WO2020161184A1 - Unité optique de rétroéclairage d'un afficheur - Google Patents

Unité optique de rétroéclairage d'un afficheur Download PDF

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Publication number
WO2020161184A1
WO2020161184A1 PCT/EP2020/052858 EP2020052858W WO2020161184A1 WO 2020161184 A1 WO2020161184 A1 WO 2020161184A1 EP 2020052858 W EP2020052858 W EP 2020052858W WO 2020161184 A1 WO2020161184 A1 WO 2020161184A1
Authority
WO
WIPO (PCT)
Prior art keywords
stack
foils
film
foil
display
Prior art date
Application number
PCT/EP2020/052858
Other languages
German (de)
English (en)
Inventor
Oliver Jakoby
Boris ECKERT
Peter Bolte
Helmut Marquardt
Stefan Keul
Original Assignee
Continental Automotive 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
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2020161184A1 publication Critical patent/WO2020161184A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/18—Handling of layers or the laminate
    • B32B38/1866—Handling of layers or the laminate conforming the layers or laminate to a convex or concave profile
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the present invention relates to a method for producing an optical unit for the backlighting of a display.
  • the invention further relates to an optical unit produced using the method for the background lighting of a display and a display with such a background lighting.
  • LCDs Liquid crystal displays
  • infotainment system or as an imaging unit for head-up Displays.
  • the display is based on mutually independent segments with liquid crystals that change their alignment when an electrical voltage is applied and thus influence the polarization direction of incident light. In this way, the permeability for polarized light that is generated with a backlight and another polarization filter changes on a polarization filter.
  • LED light-emitting diodes
  • a plurality of separate, stacked optical films are usually provided between the light guide and the liquid crystal layer in order to avoid scattering and deflection of the Light to ensure the most homogeneous possible illumination of the display surface.
  • a reflector is often provided in order to deflect light which does not initially propagate from the light guide in the direction of the liquid crystal layer in this direction and thus to increase the brightness and the efficiency of the display.
  • the stack of films of optical films used for homogeneous illumination of the display surface is currently usually produced by superimposing several prefabricated films in the final assembly of the backlight, for example by successively positioning the individual films on the light guide, aligning them and fixing them in a holding frame.
  • the individual optical foils are tailored to size and procured and processed. This is technically, logistically and cost-wise not the best solution and is very expensive. Furthermore, the individual foils can generate tinsel through friction with one another, which can interfere with the image generated by the display. Each of the individual foils must also be fixed separately in order to prevent any other potential noise generation in the event of vibrations, for example.
  • WO 2005/024473 A2 describes how to hold a stack of two or more optical foils together before inserting them into the display frame by gluing them to one another by means of an adhesive positioned outside the viewing area of the foils.
  • the optical unit comprises a plurality of optical films.
  • a stack of foils comprising at least two foils is formed with a first contour and bent at at least one edge, so that a lid-shaped stack of foils with a reshaped, bent part with an at least partially circumferential edge is produced.
  • At least one further film is introduced into the lid-shaped film stack.
  • film material for the at least two films of the film stack is arranged one above the other.
  • a stack of foils comprising at least two foils is formed from the foil material arranged one above the other isolated. The individual foils in the foil stack are then connected to one another at the edges.
  • the individual foils in the foil stack are advantageously pressed together and thereby thermally fused to one another at the edges.
  • the individual foils can advantageously also be connected to one another at the edges in the foil stack by means of an adhesive process.
  • the individual foils are preferably punched out in the shape and size required for the display lighting and connected in the foil stack after the punching by the adhesive process.
  • the individual foils can also be cut out in the shape and size required for the display lighting by means of a thermal fusion cutting process and connected by the cutting process by melting the edge phase in the foil stack.
  • an optical unit according to the invention for the background lighting of a display comprises a film stack having at least two films, wherein
  • a stack of foils comprising at least two foils and having a first contour is shaped and bent at at least one edge in such a way that a lid-shaped stack of foils with a reshaped, bent part having an at least partially circumferential edge is present;
  • At least one further film is introduced into the lid-shaped film stack.
  • a display according to the invention has a background lighting with an optical unit according to the invention.
  • the background lighting of the display preferably has a light guide and a reflector designed as a reflector film, the reflector film being introduced into the bevelled part of the film stack and the light guide being arranged between the reflector film and the film stack.
  • Fig. 1 shows a flow chart for the inventive
  • Fig. 2 shows schematically the production of an inven
  • optical unit consisting of a folded, made of several connected foils on facing foil stack and a reflector foil inserted into this;
  • Fig. 3 schematically shows a backlight with an optical unit according to the invention.
  • FIG. 1 shows a flow chart of a method according to the invention for producing an optical unit for the background lighting of a display.
  • No individual, pre-assembled foils are used here.
  • film material is stacked one on top of the other in a large sheet format for the various films.
  • the sheet format is typically rectangular and is preferably selected so that several of the required foils can be produced from one sheet.
  • it can also be present on a roll and unrolled from it.
  • a stack of foils comprising the foils is separated from the stacked foil material (S2).
  • Different methods can be used for this.
  • the foils can be punched out with the desired contour and size in punching processes with punching tools corresponding to the desired shape.
  • Laser, ultrasonic, water jet or plasma cutting processes can also be used, for example.
  • the individual foils in the foil stack are then in a third process step S3 by thermal fusing or by an additional adhesive process, e.g. after punching, joined together at the edges.
  • the film composite produced in this way can then be assembled in one piece as part of the final assembly of the backlight.
  • connection of the individual foils can also take place during the cutting process, if the edge phase of the foil stack is melted using a suitable cutting process, for example a laser or ultrasonic cutting process. Finally, it is also conceivable that the foil first to connect enmaterial and only then to separate.
  • the stack of foils produced has, for example, two or three foils stacked one on top of the other.
  • the foils used can have different optical properties.
  • diffusion foils or diffuser foils are used for the background lighting, which ensure a homogeneous scattering of the light that is emitted directly by LEDs or a light guide used as a light source.
  • Such diffusion films are typically translucent with high transmission values for the irradiated light, but are not completely transparent and appear cloudy. For example, depending on the configuration, between zero and three diffusion foils can be used.
  • prism films can be used, for example, which are highly transparent and can be used with a microprismatic surface to optimize the illumination.
  • prism sheet or two prism sheets with prism structures arranged perpendicular to one another can be used.
  • a combination of different types of film for example two prismatic films with one diffusion film, can also be used.
  • a fourth method step S4 the foil stack is then bent at the edges by hot forming, so that the restoring force of the foils is eliminated and the foil stack then permanently has a lid-like shape. This can also be done as part of a punching and bending process, in which the Foil stack is punched in a suitable contour and then folded.
  • a further film with a smaller contour adapted to the dimensions of the lid-shaped film stack is reshaped.
  • this further film can be a reflector film.
  • a sixth method step S6 this is pushed into the lid-shaped stack of foils so that the foils are prevented from slipping against one another.
  • a reflector foil can be introduced into the folded part of the foil stack, with a light guide arranged between the reflector foil and the foil stack also becoming part of this arrangement, so that a mechanically stable optical unit is created for the background lighting of a display. In this case, the ingress of dirt can be prevented by the circumferential edge.
  • the folding of the stack of foils can also be done on just one, two or three sides, depending on the overall structure.
  • the area of the coupling point can be left out of the fold.
  • FIG. 2 shows schematically the production of an optical unit according to the invention, consisting of a beveled stack of foils comprising three connected foils and a reflector foil inserted therein.
  • Foil sheets with foil material FM for the three foils are arranged one above the other, the foil material initially still being present separately.
  • three films F with the dimensions required for the background lighting of the display, which are then passed on for further processing.
  • Further foils can be produced from the excess remainder FR of the foil material, as long as the size of the remainder allows this.
  • a film composite FB consisting of the three films is then present, this being initially plane-parallel in the example shown.
  • a cover-shaped composite film FD is then produced by folding the edges of the film stack.
  • a mechanically stable optical unit OE is then present, and further optical elements, not shown here, can be arranged between the reflector film and the folded film stack.
  • FIG. 3 schematically shows a backlight with such an optical unit according to the invention, which can be used for an electronic display element, in particular in the form of a liquid crystal display.
  • the liquid crystals are typically arranged between two glass layers, polarizers being arranged above and below the glass layers. This structure is familiar to the person skilled in the art and is therefore not shown in the figure.
  • the backlight has a light source L, a plate-shaped one
  • Light guide LL a lid-shaped film composite FD with two optical films F for optimizing the illumination and a reflector film R on. But this is only an example Embodiment, for example, more than two foils and several reflector foils can also be present.
  • the light source L preferably generates white light and can in particular have an arrangement with a large number of light-emitting diodes (LEDs), but other designs are also possible, for example with one or more fluorescent tubes.
  • LEDs light-emitting diodes
  • the light source is positioned laterally as shown and the light from the light source is deflected by the light guide LL onto the actual display element.
  • the cover-shaped film composite FD on the LEDs is not folded.
  • the film composite FD contains optical films F for optimizing the illumination, whereby various optical properties of the background light can be influenced.
  • a reflector foil R is provided which deflects light that does not initially propagate from the light guide in the direction of the liquid crystal layer in this direction and thus increases the brightness of the display.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un procédé destiné à fabriquer une unité optique de rétroéclairage d'un afficheur, selon lequel l'unité optique comprend plusieurs feuilles optiques (F). Un empilement de feuilles (FB) comportant au moins deux feuilles est formé avec un premier contour et chanfreiné (S4) à au moins un bord. Au moins une autre feuille (R) est formée (S5) avec un deuxième contour adapté au premier contour. L'autre feuille est introduite (S6) dans la partie chanfreinée de l'empilement de feuilles.
PCT/EP2020/052858 2019-02-08 2020-02-05 Unité optique de rétroéclairage d'un afficheur WO2020161184A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019201647.2 2019-02-08
DE102019201647.2A DE102019201647A1 (de) 2019-02-08 2019-02-08 Optische Einheit für die Hintergrundbeleuchtung eines Displays

Publications (1)

Publication Number Publication Date
WO2020161184A1 true WO2020161184A1 (fr) 2020-08-13

Family

ID=69630257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/052858 WO2020161184A1 (fr) 2019-02-08 2020-02-05 Unité optique de rétroéclairage d'un afficheur

Country Status (2)

Country Link
DE (1) DE102019201647A1 (fr)
WO (1) WO2020161184A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024473A2 (fr) 2003-08-29 2005-03-17 3M Innovative Properties Company Empilement avec adhesif pour films optiques multiples
US20090078366A1 (en) * 2005-09-12 2009-03-26 Fujifilm Corporation Manufacturing method of optical sheets for display
US20100039584A1 (en) * 2008-08-12 2010-02-18 Sony Corporation Optical element laminate, backlight, and liquid crystal display apparatus
CN107728382A (zh) * 2017-11-29 2018-02-23 武汉天马微电子有限公司 背光模组及其制作方法和显示装置
US20190018284A1 (en) * 2017-07-14 2019-01-17 Japan Display Inc. Backlight device and liquid crystal display device comprising the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024473A2 (fr) 2003-08-29 2005-03-17 3M Innovative Properties Company Empilement avec adhesif pour films optiques multiples
US20090078366A1 (en) * 2005-09-12 2009-03-26 Fujifilm Corporation Manufacturing method of optical sheets for display
US20100039584A1 (en) * 2008-08-12 2010-02-18 Sony Corporation Optical element laminate, backlight, and liquid crystal display apparatus
US20190018284A1 (en) * 2017-07-14 2019-01-17 Japan Display Inc. Backlight device and liquid crystal display device comprising the same
CN107728382A (zh) * 2017-11-29 2018-02-23 武汉天马微电子有限公司 背光模组及其制作方法和显示装置

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