Interior/exterior component with electroluminescent lighting and soft touch switching

A light panel includes an outer layer, a first proximity switch, an electroluminescent element and a base portion. The outer layer includes a translucent portion. The first proximity switch is disposed beneath the outer layer and has first and second electrically conductive switch portions that are arranged to form an electric field that emanates through the outer layer when the first proximity switch is energized. The electroluminescent element is disposed beneath the outer layer to provided backlighting to the outer layer. One of the first and second electrically conductive switch portions of the first proximity switch forms at least a portion of an electrode of the electroluminescent element. The base portion is disposed beneath the electroluminescent element and the first proximity switch.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to a light panel with an integrated switch. More specifically, the present invention relates to a light panel having a proximity switch and an electroluminescent element where an electrode of the electroluminescent element is at least partially defined by an electrically conductive portion of the proximity switch.

2. Background Information

A proximity switch is a device that includes a structure that generates a magnetic field and circuitry that detects the proximity of an object (such as a finger) that disturbs the electric field when close to or in contact with the surface of the proximity switch. Proximity switches are gradually being integrated into a variety of technologies, including the automotive industry for use in interior switch applications. One of the advantages of proximity switches is that they require very little space compared to mechanical switch technologies such as push-push switches, knobs and rocker switches.

Another technology that is becoming increasingly useful in automotive interior applications is electroluminescent film or electroluminescent element lighting. Like proximity switches, electroluminescent films requires very little space compared to other lighting technologies such as incandescent light bulbs and LEDs (Light Emitting Diodes)

Currently proximity switch applications in automotive interiors include LEDs for switch backlighting. The basic proximity switch assembly includes an A-surface faceplate with screen printed translucent graphics. A light lens (or diffusion layer) adheres directly to the back of the A-surface faceplate. Below the light lens is an electronics layer that houses the LED light sources positioned below the face plate graphics and the proximity switch sensing pads. These switches take up an undesirable amount of space.

In view of the above, it will be apparent to those skilled in the art from this disclosure that there exists a need for an improved proximity switch with backlighting that takes up little space within a vehicle. This invention addresses this need in the art as well as other needs, which will become apparent to those skilled in the art from this disclosure.

SUMMARY OF THE INVENTION

It has been discovered that mechanical switches can be replaced with electronic proximity switches in order to reduce the size of switch assemblies in vehicles. It has also been discovered that electroluminescent devices or elements can be used to backlight switches to further reduce the size of switch assemblies in vehicles.

One object of the present invention is to combine a proximity switch with an electroluminescent element to reduce packaging space required for backlit switches in automotive applications.

Accordingly, in accordance with one aspect of the present invention, a light panel is provided with an outer layer, a first proximity switch, an electroluminescent element and a base portion. The outer layer includes a translucent portion. The first proximity switch is disposed beneath the outer layer and has first and second electrically conductive switch portions that are arranged to form an electric field that emanates through the outer layer when the first proximity switch is energized. The electroluminescent element is disposed beneath the outer layer to provided backlighting to the outer layer. One of the first and second electrically conductive switch portions of the first proximity switch forms at least a portion of an electrode of the electroluminescent element. The base portion is disposed beneath the electroluminescent element and the first proximity switch.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In order to more clearly describe the various embodiments of the present invention, several terms are now defined as used herein below. The term “transparent” as used herein refers to materials through which light is easily transmitted and through which visible objects, images and graphics can easily be discerned with the naked eye. For instance, clear glass and clear plastic materials are transparent. The term “translucent” as used herein refers to materials through which light is readily transmissible, but somewhat diffused such that objects, images and graphics are discernable with some difficulty through the material. Specifically, objects, images or graphics behind a translucent material are not as easily discerned compared to visibility through transparent materials. More specifically, a translucent material can be semi-transparent, but is not as transparent as clear glass. The term “semi-translucent” as used herein refers to materials through which light is readily diffusible, but through which visible objects are generally obscured. An example of a semi-translucent material is a frosted glass through which light passes, but visible objects or images behind that material are not easily discerned by the naked eye. The shadow or outline of a visible object behind a semi-translucent material can be discerned, but the diffusion of light by the semi-translucent material obscures most if not all details of the visible object. The term “opaque” as used herein refers to materials through which light cannot pass, or materials that significantly restrict transmission or diffusion of light. The term opaque as used herein can include materials that allow some slight amount of diffusion or transmission of light, but significantly less diffusion or transmission of light than a semi-translucent material. The terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. For example, these terms can be construed as including a deviation of at least ±5% of the modified term if this deviation would not negate the meaning of the word it modifies.

Referring initially toFIG. 1, a vehicle10is illustrated in accordance with a first embodiment of the present invention. As shown inFIG. 2, the vehicle10includes a passenger compartment11that is provided with several light panels in accordance with a variety of embodiments of the present invention. For example, the passenger compartment11is fitted with a center console12, a visor14, a headliner console16, a door armrest18and a dashboard20. The light panels in accordance with the present invention include a shifter light panel22mounted to the center console12, a plurality of mirror light panels24mounted to the visor14, a plurality of map light panels26mounted to the headliner console16, a switch light panel28mounted to the door armrest18and a lighted panel30mounted to the dashboard20. Each of the light panels of the present invention is described below in greater detail. Further, a light panel32is fitted to the exterior of the vehicle10as a part of a door handle assembly, as described below.

First Embodiment

In accordance with a first embodiment of the present invention, a description of the shifter light panel22is now provided with specific reference toFIGS. 3,4and5. The shifter light panel22is, for example, a transmission shifter lever cover, bezel or trim piece that at least partially forms a portion of the center console12in the passenger compartment11of the vehicle10. The shifter light panel22is formed with an aperture23through which a transmission shifter lever33extends. The shifter light panel22includes indicia34adjacent to the aperture23that marks locations for positions of the shifter lever33. The indicia34are also herein referred to as visible graphics.

The shifter light panel22is a multilayered unit that includes a series of layers, which each layer formed with an aperture corresponding to the aperture23as shown inFIG. 4. The layers of the shifter light panel22form both a lighting source and a switch for turning the lighting source on and off, as is described in greater detail below.

It should be understood from the drawings and the description herein that the various layers of the shifter light panel22depicted inFIG. 4are depicted with thicknesses and sizes that are purely schematic and do not represent actual dimensional relationships. For example, some layers may be thicker or thinner than other layers for illustrative purposes only. The actual thickness and size of each layer depends upon design criteria and engineering considerations for the location and purpose of each lighting panel. Further, it should be understood from the drawings and description herein that the exploded layers depicted inFIG. 4are for illustrative purposes only. Some of the layers depicted inFIG. 4are printed or coated materials that are not necessarily separable from the adjoining layers, but are adhered there to. Therefore, the separation of layers and elements of the depiction inFIG. 4is for the purpose of showing the separate nature of the layers which are difficult to separate once the shifter light panel22is manufactured.

As shown inFIGS. 4 and 5, the shifter light panel22basically includes an outer layer36, a switch portion38, an electroluminescent element40and a base portion42. The outer layer36is preferably made of a translucent or semi-translucent material such as plastic and includes the indicia34. The indicia34are preferably opaque. However, if the outer layer36is made of a transparent or translucent material, the indicia34can be printed on an under side of the outer layer36. If the outer layer36is made of a semi-translucent material, the indicia34can be printed on an outer or exposed side of the outer layer36.

It should be understood from the drawings and the description herein that the areas of the outer layer36that do not include the indicia34constitute a translucent portion or semi-translucent portion of the outer layer36thereby allowing light to diffuse from the electroluminescent element40into the passenger compartment11of the vehicle10. Alternatively, the indicia34on the outer layer36can be translucent and the remainder of the outer layer36can be coated or otherwise treated to make the remainder of the outer layer opaque. Specifically, the indicia34can be the translucent portion of the outer layer36and therefore illuminated by the electroluminescent element40in an alternative configuration.

The switch portion38is preferably a layer or layers of electrically conductive translucent material(s) printed or otherwise provided onto the underside of the outer layer36. For example, the switch portion38can be printed using known printing techniques or a conductive layer of material can be applied to the underside of the outer layer36and unnecessary areas etched or otherwise removed from the outer layer36to form the switch portion38.

The switch portion38includes an array of proximity switches44and a pair of conductive portions46and48, as shown inFIG. 4. The array of proximity switches44includes a plurality of small proximity switches44athat work in concert as a single switch to turn the electroluminescent element40on and off, as is described in greater detail below. The conductive portions46and48are not necessarily part of the array of proximity switches44, as described further below.

FIG. 5shows one of the small proximity switches44athat make up the array of proximity switches44. Each of the small proximity switches44aof the array of proximity switches44includes a first electrically conductive switch portion50and a second electrically conductive switch portion52. Both the first electrically conductive switch portion50and the second electrically conductive switch portion52are translucent. The first electrically conductive switch portions50in the array of proximity switches44are electrically separated and spaced apart from the second electrically conductive switch portions52.

As mentioned above, the first and second electrically conductive switch portions50and52can be printed directly to the underside of the outer layer36at the same time. However it should be understood from the drawings and the description herein that the first electrically conductive switch portions50can be printed separately from the second electrically conductive switch portions52. Further, the first electrically conductive switch portions50can be coated with an electrically insulating coating prior to printing of the second electrically conductive switch portions52to ensure electrical separation thereof. Likewise, the second electrically conductive switch portions52can be coated with an electrically insulating coating prior to printing of the first electrically conductive switch portions50to ensure electrical separation therefrom.

Each of the proximity switches44aof the array of proximity switches44operates in generally the same manner. Therefore description below of one proximity switch applies to all the proximity switches44awithin the array of proximity switches44.

A single set of the first and second electrically conductive switch portions50and52is shown diagrammatically inFIGS. 6,7and8to demonstrate the operation of the proximity switch44aand each of the proximity switches in the various embodiments described below.

As shown inFIG. 6, the second switch portion52surrounds the first switch portion50but is spaced apart therefrom. InFIG. 6, the proximity switch44ais depicted with a generally square or rectangular shape. It should be understood that each proximity switch44acan alternatively have a circular shape. Further, the proximity switches44acan be formed by rows of side by side elongated conductive strips that are electrically separated and spaced apart from one another.

The first and second electrically conductive switch portions50and52are connected to a controller56by power lines58and60, respectively as shown inFIGS. 6,7and8. The controller56is supplied with DC electricity by power lines62and64from, for example, a battery65within the vehicle10. The controller56includes conventional circuitry (not shown) that converts the DC electricity to AC electricity. The controller56is also provided with power lines66and68that are connected to the electroluminescent element40(as described further below).

It should be understood from the drawings and the description herein that in the first embodiment of the present invention the power lines58and60are connected to every one of the first and second electrically conductive switch portions50and52, respectively, of all the proximity switches44ain the array of proximity switches44. Therefore, the array of proximity switches44acts as a single switch. Further, for one or more of the proximity switches44a, at least a portion of the first and second electrically conductive switch portions50and52are applied on the outer layer36to at least partially coincide with the translucent portion. Further, at least a portion of one or more of the first electrically conductive switch portions50is at least partially disposed directly beneath the indicia34(the visible graphic).

The proximity switch44operates as follows. When activated by a supply of AC power from the controller56, the electric potential between the second switch portion52and the first switch portion50creates a magnetic field M indicated inFIG. 7. The controller56includes conventional attenuated circuitry and/or programming that detect fluctuations in the magnetic field M resulting from proximity or touch of a human finger F, as indicated inFIG. 8. Once the controller56detects a disturbance in the magnetic field M, such as that depicted inFIG. 8, the electroluminescent element40is supplied with power, thereby causing it to illuminate.

The controller56operates as follows, as shown inFIG. 9. As step S1, power is provided to the controller56, for example, when the vehicle10is operating or when the ignition switch (not shown) is turned on. The controller56supplies power to each of the proximity switches44asuch that each of the proximity switches44ain the array of proximity switches44generates the magnetic fields M depicted inFIG. 7. The controller56senses for any activity in any one or any group of the proximity switches44ain the array of proximity switches44. At step S2inFIG. 9, the controller senses an input from one or more of the proximity switches44a, for example, a disturbance by the finger F (FIG. 8) of a passenger or driver within the vehicle10is such an input. At a decision step S3, the controller56determines whether or not the electroluminescent element40is illuminated or not (on or off). If the electroluminescent element40is off, then the controller56turns the electroluminescent element40on, as indicated at step S4. If the electroluminescent element40is on, then the controller56turns the electroluminescent element40off, as indicated at step S5. At step S6, the controller56ends by, for example, returning to step S1and waits for subsequent input from the array of proximity switches44.

The controller56is configured to sense magnetic field perturbations in any one of the proximity switches44a, or any group of the proximity switches44aof the array of proximity switches44. Consequently, a driver or passenger of the vehicle10can touch the shifter light panel22or bring their finger F in close proximity to the shifter light panel22and cause the electroluminescent element40to either illuminate or stop illuminating (turn on or turn off). The proximity or touch of the finger F can be anywhere on the shifter light panel22.

The electroluminescent element40is now described in greater detail with reference toFIGS. 4 and 5. The electroluminescent element40is disposed beneath the outer layer36to provided backlighting to the outer layer_36. More specifically, the electroluminescent element40provides illumination to highlight the indicia34printed on the outer layer.

As shown inFIG. 5, the electroluminescent element40includes a first electrode70, phosphor and dielectric materials72, and a second electrode74, with the phosphor and dielectric materials72disposed between the first and second electrodes70and74. In the first embodiment, the first electrode70is formed by some or all of the first electrically conductive switch portions50of each proximity switch44awithin the array or proximity switches44, and the conductive portions46and48. As shown inFIG. 5, the conductive portion46(and48) is connected to the power line66. The first electrically conductive switch portions50can be connected to the power line66(not shown) or, are preferably connected to the power line66via circuitry within the controller56in order to serve as part of the first electrode70of the electroluminescent element40. Therefore, a portion of each proximity switch44aof the array of proximity switches44acts as a part of the first electrode70.

The phosphor and dielectric materials72are depicted as a single layer inFIGS. 4 and 5but are preferably separate layers with the phosphor separate from the dielectric material. Alternatively, the phosphor and dielectric materials72can be a single layer that includes a mixture of the two materials.

The second electrode74is preferably a conductive layer of metallic material. The second electrode74can include any of a variety of electrically conductive materials. Preferably the second electrode74includes a material that has a high amount of reflectivity in order to maximize the light emitted from the electroluminescent element40. As shown inFIG. 5, the second electrode74is connected to the power line68.

The electroluminescent element40works in a conventional manner. Specifically, when the controller56switches on the electroluminescent element40, AC current is provided to the power lines66and68. The fluctuating magnetic fields generated between the first and second electrodes70and74, excites the phosphor causing it to produce light.

The base portion42is disposed beneath the electroluminescent element40and the array of proximity switches44. The base portion42includes attachment portions76. The attachment portions76are shown schematically in the drawings, but can be snaps, clips, springs, apertures for receiving fasteners, or fasteners that attach to corresponding attachment receiving members (not shown) formed in center console12in the vehicle10.

The base portion42is depicted inFIGS. 4 and 5as having a thickness greater that the outer layer36, the switch portion38and the electroluminescent element40. Preferably, the base portion42is thicker in order to provide a generally rigid support for the switch portion38. The base portion42preferably has a shape corresponding to the outer layer36.

Although the shifter light panel22is depicted as having a generally planar shape, the shifter light panel22can be provided with a three dimensional profile. For instance the shifter light panel22can have a curved contour to blend in with the adjacent shapes and contours of the center console12in the passenger compartment11. Further, the shifter light panel22and the various portions that make up the shifter light panel22are depicted with a somewhat round shape. It should be understood from the drawings and description herein that the shifter light panel22can be formed in any of a variety of shapes. Specifically, the shifter light panel22can also be formed with a square or rectangular shape. Alternatively, the shifter light panel22can be formed with an elliptical or oblong shape to suit the design criteria of the center console22. The depicted shape of the shifter light panel22is merely one example of a variety of possible shapes.

The mirror light panels24and the map light panels26are similar to the shifter light panel22except that the mirror light panels24and the map light panels26are not necessarily provided with the indicia34. The mirror light panels24and the map light panels26are constructed and operated in generally the same manner as the shifter light panel22. For instance, the mirror light panels24and the map light panels26include the array of proximity switches44. The driver or passenger within the passenger compartment11touches either the mirror light panels24or the map light panels26and they turn on if they are off, or turn off if they are on. Since the mirror light panels24and the map light panels26are provided to give off an appreciable amount of light, the mirror light panels24and the map light panels26are constructed with more transparent materials to maximize the amount of light emitted by their respective electroluminescent elements40. As indicated inFIG. 2, the mirror light panels24are generally flat and are located on either side of a mirror in the visor14. However, the map light panels26are formed with a three dimensional surface profile or contoured shape to blend in with the shape of the headliner console16.

Since the construction and operation of the mirror light panels24and the map light panels26are generally the same as the shifter light panel22, further description is omitted for the sake of brevity.

It should be appreciated that light panels, such as the shifter light panel22, the mirror light panels24and the map light panels26constructed in accordance with the first embodiment of the present invention, can be molded and shaped to fit many different engineering and automotive applications and are not confined to the shapes and relative sizes depicted inFIGS. 2-5.

Second Embodiment

The switch light panel28is, for example, a window control panel that controls the operation of driver and passenger side windows. The switch light panel28includes seven separate areas of indicia134athrough134g(visible graphics). Indicia134aand134bare headings that identify driver and passenger switch areas of the switch light panel28. The indicia134cthrough134goverlay separate proximity switches144athrough144eand indicate the function of each of the proximity switches144athrough144e, as described in greater detail below. It should be understood from the drawing and the description of the invention that the number of switches on the switch light panel28is variable. Five proximity switches144athrough144eare depicted for illustrative purposes only. For example, rear seat up and down window switches can also be added to the switch light panel28.

As shown inFIGS. 11 and 12, the switch light panel28basically includes an outer layer36′, a switch portion38′, an electroluminescent element40′ and a base portion42′. The outer layer36′ is preferably made of a translucent or semi-translucent material such as plastic and includes the indicia134athrough134gprinted thereon. The indicia134athrough134gare preferably opaque. If the outer layer36′ is made of a translucent material, the indicia134athrough134gcan be printed on an under side of the outer layer36′. If the outer layer36′ is made of a semi-translucent material, the indicia134athrough134gcan be printed on an outer or exposed side of the outer layer36′. The outer layer36′ generally differs from the outer layer36of the first embodiment in size and shape and also lacks the aperture formed in the outer layer36.

The electroluminescent element40′ and a base portion42′ are similar to the electroluminescent element40and the base portion42of the first embodiment except that their shape and use differs from the shifter light panel22and they include no apertures. The description of the electroluminescent element40and the base portion42of the first embodiment is generally applicable to the electroluminescent element40′ and the base portion42′ of the second embodiment. For instance, the base portion42′ includes attachment portions76. Therefore, for the sake of brevity and to avoid repetition, description is provided for only those features of the electroluminescent element40′ and a base portion42′ in the second embodiment that differ from the first embodiment.

One of the differences between the first and second embodiments is as follows. In the second embodiment, each of the outer layer36′, the switch portion38′, electroluminescent element40′ and the base portion42′ are formed with three dimensional surface profiles. Specifically, in the region around each of the proximity switches144athrough144e, a protrusion or raised area is formed in the switch light panel28, one raised area for each of the proximity switches144athrough144e, as indicated inFIG. 11.

The switch portion38′ differs from the switch portion38of the first embodiment in that the plurality of separate proximity switches144athrough144eof the switch portion38′ are printed or otherwise provided on the underside of the outer layer36′. Each of the proximity switches144athrough144eincludes first electrically conductive switch portions50athrough50e, and second electrically conductive switch portions52athrough52e, respectively, as indicated inFIGS. 11 and 12. The switch portion38′ is further provided with a conductive portion146that surrounds the proximity switches144athrough144ebut is electrically separated or insulated therefrom. The conductive portion146and each of the first electrically conductive switch portions50athrough50eof the proximity switches144athrough144eserves as a first electrode70′ of the electroluminescent element40′.

Each of the proximity switches144athrough144eworks separately and independently from one another. More specifically, the proximity switches144athrough144edo not form an array of switches, unlike the array of proximity switches44in the first embodiment. Each of the proximity switches144athrough144eoperates separately and independently of each other, as is explained in greater detail below.

As shown inFIG. 11, each of the proximity switches144athrough144eis connected to a controller156. The controller156is further connected to a remote switch158, a driver's side window motor166, a passenger side window motor168and a power source, such as the battery65. The driver's side window motor166and the passenger side window motor168are remote devices controlled by the controller156in response to inputs from the proximity switches144athrough144e.

In the second embodiment, the remote switch158sends a signal to the controller156which then turns the electroluminescent element40′ on or off. The remote switch158can be any of a variety of passenger operated switches within the vehicle10, or any combination of switches. For example, the remote switch158can be a door jam switch (not shown) that turns the electroluminescent element40′ on when a vehicle door is open and off when the door is shut. Similarly, the remote switch158can be a headlamp switch (not shown) that turns the electroluminescent element40′ on and off along with headlights on the vehicle10. As well, the remote switch158can be an interior light switch (not shown) that turns the electroluminescent element40′ on and off along with interior lights within the vehicle10.

The controller156is configured such that when the proximity switch144ais pressed, the controller156operates the driver's side window motor166to raise the window. When the proximity switch144cis pressed, the controller156operates the driver's side window motor166lower the window. Similarly, when the proximity switch144bis pressed, the controller156operates the passenger's side window motor168to raise the window. When the proximity switch144dis pressed, the controller156operates the passenger's side window motor168lower the window. Lastly, when the proximity switch144eis pressed, the controller156locks both the driver's side and the passenger's side window motors166and168thereby preventing their operation. Similarly, if the windows are locked, when the proximity switch144eis pressed, the controller156unlocks them allowing the operation of both the driver's side and the passenger's side window motors166and168.

It should be understood from the drawings and the description herein that each of the proximity switches144athrough144eoperates independently from one another in accordance with the description provided above inFIGS. 6,7and8with respect to a single switch, such as one of the proximity switches44a. Specifically, when a passenger's finger is close to or touches one of the proximity switches144athrough144e, the magnetic field generated between respective pairs of the first electrically conductive switch portions50athrough50eand second electrically conductive switch portions52athrough52eprovides an input to the controller156. The controller156includes circuitry or control logic programming that enables the controller156to distinguish an input from of the proximity switches144athrough144e.

FIG. 13is a flowchart outlining the basic functions of the controller156. In response to detection of finger proximity or finger contact with any of the proximity switches144athrough144eof the switch light panel28a specific operation is performed. At step S10inFIG. 13, the controller156is provided with power from the battery65(FIG. 11). The controller156activates each of the proximity switches144athrough144e. Specifically, a magnetic field is created between respective pairs of the first electrically conductive switch portions50athrough50eand the second electrically conductive switch portions52athrough52e. At step S11, the controller156senses an input (contact or finger proximity) from proximity switch N, where N is one of the proximity switches144athrough144e. At step S16, the controller156determines whether or not proximity switch144ehas been pressed or not. The proximity switch144ecorresponds to locking and unlocking the windows. If the proximity switch144ehas been pressed, at step S17the controller determines whether or not the windows are in a locked state or an unlocked state. If the windows are not locked, at step S18operation of the windows is put in a locked status and the windows do not operate. In step S17, if the windows are in the locked state, then at step S19the controller156unlocks the windows (puts them in an unlocked state) and allows them to operate in response to future proximity switch inputs.

In step S16, if the controller156determines that a proximity switch other than the proximity switch144ehas been pressed, then at step S20a determination is made concerning the locked state of the windows. If the windows are in the locked state, then no action is taken.

At step S20, if the windows are not in the locked state, then at step S21the action corresponding to the proximity switch N is executed. Specifically, if an input is received by the controller156from the proximity switch144a, then the driver's side window motor166is operated to raise the driver's side window. If an input is received by the controller156from the proximity switch144c, then the driver's side window motor166is operated to lower the driver's side window. Similarly, if an input is received by the controller156from the proximity switch144b, then the passenger's side window motor168is operated to raise the passenger's side window. If an input is received by the controller156from the proximity switch144d, then the passenger's side window motor168is operated to lower the passenger's side window.

At step S22, the controller156returns to step S10and awaits further proximity switch input.

Third Embodiment

Referring now toFIG. 14, a flowchart is shown demonstrating operation of the switch light panel28in accordance with a third embodiment of the present invention will now be explained. In view of the similarity between the second and third embodiments, the parts of the third embodiment that are identical to the parts of the second embodiment will be given the same reference numerals as the parts of the second embodiment. Moreover, the descriptions of the parts of the third embodiment that are identical to the parts of the second embodiment may be omitted for the sake of brevity.

In the third embodiment, the controller156of the second embodiment can be configured to operate in a manner slightly different that shown inFIG. 13.

Specifically, as shown inFIG. 14, the controller156of the third embodiment is programmed to turn on the electroluminescent element40′ in response to input from any one of the proximity switches144athrough144e.

For instance, as indicated in step S13inFIG. 14, in response to an input from any one of the proximity switches144athrough144ethe controller156first determines whether or not the electroluminescent element40′ is on or not. If the electroluminescent element40′ is not on (not illuminated) then at step S14, the electroluminescent element40′ is turned on. The controller156then awaits further input from any one of the proximity switches144athrough144e. In step S13, if the electroluminescent element40′ is already illuminated, then the controller156proceeds to step S16and operations of the controller156continue in a manner generally the same as in the second embodiment. Steps S16through S22in the third embodiment are generally the same as in the second embodiment. Therefore to avoid repetition, description of steps S16through S22is omitted.

Fourth Embodiment

Referring now toFIGS. 15,16and17, a switch light panel28″ in accordance with a fourth embodiment will now be explained. In view of the similarity between the second and fourth embodiments, the parts of the fourth embodiment that are identical to the parts of the second embodiment will be given the same reference numerals as the parts of the second embodiment. Moreover, the descriptions of the parts of the fourth embodiment that are identical to the parts of the second embodiment may be omitted for the sake of brevity. The parts of the fourth embodiment that differ from the parts of the second embodiment will be indicated with a double prime (″) or a new reference numeral.

As shown inFIG. 16, the switch light panel28″ basically includes the outer layer36′, a switch portion38″, an electroluminescent element40″ and the base portion42′. The switch light panel28″ in the fourth embodiment of the present invention includes the switch portion38″ and the electroluminescent element40″ that differ from the switch portion38′ and the electroluminescent element40′ of the second embodiment. The outer layer36′ and base portion42′ are generally unchanged.

In the fourth embodiment, the switch portion38″ includes the plurality of separate proximity switches144athrough144eof the second embodiment, but also includes an array of proximity switches144fin the areas surrounding the proximity switches144athrough144e. The proximity switches144athrough144einclude respective pairs of the first electrically conductive switch portions50athrough50eand the second electrically conductive switch portions52athrough52e.

The array of proximity switches144fis provided in the same regions of the switch portion38″ as the conductive portion146in the switch portion38′ of the second embodiment. In other words, the conductive portion146of the third embodiment is eliminated in the fourth embodiment and replaced with the array of proximity switches144f.

The array of proximity switches144fincludes a plurality of small proximity switches144f′, as indicated inFIGS. 16 and 17. Each small proximity switch144f′ includes respective first and second electrically conductive switch portions50and52, as indicated inFIG. 17. It should be understood from the drawing and the description herein that the array of proximity switches144fis similar to the array of proximity switches44of the first embodiment. Similarly, the small proximity switches144f′ are similar to the small proximity switches44aof the first embodiment.

The electroluminescent element40″ differs from the electroluminescent element40′ of the second embodiment in that an electrode70″ of the electroluminescent element40″ of the fourth embodiment is defined by the first electrically conductive switch portions50athrough50eof each of the proximity switches144athrough144eand additionally the first electrically conductive switch portions50of each of the small proximity switches144f″ in the array of proximity switches144f.

In the fourth embodiment, the array of proximity switches144fserves as an on off switch for turning on and off the electroluminescent element40″. Specifically, when a finger comes close to or touches any portion of the array of proximity switches144f, the electroluminescent element40″ is turned on or off.

As shown inFIG. 17, each of the proximity switches144athrough144e, the array of proximity switches144fand the electroluminescent element40″ is connected to a controller256. The controller256is programmed or configured to perform all the operations of the controller156. Additionally, the controller256detects whether or not one or a group of the small proximity switches144f″ of the array of proximity switches144fhas provided an input or not to turn on or off the electroluminescent element40″.

FIG. 18is a flowchart that depicts a basic series of operation performed by the controller256. The flowchart includes all the operations (steps) depicted inFIG. 14, but also includes step S12where the controller256determines whether or not the array of proximity switches144fhas provided an input. If the array of proximity switches144fhas provided the input in step S11, then operations proceed to step S13where a determination is made by the controller256. If the electroluminescent element40″ is off, it is turned on by the controller256in step S14. If the electroluminescent element40″ is on, operations proceed to step S16where the electroluminescent element40″ is turned off by the controller256.

Returning to step S12, if the input was from one of the proximity switches144athrough144e, the controller256moves to step S16, which was described above with respect toFIGS. 13 and 14. Steps S16through S22in the fourth embodiment are generally the same as in the second and third embodiments. Therefore to avoid repetition, description of steps S16through S22is omitted.

The light panel30(FIG. 2) and the light panel32on the door handle assembly on the exterior of the car, as shown inFIG. 1, can also include a proximity switch panel configuration in accordance with any of the above described embodiments. The light panels30and32can include one or more proximity switches, and/or an array of proximity switches and an electroluminescent element. Specifically, the light panels30and32can illuminate when touched, as in the first embodiment. The light panels30can include the configurations in any of the second, third or fourth embodiments, but include a controller that operate a radio, air conditioning and/or other accessories of the vehicle10.

The light panel32can illuminate in response to a remote control key fog being activated to unlock the doors of the vehicle10. The light panel32can also illuminate and include a series of proximity switches with indicia that are connected to a controller that response to a sequence of switch inputs to unlock the door.

It should be understood from the drawings and the description herein, that any of a variety of light panels or switch light panels can be constructed and programmed for a use in a vehicle10to control any device installed within the vehicle10and be made to blend in with the interior of the passenger compartment11.

Each of the various embodiments of the present invention can be manufactured in a variety of manners. However, a preferred method of manufacture includes the following basic steps.

A plastic film that is transparent, translucent or semi-translucent is provided with graphics (indicia) on one side thereof. The graphics are printed or otherwise formed on the plastic film to form the outer layer(s)36or36′. It should be appreciated that the outer layer(s)36and36′ can further alternatively be covered or coated by another protective layer that is exposed to the passenger compartment11.

Next, the first and second electrically conductive switch portions50and52(50athrough50eand52athrough52e) are printed on to the underside of the plastic film (outer layer(s)36and36′). The first and second electrically conductive switch portions50and52can be formed simultaneously or separately and an insulating coating applied to which ever of the two portions is applied first to ensure that the first and second electrically conductive switch portions50and52are electrically separated or insulated and spaced apart from one another. Alternatively, a single conductive layer can be formed on the plastic film, then portions etched away to form the first and second electrically conductive switch portions50and52.

Next, the phosphor material, followed by the dielectric material is applied to form the phosphor and dielectric material layer72. Thereafter, a conductive layer74is applied or printed onto the phosphor and dielectric materials72. This layered film is then shaped to the desired three dimensional contour (switch protrusions and/or trim contoured shapes).

Last, with the layered film in the desired shape, a plastic substrate is then injection molded onto the backside of the layered film thereby forming the base portion42(and42′). The base portion42(and42′) is formed with apertures that allow electric leads or wires to be connected with respective proximity switch(es) and the electroluminescent element.

The controller (56,156or256) is then connected to the electric leads or wires. The controller includes circuitry and/or micro devices that permit programming and/or wiring to perform the above described operational steps in response to inputs from the various proximity switches. The controller also includes an inverter device that converts DC power from the battery65to AC current to illuminate the electroluminescent element and activate the proximity switch(es).

When power is supplied to the electroluminescent element, the light emitting materials glow through the translucent areas on the plastic film (the outer layer36or36′) highlighting the dark colored, opaque graphics or indicia. When the electroluminescent element is turned off, the light panel or switch light panel appears like a normal interior component. Specifically, the outer layer36or36′ can be coated or colored to match surrounding interior components and blend in unnoticed until illuminated.

The outer layer36(36′) can be made from any of a variety of materials, for instance polycarbonate or a polycarbonate blend. The proximity switches and the conductive layer74can be made of any of a variety of translucent materials, for example, Bayer Baytron®.

The base portion42can be made of any of a variety of plastic materials, for example, polycarbonate or polycarbonate/ABS blend such as Bayer Bayblend® or Makrolon®.

The controllers56,156and256can also include a microcomputer with a control program that controls the various remote devices and accessories of the vehicle10, as discussed above. The controllers56,156and256can also include other conventional components such as an input interface circuit, an output interface circuit, and storage devices such as a ROM (Read Only Memory) device and a RAM (Random Access Memory) device. It will be apparent to those skilled in the art from this disclosure that the precise structure and algorithms for controllers56,156and256can be any combination of hardware and software that will carry out the functions of the present invention.

The various components and portions of the vehicle10are conventional components that are well known in the art. Since such components are well known in the art, these structures will not be discussed or illustrated in detail herein. Rather, it will be apparent to those skilled in the art from this disclosure that the components can be any type of structure and/or programming that can be used to carry out the present invention.