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EP0395794A2 - Affichage à cristaux liquides - Google Patents

Affichage à cristaux liquides Download PDF

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Publication number
EP0395794A2
EP0395794A2 EP89118680A EP89118680A EP0395794A2 EP 0395794 A2 EP0395794 A2 EP 0395794A2 EP 89118680 A EP89118680 A EP 89118680A EP 89118680 A EP89118680 A EP 89118680A EP 0395794 A2 EP0395794 A2 EP 0395794A2
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
crystal display
pane
disc
area
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.)
Withdrawn
Application number
EP89118680A
Other languages
German (de)
English (en)
Other versions
EP0395794A3 (fr
Inventor
Stephan Zech
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
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 filed Critical Mannesmann VDO AG
Publication of EP0395794A2 publication Critical patent/EP0395794A2/fr
Publication of EP0395794A3 publication Critical patent/EP0395794A3/fr
Withdrawn legal-status Critical Current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 liquid crystal display with a large area formed by a pane and at least two display fields.
  • liquid crystal displays are as large as possible so that the individual displays can be read well and as many different displays as possible can be provided in one instrument. Design reasons also often speak for large-scale display areas. However, as the area increases, so does the cost of manufacturing such liquid crystal displays. Difficulties arise, for example, in the case of large-area displays because of the uniform layer thickness. Difficulties also arise with the uniform illumination of such displays.
  • the invention has for its object to provide a liquid crystal display of the type mentioned in such a way that the impression of a large-area liquid crystal display is created, but the problems associated with large-area liquid crystal displays are not given.
  • This object is achieved in that for each display panel there is a separate liquid crystal cell held from the rear against the pane, in that a narrow air gap is provided in the area of each display panel between the front of the respective liquid crystal cell and the pane and that the pane is exclusively is transparent in the area of the display fields.
  • liquid crystal display according to the invention is less expensive to produce than a single, large-area liquid crystal display, but looks optically like a large-area liquid crystal display. Due to the fact that the pane is transparent only in the area of the display fields, components present behind it remain invisible behind the display fields, so that they do not interfere. The narrow air gap between the pane and the liquid crystal cells prevents the formation of so-called Newton rings.
  • the transparency of the pane in the area of the display fields and its opacity in the other areas can be achieved very easily if, according to an advantageous embodiment of the invention, the back of the pane is made like a frosted glass by roughening and is smooth in the area of the display fields to produce transparency.
  • the smooth surface can be created by grinding the back of the pane in the areas of the display panels.
  • the smooth-surface areas can be created by polished areas of the mold.
  • An anti-reflective coating of the liquid crystal display can be achieved in a simple manner in that the front of the pane has a slight surface roughness.
  • the front of the pane with a coating.
  • a transparency of the pane outside the areas of the display fields can also be prevented by providing the front of the pane outside of the display fields with an opaque color print.
  • the pane is made as thin-walled as possible.
  • the pane should consist of a material with as little light attenuation as possible and should have a neutral color. This is particularly the case if the pane is made of polymethyl methacrylic (PMMA).
  • PMMA polymethyl methacrylic
  • Plastic as a material for the disc has the additional advantage that the disc can be manufactured inexpensively as a molded part.
  • the liquid crystal display shown in FIG. 1 has two display fields 2, 3 on a large-area pane 1, each of which is formed by a liquid crystal cell.
  • FIG. 2 shows how a liquid crystal cell 4 is inserted into the pane 1 from behind, forming a narrow air gap 5 of approximately 0.2 to 0.3 mm.
  • the front of the pane 1 is provided outside the region of the display panel 2 with an opaque color print 6 in order to make the pane 1 opaque there. This opacity could also be achieved by roughening the back of the pane 1 and grinding the pane 1 only in the areas of the display fields 2 and 3 to achieve transparency or, in the case of a molded part, the shape in the visible area on the back of the pane is polished.
  • Polymethyl methacrylic is particularly suitable as the material for the pane, since this material has extremely low light attenuation, is color-neutral and can be produced inexpensively as a molded part.

Landscapes

  • Liquid Crystal (AREA)
  • 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)
  • Liquid Crystal Substances (AREA)
EP19890118680 1989-05-03 1989-10-07 Affichage à cristaux liquides Withdrawn EP0395794A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893914614 DE3914614A1 (de) 1989-05-03 1989-05-03 Fluessigkristallanzeige
DE3914614 1989-05-03

Publications (2)

Publication Number Publication Date
EP0395794A2 true EP0395794A2 (fr) 1990-11-07
EP0395794A3 EP0395794A3 (fr) 1991-10-30

Family

ID=6380009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890118680 Withdrawn EP0395794A3 (fr) 1989-05-03 1989-10-07 Affichage à cristaux liquides

Country Status (2)

Country Link
EP (1) EP0395794A3 (fr)
DE (1) DE3914614A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299043A (en) * 1993-02-23 1994-03-29 Merlin Industries Underwater liquid crystal display apparatus having identical polarizers and reflector in both the matting and liquid crystal cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495805A1 (fr) * 1980-12-05 1982-06-11 Thomson Csf Dispositif electro-optique de visualisation a cristal liquide et son procede de fabrication
EP0149725A1 (fr) * 1984-01-09 1985-07-31 VDO Adolf Schindling AG Dispositif indicateur
EP0219700A2 (fr) * 1985-09-25 1987-04-29 Valeo Borg Instruments Verwaltung GmbH Indicateur électro-optique à grande surface

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495805A1 (fr) * 1980-12-05 1982-06-11 Thomson Csf Dispositif electro-optique de visualisation a cristal liquide et son procede de fabrication
EP0149725A1 (fr) * 1984-01-09 1985-07-31 VDO Adolf Schindling AG Dispositif indicateur
EP0219700A2 (fr) * 1985-09-25 1987-04-29 Valeo Borg Instruments Verwaltung GmbH Indicateur électro-optique à grande surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299043A (en) * 1993-02-23 1994-03-29 Merlin Industries Underwater liquid crystal display apparatus having identical polarizers and reflector in both the matting and liquid crystal cell

Also Published As

Publication number Publication date
EP0395794A3 (fr) 1991-10-30
DE3914614A1 (de) 1990-11-08

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