Touch Display Panel Demultiplexing Circuit Layout
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Solution Overview
Problem
Conventional self-capacitive touch display panels face limitations due to a large number of touch channel signal lines, which restricts layout design space and the selection of driving chips, especially as the size of the touch area increases.
Innovation Solution
A touch display panel design that includes a plurality of touch electrodes, touch signal lines, demultiplexing circuits, touch channel signal lines, pads, and a driving chip, where demultiplexing circuits selectively connect touch signal lines to touch channel signal lines, reducing the number of touch channel signal lines and pads required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If self-capacitive DOT technology is used with one touch electrode corresponding to one touch signal line, then touch detection coverage is improved, but the number of touch channel signal lines increases significantly
Solution Approach 1:
The patent divides the touch signal lines into multiple groups, with each group connected to a separate demultiplexing circuit. The demultiplexing circuits are arranged in multiple columns, and each column processes a subset of touch signal lines. This segmentation allows the system to handle a large number of touch electrodes while reducing the number of channel signal lines needed to connect to the driving chip.
Solution Approach 2:
The patent introduces demultiplexing circuits as intermediary components between the touch signal lines and the driving chip. These demultiplexing circuits act as mediators that selectively connect multiple touch signal lines to a smaller number of channel signal lines, thereby reducing the overall complexity of the signal transmission path.
2Area of stationary object
If the number of touch signal lines increases, then touch electrode coverage is improved, but the layout design space is restricted
Solution Approach 1:
The patent segments the demultiplexing circuits into multiple columns distributed across the touch panel. This columnar arrangement allows for more flexible layout design, as the circuits can be organized in a structured grid pattern that optimizes space utilization while maintaining design freedom.
Solution Approach 2:
The patent utilizes the columnar dimension to organize demultiplexing circuits, transforming the layout problem from a two-dimensional constraint into a three-dimensional arrangement. By distributing circuits across multiple columns and layers, the design achieves better space efficiency and layout flexibility.
3Reliability
If more touch channel signal lines are used, then touch signal transmission is improved, but the selection of driving chips is limited
Solution Approach 1:
The demultiplexing circuits serve as intermediary devices that bridge the gap between the numerous touch signal lines and the limited channel signal lines of the driving chip. This intermediary structure allows the system to maintain reliable touch signal transmission while being compatible with driving chips that have fewer input channels.
Solution Approach 2:
The patent changes the architectural parameters of the touch signal transmission system by introducing demultiplexing stages. This parameter change transforms the direct one-to-one connection model into a many-to-few connection model, expanding the range of compatible driving chips while maintaining signal integrity.
Data Source
AI summary
A touch display panel and a display device are provided. The touch display panel includes: a plurality of touch electrodes, a plurality of touch signal lines, a plurality of demultiplexing circuits, a plurality of touch channel signal lines, a plurality of pads, and a driving chip. The demultiplexing circuits can selectively electrically connect one of multiple of the touch signal lines to a corresponding one of the touch channel signal lines. A number of the pads can be decreased, and layout design space required by the touch channel signal lines and the pads can be reduced, so as to increase freedom of selection of the driving chip.