EP4100939B1 - Bis zur beleuchtung verborgene anzeigetafel und anzeigeanordnung damit - Google Patents

Bis zur beleuchtung verborgene anzeigetafel und anzeigeanordnung damit Download PDF

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Publication number
EP4100939B1
EP4100939B1 EP20711350.7A EP20711350A EP4100939B1 EP 4100939 B1 EP4100939 B1 EP 4100939B1 EP 20711350 A EP20711350 A EP 20711350A EP 4100939 B1 EP4100939 B1 EP 4100939B1
Authority
EP
European Patent Office
Prior art keywords
layer
opaque
stencil
translucent
display panel
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.)
Active
Application number
EP20711350.7A
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English (en)
French (fr)
Other versions
EP4100939A1 (de
Inventor
Katarzyna MAJDIUK
Justyna KRZYZYK
Krystian JAGODA
Marek Wozniak
Konrad STANEK
Wojciech SYREK
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.)
Merit Automotive Electronics Systems SL
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Merit Automotive Electronics Systems SL
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Publication date
Application filed by Merit Automotive Electronics Systems SL filed Critical Merit Automotive Electronics Systems SL
Publication of EP4100939A1 publication Critical patent/EP4100939A1/de
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Publication of EP4100939B1 publication Critical patent/EP4100939B1/de
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Classifications

    • 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
    • G09F13/06—Signs, boards or panels, illuminated from behind the insignia using individual cut-out symbols or cut-out silhouettes, e.g. perforated signs
    • 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
    • G09F13/08—Signs, boards or panels, illuminated from behind the insignia using both translucent and non-translucent layers
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F21/00—Mobile visual advertising
    • G09F21/04—Mobile visual advertising by land vehicles
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F21/00—Mobile visual advertising
    • G09F21/04—Mobile visual advertising by land vehicles
    • G09F21/049—Mobile visual advertising by land vehicles giving information to passengers inside the vehicles

Definitions

  • the present invention relates to a display panel, in particular for use in an automotive vehicle, having a layered construction having a front side to present displayed symbol to a user and a back side apt to be illuminated by a light source.
  • the present invention relates also to a display assembly comprising such a display panel.
  • Display panels of this kind are commonly used in various consumer devices to illuminate given symbol in a form of a mark, sign, picture, letter, word, or other when required.
  • the hidden until lit feature ensures that this symbol is visible only when illuminated from the back side of the panel. Since the energization of the light source is the only condition required to present the displayed symbol to the user, display panels of this kind have an advantage over the full-area 2-dimensional displays which are controlled by computer systems. Since no computer system can be made entirely hang or freeze-proof, malfunction of the computer system may lead to the malfunction of the display.
  • Display panels of this kind should provide sufficient brightness and homogeneity of the displayed symbol with substantially constant directivity or wide angle of visibility. Furthermore the light illuminating a given symbol on the panel should not propagate through the panel to illuminate other inactive (unlit) symbols of the panel, which adverse effect is commonly known as cross talk.
  • Publication GB 2558941 discloses an interior car part with a lighting element lying in a recess in a substrate and covered by a translucent layer and next a stencil layer, covered in turn by a top, translucent layer. From the front a visible effect of light through the stencil layer is seen and when the lighting element is switched off the presence of the element and the stencil is largely or completely hidden.
  • the part 10 may include an intermediate layer in line with the lighting element.
  • the top translucent layer and intermediate layer may be layers of lacquer.
  • the lighting element may comprise and electroluminescent device or one or more LEDs.
  • the top translucent layer and/or intermediate translucent layer may be tinted.
  • Publication US 2005/0074681 discloses a display panel including a transparent image recording sheet having electrophotographically formed thereon at least a background portion, wherein space factor of pinholes per unit area of the background portion is no greater than 1 ⁇ 10 -2 %.
  • the background portion has a transparent optical density of 3.0 or greater and an image portion has a transparent optical density of 1.0 or less, and preferably 0.1 to 1.
  • US 2012/0281423 discloses an illuminated indicator display apparatus for use in an automotive vehicle display or dashboard.
  • the illuminated indicator includes a light source, at least one baffle disposed adjacent the light source, a first panel disposed opposite the light source and connected to the at least one baffle, and a second panel spaced apart at a predetermined distance and positioned parallel to the first panel.
  • the first panel or the second panel further includes printed or painted graphics viewable to the operator of an automotive vehicle.
  • the baffle is made of an opaque material operable to block light from the light source.
  • the second panel is tinted dark operable only to allow a portion of the light from a light source to pass through the second panel thereby further dimming the light able to pass through the second pane Document KR101977221B1 is considered the closest prior art for the present invention.
  • Another object of the present invention has been to provide a display assembly comprising such a display panel.
  • the invention provides a display panel according to claim 1, as mentioned in the outset, characterized in that, it has a layered arrangement comprising a translucent solid base layer; an opaque stencil layer adjoining the front side of said translucent base layer and including voids representing symbols displayable at the front side of the panel when illuminated from the back side of the panel; an opaque crosstalk reduction layer adjoining the back side of said translucent base layer and including voids corresponding to said voids of said stencil layer or to the symbols defined by said voids of said stencil layer; and a semi-opaque layer adjoining the front side of said stencil layer.
  • translucent layer denotes a layer which allows light to pass through but on the macroscopic scale does not follow Snell's law providing diffuse reflection of light characterized by omni-directional reflection angles within the volume thereof (not following Snell's law), featuring an absorbance, defined as the logarithm with base 10 of the ratio of the incident optical power to the transmitted optical power (i.e. inverse of transmittance), of 0.4 or less (i.e. more than about 40% of the incident optical power is transmitted through the translucent layer).
  • opaque layer or "stencil layer” as used in the context of the present invention denotes a layer providing lightsealing ability (i.e. an ability to prevent light from transmitted therethrough) featuring an absorbance of 1.3 or more (i.e. up to 5% of the incident optical power is transmitted through the opaque layer).
  • semi-opaque layer or "hidden until lit layer” denotes a layer which is substantially opaque, but mainly due to its relatively low thickness, becomes non-opaque when illuminated by the light source from the back side of the panel, featuring an absorbance within the range of 0.4 to 1 (i.e. about 10 to 40% of the incident optical power is transmitted through the semi-opaque layer).
  • Said layered arrangement further comprises a tinted layer adjoining the front side of said hidden until lit layer.
  • tinted layer denotes a layer which is either transparent or translucent for the light within a predefined wavelength range of a light source used for backlighting the panel of the present invention featuring an absorbance for the light within a predefined wavelength range of 0.4 or less. This layer is responsible for the external appearance of the display panel but not for the hidden until lit functionality.
  • Said translucent base layer is made of plastic and has a thickness within the range of 0.2 to 1.5 mm (millimetre).
  • Said stencil layer, said opaque crosstalk reduction layer, said semi-opaque layer and/or said tinted layer is/are made of foil, paint, ink or lacquer and has/have a thickness within the range of 5 to 20 ⁇ m (micrometre).
  • said translucent base layer, said stencil layer, said opaque crosstalk reduction layer, said semi-opaque layer and/or said tinted layer is/are composed of more than one sublayer.
  • the display panel further comprises an adhesive layer adjoining the back side of said crosstalk reduction layer, made of glued tape or glue coating and having a thickness within the range of 10 to 100 ⁇ m.
  • the display panel according to the invention is easy and cost efficient to manufacture, in particular in embodiments in which all the layers but the carrier base layer are made by subsequent coating the base layer with paint, ink or lacquer. Due to relatively low thickness of the optic layers and elasticity of the base layer the panel is flexible and resistant to cracking and delamination.
  • the invention also provides display assembly comprising a housing having a number of chambers opening at the front face of the housing, and at least one light source disposed in at least one of said chambers, characterized in that, it further comprises a display panel as defined above and fixed to said front face of said housing.
  • said light source has a form of a light-emitting diode.
  • Figs. 1 and 2 show an embodiment of a display assembly 1 according to the present invention comprising a display panel 3 and a housing 2 containing energizable light sources 4.
  • the housing 2 is made of opaque plastic and comprises a number of chambers 21 opening at the front face 22 of the housing.
  • Light sources 4 in the form of a LED diodes are disposed at the bottoms of the chambers 21 and electrically connected with a separate control unit (not shown) through an interface socket 23 of the housing 2.
  • a narrow wavelength range such as 495 to 570 nm for green or 625 to 740 nm for red
  • the display panel 3 that shall be explained below is glued to the front face 21 of the housing 2.
  • the panel may display symbols 5 in a form of Latin letters 5a, words 5b and icons 5c, such as low fuel indicator, battery status, etc.
  • the display panel 3 shown in Fig. 3 and 4 has a layered construction and in this embodiment comprises a translucent solid base layer 31 made of translucent plastic such as polycarbonate (PC), poly(methyl methacrylate) (PMMA), or polyamide (PA) having a thickness of about 0.7 mm.
  • the base layer 31 provides support for the remaining layers of the panel 3 as well as diffuse reflection of light emitted by the light sources 4 characterized by omni-directional reflection angles within the volume of the base layer 31.
  • An opaque stencil layer 32 adjoins the base layer 31 at the front side thereof.
  • the stencil layer 32 is made of opaque foil or paint or ink coating and has a thickness of about 12 ⁇ m.
  • the stencil layer 32 includes voids 321 representing symbols 5a, 5b, 5c. Each symbol 5 can be viewed separately at the front side of the panel 3 when the light source 4 disposed in a given chamber 21 of the housing 2 is energised.
  • the stencil layer 32 and parts of the base layer 31 exposed by the voids 321 of the stencil layer 32 are coated at the front side thereof with a semi-opaque or hidden until lit layer 34 made of lacquer and having a thickness of about 10 ⁇ m.
  • the semi-opaque layer 34 is substantially opaque for the ambient light shining on it from the front side of the panel 3 but, mainly due to its relatively low thickness, becomes transparent when illuminated by the light source 4 from the back side of the panel 3,
  • An opaque crosstalk reduction layer 33 adjoins the base layer 31 at the back side thereof.
  • the crosstalk reduction layer 33 is mads of opaque paint which is opaque when illuminated by the light source 4 from the back side of the panel 3 and has a thickness of about 7 ⁇ m.
  • the crosstalk reduction layer 33 also includes voids 331 corresponding to the groups of voids 321 of the stencil layer 32 defining particular symbols 5, which are larger than voids 321 of the stencil layer 32.
  • the crosstalk reduction layer 33 absorbs photons emitted from the translucent base layer 31 that could otherwise be reflected back toward the front side of the panel 3 and pass through the voids 321 of the stencil layer 32 representing other inactive (or not directly illuminated by the light sources 4 located in a separate chambers 21) symbols 5 of the panel 3 producing an adverse cross talk effect.
  • the hidden until lit layer 34 is coated at the front side with a tinted layer 35 made of paint and having a thickness of about 10 ⁇ m.
  • the transparency range of the tinted layer 35 corresponds to wavelength range of the light sources 4.
  • the tinted layer 35 provides an appropriate colour and lusterlessness of the front surface of the panel 3 and has a class of surface finish according to the iSO 1302 standard of at least N4,
  • an adhesive layer 36 made of glued tape or glue coating and having a thickness of about 90 ⁇ m adjoins the crosstalk reduction layer 33 at the back side thereof.
  • the adhesive layer 36 also includes voids 361 substantially corresponding to the voids 331 of the crosstalk reduction layer 33.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Claims (5)

  1. Eine Anzeigetafel (3), zur Verwendung in einem Kraftfahrzeug, mit einer Vorderseite zur Darstellung eines angezeigten Symbols (5) für einen Benutzer und einer Rückseite, die von einer Lichtquelle (4) beleuchtet werden kann,
    mit einer schichtweisen Anordnung bestehend aus
    einer lichtdurchlässigen festen Basisschicht (31) mit einem Absorptionsvermögen von 0,4 oder weniger, die aus einem Kunststoff besteht, der nicht dem Snelliusschen Brechungsgesetz folgt und eine diffuse Reflexion des von der Lichtquelle (4) ausgesandten Lichts mit ungerichteten Reflexionswinkeln innerhalb des Volumens der lichtdurchlässigen festen Basisschicht (31) ermöglicht, und die eine Dicke im Bereich von 0,2 bis 1,5 mm aufweist;
    einer undurchsichtigen Schablonenschicht (32), die an die Vorderseite der lichtdurchlässigen Basisschicht (31) angrenzt, eine Absorption von 1,3 oder mehr aufweist und Hohlräume (321) enthält, die Symbole (5) darstellen, die auf der Vorderseite der Tafel (3) angezeigt werden können, wenn sie von der Rückseite der Tafel (3) beleuchtet werden;
    einer undurchsichtigen Schicht zur Verringerung des Übersprechens (33), die an die Rückseite der lichtdurchlässigen Basisschicht (31) angrenzt, eine Absorption von 1,3 oder mehr aufweist und Hohlräume (331) enthält, die den Hohlräumen (321) der Schablonenschicht (32) oder den durch die Hohlräume (321) der Schablonenschicht definierten Symbolen (5) entsprechen;
    einer an die Vorderseite der Schablonenschicht (32) angrenzenden halbdurchsichtigen Schicht (34) mit einer Absorption im Bereich von 0,4 bis 1; und
    einer getönten Schicht (35), die an die Vorderseite der halbundurchsichtigen Schicht (34) angrenzt, die für das Licht innerhalb eines vordefinierten Wellenlängenbereichs des von der Lichtquelle (4) emittierten Lichts transparent oder durchscheinend ist und eine Absorption für dieses Licht innerhalb eines vordefinierten Wellenlängenbereichs von 0,4 oder weniger aufweist, wobei
    die Schablonenschicht (32), die undurchsichtige Schicht zur Verringerung des Übersprechens (33), die halbundurchsichtige Schicht (34) und/oder die getönte Schicht (35) aus Folie, Farbe, Tinte oder Lack hergestellt ist/sind und eine Dicke im Bereich von 5 bis 20 µm hat/haben.
  2. Die Anzeigetafel nach Anspruch 1, dadurch gekennzeichnet, dass die lichtdurchlässige Basisschicht (31), die Schablonenschicht (32), die undurchsichtige Schicht zur Verringerung des Übersprechens (33), die halbundurchlässige Schicht (34) und/oder die getönte Schicht (35) aus mehr als einer Unterschicht besteht/bestehen.
  3. Die Anzeigetafel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie ferner eine Klebeschicht (36) umfasst, die an die Rückseite der Schicht zur Verringerung des Übersprechens (33) angrenzt, aus Klebeband oder Klebebeschichtung besteht und eine Dicke im Bereich von 10 bis 100 µm aufweist.
  4. Eine Anzeigeanordnung (1) mit einem Gehäuse (2), das eine Anzahl von Kammern (21) aufweist, die sich an der Vorderseite (22) des Gehäuses öffnen, und mit mindestens einer Lichtquelle (4), die in mindestens einer der Kammern (21) angeordnet ist, dadurch gekennzeichnet, dass sie ferner eine Anzeigetafel (3) nach einem der Ansprüche 1 bis 3 aufweist, die an der Vorderseite (21) des Gehäuses (2) befestigt ist.
  5. Die Anzeigeanordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Lichtquelle (4) die Form einer Leuchtdiode hat.
EP20711350.7A 2020-02-04 2020-02-04 Bis zur beleuchtung verborgene anzeigetafel und anzeigeanordnung damit Active EP4100939B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/PL2020/050015 WO2021158133A1 (en) 2020-02-04 2020-02-04 Hidden until lit display panel and a display assembly comprising thereof

Publications (2)

Publication Number Publication Date
EP4100939A1 EP4100939A1 (de) 2022-12-14
EP4100939B1 true EP4100939B1 (de) 2024-04-10

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ID=69811852

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Application Number Title Priority Date Filing Date
EP20711350.7A Active EP4100939B1 (de) 2020-02-04 2020-02-04 Bis zur beleuchtung verborgene anzeigetafel und anzeigeanordnung damit

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EP (1) EP4100939B1 (de)
WO (1) WO2021158133A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7150906B2 (en) 2001-06-13 2006-12-19 Denso Corporation Display panel and method of manufacturing the same
JP4683069B2 (ja) * 2008-04-25 2011-05-11 ソニー株式会社 表示装置
US20120281423A1 (en) 2011-05-02 2012-11-08 Toyota Motor Engineering & Manufacturing North America, Inc. Illuminated indicator display
GB2552996A (en) * 2016-08-19 2018-02-21 Gsm Automotive Ltd Illuminated panel assembly
GB2558941B (en) 2017-01-23 2021-09-01 Bayerische Motoren Werke Ag Interior car part with lighting element
KR101977221B1 (ko) * 2018-10-29 2019-05-10 주식회사 서연이화 필름 및 이를 포함하는 히든 스위치 구조

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Publication number Publication date
WO2021158133A1 (en) 2021-08-12
EP4100939A1 (de) 2022-12-14

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