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
  • G09F13/12—Signs, boards or panels, illuminated from behind the insignia using a transparent mirror or other light reflecting surface transparent to transmitted light whereby a sign, symbol, picture or other is visible only when illuminated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
  • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
  • B60Q1/2661—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic mounted on parts having other functions
  • B60Q1/268—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic mounted on parts having other functions on windscreens or windows
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
  • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
  • B60Q1/50—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking
  • B60Q1/503—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking using luminous text or symbol displays in or on the vehicle, e.g. static text
  • B60Q1/5035—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking using luminous text or symbol displays in or on the vehicle, e.g. static text electronic displays

Definitions

• Rear-illuminated display device with a particular uniform exterior appearance
• the present invention relates to the general field of backlight display devices. Such devices make it possible to display various display elements.
• the display elements are supported by a transparent film covered with an opaque deposit precisely interrupted at these display elements.
• the display elements are advantageously materialized by printing white paint on the transparent film.
• Such display devices can be used in all types of human / machine interface, whether on a control panel, a center console, a dashboard, since at least one symbol wins to be hidden when the backlight is not lit.
• Such a display device comprises a window made of material having a low light transmission, for example a transmission ratio of between 10% and 30%.
• This window is placed on top of an interrupted film at the level of display elements, advantageously materialized by a white paint printing to ensure homogeneity of vision in all the angles at which the display elements can be observed.
• backlighting or backlighting the light sent to the film makes all the symbols visible from the outside of the display device. In the absence of back lighting, the window masks the film.
• the areas where the display elements are reflected light while areas without display elements absorb light Thus, alternating areas of different shades of color is visible to the user. This is unsatisfactory from an aesthetic point of view. Indeed, in such a case, the display area is easily identifiable on a black panel when the backlight is off which is contrary to the desired effect.
• the low transmission rate requires powerful light sources, which poses a problem not only in terms of the electrical power consumed, but also to evacuate the heat produced by the light source (s), thus imposing additional construction constraints .
• the solutions generally adopted to manufacture a black appearance display device are compromises between the appearance dark, or even black, of the display panel when the rear light is off and the visibility of the display elements at a distance with a certain amount of light used in rear lighting when it is on.
• a backlight display element display device comprising a semi-transparent layer of light reflective material between the display elements and a window made of a material. partially transparent giving the display device a particular uniform appearance.
• Another aim is to obtain a display device that makes it possible to use less powerful light sources while keeping or improving the aesthetic aspect.
• the semitransparent light reflective material layer allows the reflection of the external light so that it does not reach a film onto which the display elements are carried.
• the subject of the invention is a device for displaying rear-illuminated display elements comprising a semi-transparent layer of material reflecting the light between the display elements and a window made of a partially transparent material. conferring display device a particular uniform appearance, characterized in that the semi-transparent layer of light reflecting material is carried by an independent film inserted under the window and above the display elements.
• the use of a darker window is allowed than in the case where the display device is not provided with a reflective device layer between the window and the transparent film carrying the display elements.
• the light reflecting material is a metal.
• the metal used can be chosen from aluminum or chromium.
• the semi-transparent layer and the independent film are for example made in the form of a metallized polycarbonate sheet.
• the window may be chosen so that the particular uniform appearance is a particular color, for example having a high absorption rate such as black. This produces a display device corresponding to the current trend to provide the automotive control panels with a uniform aesthetic, black and where the displays are very discreet.
• the display elements are supported by a support film covered with an opaque deposit interrupted at these display elements.
• a support film covered with an opaque deposit interrupted at these display elements.
• the display elements can then simply be printed with a white paint on the film at interruptions of the opaque deposit.
• a method of manufacturing this support film by character printing is possible and allows a simple embodiment of the device. It is also possible to provide the display device with a liquid crystal screen placed behind the support film opposite an interruption of the opaque deposit. This is usually what is used when a display device must be able to display both variable digital data, then displayed on the LCD, and symbols that are located at particular places in the control panel. but not likely to change appearance.
• the window transmits between 50% and 80% of the light received.
• Such light transmission properties in combination with a layer of reflective material, make it possible to obtain the desired aesthetic appearance.
• the semi-transparent layer of light reflecting material transmits between 70% and 80% of the light received.
• FIG. 1 is a schematic representation of a display device according to the prior art
• FIG. 2 is a schematic representation of a display device according to one embodiment of the invention
• FIG. 3 is a schematic representation of a display device according to another embodiment of the invention.
• FIG. 1 depicts a display device 1 according to the prior art.
• This display device 1 comprises a window 11 of material having a low light transmission, for example a light transmission rate of 5%. To the eye, this window 11 seems so dark. It can be gray, black or loaded with pigments of various colors. The dark window 11 has a black overall appearance when the backlight is off. Locally, this window 11 can be painted with our opaque paint so as to completely hide the possible elements, for example mechanical or electronic, located behind the window 11 which could be visible from the outside and which never need to be visible from the outside.
• the window 11 is placed on top of a partially transparent support film 12, and covered with an opaque deposit 120. interrupted at the level of display elements 121 A, 121 B, 121 C which it is intended to carry .
• the display elements 121A, 121B, 121C are generally symbols placed at interruptions of the opaque deposit 120 and materialized by a white paint print to ensure a uniformity of vision in all the angles according to which the display elements can to be observed.
• a particular interruption of the opaque deposit 120 is provided to be placed vis-à-vis a display element 122 such as a liquid crystal display 122.
• a display element 122 for example VTD displays ("Vacuum Fluorescent Display” in English), a TFT screen ("Thin Film Liquid Transistor Crystal Display (TFT-LCD), a variant of liquid crystal screens, or LED screens (" Light emitting Diode In English), or OLED ("organic light-emitting diode”).
• the light it sends to the support film 12 passes through the liquid crystal display and / or the display elements 121A, 121B, 121C, especially in white paint, printed on the film 12 and then the window 11.
• the crossing of the window 11 takes place at the rate of, for example, 5% of the light received .
• the total transmittance of emitted light is therefore about 5% at the LCD screen 122 or printed symbols or display elements 12 IA, 121B, 121C
• the black window 11 masks the support film 12 so that the alternation of opaque deposit zones 120 and of particular interruption zones of the opaque deposit 120 marking the display elements 12 IA, 12 IB, 12 IC or the LCD screen 122 on the support film 12 is not visible from the passenger compartment.
• the opaque deposit zones 120 have a reflection ratio of 10% and the areas with the display elements 121A, 12B, 121C have a reflection ratio of 50%.
• the perception L A for the zones comprising the display elements 121A, 121B, 121C is:
• the perception L B for the opaque deposit zones 120 is:
• contrast is an intrinsic property to an image that quantifies, the ability to distinguish two distinct regions.
• FIG. 2 showing a display device 2 according to the invention.
• This display device 2 has the same technical elements as the display device shown in FIG. 1. The references of these technical elements will consequently have identical references as defined in relation to FIG. 1.
• the display device according to the invention further comprises a layer 23 of a semi-transparent material reflecting light.
• This layer 23 of reflective material is carried by an independent film (considering the thinness of the layer and the independent film, both have the same reference number), or in other words a sheet or film here placed on the outer surface of the transparent support film 12.
• the semi-transparent layer 23 and the independent film are made for example in the form of a metallized polycarbonate sheet.
• this independent film in the form of a sheet can be placed on the support film or be in physical contact with it.
• this layer is carried by a film other than the support film 12, inserted between the window 11 and the support film 12.
• the layer 23 of reflective material therefore acts as a mirror when the external daylight is reflected on it.
• the opaque deposition zones 120 have a reflection ratio of 10% and the zones comprising the display elements 121A, 121B, 121C have a reflection ratio of 50%. Furthermore, the support film 12 has a transmission rate of 50%. The sum of the transmission and reflection rates being 100%, assuming no energy absorption is made, the reflection rate is therefore 50%
• the perception L A for the zones comprising the display elements 121A, 121B. 121C is:
• the perception L B for the opaque deposit zones 120 is:
• a contrast C 2 is then obtained, for the example of FIG.
• the contrast between the Opaque deposit zones 120 and the areas comprising the display elements 121A, 121B, 121C is 8.25 times higher. without the film 12 that a configuration comprising the film 12. It therefore appears that the areas comprising the display elements 121 A, 12 IB, 12 IC are more visible in a configuration without a layer 23 than a configuration with a layer 23 Thus, the general appearance in off mode is more homogeneous for a configuration with a layer 23 because the contrast between the various areas is lower.
• the window can transmit up to 80% of the light.
• this light is an external light, shown schematically in Figure 2 by the arrows EL, this light is reflected uniformly on the semi-reflective layer 23, for example a metal deposit.
• the appearance of the display device is therefore uniform to that of the window 11.
• the display elements 121A, 121B, 121C and the liquid crystal screen 122 are not visible through the display. this.
• the backlight when the backlight is on, the backlight, represented by the arrow BL in FIG. 2, passes through the layer 23 of light reflecting material.
• This layer therefore has a transmission rate of between 70 and 80% and only 20 to 30% of the emitted light is reflected by this layer. Then, this light passes through the window at 50% to 80% of the light power through the metal deposit 23. The resulting light transmission is then between 35% and 64%.
• FIG. 3 differs from the embodiment of FIG. 2 in that on the one hand the display element 122 is made in the form of a display screen, for example VFD ("Vacuum Fluorescent Display") displays.
• VFD Volt Fluorescent Display
• TFT-LCD Thin Film Transistor Liquid Crystal Display
• LED light emitting diode
• OLED organic light -emitting diode "in English) without back lighting and secondly that there is no support film as in the previous embodiment.
• this layer 23 of reflective material is carried by an independent film (given the thinness of the layer and the independent film, both have the same reference number), or in other words a sheet or film here placed on the outer surface of the transparent support film 12.
• the semi-transparent layer 23 and the independent film are made for example in the form of a metallized polycarbonate sheet.
• This layer 23 and the window 11 have the same transmission properties as the adhesives described for the embodiment of FIG. 2.
• the display of the display elements is substantially identical to that obtained in the known display devices when the rear lighting is on and substantially different in the appearance when the rear lighting is off.
• the object of the present invention as described in connection with the various examples detailed above is a display device in which the alternation of the zones presenting the display elements and the zones having no display elements. not be visible. Thus, from an aesthetic point of view, no display element is visible except when the rear lighting is effective thus preserving the desired "black panel" effect.
• the present invention finds particular application in heating, ventilation and / or air conditioning systems and in particular in the field of motor vehicle equipment.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Liquid Crystal (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2007
  • 2007-08-28 FR FR0706033A patent/FR2920547B1/fr active Active
• 2008
  • 2008-08-28 BR BRPI0815925-4A2A patent/BRPI0815925A2/pt not_active IP Right Cessation
  • 2008-08-28 CN CN200880109212A patent/CN101809639A/zh active Pending
  • 2008-08-28 WO PCT/IB2008/003993 patent/WO2009090500A2/fr active Application Filing
  • 2008-08-28 KR KR1020107004527A patent/KR20100057628A/ko not_active Application Discontinuation
  • 2008-08-28 MX MX2010002303A patent/MX2010002303A/es not_active Application Discontinuation
  • 2008-08-28 EP EP08870674A patent/EP2183737A2/de not_active Withdrawn
  • 2008-08-28 US US12/675,477 patent/US20100302475A1/en not_active Abandoned
  • 2008-08-28 JP JP2010522473A patent/JP2012500995A/ja active Pending

Non-Patent Citations (1)

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