Patent Publication Number: US-8994495-B2

Title: Virtual vehicle entry keypad and method of use thereof

Description:
FIELD OF THE DISCLOSURE 
     The disclosures made herein relate generally to vehicle keyless entry keypad systems and methods and, more particularly, to a virtual vehicle entry keypad comprising a light emitting device and keypad indicia that are made visible by exposure to light from the light emitting device. 
     BACKGROUND 
     In keyless entry keypad systems, a vehicle entry keypad is generally positioned on the exterior of a driver&#39;s door and is used to lock and unlock one or more doors of the vehicle. The driver uses the vehicle entry keypad for causing the driver door and/or all doors of the vehicle to become unlocked in response to successfully inputting a factory-designated or vehicle owner designated code on the vehicle entry keypad. Generally, the vehicle entry keypad is electrically coupled to an electronic controller. The electronic controller controls a mechanism to unlock/lock the vehicle in response to the designated code being successfully inputted by the driver via the vehicle entry keypad. In this manner, the vehicle entry keypad allows the driver to unlock (and lock) the doors without the use of a key. Once a valid code is recognized, other single digit entries within a short period of a few seconds, may also perform secondary functions such as releasing the decklid or opening a power liftgate. 
     In some implementations of a vehicle entry keypad, the vehicle entry keypad has been moved from the vehicle door to the B-pillar (i.e., pillar between the front door and glass immediately rearward the front door) for reasons such as cost reduction and/or improved appearance (e.g., through use of touch panel technology). Some vehicles, however, do not have a B-pillar or have a B-pillar that is too thin for practically having the vehicle entry keypad integral therewith. Placement of a vehicle entry keypad on an exterior door handle was once a common practice. However, it now has limited practicality since the handle on many vehicles now have LF antennas and capacitive lock and unlock switches to support passive entry intelligent access systems. This has result in no or limited available space within the handle. Similarly, placement of a vehicle entry keypad directly on moveable glass of the vehicle door has had limited practicality, as it requires a costly connection solution. 
     Therefore, implementation of a vehicle entry keypad that overcomes the abovementioned drawbacks and limitations would be advantageous, desirable and useful. 
     SUMMARY OF THE DISCLOSURE 
     Embodiments of the present invention are directed to implementation of a vehicle entry keypad that overcomes drawbacks and limitations associated with prior art approaches to integrating a vehicle entry keypad into a vehicle. Specifically, preferred embodiments of the present invention are directed to a virtual vehicle entry keypad comprising a ultra-violet (UV) light emitter and keypad indicia that is made visible by illumination with light from the UV light emitter. In this manner, the keypad indicia are otherwise substantially invisible to the human eye (i.e., when not being illuminated with light from the UV light emitter). A window of the vehicle has the keypad indicia integral therewith, or on the glass surface, and illumination of the UV reactive keypad indicia by UV light outputted by the UV light emitter causes the keypad indicia to become visible by the human eye. In a preferred embodiment, the keypad indicia are formed from a dye that becomes visible to the human eye while being exposed to light within the UV spectrum. When the driver grabs the door handle, a capacitive sensor or a conventional switch is used to initiate a search for a passive entry intelligent key. If no key is located, the UV emitter will be activated along with an imaging device (e.g., a camera). The imaging device monitors a sequence of finger placements on the UV illuminated keypad indicia for enabling a determination to be made as to whether a vehicle access code has been entered via the keypad indicia during its illumination by the UV light emitter. Advantageously, such an implementation of a virtual vehicle entry keypad provides for a cost effective approach to integrating the vehicle entry keypad into a window of a vehicle without adversely inhibiting visibility through the window or require costly electrical connections. 
     In one embodiment of the present invention, a keyless entry keypad system for a vehicle comprises a vehicle window, a light emitting device, and an imaging device. The vehicle window has an access code entry region integral therewith. The access code entry region includes a layer of light reactive substance that transitions from being nearly invisible to a human eye to being highly visible to the human eye when exposed to light of a specified wavelength and intensity configuration. The light emitting device is configured for outputting light of the specified configuration. The access code entry region and the light emitting device are jointly configured for causing access code entering indicia to become highly visible to the human eye within the layer of light reactive substance when the layer of light reactive substance is exposed to the outputted light. The imaging device captures user interaction with the access code entering indicia while the access code entry region is being exposed to the outputted light. 
     In another embodiment of the present invention, a keyless entry keypad apparatus of a vehicle comprises keypad indicia integral with a window of the vehicle, a light emitting device, and an imaging device. The keypad indicia is formed using a substance that transitions from being nearly invisible to a human eye to being highly visible to the human eye when exposed to light of a specified configuration. The light emitting device is configured for outputting light of the specified configuration. The keypad indicia and the light emitting device are relatively positioned for causing the keypad indicia to be exposed to the outputted light such that the keypad indicia transitions to being highly visible to the human eye. The imaging device captures user interaction with the keypad indicia while the keypad indicia are exposed to the outputted light. 
     In another embodiment of the present invention, a vehicle comprises a window having keypad indicia provided thereon, an ultra-violet (UV) light emitting device, an imaging device, and a keypad interaction processor. The keypad indicia are formed using a UV fluorescent dye that is nearly invisible to a human eye until exposed to UV light. The UV light emitting device is configured for outputting UV light. The light emitting device is mounted on the vehicle for enabling the keypad indicia to be exposed to the outputted UV light thereby causing the keypad indicia to become readily visible by the human eye. The imaging device captures user interaction with the keypad indicia while the keypad indicia is exposed to the outputted UV light. The keypad interaction processor determines if a sequence of body part movements with respect to the keypad indicia that is captured by the imaging device during exposure of the keypad indicia to the outputted light corresponds to an access code of the vehicle. 
     In another embodiment of the present invention, a method of using a virtual vehicle entry keypad that is integral with a window of a vehicle to gain access to an interior space of the vehicle comprises a plurality of operations. An operation is performed for detecting presence of a person attempting to gain access to the interior space of the vehicle through a door of the vehicle. After detecting presence of the person, an operation is performed for determining that manual access authentication is required by the person for allowing access to the interior space. In response to determining that manual access authentication is required, an operation is performed for energizing a light emitting device for causing light of a specified configuration to be outputted therefrom. The outputted light causes the virtual vehicle entry keypad to become visible by a human eye within a layer of light reactive substance integral with the window. The layer of light reactive substance is nearly invisible to the human eye when not exposed to the outputted light. Thereafter, an operation is performed for monitoring interaction between the person and the virtual vehicle entry keypad while the light emitting device is energized followed by an operation being performed for determining if the monitored interaction corresponds to successful entry of an access code required for enabling the person to gain access to the interior space of the vehicle. 
     These and other objects, embodiments, advantages and/or distinctions of the present invention will become readily apparent upon further review of the following specification, associated drawings and appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a fragmentary perspective view showing a vehicle having a virtual vehicle entry keypad configured in accordance with an embodiment of the present invention. 
         FIG. 2  shows an access code entering region in which the virtual vehicle entry keypad of  FIG. 1  becomes visible. 
         FIG. 3  is an enlarged view of the virtual vehicle entry keypad of  FIG. 1 . 
         FIG. 4  is a fragmentary side view showing a window of the vehicle in  FIG. 1 , which has an access code entry region that is suitably configured for enabling display of the virtual vehicle entry keypad. 
         FIG. 5  is a fragmentary top view showing a relative placement of a virtual keypad module and window of a door of the vehicle of  FIG. 1  on which the virtual keypad module is mounted. 
         FIG. 6  is a fragmentary side view of the door, window, and virtual keypad shown in  FIG. 5 . 
         FIG. 7  is a block diagram showing a vehicle control architecture configured in accordance with an embodiment of the present invention. 
         FIG. 8  is a flow diagram showing a method configured for implementing virtual vehicle entry keypad functionality in accordance with an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWING FIGURES 
       FIG. 1  shows a vehicle  100  configured in accordance with the present invention. As shown in  FIG. 1 , the vehicle  100  is configured with a virtual vehicle entry keypad  105 . The virtual vehicle entry keypad  105  is displayed within (i.e., integral with) a window  110  of a driver door  115  of the vehicle  100 . A person skilled in the art will appreciate that a virtual vehicle entry keypad configured in accordance with the present invention can be integral with a different window of the vehicle beside or in addition to a driver door window. 
     The virtual vehicle entry keypad  105  is selectively displayable. As shown in  FIGS. 1 and 2  and as discussed below in greater detail, the virtual vehicle entry keypad  105  can be transitioned between a state in which it is highly visible ( FIG. 1 ) to a human eye and a state where by it is nearly or entirely invisible to the human eye ( FIG. 2 ). Additionally, the region  105  can be horizontal or vertical or on any window of the vehicle  100 . It is disclosed herein that, in the context of the present invention, a windshield is considered to be a window. Advantageously, integration of the virtual vehicle entry keypad  105  into the window  110  provides for a more modern and cosmetically appealing keyless entry solution and can be readily utilized on a vehicle that does not have a B-pillar (e.g., such as on various sports-type cars, convertibles, and the like). 
     As discussed below in greater detail, a person (e.g., a driver of the vehicle  100 ) seeking to gain access to an interior space of the vehicle  100  and, optionally, to control other power systems (e.g., windows, decklid release, lift gate open, convertible top down, etc,) or to start the vehicle  100  without a physical key uses the virtual vehicle entry keypad  105  to enter an access code. In response to the access code being successfully entered, the person is granted access to the interior space of the vehicle  100  by the driver door  115  being unlocked by a keyless entry keypad system or the person is granted access to another system of the vehicle and, optionally, allowing the person to start the vehicle without a physical ignition key. As shown in  FIG. 3 , the virtual vehicle entry keypad  105  includes indicia used for entering the access code (e.g., numbers 0-9) and can include a global lock command icon indicia (e.g., text reading “lock”). 
     The virtual vehicle entry keypad  105  defines an access code entry region  120  of the window  110 . As shown in  FIG. 4 , the access code entry region  120  includes a layer of light reactive substance  125  that transitions from being entirely or nearly invisible to a human eye to being highly visible to the human eye when exposed to light of a specified configuration. In preferred embodiments, the layer of light reactive substance  120  is positioned adjacent to an interior space side  130  of the window  110  (i.e., not exposed to the exterior surface  135  of the window  110 ). As shown in  FIG. 4 , the layer of light reactive substance  125  can be positioned at an interface between an interior glass layer  146  and a polymeric layer  145  (e.g., polyvinyl butyral (PVB) layer) of the window  110  such as that of a laminate window construction having an interior glass layer  146  in addition to the exterior glass layer  140 . This preferred position reduces exposure from natural UV light from the sun. Alternatively, the light reactive substance  125  can be formed on the side of the polymeric layer  145  or the exterior glass layer  140  that faces the exterior of the vehicle  100 . It is also disclosed herein that virtual vehicle entry keypad indicia configured in accordance with the present invention can be provided on an interior surface of glazing using a sticker or ink application process. 
     In certain embodiments, light of the specified configuration is light within the ultra-violet (UV) light spectrum and the light reactive substance is a chemical composition that exhibits light fluorescing functionality when exposed to light in the UV light spectrum. A UV fluorescent dye is an example of such a chemical composition that exhibits light fluorescing functionality when exposed to light in the UV light spectrum. In this regard, a preferred wavelength for light and for light reactivity of the light reactive substance is about 405 nanometers. However, the present invention is not unnecessarily limited to a light of a particular wavelength. In embodiments where the light reactive substance is a chemical composition that is reactive to light in the spectrum within light from ambient light sources (e.g., UV light), light transmission inhibitors that are commonly used in automotive window applications (e.g., within or on the exterior glass layer  140  of window  110 ) will significantly reduce if not eliminate the potential for ambient light causing the virtual vehicle entry keypad  105  from unintentionally becoming visible due to such ambient light. 
     A UV fluorescent dye of a type preferable for use with embodiments of the present invention will emit high energy at the proper wavelength to become highly visible and the resulting glow gives the appearance of high uniform density. Such a preferred UV dye can be applied at a concentration that will cause it to light-up (i.e., fluoresce which chases them to become visible) when radiated with correct irradiance (i.e., by light at a target wavelength), but does not cause it to light-up under ambient light. Accordingly, molecular density of such a preferred UV fluorescent dye will be relatively low (i.e., a relatively low spatial density) so that transparency is achieved at normal visible light spectrums but spaced properly to achieve uniform appearance at the target wavelength. To this end, in general, a UV fluorescent dye of a type preferable for use with embodiments of the present invention can have a molecular construct in the scale of about 10^2 nanometers to about 10^5 nanometers. For example, a UV fluorescent dye of a type preferable for use with embodiments of the present invention can be a Rylene type dye, which can be considered to have a nano-construct and be a nano-emitter. 
     Referring now to  FIGS. 5 and 6 , a virtual keypad module  142  is mounted on the door  115  of the vehicle  100 . For example, the virtual keypad module  142  can be mounted on an interior support structure  147  of the door  115  and extend through an opening in a interior trim panel  150  of the door  115  or can be mounted directly on the interior trim panel  150 . Alternatively, the virtual keypad module  142  can be mounted on a dashboard of the vehicle  100  or an instrument panel of the vehicle  100 . 
     The virtual keypad module  142  includes a light emitting device  155  and an imaging device  160 . A light emitting diode (LED) and a laser diode are two examples of the light emitting device  155 . In certain embodiments, the light emitting device  155  will output predominately light within the UV light spectrum. A camera configured to capture light in the visible light spectrum and/or infrared light spectrum is an example of the imaging device  160 . As previously mentioned, the virtual keypad module  142 , including the light emitting device  155  and an imaging device  160 , can also be fitted to any door or on the instrument panel for illumination and image detection off the windshield. Although a windshield keypad systems does not allow for good keypad ergonomics, it can significantly reduce the cost since most windshields have a PVB layer but not all side glass has PVB lamination. 
     Through selective operation of the light emitting device  155 , the virtual vehicle entry keypad  105  can be made accessible (i.e., visible) to a person for interaction therewith. As shown in  FIG. 6 , The virtual keypad module  142  is positioned relative to the window  110  for enabling an entire portion of the access code entry region  120  of the window  110  to be exposed to light being emitted from the light emitting device  155  and for enabling the imaging device  160  to capture an image of interaction between a person and the virtual vehicle entry keypad  105  while the access code entry region  120  is being exposed to light being emitted from the light emitting device  155 . In this regard, interaction between the person and the virtual vehicle entry keypad  105  can be monitored while the person is attempting to successfully enter an access code via the virtual vehicle entry keypad  105 . 
     In view of the disclosures made herein, a skilled person will appreciate that there are a number of manners in which the light reactive substance  125  can pattered to form the access code entry region  120  and the light emitting device can be correspondingly configured. For example, in one embodiment (i.e., a broadcast light embodiment), the layer of light reactive substance  125  is formed in the shape and/or pattern of the virtual vehicle entry keypad  105  using an UV light reactive composition such that broadcasting of UV light from the light emitting device  155  onto the access code entry region  120  causes the virtual vehicle entry keypad  105  to become visible. In another embodiment (i.e., a laser projection embodiment), the layer of light reactive substance  125  is formed in the shape of a substantially solid area (e.g., a rectangle without static keypad indicia) using an UV light reactive composition and UV light from the light emitting device  155  (i.e., implemented as a laser) is projected or scanned onto the access code entry region  120  in a manner that causes an image of the virtual vehicle entry keypad  105  to be generated within the layer of light reactive substance  125 . Use of a light emitting device configured as a laser allows configurability for different modes and different purposes such as a numeric keypad keyboard, alpha keypad, textual feedback on locking states, and also providing numbers, letters and words customized to the language of the country of sale or the language selected by the vehicle operator. Additionally, use of a laser projection implementation of the virtual vehicle entry keypad on a solid keypad access area allows flexibility to create custom images and fonts for styling purposes. A preferred embodiment of the laser projection embodiment integrates an optical touch camera with the projection hardware in an assembly similar to a borescope or endoscope, using relay lens assemblies or coherent optical fiber bundles to carry the projected image to the screen area and the viewed image back to the camera sensor. An exit pupil of the projection optic may be positioned on the top edge of the door trim, in or near the area typically used for the mechanical door lock knob, and the main bulk of the camera and projector may be packaged out of sight between the door inner panel and the door trim. Alternatively, the exit pupil may be positioned within the lock knob (i.e., lock soldier) in such a way that it can project the image pattern onto the target area of the glass and sense gestures in that area if required for an optical touch sensing system. Another advantage of the laser embodiment is that lock status can be indicated on the keypad zone  105 . The word “LOCK” as shown in  FIG. 3  could be transitioned to “LOCKED” shortly after the lock command is executed and then displayed as LOCKED for a few seconds. Furthermore, confirmation of a transition to the locked state can be visually confirmed by a visual queue depicted via the virtual vehicle entry keypad  105 . For example, a fast blink of the virtual vehicle entry keypad  105  can serves as a confirmation that the vehicle has transitioned to a locked state. 
     Turning now to a discussion of  FIG. 7 , a vehicle control architecture  200  configured in accordance with an embodiment of the present invention is shown. The vehicle control architecture  200  includes a virtual keypad module  205 , a vehicle control module  210 , a driver detection device  215 , and an ambient light sensor  217 . The vehicle control module  210  is coupled between the virtual keypad module  205 , the driver detection device  215 , and the ambient light sensor  217 . The vehicle control module  210  can be configured in accordance with an industry-recognized body control module (BCM) for providing functionality well known to be provided thereby, which includes receiving signals from the driver detection device  215  (e.g., a Passive Entry Passive Start device (PEPS) signal from the person attempting to gain access to the vehicle or grip sensors in the door handle that detect a handle grab), determining if manual access authentication is required (e.g., successful entry of an access code into a vehicle entry keypad), and outputting appropriate control signals in response to either the PEPS signal being detected or the access code being successfully manually entered (e.g., a signal causing a door lock to be moved from a locked state to an unlocked state). The driver detection device  215  can be a door handle configured for outputting a signal corresponding to contact/movement of the door handle being detected and/or presence of a PEPS transponder being detected (e.g., the person seeking to gain access to the vehicle having a PEPS transponder in their possession). Although the keypad would not be needed for entry when the person possess the PEPS device, detection of the PEPS device and display of other potential functions on the virtual detection zone  105  would allow more features to be executed from the outside of the vehicle than are practical to place on the PEPS device as buttons. The list of expanded features could include those discussed previously (e.g., decklid, window, moon roof, top, and gate controls) plus additional features such as audio or light controls displayed on the glass to allow the customer to control radio stations, volume, media modes and the like from the exterior of the vehicle for events such as, for example, tailgate parties or lighting the area, for campouts or night time sledding. 
     The virtual keypad module  205  can be configured in the same or similar manner as the virtual keypad module  142  discussed above in reference to  FIGS. 5 and 6 . In addition to having a light emitting device  220  and an imaging device  225  (e.g., the same or similar as the light emitting device  155  and the imaging device  160  discussed above in reference to  FIG. 5 ), the virtual keypad module  205  includes a keypad interaction processor  230  and a virtual keypad controller  235 . The keypad interaction processor  230  uses information received from the visible light camera to determine if a sequence of body part movements with respect to keypad indicia of the virtual vehicle entry keypad corresponds to an access code of the vehicle. For example, during operation of the light emitting device  220 , the imaging device  225  captures a sequence of finger movements with respect to access code entering indicia of the virtual vehicle entry keypad and then determines if such finger movements correspond to the vehicle access code having been entered at the virtual vehicle entry keypad. The virtual keypad controller  235  can control operation/activation of the light emitting device  220 , the imaging device  225  and the keypad interaction processor  230 . The virtual keypad controller  235  can also interface with the vehicle control module  210  for enabling information (e.g., command signals) to be communicated therebetween. Using information such as that provided by the ambient light sensor  217 , the virtual keypad controller  235  can also be configured for determining an ambient light level and/or a solar intensity level, determining an illumination intensity for the light emitting device dependent upon the ambient light level and/or the solar intensity level, and then cause the light emitting device to be energized in a manner that causes light outputted from the light emitting device to be at the illumination intensity appropriate for best keypad viewing in the detected ambient light conditions. Electrical power can be provided directly to the virtual keypad module  205  from a power source or can be provided to the virtual keypad module  205  through the vehicle control module  210 . 
       FIG. 8  shows a method  300  configured for implementing virtual vehicle entry keypad functionality in accordance with an embodiment of the present invention. The method  300  begins with operation  305  for detecting presence of a person attempting to gain access to the interior space of the vehicle through a door of the vehicle. Such detection can include receiving signals from a door handle of the vehicle (e.g., movement thereof and/or contact therewith). After detecting presence of the person, an operation  310  is performed for determining that manual access authentication is required by the person for allowing access to the interior space. For example, a step of detecting possession of and authentication from a PEPS transponder can have failed thereby requiring manual authentication of the person. 
     In response to determining that manual access authentication is required, an operation  315  is performed for determining if the access code entry region is sufficiently accessible to the person for enabling display of and interaction with the virtual vehicle entry keypad. Specifically, a condition in which all or a portion of the access code entry region would not be accessible if the window was in a sufficiently lowered position (e.g., such as for allowing venting of the vehicle). If it is determined that the access code entry region is not sufficiently accessible due to the window being in a fully or partially lowered position, an operation  320  is performed for repositioning the window (e.g., fully or partially raising it). Thereafter, or if it was determined that the access code entry region was already accessible, the method  300  continues at an operation  325  for determining an illumination intensity level for the light emitting device. In one embodiment, determining the illumination intensity level includes determining an ambient light level and/or a solar intensity level and then determining an illumination intensity to which the light emitting device should be activated to achieve. Determining the ambient light level can include receiving light intensity information from the imaging device and/or receiving solar intensity information from a sun load sensor. An operation  330  is then performed for energizing the light emitting device for light to be outputted at the required illumination intensity level thereby causing the virtual vehicle entry keypad to become visible by a human eye within a layer of light reactive substance integral with the window at the access code entry region. As discussed above, the layer of light reactive substance is nearly invisible to the human eye when not exposed to the outputted light from the light emitting device. 
     Next, an operation is performed for monitoring interaction between the person and the virtual vehicle entry keypad by an imaging device while the light emitting device is energized. In response to or in conjunction with monitoring the monitoring interaction between the person and the virtual vehicle entry keypad, an operation  340  is performed for determining if the monitored interaction corresponds to successful entry of an access code required for enabling the person to gain access to the interior space of the vehicle and, optionally, to control various function and/or to start the vehicle without a physical key. In response to it being determined that the access code has been successfully entered, an operation  345  is performed for granting access to the interior space of the vehicle (e.g., causing one or more doors to be unlocked) and, optionally, allowing the person control various function and/or to start the vehicle without the use of a physical (i.e., ignition) key. Otherwise, an operation  350  is performed for denying the person access to the interior space of the vehicle. 
     Referring now to instructions processable by a data processing device, it will be understood from the disclosures made herein that methods, processes and/or operations adapted for carrying out virtual vehicle entry keypad functionality as disclosed herein are tangibly embodied by computer readable medium having instructions thereon that are configured for carrying out such functionality. In one specific embodiment, the instructions are tangibly embodied for carrying out the method  300  disclosed above. The instructions may be accessible by one or more data processing devices from a memory apparatus, from an apparatus readable by a drive unit of a data processing system, or both. Accordingly, embodiments of computer readable medium in accordance with the present invention include a compact disk, a hard drive, RAM, Flash memory, or other type of storage apparatus that has imaged thereon a computer program (i.e., instructions) adapted for carrying out virtual vehicle entry keypad functionality in accordance with the present invention. 
     In the preceding detailed description, reference has been made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the present invention may be practiced. These embodiments, and certain variants thereof, have been described in sufficient detail to enable those skilled in the art to practice embodiments of the present invention. It is to be understood that other suitable embodiments may be utilized and that logical, mechanical chemical and electrical changes may be made without departing from the spirit or scope of such inventive disclosures. To avoid unnecessary detail, the description omits certain information known to those skilled in the art. The preceding detailed description is, therefore, not intended to be limited to the specific forms set forth herein, but on the contrary, it is intended to cover such alternatives, modifications, and equivalents, as can be reasonably included within the spirit and scope of the appended claims.