Layers of a touch sensor array used by electronic devices may be incorporated into other components, such that a touch sensor array is formed upon assembly of the other components. This touch sensor array may then be used as an input device by a user. For example, one layer of a touch sensor array may be integrated into the back of a display component, forming a first integrated package. Similarly, a second layer of the touch sensor array may be integrated into the front of a battery, forming a second integrated package. Upon assembly of the display atop the battery, the touch sensor array is formed. Such integration results in simpler and less expensive assembly, reduces the count of discrete parts during assembly, and minimizes the electronic device's physical profile.