WO2000062274A1 - Dispositif d'affichage electromagnetique - Google Patents

Dispositif d'affichage electromagnetique Download PDF

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Publication number
WO2000062274A1
WO2000062274A1 PCT/DE1999/001102 DE9901102W WO0062274A1 WO 2000062274 A1 WO2000062274 A1 WO 2000062274A1 DE 9901102 W DE9901102 W DE 9901102W WO 0062274 A1 WO0062274 A1 WO 0062274A1
Authority
WO
WIPO (PCT)
Prior art keywords
display device
plate
pixel
tilting flap
tilting
Prior art date
Application number
PCT/DE1999/001102
Other languages
German (de)
English (en)
Inventor
Helmut Fischer
Wolfgang KÖGLER
Rudolf Pongratz
Original Assignee
Annax Anzeigensysteme 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
Priority to DE29824339U priority Critical patent/DE29824339U1/de
Priority to DE19802218A priority patent/DE19802218B4/de
Priority claimed from DE19802218A external-priority patent/DE19802218B4/de
Application filed by Annax Anzeigensysteme Gmbh filed Critical Annax Anzeigensysteme Gmbh
Priority to ES99927654T priority patent/ES2230859T3/es
Priority to CA002352821A priority patent/CA2352821C/fr
Priority to EP99927654A priority patent/EP1171860B1/fr
Priority to DE59910607T priority patent/DE59910607D1/de
Priority to PCT/DE1999/001102 priority patent/WO2000062274A1/fr
Priority to AT99927654T priority patent/ATE277399T1/de
Priority to US09/856,444 priority patent/US6603458B1/en
Publication of WO2000062274A1 publication Critical patent/WO2000062274A1/fr

Links

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
    • G09F9/37—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 movable elements
    • G09F9/375—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 movable elements the position of the elements being controlled by the application of a magnetic field

Definitions

  • the invention relates to an electromagnetic display device consisting of a plate with a number of two, essentially square pixels, each of which is provided with a rotatable, bistable tilting flap which is asymmetrical with respect to its axis of rotation and which is in each of its two stable positions covers one of the two parts of the plate surfaces in the area of the pixel, the side of the tilting flap facing the front of the plate and the part of the plate in the area of the pixel covered by the tilting flap in this position having a first color and the other side of the tilting flap and the other part of the plate in the area of the pixel are colored with a second color, a permanent magnet is attached to the tilting flap in the vicinity of the axis of rotation, and the movement of the tilting flap from a first position to a second position by one assigned to the pixel, at which Rear of the plate arranged, a bobbin with coil Head and coil foot as well as a core with electro-magnetic.
  • Such electromagnetic display devices are used to build up display boards in which the information displayed can be changed in a simple manner, that is to say exchanged or adapted.
  • the display panel consists of a large number of individual pixels arranged in a matrix, the pixels that are electromagnetically located between them let two different states switch back and forth so that they appear, for example, in a light or dark color. Any letters, numbers or other characters can be put together from these pixels, whereby a matrix of seven lines with five pixels each is sufficient to represent most characters.
  • a generic electromagnetic display device is known from the patents DE 35 01 912 C2 and DE 36 01 018 C2, which consists of a matrix of square pixels arranged on a plate, each of which has a bistable tilting flap in the form of a bistable tilting flap rotatably mounted in two bearing blocks a right-angled triangle, the axis of rotation coinciding with the hypothesis of the triangle.
  • the tilt flap covers half of the part of the plate belonging to the square pixel, the respectively visible parts of the plate and tilt flap being uniform and different for both positions of the tilt flap, for example colored black and white.
  • Switching between the two display states of the pixel takes place via an electromagnet arranged below the pixel, which is composed of a coil former and a pin-shaped core and which toggles the flap flap equipped with a permanent magnet when an appropriate voltage is applied between the two layers.
  • This structure of the individual pixels enables an almost complete, almost space-free utilization of the advertising space by the pixels, which are only due to the recesses required in the area of the pedestals is somewhat impaired.
  • This good area filling results in good legibility of the letters, numbers and other characters represented by the display device, provided that this is sufficiently illuminated by daylight or artificial light. In poorly lit places or in the dark, however, this type of display device can only be used in conjunction with an additional light source that illuminates its front.
  • Document EP 0 401 980 B1 describes a display device which can also be read in the dark, the individual pixels of which each consist of a circular disk with a radial slot which is rotatably mounted about an axis of rotation running perpendicular to the slot on the diameter of the circular disk.
  • the circular disc can be rotated by an adjacent permanent magnet on the axis of rotation and an electromagnet located behind it through an angle of approximately 180 ° between two stops, whereby the viewer in one position faces the bright front of the circular disc and the end of a light guide arranged behind it is visible in the slot, while in the other position the dark side of the circular disc faces forward and covers the light guide.
  • the latter display devices have the advantage of being able to be operated and read even in the dark.
  • the parts of the pixels used for the display are circular and are spaced apart from one another due to the electromagnetic drive device arranged next to the circular disk, which overall results in a comparatively small area filling and thus an impairment of the readability of these display devices.
  • the panes in the case of pixels formed in a course are not parallel to the display plane, at least in one of their switching states, so that the image point appears different when viewed from different directions.
  • a particular disadvantage of pixels formed from circular disks is that the light source is usually somewhat behind the
  • Disk is arranged, which leads to partial shadowing of the emitted light and the lateral readability of corresponding display devices deteriorates significantly.
  • the present invention has set itself the task of creating an electromagnetic display device that As well as in the dark, the information displayed can be easily read.
  • the display device has a carrier, the coil base of the electromagnet is inserted into the carrier, the coil head is attached to the plate, each pixel is provided with an opening in the plate and each pixel is arranged on the carrier , is assigned in the direction of the opening facing base on which a light emitting diode is mounted.
  • the present invention is based on the idea of forming the electromagnetic display device with pixels which are easy to read in daylight, and which have bistable tilt flaps between two colors, for example a bright one such as white or yellow, which can be formed with a reflective film, and one dark ones, such as black, can be switched back and forth, and each pixel is to be provided with at least one light-emitting diode (LED), which is preferably arranged in the bright area and which supports the readability of the display device when the lighting diminishes and also ensures good readability even in the dark.
  • LED light-emitting diode
  • the electromagnetic display device is to be equipped with square pixels which can be switched between two colors, preferably a light and a dark one, with bistable tilting flaps which, depending on the switching state, occupy one of two possible positions on the pixel.
  • the tilting flaps To move the tilting flaps, they are close to their axes of rotation equipped with a permanent magnet which, depending on the position of the tilting flap, points either with its north or with its south pole in the direction of the electromagnet arranged on the back of the plate and assigned to the respective pixel, which consists of a coil former and a pin-shaped core inserted into the coil former composed of magnetically soft or remanent material.
  • a retentive core has the advantage that a magnetization of the core is sufficient to initiate a switching process, and the current pulse on the coil can therefore be considerably shorter than the actual switching process of the tilting flap.
  • the magnetization of the retentive core ensures that the tilting flap is held securely in the position once it has been set.
  • the back of each pixel is equipped with a light-emitting diode which shines through an opening preferably made in the bright area of the pixel.
  • the light emitting diode can be operated with such a low current that its service life is practically unlimited.
  • a carrier arranged behind the plate serves to hold electromagnets and light-emitting diodes in defined positions and intervals that correspond to the grid dimension of the pixels.
  • the coil feet are inserted in the carrier and this is equipped with bases in the direction of the openings in the pixels, which receive the light-emitting diodes and in this way a uniform distance from the openings ensure in the individual pixels, which overall results in good readability of the display device in the dark.
  • a particularly simple and therefore preferred rotatable mounting of the tilting flaps is obtained by integrally forming corresponding bearing blocks on the plate, which receive bearing journals located at the ends of the axis of rotation of the tilting flap.
  • the tilt flap In its two stable positions, the tilt flap should cover half of the square pixel. This can be achieved, for example, by a tilting flap in the form of a rectangle, in which the axis of rotation runs through one of the long sides of the rectangle. A more favorable weight distribution with respect to the axis of rotation and thus a lower moment of inertia is obtained, however, by designing the tilting flap in the form of a right-angled isosceles triangle, in which the axis of rotation coincides with the hypotenuse of the triangle. Higher switching speeds and the possibility of a 90 "rotation of the display without changing its physical properties are the advantages of this design of the tilting flaps. For a good surface filling of the display panel, the corners of the tilting flaps adjacent to the axis of rotation, and possibly also other corners, with recesses for receiving the bearing blocks be provided.
  • the permanent magnet required for the movement of the tilting flaps can be glued to the tilting flap in the vicinity of the axis of rotation his. In a further development of the invention, it is inserted into a pocket placed in the tilting flap and then closed, for example glued or welded. In this way, the permanent magnet is safely protected against harmful environmental influences and runs no risk of corroding, falling or shifting.
  • the electromagnet is attached to the plate and carrier via releasable snap connections which can be formed in the recesses of the plate and carrier using the elasticity of the material and in which the coil head and coil base snap into place.
  • the carrier of the display device is preferably designed such that the coil base of the electromagnet can be inserted and latched into the carrier in the radial direction from the side, a bead on the carrier engaging in a groove on the coil base fixing the electromagnet against axial displacement.
  • One advantage of this construction of the display device is that it is facilitated by an automatic machine that can simply insert the electromagnets in the radial direction, while the light-emitting diodes have to be inserted axially. Since the light-emitting diodes are released by the tilting flap in one position and covered in the other, the display device according to the invention can readily be illuminated permanently
  • the light-emitting diodes of the individual pixels be peeled in such a way that they are switched on and off with the movements of the associated tilting flap, i.e. only light up when they are released by the associated tilting flap.
  • a large aperture angle of the light emitted by the individual pixels is desirable for good readability of the display device according to the invention in the dark.
  • the height of the base arranged on the carrier for the light-emitting diodes of the individual pixels is selected so that the upper end of the light-emitting diode is flush with the front of the plate, that is to say it is in one plane with the front of the plate, thereby shadowing the light-emitting diode emitted light is minimized through the side walls of the opening without affecting the movement of the tilt flaps.
  • This flush installation of the light-emitting diode results in a large reading angle, which enables the image point to be detected quickly by the eye.
  • the individual pixels are equipped with a transparent front pane which is illuminated from the rear by the light-emitting diode associated with the pixel and as a diffusing screen the passing light is scattered.
  • a transparent front pane which is illuminated from the rear by the light-emitting diode associated with the pixel and as a diffusing screen the passing light is scattered.
  • both parts of each pixel are each equipped with one or more light-emitting diodes, expediently different light-emitting diodes are used on both pixel parts, the color of which is adapted to the respective coloring of the assigned parts of the pixels.
  • display devices can be created which can display colored characters against a different colored background even in the dark and are therefore outstandingly suitable for information and advertising purposes.
  • the individual pixels can be arranged on the plate in the form of a matrix which can contain, for example, seven lines with five pixels each, that is to say a total of 35 pixels, with which numbers, letters and other characters can be represented.
  • a large number of such display devices can then be used to construct display boards for displaying many characters, the size of which can be flexibly adapted to the needs depending on the intended use of the use board. It is also conceivable to replace the matrix-like arrangement of the pixels to select a stripe-shaped arrangement of the plate, the stripes arranged in columns or stripes likewise giving a matrix for displaying numbers, letters and characters.
  • the invention provides for the bearing block of a tilting flap to be arranged so far outwards that they partially protrude beyond the square pixel area and are arranged together with the bearing block of the respective neighboring pixel in the region of the cutouts made at the corners of the square pixels .
  • the invention recommends to provide the edges of each plate in the area of the bearing blocks with recesses which can accommodate the protruding bearing blocks of the adjacent plate. This way you get a defined arrangement of the pixels of adjacent plates with very small gaps, which benefits the use of space and on the display board and the legibility of the information displayed.
  • the field distribution of the magnetic field generated by the electromagnet can be influenced by the exact shape of the pin-shaped coil core.
  • a high field strength and thus a bundling of the field lines in the area of the permanent magnet above the coil head is desirable for a quick and reliable folding over of the tilting flaps.
  • the invention recommends extending the coil core in the axial direction through the coil foot, which increases the bundling of the field lines on the coil head in the desired manner and at the same time reduces unwanted stray fields in the area of the adjacent coils.
  • the lower ends of the coil cores can be inserted through holes in the circuit board to which the electrical connections of LEDs and electromagnets for power supply are soldered. This results in a guide which facilitates the assembly of the printed circuit board and an increased mechanical stability of the entire arrangement.
  • FIG. 1 is a side view of a pixel of a display device according to the invention, which is partially drawn in a sectional view.
  • FIG. 1 shows a top view of an electromagnetic display device according to the invention, which consists of 5 pixels arranged on a strip.
  • Each of the pixels has an essentially square shape with cutouts at the four corners and is divided in two along its diagonals, each part being covered by a tilting flap (1).
  • the tilt flaps (1) have the shape of right-angled isosceles triangles with cutouts at the corners, the hypotenuse (2) of the triangles coinciding with the axis of rotation of the tilt flap.
  • bearing pins (3) are arranged, with which the tilting flap is rotatably mounted in bearing blocks (4).
  • the plate (5) is provided with an opening through which a light-emitting diode (6) can be seen.
  • the tilting flap (1) is shown in a position in which it covers the light-emitting diode (6).
  • the side of the tilting flap (1) pointing upwards and the visible part of the part of the plate (5) belonging to the pixel are colored in a shaded shade shown here.
  • the other four shown in the drawing The pixels in contrast are in the other possible switching state, in which the tilt flap assumes a position in which the pixel appears in a light color and the light-emitting diode (6) can be seen.
  • the plate (5) is provided on its sides with recesses (8) adjoining the pedestals (4), which enable several lines of the electromagnetic display device according to the invention to be placed in a defined position without a space between the pixels and thus, for example, a matrix to form seven such lines with which letters, numbers and other characters can be easily represented.
  • FIG. 2 shows a side view of a pixel of the display device according to the invention, partially drawn in a sectional view.
  • An electromagnet is arranged below the center of the pixel and consists of a coil body (9) with a coil head (11) arranged above and a coil base (12) arranged below and a pin-shaped core (10) made of remanent material. Coil head (11) and coil foot (12) engage in recesses in plate (5) and carrier (16) where they are snapped into detachable snap connections.
  • To facilitate the exchange of the plate (5) only two of the pixels, for example the second and the fourth, are included
  • they and the electrical connections (15) of the electromagnet are soldered onto a circuit board, which also receives the lower end of the pin-shaped core (10) in a bore, thereby reliably fixing the position of the pixel on the circuit board.
  • an electromagnetic display device which is characterized by a high area filling and is equally well recognizable and readable day and night.

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  • 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)
  • Led Device Packages (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

L'invention concerne un dispositif d'affichage électromagnétique comprenant un panneau qui comporte un certain nombre de pixels sensiblement carrés, en deux parties, pourvus chacun d'un volet basculant monté de manière rotative, bistable et asymétrique par rapport à son axe de rotation, ledit volet recouvrant, dans chacune de ses deux positions stables, une des deux parties des surfaces de panneau dans la zone du pixel. La face du volet basculant, orientée vers la face avant du panneau et la partie du panneau, recouverte dans cette position par le volet basculant, sont colorées avec une première couleur dans la zone du pixel, et l'autre face du volet basculant ainsi que l'autre partie du panneau dans la zone du pixel sont colorées avec une deuxième couleur. Un aimant permanent est placé à proximité de l'axe de rotation sur chaque volet basculant. Le déplacement du volet basculant pour passer d'une première position à une deuxième position s'effectue par l'intermédiaire d'un électro-aimant associé au pixel et présentant un corps de bobine et un noyau. Le panneau du dispositif d'affichage est relié avec un panneau de base orienté vers sa face arrière, et présente au moins une ouverture dans une partie de chaque pixel. Une broche orientée vers l'ouverture et placée sur le panneau de base est associée à chaque ouverture, ladite broche comportant, sur sa face orientée vers le panneau, un évidement dans lequel est introduite une diode électroluminescente.
PCT/DE1999/001102 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique WO2000062274A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE29824339U DE29824339U1 (de) 1998-01-22 1998-01-22 Elektromagnetische Anzeigevorrichtung
DE19802218A DE19802218B4 (de) 1998-01-22 1998-01-22 Elektromagnetische Anzeigevorrichtung
ES99927654T ES2230859T3 (es) 1998-01-22 1999-04-09 Dispositivo electromagnetico de fijacion de anuncios.
CA002352821A CA2352821C (fr) 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique
EP99927654A EP1171860B1 (fr) 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique
DE59910607T DE59910607D1 (de) 1998-01-22 1999-04-09 Elektromagnetische anzeigevorrichtung
PCT/DE1999/001102 WO2000062274A1 (fr) 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique
AT99927654T ATE277399T1 (de) 1998-01-22 1999-04-09 Elektromagnetische anzeigevorrichtung
US09/856,444 US6603458B1 (en) 1998-01-22 1999-04-09 Electromagnetic display device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29824339U DE29824339U1 (de) 1998-01-22 1998-01-22 Elektromagnetische Anzeigevorrichtung
DE19802218A DE19802218B4 (de) 1998-01-22 1998-01-22 Elektromagnetische Anzeigevorrichtung
PCT/DE1999/001102 WO2000062274A1 (fr) 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique

Publications (1)

Publication Number Publication Date
WO2000062274A1 true WO2000062274A1 (fr) 2000-10-19

Family

ID=27208839

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/001102 WO2000062274A1 (fr) 1998-01-22 1999-04-09 Dispositif d'affichage electromagnetique

Country Status (6)

Country Link
EP (1) EP1171860B1 (fr)
AT (1) ATE277399T1 (fr)
CA (1) CA2352821C (fr)
DE (2) DE29824339U1 (fr)
ES (1) ES2230859T3 (fr)
WO (1) WO2000062274A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11841586B1 (en) * 2022-07-21 2023-12-12 Dell Products L.P. Position-adjustable backlight

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501912A1 (de) * 1985-01-22 1986-07-24 Friedrich Merk-Telefonbau GmbH, 8000 München Elektromagnetische anzeigevorrichtung
EP0327250A2 (fr) * 1988-02-01 1989-08-09 Mark IV Industries Limited Dispositif d'affichage électromagnétique
US5771616A (en) * 1996-07-19 1998-06-30 Mark Iv Industries Limited Display device with disk and LED

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501912A1 (de) * 1985-01-22 1986-07-24 Friedrich Merk-Telefonbau GmbH, 8000 München Elektromagnetische anzeigevorrichtung
EP0327250A2 (fr) * 1988-02-01 1989-08-09 Mark IV Industries Limited Dispositif d'affichage électromagnétique
US5771616A (en) * 1996-07-19 1998-06-30 Mark Iv Industries Limited Display device with disk and LED
US5771616C1 (en) * 1996-07-19 2001-07-03 Mark Iv Ind Ltd Display device with disk and led

Also Published As

Publication number Publication date
CA2352821A1 (fr) 2000-10-19
EP1171860A1 (fr) 2002-01-16
ATE277399T1 (de) 2004-10-15
ES2230859T3 (es) 2005-05-01
CA2352821C (fr) 2007-06-26
EP1171860B1 (fr) 2004-09-22
DE29824339U1 (de) 2000-12-21
DE59910607D1 (de) 2004-10-28

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