Touch sensor panel including resistors for improved input signal

Abstract

In some examples, a touch screen includes resistors between the touch electrodes and routing traces. In some examples, the resistors can include a transparent conductive material included in the touch electrodes of the touch screen. The resistors can be located in a border region of the touch screen that can surround an active area of the touch screen that can include the touch electrodes and display pixels of the touch screen, for example. In some examples, the resistors included in the touch screen can have different resistances from each other and the same outer dimensions as one another. The resistors can reduce the variation in resistance from channel to channel in the touch screen, which can improve touch screen performance, for example.

Description

FIELD OF THE DISCLOSURE[0001]This relates generally to a touch screen and, more specifically, to a touch screen that includes resistors between the touch electrodes and routing traces.BACKGROUND OF THE DISCLOSURE[0002]Many types of input devices are presently available for performing operations in a computing system, such as buttons or keys, mice, trackballs, joysticks, touch sensor panels, touch screens and the like. Touch screens, in particular, are popular because of their ease and versatility of operation as well as their declining price. Touch screens can include a touch sensor panel, which can be a clear panel with a touch-sensitive surface, and a display device such as a liquid crystal display (LCD), light emitting diode (LED) display or organic light emitting diode (OLED) display that can be positioned partially or fully behind the panel so that the touch-sensitive surface can cover at least a portion of the viewable area of the display device. Touch screens can allow a user...

AI Technical Summary

Benefits of technology

[0005]This relates generally to a touch screen and, more specifically, to a touch screen that includes resistors between the touch electrodes and routing traces. In some examples, routing traces can have different lengths and, therefore, different resistances from one another. Including resistors coupled between the routing traces and touch electrodes can reduce the differences in resistance of each channel, for example. In some examples, reducing the differences in resistance of each channel can improve detecting of an input device. For example, reducing the differences in resistance of each channel can equalize the threshold to which touch data is compared to determine whether the input device is in contact with the touch screen or not and improve the accuracy with which the location of the input device is detected and reduce phantom “wobble” in the detected location of the input device caused by inaccuracies in locating the input device.

Problems solved by technology

For example, variations in resistance of the conductive traces can cause errors in touch sensing that, in turn, can cause errors in locating a proximate object, determining whether a proximate object is touching or hovering over the surface of the touch sensor panel, and / or errors in tracking the movement of an object while it is in contact with the surface of the touch sensor panel.

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