Motorola Corporation

Motorola Mobility LLC

Ken K Foo

John W Kaehler

Zhiming Zhuang

Robert C Rumbaugh

Zhiming (Jim) Zhuang

Kim A Hasler

Pinky Yu

William Paul Alberth, Jr

Roger William Ady

Chenggang Xie

Robert T Smith

Robert D Polak

Patrick A O'Gorman

Sen Yang

Adam K Cybart

David B Murray

Robert J Bero

David M Emig

John A Burroughs

R Dodge D Daverman

An electronic device is operable to determine a touch input applied to a capacitive touch panel system thereof so as to account for time-varying noise affecting the touch panel system. The electronic device includes the touch panel system, an analog-to-digital conversion (ADC) unit, and a processing unit. The processing unit is operable to: receive digital signal values from the ADC unit representing capacitances detected by sensing points of the touch panel system; adjust at least one of the digital signal values based at least on a time-varying noise to produce at least one noise-adjusted value; and determine the touch input based on the at least one noise-adjusted value. In one embodiment, the electronic device determines the time-varying noise prior to adjusting the digital signal values. In another embodiment, the time-varying noise is produced by a display panel of a touchscreen display that also includes the touch panel system.

Electronic device and method for determining a touch input applied to a capacitive touch panel system incorporated therein

Portable devices () that include displays () and are used in widely ranging ambient light conditions use selectable or adjustable optoelectronic input/output compensation functions to drive their displays. According to certain embodiments, a camera () or a light sensor () is used to measure the ambient light level, and an optoelectronic input/output compensation function that is specifically chosen based on the measured ambient light condition is used to drive the display. Furthermore, according to certain embodiments, the optoelectronic input/output compensation function is selected based on whether a display backlight () is turned on or off.

Electronic device with optoelectronic input/output compensation function for a display

A capacitive sensor () for a touch sensitive electronic device () includes at least one graphic () visible to a user. The graphic () is configured so as to be non-electrically interfering with the electrode array of the capacitive sensor (). A substrate (), configured to transmit light, has a layer of capacitive sensor material () deposited thereon. The layer of capacitive sensor material () is electrically conductive and pellucid. A layer of selectively disposed electrically conductive material () is then electrically coupled to the layer of capacitive sensor material (). The layer of selectively disposed electrically conductive material () is arranged as a graphic, which may be a logo, brand, or other mark. The layer of selectively disposed electrically conductive material () has a reflectivity that is greater than the layer of capacitive sensor material () so as to make the graphic () visible to a user.

Electrically non-interfering printing for electronic devices having capacitive touch sensors

Disclosed are circuits and user interfaces of a mobile communication device that include a light source and a shutter that are driven by at least one common voltage line. Also disclosed are circuits and user interfaces of a mobile communication device that include a sensor and a shutter that are driven by at least one common voltage line. Further disclosed are circuits and user interfaces that include a light source, a sensor and a shutter that are driven by at least one common voltage line. The shutter may be divided into a plurality of segments so that one segment may be in optical alignment with a light source and another segment may be in optical alignment with a sensor. A shutter may be part of the same circuit as a light source and/or a sensor without needing its own circuit and driver.

Common circuits and user interfaces for shutters and electro-optical components

Disclosed are methods and devices for color compensation of a display having a translucent display cover applied to an outside surface of the display. A method may include characterizing a color shift due to the translucent display cover for when there is rendering of an image on the display and compensating for the color shift when rendering an image on the display. The method further may include measuring the color shift induced by the color of the finish, and as described below compensating the red, green, and blue (RGB) levels of the display so that the display image may be presented to the user as originally intended. In this way, the image quality may be substantially optimized for viewing regardless of the lens/cover surface color.

Methods and devices for display color compensation

A touchscreen display system () is provided which includes a touchscreen (), a touchscreen input detector (), a capacitive sensor driver (), and a display driver (). The touchscreen input detector () is coupled to a first layer () of the touchscreen () and determines a touchscreen () input in response to sensing tactile inputs during a sensing time interval (). The display driver () is coupled to a second layer () of the touchscreen () and provides a drive voltage () at a first voltage level to the plurality of optical shutter segments () during a first portion () of the sensing time interval () and maintains the drive voltage () at substantially zero volts during a second portion () of the sensing time interval (), the second portion () being greater than half of the sensing time interval ().

Optical shuttered touchscreen and method therefor

Disclosed are devices and methods for intradevice communication in a mobile communication device having a display. A method includes providing a supply signal and superimposing a data signal onto the supply signal. The method further includes driving a light source with the supply signal and the superimposed data signal to produce light to illuminate the display. Also included is sensing the light illuminating the display with an optical sensor, which is coupled to a receiver circuit, and then distinguishing the data signal from the sensed light with the receiver circuit. An image is formed on the display using the data signal distinguished with the receiver circuit.

Devices and methods for intradevice optical communication of data

The preferred embodiments of the present invention provide a system and method for reducing the battery power required by a handheld device () that incorporates a graphical display (). Graphical display (), display drivers (), LCD controller () and a memory () are optimized such that several pixels of information may be clocked simultaneously when the device is operating in a partial display mode. The optimized circuitry reduces the required refresh clock frequency () and thus the current drain on a device battery () thereby improving device operation time.

Reduced power consumption for a graphics accelerator and display

A display device including a plurality of display elements () arranged in a matrix, wherein each display element includes a display pixel () coupled to a switch (), and each display element includes an addressable latch () having an output coupled to a controlling input of the switch. The addressable latch includes a row address input () and a column address input (). In one mode of operation, at least some display elements are activated at a first rate, and other display elements are activated at a second rate less than the first refresh rate by selectively addressing the display elements.

Matrix display having addressable display elements and methods

A field emission display ( ) includes a cathode plate ( ) having a plurality of electron emitters ( ), ballast resistors ( ), an anode plate ( ) having an anode ( ), and a scan mode control circuit ( ). The scan mode control circuit ( ) is coupled to a video control circuit ( ) via a scan mode switching circuit ( ). The scan mode control circuit ( ) cooperates with the scan mode switching circuit ( ) and the video control circuit ( ) to automatically switch between a single scan mode of operation and a multi-scan mode of operation.

Method for extending an operating range of a field emission display and circuit therefor

A method for controlling an emission current ( ) in a field emission display ( ) includes measuring an emission current ( ), measuring a portion of the plurality of pixels receiving emission current ( ) as a percentage of the plurality of pixels on the anode ( ) to define a set point, comparing measured value to set point value and adjusting gate voltage to cause emission current to approach set point value. A field emission display ( ) includes a control circuit ( ), which has an analog-to-digital converter ( ), a current controller ( ), as display timing controller ( ) and a gate voltage source ( ). Analog-to-digital converter ( ) is designed to be connected to power supply ( ). Gate voltage source ( ) is connected to gate extraction electrode ( ) and applies thereto the offset voltage, which is manipulated by current controller ( ) in response to an output signal ( ) of analog-to-digital converter ( ) and an output signal of display timing controller ( ).

Method and circuit for controlling an emission current

A method for controlling spacer (,) visibility in a field emission display (,) includes the steps of modifying pixel data for transmission to a plurality of pixels (,) in a first region (,) adjacent to a spacer (,) to render the spacer (,) invisible to a viewer of the field emission display (,). A field emission display (,) with a spacer visibility correction circuit (,) that modifies pixel data for transmission to a plurality of pixels (,) in a first region (,) adjacent to a spacer (,).

Method for controlling spacer visibility

A method for controlling an emission current (134) in a field emission display (100) includes performing at start-up the steps of providing at an anode (138) a voltage less than an operating anode voltage, receiving emission current (134) at anode (138), concurrently measuring a power output of a power supply (146) connected to anode (138), and using the measured power output to adjust an offset voltage applied to a gate extraction electrode (126). A field emission display (100) includes a control circuit (111), which has a sensor (150), a current controller (154), and a gate voltage source (158). Sensor (150) is designed to be connected to power supply (146). Gate voltage source (158) is connected to gate extraction electrode (126) and applies thereto the offset voltage, which is manipulated by current controller (154) in response to an output signal (152) of sensor (150).

Method and control circuit for controlling an emission current in a

A method for driving a field emission display (100) includes the steps of applying a drive signal (146) to an emission electrode (113) and manipulating the drive signal (146) using a feedback controller to control an electrode voltage signal (158) at the emission electrode (113). A field emission display (100) includes a field emission display device (110), a feedback controller (123), and a current source (120). The current source (120) is connected to an input (144) of the field emission display device (110). An output (131) of the feedback controller (123) is connected to an input (127) of the current source (120), and the input (144) of the field emission display device (110) is connected to the input (129) of the feedback controller (123).

Method for driving a field emission display including feedback control

A field emission display (100) includes a cathode plate (104) having a plurality of electron emitters (112) and ballast resistors (118), an anode plate (120) having an anode (124), and a temperature compensation circuit (130) having an input (142), an output (134), and a current output (138). Input (142) is connected to unregulated voltage (132), output (134) is connected to gate (116), and current output (138) is connected to temperature sensing element (148). Preferably, temperature sensing element (148) is mounted on cathode plate (104) and matches the temperature vs. resistance characteristics of ballast resistors (118). Temperature compensation circuit (130) outputs current (220) to temperature sensing element (148) and receives ballast voltage (230) from temperature sensing element (148) as a function of temperature of cathode plate (104). Temperature compensation circuit (130) outputs gate voltage (238) to adjust electron emission current (114), and subsequently brightness for variations in temperature.

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Gurnee, IL, United States of America

Ken K Foo