Lattice touch-sensing system

A technology of touch sensing and sensing strips, which is applied in the field of grid-shaped touch sensing systems, and can solve problems such as errors and low signal levels

Inactive Publication Date: 2006-03-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with the former design is that the signal level is very low, the latter design has significant error due to the sparse distribution of the bars

Method used

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Embodiment Construction

[0018] This invention enables a touch sensing system to detect the location of a touch on a touch sensitive surface. The touch sensing system realized by this invention includes a first layer of sensing strips arranged in a first direction, and a second layer of sensing strips arranged in a second direction. The first and second directions may be substantially mutually orthogonal. In this layout, a touch to the touch sensitive surface generates a signal on at least one sensor strip per layer. The location of the touch is then determined by locating the touch on the two sensing strips. The first layer of sensing strips is used to determine the position of the touch along one axis and the second layer of sensing strips is used to determine the position of the touch along the other axis.

[0019] In one embodiment, the invention is implemented in a touch sensitive screen in which a plurality of sensing bars arranged in a lattice structure are embedded in the screen. Each senso...

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Abstract

This invention is directed to a lattice touch-sensing system for detecting a position of a touch on a touch-sensitive surface. The lattice touch-sensing system may include two capacitive sensing layers, separated by an insulating material, where each layer consists of substantially parallel conducting elements, and the conducting elements of the two sensing layers are substantially orthogonal to each other. Each element may comprise a series of diamond shaped patches that are connected together with narrow conductive rectangular strips. Each conducting element of a given sensing layer is electrically connected at one or both ends to a lead line of a corresponding set of lead lines. A control circuit may also be included to provide an excitation signal to both sets of conducting elements through the corresponding sets of lead lines, to receive sensing signals generated by sensor elements when a touch on the surface occurs, and to determine a position of the touch based on the position of the affected bars in each layer.

Description

technical field [0001] This invention relates to a grid-shaped touch sensing system. More specifically, the invention relates to a grid-shaped touch-sensing system having a touch-sensing surface including sensing strips positioned in the grid. Background technique [0002] As computers and other electronic devices become more and more popular, touch sensing systems are becoming more and more popular as a means of inputting data. For example, touch-sensing systems can now be found in workshops, warehouses, manufacturing facilities, restaurants, etc., for handheld personal digital assistants, automated teller machines, casino gaming machines, and the like. [0003] Capacitive touch sensing is one of the most widely used technologies in the touchscreen industry. Capacitive touch sensors are mainly divided into two categories, namely continuous capacitive sensors and discontinuous (dot matrix) capacitive sensors. In continuous capacitive sensors, the sensor consists of a thin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/033H03K17/96G06F3/044
CPCH03K17/9622H03K2217/960755G06F3/044G06F3/0445G06F3/0446
Inventor R·C·姆里根B·马苏德A·K·翁B·G·里姆
Owner 3M INNOVATIVE PROPERTIES CO
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