US 9,285,909 B2 · Equalizing parasitic capacitance effects in touch screens

Abstract

Reduction of the effects of differences in parasitic capacitances in touch screens is provided. A touch screen can include multiple display pixels with stackups that each include a first element and a second element. For example, the first element can be a common electrode, and the second element can be a data line. The display pixels can include a first display pixel including a third element connected to the first element, and the third element can contribute to a first parasitic capacitance between the first and second elements of the first display pixel, for example, by overlapping with the second element. The touch screen can also include a second display pixel lacking the third element. The second display pixel can include a second parasitic capacitance between the first and second elements of the second display pixel. The first and second parasitic capacitances can be substantially equal, for example.

Claims36

Dependent claims

A touch screen comprising:

a plurality of display pixels with stackups that each include a respective common electrode and a respective second element, wherein the plurality of display pixels includes:
a first display pixel including a third element connected to the respective common electrode of the first display pixel, the third element contributing to a first parasitic capacitance between the respective common electrode and the respective second element of the first display pixel, and
a second display pixel lacking the third element and including a fourth element, the fourth element contributing to a second parasitic capacitance between the respective common electrode and the respective second element of the second display pixel such that the first and second parasitic capacitances are substantially equal.

A method of manufacturing a touch screen including a layout of a plurality of display pixels with stackups that each include a respective common electrode and a respective second element, the method comprising:

forming, at a first placement in the layout, a first display pixel including a first configuration that includes the respective common electrode and the respective second element and a third element, the first configuration being associated with a first parasitic capacitance between the respective common electrode and the respective second element of the first display pixel, the third element contributing to the first parasitic capacitance;
and
forming, at a second placement in the layout, a second display pixel including a second configuration that lacks the third element and includes the respective common electrode and the respective second element and a fourth element, the second configuration being associated with a second parasitic capacitance between the respective common electrode and the respective second element of the second display pixel, the fourth element contributing to the second parasitic capacitance such that the first and second parasitic capacitances are substantially equal.

A method of manufacturing a touch screen including a layout of a plurality of display pixels with stackups that each include a respective first element and a respective second element, the method comprising:

forming, at a first placement in the layout, a first display pixel including a first configuration that includes the respective first and second elements and a third element, the first configuration being associated with a first parasitic capacitance, the third element contributing to the first parasitic capacitance;
and
forming, at a second placement in the layout, a second display pixel including a second configuration that lacks the third element and includes the respective first and second elements and a fourth element, the second configuration being associated with a second parasitic capacitance that includes a first portion independent of a second portion,
wherein:
the first portion of the second parasitic capacitance is different from the first parasitic capacitance, and
the fourth element contributes to the second portion of the second parasitic capacitance such that the first and second parasitic capacitances are substantially equal.

3 more elements

Dependencies are inferred from the claim text.

Equalizing parasitic capacitance effects in touch screens

Life of this patent

Equalizing parasitic capacitance effects in touch screens

Life of this patent

Abstract

Claims36