EP0481327A1 - Dispositif d'affichage pour une pompe à essence - Google Patents

Dispositif d'affichage pour une pompe à essence Download PDF

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Publication number
EP0481327A1
EP0481327A1 EP91117089A EP91117089A EP0481327A1 EP 0481327 A1 EP0481327 A1 EP 0481327A1 EP 91117089 A EP91117089 A EP 91117089A EP 91117089 A EP91117089 A EP 91117089A EP 0481327 A1 EP0481327 A1 EP 0481327A1
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
displays
light source
light
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91117089A
Other languages
German (de)
English (en)
Other versions
EP0481327B1 (fr
Inventor
Felix Ing. grad. Müller
Wilhelm Ulrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
Mannesmann Kienzle GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann VDO AG, Mannesmann Kienzle GmbH filed Critical Mannesmann VDO AG
Publication of EP0481327A1 publication Critical patent/EP0481327A1/fr
Application granted granted Critical
Publication of EP0481327B1 publication Critical patent/EP0481327B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals

Definitions

  • the invention relates to a petrol pump display device for the simultaneous display of a fuel delivery of an amount to be paid and a base price per unit of quantity delivered with multi-digit, three-row rows of digits consisting of transflective liquid crystal displays (LCD) and one arranged behind the display elements Light source.
  • LCD liquid crystal displays
  • Liquid crystal displays Liquid Crystal Display
  • the display technology has progressed to such an extent that such components have also found their way into the field of application of petrol stations.
  • a standard for the display geometry has developed almost worldwide, which looks so that, for example, the information for an amount, a quantity and a base price per unit of measure are displayed in three multi-digit lines.
  • the reading angle has been significantly improved
  • the temperature response has been expanded, and reliability and service life have thus been increased.
  • the LC displays turned out to be very suitable for use in displays in rough service station operation.
  • the LC display developed into an inexpensive display element with low power consumption and easy to control. It turned out to be a serious disadvantage, especially when used at petrol stations - since LC displays are so-called passive displays - that the readability was insufficient or even bad in the immediate vicinity due to insufficient lighting conditions. Bad ambient light conditions result from the large roofing of the petrol pump areas alone. In such cases, the ceiling lights usually installed are also not suitable for sufficiently illuminating the reading area of the LC displays.
  • the second possibility of a high-contrast display results from the use of so-called transflective display elements with translucent lighting arranged on the back.
  • the reflective LC displays have so far hardly been able to prevail for use in the dispenser area.
  • the reason for this was the relatively large effort and an additional space requirement, which is not accepted by the users.
  • the aim is that display elements plus lighting be designed as a compact display device and as such can be installed and operated in practically any standard petrol pump.
  • Lighting devices for transflective LC displays are known which essentially consist of light systems with incandescent or halogen lamps or with light-emitting diodes and are mostly combined with complex optical light distribution devices. Such arrangements are quite useful for indoor applications; However, they have not proven themselves against the requirements in the rough operation of the petrol pumps, where they are exposed to extreme climatic influences and therefore have an extremely limited service life. Replacing the lighting elements in the known lighting systems is complex and often only feasible by trained personnel.
  • the lighting systems used for individual displays are never designed with a high degree of luminance in order to keep within certain limits greater expenditure for energy supply from the power supply unit and any heat radiation that may occur.
  • the object of the invention is to provide a lighting device for an LC display device of the type described at the outset that meets the requirements of the petrol pumps with simple means and economically justifiable effort and taking into account the previous display geometry and installation method.
  • a printed circuit board which, according to the arrangement and size of the liquid crystal displays, has area-like recesses for the passage of light generated in the background by a central light source and from backward incident light that an inhomogeneous diffusing screen is provided between the light source and the liquid crystal display panels, so that background light of uniform intensity is incident on all liquid crystal display panels.
  • a single fluorescent tube for three LC displays represents only a small load on the power supply unit compared to the otherwise usual arrangement of three separate lighting elements for the three display panels of a display device and is therefore far less expensive to implement.
  • the arrangement of cutouts in the size of the liquid crystal elements means that the light from the backward incidence can be adjusted in the required illuminance for each area in such a way that uniform contrast is formed on all three display lines.
  • an inhomogeneous optical lens is used between the light source and the LC display panels, which allows the light from the only light source to strike the back of the LC display panels with absolutely uniform intensity. This can be achieved by determining the actually existing lighting conditions by means of a photographic recording process and quasi transferring the result of the inhomogeneous black coloring on the negative film to a so-called diffusing screen using a screen printing process.
  • This procedure results in a screen printing density on the diffusing screen, which, measured by the illuminance behind the three LC display panels, allows a correspondingly adjusted, uniform luminous intensity to strike the LC displays through the diffusing screen. Due to the background light of the same intensity that can be achieved with the diffusing screen, the contrast formation with regard to the representation of the activated characters is consistently the same on all three display panels. As a result, an optimal display image can be set with the backlight setting according to the invention.
  • the type of arrangement of LC elements, lens and light source allows a densely packed and therefore extremely flat design, so that the display device can be used while maintaining all previous dispenser housing shapes and is interchangeable with all previous, non-illuminated display devices.
  • FIG. 1 shows a front view of a fuel dispenser display device as it is arranged according to the arrangement of three among one another inserted display lines as the standard display.
  • Each display line consists of a multi-digit, separate liquid crystal display panel or LCD 2, 3, 4, and each line is assigned a meaning assigned to it by a corresponding imprint on a housing cover plate 13.
  • Three windows 14, 15, 16 provided in the cover plate 13 provide a clear view of the display elements using transflective LC technology, the seven bars being shown in a seven-segment arrangement due to the inventive construction of the backlight after activation with very good contrast and are easy to read regardless of the ambient light.
  • a number consisting of five digits can be activated during a fuel withdrawal process for the indication of an amount 18 (e.g.
  • the information in window 16 relates to a basic price per unit of quantity of the fuel type selected in each case.
  • the positioning of the commas 17 can be set at the intended location via a key module (not shown in detail) at the start of the start-up.
  • the display element for a base price 20 consists of four digits with a comma 17 marking the pfennig and 1/10 pfennig units.
  • the three transflective LCD panels 2, 3, 4 are mounted on a printed circuit board 1 as a carrier element, which is accommodated on fastening pillars 11 in a trough-shaped housing 5.
  • a printed circuit board 1 Corresponding to the arrangement and size of the liquid crystal displays 2, 3, 4, area-like recesses 21, 22, 23 are provided in the printed circuit board 1, which are generated by backwards onto the liquid crystal display panels 2, 3 by a central light source 6 in the background of the housing 5 , 4 let incident light through.
  • the central light source 6 is arranged behind the central liquid crystal display panel 3 and consists of a commercially available fluorescent tube 24, which in turn is mounted on a carrier plate 7.
  • the complete lighting unit consisting of fluorescent tube 24 and support plate 7 is arranged for assembly or replacement of the fluorescent tube 24 through a cutout 25 in the bottom of the housing 5 and can be removed and secured with screws 26 or a clamp lock.
  • the housing inner wall 5/1 is designed with a light-reflecting color layer 27, which serves to intensify the illumination.
  • a light-distributing diffuser 9 is inserted between the light source 6 and the printed circuit board 1 and is arranged as spatially as possible behind the LCD panels 2, 3, 4.
  • the diffusing screen 9 is held in four tabs 10 stamped out of the housing 5 and is fixed in the installed position by the fastening pillars 11.
  • the diffusing screen 9 can be a transparent, correspondingly colored glass or plastic pane, which ultimately serves for a light distribution explained below.
  • the aim in the example shown must be to convert the beam path of a rod-shaped light source 6 into a homogeneous background light behind the LCD panels 2, 3, 4 by the action of the diffusing screen 9.
  • the panel 3 in the immediate vicinity of the light source 6 is the most illuminated display field.
  • a negative image of the illuminated areas is taken using a photographic process, so that one can literally get an exact "light image” related to the light distribution including all possible shading receives.
  • the light or brightness structure that can be achieved in this way in the form of an image is converted into a printing screen by means of a graphic process, whereby very narrow meshes are obtained for the strongly exposed areas and gradually widened meshes for the less exposed areas.
  • Fig. 3 an attempt is made to represent the density of the screen printing by a schematic representation of lines 29.
  • a screen print 12 overlay with a higher density represented by more and thicker lines
  • an increasing distance from the light source 9 with fewer and thinner lines
  • screen print 12 edition of different density is applied to a transparent glass or plastic pane 28, and this results in a diffuser 9, which due to the different screen print density fades out excess or uneven brightness, so that from the Diffuser 9 emerging illuminance of homogeneous brightness and as background light, the three transflective LCD panels 2, 3, 4 be absolutely even shines.
  • a single diffuser 9 with correspondingly applied screen printing zones can be produced for all three LC displays; on the other hand, it is also possible to produce individual smaller diffusing disks 9, each of which is provided with an adapted screen printing pad in accordance with its assignment to one of the three LC displays 2, 3 or 4 in adaptation to the lighting state present there.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Reciprocating Pumps (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
EP91117089A 1990-10-15 1991-10-08 Dispositif d'affichage pour une pompe à essence Expired - Lifetime EP0481327B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4032679A DE4032679A1 (de) 1990-10-15 1990-10-15 Zapfsaeulen-anzeigevorrichtung
DE4032679 1990-10-15

Publications (2)

Publication Number Publication Date
EP0481327A1 true EP0481327A1 (fr) 1992-04-22
EP0481327B1 EP0481327B1 (fr) 1996-04-03

Family

ID=6416314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117089A Expired - Lifetime EP0481327B1 (fr) 1990-10-15 1991-10-08 Dispositif d'affichage pour une pompe à essence

Country Status (3)

Country Link
EP (1) EP0481327B1 (fr)
AT (1) ATE136389T1 (fr)
DE (2) DE4032679A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2063312A1 (fr) 2007-11-22 2009-05-27 Achim Hannemann Unité d'affichage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19909158B4 (de) * 1999-03-02 2005-12-01 Siemens Ag Anzeige mit zwei Anzeigefeldern
DE102004031115A1 (de) * 2004-06-28 2006-01-19 Attrack Gmbh Anzeigesystem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410949A (en) * 1980-09-09 1983-10-18 Unidynamics/St. Louis, Inc. Controller for fuel dispenser
EP0363700A2 (fr) * 1988-10-11 1990-04-18 Lic-Langmatz Gmbh Dispositif d'affichage lumineux
EP0374085A2 (fr) * 1988-12-16 1990-06-20 KRONE Aktiengesellschaft Dispositif d'affichage électro-optique plat, en particulier tableau d'affichage LCD

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410949A (en) * 1980-09-09 1983-10-18 Unidynamics/St. Louis, Inc. Controller for fuel dispenser
EP0363700A2 (fr) * 1988-10-11 1990-04-18 Lic-Langmatz Gmbh Dispositif d'affichage lumineux
EP0374085A2 (fr) * 1988-12-16 1990-06-20 KRONE Aktiengesellschaft Dispositif d'affichage électro-optique plat, en particulier tableau d'affichage LCD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2063312A1 (fr) 2007-11-22 2009-05-27 Achim Hannemann Unité d'affichage

Also Published As

Publication number Publication date
EP0481327B1 (fr) 1996-04-03
DE4032679A1 (de) 1992-04-16
ATE136389T1 (de) 1996-04-15
DE59107647D1 (de) 1996-05-09

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