes as both driving and sensing electrode, making it a multi-functional component. This universal electrode structure performs multiple functions (signal transmission, touch sensing, and driving) that previously required separate dedicated layers, thereby simplifying the manufacturing process
2Reliability
If mutual-capacitive touch control layer is used, then touch control function is achieved, but manufacturing cost increases
Solution Approach 1:
By merging the driving and sensing electrodes into a single electrode layer formed by one mask process, the patent eliminates redundant manufacturing steps. This consolidation directly reduces material waste, processing time, and equipment usage, leading to lower manufacturing costs while preserving touch control functionality
Solution Approach 2:
The patent extracts and eliminates the unnecessary second metal layer and associated mask processes from the manufacturing sequence. By removing these redundant components and steps, the manufacturing cost is reduced without compromising the essential touch control function
3Measurement precision
If hollow structure is added to touch electrode blocks, then touch sensitivity improves, but device complexity increases
Solution Approach 1:
The patent introduces hollow structures within the touch electrode blocks, creating a porous or cavity-containing architecture. This hollow design increases the effective surface area and capacitance of the electrode, enhancing touch sensitivity while the hollow spaces can be formed through simple etching processes that add minimal complexity to the manufacturing
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, reduces costs, and enhances touch sensitivity by using a single metal layer for signal input and output, while maintaining high sensitivity through symmetrical electrode designs.
Implementation Method 1
utilize the principle of self-capacitive touch control to realize a touch control function with high sensitivity
Data Source
AI summary
Disclosed are a touch display panel and a display device. The touch display panel includes an array substrate, a light-emitting functional layer, an encapsulating layer and a touch control layer that are sequentially disposed. The touch control layer includes a plurality of touch electrode blocks arranged in an array and further includes a plurality of electrode lines connected to the plurality of touch electrode blocks in one-to-one correspondence. Each touch electrode block is provided with a hollow structure, and each touch electrode blocks is symmetrical at least with respect to a first axis and a second axis that are perpendicular to each other.