Patent Application
20080297487
This relates generally to proximity sensing displays, and more particularly, to proximity sensing displays using infrared or other radiation for sensing proximity events.
Many types of input devices are presently available for performing operations in a computing system, such as buttons or keys, mice, trackballs, touch panels, joysticks, 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 panel, which can be a clear panel with a touch-sensitive surface. The touch panel can be positioned in front of a display screen so that the touch-sensitive surface covers the viewable area of the display screen. Touch screens can allow a user to make selections and move a cursor by simply touching the display screen via a finger or stylus. In general, the touch screen can recognize the touch and position of the touch on the display screen, and the computing system can interpret the touch and thereafter perform an action based on the touch event.
State-of-the-art touch panels can detect multiple touches and near touches (within the near-field detection capabilities of their touch sensors) occurring at about the same time, and identify and track their locations. Examples of multi-touch panels are described in Applicant's co-pending U.S. application Ser. No. 10/842,862 entitled “Multipoint Touchscreen,” filed on May 6, 2004 and published as U.S. Published Application No. 2006/0097991 on May 11, 2006, the contents of which are incorporated by reference herein.
In addition to detection of touching events, the detection of fingers, palms or other objects hovering near the touch panel is desirable because it can enable the computing system to perform certain functions without necessitating actual contact with the touch panel, such as turning the entire touch panel or portions of the touch panel on or off, turning the entire display screen or portions of the display screen on or off, powering down one or more subsystems in the computing system, enabling only certain features, dimming or brightening the display screen, etc. Additionally, merely by placing a finger, hand or other object near a touch panel, virtual buttons on the display screen can be highlighted without actually triggering the “pushing” of those buttons to alert the user that a virtual button is about to be pushed should the user actually make contact with the touch panel. Furthermore, the combination of touch panel and proximity (hovering) sensor input devices can enable the computing system to perform additional functions not previously available with only a touch panel.
This relates to the use of one or more proximity sensors in combination with one or more touch sensors in a multi-touch panel. The combination of these two different types of sensors can be used to detect the presence of one or more fingers, body parts or other objects hovering above a touch-sensitive surface or touching the touch-sensitive surface. A computing system can control or trigger one or more functions in accordance with an “image” of touch or hover provided by the sensor outputs.
Proximity sensors can, in some embodiments, include IR transmitters for transmitting IR radiation, and IR receivers for receiving IR radiation reflected by a finger or another object in proximity to the panel. To detect the location of touch events at different positions relative to the panel, multiple IR receivers can be placed on the panel. For example, a grid of IR receivers can be placed on the panel, allowing each IR receiver to serve as a “proximity pixel” indicating the presence or absence of an object in its vicinity (e.g., above it) and, in some cases, the distance between the receiver and the object. Data received from multiple receivers in of a panel can be processed to determine the positioning of one or more objects above the panel. In some embodiments, one or more infrared (IR) proximity sensors can be driven with a specific stimulation frequency and emit IR light from one or more areas, which can in some embodiments correspond to one or more touch sensor “pixel” locations. The reflected IR signal, if any, resulting from a hovering or touching object, can be demodulated using synchronous demodulation. In some embodiments, both physical interfaces (the touch and proximity sensors) can be connected to analog channels in the same electrical core to generate a value corresponding to the amount of touch or hover.
The concurrent use of a multi-touch panel along with one or more proximity sensors can provide additional detection and operational capabilities not available with a multi-touch panel by itself. For example, although only the actual touching of a finger, palm or other object upon a touch-sensitive surface or an object hovering in the near-field can generally be detected by a capacitive touch sensor, the hovering of a finger, palm or other object above a surface in the far field can be detected due to a change in the output of a photodiode amplifier in the proximity sensor. The detection of a hovering object can enable a computing system to perform certain functions that are preferentially triggered by hovering as opposed to touch. Furthermore, the use of the same analog channel design to receive both the touch sensor outputs in the multi-touch panel and the proximity sensor outputs and generate a value representative of the amount of touch or proximity of an object can enable both touch and proximity sensors to be connected to a single multi-touch subsystem for processing, eliminating the need for separate processing circuitry and reducing overall system costs.
One or more proximity sensors can be used in conjunction with a multi-touch panel. In some embodiments, an exemplary multi-touch panel can include a proximity sensor located at every touch sensor or pixel. In other embodiments, a proximity sensor can be selectively deployed at certain pixels where the detection of touch or hover may be more critical, or in a spread pattern in broad hover-sensitive areas. In still other embodiments, some rows in the multi-touch panel could be proximity sensor rows, with others being touch sensor rows.
The one or more proximity sensors can be used to implement the function of “pushing” virtual buttons appearing on the touch panel (in some embodiments with an audible confirmation) and trigger functions without actually requiring contact with the touch panel. For example, merely by hovering one's finger over a proximity sensor, a user can turn the entire touch panel on or off, turn portions of the touch panel on or off, power down a particular subsystem such as a touch subsystem, enable only certain features, dim or brighten the display, etc. In one specific example, if a user's cheek is detected near the touch panel by one or more proximity sensors, the touch panel can be powered down, and the display device can be dimmed or powered down so there is no reflection off the user's face. It can also provide the aesthetic function of dimming down the display device when brought close to the user's face, and brightening the display when moved away from the face. One or more proximity sensors can also detect that the device is inside a pocket, with similar results.
Further embodiments of the invention relate to a proximity panel that may or may not be combined with a multi-touch panel. The proximity panel can include a grid of multiple IR transmitters and a grid of multiple IR receivers. Various groups of one or more transmitters from the multiple IR transmitters can be selectively shut down while other transmitters continue operation.
The transmitters and receivers can be positioned in a single layer, or on different layers. In some embodiments, the proximity panel is provided in combination with a display. The display can be, for example, a liquid crystal display (LCD) or an organic light emitting diode display (OLED display). Other types of displays can also be used. The IR transmitters and receivers can be positioned at the same layer as the electronic elements of the display (e.g., the LEDs of an OLED display or the pixel cells of an LCD display). Alternatively, the IR transmitters and receivers can be placed at different layers.
In addition to infrared, other types of radiation can be used for proximity sensing. Existing emitters and detectors for these types of radiation can be used instead of the IR transmitters and receivers.
a illustrates an exemplary capacitive multi-touch panel according to one embodiment of this invention.
b is a side view of an exemplary capacitive touch sensor or pixel in a steady-state (no-touch) condition according to one embodiment of this invention.
c is a side view of the exemplary capacitive touch sensor or pixel in a dynamic (touch) condition according to one embodiment of this invention.
a illustrates an exemplary analog channel (also known as an event detection and demodulation circuit) according to one embodiment of this invention.
b is a more detailed illustration of a virtual ground charge amplifier at the input of an analog channel, and the capacitance contributed by a capacitive touch sensor and seen by the charge amplifier according to one embodiment of this invention.
c illustrates an exemplary Vstim signal with multiple pulse trains each having a fixed number of pulses, each pulse train having a different frequency Fstim according to one embodiment of this invention.
a is an illustration of an exemplary proximity sensor according to one embodiment of this invention.
b illustrates an exemplary multi-touch panel with a proximity sensor located at every touch sensor or pixel according to one embodiment of this invention.
c illustrates an exemplary multi-touch panel with a proximity sensor selectively deployed at certain pixels where the detection of touch or hover is more critical, and in a spread pattern in other areas of the panel according to one embodiment of this invention.
d illustrates and exemplary multi-touch panel with some rows being proximity sensor rows and others being touch sensor rows according to one embodiment of this invention.
e illustrates an exemplary concurrent use of proximity sensors and a multi-touch panel according to one embodiment of this invention.
a illustrates an exemplary array of light emitting diode (LED)/photodiode pairs, each pair representing a portion of a proximity sensor, according to one embodiment of this invention.
b illustrates an exemplary array of LED/photodiode pairs, each pair representing a portion of a proximity sensor, according to one embodiment of this invention.
a illustrates an exemplary computing system using both a multi-touch panel and proximity sensors according to one embodiment of this invention.
b illustrates an exemplary mobile telephone that can include multi-touch panel, proximity sensors, display device, and other computing system blocks according to one embodiment of this invention.
c illustrates an exemplary digital audio/video player that can include multi-touch panel, proximity sensors, display device, and other computing system blocks according to one embodiment of this invention.
In the following description of preferred embodiments, reference is made to the accompanying drawings, in which it is shown by way of illustration specific embodiments in which the invention can be practiced. It is to be understood that other embodiments can be used and structural changes can be made without departing from the scope of the embodiments of this invention.
One or more proximity sensors together with a plurality of touch sensors in a multi-touch panel can enable a computing system to sense both multi-touch events (the touching of fingers or other objects upon a touch-sensitive surface at distinct locations at about the same time) and hover events (the no-touch, close proximity hovering of fingers or other objects above a touch-sensitive surface but outside the near-field detection capabilities of touch sensors), as well as perform additional functions not previously available with touch sensors alone.
Although some embodiments of this invention may be described herein in terms of proximity sensors in combination with capacitive touch sensors in a multi-touch panel, it should be understood that embodiments of this invention are not so limited, but are generally applicable to the use of proximity sensors with any type of multi-touch sensor technology that can include resistive touch sensors, surface acoustic wave touch sensors, electromagnetic touch sensors, near field imaging touch sensors, and the like. Furthermore, although the touch sensors in the multi-touch panel may be described herein in terms of an orthogonal array of touch sensors having rows and columns, it should be understood that embodiments of this invention are not limited to orthogonal arrays, but can be generally applicable to touch sensors arranged in any number of dimensions and orientations, including diagonal, concentric circle, and three-dimensional and random orientations. In addition, it is noted that some touch sensors, particularly capacitive sensors, can detect some hovering or proximity in the near field. Thus, the term “proximity sensor,” as used herein, should be understood to be a proximity sensor that is able to detect hovering objects outside the near-field detection capabilities of touch sensors.
Multi-touch touch-sensitive panels according to one embodiment of this invention can detect multiple touches (touch events or contact points) that occur at about the same time (and at different times), and identify and track their locations.
Driver logic 114 can provide multiple multi-touch subsystem outputs 116 and can present a proprietary interface that drives high voltage driver, which is comprised of decoder 120 and subsequent level shifter and driver stage 118, although level-shifting functions could be performed before decoder functions. Level shifter and driver 118 can provide level shifting from a low voltage level (e.g. CMOS levels) to a higher voltage level, providing a better signal-to-noise (S/N) ratio for noise reduction purposes. Decoder 120 can decode the drive interface signals to one out of N outputs, whereas N is the maximum number of rows in the panel. Decoder 120 can be used to reduce the number of drive lines needed between the high voltage driver and multi-touch panel 124. Each multi-touch panel row input 122 can drive one or more rows in multi-touch panel 124. In some embodiments, driver 118 and decoder 120 can be integrated into a single ASIC. However, in other embodiments driver 118 and decoder 120 can be integrated into driver logic 114, and in still other embodiments driver 118 and decoder 120 can be eliminated entirely.
Multi-touch panel 124 can in some embodiments include a capacitive sensing medium having a plurality of row traces or driving lines and a plurality of column traces or sensing lines, although other sensing media may also be used. The row and column traces may be formed from a transparent conductive medium, such as Indium Tin Oxide (ITO) or Antimony Tin Oxide (ATO), although other transparent and non-transparent materials, such as copper, can also be used. In some embodiments, the row and column traces can be formed on opposite sides of a dielectric material, and can be perpendicular to each other, although in other embodiments other non-orthogonal 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 “row” and “column,” “first dimension” and “second dimension,” or “first axis” and “second axis” as used herein are intended to encompass not only orthogonal grids, but the intersecting traces of other geometric configurations having first and second dimensions (e.g. the concentric and radial lines of a polar-coordinate arrangement). It should also be noted that in other embodiments, the rows and columns can be formed on a single side of a substrate, or can be formed on two separate substrates separated by a dielectric material. In some embodiments, the dielectric material can be transparent, such as glass, or can be formed from other materials, such as mylar. An additional dielectric cover layer may be placed over the row or column traces to strengthen the structure and protect the entire assembly from damage.
At the “intersections” of the traces, where the traces pass above and below (cross) each other (but do not make direct electrical contact with each other), the traces essentially form two electrodes (although more than two traces could intersect as well). Each intersection of row and column traces can represent a capacitive sensing node and can be viewed as picture element (pixel) 126, which can be particularly useful when multi-touch panel 124 is viewed as capturing an “image” of touch. (In other words, after multi-touch subsystem 106 has determined whether a touch event has been detected at each touch sensor in the multi-touch 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 row and column electrodes appears as a stray capacitance on all columns when the given row is held at DC and as a mutual capacitance Csig when the given row is stimulated with an AC signal. The presence of a finger or other object near or on the multi-touch panel can be detected by measuring changes to Csig. The columns of multi-touch panel 124 can drive one or more analog channels 108 (also referred to herein as event detection and demodulation circuits) in multi-touch subsystem 106. In some embodiments, each column is coupled to one dedicated analog channel 108. However, in other embodiments, the columns may be couplable via an analog switch to a fewer number of analog channels 108.
Computing system 100 can also include host processor 128 for receiving outputs from multi-touch panel processor 102 and performing actions based on the outputs that may 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 connected to the host device, answering a telephone call, placing a telephone call, terminating a telephone call, changing the volume or audio settings, storing information related to telephone communications such as addresses, frequently dialed numbers, received calls, missed calls, logging onto a computer or a computer network, permitting authorized individuals access to restricted areas of the computer or computer network, loading a user profile associated with a user's preferred arrangement of the computer desktop, permitting access to web content, launching a particular program, encrypting or decoding a message, and/or the like. Host processor 128 may also perform additional functions that may not be related to multi-touch panel processing, and can be coupled to program storage 132 and display device 130 such as an LCD display for providing a user interface (UI) to a user of the device.
a illustrates exemplary capacitive multi-touch panel 200.
b is a side view of exemplary pixel 202 in a steady-state (no-touch) condition. In
c is a side view of exemplary pixel 202 in a dynamic (touch) condition. In
Referring again to
Each analog channel coupled to a column measures the mutual capacitance formed between that column and the row. This mutual capacitance is comprised of the signal capacitance Csig and any change Csig_sense in that signal capacitance due to the presence of a finger, palm or other body part or object. These column values provided by the analog channels may be provided in parallel while a single row is being stimulated, or may be provided in series. If all of the values representing the signal capacitances for the columns have been obtained, another row in multi-touch panel 200 can be stimulated with all others held at a DC voltage, and the column signal capacitance measurements can be repeated. Eventually, if Vstim has been applied to all rows, and the signal capacitance values for all columns in all rows have been captured (i.e. the entire multi-touch panel 200 has been “scanned”), a “snapshot” of all pixel values can be obtained for the entire multi-touch panel 200. This snapshot data can be initially saved in the multi-touch subsystem, and later transferred out for interpretation by other devices in the computing system such as the host processor. As multiple snapshots are obtained, saved and interpreted by the computing system, it is possible for multiple touches to be detected, tracked, and used to perform other functions.
a illustrates exemplary analog channel or event detection and demodulation circuit 300. One or more analog channels 300 can be present in the multi-touch subsystem. One or more columns from a multi-touch panel can be connectable to each analog channel 300. Each analog channel 300 can include virtual-ground charge amplifier 302, signal mixer 304, offset compensation 306, rectifier 332, subtractor 334, and analog-to-digital converter (ADC) 308.
Vstim, as applied to a row in the multi-touch panel, can be generated as a burst of square waves or other non-DC signaling in an otherwise DC signal, although in some embodiments the square waves representing Vstim can be preceded and followed by other non-DC signaling. If Vstim is applied to a row and a signal capacitance is present at a column connected to analog channel 300, the output of charge amplifier 302 can be pulse train 310 centered at Vref with a peak-to-peak (p-p) amplitude in the steady-state condition that is a fraction of the p-p amplitude of Vstim, the fraction corresponding to the gain of charge amplifier 302. For example, if Vstim includes 18V p-p pulses and the gain of the charge amplifier is 0.1, then the output of the charge amplifier can be 1.8V p-p pulses. This output can be mixed in signal mixer 304 with demodulation waveform Fstim 316.
Because Vstim can create undesirable harmonics, especially if formed from square waves, demodulation waveform Fstim 316 can be a Gaussian sine wave in an otherwise DC signal that is digitally generated from look-up table (LUT) 312 or other digital logic and synchronized to Vstim. In some embodiments, Fstim 316 can be tunable in frequency and amplitude by selecting different digital waveforms in LUT 312 or generating the waveforms differently using other digital logic. Signal mixer 304 can demodulate the output of charge amplifier 310 by subtracting Fstim 316 from the output to provide better noise rejection. Signal mixer 304 can reject all frequencies outside the passband, which can in one example be about +/−30 kHz around Fstim. This noise rejection can be beneficial in noisy environment with many sources of noise, such as 802.11, Bluetooth and the like, all having some characteristic frequency that can interfere with the sensitive (femtofarad level) analog channel 300. Signal mixer 304 is essentially a synchronous rectifier as the frequency of the signal at its inputs is the same, and as a result, signal mixer output 314 is essentially a rectified Gaussian sine wave.
Offset compensation 306 can then be applied to signal mixer output 314, which can remove the effect of the static Csig, leaving only the effect of ΔCsig appearing as result 324. Offset compensation 306 can be implemented using offset mixer 330. Offset compensation output 322 can be generated by rectifying Fstim 316 using rectifier 332, and mixing rectifier output 336 with analog voltage from a digital-to-analog converter (DAC) 320 in offset mixer 330. DAC 320 can generate the analog voltage based on a digital value selected to increase the dynamic range of analog channel 300. Offset compensation output 322, which can be proportional to the analog voltage from DAC 320, can then be subtracted from signal mixer output 314 using subtractor 334, producing subtractor output 338 which can be representative of the change in the AC capacitance ΔCsig that occurs when a capacitive sensor on the row being stimulated has been touched. Subtractor output 338 is then integrated and can then be converted to a digital value by ADC 308. In some embodiments, integrator and ADC functions are combined and ADC 308 may be an integrating ADC, such as a sigma-delta ADC, which can sum a number of consecutive digital values and average them to generate result 324.
b is a more detailed view of charge amplifier (a virtual ground amplifier) 302 at the input of an analog channel, and the capacitance that can be contributed by the multi-touch panel (see dashed lines) and seen by the charge amplifier. As mentioned above, there can be an inherent stray capacitance Cstray at each pixel on the multi-touch panel. In virtual ground amplifier 302, with the + (noninverting) input tied to Vref, the − (inverting) input is also driven to Vref, and a DC operating point is established. Therefore, regardless of how much Csig is present, the − input is always driven to Vref. Because of the characteristics of virtual ground amplifier 302, any charge Qstray that is stored in Cstray is constant, because the voltage across Cstray is kept constant by the charge amplifier. Therefore, no matter how much stray capacitance Cstray is added to the − input, the net charge into Cstray will always be zero. Therefore the input charge Qsig_sense=(Csig−ΔCsig_sense)Vstim is zero when the corresponding row is kept at DC and is purely a function of Csig and Vstim when the corresponding row is stimulated. In either case, because there is no charge across Csig, the stray capacitance is rejected, and it essentially drops out of any equations. Thus, even with a hand over the multi-touch panel, although Cstray can increase, the output will be unaffected by the change in Cstray.
The gain of virtual ground amplifier 302 is usually small (e.g. 0.1) and is equivalent to the ratio of Csig (e.g. 2 pF) and feedback capacitor Cfb (e.g. 20 pF). The adjustable feedback capacitor Cfb converts the charge Qsig to the voltage Vout. Therefore, the output Vout of virtual ground amplifier 302 is a voltage that is equivalent to the ratio of −Csig/Cfb multiplied by Vstim referenced to Vref. The high voltage Vstim pulses can therefore appear at the output of virtual ground amplifier 302 as much smaller pulses having an amplitude identified by reference character 326. However, when a finger is present, the amplitude of the output can be reduced as identified by reference character 328, because the signal capacitance is reduced by ΔCsig.
c illustrates an exemplary Vstim signal with multiple pulse trains each having a fixed number of pulses, each pulse train having a different frequency Fstim (e.g. 140 kHz, 200 kHz, and 260 kHz). With multiple pulse trains at different frequencies, one or more results can be obtained at each frequency. If a static interferer is present at a particular frequency, the results at that frequency can be corrupted as compared to the results obtained at the other two frequencies, and those results can be eliminated. The results at the remaining two frequencies can be averaged to compute the result.
The multiple Fstims may be applied in different ways to the multi-touch panel. In some embodiments, N columns can be connected to one analog channel via N:1 demultiplexer. A given row would then have to be stimulated N times to acquire Csig for all columns and then repeated for the other two frequencies. In this embodiment, fewer channels are needed but it takes longer to process an image. In other embodiments, one channel can be allotted for each column. A given row only has to be stimulated once to acquire Csig for all columns and then repeated for the other two frequencies. This arrangement can be faster then the previous arrangement; however, it takes more dedicated channels, which may be necessary for large multi-touch panels and when communications are USB, which could drop packets if too slow. After an entire “image” is captured, it can be processed. In further embodiments, multiple stimuli (scan circuits) can be applied to different rows at the same time to speed up the process. Fstim can be programmable. In some embodiments, a lookup table can be used to synthesize a demodulation waveform. The feedback capacitance Cfb and offset can also be programmable.
Embodiments of this invention relate to the use of one or more proximity sensors in combination with one or more touch sensors in a multi-touch panel to detect the presence of a finger, body part or other object and control or trigger one or more functions in accordance with an “image” of touch provided by the sensor outputs. In some embodiments, one or more infrared (IR) proximity sensors or other types of proximity sensors can be driven with a specific stimulation frequency and emit IR light from one or more areas, which can in some embodiments correspond to one or more touch sensor “pixel” locations. The reflected IR signal, if any, can be demodulated using synchronous demodulation. In some embodiments, both physical interfaces (the touch and proximity sensors) can be connected to analog channels in the same electrical core.
The concurrent use of a multi-touch panel along with one or more proximity sensors can provide additional detection and operational capabilities not available with a multi-touch panel by itself. For example, although only the actual touching of a finger, palm or other object upon a touch-sensitive surface can be detected by a touch sensor, the mere hovering of a finger, palm or other object above a surface can be detected due to a change in the output of a photodiode amplifier in the proximity sensor. The detection of a hovering object can enable a computing system to perform certain functions that are preferentially triggered by hovering as opposed to touch. Furthermore, the use of the same analog channel design to receive both the touch sensor outputs in the multi-touch panel and the proximity sensor outputs and generate a value representative of the amount of touch or proximity of an object can enable both touch and proximity sensors to be connected to a single multi-touch subsystem for processing, eliminating the need for separate processing circuitry and reducing overall system costs.
a is an illustration of exemplary proximity sensor 400 according to some embodiments of this invention. Proximity sensors 400 can detect one or more fingers, a palm or other object touching the multi-touch panel or hovering over the multi-touch panel in the far field without touching it. Proximity sensor 400 can include source Vstim 402 that drives IR light emitting diode (LED) 404, which emits transmitted IR 406. Vstim 402 can include a burst of square waves in an otherwise DC signal, in a manner similar to the Vstim applied to the rows on the capacitive multi-touch panel as described above, although in some embodiments the square waves representing Vstim can be preceded and followed by other non-DC signaling. Reflected IR 408, which may have reflected off of a finger, palm or other object 410, can be detected by photodiode (e.g. a fast pin diode) 412 or any other device (e.g. a phototransistor or other sensing device) whose current changes as a function of received IR light. Photodiode 412 can be reversed biased to a reference voltage Vref, which can be maintained at the − input (inverting input) of photodiode amplifier 414 whose + input (non-inverting input) is tied to Vref. The photocurrent produced through the photodiode, Iphoto, also primarily passes through the parallel combination of feedback resistor Rfb and capacitor Cfb, and the output of the photodiode amplifier is Vref−(Zcfb×Rfb)×(Iphoto+Iin)/(Zcfb+Rfb), the latter term (Zcfb×Rfb)×(Iphoto+Iin)/(Zcfb+Rfb), representing the voltage drop across Rfb and Cfb where Iin is the input current to the inverting input of photodiode amplifier 414 and is usually negligible. The impedance Zcfb is frequency dependent and can be adjusted to optimize the gain of the photo amplifier for a given modulation frequency of the signal Iphoto, whereas Iphoto(t)=Ip×sin(wt) with wt=2×PI×fmod and fmod is the modulation signal, Ip is the amplitude of the modulation signal and Zcfb=−1/(jwt). The modulation frequency fmod is equivalent to the modulation frequency fstm of Vstm. The output of photodiode amplifier 414 can be AC coupled using AC coupling capacitor 416.
Note that if photodetector 412 and LED 404 are close enough to the analog channels, a separate photodiode amplifier 414 may not be required and photodiode 412 can potentially directly connected to an analog channel. A separate photodiode amplifier 414 is usually needed to prevent noise pickup when photodiode 412 is located far away from the analog channels. Because photodiode amplifier 414 provides a low impedance output, noise injection is reduced.
One or more proximity sensors can be used in conjunction with a multi-touch panel according to some embodiments of this invention.
One or more proximity sensors 400 can be used to implement the function of “pushing” virtual buttons appearing on the touch panel (in some embodiments with an audible confirmation) and trigger functions without actually making contact with the touch panel. For example, merely by hovering one's finger over a proximity sensor, a user can turn the entire touch panel on or off, turn portions of the touch panel on or off, power down a particular subsystem such as a touch subsystem, enable only certain features, dim or brighten the display, etc. In one specific example, if a cheek is detected near the touch panel by one or more proximity sensors, the touch panel can be powered down, and the display device can be dimmed or powered down so there is no reflection off the user's face. It can also provide the aesthetic function of dimming down the display device when brought close to the user's face, and brightening the display when brought away from the face. One or more proximity sensors can also detect that the device is inside a pocket, with the same result.
e illustrates an exemplary concurrent use of proximity sensors 422 and 424 and multi-touch panel 426 according to some embodiments of this invention. In the example of
Referring again to exemplary proximity sensor 400 of
a illustrates an exemplary proximity sensor panel 506 that can include an array of LED/photodiode pairs 500, each pair representing a portion of a proximity sensor, according to some embodiments of this invention. In
In the last two columns of
b illustrates an exemplary proximity sensor panel 506 that can include an array of LED/photodiode pairs 500, each pair representing a portion of a proximity sensor, according to some embodiments of this invention. The configuration of
a illustrates an exemplary computing system 600 using both touch sensors and proximity sensors according to some embodiments of this invention. Computing system 600 may correspond to computing devices such as desktops, laptops, tablets or handhelds, including personal digital assistants (PDAs), digital music and/or video players and mobile telephones. Computing system 600 may also correspond to public computer systems such as information kiosks, automated teller machines (ATM), point of sale machines (POS), industrial machines, gaming machines, arcade machines, vending machines, airline e-ticket terminals, restaurant reservation terminals, customer service stations, library terminals, learning devices, and the like.
Computing system 600 can include one or more multi-touch panel processors 602 and peripherals 604, and multi-touch subsystem 606. Multi-touch subsystem 606 can include, but is not limited to, analog channels 608, channel scan logic 610 and driver logic 614. Channel scan logic 610 can access RAM 612, autonomously read data from the analog channels and provide control for the analog channels. This control can include multiplexing columns of multi-touch panel 624 or outputs of proximity sensors 634 to analog channels 608. In addition, channel scan logic 610 can control the driver logic and the scanning of multi-touch panel 634 and proximity sensors 634 (i.e. controlling the application of stimulation signals to individuals rows of multi-touch panel 624 and proximity sensors 634).
Driver logic 614 can provide multiple multi-touch subsystem outputs 616 and can present a proprietary interface that drives a high voltage driver, which is comprised of decoder 620 and subsequent level shifter and driver stage 618, although level-shifting functions could be performed before decoder functions. Level shifter and driver 618 can provide level shifting from a low voltage level (e.g. CMOS levels) to a higher voltage level, providing a better signal-to-noise (S/N) ratio for noise reduction purposes. Decoder 620 can decode the drive interface signals to one out of N outputs, whereas N is the maximum number of rows in the panel. Decoder 620 can be used to reduce the number of drive lines needed between the high voltage driver and multi-touch panel 624. Each multi-touch panel row input 622 can drive one or more rows in multi-touch panel 624. In some embodiments, driver 618 and decoder 620 can be integrated into a single ASIC. However, in other embodiments driver 618 and decoder 620 can be integrated into driver logic 614, and in still other embodiments driver 618 and decoder 620 can be eliminated entirely. Proximity sensors 634, although illustrated as a proximity sensor panel having evenly spaced proximity sensors for purposes of illustration only, can also be a proximity sensor panel with unevenly spaced or clustered proximity sensors, one or more rows of proximity sensors, or even a single proximity sensor. Furthermore, although
The array of touch-sensitive pixels 626 in multi-touch panel 624 can capture an “image” of touch. Additionally, one or more proximity sensors 634, which can be located within multi-touch panel 624 or separate from the panel, can also capture an “image” of touch or hover. In other words, after multi-touch subsystem 106 has determined whether a hover event has been detected at each proximity sensor, the pattern of proximity sensors at which a hover event occurred can be viewed as an “image” of hover (e.g. a finger-shaped pattern)). The columns of multi-touch panel 624 and one or more proximity sensors 634 can drive analog channels 608 in multi-touch subsystem 606.
Computing system 600 can also include host processor 628 for performing additional functions that may not be related to multi-touch panel processing, and can be coupled to program storage 632 which may include, but is not limited to, Read-Only Memory (ROM), Random-Access Memory (RAM), a hard disk drive, removable storage media that can include, for example, CD-ROM, DVD, PC-CARD, flash, floppy disk, magnetic tape, and a network component. Host processor 628 can also be coupled to display device 630 for providing a user interface (UI) to a user of the device. Display device 630 can be configured to display a graphical user interface (GUI) that can include a pointer or cursor as well as other information to the user. By way of example, display device 630 can be a monochrome display, color graphics adapter (CGA) display, enhanced graphics adapter (EGA) display, variable-graphics-array (VGA) display, super VGA display, liquid crystal display (e.g., active matrix, passive matrix and the like), cathode ray tube (CRT), plasma display and the like.
Computing system 600 in the example of
b illustrates an exemplary mobile telephone 636 that can include multi-touch panel 624, proximity sensors 634, display device 630, and other computing system blocks in computing system 600 of
c illustrates an exemplary digital audio/video player that can include multi-touch panel 624, proximity sensors 634, display device 630, and other computing system blocks in computing system 600 of
While the combination of a proximity sensing panel with a multi-touch panel is discussed above, embodiments of the invention also include using an improved proximity sensing panel without a multi-touch panel. For example, a proximity sensing panel, such as the one shown in
Various rays from radiation 702 can be reflected by an object in proximity to the panel, and their reflections detected by IR detectors 703. Signals produced by IR detectors 703 can then be processed to detect proximity events.
However, the conventional system of
The practice of radiating the entire panel with IR radiation may result in relatively high power requirements. Furthermore, it may result in the inability to accurately detect detailed proximity events. This latter issue is shown in more detail in
However, this can be addressed by the proximity panels of embodiments of the present invention, such as the panels of
Referring back to
Furthermore, the ability to selectively turn various transmitters on and off can significantly reduce the power requirements of the panel. This can allow the panel to operate in such a manner that at any time, only a small portion of the panel's many transmitters are active. For example, the panel can “scroll” by sequentially activating a row of transmitters and keeping all others off (as discussed above). The panel can also selectively deactivate all transmitters in entire areas of the panel for a longer time if the situation does not call for these areas to perform any proximity sensing. Thus, if software running at a device including the panel 800 only requires proximity sensing above a certain portion of the panel, the panel can turn off all transmitters except for those located at that specific part of the panel to save power. Additionally the panel can selectively turn off some transmitters or groups of transmitters in order to achieve lower power at the cost of reduced accuracy.
While
As described above, the proximity sensor panel of
While
The IRPDs can be IR diodes used to transmit and receive IR radiation for proximity sensing. Each IRPD can include a transmitting diode (e.g. an LED) or a receiving diode (e.g. a photodiode). Alternative IRPDs can include different types of diodes (thus, for example, IRPD 902 can include a transmitting diode, while IRPD 903 can include a receiving one).
Alternatively, each IRPD can include a diode that can perform both the transmission and receiving functions. Thus, each IRPD can either transmit IR or detect IR depending on various signals received from a controller of the panel. In yet another alternative, each IRPD can include two diodes—one transmitting and one receiving.
The IRPDs can be connected through one or more transmission lines to a controller of the panel. The controller can send signals to cause the transmitting diodes to transmit IR radiation and receive signals from the receiving IR diodes. In some embodiments, the connection can be such that each diode can be individually controlled. As mentioned above, this can be achieved, for example, using the same technique utilized for connecting the pixels of an ordinary LCD display (i.e., by using column and row transmission lines and connecting the column and row transmission lines to a transistor at each IRPD).
In some embodiments, the IRPDs can use their own dedicated transmission lines. In other embodiments, the IRPDs can share the transmission lines of neighboring VPs. In these embodiments, the display and proximity sensing functions can be time multiplexed. In other words, the transmission lines can be used to control/energize the VPs for a first time period, and then the transmission lines can be switched for controlling/energizing the IR transmitters and receiving signals from the IR receivers during a second time period. Thus, use for the display and proximity sensing functions can alternate. This multiplexing can be performed at a sufficiently high frequency to prevent any noticeable flicker.
In some OLED display embodiments, all IRPDs can be transmitting diodes. Receiving of reflected IR radiation may be performed by diodes within the VPs. Because the R, G, B cells within the various VPs in OLED displays include LEDs, these LEDs can be used to receive IR radiation and send it to a controller. In these embodiments, the display and proximity sensing functions can again be time multiplexed to allow the diodes within the VPs to perform IR sensing when they are not emitting light for the display.
The display of
The layer of
The layout of
Some embodiments of the invention provide that various transmitters can be selectively disabled and enabled. Thus, some embodiments can selectively vary the number of active transmitters in order to save power (by reducing the number of active transmitters) or improve accuracy (by increasing that number). Thus, for example, transmitters 1101-1104 and 1106-1109 can be deactivated, leaving only transmitter 1105 active. This can result in significant power savings, while reducing the accuracy (or granularity) of the proximity sensor panel. When only transmitter 1105 is active, a much larger volume (area 1120 and the volume above it) is being served by that transmitter. This can reduce the accuracy of the sensor panel as a tradeoff of saving power.
In some embodiments, the sensor panel is part of a device that dynamically determines a required accuracy depending on a task that is currently performed and activates/deactivates transmitters accordingly in order to provide the desired accuracy while conserving power.
In some embodiments, all IR receivers can be kept operational, because the receivers themselves do not usually consume any power. In other embodiments, IR receivers can themselves be selectively turned on and off to control power and granularity, because circuitry for processing the signals produced by IR receivers may consume power.
However, in yet other embodiments, the proximity sensing functionality (i.e., the IR transmitters and receivers) can be placed in one of layers 1200, 1201, 1203, 1204 or 1205. For example, the IR transmitters and receivers can be placed in the color filter layer 1203 so as to line up with a black mask of the TFT layer.
A black mask can be a mask placed between the various pixels and/or cells of the TFT layer. Thus, as shown in
In some embodiments, the IR transmitters and receivers can be placed in any of layers 1200, 1201, 1203, 1204, and 1205 but not lined up with the black mask. Instead, alternative methods can be used to ensure that they do not interfere with the display. For example the IR transmitters and receivers can be made of transparent material or they can be of a comparatively small size.
In one alternative, the backlight layer 1200 can include an optical diffuser and the IR transmitters and receivers can be placed within that diffuser.
While embodiments of the present invention are discussed in connection with certain types of display technologies (such as LCD and OLED), they are not thus limited, but may encompass various other display technologies. While embodiments are discussed in connection with IR radiation, the invention is not thus limited. Other types of radiation can be used instead of IR radiation, and other types of known transmitters and receivers for such radiation can be used instead of IR transmitters and receivers.
Although embodiments of this invention have been fully described with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of embodiments of this invention as defined by the appended claims.
This application is a Continuation-In-Part (CIP) of U.S. application Ser. No. 11/649,998, filed Jan. 3, 2007, the contents of which are incorporated by reference herein in their entirety for all purposes.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11649998 | Jan 2007 | US |
| Child | 12172998 | US |
