EP4476575A1 - Procédé de fabrication d'un composant pour dispositif de rétroéclairage, composant pour dispositif de rétroéclairage, dispositif de rétroéclairage, dispositif de génération d'images, afficheur tête haute associés - Google Patents
Procédé de fabrication d'un composant pour dispositif de rétroéclairage, composant pour dispositif de rétroéclairage, dispositif de rétroéclairage, dispositif de génération d'images, afficheur tête haute associésInfo
- Publication number
- EP4476575A1 EP4476575A1 EP23701880.9A EP23701880A EP4476575A1 EP 4476575 A1 EP4476575 A1 EP 4476575A1 EP 23701880 A EP23701880 A EP 23701880A EP 4476575 A1 EP4476575 A1 EP 4476575A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- component
- polycarbonate
- reflective polarizer
- optical film
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
- B29D11/00798—Producing diffusers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00865—Applying coatings; tinting; colouring
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
- G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- 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
- G02F1/133536—Reflective polarizers
Definitions
- the present invention generally relates to the field of displays.
- It relates more particularly to a method of manufacturing a component for a backlighting device, used for example in a head-up display for a motor vehicle, as well as such a component for a backlighting device, a backlighting device, a image generation device, and an associated head-up display.
- a so-called “head-up” display forms a virtual image in the field of vision of a motor vehicle driver.
- the latter can thus view information relating to the operation of the vehicle, relating to a traffic lane facing the vehicle, or others, without having to look away from this traffic lane.
- the virtual image, comprising the information to be displayed is then visually superimposed on the environment facing the vehicle.
- a so-called “head-up” display comprises, inside a housing, an image-generating device from which emerges a source light beam and an optical projection system suitable for projecting an image generated by the device for generating images towards the driver of the vehicle, via the windshield for example, so as to form the previously mentioned virtual image.
- Head-up displays for motor vehicles using a liquid crystal display (LCD, for "Liquid Crystal Display”, in English) in their image generation device are often exposed to two types of thermal stress producing heating of the screen: one of these constraints is linked to the light source of the head-up display, and the other to the concentration of the sun's rays on the screen.
- LCD liquid crystal display
- Such image-generating devices often comprise laminated elements on top of each other that are not very resistant to high temperature.
- the present invention proposes a method for manufacturing a component for a backlight device comprising the following steps: - deposition on a reflective polarizer of a coating layer, said reflective polarizer comprising a multilayer optical film,
- the optical diffuser has an angular distribution whose width at mid-height is less than 45 degrees with respect to a main direction of diffusion.
- the coating layer is formed of a material that polymerizes under ultraviolet radiation. It is then possible, for example, to subject the coating layer to ultraviolet radiation during the step of printing the patterns (in order to harden the coating layer then having the patterns).
- the reflective polarizer further comprises at least one polycarbonate layer deposited on the multilayer optical film.
- the reflective polarizer comprises another polycarbonate layer, the at least one polycarbonate layer and the other layer being arranged on either side of the multilayer optical film.
- the at least one polycarbonate layer is diffusing.
- the at least one polycarbonate layer has a diffusion angle of 2 degrees.
- the at least one polycarbonate layer is bonded to the multilayer optical film by means of a layer of optical adhesive.
- the dimensions and the shape of the patterns are defined on the basis of the angular distribution of the optical diffuser.
- One of the aspects of the invention also relates to a component for a backlight device comprising:
- said reflective polarizer comprising a multilayer optical film
- optical diffuser on a second face opposite the first face, wherein the optical diffuser is a coating layer comprising printed patterns.
- the reflective polarizer further comprises at least one polycarbonate layer deposited on the multilayer optical film.
- the at least one polycarbonate layer is bonded to the multilayer optical film by means of a layer of optical adhesive.
- the reflective polarizer comprises another polycarbonate layer, the at least one polycarbonate layer and the other layer being arranged on either side of the multilayer optical film.
- the at least one polycarbonate layer is diffusing.
- the optical diffuser has an angular distribution whose width at mid-height is less than 45 degrees with respect to a main direction of diffusion.
- Another aspect of the invention relates to a backlight device comprising:
- a light source configured to emit a source beam
- a reflector configured to reflect at least part of the source beam into a reflected beam
- Another aspect of the invention relates to an image generating device comprising a backlighting device according to the invention, characterized in that it further comprises a liquid crystal screen placed downstream of the reflector on the light propagation path.
- one of the aspects of the invention relates to a head-up display comprising an image-generating device according to the invention, further comprising an optical projection system capable of returning a light beam generated by the generation of images in the direction of a partially transparent slide.
- FIG. 1 is a schematic view showing the integration of a head-up display according to the invention in a motor vehicle
- FIG. 2 represents an embodiment of a backlighting device according to the invention
- FIG. 3 represents a component for a backlight device according to the invention
- FIG. 4 schematically represents the arrangement of certain components of an image generation device according to the invention.
- FIG. 5 represents the main steps of a method of manufacturing the component for a backlight device according to the invention.
- FIG 1 there is shown schematically the main elements of a head-up display 1, intended for example to equip a vehicle 2, in particular a motor vehicle.
- the display 1 of Figure 1 is adapted to project a virtual image 3 in the field of vision of a driver 4 of the vehicle 2, so that the driver 4 can see this virtual image 3 and any information that it contains without having to look away.
- the display 1 comprises a partially transparent blade 5 placed in the field of vision of the driver 4, an image generating device 6 adapted to generate an image light beam 7 and an optical projection system 8 adapted to return, in the direction of said partially transparent plate 5, the image light beam 7 generated by the image generating device 6 after passing through a transparent window 9.
- the light beam returned in the direction of the partially transparent plate 5 is partly reflected by the partially transparent plate 5 in the direction of the conductor 4 and thus produces the virtual image 3.
- the partially transparent blade 5 is here merged with the windshield of the vehicle 2. In other words, it is the windshield of the vehicle 3 which has the function of partially transparent blade 5 for the head-up display 1.
- the image generating device 6 and the optical projection system 8 are here placed in a housing 22, one opening is closed by the transparent window 9 already mentioned.
- the image generation device 6 comprises a backlight device 10, a liquid crystal screen 11 covering the device backlight 10, a first heat sink 12 and a second heat sink 13.
- the backlighting device 10 comprises a light source 14 of the matrix type of light-emitting diodes, a reflector 15 and an optical component 16.
- the light source 14 is configured to emit a source beam that diverges around a main direction D
- the reflector 15 receives at least part of the source beam and reflects at least part of it into a reflected beam in the direction of the optical component 16.
- the reflected beam is collimated here.
- the optical component 16 receives at least part of the reflected beam and transmits at least part of it in a diffused beam to the liquid crystal screen 11.
- the diffused beam illuminates the liquid crystal screen 11 so that the screen liquid crystals 11 allows at least part of the diffused beam to pass to form the image light beam 7.
- Figure 3 shows an embodiment of the structure of the optical component 16.
- the optical component 16 comprises on a first face a reflective polarizer 17 and on a second face, opposite the first face, an optical diffuser 18.
- a polarizer operating in reflection that is to say reflecting a determined polarization component Pd.
- optical diffuser is meant an optical element performing an angular spreading of an incident light.
- the reflective polarizer 17 consists of a multilayer optical film 171 fixed by gluing to a first polycarbonate layer 172 on one side and to a second polycarbonate layer 173 on the opposite side by means of two layers of optical glue 174a and 174b.
- the multilayer optical film 171 consists of a stack of dielectric layers.
- the multilayer optical film 171 comprises more than 100 atomic layers, for example between 100 atomic layers and 500 atomic layers, here 180 atomic layers, and/or has a thickness comprised between 20 microns and 200 microns, here 70 microns.
- the first polycarbonate layer 172 and the second polycarbonate layer 173 are here (slightly) diffusing.
- the first layer of polycarbonate 172 and the second layer of polycarbonate 173 each have an angular distribution whose width at mid-height is equal to 2 degrees with respect to a main direction of diffusion.
- the main diffusion direction is the direction normal to the plane of the first polycarbonate layer 172 and the second polycarbonate layer 173.
- the reflective polarizer 17 consists of a multilayer optical film 171 fixed by gluing to a first polycarbonate layer 172 on one side and to a second polycarbonate layer 173 on the opposite side, but only the one of the first polycarbonate layer 172 and the second polycarbonate layer 173 is (slightly) diffusing, the other not being diffusing.
- the reflective polarizer 17 consists of a multilayer optical film 171 fixed by gluing to a first polycarbonate layer 172 on one side and to a second polycarbonate layer 173 on the opposite side, and the first polycarbonate layer 172 and the second polycarbonate layer 173 are not diffusing.
- the reflective polarizer 17 consists of a multilayer optical film 171 fixed by gluing to a single polycarbonate layer.
- the single polycarbonate layer can be (slightly) diffusing or non-diffusing.
- the optical diffuser 18 comprises a coating layer of a material sensitive to ultraviolet radiation and able to adhere to the reflective polarizer 17.
- the optical diffuser 18 comprises patterns printed in the coating layer.
- the shape of the printed patterns is defined on the basis of the angular distribution of the optical diffuser 18.
- the angular distribution of the optical diffuser 18 has a Gaussian profile, the width of which at mid-height is equal to 30 degrees and 15 degrees respectively. in two perpendicular directions, and with respect to a main direction of diffusion.
- the main direction of diffusion is the direction normal to the plane of the optical diffuser 18.
- a light beam illuminating the optical component 16 and incident on the first polycarbonate layer 172 crosses (in part) the reflective polarizer 17, then the optical diffuser 18 and emerges therefrom in an angularly spread beam, with a angular distribution whose width at mid-height is equal, in the example mentioned above, to respectively 30 degrees and 15 degrees in two perpendicular directions.
- the shape of the patterns printed in the coating layer thus takes into account the diffusion introduced by the first polycarbonate layer 172 and the second polycarbonate layer 173 in order to obtain the angularly spread beam of standard deviation 30 degrees and 15 degrees in two perpendicular directions.
- the angular distribution of the optical diffuser 18 has a width at mid-height less than 45° with respect to the main direction of diffusion.
- the first face of the optical component 16 is positioned on the side of the reflector 15, which corresponds to the side of the light source 14. This configuration makes it possible to improve the recycling of light inside the backlight device 10. Indeed, if a portion of the source beam does not have the polarization transmitted by the reflective polarizer, it is reflected by the reflective polarizer 17 and can be reintercepted by the reflector 15, then reflected again in the direction of the optical component 16.
- the liquid crystal screen 11 comprises a matrix of liquid crystals interposed between an upstream polarizer 19 and a downstream polarizer 20, the upstream polarizer 19 being located on the side of the optical component 16.
- the upstream polarizer 19 is configured to selectively transmit a component of light having an upstream polarization Pa in the matrix of liquid crystals.
- a suitable activation of certain elements of the matrix of liquid crystals selectively allows the passage of the light received from the upstream polarizer 19 by modifying the polarization of the latter through the elements of the matrix of liquid crystals and transmission or not through the downstream polarizer 20.
- the determined polarization Pd reflected by the reflective polarizer 17 is adjusted orthogonally to the upstream polarization Pa. In other words, the polarization of the light Pt transmitted by the reflective polarizer 17 is aligned with the direction of polarization transmitted by the upstream polarizer 19 of the liquid crystal screen 11.
- FIG. 4 schematically illustrates this setting.
- the beam emerging from the liquid crystal screen 11 corresponds to the image light beam 7, represented in FIG. 1, generated by the image generation device 6.
- a coating layer of a material sensitive to ultraviolet radiation is deposited on a substrate provided with a reflective polarizer comprising a multilayer film (formed of layers of dielectric material).
- This reflective polarizer here also comprises two polycarbonate layers (possibly diffusing) arranged on either side of the multilayer optical film.
- annealing is carried out in order to fix the structure of the patterns in the coating layer. More precisely, the coating layer is illuminated with a beam of ultraviolet rays so as to produce a polymerization (that is to say a hardening) of the coating layer.
- the stack obtained is cut to the desired size in order to obtain the optical component 16.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2201099A FR3132775A1 (fr) | 2022-02-08 | 2022-02-08 | Procédé de fabrication d’un composant pour dispositif de rétroéclairage, composant pour dispositif de rétroéclairage, dispositif de rétroéclairage, dispositif de génération d’images, afficheur tête haute associés |
| PCT/EP2023/051451 WO2023151924A1 (fr) | 2022-02-08 | 2023-01-20 | Procédé de fabrication d'un composant pour dispositif de rétroéclairage, composant pour dispositif de rétroéclairage, dispositif de rétroéclairage, dispositif de génération d'images, afficheur tête haute associés |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4476575A1 true EP4476575A1 (fr) | 2024-12-18 |
Family
ID=81580435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23701880.9A Pending EP4476575A1 (fr) | 2022-02-08 | 2023-01-20 | Procédé de fabrication d'un composant pour dispositif de rétroéclairage, composant pour dispositif de rétroéclairage, dispositif de rétroéclairage, dispositif de génération d'images, afficheur tête haute associés |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20260169288A1 (fr) |
| EP (1) | EP4476575A1 (fr) |
| CN (1) | CN118661117A (fr) |
| FR (1) | FR3132775A1 (fr) |
| WO (1) | WO2023151924A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158245A (en) * | 1997-07-29 | 2000-12-12 | Physical Optics Corporation | High efficiency monolithic glass light shaping diffuser and method of making |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5175030A (en) * | 1989-02-10 | 1992-12-29 | Minnesota Mining And Manufacturing Company | Microstructure-bearing composite plastic articles and method of making |
| EP0736188B1 (fr) * | 1993-12-21 | 2002-09-18 | Minnesota Mining And Manufacturing Company | Polariseur reflechissant a luminosite amelioree |
| DE602006009090D1 (de) * | 2005-04-08 | 2009-10-22 | 3M Innovative Properties Co | Strukturierte orientierte filme zur verwendung in displays |
| KR101906251B1 (ko) * | 2012-12-06 | 2018-12-07 | 도레이케미칼 주식회사 | 다층 반사편광자 및 그 제조방법 |
| FR3071325B1 (fr) * | 2017-09-20 | 2021-06-18 | Valeo Comfort & Driving Assistance | Dispositif d'affichage tete haute |
| FR3123461B1 (fr) * | 2021-05-31 | 2023-11-24 | Valeo Comfort & Driving Assistance | Afficheur tête haute |
| JP2024539107A (ja) * | 2021-10-18 | 2024-10-28 | ディジレンズ インコーポレイテッド | ディスプレイシステム用の小型プロジェクタ |
| FR3132577B1 (fr) * | 2022-02-08 | 2024-09-27 | Valeo Comfort & Driving Assistance | Dispositif de rétroéclairage, dispositif de génération d’images, afficheur tête haute et procédé de fabrication associés |
-
2022
- 2022-02-08 FR FR2201099A patent/FR3132775A1/fr active Pending
-
2023
- 2023-01-20 EP EP23701880.9A patent/EP4476575A1/fr active Pending
- 2023-01-20 CN CN202380020995.5A patent/CN118661117A/zh active Pending
- 2023-01-20 US US18/837,050 patent/US20260169288A1/en active Pending
- 2023-01-20 WO PCT/EP2023/051451 patent/WO2023151924A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158245A (en) * | 1997-07-29 | 2000-12-12 | Physical Optics Corporation | High efficiency monolithic glass light shaping diffuser and method of making |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118661117A (zh) | 2024-09-17 |
| WO2023151924A1 (fr) | 2023-08-17 |
| FR3132775A1 (fr) | 2023-08-18 |
| US20260169288A1 (en) | 2026-06-18 |
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