ARTICLE-INFORMATION DISPLAY SYSTEM USING ELECTRONICALLY CONTROLLED TAGS

Abstract: A product information display system has electronic display tags (20) for displaying pricing and product information for products in stores and warehouses. The electronic display tags (20) are electromagnetically coupled to a conductor (C1-Cn). A control circuit (31) is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an a-c power signal with the information signal and applies it to the conductor for transmission to the display tags (20). An electrical power system (28) supplies a-c power to the display tags (20). A main power distribution loop is connected to the power supply (28) and is magnetically coupled to multiple branch power distribution loops which extend along selected groups of display tags (20) for supplying power to those display tags (20).

Description: ARΗCLE-INFORMATION DISPLAY SYSTEM USING ELECTRONICALLY CONTROLLED TAGS Cross-Reference To Related Application This application is a continuation-in-part of pending U.S. patent application Serial No. 08/309,934, filed September 21, 1994, which in turn is a continuation-in- part of pending U.S. patent application Serial No. 08/116,468 filed September 3, 1993. Field Of The Invention The present invention relates generally to an article information-display system (which can include two-way communication) for use in facilities having a multitude of different articles. The system displays information for the individual articles and the displays can be updated from a central location. Where the facility is a store, for example, the invention is useful for displaying the price and name of each product on electronic display tags adjacent the respective products. Background Of The Invention There have been a number of proposals to automate retail price displays by the use of electronic price tags. To the extent such systems replace printed price tags, these systems are appealing to store owners because they reduce or eliminate the need to reprint and replace item price tags each time the price of an item is changed. This benefits the retailer by reducing or eliminating: the labor required to replace the price tags; the possibility of human error in replacing the price tags; the time lag involved in changing prices; and the difficulty in changing a large number of prices at once. Perhaps most importantly, such systems have the ability to overcome price discrepancies between the tag and the checkout scanners. Problems have been encountered, however, in providing the requisite information and power to the electronic tags at a reasonable cost. Also, some systems still require printed product description labels on the tags to supplement the electronic tags and thus do not eliminate the problems they were intended to solve. In systems in which the electronic tags are hard wired, installation and removal of the electronic tags is expensive and impractical. Systems which use exposed wires and connectors are undesirable because they reduce the system's reliability and subject the system to damage from electrostatic discharges, spillage and surface oxides. Other systems lack the ability to verify the accuracy of the displays and the proper functioning of the electronic tags while the system is in operation. A number of wireless display systems have been proposed which rely on infrared, acoustic, or radio frequency broadcast for transmission of product information to the display tags. These wireless tags require a battery for powering each tag. Adding a battery to the tag increases the cost of each tag and can make the overall system unaffordable for many applications. Moreover, since a single retail establishment often contains as many as 20,000 to 50.000 display tags, replacement of the batteries and reprogramming such a large number of tags is time-consuming and costly. The radiated signals can also be shielded, for example, by steel freezer cases, causing communication "dead spots" in a store. Moreover, disposing of batteries has an adverse environmental impact. If there are just 50,000 installations with 20.000 tags each, that is a billion batteries that have to be disposed of on a routine basis, and the labor involved in replacing the batteries and reprogramming at each battery change is costly as well. Effective use of such systems requires a battery management system so that the batteries can be replaced before failure, or before the quality of the tag's display diminishes to an unacceptable level. Further, because the tags in a wireless system generally do not communicate problems to the computer, the tags have to be visually monitored to identify problems such as bad or faint tags. Another problem in most previously proposed electronic display tag systems is that the tags have been relatively thick, causing them to protrude from the shelf rails on which they are mounted. Protruding tags are subject to damage by shopping carts, and they can impede the movement of store customers within the aisles. Further, the protrusion of the tags into the aisle invites tampering and can result in theft of the electronic tags. Summary Of The Invention It is a primary object of the present invention to provide an improved electronic display tag system in which the tags require neither batteries nor direct electrical contacts, as a result of which the tags can be economically produced and maintained with a high degree of reliability. It is another object of this invention to provide an improved electronic display tag system which is extremely energy-efficient and which can be sustained during prolonged power outages without the use of batteries in the tags, so that there is no need to re-initialize the system after a power outage. Another important object of this invention is to provide an improved electronic display tag system in which each tag is a sealed unit so that it cannot be damaged by the spillage of products stored adjacent the tags, and so mat there are no exposed electrical contacts subject to corrosion or ESD. A further object of this invention is to provide an improved electronic display tag system which provides two-way communication between the display tags and the controller or controllers for the tags. A related object is to provide such an improved electronic display tag system which permits continual verification of the accuracy of the displays and the proper functioning of the various display tags. Yet another object of this invention is to provide an improved electronic display tag system which does not rely on radio frequency (RF) signals or infrared signals and thus is not susceptible to problems from blockage or shielding of such signals or interference from other equipment using similar frequencies. A still further object of the invention is to provide an improved electronic display tag system which permits the display tags to be located at any desired position along the lengths of the shelves on which the products are located. Another object of this invention is to provide an improved electronic display tag system which does not produce radiation emission problems. Still another object of this invention is to provide an improved electronic display tag system which can be easily and efficiently initialized. It is also an object of this invention to provide an improved electronic display tag system which deters tampering and reduces the possibility of damage by recessing the tags and concealing most other functional elements. A further important object of this invention is to provide an improved electronic display tag system which permits the display of a variety of different types of product information such as prices, product descriptions, unit prices, multilingual information and the like. Another object is to provide an improved electronic display tag system which is extremely reliable and has a relatively small number of parts so as to provide a high MTBF (Mean Time Between Failure). A further object is to provide an improved electronic display tag system which does not involve any significant waste disposal problems. It is a further object of the present invention to provide an improved electronic display tag wiring system which avoids the need for electrical contacts in the numerous connections among the various components of the system. A related object is to provide an improved electronic display tag system which does not require batteries or photovoltaic sources in the tags. It is anotiier important object of this invention to provide such an improved electronic display tag wiring system which facilitates the installation of the thousands of feet of wire required in such a system. In this connection, a related object of the invention is to provide such an improved system which also facilitates re-location of gondolas or of the shelves within a gondola. A further object of this invention is to provide an improved electronic display tag wiring system which significantly reduces the cost of installing and maintaining the system. Yet another object of this invention is to provide such an improved electronic display tag wiring system which virtually eliminates any risk of losses due to electrostatic discharges. A still further object of this invention is to provide an improved electronic display tag wiring system which greatly reduces the need for periodic replacement of corroded parts. Other objects and advantages of the invention will be apparent from the following detailed description and the accompanying drawings. In accordance with the present invention, the foregoing objectives are realized by providing an electronic display tag system which includes a multiplicity of electronic display tags, an electrical power supply for supplying a-c. power for the multiplicity of the display tags, a controller circuit for providing information signals for the multiplicity of the display tags, a modulator receiving the power signal and the information signals for modulating the power signal with the information signals. multiple branch distribution loops each of which extends along a selected group of the display tags for supplying power and control signals to the display tags, and a main distribution loop connected to the power supply and control signal source and magnetically coupled to the branch loops for supplying power and control signals to the branch loops, a pick-up coil within each display tag and inductively coupled to the conductor for receiving the modulated power signal, a demodulator within each display tag for demodulating the modulated power signal, and a display circuit within each display tag for generating a display in response to the information signals derived from the demodulated signal. Brief Description Of The Drawings FIG. 1 is a perspective view of a typical layout of part of a retail store equipped with a product information display system arranged in accordance with the present invention; FIG. 2 is a block diagram of a product information display system, also in accordance with the present invention; FIG. 3 is a block diagram of the system controller shown in FIGS. 1 and 2; FIG. 4 is a block diagram of one of the area controllers shown in the system of FIG. 2; FIG. 5 is an illustration of the format of the binary word that is used for communication between the area controller and one of the electronic display tags shown in the systems of FIGS. 1 and 2; FIG. 6 is a schematic diagram of an implementation for the electronic display tag shown in the systems of FIGS. 1 and 2; FIG. 7 is a schematic diagram of an alternative implementation for the electronic display tag shown in the systems of FIGS. 1 and 2; FIGS. 8a, 8b and 8c are flow charts showing how the area controller of the systems of FIGS. 1 and 2 can be implemented; FIGS. 9a, 9b, 9c and 9d are flow charts showing how the display tag of FIGS. 1 and 2 can be implemented; FIG. 10 is an enlarged front elevation of an implementation of a display tag for use in the system of FIGS. 1 and 2; FIG. 11 is an enlarged front elevation of the liquid crystal display used in the tag of FIG. 10; FIG. 12 is an enlarged section of an implementation of the display tag and conductor mounted on a shelf rail; and FIG. 13 is a front perspective view of the implementation shown in FIG. 12; FIG. 14 is a front elevation of a display tag arrangement for display racks of the type used to display products in blister packs; FIG. 15 is a front elevation of a display tag arrangement for multiple product bins in a warehouse; FIG. 16 is a perspective view of a typical layout of pan of a retail store equipped with a product information display system embodying the present invention; FIG. 17 is an enlarged view of a portion of FIG. 16; FIG. 18 is an enlarged section taken generally along line 18-18 in FIG. 17; FIG. 19 is an enlarged plan view of the end portion of the module mounted on the top of one of the gondolas illustrated in FIGS. 16 and 17; FIG. 20 is an enlarged end elevation of one of the gondolas illustrated in FIGS. 16 and 17; FIG. 21 is an enlarged side elevation of one of the two vertical wiring modules included in each gondola, as illustrated in FIG. 20; FIG. 22 is a section taken generally along line 22-22 in FIG. 21; FIG. 23 is a section taken generally along line 23-23 in FIG. 21; FIG. 24 is a further enlarged end elevation of the top portion of me gondola illustrated in FIG. 20, with the end wall of the gondola broken away to show the internal structure; FIG. 25 is a schematic illustration of a portion of the main distribution loop in the system of FIGS. 16-23; FIG. 26 is an enlarged and exploded view of the junction box mounted on the top of the end poπion of the gondola illustrated in FIG. 25; FIG. 27 is a side elevation of the exploded junction box of FIG. 26; FIG. 28 is a diagrammatic exploded side elevation of the various wiring and coupling modules included in the power and communication system illustrated in FIGS. 16 and 17: FIG. 29 is an enlarged vertical section through one of the shelf rails in the system of FIGS. 16 and 17; FIG. 30 is a side elevation of the rail of FIG. 29 with the wiring installed thereon; FIG. 31 is a vertical section through one of the shelves in the system of FIGS. 16 and 17, and illustrating the electrical wiring arrangement at the rear of the shelf; FIG. 32 is an enlarged side elevation of one of the wiring elements illustrated in FIG. 31; FIG. 33 is an end elevation of the wiring element of FIG. 32; FIG. 34 is an enlarged end elevation of one of the shelves in the system of FIG. 16; FIG. 35 is an exploded perspective view of one of the magnetic core units used to form the magnetic coupling between the wiring on one of the shelves and one of the vertical wiring modules; FIG. 36 is a top plan view of the magnetic core module illustrated in FIG. 35; FIG. 37 is a side plan view of the module illustrated in FIG. 36: and FIG. 38 is an end elevation of the module of FIGS. 36 and 37, after the module has been closed around the two pairs of connectors that complete a magnetic coupling. Detailed Description Of The Preferred Embodiments The present invention has application in a variety of article-information display environments. These environments include, among others, grocery stores, hardware stores, auto-parts stores, warehouses, and other establishments where variable article information is displayed at remote locations. The present invention is particularly advantageous when it is used in a large store where there may be as many as 50.000 different items of merchandise placed on shelves throughout the store, and thousands of prices may change each week. Such an environment is typical in a retail grocery store, and it is this context that the present invention will be described. This invention is also particularly useful in warehouses containing numerous bins of small parts that are coded or marked with other types of identifications which are difficult to read. FIG. 1 depicts part of a retail store including a product information display system arranged according to a preferred embodiment of the present invention. The system includes a plurality of display tags 20 disposed along riie front rails 22 of the store's multiple display shelves 24. The prices, descriptions and/or special information for all the products are displayed on the front edges of the shelves, near the respective products. Typically, there is a one-to-one correspondence between each display tag 20 and a particular item of merchandise. Although certain applications may require a display tag 20 to display product-related information regarding multiple products, e.g., the respective products above and below the display tag 20, preferably each display tag 20 displays information for only one product. The information to be displayed at each display tag 20 is provided by a system controller 28. The system controller 28 communicates with the display tags 20 through a shelf-mounted area controller 31 using multiple conductors C,, C 2 ... C n , each of which forms a large loop to communicate with a large number of display tags 20 in a prescribed area. Typically a single area controller 31 services at least 1000 tags, and each loop services several hundred tags. Each area controller 31 is contained in an enclosed housing which is mounted in a relatively hidden position on the bottom side of one of the shelves. The system controller 28 regularly communicates with the display tags for monitoring and reporting display tag failures to the system user and for identifying service inquiries and updating the display information, e.g., with price changes. The display tags serviced by any one of the wire loops are usually located on a number of different shelves. By limiting the length of a horizontal run of the conductor C to four feet (a typical modular shelf length), non-contiguous shelf lengths can be accommodated with the conductor C weaving across one four-foot length, below to the underlying four-foot length, etc. The bottom shelf, however is typically a single unit extending along the entire length of an aisle, and thus the conductor C preferably extends continuously along the entire length of the bottom shelf. FIG. 1 also illustrates a communication link 32 between the system controller 28, an in-store computer and check-out scanners (not shown in FIG. 1). This link 32 is also used by the system controller to receive update price information from the store computer (not shown). The same computer supplies data to both the tags and the scanners so that a new price for a particular product is updated in the display tag 20 at the same time the price is sent to the check-out scanners, thereby ensuring that the price displayed on the display tag 20 for the product is the same as the price displayed for and charged to the customer at the check-out scanner. FIG. 2 illustrates the product information display system of FIG. 1 in block form. The system includes a plurality of area controllers 31 coupling the system controller 28 to various sets of display tags 20. Each set of display tags 20 is associated with one of the multiple wire loops C C n connected to each area controller 31. The area controllers 31 communicate with the tags 20 using a conventional modulation protocol such as amplitude-shift-keying (ASK), which is a binary form of amplitude modulation. Other communication schemes, such as frequency shift keying (FSK) or phase modulation, can be used instead of ASK if desired. Communication between the area controllers 31 and the system controller 28 is effected using a conventional serial two-way communication protocol, preferably a network interface compatible with the RS422 or RS485 standard. Each of the area controllers 31 is powered by a d-c. power supply within the system controller 28. By controlling the display tags 20 through the area controllers 31, several advantages are realized. For instance, the communication speed between the system controller 28 and the display tags 20 is increased (because it is not necessary for the system to talk to each tag), the processing power required in the system controller 28 is decreased, and a level of modularity is provided for expanding use of the display tags 20. Further, use of the area controllers 31 significantly reduces the cost of the system by avoiding the need for an RS485 type interface at each tag. Both the tags and the area controllers store data and with their interactive communications check each other as pan of the auditing and failure identification system. There is redundant power back-up with a battery in the system controller and in each area controller. The cost of individual tags is reduced because certain of the electronics in the area controller does not have to be duplicated in thousands of tags, and there is more flexibility for special display messages. The system of FIG. 2 also includes an in-store computer 40 which communicates with a remotely located central office 42 using a modem. The in-store computer 40 provides a database of information, received from the central office 42 (or from a scanner controller), for all the merchandise in the store. The database is used to link each product with a physical-location address, an alpha-numeric (or UPC) description, a price, and a unit cost and general inventory information. The database may be accessed for the check-out scanners 44 as well as the system controller 28. Changes in the database of the in-store computer 40 are generally initiated by updates received from the central office, but database changes producing display changes can also be made directly at the in-store computer 40. After receiving the product data from the in-store computer 40. the system controller 28 selects the desired display information and associated display tag address, and converts this display information into a data stream for transmission to the appropriate area controller 31. The area controller 31 then forwards this information to the particular wire loop C,-C n which includes the designated tag 20. Also associated wirh the system controller 28 is a printer 46 and a battery back-up unit 48. The printer 46 may be used to make hard copies of the desired displays, for example on regular or transparent paper, for insertion into a shelf rail at any locations not covered by the electronic tags 20. The printer can also be used to generate store or system reports. The battery back-up unit 48 is used to maintain system integrity during periods of power interruption. As illustrated in FIG. 3, the system controller 28 may be implemented using a personal computer 28 (such as a 486 or equivalent) containing a number of network boards configured for serial two-way communication with the area controllers 31. Or communication can be accomplished with conventional RS422/RS485 interfaces or equivalent. The system controller 28 also contains a conventional hard-drive 62 for programs, protocols, addresses and storage, and power and data distribution circuits 64a, 64b, etc. for all the area controllers 31 in the system. Each distribution circuit 64 transmits and receives serial data over one set of lines 68 and sends d-c. power over another set of lines 70. A rechargeable 24-volt d-c. battery 72 is used as me power source, with an a-c. -powered battery charger 74 activated as necessary to maintain an adequate charge on the battery 72. The battery 72 is the primary power source for the area controllers 31, emergency power for the system is also provided from this battery. Referring now to FIG. 4, one of the area controllers 31 is shown in expanded form. Each area controller 31 receives the data from the outputs of the network boards of the system controller 28 and translates the data into an information/power signal that is applied to one of the conductors C r C- for transmission to the display tags. Data transmission to the tags is typically at 1200 baud using ASK. Each area controller 31 includes a network interface circuit 80 such as an RS485 transceiver circuit, a microcomputer or microprocessor (MPU) 82, a memory 84, and a plurality of transceiver circuits 86, one for each of the conductors C,-C n . Using the transceiver circuits, the microprocessor 82 receives the product data from the network interface 80 and determines on which conductor the display tag address resides. The microprocessor 82 then generates an information signal for modulating an a-c. power signal supplied to the selected conductor so that the information signal will be conveyed to the desired display tag 20. In a preferred embodiment, the nominal frequency of the power signal carried by each of the conductors C,-C n is 50 KHz. Each transceiver circuit 86 in the area controller 31 includes a digital-to- analog converter 88, a voltage-to-current driver circuit 90, and a phase-locked loop (PLL) circuit 92 or equivalent detector circuitry. The digital-to-analog converter 88 converts the digital information signal from the microprocessor 82 into analog form. Alternatively, a straight analog communication scheme with an analog oscillator can be used. The resulting analog signal is connected to the input of the driver circuit 90, which converts the analog voltage into a proportional current for driving the display tags 20 via one end of one of the conductors C,-C„. The other end is terminated at ground for the area controller. The area controller 31 also includes a transformer 87 whose primary is in series with one of the conductors C,-C n . The transformer 87 produces a secondary voltage proportional to the primary current which is fed back to the voltage-to-current converter 90 and to the PLL input. The PLL circuit 92 senses the presence or absence of the known sub-harmonic frequency signal from any of the tags. This signal is then decoded by the MPU 82. A superheterodyne receiver may be used as an alternative to the PLL. A d-c. to d-c. converter and battery charger 94 is used to charge a back-up battery 96, which provides at least one hour of operating power to the area controller 31. The charger 94 receives its power from the 24- volt d-c. supply 72 in the system controller 28 (FIG. 3). Thus, in the event of a power failure in the system controller 28, or during shelf relocation, the area controller 31 is able to provide uninterrupted power and control to the display tags 20 for at least one hour. This period of time should be sufficient to permit repair, and if more time is needed the battery 96 can be backed up as needed, or the tags can be put in a sleep mode, as described in more detail below. As illustrated in FIG. 4, the location of the input end of the conductor alternates between the tag and bottom of vertically adjacent shelves. This causes any radiated signals from the loops on adjacent shelves to cancel each other, so that the overall system does not cause any radiation emission problems. The alternate phasing of the loops also reduces cross-talk between adjacent conductors and reduces the susceptibility of the system to radiation from other sources. FIG. 5 illustrates a preferred type of serial communication between one of the area controllers 31 and the associated display tags 20. The serial data sent from the area controller to the display tags may include a tag address ("select one tag") or a selected group of tags, an "all tag" command to which all tags respond when they recognize a special address, a "load selected" command which includes a particular tag address, a "load subroutine" command which loads a set of data in the unused portion of a particular tag's memory, a "service inquiry" command to query whether any tags need to communicate with the area controller, a "reset" command for resetting a particular tag, a "request checksum" command which is responded to by a tag sending a checksum corresponding to its down-loaded data (this is a price verification routine), a "request data" command which invites a tag to send selected data to the area controller, or "sleep" or "wake-up" commands which respectively remove and apply on-board power to certain circuits for each tag. The serial data sent from the display tag to the area controller includes requests and responses. An "Ack" response means that the tag received the communication from the area controller, and a "Nak" response means that the communication failed. A "Request" is an affirmative response to a service invitation to send data to the area controller, and "Data" is the data sent in response to the area controller requesting the data. FIGS. 6 and 7 illustrate two different embodiments of the display tag 20. Common reference numerals are used for common components in the two diagrams. The differences between the embodiments of FIGS. 6 and 7 concern the type of inductor 110 (or 110') utilized and the signal processing performed by a rectification circuit 114 (or 114'), a power supply circuit 116 (or 116'), and a signal conditioning circuit 118 (or 118'). Data sent to the display tag 20 via the conductor C is received by the display tag 20 using inductive coupling. A pick-up coil or inductor 110 (or 110') is located close enough to the conductor C to cause the changing electromagnetic field around the conductor C to induce a corresponding current in the inductor 110. This induced current provides the display tag 20 with both the necessary operating power and the data for the display without requiring any physical contact between the display tag 20 and the conductor C. The inductive coupling of both power and information signals to the tags eliminates the need for batteries in the tags and for physical contacts between the tags and the wire loop. This minimizes the cost of the tags, and also avoids problems caused by contact corrosion and electrostatic discharges. The preferred embodiment of the pick-up coil 110 is a single coil with a full wave bridge rectifier as shown in FIG. 6, but if desired two separate windings may be used, with one winding connected for data decoding (or demodulation) and the other winding connected for supplying power to the display tag. The pick-up coil in the preferred embodiment can be implemented by winding 43 turns of #32 enameled wire in a channel molded into the outer periphery of the tag housing, as described in more detail below in connection with FIGS. 12 and 13. A capacitor 112 is connected in parallel with the inductor 110 to form a parallel tuned circuit that is responsive to a particular range of frequencies centered about the carrier frequency transmitted by the area controller. This resonant circuit maximizes voltage gain and significantly improves coupling efficiency. In FIG. 6. the current induced in the coil 110 is sent through a full-wave rectifier 114 to provide a positive input to a power supply circuit 116 and a signal conditioning circuit 118. The output of the voltage regulator 124, which is connected to a capacitor 126, provides operating power (V cc ) for the display tag 20. The signal conditioning circuit 118 is preferably a Schmidt buffer which improves the rise and fall times and the signal-to-noise ratio of the signal from the coil 110. The circuit 118 can be implemented using a commercially available buffer having hysteresis control. In FIG. 7, the induced current is produced in a pick-up coil formed by a center- tap inductor 110'. The ends of the inductor 110' are connected to a pair of rectifying diodes 114'. 114" to provide a full-wave rectified positive signal for the circuit 118'. The diode 114" can be removed (replaced by a wire) for an operable half-wave rectified signal. The power supply circuit 116' draws current from the center-tap of the inductor 110' and includes a voltage regulator 124 and a capacitor 126 at its output for providing operating power (V ^ ) for the display tag 20. The power supply circuit 116' is connected to common (ground) for returning current through the diodes 114', 114" to the inductor 110'. In both FIGS. 6 and 7, the output of the signal conditioning circuit 118 or 118' is pulse-extended using a monostable vibrator circuit 142. The output of the circuit 142 is monitored by a microcomputer (CPU) 146 for demodulating the data. A universal-asynchronous-receiver-transmitter (UART) 144 converts the sequential digital pulses from the circuit 142 into parallel format for use by the CPU 146, and vice-versa. An oscillator 147 provides the operating clock signal for both the UART 144 and the CPU 146. A manually adjustable trimming resistor 149 replaces the normally used crystal or ceramic resonator, but produces a much larger variation in oscillator frequency from tag to tag. This variation is compensated for by synchronizing the oscillator frequency to the carrier frequency, thereby permitting the use of an R-C oscillator and eliminating the cost and size of a crystal. In this instance, the oscillator cycles are counted during each half cycle, or multiple, of the rectified main primary frequency (50 KHz wave rectified to 100 KHz wave). This count is then used to generate internal frequencies that may be needed for communications. Depending on the type of CPU 146 that is used, the buffer 118 (118'), the monostable vibrator circuit 142 and the UART 144 may not be required, since many microcomputers have input ports which can accommodate and process analog signals directly. With such microcomputers, the UART-related functions are implemented in software. The microcomputer (CPU) 146 uses conventionally configured operating memory, including ROM 148 and RAM 150, and an LCD display memory 152. 154 for maintaining an assigned display set on an LCD display 156 and communicating with the area controller 31. The display 156 is preferably driven using a conventional two-row display driver circuit 158 controlled by the CPU 146. To permit input signals to be manually generated at the tag, a pair of membrane switches 166 are accessible on the outside surface of the tag housing. Buffers 168, each having a conventional input pull-up resistor or current source, are connected to the switches 166, and the outputs of the buffers 168, are supplied to the CPU 146. Use of low-power CMOS circuitry is preferred for the tags 20. This permits the power draw from the conductor C to be maintained under 25 milliwatts per tag. In a preferred embodiment, a custom CMOS integrated circuit (IC) mounted on the printed circuit board contains all of the electronics except the display, the tuned circuit, the FET 159, the capacitor 126 and the switches 166, and requires very little power to operate. The display tag 20 can transmit signals to the area controller 31 by an impedance modulation scheme which changes the impedance of the tag circuit that is inductively coupled to the conductor C, thereby changing the impedance of the loop formed by the conductor C. This impedance change is detected by the phase-locked loop 92 in the area controller 31. To initiate such an impedance change in a display tag, the UART 144 turns on a JFET connected in parallel with the resonant circuit 110, 112. The conduction of the JFET 159 shorts the capacitor 112, thereby changing the impedance of the circuit coupled to the conductor C. Thus, by modulating the impedance of the tag circuit by successively aiming the JFET 159 on and off, a signal may be induced in the conductor C at a frequency which is a sub- harmonic of the a-c. power signal which serves as the carrier signal. To avoid naturally generated noise, the sub-harmonics are preferably generated by rendering the JFET 159 conductive during odd-number half cycles of the a-c. power signal in the wire loop. For example, if the JFET 159 is turned on during only one half cycle out of three successive half cycles of the a-c. power signal in the wire loop, the frequency of the signal induced in the loop by the tag is 2/3 the frequency of the a-c. power signal. Naturally occurring sub-harmonics do not occur at odd fractions of the primary frequency, and thus will not interfere with the signal artificially generated by the impedance modulation. With full wave rectification, the frequency of the induced signal is (2F C )/N, where F c is the carrier frequency and N is a positive odd integer. The half cycle count with full wave rectification is 2F C . When the FET is turned on every third half cycle, for example, N is 3 and the sub-harmonic is 2/3 F c . In the preferred implementation of the impedance modulation scheme, a bit of data is represented by a burst of one or more cycles of the artificially generated sub- harmonic signal. Successive bursts, of course, must be separated by periods of no impedance modulation to enable each separate burst to be detected as a separate bit of data. To transmit both states of a binary bit of data, i.e., a "0" or a " 1", the a-c. power signal can be modulated at either of two different artificially generated frequencies. For example, a "1" can be represented by a signal having 2/3 the frequency of the a-c. power signal, while a "0" is represented by a signal having 2/5 the frequency of the a-c. power signal. This impedance modulation technique is a way of transmitting data from the tag to the area controller in a manner which is virtually powerless. The only consumed power is that needed to mm the FET on and off. Signals induced in the wire loop by impedance modulation in a tag are detected in the phase-locked loop 92 in the transceiver 86 of the area controller 31. The area controller's micro-processor 82 then decodes this information and determines which tag is the source of this signal. The area controller then processes this data for functions controlled by the area controller such as check sums for price verification or passes information onto the system controller 28. Returning to FIGS. 6 and 7, the microcomputer 146 in the tag includes I/O buffers 160 and capacitors 162 for storing an assigned the bits of charges representing display tag address. The microcomputer 146 stores the down-loaded address for the tag by writing the address to the I/O buffers 160. The ports on the other side of the buffers 160 are connected to the capacitors 162. In the event of a power failure, the address is preserved by the charge on the capacitors 162 for a certain period of time. If desired, alternative means of temporary storage may be used. As part of a multi-tiered power-backup system, the battery 96 in the area controller 31 maintains all the tags serviced by that controller in normal operation for a selected time interval following a power failure. At the end of that time interval, which is determined by the MPU 82 in the area controller, the MPU 82 generates a signal which causes the CPU 146 in each tag to mm off the tag display. All the address and product information remains stored in the tag memory, including the capacitors 162. This second stage of the power-failure mode of operation is continued for a specified period of time after which the data stored in each tag's RAM 148 and ROM 150 is erased, and only the tag addresses are preserved by the battery backup in the area controller. When the battery is exhausted, the capacitors 162 then preserve the addresses as long as the charge on the capacitors 162 is sustained. In the event a tag is removed temporarily from a rail, the capacitors 162 will maintain the address for a few minutes so that it is not necessary to manually reprogram the tag when it is reinstalled, as long as the address is maintained. This multi-level approach provides extensive safeguards to a variety of power-failure conditions. Address programming for each tag 20 is accomplished by entering the start-up mode. The first address and associated product information data is generated by the system controller and fed to the area controllers for transmission to the display tags. This product information data appears on all the display tags running in the start-up mode. An installer then manually triggers a membrane switch 166 on the particular display tag which is to be identified by the first address, and which is to display the product information data associated with that address and the shelf product adjacent to it. When the switch is triggered, the CPU 146 captures the address and associated product information data and exits the start-up mode, thereby initiating the normal run mode in the display tag. In the normal run mode, the display tag will continuously display the product information data which is contained in the memory of the display tag until it receives an address which matches its stored address, at which time it will update the display in accordance with the information data immediately following the received address. Upon exiting the start-up mode, the display tag sends a confirmation signal back to the system controller 28 via the conductor C and area controller 31 to inform the system controller that the first address has been captured by the appropriate tag. The system controller then sends the next address and associated product information data to the display tags. This new product information data is again displayed on all the tags that remain in the start-up mode. Visual inspection to make sure this adjacent shelf product agrees with the tag displayed information and manual triggering of successive display tags continues until all the display tags have captured addresses and display data. After any given display tag has captured an address during initialization, the system controller is able to update the information in that tag at any time. During initial system installation only authorized personnel will have access to the display tag rails. Large retail stores typically have complete product location data in their databases, and thus the products in each area controller zone can be sorted in a sequence that enables the installer to walk down the aisle and activate the tags sequentially. This saves a significant amount of time. As shown in the flow chart of FIG. 8a, for communication between an area controller 31 and its tags, the data base for the tags associated with the area controller is first loaded via the system controller. Block 180 of FIG. 8a depicts this first step. After initiating the serial communication routines (block 182) and sending the product data for initializing the first tag (block 184), the MPU in the area controller determines if all tags on the system have been initialized (block 186). If the data has been sent for all the tags, the step of down-loading is complete and this routine ends, as depicted at block 188. The initial pass through block 186. however. will lead to the step of block 190 in which the MPU broadcasts the information for the next tag associated with the area controller. At block 192. the MPU waits for one of the tags to respond. If the response is an "Ack" (block 194), flow proceeds to block 196 where the MPU increments the data buffer for initializing the address for the next tag and then proceeds back to block 186. If the response is not an "Ack" (block 194), flow proceeds to block 198 where the MPU determines whether a tag has responded with a "Nak". A "Nak' } indicates an error which is handled in block 199, and then flow returns to block 188. If it is neither an "Ack" nor a "Nak", the system tries to load the tag again until it times out. It then reports the error and proceeds to the next tag. This continues until all the tags are initialized with the appropriate address and product information. FIG. 8b illustrates how each area controller operates once the step of down¬ loading is complete. Blocks 200, 202 and 204 respectively depict starting the normal operation program, phase locking to the 50 KHz power signal and broadcasting to the tags for a service request. At block 206, the area controller determines if one of the tags has responded to the service request. If there is a response, the request for service is handled as shown at block 208. If there is not a response, the area controller determines that there is no tag requesting service and flow proceeds to block 210 where a communication check for each tag in the system is begun. At block 210. the next tag is selected. At blocks 212, 214 and 216, a cyclic redundancy code (CRC) is requested from this next tag, returned by the tag and analyzed by the area controller's MPU to ensure that the tag data is correct and the tag is properly communicating. To ensure the integrity of the communication, the MPU preferably uses the "Load Subroutine" command to send data to the tag changing the loaded database. This forces the tag to send back a new CRC, which the area controller checks and verifies. If proper communication is intact for the selected tag, flow proceeds to block 218 where the MPU determines whether all the tags have been serviced. If not flow returns to block 210 for servicing the next tag. If all the tags have been serviced, flow returns to the beginning of the program at block 200. If the CRC is not intact for the selected tag, flow proceeds from block 216 to blocks 220 and 222 where the area controller's MPU sends a down-load command and down-loads the initialization data for the tag that is not properly communicating. From block 222, flow proceeds to block 224 where the MPU executes another CRC poll, as described above, to ensure that the data was properly received by the tag and that the integrity is still intact. If the data was properly received, flow proceeds to block 218 to determine if all the tags have been serviced. If the data was not properly received, flow proceeds to blocks 226 and 228 where the MPU continues to attempt to get the data to the tag for a period of time and then reports the malfunction to the system controller. From block 228, flow returns to block 204 where another broadcast service request is made and the process repeats. Referring now to FIG. 9a, a flow chart shows how the display tag is programmed to initialize the tag with an address and to bring the tag "on-line" . This programming mode starts at block 230 and proceeds to block 232 where the microprocessor in the tag performs a power-on self-test (block 232) involving memory and register checks. At block 236, a test is performed to determine if the self-test passed. If not, flow proceeds from block 236 to 234 where the tag reports the error via the visual display. If the self-test passes, flow proceeds from block 236 to block 238, 240 and 242 where UART is initialized and the tag's clock is adjusted and phase-synchronized to the frequency (50 KHz) sensed on the power signal carried by the conductor. From block 242, flow proceeds to block 244 where the tag temporarily assigns itself tag "00," so that it can receive the "Load AH" command from the area controller for address initialization. At block 246, the tag monitors the power signal on the conductor to determine whether or not the tag has received a data packet. If a packet is received, flow proceeds from block 246 to block 248 where the tag stores the embedded address. Within the packet is the product information. From block 248, flow proceeds to blocks 250 and 252 where the tag stores the information to be displayed and displays that information on the tag's visual display. From block 252, flow proceeds to block 254. At block 254, the tag determines if the initialization key (switch) has been manually pressed. If not. flow returns to block 246 to continually look for a packet transmitted to this tag. From block 254, flow proceeds to block 256 in response to detecting that the initialization key switch has been manually pressed. At block 256, the tag address received within the packet is adopted by the tag. From block 256, flow proceeds to block 258 where the tag goes on-line by sending an "Ack" communication to the area controller. At block 260, the tag is depicted as going on-line. This ends the program mode for initializing the tag. After initialization, the tag is ready for normal operation, which is depicted by the flow chart in FIG. 9c. This flow chart begins at block 262 and block 268 where the tag immediately begins monitoring the conductor to determine whether an information pack has arrived from the area controller. If such a packet has arrived, flow proceeds from block 268 to block 270 where the tag compares the address embedded in the information packet with the address of this tag to determine if the packet is for this tag. If it is not for this tag, the tag determines whether the packet represents a broadcast to all tags (such as "STORE IS CLOSING"), as depicted at block 272. If the information packet is for this tag, flow proceeds from block 270 to blocks 274 and 278 where the tag identifies and executes the necessary action associated with the received information packet. From block 272, flow proceeds to blocks 274 and 278 if the packet is associated with a broadcast for all tags (the "All tags" command). From block 268, flow proceeds to block 280 in response to the tag determining that a packet has not arrived over the conductor. At block 280, the tag performs a test to determine whether a manual button sequence has been entered. If such a sequence has not been entered, flow returns to block 268. If a manual button has been depressed, flow proceeds from block 280 to blocks 282 and 284 where the tag determines if the sequence is one of the valid sequences. If it is not a valid sequence, flow returns to block 268. If it is a valid sequence, flow proceeds from block 284 to block 286 where the command is executed. From block 286, flow proceeds to block 288 where the buffer is cleared and flow returns to block 268. The sequences are binary numbers entered by depressing membrane switches representing "0" or "1 ". Valid sequences include binary sequences corresponding to requests for: resetting the tag; entering the cursor mode (FIG. 9c); verifying the status of the tag and verification codes. Clearing the software buffer which stores the binary digits entered through the switches occurs after a time-out. Turning now to FIG. 9d, a flow chart for implementing the cursor mode for the display tag is shown. This routine is executed in response to a valid manually- entered sequence. The cursor mode begins at blocks 290, 292 and 294, where the tag sets up the display with a cursor position movable by one of the buttons, the scroll button. At blocks 296 and 298, the tag performs a test to determine whether a scroll button has been depressed. If so, flow proceeds to block 302 where the tag changes (or scrolls through) to the next cursor code position. From block 302, flow returns to blocks 296 and 298 where the tag performs yet another test to determine if the scroll button has been depressed. This continues with the display code position being changed with each depression of the scroll button (switch). When the other switch (the "select button") is depressed, the current cursor position is equated with a package (or function), as indicated at block 306. The current position of the cursor is returned to the area controller thereby selecting the associated data block. The area controller may optionally await a verification to be entered into the buttons on this tag before acting on selected data. In summary, one membrane switch is used to select a displayed code and position the cursor to a selected display character position, and the other switch is used to terminate the cursor mode, selecting the last position of the cursor. Such an implementation is ideally used for reordering products and alerting the system controller as to the status of the product for the associated tag. From block 306 flow proceeds to block 308 where the tag sends the set of selected codes to the area controller. At block 310, the tag resets the display. FIG. 10 illustrates a front view of the tag 20 shown in the previously- discussed figures and FIG. 11 shows the details of the face of the LCD display. The printed circuit board or flex circuit carrying the electronic components for the tag 20 is concealed within the tag housing 311. The front wall of the housing forms a rectangular aperture for the LCD display, which includes four seven-segment characters 313. a decimal point 314, an eight-segment units identifier 315, and a "for" annunciator 316 for displaying prices for quantity purchases: an 18-chaτacter alpha-numeric display 317 (either 5 x 7 matrix or 14 segments) for product descriptions; and a zone 318 with a combination of characters to display cost per unit. A display driver such as FD2258f/FC2258A/FC2258K manufactured by Fuji Electric is used to translate the parallel data from the memory into the conventional drive signals for the LCD display. The display is shown to be of the LCD type, but LED's or other types of electronically controlled displays can be used. To seal the display window in the tag housing 311, a clear film may be bonded to the front of the tag housing to cover the display window. FIGS. 12 and 13 illustrate a preferred arrangement for mounting the display tags 20 on a conventional shelf 24 which includes a depending rail 22 formed as an integral part of the shelf. An auxiliary rail 320 is snapped into the shelf rail 22 and extends continuously along the full length of the shelf for receiving both the display tags 20 and the conductor C. The auxiliary rail 320 is designed so that the display tag 20 and the conductor C may be snapped into place anywhere along the length of the rail. The insulated conductor C is mounted in two channels 321 and 322 formed near the top and bottom of the rear wall of the rail 320. The tag is received in a channel formed in the front side of the rail 320. The tag is recessed inside, and held in place by, a pair of flanges 323 and 324 so that the tag does not protrude from the rail. The upper flange 323 is flared outwardly at a slight angle so that it can be bent upwardly and outwardly for installation and removal of tags from the front of the rail. A pair of rearwardly projection flanges 325 and 326 hold the rail 320 in place on the shelf rail 22. As shown in the cross-section of the tag 20 in FIG. 12, the pick-up coil 110 is wound around the periphery of the tag housing 311 in a channel 328 formed in all four edges of the housing. When the display tag is attached to the rail 320, the coil segments located in the top and bottom sections of the channel 328 are in close proximity to the two segments of the conductor C on the rear side of the rail 320. Thus, the coil is electromagnetically coupled to both segments of the conductor C. As shown in the perspective view of the tag of FIG. 13, a single conductor C is snapped into the top channel 321 of the rail 320. spans the length of the store shelf, and then loops to the bottom channel 322 of the rail 320 and spans the length of the shelf rail again. Alternate phasing of vertically adjacent shelves, as described above in connection with FIG. 4, minimizes cross talk between adjacent conductors along the shelves and avoids any significant radiation of signals from the entire system or susceptibility from other sources. FIG. 14 illustrates a display tag arrangement for products which are displayed on racks rather than shelves. This type of display rack is commonly used for products which are packaged in blister packages. The rack includes multiple rods 330, each of which supports multiple packages. A package can be removed from the rod by simply sliding the package off the forward end of the rod. In the arrangement of FIG. 14, a rail 320 is mounted directly above the rods 330, and contains a separate display tag 20 for each of the rods 330. The conductor C is fasten to the rear side of the rail 320 in the same manner described above in connection with FIGS. 12 and 13. FIG. 15 illustrates the use of the electronic display tag system of invention in a warehouse environment. Many warehouses contain numerous bins containing many different kinds of small articles which are difficult to identify from the markings on the articles themselves. FIG. 15 contains a diagrammatic illustration of four such bins 340. To identify the articles in the respective bins, a rail 320 is mounted directly beneath each row of bins, and contains a separate display tag for each bin. Again, the conductor C is mounted on the rear side of each of the rails 320. FIG. 16 depicts part of a retail store including a product information display system arranged according to a preferred embodiment of the present invention. Each area controller 31 supplies both power and control signals to its display tags 20 via a single main distribution loop and numerous branch distribution loops. As described above, the area controller 31 also monitors the display tags and receives signals generated by d e tags, such as service requests and acknowledgement signals. Each area controller 31 is contained in an enclosed housing which is mounted on one of the gondolas 30 on which the shelves are mounted. Although the gondolas 30 in FIGS. 16 and 17 are illustrated with only three shelves on each side, a gondola typically has about twelve shelves (six on each side), with an average of about six tags per shelf, or 72 tags per gondola. Thus, a single area controller can service 12 to 15 gondolas. The main distribution loop connected to each area controller 31 is formed by a series arrangement of two standard modules 422 and 423 (see FIG. 28). The first module 422 will be referred to herein as the "transfer module," and is simply a pair of parallel wires 424 and 425 encased in a dielectric strip 426 that can be easily attached to the top of a gondola 30. The dielectric surrounding each wire preferably has a thickness of about 0.015 to 0.020 inch to protect the system from electrostatic discharges. If desired, the flat side of the strip 426 may be coated with an adhesive 426a, protected until installation by a releasable backing, to facilitate application of the strip to the gondola. The dielectric strip 426 containing the two wires 424, 425 can be manufacmred in large quantities at a low cost by a conventional extrusion process. The distance between the wires 424, 425 is preferably minimized to reduce inductance. For example, when the wire is 18 AWG multi-strand wire, the center-to- center spacing of the wires may be 0.125 inch. As illustrated in FIG. 19. the mounting strip 426 is removed from a 2 to 3-inch length of both wires at both ends, and a quick connect 427 is crimped onto each exposed wire end. The second module 423 used to form the main distribution loop will be referred to herein as the "coupling module," and extends vertically along one end of each side of the gondola. Each coupling module 423 is a pair of parallel conductors 430 and 431 joined at the lower end to form a U-shaped segment of the main distribution loop. A single module 423 is used to distribute power and control signals to all the shelves on one side of a gondola. As in the case of the transfer module 422, the conductors 430, 431 in the coupling module 423 are encased in a dielectric strip 432 which covers the outside surface of each conductor 430, 431 with a dielectric thickness of at least 0.015 to 0.020 inch to protect the system from electrostatic discharges. To facilitate installation of the coupling module 423 in the 0.25-inch gap that normally exists behind the shelves on a gondola (see FIG. 20), the conductors 430, 431 are preferably in the form of thin flat strips of copper, e.g., 0.110 inch by 0.018 inch. These strips are contained in channels of a dielectric strip 432 having a total thickness of 0.0446 inch, and are held in place by a thin insulating plastic sheet 433 (FIG. 22) that is thermally bonded to the dielectric strip 432. A conductive cross bar 434 connects the two conductors 430, 431 at the lower end of the strip 432. At the upper end, the two conductors terminate in a configuration that mates with the quick connects 427 on the ends of the transfer module 422, so that the two modules 422 and 423 can be easily and quickly snapped together. In order to facilitate coupling of the conductors 430 and 431 to the branch distribution loops on the shelf rails, rectangular holes 435 are formed in the central web of the dielectric strip 432, at regular intervals along the length of the strip. As will be described in detail below, these holes 435 are used to receive a snap-on magnetic core module that couples the main and branch distribution loops. The center-to-center spacing of the holes 435 along the length of the strip is preferably the same as that of the shelf-mounting holes 436 in the shelf-support column 437 on the gondola (FIG. 24), so that a hole 435 will always be located close to the rear edge of a shelf, regardless of where the shelf is mounted on the gondola. The coupling modules 423 may be prefabricated in different lengths to match the dimensions of gondolas of varying heights. To facilitate alignment of the transfer and coupling modules 422 and 423 at the top of each gondola, and to enclose the connections between these two modules, the junction box 440 shown in FIGS. 24-28 is preferably used. This junction box 442 also aligns the holes 435 in the coupling module 423 with the shelf-mounting holes 436 in the gondola. This junction box 440 is formed in two parts 441 and 442, joined by a series of snap locks formed by depending clips 443 on the upper part 441 and mating holes 444 in the lower part 442. The upper ends of the coupling modules 423 are aligned by a pair of plugs 445 which fit through a corresponding pair of holes 446 in a pair of opposed vertical walls 447 and 448 of the junction box. The prongs on the inner ends of the plugs 445 fit into corresponding holes 449 (FIG. 24) near the upper ends of the coupling modules 423, thereby fixing the positions of the upper ends of the coupling modules both horizontally and vertically. The transfer module 422 on the top of the gondola is registered in a pair of notches 450 formed in the lower ends of a pair of guide legs 451 depending from opposite sides of the upper part 441 of the junction box. This registration ensures that the quick connects 427 on the end of the transfer module 422 will be conveniently located with respect to the upper ends of the conductors 430 and 431 in the coupling module 423. To position the junction box 440 itself, the lower part 442 has a depending alignment leg 452 which fits into the interior of the shelf-support column 437 of the gondola. The open top of this steel column 437 is normally closed with a plastic cap, which can be simply removed and replaced with the lower part 442 of the junction box. Thus the junction box 440 will always be precisely positioned with respect to the ends of the gondola shelves, whose positions are fixed by the steel column 437. Each shelf 24 has its own branch distribution loop, mounted on the rear side of an extruded plastic rail 460 that snaps onto the front of a standard shelf. FIGS. 29 and 30 illustrate a preferred arrangement for mounting the display tags 410 on a conventional shelf 412 which includes a depending rail 461 (FIG. 34) formed as an integral part of the shelf. The auxiliary rail 460 is snapped into the shelf rail 461 and extends continuously along the full length of a shelf 412 for receiving both the display tags 20 and the branch loop. The auxiliary rail 460 is designed so that the display tags 20 and a conductor 462 that forms the branch loop may be snapped into place on the rail. The insulated conductor 462 is mounted in two channels 463 and 464 formed near the top and bottom of the rear wall of the rail 460. The tags 20 are received in a channel 465 formed in the front side of the rail 460. The tags are recessed inside, and held in place by, a pair of flanges 466 and 467 so that the tags do not protrude from the rail. A curved rib 465a extends across a major portion of the space behind the upper flange 466 so as to form a spring element that can be deflected by pressing a tag upwardly behind the flange 466; the rib 465a then exerts a biasing pressure on the inserted tag to hold it in place on the rail 460. A hollow core 468 on the rear side of the rail 460 snaps into the open recess formed on the front of a standard shelf rail 461 to hold the rail 460 in place on the shelf rail 461. When a display tag 20 is attached to the rail 460, a pick-up coil on the tag is in close proximity to the two parallel runs of the conductor 462 on the rear side of the rail 460. Thus, the pick-up coil is electromagnetically coupled to both segments of the conductor 462. The conductor 462 is snapped into the top channel 463 of the rail 460, spans the length of the store shelf 24, and then loops to the bottom channel 464 of the rail 460 and spans the length of the shelf rail again. Alternate phasing of vertically adjacent shelves minimizes cross talk between adjacent conductors along the shelves and avoids any significant radiation of signals from the entire system or susceptibility from other sources. At the rail end adjacent the vertical coupling module 423, the conductor 462 is extended to form a U-shaped segment 470 that can be magnetically coupled to the module 423. As can be seen in FIGS. 30-33, the portion of the U-shaped extension 470 adjacent the end of the rail 460 is simply a side-by-side extension of the two runs of wire 462 mounted on the rail. This portion of the extension 470 is long enough to traverse the underside of the shelf, from the front edge to the rear edge, and may be provided with an adhesive coating on one side to facilitate attachment thereof to the underside of a shelf. At the lower end of the rear edge of the shelf, the two ends of the wire 462 are joined to two legs of a U-shaped flat conductor 471 enclosed in a thin, flat dielectric case 472. This flat conductor 471 is similar to the flat copper conductors 430, 431 in the coupling module 423, and the closed end portion 473 of the encased U-shaped conductor 471 has exactly the same width and thickness as the coupling module 423. It also has a rectangular hole 474, between the legs of the U, of exactly the same dimensions as the holes 435 in the coupling module 423. Accordion folds 475 are preferably formed near the open end of the U to permit the length of the U to be varied slightly to accommodate small variations in the distance between the rear edge of the shelf and the nearest hole 435 in the coupling module 423. To form a magnetic coupling between the branch and main distribution loops, the flat U-shaped portion 471 of the branch loop extension 470 is placed flat against the coupling module 423 with the rectangular holes 474, 435 in the two flat elements in exact register with each other. A two-piece magnetic core 480 is then clamped against opposite sides of the two flat elements, and fastened together by a hinged dielectric casing 481 attached to the two parts of the core. One part of the magnetic core 480 is an E-shaped piece 482 in which the middle arm 483 of the E is dimensioned to fit into and extend Through the registered rectangular holes in the two flat elements_473 and 423. The other two arms 484 and 485 of the E extend along the outside edges of the two flat elements. The second part of me magnetic core 480 is a straight piece 486 which closes the open side of the E when the two pieces 482 and 486 are brought together. The resulting core completely surrounds the two conductors in both flat elements 473 and 423, as can be seen in FIG. 38, and also fills the common central opening formed by the registered holes 474, 435 between e two pairs of conductors. Thus, current flow in either loop 470 or 423 will induce a corresponding current flow in the other loop through the magnetic coupling. The energy transfer through the magnetic coupling is highly efficient, e.g., as high as 95%. To hold the two pieces of the magnetic core togettier, with the two flat elements 473 and 423 sandwiched between the core pieces 482 and 486, the hinged dielectric case 481 for the core pieces includes a latch that snaps closed as the two core pieces are brought into engagement with each other. Specifically, a channel 487 with an inturned lip 488 formed on one free end of the housing flexes outwardly as it is forced past an angled lip 489 on the other free end of the housing. When the edges of the two lips 488 and 489 clear each other, the outer lip 488 snaps into the groove formed by the inner angled lip 489. This snap-action latch enables an installer to quickly and easily assemble the magnetic couplings that join the numerous branch loops to the various coupling modules 423 in the main loop. If the shelves are re-arranged at a later time, the core module can be easily unlatched, re-located, and re-latched. The two core pieces 482 and 486 are preferably pre-attached to their hinged case 481 by adhesive bonding so that the two core pieces and their case can be handled as a single part during assembly and dis-assembly of the magnetic coupling. The modular construction of this invention permits large display tag systems to be assembled from only a few different types of prefabricated modules. The principal modules are the transfer module and the coupling module that make up the main distribution loop, the rail module that includes a branch distribution loop, and the magnetic core module. The junction box is not part of the electrical system but is another repetitive module that facilitates assembly of the electrical modules. Mass production of this relatively small number of modules reduces the overall cost of the display tag system, and significantly shortens the time required for installation. Moreover, the resulting system is highly reliable and relatively maintenance-free because of the small number of electrical contacts subject to corrosion. The system is also largely immune from damage from electrostatic discharges because all vulnerable portions of the system are enclosed in protective casings. Finally, this system provides virtually unlimited flexibility for the owner to re-locate any desired section of the display or storage facility with only minimal additional work to disconnect and re-connect the display system.

Claims: CLAIMS: 1. A power and communication system for a product information display system associated with a product display or storage establishment having multiple product display or storage areas, comprising a plurality of electronic display tags mounted adjacent said product display or storage areas. an electrical power supply for supplying a-c. power to said display tags, multiple branch power distribution loops each of which extends along a selected group of said display tags for supplying power to those display tags, and a main power distribution loop connected to said power supply and magnetically coupled to said branch loops for supplying power to said branch loops. 2. The power and communication system of claim 1 wherein said tags include means for generating communication signals: said system includes a controller for transmitting communication signals to, and receiving communication signals from, said tags; and said main distribution loop is connected to said controller. 3. The power and communication system of claim 1 wherein each of said magnetic couplings includes a separate magnetic core. 4. The power and communication system of claim 1 wherein said display tags are mounted on a plurality of gondolas, and said main loop is formed in a series of segments each of which is mounted on a separate gondola, and including means for connecting and disconnecting said segments to permit rearrangement of the physical locations of said gondolas. 5. The power and communication system of claim 1 wherein each of said branch loops and the display tags associated therewith are mounted on a common rail with one end of the branch loop extending from one end of the rail in a predetermined configuration adapted to form part of a magnetic coupling to said main loop. 6. The power and communication system of claim 4 wherein said predetermined configuration is the same for multiple branch loops to enable the use of a common magnetic coupling method for all such branch loops. 7. The power and communication system of claim 4 wherein each of said magnetic couplings includes a two-part magnetic core that can be attached to said main loop and one of said branch loops to form a magnetic core surrounding adjacent segments of said one branch loop and said main loop, and a detachable housing for holding said core and adjacent loop segments together. 8. The power and communication system of claim 1 wherein said predetermined configuration of said one end of each branch loop is a first flat dielectric strip encasing the end of the loop, and said main loop includes a section encased in a second flat dielectric strip, said first and second dielectric strips forming mating openings for receiving a magnetic core for magnetically coupling the branch loop to the main loop. 9. The power and communication system of claim 7 which includes a two-part magnetic core and a dielectric case for enclosing said core and attaching the core to said first and second dielectric strips with the core extending through said mating openings. 10. The power and communication system of claim 8 wherein said dielectric core is a hinged case and the two parts of said core are attached to said case on opposite sides of the hinge so that the core can be clamped onto said dielectric strips by closing the case. 11. The power and communication system of claim 1 wherein said multiple product display or storage areas comprise multiple gondolas each containing multiple shelves with at least one of said second dielectric strips extending vertically along the ends of a plurality of said shelves at the rear edges of said shelves, with one of said rails extending horizontally along the front edge of each shelf, and with the extensions of said branch loops extending between the front and rear edges of the shelves for coupling the branch loops on the front edges of the shelves to the main loop segment in the vertical dielectric strip at the rear edges of the shelves. 12. A modular power and communication system for a product information display system associated with a product display or storage establishment having multiple product display or storage comprising a multiplicity of elongated pre-wired dielectric rails, each having a U-shaped branch power distribution loop mounted on one side thereof, and forming means for mounting a plurality of said display tags on the other side thereof, one end of said loop extending from one end of said rail in a predetermined configuration adapted to form part of a magnetic coupling to a main power distribution loop, a substantially flat dielectric strip containing a U-shaped segment of the main power distribution loop, said strip forming openings between the two legs of said U- shaped segment along the length of the strip for forming magnetic couplings between said segment and multiple branch power distribution loops on said dielectric rails, and a plurality of two-part magnetic cores shaped to fit through said openings in said dielectric strip, and a dielectric housing for securing the two parts of each magnetic core to adjoining segments of said branch loop and said main loop. 13. The modular system of claim 12 wherein said dielectric rails are mounted on shelves supported by columns having preformed holes for receiving the shelves, and said dielectric strip is mounted parallel to said columns with a predetermined relationship between the holes in said columns and the openings in said dielectric strip. 14. The modular system of claim 12 wherein said one end of said branch power distribution loop and said U-shaped segment of the main power distribution loop comprise flat conductive strips which can be placed face to face to form a magnetic coupling between the two loops. 15. The modular system of claim 14 wherein said flat conductive strips are enclosed in dielectric material of sufficient thickness to protect said loops from electrostatic discharges. 16. The modular system of claim 14 wherein each of said two-part magnetic cores is shaped to encircle the facing flat conductive strips of both loops to magnetically couple the two loops. 17. The modular system of claim 12 wherein said dielectric strip extends along the ends of a vertical bank of shelves each of which carries one of said dielectric rails. 18. The modular system of claim 17 wherein said main power distribution loop includes a second dielectric strip containing a pair of parallel conductors and extending along the length of each vertical bank of shelves carrying said dielectric rails, and including means for connecting the conductors in said second dielectric strip to said U-shaped segments of the main power distribution loop. 19. The modular system of claim 17 which includes a junction box for aligning adjacent ends of said second dielectric strip and said flat dielectric strip. 20. A shelf rail for receiving and holding shelf tags on the front edge of a shelf, said rail comprising an extruded plastic strip having a substantially flat front surface and forming a pair of integral channels along the top and bottom edges of the front surface for receiving the top and bottom edge portions of tags, the open sides of said channels facing each other, and a resilient rib formed as an integral part of said strip and extending from the rear inside wall of at least one of said channels toward the front inside wall of that same channel, so that a tag inserted into said channel and pressed upwardly against said rib will deflect the rib, after which the deflected rib will bias the tag into the opposed channel. 21. A product information display system associated with a product display or storage establishment having multiple product display or storage areas, comprising: a plurality of electronic display tags mounted adjacent said product display or storage areas; an electrical power supply for supplying a-c. power for a multiplicity of the display tags; multiple branch power distribution loops each of which extends along a selected group of said display tags for supplying power to those display tags; a main power distribution loop connected to said power supply and magnetically coupled to said branch loops for supplying power to said branch loops; a controller circuit for providing information signals for a multiplicity of the display tags; a modulator receiving the power signal and the information signals for modulating the power signal with the information signals; at least one electrical conductor connected to the modulator, and passing in close proximity to a multiplicity of the electronic display tags, for carrying the modulated power signal to the display tags; a pick-up coil in each display tag and inductively coupled to said conductor for receiving the modulated power signal; a demodulator within each display tag for demodulating the modulated power signal; and a display circuit within each display tag for generating a display in response to the information signals derived from the demodulated signal.

Inventors: FREDERICK W RICHARD, KAYSER KENNETH W, FREDERICK, W., RICHARD, KAYSER, KENNETH, W.
Applicants: KAYSER VENTURES LTD, KAYSER VENTURES, LTD.
Application year: 1995
Main classification: G09G5
IPC codes: G09F9, G09G3, H02J13