Shielding capacitive touch display

摘要

The ability to effect a change in capacitance is not limited to one side of a capacitive touch element. Objects on an opposite side, or approaching from the opposite side, of a touch element can distort the electrostatic field. In some instances, overall device thickness can be such that the presence of a user's fingers on the back of a portable computing device (e.g., when holding the device) can be sensed by the capacitive touch screen on the front of the device. In various embodiments, a metallic plain, shield, or other conductive layer is provided for devices such as, smartphones, tablet computers, and other computing devices to eliminate, or at least reduce, any potential measurable change in capacitance caused by objects behind the touch panel.

主权项

1. A portable computing device, comprising:
a processor; a memory including instructions that, upon being executed by the processor, enable the processor to cause content to be rendered for display; a device case for holding the processor and the memory, the device case having a first member and a second member separated by a distance from the first member, the second member having a first surface and an opposing second surface; a display element configured to display, wherein the display element is positioned at the first member; a capacitive sensing element configured to detect an object positioned within a detectable distance of the display element, the object being used to provide input to the portable computing device; an electrically conductive element incorporated in the first surface of the second member, the electrically conductive element being connected to a device ground and having at least one of a size or a shape sufficient to prevent objects, that are positioned external to the portable computing device and in proximity to the second surface of the second member, from being detected by the capacitive sensing element.