EP2638789A2 - Display screen - Google Patents

Display screen

Info

Publication number
EP2638789A2
EP2638789A2 EP11794528.7A EP11794528A EP2638789A2 EP 2638789 A2 EP2638789 A2 EP 2638789A2 EP 11794528 A EP11794528 A EP 11794528A EP 2638789 A2 EP2638789 A2 EP 2638789A2
Authority
EP
European Patent Office
Prior art keywords
printed circuit
circuit board
display screen
display
face
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.)
Ceased
Application number
EP11794528.7A
Other languages
German (de)
French (fr)
Inventor
Tan Duc Huynh
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.)
Valeo Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
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 Valeo Systemes Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Publication of EP2638789A2 publication Critical patent/EP2638789A2/en
Ceased legal-status Critical Current

Links

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—Arrangement of adaptations of instruments
    • B60K35/10—
    • 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
    • B60K2360/34—
    • B60K2360/42—
    • 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 .

Abstract

The invention relates to a display screen comprising: a housing forming an enclosure; a display surface on the front face of the housing; a printed circuit board arranged inside the housing; and at least one light-emitting diode that forms a back-lighting source for the display surface and is arranged on a face of the printed circuit board. The display screen is characterised in that the printed circuit board is a single-face printed circuit board, the display screen comprises a thermoconductive plate arranged against the face of the printed circuit board opposite the one carrying the at least one light-emitting diode, and the display screen also comprises a second double-face printed circuit board that has a smaller surface than the single-face printed circuit board, is connected to said single-face printed circuit board by at least one electrical connection, and carries at least one element for controlling the back-lighting of the display surface.

Description

Écran d'affichage  Display screen
L'invention concerne un écran d'affichage rétrû-éckiiré. en particulier intégré dans un boîtier et destiné à être incorporé dans un tableau de bord de véhicule, The invention relates to a retrospective display screen. in particular integrated in a housing and intended to be incorporated in a vehicle dashboard,
Il est connu de réaliser des écrans rétro-éclairés par des sources lumineuses telles que des diodes électroluminescentes (DEL), Ces écrans rétro-éclairés comprennent un boîtier renfermant la majeure partie des composants de l'écran d'affichage, ledit boîtier comportant une partie translucide sombre formant une façade derrière laquelle est disposé au moins un indicateur tel qu'un pictogramme ou un écran transparent à cristaux, liquides. It is known to produce backlit screens by light sources such as light emitting diodes (LEDs). 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.
La façade comporte sur sa face avant, c'est-à-dire orientée vers l'utilisateur, une peinture translucide brillante, Le boîtier est fermé afin de garantir l'obscurité à l'intérieur. Un éclairage de l'extérieur produit un reflet masquant les éléments à l'intérieur du boîtier. De la sorte, les symboles et écrans ne sont visibles que lorsque le rétro-éclairage est activé, 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,
En combinaison avec au moins un bouton de commande, l'utilisateur peut contrôler via l'écran d'affichage la navigation dans des menus et piloter des fonctions du véhicule telles que la climatisation, le système audio ou encore le système de navigation, In combination with at least one control button, 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,
Le rétro-éclairage de la surface d'affichage, c'est à dire l'éclairage par la face arrière apporte des avantages en termes d'ergonomie et de possibilités d'intégration.  The backlighting of the display surface, ie the rear-panel illumination, provides advantages in terms of ergonomics and integration possibilities.
En effet un écran d'affichage utilisant une telle façade sombre, technologie connue sous le nom de « panneau noir » (Black Panel), est, en l'absence de rétroéclairage, parfaitement uni et donc intégré dans l'habitacle.  Indeed 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.
Dans le boîtier se trouve une carte à circuit imprimé, sur laquelle sont disposées les diodes électroluminescentes ainsi que l'électronique contrôlant leur éclairage et l'affichage sur l'écran à cristaux liquides. Cette carte à circuit imprimé comporte généralement un circuit imprimé, disposé sur chaque face d'une plaque de support en résine ou polymères, et des composants sont disposés des deux côtés de la plaque de support. 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.
Le boîtier étant fermé, la chaleur produite par les diodes est relativement mal évacuée, En particulier, les plaques en résine présentent une faible conductivité thermique, aussi la chaleur produite par les composants s'accumule au niveau de ceux- ci, II se crée alors des 2ones de haute température, situées dans Le voisinage immédiat des composants chauffants, connues sous le nom de « points chauds » (hot spots). Les ' températures atteintes peuvent perturber voire endommager lesdits composants.  The housing being closed, the heat produced by the diodes is relatively poorly evacuated. In particular, 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.
Afin de remédier au moins partiellement aux inconvénients précédemment cités, l'invention a pour objet un écran d'affichage comportant : In order to at least partially overcome the aforementioned drawbacks, the subject of the invention is a display screen comprising:
- un boîtier formant enceinte,  a housing forming a speaker,
- une surface d'affichage sur la face avant du boîtier,  a display surface on the front face of the housing,
- Une carte à circuit imprimé disposée à l'intérieur du boîtier,  - A printed circuit board disposed inside the housing,
- au moins une diode électroluminescente formant une source de rétro-éclairage de la surface d'affichage, disposée sur la carte à circuit imprimé,  at least one light-emitting diode forming a source of backlighting of the display surface, disposed on the printed circuit board,
caractérisé en ce que la carte à circuit imprimé est une carte à circuit imprimé simple-face, en ce que l'écran d'affichage comporte une plaque thermoconductrice disposée contre la face de la carte à circuit imprimé opposée à la face portant la au moins une diode électroluminescente, et en ce qu'il comporte une seconde carte à circuit imprimé double-face, de surface inférieure à la carte à circuit imprimé simple- face, reliée à ladite carte a circuit imprimé simple-face par au moins une connexion électrique et portant au moins un élément de contrôle du rétro-éclairage de la surface d'affichage,  characterized in that the printed circuit board is a single-sided printed circuit board, in that 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,
L'écran d'affichage ainsi obtenu permet une meilleure répartition de la chaleur produite par la an moins une source lumineuse. De plus, la réduction de la surface de carte à circuit imprimé double face utilisé permet de réduire le coût de production de l'écran d'affichage. L'écran d'affichage peut en outre présenter une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison. The display screen thus obtained allows a better distribution of the heat produced by the year minus a light source. In addition, 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.
La plaque thermoconductrice est en zamak.  The heat conducting plate is made of zamak.
La plaque thermoconductrice est en aluminium.  The heat-conducting plate is made of aluminum.
La plaque thermoconductrice est en contact avec l'extérieur du boîtier par une surface de convection.  The heat conductive plate is in contact with the outside of the housing by a convection surface.
La carte à circuit imprimé double-face est de surface inférieure on égale à environ la moitié de la surface de la carte à circuit imprimé simple-face.  The double-sided printed circuit board has a bottom surface equal to about half of the area of the single-sided printed circuit board.
L'écran d'affichage comporte une couche de conduction thermique en cuivre disposée entre la carte à circuit imprimé simple-face et la plaque thermoconductrice.  The display screen has a copper thermal conduction layer disposed between the single-sided printed circuit board and the heat conductive plate.
La carte à circuit imprimé double-face est disposée sur un support aménagé sur la plaque thermoconductrice.  The double-sided printed circuit board is arranged on a support arranged on the heat-conducting plate.
La surface de convection de la plaque thermoconductrice comporte des ailettes formant un dissipateur thermique.  The convection surface of the heat conductive plate has vanes forming a heat sink.
La surface d'affichage comprend un écran à cristaux liquides.  The display surface includes a liquid crystal display.
L'invention a aussi pour objet un dispositif combiné d'affichage et de commande po r véhicule automobile, caractérisé en ce qu'il comporte un écran d'affichage selon l'une au moins des revendications précédentes et au moins un moyen de contrôle de l'actionnement d'une fonction du véhicule automobile, et en ce que l'état d'actionnement de la fonction du véhicule automobile est indiqué par l'écran d'affichage. 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.
D'autres avantages et caractéristiques apparaîtront à la lecture de la description des figures suivantes, parmi lesquelles : Other advantages and characteristics will appear on reading the description of the following figures, among which:
- la figure 1 est un schéma simplifié d'une vue en coupe d'un écran d'affichage selon l'invention,  FIG. 1 is a simplified diagram of a sectional view of a display screen according to the invention,
- la figure 2 est une vue en coupe partielle d'un mode de réalisation alternatif de la carte à circuit imprimé simple-face de l'écran d'affichage,  FIG. 2 is a partial sectional view of an alternative embodiment of the single-face printed circuit board of the display screen,
- la figure 3 est un schéma simplifié d'une vue en coupe d'une variante de l'écran d'affichage, - la figure 4 est une vue de face d'un dispositif combiné d'affichage et de commande, comprenant un écran d'affichage selon l'invention. 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.
Sur toutes les figures, les mêmes références se rapportent aux mêmes éléments. In all the figures, the same references refer to the same elements.
La présente invention concerne un écran d'affichage destiné à être rétro-éclairé. En particulier, l'invention concerne un écran d'affichage pour tableau de bord de véhicule, The present invention relates to a display screen to be backlit. In particular, the invention relates to a display screen for a vehicle dashboard,
Sur la figure 1, on peut voir que l'écran d'affichage 1 comporte un boîtier 3 formant une enceinte, dans lequel est disposé une surface d'affichage 5, et une carte à circuit imprimé simple-face 7, portant une pluralité de sources lumineuses 9. Une seconde carte à circuit imprimé 1 1 porte une unité de contrôle 13 des sources lumineuses 9 et de la surface d'affichage 5, ainsi qu'un connecteur 15, destiné à relier l'écran d'affichage I à l'électronique du véhicule,  In FIG. 1, it can be seen that 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,
Les sources lumineuses 9 sont des diodes électroluminescentes, à chacune desquelles est associé un circuit d'adaptation de puissance comprenant au moins un résister de polarisation, dissipant une quantité importante de chaleur en fonctionnement.  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.
Le boîtier 3 forme une enceinte extérieure de la surface d'affichage 5 et comporte une façade 17 dirigée vers l'utilisateur laissant partiellement passer la lumière, la façade 17 comportant en face avant une peinture translucide, de sorte que la surface d'affichage 5 soit visible uniquement lorsque la surface d'affichage 5 est éclairée depuis sa face arrière par les sources lumineuses 9.  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.
La surface d'affichage 5 comporte par exemple un écran à cristaux liquide de fort contraste (par exemple de l'ordre de 200.Ί), ou bien un masque dans lequel est pratiqué une ouverture d'une forme qui sera visible par l'utilisateur lorsque les sources lumineuses 9 sont allumées,  The display surface 5 comprises for example a high-contrast liquid crystal screen (for example of the order of 200.Ί), 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,
La carte à circuit imprimé 7, sur laquelle les sources lumineuses 9 sont disposées, est une carte à circuit imprimé simple-face. Cette première carte 7 est disposée sur une plaque thennoconductrice 19 métallique, sa face ne comportant pas de circuit imprimé étant au contact de ladite plaque 1 . S 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. S
La forte conductivité thermique du matériau métallique permet une meilleure circulation de la chaleur produite par les sources lumineuses 9, qui est alors répartie uniformément sur tout le volume de la plaque 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,
En outre, la plaque thermoconductrice 1 comporte d x prolongements latéraux 21a, 21b. Ces prolongements latéraux 2\ 21 b de la plaque thermoconductrice 19 sont dirigés chacun vers une ouverture du bottier 3 , Les prolongements 21a, 21b sont en contact avec l'extérieur du boîtier 3, et forment ainsi une surface de convection permettant l'évacuation de la chaleur des sources lumineuses 9 vers l'extérieur du boîtier 3.  In addition, 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.
Les deux prolongements 2. la, 21b sont de forme correspondante aux ouvertures associées, et ferment le boîtier 3 lorsqu'ils sont en place,  The two extensions 2. la, 21b are of corresponding shape to the associated openings, and close the housing 3 when in place,
La plaque thermoconductrice 19 est par exemple réalisée en Zamak, qui est un alliage de zinc, aluminium, magnésium et cuivre, Le Zamak a un coût relativement faible, est aisément moulable et présente une assez bonne conductivité thermique. Cependant, il est envisageable de réaliser la plaque thermoconductrice 19 en un autre métal, tel que de l'aluminium, notamment par emboutissage,  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,
La seconde carte à circuit imprimé 11 servant de support à l'unité de contrôle 13 et au connecteur 15, est reliée au premier circuit imprimé 7 par un faisceau de connexions électriques 23. La seconde carte à circuit imprimé 1 1 est «ne carte à circuit imprimé double-face, c'est-à-dire ayant des pistes de contacts imprimées sur ses deux faces, La carte à circuit imprimé double-face 1 1 est de taille inférieure à la carte à circuit imprimé simple-face 7, et est disposée à l'arrière de celle-ci, sur un socle 25 de la plaque thermoconductrice 19, formé sur la face opposée à celle sur laquelle est disposée la carte à circuit imprimé simple-face 7, Le faisceau de connexions électriques 23 comporte notamment une pluralité de câbles reliant des contacts des circuit imprimé des deux cartes 7, 1 1.  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.
En particulier, la seconde carte à circuit imprimé 1 1 est de taille inférieure à environ la moitié de la surface de la première carte 7 simple-face. Une carte à circuit imprimé double-face ayant un prix par unité de surface valant environ le double de celui d'une carte à circuit imprimé simple-face, le coût global des deux cartes, première 7 simple-face et seconde 11 double-face, est environ le même, voire inférieur, que celui d'une seule carte double-face de taille comparable à celle de la première 7 comme on en utilise usuellement. In particular, the second printed circuit board 1 1 is less than about half the area of the first single-sided board 7. A double-sided printed circuit board having a price per unit area approximately double that of a single-sided printed circuit board, the overall cost of the two cards, first 7 single-sided and second 11 double-sided , is about the same, or even lower, than the one a single double-sided card of comparable size to that of the first 7 as is usually used.
Un mode de réalisation alternatif, représenté en figure 2, prévoit de disposer entre carte à circuit imprimé 7 et la plaque thermoconductrice 19 une couche de conduction thermique 27 en cuivre formant un pont thermique, au moins sur les portions de surface an-dessus desquelles sont disposés des éléments particulièrement générateurs de chaleur, Par vissage de la carte à circuit imprimé 7 sur la plaque thermoconductrice 19, la couche de conduction thermique 27 est pressée contre la carte à circuit imprimé 7, dont la couche de support en fibres préimprégnées se déforme légèrement, 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. By screwing the printed circuit board 7 onto the heat-conducting plate 19, the heat conduction layer 27 is pressed against the printed circuit board 7, the pre-impregnated fiber support layer of which deforms slightly. ,
Sur la figure 3 est représentée une variante de l'écran d'affichage 1. In Figure 3 is shown a variant of the display screen 1.
L'écran d'affichage 1 est semblable à celui de la figure 1, mais comporte sur la partie de la plaque thermoconductrice 19 formant surface de convection des prolongements 21a, 21b de la plaque thermoconductrice 19 des ailettes parallèles 29. Ces ailettes parallèles 29 forment des dissipateurs thermiques, ou radiateurs, en augmentant la surface de convection et en canalisant le flux d'air. L'invention a aussi pour objet un dispositif combiné d'affichage et de commande pour véhicule automobile, comportant un écran d'affichage 1 tel que précédemment décrit. Un tel ensemble combiné est représenté en figure 4.  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.
L'ensemble combiné 31 représenté illustre différents modes d'utilisation d'un écran d'affichage 1 selon l'invention.  The combined assembly 31 shown illustrates different modes of use of a display screen 1 according to the invention.
Sur cette figure 4, l'ensemble combiné 31 comporte plusieurs surfaces d'affichage 5a, 5b, 5c, 5d, 5e, 5f, situées derrière une façade 17 translucide, et auxquelles sont associés des organes de commande 33, 35, 37 correspondant à différentes fonctions véhicule. L'ensemble combiné 31 comporte un écran à cristaux liquide 5a, pouvant afficher des caractères, pour par exemple indiquer une température ou un numéro de piste audio à l'utilisateur. L'ensemble combiné 31 peut aussi comporter un bouton rotatif 33, destiné à être mis en rotation par l'utilisateur, Ce bouton rotatif 33 comporte sur sa face avant une surface d'affichage 5b comportant un pictogramme rétro-éclairé, permettant à l'utilisateur de localiser ledit bouton rotatif 33 dans l'obscurité. In this FIG. 4, 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.
Une pluralité de surfaces d'affichage formant des indicateurs 5c peut indiquer l'état de fonctionnement d'une fonction telle que le volume audio, ou la puissance de fonctionnement de la climatisation. Dans l'exemple ici développé, les indicateurs 5c s'éclairent en nombre croissant lorsque par exemple le volume audio est augmenté ou la puissance de la climatisation est augmentée.  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. In the example developed here, 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.
Une seconde pluralité de surfaces d'affichage formant des indicateurs 5d peut être utilisée pour indiquer l'état d'enclenchement de fonctions associées à une pluralité de boutons poussoirs 35. Dans cet exemple, un indicateur 5d correspond à chaque bouton 35, ledit indicateur 5d étant éclairé lorsque la fonction du bouton 35 associé est enclenchée.  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. In this example, a flag 5d corresponds to each button 35, said flag 5d. being illuminated when the function of the associated button 35 is engaged.
L'ensemble combiné 31 comporte en outre une surface tactile 37, utilisant par exemple un film transparent capacitif ou résistif ou bien des capteurs piézoélectriques enregistrant une déformation de la façade 17. Des surfaces d'affichage associées 5e délimitent le pourtour de ladite surface tactile 37. Des surfaces d'affichage supplémentaires 5f permettent d'identifier la fonction de la surface tactile 37, dans le cas présent ces surfaces supplémentaires 5f représentent des flèches directionnelles pour la navigation dans un menu.  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.
L'écran tactile 1 obtenu selon l'invention comporte des moyens d'évacuation de la chaleur produite par le dispositif de rétro-éclairage, dont les sources lumineuses 9 doivent être de forte puissance du fait de la présence de la façade 17 translucide et sombre. 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 .
De plus, en réduisant la surface de carte à circuit imprimé double-face 11 utilisée, une partie du coût engendré par le dispositif d'évacuation de la chaleur est compensée.  In addition, by reducing the double-sided printed circuit board surface 11 used, part of the cost generated by the heat dissipating device is compensated.

Claims

REVENDICATIONS
1. Écran d'affichage (1) comportant : 1. Display screen (1) comprising:
- un boîtier formant enceinte (3),  a housing forming an enclosure (3),
- une surface d'affichage (5) sur la face avant du boîtier (3),  a display surface (5) on the front face of the housing (3),
- une carte à circuit imprimé (7) disposée à l'intérieur du boîtier (3),  a printed circuit board (7) disposed inside the housing (3),
- au moins une diode électroluminescente (9) formant une source de rétroéclairage de la surface d'affichage (5), disposée sur une face de la carte à circuit imprimé (7),  at least one light-emitting diode (9) forming a backlighting source of the display surface (5), disposed on one face of the printed circuit board (7),
caractérisé en ce que la carte à circuit imprimé (7) est une carte à circuit imprimé simple-face, en ce que l'écran d'affichage (1) comporte une plaque thermoconductrice (19) disposée contre la face de la carte à circuit imprimé (7) opposée à celle portant la au moins une diode électroluminescente (9), et en ce qu'il comporte une seconde carte à circuit imprimé (11) double-face, de surface inférieure à la carte à circuit imprimé simple-face (7), reliée à ladite carte à circuit imprimé simple-face (7) par au moins une connexion électrique (23) et portant au moins un élément de contrôle (13, 15) du rétro-éclairage de la surface d'affichage (5).  characterized in that the printed circuit board (7) is a single-sided printed circuit board, in that the display screen (1) comprises a heat-conducting plate (19) disposed against the face of the circuit board printed circuit (7) opposite to that carrying the at least one light-emitting diode (9), and in that it comprises a second double-sided printed circuit board (11) of lower surface area than the single-sided printed circuit board (7), connected to said single-face printed circuit board (7) by at least one electrical connection (23) and carrying at least one control element (13, 15) of the backlighting of the display surface ( 5).
2. Écran d'affichage selon la revendication 1, caractérisé en ce que la plaque thermoconductrice (1 ) est en zamak. 2. Display screen according to claim 1, characterized in that the heat conductive plate (1) is zamak.
3. Écran d'affichage selon la revendication 1, caractérisé en ce que la plaque thermoconductrice (1 ) est en aluminium. 3. Display screen according to claim 1, characterized in that the heat-conducting plate (1) is aluminum.
4. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que la plaque thermoconductrice (19) est en contact avec l'extérieur du boîtier (3) par une surface de convection, Display screen according to at least one of the preceding claims, characterized in that the heat-conducting plate (19) is in contact with the outside of the housing (3) via a convection surface,
5. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que la carte à circuit imprimé double-face (11) est de surface inférieure on égale à environ la moitié de la surface de la carte à circuit imprimé simple-face (7). 5. Display screen according to at least one of the preceding claims, characterized in that the double-sided printed circuit board (11) is of lower surface area equal to about half of the surface of the printed circuit board single-sided (7).
5 6. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que la carte à circuit imprimé double-face (1 1) est disposée sur un socle (25) aménagé sur la plaque thermoconductrice (1 ). Display screen according to at least one of the preceding claims, characterized in that the double-sided printed circuit board (1 1) is arranged on a base (25) arranged on the thermoconductive plate (1).
7. Écra d'affichage selon l'une au moins des revendications précédentes, caractérisé 10 en ce qu'il comporte une couche de conduction thermique (27) en cuivre disposée entre la carte à circuit imprimé simple-face (7) et la plaque thermoconductrice (19). Display screen according to at least one of the preceding claims, characterized in that it comprises a copper heat conduction layer (27) disposed between the single-sided printed circuit board (7) and the plate thermoconductive (19).
8. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que la surface de convection (21a, 21b) de la plaque thermoconductrice (19)8. Display according to at least one of the preceding claims, characterized in that the convection surface (21a, 21b) of the heat-conducting plate (19)
15 comporte des ailettes (29) formant un dissipateur thermique, 15 has fins (29) forming a heat sink,
9. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que la surface d'affichage (5) comprend un écran à cristaux liquides (5a). 9. Display screen according to at least one of the preceding claims, characterized in that the display surface (5) comprises a liquid crystal screen (5a).
20 10. Écran d'affichage selon l'une au moins des revendications précédentes, caractérisé en ce que le boîtier (3) comporte une façade (17) laissant partiellement passer la lumière de sorte que la surface d'affichage (5) soit visible uniquement lorsqu'elle est éclairée depuis sa face arrière par la au moins une diode électroluminescente (9). 10. Display screen according to at least one of the preceding claims, characterized in that the housing (3) has a front (17) allowing the light to pass partially so that the display surface (5) is visible. only when it is illuminated from its rear face by the at least one light-emitting diode (9).
25 11. Écran d'affichage selon la revendication précédente, caractérisé en ce que la façade (17) comporte une peinture translucide en face avant. 11. Display screen according to the preceding claim, characterized in that the front (17) comprises a translucent paint on the front face.
12. Dispositif combiné d'affichage et de commande (31) pour véhicule automobile, caractérisé en ce qu'il comporte un écran d'affichage (1) selon l'une au moins des 30 revendications précédentes et au moins un moyen de contrôle de l'actionnement (33, , 37) d'une fonction du véhicule automobile, et en ce que l'état d'actionnement de fonction du véhicule automobile est indiqué par l'écran d'affichage (1), 12. A combined display and control device (31) for a motor vehicle, characterized in that it comprises a display screen (1) according to at least one of the preceding claims and at least one control means of the actuation (33, , 37) of a function of the motor vehicle, and in that the operating state of the motor vehicle is indicated by the display screen (1),
EP11794528.7A 2010-11-10 2011-11-10 Display screen Ceased EP2638789A2 (en)

Applications Claiming Priority (2)

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FR1004406A FR2967329B1 (en) 2010-11-10 2010-11-10 DISPLAY SCREEN
PCT/FR2011/000599 WO2012062981A2 (en) 2010-11-10 2011-11-10 Display screen

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US (1) US9523476B2 (en)
EP (1) EP2638789A2 (en)
JP (1) JP2013545140A (en)
CN (1) CN103385039B (en)
FR (1) FR2967329B1 (en)
WO (1) WO2012062981A2 (en)

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US20130242591A1 (en) 2013-09-19
WO2012062981A2 (en) 2012-05-18
CN103385039B (en) 2017-07-21
FR2967329A1 (en) 2012-05-11
US9523476B2 (en) 2016-12-20
WO2012062981A3 (en) 2012-07-19
CN103385039A (en) 2013-11-06
FR2967329B1 (en) 2013-04-26
JP2013545140A (en) 2013-12-19

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