Patent Application
20160154505
This relates to touch sensitive devices having touch regions formed in a particular configuration and, more particularly, to touch sensitive device having touch regions formed in a diamond configuration.
Many types of input devices are available for performing operations in a computing system, such as buttons or keys, mice, trackballs, touch sensor panels, joysticks, touch pads, touch screens, and the like. Touch screens, in particular, are becoming increasingly 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) that can be positioned behind the panel so that the touch sensitive surface can substantially cover the viewable area of the display device. Touch screens can generally allow a user to perform various functions by touching or near touching the touch sensor panel using one or more fingers, a stylus or other object at a location dictated by a user interface (UI) including virtual buttons, keys, bars, displays, and other elements, being displayed by the display device. In general, touch screens can recognize a touch event and the position of the touch event on the touch sensor panel, and the computing system can then interpret the touch event in accordance with the display appearing at the time of the touch event, and thereafter can perform one or more actions based on the touch event.
Touch screens that integrate touch circuitry with display circuitry are described in U.S. patent application Ser. No. 11/760,080, entitled “Touch Screen Liquid Crystal Display,” and Ser. No. 12/240,964, entitled “Display with Dual-Function Capacitive Elements,” the contents of which are incorporated herein by reference in their entirety for all purposes. In these touch screens, display pixels can be grouped into drive regions to receive a stimulation signal and sense regions to transmit a touch signal based on a touch or near touch. These regions can generally be disposed in a rectangular configuration with, from left to right, some drive regions aligning vertically, a sense region extending vertically along the lengths of the drive regions, more drive regions aligning vertically, another sense region extending vertically along the lengths of the drive regions, and so on.
Because of this rectangular configuration, horizontal drive lines for transmitting the stimulation signal and vertical sense lines for transmitting the touch signal can cross numerous times in the sense regions, creating parasitic capacitance that can interfere with the ability of the touch screen to effectively sense the touch or near touch. However, to reduce the effects of this parasitic capacitance, more expensive and powerful sensing circuitry may be needed to improve the signal-to-noise ratio of the touch signal.
This relates to a touch sensitive device having touch regions formed in a diamond configuration. Touch regions can include drive regions, which can have drive lines to receive a stimulation signal, and sense regions, which can have sense lines to transmit a touch signal based on a received touch or near touch. The drive regions and the sense regions can include display pixels having capacitive elements for sensing touch. The drive regions and sense regions can be disposed diagonally adjacent to each other to form a diamond configuration for sensing the touch or near touch.
In some embodiments, diagonal drive regions can be separate and unconnected from each other, while diagonal sense regions can be electrically connected to each other via their sense lines. The diagonal sense regions can all be connected in the forward diagonal direction, all in the backward diagonal direction, or some in the forward diagonal direction and others in the backward diagonal direction.
In some embodiments, diagonal drive regions can be electrically connected together via their drive lines and diagonal sense regions can be electrically connected together via their sense lines. The diagonal regions can all be connected in the forward diagonal direction, all in the backward diagonal direction, drive regions in the forward diagonal direction and sense regions in the backward diagonal direction, drive regions in the backward diagonal direction and sense regions in the forward diagonal direction, and any combination thereof.
The diamond configuration can advantageously reduce the parasitic capacitance in the touch sensitive device, e.g., by reducing the number of crossovers in the sense regions between the drive and sense lines. This can result in cost and power savings for the touch sensitive device.
In the following description of various embodiments, reference is made to the accompanying drawings in which it is shown by way of illustration specific embodiments which can be practiced. It is to be understood that other embodiments can be used and structural changes can be made without departing from the scope of the embodiments.
This relates to a touch sensitive device having touch regions disposed in a diamond configuration. Touch regions can include drive regions, which can receive a stimulation signal, and sense regions, which can send a touch signal based on a received touch or near touch. The drive regions and sense regions can be disposed diagonally adjacent to each other to form a diamond configuration. In some embodiments, diagonal drive regions can be separate and unconnected from each other, while diagonal sense regions can be electrically connected to each other via their sense lines. The diagonal sense regions can all be connected in the forward diagonal direction, all in the backward diagonal direction, or some in the forward diagonal direction and others in the backward diagonal direction. In some embodiments, diagonal drive regions can be electrically connected together via their drive lines and diagonal sense regions can be electrically connected together via their sense lines. The diagonal regions can all be connected in the forward diagonal direction, all in the backward diagonal direction, drive regions in the forward diagonal direction and sense regions in the backward diagonal direction, drive regions in the backward diagonal direction and sense regions in the forward diagonal direction, and any combination thereof. The diamond configuration can advantageously reduce the parasitic capacitance in the touch sensitive device by reducing the number of crossovers in the sense regions between the drive and sense lines, which can result in cost and power savings for the touch sensitive device.
A “diamond” configuration can refer to any configuration in which the drive and sense regions are disposed in slant, tilt, angle, oblique, diagonal, or otherwise mainly non-horizontal or non-vertical patterns. Among several regions, a group of the drive regions together, a group of the sense regions together, or a combination of drive and sense regions together so disposed can resemble a diamond shape.
The terms “drive line,” “horizontal common voltage line,” and “xVcom” can refer generally to the conductive lines of the LCD used to transmit a stimulation signal. In most cases, though not always, the term “drive line” can be used when referring to these conductive lines in the drive regions of the LCD because they can be used to transmit a stimulation signal to drive the drive regions.
The terms “sense line,” “vertical common voltage line,” and “yVcom” can refer generally to the conductive lines of the LCD used to transmit a touch signal. In most cases, though not always, the term “sense line” can be used when referring to these conductive lines in the sense regions of the LCD because they can be used to transmit a touch signal to sense the touch or near touch.
The term “subpixel” can refer to a red, green, or blue display component of the LCD, while the term “pixel” can refer to a combination of a red, a green, and a blue subpixel.
Although some embodiments may be described herein in terms of touch screens, it should be understood that embodiments are not so limited, but are generally applicable to any devices utilizing touch and other types of sensing technologies.
In this example, the drive regions 110 in a diagonal can be separate and unconnected from each other. The sense regions 120 in a backward diagonal can be electrically connected to each other via connection 121. The connections will be described in more detail later. These drive and sense region diagonals can form a diamond configuration for the touch sensitive device 100.
In operation, the touch sensitive device 100 can stimulate the drive regions 110 with stimulation signals to form electric field lines between the stimulated drive regions and adjacent sense regions 120. When an object touches or near touches a stimulated drive region 110, the object can affect some of the electric field lines extending to the adjacent sense regions 120, thereby reducing the amount of charge coupled to these adjacent sense regions 120. This reduction in charge can be sensed by the sense regions 120 as an “image” of touch. This touch image can be transmitted along the diagonal sense regions 120, which include the sense region that sensed the touch, via the connections 121 to touch circuitry for further processing. For example, if a touch or near touch happens in the upper left drive region 110, some of the electrical field lines extending to the horizontal neighboring sense region 120 can be affected. The sense region 120 can sense the reduction in charge and transmit the sensed reduction along the diagonal via its connection 121 to the next sense region, which can in turn transmit the sensed reduction to touch circuitry for further processing.
In alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a forward diagonal direction. In other alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a combination of forward and backward diagonal directions.
In some embodiments, one or more of the drive regions in a row can be electrically connected together via their drive lines. Optionally or alternatively, one or more of the drive regions can be electrically connected in their respective diagonals in the forward, backward, or both diagonal directions via their drive lines.
It is to be understood that the configuration of the touch regions in a touch sensitive device is not limited to that shown here, but can include any other suitable diagonal, slant, tilt, angle, oblique, and the like configurations according to various embodiments. It is further to be understood that the touch regions need not form a matrix of rows and columns as shown here, but can form any other suitable layout according to various embodiments. It is also to be understood that the touch regions are not limited to the rectangular shapes and orientations shown here, but can include any other suitable shapes and orientations according to various embodiments.
Touch regions, e.g., drive regions and sense regions, of a touch sensitive device can be formed by groups of pixels electrically connected together. A touch sensitive device can include a touch screen, a touch panel, and the like. For example, touch regions in a touch screen can be formed by groups of pixels having display and touch capabilities, in which the pixels can be used to display graphics or data and to sense a touch or near touch.
Subpixel 202 can include thin film transistor (TFT) 255 with gate 255a, source 255b, and drain 255c. Subpixel 202 can also include storage capacitor, Cst 257, with upper electrode 257a and lower electrode 257b, liquid crystal capacitor, Clc 259, with subpixel electrode 259a and common electrode 259b, and color filter voltage source, Vcf 261. If a subpixel is an in-plane-switching (IPS) device, Vcf can be, for example, a fringe field electrode connected to a common voltage line in parallel with Cst 257. If a subpixel does not utilize IPS, Vcf 251 can be, for example, an indium-tin-oxide (no) layer on the color filter glass. Subpixel 202 can also include a portion 217a of a data line for green (G) color data, Gdata line 217, and portion 213b of gate line 213. Gate 255a can be connected to gate line portion 213b, and source 255b can be connected to Gdata line portion 217a. Upper electrode 257a of Cst 257 can be connected to drain 255c of TFT 255, and lower electrode 257b of Cst 257 can be connected to a portion 221b of a common voltage line that runs in the x-direction, xVcom 221. Subpixel electrode 259a of Clc 259 can be connected to drain 255c of TFT 255, and common electrode 259b of Clc 259 can connected to Vcf 251.
The circuit diagram of subpixel 203 can be identical to that of subpixel 202. However, as shown in
Similar to subpixels 202 and 203, subpixel 201 can include thin film transistor (TFT) 205 with gate 205a, source 205b, and drain 205c. Subpixel 201 can also include storage capacitor, Cst 207, with upper electrode 207a and lower electrode 207b, liquid crystal capacitor, Clc 209, with subpixel electrode 209a and common electrode 209b, and color filter voltage source, Vcf 211. Subpixel 201 can also include a portion 215a of a data line for red (R) color data, Rdata line 215, and a portion 213a of gate line 213. Gate 205a can be connected to gate line portion 213a, and source 205b can be connected to Rdata line portion 215a. Upper electrode 207a of Cst 207 can be connected to drain 205c of TFT 205, and lower electrode 207b of Cst 207 can be connected to a portion 221a of xVcom 221. Subpixel electrode 209a of Clc 209 can be connected to drain 205c of TFT 205, and common electrode 209b of Clc 209 can be connected to Vcf 211.
Unlike subpixels 202 and 203, subpixel 201 can also include a portion 223a of a common voltage line running in the y-direction, yVcom 223. In addition, subpixel 201 can include a connection 227 that connects portion 221a to portion 223a. Thus, connection 227 can connect xVcom 221 and yVcom 223.
Subpixel 204 (only partially shown in
As can be seen in
In general, a display can be configured such that the storage capacitors of all subpixels in the display can be connected together, for example, through at least one vertical common voltage line with connections to horizontal common voltage lines. Another display can be configured such that different groups of subpixels can be connected together to form separate regions of connected-together storage capacitors.
One way to create separate regions can be by forming breaks (opens) in the horizontal and/or vertical common lines. For example, yVcom 225 of device 200 can have break 231, which can allow subpixels above the break to be isolated from subpixels below the break. Likewise, xVcom 221 can have break 233, which can allow subpixels to the right of the break to be isolated from subpixels to the left of the break.
A drive region can be formed by connecting at least one vertical common voltage line yVcom 223, 225 of a pixel with at least one horizontal common voltage line xVcom 221 of the pixel, thereby forming a drive region including a row of pixels. A drive plate (e.g., an ITO plate) can be used to cover the drive region and connect to the vertical and horizontal common voltage lines so as to group the capacitive elements of the pixels together to form the drive region for touch mode. Generally, a drive region can be larger than a single row of pixels in order to effectively receive a touch or near touch on the touch sensitive device. For example, a drive region can be formed by connecting vertical common voltage lines yVcom with horizontal common voltage lines xVcom, thereby forming a drive region including a matrix of pixels. In some embodiments, drive regions proximate to each other can share horizontal common voltage lines xVcom as drive lines, which can transmit stimulation signals that stimulate the drive regions, as previously described. In some embodiments, drive regions proximate to each other can share vertical common voltage lines yVcom with breaks in the lines between the drive regions in order to minimize the lines causing parasitic capacitance that could interfere with the received touch or near touch. Optionally and alternatively, the vertical common voltage line breaks can be omitted and the lines shared in their entirety among the drive regions.
A sense region can be formed by at least one vertical common voltage line yVcom 223, 225 of a pixel, thereby forming a sense region including a column of pixels. A sense plate (e.g., an ITO plate) can be used to cover the sense region and connect to the vertical common voltage line without connecting to a cross-under horizontal common voltage line so as to group the capacitive elements of the pixels together to form the sense region for touch mode. Generally, a sense region can be larger than a single column of pixels in order to effectively sense a received touch or near touch on the touch sensitive device. For example, a sense region can be formed by vertical common voltage lines yVcom, thereby forming a sense region including columns of pixels. In some embodiments, a sense region can use the vertical common voltage lines yVcom as sense lines, which can transmit a touch signal based on a touch or near touch on the touch sensitive device. In the sense region, the vertical common voltage lines yVcom can be unconnected from and cross over the horizontal common voltage lines xVcom to form a mutual capacitance structure for touch sensing. This cross over of yVcom and xVcom can also form additional parasitic capacitance between the sense and drive ITO regions that can be minimized.
It is to be understood that the pixels used to form the touch regions are not limited to those described above, but can be any suitable pixels having touch capabilities according to various embodiments. It is to be further understood that the combinations of the pixels in the touch regions are not limited to those described above, but can include any suitable combinations according to various embodiments.
The drive regions 310 and the sense regions 320 can lie in diagonals to form a diamond configuration. The drive regions 310 in their diagonals can be separate and unconnected from each other, while the drive regions in a row can be electrically connected to each other via the horizontal common voltage lines 301 as drive lines. The sense regions 320 in their diagonals can be electrically connected to each other via connection 321. The connection 321 can be made with the vertical common voltage lines 302 that form the sense regions 320, where the lines can pass through one sense region, veer diagonally in a backward direction to another sense region, pass through that sense region, and so on either to the next sense region or to touch circuitry.
By the sense regions 320 being disposed in the diamond configuration, some of the horizontal common voltage lines 301 can either cross under the connection 321 outside of the sense regions 320 or be eliminated entirely, thereby reducing the parasitic capacitance effects caused by the crossings and/or the sense plate, e.g., an ITO plate, within the sense regions themselves. As a result, more expensive and powerful sensing circuitry need not be used to, in part, address these parasitic capacitance effects in order to effectively sense a touch or near touch. These improved effects can similarly be realized in any of the diamond configurations described below.
In operation, the horizontal common voltage lines 301 can stimulate the drive regions 310 with stimulation signals to form electric field lines between the stimulated drive regions and adjacent sense regions 320. When an object touches or near touches a stimulated drive region 310, the reduction in charge in the adjacent sense region 320 can be sensed and a corresponding signal transmitted along the vertical common voltage lines 302 of that sense region and subsequent sense regions diagonally electrically connected in the backward diagonal direction to the touch circuitry for further processing.
The connection 321 in
In alternate embodiments, the vertical common voltage lines 302 in the sense regions 320 can form a connection between diagonal sense regions in the forward diagonal direction. In other alternate embodiments, the vertical common voltage lines 302 in the drive regions 310 can form a connection between diagonal drive regions in either the forward or the backward diagonal direction.
It is to be understood that the layout of the connections is not limited to that shown, but can include any suitable layout, e.g., any number and configuration of horizontal and vertical common voltage lines, pixels, touch regions, and so on, according to various embodiments.
The drive regions 410 and the sense regions 420 can lie in diagonals to form a diamond configuration. The drive regions 410 in their forward diagonals can be electrically connected to each other via the forward diagonal common voltage lines 401 as drive lines, while the drive regions in a row can be separate and unconnected from each other. The sense regions 420 in their diagonals can be electrically connected to each other via connection 421. The connection 421 can be made with the backward diagonal common voltage lines 402 that form the sense regions 420, where the lines can pass through each sense region in the backward diagonal to the touch circuitry.
In operation, the forward diagonal common voltage lines 401 can stimulate the drive regions 410 with stimulation signals to form electric field lines between the stimulated drive regions and adjacent sense regions 420. When an object touches or near touches a stimulated drive region 410, the reduction in charge in the adjacent sense region 420 can be sensed and a corresponding signal transmitted along the backward diagonal common voltage lines 402 of that sense region and subsequent sense regions diagonally electrically connected in the backward diagonal direction to the touch circuitry for further processing.
In alternate embodiments, the backward diagonal common voltage lines 402 in the sense regions 420 can form a connection between diagonal sense regions in the forward diagonal direction. In other alternate embodiments, the backward diagonal common voltage lines 402 in the drive regions 410 can form a connection between diagonal drive regions in either the forward or the backward diagonal direction. In further alternate embodiments, the forward diagonal common voltage lines 401 in the sense regions 420 that do not connect to a drive region 410 at all can be omitted.
It is to be understood that the layout of the connections is not limited to that shown, but can include any suitable layout, e.g., any number and configuration of horizontal and vertical common voltage lines, pixels, touch regions, and so on, according to various embodiments.
The drive regions 510 and the sense regions 520 can lie in diagonals to form a diamond configuration. The drive regions 510 in their diagonals can be separate and unconnected from each other, while the drive regions in a row can be electrically connected to each other via the horizontal common voltage lines 501 as drive lines. The sense regions 520 in their diagonals can be electrically connected to each other via connection 521. The connection 521 can be made with the backward diagonal common voltage lines 502 that form the sense regions 520, where the lines can pass through the sense regions in the diagonal to touch circuitry.
In operation, the horizontal common voltage lines 501 can stimulate the drive regions 510 with stimulation signals to form electric field lines between the stimulated drive regions and adjacent sense regions 520. When an object touches or near touches a stimulated drive region 510, the adjacent sense region 520 can sense the touch or near touch and transmit a corresponding signal along the backward diagonal common voltage lines 502 of that sense region and subsequent sense regions diagonally electrically connected in the backward diagonal direction to the touch circuitry for further processing.
In alternate embodiments, the backward diagonal common voltage lines 502 in the sense regions 520 can form a connection between diagonal sense regions in the forward diagonal direction. In other alternate embodiments, the backward diagonal common voltage lines 502 in the drive regions 510 can form a connection between diagonal drive regions in either the forward or the backward diagonal direction. In further alternate embodiments, the horizontal common voltage lines 501 can be in a forward or backward diagonal direction and the backward diagonal common voltage lines 502 in a vertical direction.
It is to be understood that the layout of the connections is not limited to that shown, but can include any suitable layout, e.g., any number and configuration of horizontal and vertical common voltage lines, pixels, touch regions, and so on, according to various embodiments.
In alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a forward diagonal direction. In other alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a combination of forward and backward diagonal directions.
In some embodiments, one or more of the drive regions in a row can be electrically connected together via their drive lines. Optionally or alternatively, one or more of the drive regions can be electrically connected in their respective diagonals in the forward, backward, or both diagonal directions via their drive lines.
It is to be understood that the configuration of the touch regions in a touch sensitive device is not limited to that shown here, but can include any other suitable diagonal, slant, oblique, and the like configurations according to various embodiments. It is further to be understood that the touch regions need not form a matrix of rows and columns as shown here, but can form any other suitable layout according to various embodiments. It is also to be understood that the touch regions are not limited to the rectangular shapes and orientations shown here, but can include any other suitable shapes and orientations according to various embodiments.
The drive regions 710 and the sense regions 720 can lie in diagonals to form a diamond configuration. The drive regions 710 in their diagonals can be separate and unconnected from each other, while the drive regions in a row can be electrically connected to each other via the horizontal common voltage lines 701 as drive lines. The sense regions 720 in their diagonals can be electrically connected to each other via connection 721. The connection 721 can be made with the vertical common voltage lines 702 that form the sense regions 720, where the lines can pass through one sense region, veer diagonally in a backward direction to another sense region, pass through that sense region, and so on either to the next sense region or to touch circuitry.
In operation, the horizontal common voltage lines 701 can stimulate the drive regions 710 with stimulation signals to form electric field lines between the stimulated drive regions and adjacent sense regions 720. When an object touches or near touches a stimulated drive region 710, the reduction in charge in the adjacent sense region 720 can be sensed and a corresponding signal transmitted along the vertical common voltage lines 702 of that sense region and subsequent sense regions diagonally electrically connected in the backward diagonal direction to the touch circuitry for further processing.
The connection 721 in
In alternate embodiments, the vertical common voltage lines 702 in the sense regions 720 can form a connection between diagonal sense regions in the forward diagonal direction. In other alternate embodiments, the vertical common voltage lines 702 in the drive regions 710 can form a connection between diagonal drive regions in either the forward or the backward diagonal direction.
Other layouts similar to those of
It is to be understood that the layout of the connections is not limited to that shown, but can include any suitable layout, e.g., any number and configuration of horizontal and vertical common voltage lines, pixels, touch regions, and so on, according to various embodiments.
In alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a backward diagonal direction. In other alternate embodiments, the touch sensitive device can have the sense regions electrically connected in their respective diagonals in a combination of forward and backward diagonal directions.
In some embodiments, one or more of the drive regions in a row can be electrically connected together via their drive lines. Optionally or alternatively, one or more of the drive regions can be electrically connected in their respective diagonals in the forward, backward, or both diagonal directions via their drive lines.
In alternate embodiments, the touch sensitive device can have the sense regions extend in a backward diagonal. In other alternate embodiments, the sense regions can extend in a combination of forward and backward diagonals.
In some embodiments, one or more of the drive regions in a row can be electrically connected together via their drive lines. Optionally or alternatively, one or more of the drive regions can be electrically connected in their respective diagonals in the forward, backward, or both diagonal directions via their drive lines.
Touch screen 1024 (i.e., a touch sensitive device) can include a capacitive sensing medium having drive regions 1029 and sense regions 1027 in a diamond configuration according to various embodiments. The sense regions 1027 can be electrically connected along their respective diagonals with connections 1021. Each drive region 1029 and each sense region 1027 can include capacitive elements, which can be viewed as pixels and which can be particularly useful when touch screen 1024 is viewed as capturing an “image” of touch during touch mode of the touch screen. (In other words, after panel subsystem 1006 has determined whether a touch event has been detected at each touch sensor in the touch screen, the pattern of touch sensors in the multi-touch panel at which a touch event occurred can be viewed as an “image” of touch (e.g. a pattern of fingers touching the panel).) The presence of a finger or other object near or on the touch screen can be detected by measuring changes to a signal charge present at the pixels being touched, which is a function of Csig. Each sense region 1027 of touch screen 1024 can drive sense channel 1008 in panel subsystem 1006. During display mode, the pixels can be used to display graphics or data on touch screen 1024 during display mode.
Computing system 1000 can also include host processor 1028 for receiving outputs from panel processor 1002 and performing actions based on the outputs that can include, but are not limited to, moving one or more objects such as a cursor or pointer, scrolling or panning, adjusting control settings, opening a file or document, viewing a menu, making a selection, executing instructions, operating a peripheral device coupled to the host device, answering a telephone call, placing a telephone call, terminating a telephone call, changing the volume or audio settings, storing information related to telephone communications such as addresses, frequently dialed numbers, received calls, missed calls, logging onto a computer or a computer network, permitting authorized individuals access to restricted areas of the computer or computer network, loading a user profile associated with a user's preferred arrangement of the computer desktop, permitting access to web content, launching a particular program, encrypting or decoding a message, and/or the like. Host processor 1028 can also perform additional functions that may not be related to panel processing, and can be coupled to program storage 1032 and touch screen 1024 such as an LCD for providing a user interface to a user of the device.
Note that one or more of the functions described above can be performed by firmware stored in memory (e.g. one of the peripherals 1004 in
The firmware can also be propagated within any transport medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this document, a “transport medium” can be any medium that can communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The transport readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic or infrared wired or wireless propagation medium.
It is to be understood that the touch screen is not limited to touch, as described in
The mobile telephone, media player, and personal computer of
Although various embodiments have been fully described with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of embodiments as defined by the appended claims.
This application is a continuation of U.S. patent application Ser. No. 12/545,604, filed Aug. 21, 2009, and published on Aug. 5, 2010 as U.S. Patent Publication No. 2010-0194696, which claims benefit of U.S. Provisional Application No. 61/149,270, filed Feb. 2, 2009, the contents of which are incorporated herein by reference in their entirety for all purposes.
| Number | Date | Country | |
|---|---|---|---|
| 61149270 | Feb 2009 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12545604 | Aug 2009 | US |
| Child | 15017463 | US |
