Indicator device

Abstract: An indicator device (14) having no moving parts includes a layered assembly (26) visible through an aperture (28) in a wall member (30), and a light source (38) positioned behind the layered assembly (26). The layered assembly (26) comprises a first transparent sheet (32) of a first colour, a second transparent sheet (34) of a second colour, and an LCD panel (36) interposed between the two sheets (32,34). The LCD panel (36) is adapted to be rendered transparent when energized and to be rendered opaque when de-energized. When the LCD panel (36) and the light source (38) are de-energized, the first colour (e.g. red) is seen through the aperture (28), and when the LCD panel (36) and the light source (38) are energized a third colour (e.g. green) is seen through the aperture (28). The indicator device (14) may be used, for example, as an in-service indicator of an ATM.

Description: This invention relates to an indicator device. The invention has application, for example, to an in-service indicator device incorporated in an automated teller machine (ATM), such device providing an indication as to whether or not an ATM is operational and available for use by a customer. A known in-service indicator device for use with an ATM takes the form of an electromagnetically operated mechanism including a flag having green and red portions. When the ATM is in service, power is applied to a solenoid actuator to position the green portion of the flag behind a slot in the fascia of the ATM so as to be visible therethrough. When the ATM is powered down or otherwise out of service, the actuator is de-energised as a result of which the red portion of the flag is moved behind the slot in place of the green portion. In common with other mechanisms having moving parts, the known indicator device referred to above has the disadvantage that there is a tendency for it to cease to operate reliably as a result of wear. For example, because of some part of the indicator mechanism sticking, the area of the flag visible through the indicator slot may be part green and part red. Document US-A-2137792 discloses an indicator device with no moving parts comprising a LCD (liquid crystal display) comprising a measuring device condition indicating portion having at least one shutter. The shutter defines a display window which is of a selected colour when the shutter defining the window is in an inactivated state. It is an object of the invention to provide an indicator device which is reliable in operation and has no moving parts. According to one aspect of the invention there is provided an indicator device characterized by a layered assembly visible through an aperture in a wall member, and a light source positioned behind said assembly, said assembly comprising a first transparent sheet-like member of a first colour positioned immediately behind said aperture, a second transparent sheet-like member of a second colour different from said first colour, and an energizable LCD panel interposed between said first and second transparent members, said LCD panel being adapted to be rendered transparent when energized and to be rendered opaque when de-energized, whereby when said LCD panel and said light source are de-energized said first colour is seen by light reflected by said de-energized LCD panel, and when said LCD panel and said light source are energized a third colour, different from said first and second colours, is seen by transmission of light from said light source passing through said assembly. According to another aspect of the invention there is provided a method for providing an indication, characterized by the steps of: providing a layered assembly visible through an aperture in a wall member, and a light source positioned behind said assembly, where said assembly comprises a first transparent sheet-like member of a first colour positioned immediately behind said aperture, a second transparent sheet-like member of a second colour different from said first colour, and an energizable LCD panel interposed between said first and second transparent members; and energizing said LCD panel so that it is adapted to be rendered transparent, and de-energizing said LCD panel so that it is rendered opaque, whereby when said LCD panel and said light source are de-energized said first colour is seen by light reflected by said de-energized LCD panel, and when said LCD panel and said light source are energized a third colour, different from said first and second colours, is seen by transmission of light from said light source passing through said assembly. It will be appreciated that when an indicator device in accordance with the invention is used as an in-service indicator of a machine such as an ATM, the indicator displays one colour, e.g. a shade of green, when the machine is available for use, and displays a second colour, e.g. a shade of red, when the machine is out of service, for example when no power is applied to the machine. One embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:- Fig.1 is a front view of the fascia (user interface) of a through-the-wall ATM having an in-service indicator device in accordance with the invention; and Fig.2 is an enlarged, part-sectional, side view of the indicator device. Referring to the drawings, the ATM fascia 10 shown in Fig.1 is mounted in a wall 12 of a bank or other institution. The fascia 10 conventionally includes an in-service indicator 14, a display screen 16 by means of which information and instructions may be displayed to a user of the ATM, a card entry slot 18 through which a user identifying card may be entered in the machine, a key panel and other keys 20 by means of which a user may enter identifying information and instructions into the machine, a currency present slot 22 through which a requested amount of currency notes may be presented to a user, and a receipt slot 24 through which printed receipts and statements may be issued to a user. Referring now additionally to Fig.2, the in-service indicator 14 includes a layered assembly 26 mounted immediately behind a horizontally extending slot 28 formed in a wall member 30 of the fascia 10, the slot typically having a horizontal dimension of 8 centimetres and a vertical dimension of 2.5 centimetres. The assembly 26 has a size slightly greater than that of the slot 28 and is secured to that part of the inner surface of the wall member 30 surrounding the slot 28, for example by means of an adhesive. The assembly 26 comprises a first transparent plastic sheet 32 which is a shade of red in colour, a second transparent sheet 34 which is a shade of blue in colour, and a rigid liquid crystal display (LCD) panel 36 interposed between the sheets 32 and 34. The red coloured sheet is positioned immediately behind the slot 28 as shown in Fig.2. The sheets 32 and 34 are respectively attached to the opposed main faces of the LCD panel 36 by means of an adhesive applied around the edges of the sheets 32, 34 and the panel 36 so as to form a compact rigid assembly. In known manner, the LCD panel 36 comprises an array of LCD elements and has a form of construction and mode of operation such that when the panel 36 is appropriately energized the whole of the panel 36 is rendered effectively transparent, and that when the panel 36 is de-energized it is rendered opaque. When rendered opaque, the panel 36 appears light grey in colour. An LED light source 38 is mounted behind the assembly 26 so that when energized it emits light towards the assembly 26 and slot 28. Preferably, the light source 38 is arranged to emit green light. When the ATM is in service, i.e. is available for use by a customer of the institution in whose premises the ATM is installed, the light source 38 is energized and the LCD panel 36 is appropriately energized so as to render the panel 36 transparent. Thus, light from the light source 38 is transmitted through the blue coloured sheet 34, the panel 36 and the red coloured sheet 32 and thence through the slot 28. By virtue of the passage of the light through the coloured sheets 34,32, and by virtue of arranging these sheets 34,32 to be appropriate shades of blue and red, the assembly 26 as viewed by a customer through the slot 28 will appear to be a shade of green. When the ATM is out of service for any reason, for example as a result of a breakdown in the power supply to the ATM or for some other reason not involving a breakdown in the power supply, then the light source 38 and the panel 36 are both de-energized. As a result, the assembly 26 as viewed by a customer through the slot 28 will now appear to be a shade of red, i.e. the colour of the sheet 32, where light is reflected by the de-energized LCD panel 36. It will be appreciated that since the panel 36 is opaque when the ATM is out of service the colour of the sheet 34 will have no effect on the appearance of the assembly 26 as viewed by a customer through the slot 28. Also, the light grey appearance of the panel 36 when it is opaque has no significant effect on the colour of the assembly 26 as seen by a customer. If desired, the light source 38 can be arranged to remain energized when the ATM is out of service for some reason other than absence of power, since the opaque panel 36 will prevent light from the light source 38 reaching the slot 28. The indicator 14 described above has the advantages that it has no moving parts, that it provides an effective out-of-service indication regardless of whether or not there is an absence of power, and that it has a very low power consumption. Thus, the indicator 14 has a power consumption of only a few milliwatts compared with a typical power consumption of approximately 24 watts for a known solenoid operated indicator.

Claims: An indicator device (14) comprising a layered assembly (26) visible through an aperture (28) in a wall member (30), characterized by a light source (38) positioned behind said assembly, said assembly (26) comprising a first transparent sheet-like member (32) of a first colour positioned immediately behind said aperture, a second transparent sheet-like member (34) of a second colour different from said first colour, and an energizable LCD panel (36) interposed between said first and second transparent members, said LCD panel being adapted to be rendered transparent when energized and to be rendered opaque when de-energized, whereby when said LCD panel (36) and said light source (38) are de-energized said first colour is seen by light reflected by said de-energized LCD panel and when said LCD panel and said light source are energized a third colour, different from said first and second colours, is seen by transmission of light from said light source passing through said assembly (26). An indicator device according to claim 1, characterized in that said first colour is a shade of red and said third colour is a shade of green. An indicator device according to claim 2, characterized in that said second colour is a shade of blue. An indicator device according to claim 2 or 3, characterized in that the colour of the light emitted by said light source (38) when energized is a shade of green. An indicator device according to any one of the preceding claims, characterized in that said light source (38) is an LED device. An indicator device according to any one of the preceding claims, characterized in that said first and second transparent members (32,34) are respectively attached to the main faces of said LCD panel (36). An indicator device according to claim 6, characterized in that said first and second transparent members (32,34) are each in the form of a plastic sheet. An indicator device according to any one of the preceding claims, characterized in that said LCD panel (36) appears grey in colour when de-energized. An ATM including an in-service indicator device (14) in accordance with any one of the preceding claims. A method for providing an indication, comprising the step of : providing a layered assembly (26) visible through an aperture (28) in a wall member (30), characterized by the steps of: providing a light source (38) positioned behind said assembly, where said assembly (26) comprises a first transparent sheet-like member (32) of a first colour positioned immediately behind said aperture, a second transparent sheet-like member (34) of a second colour different from said first colour, and an energizable LCD panel (36) interposed between said first and second transparent members; and energizing said LCD panel so that it is adapted to be rendered transparent, and de-energizing said LCD panel so that it is rendered opaque, whereby when said LCD panel (36) and said light source (38) are de-energized said first colour is seen by light reflected by said de-energized LCD panel, and when said LCD panel and said light source are energized a third colour, different from said first and second colours, is seen by transmission of light from said light source passing through said assembly (26).

Inventors: SHARP GORDON D, SHARP, GORDON D.
Applicants: NCR INT INC, NCR INTERNATIONAL INC.
Application year: 1996
Main classification: G07F7
IPC codes: G07F9, G07F19, G09F9, G02F1