In-vehicle display device

Abstract

In-vehicle display device comprising n layers from a cover glass to a housing base element and comprising at least one display field halfway through its n layers, wherein one element of each layer comprises only one plate-shaped element, or comprises the plate-shaped element and a rib, the housing base element is attached to an inner section of a vehicle at at least two attachment points, If a virtual plane passing through an intermediate point between the two fixing points and perpendicular to a line connecting the two fixing points is defined as a virtual plane R, and a length of a section line between a main surface of the cover glass and the virtual plane R is defined as a distance Z cgis defined and a length on an intersection line between a main surface of the display field and the virtual plane R from a top end to a point corresponding to the intermediate point is defined as a distance Z, a ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less, and the n layers from the cover glass to the housing base element on a virtual line L, which runs through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfy the following equation (1), [Math. 1] S > ( 1 0.021 × t 1 2 + 0.068 − t 1 2 ) × E 1 In equation (1) the following applies: E1: Modulus of elasticity of the cover glass, t1: Thickness of the cover glass, and S is represented by the following equation (2), [Math. 2] S = E 2 ⋅ t 2 2 + ⋯ + E n ⋅ tn 2 In equation (2) the following applies: E2: Elastic modulus of a second layer, t2: Thickness of the second layer, E n : Elastic modulus of an nth layer, t n : Thickness of the nth layer, and a thickness t k any k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3), [Math. 3] tk = 3 a 3 + w 2 w 1 h 3 + 12 a ( b − a 2 ) 2 + 12 w 2 w 1 h ( h 2 + a − b ) 2 In equation (3) the following applies: a: Thickness of the plate-shaped element of the k-th layer, w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer through which the virtual line L passes, w1: Distance between rib Rb1 and rib Rb2, which are located in an extension direction of a line passing through point p on the plate-shaped element through which the virtual line L passes, and perpendicular to a center line of rib Rb1, h: Thickness of rib Rb1 and rib Rb2, and b is represented by the following equation (4), [Math. 4] b = 0.5 w 1 + a 2 + 0.5 w 2 ⋅ h 2 + w 2 ⋅ a ⋅ hw 1 ⋅ a + w 2 ⋅ h where n is an integer equal to 3 or greater, h is a number equal to 0 or greater, the elastic modulus has a unit GPa, and The thickness, distance, and width have the unit mm.

Description

TECHNICAL AREA

[0001] The present invention relates to a vehicle-internal display device. GENERAL STATE OF THE ART

[0002] In the prior art, an in-vehicle display device is present, comprising a display field and a cover glass.

[0003] As described in patent literature 1, for a cover glass of an in-vehicle display device it is necessary “with regard to safety to have excellent impact resistance to such an extent that the cover glass does not break even if the head or the like of an occupant hits the cover glass in a vehicle collision accident” (

[0005] ).

[0004] Patent literature 1 discloses that if a vehicle-internal display device comprising a cover glass, the “equation (I): P ≤ 0.0302t1 2+ 0.0039t1 + 0.0478” fulfills the requirements, the cover glass exhibits excellent impact resistance (

[0007] to

[0008] ). The P-value in “equation (I)” can be considered an index indicating the stiffness of the vehicle's internal display device. COUNTERPOINT LIST PATENT LITERATURE

[0005] Patent literature 1: WO2016 / 027812 BRIEF DESCRIPTION OF THE INVENTIONAL TECHNICAL TASK

[0006] The vehicle's internal display device typically includes a housing base element. The housing base element forms a housing that accommodates each section of the vehicle's internal display device.

[0007] The housing base element is attached to an inner section (such as a dashboard) of a vehicle via a fastening element, such as a bracket.

[0008] The vehicle-internal display device comprises a “standing display device” in which only a lower end of the housing base element is attached to a dashboard, and a “display device in the dashboard or display device on the dashboard” in which the vicinity of an upper end of the housing base element is also attached to a dashboard.

[0009] For the sake of simplicity, the “display device in or on the dashboard” will henceforth also be referred to as the “display device in the dashboard”.

[0010] Patent literature 1 essentially discloses only a vehicle-internal stationary display device (see Fig. 4 in PTL 1).

[0011] The in-vehicle display device in the dashboard has a smaller protrusion from the dashboard, is more rigid in a fixed position, and tends to have lower shock absorption compared to the in-vehicle upright display device.

[0012] Therefore, the vehicle's internal display device in the dashboard has an area with a stiffness required for the cover glass, so that it exhibits good impact resistance, which may differ from that of the vehicle's internal, upright display device. That is to say, the vehicle's internal display device in the dashboard may be insufficient to satisfy only the "equation (I)" described in patent literature 1.

[0013] In recent years, for the purpose of weight reduction or the like, a housing base element with a rib has been used in some cases, and taking this aspect into account, it is necessary to consider the rigidity of the vehicle's internal display device.

[0014] The present invention was made in consideration of the foregoing points and one of its objectives is to provide a vehicle-internal display device in or on the dashboard in which a cover glass has excellent impact resistance. SOLUTION TO THE TASK

[0015] As a result of intensive investigations, the inventors of the present invention have found that the preceding problem can be solved by adopting the following embodiment, and have completed the present invention.

[0016] That is to say, the present invention provides the following [1] to

[10] . [1] A vehicle-integrated display device comprising n layers from a cover glass to a housing base element and including at least one display field halfway through its n layers, wherein an element of each layer comprises only a plate-shaped element or the plate-shaped element and a rib, the housing base element being attached to an internal section of a vehicle at at least two attachment points, where a virtual plane passing through an intermediate point between the two attachment points and perpendicular to a line connecting the two attachment points is defined as a virtual plane R, and a length of a section line between a main surface of the cover glass and the virtual plane R is defined as a distance Z cgis defined as a length on an intersection line between a main surface of the display field and the virtual plane R from a top end to a point corresponding to the intermediate point, a distance Z, a ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less, and the n layers from the cover glass to the housing base element on a virtual line L passing through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device satisfy the following equation (1). [2] A vehicle-integrated display device comprising n layers from a cover glass to a housing base element and including at least one display field halfway through its n layers, wherein an element of each layer comprises only a plate-shaped element or the plate-shaped element and a rib, the housing base element being attached to an internal section of a vehicle at a mounting point, where a virtual plane passing through the mounting point and comprising a thickness direction and a vertical direction of the cover glass at the mounting point is defined as a virtual plane R, and a length of a section line between a principal surface of the cover glass and the virtual plane R is defined as a distance Z cgis defined and a length on an intersection line between a main surface of the display field and the virtual plane R from an upper end to a point corresponding to the attachment point is defined as a distance Z, a ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less, and the n layers from the cover glass to the housing base element on a virtual line L passing through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device satisfy the following equation (1). [3] The vehicle-internal display device according to [1] or [2], wherein the housing base element is attached to the inner section by means of a bracket. [4] The vehicle-internal display device according to one of [1] to [3], wherein the n layers from the cover glass to the housing bottom element on the virtual line L further satisfy the following equation (5). [5] The vehicle-internal display device according to one of [1] to [4], wherein the cover glass is a reinforced glass having a compressive stress layer thickness of 10 µm or more, wherein the cover glass has a thickness of 0.5 to 2.5 mm, wherein the cover glass has a modulus of elasticity of 60 to 90 GPa, the display field has a modulus of elasticity of 60 to 90 GPa and the housing base element has a modulus of elasticity of 40 to 250 GPa. [6] The vehicle-internal display device according to one of [1] to [5], wherein a deceleration of an impactor in a head-impact test is 50 G or more, in which the impactor collides with an impact point P on the main surface of the cover glass through which the virtual line L passes, such that an energy at the time of collision is 152 J. [7] The vehicle-internal display device according to one of [1] to [6], wherein, if a mass of the vehicle-internal display device per unit area of ​​the cover glass is defined as M, the following equations (6) and (7) are satisfied. [8] The vehicle-internal display device according to one of [1] to [7], further comprising a housing side wall which is provided at a position which faces an end surface of the display field, wherein a distance d1 between the end surface of the display field and the housing side wall is 2 mm or less. [9] Vehicle-internal display device according to one of [1] to [8], wherein a distance d2 between an end of the display field and an element closer to the housing base element than the display field is 1 mm or less.

[10] The vehicle-internal display device according to one of [1] to [9], wherein the n layers from the cover glass to the housing bottom element on the virtual line L satisfy the following equation (4A). ADVANTAGEOUS EFFECTS OF THE INVENTION

[0017] According to the present invention, it is possible to provide a vehicle-internal display device in or on the dashboard in which the cover glass has excellent impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. Figure 1 is a cross-sectional view illustrating an in-vehicle display device. [ Fig. 2] Fig. 2 is a cross-sectional view along a section line AA in Fig. 1. [ Fig. 3] Fig. Figure 3 is a schematic representation of a housing base element viewed from one rib side. [ Fig. 4] Fig. Figure 4 is a schematic representation illustrating an arrangement of brackets. [ Fig. 5] Fig. Figure 5 is a cross-sectional view illustrating the housing base element. [ Fig. 6] Fig. Figure 6 is a top view showing the ribs in Fig. 5 schematically illustrated. [ Fig. 7] Fig. Figure 7 is a schematic representation illustrating the ribs in the case where the position of a point p differs from that in Fig. 6 distinguishes. [ Fig. 8] Fig. Figure 8 is a schematic representation illustrating ribs in a lateral direction in addition to ribs in a longitudinal direction. [ Fig. 9] Fig. Figure 9 is a schematic representation illustrating a state in which the arranged ribs are not parallel to each other. [ Fig. 10] Fig. Figure 10 is a schematic representation illustrating a state in which a display panel is attached to a cover glass. [ Fig. 11] Fig. Figure 11 is an enlarged cross-sectional view illustrating the vehicle's internal display device. [ Fig. 12] Fig. Figure 12 is a schematic representation of a modification of the vehicle's internal display device. [ Fig. 13] Fig. Figure 13 is a schematic representation illustrating the rib, which has a trapezoidal cross-sectional shape. DESCRIPTION OF EXECUTION FORMS

[0018] A range of numbers represented using "to" includes numerical values ​​that are described before and after "to" as a lower limit and an upper limit.

[0019] One embodiment of the present invention is described below with reference to the drawings. However, the present invention is not limited to the following embodiment. Various modifications and substitutions can be made to the following embodiment without departing from the scope of protection of the present invention.

[0020] An in-vehicle display device according to the embodiment of the present invention is an in-vehicle display device comprising n layers from a cover glass to a housing base element and including at least one display field located midway through its n layers. An element of each layer comprises only a plate-shaped element or comprises the plate-shaped element and a rib. The housing base element is attached to an inner section of a vehicle at at least two mounting points. If a virtual plane passing through an intermediate point between the two mounting points and perpendicular to a line connecting the two mounting points is defined as a virtual plane R, and a length of a section line between a principal surface of the cover glass and the virtual plane R is defined as a distance Z cgIf a length on an intersection line between a main surface of the display field and the virtual plane R from a top end to a point corresponding to the intermediate point is defined as a distance Z, then the ratio Z / Z is cg of the distance Z to the distance Z cg 0.6 or less. The n layers from the cover glass to the housing base element on a virtual line L, which extends 5 mm along a side to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfy the following equation (1).

[0021] Alternatively, an in-vehicle display device according to the embodiment of the present invention is an in-vehicle display device comprising n layers from a cover glass to a housing base element and including at least one display field located midway through its n layers. An element of each layer comprises only a plate-shaped element or comprises the plate-shaped element and a rib. The housing base element is attached to an inner section of a vehicle at a mounting point. If a virtual plane passing through the mounting point and comprising a thickness direction and a vertical direction of the cover glass at the mounting point is defined as a virtual plane R, then a length of a section line between a major surface of the cover glass and the virtual plane R is defined as a distance Z. cgIf a length on an intersection line between a main surface of the display field and the virtual plane R from an upper end to a point corresponding to the mounting point is defined as a distance Z, then the ratio Z / Z is cg of the distance Z to the distance Z cg 0.6 or less. The n layers from the cover glass to the housing base element on a virtual line L, which extends 5 mm along a side from the top of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfy the following equation (1).

[0022] Fig. Figure 1 is a cross-sectional view illustrating an in-vehicle display device 1. Hereinafter, the “in-vehicle display device” can simply be referred to as a “display device”.

[0023] Fig. 2 is a cross-sectional view along a line AA in Fig. 1. In Fig. Figure 2 omits the illustration of rib 7 (rib 75, rib 76 and rib 77) in a lateral direction, which is described below.

[0024] As described below, the vehicle-internal display device 1 is a vehicle-internal display device in or on the dashboard.

[0025] The vehicle-internal display device 1 is, for example, a car navigation device and can be another display device mounted in a vehicle, such as a display audio device. <grundzusammensetzung>

[0026] The vehicle-internal display device 1 comprises a display field 3, such as a liquid crystal field, and a cover glass 2.

[0027] The display field 3 is attached to the cover glass 2 with an adhesive layer (not illustrated).

[0028] The adhesive layer is, for example, an optically clear adhesive (OCA) film or an OCA tape, and its thickness is, for example, 5 to 400 µm and preferably 50 to 200 µm.

[0029] The vehicle-integrated display device 1 further comprises a housing base element 5 and a housing side wall 8, which together form a housing for the vehicle-integrated display device 1. A backlighting unit 4, which is required if the display field 3 is a liquid crystal field, is arranged on the housing base element 5. Hereinafter, the “housing base element” may simply be referred to as a “base element”.

[0030] As previously described, the vehicle-integrated display device according to the embodiment of the present invention has a configuration in which the n layers are stacked from the cover glass to the housing base element. The vehicle-integrated display device according to the embodiment of the present invention has the n layers from the cover glass to the housing base element and includes at least the display field located midway through its n layers. In other words, the vehicle-integrated display device according to the embodiment of the present invention has a stacked structure of the n layers, comprising the housing base element, the display field, and the cover glass in that order, with the first layer being the cover glass and the nth layer being the housing base element.

[0031] n is an integer equal to 3 or greater, and preferably 4 or greater. On the other hand, n is preferably 15 or less, and more preferably 12 or less.

[0032] For example, in the case of the vehicle's internal display device 1, which is located in Fig. 1 and Fig. Figure 2 illustrates four layers, i.e. the cover glass 2 (first layer), the display panel 3 (second layer), the backlight unit 4 (third layer) and the housing base element 5 (fourth layer) stacked in this order.

[0033] In fact, the adhesive layer is present between the cover glass 2 (first layer) and the display field 3 (second layer), and the handling of the adhesive layer is described below.

[0034] It is possible that the vehicle's internal display device 1 does not include the backlighting unit 4.

[0035] In particular, for example, the vehicle-internal display device 1 can have a configuration in which three layers, i.e. the cover glass 2 (first layer), the display field 3 (second layer) and the housing base element 5 (third layer), are stacked in this order.

[0036] In this case, an organic EL field or the like, which does not require the backlight unit 4, is selected as the display field 3.

[0037] The element of each layer in the vehicle-internal display device according to the embodiment of the present invention comprises only a plate-shaped element or comprises a plate-shaped element and a rib.

[0038] In the embodiment described below, a case in which the element comprising a plate-shaped element and ribs is limited to the housing base element is described as an example.

[0039] In the case where an element that differs from the housing base element comprises a plate-shaped element and ribs, the element can be handled in the same way as the housing base element described below.

[0040] The housing base element 5 comprises a housing base plate 6, which is a plate-shaped element. A plurality of ribs 7 are provided on a surface of the housing base plate 6, opposite the cover glass 2. The rib 7 is, for example, a square prism element. Because the housing base element 5 is formed in a shape that includes the rib 7, it is possible to reduce the weight of the vehicle's internal display device 1 compared to the case where the housing base element 5 is formed in a thick plate shape that does not have a rib 7. The rib 7 can have a curved shape instead of a straight one.

[0041] Fig. Figure 3 is a schematic representation of the housing base element 5 as viewed from one rib side 7. Fig. 3 The illustration of a subsequently described bracket 9 or the like has been omitted.

[0042] As in Fig. As illustrated in Figure 3, the plurality of ribs 7 are provided in a grid pattern on the housing base element 5 of the present embodiment. In particular, the plurality of ribs 7, which are arranged in Fig. 3 extend in an up-down direction, i.e., a rib 71, a rib 72, a rib 73, and a rib 74, the multitude of ribs 7 that are in Fig. 3 extend in a left-right direction, i.e., rib 75, rib 76, and rib 77. The shape of rib 7 is not on Fig. 3 is limited and can be any shape, for example a curved shape instead of a straight shape, or it is possible that they are not provided in a grid format.

[0043] It is possible that the housing base element 5 does not have the rib 7. In this case, the housing base element 5 only comprises the housing base plate 6.

[0044] The housing base element 5 can be integrated with the housing side wall 8. The housing base element 5 can be formed by a process such as die casting or compression molding. <Befestigen am inneren Abschnitt des Fahrzeugs>

[0045] Next, with reference to Fig. 4 in addition to Fig. 1, Fig. 2 to Fig. 3 describes the attachment of the vehicle's internal display device 1 (housing base element 5) to an inner section 10 of a vehicle. Hereinafter, the "inner section of the vehicle" can simply be referred to as an "inner section". The inner section 10 is, for example, part of the vehicle's dashboard.

[0046] Fig. Figure 4 is a schematic representation of an arrangement state of the brackets 9 and is a view of the vehicle-internal display device 1 (housing base element 5) from one side of an inner section 10 (in Fig. 4 not illustrated) considered. Fig. In section 4, the illustration of rib 7 or similar is omitted.

[0047] The housing base element 5 is attached to the inner section 10 of the vehicle at attachment points (attachment points P1 to P4) on one side of a rear surface (the side opposite the cover glass 2). That is to say, in Fig. The four attachment points P are formed on a main surface of the base element 5 on one side of a Z-direction (which can subsequently be referred to simply as the "main surface of the base element 5"). The number of attachment points P in the example is Fig. 4 four and can be any one. The attachment points P (the attachment points P1 to P4) are sections of the base element 5 that serve as interfaces to be attached to the vehicle (in the present embodiment, the inner section 10) and are sections to which the brackets 9 described below can be attached in the present embodiment. The X-direction, Y-direction, and Z-direction can be defined in the following description of the attachment points P as follows. That is, as in Fig. 1, Fig. 2, Fig. 3 to Fig. As illustrated in Figure 4, a direction that represents the thickness of the display device 1 from a display surface to a rear surface is defined as the Z-direction. In the state where the display device 1 is mounted on the vehicle, a direction (in the example of Fig. 1. The right direction) is defined as orthogonal to the Z-direction and directed along a horizontal plane as the X-direction. Among directions orthogonal to both the Z-direction and the X-direction, an upward direction in a vertical plane is defined as the Y-direction. Regarding the Z-direction, the X-direction, and the Y-direction, "direction" is used as a concept that implies an orientation. That is, the term "Z-direction" refers to the previously defined orientation, and the term "direction opposite to the Z-direction" refers to an orientation opposite to the previously defined orientation.

[0048] The base element 5 is attached to the supports 9 in a state where the main surface on the Z-direction side is in contact with the fasteners (here, the supports 9). If a region of the main surface of the base element 5 that is in contact with the fasteners is referred to as a contact region, the attachment points P can be called points on the contact region. The attachment points P can be any position on the contact region. For example, in Fig. 4. The attachment point P (the attachment points P1 to P4) is exemplified as a midpoint position in the X-direction of the side located on the Y-direction from each contact region. Alternatively, the attachment point P (the attachment points P1 to P4) can, for example, be a midpoint position in the X-direction of the side located on the side opposite to the Y-direction from the contact region. One can say that one attachment point P is formed for each contact region. That is, one can say that if there are multiple attachment points P, there are multiple contact regions at separate positions, and one attachment point is formed in each contact region. One can say that if there is an attachment point P, there is also a contact region.

[0049] For example, in the case where the vehicle-internal display device 1 (the housing base element 5) is attached to the brackets 9, a position can be chosen which has a center point on one side of an end of a convex surface 9a of the bracket 9 in the main surface of the base element 5 (that is, a center point in the X-direction of the side opposite to the Y-direction of the contact region in the Fig. 1, Fig. 2, Fig. 3 to Fig. (4 illustrated embodiment) overlaps when the fastening point P is set. Additionally, if the base element 5 is attached to the supports 9 with fastening elements such as bolts, the fastening point P can be a section of the main surface of the base element 5 in which a hole (for example, a bolt hole) into which the fastening element is inserted is open. Alternatively, if the base element 5 is attached to the support 9 with a plurality of fastening elements per contact region, the fastening point P can be a central position between sections in which holes (for example, bolt holes) into which the fastening elements are inserted are open.For example, if the base element 5 is attached to the supports 9 with an adhesive or the like, the attachment point P can be a point on the contact region where the adhesive is applied to the main surface of the base element 5. Alternatively, the base element 5 can be attached to the vehicle by forming a projection on its main surface and inserting the projection into a recess formed in the vehicle (in the present embodiment, the inner section 10). In this case, the projection of the base element 5 can be considered the support 9 without the need for a separate support 9. In this case, a surface on the Z-direction side of the projection of the base element 5 is a contact region, and a point on the contact region can be the attachment point P.Alternatively, for example, the base element 5 can be attached to the vehicle by forming a recess in the main surface of the base element 5 and inserting a projection formed on the vehicle (in the present embodiment, the inner section 10) into the recess in the main surface of the base element 5. In this case, the projection of the vehicle can be considered the support 9 without the need for a separate support 9. In this case, a surface on the Z-direction side of the recess of the base element 5 is a contact region, and a point on the contact region can be the attachment point P. The position of the attachment point P, or the like, is explained below.

[0050] In the example of Fig. 4. Mounting points P1 and P2 are arranged along a width direction of the vehicle. The same applies to mounting points P3 and P4. A line passing through mounting points P1 and P2, and a line passing through mounting points P3 and P4, are parallel to each other, and the four points form a rectangle.

[0051] As in Fig. 1, Fig. 2, Fig. 3 to Fig. As illustrated in Figure 4, the brackets 9 (brackets 91 to 94) can be attached to the mounting points (mounting points P1 to P4) as the fastening elements. In this case, the housing base element 5 is attached to the inner section 10 via the brackets 9.

[0052] Bracket 9 is an elongated, plate-shaped element and is bent into a U-shape. Bracket 9 can also be bent into an S-shape.

[0053] For example, the center of the bracket 9 is positioned in a plate width direction at the fixing point (fixing points P1 to P4). In the bracket 9, one side of the end of the convex surface 9a (the lower surface in Fig. 2), which is formed by bending it into a U-shape, in contact with the attachment point (the attachment points P1 or the attachment point P2). In the Fig. 1, Fig. 2, Fig. 3 to Fig. In the illustrated embodiment 4, a direction perpendicular to the convex surface 9a of the bracket 9 intersects perpendicularly with the width direction of the vehicle.

[0054] In the Fig. 1, Fig. 2, Fig. 3 to Fig. In the embodiment illustrated in Figure 4, the support 9 comprises the convex surface 9a, which is formed by bending it into a U-shape, a surface 9b connected to the convex surface 9a, and another surface 9c connected to the convex surface 9a. The first surface 9b and the second surface 9c are formed substantially perpendicular to the convex surface 9a. Furthermore, in the embodiment illustrated in Fig. 1, Fig. 2, Fig. 3 to Fig. In the embodiment illustrated in Figure 4, one surface 9b, which is connected to the convex surface 9a, is in contact with the housing base element 5 and the other surface 9c, which is connected to the convex surface 9a, is in contact with the inner section 10.

[0055] The bracket 9 is attached to the housing base element 5 and the inner section 10 by a fastening element, such as a screw (not illustrated).

[0056] Fig. Figure 4 illustrates an intermediate point Q between the attachment point P1 and the attachment point P2.

[0057] A distance between the intermediate point Q and the attachment point P1 or a distance between the intermediate point Q and the attachment point P2 is defined as a distance X.

[0058] With a view to optimizing the vibration characteristics (JIS D 1601 Vibration test method for automotive parts), the distance X is preferably 30 to 200 mm and more preferably 50 to 130 mm.

[0059] A distance between mounting point P1 and mounting point P3, which is in Fig. 4 is arranged in an up-down direction, or a distance between the mounting point P2 and the mounting point P4 is defined as a distance Y.

[0060] For the same reason as the distance X, the distance Y is preferably 30 to 200 mm and even more preferably 35 to 125 mm.

[0061] In the embodiment of the present invention, two mounting points are selected from above, i.e. from the side of the Y-direction, among the mounting points set on the housing base element 5, and a midpoint of these is used as the intermediate point Q.

[0062] For example, illustrate Fig. 1, Fig. 2, Fig. 3 to Fig. 4 an aspect in which the housing base element 5 is attached to the inner section 10 at four attachment points (the attachment points P1 to P4), two each on the upper and lower side.

[0063] As in Fig. 1, Fig. 2, Fig. 3 to Fig. As illustrated in Figure 4, in the case where there are multiple upper and lower attachment points, the two uppermost attachment points (attachment points P1 and P2 in Figure 4) are used. Fig. 1, Fig. 2, Fig. 3 to Fig. 4) as the attachment points to define the intermediate point Q (and the virtual plane R described below).

[0064] In the case where there are three or more attachment points on a line that have the same height, i.e., the same position in the Y direction, two attachment points that have the smallest interval between them are selected, and one of their midpoints is set as the intermediate point Q.

[0065] In the case where three or more attachment points are present at equal intervals and at the same height, the midpoint of any combination of two attachment points with the smallest interval can be set as the intermediate point Q. That is, in the case where a plurality of candidates for the intermediate point Q (and the virtual plane R and the virtual line L, which are described below) exist, any one of the candidates can satisfy the requirements of the present invention.

[0066] The housing base element 5 can be attached to the inner section 10 at three points.

[0067] For example, when explaining with reference to Fig. 4. A case is assumed in which there is no attachment point P1 and attachment point P2 and instead another attachment point P' (not in Fig. (as illustrated in Figure 4 or similar) is present on the line connecting attachment point P1 and attachment point P2. In this case, the housing base element 5 is attached to the inner section 10 at three points, namely attachment point P3, attachment point P4, and attachment point P'.

[0068] At this point, if there is no height difference between attachment point P3 and attachment point P4, a point closer to attachment point P' is selected, and the midpoint between the selected point and attachment point P' is set as the intermediate point Q. If there is no difference in distance between any attachment point and attachment point P', any attachment point is selected, and the midpoint between the selected point and attachment point P' is set as the intermediate point Q.

[0069] It is possible that the housing base element 5 is attached to the inner section 10 at only one attachment point (referred to for simplicity as a "fixing point P"). That is, it is possible that the bracket 9 is located only at the mounting point P", and the housing base element 5 can be attached to the inner section 10 using the bracket 9.

[0070] In this case, a virtual plane perpendicular to one side of the convex surface 9a of the bracket 9, which is located at the attachment point P" and is in contact with the housing base element 5, is defined as the virtual plane R described below.

[0071] The housing base element 5 can be attached to the inner section 10, for example, by deforming a portion of the housing base element 5 without using the support 9. Alternatively, a portion of the inner section 10 can be deformed and attached to the housing base element 5. In this case, each attachment point can be defined as the center of each attachment section.

[0072] As long as the previously described fastening condition is met, a portion of the housing side wall 8 can be deformed and attached to the inner section 10. Alternatively, a portion of the inner section 10 can be deformed and attached to the housing side wall 8. <Verhältnis Z / Z cg >

[0073] Fig. 1, Fig. 2, Fig. 3 to Fig. Figure 4 illustrates the virtual plane R passing through the intermediate point Q and perpendicular to the line connecting attachment point P1 and attachment point P2 (two attachment points P used to define the intermediate point Q). As previously described, in the case where the housing bottom element 5 is attached to the inner section 10 at only one attachment point P" using the bracket 9, the virtual plane R can also be defined as a virtual plane perpendicular to the side of the convex surface 9a of the bracket 9 that is in contact with the housing bottom element 5, and a virtual plane passing through the attachment point P" that includes a thickness direction and a vertical direction of the cover glass 2 at the attachment point P". In other words, in a mode where the intermediate point Q is provided, the virtual plane R can be defined as a YZ plane that includes the intermediate point Q.Furthermore, in the case where the housing bottom element 5 is attached to the inner section 10 at only the one attachment point P", the virtual plane R can be defined as a YZ plane that includes the attachment point P".

[0074] This refers to Fig. 2. The length of a section line between a main surface of the cover glass 2 and the virtual plane R is defined as a distance Z. cg defined. Furthermore, a length on a line of intersection between a main surface of the display field 3 and the virtual plane R from an upper end (end on the Y-direction side) to a point corresponding to the intermediate point Q is defined as a distance Z. In the case where the housing base element 5 is attached to the inner section 10 at only one attachment point P", the "point corresponding to the intermediate point Q" is read as a "point corresponding to the attachment point P". That is, a length on the line of intersection between the main surface of the display field 3 and the virtual plane R from the upper end (end on the Y-direction side) to a point corresponding to the attachment point P" is defined as the distance Z.Regarding the distance Z, a direction from the center of display field 3 towards the outside of display field 3 is defined as a positive direction, and a direction from the outside of display field 3 towards the center of display field 3 is defined as a negative direction.

[0075] The “point corresponding to intermediate point Q” or the “point corresponding to mounting point P”” is a point located on the main surface of the display field 3 by moving the intermediate point Q or the mounting point P” in a thickness direction (up-down direction). Fig. 1) is positioned on the vehicle's internal display device 1.

[0076] In the present application, the case is where the ratio Z / Z cg of the distance Z to the distance Z cg A value exceeding 0.6 is defined as a stationary display device. On the other hand, the case where the ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less than defined by the display device in or on the dashboard.

[0077] The vehicle's internal display device 1 shows the ratio Z / Z cg of the distance Z to the distance Z cg of 0.6 or less and is a display device in or on the dashboard (hereinafter also referred to simply as the "dashboard display device"). <Gleichungen (1) bis (4)>

[0078] In order for the cover glass to exhibit good impact resistance, as previously described, the vehicle's internal display device 1 in the dashboard may not be sufficient, so that only the "equation (I)" described in patent literature 1 is fulfilled. Furthermore, it is necessary to consider a shape of the housing base element 5 which can have the rib 7.

[0079] This illustrates Fig. 2. The virtual line L extends 5 mm from the upper end of the intersection line between the main surface of the display field 3 and the virtual plane R in the thickness direction of the vehicle's internal display device 1, passing through one side towards the lower end. The virtual line L is perpendicular to a surface (main surface) of the cover glass 2.

[0080] A point on the main surface of the cover glass 2, through which the virtual line L passes, is defined as an impact point P. The head impact test described below is a test in which an impactor collides with the impact point P, thus evaluating the impact resistance or similar properties of the cover glass 2.

[0081] The present inventors have found that the cover glass has excellent impact resistance if an n-layer stacked body from the cover glass to the housing base element satisfies the following equation (1) on the virtual line L. [Math. 1] S>(10.021×t12+0.068−t12)×E1

[0082] In equation (1) the following applies: E1: Modulus of elasticity of the cover glass (unit: GPa), t1: Thickness of the cover glass (unit: mm), and S is represented by the following equation (2).

[0083] The S-value obtained from the following equation (2) can be said to indicate the stiffness of the stacked body formed from each element (each layer) along the virtual line L. The point of impact P is a position where the impact resistance tends to be weak in the vehicle's internal display device 1. If the stiffness of the stacked body along the virtual line L passing through the point of impact P is within the preceding range, the deformation of the cover glass 2 is suppressed, and the stress generated by an impact does not exceed the glass breaking stress. Thus, the impact resistance of the cover glass 2 is excellent. [Math. 2] S=E2⋅t22+⋯+En⋅tn2

[0084] In equation (2) the following applies: E2: Elastic modulus of the second layer (unit: GPa), t2: Thickness of the second layer (unit: mm), and E n : Elastic modulus of the nth layer (housing base element in the present embodiment) (unit: GPa), t n : Thickness of the nth layer (housing base element in the present embodiment) (unit: mm), and a thickness t k any k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3). [Math. 3] tk=3a3+w2w1h3+12a(b−a2)2+12w2w1h(h2+a−b)2

[0085] In equation (3) the following applies: a: Thickness of a plate-shaped element of the k-th layer (if k=n, housing base plate of the housing base element in the present embodiment) (unit: mm), w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer (if k=n, on the housing base plate of the housing base element in the present embodiment) through which the virtual line L passes (unit: mm), w1: Distance between rib Rb1 and rib Rb2 (unit: mm), and h: Thickness of rib Rb1 and rib Rb2 (unit: mm).

[0086] As previously described, the present embodiment illustrates an exemplary case in which the element comprising the plate-shaped element and the rib is restricted to the housing base element. Therefore, for example, if k = n, that is, if the plate-shaped element and the rib are described on the housing base element, as in Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. Figure 9 illustrates that rib Rb1 is the rib 7 of the bottom element 5 that is closest to point p on a major surface 6B (the major surface on the side where rib 7 is provided) of the housing bottom plate 6, through which the virtual line L passes. Rib Rb2 is the rib 7 located on a line connecting point p on the housing bottom plate 6, through which the virtual line L passes, and rib Rb1, and is closest to rib Rb1. In other words, rib Rb2 is a rib located in the extension direction of a line passing through point p on the housing bottom plate 6, through which the virtual line L passes, and perpendicular to a centerline of rib Rb1.

[0087] Furthermore, the width of rib Rb1 denotes the width of rib Rb1 as viewed from one of its extension directions. The distance between rib Rb1 and rib Rb2 also denotes the distance between a central axis of rib Rb1 and a central axis of rib Rb2 as viewed from the extension direction of rib Rb1. Additionally, the distance between rib Rb1 and rib Rb2 can be defined as the distance between rib Rb1 (rib 72) and rib Rb2 (rib 73) (distance between their centerlines) on a perpendicular line of rib Rb1 (rib 72) passing through point p. Furthermore, if rib Rb1 and rib Rb2 have different thicknesses in the Z-direction, h can be an average value of the thicknesses of rib Rb1 and rib Rb2 in the Z-direction.

[0088] Equation (3) represents b from the following equation (4). [Math. 4] b=0.5w1⋅a2+0.5w2⋅h2+w2⋅a⋅hw1⋅a+w2⋅h

[0089] Since it is possible that the element of each layer comprising the case base element has no rib, h is a number that includes 0, that is, a number equal to 0 or greater.

[0090] In the case where the element of the k-th layer has no rib, h = 0 and thus the thickness t is k , t k = a calculated based on equations (3) and (4).

[0091] That is, in the present embodiment, the first layer (only the cover glass, which is the plate-shaped element) and the second layer (only the display field, which is the plate-shaped element) have no rib, and thus their thicknesses are the thicknesses of the cover glass itself and the display field itself, which are the plate-shaped elements.

[0092] Alternatively, for example in the case where the first layer and / or the second layer has a rib, the corresponding thicknesses t1 and / or t2 are calculated based on equations (3) and (4).

[0093] Fig. Figure 5 is a cross-sectional view illustrating the housing base element 5, and is also an enlarged view of Fig. 1.

[0094] Fig. Figure 6 is a top view, schematically showing ribs 7 (ribs 72 and 73) in Fig. Figure 5 illustrates this, and is also a view of the housing base plate 6 (in Fig. 6 not illustrated), viewed from the side of rib 7.

[0095] Fig. 5 and Fig. Figure 6 illustrates a, h, w1, w2 and point p (a and h are only in Fig. 5 illustrated). Point p is a point on the case base plate 6 that corresponds to the point of impact P of the cover glass 2, and point p and point of impact P are located on the virtual line L.

[0096] In Fig. 5 is the b a distance from the surface (surface on one side of the cover glass 2) of the housing base plate 6 to a center G (center in Fig. 5, which is the cross-sectional view of the housing base element 5).

[0097] In Fig. 5 and Fig. Since ribs 72 and 73 are both equidistant from point p, rib Rb1 can be either rib 72 or rib 73. Fig. 5 and Fig. For the sake of simplicity, rib 72 will be referred to as rib Rb1.

[0098] Out of Fig. 5 and Fig. Figure 6 shows that w2 is the width of rib Rb1 closest to point p. Furthermore, it shows that w1 is the distance between rib Rb1 and rib Rb2 (distance between the centerlines of rib Rb1 and rib Rb2).

[0099] In equations (3) and (4) the thickness (t) n ) of the housing base element, which is the nth layer (thickness t) k of the k-th layer), such that the area moment of inertia is the same as that of the housing bottom element, which has no rib.

[0100] Fig. Figure 7 is a schematic representation illustrating ribs 7 (ribs 72 and 73) in the case where the position of point p differs from that in Fig. 6 distinguishes.

[0101] In Fig. In 7, point p (the point corresponding to point of impact P) is located outside (on the left side) of rib 72 instead of between ribs 72 and 73. Fig. 7 is rib 72, which is closest to point p, rib Rb1, and rib 73, which is on the line connecting point p and rib Rb1, is rib Rb2.

[0102] The width w2 of rib Rb1 and the distance w1 between rib Rb1 and rib Rb2 are preserved. Furthermore, a distance w3 between point p and rib Rb1 (a distance from point p to the centerline of rib Rb1) is also preserved.

[0103] In the case where the distance w1 is equal to or greater than the distance w3 (w1 ≥ w3), equations (3) and (4) are calculated using values ​​of w1 and w2 such that a value of t n (t k ) will be received.

[0104] In the case where the distance w3 is greater than the distance w1 (w3 > w1), equations (3) and (4) are calculated assuming that there is no rib 7, without applying the values ​​of w1 and w2.

[0105] Fig. Figure 8 is a schematic representation illustrating the ribs 7 (ribs 75 and 76) in the lateral direction in addition to the ribs 7 (ribs 72 and 73) in a longitudinal direction.

[0106] In Fig. Rib 8 is Rb1, which is closest to point p, and rib 75 in the lateral direction. Rib Rb2, which lies on the line connecting point p and rib Rb1, is rib 76, parallel to rib 75.

[0107] As previously described, even in the case where the multitude of ribs is 7 (see for example Fig. 3) If they are present, it is possible to consider only the rib Rb1 that is closest to point p (and its corresponding rib Rb2).

[0108] In the case where there are a large number of ribs Rb1 that are the same distance from point p, a relationship between the distance w1 and the distance w3 is investigated for all ribs Rb1.

[0109] If in any of the ribs Rb1 the distance w1 is equal to or greater than the distance w3 (w1 ≥ w3), equations (3) and (4) are calculated using the values ​​of w1 and w2 relating to rib Rb1, such that the value of t n (t k ) will be received.

[0110] Fig. Figure 9 is a schematic representation illustrating a state in which the arranged ribs 7 are not parallel to each other. That is, in Fig. 9. Ribs 72 and 73 are not parallel to each other in the longitudinal direction, and ribs 75 and 76 are not parallel to each other in the lateral direction.

[0111] In Fig. 9 is rib Rb1, which is closest to point p, rib 73. Rib Rb2, which is located on the line connecting point p and rib Rb1 (rib 73), is rib 75 instead of rib 72.

[0112] The width w2 of rib Rb1 (of rib 73) and the distance (distance between center lines) w1 between rib Rb1 (of rib 73) and rib Rb2 (of rib 75) on a perpendicular line of rib Rb1 (of rib 73) passing through point p are obtained.

[0113] As previously described, it is possible that a shape obtained by crossing the multitude of ribs 7 is not a square (rectangular shape) with four right-angled corners, and may be a quadrilateral with a shape other than a rectangular one, or another polygon.

[0114] Even in this case, the values ​​of w1 and w2, which are required to calculate equations (3) and (4), can be determined according to the definition described above.

[0115] For example, the cross-sectional shape of rib 7 is rectangular or trapezoidal.

[0116] Fig. Figure 13 is a schematic representation illustrating rib 7, which has a trapezoidal cross-sectional shape. As in Fig. As illustrated in Figure 13, values ​​of w2 and w3 are measured at a height of h / 2 from the surface (surface on one side where the rib 7 is provided) of the housing base plate 6 of the housing base element 5.

[0117] The following [examples] demonstrate that the impact resistance of the cover glass is excellent when equation (1) is satisfied.

[0118] That is, the [examples] show that in the case where equation (1) is not satisfied (comparative examples), a stress generated in the cover glass is higher than a fracture threshold, while in the case where equation (1) is satisfied (examples), the stress generated in the cover glass is lower than the fracture threshold.

[0119] Furthermore, if the following equation (4A) is satisfied, the stress generated in the cover glass is further reduced, and thus the fracture frequency can be further reduced, which is more preferred. [Math. 5] S≥(10.021×t12+0.068−t12)×E1+300

[0120] As previously described, the vehicle's internal instrument panel display tends to exhibit low impact absorption. In particular, the vehicle's internal instrument panel display display may exhibit a deceleration of the impactor during a head impact test of 50G or more.

[0121] The head impact test is a test in which the striking object impacts the point of impact P (see Fig. 2) collides on the main surface of the cover glass 2 through which the virtual line L passes, so that an energy at the time of collision is 152 J (see the [examples] described below).

[0122] With regard to the safety of an occupant, the time during which the deceleration of the impactor exceeds 80 G during the head impact test (hereinafter referred to for simplicity as "time during which the deceleration exceeds 80 G") must be less than 3 milliseconds (ms).

[0123] From this perspective, it is preferred in the vehicle-internal display device that the first layer up to the nth layer on the virtual line L further satisfy the following equation (5). S≤−588.8t1+2660

[0124] The following [examples] show that in the case where equation (5) is satisfied, the time during which the deceleration exceeds 80 G is less than 3 milliseconds.

[0125] As described above, at least one layer of the elements, from the cover glass (first layer) to the housing base element (nth layer), can indeed be an adhesive layer. For example, in the four-layer structure described above, the adhesive layer can be located between the cover glass (first layer) and the display panel (second layer).

[0126] Here, taking into account the modulus of elasticity (E) Haftschicht ) and the thickness (t Haftschicht ) of the adhesive layer, equation (2) for obtaining the S-value is expressed as follows. S=Eadhesive layer⋅tadhesive layer2+E2⋅t22+E3⋅t32+E4⋅t42

[0127] The modulus of elasticity (E Haftschicht The thickness (t) of the adhesive layer is, however, much lower than that of the other layers. Haftschicht The thickness of the adhesive layer is, for example, 5 to 400 µm.

[0128] Therefore, a value of "E" Haftschicht · t Haftschicht 2 " in equation (2) compared to the other values ​​of "E2 · t2 2 " to "E4 · t4 2 "Negligibly small".

[0129] Therefore, even if the adhesive layer is present from the first layer to the nth layer, equation (2) can be considered as if no adhesive layer is present. In other words, the value of “E Haftschicht · t Haftschicht 2 " can be considered as 0 (zero).

[0130] For the same reason, other thin-film and resin layers contained within the cover glass (first layer) up to the housing base element (nth layer) can be considered absent when considering equation (2). For example, a thin-film layer, such as an anti-reflective (AR) or anti-fingerprint (AFP) coating, is formed on a surface of the cover glass. Furthermore, the display panel includes a thin-film layer, such as a TFT (thin-film transistor), and a transparent conductor. These thin-film layers are, however, extremely thinner than, for example, the cover glass itself or a glass substrate (such as soda-lime glass) that forms a display panel.

[0131] Furthermore, a backlighting unit or the like may have a resin layer, but the elastic modulus of the resin layer is extremely low.

[0132] Therefore, assuming that the resin layers are an "m-th layer", a value of "E" can be obtained. m · t m 2 " are considered as 0 (zero).

[0133] Examples of an embodiment of an in-vehicle display device with a thin-film layer include an embodiment comprising a cover glass, an OCA, a polarizing plate, a color filter, a liquid crystal, a TFT substrate, a polarizing plate, a brightness enhancement film, a lens film, a diffusion plate, a light guide plate, a reflective film, a housing for the backlight unit, a printed circuit board, a housing base element, and a housing resin cover.

[0134] The element that forms each layer is described in detail below.

[0135] The material or the like of each element is not particularly limited as long as the layers from the cover glass to the housing base element on the virtual line L of the vehicle-internal display device satisfy the equation (1) described above.

[0136] Furthermore, any material can be a composite material, which is formed by combining a variety of materials. <deckglas>

[0137] The cover glass is preferably a reinforced glass, such as chemically reinforced glass.

[0138] The thickness (DOL) of a compressive stress layer in the reinforced glass is, for example, 10 µm or more, preferably 15 µm or more, more preferably 25 µm or more, and even more preferably 30 µm or more. The thickness (DOL) of the compressive stress layer is, for example, 180 µm or less, and preferably 50 µm or less.

[0139] The surface compressive stress (CS) in the compressive stress layer is preferably 500 MPa or more, more preferably 650 MPa or more, and even more preferably 750 MPa or more. An upper limit for the surface compressive stress (CS) is not particularly restricted, and CS is, for example, preferably 1200 MPa or less.

[0140] Examples of a process for subjecting glass to a chemical strengthening treatment to obtain chemically strengthened glass typically include a process involving immersion of the glass in a KNO3 salt melt to perform an ion exchange treatment, followed by cooling to approximately room temperature. The treatment conditions, such as the temperature of the KNO3 salt melt and the immersion time, can be adjusted so that the surface compressive stress and the thickness of the compressive stress layer meet the desired values.

[0141] Examples of glass types include soda-lime glass and aluminosilicate glass (glass based on SiO2-Al2O3-Na2O). Of these, aluminosilicate glass is preferred due to its strength.

[0142] Examples of the glass material include a glass material containing 50% to 80% SiO2, 1% to 20% Al2O3, 6% to 20% Na2O, 0% to 11% K2O, 0% to 15% MgO, 0% to 6% CaO and 0% to 5% ZrO2 in mol%, based on oxides.

[0143] A chemically strengthening glass based on aluminosilicate glass (for example, “Dragontrail (registered trademark)”, manufactured by AGC Inc.) is also used appropriately.

[0144] The elastic modulus (E1) of the cover glass is preferably 60 GPa or more and more preferably 70 GPa or more.

[0145] On the other hand, the elastic modulus (E1) of the cover glass is preferably 90 GPa or less, more preferably 80 GPa or less or, even more preferably, 75 GPa or less.

[0146] The elastic modulus of each element comprising the cover glass is obtained by means of a tensile test (JIS K7161, JIS K7113) (the same applies below).

[0147] The thickness (t1) of the cover glass is preferably 0.5 mm or more, more preferably 0.7 mm or more and more preferably 1.1 mm or more.

[0148] On the other hand, the thickness (t1) of the cover glass is preferably 2.5 mm or less, more preferably 2.0 mm or less and more preferably 1.3 mm or less.

[0149] The thickness of each element encompassing the cover glass is a length in the up-down direction or a length in the Z-direction in Fig. 1 (the same applies below).

[0150] For example, the cover glass has a rectangular shape when viewed from the direction in which the main surface is viewed.

[0151] For example, in the case where the cover glass has a rectangular shape, a size of the cover glass can be a size in which a length in a longitudinal direction is 100 to 800 mm and a length in a lateral direction is 40 to 300 mm.

[0152] This applies if the mass of the vehicle's internal display device per unit area of ​​the cover glass is defined as M (unit: g / cm²). 2 ) is defined, the mass M and the thickness t1 of the cover glass are preferably defined by the following equations (6) and (7).

[0153] In the case where a fastening element, such as a bracket, is used to fasten the housing base element of the vehicle's internal display device to an inner section of a vehicle, the mass M includes a mass of the fastening element. M≥−0.10t14+0.38t13−0.62t12+0.42t1+1.75 M≤0.03t1+2.40

[0154] In the case where the mass M satisfies equation (6), it is possible to obtain an in-vehicle display device in which deformation of the cover glass due to collision is suppressed and it is less likely that the cover glass will break.

[0155] In the case where the mass M satisfies equation (7), it is less likely that the deceleration will increase at the time of the collision, and the time during which the deceleration is high can be shortened, and thus it is possible to obtain an in-vehicle display device where damage to a collided object, such as a human body, is less likely.

[0156] In equation (6), since the value of t1 is equal to 0.7 or more, a value of the mass M decreases. Therefore, with a view to reducing the weight of the vehicle's internal display device, the thickness (t1) of the cover glass is preferably 0.7 mm or more. <anzeigefeld>

[0157] The display field can be, for example, a liquid crystal field, an organic EL field, a plasma display, or an E-Ink field, and may include a touch-sensitive field or similar. Generally, among the display fields, the glass substrate is the thickest and has the most significant stiffness. Therefore, the elastic modulus of the glass substrate can be considered the elastic modulus of the display field.

[0158] The elastic modulus (E2) of the display field is preferably 60 GPa or more and more preferably 70 GPa or more.

[0159] On the other hand, the elastic modulus (E2) of the display field is preferably 90 GPa or less and more preferably 75 GPa or less.

[0160] The thickness (t2) of the display field is preferably 1.0 mm or more and more preferably 1.1 mm or more.

[0161] On the other hand, the thickness (t2) of the display field is preferably 2.0 mm or less and more preferably 1.3 mm or less.

[0162] Fig. Figure 10 is a schematic representation illustrating a state in which the display field 3 is attached to the cover glass 2.

[0163] In Fig. With regard to the adhesion and holding of the cover glass 2 with sufficient adhesive strength, the distance D1 is preferably 2 to 30 mm and more preferably 5 to 20 mm.

[0164] Furthermore, with regard to adhesion strength and design, the distance D2 is preferably 2 to 200 mm and more preferably 5 to 150 mm. <hintergrundbeleuchtungseinheit>

[0165] The backlight assembly generally comprises elements such as a lens film, a diffusion film, a light guide plate, a lamp, and a reflector. Among these elements, the light guide plate is usually the thickest and has the most significant impact on the overall stiffness of the backlight assembly. Therefore, the elastic modulus of the light guide plate is considered to be the elastic modulus of the backlight assembly.

[0166] The elastic modulus (E3) of the backlight unit is preferably 1 GPa or more, more preferably 2 GPa or more and more preferably 60 GPa or more.

[0167] On the other hand, the elastic modulus (E3) of the backlight unit is preferably 90 GPa or less and more preferably 85 GPa or less.

[0168] The thickness (t3) of the backlight unit is preferably 1 mm or more, more preferably 2 mm or more and more preferably 3 mm or more.

[0169] On the other hand, the thickness (t3) of the backlight unit is preferably 10 mm or less, more preferably 6 mm or less and more preferably 5 mm or less.

[0170] Fig. Figure 11 is an enlarged cross-sectional view illustrating the vehicle's internal display device 1.

[0171] As in Fig. As illustrated in Figure 11, the housing side wall 8 can be positioned facing an end surface of the display field 3 with a gap between them. Here, the housing side wall 8 can be part of the backlight unit 4.

[0172] The distance d1 of the gap between the end surface of the display field 3 and the housing side wall 8 (distance d1 between the end surface of the display field 3 and the housing side wall 8) is preferably 2 mm or less and more preferably 1.8 mm or less.

[0173] Accordingly, the stress applied to the cover glass 2 during the head impact test can be reduced and the impact resistance is excellent.

[0174] As in Fig. As illustrated in Figure 11, a gap is provided between one end (section within 5 mm of the end surface) of the display field 3 and an element (here, part of the backlight unit 4) closer to the housing bottom element 5 than the display field 3. The distance d2 of the gap (distance d2 between the end of the display field and the element that is closer to the housing bottom element than the display field) is preferably 1 mm or less and more preferably 0.5 mm or less. <Gehäusebodenelement>

[0175] The elastic modulus of the housing base element is, for example, preferably 1.5 GPa or more, more preferably 40 GPa or more, and even more preferably 60 GPa or more. On the other hand, the elastic modulus of the housing base element is preferably 250 GPa or less, more preferably 230 GPa or less, even more preferably 100 GPa or less, and particularly preferably 80 GPa or less.

[0176] In the case where the housing bottom element has a rib, the modulus of elasticity (E4) of the housing bottom element is preferably 1.5 GPa or more and 100 GPa or less, and more preferably 40 GPa or more and 80 GPa or less.

[0177] In the case where the housing bottom element has no rib, the modulus of elasticity (E4) of the housing bottom element is preferably 40 GPa or more and 250 GPa or less, and more preferably 60 GPa or more and 230 GPa or less.

[0178] For example, a preferred material for the base of the housing is a metal (a single substance) or an alloy containing a metallic element, such as aluminum or magnesium. Alternatively, the base material can be a resin or a stacked body consisting of a resin layer and a metal layer.

[0179] In Fig. 5 refers to a shape or the like of the housing base element.

[0180] The “a” in Fig. 5, that is, the thickness of the housing base plate 6, is preferably 0.5 mm or more and more preferably 1 mm or more with regard to productivity.

[0181] On the other hand, the “a” in Fig. 5 With regard to weight reduction, preferably 6 mm or less and more preferably 5 mm or less.

[0182] The "h" in Fig. 5, that is, the thickness of rib 7, can be 0 mm and, with a view to obtaining a stiffness-increasing effect of rib 7, is preferably 1 mm or more and more preferably 2 mm or more.

[0183] On the other hand, the “h” in Fig. 5 with a view to simplifying the manufacture of the housing base element 5 and to preventing excessive enlargement of the size of the housing base element 5, preferably 20 mm or less and more preferably 10 mm or less.

[0184] The w1 in Fig. With a view to simplifying the manufacture of the housing base element 5, the dimension 5 is preferably 1 mm or more and more preferably 2 mm or more.

[0185] On the other hand, w1 is in Fig. 5 with a view to preventing the generation of stress in the cover glass 2 during the head impact test, preferably 40 mm or less and more preferably 30 mm or less.

[0186] The w2 in Fig. With a view to simplifying the manufacture of the housing base element 5 and to obtaining a stiffness-enhancing effect of the rib 7, the dimension of 5 is preferably 1 mm or more and more preferably 3 mm or more.

[0187] On the other hand, w2 is in Fig. 5 with a view to obtaining a weight reduction effect of the vehicle-internal display device 1, preferably 20 mm or less and more preferably 15 mm or less. <Variation>

[0188] Although Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. 9 (especially Fig. 1, Fig. 2 and Fig. 10) Illustrating the vehicle's internal display device, which includes a display field, the present invention is not limited thereto and, as in Fig. As illustrated in Figure 12, a large number of display fields can be present. In the case where a large number of display fields are present, values ​​can be calculated for each display field based on equations (1) to (4).

[0189] Fig. Figure 12 is a schematic representation illustrating a modification of the vehicle's internal display device and shows only a cover glass 2, the display fields 3, and the mountings 9. Fig. 12 two display fields 3 are attached to a cover glass 2 and a housing base element 5 (in Fig. 12 not illustrated), is at an inner section 10 (in Fig. 12 (not illustrated) attached using the brackets 9.

[0190] Also in Fig. In section 12, two attachment points, P1 and P2, are set. Therefore, after the virtual plane R, the ratio Z / Z can be determined. cg , the virtual line L and the like have been determined, the values ​​are calculated based on equations (1) to (4).

[0191] In Fig. 12. The brackets 9 are arranged outside the display fields 3. As in Fig. As illustrated in Figure 12, in the case where there are no two attachment points on a surface of the housing base element 5 facing the display field 3, the attachment points adjacent to the outer perimeter of the display field 3 are considered.

[0192] For example, for display field 3 (display field 3a) on the left side in Fig. Twelve four points (the mounting points P1 to P4) located outside the display field 3 are considered as mounting points. Among them, a midpoint between mounting point P1 and mounting point P2, the two mounting points from the top, is defined as the intermediate point Q. A plane passing through intermediate point Q and perpendicular to the line connecting mounting point P1 and mounting point P2 is defined as the virtual plane R.

[0193] On the other hand, for display field 3 (display field 3b) on the right side in Fig. 12 Three points (the mounting point P2, the mounting point P4 and the mounting point P5) that exist outside the display field 3 are considered as mounting points. Among them, a midpoint between the mounting point P2 and the mounting point P5 is defined as the intermediate point Q.

[0194] In the case where the attachment points are located outside the display field 3, the intermediate point Q may also be located outside the display field 3, depending on a position relationship.

[0195] At this point, the distance Z (length on the intersection line between the main surface of display field 3 and the virtual plane R from the top end to the point corresponding to the intermediate point Q) is a negative value and the ratio Z / Z cg is 0.6 or less, and therefore it can be determined that the vehicle's internal display device is a display device in the dashboard.

[0196] The shapes of the cover glass 2 and the display field 3 are not limited to a rectangular shape (see Fig. 1, Fig. 2 and Fig. 10) and can be a quadrilateral that differs from a rectangular shape, or other polygons, as in Fig. Figure 12 illustrates this. The cover glass 2 and the display field 3 can also have other shapes, such as a circular shape.

[0197] Furthermore, the cover glass 2 and the display field 3 are not limited to flat elements and can be curved plate elements. EXAMPLES

[0198] The embodiment of the present invention is described in detail below with reference to examples. However, the present invention is not limited to the following examples.

[0199] Examples Nos. 1 to 18 and 26 to 28 are examples, and examples Nos. 19 to 25 are comparative examples.

[0200] In the examples and comparative examples, a head impact test was performed by creating a simulation model of a display device 1 based on Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 and running a simulation by applying a blow to the simulation model. As in Fig. As illustrated in Figure 1, the model of the display device 1 comprised a cover glass 2 (first layer), a display panel 3 (second layer), a backlight unit 4 (third layer) and a housing bottom element 5 (fourth layer).

[0201] A model of the cover glass simulated a rectangular chemically strengthened glass obtained by subjecting a chemical strengthening glass based on aluminosilicate glass (“Dragontrail”, manufactured by AGC Inc.) to a chemical strengthening treatment, and the DOL was 35 µm and the CS was 750 MPa.

[0202] The cover glass measured 250 mm in a longitudinal direction and 150 mm in a lateral direction.

[0203] The elastic modulus (E1) and the thickness (t1) of the cover glass are described below.

[0204] A model of the display field simulated a configuration in which polarization plates (material: triacetylcellulose) were attached to both surfaces of a soda-lime glass, and their thickness was 1.1 mm.

[0205] A model of the adhesive layer simulated OCA (“MHM-FWD”, manufactured by Nichieikako Co., Ltd.).

[0206] A model of the backlighting unit simulated a plate-shaped body (material: polycarbonate), and its thickness was 3 mm.

[0207] A model of the case base element and the case side panel simulated an aluminum material.

[0208] It was assumed that each section was bound using double-sided tape (“VHX1701-04”, manufactured by 3M, thickness: 0.4 mm). The base of the housing was provided with grid-like ribs (see Fig. 3).

[0209] In this simulation, the housing was attached to an inner section of a vehicle using brackets.

[0210] It was assumed that a model of the bracket used an element that had a modulus of elasticity of 206 GPa and was bent at a right angle with a length ratio of 2 : 5 : 2, thus simulating SS400 steel with a thickness of 2 mm, a width of 20 mm and a length of 50 mm.

[0211] In the head impact test described below, it was assumed that a sponge (“Memory Foam CF-45M”, manufactured by Aearo Technologies LLC) with a thickness of 50 mm was placed between the case bottom element and the inner section.

[0212] The values ​​of the ratio Z / Z cg , as well as t1, a, w1, w2, h, and X, were adjusted so that they differed for each sample of the manufactured in-vehicle display devices. The values ​​are shown in Table 1 below. Here, a, w1, w2, and h are values ​​used to obtain t4, that is, a, w1, w2, and h, relative to the housing base element. Furthermore, Table 1 below also shows the value of the mass M (mass of the in-vehicle display device per unit area of ​​the cover glass). Other values ​​were set as follows in all samples. E1: 74 GPa (elastic modulus of the cover glass) E2: 73 GPa (modulus of elasticity of soda-lime glass) E3: 2.2 GPa (modulus of elasticity of polycarbonate) E4: 70 GPa (modulus of elasticity of aluminum) t2: 1.1 mm t3: 3 mm D1: 12 mm D2: 40 mm d1: 1.5 mm d2: 0.5 mm

[0213] In each of the examples, the mass M of the vehicle's internal display device per unit area of ​​the cover glass satisfied the previously described equations (6) and (7). <Kopfaufschlagprüfung (HIT)>

[0214] A simulation was performed in which an impactor collides with the impact point P of the model, which is generated in each example under the following conditions.

[0215] A striking body (material: aluminum, diameter: 165 mm, mass: 6.8 kg), which is a hemispherical rigid body, was caused to impact point P (see Fig. 2) to collide with the cover glass. One direction in which the impactor collided with the cover glass was at an angle of 90° to the main surface of the cover glass. A maximum collision speed was set to 24.1 km / h and an energy at the moment of collision was set to 152 J. At this time, a deceleration (unit: G) of the impactor was obtained. (Evaluation results)

[0216] Analysis results of the stress generated in the cover element 2 when the impactor collided with the point of impact P were obtained by means of simulation. In the case where the maximum stress generated in the cover element 2 was equal to or less than a predetermined threshold and 12% or more below the threshold, the result was A; in the case where the maximum stress was 0% or more and less than 12% below the threshold, the result was B; in the case where the maximum stress was greater than the threshold and more than 0% and less than 12% above the threshold, the result was C; and in the case where the maximum stress was 12% or more above the threshold, the result was D.

[0217] In samples of identical design, even with the same applied stress, variations in strength can lead to the cover element (cover glass) 2 breaking in one case and not breaking in another. The frequency of breakage increases when the applied stress value is closer to the fracture threshold.

[0218] In cases A and B, the generated maximum stress is equal to or less than the threshold, and the probability of the cover glass breaking in the head impact test is lower. In cases C and D, the generated maximum stress is greater than the threshold, and it is likely that the cover glass will break in the head impact test. Furthermore, in case A, the breakage rate can be significantly reduced.

[0219] Furthermore, as shown in Table 1, the simulation also recorded analysis results of the deceleration of the impactor. [Table 1] [Table 1 (continued)] Wert derrechten Seiteder Gleichung (6) M[g / cm 2 ] Wert derrechten Seiteder Gleichung (7) Bruch Verlangsamung [G] Zeit, währendder die Verlangsamung 80 G überschreitet [ms] Nr. 1 1,85 ≤ 1,90 ≤ 2,42 B 59 0 Beispiel Nr. 2 1,83 ≤ 2,01 ≤ 2,43 B 60 0 Beispiel Nr. 3 1,80 ≤ 1,82 ≤ 2,44 B 58 0 Beispiel Nr. 4 1,55 ≤ 1,72 ≤ 2,46 B 60 0 Beispiel Nr. 5 1,85 ≤ 2,04 ≤ 2,42 B 69 0 Beispiel Nr. 6 1,85 ≤ 2,17 ≤ 2,42 B 72 0 Beispiel Nr. 7 1,85 ≤ 2,04 ≤ 2,42 B 70 0 Beispiel Nr. 8 1,85 ≤ 2,17 ≤ 2,42 B 70 0 Beispiel Nr. 9 1,83 ≤ 2,15 ≤ 2,43 B 66 0 Beispiel Nr. 10 1,85 ≤ 2,04 ≤ 2,42 B 65 0 Beispiel Nr. 11 1,83 ≤ 2,02 ≤ 2,43 B 60 0 Example Nr. 12 1,83 ≤ 2,01 ≤ 2,43 B 61 0 Example Nr. 13 1,83 ≤ 2,01 ≤ 2,43 A 86 2 Example Nr. 14 1,85 ≤ 2,17 ≤ 2,42 A 90 2,4 Example Nr. 15 1,83 ≤ 2,28 ≤ 2,43 A 94 2,8 Example Nr. 16 1,85 ≤ 2,18 ≤ 2,42 A 94 2,8 Example Nr. 17 1,83 ≤ 2,02 ≤ 2,43 A 99 2,9 Example Nr. 18 1,76 ≤ 2,41 ≤ 2,45 B 101 2,6 Example Nr. 19 1,85 > 1,63 ≤ 2,42 C 55 0 Comparative example Nr. 20 1,85 > 1,77 ≤ 2,42 C 59 0 Comparative example Nr. 21 1,83 > 1,74 ≤ 2,43 C 57 0 Comparative example Nr. 22 1,80 > 1,55 ≤ 2,44 C 58 0 Comparative example Nr. 23 1,76 > 1,61 ≤ 2,45 C 58 0 Comparative example Nr. 24 1,85 > 1,63 ≤ 2,42 C 84 0,4 Comparative example Nr. 25 1,85 > 1,77 ≤ 2,42 D 85 0,4 Comparative example Nr. 26 1,83 ≤ 2,55 > 2,43 A 104 3,2 Example Nr. 27 1,85 ≤ 2,44 > 2,42 A 103 3,2 Example Nr. 28 1,76 ≤ 2,68 > 2,45 A 109 3 Example

[0220] In examples 1 to 18 and 26 to 28, in examples 26 to 28 which did not satisfy equation (5), the time during which the deceleration exceeded 80 G was 3 ms or more, whereas in examples 1 to 18 which satisfied equation (5), the time during which the deceleration exceeded 80 G was less than 3 ms.

[0221] Each of examples Nos. 1 to 18 and 26 to 28 satisfied equation (6).

[0222] Comparing examples 1 to 18 and 26 to 28, examples 1 to 18, where equation (7) was satisfied, tended to show a smaller value of the deceleration of the impactor and a shorter time during which the deceleration exceeded 80 G, compared to examples 26 to 28, where equation (7) was not satisfied.

[0223] Although the present invention has been described in detail with reference to specific embodiments, it will be obvious to those skilled in the art that various modifications and adaptations can be made without departing from the inventive concept and scope of protection of the present invention. The present application is based on a Japanese patent application (No. 2021-066497), filed on April 9, 2021, the contents of which are incorporated herein by reference. LIST OF REFERENCE MARKS 1 vehicle-internal display device 2 Cover glass 3 Display field 4 Backlight unit 5 Housing base element 6. Base plate 7th rib 8 Case side panel 9 (91, 92, 93, 94) bracket 10 inner section QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2016 / 027812

[0005] JP 2021-066497

[0223] < / hintergrundbeleuchtungseinheit> < / anzeigefeld> < / deckglas> < / grundzusammensetzung>

Claims

[1] Vehicle-internal display device comprising n layers from a cover glass to a housing base element and comprising at least one display field halfway through its n layers, wherein one element of each layer comprises only one plate-shaped element, or comprises the plate-shaped element and a rib, the housing base element is attached to an inner section of a vehicle at at least two attachment points, If a virtual plane passing through an intermediate point between the two fixing points and perpendicular to a line connecting the two fixing points is defined as a virtual plane R, and a length of a section line between a main surface of the cover glass and the virtual plane R is defined as a distance Z cgis defined and a length on an intersection line between a main surface of the display field and the virtual plane R from a top end to a point corresponding to the intermediate point is defined as a distance Z, a ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less, and the n layers from the cover glass to the housing base element on a virtual line L, which runs through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfy the following equation (1), [Math. 1] S>(10.021×t12+0.068−t12)×E1 In equation (1) the following applies: E1: Modulus of elasticity of the cover glass, t1: Thickness of the cover glass, and S is represented by the following equation (2), [Math. 2] S=E2⋅t22+⋯+En⋅tn2 In equation (2) the following applies: E2: Elastic modulus of a second layer, t2: Thickness of the second layer, E n : Elastic modulus of an nth layer, t n : Thickness of the nth layer, and a thickness t k any k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3), [Math. 3] tk=3a3+w2w1h3+12a(b−a2)2+12w2w1h(h2+a−b)2 In equation (3) the following applies: a: Thickness of the plate-shaped element of the k-th layer, w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer through which the virtual line L passes, w1: Distance between rib Rb1 and rib Rb2, which are located in an extension direction of a line passing through point p on the plate-shaped element through which the virtual line L passes, and perpendicular to a center line of rib Rb1, h: Thickness of rib Rb1 and rib Rb2, and b is represented by the following equation (4), [Math. 4] b=0.5w1+a2+0.5w2⋅h2+w2⋅a⋅hw1⋅a+w2⋅h where n is an integer equal to 3 or greater, h is a number equal to 0 or greater, the elastic modulus has a unit GPa, and The thickness, distance, and width have the unit mm. [2] Vehicle-internal display device comprising n layers from a cover glass to a housing base element and comprising at least one display field halfway through its n layers, wherein one element of each layer comprises only one plate-shaped element, or comprises the plate-shaped element and a rib, the housing base element is attached to an inner section of a vehicle at a mounting point, If a virtual plane passing through the fixing point and encompassing a thickness direction and a vertical direction of the cover glass at the fixing point is defined as a virtual plane R, then a length of a section line between a main surface of the cover glass and the virtual plane R is defined as a distance Z. cg is defined and a length on an intersection line between a main surface of the display field and the virtual plane R from a top end to a point corresponding to the mounting point is defined as a distance Z, a ratio Z / Z cg of the distance Z to the distance Z cg 0.6 or less, and the n layers from the cover glass to the housing base element on a virtual line L, which runs through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfy the following equation (1), [Math. 5] S>(10.021×t12+0.068−t12)×E1 In equation (1) the following applies: E1: Modulus of elasticity of the cover glass, t1: Thickness of the cover glass, and S is represented by the following equation (2), [Math. 6] S=E2⋅t22+⋯+En⋅tn2 In equation (2) the following applies: E2: Elastic modulus of a second layer, t2: Thickness of the second layer, E n : Elastic modulus of an nth layer, t n : Thickness of the nth layer, and a thickness t kany k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3), [Math. 7] tk=a3+w2w1h3+12a(b−a2)2+12w2w1h(h2+a−b)23 In equation (3) the following applies: a: Thickness of the plate-shaped element of the k-th layer, w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer through which the virtual line L passes, w1: Distance between rib Rb1 and rib Rb2, which are located in an extension direction of a line passing through point p on the plate-shaped element through which the virtual line L passes, and perpendicular to a center line of rib Rb1, h: Thickness of rib Rb1 and rib Rb2, and b is represented by the following equation (4), [Math. 8] b=0.5w1+a2+0.5w2⋅h2+w2⋅a⋅hw1⋅a+w2⋅h where n is an integer equal to 3 or greater, h is a number equal to 0 or greater, the elastic modulus has a unit GPa, and The thickness, distance, and width have the unit mm. [3] Vehicle-internal display device according to claim 1 or 2, wherein the rib Rb1 and the rib Rb2 are arranged on the same surface of the plate-shaped element. [4] Vehicle-internal display device according to one of claims 1 to 3, wherein the point p is located on the plate-shaped element and the rib Rb1 is arranged on the same surface of the plate-shaped element. [5] Vehicle-internal display device according to one of claims 1 to 4, wherein the housing base element is attached to the inner section using a bracket. [6] Vehicle-internal display device according to any one of claims 1 to 5, wherein the n layers from the cover glass to the housing base element on the virtual line L further satisfy the following equation (5), S≤−588.8t1+2660 [7] Vehicle-internal display device according to any one of claims 1 to 6, wherein the cover glass is a reinforced glass that has a compressive stress layer that is 10 µm thick or more, the cover glass has a thickness of 0.5 to 2.5 mm, the cover glass has a modulus of elasticity of 60 to 90 GPa, the display field has an elastic modulus of 60 to 90 GPa, and The base element of the housing has a modulus of elasticity of 40 to 250 GPa. [8] Vehicle-internal display device according to one of claims 1 to 7, wherein a deceleration of an impact body in a head-impact test is 50 G or more, in which the impact body collides with an impact point P on the main surface of the cover glass through which the virtual line L passes, such that an energy at the time of collision is 152 J. [9] Vehicle-internal display device according to any one of claims 1 to 8, wherein, if a mass of the vehicle's internal display device per unit area of ​​the cover glass is defined as M, and the following expressions (6) and (7) are satisfied, M≥−0.10t14+0.38t13−0.62t12+0.42t1+1.75 M≤0.03t1+2.40 where mass M is a unit g / cm 2 exhibits. [10] Vehicle-internal display device according to any one of claims 1 to 9, further comprising a housing side wall which is provided in a position facing an end surface of the display field, wherein a distance d1 between the end surface of the display field and the housing side wall is 2 mm or less. [11] Vehicle-internal display device according to any one of claims 1 to 10, wherein a distance d2 between an end of the display field and an element closer to the housing base element than the display field is 1 mm or less. [12] Vehicle-internal display device according to one of claims 1 to 11, wherein the n layers from the cover glass to the housing base element on the virtual line L satisfy the following equation (4A), [Math. 9] S≥(10.021×t12+0.068−t12)×E1+300 [13] Vehicle-internal display device in or on the dashboard, comprising n layers from a cover glass to a housing base element and comprising at least one display field halfway through its n layers, wherein one element of each layer comprises only one plate-shaped element, or comprises the plate-shaped element and a rib, the housing base element is attached to an inner section of a vehicle at at least two attachment points, if a virtual plane passing through an intermediate point between the two mounting points and perpendicular to a line connecting the two mounting points is defined as a virtual plane R, the n layers from the cover glass to the housing base element on a virtual line L passing through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device satisfy the following equation (1), [Math. 1] S>(10.021×t12+0.068−t12)×E1 In equation (1) the following applies: E1: Modulus of elasticity of the cover glass, t1: Thickness of the cover glass, and S is represented by the following equation (2), [Math. 2] S=E2⋅t22+⋯+En⋅tn2 In equation (2) the following applies: E2: Elastic modulus of a second layer, t2: Thickness of the second layer, E n : Elastic modulus of an nth layer, t n : Thickness of the nth layer, and a thickness t k any k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3), [Math. 3] tk=a3+w2w1h3+12a(b−a2)2+12w2w1h(h2+a−b)23 In equation (3) the following applies: a: Thickness of the plate-shaped element of the k-th layer, w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer through which the virtual line L passes, w1: Distance between rib Rb1 and rib Rb2, which are located in an extension direction of a line passing through point p on the plate-shaped element through which the virtual line L passes, and perpendicular to a center line of rib Rb1, h: Thickness of rib Rb1 and rib Rb2, and b is represented by the following equation (4), [Math. 4] b=0.5w1+a2+0.5w2⋅h2+w2⋅a⋅hw1⋅a+w2⋅h In equation (4) a, w1, w2 and h are the same as those in equation (3). [14] Vehicle-internal display device in or on the dashboard, comprising n layers from a cover glass to a housing base element and comprising at least one display field halfway through its n layers, wherein one element of each layer comprises only one plate-shaped element, or comprises the plate-shaped element and a rib, the housing base element is attached to an inner section of a vehicle at a mounting point, if a virtual plane passing through the mounting point and encompassing a thickness direction and a vertical direction of the cover glass at the mounting point is defined as a virtual plane R, which spans n layers from the cover glass to the housing bottom element on a virtual line L passing through a side 5 mm to the lower end from the upper end of the intersection line between the main surface of the display field and the virtual plane R in a thickness direction of the vehicle-internal display device, satisfying the following equation (1), [Math. 5] S>(10.021×t12+0.068−t12)×E1 In equation (1) the following applies: E1: Modulus of elasticity of the cover glass, t1: Thickness of the cover glass, and S is represented by the following equation (2), [Math. 6] S=E2⋅t22+⋯+En⋅tn2 In equation (2) the following applies: E2: Elastic modulus of a second layer, t2: Thickness of the second layer, E n : Elastic modulus of an nth layer, t n : Thickness of the nth layer, and a thickness t k any k-th layer from the 1 to n layers, which t1, t2 and t n encompassed is represented by the following equation (3), [Math. 7] tk=a3+w2w1h3+12a(b−a2)2+12w2w1h(h2+a−b)23 In equation (3) the following applies: a: Thickness of the plate-shaped element of the k-th layer, w2: Width of a rib Rb1 of the ribs that is closest to a point p on the plate-shaped element of the k-th layer through which the virtual line L passes, w1: Distance between rib Rb1 and rib Rb2, which are located in an extension direction of a line passing through point p on the plate-shaped element through which the virtual line L passes, and perpendicular to a center line of rib Rb1, h: Thickness of rib Rb1 and rib Rb2, and b is represented by the following equation (4), [Math. 8] b=0.5w1+a2+0.5w2⋅h2+w2⋅a⋅hw1⋅a+w2⋅h In equation (4) a, w1, w2 and h are the same as those in equation (3). [15] Vehicle-internal display device in or on the dashboard according to claim 13 or 14, wherein the rib Rb1 and the rib Rb2 are arranged on the same surface of the plate-shaped element. [16] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 15, wherein the point p is located on the plate-shaped element and the rib Rb1 is located on the same surface of the plate-shaped element. [17] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 16, wherein the housing base element is attached to the inner section using a bracket. [18] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 17, wherein the n layers from the cover glass to the housing base element on the virtual line L further satisfy the following equation (5), S≤−588.8t1+2660 [19] Vehicle-internal display device in or on the dashboard according to any one of claims 13 to 18, wherein the cover glass is reinforced glass with a compressive stress layer that is 10 µm thick or more, the cover glass has a thickness of 0.5 to 2.5 mm, the cover glass has a modulus of elasticity of 60 to 90 GPa, the display panel has a modulus of elasticity of 60 to 90 GPa, and the housing base element has a modulus of elasticity of 40 to 250 GPa. [20] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 19, wherein a deceleration of an impact body in a head impact test is 50 G or more, in which the impact body collides with an impact point P on the main surface of the cover glass through which the virtual line L passes, such that an energy at the time of collision is 152 J. [21] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 20, wherein a time during which a deceleration of an impact body in a head-impact test exceeds 80 G, in which the impact body collides with an impact point P on the main surface of the cover glass through which the virtual line L passes, is less than 3 milliseconds, such that an energy at the time of collision is 152 J. [22] Vehicle-internal display device in or on the instrument panel according to any one of claims 13 to 21, wherein, if a mass of the vehicle-internal display device per unit area of ​​the cover glass is defined as M, the following expressions (6) and (7) are satisfied, M≥−0.10t14+0.38t13−0.62t12+0.42t1+1.75 M≤0.03t1+2.40 where mass M is a unit g / cm 2 exhibits. [23] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 22, further comprising a housing side wall which is provided in a position facing an end surface of the display field, wherein a distance d1 between the end surface of the display field and the housing side wall is 2 mm or less. [24] Vehicle-internal display device in or on the dashboard according to any one of claims 13 to 23, wherein a distance d2 between an end of the display field and an element closer to the housing base element than the display field is 1 mm or less. [25] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 24, wherein the n layers from the cover glass to the case base element on the virtual line L satisfy the following equation (4A), [Math. 9] S≥(10.021×t12+0.068−t12)×E1+300 [26] Vehicle-internal display device in or on the dashboard according to any one of claims 13 to 25, wherein the cover glass is a chemically strengthened glass comprising: a thickness of 0.5 mm or more and 2.5 mm or less, a compressive stress layer having a thickness of 10 µm or more and 180 µm or less, and a surface compressive stress of 500 MPa or higher and 1200 MPa or lower. [27] Vehicle-internal display device in or on the dashboard according to one of claims 13 to 26, wherein the cover glass is a curved plate element. [28] Vehicle-internal display device in or on the dashboard according to any one of claims 13 to 27, wherein a material of the housing base element comprises at least one selected from the group consisting of a metal, an alloy, a resin and a stacked body of a resin layer and a metal layer. [29] Vehicle-internal display device according to one of claims 1 to 12, wherein the housing base element is attached to a dashboard of the vehicle. [30] Vehicle-internal display device according to one of claims 1 to 12 or 29, wherein the cover glass is a curved plate element. [31] Vehicle-internal display device according to one of claims 1 to 28 or 29 or 30, wherein a material of the housing base element comprises at least one selected from the group consisting of a metal, an alloy, a resin and a stacked body of a resin layer and a metal layer.

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