Abstract:
An improved, battery-operated liquid-crystal display (LCD) device designed to use the battery as a structural support for the LCD. The device, typically a cellular phone, media phone, or other telecommunications mobile station, includes a housing that encloses station components. The housing forms a window through which the LCD screen may be viewed when the device is in operation. A recess behind the LCD is formed for receiving a battery. The battery is made of a material that is sufficiently resistant to bending that, when the device, including the battery, is assembled, the battery structurally engages the LCD. That is, the battery provides at least some structural support to the LCD so as to reduce or eliminate deformation of the LCD that would otherwise have occurred due to a stress applied to the device.

Description:
[0001]    The present invention relates generally to the field of wireless mobile stations, and more specifically to an improved design for a mobile station that reduces the likelihood of mishandling-related damage to the liquid-crystal display (LCD).  
         BACKGROUND OF THE INVENTION  
         [0002]    Telephone were, for many years, not mobile at all. Instead, they were connected by a series of wires and cables to the local exchange (sometimes referred to as a switching office), and from there to the rest of the network itself. In this configuration, one or more lines were connected to a subscriber&#39;s residence or business location, usually entering the building and connecting just inside at a terminal block, that is, a central location where connections could be made to the telephone devices located within the building itself. The actual telephone, that is, the instrument by which the subscriber sent and received communications, was connected to the terminal block by a wire running through the building. The telephone itself typically featured a relatively large housing in which the electrical components necessary for engaging in telephone communications were enclosed. A microphone was provided for picking up the subscriber&#39;s voice and converting it into electrical signals for transmission, and was frequently enclosed in its own housing. The microphone housing formed an open-ended cavity into which the subscriber could speak, with the microphone being located at the end of the cavity opposite the open end. The microphone housing was either attached to the main telephone housing or held as a separate unit by the subscriber, but in either case, the microphone itself was connected to the telephone circuitry enclosed in the telephone housing via a cable or wire (the terms herein being used synonymously unless otherwise specified). The subscriber would hear the conversation on a speaker, also enclosed in its own housing, which was, in turn, generally connected by a cord of some length to the telephone housing itself.  
           [0003]    In later model telephones, a personal telephone handset was often employed. The handset featured a microphone and a speaker in one housing, suitably mounted in a spaced-apart relationship so that the speaker could be held to the ear while the microphone was positioned near the mouth. The handset housing comprised an elongated member that provided seats for mounting the microphone and speaker, and also included a handle portion for the subscriber to hold onto while using the handset. The handset was connected to the main telephone body by a cord containing wires for carrying signals (and power, which ultimately was supplied from a source at the local exchange) to and from the speaker and microphone. In use, the body of the telephone was often mounted to a wall or connected to a wall receptacle by a short cord, while the handset might be connected to the main telephone body by a somewhat longer cord. The length of the handset cord defined the limit of the user&#39;s “mobility”. The telephone housing or main body included a switch hook on which the handset rested when not in use. The weight of the handset moved the switch to open the circuit. The switch was spring-loaded to return to a position closing the circuit when the handset was lifted by a subscriber wishing to make a phone call. Closing the circuit connected the telephone to the local exchange, and signaled to the telephone company that the subscriber was ready to make a telephone call.  
           [0004]    Eventually, a sort of greater mobility was achieved as homes and businesses came to have more than one or even many telephones, any one of which could be used to connect the subscriber to the local office from different locations. To avoid the need to purchase too many appliances, wall-mounted receptacles were designed that could receive quick-connect jacks attached to a phone cord. This meant that a single instrument could be moved to any location where such a receptacle was located and simply plugged in for operation. Mobility was still limited, however, to the location currently in use, and of course, installing receptacles too far from the terminal block was impracticable.  
           [0005]    The mobility of phones changed dramatically with the advent of wireless networks. In a wireless network, the mobile telephone handset allows the subscriber to move throughout the network-coverage area. This mobility is possible by an array of geographically-distributed base-station systems (BSSs) that communicate with nearby mobile phones using wireless radio frequency (RF) communication. The BSSs relay signals received from the mobile telephones to the rest of the network. The network, in this case, is usually referred to as a public land mobile network (PLMN) although it may connect through gateways with the public switched telephone network (PSTN) or other communications networks such as the Internet. Ideally, a mobile telephone is, while in the network-coverage area, within communication range of two or more BSSs, but actively communicating with only one. When the mobile phone moves from one place to another, the active communication link switches from one BSS to another in a process referred to as “handoff”. As a result, the subscriber may place a telephone call from almost any location provided it is within range of a BSS, and not too close to any obstacle or device that might interfere with radio communications.  
           [0006]    In addition to mobile telephones, other devices have been developed that are also able to utilize the wireless (radio) telecommunications network. For example, a wireless paging device may be suited for receiving a signal including a telephone number to call or a short message, the pager enunciating or otherwise alerting the subscriber when such a transmission has been received. More recently, two-way pagers have been developed as well, allowing the subscriber to send replies or return messages. Wireless personal digital assistants (PDAs) have also evolved so as to be able to communicate effectively through a wireless network. A PDA is, in general, an electronic device that acts as a personal organizer, typically storing an address book, appointment calendar, and other similar information. A PDA that is connected to a wireless network is able to exchange this information with, for example, a central server or other device to either provide a backup or to coordinate information between multiple subscribers. Electronic devices for communicating with an Internet service provider (ISP) in order to connect with the Internet to, for example, send email or search the World Wide Web (“Web”). Often called “Web-phones”, “Web-enabled phones”, or simply “media phones”, these devices are, as their name implies, typically integrated with a wireless telephone, but can be used for Internet access as well. In addition, there are other wireless devices that combine the functions described above or, alternately, perform only certain selected functions. For convenience, all of these (and similar) devices will be herein referred to as “mobile stations”.  
           [0007]    Mobile stations were originally themselves quite bulky devices. At the time they became popular, communications technology had evolved to the point where the telephone circuitry was not so space-consuming that it could be entirely enclosed in a handset-like device. They received no electrical power from a central telephone company source, however, and therefore either had to be connected to either an electrical outlet (via an adaptor) or a battery. The batteries, especially, were large and bulky. Mobile stations in automobiles, of course, could simply use the automobile&#39;s electrical system for power, but truly mobile phones, those carried from place to place by subscribers, often required a separate carrying-case containing a rather large battery. Eventually, however, the batteries themselves also became small enough to be conveniently integrated into the design of the telephone handset and the whole mobile station could be carried around as a single unit. In modern mobile stations, the battery often attaches to the device itself at a location where no controls are otherwise located (see for example FIG. 1). Contacts on the battery exterior engage contacts on the housing of the mobile station and the battery is fixed into position in some way. The telephone housing frequently has a recess into which the battery can be fitted and a means by which it can be secured. The assembled unit appears as a single handset unit upon casual inspection.  
           [0008]    In addition to a speaker and microphone, mobile stations will generally include a keypad, one either fashioned as an ordinary telephone keypad, or, alternately, based on a modified computer-keyboard design. The keyboard allows the subscriber to input information such as the number to be called or the text of a message to be transmitted. Some form of visual display is often present, as well, providing a user interface upon which the user can view the input keyboard sequences or the text of a received message. Displays are especially useful in mobile phones for a couple of reasons. First, a “mobile” subscriber is often otherwise occupied driving for example, or crossing the street. Not being able to devote full attention to dialing in the normal fashion, having the number displayed allows the dialer to confirm that the correct number has been entered. Displaying the number or identity of an incoming caller is also desirable, especially when billing is based on airtime. When the called party realizes that an incoming call may be unnecessary, it is simply not answered and the associated charges are avoided. The display may also indicate system, signal, and call status, useful information in the mobile environment. And with web-enabled media phones, all manner of graphics are available for display. The display screen is an indispensable feature of a modern mobile station.  
           [0009]    Frequently, the display used in mobile stations is a liquid crystal display (LCD). LCDs are frequently used because of their versatile capabilities and relatively low power consumption. In general, LCDs are composed of a liquid-crystal layer sandwiched between transparent, light-polarizing materials along with electrical conductors and electrodes that enable a bias voltage to be applied across a specific small area (that is, a pixel) of the liquid-crystal layer. Applying the voltage difference to the pixel electrode alters the light-polarizing characteristics of the liquid crystal material proximate to the electrode. Light waves that are polarized when passing through one polarizing layer will typically not pass through the other, cross-polarized layer, unless the phase angle of the polarized light is changed as it passes through the liquid-crystal layer between them. Liquid crystals are substances that flow like liquids, but whose molecules nevertheless maintain a definite orientation with respect to each other. This orientation may be changed from one that causes the needed phase-angle change to one that does not through the application of an electrical charge, as described above. The liquid-crystal orientation, therefore, determines whether the pixel will appear light or dark. Color LCDs include color-filtering subpixels in each pixel so that the wavelength of the passing light can be controlled and color images produced. An LCD for media phone use may have hundreds of such pixels, and very satisfactory images can be displayed upon it.  
           [0010]    Unfortunately, the LCD is also a somewhat fragile device. Although frequently protected by a sturdy plastic cover over its outer face, to avoid being punctured, it is also subject to damage that is caused by being twisted or deformed. This twisting or other deformation may be induced when the mobile station undergoes unintended strain. For example, the subscriber may store the mobile station in a briefcase which may then be stuffed with a number of books or other heavy objects, causing the mobile station to undergo a small, but detrimental, amount of deformation. Mobile stations stored in the pockets of jackets or purses may experience similar problems when the jacket or purse is thrown into the back seat of a car or something is set on top of it. Even dropping the mobile station may result in temporary deformation upon impact. Whatever the cause, however, in a great many cases, the mobile station&#39;s sturdy plastic housing will be resilient enough to undergo only elastic deformation, and often exhibit no physical signs of damage. Some of the stress and resulting deformation, however, may be transferred to the LCD with a less favorable outcome. The various components of the LCD, described above, often lack the strength and resiliency of the rest of the components of the mobile station. Even a slight deformation of the LCD may result in local cracking of the various layers or even local separation. If this happens the entire LCD may be rendered totally inoperative, or there may be certain areas on it where activation of the liquid crystal is no longer possible. This may result in permanently light or dark spots in undesirable locations.  
           [0011]    To guard against such damage, the LCD is placed within a metal chassis. The chassis preferably has the strength and resistance to deformation necessary to avoid mishandling damage occurring to the LCD, or the chassis may simply absorb the deformation itself, being constructed so as to allow the LCD to remain undeformed even when the chassis is not in its original shape. Although fairly effective at preventing mishandling damage to the LCD, however, the metal chassis nevertheless represents somewhat of a retreat in mobile station design because of the mass and bulk it adds to the mobile station. There is simply no way to construct a chassis having the favorable characteristics described above without having it, at the same time, take up an inordinately large amount of space and contributing unduly to the weight of the mobile station.  
           [0012]    Needed, therefore, is a way to reduce or prevent mishandling damage to the LCD of a mobile station without adding undue weight or size to the instrument. The present invention provides just such a solution.  
         SUMMARY OF THE INVENTION  
         [0013]    To overcome the deficiencies in the prior art described above, the present invention provides an improved design for mobile phone handsets. The instrument of the present invention preferably includes a first housing portion and a second housing portion, although in some embodiments there may be less or more than two. The first housing portion and second housing portion, when assembled, enclose transceiver circuitry sufficient for phone operation, and a liquid-crystal display (LCD) for providing a visual user interface. The assembled housing further enclosed a battery element for providing electrical power for use by telephone components, the battery element being made of a substantially stiff material and, when the first housing portion and the second housing portion are assembled in an operating configuration, is disposed in a fixed position with respect to the LCD such that it provides resistance to LCD deformation. The battery may be affixed to the first housing portion in such a way as to secure it and the LCD in position, or it may be held in place by affixing the second housing portion to the first housing portion. In another aspect, the invention is a battery-powered LCD device formed to receive a battery that structurally engages the LCD.  
           [0014]    A more complete appreciation of the present invention and the scope thereof can be obtained from the accompanying drawings that are briefly summarized below, the following detailed description of the presently-preferred embodiments of the present invention, and the appended claims.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    For a more complete understanding of the present invention, and the advantages thereof, reference is made to the following drawings in the detailed description below:  
         [0016]    [0016]FIG. 1A is an illustration depicting a conventional mobile telephone of the prior art as viewed from the front;  
         [0017]    [0017]FIG. 1B is an illustration depicting the mobile telephone shown in FIG. 1 as it appears when viewed from the side;  
         [0018]    [0018]FIG. 2 is a partially cutaway side view of the telephone illustrated in FIGS. 1A and 1B, taken along line A-A of FIG. 1A;  
         [0019]    [0019]FIG. 3 is an illustration depicting a typical media phone of the prior art;  
         [0020]    [0020]FIG. 4 is a perspective view (exploded) illustrating a mobile station according to an embodiment of the present invention;  
         [0021]    [0021]FIG. 5 is a perspective view (exploded) of a mobile station, illustrated in accordance with another embodiment of the present invention;  
         [0022]    [0022]FIG. 6 is a perspective view (exploded) of a mobile station  600  illustrated in accordance with yet another embodiment of the present invention; and  
         [0023]    [0023]FIG. 7 is a perspective view of mobile station  700  (exploded) constructed according to yet another embodiment of the present invention.  
     
    
     DETAILED DESCRIPTION  
       [0024]    [0024]FIGS. 1A, 1B, and  2  through  7 , discussed below, and the various embodiments used to describe the present invention are by way of illustration only, and should not be construed to limit the scope of the invention. Those skilled in the art will understand the principles of the present invention may be implemented in any suitable LCD device, in addition to the devices specifically discussed herein.  
         [0025]    [0025]FIG. 1A is an illustration depicting a conventional mobile telephone  100  of the prior art as viewed from the front. Mobile telephone  100  includes housing  101  having a face  106  that is the side or portion of the telephone on which most user-accessible controls are located. For example, telephone  100  includes a numeric keypad  112 , and on/off button  108 , and auxiliary control buttons  113 . Face  106  of housing  101  includes a window  104  through which LCD  105  is visible when the telephone  100  is assembled. LCD  105  provides the visual user interface of telephone  100 , as described in more detail above. In the embodiment of FIG. 1, LCD  105  may display a variety of information including called telephone number  109 , battery status indicator  107 , signal strength indicator  111 , and message waiting indicator  117 . Auxiliary buttons  113  are frequently multi-function buttons, with the current function of each of the buttons being displayed upon LCD  105  in the area generally designated by reference number  119 . The function of each of the auxiliary buttons  113  frequently changes with the specific operation being performed by the subscriber, and so it is extremely convenient to have the functions displayed. Telephone  100  also quite naturally includes a microphone port  116  and speaker ports  118 . Note that both microphone  116  and speaker  118  are actually internal components, but receive and project sound through the associated speaker ports formed in housing  101 . An antenna  110  is used to assist in the transmission and reception of radio signals.  
         [0026]    [0026]FIG. 1B is an illustration depicting the mobile telephone  100  shown in FIG. 1 as it appears when viewed from the side. Keypad  112 , auxiliary buttons  113  and on/off buttons  108  are in this view visible, as is antenna  110 . From this perspective, it can also be seen that housing  101  comprises front housing portion  102 , and back housing portion  114 . Typically, the two separate housing portions of telephone  100  are joined together to enclose the various telephone components. While the basic housing  101 , that is, the enclosure for the telephone circuitry, may include more than two separable portions, it is preferable to have only two. These housing portions joined at parting line  121 , are held together by a fastening means (not shown) when the phone is assembled. Back housing portion  114  forms a recess  115  for receiving an appropriately-shaped battery  120 . As described above, battery  120  includes positive and negative contacts that engage corresponding contacts on the surface of back housing portion  104  (the contacts not being shown in FIG. 1B). The battery is removably attached to back housing portion  104  so that it may be installed and removed conveniently.  
         [0027]    [0027]FIG. 2 is a partially cutaway side view of the telephone  100  illustrated in FIGS. 1A and 1B, taken along line A-A of FIG. 1A. Keys  112  protruding through face  106  of front housing  102 , parting  121 , and battery  120  fitted into recess  115  of back housing  114  are shown for reference. Also shown in this view is speaker element  210  situated behind speaker port  118 . Printed circuit board (PCB), on which much of the telephone  100  circuitry and electronic components (not shown) are mounted, is held in place by supports  207  and  209 , extending inwardly from front housing  102  and back housing  115 , respectively. LCD  105 , visible through window  104  in front housing  102 , is disposed behind protective cover  103 . As can be seen in FIG. 2, LCD  105 , except for its visible face, is completely disposed securely within chassis  201 . Chassis  201  is, in turn, preferably secured to PCB  205 . As mentioned previously, chassis  201  is preferably constructed of a sturdy metal alloy and of sufficient dimension so as to prevent bending or twisting deformation of LCD  105 , even when under stress. To meet these criteria, however, chassis  201  takes up a relatively large amount of space and adds to the weight of the mobile station. Eliminating the need for chassis  201  by modifying the design of telephone  100  is the gist of the present invention.  
         [0028]    Although the telephone  101  depicted in FIGS. 1A, 1B, and  2  above are currently in widespread use, alternative types of mobile stations are also becoming popular. Some of these, such as media phone  300  described below, have a much larger LCD screen than telephone  101  and thus will derive an even greater benefit from the novel design of the present invention.  
         [0029]    [0029]FIG. 3 is an illustration depicting a typical media phone  300  of the prior art. Media phone  300 , like its precursor the cellular telephone, features a keypad  312 . Keypad  312 , however, contains a great many more keys for ease in entering alpha-numeric input, which given the shape and layout of media phone  300 , is often performed by the user with their thumbs. Thumbwheel  313  can be used for scrolling through information that is being displayed. As can be seen in FIG. 3, the LCD  305  of the media phone  300  is relatively much larger than the one used in a conventional telephone, such as telephone  100  shown in FIG. 1. As a result, the LCD is able to display not only a greater quantity of text than could previously be viewed, but also a wider variety of graphical images and other visual information. As media phone  300  is intended for use in retrieving and displaying Web pages and the like, this additional display space is practically a necessity. Media phone  300  also includes on/off button  308  and antenna  310 . Microphone port  316  and speaker ports  318  are spatially separated such that the media phone  300  may also be used as a standard telephone for conversation. Media phone  300  includes housing  301  to which are attached hinges  350  and  355  allowing cover  360  to be moved from a closed position (not shown) where it protects the LCD  305  and keypad  312 , to an open position where it typically remains while the media phone is in use. Note that when the media phone  300  is used for a standard telephone conversation, the protective cover  360  can be closed protectively while still leaving exposed microphone port  316  and speaker ports  318 . In an alternate embodiment, the protective cover protects only the LCD  305  and leaves keypad  312  exposed for use during the telephone call. Naturally, media phone  300  is also powered by a battery (not shown), which typically attaches in a manner similar to that used for attaching the battery  120  to telephone  100  (as shown in FIG. 2. As with telephone  100 , the visible face of LCD  305  of media phone  300  is protected by a clear plastic cover  303 . The remainder of LCD  305  is securely disposed within a substantial chassis (not shown in FIG. 3) to protect it from bending and twisting deformation.  
         [0030]    [0030]FIG. 4 is a perspective view (exploded) illustrating a mobile station  400  according to an embodiment of the present invention. Note that the device illustrated in FIG. 4 is drawn generically and is referred to as a mobile station because the improved design of the present invention may be adapted for use with each of the more familiar looking devices of FIGS.  1 - 3  and with numerous other devices, as well. Mobile station  400  includes front housing  410  and back housing  420 , which when assembled enclose all the internal components of mobile station  400 . Note that for clarity, many of the internal components of mobile station  400  have been omitted in FIG. 4, except as necessary to show the relationship of certain components in accordance with the present invention. Shown in FIG. 4, however, is LCD  450  in place such that it is visible through the LCD window (not shown) of front housing  410 . Disposed immediately behind LCD  450  are restraining devices  417  and  419 . Restraining devices  417  and  419  act to hold LCD  450  in place even in the unassembled condition suggested in FIG. 4. Although shown as largely rectangular in shape and substantial in size, there is no requirement for their size and shape beyond their ability to perform this function. And, although in this embodiment there are two such restraining devices, depending on the design of mobile station  400 , there may be only one or more than two.  
         [0031]    Preferably, restraining devices  417  and  419  are configured to remain stationary within front housing  410  even when the mobile station  400  is disassembled. This may be accomplished in a number of different ways. For example, in the illustrated embodiment, restraining devices  417  and  419  extend laterally across the interior of front housing portion  410  from sidewall  438  to sidewall  439 . Restraining devices  417  and  419  are simply pressed into place, with the pressure of the sidewalls then preventing their easy movement. Optionally, one or more tabs (not shown) could extend inwardly from sidewall  438  (and likewise sidewall  439 ) at the expected location of restraining devices  417  and  419  in order to ensure that they do not slip out inadvertently. In another embodiment, a fastener is used such as a threaded fastener that is, for example, entered through an opening in sidewall  439  and threaded into restraining device  417  in a threaded opening placed proximate to the opening in sidewall  439 . Other methods may be used as well. In general, restraining devices  417  and  419 , as well as the apparatus used to hold them in place, will be designed to minimize the amount of extra space required and the weight burden that they add to the device itself. In another embodiment (not shown), restraining devices  417  and  419  are simply small, flexible or spring-loaded rods or similar devices that can be inserted into place in impressions formed in appropriate locations on the interior wall of sidewall  438  and sidewall  439 . They may also be ribbons or cords. Returning to the embodiment of FIG. 4, restraining devices  417  and  419  also act along with sidewalls  438  and  439  to form a cavity  429  into which battery  430  may be inserted. Battery  430  includes a pair of electrical contacts, one of which, contact  431 , is visible in the view of FIG. 4. Electrical contact  431  and its counterpart on the opposite side of battery  430  engage the corresponding electrical contacts located on the interior of sidewall members  438  and  439  of housing  410  when the battery is placed in cavity  429 . (Again, in this view, only one contact, contact  434 , is visible.) Note that in the illustrated embodiment, restraining devices  417  and  419  will also help to hold battery  430  in place when the mobile station  400  is assembled, a feature that is preferable, but not required.  
         [0032]    Battery  430  is, for example, a nickel cadmium (NiCa) battery, but is enclosed in a stiff outer shell in order to structurally engage LCD  450  in accordance with an embodiment of the present invention. Materials of this type suitable for housing battery  430  are well known in the relevant art. As used herein, the term “structurally engage” connotes a relationship whereby a component, in this case LCD  450 , is not only held substantially fixed in one location, but also supported along a substantial extent of its surface area. Note that in addition to being composed of a relatively stiff material, battery  430  is of a size and shape to substantially engage much but not necessarily all of the back side of LCD  450 . The structural engagement of LCD  450  by battery  430  helps to prevent, and preferably eliminate, bending and twisting deformation. Note that for this effect to occur, LCD  450  and battery  430  do not have to be co-terminus on their adjacent sides, nor do they have to be the same size or shape. In addition, they do not have to be in direct contact. In other words, it is generally preferred, though not required, that battery  430  actually come into contact with LCD  450  when the mobile station  400  is assembled, so long as any intervening materials do not substantially detract from the structural support offered to the LCD  450  by the relatively stiff battery  430 . For example, in a preferred embodiment, the outer surface of battery  430  is compatible with contacting directly the rear side of LCD  450 . In an alternate embodiment, however, there may be a need to provide a non-conductive or non-abrasive intermediate layer (not shown) between the two components. This intermediate layer (or layers) does not detract from the “structural engagement” relationship between battery  430  and LCD  450  so long as they are properly constructed and fitted. If, on the other hand, an intermediary layer between the two components was simply a relatively fixed sponge-like material, battery  430  would provide little structural support to LCD  450 . In accordance with describing and claiming the present invention, therefore, structurally engaging will be construed as meaning that a stiffening element (such as battery  430 ) provides significant (that is, non-negligible) resistance to deformation of the LCD  450 .  
         [0033]    Returning to the embodiment of FIG. 4, once battery  430  has been placed in cavity  429 , back housing  420  can be installed. In the illustrated embodiment, tab  421  is inserted into slot  411  and then the four tabs on the exterior of back housing  420  are press-fit into corresponding indentations on the interior of the sidewalls  438  and  439  of front housing member  410  (in the illustrated embodiments, indentations  412  and  414  are shown). “Press-fit” simply indicates that the tabs are forced into the indentations, or are forced out during the removal process by slightly flexing back housing member  420 . Once in place, back member  420  holds battery  430  in place against LCD  450 . Note that the method for attaching back housing  420  is for purposes of illustration only, and other means are possible. For example, in an alternate embodiment (not shown), back housing  420  includes tab  421  for insertion into slot  411  formed in top side  440  of housing  410 , but the side tabs  422 - 425  on back housing  420  are not present. Instead, sidewalls  438  and  439  of front housing  410  each form a groove on their interior wall extending substantially the length of the wall and terminating at the interior side of top side  440 . When assembled, battery  430  is placed in cavity  429  as before, but back housing  420  is then installed by sliding it through the grooves in sidewalls until tab  421  has entered slot  411 . In this alternate embodiment, a retaining member may also be added to prevent back housing  420  from inadvertently sliding out of its closed position. This alternate embodiment is advantageous because back housing member  420  can be made of a substantially stiffer material because it need not flex during installation. This provides additional support for battery  430 , holding it in place and increasing its structural-support capability with respect to LCD  450 .  
         [0034]    [0034]FIG. 5 is a perspective view (exploded) of a mobile station  500 , illustrated in accordance with another embodiment of the present invention. The mobile station  500  of FIG. 5 is in many respects similar to mobile station  400  (shown in FIG. 4) and analogous components are similarly numbered. In the embodiment of FIG. 5, LCD  550  forms openings  551  and  552  through which fastener-receiving cylinders  556  and  557  protrude. (In this view, a portion of fastener-receiving cylinders  558  and  559  are also visible.) Fastener-receiving cylinders  556 - 559  are preferably securely fixed to, or integrally formed with, front housing  510 . In an alternate embodiment (not shown), the fastener-receiving cylinders protrude from front housing  510 , but do not pass through LCD  550 . Battery  530  forms fastener openings  531 ,  532 ,  533 , and  534 , for receiving fasteners  561 ,  562 ,  563  and  564 , respectively. Note that in FIG. 5, the battery is said to be “fastenable” to front housing  510 , a term that encompasses being fastened indirectly as well as directly, and by any type of suitable fastening device. When battery  530  is positioned, it is secured in place with the fasteners to prevent movement and contribute to battery  530 &#39;s ability to structurally engage LCD  550 . Although no mechanism is shown in FIG. 5 for attaching back housing  520  to front housing  510  during telephone assembly, any suitable method may be used. One distinction between the embodiment of FIG. 5 and the above-described embodiment of FIG. 4 is then the fact that back housing member  520  makes little or no contribution to holding battery  530  in place once the phone is assembled. This may provide for design flexibility, which in many cases may be desirable.  
         [0035]    [0035]FIG. 6 is a perspective view (exploded) of a mobile station  600  illustrated in accordance with yet another embodiment of the present invention. In this embodiment, battery  630  is integrally formed to function not only as the battery, but as a back cover for the housing of a mobile station. Being made of very stiff material, battery  600  substantially structurally engages LCD  650  to provide structural support in accordance with the present invention. In the embodiment of FIG. 6, battery  600  forms openings  690 ,  691 ,  692 , and  693  through which, when battery  600  is fitted onto housing  610 , fasteners  661 ,  662 ,  663 , and  664  are passed in order to threadedly engage comer supports  695 ,  696 ,  697  and  698 , respectively.  
         [0036]    [0036]FIG. 7 is a perspective view of mobile station  700  (exploded) constructed according to yet another embodiment of the present invention. LCD  750  is shown in place in front housing  710 . The remaining internal components of mobile station  700  have been omitted for clarity. When assembled, back housing  720  is fitted onto front housing  710  such that fastener openings  790 ,  791 ,  792 , and  793  are axially aligned with threaded openings of comer members  795 ,  796 ,  797  and  798 , respectively, so that threaded fasteners  761 ,  762 ,  763 , and  764  may be used to secure back housing  720  to front housing  710 . Back housing  720  forms a window  770  that is large enough for a battery (not shown) to pass through into position in front housing  710 . Door  774  is then secured to back housing  720  by positioning tabs  781  and  782  of door  774  in corresponding recesses  783  and  784 , then pivoting door  774  until it engages back housing  720 . when closed, tabs  772  and  773  on door  774  are received into recesses in back housing  720  (recess  775 , which receives tab  773 , is visible in FIG. 7) such that their respective fastener openings align. Door  774  is then secured into position with door fasteners  765  and  766 . Once door  774  is secured in place, of course, the battery is held properly in position, structurally engaging LCD  750 .  
         [0037]    The preferred descriptions are of preferred examples for implementing the invention, and the scope of the invention should not necessarily be limited by this description. The scope of the present invention is defined by the following claims.