Touch Structure Reducing Readout Lines and Ghosting
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Solution Overview
Problem
Self-capacitance touch screens suffer from ghosting issues and require a large number of touch signal readout lines, limiting their development and application, especially in multi-touch scenarios.
Innovation Solution
A touch structure comprising a plurality of touch units, touch row selection lines, and touch column readout lines, where each touch unit includes a first transistor, a touch metal block, and a second transistor, allowing for reduced touch signal readout lines and avoidance of ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If self-capacitance touch screen uses traditional reading methods, then touch accuracy is high, but multi-touch capability is limited due to ghosting
Solution Approach 1:
The touch screen is divided into multiple touch units arranged in an array, with each unit independently controllable through row selection lines and column readout lines. This segmentation allows selective reading of specific rows, eliminating ghosting effects while maintaining touch accuracy and enabling multi-touch capability.
2Measurement precision
If self-capacitance touch screen uses traditional reading methods, then touch accuracy is high, but number of touch signal readout lines required is large
Solution Approach 1:
The touch units are segmented into rows and columns with shared readout lines. Each column shares a common readout line, reducing the total number of readout lines from M×N to N, while maintaining touch accuracy through selective row activation.
Solution Approach 2:
The column readout lines serve multiple functions: they act as both readout lines for multiple touch units and as signal collection paths. Each column readout line collects signals from multiple touch units in different rows, reducing the overall number of lines required.
3Adaptability or versatility
If mutual-capacitance touch screen is used, then multi-touch capability is improved, but touch accuracy is lower than self-capacitance
Solution Approach 1:
Each touch unit contains its own transistor that automatically selects and routes touch signals based on row activation. The touch units self-manage signal routing without requiring complex external control, achieving both high accuracy and multi-touch capability.
Data Source
AI summary
A touch structure and a touch display panel are disclosed. The touch structure includes a plurality of touch units, a plurality of touch row selection lines, and a plurality of touch column readout lines. One of the touch column readout lines is configured using one column of the touch units, and required touch signals can be read out using only N touch column readout lines. In addition, one of the touch row selection lines is electrically connected to one row of the touch units. Therefore, the required touch signals may be read row by row, thereby avoiding the ghosting.