Classifications

• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F13/00—Illuminated signs; Luminous advertising
  • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
  • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
  • F21S45/40—Cooling of lighting devices
  • F21S45/49—Attachment of the cooling means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
  • B60K35/10—Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
• • 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
  • G02F1/1336—Illuminating devices
  • G02F1/133602—Direct backlight
  • G02F1/133603—Direct backlight with LEDs
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/14—Structural association of two or more printed circuits
  • H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
  • B60K2360/20—Optical features of instruments
  • B60K2360/33—Illumination features
  • B60K2360/34—Backlit symbols
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
  • B60K2360/40—Hardware adaptations for dashboards or instruments
  • B60K2360/42—Circuit board features
• • 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
  • G02F1/1336—Illuminating devices
  • G02F1/133628—Illuminating devices with cooling means
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
  • H05K2201/10007—Types of components
  • H05K2201/10106—Light emitting diode [LED]
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
  • H05K2201/10007—Types of components
  • H05K2201/10128—Display
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
  • H05K2201/10227—Other objects, e.g. metallic pieces
  • H05K2201/10356—Cables
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
  • H05K3/0061—Laminating printed circuit boards onto other substrates, e.g. metallic substrates onto a metallic substrate, e.g. a heat sink

Definitions

• the invention relates to a retrospective display screen. in particular integrated in a housing and intended to be incorporated in a vehicle dashboard,
• backlit screens by light sources such as light emitting diodes (LEDs).
• LEDs light emitting diodes
• These backlit screens comprise a housing enclosing most of the components of the display screen, said housing comprising a portion translucent dark forming a facade behind which is disposed at least one indicator such as a pictogram or transparent crystal screen, liquid.
• the facade has on its front face, that is to say facing the user, a glossy translucent paint,
• the housing is closed to ensure the darkness inside. Lighting from the outside produces a reflection masking the elements inside the case. In this way, the symbols and screens are visible only when the backlight is activated,
• the user can control through the display screen the navigation in menus and control vehicle functions such as air conditioning, the audio system or the navigation system,
• the backlighting of the display surface ie the rear-panel illumination, provides advantages in terms of ergonomics and integration possibilities.
• Black Panel a display screen using such a dark facade, technology known as the "black panel” (Black Panel) is, in the absence of backlight, perfectly united and therefore integrated into the cabin.
• a printed circuit board In the housing is a printed circuit board, on which are disposed the light-emitting diodes as well as the electronics controlling their illumination and the display on the liquid crystal screen.
• This printed circuit board generally comprises a printed circuit, disposed on each side of a support plate made of resin or polymers, and components are arranged on both sides of the support plate.
• the heat produced by the diodes is relatively poorly evacuated.
• the resin plates have a low thermal conductivity, so the heat produced by the components accumulates at the level of these, it is then created High temperature zones, located in the immediate vicinity of the heating components, known as "hot spots". The temperatures reached can disturb or even damage said components.
• the subject of the invention is a display screen comprising:
• At least one light-emitting diode forming a source of backlighting of the display surface, disposed on the printed circuit board,
• the printed circuit board is a single-sided printed circuit board
• the display screen comprises a heat-conducting plate disposed against the face of the printed circuit board opposite the face carrying the at least one a light-emitting diode, and in that it comprises a second double-sided printed circuit board having a lower surface area than the single-sided printed circuit board, connected to said single-sided printed circuit board by at least one electrical connection and carrying at least one control element of the backlighting of the display surface
• the display screen thus obtained allows a better distribution of the heat produced by the year minus a light source.
• the reduction of the double-sided printed circuit board surface used makes it possible to reduce the production cost of the display screen.
• the display screen may further have one or more of the following features, taken alone or in combination.
• the heat conducting plate is made of zamak.
• the heat-conducting plate is made of aluminum.
• the heat conductive plate is in contact with the outside of the housing by a convection surface.
• the double-sided printed circuit board has a bottom surface equal to about half of the area of the single-sided printed circuit board.
• the display screen has a copper thermal conduction layer disposed between the single-sided printed circuit board and the heat conductive plate.
• the double-sided printed circuit board is arranged on a support arranged on the heat-conducting plate.
• the convection surface of the heat conductive plate has vanes forming a heat sink.
• the display surface includes a liquid crystal display.
• the invention also relates to a combined display and control device for a motor vehicle, characterized in that it comprises a display screen according to at least one of the preceding claims and at least one control means of actuation of a function of the motor vehicle, and in that the operating state of the function of the motor vehicle is indicated by the display screen.
• FIG. 1 is a simplified diagram of a sectional view of a display screen according to the invention
• FIG. 2 is a partial sectional view of an alternative embodiment of the single-face printed circuit board of the display screen
• FIG. 3 is a simplified diagram of a sectional view of a variant of the display screen
• FIG. 4 is a front view of a combined display and control device, comprising a display screen according to the invention.
• the present invention relates to a display screen to be backlit.
• the invention relates to a display screen for a vehicle dashboard,
• the display screen 1 comprises a housing 3 forming an enclosure, in which is disposed a display surface 5, and a single-face printed circuit board 7, carrying a plurality of light sources 9.
• a second printed circuit board 11 carries a control unit 13 of the light sources 9 and of the display surface 5, as well as a connector 15, for connecting the display screen I to the vehicle electronics,
• the light sources 9 are light-emitting diodes, each of which is associated with a power matching circuit comprising at least one polarization resistor dissipating a large amount of heat in operation.
• the housing 3 forms an outer enclosure of the display surface 5 and has a facade 17 directed towards the user allowing the light to partially pass through, the facade 17 comprising on the front face a translucent paint, so that the display surface 5 is visible only when the display surface 5 is illuminated from its rear face by the light sources 9.
• the display surface 5 comprises for example a high-contrast liquid crystal screen (for example of the order of 200. ⁇ ), or a mask in which is made an opening of a shape that will be visible by the when the light sources 9 are on,
• the printed circuit board 7, on which the light sources 9 are disposed, is a single-sided printed circuit board.
• This first card 7 is disposed on a metal thennoconductive plate 19, its face having no printed circuit being in contact with said plate 1.
• the high thermal conductivity of the metallic material allows a better circulation of the heat produced by the light sources 9, which is then distributed uniformly over the entire volume of the plate 1,
• the heat-conducting plate 1 has d x lateral extensions 21a, 21b.
• These lateral extensions 2 ⁇ 21 b of the thermoconductive plate 19 are each directed towards an opening of the casing 3, the extensions 21a, 21b are in contact with the outside of the casing 3, and thus form a convection surface allowing the evacuation of the heat of the light sources 9 towards the outside of the housing 3.
• the two extensions 2. la, 21b are of corresponding shape to the associated openings, and close the housing 3 when in place,
• the heat-conducting plate 19 is for example made of Zamak, which is an alloy of zinc, aluminum, magnesium and copper. Zamak has a relatively low cost, is easily moldable and has a fairly good thermal conductivity. However, it is conceivable to make the heat-conducting plate 19 into another metal, such as aluminum, in particular by stamping,
• the second printed circuit board 11 serving as a support for the control unit 13 and the connector 15, is connected to the first printed circuit 7 by a bundle of electrical connections 23.
• the second printed circuit board 1 1 is double-sided printed circuit, that is to say having contact tracks printed on both sides, the double-sided printed circuit board 1 1 is of smaller size than the single-face printed circuit board 7, and is disposed at the rear of the latter, on a base 25 of the heat-conducting plate 19, formed on the face opposite to that on which the single-face printed circuit board 7 is arranged.
• the electrical connection beam 23 comprises in particular a plurality of cables connecting contacts of the printed circuits of the two cards 7, 1 1.
• the second printed circuit board 1 1 is less than about half the area of the first single-sided board 7.
• FIG. 2 An alternative embodiment, shown in FIG. 2, provides for placing between the printed circuit board 7 and the thermoconductive plate 19 a thermal conduction layer 27 made of copper forming a thermal bridge, at least on the surface portions above which Particularly heat-generating elements are arranged.
• a thermal conduction layer 27 made of copper forming a thermal bridge, at least on the surface portions above which Particularly heat-generating elements are arranged.
• Figure 3 is shown a variant of the display screen 1.
• the display screen 1 is similar to that of FIG. 1, but comprises on the part of the thermoconductive plate 19 forming the convection surface of the extensions 21a, 21b of the thermoconductive plate 19 of the parallel fins 29. These parallel fins 29 form heat sinks, or radiators, by increasing the convection surface and channeling the airflow.
• the invention also relates to a combined display and control device for a motor vehicle, comprising a display screen 1 as previously described. Such a combined assembly is shown in FIG.
• the combined assembly 31 shown illustrates different modes of use of a display screen 1 according to the invention.
• the combined assembly 31 comprises a plurality of display surfaces 5a, 5b, 5c, 5d, 5e, 5f located behind a translucent facade 17 and associated with control members 33, 35, 37 corresponding to FIG. different vehicle functions.
• the combined assembly 31 comprises a liquid crystal screen 5a, which can display characters, for example to indicate a temperature or an audio track number to the user.
• the combined assembly 31 may also comprise a rotary knob 33, intended to be rotated by the user. This rotary knob 33 comprises on its front face a display surface 5b comprising a backlit pictogram, allowing the user to locate said rotary knob 33 in the dark.
• a plurality of indicator display surfaces 5c can indicate the operating status of a function such as the audio volume, or the operating power of the air conditioning.
• the indicators 5c light up in increasing numbers when for example the audio volume is increased or the power of the air conditioning is increased.
• a second plurality of indicator display surfaces 5d can be used to indicate the engagement state of functions associated with a plurality of push buttons 35.
• a flag 5d corresponds to each button 35, said flag 5d. being illuminated when the function of the associated button 35 is engaged.
• the combined assembly 31 further comprises a touch-sensitive surface 37, using for example a capacitive or resistive transparent film or else piezoelectric sensors recording a deformation of the facade 17.
• Associated display surfaces 5e delimit the periphery of said touch surface 37
• Additional display surfaces 5f make it possible to identify the function of the touch surface 37, in this case these additional surfaces 5f represent directional arrows for navigation in a menu.
• the touch screen 1 obtained according to the invention comprises means for evacuating the heat produced by the backlighting device, whose light sources 9 must be of high power because of the presence of the translucent and dark facade 17 .

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Nonlinear Science (AREA)
• Transportation (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Mathematical Physics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Instrument Panels (AREA)
• Illuminated Signs And Luminous Advertising (AREA)
• Structure Of Printed Boards (AREA)
• Combinations Of Printed Boards (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43897076

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (27)

• 2010
  • 2010-11-10 FR FR1004406A patent/FR2967329B1/fr active Active
• 2011
  • 2011-11-10 US US13/883,831 patent/US9523476B2/en active Active
  • 2011-11-10 CN CN201180064434.2A patent/CN103385039B/zh active Active
  • 2011-11-10 JP JP2013538248A patent/JP2013545140A/ja active Pending
  • 2011-11-10 EP EP11794528.7A patent/EP2638789A2/fr not_active Ceased
  • 2011-11-10 WO PCT/FR2011/000599 patent/WO2012062981A2/fr active Application Filing

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events