WO2016027812A1 - On-board display apparatus - Google Patents
On-board display apparatus Download PDFInfo
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- WO2016027812A1 WO2016027812A1 PCT/JP2015/073154 JP2015073154W WO2016027812A1 WO 2016027812 A1 WO2016027812 A1 WO 2016027812A1 JP 2015073154 W JP2015073154 W JP 2015073154W WO 2016027812 A1 WO2016027812 A1 WO 2016027812A1
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- WIPO (PCT)
- Prior art keywords
- cover glass
- layer
- display device
- display panel
- thickness
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10128—Treatment of at least one glass sheet
- B32B17/10137—Chemical strengthening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10366—Reinforcements of the laminated safety glass or glazing against impact or intrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/007—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in gaseous phase
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- 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
- G02F1/011—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 in optical waveguides, not otherwise provided for in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
Definitions
- the present invention relates to an on-vehicle display device.
- Patent Document 1 describes a transparent surface material with an adhesive layer having an adhesive layer formed on the surface.
- a vehicle-mounted display device such as a car navigation device is mounted on a vehicle such as an automobile.
- Examples of the type of the in-vehicle display device include an on-dash type standing outside the dashboard, an in-dash type embedded in the dashboard, and the like.
- a transparent protective member such as a film or glass is used from the viewpoint of protecting the display panel.
- a protective member made of glass (cover glass) instead of a film is used from the viewpoint of texture. Is desired.
- laminated glass tends to be thick and easily causes design problems. Further, since the cost is high, use of tempered glass is required.
- the in-vehicle display device cover glass is required to have excellent impact resistance so that it does not break even if a passenger's head hits when a vehicle collision accident occurs.
- high impact resistance is required for the cover glass.
- the present invention has been made in view of the above points, and an object thereof is to provide an on-vehicle display device having excellent impact resistance of a cover glass.
- An in-vehicle display device is an in-vehicle display device configured by stacking members up to the n-th layer using a surface cover glass as a first layer, and the cover glass has a plate thickness.
- the tempered glass is 0.5 to 2.5 mm and the thickness of the surface compressive stress layer is 10 ⁇ m or more, and the in-vehicle display device is an in-vehicle display device that satisfies the following formula (I).
- E 1 Young's modulus of the cover glass (unit: GPa)
- t 1 thickness of the cover glass (Unit: mm)
- E n Young's modulus (unit: GPa) of the n-th layer member
- t n n-th layer thickness (unit: mm)
- n is an integer of 2 or more.
- FIG. 5 is a sectional view taken along line AA in FIG. 4. It is a top view which shows a test body. It is the graph which plotted the evaluation result of impact resistance.
- FIG. 1 is a schematic cross-sectional view showing a cover glass with an adhesive layer.
- a cover glass with an adhesive layer is manufactured and bonded to a display panel.
- the method for manufacturing the in-vehicle display device is not limited thereto.
- the cover glass and the display panel may be bonded via an OCA (Optically Clear Adhesive) film or the like.
- a cover glass 10 with an adhesive layer shown in FIG. 1 includes a transparent cover glass 12, an adhesive layer 14, a protective film 16, and a light shielding part 20.
- the adhesive layer 14 is provided on the cover glass 12.
- the cover glass 12 has a light shielding portion 20 formed at the peripheral edge 12 b, and an adhesive layer 14 is formed on the first main surface 12 c of the cover glass 12.
- the shape of the cover glass 12 and the adhesive layer 14 is, for example, a rectangular shape in plan view, and the adhesive layer 14 has a smaller outer shape.
- the adhesive layer 14 is disposed with its center aligned with the cover glass 12.
- the light shielding unit 20 is configured to conceal wiring members connected to the display panel other than the display surface (display area) of the display panel, which will be described later, from being visible from the second main surface 12d side of the cover glass 12. .
- the light shielding portion 20 is not necessarily provided.
- a protective film 16 covering the entire surface of the cover glass 12 is detachably provided on the first main surface 14a of the adhesive layer 14.
- the protective film 16 is peeled off. In this case, for example, a cut is made in the first main surface 16a of the protective film 16, and the protective film 16 is peeled off.
- the protective film 16 is not particularly limited, and for example, a relatively flexible film such as polyethylene or polypropylene is used.
- the cover glass 12 protects the display surface (display region) of the in-vehicle display device, and is usually a plate-like body (glass plate) having a flat shape or a curved surface.
- the cover glass 12 has a thickness of 0.5 to 2.5 mm. If the plate thickness is less than 0.5 mm, the strength of the cover glass 12 itself is insufficient, and the impact resistance of the cover glass 10 with the adhesive layer may be reduced. On the other hand, if the plate thickness exceeds 2.5 mm, the plate becomes too thick, and is unsuitable for use in an in-vehicle display device from the viewpoint of design.
- the outer shape and size of the cover glass 12 are larger than those of the display panel from the viewpoint of design, sensor attachment, and attachment to the display module.
- the shape of the cover glass 12 determines suitably according to a vehicle-mounted display apparatus on a design.
- various in-vehicle display devices such as a rectangle and a trapezoid.
- the outer shape of the cover glass 12 is often equivalent to the outer shape of the in-vehicle display device.
- a cover glass 12 that covers the entire display surface of the display panel and that includes a curve in the outer shape can also be used.
- the size of the cover glass 12 for example, in the case of a rectangle, the longitudinal direction: 100 to 800 mm and the short side direction: 40 to 300 mm can be mentioned.
- the cover glass 12 for example, a colorless and transparent plate-like tempered glass in which soda lime glass or aluminosilicate glass (SiO 2 —Al 2 O 3 —Na 2 O glass) is tempered.
- soda lime glass or aluminosilicate glass SiO 2 —Al 2 O 3 —Na 2 O glass
- chemically tempered glass for example, “Dragon Trail (registered trademark)” manufactured by Asahi Glass Co., Ltd.
- the glass material constituting the cover glass 12 is, for example, in mol%, SiO 2 50 to 80%, Al 2 O 3 1 to 20%, Na 2 O 6 to 20%, K 2 O.
- a compressive stress layer is formed on both sides thereof, and the thickness of the surface compressive stress layer is 10 ⁇ m or more, preferably 15 ⁇ m or more, more preferably 25 ⁇ m or more, More preferably, it is 30 ⁇ m or more. Further, the surface compressive stress in the surface compressive stress layer is preferably 650 MPa or more, and more preferably 750 MPa or more.
- the method of subjecting the cover glass 12 to chemical strengthening includes a method in which the cover glass 12 is immersed in KNO 3 molten salt, subjected to ion exchange treatment, and then cooled to around room temperature.
- the processing conditions such as the temperature and immersion time of the KNO 3 molten salt may be set so that the surface compressive stress and the thickness of the surface compressive stress layer have desired values.
- the adhesive layer 14 is for bonding the cover glass 12 to the in-vehicle display device when the cover glass 12 is bonded to the in-vehicle display device.
- the adhesive layer 14 is transparent like the cover glass 12, and the refractive index difference between the cover glass 12 and the adhesive layer 14 is preferably small.
- the adhesive layer 14 include a layer made of a transparent resin obtained by curing a liquid curable resin composition.
- a curable resin composition a photocurable resin composition, a thermosetting resin composition, etc. are mentioned, for example, Especially, the photocurable resin composition containing a curable compound and a photoinitiator is preferable.
- the photocurable resin composition for layered part formation of patent document 1 is mentioned suitably, for example.
- the adhesive layer 14 may be bonded to OCA or the like separately cured in a film shape on the cover glass 12.
- the thickness of the pressure-sensitive adhesive layer 14 is, for example, preferably 5 to 400 ⁇ m, and more preferably 50 to 200 ⁇ m. Further, the storage shear modulus of the adhesive layer 14 at a temperature of 25 ° C. is preferably, for example, 5 kPa to 5 MPa, and more preferably 1 MPa to 30 MPa.
- a film material (not shown) is attached to the surface of the curable resin composition film.
- the film material is cut to become the protective film 16 as described later.
- the curable resin composition film was protected by the film material by curing the curable resin composition film by photocuring treatment or thermosetting treatment.
- a laminate is obtained.
- the position which becomes the side surface 14b of the adhesion layer 14 is set as a cutting line, and the laminated body is cut by the cutting line using a laser beam.
- the cover glass 10 with the adhesion layer by which the protective film 16 was provided in the 1st main surface 14a of the adhesion layer 14 is obtained.
- a cutting process may be abbreviate
- FIG. 2 is a schematic cross-sectional view showing the in-vehicle display device 100.
- the in-vehicle display device 100 has a concave housing 106.
- a backlight unit 102 is placed on a housing bottom member 107 that is a bottom plate of the housing 106, and a display panel 104 is placed on the backlight unit 102.
- the backlight unit 102 and the display panel 104 are housed in the housing 106.
- An opening 108 is formed in the housing 106, and the display panel 104 is disposed on the opening 108 side.
- a region corresponding to the opening 108 of the display panel 104 is a display surface 104a.
- the display panel module 100a is configured with the backlight 102 and the display panel 104 as main components.
- the backlight unit 102 is generally composed of a lens sheet, a diffusion sheet, a light guide plate, a lamp, a reflector, and the like.
- the light guide plate is the thickest of these, and the overall rigidity of the backlight unit is increased. It is the main component in deciding.
- the thickness of the light guide plate is preferably 10 mm or less, more preferably 7 mm or less, and even more preferably 5 mm or less. This is to achieve a thinner casing by narrowing the frame.
- the thickness of the light guide plate is preferably 1 mm or more, more preferably 2 mm or more, and further preferably 4 mm or more. This is to prevent the light guide plate from being damaged by bending stress when an impact is applied to the backlight unit.
- the Young's modulus of the material forming the light guide plate is preferably 1 GPa or more, more preferably 2 GPa or more, further preferably 3 GPa or more, and particularly preferably 60 GPa or more. This is to improve the impact resistance of the cover glass.
- the linear expansion coefficient of the material forming the light guide plate is preferably 800 ⁇ 10 ⁇ 7 / ° C. or less, more preferably 600 ⁇ 10 ⁇ 7 / ° C. or less, and further preferably 200 ⁇ 10 ⁇ 7 / ° C. or less. This is to suppress the rise in the temperature inside the vehicle and the thermal expansion of the light guide plate by the light source in the backlight unit, and to achieve a thinner casing by narrowing the frame.
- the minimum value of the internal transmittance in the wavelength range of 400 to 700 nm is 80% or more under the condition of the optical path length of 50 mm, and the maximum value and the minimum value of the internal transmittance are The difference is preferably 15% or less.
- the minimum value of the internal transmittance is 85% or more, and the difference between the maximum value and the minimum value of the internal transmittance is more preferably 13% or less.
- the minimum value of the internal transmittance is 90% or more, More preferably, the difference between the maximum value and the minimum value of the internal transmittance is 8% or less.
- the material for forming the light guide plate is not particularly limited as long as it satisfies the above-described conditions and the completed in-vehicle display device 100 satisfies the formula (I) described later.
- the material for forming the light guide plate is specifically acrylic resin, polycarbonate, glass or the like, and glass is particularly preferable. This is because of excellent Young's modulus, high strength of the casing and backlight unit, low expansion due to heat and moisture, and excellent thickness reduction of the casing.
- the glass may be tempered, and the tempering method may be chemical or physical, but is preferably chemically tempered. Moreover, it is preferable that the end surface of glass is chamfered. It is further desirable to chemically strengthen after chamfering. This is to prevent cracking from the end surface portion of the light guide plate due to vibration of the vehicle display device.
- the configuration of the display panel 104 and the material of the housing 106 are not particularly limited as long as the in-vehicle display device 100 satisfies the formula (I) described later.
- the shape and size of the outer shape of the casing bottom member 107 are appropriately determined according to the outer shape of the in-vehicle display device 100.
- the in-vehicle display device 100 has recently been thinned in terms of design as well as the display panel module 100a. Therefore, since the outer shape of the display panel 104 is generally a rectangle such as a rectangle, in that case, the outer shape of the casing bottom member 107 is preferably a rectangle.
- the size of the casing bottom member 107 in a plan view is that when the boundary portion between the cover glass 12 and the display panel 104 is referred to as a CG back surface step portion 300, the CG back surface step portion 300 is viewed from the back surface. It is preferable to bond the bottom body member 107 to the lower part so as to cover all. This is to show excellent impact resistance in the head impact test described later.
- the size of the casing bottom member 107 is more preferably the same as or larger than that of the cover glass 12. When the non-display area from the display panel end to the cover glass end is wide, it is preferable to bond the casing bottom member 107 to the lower part so as to cover the CG back surface step portion 300.
- one or more other plate-like members may be bonded to the lower surface side of the housing bottom member 107, for example.
- the plate-like member is also preferably bonded to the lower part so as to cover all the CG back surface level difference portion 300 when viewed from the back surface in a vertical direction. This is also because it shows excellent impact resistance in the head impact test described later. More preferably, the size of the plate-like member is the same as or larger than that of the cover glass 12.
- the cover glass 10 with the adhesive layer bonds the adhesive layer 14 to the display surface 104 a of the display panel 104 so as to fill the opening 108 of the housing 106.
- the cover glass 12 covers the display surface 104 a of the in-vehicle display device 100 to the end surface 106 a of the housing 106.
- This cover glass 12 functions as a protective member for the display surface 104 a of the in-vehicle display device 100.
- the vehicle-mounted display device of the present invention has a configuration in which the cover glass is the first layer and the first layer to the n-th layer are laminated.
- the cover glass 12 first layer
- the display panel 104 second layer
- the backlight unit 102 third layer
- the housing fourth layer
- the body bottom member 107 has a configuration in which four layers are stacked in this order.
- the in-vehicle display device does not have a backlight unit, and at least three layers of a cover glass (first layer), a display panel (second layer), and a housing bottom member (third layer) are arranged in this order. It may have a laminated structure.
- the cover glass is used as a first layer member (that is, a first layer member on the surface on the display surface side), and one type or a plurality of types from the layer next to the first layer.
- the members are placed in order so as to be laminated, and have a laminated structure.
- the lamination is a form in which the constituent members are sequentially assembled in that order, or are sequentially assembled in that order.
- Each component does not need to be bonded and stacked, and may be partially or entirely stacked at intervals, and partially surrounded. Or the structure which overlaps may be sufficient and the form of the laminated structure of various variations is included.
- the cover glass is required to have excellent impact resistance that does not break even if the head of an occupant collides with the vehicle in the event of a vehicle collision.
- the present inventors have found that the impact resistance of the cover glass is excellent when the in-vehicle display device having the above configuration satisfies the following formula (I).
- the P is expressed as follows.
- E 1 Young's modulus of cover glass (unit: GPa) t 1 : thickness of cover glass (unit: mm)
- E 2 Young's modulus of display panel (unit: GPa) t 2 : thickness of display panel (unit: mm)
- E 3 Young's modulus of the backlight unit (unit: GPa) t 3 : thickness of the backlight unit (unit: mm)
- E 4 Young's modulus of casing bottom member (unit: GPa) t 4 : thickness of the casing bottom member (unit: mm) It is.
- the backlight unit has a structure in which a light guide plate made of a thick glass plate, a polycarbonate plate, an acrylic resin, etc., and several thin functional films such as a reflective polarizing film and a brightness enhancement film are laminated.
- the Young's modulus of the light guide plate is calculated as the Young's modulus of the backlight unit.
- the Young's modulus (E 1 ) of the cover glass is preferably 60 to 80 GPa, more preferably 70 to 80 GPa.
- the Young's modulus (E 2 ) of the display panel is preferably 60 to 80 GPa, more preferably 70 to 80 GPa.
- the Young's modulus (E 3 ) of the backlight unit is preferably 1 to 90 GPa, more preferably 2 to 90 GPa, and further preferably 60 to 90 GPa.
- the Young's modulus (E 4 ) of the casing bottom member is preferably 40 to 250 GPa, more preferably 150 to 250 GPa.
- the display panel, the backlight unit, and the housing may be a composite material formed by combining a plurality of materials. In that case, the Young's modulus of the entire composite material is preferably within the above numerical range.
- the Young's modulus of each member is measured by a tensile test (JIS K7161 and JIS K7113).
- the cover glass has a thickness (t 1 ) of 0.5 to 2.5 mm, preferably 0.7 to 2 mm, and more preferably 1.3 to 2 mm.
- the thickness (t 2 ) of the display panel is preferably 1 to 2 mm, more preferably 1.1 to 1.3 mm.
- the thickness (t 3 ) of the backlight unit is preferably 1 to 10 mm, more preferably 2 to 6 mm, and further preferably 3 to 5 mm.
- the thickness (t 4 ) of the housing bottom member is preferably 0.5 to 4 mm, and more preferably 1 to 4 mm.
- the thickness of each member is the length in the vertical direction in FIG.
- At least one of the members from the cover glass (first layer) to the nth layer is an adhesive layer.
- the adhesive layer 14 (referred to as the 1.5th layer) is disposed between the cover glass 12 (first layer) and the display panel 104 (second layer).
- E 1.5 Young's modulus
- t 1.5 thickness of the pressure-sensitive adhesive layer
- the Young's modulus (E 1.5 ) of the adhesive layer is sufficiently smaller than the Young's modulus of the other layers, and the thickness (t 1.5 ) is, for example, 5 to 400 ⁇ m.
- the value of “E 1.5 t 1.5 2 ” in P is negligibly small compared to the other values of “E 1 t 1 2 ” to “E 4 t 4 2 ”. Therefore, even when the adhesive layer is present in the laminated structure (the first layer to the nth layer), in the present embodiment, when considering the formula (I), it is considered that the adhesive layer is not present. Be good. In other words, the P value may be obtained assuming that the value of “E 1.5 t 1.5 2 ” is 0 (zero).
- the stress generated on the back surface of the cover glass as the first layer is:
- the lower one is preferable.
- sigma 1 of formula (4) is small, high Young's modulus of each member constituting the layer, also, as the thick layer, sigma 1 is can be seen that small. From the equation (6), it can be seen that the cross-sectional second moment has a correlation with the cube of the cover glass thickness, but from the equation (4), the back surface position (y) of the first layer, that is, the thickness is multiplied.
- P E 1 / (E 1 t 1 2 + E 2 t 2 2 + E 3 t 3 2 + E 4 t 4 2 )
- the display panel is a liquid crystal panel, an organic EL panel, a PDP, an electronic ink type panel, or the like, and may have a touch panel or the like.
- a display panel other than the liquid crystal panel for example, in the case of an organic EL panel or a PDP, the calculation is performed with the configuration excluding the backlight unit.
- Examples of such an in-vehicle display device include an on-dash type car navigation device standing on a dashboard, an in-dash type car navigation device embedded in a dashboard of a vehicle, and the like. Other devices (for example, an instrument panel) may be used.
- Tempered glass obtained by chemically strengthening aluminosilicate glass as cover glass (trade name “Dragon Trail” (registered trademark) manufactured by Asahi Glass Co., Ltd., compressive stress layer thickness: 38 ⁇ m, surface compressive stress in compressive stress layer: 774 MPa) Prepared.
- test body 200 was produced.
- the test body 200 will be described with reference to FIGS.
- FIG. 4 is a perspective view showing a test body.
- FIG. 5 is a cross-sectional view taken along line AA in FIG.
- FIG. 6 is a plan view showing the specimen.
- the test body 200 is assumed to be an on-dash type on-vehicle display device 100.
- the in-vehicle display device 100 includes a casing bottom member 107 that is a thin plate, and four casing frames 109 with ribs inside are arranged on the peripheral portion of the casing bottom member 107.
- the casing bottom member 107 and the four casing frames 109 form a casing 106 having a rectangular recess in the center region.
- the backlight unit 102 and the display panel 104 are the main constituent members in the recess.
- a display panel module 100a is arranged.
- An end portion on the upper surface side of the backlight unit 102 is bonded to an end portion on the lower surface side of the display panel 104 by a double-sided tape 207 or the like. Therefore, an air gap exists between the display panel 104 and the backlight unit 102 by the thickness of the double-sided tape 207 or the like.
- the distance due to the air gap is 0.5 to 1.5 mm from the backlight unit 102 to the display panel. In general, the air gap is set to 1.5 mm, but it is not necessary to be 1.5 mm depending on the situation, and there may be no air gap. This air gap is controlled by the thickness of an adhesive member such as the double-sided tape 207, and may not be used depending on the situation.
- the upper surface of the display panel 104 is lower than the upper surface of the housing frame 109 disposed around the display panel 104 and is a recess.
- the adhesive layer 14 of the cover glass 10 with the adhesive layer is bonded to the upper surface of the display panel 104 so as to fill the concave portion.
- a boundary portion between the cover glass 12 and the display panel 104 is a CG back surface step portion 300.
- a housing end frame 110 is disposed outside the side end surface of the cover glass 12 and on the top surface of the housing frame 109.
- Such an in-vehicle display device 100 is fixed to a solid fixing rib 213 integrated with a support plate 215 which is a flat plate by bolts 211 arranged in a gap in one housing frame 109.
- the housing bottom member 107 is bonded to the lower part so as to cover the entire CG back surface level difference portion 300 when viewed vertically from the back surface. Further, the distance from the CG back surface step portion 300 as shown in FIG. 5 to the outer periphery of the in-vehicle display device 100 and L 2, when the L 1 and L 2/2, housing bottom member 107 in FIGS. 5 (a) one end than the cross-sectional view dimensions of the display panel 104 as shown is used as the L 1 or larger size (one side ie housing bottom member 107, 2L 1 or greater than one side of the display panel 104), CG backside step It is preferable to cover all of the portion 300.
- one end than the cross-sectional view dimensions of the display panel 104 is used as a large size by L 1 or L 2 or less, it is more preferable to cover all CG backside stepped portion 300.
- the 5 end than the cross-sectional view dimensions of the display panel 104 as shown in (b) is (equal to the size of the That plan view when viewed vehicle display device 100 from the vertical), using those larger size by L 2, CG backside More preferably, the entire step portion 300 is covered. This is because the effect of reducing the tensile stress in the CG back surface level difference portion 300 can be most expected during the head impact test.
- the housing 106 may have a structure in which the housing frame 109, the housing bottom member 107, and the housing end frame 110 are separated from each other, may be an integrated molded product, or may have a partially integrated structure, There is no particular limitation.
- the cover glass 12, the display panel 104, the backlight unit 102, and the housing bottom member 107 are changed in each example, and the Young's modulus and thickness are shown in Table 1 and Table 2 below. It was changed as follows.
- soda lime glass was substituted for the display panel 104, and a polycarbonate plate was substituted for the backlight unit 102.
- a polycarbonate plate was substituted for the backlight unit 102.
- an aluminum plate Youngng's modulus: 68.6 GPa
- an iron plate Young's modulus: 206 GPa
- the structure is basically composed of a polarizing plate / glass substrate (for example, a plate thickness of 0.55 mm) / liquid crystal layer / glass substrate (for example, 0.55 mm). Plate thickness) / polarizing plate, but since the polarizing plate and the liquid crystal layer have low rigidity, the glass plate of the liquid crystal panel dominates the rigidity. Therefore, calculation was performed by substituting the Young's modulus of the glass substrate constituting the liquid crystal panel.
- H 1 to H 3 and W 1 to W 3 are H 1 : 120 mm, H 2 : 150 mm, H 3 : 250 mm, W 1 : 173 mm, W 2 : 250 mm, W 3 :
- the size of the casing bottom member 107 was set to 160 mm ⁇ 260 mm larger than the display panel 104.
- other parts were as follows.
- Adhesive layer 14 thickness: 175 ⁇ m, length: 120 mm, width: 173 mm, storage shear modulus: 8 kPa, -Double-sided tape 207 ...
- the collision position P (see FIG. 6) on the cover glass 12 that causes the rigid model to collide is a position that is closer to the side opposite to the fixed rib 213 side than the center of the display panel module 100a when the test body 200 is viewed from above. It was. More specifically, the collision position P is not on the housing frame 109 but on the display panel 104 and is a position 10 mm inside from the end of the display panel 104.
- the vehicle-mounted display apparatus excellent in the impact resistance of a cover glass can be obtained, and it is useful as a vehicle-mounted display apparatus mounted in vehicles, such as a motor vehicle. It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2014-169322 filed on August 22, 2014 are incorporated herein by reference. .
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Abstract
Description
このような車載表示装置においても、表示パネル保護の観点からフィルムやガラス等の透明な保護部材が使用されるが、近年では質感の観点から、フィルムではなくガラスの保護部材(カバーガラス)の使用が望まれている。さらに、ガラスのなかでも、合わせガラスは、厚くなりがちでデザイン上の問題が生じやすく、また、コストも高いことから、強化ガラスの使用が求められている。 A vehicle-mounted display device such as a car navigation device is mounted on a vehicle such as an automobile. Examples of the type of the in-vehicle display device include an on-dash type standing outside the dashboard, an in-dash type embedded in the dashboard, and the like.
In such an in-vehicle display device, a transparent protective member such as a film or glass is used from the viewpoint of protecting the display panel. However, in recent years, a protective member made of glass (cover glass) instead of a film is used from the viewpoint of texture. Is desired. Furthermore, among glass, laminated glass tends to be thick and easily causes design problems. Further, since the cost is high, use of tempered glass is required.
式(I)・・・P≦0.0302t1 2+0.0039t1+0.0478
(ただし、式(I)中、P=E1/(E1t1 2+…+Entn 2)、E1:カバーガラスのヤング率(単位:GPa)、t1:カバーガラスの厚さ(単位:mm)、En:第n層の部材のヤング率(単位:GPa)、tn:第n層の厚さ(単位:mm)、nは2以上の整数、である。) An in-vehicle display device according to an embodiment of the present invention is an in-vehicle display device configured by stacking members up to the n-th layer using a surface cover glass as a first layer, and the cover glass has a plate thickness. The tempered glass is 0.5 to 2.5 mm and the thickness of the surface compressive stress layer is 10 μm or more, and the in-vehicle display device is an in-vehicle display device that satisfies the following formula (I).
Formula (I) ... P ≦ 0.0302t 1 2 + 0.0039t 1 +0.0478
(In the formula (I), P = E 1 / (E 1 t 1 2 +... + E n t n 2 ), E 1 : Young's modulus of the cover glass (unit: GPa), t 1 : thickness of the cover glass (Unit: mm), E n : Young's modulus (unit: GPa) of the n-th layer member, t n : n-th layer thickness (unit: mm), and n is an integer of 2 or more.
図1は、粘着層付きカバーガラスを示す模式的断面図である。本実施形態では、車載表示装置を製造する方法として、粘着層付きカバーガラスを製造して、それを表示パネルに貼合する形態を一例として示すが、車載表示装置の製造方法は、それに限らない。例えば、OCA(Optically Clear Adhesive)フィルム等を介して、カバーガラスと表示パネルを貼合しても構わない。
図1に示す粘着層付きカバーガラス10は、透明なカバーガラス12と、粘着層14と、保護フィルム16と、遮光部20とを有する。
粘着層14は、カバーガラス12上に設けられる。カバーガラス12において粘着層14が設けられる領域のことを配置領域12aという。カバーガラス12には周縁部12bに遮光部20が形成されており、カバーガラス12の第1主面12cには粘着層14が形成されている。 [Cover glass with adhesive layer]
FIG. 1 is a schematic cross-sectional view showing a cover glass with an adhesive layer. In this embodiment, as an example of a method for manufacturing an in-vehicle display device, a cover glass with an adhesive layer is manufactured and bonded to a display panel. The method for manufacturing the in-vehicle display device is not limited thereto. . For example, the cover glass and the display panel may be bonded via an OCA (Optically Clear Adhesive) film or the like.
A
The
遮光部20は、後述する表示パネルの表示面(表示領域)以外の、表示パネルに接続されている配線部材等をカバーガラス12の第2主面12d側から視認できないように隠蔽するものである。もっとも、表示パネルの配線部材等が表示パネルを観察する側からは視認できない構造である場合等においては、遮光部20を必ずしも設ける必要はない。 The shape of the
The
カバーガラス12は、車載表示装置の表示面(表示領域)を保護するものであり、通常は、平面状、あるいは曲面を有する形状の板状体(ガラス板)である。
カバーガラス12の板厚は、0.5~2.5mmである。板厚が0.5mm未満であると、カバーガラス12自体の強度が不十分となり粘着層付きカバーガラス10の耐衝撃性が低下するおそれがある。また、板厚が2.5mm超であると、厚くなりすぎてしまい、設計上の観点から車載表示装置用途には不向きとなる。 〔cover glass〕
The
The
なお、カバーガラス12の大きさの一例としては、例えば、矩形の場合、長手方向:100~800mm、短手方向:40~300mmが挙げられる。 In general, the outer shape and size of the
As an example of the size of the
カバーガラス12には、例えば、アルミノシリケートガラスにイオン交換強化処理を施した化学強化ガラス(例えば、旭硝子社製「ドラゴントレイル(登録商標)」)が好適に用いられる。
なお、カバーガラス12を構成するガラス材料としては、例えば、モル%表示で、SiO2を50~80%、Al2O3を1~20%、Na2Oを6~20%、K2Oを0~11%、MgOを0~15%、CaOを0~6%およびZrO2を0~5%含有するガラス材料が挙げられる。
化学強化されたカバーガラス12の表面には、その両面に圧縮応力層が形成されており、その表面圧縮応力層の厚さは、10μm以上であり、好ましくは15μm以上、より好ましくは25μm以上、さらに好ましくは30μm以上である。また、表面圧縮応力層における表面圧縮応力は、650MPa以上であることが好ましく、750MPa以上であることがより好ましい。
カバーガラス12に化学強化処理を施す方法は、典型的には、カバーガラス12を、KNO3溶融塩に浸漬し、イオン交換処理した後、室温付近まで冷却する方法が挙げられる。KNO3溶融塩の温度や浸漬時間などの処理条件は、表面圧縮応力及び表面圧縮応力層の厚さが所望の値となるように設定すればよい。 In the present embodiment, as the
As the
The glass material constituting the
On the surface of the chemically strengthened
Typically, the method of subjecting the
粘着層14は、カバーガラス12を車載表示装置に貼合する際に、カバーガラス12を車載表示装置に接着するためのものである。粘着層14は、カバーガラス12と同じく透明であり、カバーガラス12と粘着層14との屈折率差は小さいことが好ましい。
粘着層14としては、例えば、液状の硬化性樹脂組成物を硬化してなる透明樹脂からなる層が挙げられる。硬化性樹脂組成物としては、例えば、光硬化性樹脂組成物、熱硬化性樹脂組成物などが挙げられ、なかでも、硬化性化合物および光重合開始剤を含む光硬化性樹脂組成物が好ましい。硬化性樹脂組成物としては、例えば、特許文献1に記載の層状部形成用光硬化性樹脂組成物が好適に挙げられる。
なお、粘着層14は、先述したようにカバーガラス12上に別途フィルム状に硬化されたOCA等を貼合しても構わない。 (Adhesive layer)
The
Examples of the
In addition, as described above, the
粘着層付きカバーガラス10の製造方法について説明する。以下では、液状の樹脂組成物をカバーガラス12上に塗布し、それを硬化する場合の形態について説明する。
まず、カバーガラス12の周縁部12bに、遮光部20を枠状に形成する。そして、カバーガラス12の第1主面12c全面に遮光部20を覆って、硬化性樹脂組成物を、例えば、ダイコータ、ロールコータ等の方法を用いて塗布し、硬化性樹脂組成物膜(図示せず)を形成する。硬化性樹脂組成物膜は、後述するように切断されて粘着層14になる。 [Method for producing cover glass with adhesive layer]
The manufacturing method of the
First, the
次に、得られた積層体において、粘着層14の側面14bとなる位置を切断線に設定し、レーザー光線を用いて、切断線で積層体を切断する。これにより、粘着層14の第1主面14aに保護フィルム16が設けられた粘着層付きカバーガラス10が得られる。
なお、予め硬化した粘着層フィルムを透明面材10上に貼合する場合や、樹脂組成物を精度良く塗布できる場合は、切断工程を省略しても構わない。 Next, a film material (not shown) is attached to the surface of the curable resin composition film. The film material is cut to become the
Next, in the obtained laminated body, the position which becomes the
In addition, a cutting process may be abbreviate | omitted when the adhesive layer film hardened | cured previously is bonded on the
次に、本実施形態の車載表示装置100を説明する。
図2は、車載表示装置100を示す模式的断面図である。
図2に示すように、車載表示装置100は、凹状の筐体106を有する。筐体106の底板である筐体底部材107上には、バックライトユニット102が載置され、バックライトユニット102上に、表示パネル104が載置されている。このようにして、バックライトユニット102と表示パネル104とが筐体106に収納されている。筐体106には開口部108が形成されており、開口部108側に表示パネル104が配置される。表示パネル104の開口部108に対応する領域を表示面104aとする。なお、バックライト102と表示パネル104とを主構成部材として表示パネルモジュール100aを構成する。 [In-vehicle display device]
Next, the in-
FIG. 2 is a schematic cross-sectional view showing the in-
As shown in FIG. 2, the in-
表示パネル端からカバーガラス端までの非表示エリアが広い場合には、このCG裏面段差部300を覆うように筺体底部材107を下部に貼合することが好ましい。
なお、筐体底部材107の例えば下面側には、さらに、別の板状部材が一枚以上貼合されていてもよい。前記板状部材に関しても、最背面から垂直に見て、このCG裏面段差部300を全て覆うように下部に貼合することが好ましい。これも、後述のヘッドインパクト試験において優れた耐衝撃性を示すためである。前記板状部材の大きさは、カバーガラス12と同じ、もしくはそれ以上の大きさであることがより好ましい。 Further, the configuration of the
When the non-display area from the display panel end to the cover glass end is wide, it is preferable to bond the
Note that one or more other plate-like members may be bonded to the lower surface side of the
粘着層付きカバーガラス10は、保護フィルム16を剥離した後、筐体106の開口部108を埋めるようにして、粘着層14を表示パネル104の表示面104aに貼合する。これにより、車載表示装置100の表示面104aから筐体106の端面106aに至るまでカバーガラス12で覆われる。このカバーガラス12が、車載表示装置100の表示面104aの保護部材として機能する。 As shown in FIG. 2, there is a step from the
After the
なお、実際には、カバーガラス(第1層)と表示パネル(第2層)との間に粘着層が存在する。粘着層の取り扱いについては、後述する。
上記した車載表示装置は、カバーガラスを第1層の部材とし(すなわち、表示面側の表層の第1層の部材とし)、当該第1層の次の層から1種類、あるいは複数の種類の部材が、積層状となるように順に載置され、積層された構成を有するが、ここにおいて積層とは、各構成部材が、順次、その順に集合された形態、または順次その順に組立てられた形態の構成を示すものであり、各構成部材が、接合されて積層されている必要はなく、また、一部または全体において間隔をおいて積層されていてもよく、また、一部において囲まれる、あるいは重なり合っている構造であってもよく、様々なバリエーションの積層構成の形態を含むものである。 Thus, the vehicle-mounted display device of the present invention has a configuration in which the cover glass is the first layer and the first layer to the n-th layer are laminated. Specifically, for example, in the above-described in-
Actually, an adhesive layer exists between the cover glass (first layer) and the display panel (second layer). The handling of the adhesive layer will be described later.
In the above-mentioned in-vehicle display device, the cover glass is used as a first layer member (that is, a first layer member on the surface on the display surface side), and one type or a plurality of types from the layer next to the first layer. The members are placed in order so as to be laminated, and have a laminated structure. Here, the lamination is a form in which the constituent members are sequentially assembled in that order, or are sequentially assembled in that order. Each component does not need to be bonded and stacked, and may be partially or entirely stacked at intervals, and partially surrounded. Or the structure which overlaps may be sufficient and the form of the laminated structure of various variations is included.
本発明者らは、上記構成を有する車載表示装置が下記式(I)を満たすときに、カバーガラスの耐衝撃性が優れることを見出した。
式(I) …… P≦0.0302t1 2+0.0039t1+0.0478 By the way, in an in-vehicle display device, the cover glass is required to have excellent impact resistance that does not break even if the head of an occupant collides with the vehicle in the event of a vehicle collision.
The present inventors have found that the impact resistance of the cover glass is excellent when the in-vehicle display device having the above configuration satisfies the following formula (I).
Formula (I): P ≦ 0.0302t 1 2 + 0.0039t 1 +0.0478
P=E1/(E1t1 2+…+Entn 2)
E1:カバーガラスのヤング率(単位:GPa)
t1:カバーガラスの厚さ(単位:mm)
En:第n層の部材のヤング率(単位:GPa)
tn:第n層の厚さ(単位:mm)
である。なお、上式において、nは2以上の整数である。 However, in formula (I),
P = E 1 / (E 1 t 1 2 +... + E n t n 2 )
E 1 : Young's modulus of cover glass (unit: GPa)
t 1 : thickness of cover glass (unit: mm)
E n : Young's modulus of the n-th layer member (unit: GPa)
t n : thickness of the n-th layer (unit: mm)
It is. In the above formula, n is an integer of 2 or more.
P=E1/(E1t1 2+E2t2 2+E3t3 2+E4t4 2)
E1:カバーガラスのヤング率(単位:GPa)
t1:カバーガラスの厚さ(単位:mm)
E2:表示パネルのヤング率(単位:GPa)
t2:表示パネルの厚さ(単位:mm)
E3:バックライトユニットのヤング率(単位:GPa)
t3:バックライトユニットの厚さ(単位:mm)
E4:筐体底部材のヤング率(単位:GPa)
t4:筐体底部材の厚さ(単位:mm)
である。
なお、バックライトユニットは、板厚の厚いガラス板、ポリカーボネート板やアクリル樹脂などからなる導光板と、反射型偏光フィルム、輝度向上フィルムなどの数種の薄い機能フィルムが積層された構成とされるが、上記導光板がバックライトユニットの剛性を支配するため、導光板のヤング率をバックライトユニットのヤング率として計算する。 For example, in the case of the above-described in-vehicle display device, it is called a cover glass (first layer), a display panel (second layer), a backlight unit (third layer), and a casing bottom member (fourth layer). Since it has a four-layer structure, the P is expressed as follows.
P = E 1 / (E 1 t 1 2 + E 2 t 2 2 + E 3 t 3 2 + E 4 t 4 2 )
E 1 : Young's modulus of cover glass (unit: GPa)
t 1 : thickness of cover glass (unit: mm)
E 2 : Young's modulus of display panel (unit: GPa)
t 2 : thickness of display panel (unit: mm)
E 3 : Young's modulus of the backlight unit (unit: GPa)
t 3 : thickness of the backlight unit (unit: mm)
E 4 : Young's modulus of casing bottom member (unit: GPa)
t 4 : thickness of the casing bottom member (unit: mm)
It is.
The backlight unit has a structure in which a light guide plate made of a thick glass plate, a polycarbonate plate, an acrylic resin, etc., and several thin functional films such as a reflective polarizing film and a brightness enhancement film are laminated. However, since the light guide plate controls the rigidity of the backlight unit, the Young's modulus of the light guide plate is calculated as the Young's modulus of the backlight unit.
表示パネルのヤング率(E2)は、60~80GPaが好ましく、70~80GPaがより好ましい。
バックライトユニットのヤング率(E3)は、1~90GPaが好ましく、2~90GPaがより好ましく、60~90GPaがさらに好ましい。
筐体底部材のヤング率(E4)は、40~250GPaが好ましく、150~250GPaがより好ましい。なお、表示パネル、バックライトユニットおよび筐体は、複数の材料が複合されて構成された複合材であっても構わない。その場合、複合材全体のヤング率が上記数値範囲に収まることが好ましい。
各部材のヤング率は、引張試験(JIS K7161・JIS K7113)により測定する。 The Young's modulus (E 1 ) of the cover glass is preferably 60 to 80 GPa, more preferably 70 to 80 GPa.
The Young's modulus (E 2 ) of the display panel is preferably 60 to 80 GPa, more preferably 70 to 80 GPa.
The Young's modulus (E 3 ) of the backlight unit is preferably 1 to 90 GPa, more preferably 2 to 90 GPa, and further preferably 60 to 90 GPa.
The Young's modulus (E 4 ) of the casing bottom member is preferably 40 to 250 GPa, more preferably 150 to 250 GPa. Note that the display panel, the backlight unit, and the housing may be a composite material formed by combining a plurality of materials. In that case, the Young's modulus of the entire composite material is preferably within the above numerical range.
The Young's modulus of each member is measured by a tensile test (JIS K7161 and JIS K7113).
表示パネルの厚さ(t2)は、1~2mmが好ましく、1.1~1.3mmがより好ましい。
バックライトユニットの厚さ(t3)は、1~10mmが好ましく、2~6mmがより好ましく、3~5mmがさらに好ましい。
筐体底部材の厚さ(t4)は、0.5~4mmが好ましく、1~4mmがより好ましい。
各部材の厚さは、図2中、上下方向の長さである。 The cover glass has a thickness (t 1 ) of 0.5 to 2.5 mm, preferably 0.7 to 2 mm, and more preferably 1.3 to 2 mm.
The thickness (t 2 ) of the display panel is preferably 1 to 2 mm, more preferably 1.1 to 1.3 mm.
The thickness (t 3 ) of the backlight unit is preferably 1 to 10 mm, more preferably 2 to 6 mm, and further preferably 3 to 5 mm.
The thickness (t 4 ) of the housing bottom member is preferably 0.5 to 4 mm, and more preferably 1 to 4 mm.
The thickness of each member is the length in the vertical direction in FIG.
ここで、粘着層のヤング率(E1.5)および厚さ(t1.5)を考慮した場合、上記Pは、以下のように表される。
P=E1/(E1t1 2+E1.5t1.5 2+E2t2 2+E3t3 2+E4t4 2)
しかしながら、粘着層のヤング率(E1.5)は、その他の層のヤング率と比較して十分に小さいうえに、その厚さ(t1.5)は、例えば5~400μmである。このため、上記P中の「E1.5t1.5 2」の値は、その他の「E1t1 2」~「E4t4 2」の値と比べて、無視できるほど小さい。
したがって、積層構造(第1層~第n層)中に粘着層が存在する場合であっても、本実施形態においては、式(I)を考える際に、粘着層は存在しないものとみなしてよいものとする。換言すれば、「E1.5t1.5 2」の値が0(ゼロ)であるとしてP値を求めてもよいものとする。 In the on-vehicle display device described above, actually, at least one of the members from the cover glass (first layer) to the nth layer is an adhesive layer. For example, in the four-layer structure described above, the adhesive layer 14 (referred to as the 1.5th layer) is disposed between the cover glass 12 (first layer) and the display panel 104 (second layer).
Here, when considering the Young's modulus (E 1.5 ) and thickness (t 1.5 ) of the pressure-sensitive adhesive layer, the above P is expressed as follows.
P = E 1 / (E 1 t 1 2 + E 1.5 t 1.5 2 + E 2 t 2 2 + E 3 t 3 2 + E 4 t 4 2 )
However, the Young's modulus (E 1.5 ) of the adhesive layer is sufficiently smaller than the Young's modulus of the other layers, and the thickness (t 1.5 ) is, for example, 5 to 400 μm. For this reason, the value of “E 1.5 t 1.5 2 ” in P is negligibly small compared to the other values of “E 1 t 1 2 ” to “E 4 t 4 2 ”.
Therefore, even when the adhesive layer is present in the laminated structure (the first layer to the nth layer), in the present embodiment, when considering the formula (I), it is considered that the adhesive layer is not present. Be good. In other words, the P value may be obtained assuming that the value of “E 1.5 t 1.5 2 ” is 0 (zero).
まず、異種材料が曲げの中立軸に平行な形で層状に配置されたはり(組み合わせばり)が曲げを受けた場合における曲率(各層すべて同じ)および各層に生じる応力について、理論計算式である式(1)~(3)を考える(Ai:i層の断面積、Ei:i層のヤング率、Ii:i層の断面2次モーメント、n:層数)。 Further, P in the formula (I) will be described.
First, an equation that is a theoretical calculation formula for the curvature (same for each layer) and the stress generated in each layer when a beam (combined beam) in which different materials are arranged in layers in parallel with the neutral axis of the bending is subjected to bending. Consider (1) to (3) (A i : cross-sectional area of i layer, E i : Young's modulus of i layer, I i : secondary moment of inertia of i layer, n: number of layers).
式(6)から、断面2次モーメントは、カバーガラス厚さの3乗に相関があることが分かるが、式(4)より、第1層の裏面位置(y)、つまり、厚さを掛けるので、カバーガラスが、割れる/割れないを判定するパラメータとして、式(4)および(6)から、下記式で表されるP値が導かれる。
P=E1/(E1t1 2+E2t2 2+E3t3 2+E4t4 2) Here, when considering the four-layer structure of cover glass / display panel / backlight unit / housing bottom member, in order for the cover glass not to break, the stress generated on the back surface of the cover glass as the first layer is: The lower one is preferable. In other words, preferably as sigma 1 of formula (4) is small, high Young's modulus of each member constituting the layer, also, as the thick layer, sigma 1 is can be seen that small.
From the equation (6), it can be seen that the cross-sectional second moment has a correlation with the cube of the cover glass thickness, but from the equation (4), the back surface position (y) of the first layer, that is, the thickness is multiplied. Therefore, the P value represented by the following formula is derived from the formulas (4) and (6) as parameters for determining whether the cover glass breaks / breaks.
P = E 1 / (E 1 t 1 2 + E 2 t 2 2 + E 3 t 3 2 + E 4 t 4 2 )
なお、液晶パネル以外の表示パネルの場合、たとえば、有機ELパネル、PDPの場合には、バックライトユニットを除いた構成で計算される。
このような車載表示装置としては、例えば、ダッシュボード上に立設されたオンダッシュタイプのカーナビゲーション装置、車両のダッシュボードに埋め込まれたインダッシュタイプのカーナビゲーション装置などが挙げられ、さらに、カーナビゲーション装置以外の装置(例えば、インストルメントパネル)であってもよい。 The display panel is a liquid crystal panel, an organic EL panel, a PDP, an electronic ink type panel, or the like, and may have a touch panel or the like.
In the case of a display panel other than the liquid crystal panel, for example, in the case of an organic EL panel or a PDP, the calculation is performed with the configuration excluding the backlight unit.
Examples of such an in-vehicle display device include an on-dash type car navigation device standing on a dashboard, an in-dash type car navigation device embedded in a dashboard of a vehicle, and the like. Other devices (for example, an instrument panel) may be used.
カバーガラスとして、アルミノシリケートガラスに化学強化処理を施した強化ガラス(旭硝子社製商品名「ドラゴントレイル」(登録商標)、圧縮応力層の厚さ:38μm、圧縮応力層における表面圧縮応力:774MPa)を準備した。 <Preparation of cover glass>
Tempered glass obtained by chemically strengthening aluminosilicate glass as cover glass (trade name “Dragon Trail” (registered trademark) manufactured by Asahi Glass Co., Ltd., compressive stress layer thickness: 38 μm, surface compressive stress in compressive stress layer: 774 MPa) Prepared.
カバーガラスの第1主面に、OCAフィルム(日栄化工社製「MHM-FWD」)を積層し粘着層付きカバーガラスを作製した。 <Preparation of cover glass with adhesive layer>
On the first main surface of the cover glass, an OCA film (“MHM-FWD” manufactured by Nichiei Kako Co., Ltd.) was laminated to produce a cover glass with an adhesive layer.
まず、剛体模型を衝突させる試験(「ヘッドインパクト試験」ともいう)を行なうため、試験体200を作製した。図4~図6に基づいて試験体200を説明する。 <Preparation of specimen>
First, in order to perform a test (also referred to as a “head impact test”) for causing a rigid model to collide, a
試験体200は、オンダッシュタイプの車載表示装置100を想定している。
車載表示装置100は、薄板である筐体底部材107を有し、筐体底部材107の周縁部上には、内部にリブが付いた筐体枠109が4つ配置されている。筐体底部材107と4つの筐体枠109とによって、中央領域に矩形の凹部を有する筐体106が形成され、この凹部には、バックライトユニット102と表示パネル104とを主構成部材とした表示パネルモジュール100aが配置されている。
バックライトユニット102の上面側の端部は、表示パネル104の下面側の端部と両面テープ207などによって接着されている。このため、表示パネル104とバックライトユニット102との間には、両面テープ207などの厚さ分だけ、エアギャップが存在している。このエアギャップによる間隔は、バックライトユニット102から表示パネルまで0.5~1.5mmとしている。なお、一般的にはエアギャップを1.5mmとしているが、状況によって1.5mmである必要は無く、エアギャップが無くても良い。このエアギャップは、両面テープ207などの接着部材の厚さで制御し、状況に応じて使用しないこともある。表示パネル104の上面は、周囲に配置された筐体枠109の上面よりも低位置であり、凹部となっている。この凹部を埋めるようにして、粘着層付きカバーガラス10の粘着層14が、表示パネル104の上面に貼合されている。カバーガラス12と表示パネル104の境界部がCG裏面段差部300となる。カバーガラス12の側端面の外側であって、かつ筐体枠109の上面には、筐体端枠110が配置されている。
このような車載表示装置100は、1つの筐体枠109内の空隙に配置されたボルト211によって、平板である支持板215と一体化した中実の固定リブ213に固定されている。
なお、実際の車載表示装置において、最背面から垂直に見てCG裏面段差部300をすべて覆うように筺体底部材107を下部に貼合することが好ましい。また、図5に示すようにCG裏面段差部300から車載表示装置100の外周までの距離をL2とし、L1をL2/2とすると、筺体底部材107は、図5(a)に示すように表示パネル104の断面視寸法より一端がL1以上大きい寸法のものを用いて(すなわち筺体底部材107の1辺は、表示パネル104の1辺より2L1以上大きい)、CG裏面段差部300すべてを覆うことが好ましい。これは、ヘッドインパクト試験の際にCG裏面段差部300における引張応力を低減する効果が期待できるためである。さらに表示パネル104の断面視寸法より一端がL1以上L2以下だけ大きい寸法のものを用いて、CG裏面段差部300すべてを覆うことがさらに好ましい。また図5(b)に示すように表示パネル104の断面視寸法より一端がL2だけ大きい寸法のものを用いて(すなわち車載表示装置100を垂直からみた平面視の大きさと等しい)、CG裏面段差部300すべてを覆うことがさらに好ましい。これは、ヘッドインパクト試験の際にCG裏面段差部300における引張応力を低減する効果が最も期待できるためである。
また、実際の車載表示装置においても、CG裏面段差部300において、筺体底部材107を下部に貼合するとともに、筺体枠109に対して数か所においてリブを設けたリブ構造を採用することにより、剛性を向上しておくことが好ましい。これは、筺体枠109において、表示パネルデザイン上、樹脂材を用いることが多く、樹脂ゆえに剛性が劣る場合があるが、上記リブ構造を採用することにより、ヘッドインパクト試験において優れた耐衝撃性を得ることができるためである。なお、筺体106は、筺体枠109と筺体底部材107、筺体端枠110とがそれぞれ分離した構造でもよく、全て一体化した成形品であってもよく、一部が一体化した構造でも良く、特に限定されない。 FIG. 4 is a perspective view showing a test body. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a plan view showing the specimen.
The
The in-
An end portion on the upper surface side of the
Such an in-
In an actual in-vehicle display device, it is preferable that the
Also, in the actual in-vehicle display device, by adopting a rib structure in which the
なお、試験体200においては、表示パネル104としてソーダライムガラスを代用し、バックライトユニット102としてポリカーボネート板を代用した。
また、筐体底部材107としては、アルミ板(ヤング率:68.6GPa)または鉄板(ヤング率:206GPa)を使用した。
なお、上記した通常のTFT液晶パネルからなる表示パネルの場合、その構成は、基本的に、偏光板/ガラス基板(たとえば0.55mmの板厚)/液晶層/ガラス基板(たとえば0.55mmの板厚)/偏光板の積層構成となっているが、偏光板及び液晶層は剛性が低いため、上記液晶パネルのガラス板が剛性を支配する。従って、液晶パネルを構成するガラス基板のヤング率を代用して計算した。 In the
In the
As the
In the case of a display panel composed of the above-described normal TFT liquid crystal panel, the structure is basically composed of a polarizing plate / glass substrate (for example, a plate thickness of 0.55 mm) / liquid crystal layer / glass substrate (for example, 0.55 mm). Plate thickness) / polarizing plate, but since the polarizing plate and the liquid crystal layer have low rigidity, the glass plate of the liquid crystal panel dominates the rigidity. Therefore, calculation was performed by substituting the Young's modulus of the glass substrate constituting the liquid crystal panel.
また、試験体200において、その他の各部は、以下のようにした。
・粘着層14…厚さ:175μm、縦:120mm、横:173mm、貯蔵せん断弾性率:8kPa、
・両面テープ207…住友スリーエム社製「スコッチPBT-10」、テープ幅:5mm、テープ厚:0.5mm、
・筐体枠109…材質:ABS、板厚:1mm、
・筐体端枠110…材質:ABS、板厚:2mm、幅:5mm、
・ボルト211…材質:鉄、
・固定リブ213…材質:鉄、サイズ:19mm×100mm×50mm、
・支持板215…材質:鉄、板厚:9mm、縦:250mm、横:350mm。 In FIG. 6, the sizes indicated by H 1 to H 3 and W 1 to W 3 are H 1 : 120 mm, H 2 : 150 mm, H 3 : 250 mm, W 1 : 173 mm, W 2 : 250 mm, W 3 : The size of the
Moreover, in the
Adhesive layer 14: thickness: 175 μm, length: 120 mm, width: 173 mm, storage shear modulus: 8 kPa,
-Double-
-
Case end frame 110: Material: ABS, plate thickness: 2 mm, width: 5 mm,
・
・ Fixing
Support plate 215: material: iron, plate thickness: 9 mm, length: 250 mm, width: 350 mm.
次に、試験体200の支持板215を水平面に設置し、車載表示装置100と支持板215との間に衝撃吸収クッション(ケー・シー・シー商会社製「CF45」、厚さ:25.4mm)を2段挟み込んだ後、カバーガラス12の第2主面12dの衝突位置P(図6参照)に、図示しない球状の剛体模型(材質:鉄、直径:165mm、質量:19.6kg)を、衝突時のエネルギーが152.5Jになるように、衝突速度3.9m/sで794mmの高さから落下させて衝突させた。 <Evaluation of impact resistance (head impact test)>
Next, the
すなわち、試験体200を用いたヘッドインパクト試験では、衝突時のエネルギーが「基準」と同等になるようにした。 For the test method, refer to “Attachment 28: Technical standards for shock absorption of instrument panels” (hereinafter simply referred to as “standards”) in “
That is, in the head impact test using the
なお、2014年8月22日に出願された日本特許出願2014-169322号の明細書、特許請求の範囲、図面および要約書の全内容をここに引用し、本発明の開示として取り入れるものである。 ADVANTAGE OF THE INVENTION According to this invention, the vehicle-mounted display apparatus excellent in the impact resistance of a cover glass can be obtained, and it is useful as a vehicle-mounted display apparatus mounted in vehicles, such as a motor vehicle.
It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2014-169322 filed on August 22, 2014 are incorporated herein by reference. .
Claims (7)
- 表層のカバーガラスを第1層として、第n層までの部材が積層されて構成された車載表示装置であって、
前記カバーガラスは、板厚が0.5~2.5mmであり、かつ、表面圧縮応力層の厚さが10μm以上である強化ガラスであり、
前記車載表示装置は、下記式(I)を満たす、車載表示装置。
式(I) …… P≦0.0302t1 2+0.0039t1+0.0478
(ただし、式(I)中、
P=E1/(E1t1 2+…+Entn 2)
E1:カバーガラスのヤング率(単位:GPa)
t1:カバーガラスの厚さ(単位:mm)
En:第n層の部材のヤング率(単位:GPa)
tn:第n層の厚さ(単位:mm)
である。ここにおいて、nは2以上の整数である。) It is an in-vehicle display device configured by laminating members up to the nth layer with the surface cover glass as the first layer,
The cover glass is a tempered glass having a plate thickness of 0.5 to 2.5 mm and a thickness of the surface compressive stress layer of 10 μm or more,
The in-vehicle display device satisfies the following formula (I).
Formula (I): P ≦ 0.0302t 1 2 + 0.0039t 1 +0.0478
(However, in formula (I),
P = E 1 / (E 1 t 1 2 +... + E n t n 2 )
E 1 : Young's modulus of cover glass (unit: GPa)
t 1 : thickness of cover glass (unit: mm)
E n : Young's modulus of the n-th layer member (unit: GPa)
t n : thickness of the n-th layer (unit: mm)
It is. Here, n is an integer of 2 or more. ) - 前記カバーガラスから前記第n層までの部材に表示パネルと筺体底部材を含み、前記筺体底部材の大きさは、前記表示パネルの表示部より大きい、請求項1に記載の車載表示装置。 The vehicle-mounted display device according to claim 1, wherein a member from the cover glass to the nth layer includes a display panel and a housing bottom member, and the size of the housing bottom member is larger than a display portion of the display panel.
- 前記カバーガラスから前記第n層までの部材にバックライトユニットを含み、前記バックライトユニットは、導光板を有し、前記導光板は、ガラスからできている、請求項1または2に記載の車載表示装置。 The vehicle-mounted vehicle according to claim 1 or 2, wherein a member from the cover glass to the n-th layer includes a backlight unit, the backlight unit includes a light guide plate, and the light guide plate is made of glass. Display device.
- 前記カバーガラスから前記第n層までの部材に、表示パネル、バックライトユニット、筺体底部材を含み、前記筺体底部材上に前記バックライトユニットが載置され、前記バックライトユニット上に前記表示パネルが載置されている、請求項1~3のいずれか1項に記載の車載表示装置。 The members from the cover glass to the n-th layer include a display panel, a backlight unit, and a housing bottom member. The backlight unit is placed on the housing bottom member, and the display panel is placed on the backlight unit. The in-vehicle display device according to any one of claims 1 to 3, wherein is mounted.
- 前記カバーガラスから前記第n層までの部材の少なくとも一層に粘着層を含み、当該粘着層の厚さが5~400μmである、請求項1~4のいずれか1項に記載の車載表示装置。 The in-vehicle display device according to any one of claims 1 to 4, wherein an adhesive layer is included in at least one of the members from the cover glass to the nth layer, and the thickness of the adhesive layer is 5 to 400 μm.
- 前記カバーガラスの表面圧縮応力が650MPa以上である、請求項1~5のいずれか1項に記載の車載表示装置。 The in-vehicle display device according to any one of claims 1 to 5, wherein a surface compressive stress of the cover glass is 650 MPa or more.
- 前記カバーガラスは、板厚が0.5~2.5mmであり、表面圧縮応力層の厚さが10μm以上であり、650MPa以上の表面圧縮応力を有する化学強化ガラスである、請求項1~6のいずれか1項に記載の車載表示装置。 The cover glass is a chemically strengthened glass having a plate thickness of 0.5 to 2.5 mm, a surface compressive stress layer thickness of 10 μm or more, and a surface compressive stress of 650 MPa or more. The in-vehicle display device according to any one of the above.
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KR1020167033081A KR20170048249A (en) | 2014-08-22 | 2015-08-18 | On-board display apparatus |
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CN110264874A (en) | 2019-09-20 |
TW201613831A (en) | 2016-04-16 |
DE112015003842T5 (en) | 2017-05-18 |
TWI722605B (en) | 2021-03-21 |
CN106604902B (en) | 2019-08-06 |
TWI678341B (en) | 2019-12-01 |
CN110264874B (en) | 2021-02-09 |
JP6631673B2 (en) | 2020-01-15 |
KR20170048249A (en) | 2017-05-08 |
JP6418241B2 (en) | 2018-11-07 |
JP2019019054A (en) | 2019-02-07 |
CN106604902A (en) | 2017-04-26 |
JPWO2016027812A1 (en) | 2017-06-08 |
TW202003399A (en) | 2020-01-16 |
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