Embedded Touch Display Matrix Reduces Lead Wire Count
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Solution Overview
Problem
Conventional embedded self-capacitive touch display screens require numerous touch electrodes and corresponding bonding pins for high detection precision, making them unsuitable for mass production due to increased complexity and reduced production efficiency.
Innovation Solution
An embedded display screen design where a common electrode is divided into sub-electrodes arranged as a matrix, with a driving selector connected to each sub-electrode through multiple lead wires, and a touch controller connected via fewer selection and scanning signal lines, reducing the number of lead wires needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more touch electrodes are disposed to improve detection precision, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The common electrode is divided into multiple sub-electrodes arranged in a matrix pattern, allowing the touch detection function to be distributed across multiple segments. This segmentation enables precise touch detection while using a manageable number of bonding pins by grouping electrodes into rows and columns that can be scanned sequentially.
Solution Approach 2:
The patent implements periodic scanning of the touch electrodes through row and column selection signals. Instead of requiring all electrodes to be connected simultaneously, the system periodically activates specific rows and columns in a scanning manner, reducing the number of bonding pins needed while maintaining detection precision across the entire electrode array.
2Measurement precision
If more touch electrodes are disposed to improve detection precision, then measurement precision is improved, but productivity decreases
Solution Approach 1:
By segmenting the electrode array into rows and columns with shared bonding pins, the patent reduces the total number of bonding connections required. This segmentation allows for simpler bonding processes and faster assembly, thereby improving productivity while maintaining the ability to detect touches with high precision across the entire screen surface.
Solution Approach 2:
The bonding pins serve multiple functions: they connect to multiple sub-electrodes simultaneously through the matrix arrangement, enabling both row and column scanning operations. This multi-functionality reduces the number of bonding pins needed compared to a one-to-one connection scheme, simplifying the bonding process and improving production efficiency.
3Measurement precision
If more lead wires are used to connect each touch electrode to the touch controller, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent transitions from a one-dimensional linear arrangement of electrodes to a two-dimensional matrix arrangement. This dimensional change allows lead wires to intersect and share connections at different dimensions, reducing the total number of lead wires needed while maintaining comprehensive touch detection capability across the electrode array.
Solution Approach 2:
The common electrode serves as an intermediary structure that is divided into sub-electrodes arranged in a matrix. This intermediary arrangement allows multiple sub-electrodes to share common connections through the matrix structure, reducing the number of lead wires required compared to direct one-to-one connections between individual touch electrodes and the controller.
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 reduces the number of lead wires required, enhancing production efficiency and enabling higher detection precision while maintaining the thin and lightweight characteristics of embedded touch display screens.
Implementation Method 1
Through detecting a capacitance formed between a touch electrode and a touch object to determine a touch event
Data Source
AI summary
An embedded display screen and a terminal device having touch detection function, and a touch detection method are disclosed. The touch screen includes an upper substrate, a lower substrate, a liquid crystal display layer, and a common electrode. The common electrode is divided into multiple sub-electrodes arranged as a matrix to form a touch detection electrode. The driving selector is correspondingly connected with the multiple sub-electrodes one by one through multiple lead wires. The touch controller is disposed outside the upper substrate and the lower substrate, and is connected with the driving selector through selection signal line and scanning signal line. A total number of the selection signal line and the scanning signal line is less than a total number of the lead wires. The touch controller sends a selection signal to the driving selector through the selection signal line. Accordingly, the number of the lead wires is reduced.