Touch Sensor Selecting Circuit Wiring Complexity
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Solution Overview
Problem
As display panels enlarge, the number of touch sensors increases, leading to a corresponding increase in the number of integrated circuits and touch lines, which complicates the wiring and reduces efficiency in touch sensing technology.
Innovation Solution
A display device with a selecting circuit that connects internal lines to external lines using switches, allowing for reduced wiring and integrated circuits by employing a self-capacitance method to drive touch sensors, and an auxiliary signal to minimize noise from parasitic capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of touch sensors is increased to support larger display panels, then the coverage area is improved, but the number of integrated circuits and wiring lines increases leading to increased device complexity
Solution Approach 1:
The display panel is divided into multiple regions, with different touch sensor configurations applied to different regions. This allows the system to support large panel areas while managing wiring complexity by segmenting the touch sensing zones rather than uniformly distributing sensors across the entire panel.
Solution Approach 2:
The touch panel is designed to perform multiple functions: it can detect both proximity of external objects and actual touches. By making the touch sensing system multi-functional, the patent reduces the need for separate sensor systems, thereby managing wiring complexity while supporting large display areas.
2Area of stationary object
If the number of touch sensors is increased to support larger display panels, then the coverage area is improved, but the number of integrated circuits increases leading to increased device complexity
Solution Approach 1:
Multiple touch sensor regions are merged into a single integrated touch panel system with unified control. This consolidation allows the system to support large display areas while reducing the number of separate integrated circuits needed, as the merged system shares common control and processing resources.
Solution Approach 2:
The integrated circuits are designed to handle multiple functions: driving display pixels, managing touch sensor signals, and detecting both proximity and touch events. This multi-functionality reduces the number of separate integrated circuits required, thereby supporting large panel areas while managing IC quantity.
3Measurement precision
If more internal lines are connected to external lines to support more touch sensors, then the touch sensing capability is improved, but the wiring complexity increases
Solution Approach 1:
The internal wiring is segmented into regional groups corresponding to different touch sensor zones. This segmentation allows precise touch sensing within each region while reducing overall wiring complexity by organizing connections in structured groups rather than individual point-to-point connections across the entire panel.
Solution Approach 2:
The patent transitions from a planar two-dimensional wiring layout to a three-dimensional stacked architecture where multiple wiring layers are vertically arranged. This dimensional change allows internal lines to be routed through multiple layers, reducing surface wiring complexity while maintaining comprehensive touch sensing capability across the large panel area.
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 configuration reduces the number of touch driving integrated circuits and simplifies wiring, enhancing the efficiency and sensitivity of touch sensing on large-sized panels by minimizing noise and parasitic capacitance effects.
Implementation Method 1
an auxiliary signal to minimize noise from parasitic capacitances
Implementation Method 2
a driving device, connected with the touch sensors through external lines, to drive the touch sensors so as to sense the proximity or a touch of an external object to the panel
Data Source
AI summary
The present disclosure relates to a technology of sensing a touch. According to the present disclosure, touch sensors are driven in a time division way using multiplexers disposed on a panel and auxiliary signals, with a same phase as that of driving signals, are supplied to electrodes around a touch sensor in driving so as to reduce the introduction of noises from the neighboring electrodes.