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WO1987007394A1 - Affichage a cristaux liquides passif projetable - Google Patents

Affichage a cristaux liquides passif projetable Download PDF

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Publication number
WO1987007394A1
WO1987007394A1 PCT/DE1987/000244 DE8700244W WO8707394A1 WO 1987007394 A1 WO1987007394 A1 WO 1987007394A1 DE 8700244 W DE8700244 W DE 8700244W WO 8707394 A1 WO8707394 A1 WO 8707394A1
Authority
WO
WIPO (PCT)
Prior art keywords
display unit
pixels
display device
layer
polarization filters
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/DE1987/000244
Other languages
German (de)
English (en)
Inventor
Bernd Haastert
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.)
Individual
Original Assignee
Individual
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 claimed from DE19863617784 external-priority patent/DE3617784A1/de
Application filed by Individual filed Critical Individual
Priority to DE8712733U priority Critical patent/DE8712733U1/de
Priority to AT87903255T priority patent/ATE54761T1/de
Priority to DE8787903255T priority patent/DE3763804D1/de
Priority to PCT/DE1987/000244 priority patent/WO1987007394A1/fr
Publication of WO1987007394A1 publication Critical patent/WO1987007394A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • G02F1/133385—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell with cooling means, e.g. fans
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0427—Constructional details in the form of buttons
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds

Definitions

  • the invention relates to a projectable, passive liquid crystal display device, in particular liquid crystal matrix display device with a display unit to which an electronic control unit is assigned and on which individual planar elements, so-called pixels, which are connected to the control unit via conductor tracks, can be switched between a translucent and a light-absorbing state, and with two polarization filters, one of which is arranged in the light path in front, the other in the light path behind the display unit.
  • the known display devices of this type are flat units and are therefore also referred to as flat screen in English. They can be placed on the projection surface (object level) of an overhead projector, with the display unit in the object level. In this way, the information in the display unit can be mapped onto the image plane (screen, projection surface) in the form of, for example, writing, formulas, a drawing, surface elements or the like.
  • relatively large-area polarization filters must also be used.
  • the commonly used polarizing filters made of plastic film have a limited lifespan, typically a lifespan of 600 hours.
  • the polarizing foils are caused by heat and radiation degraded in illuminating light, especially by the UV component.
  • the display unit must also be replaced when the polishing films are exhausted.
  • the display unit itself is sensitive to heat. A sufficient contrast ratio is only achieved below 50 degrees, in modern display units even below 40 degrees C.
  • the polarizing films and the display unit heat up. The greatest part of the absorption takes place in the lower polarization film facing the light source, the heat generated there also being transferred to the display unit connected to it. Although there is only a slight absorption in the display unit itself, it also leads to an increase in temperature. Finally, a further portion of the light energy is held in the second polarization filter and heats it up. Since the second polarization filter is also connected to the display unit, heat is also transported to the display unit here.
  • liquid crystal displays offer a number of advantages which distinguish them from other displays, such as low supply voltage, freedom from flirting, low weight, flat overall height, transparency, freedom from radiation exposure. Use for projection devices is therefore desirable.
  • the object of the invention is to further develop the liquid crystal display devices of the type mentioned at the outset, in particular liquid crystal matrix displays, in such a way that they are suitable for projection and in particular for heat loading. stand on the projection table of an overhead projector.
  • the polarization filters cannot directly transmit the heat generated in them to the display unit.
  • the polarization filters can be replaced independently of the display unit.
  • a space is created between the display unit and the respective polarization filter, through which the air flow serving for cooling can flow. Since in the display devices which are usually operated in a horizontal state, the heat practically does not flow away through convective air currents, constant cooling is achieved via the forced air flow, which is preferably generated by a fan. This cooling not only benefits the actual display unit, but also extends the life of the polarizing films.
  • the display device is in a flat housing.
  • the display unit itself has approximately the size of the projection surface of overhead projectors, for example DIN A4 or A5 format.
  • the housing is only a few centimeters, e.g. B. 40 mm, high. Accordingly, the distance between the display unit and the polarization foils arranged above and below it is only a few millimeters, for example 15 to 20 mm.
  • the pressure side of the fan located in the housing is connected directly to the outside world via outlet openings and the air is sucked in through the housing through various inlet openings.
  • the air flow can be controlled in a targeted manner via the special arrangement of the inlet openings, via special air guide plates and the like.
  • the center of the polarization filters or the display unit is cooled more, and there is also a higher level of heat. It can also be enough that the areas of the filter or display unit located at the rear in the airway were supplied with fresh air at the side and are not only cooled with air which has already been heated by contact with other points.
  • a frame is particularly suitable for this purpose, into which the pane coated on the inside with the polarization film can be inserted.
  • the fixation can be done by snapping springs, quick-release screws, unscrewable feet or the like. It is crucial that the pane is placed on the outside of the housing, so that the housing does not have to be opened to remove the pane including the polarizing film.
  • a polarization filter rotatably on the housing.
  • the color in which the projection appears can be changed by rotating it.
  • the carrier plates for the polarization films and the actual display unit with a UV protective filter, in particular a vapor-deposited or glued layer. This avoids that the high-energy UV component leads to chemical processes and other damaging influences.
  • An anti-reflective layer or film on the surfaces of the polarization filters, plates, the display unit etc. is also advantageous, as a result of which the light reflection within the multilayer unit and thus the loss of light are reduced.
  • the invention relates to an improvement of the display unit itself.
  • a single-layer display unit all pixels are in the same plane.
  • the individual pixels must necessarily be electrically isolated from one another. This inevitably results in empty areas between the individual pixels.
  • the display unit is thus designed in such a way that when viewed vertically on the display surface, the pixels of the different layers complement one another to form a closed surface.
  • the described combined joining of two and more layers (information planes) to form a total area means that the distances between the pixels of a character or a representation that generally occur in liquid crystal displays in any operating mode can be avoided. If one uses instead of the polarization filters or in addition to these color filters, these are also arranged at a distance from the display unit and are located in the cooling air flow.
  • 1 is a sectional view through a display device for overhead projectors in side view
  • Fig. 2 is a partially sectional top view of the
  • FIG. 3 shows a detail sectional view through the area of a support leg
  • FIG. 4 shows two neighboring pixels that are located in one layer of the display unit
  • FIG. 5 shows an illustration of seven pixels each, which are located in two different layers of a double-layer display unit
  • FIG. 6 shows an illustration of a linear display unit with two layers.
  • the display device according to FIG. 1 is located on an upper, horizontal plate 20 with a glass insert 22 of an overhead projector, not shown here.
  • the display unit has a flat, essentially cubic housing, of which the right side wall 24, the left side wall 26, the upper wall 28 and the lower wall 30 are shown in the figure.
  • Square glass plates 32, 34 are inserted flush with the surface in the upper and lower wall 28, 30. They have on their inner sides an approximately uniform-sized polarization filter 36 and 38, which is glued to them over their entire area. Both glass plates 32, 34 including the polarization filter 36 and 38 they carry can be mounted quickly and without opening the housing and be dismantled. This is shown for the lower glass plate 34 in FIG. 1; reference is additionally made to FIG. 3.
  • the glass plate 34 is towards the interior of the housing by a ra-shaped, L- shaped flange 40 supported.
  • a likewise L-shaped, elastic, frame-shaped part 42 ensures flexible storage.
  • the glass plate 34 is pressed against the flange 40 by disks 46 connected to cylindrical feet 44, a total of four feet 44 are provided. There is an enormous thread in them.
  • a screw 48 is fixedly connected, for example glued, to the housing, which protrudes outward with its grub screw and engages in the internal thread of the associated foot 44. If the four feet 44 are unscrewed, the glass plate 34 including the associated polarization filter 38 can be removed.
  • a large number of holes 56 are provided in the right side wall 24, through which air flows into the interior of the housing (arrows 58). This air flows through the channel-like gaps above and below the display unit 50. It preferably sweeps over the lower polarization filter 38, in which the greatest light absorption and thus the greatest heat development take place.
  • the holes 56 are further arranged such that the central area of the polarization filters 36, 38 is preferably cooled.
  • baffles 75 are provided parallel to large end walls 70, 72 and approximately in an extension thereof downwards, which are only significantly shorter than the feet 44.
  • air inlet holes 76 to which air baffles are assigned.
  • the arrangement is such that air in the direction of arrows 78 sweeps past the underside of lower glass plate 34 and cools it. In this way, the particularly large heat development in the lower polarization filter 38 (approximately 65% of the total light absorption takes place there) is derived.
  • the individual air streams can be seen in plan view from FIG.
  • the figure shows that in particular the central areas of the parts 36, 38 and 50 are cooled.
  • the targeted cooling is achieved, on the one hand, by dimensioning the inlet holes 56, 60, 76 and, on the other hand, by air baffles, as indicated by the reference numbers 64 and 74.
  • the most distant holes 56 from the fan 68 have the largest diameter, the closer the air inlet openings are to the fan, the smaller their diameter generally becomes.
  • UV protection filters 82 are preferably provided in the light path (arrows 54) in front of the display unit 50, they are indicated by the reference symbol 82. Not shown is the possibility of rotating a polarization filter, for example the upper polarization filter 36, about an axis running parallel to the arrows 54. Known mechanisms can be used for this. 4 and 5, pixels 84, 86 of the display unit 50 are shown. In a known manner, LCD displays have electrically controllable areas which can be switched between permeable and non-permeable, depending on the control. These are called pixels. FIG. 4 shows two adjacent pixels 84 of one and the same layer of the display unit 50.
  • the pixels 84 must necessarily have a distance (free space 88) from one another in order to be electrically isolated from one another. This means that pixels of a single layer cannot fill an area in a closed manner.
  • the invention therefore proposes - even independently of the cooling arrangement mentioned - an at least two-layer display unit 50, in which the pixels 84 of the one layer are arranged in such a way that they complement the pixels 86 of the other layer to form a surface that is as closed as possible. This is shown in FIG. 5.
  • the square pixels 84 of the first layer are arranged corresponding to the black fields of a chess board, they are supplemented by the pixels of the second layer (arranged according to the white fields of a chess board) to form a practically closed surface.
  • very small holes 90 remain. These can be closed by a third layer, which provides pixels in their place.
  • the two layers of the display unit are arranged closely adjacent and separated from one another, for example by a thin glass or plastic pane.
  • FIG. 6 An example of a two-layer, linear display unit 50 is given in FIG. It has only one row of pixels 84 in the upper layer and a row 86 of pixels 86 in the lower layer that fills the gap. It is known that each individual pixel can be controlled separately. If all of the pixels 84, 86 of the two rows are driven, the line is either transparent or not permeable.
  • the display unit 50 according to FIG. 6 is advantageous in the case of linear scanning of information.
  • the row-shaped display unit 50 is scanned with a line-shaped light source, for example a fluorescent tube, the light of which is focused on the line-shaped pixel arrangement. All pixels 84, 86 of both layers can be switched simultaneously.
  • the multi-layer arrangement described can also be used to obtain relatively large-area display units.
  • One layer only takes over a part of the overall display, the other layer or the other layers take over the remaining areas.
  • Each layer has its own control unit, which is relieved due to the area distribution compared to control electronics for the entire area. This results in faster image build-up, higher contrast and a larger format.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)

Abstract

L'affichage à cristaux liquides passif projetable est pourvu d'une unité d'affichage (50) à laquelle sont adjoints une unité de commande électronique (52) et deux filtres de polarisation (36, 38) dont l'un est agencé dans le trajet de la lumière (flèche 54) devant l'unité d'affichage (50) et l'autre dans le trajet de la lumière derrière ladite unité d'affichage (50). Les deux filtres de polarisation (36, 38) sont disposés à distance de l'unité d'affichage (50) de telle manière qu'un passage d'air est formé entre l'unité d'affichage (50) et chacun des filtres de polarisation (36, 38); lesdits passages renferment un écoulement d'air (flèches 58, 62) qui vient en contact, en passant, avec les surfaces intérieures des filtres de polarisation (36, 38) et de l'unité d'affichage (50) et refroidit ces éléments.
PCT/DE1987/000244 1986-05-27 1987-05-27 Affichage a cristaux liquides passif projetable Ceased WO1987007394A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8712733U DE8712733U1 (de) 1986-05-27 1987-05-27 Projizierbare passive Flüssigkeitskristall-Anzeigevorrichtung
AT87903255T ATE54761T1 (de) 1986-05-27 1987-05-27 Projizierbare passive fluessigkeitskristallanzeigevorrichtung.
DE8787903255T DE3763804D1 (de) 1986-05-27 1987-05-27 Projizierbare passive fluessigkeitskristall-anzeigevorrichtung.
PCT/DE1987/000244 WO1987007394A1 (fr) 1986-05-27 1987-05-27 Affichage a cristaux liquides passif projetable

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19863617784 DE3617784A1 (de) 1986-05-27 1986-05-27 Projizierbare passive fluessigkeitskristallmatrix-anzeige in mehrschichtarchitektur mit wechselrahmen und absetzbaren filtern
DEP3617784.9 1986-05-27
PCT/DE1987/000244 WO1987007394A1 (fr) 1986-05-27 1987-05-27 Affichage a cristaux liquides passif projetable

Publications (1)

Publication Number Publication Date
WO1987007394A1 true WO1987007394A1 (fr) 1987-12-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000244 Ceased WO1987007394A1 (fr) 1986-05-27 1987-05-27 Affichage a cristaux liquides passif projetable

Country Status (2)

Country Link
DE (2) DE3763804D1 (fr)
WO (1) WO1987007394A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010582A1 (fr) * 1988-04-22 1989-11-02 Eastman Kodak Company Retroprojecteur
EP0361074A1 (fr) * 1988-08-23 1990-04-04 Citizen Watch Co. Ltd. Dispositif d'affichage à cristal liquide
EP0375425A3 (fr) * 1988-12-22 1991-09-18 Seiko Instruments Inc. Support de projection comprenant un panneau à cristal liquide
EP0422587A3 (en) * 1989-10-11 1992-02-26 Sanyo Electric Co., Ltd. Liquid crystal projector
EP0601210A4 (fr) * 1992-06-30 1995-03-29 Citizen Watch Co Ltd Unite d'affichage a cristaux liquides et projecteur a cristaux liquides l'utilisant.
EP0645661A1 (fr) * 1993-09-28 1995-03-29 Minnesota Mining And Manufacturing Company Panneau de projection à cristaux liquides
WO1995009389A3 (fr) * 1993-09-29 1995-05-04 In Focus Systems Inc Systeme d'affichage a ecran plat convertible
US5793452A (en) * 1995-09-13 1998-08-11 Canon Kabushiki Kaisha Display device with jig and cooling means
FR2835351A1 (fr) * 2002-01-25 2003-08-01 Cotep Systeme d'affichage a ecran plat
WO2011050908A3 (fr) * 2009-10-28 2011-06-23 Schott Ag Dispositif, en particulier pour un dispositif d'affichage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8700992U1 (de) * 1987-01-22 1987-03-05 Fa. Ed. Liesegang, 40221 Düsseldorf Projektionsvorrichtung
DE19607817A1 (de) * 1996-03-01 1997-09-04 Mediatec Ges Fuer Multimediale Anzeigeeinrichtung, insbesondere zur Fahrgastinformation an Bahnsteigen
TW200743862A (en) * 2006-05-23 2007-12-01 Sunonwealth Electr Mach Ind Co A heat-dissipating module for a back light set of a liquid crystal display

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127701A1 (fr) * 1983-06-07 1984-12-12 Datelcare B.V. Appareil pour projeter une image lumineuse
DE3413995A1 (de) * 1984-04-13 1985-10-17 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127701A1 (fr) * 1983-06-07 1984-12-12 Datelcare B.V. Appareil pour projeter une image lumineuse
DE3413995A1 (de) * 1984-04-13 1985-10-17 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 65, (P-263) (1502), 27. Marz 1984 & JP, a, 58211742 (Alps Denki K.K.) 9. Dezember 1983 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010582A1 (fr) * 1988-04-22 1989-11-02 Eastman Kodak Company Retroprojecteur
EP0361074A1 (fr) * 1988-08-23 1990-04-04 Citizen Watch Co. Ltd. Dispositif d'affichage à cristal liquide
EP0375425A3 (fr) * 1988-12-22 1991-09-18 Seiko Instruments Inc. Support de projection comprenant un panneau à cristal liquide
EP0422587A3 (en) * 1989-10-11 1992-02-26 Sanyo Electric Co., Ltd. Liquid crystal projector
EP0601210A4 (fr) * 1992-06-30 1995-03-29 Citizen Watch Co Ltd Unite d'affichage a cristaux liquides et projecteur a cristaux liquides l'utilisant.
US5508830A (en) * 1992-06-30 1996-04-16 Citizen Watch Co., Ltd. Liquid crystal display unit having an enclosed space between the liquid crystal cell and at least one polarizer
EP0645661A1 (fr) * 1993-09-28 1995-03-29 Minnesota Mining And Manufacturing Company Panneau de projection à cristaux liquides
WO1995009389A3 (fr) * 1993-09-29 1995-05-04 In Focus Systems Inc Systeme d'affichage a ecran plat convertible
US5793452A (en) * 1995-09-13 1998-08-11 Canon Kabushiki Kaisha Display device with jig and cooling means
FR2835351A1 (fr) * 2002-01-25 2003-08-01 Cotep Systeme d'affichage a ecran plat
WO2011050908A3 (fr) * 2009-10-28 2011-06-23 Schott Ag Dispositif, en particulier pour un dispositif d'affichage
US10384422B2 (en) 2009-10-28 2019-08-20 Schott Ag Device, in particular for a display unit

Also Published As

Publication number Publication date
DE3763804D1 (de) 1990-08-23
DE8712733U1 (de) 1988-01-14

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