EP0463602B1 - Anzeigegerät - Google Patents

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Publication number
EP0463602B1
EP0463602B1 EP91110429A EP91110429A EP0463602B1 EP 0463602 B1 EP0463602 B1 EP 0463602B1 EP 91110429 A EP91110429 A EP 91110429A EP 91110429 A EP91110429 A EP 91110429A EP 0463602 B1 EP0463602 B1 EP 0463602B1
Authority
EP
European Patent Office
Prior art keywords
picture elements
display apparatus
luminous
adjoining
elements
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.)
Expired - Lifetime
Application number
EP91110429A
Other languages
English (en)
French (fr)
Other versions
EP0463602A2 (de
EP0463602A3 (en
Inventor
C/O Mitsubishi Denki K. K. Hara Zenichiro
Nobuo C/O Mitsubishi Denki K. K. Terazaki
Shunichi C/O Mitsubishi Denki K. K. Futatsuishi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0463602A2 publication Critical patent/EP0463602A2/de
Publication of EP0463602A3 publication Critical patent/EP0463602A3/en
Application granted granted Critical
Publication of EP0463602B1 publication Critical patent/EP0463602B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2329/00—Electron emission display panels, e.g. field emission display panels

Definitions

  • the present invention relates to a display apparatus which displays a color image on a large screen by using a large number of luminous picture elements disposed in correspondence with a plurality of luminous colors.
  • Fig. 1 designates a perspective view of a conventional display apparatus disclosed in the Japanese Patent Application Laid-Open No. 64-2086 of 1989 for example.
  • the reference numeral 11 shown in Fig. 1 designates a display unit, in which a plurality of luminous picture elements 21 including a red picture element 2R, a green picture element 2G, and a blue picture element 2B, are respectively disposed in parallel with each other in matrix formation. A number of spacers 31 are provided between the adjoining luminous picture elements 21.
  • a magnifying unit 41 is disposed in front of the display unit 11.
  • the magnifying unit 41 includes a plurality of convex lenses 51 in matrix formation, each of which corresponds to each of luminous picture elements 21.
  • each of these luminous picture elements 21 is driven by a driving system (not shown) to emit its own color beam. As a whole, these luminous picture elements 21 are disposed at equal intervals. Assume that the interval (in other words, width of the spacer 31) is expressed in terms of P22.
  • this display apparatus may be composed of a plurality of display units 11 shown in Fig. 1 in alignment with each other. In order to precisely dispose these luminous picture elements 21 at equal intervals, it is essential for this display apparatus to provide the spacer width P22 which is more than double the edge-directional distance P23 between the most peripheral luminous the blue picture element 21 and the wall edge of the display unit 11.
  • each luminous picture element 21 While operating a large-screen display apparatus, luminosity of each luminous picture element 21 is controlled in order that the luminosity can always remain proportional to the amplitude of television signals. Although these luminous picture elements 21 are discretely aligned at the predetermined intervals, viewers can properly recognize the continuously running television image when they watch the display unit 11 across an adequate distance.
  • the display apparatus in order to secure high resolution of the image on a large-screen display, it is essential for the display apparatus to increase the number of the luminous picture elements 21 per unit area. In other words, it is essential for the system to contract the distance P21 between the center positions of the adjoining luminous picture elements 21. Nevertheless, as mentioned earlier, the display unit 11 must provide the spacer width P22 which is more than double the edge-directional distance P23, and yet, since the edge-directional distance P23 is substantially the wall thickness of the display unit 11, there is a definite limit to thin the edge-directional distance P23 furthermore. As a result, in order to increase the number of the luminous picture elements 21 per unit area, the dimension of these luminous picture elements 21 must be contracted.
  • the magnifying unit 41 in front of the display unit 11 like the one shown in Figs. 1 and 2.
  • a plurality of convex lenses 51 are provided in front of the corresponding luminous picture elements 21 by way of setting the center positions of those luminous picture elements 21 in perfect accord with the center positions of these convex lenses 51 in order to apparently expand the luminous area ratio so that image quality can eventually be improved.
  • the distance P21 between the centers of the adjoining luminous picture elements 21 is equal to the distance P41 between the centers of the adjoining convex lenses 51. Nevertheless, the apparent interval P42 between the luminous picture elements 21 is shorter than the original interval P22 between the luminous picture elements 21.
  • Fig. 4 designates another structure of the conventional display unit 11 in which the luminous picture elements 2 substantially composed of an independent red picture element R, or an independent green picture element G, or an independent blue picture element B, are aligned with each other. Even when using this structure, based on the reason cited above, it is also essential for the display unit 11 to provide the spacer width P22 which is more than double the edge-directional distance P23. In consequence, the finer the resolution of image on display, the narrower the area of each luminous picture element 2 as shown in Fig. 5, thus resulting in the lowered luminosity.
  • a display unit 1 designed for preventing luminosity from lowering itself as shown in Fig. 6, which contracts the distance P1 between two adjoining luminous picture elements in a group including four luminous picture elements to be shorter than the distance P2 between adjoining groups.
  • This system is disclosed in the Japanese Utility Model Application Laid-Open No. 63-174377 of 1988.
  • This system provides a spacer width P22 which is more than double the edge-directional distance P23, and yet, contracts the distance between adjoining luminous picture elements 2 of each group nit to be shorter than the distance between a luminous picture element 2 belonging to a group and a luminous picture element 2 belonging to another adjoining group in order that the area of these luminous picture elements 2 can be expanded from the area of the luminous picture elements 2 shown in Fig. 5.
  • the luminous picture elements 2 are necessarily disposed by applying uneven pitch containing deviation in the column and row directions every two luminous picture elements.
  • this structure usefully promotes luminosity, but instead, it lowers image quality, and thus, there is a definite limit in the possibility of expanding the area of each luminous picture element 2 even when composing a display apparatus based on this art.
  • any of the conventional display apparatuses incorporates any of those structures cited above. Nevertheless, since the conventional display apparatus respectively expands apparent luminous areas by applying the magnifying unit 41 by way of disposing all the luminous picture elements 21 based on the equal pitch, the actual luminous areas are not substantially expanded at all. As a result, luminosity cannot fully be promoted. In consequence, the conventional display apparatus cannot be effectively made available in bright environments like a rail-road station or an airport where a large number of passengers assemble. On the other hand, if the conventional display apparatus is compulsorily provided with intensified luminosity, excessive power like extremely high energy will be given to those luminous picture elements 21, thus quickly dissipating the service life of the display unit 11.
  • the conventional display apparatus disposing the luminous picture elements 2 based on uneven pitch is obliged to expand the areas of those luminous picture elements 2 for the sake of enhancing luminosity. This in turn means that the wider the areas of those luminous picture elements 2, the poorer the image quality in consequence. Because of this reason, the conventional display apparatus cannot practically expand the area ratio beyond a certain limit. This in turn involves critical problem.
  • An object of the invention is to provide a novel display apparatus that can securely provide highly intensified luminosity by substantially expanding areas of the luminous picture elements.
  • Another object of the invention is to provide a novel display apparatus that can securely provide extremely smooth color image by effectively preventing a degradation of the image quality.
  • a still further object of the invention is to provide a novel display apparatus that can securely protect durable service life of the display unit.
  • the invention provides a novel display apparatus available for displaying a stable color image on a large screen.
  • the display apparatus embodied by the invention incorporates a large number of luminous picture elements which are disposed in matrix formation. Of those many luminous picture elements, each four elements adjoining each other in the column and row directions are constructed into a group.
  • the display apparatus embodied by the invention characteristically comprises the following: a display unit in which the distance between the adjoining luminous picture elements in each group is substantially shorter than the distance between the adjoining luminous picture elements belonging to adjoining groups; and a magnifying unit which is disposed in front of the display unit, wherein the magnifying unit magnifies light beam emitted from each luminous picture element farther in the direction of the adjoining luminous picture elements belonging to adjoining groups than in the direction of the luminous picture elements adjoining each other in a group to which it belongs.
  • the magnifying unit provided for the display apparatus embodied by the invention apparently approximates the ratio (P1/P2) between the distance P1 between each luminous picture element and the distance P2 between each group to the value 1. In consequence, even though the display apparatus actually has an insignificant value of the ratio P1/P2, image quality can remain stable without incurring degradation at all.
  • Fig. 8(a) designates the sectional view of the display apparatus embodied by the invention.
  • the reference numeral 1 designates a display unit
  • 2 designates a large number of luminous picture elements consisting of red, green or blue independent picture elements
  • 4 designates a magnifying unit in which a large number of convex lenses 5 are aligned in correspondence with respective luminous picture elements 2.
  • Fig. 8(b) designates the magnified condition of light beams emitted from the luminous picture elements 2 when viewers look at the front of the magnifying unit 4.
  • a number of luminous picture elements 2 are disposed in the display unit 1 according to the arrangement shown in Fig. 1 for example.
  • Fig. 7 shows the arrangement in which each four luminous picture elements 2 conjunctionally make up a group, and, the red picture element R, the green picture elements G, and the blue picture element B, are disposed according to the predetermined composition ratio 1:2:1. Furthermore, less than 0.6 is provided for the ratio P1/P2 between the inter-element distance P1 between the luminous picture elements adjoining each other in each group and the inter-group distance P2 between the adjoining luminous picture elements belonging to adjoining groups. As mentioned earlier, when introducing the above arrangement based on less than 0.6 of the ratio P1/P2, image quality significantly lowers.
  • the display apparatus embodied by the invention when looking at the magnifying unit 4 from the front, viewers can witness a number of magnified luminous picture elements 2a containing a ratio P1/P2 which is closer to the value 1 than the actual ratio value present in the display unit 1.
  • the display apparatus embodied by the invention can securely prevent the image quality from adversely being affected by uneven pitch, and yet, effectively promotes image resolution availing of properly magnified areas of the aligned luminous picture elements.
  • the display apparatus embodied by the invention apparently materializes substantial magnification of luminous area more than that is normally generated by any conventional display apparatus.
  • the display unit 1 contains 1:2:1 of the composition ratio of the R.G.B. components in a group of four luminous picture elements 2.
  • the embodiment of the invention may also use a composition ratio based on any value other than the one specified above.
  • the display unit 1 embodied by the invention may not only use the three primary colors, but may also use monochromatic composition as well.
  • the display apparatus embodied by the invention disposes a large number of luminous picture elements in the display unit by way of contracting the distance between the luminous picture elements to be shorter than the distance between groups, and yet, provides the magnifying unit such like convex lenses in order that the distance between adjoining luminous picture elements can apparently approximate the distance between adjoining groups.
  • the display apparatus embodied by the invention can securely promote luminosity by effectively applying magnified luminous areas, and yet, the display apparatus stably provides fine and smooth images without causing image quality to degrade, while effectively promoting the service life to a great extent.

Landscapes

  • 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)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Liquid Crystal (AREA)

Claims (7)

  1. Anzeigegerät mit:
       einer Anzeigeeinheit, die eine Mehrzahl von leuchtenden Bildelementen (2) enthält, die in Gruppen in Matrixformation angeordnet sind, wobei der Abstand (P₁) zwischen benachbarten Bildelementen in jeder Gruppe kleiner ist als der Abstand (P₂) zwischen benachbarten Bildelementen, die zu benachbarten Gruppen gehören, wobei die Gruppen aus einer Anzahl von Bildelementen zusammengesetzt sind; und
       einer Vergrößerungseinheit (4), die einen von jedem leuchtenden Bildelement (2) ausgesandten Lichtstrahl stärker in der Richtung von denjenigen benachbarten leuchtenden Bildelementen, die zu benachbarten Gruppen gehören, als in der Richtung derjenigen benachbarten leuchtenden Bildelementen in der Gruppe, zu der das leuchtende Bildelement gehört, vergrößert,
       dadurch gekennzeichnet, daß
       die Bildelemente (2) einer jeweiligen Gruppe in Zeilen- und Spalten-Richtung angeordnet sind, und
       die Vergrößerungseinheit (4) eine Mehrzahl von Vergrößerungselementen (5) enthält, die jeweils in Gegenüberlage mit den Bildelementen angeordnet sind, wobei jedes aus der Mehrzahl von Vergrößerungselementen (5) einen von jedem der Mehrzahl von Bildelementen (2) abgegebenen Lichtstrahl stärker in der Richtung derjenigen benachbarten Bildelemente, die zu benachbarten Gruppen gehören, als in der Richtung derjenigen benachbarten Bildelemente (2) in der Gruppe, zu der das Bildelement (2) gehört, verstärkt.
  2. Anzeigegerät nach Anspruch 1, wobei die Bildelemente (2) von vorne gesehen mit anscheinend gleichen Intervallen ausgerichtet sind.
  3. Anzeigegerät nach Anspruch 1 oder 2, wobei die Mehrzahl von Vergrößerungselementen eine Mehrzahl von konvexen Linsen (5) ist.
  4. Anzeigegerät nach Anspruch 3, wobei die Mitte jeder konvexen Linse (5) von der Mitte des entsprechenden Bildelements in der Richtung der Mitte der Gruppe, zu der das betreffende Bildelement gehört, abweicht.
  5. Anzeigegerät nach Anspruch 1 oder 2, wobei die Mehrzahl von Vergrößerungselementen eine Mehrzahl von optischen Fasern (5a) ist.
  6. Anzeigegerät nach einem der vorhergehenden Ansprüche, wobei vier Bildelemente (2), die einander jeweils in Zeilen- und Spalten-Richtung benachbart gegenüberliegen, eine Gruppe bilden.
  7. Anzeigegerät nach Anspruch 6, wobei die Gruppe aus einem roten Bildelement, zwei grünen Bildelementen und einem blauen Bildelement besteht.
EP91110429A 1990-06-26 1991-06-25 Anzeigegerät Expired - Lifetime EP0463602B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16804990A JPH0457493A (ja) 1990-06-26 1990-06-26 表示装置
JP168049/90 1990-06-26

Publications (3)

Publication Number Publication Date
EP0463602A2 EP0463602A2 (de) 1992-01-02
EP0463602A3 EP0463602A3 (en) 1992-02-26
EP0463602B1 true EP0463602B1 (de) 1995-04-26

Family

ID=15860884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110429A Expired - Lifetime EP0463602B1 (de) 1990-06-26 1991-06-25 Anzeigegerät

Country Status (3)

Country Link
EP (1) EP0463602B1 (de)
JP (1) JPH0457493A (de)
DE (1) DE69109188D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698941A (en) * 1996-01-16 1997-12-16 Motorola Optical correction layer for a light emitting apparatus
FR2755530B1 (fr) * 1996-11-05 1999-01-22 Thomson Csf Dispositif de visualisation et ecran plat de television utilisant ce dispositif
CN114355659B (zh) * 2022-03-21 2022-06-14 南昌虚拟现实研究院股份有限公司 基于阵列基板结构的光学显示器件制作方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924356A (en) * 1988-12-07 1990-05-08 General Electric Company Illumination system for a display device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, P field, vol. 8, no. 228, October 19, 1984, page 138 P 308; JP A 59 109 028. *

Also Published As

Publication number Publication date
EP0463602A2 (de) 1992-01-02
JPH0457493A (ja) 1992-02-25
EP0463602A3 (en) 1992-02-26
DE69109188D1 (de) 1995-06-01

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