SYSTEMS, METHODS, AND DEVICES FOR DISPLAYING INFORMATION

Abstract: A signage management system directs and modifies information that is displayed in the business environment. The signage management system includes a signage unit to display information, a local input device, and a local server coupled to the signage unit and local input device. The local server processes data input from the local input device and modifies the display on the signage unit, based on the data. Examples of suitable signage units include an image projection system and a projection screen, as well as at least one lightweight mirror, trapezoidal mirrors, an air flow system or any combination of these features.

Description: SYSTEMS . METHODS . AND DEVICES FOR DISPLAYING INFORMATION Field of the Invention The present invention relates to a signage unit suitable for display of information in retail sales environments such as fast food restaurants. In addition, the invention relates to an information management system utilizing such signage units. Background of the Invention Displays such as billboards, posters, backlighted signs, and other media that are publicly viewable from significant distances play an important role in the retail industry, both as advertising media and in support of purchase decisions. Operators of many types of retail businesses have found that the visual impact of self-luminous media, such as backlighted signs containing graphics and written information, are particularly useful at the point-of-sale, for example, as menu displays in fast food restaurants. Moreover, retailers in some businesses, for example, fast food restaurants, have found that the usefulness of point-of-sale product information displays is strongly affected by the visual quality of the display, and that despite the expense involved, purchase of backlighted graphics of high quality in large formats is an effective expenditure of resources for these businesses. A significant constraint on the usefulness of backlighted signs in the retail environment is the time required to change them in response to changing prices, inventory, sales, and other circumstances. This limitation becomes critical for businesses which utilize electronic management information systems, since an important aspect of such systems is the speed at which they are able to produce new information in response to changing conditions. Summary of the Invention Generally, the present invention relates to systems, methods, and devices for displaying information. One embodiment is a system for displaying information in a retail food establishment. The system includes a signage unit to display information, a local input device, and a local server coupled to the signage unit and local input device. Information input at the local input device can include, for example, inventory data and sales data. The local server modifies the information that is displayed on the signage unit based on the input of data at the local input device. Another embodiment is a method for managing information. At least one signage unit and at least one local input device are coupled to a local server. Data is input into the at least one local input device. Based on the input data, the information displayed on at least one of the information signage units is modified. The data used to modify the information display unit can include, for example, inventory data and sales data. Optionally, the information displayed on at least one of the information signage units is modified to direct the advertising of an item based on the inventory of the item. In some embodiments, the information displayed on at least one of the information signage units is modified to display information based on sales data. Another embodiment is a retail sales facility that includes a point-of-sale counter, a local input device, a signage unit, and a local server. The local input device is at the point- of-sale counter for input of data, such as inventory or sales data. The signage unit displays information viewable from the point-of-sale counter. The local server is coupled to the local input device and the signage unit to modify the information that is displayed on the signage unit based on the input of data at the local input device. A further embodiment is a computer software product to direct the processing of data and to modify signage unit information, based upon the processed data. The computer software product includes a readable medium. A first sequence of instructions and a second sequence of instructions are stored on the medium. A processor executes the first sequence of instructions, which causes the processor to process data such as, for example, inventory data and sales data. The processor executes a second sequence of instructions, which causes the processor to modify information displayed on at least one signage unit based upon the data. Yet another embodiment is a signage unit device to display information. The signage unit includes a housing, a projection screen, an image projection device, and a mirror system. The housing defines an internal volume and a viewing aperture. The projection screen is disposed over the viewing aperture. The image projection device produces an image, which the mirror system directs to the projection screen for viewing. In some embodiments, the mirror system includes at least one lightweight mirror. The at least one lightweight mirror includes a reflective film stretched over a lightweight frame. Optionally, the signage unit includes one or more trapezoidal mirrors disposed at a non-90° angle relative to an incoming image. In some embodiments, the signage unit includes an adjustment mechanism at least partially extending from the housing to adjust the position of at least one of the mirrors. In some embodiments, the signage unit includes an air flow system to regulate the flow of air into the internal volume of the housing. The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The Figures and the detailed description that follow more particularly exemplify these embodiments. Brief Description of the Drawings The invention can be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings, in which: Figure 1 is a schematic view of a retail food establishment including a signage unit; Figure 2 is a block diagram of a system for managing information at a retail food establishment, according to the invention; Figure 3 is a schematic cross-sectional view of one embodiment of a signage unit, according to the invention; Figure 4 is a schematic side view of one embodiment of a projection screen; Figure 5 is a schematic side view of another embodiment of a projection screen; Figure 6 is a schematic front view of one embodiment of a retail food establishment menu board with multiple signage units, according to the invention; Figure 7 is a schematic cross-sectional view of a second embodiment of a signage unit, according to the invention; Figure 8 is a schematic cross-sectional view of a third embodiment of a signage unit, according to the invention; Figure 9 is a schematic cross-sectional view of a fourth embodiment of a signage unit, according to the invention; and Figure 10 is a schematic cross-sectional view of one embodiment of a mirror suitable for use in the signage units, according to the invention. While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Detailed Description of the Preferred Embodiment The present invention is believed to be applicable to displays, systems, and methods in, for example, the retail business environment, and in particular the restaurant environment. The present invention is also directed to a signage management system that includes a signage unit to display information. While the present invention is not so limited, an appreciation of various aspects of the invention will be gained through a discussion of the examples provided below. The inventions are described with respect to a retail food establishment, such as a restaurant or fast food shop, however, it will be recognized that the inventions can be readily adapted for use in other retail establishments and other businesses. The signage unit can be used in any number of locations throughout the business (e.g., restaurant). The signage management system can locally control information displayed on the signage unit. Data can be entered from a local input device and can relate to prior sales, current sales, inventory, food availability, sale items, prices, and other relevant information to the retail business environment. Input data is typically managed through the signage management system. The signage management system includes the signage unit, at least one local input device, and a local server, working in conjunction with computer software or hardware, to determine what information to display on the signage unit. Such a signage management system can have one or more advantages over current systems. For example, the signage management system can offer a simple, cost effective, and practical management system for retail businesses. Another possible advantage is that the management system can allow any data input from the local input device to be managed in the local environment. Yet another possible advantage of the management system is that it displays information on the signage unit based upon processed data that is entered at the retail store. Also, another possible advantage of the signage management system is that some embodiments of the signage unit are relatively lightweight. Signage Management System Figure 1 schematically portrays one example of a fast food restaurant. The systems, methods, and devices described can be readily adapted to other restaurants, business configurations, and retail sales facilities. A customer 120 stands in front of a point-of-sale counter 160, which includes a local input device 150, and views available product choices, advertisements, menu prices, and other information displayed on a projection screen 180 of a signage unit 100. Once choices have been made, a sales person enters choices into the local input device 150 at the point-of-sale counter 160 and collects payment. Food orders generated by the purchase transaction are then typically displayed on a kitchen signage unit 170, which is visible by kitchen personnel working in a kitchen area 190. The kitchen signage unit 170 is optionally a signage unit similar to a signage unit 100 or can be another type of display. Prepared food is presented to the customer 120 at the point-of-sale counter 160. Alternatively, the customer can enter his own order on the local input device from the counter or from a drive-up window, while viewing a signage unit. One example of a suitable signage management system for a fast food restaurant is schematically portrayed in Figure 2. The signage management system includes a local server 20 which is linked to one or more local input devices 11, an optional signage manager 9, one or more signage units 10, one or more optional kitchen signage units 17, an optional inventory manager 24, an optional point-of-sale terminal 15, and, optionally a nonlocal server 22. Other configurations of the signage management system are also contemplated. The parts of the signage management system are coupled over data transmission links of types known in the art. The term "data transmission link" includes, but is not limited to, any suitable medium for transmitting data, such as coaxial cables, other types of conductive wire or cable, optical fibers, electromagnetic wave or other wireless communication, and the Internet or other networking system. Local Server Generally, the signage management system includes a local server 20. Optionally, the local server 20 is a computing device, such as, for example, a personal computer (PC), a minicomputer, a larger mainframe computer, or any other type of computer. The local server 20 contains a computer processor that processes data and directs the display on at least one signage unit 10. The local server 20 can direct the information displayed on any number of signage units 10 distributed throughout the restaurant. The local server 20 is coupled to at least one local input device 11. Data is entered on the local input device 11 and is transmitted to the local server 20. The data can consist of inventory data, sales data, price data, sale item data, advertising information, promotional information, employee information, or other business related data. The signage management system, through the local server 20, manages input data. The local server 20, can typically perform a variety of data organization and sequencing tasks, direct the signage unit 10 to show a particular display, evaluate input data, and direct other functions in the signage management system. The local server 20 can optionally generate new graphics or select a display from a database of graphics. For example, the local server 20 can optionally modify the signage unit 10 from a constant display of a large amount of graphics or tabular data on a single screen to a time sequence of screens, each screen showing less data but perhaps in a more readable form. In one embodiment, on one screen, menu items, such as hamburgers, could be shown with a sequential adding of condiments, such as pickles, cheese, onions, and tomatoes, as the customer orders, while side orders, such as fries and drinks, could be sequentially shown on an adjacent or the same screen. In this way, the information on the signage unit 10 helps the customer to communicate correct purchase choices. Display information can be provided to the local server 20 over data transmission lines, such as the Internet or a network, or from data storage media, such as optical or magnetic disks. Optionally, the local server 20 includes a database for storing display information. Typically, the signage manager 9, which can be its own separate unit or can be incorporated into the local server 20, is used to direct displays on the signage unit 10. For example, the signage manager 9 can include a database containing displays. The signage manager 9 can select particular displays based on data input at a local input device 11 or based on direction from a local server 20 or a non-local server 22 and transmit the selected display to the signage unit 10. The display manager 9 can include computer software or hardware to direct the display of information on the signage unit 10. The specific programming of the local server 20 and how it interacts with signage manager 9 can be determined, for example, by focus panel or other marketing studies, which are based upon how fast food customers actually make decisions. The signage manager 9 is shown schematically as a separate unit in Figure 2, some or all of its functions can be physically incorporated into the local server 20, or into the signage unit 10. Figure 2 portrays a single local server 20. The signage management system can include more than one local server, and different servers can perform different functions. Additionally, the local server 20 can be coupled, through suitable data transmission links, to a non-local server 22, if desired. In some instances, multiple local servers at different locations are coupled to a non-local server with each local server being located, for example, in a separate business establishment, and coupled through data transmission links to its own set of local input devices, product information displays, signage management systems, and kitchen signage units. The non-local server 22 can be located, for example, at a central office or another store location. The non-local server 22 can receive data from multiple sites and compile the data to supplement, replace or update the data at the local site. The local server 20 can be coupled to the non-local server 22, for example, over data transmission lines, such as the Internet or other data transmission links. For example, the central office can receive inventory data or sales data from the local server 20 or a number of local servers at several individual locations, and can process the data and send information to the local server 20. In one embodiment, the local server 20 processes customer purchase or sales data and modifies at least one signage unit 10 based on that data. Sales data includes, but is not limited to, current customer purchase information, prior customer purchase information, and a sales total for a purchase. Purchase information includes, but is not limited to, the items the customer ordered and cost to the customer. Optionally, the local server 20 analyzes the data and modifies a signage unit 10 based upon the analyzed data. For example, if prior customers are purchasing one item more than others, at least one signage unit 10 can be modified, through the local server 20, to further advertise that item or to advertise other items. In another embodiment, the local server 20 directs and modifies the signage unit 10 to show food items as they are ordered by a current customer so the customer knows that an employee input the proper order. Further, other customers in line could see the sequence of choices being made which could aid in their own decision making process. In some embodiments, the local server 20 processes inventory data to control the display of information on at least one signage unit 10. Optionally, the local server 20 includes an inventory manager 24, which can be its own separate unit or can be incorporated into the local server 20. The optional inventory manager 24 provides an inventory database, along with at least one local input device 11, for enabling a variety of data to be entered into the system concerning items in inventory. The local server 20 can modify at least one signage unit 10 based upon inventory data, if desired. At least one local input device 11 can be designated for inventory entry. For example, such local input devices can include a unit located in the kitchen area that allows employees to enter inventory information, or a point-of-sale terminal 15 for entering customer order data. Based on the entered data, the processor can reduce the overall inventory for an item as the item is sold. Inventory data includes, but is not limited to, receipt of delivered items, non-receipt of incoming items, a listing of orders placed with suppliers, an overall level of stock of an item, a stock of currently prepared food items, a stock of items in the kitchen area, a stock of items at the point-of-sale, and availability of a food item. For example, inventory manager 24 can provide a receiving function, where grocery items and quantities delivered to the restaurant are entered as they are received and can be checked against a database table of orders placed with suppliers. The inventory manager 24 can "also provide for input from kitchen personnel concerning items which are below a predetermined level in stock. The inventory manager 24 can also provide a display which shows levels of items in stock and warnings or other signals indicating when orders need to be placed for additional supplies. The local server 20 manages and processes the inventory data. The local server 20 uses the processed data to control the display of the signage unit 10. The local server 20 or the signage manager 9 determines from the processed data that a particular display be assembled or retrieved from a database for display on the signage unit 10. For example, a restaurant receives a shipment of food items. An employee inputs the data into a local input device 11 and the local server 20 processes the data. If an overstock or high inventory of the food item is input, the local server 20 could direct and modify the signage unit 10 based upon the data. For example, the local server 20 can modify a point-of-sale signage unit 10 so that an advertisement or pictorial representation is displayed that includes the overstocked food item. The displayed information can optionally include a special sale of the overstocked item. The display of the overstocked item on the point-of-sale signage unit 10 can influence a customer's purchase and reduce the inventory on the overstocked item. Alternatively, the overstocked item can appear brighter than the rest of the items on a menu list or as a pictorial representation on the signage unit to induce a customer to purchase the item. If an item becomes understocked or has a low inventory, the inventory data is processed and the display of the food item on the signage unit 10 can be modified to display appropriate information, for example, removing the item from a menu list or pictorial display or removing advertising for the item. The local server 20 can remove the item from the menu when the inventory of the item falls below a predetermined level. If a business runs out of an item that appears on the signage unit 10, the display of the item could be removed from the signage unit 10 or the information displayed could be modified to indicate that the item is no longer available. In other embodiments, the local server 20 processes both inventory data and sales data and uses the processed data to control displayed information. For example, as the customer orders items from the menu the inventory data can be adjusted to reflect the sale of the item, which allows inventory to be tracked as purchases are made. In other embodiments, the local server 20 processes only inventory data to control displayed information. In other embodiments, the local server 20 processes only sales data to control displayed information. The local server 20 can optionally have a data storage medium that stores inventory data or sales data. The local server 20 can, at end of a business day, or at any other time, process that information and then generate a sequence of information displays to be displayed on at least one signage unit 10 based upon the data. Alternatively, the daily processed data can be analyzed with prior data to direct the display of information. Local Input Device The signage management system includes at least one local input device 11. While Figure 2 shows the local input device 11 as multiple devices, optionally, a single local input device can be used. The multiple local input devices can be distributed throughout the restaurant in locations including, but not limited to, the point-of-sale, the kitchen area, in storerooms, in the business office, at the drive-thru, or at any other location suitable for data input. The local input devices can be used for the input of data related to prior sales, current sales, inventory, food availability, programming instructions, prices, sale items, and any other relevant information to the business. An employee or a customer typically inputs the data into the local input device 11. For example, an employee enters a customer order into a local input device 11 at a point-of-sale terminal 15. Alternatively, a customer interactive local input device 11 is provided to allow the customer to directly input information at, for example, a drive-thru. Information can be entered into the local input device 11 using input entry devices including, but not limited to, a keyboard, a touch screen, a bar code scanner, or a vocal input device. An individual local input device can have one or multiple devices for data entry. As an example, a local input device used for inventory entry can include a keyboard for entering data and a bar code scanner to read a bar code on a box delivered from a supplier to the business. The bar code could identify that the box contained a certain number of items, which becomes part of the inventory data when entered. As the item in the box is depleted, an employee could track the depletion by further scanning the bar code on the box. The local input device 11 is coupled to other components, such as the local server 20, through data transmission links. The term data transmission link includes, but is not limited to, any suitable medium for transmitting data, such as coaxial cable, other types of conductive wire or cable, optical fibers, electromagnetic wave or other wireless communication, and the Internet or other networking system. In some embodiments, the local input device 11 includes, for example, a CD ROM drive or data tape cartridge to allow an alternative mode of data input to the local server 20. This mode of data transmittal might be used, for example, to provide less frequent changes to the system. An example of such input might be the input of updated versions of system software or programming instructions. Optionally, the signage management system includes a non-local input device. In some embodiments, the non-local device is coupled to the signage management system between the local server 20 and the non-local server 22. The non-local input device can be located at any remote location to input data including, but not limited to, inventory data, sales data, or programming instructions. Alternatively, the non-local input device is a telephone. For example, a customer calls the business to place a food order and uses the telephone key pad or his voice to proceed through a recorded menu. After ordering, the local server 20 evaluates the data and directs a signage unit 10 to display the order information. Signage Unit One or more signage units can be distributed at the point-of-sale, in the kitchen, at a drive-up window, in storerooms, in a business office, on any number of displays located in the building, on the building or outside the building, or any other location for the display of information. For example, a signage unit 10 can be disposed in an overhead location above the point-of-sale. In some embodiments, multiple signage units 10 are arranged in an array which can, for example, be a horizontal row, vertical row, array, or matrix of signage units. As a result, signage units can be placed in close proximity to one another, as shown in Figure 6, thereby forming a compact array of signage units 602, 604, 606, and 608, which are optionally separated by borders 603, 605, and 607 and surrounded by a frame 610. The signage unit 10 can display information, including, but not limited to, menu items, prices, specials, moving displays, sequential displays, child or adult oriented information, commercials, inventory information, customer order information, employee or manager identification, and employee-of-the-month recognition. For example, the signage unit 10 at the point-of-sale can include menus, pictorial representations of items, sale information, specials, promotions, or any other information that the business desires. In some embodiments, the local server 20 directs and modifies the displays on the signage units based upon the data input from at least one local input device 11. Prices on the signage unit 10 can be modified to reflect an inventory overstock or understock of an item or customer preference for a menu item. The menu displayed on the signage unit 10 can be modified depending on the time of day to display, for example, a breakfast, lunch, or dinner menu or specials. The specials displayed on the signage unit 10 can be modified as desired. The display can be modified based upon, for example, inventory data, sales data, or kitchen data, or based upon any combination of input data, if desired. Customer orders from, for example, within the restaurant or at the drive-up window can modify the signage unit 10. A customer order through self-input of information can also modify the display on a signage unit 10. In one embodiment, the local server 20 directs the display to show current purchase information on at least one signage unit 10 as purchase choices are made, so the customer knows what choices have been made and that the restaurant employee has correctly input the order. This display can provide graphic portrayals of choices for those who are not able to read the language in which the restaurant operates. Such a graphical display can also be particularly useful for making purchases at a drive-up location, where background noise and other commumcation difficulties, along with the general remoteness of the location, can also make it difficult for the customer to ensure that the order is correctly understood. Graphical portrayals of items being ordered can also be useful for those suffering from hearing impairment. As an alternative to graphical portrayals, the ordered item can be highlighted on the signage unit 10 to indicate that the item or items have been chosen. The signage unit can also display information such as a sales total following a customer order. In some embodiments, data transmission links to other components of the system provide the data for displaying information on the signage unit 10. Signage unit 10 is, optionally, provided with a local input device 11, such as, for example, a CD ROM drive, data tape cartridge drive, or other input means, such as a touch screen or voice activated device, to allow alternative modes of data input to signage unit 10. The signage unit 10 can optionally have memory and computing capability that would allow it to perform some of its functions without receiving data from the local server 20, or the signage unit 10 might perform some functions using a combination of its own data and data from the local server 20. For example, the signage unit 10 could have the ability to generate images and display them from data in its own memory, using only specific inventory data and triggering signals from the local server 20. In some embodiments, a kitchen signage unit 17 provides ordering information to kitchen personnel to enable them to prepare food orders as the orders are placed at local input device 11. Kitchen signage unit 17 can be a conventional display, such as a CRT display or a signage unit 10, as described below. It can be useful, in some instances, to provide more than one kitchen signage unit 17 for greater visibility to workers in various parts of the kitchen area. It can also be useful to provide displays in different languages or to provide language option selectors on kitchen signage units 17 to enable kitchen personnel to receive information in the language with which they are most comfortable. Additionally, it can be useful to portray some information on the kitchen signage unit 17 graphically, rather than in textual form, in order to overcome language barriers or to improve ease of reading and recognition. Optionally, the kitchen area has a signage unit 10 that displays items being purchased. The information can be words or a pictorial representation of the items or both. Further, the local server 20 can use the input data to modify an optional signage unit 10 on the point-of-sale counter. The information displayed at the point-of-sale counter can be words or a pictorial representation of the items or both. A pictorial representation can eliminate the need for an employee to return to the signage unit 10 on the point-of-sale counter to refresh his memory after beginning to assemble an order. In some embodiments, the local input device 11 can be used for data input to components other than those to which they are directly connected merely by transmitting the data through the data transmission links provided from, for example, a network connection. The local server 20 couples the other components of the system through data transmission links. Other Options for the Signage Management System In some embodiments, the signage management system can include various pieces of kitchen equipment and security devices. This system can provide control and data logging for such equipment as refrigerators and freezers and cooking facilities. The signage management system can also provide alarm systems and logging of data from motion sensors and other indicators of intrusion or the presence of other people in the building with the optional display of information on a signage unit. In yet another embodiment, the signage management system is used in conjunction with an audio system. Computer Software/Hardware In one embodiment, a computer software product includes a medium readable by a processor for performing one or more of the functions described above. Alternatively, hardware can be provided to perform one or more of these functions. The hardware or a processor for the software can be located within the local server 20 or, alternatively, in a remote location, for example, within a local input device 11 or a signage unit 10 that is coupled to the local server 20. The medium is any suitable medium that participates in providing instructions to the processor. The medium can take many forms including, but not limited to, non-volatile media and volatile media. Non-volatile media include, for example, optical or magnetic disks, as a storage device, and ROM. Volatile media include RAM and dynamic memory, such as a main memory. Various forms of media can be involved in carrying one or more sequences of one of more instructions, which are readable by the processor. For example, the instructions can initially be borne on a magnetic disk of a remote computer. The remote computer can load the instructions into its dynamic memory and send the instructions over any suitable data transmission link to the local server 20. Alternatively, the local server can retrieve the instructions directly from the magnetic disk in a disk drive or load the instructions from the magnetic disk into its dynamic memory for use. The processor then retrieves and executes the instructions. The information displayed on at least one signage unit can be modified in any of the ways described above or in any way a business owner, manager, employee, or customer, as desired, wishes to instruct the processor to process the data and modify the signage unit information. Optionally, the media or other suitable media stores the data which is processed by the processor. Signage Unit Figure 3 is a schematic cross-section of one embodiment of a suitable signage unit 300 for use as, for example, signage unit 10, kitchen signage unit 17, or other signage unit used in the restaurant or other business. The signage unit 300 includes a housing 390, an image projection device 305, and, optionally, one or more mirrors 320, 340, 360. The housing 390 defines a viewing aperture 383 and an internal volume 384. A projection screen 380, which is optionally protected by transparent protective cover 381, is disposed over the viewing aperture 383. Image Projection and Mirror System The image projection device 305 is disposed within the housing 390. The image projection device 305 includes an imager 304 illuminated by light from a light source 308 that directs imaging light through projection lens system 306. The image projection device 305 typically includes a data receiver, not shown, for receiving electronic image data. The electronic image data is transmitted from local server 20 or the signage manager 9 over an image transmission link. An image transmission link includes, but is not limited to, any suitable medium for transmitting data, such as coaxial cable, other types of conductive wire or cable, optical fibers, electromagnetic wave or other wireless communication, and the Internet or other networking system. The imager 304 can, for example, be a liquid crystal display, upon which the appropriate display image is formed, or a slide or other imaging display. One example of suitable image projection device 305 is Model VPL-CSl available from Sony Corporation, Tokyo, Japan. An optional light redirecting element 382, for example, a Fresnel lens, can be provided to redirect light rays from image projection device 305 in directions more suitable for a particular viewing situation. In an alternative embodiment, images can be provided on photographic or other hard copy transparent slides and projected by a slide projector in place of a liquid crystal image projection device. In this embodiment, the signage manager or the local server provides control information concerning which slides to project. In one embodiment, the image projection device 305 projects an image along a first optical path segment 310 of a mirror system. The mirror system guides the image light and extends the optical path within the housing by redirecting the light. Multiple folds in the optical path provided by the mirrors can enable the signage unit to fit a relatively long optical path into a relatively compact space contained in housing 390. The mirror system directs the image from the image projection device 305 along optical paths 310, 330, 350, and 370 to the projection screen 380. The mirror system can include any number of mirrors for directing the image to the projection screen 380. In one embodiment, the mirror system includes a first mirror 320, a second mirror 340, and a third mirror 360, collectively referred to as mirrors. The mirrors 320, 340, and 360 are preferably lightweight when the signage unit is suspended from, for example, a ceiling or shelf. The lightweight of the mirrors 320, 340, and 360 reduces the overall weight of the signage unit 300 and provides for simplified installation. The reduced weight is important when the signage unit 300 is mounted in an overhead location, such as over an employee work area at the point of sale. Also, the reduced weight allows the installer of the signage unit to more easily lift the unit into an overhead position. In one embodiment, the first mirror 320 is disposed at a non-90° angle relative to the incoming image from the image projection device 305. The angle between the image projection device 305 and the first mirror 320 lengthens the optical path in the housing 390. Optionally, the first mirror is in a trapezoidal shape to compensate for the first mirror 320 being disposed at a non-90° angle relative to an incoming image. The trapezoidal shape can correspond to the shape of the image incident on the first mirror 320. Preferably, the first mirror 320 is not larger than the size of the incoming image. The trapezoidal shape of the first mirror 320 can reduce the size of the mirror and the overall weight of the signage unit 300. In one embodiment, the image travels the first optical path segment 310 to the first mirror 320, where the image is reflected and directed along a second optical path segment 330 to the second mirror 340. From the second mirror 340, the image is transmitted along a third optical path segment 350 to the third mirror 360, where it is reflected and directed along a fourth optical path segment 370 until it encounters the projection screen 380, which contains the image plane of projection lens system 305, Referring to Figure 3, because the light rays forming the projected images in the present invention travel in a generally diverging pattern in going from the image projection device 305 to the projection screen 380, the widest portion of the optical layout of such a system is the image projected on projection screen 380, where the term width refers to the dimension perpendicular to the viewing plane. Since the image on the projection screen 380 is the widest component in the optical layout, other components, in particular mirrors 360, 340, and 320, can be made progressively smaller (in the listed order) without loss of optical function. As a result, the weight of signage unit 300 can be further reduced. The smaller size of the first mirror 320 allows the housing 390 to be made narrower at the rear side 321 of the housing 390 than at the front side 323 of the housing 390. This feature can allow signage unit 300 to better fit into corner locations, a useful feature in retail environments where customer viewable surface area can be of high value. Mrrors 320, 340, and 360 can be of any suitably reflective material, such as a thin metallic layer coated on a suitable substrate. Because of the desire that signage unit 300 be of reduced weight, one particularly suitable type of mirror includes a metal frame over which is stretched a metallized or otherwise reflective polymeric film. Mirrors of this type are disclosed in U.S. Patents 5,247,395 and 5,841,595, herein incorporated by reference, and are commercially available from Hudson Photographic Industries, Inc., of Irvington, New York. Other mirrors can be used in polymeric interference mirrors. Such mirrors include, for example, multilayer reflective mirrors such as those described include, for example, U.S. Patents Nos. 5,448,404, 5,699,188, and 5,825,542 and PCT Patent Applications Publication Nos. WO 95/17699, WO 95/17691, WO 95/17303, and WO 96/19437, all of which are incorporated by reference, and dispersed phase, diffusely reflective films such as those described in, for example, U.S. Patents Nos. 5,783,120 5,825,543, all of which are incorporated by reference. Figure 10 is a schematic cross-section of one example of a suitable lightweight mirror. The mirror includes a reflective film 341 stretched over a lightweight frame 342. In some embodiments, the reflective film 341 includes a layer of thin plastic film 343, a reflective material layer 344, and a protective coating 345. The reflective material layer 344 includes a first surface 346 and a second surface 347 with the thin layer of plastic 343 bonded to the first surface 346. The protective coating 345 is applied to the second surface 347 of the reflective material layer 344. In some embodiments, the lightweight frame 342 includes a support surface with an adhesive 348 disposed on the support surface. The reflective film 341 is adhered to the support surface of the lightweight frame 342. Optionally, the lightweight frame 342 includes a frame support 349 filled with a lightweight material 351. For example, the frame support 349 can be aluminum or other lightweight metal or plastic material, and the lightweight material 351 is a polymeric foam. However, any lightweight metal or material can be used to construct the lightweight frame. In one embodiment, the mirrors 320, 340, and 360 are substantially flat. Other embodiments can include mirrors having an amount of curvature. Such curvature can, for example, be spherical, so as to incorporate optical power into the optical system, thereby altering the size of the projected image or altering the location of the image plane. In an alternative embodiment, cylindrical curvature can be incorporated into one or more of the mirrors so as to alter the aspect ratio of the projected image for the purpose of accommodating a screen having a particular aspect ratio. When the aspect ratio of the displayed image is altered in this manner, the data provided to imager 304 can be altered to compensate for distortion effects, thereby providing a final image having correct proportions. Methods for constructing curved thin film mirrors are disclosed in published PCT patent application WO 97/31277, incorporated herein by reference. In one embodiment, the signage unit 300 includes a mirror adjustment mechanism (not shown). The adjustment mechanism has an adjustment control, which extends partially beyond an exterior surface of the housing 390. The mirror adjustment mechanism permits the adjustment of the position of at least one of the mirrors used for directing the image. The mirror adjustment mechanism can adjust a mirror laterally in one or more directions or rotate the mirror the housing 390. The mirror position is adjusted to properly align the incoming image and the mirror and to allow an operator to provide the best quality image display on the signage unit 300. Optionally, the signage unit 300 includes multiple mirror adjustment mechanisms that correspond to the each of the mirrors disposed in the housing 390. As another alternative, the mirror can be adjusted manually from within the housing. Referring to Figure 7, an alternative embodiment of a signage unit 700 is shown, where only two mirrors 740 and 760 are employed. In this embodiment, the length of the optical path from the image projection device 705 is the sum of the lengths of image paths 730, 750, and 770 . This may be less than the path length found in the three-mirror embodiment, and can result in the image distance of the projection lens system being shorter. The two-mirror system has the advantage of reduced reflection losses and reduced signage unit weight. In the event that the shortened optical path from image projection device 705 to the projection screen 780 leads to excessively wide divergence angles for the light rays reaching the projection screen 780, a light redirecting element 782, for example, a Fresnel lens, can be useful. Figure 8 shows another embodiment of a signage unit 800 employing only one mirror 860. In this alternative embodiment, the image distance of the projection lens system of the image projection system 805 may still be shorter, since the optical path is now only the sum of the lengths of path segments 810 and 870. If the housing can be made larger, optical path segments 810 and 870 can be made longer. In the event that the shortened optical path from image projection device to screen 880 leads to excessively wide divergence angles for the light rays reaching the projection screen 880, a light redirecting element 882, for example, a Fresnel lens, can be useful. Referring to Figure 9, another embodiment of a signage unit 900 is portrayed where no mirrors are used. This configuration can be suitable for some installations where a long space, which is relatively low in height, is available for mounting the signage unit 900. In the event that the shortened optical path 970 from image projection device 905 to the projection screen 980 leads to excessively wide divergence angles for the light rays reaching the projection screen 980, a light redirecting element 982, for example, a Fresnel lens, can be provided. Air Flow System In some embodiments, an air flow system 394 controls the intake of air into the internal volume 384 of the housing 390 to filter the air entering the internal volume 384 of the housing 390, cool the internal volume 384 of the housing 390 and image projection device 305, pressurize the internal volume 384 of the housing 390, or a combination of these functions. Air intake is controlled to exclude the large amount of air borne particulates generated in, for example, the restaurant environment from the interior volume 384 of the housing 390. If air intake is not controlled, particulates, such as dust and grease, can enter the internal volume 384 of the housing 390. Air borne particulates within the internal volume 384 of the housing 390 can deposit on components, such as the mirrors or the image projection device. Deposits on the components within the interior can lead to reduced quality of the image(s) projected on the projection screen 380 or to damage to the components. In one embodiment, the air flow system 394 includes a filter 392, which is disposed over an inlet port 393 defined by the housing 390. In some embodiments, the airflow system 394 also includes a fan 391. The fan 391 is disposed over the inlet port 393 and provides a positive pressure within the internal volume 384 of the housing 390 relative to the outside, or ambient, pressure. Pressurization of the internal volume 384 of the housing 390 reduces the entry of contaminants into housing 390 through any leaks in the housing 390. The air intake 391 enables air to enter housing 390 with the air being drawn into the internal volume 384 of the housing 390 by the fan 391. The air passes through the filter 392, before entering the internal volume 384 of the housing 390. The filter 392 removes contaminates from the air entering the internal volume 384 of the housing 390. The filter 392 can be any air filter providing a desired level of filtration of contaminants, and can additionally include any suitable precipitation device, such as an electrostatic precipitation device. Optionally, the intake air is supplied from a source of clean air. While the filter 392 is portrayed in Figure 3 as being located proximate to housing 390, it can alternatively be located at a remote location, as occurs, for example, when clean air is supplied from a remote source. A variety of air moving devices can be used to inject clean air into the internal volume 384 of the housing 390. In one embodiment, the fan 391 moves air into the internal volume 384 of the housing 390. In an alternative embodiment, air can be supplied by a forced air supply such as might be provided by a building air conditioning system. In yet another embodiment, a fan or other air movement apparatus can be provided in the image projection device 305, and ductwork provided to conduct air from intake 391 to the image projection device 305. In some embodiments, the air flow system 394 is arranged and configured to cool the internal volume 384 of the housing 390. During operation of the signage unit 300, the image projection device 305 generates heat. The air flow system 394 provides cooling of the image projection device 305 and the internal volume 384 of the housing 390. In one embodiment, the air flow system 394 includes filter 392, inlet port 393, and an exit port 397 defined by the housing 390. Warmed air can pass out of the internal volume 384 of the housing 390 through the exit port to cool the image projection device 305. Optionally, the exit port 397 provides a suitable level of flow resistance, so as to maintain a positive pressure within the internal volume 384 of the housing 390, while still allowing air to exit the housing 390. In one embodiment, the air flow system 394 includes an air valve 398 disposed over the exit port 397 to prevent backflow of air and influx of contaminants into the internal volume 384 of the housing 390. The air valve 398 can be controlled, for example, by the pressure difference between the internal volume 384 of the housing 390 and the ambient pressure outside the housing. In an alternative embodiment, a wall, not shown, defines a first region and a second region within the housing 390. Preferably, the wall is transparent. The image projection device 305 is disposed within the first region of the housing and the mirror system 302 is disposed within the second region of the housing 390. The wall can provide a partition (optionally, airtight) to isolate non-cooled, contamination-sensitive optical components from those components that require cooling. In some embodiments, the air flow system 394 is configured and arranged to provide a positive pressure within the first region of the housing 390, to cool the image projection device 305 and the first region, and to filter air. In an alternative embodiment, more than one air flow system 394 can be provided for the internal volume 384 of the housing 390. For example, one air flow system 394 can be used to cool the first region of the housing 390, and a second air flow system 394 can be provided to pressurize the second region of the housing 390. Signage unit 300 can be mounted in suitable locations by a variety of mounting devices. As an example, in applications where signage unit 300 is mounted in an overhead location, a housing 390 can be provided with a suitable number of eyebolts which can receive cable attaching hooks or other cable attaching means, and cables attached to overhead structures can be used to suspend the signage unit 300. When cables are used, turnbuckles or other length adjustment devices can be interposed in the cable to provide adjustment of the cable lengths and hence adjustment of the height and orientation of signage unit 300. Other mounting devices include, but are not limited to, brackets bolted or otherwise fastened to signage unit 300 and to overhead structures. Projection Screen It is well known that the appearance of food, especially its color, is important in its customer appeal. It is therefore useful, in the graphic presentation of food items, to present images which are appealing and realistic portrayals of those foods. As used herein, the term "realistic" will mean that the graphic portrayals presented by signage unit 10 will evoke in the viewer a sensation of the probable taste of the food being portrayed, and that when the food item is eaten, the viewer will feel that the graphic portrayal is in some way consistent with the actual taste. It is also useful if the effects of ambient light on the graphic portrayals presented by signage unit 10 are reduced. In some embodiments, the signage unit 300 includes a projection screen 380 that is a rear projection screen of a type which is especially suitable for portraying graphic images of foods, in that it suppresses ambient light effects while allowing high image contrast and intense colors. It does this by providing arrays of focusing elements 410 surrounded by light absorbing material 420, as shown in Figure 4. Other projection screens can also be used. In some embodiments, the projection screen 380 includes an array of light focusing beads 410 and a transparent support 430. The transparent support 430 includes a transparent support surface 432. The array of light focusing beads is disposed on the transparent support surface 432. Typically, the light focusing beads 410 are transparent, however, any light focusing material can be used. Figure 4 shows, an individual light focusing bead 412 focusing projected light rays 401 and 403 from an image projection device. The light focusing bead 412 focuses light rays 401 and 403 to a small area coincident with a bead area 425, which allows the rays to emerge as rays 405 and 406. Each light focusing bead in the array of light focusing beads 410 focuses light rays incident to that individual bead. In some embodiments, the projection screen 380 includes a light absorbing layer 420 disposed on the transparent support surface 432. The array of light focusing beads 410 and the light absorbing layer 420 create a layer 415 which allows image rays 401 and 403 to pass through the light focusing beads 410 at the bead area 425. Much of the ambient light 411 is absorbed by the light absorbing layer 420, while a remaining portion enters the bead area 425 where it is diverted in various directions and absorbed by, for example, the internal walls of the housing of the signage unit. Referring to Figure 5, the appearance of rear projection screen images can further be enhanced by interposing a diffusing layer 550 between a transparent substrate 530 and a layer 515 containing light focusing beads 510 and a light absorbing material 520. Suitable rear projection screens are disclosed, for example, in published PCT Patent Application WO 98/45753, incorporated herein by reference. In another embodiment, the light focusing in the rear projection screen can be performed by an array of cylindrical or spherical lenses, which can be produced, for example, by microreplication methods known in the art. In yet another embodiment, projection screen 380 can further incorporate a suitably oriented light polarizing function, which can, for example, reduce the deleterious effects of ambient lighting. Multiple Signage Units Referring to Figure 6, in one embodiment, multiple signage units 602, 604, 606, and 608 are shown in an array. Any number of signage units can be used for the array. Optionally, each signage unit has a housing. Alternatively, the multiple signage units 602, 604, 606, and 608 are placed in a single housing 610. If all of the displays are placed in a single housing 610, a single rear projection screen can optionally be used for all of the displays. The multiple displays can include pictorial representations of food items and written words. Figure 6 shows individual displays for different food items. Alternatively, a single display is created from integrating individual information displays or from a single image projection device. In other embodiments, the array of signage units display, for example, menu items, prices, specials, moving displays, sequential displays, child or adult oriented information, commercials, inventory information, or customer order information. The present invention should not be considered limited to the particular examples described above, but rather should be understood to cover all aspects of the invention as fairly set out in the attached claims. Various modifications, equivalent processes, as well as numerous structures to wliich the present invention can be applicable will be readily apparent to those of skill in the art to which the present invention is directed upon review of the instant specification.

Claims: WHAT IS CLAIMED IS: 1. A system for displaying information in a retail food establishment comprising: a signage unit to display information; a local input device configured and arranged for input of data selected from a group consisting of inventory data and sales data; and a local server coupled to the signage unit and local input device, the local server being configured and arranged to modify information that is displayed on the signage unit based on the input of data at the local input device. 2. The system of claim 1, wherein the signage unit comprises: a housing defining an internal volume and a viewing aperture; a projection screen disposed over the viewing aperture; an image projection device disposed within the housing to produce an image; and a mirror system to direct the image from the image projection device to the projection screen, wherein the mirror system comprises at least one lightweight mirror, each lightweight mirror comprising a reflective film stretched over a lightweight frame. 3. The system of claim 1, wherein the system comprises two or more local input devices. 4. The system of claim 1, wherein the local input device is configured and arranged for input of data selected from the group consisting of information related to receipt of delivered items, non-receipt of incoming items, a listing of orders placed with suppliers, an overall level of stock of an item, a stock of currently prepared food items, a stock of items in the kitchen area, a stock of items at the point-of-sale, and availability of a food item. 5. The system of claim 1, wherein the local input device is configured and arranged for input of data selected from the group consisting of information related to current customer purchase information and prior customer purchase information. 6. The system of claim 1, wherein the local input device is a device selected from the group consisting of a keyboard, a touch screen, a bar code scanner, and combinations thereof. 7. The system of claim 1, wherein the local server is coupled to a nonlocal server. 8. A method for managing information on a local system in a retail food establishment, the method comprising steps of: coupling at least one information signage unit and at least one local input device to a local server; inputting data selected from a group consisting of inventory data and sales data into at least one of the local input devices; and modifying information displayed on at least one of the information signage units based on the data. 9. The method of claim 8, wherein the step of modifying information comprises modifying information displayed on the signage unit to advertise an item when an overstock of the item exists. 10. The method of claim 8, wherein the step of modifying information comprises modifying information displayed on the signage unit to not advertise an item when an understock of the item exists in the data base. 11. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to remove an item from the signage unit when the inventory for the item is below a predetermined level. 12. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to display an item in response to data input at the local input device indicating that a customer ordered the item. 13. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to display a sales total after input of a full customer order at the local input device. 14. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to advertise food items based on sales data. 15. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to advertise food items based on inventory data. 16. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to advertise food items based on kitchen data. 17. The method of claim 8, wherein the step of modifying information comprises modifying the signage unit to advertise food items based on individual customer sales data. 18. A retail sales facility comprising: a point-of-sale counter; a local input device at the point-of-sale counter, the local input device being configured and arranged for input of data selected from a group consisting of inventory data and sales data; a signage unit to display information viewable from the point-of sale counter; and a local server coupled to the signage unit and local input device, the local server being configured and arranged to modify the information that is displayed on the signage unit based on the input of data at the local input device. 19. A computer software product that includes a medium readable by a processor, the medium having stored thereon: a first sequence of instructions which, when executed by the processor, causes the processor to process data selected from a group consisting of inventory data and sales data; and a second sequence of instructions which, when executed by the processor, causes the processor to modify information displayed on at least one signage unit based on the data. 20. The computer software product of claim 19, wherein the medium stores inventory data and sales data. 21. A signage unit comprising : a housing defining an internal volume and a viewing aperture; a projection screen disposed over the viewing aperture; an image projection device disposed within the housing to produce an image; and a mirror system to direct the image from the image projection device to the projection screen, wherein the mirror system comprises at least one lightweight mirror, each lightweight mirror comprising a reflective film stretched over a lightweight frame. 22. The signage unit of claim 21, wherein the at least one lightweight mirror comprises a trapezoidal shape and is disposed at a non-90° angle relative to an incoming image from the image projection device. 23. The signage unit of claim 21, wherein the mirror system further comprises an adjustment mechanism at least partially extending from the housing to adjust the position of at least one of the mirrors. 24. The signage unit of claim 21, further comprising an air flow system, wherein the air flow system comprises a filter disposed over an inlet port defined by the housing to filter air entering the housing. 25. The signage unit of claim 21, further comprising an air flow system, wherein the air flow system comprises a fan to pressurize the internal volume of the housing. 26. The signage unit of claim 21, further comprising an air flow system, wherein the air flow system comprises an inlet port defined by the housing and an exit port defined by the housing, the air flow system being configured and arranged to cool the internal volume of the housing. 27. The signage unit of claim 26, wherein the air flow system further comprises an air valve to regulate the flow of air out the exit port. 28. The signage unit of claim 21, further comprising a wall to divide the housing into a first region and a second region. 29. The signage unit of claim 28, wherein the image projection device is disposed within the first region and the mirror system is disposed within the second region. 30. The signage unit of claim 29, further comprising an air flow system to cool the first region. 31. The signage unit of claim 21, wherein the lightweight frame comprises a frame support filled with a lightweight material. 32. The signage unit of claim 31, wherein the frame support comprises aluminum and the lightweight material comprises a polymeric foam. 33. The signage unit of claim 21, wherein the signage unit is mountable in an overhead location.

Inventors: AASTUEN DAVID J W, FLETCHER DOUGLAS D, MAHMOODI ABOLGHASSEM B, RAYKOWKI MICHAEL J, SABONGI GEBRAN J, AASTUEN, DAVID, J., W., FLETCHER, DOUGLAS, D., MAHMOODI, ABOLGHASSEM, B., RAYKOWKI, MICHAEL, J., SABONGI, GEBRAN, J.
Applicants: 3M INNOVATIVE PROPERTIES CO, 3M INNOVATIVE PROPERTIES COMPANY
Application year: 2001
Main classification: G06F17
IPC codes: G03B21, G06Q10, G07G1, G09F19