Display device

Abstract

The present invention suppresses cracking of a cover plate member. A display device (1) is provided with: a bottom member (5); a display panel (3) provided on the bottom member (5); side wall members (8b, 8c) provided around the display panel (3); and a glass cover plate member (2) which is provided on the display panel (3) and the side wall members (8b, 8c), and which has a thickness tcg of 0.3-0.7 mm (inclusive). When the direction from the bottom member (5) toward the cover plate member (2) in the thickness direction of the cover plate member (2) is defined as a first direction, the cover plate member (2) has a first main surface (2A) on the first direction side, a second main surface (2B) on the opposite side to the first main surface (2A), and an end surface (2C) connecting the first main surface (2A) and the second main surface (2B), and when the parameter A is a value represented by formula (1) and the parameter B is a value represented by formula (2), the parameter A is a value represented by formula (1), and the parameter B is a value represented by formula (2). When the parameter C is a value represented by formula (3), the parameter D is a value represented by formula (4), and the parameter T is a value represented by formula (5), the parameter T is less than 0.

Description

Technical Field

[0001] This invention relates to display devices. Background Technology

[0002] In vehicle-mounted display devices that display information required for operation, liquid crystal displays (LCDs) and organic EL displays are sometimes used. These display devices sometimes include a glass cover plate to protect the front surface. For example, Patent Document 1 describes a vehicle-mounted display device that improves the impact resistance of the cover plate.

[0003] Patent Document 1: International Publication No. 2016 / 027812

[0004] For example, in vehicle-mounted display devices, excellent impact resistance is required so that the cover components do not break even if the occupant's head is hit in a vehicle collision. Summary of the Invention

[0005] The purpose of this invention is to provide a display device capable of suppressing the breakage of the cover plate component.

[0006] The display device disclosed herein includes: a bottom component; a display layer disposed on the bottom component; a sidewall component disposed around the display layer; and a glass cover component disposed on the display layer and the sidewall component, having a thickness of 0.3 mm or more and 0.7 mm or less. When the direction of the thickness direction of the cover component from the bottom component toward the cover component is set as a first direction, the cover component has a first main surface on the side of the first direction, a second main surface on the side opposite to the first main surface, and an end surface connecting the first main surface and the second main surface. When parameter A is set to the value shown in formula (1), parameter B is set to the value shown in formula (2), parameter C is set to the value shown in formula (3), parameter D is set to the value shown in formula (4), and parameter T is set to the value shown in formula (5), the parameter T is less than 0.

[0007] A = Ecg × tcg 2 ・・・(1)

[0008] B = Σ(Eb × tb) 2 )・・・(2)

[0009] C=Σ(Eb×tc)・・・(3)

[0010] D = Ed × td 2 ・・・(4)

[0011] T=0.212245+A(-0.00997+0.000124×B+0.0000362×C-0.000022×D-0.00809×G)-0.00817×B-0.00183×C+0.001722×D+0.957752×G・・・(5)

[0012] here,

[0013] Ecg is the Young's modulus of the aforementioned cover plate component, expressed in GPa.

[0014] tcg represents the thickness of the aforementioned cover plate component, in mm.

[0015] Eb is the Young's modulus of the aforementioned sidewall component, expressed in GPa.

[0016] tb is the thickness of the portion of the sidewall component that protrudes outward from the end face of the cover plate component, in mm.

[0017] tc is the protrusion length of the portion of the sidewall component that protrudes outward from the end face of the cover plate component, expressed in mm.

[0018] Ed is the Young's modulus of the aforementioned base component, expressed in gigabytes of pressure (GPa).

[0019] td represents the thickness of the aforementioned bottom component, in mm.

[0020] G is the protrusion length of the first main surface of the cover plate component, extending in the first direction from the surface of the frame component adjacent to the end face of the cover plate component on the outer side, and protruding in the first direction, in mm.

[0021] According to the present invention, it is possible to suppress the cracking of the cover plate component. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the display device involved in this embodiment.

[0023] Figure 2 yes Figure 1 A-A sectional view.

[0024] Figure 3 yes Figure 1 B-B sectional view.

[0025] Figure 4 This is a bottom view of the bottom component.

[0026] Figure 5 This is a partially enlarged view of the cross-section of the display device according to this embodiment.

[0027] Figure 6 This is a schematic enlarged view of a bottom component with ribs. Detailed Implementation

[0028] The display device disclosed herein includes: a bottom component; a display layer disposed on the bottom component; a sidewall component disposed around the display layer; and a glass cover component disposed on the display layer and the sidewall component, having a thickness of 0.3 mm or more and 0.7 mm or less. When the direction of the thickness direction of the cover component from the bottom component toward the cover component is set as a first direction, the cover component has a first main surface on the side of the first direction, a second main surface on the side opposite to the first main surface, and an end surface connecting the first main surface and the second main surface. When parameter A is set to the value shown in equation (1), parameter B is set to the value shown in equation (2), parameter C is set to the value shown in equation (3), parameter D is set to the value shown in equation (4), and parameter T is set to the value shown in equation (5), the parameter T is less than 0.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments; in cases where multiple embodiments exist, embodiments combining these embodiments are also included. Furthermore, numerical values ​​include rounding ranges.

[0030] (1. Structure of the display device)

[0031] Figure 1 This is a schematic diagram illustrating the display device according to this embodiment. Figure 2 yes Figure 1 A-A sectional view, Figure 3 yes Figure 1 The B-B sectional view. For example... Figure 1 As shown, the display device 1 according to this embodiment is an in-vehicle display device installed in a vehicle. The display device 1 can be, for example, a vehicle navigation device, but its application is arbitrary; it can also be other display devices mounted in a vehicle, such as a display or audio device. Although described in detail below, the display device 1 is fixed to the interior part 10 of the vehicle via a fixing point P formed on its back side opposite to the display surface. The interior part 10 is a component installed inside the vehicle, such as part of the vehicle's instrument panel. The display device 1 of this embodiment is particularly suitable for use as a display device for the instrument panel in front of the driver's seat or passenger seat in the case of a sedan. However, the application of the display device 1 is arbitrary, and it can also be installed in a vehicle.

[0032] Hereinafter, the thickness direction of display device 1 will be defined as the Z direction, and the direction orthogonal to the Z direction and along the horizontal plane will be defined when display device 1 is installed in a vehicle. Figure 1 In the example, the left and right directions are set as the X direction, and the directions orthogonal to both the Z and X directions (in...) are set as... Figure 1 In the example, the up-down direction is set as the Y direction. Additionally, a direction along the X direction (in...) is... Figure 1 In the example, the right direction) is set as direction X1, and the other direction along the X direction (in Figure 1 In this example, the left direction is designated as direction X2, one direction along the Y direction (direction towards the vertical direction upward) is designated as direction Y1, another direction along the Y direction (direction towards the vertical direction downward) is designated as direction Y2, one direction along the Z direction (direction from the back of the display device 1 towards the display surface) is designated as direction Z1 (first direction), and another direction along the Z direction (direction from the display surface of the display device 1 towards the back) is designated as direction Z2. In this embodiment, the end of the display device 1 on the direction Y1 side becomes the upper end (upper end) in the vertical direction.

[0033] like Figure 2 As shown, the display device 1 includes a cover plate component 2, a display panel 3 serving as a display layer, a backlight unit 4, a bottom component 5, and a surrounding component 8. The display device 1 is arranged in the following order (overlapping): bottom component 5, backlight unit 4, display panel 3, and cover plate component 2, oriented in the Z1 direction. A frame-shaped surrounding component 8 is arranged around the cover plate component 2, display panel 3, and backlight unit 4. That is, the cover plate component 2, bottom component 5, and surrounding component 8 constitute a housing 1A that houses the display panel 3. The bottom component 5 covers the back side (the side opposite to the display side) of the cover plate component 2 and display panel 3, and the surrounding component 8 covers the sides of the cover plate component 2 and display panel 3.

[0034] (Cover plate component)

[0035] The cover plate component 2 is a transparent plate-shaped component that transmits visible light. The cover plate component 2 is disposed on the display panel 3 and the side wall component (described later) in the Z1 direction of the display panel 3 and the side wall component. The cover plate component 2 has a first main surface 2A as the main surface in the Z1 direction (display surface side), a second main surface 2B as the main surface in the Z2 direction (back side), and an end surface 2C connecting the first main surface 2A and the second main surface 2B. The end surface 2C is also referred to as the side surface of the cover plate component 2. Preferably, the second main surface 2B is the surface on the display panel 3 side, and the first main surface 2A is the surface exposed to the outside on the opposite side of the display panel 3. The cover plate component 2 may also have a printed layer disposed on the second main surface 2B side (above the second main surface 2B). The printed layer is a light-shielding layer for the cover plate component 2 and has a lower transmittance of visible light than the cover plate component 2. Examples of printed layers include a black layer with low transmittance of visible light and a layer with a wood grain pattern. The printed layer is preferably configured to surround the area of ​​the second main surface 2B that overlaps with the display panel 3 when viewed from the Z direction. Furthermore, the cover plate component 2 may also have a functional layer comprising at least one of an anti-glare layer, an anti-reflective layer, and an anti-fouling layer on the side of the first main surface 2A.

[0036] The thickness tcg of the cover plate component 2 is 0.3 mm or more and 0.7 mm or less, preferably 0.4 mm or more and 0.7 mm or less, more preferably 0.4 mm or more and 0.55 mm or less, and more preferably 0.4 mm or more and less than 0.5 mm. Furthermore, the thickness tcg is the length in the Z direction from the first main surface 2A to the second main surface 2B.

[0037] In this embodiment, the cover plate component 2 is a rectangular flat plate when viewed from the Z direction. Regarding the dimensions of the cover plate component 2, for example, when the cover plate component 2 is rectangular, the length of the long side (X direction in this embodiment) is 50 mm or more and 1500 mm or less, preferably 100 mm or more and 1200 mm or less, and the length of the short side (Y direction in this embodiment) is 40 mm or more and 500 mm or less, preferably 100 mm or more and 300 mm or less. However, the cover plate component 2 is not limited to being a rectangular flat plate when viewed from the Z direction, but can be of any shape, such as an ellipse when viewed from the Z direction, or even a curved shape. Furthermore, the dimensions of the cover plate component 2 can also be arbitrary. Additionally, when the cover plate component 2 is curved, the thickness direction of the cover plate component 2 at the center of its main surface can be set to the Z direction.

[0038] The Young's modulus Ecg of the cover plate component 2 is preferably 60 GPa or higher and 90 GPa or lower, more preferably 70 GPa or higher and 80 GPa or lower, and even more preferably 70 GPa or higher and 75 GPa or lower. The Young's modulus of each component including the cover plate component 2 can be determined by tensile testing (JIS K7161-1, 2: 2014, JIS K7113: 1995).

[0039] In this embodiment, the cover plate component 2 is made of glass. The cover plate component 2 is preferably tempered glass, and chemically tempered glass is more preferably used as the tempered glass.

[0040] When the cover plate component 2 is chemically strengthened glass, the thickness (DOL) of the compressive stress layer of the cover plate component 2 is preferably 10 μm or more, more preferably 10 μm or more and 180 μm or less, even more preferably 15 μm or more and 50 μm or less, even more preferably 25 μm or more and 50 μm or less, and even more preferably 30 μm or more and 50 μm or less.

[0041] The surface compressive stress (CS) of the compressive stress layer is preferably 500 MPa or more, more preferably 650 MPa or more, and even more preferably 750 MPa or more. There is no particular upper limit; for example, CS is preferably 1200 MPa or less.

[0042] A typical method for obtaining chemically strengthened glass by applying a chemical strengthening treatment to glass is to immerse the glass in molten KNO3 salt, perform ion exchange treatment, and then cool it to around room temperature. The treatment conditions, such as the temperature of the molten KNO3 salt and the immersion time, can be set to the desired values ​​for the surface compressive stress and the thickness of the compressive stress layer.

[0043] Examples of glass types include sodium calcium carbonate glass and aluminosilicate glass (SiO2-Al2O3-Na2O series glass). Among these, aluminosilicate glass is preferred from the viewpoint of strength.

[0044] As a glass material, examples include glass materials containing, in molar percentage based on oxides, 50% or more and 80% or less SiO2, 1% or more and 20% or less Al2O3, 6% or more and 20% or less Na2O, 0% or more and 11% or less K2O, 0% or more and 15% or less MgO, 0% or more and 6% or less CaO, and 0% or more and 5% or less ZrO2.

[0045] It is also suitable to use chemically strengthened glass based on aluminosilicate glass (e.g., "Dragontrail" manufactured by AGC (registered trademark)).

[0046] More specifically, a more preferred composition for the glass used as cover plate component 2 can be listed below. For example, "containing 0 to 25% MgO" means that MgO is not necessary and can be contained up to 25%. The glass described in (i) below contains calcium sodium silicate glass, the glass described in (ii) and (iii) below below contains aluminosilicate glass, and the glass described in (iv) to (vi) below below contains lithium aluminosilicate glass.

[0047] (i) A glass comprising, in mole percent based on oxides, 63% to 73% SiO2, 0.1% to 5.2% Al2O3, 10% to 16% Na2O, 0% to 1.5% K2O, 0% to 5.0% Li2O, 5% to 18% MgO and 1% to 10% CaO.

[0048] (ii) A glass comprising, in mole percent based on oxides, 50% to 74% SiO2, 5% to 15% Al2O3, 10% to 20% Na2O, 0% to 8% K2O, 0% to 5.0% Li2O, 2% to 15% MgO, 0% to 6% CaO, and 0% to 5% ZrO2, wherein the total content of SiO2 and Al2O3 is 65% to 85%, the total content of Na2O and K2O is 12% to 25%, and the total content of MgO and CaO is 1% to 15%.

[0049] (iii) A glass containing 68% to 80% SiO2, 4% to 10% Al2O3, 5% to 15% Na2O, 0% to 1% K2O, 0% to 5.0% Li2O, 4% to 15% MgO and 0% to 1% ZrO2, according to a composition expressed in mole percent based on oxides.

[0050] (iv) Glass containing, in mole percent based on oxides, 67% to 75% SiO2, 0% to 4% Al2O3, 7% to 15% Na2O, 1% to 9% K2O, 0% to 5.0% Li2O, 6% to 14% MgO and 0% to 1.5% ZrO2, wherein the total content of SiO2 and Al2O3 is 71% to 75%, the total content of Na2O and K2O is 12% to 20%, and the content of CaO is less than 1% in the case of CaO.

[0051] (v) A glass containing, in mole percent based on oxides, 50%–73% SiO2, 5%–20% Al2O3, 0%–6% B2O3, 0%–10% P2O5, 4%–12% Li2O, 3%–20% Na2O, 0%–5% K2O, 0%–8% MgO, 0%–2% CaO, 0%–5% SrO, 0%–5% BaO, 0%–5% ZnO, 0%–2% TiO2 and 0%–4% ZrO2.

[0052] (vi) A glass containing, in mole percent based on oxides, 58%–80% SiO2, 13%–18% Al2O3, 0%–5% B2O3, 0.5%–4% P2O5, 3%–10% Li2O, 5%–20% Na2O, 0%–2% K2O, 0%–11% MgO, 0%–20% CaO, 0%–20% SrO, 0%–15% BaO, 0%–10% ZnO, 0%–1% TiO2, and 0%–2% ZrO2.

[0053] (Display panel)

[0054] Display panel 3 is a panel for displaying images and is disposed on top of bottom member 5 (on the Z1 side of bottom member). Furthermore, display panel 3 is configured to overlap cover member 2 on the Z2 side. The Z1 side surface of display panel 3, i.e., the display surface, is bonded to the second main surface 2B of cover member 2 by an adhesive layer (not shown). The adhesive layer is, for example, an OCA (Optical Clear Adhesive) film or OCA tape, and its thickness (length in the Z direction) is, for example, 5 μm or more and 400 μm or less, preferably 50 μm or more and 200 μm or less.

[0055] Display panel 3 can be a liquid crystal panel, an organic EL panel, a flexible organic EL panel, a plasma display panel (PDP), an electronic ink panel, etc., and may also include a touch panel. When display panel 3 has a glass substrate, the thickest part is the glass substrate, which determines the overall rigidity of the display panel. Therefore, the Young's modulus of the glass substrate can also be considered as the Young's modulus of display panel 3.

[0056] The Young's modulus of the display panel 3 is preferably 1.5 GPa or higher, more preferably 60 GPa or higher, and even more preferably 70 GPa or higher. The Young's modulus of the display panel 3 is preferably 90 GPa or lower, more preferably 75 GPa or lower. The upper and lower limits can be appropriately combined; that is, the Young's modulus of the display panel 3 is preferably 1.5 GPa or higher and 90 GPa or lower, more preferably 60 GPa or higher and 75 GPa or lower, and even more preferably 70 GPa or higher and 75 GPa or lower.

[0057] The thickness of the display panel 3 is preferably 0.05 mm or more and 2.0 mm or less, more preferably 1.0 mm or more and 1.3 mm or less, and even more preferably 1.1 mm or more and 1.3 mm or less. The thickness of the display panel 3 is the length in the Z direction from the main surface on the Z1 side to the main surface on the Z2 side.

[0058] like Figure 1 As shown, when viewed from the Z direction, the distance from the end of the cover plate member 2 on the Y1 side to the end of the display panel 3 on the Y1 side is defined as distance S1. From the viewpoint of ensuring the cover plate member 2 is bonded with sufficient adhesive strength, distance S1 is preferably 2 mm or more and 30 mm or less, more preferably 5 mm or more and 20 mm or less. Furthermore, the numerical range of distance S1 can also be applied to the distance from the end of the cover plate member 2 on the Y2 side to the end of the display panel 3 on the Y2 side.

[0059] In addition, such as Figure 1 As shown, when viewed from the Z direction, the distance from the end of the cover plate member 2 on the X1 side to the end of the display panel 3 on the X1 side is defined as distance S2. From the viewpoint of adhesive strength and appearance design, distance S2 is preferably 2 mm or more and 200 mm or less, more preferably 5 mm or more and 150 mm or less. Furthermore, the numerical range of distance S2 can also be applied to the distance from the end of the cover plate member 2 on the X2 side to the end of the display panel 3 on the X2 side.

[0060] (Backlight unit)

[0061] The backlight unit 4 is a light source that illuminates the display panel 3 for image display, and is arranged on the Z2 side of the display panel 3 in a manner that overlaps with the display panel 3.

[0062] The backlight unit 4 is generally composed of components such as a lens, diffuser, light guide plate, lamp, and reflector. Among these components, the light guide plate is usually the thickest, and it determines the overall rigidity of the backlight unit 4. Therefore, the Young's modulus of the light guide plate can be regarded as the Young's modulus of the backlight unit 4.

[0063] The Young's modulus of the backlight unit 4 is preferably 1 GPa or more and 90 GPa or less, more preferably 2 GPa or more and 85 GPa or less, and even more preferably 60 GPa or more and 85 GPa or less.

[0064] The thickness of the backlight unit 4 is preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 6 mm or less, and even more preferably 3 mm or more and 5 mm or less. The thickness of the backlight unit 4 is the length in the Z direction from the main surface on the Z1 side to the main surface on the Z2 side of the backlight unit 4.

[0065] Alternatively, the backlight unit 4 may not be provided in the display device 1. In this case, the display device 1 is arranged in the Z2 direction with the cover plate member 2, the display panel 3, and the bottom member 5 arranged in sequence (overlapping). When the backlight unit 4 is not provided, a self-emissive display panel that does not require a backlight unit 4, such as an organic EL panel or a micro LED panel, can be selected as the display panel 3.

[0066] (Bottom component)

[0067] The bottom component 5 is disposed on the Z2 side of the display panel 3 (backlight unit 4 in this embodiment) in a manner that overlaps with the display panel 3 (backlight unit 4 in this embodiment), and can be described as the bottom part of the housing.

[0068] The bottom component 5 may include a plate portion 6 and a rib portion 7. The plate portion 6 is a plate-shaped component arranged to overlap with the display panel 3. The rib portion 7 is a component formed by protruding from the main surface 6A on the Z2 side of the plate portion 6, and in this embodiment, it is a quadrangular prism. By setting the bottom component 5 to have the shape of the rib portion 7, the display device 1 can be made lighter compared to a plate shape with a wall thickness without the rib portion 7.

[0069] Figure 4 This is a bottom view of the bottom component. For example... Figure 4 As shown, when viewing the bottom member 5 of this embodiment from direction Z2 towards direction Z1, multiple ribs 7 are provided in a lattice pattern in the bottom member 5. Specifically, in Figure 4 Multiple ribs 7 (ribs 71, 72, 73, and 74) extending along the Y direction and in Figure 4 Multiple ribs 7 (ribs 75, 76, and 77) extending along the X direction intersect. However, the shape of the ribs 7 is not limited to... Figure 3 The shape can be arbitrary; for example, it can be curved instead of straight, or it can be non-grid-like. Furthermore, the bottom member 5 may not have ribs 7. In this case, the bottom member 5 consists only of plate 6.

[0070] exist Figure 3In the middle, a fixing point P is formed on the main surface 5A on the Z2 side of the bottom component 5. The fixing point P is the part that serves as the connection part (interface) for fixing the bottom component 5 to the vehicle (in this embodiment, the interior part 10), and in this embodiment, it is the part where the bracket 9 described later is installed.

[0071] The bottom component 5 is fixed to the bracket 9 while the main surface 5A is in contact with the fixed component (here, the bracket 9). If the area in the main surface 5A that contacts the fixed component is defined as the contact area, then the fixing point P can be considered a point on the contact area. The fixing point P can be any position on the contact area, for example, at... Figure 1 In the diagram, fixed points P (fixed points P1 to P4) are shown as the midpoints of the edges of each contact area located in the Y2 direction along the X direction. Thus, a fixed point P can also be the midpoint of the edge of the contact area located in the Y2 direction along the X direction. Furthermore, it can be said that one fixed point P is formed in each contact area. That is, it can be said that when there are multiple fixed points P, multiple contact areas are formed at separate locations, and one fixed point P is formed in each contact area. It can also be said that when there is only one fixed point P, there is only one contact area.

[0072] For example, when the display device 1 (bottom member 5) is fixed to the bracket 9, the fixing point P can be set at the midpoint of one side of the end of the convex surface 9a of the bracket 9 on the main surface 5A (i.e., the midpoint of the side of the contact area in the X direction on the Y2 side). Alternatively, when the bottom member 5 is fixed to the bracket 9 by bolts or other fasteners, the fixing point P can be a location on the main surface 5A with holes (e.g., bolt holes) for inserting fasteners. When the bottom member 5 is fixed to the bracket 9 by multiple fasteners in each contact area, the fixing point P can be the central location of the locations with holes (e.g., bolt holes) for inserting fasteners. Furthermore, when the bottom member 5 is fixed to the bracket 9 by adhesive or the like, the fixing point P can be a point on the contact area of ​​the main surface 5A coated with adhesive. Additionally, for example, there is a case where a protrusion is formed on the main surface 5A of the bottom member 5, and the protrusion is inserted into a recess formed in the vehicle (in this embodiment, the interior part 10) to fix it to the vehicle. In this case, a separate bracket 9 is not required; instead, the protrusion of the bottom member 5 can be considered as the bracket 9. In this case, the surface of the protrusion of the bottom member 5 in the Z1 direction becomes the contact area, and a point on the contact area is designated as the fixing point P. Alternatively, for example, there may be a case where a recess is formed on the main surface 5A of the bottom member 5, and a protrusion formed on the vehicle (in this embodiment, the interior part 10) is inserted into the recess on the main surface 5A and fixed to the vehicle. In this case, a separate bracket 9 is not required; instead, the protrusion of the vehicle can be considered as the bracket 9. In this case, the surface of the recess of the bottom member 5 in the Z1 direction becomes the contact area, and a point on the contact area is designated as the fixing point P. The position of the fixing point P, etc., will be described later.

[0073] The Young's modulus Ed of the bottom component 5 is preferably 1.5 GPa or more, more preferably 30 GPa or more, and even more preferably 40 GPa or more. The Young's modulus Ed of the bottom component 5 is preferably 250 GPa or less, more preferably 100 GPa or less, and even more preferably 80 GPa or less.

[0074] Furthermore, the display device according to this embodiment is preferably a reinforced glass with a compressive stress layer thickness of 10 μm or more, a Young's modulus Ecg of 60 GPa or more and 90 GPa or less, and a Young's modulus Ed of 40 GPa or more and 250 GPa or less for the bottom component 5.

[0075] The material used for the base component 5 is preferably a metal (monomer) or alloy containing metallic elements such as aluminum and magnesium. Alternatively, the material for the base component 5 may be resin, or a laminate of resin and metal layers.

[0076] In this embodiment, the bottom component 5 is positioned at the position closest to the Z1 direction in the components of the display device 1, but it is not limited to this. For example, other components may be provided at a position closer to the Z1 direction than the bottom component 5. That is, even if other components exist at a position closer to the Z1 direction than the bottom component 5, the layer (bottom component 5) that forms the fixing point P is considered as the bottom component in this embodiment. In other words, the layer that forms the fixing point P and is located at the position closest to the Z1 direction is considered as the bottom component 5.

[0077] (surrounding parts)

[0078] The surrounding component 8 is a frame-shaped component that surrounds the cover plate component 2, the display panel 3, and the backlight unit 4 when viewed from the Z direction; it can be described as the side wall of the housing.

[0079] The surrounding components 8 include frame components and sidewall components.

[0080] The frame component refers to the frame-shaped portion surrounding the cover plate component 2, and specifically, the portion of the surrounding component 8 that is further towards the Z1 direction than the second main surface 2B of the cover plate component 2. That is, it can be said that the frame component is adjacent to the end face 2C of the cover plate component 2 on the outer side. Here, "outer side" refers to the radially outer side when the central axis of the cover plate component 2 along the Z direction is set as the axial direction, as will be the case hereinafter. The central axis of the cover plate component 2 refers to the axis extending along the Z direction from the center point of the cover plate component 2 when viewed from the Z direction.

[0081] On the other hand, the sidewall component refers to the part surrounding the display panel 3 (and the backlight unit 4) (the part disposed around the display panel 3), and refers to the part of the surrounding component 8 located on the Z2 side of the second main surface 2B of the cover component 2.

[0082] like Figure 2 As shown, in this embodiment, the surrounding component 8 includes a frame component 8a and sidewall components 8b and 8c. In this embodiment, the frame component 8a and the sidewall component 8b are integral components. The sidewall component 8b is connected to the end of the frame component 8a on the Z2 side and protrudes inward from the frame component 8a. Here, "inward" refers to the radially inward side when the central axis of the cover plate component 2 along the Z direction is set as the axial direction, and the same applies below. The sidewall component 8b supports the outer periphery of the second main surface 2B of the cover plate component 2 on the Z1 side of the area protruding inward from the frame component 8a. In this embodiment, although not shown, the sidewall component 8b and the cover plate component 2 are bonded via an adhesive layer.

[0083] The sidewall component 8c is a frame-shaped component disposed on the Z2 side of the sidewall component 8b, and in this embodiment, it is configured to surround the display panel 3 and the backlight unit 4. In this embodiment, the surface of the sidewall component 8c on the Z1 side is bonded to the sidewall component 8b via an adhesive layer.

[0084] The shape of the surrounding components 8 (frame components and sidewall components) is not limited to the above description and can be arbitrary. For example, frame component 8a and sidewall component 8b can also be independent components. In addition, for example, the sidewall component can be composed of one component or three or more components.

[0085] The Young's modulus of the surrounding components 8 (frame components and sidewall components) is preferably 1 Pa or more and 250 GPa or less, more preferably 40 GPa or more and 230 GPa or less. Furthermore, when the sidewall components and frame components are composed of multiple components, the Young's modulus of each component is preferably within the above range.

[0086] The material used for the surrounding components 8 (frame components and sidewall components) is preferably a metal (monomer) or alloy containing metallic elements such as aluminum and magnesium. Alternatively, the material for the surrounding components 8 (frame components and sidewall components) can be resin, or a laminate of resin and metal layers. Furthermore, when the surrounding components 8 (frame components and sidewall components) are composed of multiple components, each component can be formed from a different material. For example, in... Figure 2 In the structure shown, the frame component 8a and the side wall component 8b can be made of resin, while the side wall component 8c can be made of metal.

[0087] Furthermore, in this embodiment, the surrounding component 8 and the bottom component 5 can be different components or they can be a single integrated component. Alternatively, for example, some of the multiple components constituting the surrounding component 8 may be integrated with the bottom component 5, while other parts may be separate from the bottom component 5. Figure 2 The example illustrates a structure in which the side wall component 8c is integrated with the bottom component 5, while the frame component 8a and the side wall component 8b are separate from the bottom component 5.

[0088] (2. Fixed state of the display device)

[0089] Next, the state in which the display device 1 is fixed to the interior part 10 of the vehicle will be described. The following describes the fixing of the display device 1.

[0090] (Fixed point)

[0091] As described above, a fixing point P is formed on the main surface 5A of the bottom component 5 in the Z2 direction of the display device 1, which is fixed relative to the inner part 10. In this embodiment, multiple fixing points P are provided. Figure 1In this example, four fixed points P1, P2, P3, and P4 are set. Fixed points P1 and P2 are arranged along the X direction (the width direction of the vehicle when installed on a vehicle). Fixed points P3 and P4 are located on the Y2 side (the vertically downward side when installed on a vehicle) relative to fixed points P1 and P2, and are arranged along the X direction. The lines passing through fixed points P1 and P2 are parallel to the lines passing through fixed points P3 and P4, and fixed points P1 to P4 form the four vertices of a rectangle.

[0092] like Figures 1-3 As shown, a bracket 9, serving as a fixing component, can be installed at a fixed point P. In this case, the bottom component 5 is fixed to the inner part 10 via the bracket 9. In the example of this embodiment, a bracket 91 is installed at fixed point P1, a bracket 92 is installed at fixed point P2, a bracket 93 is installed at fixed point P3, and a bracket 94 is installed at fixed point P4.

[0093] like Figure 3 As shown, the bracket 9 is a long, plate-like component, bent into a U-shape. The center of the bracket 9 in the width direction is located at the fixed point P. The convex surface 9a formed by the U-shaped bend of the bracket 9 ( Figure 3 One end of the bracket 9 (on the Y2 side of the surface) is connected to the fixing point P. The direction of the bracket 9 perpendicular to the convex surface 9a intersects the X direction (the width direction of the vehicle) perpendicularly. The bracket 9 is configured such that one surface 9b connected to the convex surface 9a is connected to the bottom part 5, and another surface 9c connected to the convex surface 9a is connected to the interior part 10. That is, the position where the midpoint of one end of the convex surface 9a of the main surface 5A of the bottom part 5 overlaps with the midpoint of one end of the bracket 9 (i.e., the midpoint of the side of the contact area on the Y2 side in the X direction) becomes the fixing point P. The bracket 9 is fixed to the bottom part 5 and the interior part 10, for example, by screws (not shown). The shape of the bracket 9 is not limited to the above description but is arbitrary, for example, it can be bent into an S-shape.

[0094] The display device 1 is thus mounted on the vehicle via the bracket 9, so it can be said that the display device 1 and the bracket 9 constitute a display device unit.

[0095] Alternatively, the base component 5 may not use the bracket 9, but rather a portion of the base component 5 may be deformed and fixed to the inner part 10. Conversely, a portion of the inner part 10 may be deformed and fixed to the base component 5. In this case, each fixing point P may be defined as the center of each fixing part.

[0096] The location and number of fixed points P are not limited to those described above. Any number of fixed points P can be formed, and the location of each fixed point P can also be arbitrary.

[0097] (Midpoint PQ)

[0098] The following explanation will focus on the position of fixed point P relative to the Y-direction of display device 1 (YH / YH as described below). cg The intermediate point PQ is defined as the midpoint between fixed points P1 and P2. If the distance between the intermediate point PQ and fixed point P1 (or the distance between the intermediate point PQ and fixed point P2) is set as distance X, then from the viewpoint of vibration characteristics (JIS D 1601:1995 Vibration Test Method for Automotive Components), distance X is preferably 30 mm or more and 200 mm or less, more preferably 50 mm or more and 130 mm or less. Similarly, if the distance between fixed points P1 and P3 (or P2 and P4) arranged along the Y direction is set as distance Y, then for the same reason, distance Y is preferably 30 mm or more and 200 mm or less, more preferably 35 mm or more and 125 mm or less.

[0099] As mentioned above, since the number and location of fixed points P are arbitrary, the definition of the intermediate point PQ under each change in the location of fixed point P will be explained below.

[0100] Among the fixing points P set on the bottom component 5, two fixing points P are selected from the Y1 direction side (vertically upward), and the midpoint of the two selected fixing points P is set as the intermediate point PQ. For example, in Figures 1-3 The diagram shows the bottom component 5 fixed to the inner part 10 by four fixing points P (fixing points P1 to P4) arranged in pairs along the Y direction. Figures 1-3 As shown, when there are multiple fixed points P in the Y direction, the two fixed points closest to the Y1 direction are used (in... Figure 1 In the middle, fixed points P1 and P2 are used as fixed points P to define the intermediate point PQ (and, consequently, the imaginary surface R described later).

[0101] When there are three or more fixed points P at the same position (at the same height) in the Y direction, select the two fixed points P with the narrowest interval between them, and set their midpoint as the intermediate point PQ. When there are three or more fixed points at the same position with equal intervals in the Y direction, set the midpoint of any two fixed points P as the intermediate point PQ. That is, when there are multiple candidate intermediate points PQ (and, moreover, the hypothetical surface R described later), any one of them can satisfy the necessary conditions of this embodiment.

[0102] The bottom component 5 can also be fixed to the inner part 10 via three fixing points P. For example, if referenced Figure 1 To illustrate, we assume the following: there are no fixed points P1 and P2; instead, there exists another fixed point P′ on the line connecting fixed points P1 and P2 (in... Figure 1 (Not shown in the diagram). In this case, the bottom component 5 is fixed to the interior part 10 via three points: fixing point P3, fixing point P4, and fixing point P′. If there is no difference in position (height) in the Y direction between fixing points P3 and P4, a fixing point closer to fixing point P′ is selected, and the midpoint between the selected fixing point and fixing point P′ is set as the intermediate point PQ. If there is no difference in distance between fixing points P3 and P4, either fixing point is selected, and the midpoint between the selected fixing point and fixing point P′ is set as the intermediate point PQ. Furthermore, if fixing points P3 and P4 are at different positions in the Y direction, similar to the method using four fixing points P, two fixing points P (fixing points P′, P3, and P4 on the Y1 side) are selected from the direction Y1 side, and the midpoint between the selected fixing points is set as the intermediate point PQ.

[0103] (YH / YH) cg )

[0104] like Figure 3 As shown, the plane passing through the midpoint PQ and perpendicular to the line connecting fixed points P1 and P2 (the two fixed points P used in the definition of midpoint PQ) is designated as the imaginary plane R. Additionally, as... Figure 3 As shown, the length of the intersection line between the cover plate component 2 and the imaginary surface R is set as the distance YH. cg Additionally, such as Figure 3 As shown, the distance YH is defined as the length from the top end (the end in the direction Y1) of the display panel 3 to the point corresponding to the midpoint PQ in the line where the main surface of the display panel 3 intersects with the imaginary surface R. The "point corresponding to the midpoint PQ" is the point on the main surface of the display panel 3 that is positioned by moving the midpoint PQ in the thickness direction (Z direction) of the display device 1.

[0105] The display device 1 is preferably configured to make the distance YH and the distance YH cg The ratio of YH / YH cg The position of the fixed point P is set to be 0.5 or less. That is, it can also be said that the display device 1 is preferably a "dashboard-in-dashboard" or "dashboard-on-dashboard" (hereinafter, also simply "dashboard-in-dashboard") display device that is also fixed near its upper end to the interior part 10. The ratio YH / YH of the display device 1... cg More preferably, it is 0.1 or more and 0.5 or less, and even more preferably, it is 0.3 or more and 0.5 or less.

[0106] Furthermore, in comparison YH / YH cg If the value is greater than 0.5, it can be said to be equivalent to a "standing type" where only the lower end of the bottom component is fixed to the dashboard.

[0107] That is, the bottom component 5 according to this embodiment has a plate portion 6 and a rib portion 7 protruding from the main surface of the plate portion 6 on the side opposite to the first direction (direction Z2 side), and at least two fixing points P are formed on the main surface on the side opposite to the first direction (direction Z2 side) to be fixed relative to the vehicle. An imaginary surface R is defined as the imaginary surface passing through the midpoint PQ of the two fixing points P and perpendicular to the line connecting the two fixing points P. The length of the intersection line between the main surface of the cover plate component 2 and the imaginary surface R is defined as the distance YH. cg If the length from the top of the intersection line between the main surface of the display layer (display panel 3) and the imaginary surface R to the point corresponding to the midpoint PQ is set as distance YH, then distance YH and distance YH cg The ratio of YH / YH cg Preferably, it is below 0.5.

[0108] The display device 1 is fixed to the vehicle as described above.

[0109] (3. Structures used to prevent breakage of cover plate components)

[0110] The cover plate component 2 involved in this embodiment has a thickness tcg of 0.3 mm or more and 0.7 mm or less, which is relatively thin. Through careful research, the inventors discovered that the deformation pattern of the cover plate component 2 with this thickness upon impact differs from that of thicker cover plate components. Furthermore, the inventors found that by setting the parameter T, described below, to an appropriate range, it is possible to suppress the cracking of the cover plate component 2 with this thickness.

[0111] The structure used to suppress the cracking of cover plate component 2 will be described below. Figure 5 This is a partially enlarged view of the cross-section of the display device according to this embodiment. Figure 5 yes Figure 1 A partially enlarged view of the B-B section. The B-B section refers to the section perpendicular to the X direction at the location of the reference point H (described later) in the X direction.

[0112] (Parameter A)

[0113] The parameter A used to specify parameter T is set to the value shown in equation (1).

[0114] A = Ecg × tcg 2 ・・・(1)

[0115] In equation (1), Ecg is the Young's modulus (GPa) of the cover plate component 2, and tcg is the thickness (mm) of the cover plate component 2. That is, parameter A is a parameter representing the rigidity of the cover plate component 2.

[0116] (Parameter B)

[0117] The parameter B used to specify parameter T is set to the value shown in equation (2).

[0118] B = Σ(Eb × tb) 2 )・・・(2)

[0119] In equation (2), Eb is the Young's modulus (GPa) of the sidewall component. Additionally, tb is the thickness (mm) of the portion of the sidewall component that protrudes outward from the end face 2C of the cover plate component 2. When the sidewall component is made of two or more materials, parameter B is a parameter representing the total stiffness of each portion of the material protruding outward from the end face 2C of the cover plate component 2 (i.e., the value obtained by multiplying the "Young's modulus" of each portion by the "square of the thickness"). Furthermore, when the sidewall component is made of two or more materials and the thickness of the portion protruding outward from the end face 2C of each material is not uniform, the thickness of the sidewall component at a point 0.5 mm away from the end face 2C can be set as tb.

[0120] exist Figure 5 In the example, a portion of sidewall component 8b and a portion of sidewall component 8c protrude outwards from the end face 2C of cover component 2. Therefore, when the thickness of the portion of sidewall component 8b protruding outwards from the end face 2C is set as thickness tb1, the Young's modulus of sidewall component 8b is set as Eb1, the thickness of the portion of sidewall component 8c protruding outwards from the end face 2C is set as thickness tb2, and the Young's modulus of sidewall component 8c is set as Eb2, parameter B is (Eb1 × tb1) / ( ... 2 ) + (Eb2×tb2) 2 ).

[0121] The value of parameter B is preferably greater than 0. By setting the value of parameter B to this range, it is possible to appropriately suppress the cracking of the cover plate component 2.

[0122] (Parameter C)

[0123] The parameter C used to specify parameter T is set to the value shown in equation (3).

[0124] C=Σ(Eb×tc)・・・(3)

[0125] In equation (3), tc represents the protrusion length (mm) of the portion of the sidewall component that protrudes outward from the end face 2C of the cover plate component 2. When the sidewall component is made of two or more materials, parameter C is a parameter representing the total stiffness of each portion of the material protruding outward from the end face 2C of the cover plate component 2 (i.e., the value obtained by multiplying the "Young's modulus" of each portion by the "protrusion length"). Figure 5In the example, the distance in the X direction between the outer surface of the portion of the sidewall component protruding from the end face 2C of the cover plate component 2 and the end face 2C can be considered as the protrusion length tc. Furthermore, if the protrusion length of the portion protruding outward from the end face 2C is not uniform, the average value of the protrusion length at each position can also be set as the protrusion length tc.

[0126] exist Figure 5 In the example, a portion of sidewall component 8b and a portion of sidewall component 8c protrude outwards from the end face 2C of cover component 2. Therefore, when the protrusion length of the portion of sidewall component 8b protruding outwards from the end face 2C is set as protrusion length tc1, the Young's modulus of sidewall component 8b is set as Eb1, the protrusion length of the portion of sidewall component 8c protruding outwards from the end face 2C is set as protrusion length tc2, and the Young's modulus of sidewall component 8c is set as Eb2, the parameter C is (Eb1×tc1) + (Eb2×tc2).

[0127] Furthermore, the protrusion length tc is preferably greater than 0 mm. That is, the display device 1 preferably includes a sidewall portion having a portion that protrudes outward from the end face 2C of the cover plate member 2.

[0128] (Parameter D)

[0129] Set the parameter D used to specify parameter T to the value shown in equation (4).

[0130] D = Ed × td 2 ・・・(4)

[0131] In equation (4), Ed is the Young's modulus (GPa) of the bottom component 5, and td is the thickness (mm) of the bottom component 5. That is, parameter D is a parameter representing the rigidity of the bottom component 5. In addition, the thickness td of the bottom component 5 here refers to the thickness of the area (overlapping area) where it overlaps with the cover plate component 2 when viewed from the Z direction in the entire region of the bottom component 5.

[0132] Parameter D is preferably 50 or more and 700 or less, more preferably 70 or more and 500 or less. By setting the lower limit of parameter D to this range, it is possible to fix it appropriately relative to the vehicle, and by setting the upper limit to this range, it is possible to absorb impact and appropriately suppress the breakage of the cover plate component 2.

[0133] More specifically, in this embodiment, the thickness td refers to the thickness at position M, located 10 mm inward from the position where it overlaps with the end face of the display panel 3 when viewed from the Z direction, within the overlapping area of ​​the bottom member 5. However, for example, if the thickness of the bottom member 5 at position M is locally increased or decreased due to local unevenness (e.g., the thickness at position M deviates from the average thickness of the overlapping area of ​​the bottom member 5 by more than 50%), a relatively flat area within 50 mm around position M that avoids local unevenness can be used as position M', and the thickness of position M' can be used as the thickness td.

[0134] Alternatively, if a rib 7 is provided on the bottom part 5 within 100 mm around positions M and M', the thickness td can be set to the value shown in formula (A). Figure 6 This is a schematic enlarged view of a bottom component with ribs.

[0135]

[0136] In equation (A),

[0137] a is as follows Figure 6 The thickness (mm) of the plate portion 6 of the bottom component 5 in the Z direction.

[0138] w2 is as follows Figure 6 The width (mm) of the first rib Rb1 shown.

[0139] w1 is as follows Figure 6 The distance (mm) between the first rib Rb1 and the second rib Rb2 is shown.

[0140] h is as follows Figure 6 The thickness (mm) of the first rib Rb1 and the second rib Rb2 in the Z direction is shown.

[0141] Specifically, the first rib Rb1 is the rib 7 closest to position M (or position M') among the ribs 7 of the bottom component 5. The second rib Rb2 is the rib 7 located on the line connecting position M (or position M') and the first rib Rb1, and closest to the first rib Rb1. In other words, the second rib Rb2 is the rib located in the direction extending through the line passing through the first rib Rb1 and position M (or position M') and perpendicular to the centerline of the first rib Rb1.

[0142] Furthermore, the width of the first rib Rb1 refers to the width of the first rib Rb1 when viewed from its extension direction. Additionally, the distance between the first rib Rb1 and the second rib Rb2 refers to the distance between the central axis of the first rib Rb1 and the central axis of the second rib Rb2 when viewed from its extension direction. More specifically, the distance between the first rib Rb1 and the second rib Rb2 can also be described as the distance between the first rib Rb1 (rib 73) and the second rib Rb2 (rib 75) on the perpendicular line passing through point p (the distance between their centerlines). Furthermore, when the thicknesses of the first rib Rb1 and the second rib Rb2 in the Z-direction are different, h can be the average of the thicknesses of the first rib Rb1 and the second rib Rb2 in the Z-direction.

[0143] In equation (A), b is represented by equation (B).

[0144]

[0145] The thickness td of the bottom component 5 is preferably 0.5 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less, and even more preferably 1 mm or more and 3 mm or less. By setting the lower limit of the thickness td to this range, it can be properly fixed relative to the vehicle, and by setting the upper limit to this range, it can absorb impact and appropriately suppress the breakage of the cover component 2.

[0146] (Reference point H)

[0147] The reference position of section B-B, i.e., reference point H, is explained.

[0148] like Figure 1 As shown, on the corner 2D (the boundary between the first main surface 2A and the end surface 2C) of the cover plate component 2 in the Y1 direction, an equidistant point H0 is defined as a point where the distances from the two fixed points P used in defining the intermediate point PQ are equal when viewed from the Z direction. In this embodiment, since fixed points P1 and P2 are used in the definition of the intermediate point PQ, it can be said that the equidistant point H0 is a point on the corner 2D of the cover plate component 2 in the Y direction where the distances from fixed point P1 and fixed point P2 are equal when viewed from the Z direction. That is, in this embodiment, the distance from the equidistant point H0 to the fixed point P1 when viewed from the Z direction is equal to the distance from the equidistant point H0 to the fixed point P2 when viewed from the Z direction.

[0149] Additionally, in the extending direction of the corner 2D on the Y-direction side of the cover plate component 2 (in Figure 1 In the example (in the X direction), the positions on the corner 2D, which is separated from the equidistant point H0 by a specified distance D1, are designated as points H1 and H2. That is, in Figure 1 In the example, the position on corner 2D, separated from the equidistant point H0 by a predetermined distance D1 in the direction X2, is point H1, and the position on corner 2D, separated from the equidistant point H0 by a predetermined distance D1 in the direction X1, is point H2. In this case, on the corner 2D on the Y-direction side of the cover plate component 2, any position between point H1 and point H2 is set as the reference point H. The predetermined distance D1 can be set arbitrarily, but for example, it can be 18 mm.

[0150] The reference point H can be any position between points H1 and H2 on the corner 2D on the Y-direction side, but it is preferably set to the position with the least rigidity among all positions between points H1 and H2 on the corner 2D on the Y-direction side. In the example of this embodiment, the position with the least rigidity among all positions between points H1 and H2 is the equidistant point H0, so the equidistant point H0 is regarded as the reference point H.

[0151] However, the reference point H is not limited to the position with the least rigidity between points H1 and H2. For example, rigidity can be disregarded, and the equidistant point H0 can be regarded as the reference point H.

[0152] In addition, the reference point H can be, for example, the location of the impact point where the impactor strikes the head in a head impact test.

[0153] In addition, such as Figure 2 As shown, an imaginary line V is defined as a line passing through the reference point H and the bottom component 5 and inclined at an angle θ relative to the Z direction. That is, it can be said that the imaginary line V is a line passing through the reference point H and inclined inward at an angle θ relative to the Z direction. In this embodiment, the angle θ is 30° or more and 45° or less. It can be said that the imaginary line V corresponds to the direction in which a high impact is transmitted when an impact is applied to the diagonal portion 2D, such as in a head impact test.

[0154] (Parameter T)

[0155] Next, we will explain the parameter T. Set the parameter T to the value shown in equation (5).

[0156] T=0.212245+A(-0.00997+0.000124×B+0.0000362×C-0.000022×D-0.00809×G)-0.00817×B-0.00183×C+0.001722×D+0.957752×G・・・(5)

[0157] like Figure 5As shown, G in equation (5) is the protrusion length (mm) of the first main surface 2A of the cover plate component 2, extending from the surface 8aA on the Z1 side of the frame component 8a towards the Z1 direction. That is, for example, when the first main surface 2A protrudes 2mm beyond the surface 8aA towards the Z1 direction, the protrusion length G is +2mm; when the surface 8aA protrudes 2mm beyond the first main surface 2A towards the Z1 direction, the protrusion length G is -2mm. Figure 5 The text describes a structural example where the first principal surface 2A protrudes towards the Z1 direction from the surface 8aA. Additionally, in... Figure 5 The diagram shows a structural example in which an adhesive layer 2E is provided on the second main surface 2B of the cover plate component 2 to bond the second main surface 2B to the side wall component 8b and the display panel 3.

[0158] The parameter T, as specified above, is less than 0, preferably less than -0.1, and more preferably less than -0.2.

[0159] The inventors have discovered that when an impact is applied to the corner 2D along the imaginary line V (e.g., in a head impact test), strong tensile stress is generated on the display side (first main surface 2A side) located slightly inside the end face 2C of the cover plate member 2. To address this, the inventors have discovered that by setting the parameter T to the aforementioned range, even under such conditions, it is possible to suppress the increase in tensile stress, thereby suppressing the breakage of the cover plate member 2. In other words, by designing the display device 1 such that the parameter T is within the aforementioned range, it is possible to suppress the breakage of the cover plate member 2.

[0160] (Parameter T1)

[0161] Alternatively, set parameter T1 to the value shown in equation (6).

[0162] T1=0.7416-0.01455×B-0.01685×A+0.000244×A×B・・・(6)

[0163] The parameter T1 is preferably less than 0, more preferably less than -0.1, and even more preferably less than -0.2. By keeping the parameter T1 within this range, the breakage of the cover plate component 2 can be more appropriately suppressed. That is, by increasing the parameter B, the cover plate component 2 can be properly protected by the side wall component, the stress on the cover plate component 2 can be reduced, and thus the breakage of the cover plate component 2 can be more appropriately suppressed.

[0164] Here, parameter B is preferably greater than 0, more preferably 15 or more, more preferably 50 or more, and even more preferably 70 or more. By placing parameter B within the above range, the rigidity of the sidewall component can be improved, the deformation of the cover plate component when an impact is applied to the diagonal portion 2D can be suppressed, and the generation of tensile stress can be reduced.

[0165] (Parameter T2)

[0166] Alternatively, set parameter T2 to the value shown in equation (7).

[0167] T2=0.313919-0.0045×C-0.01057×A-0.0000791×A×C・・・(7)

[0168] The parameter T2 is preferably less than 0, more preferably less than -0.1, and even more preferably less than -0.2. By keeping the parameter T2 within this range, the breakage of the cover plate component 2 can be more appropriately suppressed. That is, by increasing the parameter C, the cover plate component 2 can be properly protected by the side wall component, the stress on the cover plate component 2 can be reduced, and thus the breakage of the cover plate component 2 can be more appropriately suppressed.

[0169] (Parameter T3)

[0170] Alternatively, set parameter T3 to the value shown in equation (8).

[0171] T3=0.079709+0.001749×D-0.00791×A-0.000023×A×D・・・(8)

[0172] The parameter T3 is preferably less than 0, more preferably less than -0.1, and even more preferably less than -0.2. By keeping the parameter T3 within this range, the breakage of the cover plate component 2 can be more appropriately suppressed. That is, by reducing the parameter D, the bottom component 5 can be used to appropriately absorb the impact, reducing the stress on the cover plate component 2, and thus the breakage of the cover plate component 2 can be more appropriately suppressed.

[0173] (Parameter T4)

[0174] Alternatively, set parameter T4 to the value shown in equation (9).

[0175] T4=-0.40013+1.736071×G+0.00185×A-0.01998×G×A・・・(9)

[0176] The parameter T4 is preferably less than 0, more preferably less than -0.1, and even more preferably less than -0.2. By keeping the parameter T4 within this range, the breakage of the cover plate component 2 can be more appropriately suppressed. That is, by reducing the protruding length of the cover plate component 2, the stress on the cover plate component 2 can be reduced, and thus the breakage of the cover plate component 2 can be more appropriately suppressed.

[0177] Furthermore, in this embodiment, it is preferable that at least one of the parameters T1, T2, T3, and T4 is within the above-mentioned range (e.g., less than 0), but more preferably that at least parameter T1 is within the above-mentioned range, and even more preferably that all of the parameters T1, T2, T3, and T4 are within the above-mentioned range.

[0178] (Emphasis on length G)

[0179] Based on reasons such as the appearance design of the display device 1, the protrusion length G is preferably -0.7 mm or more and 3 mm or less, more preferably -0.55 mm or more and 2 mm or less, and even more preferably -0.55 mm or more and 1 mm or less. Even if the protrusion length G is relatively small, by setting the parameter T to the above range, it is possible to suppress the breakage of the cover plate component 2.

[0180] Furthermore, when the protrusion length G is within the aforementioned range, it is more preferable that the parameter T1 is 0.38 or less. Thus, even if the protrusion length G is relatively small, it is possible to appropriately suppress the breakage of the cover plate component 2.

[0181] (Effect)

[0182] As explained above, the display device 1 according to the first aspect of this disclosure includes: a bottom member 5; a display panel 3 (display layer) disposed on the bottom member 5; a side wall member disposed around the display panel 3; and a glass cover member 2 disposed on the display panel 3 and the side wall member, with a thickness tcg of 0.3 mm or more and 0.7 mm or less. When the direction from the bottom member 5 toward the cover member 2 in the thickness direction (Z direction) of the cover member 2 is defined as the first direction (direction Z1), the cover member 2 has a first main surface 2A on the side of the first direction, a second main surface 2B on the side opposite to the first main surface 2A, and an end surface 2C connecting the first main surface 2A and the second main surface 2B, with parameter T less than 0.

[0183] According to this disclosure, it is possible to appropriately suppress the cracking of the cover plate component 2 having this thickness.

[0184] The display device 1 according to the second aspect of this disclosure is preferably, in the display device according to the first aspect, a cover plate member 2 is a reinforced glass with a compressive stress layer thickness of 10 μm or more, a Young's modulus Ecg of the cover plate member 2 of 60 GPa or more and 90 GPa or less, and a Young's modulus Ed of the bottom member 5 of 40 GPa or more and 250 GPa or less. According to this disclosure, the cracking of the cover plate member 2 can be appropriately suppressed.

[0185] The display device 1 according to the third aspect of this disclosure is preferably, in the display device according to the first or second aspect, the protrusion length tc of the sidewall member is greater than 0 mm. According to this disclosure, since a sidewall portion including a portion protruding outward from the end face 2C of the cover plate member 2 is provided, the breakage of the cover plate member 2 can be appropriately suppressed.

[0186] The display device 1 according to the fourth aspect of this disclosure is preferably in which parameter B exceeds 0 in any of the first to third aspects of the display device. By setting parameter B to this range, it is possible to appropriately suppress the cracking of the cover plate member 2.

[0187] The display device 1 according to the fifth aspect of this disclosure is preferably in which the parameter T1 is less than 0 in any of the first to fourth aspects of the display device. By setting the parameter T1 to this range, it is possible to appropriately suppress the cracking of the cover plate member 2.

[0188] The display device 1 according to the sixth aspect of this disclosure is preferably, in any of the first to fifth aspects of the display device, the protrusion length G of the first main surface 2A of the cover member 2 is -0.7 mm or more and 3 mm or less. By setting the protrusion length G within this range, it is preferred in terms of appearance design and can appropriately suppress the breakage of the cover member 2.

[0189] The display device 1 according to the seventh aspect of this disclosure is preferably, in any of the first to sixth aspects of the display device, the thickness td of the bottom member 5 is 0.5 mm or more and 5 mm or less. By setting the thickness of the bottom member 5 to this range, it is possible to appropriately suppress the cracking of the cover member 2 and to appropriately fix the housing 1A.

[0190] The display device 1 according to the eighth aspect of this disclosure is preferably, in any of the first to seventh aspects of the display device, that the parameter D is 50 or more and 700 or less. By setting the parameter D to this range, it is possible to appropriately suppress the breakage of the cover plate member 2.

[0191] The display device 1 according to the ninth aspect of this disclosure is preferably, in any of the first to eighth aspects of the display device, the bottom member 5 has a plate portion 6 and a rib 7 protruding from the main surface of the plate portion 6 in the direction Z2, and at least two fixing points P are formed on the main surface in the direction Z2 to be fixed relative to the vehicle. An imaginary surface R is defined as an imaginary surface passing through the midpoint of the two fixing points P and perpendicular to the line connecting the two fixing points P. The length of the intersection line between the main surface of the cover plate member 2 and the imaginary surface R is defined as the distance YH. cgIf the length from the top to the point corresponding to the midpoint of the intersection line between the main surface of display panel 3 and the imaginary surface R is set as distance YH, then distance YH and distance YH cg The ratio of YH / YH cg The value is 0.5 or less. That is, the display device 1 is preferably an in-dashboard type. According to this disclosure, in the in-dashboard type display device 1, the breakage of the cover plate member 2 can be appropriately suppressed.

[0192] The display device 1 according to the tenth aspect of this disclosure is preferably, in any of the display devices according to the first aspect to the ninth aspect, the parameter T is -0.1 or less. By setting the parameter T to this range, it is possible to more appropriately suppress the cracking of the cover plate member 2.

[0193] The display device 1 according to the eleventh aspect of this disclosure is preferably, in any of the display devices according to the first to tenth aspects, that the parameter T is -0.2 or less. By setting the parameter T to this range, it is possible to further and appropriately suppress the cracking of the cover plate member 2.

[0194] (Example)

[0195] Next, the embodiments will be described. Furthermore, variations in the embodiments are possible as long as the effects of the invention are achieved.

[0196] In this embodiment, a simulation model of the display device 1 is generated, and a simulation of applying an impact to the simulation model of the display device 1 at a reference point H is performed, thereby simulating a head impact test. The models for each example are described below. Tables 1 to 4 are tables illustrating each example.

[0197] [Table 1]

[0198]

[0199] [Table 2]

[0200]

[0201] [Table 3]

[0202]

[0203] [Table 4]

[0204]

[0205] (Example 1)

[0206] In Example 1, a model of a display device was prepared, comprising a cover plate component, a display panel 3, side wall components, and a bottom component. That is, the model of display device 1 adopted... Figure 2 , Figure 5The structure described in the text.

[0207] In the model of display device 1 in Example 1, the dimensions of the cover plate component are set to 250 mm in the X direction, 150 mm in the Y direction, and 0.4 mm in the Z direction (thickness tcg is 0.4 mm), the thickness of the compressive stress layer is set to 20 μm, and the Young's modulus Ecg is set to 74 GPa.

[0208] In the model of display device 1, the size of display panel 3 is set to 170mm in the X direction, 125mm in the Y direction, and the thickness in the Z direction is set to 1.1mm.

[0209] In addition, the distance S1 between the Y-direction end of the cover plate component and the Y-direction end of the display panel 3 is set to 12.5 mm, and the distance S2 between the X-direction end of the cover plate component and the X-direction end of the display panel 3 is set to 40 mm.

[0210] In addition, for the side wall component (side wall component 1 in Table 1), the thickness tb1 is set to 2 mm, the protrusion length tc1 that protrudes outward from the end face of the cover plate component is set to 2.35 mm, and the Young's modulus Eb1 is set to 2.5 GPa.

[0211] In addition, for the bottom component, the dimensions in the X and Y directions are set to be the same as those of the cover plate component, the thickness td is set to 2mm, and the Young's modulus Ed is set to 70GPa.

[0212] In addition, a frame member is provided integrally with the side wall member (side wall member 1 in Table 1) to surround the cover plate member. The protrusion length G of the first main surface of the cover plate member on the Z1 side, which protrudes from the surface of the frame member on the Z1 side, is set to 0 mm. That is, the surface of the frame member on the Z1 side and the first main surface of the cover plate member on the Z1 side are made to be the same surface.

[0213] Furthermore, in the model of the display device, the surface on the Z2 side of the bottom component is made to have a ratio of YH / YH. cg The bracket is configured by setting the fixing point P to a value of 0.5. The position of each fixing point in the X direction is set to the center position between the end of the cover plate component in the X direction and the end of the display panel in the X direction.

[0214] The reference point H is set at a position on the corner of the cover plate component on the Y1 side, at a distance equal to that of the fixed points P1 and P2.

[0215] In addition, as shown in Table 1, the parameters T, T1, T2, T3, and T4 are calculated using equations (5) to (9).

[0216] (Example 2-Example 51)

[0217] In Examples 2-51, compared to Example 1, at least one of the following was changed: the thickness tcg of the cover plate component, the Young's modulus Ecg, the thickness tb1 of the sidewall component, the protrusion length tc1, the presence or absence of the second sidewall component (sidewall component 2 in Table 1), the thickness td of the bottom component, the Young's modulus Ed, and the protrusion length G, as shown in Tables 1-4, to generate the model. The thickness of the compressive stress layer was set to 20 μm. Furthermore, the second sidewall component (sidewall component 2 in Table 1) refers to the sidewall component located on the Z2 side of the first sidewall component (sidewall component 1 in Table 1). That is, the first sidewall component (sidewall component 1 in Table 1) and... Figure 5 The sidewall component 8b shown corresponds to the second sidewall component (sidewall component 2 in Table 1) and... Figure 5 The side wall component 8c shown corresponds to this.

[0218] (evaluate)

[0219] Perform a simulation in which the impactor collides with the reference point H of the model generated in each example under the following conditions.

[0220] • Impact energy of the impactor: 97 (J)

[0221] • Impactor weight: 6.8 (kg)

[0222] • Impactor diameter: 165 (mm)

[0223] • Impact angle of the impactor (the angle of inclination of the impactor's impact direction relative to the Z-direction): 55 (°)

[0224] (Evaluation Results)

[0225] The stress generated in the glass object when the impactor collides with the reference point H was obtained through simulation. Case A, where the maximum stress generated in the glass object is below 95% of the threshold for breakage, is designated as case B, where it is above 95% but less than 100%, and case C, where it is above 100%. Cases A and B are considered acceptable, while case C is considered unacceptable.

[0226] As shown in Tables 1-4, it can be seen that in the examples where parameter T is less than 0, namely Examples 6-15, 18, and 22-45, the evaluation result is qualified, and the cracking can be suppressed. On the other hand, it can be seen that in the comparative examples where parameter T is 0 or above, namely Examples 1-5, 16-17, 19-21, and 46-51, the evaluation result is unqualified, and the cracking cannot be suppressed.

[0227] The embodiments of the present invention have been described above, but the embodiments are not limited to the content of these embodiments. Furthermore, the above-described constituent elements include substantially the same constituent elements that can be easily conceived by those skilled in the art. Moreover, the above-described constituent elements can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the constituent elements can be made without departing from the spirit of the above-described embodiments.

[0228] Industrial availability

[0229] According to the present invention, a display device capable of suppressing breakage of the cover plate component can be provided.

[0230] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

[0231] This application is based on Japanese Patent Application No. 2023-123718, filed on July 28, 2023, the contents of which are incorporated herein by reference.

[0232] Explanation of reference numerals in the attached figures

[0233] 1... Display device; 1A... Housing; 2... Cover plate component; 2A... First main surface; 2B... Second main surface; 2C... End face; 3... Display panel; 4... Backlight unit; 5... Bottom component; 6... Plate; 7... Rib; 8... Surrounding component; 8a... Frame component; 8b, 8c... Side wall component; 9... Bracket; 10... Interior part.

Claims

1. A display device comprising: a base member; a display layer disposed on the base member; sidewall members disposed around the display layer; and a glass cover member disposed on the display layer and the sidewall members, having a thickness of 0.3 mm or more and 0.7 mm or less. The display device is characterized in that... When the direction from the bottom component toward the cover plate component in the thickness direction of the cover plate component is defined as the first direction, The cover plate component has a first main surface on a first direction side, a second main surface on the opposite side of the first main surface, and an end surface connecting the first main surface and the second main surface. When parameter A is set to the value shown in equation (1), parameter B is set to the value shown in equation (2), parameter C is set to the value shown in equation (3), parameter D is set to the value shown in equation (4), and parameter T is set to the value shown in equation (5), The parameter T is less than 0. A=Ecg×tcg 2 ・・・(1) B=Σ(Eb×tb) 2 ) ・・・(2) C=Σ(Eb×tc)・・・(3) D=Ed×td 2 ・・・(4) T=0.212245+A(-0.00997+0.000124×B+0.0000362×C-0.000022×D-0.00809×G)-0.00817×B-0.00183×C+0.001722×D+0.957752×G・・・(5) here, Ecg is the Young's modulus of the cover plate component, expressed in gigabytes of pressure (GPa). tcg is the thickness of the cover plate component, in mm. Eb is the Young's modulus of the sidewall component, in GPa. tb is the thickness of the portion of the sidewall component that protrudes outward from the end face of the cover plate component, in mm. tc is the protrusion length of the portion of the sidewall component that protrudes outward from the end face of the cover plate component, expressed in mm. Ed is the Young's modulus of the bottom component, in GPa. td represents the thickness of the bottom component, in mm. G is the protrusion length of the first main surface of the cover plate component, extending in the first direction from the surface of the frame component adjacent to the end face of the cover plate component on the outer side, and protruding in the first direction, in mm.

2. The display device according to claim 1, characterized in that, The cover plate component is reinforced glass with a compressive stress layer thickness of 10 μm or more. The Young's modulus Ecg of the cover plate component is above 60 GPa and below 90 GPa. The Young's modulus Ed of the bottom component is above 40 GPa and below 250 GPa.

3. The display device according to claim 1 or 2, characterized in that, The protruding length tc of the sidewall component is greater than 0 mm.

4. The display device according to claim 1 or 2, characterized in that, The value of parameter B is greater than 0.

5. The display device according to claim 1 or 2, characterized in that, The parameter T1 shown in equation (6) is less than 0. T1=0.7416-0.01455×B-0.01685×A+0.000244×A×B・・・(6).

6. The display device according to claim 1 or 2, characterized in that, The protrusion length G of the first main surface of the cover plate component is greater than -0.7 mm and less than 3 mm.

7. The display device according to claim 1 or 2, characterized in that, The thickness td of the bottom component is 0.5 mm or more and 5 mm or less.

8. The display device according to claim 1 or 2, characterized in that, The value of parameter D is above 50 and below 700.

9. The display device according to claim 1 or 2, characterized in that, The bottom component has a plate portion and a rib protruding from a main surface of the plate portion opposite to the first direction, and at least two fixing points for fixing relative to the vehicle are formed on the main surface opposite to the first direction. Let imaginary surface R be the imaginary surface that passes through the midpoint of the two fixed points and is perpendicular to the line connecting the two fixed points. Let the length of the line intersecting the main surface of the cover plate component and the imaginary surface R be the distance YH. cg When the length from the top of the intersection line between the main surface of the display layer and the imaginary surface R to the point corresponding to the midpoint is defined as distance YH, the distance YH and the distance YH cg The ratio of YH / YH cg It is below 0.

5.

10. The display device according to claim 1 or 2, characterized in that, The parameter T is below -0.

1.

11. The display device according to claim 1 or 2, characterized in that, The parameter T is below -0.2.

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