Mutually Inductive Touch Circuit for Multi-Point Detection
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Solution Overview
Problem
Current inductive touch screens face challenges in achieving high touch point detection precision while enabling multi-point touch functionality, as existing designs either occupy excessive space for wiring or are limited in the number of inductive units, leading to low detection precision and misjudgment during multi-point touches.
Innovation Solution
A touch point detecting circuit with a plurality of mutually inductive units arranged in an array, where each unit includes a first and second coil connected to shared signal lines, allowing for increased density and precision in touch point detection, enabling accurate multi-point touch recognition by utilizing mutual inductance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If each inductive unit is connected to an identical input connecting terminal through an input signal line, then the wiring structure is simple, but the space occupied by inductive units is reduced and the quantity of inductive units is limited, leading to low detection precision
Solution Approach 1:
The patent divides the signal lines into different types (first signal lines for input, second signal lines for output) and assigns them to different rows and columns of inductive units. This segmentation allows each inductive unit to have unique identification through its position in the matrix, increasing the number of detectable units without complicating the overall wiring structure.
Solution Approach 2:
The patent transitions from a one-dimensional connection structure (each unit connected to identical terminal) to a two-dimensional matrix structure where inductive units are arranged in rows and columns with dedicated signal lines for each dimension. This dimensional expansion allows significantly more inductive units to be accommodated within the same space, thereby improving detection precision.
2Device complexity
If inductive units of the same row are jointly connected to a row detecting circuit and units of the same column are jointly connected to a column detecting circuit, then the space occupied for wiring is reduced and the quantity of inductive units is increased, but the system can only detect single-point touch and produces misjudgment under multi-point touch conditions
Solution Approach 1:
The patent introduces separate output signal lines for each inductive unit that feed back to the control unit. This feedback mechanism allows the system to receive individual responses from each inductive unit, enabling the control unit to distinguish between multiple touch points and accurately determine their positions, thus achieving multi-point touch detection capability.
Solution Approach 2:
The patent creates a matrix of inductive units where each unit can be independently addressed through its row and column signal lines. This copying of the inductive unit structure across the matrix allows the system to detect multiple touch points simultaneously by activating and reading from different units without interference, overcoming the limitation of single-point touch detection.
3Measurement precision
If the quantity of inductive units is increased to improve detection precision, then the position coordinates on the touch screen are increased, but the space occupied by inductive units increases which limits the available area for other components
Solution Approach 1:
The patent merges the signal transmission and detection functions into a unified matrix structure where row and column signal lines are integrated with the inductive units. This merging allows multiple inductive units to share common signal lines, reducing the total wiring space required while maintaining the ability to address each unit individually for high-precision detection.
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 solution reduces wiring space, increases the number of inductive units, and enhances detection precision, allowing for accurate multi-point touch recognition by utilizing mutual inductance changes, thereby improving the overall touch point detection capabilities.
Implementation Method 1
each mutually inductive unit includes a first coil and a second coil which are mutually coupled inductors
Data Source
AI summary
A touch point detecting circuit, an inductive touch screen and a touch display device are disclosed. The touch point detecting circuit includes a plurality of mutually inductive units arranged in an array, wherein each mutually inductive unit includes a first coil and a second coil which are mutually coupled inductors, the first coil of each mutually inductive unit in a same row is electrically connected to an identical first signal line, and the second coil of each mutually inductive unit in a same column is electrically connected to an identical second signal line. By adopting the touch point detecting circuit provided in the technical solution, not only may the detection precision be relatively high, but also the positions of touch points may be determined by detecting the mutual inductance change of each mutually inductive unit, so that multi-point touch is realized.