PATENT DOCUMENT

Publication Number: US-9836165-B2
Application Number: US-201414280355-A
Country: US
Kind Code: B2

Title: Integrated silicon-OLED display and touch sensor panel

Abstract:
An integrated Silicon-OLED display and touch sensor panel is disclosed. The integrated Silicon-OLED display and touch sensor panel can include a Silicon substrate, an array of transistors, one or more metallization layers, one or more vias, an OLED stack, color filters, touch sensors, and additional components and circuitry. Additional components and circuitry can include an electrostatic discharge device, a light shielding, a switching matrix, one or more photodiodes, a near-infrared detector and near-infrared color filters. The integrated Silicon-OLED display and touch sensor panel can be further configured for near-field imaging, optically-assisted touch, and fingerprint detection. In some examples, a plurality of touch sensors and/or display pixels can be grouped into clusters, and the clusters can be coupled to a switching matrix for dynamic change of touch and/or display granularity.

Claims:
What is claimed is: 
     
       1. A touch sensor panel, comprising:
 one or more Silicon substrates; 
 a plurality of display pixels, each display pixel including a plurality of subpixels formed by an OLED stack on at least one of the one or more Silicon substrates, the plurality of subpixels configured to emit light; and 
 a plurality of touch sensors including:
 a plurality of first touch sensors formed from first touch electrodes having a first width on the at least one of the one or more Silicon substrates in between subpixels within a same display pixel, the plurality of first touch sensors being multi-functional components capable of detecting touch using the first touch electrodes and configured for shielding at least a portion of the emitted light from the plurality of subpixels; and 
 a plurality of second touch sensors formed from second touch electrodes having a second width on the at least one of the one or more Silicon substrates in between adjacent display pixels, the plurality of second touch sensors being capable of detecting touch using the second touch electrodes, wherein the second width is greater than the first width, and the plurality of subpixels and the plurality of second touch sensors are arranged in a pattern of rows and columns, wherein the plurality of second touch sensors are arranged as a plurality of rows along a first axis, wherein all of the second touch sensors of a row have different locations along a second axis than all of the touch sensors of an adjacent row, the second axis orthogonal to the first axis. 
 
 
     
     
       2. The touch sensor panel of  claim 1 , further comprising:
 a plurality of routing traces located on a same layer as the plurality of touch sensors and the plurality of subpixels and between two or more of the plurality of subpixels. 
 
     
     
       3. The touch sensor panel of  claim 1 , further comprising: an electrostatic discharge device coupled to at least one of the plurality of touch sensors and located between the plurality of touch sensors and the one or more Silicon substrates. 
     
     
       4. The touch sensor panel of  claim 1 , wherein an area of at least one of the plurality of second touch sensors is same as an area of at least one of the plurality of subpixels. 
     
     
       5. The touch sensor panel of  claim 1 , further comprising:
 one or more photodiodes configured to detect an optical image of a fingerprint. 
 
     
     
       6. The touch sensor panel of  claim 1 , further comprising:
 a near-infrared emitter configured to emit near-infrared light towards a touch object; and 
 a near-infrared detector configured to detect a reflection of the emitted near-infrared light to sense a touch associated with the touch object. 
 
     
     
       7. The touch sensor panel of  claim 1 , further comprising:
 a black mask located in a peripheral area of the touch sensor panel, the black mask formed of a same material as the plurality of touch sensors. 
 
     
     
       8. The touch sensor panel of  claim 1 , further comprising:
 a curved fiber optic magnifier coupled to the OLED stack and the plurality of touch sensors, wherein the one or more Silicon substrates are flexible substrates. 
 
     
     
       9. The touch sensor panel of  claim 1 , wherein the plurality of touch sensors are opaque. 
     
     
       10. The touch sensor panel of  claim 1 , wherein light shielding includes preventing color mixing of two or more of the plurality of subpixels. 
     
     
       11. The touch sensor panel of  claim 1 , further comprising:
 a cover material, wherein the plurality of touch sensors are located between the plurality of subpixels and the cover material. 
 
     
     
       12. The touch sensor panel of  claim 1 , wherein the first and second touch electrodes are located in a single layer. 
     
     
       13. The touch sensor panel of  claim 1 , further comprising one or more color filters, wherein at least one of the plurality of touch sensors is located on a same layer as at least one of the one or more color filters. 
     
     
       14. The touch sensor panel of  claim 13 , wherein each of the plurality of first touch sensors is located between two color filters. 
     
     
       15. The touch sensor panel of  claim 1 , further comprising:
 a plurality of clusters, each cluster including a set of the plurality of touch sensors electrically coupled together; 
 a plurality of switches, each switch coupled to one of the plurality of clusters; and 
 a switching matrix configured to dynamically change a touch granularity by coupling or decoupling each cluster to a touch controller. 
 
     
     
       16. The touch sensor panel of  claim 15 , wherein a number of switches included in the plurality of switches is less than a number of clusters included in the plurality of clusters. 
     
     
       17. A method of detecting a touch using a touch sensor panel, the method comprising:
 displaying an image using a plurality of display pixels, each display pixel including a plurality of subpixels formed by an OLED stack formed on at least one of one or more Silicon substrates, the OLED stack configured to emit light; 
 detecting one or more touches using a plurality of first touch electrodes having a first width, the plurality of first touch electrodes included in a plurality of first touch sensors, the plurality of first touch sensors located on the at least one of the one or more Silicon substrates and in between subpixels within a same display pixel; 
 detecting the one or more touches using a plurality of second touch electrodes having a second width, the second touch electrodes included in a plurality of second touch sensors, the plurality of second touch sensors located on the at least one of the one or more Silicon substrates and in between adjacent display pixels, wherein the second width is greater than the first width, and the plurality of subpixels and the plurality of second touch sensors are arranged in a pattern of rows and columns, wherein the plurality of second touch sensors are arranged as a plurality of rows along a first axis, wherein all of the second touch sensors of a row have different locations along a second axis than all of the touch sensors of an adjacent row, the second axis orthogonal to the first axis; and 
 shielding at least a portion of the light emitted from the OLED stack using the plurality of first touch electrodes. 
 
     
     
       18. The method of  claim 17 , further comprising:
 dynamically changing a touch granularity by coupling or decoupling a plurality of clusters to a touch controller, wherein each cluster includes a plurality of touch sensors electrically coupled together, the plurality of touch sensors electrically coupled together including one or more of one or more of the plurality of first touch sensors and one or more of the plurality of second touch sensors. 
 
     
     
       19. The method of  claim 17 ,
 wherein detecting the one or more touches using one or more of the plurality of first touch sensors and the plurality of second touch sensors includes driving the one or more of the plurality of first touch sensors and the plurality of second touch sensors simultaneously with driving the plurality of subpixels. 
 
     
     
       20. The method of  claim 17 , further comprising:
 emitting near-infrared light; 
 detecting a reflection of the near-infrared light; and 
 determining the first or second touch based on the detected reflection and a capacitance or resistance detected by the plurality of first or second touch sensors. 
 
     
     
       21. The method of  claim 17 , further comprising:
 in an idle state:
 deactivating the plurality of first touch sensors and the plurality of second touch sensors; 
 activating one or more photodiodes to detect reflection of a fingerprint; 
 determining if the detected reflection matches a pre-determined image; and 
 unlocking the touch sensor panel when the detected reflection matches the pre-determined image, 
 
 wherein detecting the first touch using the plurality of first touch sensors and detecting the second touch using the plurality of second touch sensors are included in an active state. 
 
     
     
       22. The method of  claim 17 , wherein:
 detecting the one or more touches using the plurality of first touch electrodes includes detecting a first touch of the one or more touches, and 
 detecting the one or more touches using the plurality of second touch electrodes includes detecting a second touch of the one or more touches different from the first touch. 
 
     
     
       23. The method of  claim 17 , further comprising:
 detecting an optical image of a fingerprint using one or more photodiodes. 
 
     
     
       24. The method of  claim 23 , wherein displaying the image using the OLED stack includes driving the plurality of subpixels, wherein detecting the first touch using the plurality of first touch sensors includes driving the plurality of first touch sensors, wherein detecting the second touch using the plurality of second touch sensors includes driving the plurality of second touch sensors, and further wherein detecting the optical image of the fingerprint includes activating and driving the one or more photodiodes, the plurality of subpixels, the plurality of first touch sensors, the plurality of second touch sensors, and the one or more photodiodes simultaneously. 
     
     
       25. The method of  claim 23 , wherein detecting the optical image of the fingerprint includes:
 determining a difference of at least one of refractive indices and light reflections at two or more locations of the fingerprint; and 
 generating the optical image of the fingerprint based on the difference.

Description:
FIELD OF THE DISCLOSURE 
     This relates generally to a display and touch sensor panel and, more particularly, to an integrated Silicon-OLED display and touch sensor panel. 
     BACKGROUND OF THE DISCLOSURE 
     Many types of input devices are presently available for performing operations in a computing system, such as buttons or keys, mice, trackballs, joysticks, touch sensor panels, 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 positioned partially or fully behind the panel so that the touch-sensitive surface can cover at least a portion of the viewable area of the display device. The display device can include technologies such as liquid crystal displays (LCDs), organic light emitting diode (OLED) displays, etc. OLEDs, for example, can provide a flat or flexible display in a relatively thin package that can be suitable for use in a variety of portable electronic devices. In addition, OLED displays can display brighter and more vibrant images in a thinner and lighter package compared to LCD displays, making them suitable for use in compact portable electronic devices. 
     Advantages of OLED displays over other types of displays make integrating OLED displays into portable electronic devices attractive. Integrating the OLED display and touch screen into a single device can include fabricating the OLED stack on a glass or plastic substrate, forming the touch sensors on the OLED stack, and electrically coupling the touch sensors and transistors for the OLED stack using routing traces and one or more metallization layers. Alternatively, the OLED stack and the touch screen can be fabricated separately and then adhered together using a conductive paste. However, both techniques can include high temperature or high pressure processes that can damage the OLED stack. Furthermore, stacking the touch sensors and any routing circuitry for the touch sensors on the OLED stack can lead to portable electronic devices with unacceptable thicknesses. Additionally, formation of the OLED stack on a glass or plastic substrate can lead to poor manufacturing yields, high process variations, and poor transistor/wiring performance. 
     SUMMARY OF THE DISCLOSURE 
     This relates to integrated Silicon-OLED display and touch sensor panel stackup configurations that can be used in portable electronic devices such as media players, mobile telephones, and tablet computing devices. Stackup configurations can include a Silicon substrate, an array of transistors, one or more metallization layers, one or more vias, an OLED stack, color filters, touch sensors, and additional components and circuitry. Forming the OLED stack and touch sensors on a Silicon substrate can allow for an extremely high number of pixels per inch. With a high number of pixels per inch, the OLED subpixels can be arranged side-by-side with the touch sensors leading to portable electronic devices that are thinner and lighter. Arranging the OLED subpixels side-by-side with the touch sensors can also lead to a wider viewing angle display with a higher contrast ratio, higher brightness, and more vibrant colors without compromising touch sensitivity. 
     Due to the higher number of pixels per inch, the stackup configurations can also include one or more additional components such as electrostatic discharge devices, switches, near-field imagers, near-infrared emitters, and near-infrared detectors. The additional components can improve the functionality of the device by consuming less power, enhancing touch sensitivity, and enhancing fingerprint detection capabilities. In some examples, the integrated Silicon-OLED display and touch sensor panel can be coupled with one or more fiber optic magnifiers to achieve a portable electronic device with extended touch and display capability. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A-1C  illustrate systems in which examples of the disclosure can be implemented. 
         FIG. 2A  illustrates an exemplary White OLED stack. 
         FIG. 2B  illustrates an exemplary RGB OLED stack. 
         FIG. 3A  illustrates a cross-sectional view of an exemplary integrated OLED display and touch sensor panel fabricated on glass or plastic. 
         FIG. 3B  illustrates a top view of an exemplary integrated OLED display and touch sensor panel fabricated on glass or plastic. 
         FIG. 3C  illustrates a flow diagram for forming an exemplary integrated OLED display and touch sensor panel fabricated on glass or plastic. 
         FIG. 4A  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
         FIG. 4B  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
         FIG. 4C  illustrates a flow diagram for forming an exemplary integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
         FIG. 5  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel including an integrated electrostatic discharge device according to examples of the disclosure. 
         FIG. 6A  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel with touch sensors according to examples of the disclosure. 
         FIG. 6B  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel with a touch sensor layer according to examples of the disclosure. 
         FIG. 6C  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel with a touch sensor layer located closer to the touch and display surface according to examples of the disclosure. 
         FIG. 6D  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel with touch sensors and black matrix according to examples of the disclosure. 
         FIG. 7A  illustrates a close-up top view of subpixels and touch sensors grouped into clusters in an exemplary integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
         FIG. 7B  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel including a plurality of clusters according to examples of the disclosure. 
         FIG. 7C  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel with a staggered arrangement according to examples of the disclosure. 
         FIG. 7D  illustrates a plan view of an exemplary integrated Silicon-OLED display and touch sensor panel including a plurality of clusters coupled together according to examples of the disclosure. 
         FIG. 7E  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel employing mutual-capacitive sensing according to examples of the disclosure. 
         FIG. 7F  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel employing self-capacitive sensing according to examples of the disclosure. 
         FIG. 8A  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel including a photodiode according to examples of the disclosure. 
         FIGS. 8B-8C  illustrate top views of exemplary integrated Silicon-OLED display and touch sensor panels including photodiodes according to examples of the disclosure. 
         FIG. 9A  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel with fingerprint detection according to examples of the disclosure. 
         FIG. 9B  illustrates a flowchart for a process of capturing a near-field image from photodiodes in an integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
         FIG. 10A  illustrates a cross-sectional of an exemplary integrated Silicon-OLED display and touch sensor panel with a near-infrared detector according to examples of the disclosure. 
         FIG. 10B  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel with a near-infrared detector according to examples of the disclosure. 
         FIG. 10C  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel with fingerprint detection using a near-infrared emitters and near-infrared detectors according to examples of the disclosure. 
         FIGS. 10D-10E  illustrate top views of exemplary integrated Silicon-OLED display and touch sensor panels including near-field imaging photodiodes and near-infrared detectors according to examples of the disclosure. 
         FIGS. 11A-11B  illustrate cross-sectional views of exemplary integrated Silicon-OLED display and touch sensor panels coupled to fiber optic magnifiers according to examples of the disclosure. 
         FIG. 11C  illustrates a plan view of an exemplary integrated Silicon-OLED display and touch sensor panel with 180 degree display and touch capability according to examples of the disclosure. 
         FIG. 11D  illustrates a plan view of an exemplary integrated Silicon-OLED display and touch sensor panel with 270-degree display and touch capability according to examples of the disclosure. 
         FIG. 12  illustrates an exemplary computing system for a touch sensor panel according to examples of the disclosure. 
         FIG. 13  illustrates an exemplary computing system for an integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description of examples, reference is made to the accompanying drawings which form a part hereof, and in which it is shown by way of illustration specific examples that can be practiced. It is to be understood that other examples can be used and structural changes can be made without departing from the scope of the disclosed examples. 
     Various techniques and process flow steps will be described in detail with reference to examples as illustrated in the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects and/or features described or referenced herein. It will be apparent, however, to one skilled in the art, that one or more aspects and/or features described or referenced herein may be practiced without some or all of these specific details. In other instances, well-known process steps and/or structures have not been described in detail in order to not obscure some of the aspects and/or features described or referenced herein. 
     Further, although process steps or method steps can be described in a sequential order, such processes and methods can be configured to work in any suitable order. In other words, any sequence or order of steps that can be described in the disclosure does not, in and of itself, indicate a requirement that the steps be performed in that order. Further, some steps may be performed simultaneously despite being described or implied as occurring non-simultaneously (e.g., because one step is described after the other step). Moreover, the illustration of a process by its depiction in a drawing does not imply that the illustrated process is exclusive of other variations and modification thereto, does not imply that the illustrated process or any of its steps are necessary to one or more of the examples, and does not imply that the illustrated process is preferred. 
     This disclosure relates generally to an integrated Silicon-OLED display and touch sensor panel. Touch sensors and associated touch circuitry can be combined with an OLED display and associated display circuitry to form an integrated Silicon-OLED display and touch sensor panel. Existing schemes to combine a touch panel with a display can involve forming the touch sensors on top of the display or mounting a transparent touch panel on top of a display. In some examples, some layers of the touch panel can also serve as layers of the display and some of the touch sensor circuitry can be shared with some of the display circuitry. However, these systems can require multiple separate layers for the touch sensors, touch circuitry, display pixels, and display circuitry. This can result in relatively expensive and large, bulky systems. Furthermore, a brightness and quality of a displayed image can be decreased, as the touch related layers are usually not completely transparent. 
     Touch sensors and touch sensing circuitry can include, for example, touch signal lines, such as drive lines and sense lines, grounding regions, and other circuitry. One way to reduce the size of an integrated touch screen can be to include multi-function circuit elements that can form part of the display circuitry designed to operate as circuitry of the display system to generate an image on the display. The multi-function circuit elements can also form part of the touch sensing circuitry of a touch sensing system that can sense one or more touches on or near the display. The multi-function circuit elements can be, for example, capacitors in display pixels of an LCD that can be configured to operate as storage capacitors/electrodes, common electrodes, conductive wires/pathways, etc., of the display circuitry in the display system, and that can also be configured to operate as circuit elements of the touch sensing circuitry. In this way, for example, in a display with integrated touch sensing capability can be manufactured using fewer parts and/or processing steps, and the display itself can be thinner, brighter, and requires less power. However, as the compact portable electronic devices are becoming smaller and smaller, using multi-function circuit elements may still not meet the size and weight demands, particularly for miniature portable electronic devices such as pendants and wearable devices. Additionally, the sharing of components or circuit elements for the touch sensor circuitry with the display circuitry can require time-multiplexing and hence, limited capability for simultaneous touch detection and display. 
     Examples of the disclosure are directed to adding multi-touch functionality to an OLED display without the need of a separate multi-touch panel or layer overlaying the OLED display. The OLED display, display circuitry, touch sensors, and touch circuitry can be formed on a Silicon substrate. By fabricating the integrated OLED display and touch sensor panel on a Silicon substrate, extremely high pixels per inch (PPI) can be achieved. For example, an OLED display formed on a glass or plastic substrate can achieve 300-500 PPI, whereas an OLED display formed on a Silicon substrate can achieve 3000 PPI. Due to the extremely high PPI, the pixels used to display an image can be formed next to the touch sensors instead of overlaying the display device behind the touch sensors, leading to thinner and more lightweight devices. Additionally, the semiconductor industry has already developed advanced processes for electronic components and circuitry on Silicon substrates. The maturity and existing capabilities of the advanced processes on Silicon substrates can lead to higher yields and cheaper manufacturing costs. 
     The display and touch functionality can be implemented on the same circuit, so they can be synchronized. Any noise resulting from the display functionality may not detrimentally affect the touch functionality and vice versa. The ability to dedicate separate components to the display pixels and separate components to the touch sensors can be more effective at reducing noise through the use of shielding components. Additionally, separate components for display and touch can lead to multi-functional capability, where the panel can display an image and sense a touch simultaneously or at a same time. 
       FIGS. 1A-1C  illustrate systems in which examples of the disclosure can be implemented.  FIG. 1A  illustrates an exemplary mobile telephone  136  that can include a display and touch screen  120 .  FIG. 1B  illustrates an exemplary media player  140  that can include a display and touch screen  120 .  FIG. 1C  illustrates an exemplary tablet computing device  148  that can include a display and touch screen  120 . The display and touch screens  120  in  FIGS. 1A-1C  can include one or more touch sensor panels with integrated Silicon-OLED displays according to examples of the disclosure. 
     The touch and display screen can include one or more touch sensors forming an array of touch sensors under a touch and display surface (e.g., cover glass or cover material). The detection of a touch event by one or more touch sensors can be sensed by sense circuitry and processed or otherwise interpreted. The array of touch sensors can have touch sensing locations and can form a touch sensitive surface. In some examples, the touch sensors are capacitive touch sensors. However, the claimed subject matter is not limited to capacitive touch sensing technology. Accordingly, many different configurations, touch sensing technologies, or various manufacturing processes can be employed without departure from or with respect to claimed subject matter scope. It is, therefore, understood that any or all configurations, technologies, or processes, or the like, are intended to fall within the scope of claimed subject matter. What is provided herein are simply illustrative examples thereof. For example, a touch sensor configuration can utilize, but is not limited to, touch sensing technologies that employ resistive, optical, surface acoustic, self-capacitance, mutual capacitance, or any combinations therefore, just to name a few. 
     The array of touch sensors having respective touch sensing locations can include one or more patterns of conductive traces (e.g., drive and sense lines) arranged in a manner so as to sense a change in capacitance which can be occasioned by an object, such as a finger or stylus, touching, contacting, or hovering over or on the touch surface. A touch sensitive surface can include an array of touch sensors at particular touch points or touch locations. For example, an array of touch sensor can be formed from a pattern of conductive traces. As an object approaches a touch sensitive surface, one or more touch sensors of the configuration at particular touch sensing points or locations can experience a change in capacitance or resistance from a proximity to an object. By detecting a change in capacitance or resistance at one or more touch sensing points or locations, and by noting the particular location or position associated with the change in capacitance or resistance, a sensing circuit can detect and register one or more touch events, such as, for example, an image of touch. After being detected and registered, touch events can be processed or otherwise used at least in part to control operation of an electronic device, such as for one or more operations of the mobile telephone  136 , media player  140 , and tablet computing device  148  of  FIGS. 1A-1C , by way of example. 
     Although several different examples are possible, configurations or arrangements for use in touch sensor panels can include mutual-capacitance sensing, self-capacitance, and resistive sensing. In mutual capacitance sensing, capacitance between drive and sense lines can be measured. In a self-capacitance sensing, for example, capacitance can be measured relative to some reference, such as a ground or ground plane. In resistive sensing, a change in current when two electrodes or plates come into contact can be measured. Accordingly, mutual capacitance sensing, self-capacitance sensing, and resistive sensing can have similar common aspects with respect to structural or electrical arrangements employed. 
     In mutual capacitance sensing, for example, sensing locations can be formed by a crossing of patterned conductors formed from spatially separated conductive lines or traces. In some examples, conductive traces can lie in substantially parallel planes, the conductive traces of a particular plane being referred to as being substantially co-planar. Furthermore, substantially co-planar conductive traces can be oriented to be substantially parallel. However, conductive traces from different planes can be oriented so as to be substantially perpendicular in direction. That is, substantially co-planar conductive traces lying in a first plane having a first orientation or direction can be substantially perpendicular to substantially co-planar conductive traces lying in a second plane or in another plane having a second orientation or direction. 
     For example, in one example, drive lines can be formed on a first layer in a first direction and sensing lines can be formed on a second layer in a second direction substantially perpendicular to the first direction such that drive and sense lines can “cross” one another at various sensing locations, albeit the drive lines being on a different layer than the sense lines. It is noted herein that for purposes of this disclosure, the term “on” is not intended to necessarily refer to directly on. For example, a second layer can be formed on a first layer without the two layers being in direct physical contact. Thus, there can, continuing with the example, be additional layers or other materials between these first and second layers. Notwithstanding the examples provided above, it should be understood that other non-perpendicular (e.g., non-orthogonal) orientations of the traces in the two planes are also possible. 
     Multiple arrangements or configurations are also possible to provide capacitance sensing, although claimed subject matter is not intended to be limited to any particular one. For example, conductive traces can be formed on different sides of a substrate. Conductive traces, that can include shapes such as diamonds that cross in the manner discussed above, can also be formed on one side of a substrate with an insulating separation, such as a dielectric, separating the traces at crossover locations. Conductive traces can also be formed on different substrates with the substrates being oriented so that the conductive traces lie in different substantially parallel planes while being on different layers. Employing a separation between drive and sense lines can result in capacitive coupling or capacitively coupled nodes between sense lines and drive lines at common locations or crossing location that otherwise lie in different substantially parallel planes, as described above. In such examples, these capacitively coupled locations can form an array of touch sensors. 
     In some examples, the device can measure an applied touch force or pressure. The touch sensor panel can include a drive layer, a sense layer, and conductive paths on the drive layer and sense layer. The touch sensor panel can further include a deformable member such as a dielectric spring layer or raised structures that separate the drive layer and sense layer. As a user applies a pressure or touches the panel, the conductive paths on the drive layer and sense layer can be brought closer together and can compress the deformable member. Bringing the drive layer and sense layer closer together can cause a change in separation and a change in mutual capacitance between conductive paths on the drive layer and sense layer. The change in capacitance can be indicative of the amount, intensity, and/or strength of the force applied. Although the above examples describes force detection using a dielectric spring layer, deformable member, and raised structures, examples of the disclosure can include any number of different force detection mechanisms such as pressure-sensitive ink members and dedicated force sensors. 
     In another example, an array of touch sensors can be formed from conductive traces and shapes such as patches and columns formed on the same layer on the same side of a substrate in a single-sided ITO (SITO) configuration, for example. In a SITO configuration, the drive lines can be formed from a row of patches of conductive material that can be coupled through conductive traces and metal in the border areas of the panel. The sense lines can be formed as columns or connected patches of conductive material. Other SITO configurations are also possible. Therefore, claimed subject matter is not limited in scope to this particular description. In some SITO examples, electrical activation or stimulation of a drive line can result in mutual capacitance between adjacent drive and sense line patches or columns, for example. A finger or other object can result in a change in this mutual capacitance that can be detected by sensing circuits. In some examples, the array of touch sensors can be formed on different sides of a substrate or on different substrates such as in a double-sided ITO (DITO) configuration. 
     Self-capacitance sensing, in contrast, can measure capacitance relative to a reference ground plane. A self-capacitance example typically employs an array or other arrangement of conductive patches or pads, such as Indium Tin Oxide (ITO) pads or patches. It is noted, without limitation, that ground plane can be formed on the back side of a substrate, on the same side as an array of conductive pads or patches, but separated from the patches or pads, or on a separate substrate. We likewise note that claimed subject matter is not limited in scope to ITO. Rather, any transparent conductive material, such as, for example, Zinc Tin Oxide (ZTO), can likewise be employed or any combinations thereof. In a self-capacitance touch sensor, self-capacitance of a sensor relative to the reference ground can be changed due to at least in part to the presence of an object, such as a finger. In some self-capacitance examples, self-capacitance of conductive column traces, for example, can be sensed independently, and self-capacitance of conductive row traces can also be sensed independently. 
     Resistive sensing can detect a touch based on a change in measured current. A resistive touch sensor can employ a drive layer and a sense layer arranged so that the conductive paths on the drive layer overlap with the conductive paths of the sense layer, thereby forming capacitors whose plates (e.g., conductive paths) are separated by air. When a touch pad is touched, the conductive paths on the drive layer and sense layer come into contact causing a change in resistance (can be measured as a change in current) that can be used to identify where the touch event occurred. 
     As shall be explained in greater detail, an OLED stack can be employed to project one or more images. The arrangement, for example, can allow a user to make selections or move a cursor, such as touching a portion of a touch sensitive surface with an object (e.g., a finger), or by placing an object in close proximity to the surface. In general, a touch sensitive surface can recognize and electronically register a touch or other direct physical contact or a near-touch with the touch sensitive surface via the touch sensors coupled to processing components or circuitry within the portable electronic device capable of processing such actions, gestures or surface contacts. Therefore, a computing system including circuitry or processors, for example, can interpret the registered touches or near-touches and perform an action based at least in part on processing by the computing system. In some examples, the interpreted touch data can result in a processor or other circuit electrically activating pixels of the array to change the display. 
     OLEDs can provide potential advantages over possible alternative display technologies, such as LCD and LED displays. OLED displays can be thinner, lighter, and more flexible than other types of displays with faster response times (e.g., higher refresh rates). OLED displays do not require a back light since the light can be generated from the organic light emitting (OLE) material itself, which allows a pixel to be turned completely off. As a result, OLED displays can have a higher contrast ratio and can display images that are more vibrant. Additionally without the need for a backlight, OLED displays can consume much less power. Due to the OLE material producing its own light, the OLED displays can also have a wider viewing angle. This can be in comparison to LCDs, which work by blocking light that can lead to obstruction of certain viewing angles. Furthermore, OLEDs have a wider operating temperature range, unlike LCDs which include a liquid crystal material that cannot operate at extreme temperatures. 
     There are several types of OLEDs including, but not limited to, passive-matrix OLEDs (PMOLEDs), active-matrix OLEDs (AMOLEDs), transparent OLEDs, cathode-common OLEDs, anode-common OLEDs, White OLEDs (WOLEDs), and RGB-OLEDs. The different types of OLEDs can have different uses, configurations, and advantages. Examples of the disclosure can include any of the types of OLEDs and are not limited to one type. The principle of how an OLED works is generally the same for all types of OLEDs, and will be discussed below. 
       FIGS. 2A-2B  illustrate cross-sectional views of exemplary OLED display stacks. An OLED display can be a display device that emits light using a process called electroluminescence. Electroluminescence is a phenomenon where a material can emit light in response to an electric current passing through the material. The OLED stack can include a stack of material layers through which each pixel or subpixel can be controlled using a matrix of transistors or switches. In an OLED stack, the material that emits light is known as the emissive layer. Coupling the emissive layer with a conductive layer, an electric current can pass through the OLED stack. The OLE material can be an organic polymer or small molecules. Polymers for the emissive layer can include, but are not limited to, Polyphenylenevinylene and Polyfluorene. Polymers for the conductive layer can include, but are not limited to, Polyaniline and Polyethylenedioxythiophene. The emissive layer and conductive layer can be coupled to an anode and a cathode. The anode and cathode can couple to a source of electricity such as a battery or power supply. 
     Referring to  FIG. 2A , OLED stack  250  can include a cathode  212 , an emissive layer  214 , a conductive layer  216 , and an anode  218  disposed on a glass or plastic substrate  202 . A battery or power supply  260  can be coupled to the cathode  212  and anode  218 , and a current can be applied across the OLED stack  250 . As a current is applied across the OLED stack  250 , the electrical current can flow from the cathode  212  to the emissive layer  214 , supplying electrons to the emissive layer  214  and causing the emissive layer  214  to become negatively charged. The anode  218  can remove electrons from the conductive layer  216 , leaving behind holes in the conductive layer  216  that can be filled with electrons and causing the conductive layer  216  to be positively charged. This scenario leaves an excess of electrons in the emissive layer  214  and an excess of holes in the conductive layer  216 . Electrostatic forces can cause electrons from the positively charged conductive layer  216  to recombine with the holes in the negatively charged emissive layer  214 . As the electrons and holes recombine, they release extra energy in the form of a photon generating light  280 . 
     In some examples, the OLED stack can include hole injection layers (HIL), hole transport layers (HTL), electron injection layers (EIL), emissive layers (EML), and electron transport layers (ETL). The color of the light  280  emitted can depend on the type of OLE material (used for the emissive layer  214 ). The different emission colors can be obtained with a variety of chemical structures of the organic material. The intensity of light (e.g., brightness of the OLED display) can depend on the number of emitted photons or the current applied from the battery  260 . 
     Depending on the OLED configuration and the OLE material, the OLED stack  250  can include one or more color filters.  FIG. 2A  illustrates an exemplary White OLED (WOLED) structure. In a WOLED structure, the OLE material (emissive layer  214 ) can generate white light. One or more color filters can be used to filter out different colors. For example, red color filter  224  can filter out all colors except red. Green color filter  226  can filter out all colors except green, and blue color filter  228  can filter out all colors except blue. In some examples, color filters  224 ,  226 , and  228  can be formed using a cholesteric filter material such as a multilayer dielectric stack that includes materials with different indices of refraction configured to form an optical filter.  FIG. 2B  illustrates an exemplary RGB OLED stack. In a RGB OLED stack, different OLE materials can be used to emit the different colors. For example, emissive layer  232  can be formed of an OLE material that emits red light  282 , emissive layer  234  can be formed of an OLE material that emits green light  284 , and emissive layer  236  can be formed of an OLE material that emits blue light  286 . 
       FIG. 3A  illustrates a cross-sectional view,  FIG. 3B  illustrates a top view, and  FIG. 3C  illustrates a flow diagram for forming an exemplary integrated OLED display and touch sensor panel fabricated on glass or plastic. Device  300  can include a substrate  302 , such as plastic or glass, provided in step  362  of process  360 . In step  364 , an array of transistors  304  can be formed on substrate  302 . Transistors  304  can be, for example, thin-film transistors (TFTs) used to drive the subpixels (red subpixel  353 , green subpixel  355 , and blue subpixel  357 ) of the OLED stack  350 . In step  366 , an insulating layer  306  can be formed on substrate  302  to reduce electrical interference for the array of transistors  304  or other electrical components within the structure. In step  368 , a planarization layer such as planarization layer  308  can be optionally formed on the insulating layer  306  to form a substantially planar surface for subsequent deposition, patterning, or other fabrication processes. Vias such as via  310  can be formed in the planarization layer  308  and insulating layer  306  in step  370 . In step  372 , vias  310  can be filled with a conductive material, such as metallization. One or more metallization layers  330 , vias  310 , and insulating layers  306  can be formed for routing traces and other circuitry in step  374 . In step  376 , a metallization layer can be disposed on the planarization layer to form cathode  312 . A layer of organic light emitting (OLE) material for the emissive layer  314  can be applied or deposited on cathode  312  in step  378 . Conductive layer  316  can be deposited on emissive layer  314  in step  380 , and a metallization layer can be disposed on conductive layer  316  to form an anode  318  in step  382 . In step  384 , another metallization  320  can be disposed on anode  318 . Metallization  320  can be used to couple power or ground to anode  318 . Additional layers can be disposed on anode  318  and metallization layer  320  such as passivation layers and shielding layers. In step  386 , insulating layer  340  can be disposed on the additional layers and anode  318  to electrically isolated and protect the OLED stack  350 . In step  388 , touch sensors  342  can be deposited on metallization  320  and insulating layer  340  and patterned to form drive lines and sense lines. Touch sensors  342  can be any transparent conductive material such as ITO. Red color filter (CF)  324 , green CF  326 , and blue CF  328  can be disposed on touch sensors  342  and insulating layer  340  in step  390 . In step  392 , adhesive layer  344  can be disposed on red CF  324 , green CF  326 , and blue CF  328  and can be used for adhering a cover glass  346 . Cover glass  346  can be adhered to or integrated with the touch and display screen in step  394 . Cover glass  346  can be glass or any cover material that can protect the device  300  from damage and degradation. 
     While an integrated touch and OLED display panel can be formed by overlaying a touch sensor array over the OLED display, a brightness of the images displayed by the OLED stack  350  can be compromised. Although the touch sensors  342 , insulating layer  340 , adhesive  344 , and cover glass  346  are made of a transparent materials, these materials are not entirely transparent, and therefore the quality of a displayed image can degrade as the display is located further away from the display surface (e.g., when components of the device such as the touch sensors  342  overlay the OLED stack  350 ). Furthermore, as shown in  FIG. 3B , the drive lines  343   a  and sense lines  343   b  for the touch sensors  342  can cause optical artifacts. Additionally, the extra layers for the touch sensors  342  and insulating layer  340  can lead to added overall thickness of the device  300 . 
     To alleviate or overcome one or more of the above mentioned issues with the integrated touch and OLED display panel as exemplified in  FIGS. 3A-3C , the OLED stack and touch sensors can be formed on a Silicon substrate.  FIG. 4A  illustrates a cross-sectional view,  FIG. 4B  illustrates a top view, and  FIG. 4C  illustrates a flow diagram for forming an exemplary integrated Silicon-OLED display and touch sensor panel. Device  400  can include a Silicon substrate  403 , provided in step  462  of process  460 . Silicon substrate  403  can be planar or curved. In step  464 , an array of transistors  404  can be formed on substrate  403 . Array of transistors  404  can be, for example, thin-film transistors (TFTs) used to drive subpixels  453 ,  455 , and  457  and/or can be used for touch sensing circuitry. In step  468 , one or more insulating layers  406 , metallization layers  430 , and vias  410  can be formed on substrate  403  for additional circuitry and/or to form connections to circuitry. 
     In a pixel location  454 , red subpixels  453 , green subpixels  455 , and blue subpixels  457  can be formed. Subpixels  453 ,  455 , and  457  can include a metallization layer to form a cathode  412  on the one or more insulating layers  406 , metallization layers  430 , and vias  410 . Cathode  412  can be formed in step  470 . An emissive layer  414  can be disposed or deposited on cathode  412  in step  472 , and a conductive layer  416  can be disposed on the emissive layer  414  in step  474 . In step  476 , a metallization layer can be disposed on the OLE material or emissive layer  414  to form anode  418 . The cathode  412 , emissive layer  414 , conductive layer  416 , and anode  418  can be included in the OLED stack  450 . In step  478 , another metallization  420  can be disposed on anode  418  to couple the anode  418  to power or ground. In step  480 , color filters such as red CF  424 , green CF  426 , and blue CF  428  can be disposed on anode  418  in the pixel location  454 . In some examples, a white OLED can be fabricated using the appropriate OLE material and different red, green, and blue color filters can be disposed over the white OLE material, as shown in  FIG. 4A . In some examples, an RGB OLED can be fabricated using separate OLE materials for the different colors. Color filters can optionally be used. 
     Due to the capability of achieving an extremely high number of pixels per inch (PPI) when forming the OLED stack on a Silicon substrate, the subpixels for displaying an image can be formed on a same layer as the touch sensor array. In a touch location  456 , one or more touch sensors such as touch plate  443  can be formed on the same layer as the anode  418  of the OLED stack (step  482 ). Touch plate  443  can be coupled to touch sensing circuitry by using routing traces  441  and vias  410 . In some examples, routing traces  441  for touch sensing circuitry and the touch plate  443  can be formed on the same layer as the anode  418  in a border area of the device. In some examples, touch plate  443  can be coupled to a transistor  404 . As will be described shortly, coupling the touch plate  443  to a transistor  404  can be used to switch the touch sensors on or off or can be used to couple touch sensors together. In steps  484  and  486 , an adhesive  444  can be disposed and a cover glass  446  can be adhered to the device  400 . 
     The one or more layers described above and below can be deposited using any number of techniques including, but not limited to, screen printing, spin-on coating, spray coating, roll-to-roll web coating, physical vapor deposition, chemical vapor deposition, or other suitable deposition techniques. The one or more layers described above and below can be patterned using any number of patterning techniques, including, but not limited to, laser ablation, chemical acid etching, dry etching, shadow masking, and photolithography/resist processes. 
       FIG. 4B  illustrates a top view of device  400 . A display pixel can include a red subpixel  453  (referred to as “R”), a green subpixel  455  (referred to as “G”), and a blue subpixel  457  (referred to as “B”). Display subpixels can be located next to touch plate  443  (referred to as “T”). Both the display subpixels and touch sensors of the integrated Silicon-OLED display and touch sensor panels can be located at the touch and display surface. Locating both the display subpixels and touch sensors at the touch and display surface can enhance the user&#39;s viewing experience without compromising touch sensitivity. Additionally, optical artifacts from the touch sensors can be reduced or eliminated. 
       FIG. 5  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel including an integrated electrostatic discharge device. Electronic devices, in general, can be susceptible to electrostatic discharge (ESD) events, which can be caused by external objects imparting electrostatic energy onto the device. In the instance of touch input devices, ESD events can generate a “false touch” on the touch screen; in other words, the device can think that a touch or proximity event has occurred when none exists. Furthermore, ESD events can also cause a device to ignore an actual touch or proximity event. For example, mutual capacitance touch sensor panels can be formed from a matrix of drive and sense lines of a substantially transparent conductive material such as ITO. The lines can be arranged orthogonally on a substantially transparent substrate. An ESD event can be coupled into the matrix of drive lines and sense lines, causing signals to appear that can be misinterpreted as a touch or proximity event. Also, ESD events can be coupled into the matrix of the drive and sense lines causing signals to appear as negative touches, such that when a touch occurs, it is missed. The false touches or missed touches can lead to an overall degradation of the user experience in that the device will register touches that the user did not intend and furthermore can miss actually touches intended by the user. 
     Device  500  can include a Silicon substrate  503 . An array of transistors  504  can be formed on substrate  503 . Transistors  504  can be, for example, TFTs used to drive subpixels used to display an image. Device  500  can also include one or more insulating layers  506 , metallization layers  530 , and vias  510  formed on substrate  503  to form additional circuitry and/or connections to circuitry. 
     In a pixel location  554 , cathode  512  can be formed on the one or more insulating layers  506 , metallization layers  530 , and vias  510 . An emissive layer  514  can be applied or deposited on cathode  512 . A conductive layer  516  can be disposed on emissive layer  514 , and an anode  518  can be disposed on conductive layer  516 . Another metallization  520  can be disposed on anode  518  to couple anode  518  to power or ground. Color filters such as red CF  524 , green CF  526 , and blue CF  528  can be disposed on anode  518  in the pixel location  554 . In some examples, routing to the matrix of transistors for the display can formed additionally or alternatively in border areas of the device and/or between subpixels. 
     In a touch location  556 , one or more touch sensors such as touch plate  543  can be formed on the same layer as anode  518 . Touch plate  543  can be routed to sensing circuitry using routing traces  541 . In some examples, routing to the touch plate  543  can be formed on the same layer as any one of the metallization layers  530 , insulating layers  506 , layers of the OLED stack  550 , or on the same layer as the color filters  524 ,  526 ,  528 . An adhesive  544  can be applied on color filters  524 ,  526 , and  528  and touch plate  543 . A cover glass or cover material  546  can be adhered to the device  500  using the adhesive  544 . 
     In some examples, an electrostatic discharge device  505  can be coupled to the touch sensor or touch plate  543 . Touch plate  543  can be particularly vulnerable to ESD. Coupling the touch plate  543  to ESD device  505  can include forming additional vias  510  and metallization layers  530  located in the touch location  556 . In some examples, ESD device  505  can be placed in the shortest distance, for example, coupled to via  511 . By placing the ESD device in the shortest distance, damage to other circuitry can be prevented or minimized. 
     In some examples, the touch plates  443  of  FIG. 4A and 543  of  FIG. 5  can be small in size, and the sensitivity for sensing a touch or hover can lead to erroneous or missed touches.  FIGS. 6A-6C  illustrate exemplary Silicon-OLED display and touch sensor panel with enhanced touch sensitivity. Device  600  can include a Silicon substrate  603 , an array of transistors  604 , one or more insulating layers  606 , one or more metallization layers  630 , and one or more vias  610 . In a pixel location  654 , the OLED stack  650  can include a cathode  612 , an emissive layer  614 , a conductive layer  616 , an anode  618 , and color filters CF  625 . Device  600  can further include ESD device  605  coupled to the touch sensors. Routing for the OLED subpixels and touch sensors can be formed in the one or more metallization layers  630 , routing traces  641 , and/or in the border area on the same layer as at least one of the layers of the OLED stack  650 . Device  600  can include an adhesive  644  and cover glass  546 . 
     In the exemplary device  600  of  FIG. 6A , touch sensitivity can be enhanced by locating the touch plate  643  on the same layer as the color filters CF  625 , and closer to the touch and display surface  670 . In some examples, the sensitivity for sensing a touch can be enhanced by increasing the size of the touch plate  643 . In some examples, the sensitivity for sensing a touch can be enhanced by arranging two or more touch plates  643  side by side and electrically coupling multiple touch plates  643  together. 
       FIG. 6B  illustrates a cross-sectional view of an exemplary Silicon-OLED display and touch sensor panel with enhanced touch sensitivity. The touch sensitivity of device  600  can be enhanced with a larger sized touch sensor such as touch sensor layer  660 . Touch sensor layer  660  can have, for example, 2-10 times larger surface area than touch plate  643  of  FIG. 6A . In some examples, the touch sensor layer  660  can have the same area as a display pixel. To electrically isolate touch sensor layer  660  from the anode  618 , an insulating layer  662  can be disposed between the touch sensor layer  660  and the insulating layer  662 . 
     The touch sensitivity of the device can be enhanced even further by locating the touch sensor layer  660  closer to the touch and display surface  670 . Locating the touch sensor layer  660  below the color filters CF  625  can lead to an unwanted gap between the touch object and the touch sensor layer  660 . This unwanted gap can be due to the height of the color filters CF  625  where erroneous touches or decreased touch sensitivity can result. The color filters CF  625  can be, for example, 200 μm in height. As shown in  FIG. 6C , device  600  can include a touch sensor layer  660  disposed on the color filters CF  625  and located closer to the touch and display surface  670  or cover glass  646 . The additional insulating layer, such as insulating layer  662  in  FIG. 6B , can be omitted. Additionally, the parasitic capacitance can be reduced due to locating layers or elements dedicated to the OLED stack  650  close together and locating layers or elements dedicated to touch sensing close together. A conductive via  665  can be formed and filled with metal to couple to routing traces. 
     While the exemplary devices of  FIGS. 6B and 6C  can enhance the touch sensitivity, the quality of perceived image can be compromised due to the touch sensor layer  660  located in the path between the OLED stack and the touch and display surface  670 .  FIG. 6D  illustrates an alternative example of locating the touch sensor closer to the touch and display surface  670 . A conventional display can include a black matrix. A black matrix is an array of opaque conductive elements that can separate individual pixels and can be disposed between the color filters. In some examples, the black matrix can serve as light shielding to prevent color mixing between neighboring subpixels. The black matrix can be an opaque (e.g., black) masking material such as an inorganic opaque material (e.g., chrome) or an organic opaque material (e.g., black ink or black plastic). In some examples, a same black masking material can also be used to form a border mask in the peripheral border area (e.g., a ring surrounding a central active area of the panel). In some examples, device  600  can include multi-functional elements such as touch sensors and black matrix  664 . Touch sensors and black matrix  664  can function as touch sensors and can also function as a black matrix. In some examples, touch sensors  664  can be made of an opaque conductive material. In some examples, touch sensors  664  can be a multi-layer thin film stack such as a two-layer stack with one layer serving as the touch sensors and the other layer serving as a black matrix. 
     The integrated Silicon-OLED display and touch sensor panel can be configured in any number of arrangements.  FIG. 7A  illustrates a close-up top view of an exemplary arrangement of an integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. Device  700  can include a matrix of display subpixels and touch sensors. In some examples, the display subpixels are arranged in groups  751 . Each group of subpixels  751  can include a red subpixel (referred to as “R”), a green subpixel (referred to as “G”), and a blue subpixel (referred to as “B”). Touch sensors  743  (referred to as “T”) can be located between each group of subpixels  751 . For example, a configuration of the integrated Silicon-OLED display and touch sensor panel can include a RGBT/RGBT/RGBT arrangement, as shown in  FIG. 7A . In some examples, the panel can include alternative arrangements, such as a RGBT/RGB/RGBT arrangement or a TGB/RTB/RGT arrangement. 
       FIG. 7B  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel employing mutual-capacitive sensing according to various examples of the disclosure. Device  700  can sense an object such as a finger  799  touching or hover over the display and touch surface  770 . The OLED subpixels  753  can display an image  796 . At a same time or at a different time, drive touch sensors or drive regions  744  can be coupled to drive circuitry  789 . Drive circuitry  789  can transmit drive signals to drive regions  744 . Due to the close proximity of the drive regions  744  to sense regions  746 , electric field lines can form between the stimulated drive regions  744  and the sense regions  746 . When finger  799  touches or near touches in the appropriate region, the finger  799  can block some of the electric field lines extending from the drive regions  744  to the sense regions  746 , thereby reducing the amount of charge coupled to the nearby sense regions  746 . The reduction in charge can be sensed by sense circuitry  787 , coupled to the sense regions  746 , as an “image” of touch. The touch image can be transmitted to a touch controller for further processing. Drive regions  744  and sense regions  746  can be any type of touch sensor such as touch plate  643  and touch sensor layers  660  of  FIGS. 6A-6D . 
     When finger  799  is removed from the proximity of the drive region  744  and the sense region  746 , the charge emanating from the drive region  744  may no longer partially coupled onto finger  799 . Thus, the amount of charge coupled onto sense region  746  can increase. Finger  799  generally can only couple charge from the drive region  744  if it is touching or in near proximity to the drive regions  744  and sense regions  746  and blocking some electric field lines. Once the finger is moved away from the proximity of the drive regions  744  and sense regions  746  and is a certain distance away, the charge may no longer coupled onto finger  799 . The sense regions  746  can no longer detect the presence of the finger  799 , and sense regions  746  will not register a touch or proximity event. Thus, touch sensors employing mutual capacitance sensing can have limited range of distance over which the system can detect proximity events. 
     Touch sensors that employ self-capacitance to detect touch or proximity events can be used to detect the presence of a finger or object that is further away from the touch sensors than in a device that uses mutual capacitance.  FIG. 7C  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel employing self-capacitive sensing according to various examples of the disclosure. Device  700  can sense an object such as finger  799  touching or hovering over the touch and display surface. OLED subpixels  753  can display an image  796 . Touch sensors or sensing electrodes  743  can be coupled to sense circuitry  787  and can have a self-capacitance to ground. When finger  799  touches or is in close proximity to sensing electrodes  743 , an additional capacitance can be formed between the sensing electrodes  743  and ground through finger  799 . The additional capacitance can increase the self-capacitance of the sensing electrodes  743 . This change in self-capacitance of the sensing electrodes  743  can be detected by sense circuitry  787 . Unlike the exemplary mutual capacitance device of  FIG. 7B , each sensing electrode  743  can act as a touch node instead of having pairs of drive regions  744  and sense regions  746 . As a result, such a self-capacitance architecture can possess a touch resolution that can be less than the mutual capacitance touch resolution. 
     Since the self-capacitance architecture can have a reduced spatial resolution when compared to a mutual capacitance architecture, a self-capacitance touch sensor panel may not be able to detect a touch or proximity event location with as much accuracy or ambiguity as a mutual capacitive touch sensor panel. However, due to the high PPI of the integrated Silicon-OLED display and touch sensor panel, the number of sensing electrodes for the self-capacitive device of  FIG. 7C  can lead to a resolution that can be comparable or greater than the resolution of both conventional mutual-capacitive and self-capacitive touch sensor panels (e.g., a self-capacitance touch sensor panel formed on a glass or plastic substrate). 
     In some examples, the density of touch sensors can be large enough such that an object touching or hover over the touch and display surface can couple to more than one touch sensor. To conserve on power, multiple groups of subpixels and touch sensors can be grouped together into clusters. For example, as illustrated in  FIG. 7A , cluster  780  can include 15 groups of subpixels  751  and touch sensors  743 , and cluster  782  can include 15 different groups of subpixels  751  and 15 different touch sensors  743 . Touch sensors  743  belonging to the same cluster can be coupled together at location  784  and routed using routing trace  786  to touch controller  788 . Touch controller  788  can sense a touch or hover at any one of the touch sensors  743  in a cluster. Signals to the touch sensors can be routed through routing traces, vias, and one or more of the underlying metallization layers (such as routing traces  641  of  FIGS. 6A-6D ). 
       FIG. 7D  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel including a plurality of clusters. Device  700  can include a plurality of clusters such as cluster  780  and cluster  782 . Each cluster can have a X, Y coordinate value corresponding to a touch location. The plurality of clusters can be coupled to touch controller  788 . The touch controller  788  and a processor can drive and sense the plurality of clusters sequentially or concurrently to form an image of touch. 
     Due to the high PPI, multiple touch sensors can be distributed throughout the panel without being noticed. In some examples, the placement of the groups of subpixels  751  can be staggered to prevent the touch sensors  743  from forming a visually noticeable pattern (such as the line of touch sensors  790  of  FIG. 7A ), as exemplified in  FIG. 7E . In some examples, routing traces  786  for the touch sensors  743  can formed on the same plane as the groups of subpixels  751  and touch sensors  743  and in an area between the rows and/or in other outside areas (e.g., border areas of the device). 
     In some examples, groups of clusters can be coupled together.  FIG. 7F  illustrates a plan view of an exemplary integrated Silicon-OLED display and touch sensor panel including a plurality of clusters coupled together. Device  700  can include a plurality of clusters such as cluster  780  and  782 . Device  700  can include a switching matrix  708  coupled to the touch controller  788 . One or more clusters can be coupled to a switch in the switching matrix  708 . For example, cluster  780  can be coupled to switch  707 , and cluster  782  can be coupled to switch  709 . Cluster  780  and cluster  782  can be coupled together through switch  707  and switch  709 . In some examples, device  700  can include fewer number of switches than clusters. In some examples, switches  707  and switch  709  can be directly connected to touch sensors within a cluster. In some examples, switches  707  and  709  can be included in the array of transistors (such as array of transistors  604  of  FIGS. 6A-6D ) and coupled to the touch sensors (such as touch plate  643  of  FIGS. 6A-6D ) and/or display subpixels (such as subpixels included in OLED stack  650  of  FIGS. 6A-6D ). In some examples, ESD device  605  can be replaced with switch  707 , or switch  707  can be disposed next to ESD device  605 . 
     By coupling multiple clusters together, the touch and/or display granularity or resolution can be dynamically changed and/or can be used to minimize power consumption through touch controller  788 . The coupled clusters can be driven and sensed sequentially or concurrently. In some examples, the touch and/or display granularity can be dynamically changed across the entire area of the screen. In some examples, the touch and/or display granularity can be dynamically changed in some, but not all, portions of the screen. In some examples, touch and/or display granularity can be changed by coupling together, for example, every other row, every other column, every third row, and/or every third column. In some examples, touch and/or display granularity can be changed by coupling together rows, but not columns or vice versa. While  FIG. 7E  illustrates switch  707  located on a different layer than clusters  780  and  782 , examples of the disclosure can include switches located on the same layer in a different area of the panel such as a border area. Examples of the disclosure can include switches, transistors, or wired connections. 
     The extremely high PPI can also allow the integrated Silicon-OLED display and touch sensor panel to accommodate for additional components and circuitry.  FIG. 8A  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel including a photodiode. Device  800  can include a Silicon substrate  803 . An array of transistors  804  can be formed on substrate  803 . The array of transistors  804  can be, for example, TFTs used to drive the subpixels to display an image and/or TFTs used to couple to the touch sensors for reduced granularity. Device  800  can also include one or more insulating layers  806 , metallization layers  830 , and vias  810  formed on substrate  803  for additional circuitry and/or connections to circuitry. 
     In a pixel location  854 , cathode  812  can be formed on the one or more insulating layers  806 , metallization layers  830 , and vias  810 . An emissive layer  814  can be applied or deposited on cathode  812 . A conductive layer  816  can be disposed on emissive layer  814 , and an anode  818  can be disposed on the conductive layer  816 . Another metallization  820  can be disposed on anode  818  to couple anode  818  to power or ground. Color filters CF  825  can be disposed on anode  818  in the pixel location  854 . In some examples, routing to the array of transistors  804  for the subpixels can be formed additionally or alternatively in the border areas of the device and/or between subpixels. 
     In a touch location  856 , one or more touch sensors such as touch sensor  843  can be formed on the same layer as the color filters CF  825 . In some examples, touch sensor  843  can be formed on the same layer as the color filters CF  825  near the touch and display surface  870 . Touch sensor  843  can be routed to sensing circuitry using routing traces  841 . In some examples, routing to touch sensor  843  can be formed on the same layer as any one of the metallization layers  830 , insulating layers  806 , or layers of the OLED stack  850 . An ESD device  805  can be coupled to the touch sensor  843 . In some examples, the ESD device  805  can be replaced with a switch. In some examples, device  800  can include both ESD device  805  and a switch. Device  800  can include a photodiode  808 . Photodiode  808  can be used to capture an image located in or near imaging area  872 . In some examples, photodiode  808  can be disposed near the ESD device  805  and/or switch. Photodiode  808  can be located on the same plane as any of the layers such as the same layer as the array of transistors  804 . For enhanced touch sensitivity, some examples can include touch sensor  843  extended over the imaging area  872  of the photodiode  808 . In some examples, photodiode  808  can be coupled to a switch and the resolution of an image captured by a plurality of photodiodes in device  800  can be dynamically changed. 
       FIGS. 8B-8C  illustrate a top view of an exemplary integrated Silicon-OLED display and touch sensor panel including photodiodes. Touch sensors  843  can be arranged next to or near photodiodes  808  to increase the sensing capacitance and enhance the touch sensitivity. Groups of subpixels  851 , touch sensors  843 , and photodiodes  808  can optionally be included in cluster  880 . Anode  818  can be disposed in the pixel locations and can be coupled together (not shown) so that proper biasing can be applied from the edge of the display or from one or more underlying metallization layers.  FIG. 8B  illustrates an exemplary arrangement of red subpixels (referred to as “R”), green subpixels (referred to as “G”), blue subpixels (referred to as “B”), touch sensors (referred to as “T”), and photodiodes (referred to as “P”) in a pattern of RGB-TP/RGB-TP.  FIG. 8C  illustrates an exemplary staggered arrangement. Other arrangements such as RGB-RTP/RGB-TPB can be used. 
     In some examples, photodiode  808  can be used for near-field imaging. The near-field imaging can be used for sensing touches detected through a user&#39;s glove or other barriers such as oils, gels, and moisture. Thereby, photodiode  808  can increase the sensing capability and enhanced touch sensitivity. In other examples, near-field imaging using photodiode  808  can be used for detecting a fingerprint image. 
       FIG. 9A  illustrates a cross-sectional view of an exemplary integrated Silicon-OLED display and touch sensor panel with fingerprint detection. Device  900  can include an OLED stack  950 , components  909 , color filters CF  925 , photodiode  908 , and touch sensors  943  disposed on Silicon substrate  903 . Components  909  can include, but are not limited to, an array of transistors, vias, insulating layers, ESD devices, switches, and metallization layers. An object, such as finger  999 , can touch or swipe the touch and display surface  970  of device  900 . Photodiodes  908  can be used to detect a fingerprint image using near-field imaging. Near-field imaging allows for arbitrarily small details to be resolved, and can be well-suited for fingerprint detection. Photodiodes  908  can be any type of fingerprint reader such as, but not limited to, optical finger print readers or thermal finger print readers. Finger  999  can include ridges  998  and valleys  997  (areas between ridges  998 ), and photodiode  908  can use light to capture an image of the fingerprint. The ridges  998  of the finger can reflect more light, and the valleys  997  can reflect less light. In some examples, photodiodes  908  can use the difference in index of refraction or light reflection to differentiate between ridges  998  and valleys  997  (e.g., air). Photodiodes  908  can generate a black and white image of the fingerprint. 
     In some examples, device  900  can include discrete components for the OLED subpixels to display one or more images, touch sensors to sense a touch or hover, and photodiodes to capture a fingerprint image, thereby allowing the device to operate one or more of the three functionalities simultaneously. For example, the near-field imaging photodiode  908  can be used in conjunction with touch sensor  943 . In some examples, photodiode  908  can be used to read a fingerprint image when a touch panel cannot use capacitive fingerprint sensing. For example, touch panels using pixelated self-capacitance may not have enough spatial resolution to read a fingerprint. In such an example, photodiode  908  can be placed near or next to the pixelated self-capacitance touch pads to allow the touch panel the capability to read both a fingerprint image and detect a touch activity while displaying an image using the OLED subpixels. In some examples, device  900  can include a plurality of photodiodes such as photodiode  908  configured for capturing an image or scanning a document. 
       FIG. 9B  illustrates an exemplary flowchart for capturing a near-field image from photodiodes in an integrated Silicon-OLED display and touch sensor panel according to examples of the disclosure. Flow  960  can begin with displaying a prompt on the screen through the display subpixels. The prompt can request the user to login by touching the screen or a button with their finger (block  962 ). The device can check that the user&#39;s finger is held steady and a touch is detected for more than a predetermined amount of time (block  964 ). After the check is successful, the device can activate one or more photodiodes (block  966 ). A fingerprint image can be acquired using the one or more photodiodes in block  968 . The device can check if the fingerprint is a match (block  970 ). If the fingerprint image is a match, the device can unlock and allow the user access to the device (block  972 ). During one or more of the illustrated blocks, a fingerprint image can be detected by exclusively using the one or more activated photodiodes so the device can conserve power by deactivating the touch sensors. Additionally, the device can further conserve power by waiting until block  966  to activate or power on the photodiodes. 
     In some examples, the photodiode can detect near-infrared wavelengths.  FIG. 10A  illustrates a cross-sectional and  FIG. 10B  illustrates a top view of an exemplary integrated Silicon-OLED display and touch sensor panel with a near-infrared detector. Device  1000  can include a Silicon substrate  1003 . An array of transistors  1004  can be formed on substrate  1003 . The array of transistors  1004  can be, for example, TFTs used to drive the subpixels to display an image or switches coupled to the touch sensors for changing the touch granularity. Device  1000  can also include one or more insulating layers  1006 , metallization layers  1030 , and vias  1010  formed on substrate  1003  for additional components  1009 , circuitry and/or connections to other circuitry. 
     In a pixel location  1058 , OLED stack  1050  can be formed to display images. OLED stack  1050  can include cathode  1012  formed on the one or more insulating layers  1006 , metallization layers  1030 , and vias  1010 . An emissive layer  1014  can be deposited on cathode  1012 , and a conductive layer  1016  can be disposed on emissive layer  1014 . Anode  1018  can be disposed on conductive layer  1016 , and a metallization (not shown) can be disposed on anode  1018 . Metallization can be configured to couple anode  1018  to power or ground. One or more color filters CF  1025  can be disposed on anode  1018  to filter the appropriate color(s). 
     In a touch location  1056 , one or more touch sensors such as touch sensor  1043  can be formed. Touch sensor  1043  can detect a touch or hover at the touch and display surface  1070 . Touch sensor  1043  can be routed using routing traces in a border area or using routing traces in an underlying plane. Optionally, device  1000  can include an ESD device or switch. 
     Device  1000  can also include a near-infrared (NIR) detector  1011 . The NIR detector  1011  can be configured for optically-assisted touch. Optically-assisted touch can improve the touch performance by measuring a user&#39;s touch or hover using the NIR detector  1011  in addition to using capacitive or resistive touch sensing with touch sensor  1043 . Device  1000  can include a NIR color filter (NIR CF)  1027  disposed on the OLED stack  1050  in a location of a NIR emitter  1059  and NIR detector  1011 . 
       FIG. 10B  illustrates a top view of device  1000 . A display pixel can include a red subpixel  1053  (referred to as “R”), a green subpixel  1055  (referred to as “G”), a blue subpixel  1057  (referred to as “B”), and near-IR emitter  1069  (referred to as “I”). Display subpixels can be located next to touch sensor  1043  (referred to as “T”) and near-IR detector  1019 . 
     As illustrated in  FIG. 10C , light  1052  can be light emitted from the OLED stack  1050  that propagated through CF  1025  and can be used to display an image  1096 . Light  1054  from NIR emitter  1059  can be light emitted from the emissive layer (apart of the OLED stack  1050 ) that propagated through NIR CF  1027  and can be used for optically-assisted touch. NIR CF  1027  can filter out wavelengths of light outside the near-infrared wavelength range, and as a result, the user may not be able to visually see light  1054 . When an object such as finger  1099  is touching or hovering over the touch and display surface  1070 , light  1054  can reflect off the surface of finger  1099 . The reflected light can pass through another NIR CF  1027  located above the NIR detector  1011  and can be detected using NIR detector  1011 . In some examples, the NIR detector  1011  can be used to acquire a fingerprint image. 
     In some examples, the touch sensing capability of device  1000  can be optical only touch sensing. Device  1000  can use NIR detector  1011  and NIR CFs  1027  for optical only detection. Device  1000  can include a cover glass or cover material  1046  adhered to the OLED stack  1050  and touch sensors  1043  using adhesive  1044 . Cover glass  1046  can act or can be configured to act as a light guide to enhance the performance and sensitivity of the optical touch sensing. 
       FIGS. 10D-10E  illustrate a top view of an exemplary integrated Silicon-OLED display and touch sensor panel including near-field imaging photodiodes, NIR detectors, and NIR emitters. One or more touch sensors  1043  can be arranged next to or near photodiodes  1008 . One or more additional touch sensors  1043  can be arranged next to or in close proximity to NIR detectors  1011 . Groups of subpixels  1051  can include NIR emitters  1059 . The groups of subpixels  1051 , touch sensors  1043 , photodiodes  1008 , NIR detectors  1011 , and NIR emitters  1059  can optionally be included in cluster  1080 . Anode  1018  can be disposed in the pixel locations and can be coupled together so that proper biasing can be applied from the edge of the display or from one or more underlying metallization layers.  FIG. 10D  illustrates an exemplary arrangement of red subpixels (referred to as “R”), green subpixels (referred to as “G”), blue subpixels (referred to as “B”), NIR emitters (referred to as “I”), touch sensors (referred to as “T”), near-field imaging photodiodes (referred to as “P”), and near-IR detectors (referred to as “D”) in a pattern of RGBI-TP/RGBI-TD.  FIG. 10E  illustrates an exemplary pattern with a staggered placement of groups of subpixels  1051  to prevent the touch sensors  1043 , near-field imaging photodiodes  1008 , and NIR detectors  1011  from forming a visually noticeable pattern. 
     One advantage to OLED displays can be the ability to be fabricated into curved display screens. One way to achieve curved display screens can be to form the OLED stack on a flexible substrate, such as plastic, metal, or flexible glass. However, forming the OLED stack on a flexible substrate can result in low PPI and problems associated with overlaying a touch sensor panel on a display can arise. To achieve a curved display screen without compromising a high PPI, one or more exemplary devices described above can be combined with a fiber optic magnifier. 
       FIGS. 11A-11B  illustrate cross-sectional views of exemplary integrated Silicon-OLED display and touch sensor panels coupled to fiber optic magnifiers. A fiber optic magnifier such as fiber optic magnifier  1120  and fiber optic magnifier  1122  can be a magnifier formed by juxtaposing thousands of fiber optic cables, melting the cables together, and pulling the melted cables to form a taper. The fiber optic magnifier coupled to a display screen can display an enlargement of the image projected by the display. Referring to  FIG. 11A , OLED stack and touch sensors  1140  can display an image  1110 . A fiber optic magnifier  1120  can be coupled to OLED stack and touch sensors  1140  to project an enlarged image  1112 . 
     Different sizes and shapes of fiber optic magnifiers can be used. An exemplary integrated Silicon-OLED display and touch sensor panel coupled to a fiber optic magnifier is illustrated in  FIG. 11B . OLED stack and touch sensors  1142  can display an image  1150 . Fiber optic magnifier  1122  can be coupled to OLED stack and touch sensors  1142  to project an enlarged image  1152 . Fiber optic magnifier  1122  of  FIG. 11B  can be formed with a larger curvature than fiber optic magnifier  1120  of  FIG. 11A . Fiber optic magnifiers  1120  and  1122  can be used to form flat and curved displays. 
       FIG. 11C  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel with 180 degree display and touch capability. Electronic device  1100  can include a touch and display  1130  coupled with a cover glass  1134 . An ordinary image can be projected on the front face of the device  1160 . Device  1100  can include OLED stack and touch sensors  1140  located on the sides of the device. OLED stack and touch sensors  1140  can be coupled with fiber optic magnifier  1120  to form curved edges  1164 . OLED stack and touch sensors  1140  can project an enlarged version of the ordinary image on the edges  1164 . The combination of the touch and display  1130  coupled with cover glass  1134  and OLED stack and touch sensors  1140  coupled with fiber optic magnifiers  1120  can provide a device with curved surfaces and 180-degree display and touch capability. 
       FIG. 11D  illustrates an exemplary integrated Silicon-OLED display and touch sensor panel with 270-degree display and touch capability. Electronic device  1101  can include a touch and display  1130  coupled with a cover glass  1134 . An ordinary image can be projected on the front face  1160  of device  1101 . Device  1101  can include OLED stack and touch sensors  1142  located on the sides of the device. OLED stack and touch sensors  1142  can be coupled with fiber optic magnifier  1122  to form curved edges  1166 . OLED stack and touch sensors  1142  can project an enlarged version of the ordinary image on the sides of device  1101 . The combination of the touch and display  1130  coupled with cover glass  1134  and OLED stack and touch sensors  1142  coupled with fiber optic magnifier  1122  can provide a device with curved surfaces and 270-degree display and touch capability. 
     In some examples, touch and display  1130  can be integrated touch and display. In some examples, touch and display  1130  can be coupled with a fiber optic magnifier such as fiber optic magnifier  1120  and  1122 . In some examples, devices  1100  and  1101  can include any number of OLED stack and touch sensors  1140  and  1142  and fiber optic magnifiers  1120  or  1122 . The location of the components is not limited to one on each side of the devices  1100  and  1101 . In some examples, the taper of fiber optic magnifiers  1120  and  1122  can be varied to achieve any number of different degrees of display and touch capability. In some examples, devices  1100  and  1101  can include a display and cover glass or fiber optic magnifier on the back side (opposite side of front face  1160 ). 
     One further advantage to integrating the Silicon-OLED subpixels and touch sensors as described in the examples above is related to not only the thickness of the device stackup, but also the placement of components in the computing system and the total size of the device.  FIG. 12  illustrates an exemplary computing system  1200  that can utilize a conventional touch sensor panel. Touch controller  1206  can be a single application specific integrated (ASIC) that can include one or more processor subsystems such as processor subsystem  1202 . Processor subsystem  1202  can include, for example, one or more main processors, such as ARM968 processors or other processors with similar functionality and capabilities. However, in other examples, some of the processor functionality can be implemented instead by dedicated logic, such as a state machine. Processor subsystem  1202  can also include, for example, peripherals such as random access memory (RAM)  1212  or other types of memory or storage, watchdog timers (not shown), and the like. Touch controller  1206  can also include, for example, receive section  1207  for receiving signals, such as touch sense signals  1203 , from the sense lines of touch sensor panel  1224 , and other signals from other sensors such as sensor  1211 , etc. Touch controller  1206  can also include, for example, a demodulation section such as multistage vector demod engine  1209 , panel scan logic  1210 , and a drive system including, for example, transmit section  1214 . Panel scan logic  1210  can access RAM  1212 , autonomously read data from the sense channels, and provide control for the sense channels. In addition, panel scan logic  1210  can control transmit section  1214  to generate stimulation signals  1216  at various frequencies and phases that can be selectively applied to the drive lines of the touch sensor panel  1224 . 
     Charge pump  1215  can be used to generate the supply voltage for the transmit section. Stimulation signals  1216  (Vstim) can have amplitudes higher than the maximum voltage the ASIC process can tolerate by cascading transistors. Therefore, using charge pump  1215 , the stimulus voltage can be higher (e.g., 6V) than the voltage level a single transistor can handle (e.g., 3.6 V). Although  FIG. 12  shows charge pump  1215  separate from transmit section  1214 , the charge pump can be part of the transmit section. 
     Touch sensor panel  1224  can include a capacitive sensing medium having a plurality of drive lines and a plurality of sense lines. The drive and sense lines can be formed from a transparent conductive medium such as ITO or Antimony Tin Oxide (ATO), although other transparent and non-transparent materials such as copper can also be used. Drive and sense lines can be perpendicular to each other, although other non-Cartesian orientations are possible. For example, in a polar coordinate system, the sensing lines can be concentric circles and the driving lines can be radially extending lines (or vice versa). It should be understood, therefore, that the terms “drive lines” and “sense lines” as used herein are intended to encompass not only orthogonal grids, but the intersecting traces or other geometric configurations having first and second dimensions (e.g. the concentric and radial lines of a polar-coordinate arrangement). The drive and sense lines can be formed on, for example, a single side of a substantially transparent substrate. 
     At the “intersections” of the traces, where the drive and sense lines can pass adjacent to and above and below (cross) each other (but without making direct electrical contact with each other), the drive and sense lines can essentially form two electrodes (although more than two traces could intersect as well). Each intersection of drive and sense lines can represent a capacitive sensing node and can be viewed as pixel or node  1226 , which can be particularly useful when touch sensor panel  1224  can be viewed as capturing an “image” of touch. In other words, after touch controller  1206  has determined whether a touch event has been detected at each touch sensor in the touch sensor panel, 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 capacitance between drive and sense electrodes can appear as a stray capacitance when the given row is held at direct current (DC) voltage levels and as a mutual signal capacitance Csig when the given row is stimulated with an alternating current (AC) signal. The presence of a finger or other object near or on the touch sensor panel can be detected by measuring changes to a signal charge Qsig present at the pixels being touched, which can be a function of Csig. 
     Computing system  1200  can also include host processor  1228  for receiving outputs from processor subsystem  1202  and performing actions based on the outputs that can include, but are not limited to, moving an object 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, 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  1228  can perform additional functions that may not be related to panel processing, and can be coupled to program storage  1232  and display  1230 , such as an LCD display or OLED display on a glass or plastic substrate, for providing a user interface to a user for the device. In some examples, host processor  1228  can be a separate component for touch controller  1206 , as shown. In other examples, host processor  1228  can be included as part of touch controller  1206 . In other examples, the functions of host processor  1228  can be performed by processor subsystem  1202  and/or distributed among other components of touch controller  1206 . Display device  1230  together with touch sensor panel  1224 , when located partially or entirely under the touch sensor panel, can form touch screen  1218 . 
       FIG. 13  illustrates an exemplary computing system  1300  that can utilize the integrated Silicon-OLED display and touch sensor panel discussed above according to various examples of the disclosure. Computing system can be included in, for example, mobile telephone  136 , digital media player  140 , tablet computing device  148 , or any mobile or non-mobile computing device that includes touch and display screen  120 . Due to the high PPI achieved by forming the OLED subpixels on a Silicon substrate, touch sensors  1326  and OLED display subpixels  1328  can be integrated and formed side-by-side on the same substrate. Touch and display controller  1306  can also be formed on a Silicon substrate using processes similar to the above described processes, and can be integrated with the touch sensors  1326  and OLED display subpixels  1328 . 
     Computing system  1300  can include a touch and display controller  1306 . Touch and display controller  1306  can include one or more touch processors  1302 , one or more display processors  1303 , and peripherals  1304 . Peripherals  1304  can include, but are not limited to, RAM or other types of memory or non-transitory computer-readable storage media capable of storing program instructions executing by the touch processors  1302 , display processors  1303  watchdog timers, and the like. Touch and display controller  1306  can include, but is not limited to one or more sense channels  1308 , channel scan logic  1310  and driver logic  1314 . Channel scan logic  1310  can access RAM  1312 , autonomously read data from the sense channels and provide control for the sense channels. In addition, channel scan logic  1310  can control driver logic  1314  to generate stimulation signals  1316  at various frequencies and phases that can be selectively applied to drive regions or sensing electrodes of the touch sensing circuitry of integrated Silicon-OLED display and touch screen  1320 . In some examples, touch and display controller  1306 , touch processor  1302 , display processor  1303 , and peripherals  1304  can be integrated into a single application specific integrated circuit (ASIC). A processor, such as touch processor  1302 , executing instructions stored in non-transitory computer-readable storage media found in peripherals  1304  or RAM  1312 , can control touch sensing and processor, for example. 
     Touch and display controller  1306  can also include a host processor  1328  for receiving outputs from touch processor  1302  and display processor  1303  and performing actions based on the outputs. For example, host processor  1328  can be coupled to program storage  1332  and display processor  1303 . Host processor  1328  can use display processor  1303  to generate an image on the integrated Silicon-OLED display and touch screen  1320 , such as an image of a user interface (UI), by executing instructions stored in non-transitory computer-readable storage media found in program storage  1332 , for example, by applying the appropriate voltages to the cathode and anodes of the OLED stack. In some examples, touch processor  1302 , touch and display controller  1306 , display processor  1303 , and host processor  1308  can operate independently or cooperatively together. Host processor  1328  can use touch processor  1302  and display processor  1303  to detect and process a touch on or near the integrated Silicon-OLED display and touch sensor panel  1320 , such as a touch input to the displayed UI (displayed by display subpixels  1328 ). The touch input can be used by computer programs stored in program storage  1332  to perform actions. Host processor  1328  can perform additional functions that may or may not be related to touch and display processing. In some examples, host processor  1328  can be included as part of touch and display controller  1306 , as shown. In some examples, host processor  1328  can be a separate component for touch and display controller  1306 . In some examples, the functions of host processor  1328  can be performed by processor subsystem  1302  and/or distributed among other components of touch and display controller  1306 . 
     Similar to touch controller  1206  of exemplary computing system  1200 , touch and display controller  1306  can also include, for example, receive section  1307  for receiving signals, such as touch sense signals  1303  from touch sensors  1326 , and other signals from other sensors such as sensor  1311 , etc. Touch and display controller  1306  can also include, for example, a demodulation section such as demod engine  1309  and a drive system including, for example, transmit section  1318 . Channel scan logic  1310  can access RAM  1312 , autonomously read data from the sense channels  1308 , and provide control for the sense channels  1308 . In addition, channel scan logic  1310  can control transmit section  1318  to generate stimulation signals  1316  at various frequencies and phases that can be selectively applied to the drive lines or sensing electrodes of the integrated Silicon-OLED display and touch sensor panel  1320 . 
     The integrated Silicon-OLED display and touch sensor panel  1320  can be formed from the stackup configurations discussed above, and can include a capacitive sensing medium having a plurality of touch sensors such as touch plates, touch sensor layers, or touch electrodes. Some of the touch sensors can form drive regions, and some of the touch sensors can form sense regions. The touch sensors can be formed from a transparent conductive medium such as ITO or ATO, although other transparent and non-transparent materials such as copper can also be used. In some examples, the drive regions and sense regions can be drive and sense lines perpendicular to each other. Although in other examples, other non-Cartesian orientations are possible. For example, in a polar coordinate system, the sensing lines can be concentric circles and the driving lines can be radially extending lines (or vice versa). The touch sensors can be formed on, for example, a single side of a substrate, both sides of a substrate, or on different substrates. 
     Note that one or more of the functions described above can be performed, for example, by firmware stored in memory (e.g., one of the peripherals) and executed by processor subsystem, or stored in program storage  1332  and executed by host processor  1328 . The firmware can also be stored and/or transported within any non-transitory computer-readable storage medium (excluding signals) 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 instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this document, a “non-transitory computer-readable storage medium” can be any medium (excluding a signal) that can contain or store the program for use by or in connection with the instruction execution system, apparatus, or device. The non-transitory computer readable storage 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 disk such as 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 disclosure, 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. 
     In some examples, a touch sensor panel is disclosed. The touch sensor panel may comprise: one or more Silicon substrates; an OLED stack formed on at least one of the one or more Silicon substrates; and a plurality of touch sensors formed on at least one of the one or more Silicon substrates. Additionally or alternatively to one or more examples disclosed above, in other examples the OLED stack and plurality of touch sensors are disposed side by side. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of the plurality of touch sensors is located on a same layer as an anode of the OLED stack. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises one or more color filters, wherein at least one of the plurality of touch sensors are located on a same layer as at least one color filter. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises one or more transistors, wherein the one or more transistors form a transistor driver structure for the OLED stack. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises a transistor, wherein the transistor is coupled to at least one of the plurality of touch sensors. Additionally or alternatively to one or more examples disclosed above, in other examples the OLED stack is located in a pixel location and the plurality of touch sensors are located in a touch location, the pixel location distinct from the touch location. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises an electrostatic discharge device. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of the plurality of touch sensors includes a touch sensor layer, the touch sensor layer disposed on the OLED stack. Additionally or alternatively to one or more examples disclosed above, in other examples an area of the touch sensor layer is the same as an area of a display pixel of the OLED stack. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises a light shielding, wherein the light shielding is configured to sense a touch. Additionally or alternatively to one or more examples disclosed above, in other examples the light shielding is a multi-layer thin film stack. Additionally or alternatively to one or more examples disclosed above, in other examples one or more subpixels of the OLED stack and one or more touch sensors are included in one of a plurality of clusters. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises a switching matrix, wherein at least one of the plurality of clusters is coupled to a switch in the switching matrix. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of a display granularity and touch granularity is dynamically changed through the switching matrix. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises: one or more photodiodes. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of the one or more photodiodes is configured for near-field imaging. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of the one or more photodiodes is configured to detect a fingerprint. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel is configured to display an image on the OLED stack, sense a touch or hover on the touch sensors, and capture an image from the one or more photodiodes at a same time. Additionally or alternatively to one or more examples disclosed above, in other examples at least one of the one or more photodiodes is a near-infrared detector. Additionally or alternatively to one or more examples disclosed above, in other examples the near-infrared detector is coupled to a near-infrared emitter. Additionally or alternatively to one or more examples disclosed above, in other examples the touch sensor panel further comprises a near-infrared color filter, wherein the near-infrared emitter is included in the OLED stack. 
     In some examples, a method of forming a touch sensor panel is disclosed. The method may comprise: forming an OLED stack on at least one of one or more Silicon substrates; and forming a plurality of touch sensors on at least one of the one or more Silicon substrates. Additionally or alternatively to one or more examples disclosed above, in other examples the method further comprises: forming an electrostatic discharge device. Additionally or alternatively to one or more examples disclosed above, in other examples the method further comprises: forming one or more photodiodes. 
     Although the disclosed examples 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 the disclosed examples as defined by the appended claims.

Metadata:
Filing Date: 20140516
Publication Date: 20171205
Grant Date: 20171205
Priority Date: 20140516
Inventors: NHO HYUNWOO HENRY
BAE HOPIL
YAO WEIJUN
LI YINGXUAN
AL-DAHLE AHMAD
Assignee: APPLE INC
CPC Classifications: [{"code": "G06K9/0002", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04106", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04103", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/042", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/044", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0421", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L27/323", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1306", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1306", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0443", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04164", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0446", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0445", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/04164", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0446", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K59/40", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K59/38", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10K59/121", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K59/38", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10K59/40", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K59/65", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K50/86", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10K59/131", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10K59/131", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10K59/121", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04106", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0421", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04103", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/042", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04106", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/042", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0412", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/04103", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0421", "inventive": true, "first": true, "tree": "[]"}, {"code": "H10K59/65", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10K59/8791", "inventive": false, "first": false, "tree": "[]"}]
Family ID: 54538479