WO2008155608A2 - Noyau d'affichage d'un élément d'affichage magnétique - Google Patents

Noyau d'affichage d'un élément d'affichage magnétique Download PDF

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Publication number
WO2008155608A2
WO2008155608A2 PCT/IB2007/052315 IB2007052315W WO2008155608A2 WO 2008155608 A2 WO2008155608 A2 WO 2008155608A2 IB 2007052315 W IB2007052315 W IB 2007052315W WO 2008155608 A2 WO2008155608 A2 WO 2008155608A2
Authority
WO
WIPO (PCT)
Prior art keywords
display
nucleus
display element
element tube
magnetic
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.)
Ceased
Application number
PCT/IB2007/052315
Other languages
English (en)
Other versions
WO2008155608A3 (fr
Inventor
Song Lee
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.)
MPOT Pte Ltd
Original Assignee
MPOT Pte Ltd
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 MPOT Pte Ltd filed Critical MPOT Pte Ltd
Priority to PCT/IB2007/052315 priority Critical patent/WO2008155608A2/fr
Publication of WO2008155608A2 publication Critical patent/WO2008155608A2/fr
Publication of WO2008155608A3 publication Critical patent/WO2008155608A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G09F9/37—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 present invention relates to the display nucleus of a display element. More specifically, although of course not solely limited thereto, this invention relates to the display nucleus of a magnetic display element.
  • Magnetic display panels are often made up of many magnetic display elements or cells arranged in a matrix of rows and columns. Each display element represents a 'dot' and together, the 'dots' make up an image. Each dot can represent either of two colors, such as black and white, or shades of colors, such as from white to gray to black.
  • One such example of a display element comprises a long black display element tube with a white display nucleus which fits within it.
  • the display nucleus is shaped like a rod with the ends flat and the sides in good contact with the display element tube.
  • the display nucleus can be made of soft magnetic material like iron.
  • a magnetic pen can be used to attract the display nucleus forward towards the front opening of the display element tube.
  • a magnetic eraser can be used at the back of the display element and attract the display nucleus backward towards the back of the opening of the display element tube.
  • the display nucleus can remain stable in various depth positions within the display element tube because the contact forces between the display nucleus and the display element tube can overcome destabilizing forces like the self weight of the display nucleus.
  • the display nucleus When the white display nucleus is at the front end of the display element tube, the display nucleus can be seen clearly. The 'dot' is bright (white color). When the white display nucleus is at the back end of the display element tube, the white display nucleus cannot be seen clearly. Most of the light entering the display element tube is absorbed by the black display element tube before it can be reflected back out of the display element tube. As such, the display element tube appears dark (black). The display element can display various degree of brightness (grayscale) according to the depth position of the display nucleus within the display element tube. Disclosure of Invention Technical Problem
  • the first problem with the current display element is that the display element requires a relatively long display element tube to be able to produce a good contrast between bright (color) and dark (black) displays.
  • the length of the display element tube may be up to eight times the diameter of the opening of the display element.
  • an extremely strong and big magnet needs to be used to be able to attract the display nucleus forward when the display nucleus is at the other end of the display element tube.
  • such a long display element length would render such a display element not suitable in areas where there is space constraint.
  • One way which is being used to reduce the length of the display element tube is to introduce a light reducing film at the opening of the display element tube.
  • the length of the black display element tube can be shorter for it to display black when the white display nucleus is at the other end of the display element tube.
  • the drawback of such a solution is that it makes the display element reflect less light, even for the case when the white display nucleus is at the front end of the display element tube.
  • the display element becomes darker and less bright, the image collectively produced by the many display elements is dull or dark.
  • the second problem relates to the contact between the display element tube and the display nucleus.
  • both of them need to have a good fit.
  • the display nucleus might not be able to maintain its depth position within the display element tube and as a result, the display element cannot function properly. This increases the rejection rate of the display element and display panel.
  • the good fit might be affected by temperature changes as the volume of materials depend on their temperatures.
  • the third problem is that the display nucleus is made of soft magnetic material and is attracted by both south-pole and north-pole of a magnet. Hence if drawing is by using a magnet to attract the display nucleus forward, then erasing is by using a magnet to attract the display nucleus backward from behind the display element tube. This makes erasing of an image consisting of a matrix of display elements non-elegant and non- intuitive whereby drawing is from the front and erasing is from the back.
  • the first problem arises because the surface of the white display nucleus is flat and perpendicular to the direction of the tube. As such, light rays that come in parallel to the tube is also reflected back out without hitting or being absorbed by the black wall of the display element tube. Consequently, the length of the display element tube needs to be long. By having a curved surface or a surface for the display nucleus that is not perpendicular to the direction of the display element tube, more light rays are reflected to the wall of the display element tube when the display nucleus is further down the display element tube. Consequently, the length of the display element tube can be shorter.
  • the second problem can be resolved by avoiding the need for a good fit between the display nucleus and the display element tube.
  • the display nucleus can easily go into the display element tube.
  • the display nucleus By coating the display nucleus with a sticky adhesive or a liquid, the display nucleus will have the ability to maintain its depth position within the tube through adhesion or surface tension forces.
  • Another way is to design the display nucleus in such a way that its cross-section size can be easily varied to fit the size of the tube.
  • One such way is to have the whole nucleus made of compressible material with magnetic particles added.
  • Another way is to have a layer of non-magnetic compressible material around the incompressible soft magnetic material.
  • Yet another design is one which is similar to the design of a pipe cleaner. It can be made up of two or more wires twisted together with fibers.
  • the third problem can be resolved by using magnetized permanent magnetic material for the display nucleus.
  • a magnetized permanent magnetic material has both a north- pole and a south-pole. It can be attracted or repelled by a magnetic pen or magnetic eraser from the front of the display element tube according to the theory of magnetism whereby unlike poles attract and like poles repel.
  • the present invention allows for the display elements to be shorter and hence be used in areas where space constraint is an issue.
  • the display panel will also be lighter and use less material as a result being shorter. Without a light reducing film at the opening of the display element tube, the display element can have brighter displays.
  • FlG. 1 is a longitudinal cross-sectional view of a current magnetic display element with a display nucleus that has a flat display surface perpendicular to the direction of the display element;
  • FlG. 2 is a longitudinal cross-sectional view of a shorter display element with a display nucleus that has a curved display surface;
  • FlG. 3 shows other possible display surfaces of the display nucleus
  • FlG. 4 shows the longitudinal cross-sectional view of the display element with a display nucleus with additional coating
  • FlG. 5 shows the longitudinal cross-sectional view of display elements with various display nucleuses that can change size
  • FlG. 6 shows the longitudinal cross-sectional view of a display element with a magnetized permanent magnetic nucleus
  • FlG. 7 shows the various transverse cross-sectional shapes of display nucleuses.
  • FIG. 1 it shows a prior art of a longitudinal cross-sectional view of a magnetic display element 1.
  • the magnetic display element 1 comprises a display element tube 2, front screen 3, back screen 4, and a display nucleus 10a.
  • Light rays 6 enter the display element 1 through the front screen 3 and are reflected by the front display surface 11a of the display nucleus 10a.
  • the reflected rays 7a are reflected back out the front screen 3 to the viewer.
  • the display element tube 2 is black in color so as to absorb light, while the display nucleus 10a is of another color, such as white or any other colors to give the display element 1 the color required.
  • a long display element tube 2 of up to eight times the diameter of the tube's opening is required for it to be able to achieve a good contrast of bright (color) and dark (black) colors effectively. This is because light rays 6 that are parallel to the direction of the display element tube 2 are reflected back in parallel by the flat display surface 11a of the display nucleus 10a.
  • this invention shows a display nucleus 10b having a curved front display surface lib.
  • Light rays 6 parallel to the direction of the display element tube 2 enters the display element and are reflected by the curved display surface lib according to the theory of light reflection.
  • the reflected light rays 7b are non-parallel and less light returns to the viewer through the front screen 3.
  • the distance 12 between the display surface lib and the front screen 3 can be reduced to about two times the diameter of the opening of the display element tube 2.
  • the surfaces facing the front screen 3 and back screen 4 can be of the same shape. If the display element 1 is required to be able to be viewed from only one end, then the back surface of the display nucleus is not critical, and can be flat or other shapes.
  • the display nucleus 10b has an additional coating 13 which allows it to stick to the display element tube 2.
  • This coating 12 can be oil or grease, which allows the display nucleus 10b to stick onto the display element tube 2 or the front screen 3 or the back screen 4 in a stable position.
  • additional force such as an attractive magnetic force due to an external magnet
  • the display nucleus can move forward. It can remain stable in its new position after the removal of the external magnetic field as the oil or grease provides that required adhesion or stabilizing force.
  • Another type of coating is an adhesive which can stick and re-stick many times. Such coatings are often tacky in nature.
  • the coating described here are only examples and other coatings are possible as long as they provide the required functions.
  • the display nucleus 10b can be smaller than the internal size of the display element tube as the coating 13 provides the stabilizing forces required to maintain its depth position, instead of that provide by a good fit. It can be seen in FlG. 4 that there is a gap 14 between the display nucleus 10b and the display element tube 2.
  • the FlG. 4 is not to scale and has the gap 14 and the coating 13 enlarged to provide a better understanding. Normally, the coating 13 is very thin and the gap 14 can be smaller. No gap is also possible. However, the ability for the display nucleus 10b to function with or without gap 14 means that an exact fit is not required and this makes manufacturing easier and reduces the defect or rejection rate of display elements 1.
  • the display nucleuses 10c, 1Od, and 1Oe are larger than the transverse internal cross-section of the display element tube 2. However they can be inserted into the display element tube 2 because their sizes can become smaller.
  • the display nucleus 10c it has an incompressible core 20 such as iron and a compressible outer layer 21.
  • the compressible layer 21 reduces in size and allows the display nucleus to fit into the display element tube 2.
  • the compressed layer 20 pushes against the walls of the display element tube 2 and thereby stabilizes the depth position of the display nucleus within the display element tube 2.
  • the display nucleus 10c can still move forward or backward when additional forces act on it.
  • nucleus 1Od the whole nucleus is compressible, such as expanded polystyrene or polyurethane with non-permanent or permanent magnetic particles added. Again, it is compressed in order for it to fit into the display element tube 2.
  • nucleus 1Oe it has a central body made up of a twisted pair of wires 30 holding fibers 31 in place. It is similar to the pipe cleaners in design.
  • the fibers 31 can bend and cause the transverse cross-section to reduce in size, allowing the display nucleus 1Oe to fit into the display element tube 2.
  • the fibers provide the required contact forces to stabilize the depth position of the display nucleus 1Oe inside the display element tube 2. Although described here are a few ways to stabilize the depth position of the display nucleus 10 within the display element tube 2, they are not exhaustive and for those skilled in the art will find many other obvious ways of keeping the display nucleus stable.
  • the display nucleus 1Of has a magnetized magnetic core 40 and a compressible layer 41.
  • the magnetic core 40 allows it to be attracted to or repelled by an external magnetic force, depending on the polarity of the external magnetic field.
  • the external force can make the display nucleus 1Of move forward if it generates an attractive magnetic force, and make the display nucleus 1Of move backward if it generates a repulsive magnetic force.
  • the compressible layer 41 provides the stabilizing force to keep the display nucleus in a stable depth position when the external magnetic field is removed.
  • FIG. 7 it shows various transverse cross-sectional shapes of the display nucleuses 10.
  • the features of the invented display nucleus in reducing the length of the display element tube and achieving depth position stability of it within the display element tube can work with such transverse cross-sectional shapes or other shapes.
  • the display nucleus is useful to display elements. It allows shorter display elements to be made and allow display elements to react accordingly to the polarities of magnetic pens or magnetic erasers, allowing images to be drawn and erased from the front.
  • the display nucleus also reduces the failure or rejection rate of display elements and display panels.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention porte sur un noyau d'affichage d'un élément d'affichage magnétique. Le noyau d'affichage a une surface qui est généralement non perpendiculaire à la direction de l'élément d'affichage. Ceci permet à l'élément d'affichage d'être plus court. Le noyau d'affichage est stable à diverses positions de profondeur dans le tube de l'élément d'affichage, même si les coupes transversales du noyau d'affichage et de l'élément d'affichage ne sont pas nécessairement identiques. Ceci est dû au fait que la stabilité de position de profondeur du noyau d'affichage est fournie soit par un revêtement mince qui peut coller ou recoller au tube de l'élément d'affichage, soit un corps compressible qui peut s'ajuster à l'intérieur de l'élément d'affichage. Ceci réduit le taux de rejet d'éléments d'affichage et de panneaux d'affichage.
PCT/IB2007/052315 2007-06-18 2007-06-18 Noyau d'affichage d'un élément d'affichage magnétique Ceased WO2008155608A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/052315 WO2008155608A2 (fr) 2007-06-18 2007-06-18 Noyau d'affichage d'un élément d'affichage magnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/052315 WO2008155608A2 (fr) 2007-06-18 2007-06-18 Noyau d'affichage d'un élément d'affichage magnétique

Publications (2)

Publication Number Publication Date
WO2008155608A2 true WO2008155608A2 (fr) 2008-12-24
WO2008155608A3 WO2008155608A3 (fr) 2009-09-11

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PCT/IB2007/052315 Ceased WO2008155608A2 (fr) 2007-06-18 2007-06-18 Noyau d'affichage d'un élément d'affichage magnétique

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191100238A (en) * 1910-01-23 1911-06-21 Frantisek Janecek Improvements in or relating to Apparatus for Advertising Purposes, News Display or the like.
GB1145877A (en) * 1966-05-11 1969-03-19 Hans Fredrik Rydstrom Image reproducing device
JPH01302388A (ja) * 1988-05-31 1989-12-06 Nitto Kohki Co Ltd ディスプレイ素子、ディスプレイ方法、並びにディスプレイ装置
FR2856830B1 (fr) * 2003-06-30 2005-09-30 Jean Bernard Perrin Ecran d'affichage comportant des elements d'image constitues par une ampoule contenant de l'encre et un piston a tete blanche

Also Published As

Publication number Publication date
WO2008155608A3 (fr) 2009-09-11

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