Capacitive Touch Panel Zone Segmentation Reduces IC Terminals
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Solution Overview
Problem
Capacitive touch panels face limitations when the number of x and y coordinates exceeds the channel capacity of standard integrated circuits, requiring multiple ICs for monitoring, which increases complexity and cost.
Innovation Solution
The touch sensing unit is divided into multiple zones with zone sensing elements and edge-bridge lines connecting sensing elements in series, reducing the number of terminals needed by allowing each zone to be connected to a single IC channel, thereby reducing the number of ICs required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of x and y coordinates is increased to expand the touch sensing area, then the touch sensing area is improved, but the channel capacity of standard integrated circuits is exceeded, requiring multiple ICs which increases device complexity
Solution Approach 1:
The touch sensing unit is divided into multiple zones (first touch zone, second touch zone, third touch zone, fourth touch zone) with dedicated zone sensing elements for each zone. This segmentation allows the large touch sensing area to be monitored using fewer IC channels by grouping coordinates into zones, thereby reducing the number of ICs required while maintaining accurate coordinate determination across the expanded touch sensing area
2Area of stationary object
If multiple ICs are used to monitor touch events across a large touch sensing area, then the touch sensing area is improved, but the system complexity and cost increase
Solution Approach 1:
The touch sensing unit is divided into multiple zones (first touch zone, second touch zone, third touch zone, fourth touch zone) with dedicated zone sensing elements for each zone. This segmentation allows the large touch sensing area to be monitored using fewer IC channels by grouping coordinates into zones, thereby reducing the number of ICs required while maintaining accurate coordinate determination across the expanded touch sensing area
Solution Approach 2:
Zone sensing elements are introduced as intermediary components between the touch sensing unit and the integrated circuits. These zone sensing elements aggregate touch coordinate information from multiple zones and interface with a reduced number of IC channels, acting as mediators that reduce the complexity of direct connections between numerous touch coordinates and multiple ICs
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 allows for efficient touch event monitoring with fewer ICs, reducing complexity and cost while maintaining accurate coordinate determination across a larger touch sensing area.
Implementation Method 1
capacitive touch panels face limitations when the number of x and y coordinates exceeds the channel capacity
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(d)
AI summary
In a capacitive touch panel having touch cells arranged in a two-dimensional array and defined by two coordinates, the present invention provides a third coordinate. In particular, the touch cells in a row are electrically connected to a first sensing element and the touch cells in a column are electrically connected in a second sensing element. The first sensing elements can be arranged into two or more touch zones. Each of the touch zones has a zone sensing element for defining the zone coordinate. Some of the first sensing elements in one touch zone are electrically connected to the corresponding first sensing elements in the other touch zones in series. As such, the number of terminals connected to the first sensing elements can be reduced.