Researchers Submit Patent Application, "Input Device for and Method of Communication with Capacitive Devices through Frequency Variation", for Approval
The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "Many types of input devices may be used to provide input to computing devices, such as buttons or keys, mice, trackballs, joysticks, touch screens and the like. Touch screens, in particular, are becoming increasingly popular because of their ease and versatility of operation. Typically touch screens can include a touch sensor panel, which may be a clear panel with a touch-sensitive surface, and a display device that can be positioned behind the panel so that the touch-sensitive surface substantially covers the viewable area of the display device. Touch screens allow a user to provide various types of input to the computing device by touching the touch sensor panel using a finger, stylus, or other object at a location dictated by a user interface being displayed by the display device. In general, touch screens receive a touch event and a position of the touch event on the touch sensor panel, and the computing system can then interpret the touch event in accordance with the display appearing at the time of the touch event, and thereafter can perform one or more actions based on the touch event.
"Some capacitive sense touch sensor panels can be formed from a matrix of row and column traces, with capacitive sensing elements or nodes present where the rows and columns cross over each other while being separated by a dielectric material. Each row can be driven by a stimulation signal, and touch locations can be identified through changes in the stimulation signal. Typically, a touch location is sensed based on an interference of the stimulation signal, such that a touch location may correspond to a location where the stimulation signal is the weakest.
"In some instances it may be desirable for input devices, such as styli, to be able to transfer data, in addition to the touch location data, to the touch screen. For example, a stylus may have a finer tip than a user's finger and may be better able to transmit fine characters or symbols (such as those used in handwriting) better than a user's fingers. As another example, data from sensors in the input device may enhance the user experience, with the touch screen, e.g., a sensor may transfer force input parameters to the touch screen to vary an output corresponding to the input device. However, in many instances, the touch screen may have difficultly detecting the input device and/or may not recognize the signal from the input device, and data communication between the touch screen and the input device may be difficult to implement."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "One example of the present disclosure may take the form of a computing device configured to receive data from a peripheral device, such as a stylus. The computing device includes a processor, a touch interface, such as a touch screen, in communication with the processor and configured to detect an input corresponding to an object approaching or contacting a surface. The computing device further includes a touch filter in communication with the touch interface and a peripheral filter in communication with the touch interface. The touch filter is configured to reject a peripheral frequency corresponding to a peripheral signal of the peripheral device and the peripheral filter is configured to reject a touch frequency component corresponding to a touch signal corresponding to a touch input.
"Another example of the disclosure may take the form of a method for receiving digital data through a touch screen. The method may include scanning a plurality of sense lines, filtering a first signal received through one or more of the plurality of sense lines by a touch filter, filtering the first signal by a peripheral filter, and analyzing a touch output from the touch filter and a peripheral output from the peripheral filter to determine whether the first signal is a touch signal or an input device signal.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is a perspective view of a system including a computing device and an input device configured to provide input data to the computing device.
"FIG. 2 is an exemplary block diagram of the input device of FIG. 1.
"FIG. 3 is a simplified cross-section view of a portion of a touch screen of the computing device taken along line 3-3 in FIG. 1.
"FIG. 4 is a simplified block diagram of a sample touch screen or touch interface and associated circuitry.
"FIG. 5 is an enlarged view of a node of the touch screen in communication with the input device.
"FIG. 6 is a flow chart illustrating a method for using a touch screen to receive data from an input device.
"FIG. 7 is a perspective view of a system including a computing device and two input devices configured to provide input data to the computing device.
"FIG. 8 is a schematic of an illustrative implementation of the input devices, the touch screen, and associated circuitry of FIG. 7.
"FIG. 9A is a diagram of a sample sinusoidal waveform encoded by frequency modulation.
"FIG. 9B is a is a diagram of a sample sinusoidal waveform encoded with data by phase shifting."
For additional information on this patent application, see: Shahparnia, Shahrooz. Input Device for and Method of Communication with Capacitive Devices through Frequency Variation. Filed
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