US 2013/0076648 A1 · POWER MANAGEMENT FOR INTEGRATED TOUCH SCREENS

Abstract

Reducing or eliminating the effects of noise that can be generated by a power system of a touch screen device, such as a gate line voltage system that applies voltage to gate lines of the touch screen, is provided. In one example, a power supply, such as a charge pump, can be disabled during active touch sensing, such that noise from the charge pump is not generated during touch sensing. In some examples, a voltage regulator can help to maintain the gate voltage level at or above a desired threshold. In some cases, noise entering the touch sensing system can have a lasting effect on noise-sensitive components, even after the noise source is disabled. In these cases, a post-noise stabilizing system can be included to stabilize, reset, etc., noise-sensitive components of the touch sensing system, which can help to reduce or eliminate the lasting effect of noise.

Claims21

Dependent claims

An integrated touch screen system comprising:

a touch screen including a plurality of display pixels, the plurality of display pixels including an addressing system that includes a plurality of conductive lines;
a display system that updates an image displayed by the display pixels during a display phase, wherein the updating of the image includes actively operating a power supply to apply voltages to the conductive lines to address the display pixels;
and
a touch sensing system that senses touch during a touch sensing phase, the touch sensing phase including a plurality of active sensing periods during which the touch sensing system performs active touch sensing while the power supply is inactive, the touch sensing phase further including at least one gap period between active sensing periods, wherein the power supply is actively operated to apply voltages to the conductive lines during the at least one gap period while active touch sensing is not being performed.

1 more element

A method of managing power in a touch screen system that includes a touch screen including a plurality of display pixels, the plurality of display pixels including an addressing system that includes a plurality of conductive lines, the method comprising:

updating an image displayed by the display pixels during a display phase, wherein the updating of the image includes actively operating a power supply to apply voltages to the conductive lines to address the display pixels;
and
sensing touch during a touch sensing phase, the touch sensing phase including a plurality of active sensing periods during which the touch sensing system performs active touch sensing while the power supply is inactive, the touch sensing phase further including at least one gap period between active sensing periods, wherein the power supply is actively operated to apply voltages to the conductive lines during the at least one gap period while active touch sensing is not being performed.

Dependencies are inferred from the claim text.

Power management for integrated touch screens

Life of this patent

Power management for integrated touch screens

Life of this patent

Abstract

Claims21