PATENT DOCUMENT

Publication Number: US-8760412-B2
Application Number: US-54555709-A
Country: US
Kind Code: B2

Title: Dual configuration for display data lines

Abstract:
A display having data lines that can be configured between a display mode and a touch mode is disclosed. The display can have sense regions for sensing a touch or near touch on the display during the touch mode. These same regions can display graphics or data on the display during the display mode. During display mode, the data lines in the sense regions can be configured to couple to display circuitry in order to receive data signals from the circuitry for displaying. During touch mode, the data lines in the sense regions can be configured to couple to corresponding sense lines in the regions, which in turn can couple to touch circuitry, in order to transmit touch signals to the circuitry for sensing a touch or near touch. Alternatively, during touch mode, the data lines in the sense regions can be configured to couple to ground in order to transmit residual data signals to ground for discarding.

Claims:
What is claimed is: 
     
       1. A display device switchable between a display mode and a touch mode, the device comprising:
 at least a first and second drive region, each having a plurality of display pixels having storage capacitors connected together along first and second, different directions by first and second common voltage lines; 
 a sense region positioned between the first and second drive regions, the sense region having a plurality of display pixels having storage capacitors connected together along the first and second directions by third and fourth common voltage lines, 
 the first common voltage lines of the first drive region electrically bypassing the sense region to couple to the first common voltage lines of the second drive region; 
 each display pixel of the sense region having a data line configured to transmit a display data signal and a sense line configured to transmit a touch signal, the sense line being distinct from the data line; and 
 a switch configured to switch the data line between a first configuration associated with a display mode and a second configuration associated with a touch mode, 
 wherein in the second configuration, the data line is coupled to the sense line, the sense line being coupled to a touch circuit in order to sense a touch or near touch on the device. 
 
     
     
       2. The device of  claim 1 , wherein the first configuration comprises the data line coupled to a display circuit of the device for sending the transmitted display data signal in order to display graphics or data on the device. 
     
     
       3. The device of  claim 1 , comprising:
 the touch circuit configured to receive the touch signal from the sense line and a residual data signal from the data line during the touch mode in order to sense a touch or near touch on the device. 
 
     
     
       4. The device of  claim 1 , comprising:
 the display circuit configured to send the display data signal to the data line during the display mode in order to display graphics or data on the device. 
 
     
     
       5. The device of  claim 1 , further comprising one or more other switches configured to couple the sense line to the touch circuit in the second configuration and to couple the sense line to receive a common voltage in the first configuration. 
     
     
       6. The device of  claim 1  incorporated into at least one of a mobile telephone, a digital media player, or a personal computer. 
     
     
       7. A display device having a display mode and a touch mode, comprising:
 at least a first and second drive region, each having a plurality of display pixels having storage capacitors connected together along first and second, different directions by first and second common voltage lines; 
 a sense region positioned between the first and second drive regions, the sense region having a plurality of display pixels having storage capacitors connected together along the first and second directions by third and fourth common voltage lines; 
 each of the plurality of display pixels of the sense region having a data line and a distinct sense line; 
 the first common voltage lines of the first drive region electrically bypassing the sense region to couple to the first common voltage lines of the second drive region; 
 wherein the data line is configured to couple to the sense line during a touch mode for reducing parasitic capacitance created by the data line. 
 
     
     
       8. The device of  claim 7 , comprising:
 a switch configured to couple the data line to the sense line during the touch mode. 
 
     
     
       9. The device of  claim 8 , wherein the switch is configured to decouple the data line from the sense line during a display mode. 
     
     
       10. The device of  claim 7 , comprising:
 a switch configured to couple the data line to a display circuit during a display mode. 
 
     
     
       11. The device of  claim 10 , wherein the switch is configured to decouple the data line from the display circuit during the touch mode. 
     
     
       12. A display device having a display mode and a touch mode, comprising:
 a plurality of pixels, each of the plurality of pixels having a data line and a sense line, the sense line being distinct from the data line, wherein some of the data lines are configured to couple to a touch circuit to sense touch or near touch on the device during the touch mode and others of the data lines are configured to couple to ground during the touch mode for reducing parasitic capacitance created by the data line. 
 
     
     
       13. The device of  claim 12 , comprising:
 one or more switches configured to couple the others of the data lines to ground during the touch mode to discard display data signals from the others of the data lines. 
 
     
     
       14. The device of  claim 12 , comprising: one or more switches configured to couple the some and the others of the data lines to the display circuit during the display mode, the display circuit configured to send display data based on a display data signal to the coupled data lines. 
     
     
       15. The device of  claim 12 , wherein the sense line is coupled to the touch circuit during the touch mode, the touch circuit configured to sense a touch based on touch signals received from the coupled sense lines. 
     
     
       16. A method for configuring a display device having a display mode and a touch mode, the method comprising:
 for a touch mode, switching some of a plurality of data lines corresponding to a plurality of pixels of the device to couple to a plurality of sense lines of the device and others of the plurality of data lines of the device to couple to ground, the plurality of sense lines being distinct from the some and the others of the plurality of data lines. 
 
     
     
       17. The method of  claim 16 , comprising:
 for a display mode, switching the some and the others of the plurality of data lines to couple to a display circuit of the device. 
 
     
     
       18. The method of  claim 16 , comprising:
 for the touch mode comprising the some of the plurality of data lines coupled to the plurality of sense lines, transmitting first signals from the plurality of sense lines with second signals from the some of the plurality of data lines to a touch circuit to sense a touch or near touch on the display device. 
 
     
     
       19. The method of  claim 16 , comprising: for the touch mode comprising the others of the plurality of data line coupling to ground, transmitting a first signal from the others of the plurality of data lines to ground and a second signal from the plurality of sense lines to a touch circuit of the device to sense a touch or near touch on the device. 
     
     
       20. A method for switching a display device between a display mode and a touch mode, the method comprising:
 determining whether a mode signal is associated with a display mode or a touch mode for a display device; 
 for the determined mode signal associated with the display mode, switching a data line of a pixel of the display device to couple to a display circuit of the display device; and 
 for the determined mode signal associated with the touch mode, switching the data line of the pixel of the display device to decouple from the display circuit of the display device and coupling the data line to a sense line, the sense line being distinct from the data line; 
 wherein the display device has a plurality of pixels with a plurality of sense lines and a plurality of data lines, the method comprising: 
 during the touch mode, coupling some of the plurality of data lines with some of the plurality of sense lines and decoupling the some of the plurality of data lines from the display circuitry. 
 
     
     
       21. The method of  claim 20 , comprising:
 during the touch mode, switching others of the plurality of data lines to ground and decoupling the others of the plurality of data lines from the display circuitry.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims benefit of U.S. Provisional Application No. 61/149,267, filed Feb. 2, 2009, the contents of which are incorporated herein by reference in their entirety for all purposes. 
    
    
     FIELD 
     This relates to displays having pixels for both display and touch modes and, more particularly, to displays having pixels with data lines configurable for both display mode and touch mode. 
     BACKGROUND 
     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. 
     Because typical touch screens have the touch sensor panel overlaying the display device, the touch screens can be heavier, thicker, and dimmer. A lighter, thinner, and brighter touch screen has been developed in which the touch sensor panel is integrated with the display device to provide both display and touch capabilities. Such a touch screen is described in U.S. patent application Ser. No. 11/760,080, entitled “Touch Screen Liquid Crystal Display,” and U.S. patent application 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. 
     However, because of the dual capabilities of the touch screen, it can be difficult to effectively detect touch on the screen when executing the touch capabilities due to interference, e.g., parasitic capacitance, from the display circuitry. More expense and power could be needed to provide a more robust touch signal that can overcome this difficulty. 
     SUMMARY 
     This relates to a display having display and touch modes, in which data lines in a sense region of the display can be configured differently in each mode. In some embodiments, during display mode, one or more data lines in pixels of the display can be configured to couple to display circuitry for displaying graphics or data based on the data signal(s) transmitted along the data lines. 
     In some embodiments, during touch mode, one or more data lines in pixels in a sense region of the display can be configured to couple to a sense line in the pixels, which is coupled to touch circuitry, for sensing touch or near touch based on the touch signal(s) transmitted from the sense line. In some other embodiments, during touch mode, one or more data lines in pixels in a sense region of the display can be configured to couple to ground. 
     The configuration of the data lines during touch mode can advantageously reduce parasitic capacitance associated with the data lines during touch mode, thereby improving the effectiveness of the display and reducing its cost and power requirements. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a partial circuit diagram of exemplary pixels in an LCD having display and touch modes in which one or more data lines of the pixels can be configured based on the mode according to various embodiments. 
         FIG. 2  illustrates an exemplary LCD having display and touch modes in which touch regions can be formed by groups of pixels in the LCD according to various embodiments. 
         FIG. 3  illustrates a partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. 
         FIG. 4  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. 
         FIG. 5  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. 
         FIG. 6  illustrates a partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple to ground during touch mode according to various embodiments. 
         FIG. 7  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple to ground during touch mode according to various embodiments. 
         FIG. 8  illustrates an exemplary method for configuring one or more data lines of an LCD having display and touch modes to couple to a sense line of the LCD during touch mode according to various embodiments. 
         FIG. 9  illustrates another exemplary method for configuring one or more data lines of an LCD having display and touch modes to couple to ground during touch mode according to various embodiments. 
         FIG. 10  illustrates an exemplary computing system having an LCD with display and touch modes according to various embodiments. 
         FIG. 11   a  illustrates an exemplary mobile telephone having an LCD with display and touch modes according to various embodiments. 
         FIG. 11   b  illustrates an exemplary digital media player having an LCD with display and touch modes according to various embodiments. 
         FIG. 11   c  illustrates an exemplary personal computer having an LCD with display and touch modes according to various embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     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 an LCD having display and touch modes, in which data lines in a sense region of the display can be configured differently in each mode. In some embodiments, during display mode, one or more data lines in pixels of the LCD can be configured to couple to display circuitry for displaying graphics and data based on the data signal(s) transmitted along the data lines. In some embodiments, during touch mode, one or more data lines in pixels in a sense region of the LCD can be configured to couple to a sense line in the pixels, which is coupled to touch circuitry, for sensing touch based on the touch signal(s) transmitted from the sense line. In some embodiments, during touch mode, one or more data lines in pixels in a sense region of the LCD can be configured to couple to ground. 
     The configuration of the data lines during touch mode can advantageously reduce parasitic capacitance associated with the data lines during touch mode, thereby improving the effectiveness of the LCD and reducing its cost and power requirements. 
     The terms “drive line,” “horizontal common voltage line,” and “xVcom” can refer to horizontal conductive lines of the LCD. In most cases, though not always, the term “drive line” can be used when referring to these conductive lines in the drive regions when the LCD is in touch mode because the lines can transmit a stimulation signal for driving the drive regions of the display. 
     The terms “sense line,” “vertical common voltage line,” and “yVcom” can refer to vertical conductive lines of the LCD. In most cases, though not always, the term “sense line” can be used when referring to these conductive lines in the sense regions when the LCD is in the touch mode because the lines can transmit a touch signal for sensing a touch or near touch on the display. 
     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 LCDs, it should be understood that embodiments are not so limited, but are generally applicable to any devices utilizing display and touch capabilities according to various embodiments. 
       FIG. 1  illustrates a partial circuit diagram of exemplary pixels of an LCD having display and touch modes in which one or more data lines of the pixels can be configured based on the mode according to various embodiments. In the example of  FIG. 1 , LCD  100  can include LCD subpixels according to various embodiments. The subpixels of the LCD  100  can be configured such that they are capable of dual-functionality as both LCD subpixels and touch sensor elements. That is, the subpixels can include circuit elements, such as capacitive elements, electrodes, etc., that can operate as part of the LCD circuitry of the pixels and that can also operate as elements of touch sensing circuitry. In this way, the LCD  100  can operate as an LCD with integrated touch sensing capability.  FIG. 1  shows details of subpixels  101 ,  102 ,  103 , and  104  of the LCD  100 . Note that each of the subpixels can represent either red (R), green (G) or blue (B), with the combination of all three R, G and B subpixels forming a single color pixel. 
     Subpixel  102  can include thin film transistor (TFT)  155  with gate  155   a , source  155   b,  and drain  155   c.  Subpixel  102  can also include storage capacitor, Cst  157 , with upper electrode  157   a  and lower electrode  157   b,  liquid crystal capacitor, Clc  159 , with subpixel electrode  159   a  and common electrode  159   b,  and color filter voltage source, Vcf  161 . 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  157 . If a subpixel does not utilize IPS, Vcf  151  can be, for example, an indium-tin-oxide (ITO) layer on the color filter glass. Subpixel  102  can also include a portion  117   a  of a data line for green (G) color data, Gdata line  117 , and a portion  113   b  of gate line  113 . Gate  155   a  can be connected to gate line portion  113   b,  and source  155   b  can be connected to Gdata line portion  117   a.  Upper electrode  157   a  of Cst  157  can be connected to drain  155   c  of TFT  155 , and lower electrode  157   b  of Cst  157  can be connected to a portion  121   b  of a common voltage line that runs in the x-direction, xVcom  121 . Subpixel electrode  159   a  of Clc  159  can be connected to drain  155   c  of TFT  155 , and common electrode  159   b  of Clc  159  can connected to Vcf  151 . 
     The circuit diagram of subpixel  103  can be identical to that of subpixel  102 . However, as shown in  FIG. 1 , color data line  119  running through subpixel  103  can carry blue (B) color data. Subpixels  102  and  103  can be, for example, known LCD subpixels. 
     Similar to subpixels  102  and  103 , subpixel  101  can include thin film transistor (TFT)  105  with gate  105   a,  source  105   b,  and drain  105   c.  Subpixel  101  can also include storage capacitor, Cst  107 , with upper electrode  107   a  and lower electrode  107   b , liquid crystal capacitor, Clc  109 , with subpixel electrode  109   a  and common electrode  109   b,  and color filter voltage source, Vcf  111 . Subpixel  101  can also include a portion  115   a  of a data line for red (R) color data, Rdata line  115 , and a portion  113   a  of gate line  113 . Gate  105   a  can be connected to gate line portion  113   a,  and source  105   b  can be connected to Rdata line portion  115   a.  Upper electrode  107   a  of Cst  107  can be connected to drain  105   c  of TFT  105 , and lower electrode  107   b  of Cst  107  can be connected to a portion  121   a  of xVcom  121 . Subpixel electrode  109   a  of Clc  109  can be connected to drain  105   c  of TFT  105 , and common electrode  109   b  of Clc  109  can be connected to Vcf  111 . 
     Unlike subpixels  102  and  103 , subpixel  101  can also include a portion  123   a  of a common voltage line running in the y-direction, yVcom  123 . In addition, subpixel  101  can include a connection  127  that connects portion  121   a  to portion  123   a . Thus, connection  127  can connect xVcom  121  and yVcom  123 . 
     Subpixel  104  (only partially shown in  FIG. 1 ) can be similar to subpixel  101 , except that a portion  125   a  of a yVcom  125  can have a break (open)  131 , and a portion  121   b  of xVcom  121  can have a break  133 . 
     As can be seen in  FIG. 1 , the lower electrodes of storage capacitors of subpixels  101 ,  102 , and  103  can be connected together by xVcom  121 . This can be, for example, a type of connection in known LCD panels and, when used in conjunction with known gate lines, data lines, and transistors, can allow subpixels to be addressed. The addition of vertical common voltage lines along with connections to the horizontal common voltage lines can allow grouping of subpixels in both the x-direction and y-direction, as described in further detail below. For example, yVcom  123  and connection  127  to xVcom  121  can allow the storage capacitors of subpixels  101 ,  102 , and  103  to be connected to storage capacitors of subpixels that are above and below subpixels  101 ,  102 ,  103  (the subpixels above and below are not shown). For example, the subpixels immediately above subpixels  101 ,  102 , and  103  can have the same configurations as subpixels  101 ,  102 , and  103 , respectively. In this case, the storage capacitors of the subpixels immediately above subpixels  101 ,  102 , and  103  would be connected to the storage capacitors of subpixels  101 ,  102 , and  103 . 
     In general, an LCD can be configured such that the storage capacitors of all subpixels in the panel can be connected together, for example, through at least one vertical common voltage line with connections to horizontal common voltage lines. Another LCD 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  125  of LCD  100  can have break  131 , which can allow subpixels above the break to be isolated from subpixels below the break. Likewise, xVcom  121  can have break  133 , which can allow subpixels to the right of the break to be isolated from subpixels to the left of the break. 
     Touch regions of an LCD can be formed by groups of pixels (each pixel including a red, green, and blue subpixel as in  FIG. 1 ) electrically connected together to form drive regions for driving stimulation signals and to form sense regions for sensing a touch or near touch of an object, such as a finger, during touch mode. 
       FIG. 2  illustrates an exemplary LCD having display and touch modes in which touch regions can be formed by groups of pixels in the LCD according to various embodiments. In the example of  FIG. 2 , LCD  200  can have touch regions, which can include drive regions  210  and sense regions  220 . The drive regions  210  and the sense regions  220  can include groups of pixels  203 , which can display graphics or data in the display mode and sense touch or near touch in the touch mode. For simplicity, each pixel  203  is shown as a single block with a vertical common voltage line yVcom  202  and a horizontal common voltage line xVcom  201 , where each single pixel block can represent a group of red, green, and blue subpixels each having a data line, as shown in  FIG. 1 . 
     A drive region  210  can be formed by connecting at least one vertical common voltage line yVcom  202  of a pixel  203  with at least one horizontal common voltage line xVcom  201  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 pixels together to form the drive region for touch mode. Generally, a drive region can be larger than a single row of pixels, comparable to the size of a finger tip, for example, in order to effectively receive a touch or near touch on the LCD. 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 be used to stimulate the drive regions with stimulation signals. In some embodiments, drive regions proximate to each other can share vertical common voltage lines yVcom with breaks  212  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  220  can be formed by at least one vertical common voltage line yVcom  202  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 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 a matrix 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 display. In the sense region, the vertical common voltage lines yVcom can be unconnected from and can cross over the horizontal common voltage lines xVcom at positions  211  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. 
     In operation during touch mode, the horizontal common voltage lines xVcom  201  can transmit stimulation signals to stimulate the drive regions  210  to form electric field lines between the stimulated drive regions and adjacent sense regions  220 . When an object, such as a finger, touches or near touches a stimulated drive region  210 , the object can affect some of the electric field lines extending to the adjacent sense regions  220 , thereby reducing the amount of charge coupled to these adjacent sense regions. This reduction in charge can be sensed by the sense regions  220  as an “image” of touch. This touch image can be transmitted along the vertical common voltage lines yVcom  202  to touch circuitry for further processing. 
     The drive regions of  FIG. 2  are shown as rectangles connected in rows across the LCD and the sense regions of  FIG. 2  are shown as rectangles extending the vertical length of the LCD. However, the drive and sense regions are not limited to the shapes, orientations, and positions shown, but can include any suitable configurations according to various embodiments. 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 display and touch capabilities according to various embodiments. 
     Parasitic capacitance can develop in a sense region of the LCD according to various embodiments. For example, parasitic capacitance can form between a data line and a sense plate or between a data line and an xVcom line. Such parasitic capacitance can interfere with touch circuitry operation, in particular with a touch circuit&#39;s ability to effectively measure a touch signal generated based on a touch or near touch on the LCD.  FIGS. 3-7  illustrate exemplary circuits that can attenuate the effects of this and other parasitic capacitance on touch circuitry operation according to various embodiments. 
       FIG. 3  illustrates a partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. In the example of  FIG. 3 , circuit  300  can include pixels having sense region  320 , where each pixel can have sense line  302 , which can be yVcom, and red, green, and blue data lines  315 ,  317 ,  319 , respectively. Although only one pixel is illustrated in  FIG. 3 , it is to be understood that a sense region can include pixels having sense lines and red, green, and blue data lines according to various embodiments. 
     For touch mode, sense line  302  can couple to touch circuit  360  for sensing a touch or near touch based on touch signals transmitted over the sense line. Switch  302 - a  can couple the sense line  302  to the touch circuit  360 . Data lines  315 ,  317 ,  319  can couple to the sense line  302  so as to form one electrical load on the touch circuit  360 , thereby reducing the parasitic capacitance formed between the data lines and the sense plate and avoiding adverse operation of the touch circuit. The data lines  315 ,  317 ,  319  can couple together and switch  350 - a  can couple the data lines via the sense line  302  to the touch circuit  360  for sensing a touch or near touch. 
     For display mode, data lines  315 ,  317 ,  319  can couple to LCD circuit  370  for displaying graphics or data based on display data signals transmitted over the data lines. The data lines  315 ,  317 ,  319  can couple together and switch  350 - b  can couple the data lines to the LCD circuit  370 , which can then transmit data signals along the data lines for displaying graphics or data on the LCD. The sense line  302  can couple to the LCD circuit  370  to hold an xVcom signal when not being used for touch. Switch  302 - b  can couple the sense line  302  to xVcom from the LCD circuit  370 . 
       FIG. 4  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. In the example of  FIG. 4 , circuit  400  can include pixels having sense region  420 , where each pixel can have sense line  402 , which can be yVcom, and red, green, and blue data lines  415 ,  417 ,  419 , respectively. Although only one pixel is illustrated in  FIG. 4 , it is to be understood that a sense region can include pixels having sense lines and red, green, and blue data lines according to various embodiments. 
     For touch mode, sense line  402  can couple to touch circuit  460  for sensing a touch or near touch based on touch signals transmitted over the sense line. Switch  402 - a  can couple the sense line  402  to the touch circuit  460 . Data lines  415 ,  417 ,  419  can couple to the sense line  402  so as to form one electrical load on the touch circuit  460 , thereby reducing the parasitic capacitance formed between the data lines and the sense plate and avoiding adverse operation of the touch circuit. Switches  415 - a ,  417 - a ,  419 - a  can couple data lines  415 ,  417 ,  419 , respectively, via the sense line  402  to the touch circuit  460  for sensing a touch or near touch. 
     For display mode, data lines  415 ,  417 ,  419  can couple to LCD circuit  470  for displaying graphics or data based on display data signals transmitted over the data lines. Switches  415 - b ,  417 - b ,  419 - b  can couple data lines  415 ,  417 ,  419 , respectively, to the LCD circuit  470 , which can then transmit data signals along the data lines for displaying graphics or data on the LCD. The sense line  402  can couple to the LCD circuit  470  to hold an xVcom signal when not being used for touch. Switch  402 - b  can couple the sense line  402  to xVcom from the LCD circuit  470 . 
       FIG. 5  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple with a sense line of the pixel during touch mode according to various embodiments. In the example of  FIG. 5 , circuit  500  can include pixels having sense region  520 , where each pixel can have sense line  502 , which can be yVcom, and red, green, and blue data lines  515 ,  517 ,  519 , respectively. Although only one pixel is illustrated in  FIG. 5 , it is to be understood that a sense region can include pixels having sense lines and red, green, and blue data lines according to various embodiments. 
     For touch mode, sense line  502  can couple to touch circuit  560  for sensing a touch or near touch based on touch signals transmitted over the sense line. Switch  502 - a  can couple the sense line  502  to the touch circuit  560 . Data lines  515 ,  517 ,  519  can couple to the sense line  502  so as to form one electrical load on the touch circuit  560 , thereby reducing the parasitic capacitance formed between the data lines and the sense plate and avoiding adverse operation of the touch circuit. Switches  515 - a ,  517 - a ,  519 - a  can couple the data lines  515 ,  517 ,  519 , respectively, together and switch  580 - a  can couple the data lines via the sense line  502  to the touch circuit  560  for sensing a touch or near touch. 
     For display mode, data lines  515 ,  517 ,  519  can couple to LCD circuit  570  for displaying graphics or data based on display data signals transmitted over the data lines. Switches  515 - a ,  517 - b ,  519 - a  can couple the data lines  515 ,  517 ,  519 , respectively, together and switch  580 - b  can couple the data lines to the LCD circuit  570 , which can then transmit data signals along the data lines for displaying graphics or data on the LCD. The sense line  502  can couple to the LCD circuit  570  to hold an xVcom signal when not being used for touch. Switch  502 - b  can couple the sense line  502  to xVcom from the LCD circuit  570 . 
       FIG. 6  illustrates a partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple to ground during touch mode according to various embodiments. In the example of  FIG. 6 , circuit  600  can include pixels having sense region  620 , where the pixels can have sense line  602 , which can be yVcom, and red, green, and blue data lines  615 ,  617 ,  619 , respectively. Although only one pixel is illustrated in  FIG. 6 , it is to be understood that a sense region can include pixels having sense lines and red, green, and blue data lines according to various embodiments. 
     For touch mode, sense line  602  can couple to touch circuit  660  for sensing a touch or near touch based on touch signals transmitted over the sense line. Switch  602 - a  can couple the sense line  602  to the touch circuit  660 . Data lines  615 ,  617 ,  619  can couple to ground so as to reduce parasitic capacitance formed between the data lines and xVcom on the sense region  620 , thereby reducing adverse effects on the touch circuit. Switches  615 - a ,  617 - a ,  619 - a  can couple data lines  615 ,  617 ,  619 , respectively, to AC ground  680 . Alternatively, the data lines  615 ,  617 ,  619  can couple to a DC source. 
     For display mode, data lines  615 ,  617 ,  619  can couple to LCD circuit  670  for displaying graphics or data based on display data signals transmitted over the data lines. Switches  615 - b ,  617 - b ,  619 - b  can couple data lines  615 ,  617 ,  619 , respectively, to the LCD circuit  670 , which can then transmit data signals along the data lines for displaying graphics or data on the LCD. The sense line  602  can couple to the LCD circuit  670  to hold an xVcom signal when not being used for touch. Switch  602 - b  can couple the sense line  602  to xVcom from the LCD circuit  670 . 
       FIG. 7  illustrates another partial circuit diagram of an exemplary pixel in an LCD having display and touch modes in which one or more data lines of the pixel can be configured to couple to ground during touch mode according to various embodiments. In the example of  FIG. 7 , circuit  700  can include pixels having sense region  720 , where the pixels can have sense line  702 , which can be yVcom, and red, green, and blue data lines  715 ,  717 ,  719 , respectively. Although only one pixel is illustrated in  FIG. 7 , it is to be understood that a sense region can include pixels having sense lines and red, green, and blue data lines according to various embodiments. 
     For touch mode, sense line  702  can couple to touch circuit  760  for sensing a touch or near touch based on touch signals transmitted over the sense line. Switch  702 - a  can couple the sense line  702  to the touch circuit  760 . Data lines  715 ,  717 ,  719  can couple to ground so as to reduce parasitic capacitance formed between the data lines and xVcom on the sense region  720 , thereby reducing adverse effects on the touch circuit. Switches  715 - a ,  717 - a ,  719 - a  can couple data lines  715 ,  717 ,  719 , respectively, together and switch  775 - a  can couple the data lines to AC ground  780 . Alternatively, the data lines  715 ,  717 ,  719  can couple to a DC source. 
     For display mode, data lines  715 ,  717 ,  719  can couple to LCD circuit  770  for displaying graphics or data based on display data signals transmitted over the data lines. Switches  715 - a ,  717 - a ,  719 - a  can couple data lines  715 ,  717 ,  719 , respectively, together and switch  775 - b  can couple the data lines to the LCD circuit  770 , which can then transmit data signals along the data lines for displaying graphics or data on the LCD. The sense line  702  can couple to the LCD circuit  770  to hold an xVcom signal when not being used for touch. Switch  702 - b  can couple the sense line  702  to xVcom from the LCD circuit  770 . 
     It is to be understood that the circuitry for handling parasitic capacitance is not limited to that illustrated in  FIGS. 3-7 , but may include other or additional components capable of handling parasitic capacitance according to various embodiments. Although  FIGS. 3-7  show separate touch and LCD circuits, the circuits or portions thereof can be combined into a single application specific integrated circuit (ASIC). 
     In some embodiments, some of the data lines can be coupled to the sense line and some can be coupled to ground during the touch mode. For example, every other data line can be coupled to the sense line and the remainder data lines coupled to ground during the touch mode. Other configurations can also be possible depending on the needs of the LCD. 
       FIG. 8  illustrates an exemplary method for configuring one or more data lines of an LCD having display and touch modes to couple to a sense line of the LCD during touch mode according to various embodiments. The method can be executed on the circuits of  FIGS. 3-5 , for example. In the example of  FIG. 8 , an input signal can be received, indicating whether to execute in either display mode or touch mode ( 805 ,  810 ). 
     If the input signal is determined to be for display mode, data lines in the sense region of the LCD can be switched to couple to the LCD circuit in order to receive data signals ( 815 ). Once coupled, the LCD circuit can transmit data signals along the data lines for displaying graphics or data on the LCD ( 820 ). Optionally, sense lines in the sense region of the LCD can be switched to couple to the LCD circuit to hold at common voltage. 
     If the input signal is determined to be for touch mode, data lines in the sense region of the LCD can be switched to couple to the touch circuit via a corresponding sense line in the sense region ( 825 ). That is, the data lines can be coupled to the sense line, which can be coupled to the touch circuit. Touch signals can be transmitted along the sense line to indicate a touch or near touch on the LCD. Any residual data signals on the data lines can be coupled with the touch signals ( 830 ). The coupled signals can be transmitted to the touch circuit for sensing a touch on the LCD ( 835 ). 
       FIG. 9  illustrates another exemplary method for configuring one or more data lines of an LCD having display and touch modes to couple to ground during touch mode according to various embodiments. The method can be executed by the circuits of  FIGS. 6 and 7 , for example. In the example of  FIG. 9 , an input signal can be received, indicating whether to execute either a display mode or a touch mode ( 905 ,  910 ). 
     If the input signal is determined to be for display mode, the data lines in the sense region of the LCD can be switched to couple to the LCD circuit ( 915 ). The LCD circuit can transmit data signals along the data lines for displaying on the LCD ( 920 ). Optionally, sense lines in the sense region can be coupled to the LCD circuit to hold to common voltage. 
     If the input signal is determined to be for touch mode, the data lines in the sense region can be switched to AC ground ( 925 ). Any residual data signals on the data lines can be transmitted to AC ground ( 930 ). A corresponding sense line can couple to the touch circuit. Touch signals can be transmitted along the sense line to the touch circuit for sensing a touch on the LCD ( 935 ). 
     It is to be understood that the methods for configuring an LCD having display and touch modes are not limited to those of  FIGS. 8 and 9 , but can include additional or other methods capable of performing according to various embodiments. 
       FIG. 10  illustrates an exemplary computing system that can include one or more of the various embodiments described herein. In the example of  FIG. 10 , computing system  1000  can include one or more panel processors  1002  and peripherals  1004 , and panel subsystem  1006 . Peripherals  1004  can include, but are not limited to, random access memory (RAM) or other types of memory or storage, watchdog timers and the like. Panel subsystem  1006  can include, but is not limited to, one or more sense channels  1008 , channel scan logic (analog or digital)  1010  and driver logic (analog or digital)  1014 . Channel scan logic  1010  can access RAM  1012 , autonomously read data from sense channels  1008  and provide control signals  1017  for the sense channels. In addition, channel scan logic  1010  can control driver logic  1014  to generate stimulation signals  1016  at various phases that can be simultaneously applied to drive regions of touch screen  1024 . Panel subsystem  1006  can operate at a low digital logic voltage level (e.g. 1.7 to 3.3V). Driver logic  1014  can generate a supply voltage greater that the digital logic level supply voltages by cascading two charge storage devices, e.g., capacitors, together to form charge pump  1015 . Charge pump  1015  can be used to generate stimulation signals  1016  that can have amplitudes of about twice the digital logic level supply voltages (e.g. 3.4 to 6.6V). Although  FIG. 10  shows charge pump  1015  separate from driver logic  1014 , the charge pump can be part of the driver logic. In some embodiments, panel subsystem  1006 , panel processor  1002  and peripherals  1004  can be integrated into a single application specific integrated circuit (ASIC). 
     Touch screen  1024  can include a capacitive sensing medium having drive regions  1027  and sense regions  1029  according to various embodiments. Each drive region  1027  and each sense region  1029  can include capacitive elements, which can be viewed as pixels  1026  and which can be particularly useful when touch screen  1024  is viewed as capturing an “image” of touch. (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 screen at which a touch event occurred can be viewed as an “image” of touch (e.g. a pattern of fingers touching the screen).) 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 signal capacitance. Each sense region of touch screen  1024  can drive sense channel  1008  in panel subsystem  1006 . 
     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&#39;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  FIG. 10 ) and executed by panel processor  1002 , or stored in program storage  1032  and executed by host processor  1028 . The firmware can also be stored and/or transported within any computer-readable 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 “computer-readable medium” can be any medium that can contain or store the program for use by or in connection with the instruction execution system, apparatus, or device. The computer readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, a portable computer diskette (magnetic), a random access memory (RAM) (magnetic), a read-only memory (ROM) (magnetic), an erasable programmable read-only memory (EPROM) (magnetic), a portable optical disc such a CD, CD-R, CD-RW, DVD, DVD-R, or DVD-RW, or flash memory such as compact flash cards, secured digital cards, USB memory devices, memory sticks, and the like. 
     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  FIG. 10 , but may be a proximity screen or any other screen switchable between a display mode and a touch mode according to various embodiments. In addition, the touch sensor panel described herein can be either a single-touch or a multi-touch sensor panel. 
       FIG. 11   a  illustrates an exemplary mobile telephone  1136  that can include touch screen  1124  and other computing system blocks that can be utilized for configuring data lines of the touch screen during touch mode of the telephone. 
       FIG. 11   b  illustrates an exemplary digital media player  1140  that can include touch screen  1124  and other computing system blocks that can be utilized for configuring data lines of the touch screen during touch mode of the media player. 
       FIG. 11   c  illustrates an exemplary personal computer  1144  that can include touch screen  1124 , touch sensor panel (trackpad)  1126 , and other computing system blocks that can be utilized for configuring data lines of the touch screen during touch mode of the personal computer. 
     The mobile telephone, media player, and personal computer of  FIGS. 11   a ,  11   b  and  11   c  can be cost and power saving with an LCD having display and touch modes with configurable data lines according to various embodiments. 
     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 various embodiments as defined by the appended claims.

Metadata:
Filing Date: 20090821
Publication Date: 20140624
Grant Date: 20140624
Priority Date: 20090202
Inventors: HOTELLING STEVEN PORTER
YOUSEFPOR MARDUKE
CHANG SHIH CHANG
Assignee: APPLE INC
CPC Classifications: [{"code": "G09G3/3696", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0445", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/0445", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04107", "inventive": false, "first": false, "tree": "[]"}, {"code": "G09G3/3696", "inventive": true, "first": false, "tree": "[]"}, {"code": "G09G3/3648", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0416", "inventive": true, "first": false, "tree": "[]"}, {"code": "G09G2310/0297", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F2203/04107", "inventive": false, "first": false, "tree": "[]"}, {"code": "G09G2310/0297", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F2203/04107", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": true, "tree": "[]"}, {"code": "G09G3/3648", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0445", "inventive": true, "first": false, "tree": "[]"}, {"code": "G09G3/3648", "inventive": true, "first": false, "tree": "[]"}, {"code": "G09G2310/0297", "inventive": false, "first": false, "tree": "[]"}]
Family ID: 42154633