Display device

Abstract

To suppress damage to a cover member even in the state of being fixed to a vehicle side to the vicinity of an upper end.SOLUTION: Provided is an on-vehicle display device, in which a cover member 2, a display panel 3 and a bottom member 5 fixed to a vehicle are laminated in this order, the bottom member 5 having a plate part, a rib, and at least two fixed points. When a ratio YH / YHcg between YH and YHcg meaning a specific distance is 0.5 or less, a specific virtual line passing through a specific point and the bottom member 5 is defined as a virtual line D, and n is defined as an integer greater than or equal to 2, members up to an n-th layer, setting the cover member 2 as a first layer, except the bottom member 5, are arranged on the virtual line D on the virtual line D, and the following formula (1) is satisfied, where t is a thickness (mm) in a first direction of the cover member, Q is a value calculated by the following formula (2), ED is a Young's modulus (GPa) of the bottom member, Ecg is a Young's modulus (GPa) of the cover member, and En is a Young's modulus (GPa) of the member of the n-th layer.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a display device. [Background technology]

[0002] Some in-vehicle display devices that display information necessary during driving have a display panel and a cover member that covers the display panel. In such display devices, it is required to suppress damage to the cover member even when the display device is subjected to an impact. For example, Patent Document 1 describes an in-vehicle display device that can improve the impact resistance of the end of the cover member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 027812 Summary of the Invention [Problem to be solved by the invention]

[0004] For in-vehicle displays, the way in which impact is transmitted to the cover member changes depending on the mounting position on the vehicle. For this reason, it is necessary to prevent damage to the cover member even when the display device is mounted on the vehicle up to the upper end.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a display device that can prevent damage to the cover member even when the display device is fixed to the vehicle side up to near the upper end. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the display device according to the present embodiment is as follows. A display device for vehicle mounting in which a cover member, a display panel, and a bottom member fixed to a vehicle are laminated in this order, wherein when a direction from the cover member toward the bottom member in a thickness direction of the cover member is defined as a first direction, the cover member has a first main surface opposite to the first direction, a second main surface on the first direction side, an end surface connecting the first main surface and the second main surface, and a corner portion formed by the first main surface and the end surface, the bottom member has a plate portion and a rib protruding from the main surface of the plate portion on the first direction side, at least two fixing points that are fixed to the vehicle are formed on the main surface on the first direction side, a virtual plane R passes through a midpoint between two of the fixing points and is perpendicular to a line connecting the two fixing points, and a length of an intersection line between the main surface of the cover member and the virtual plane R is defined as a distance YH cg and the length from the upper end to the point corresponding to the midpoint of the line of intersection between the main surface of the display panel and the imaginary surface R is a distance YH, the distance YH and the distance YH cg Ratio of YH / YH cg is 0.5 or less, a position of the corner of the cover member where the distance from the two fixed points is equal is defined as an equidistant point, a position on the corner within a predetermined distance range from the equidistant point is defined as a reference point, a virtual line that passes through the reference point and the bottom member and is inclined at an angle of 30° to 45° with respect to the first direction is defined as a virtual line D, and n is an integer of 2 or more, a display device in which the cover member is defined as a first layer, and components up to the nth layer excluding the bottom member are arranged on the virtual line D, and the following formula (1) is satisfied. In formula (1), t is the thickness (mm) of the cover member in the first direction, and Q is a value calculated by the following formula (2). In formula (2), E D is the Young's modulus of the base member (GPa), and E cg is the Young's modulus (GPa) of the cover member, and E n is the Young's modulus (GPa) of the nth layer of the material, and t n is the thickness (mm) of the nth layer member in the first direction in the region passing through the virtual line D, and t D is the value calculated by the following formula (3). In equation (3), a is the thickness (mm) of the plate portion of the bottom member in the first direction, w2 is the width (mm) of the first rib of the ribs of the bottom member that is closest to the point on the plate portion through which the virtual line D passes, w1 is the distance (mm) between the first rib and the second rib that is located in the direction of a line that passes through the point on the plate portion through which the virtual line D passes and is perpendicular to the center line of the first rib, h is the thickness (mm) of the rib in the first direction, and b is expressed by the following equation (4). In the formula (4), a, w1, w2 and h are the same as in the formula (3).

[0007]

number

[0008] In order to solve the above-mentioned problems and achieve the object, a display device according to another embodiment is as follows. A display device for vehicle mounting in which a cover member, a display panel, and a bottom member fixed to a vehicle are laminated in this order, wherein when a direction from the cover member toward the bottom member in a thickness direction of the cover member is defined as a first direction, the cover member has a first main surface opposite to the first direction, a second main surface on the first direction side, an end surface connecting the first main surface and the second main surface, and a corner formed by the first main surface and the end surface, the bottom member has a plate portion and a rib protruding from the main surface of the plate portion on the first direction side, and one fixing point for fixing to the vehicle is formed on the main surface on the first direction side, and a virtual plane R that passes through the fixing point and includes the thickness direction and vertical direction of the cover member at the fixing point is defined as a virtual plane R, and a length of an intersection line between the main surface of the cover member and the virtual plane R is defined as a distance YH cg and the length from the upper end of the intersection line between the main surface of the display panel and the imaginary surface R to the point corresponding to the fixed point is defined as a distance YH. cg Ratio of YH / YH cgis 0.5 or less, the positions of the corners of the cover member that are the shortest from the fixed point are defined as equidistant points, and a position on the corners that is within a predetermined distance range from the equidistant points is defined as a reference point, and a virtual line that passes through the reference point and the bottom member and is inclined at an angle of 30° to 45° with respect to the first direction is defined as a virtual line D, and n is an integer of 2 or more, when the cover member is defined as a first layer and the bottom member is excluded, a display device that satisfies the following formula (1). In formula (1), t is the thickness (mm) of the cover member in the first direction, and Q is a value calculated by the following formula (2). In formula (2), E D is the Young's modulus of the base member (GPa), and E cg is the Young's modulus (GPa) of the cover member, and E n is the Young's modulus (GPa) of the nth layer of the material, and t n is the thickness (mm) of the nth layer member in the first direction in the region passing through the virtual line D, and t D is the value calculated by the following formula (3). In equation (3), a is the thickness (mm) of the plate portion of the bottom member in the first direction, w2 is the width (mm) of the first rib of the ribs of the bottom member that is closest to the point on the plate portion through which the virtual line D passes, w1 is the distance (mm) between the first rib and the second rib that is located in the direction of a line that passes through the point on the plate portion through which the virtual line D passes and is perpendicular to the center line of the first rib, h is the thickness (mm) of the first rib and the second rib in the first direction, and b is expressed by the following equation (4). In the formula (4), a, w1, w2 and h are the same as in the formula (3).

[0009]

number

[0010] According to the present invention, even in a state where the display device is fixed to the vehicle side up to near the upper end thereof, damage to the cover member can be suppressed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing a display device according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is a schematic diagram of the bottom member. [Figure 4] FIG. 4 is a schematic diagram of the display device as viewed from the display surface side. [Diagram 5] FIG. 5 is a cross-sectional view taken along line BB of FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line CC of FIG. [Figure 7A] FIG. 7A is a schematic partial enlarged view of another example of the cover member. [Figure 7B] FIG. 7B is a schematic partial enlarged view of another example of the cover member. [Figure 8] FIG. 8 is a schematic diagram showing another example of a cross section of a display device. [Figure 9] FIG. 9 is a schematic partial enlarged view of the bottom member. [Figure 10] FIG. 10 is a schematic cross-sectional view of a display device according to another embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram of a display device according to another example of this embodiment. [Figure 12] FIG. 12 is a cross-sectional view taken along line DD of FIG. [Figure 13] FIG. 13 is a schematic diagram of a display device according to another example of this embodiment. [Figure 14] FIG. 14 is a schematic diagram showing the positions of the ribs of the bottom member in this embodiment. [Figure 15] FIG. 15 is a schematic diagram showing the positions of ribs on a bottom member in another example of this embodiment. [Figure 16] FIG. 16 is a schematic diagram showing the positions of ribs on a bottom member in another example of this embodiment. [Figure 17] FIG. 17 is a schematic diagram showing the positions of ribs of a bottom member in another example of this embodiment. [Figure 18] FIG. 18 is a schematic diagram showing a rib having a trapezoidal cross-sectional shape. [Figure 19] FIG. 19 is a schematic diagram of a display device according to another example of this embodiment. [Figure 20] FIG. 20 is a schematic front view of a display device in an embodiment. [Figure 21] FIG. 21 is a graph showing the Q value and the evaluation results in each example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment, and when there are multiple embodiments, the present invention also includes a combination of the embodiments. Numerical values ​​include the range of rounding.

[0013] (1. Display Device Configuration) FIG. 1 is a schematic diagram showing a display device according to the present embodiment. As shown in FIG. 1, the display device 1 according to the present embodiment is an in-vehicle display device provided in a vehicle. The display device 1 is, for example, a car navigation device, but the use is arbitrary, and it may be other display devices mounted on a vehicle, such as a display audio. As will be described in detail later, the display device 1 is fixed to an interior part 10 of the vehicle via a fixing point P formed on the back surface opposite to the display surface. The interior part 10 is a member provided inside the vehicle, for example, a part of the dashboard of the vehicle. Hereinafter, the thickness direction of the display device 1, that is, the direction from the display surface to the back surface, is referred to as the first direction. In Figs. 1 to 17 and 20, the first direction is referred to as the Z direction, the direction perpendicular to the Z direction and heading in one direction along the horizontal plane when the display device 1 is attached to the vehicle (to the right in the example of Fig. 1) is referred to as the X direction, and the direction perpendicular to the Z direction and the X direction, heading vertically upward, is referred to as the Y direction. In this embodiment, the end of the display device 1 on the Y direction side is the end (upper end) on the vertically upper side. In addition, for the first direction, Z direction, X direction, and Y direction, the "direction" is used as a concept having a direction. That is, when it is referred to as the "Z direction," it refers to the direction defined above, and when it is referred to as the "opposite Z direction," it refers to the direction opposite to the direction defined above.

[0014] 2 is a cross-sectional view taken along the line AA in FIG. 1. As shown in FIG. 2, the display device 1 includes a cover member 2, a display panel 3, a backlight unit 4, a bottom member 5, and a sidewall member 8. In the display device 1, the cover member 2, the display panel 3, the backlight unit 4, and the bottom member 5 are arranged in the Z direction in the order of (overlapping) and a frame-shaped sidewall member 8 is arranged around the cover member 2, the display panel 3, and the backlight unit 4. That is, the bottom member 5 and the sidewall member 8 form a housing that houses the cover member 2 and the display panel 3, and the bottom member 5 covers the back surfaces (surfaces opposite to the display side surfaces) of the cover member 2 and the display panel 3, and the sidewall member 8 covers the side surfaces of the cover member 2 and the display panel 3.

[0015] (Cover material) The cover member 2 is a transparent plate-like member that transmits visible light. The cover member 2 has a first main surface 2A that is the main surface on the side opposite to the Z direction (the display surface side), a second main surface 2B that is the main surface on the Z direction side, and an end surface 2C that connects the first main surface 2A and the second main surface 2B. The end surface 2C can also be considered as a side surface of the cover member 2. Hereinafter, an edge portion of the cover member 2 formed by the first main surface 2A and the end surface 2C is referred to as a corner portion 2D. The corner portion 2D can also be considered as a boundary portion between the first main surface 2A and the end surface 2C.

[0016] The thickness t of the cover member 2 is preferably 0.5 to 2.5 mm, more preferably 0.7 to 2.0 mm, and even more preferably 1.1 to 1.3 mm. Here, the thickness t is preferably 0.5 mm or more, more preferably 0.7 mm or more, and even more preferably 1.1 mm or more. The thickness t of the cover member 2 is preferably 2.5 mm or less, more preferably 2.0 mm or less, and even more preferably 1.3 mm or less. The thickness t is the length in the Z direction from the first main surface 2A to the second main surface 2B.

[0017] In this embodiment, the cover member 2 is a rectangular flat plate when viewed from the Z direction. For example, when the cover member 2 is rectangular, the size of the cover member 2 is such that the length in the longitudinal direction (X direction in this embodiment) is 100 mm or more and 800 mm or less, and the length in the lateral direction (Y direction in this embodiment) is 40 mm or more and 300 mm or less. However, the cover member 2 is not limited to a rectangular flat plate when viewed from the Z direction, and may be any shape, such as an elliptical shape when viewed from the Z direction, or a curved shape. The size of the cover member 2 may also be arbitrary.

[0018] Young's modulus of cover member 2 (E cg ) is preferably 60 to 90 GPa, more preferably 70 to 80 GPa, and further preferably 70 to 75 GPa. cg The Young's modulus (E cg ) is preferably 90 GPa or less, more preferably 80 GPa or less, and even more preferably 75 GPa or less. The Young's modulus of each member including the cover member 2 may be determined by a tensile test (JIS K7161-1, 2:2014, JIS K7113:1995).

[0019] The cover member 2 is made of glass. When the cover member 2 is made of glass, the cover member 2 is preferably made of strengthened glass such as chemically strengthened glass. When the cover member 2 is made of tempered glass, the thickness (DOL) of the compressive stress layer of the cover member 2 is, for example, preferably 10 to 180 μm, more preferably 15 to 180 μm, even more preferably 25 to 50 μm, and even more preferably 30 to 50 μm. Here, the thickness (DOL) of the compressive stress layer is preferably 10 μm or more, more preferably 15 μm or more, even more preferably 25 μm or more, and even more preferably 30 μm or more. Moreover, the thickness (DOL) of the compressive stress layer is, for example, preferably 180 μm or less, and more preferably 50 μm or less. The surface compressive stress (CS) of the compressive stress layer is preferably 500 MPa or more, more preferably 650 MPa or more, and even more preferably 750 MPa or more. There is no particular upper limit, but for example, CS is preferably 1200 MPa or less. A typical method for obtaining chemically strengthened glass by chemically strengthening glass is to immerse the glass in KNO3 molten salt, perform ion exchange treatment, and then cool it to about room temperature. The treatment conditions such as the temperature of the KNO3 molten salt and the immersion time may be set so that the surface compressive stress and the thickness of the compressive stress layer are the desired values. Examples of glass types include soda lime glass, aluminosilicate glass (SiO2-Al2O3-Na2O-based glass), etc. Among these, aluminosilicate glass is preferable from the viewpoint of strength. Examples of glass materials include glass materials containing, in mole percentages based on oxides, 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. Chemically strengthened glass based on aluminosilicate glass (for example, "Dragontrail (registered trademark)" manufactured by AGC) is also preferably used. However, the cover member 2 is not limited to glass, and may be, for example, a transparent resin member.

[0020] (Display panel) The display panel 3 is a panel that displays an image, and is disposed on the Z direction side of the cover member 2 so as to overlap with the cover member 2. The display surface of the display panel 3, which is the surface opposite to the Z direction, is adhered to the second main surface 2B of the cover member 2 by an adhesive layer (not shown). The adhesive layer is, for example, an OCA (Optical Clear Adhesive) film or OCA tape, and its thickness (length in the Z direction) is, for example, 5 μm or more and 400 μm or less, and preferably 50 μm or more and 200 μm or less. Here, the thickness (length in the Z direction) of the adhesive layer is preferably 5 μm or more, more preferably 50 μm or more, and also preferably 400 μm or less, and more preferably 200 μm or less.

[0021] The display panel 3 is a liquid crystal panel, an organic electro-luminescence (EL) panel, a flexible organic EL panel, a plasma display panel (PDP), an electronic ink type panel, etc., and may have a touch panel, etc. When the display panel 3 has a glass substrate, the glass substrate is the thickest and governs the rigidity of the entire display panel. For this reason, the Young's modulus of the glass substrate may be regarded as the Young's modulus of the display panel 3. The Young's modulus of the display panel 3 is preferably 2 to 90 GPa, more preferably 60 to 90 GPa, and even more preferably 70 to 75 GPa. Here, the Young's modulus is preferably 2 GPa or more, more preferably 60 GPa or more, and even more preferably 70 GPa or more. The Young's modulus of the display panel 3 is preferably 90 GPa or less, and more preferably 75 GPa or less. The thickness of the display panel 3 is preferably 0.05 to 2.0 mm, more preferably 1.0 to 2.0 mm, and even more preferably 1.1 to 1.3 mm. Here, the thickness is preferably 0.05 mm or more, more preferably 1.0 mm or more, and even more preferably 1.1 mm or more. The thickness of the display panel 3 is preferably 2.0 mm or less, and more preferably 1.3 mm or less. The thickness of the display panel 3 is the length in the Z direction from the main surface of the display panel 3 on the opposite side to the Z direction to the main surface on the Z direction side.

[0022] As shown in FIG. 1, the distance A1 is the distance from the end of the cover member 2 in the Y direction to the end of the display panel 3 in the Y direction when viewed from the Z direction. From the viewpoint of adhering and holding the cover member 2 with sufficient adhesive strength, the distance A1 is preferably 2 mm or more and 30 mm or less, and more preferably 5 mm or more and 20 mm or less. Here, the distance A1 is preferably 2 mm or more, more preferably 5 mm or more, and is preferably 30 mm or less, and more preferably 20 mm or less. The numerical range of the distance A1 can also be applied to the distance from the end of the cover member 2 on the opposite side to the Y direction to the end of the display panel 3 on the opposite side to the Y direction. 1, the distance from the end of the cover member 2 in the X direction to the end of the display panel 3 in the X direction as viewed from the Z direction is defined as distance A2. From the viewpoint of adhesive strength and design, distance A2 is preferably 2 mm or more and 200 mm or less, and more preferably 5 mm or more and 150 mm or less. Here, distance A2 is preferably 2 mm or more, more preferably 5 mm or more, and is preferably 200 mm or less, and more preferably 150 mm or less. The numerical range of distance A2 can also be applied to the distance from the end of the cover member 2 opposite to the X direction to the end of the display panel 3 opposite to the X direction.

[0023] (Backlight unit) The backlight unit 4 is a light source that irradiates the display panel 3 with light for displaying an image, and is disposed on the Z direction side of the display panel 3 so as to overlap with the display panel 3.

[0024] The backlight unit 4 is generally composed of components such as a lens sheet, a diffusion sheet, a light guide plate, lamps, and a reflector. Among these components, the light guide plate is usually the thickest, and the light guide plate controls the rigidity of the entire backlight unit 4. For this reason, the Young's modulus of the light guide plate may be regarded as the Young's modulus of the backlight unit 4. The Young's modulus of the backlight unit 4 is preferably 1 to 90 GPa, more preferably 2 to 85 GPa, and even more preferably 60 to 85 GPa. Here, the Young's modulus is preferably 1 GPa or more, more preferably 2 GPa or more, and even more preferably 60 GPa or more. The Young's modulus of the backlight unit 4 is preferably 90 GPa or less, and more preferably 85 GPa or less. The thickness of the backlight unit 4 is preferably 1 to 10 mm, more preferably 2 to 6 mm, and even more preferably 3 to 5 mm. Here, the thickness is preferably 1 mm or more, more preferably 2 mm or more, and even more preferably 3 mm or more. The thickness of the backlight unit 4 is preferably 10 mm or less, more preferably 6 mm or less, and even more preferably 5 mm or less. The thickness of the backlight unit 4 is the length in the Z direction from the main surface of the backlight unit 4 on the opposite side to the Z direction to the main surface on the Z direction side.

[0025] The display device 1 does not necessarily need to be provided with a backlight unit 4. In this case, the display device 1 is arranged in the Z direction with the cover member 2, the display panel 3, and the bottom member 5 arranged side by side (overlapping) in this order. When the backlight unit 4 is not provided, a self-luminous display panel that does not require the backlight unit 4, such as an organic EL panel or a micro LED panel, is selected as the display panel 3.

[0026] (Bottom member) The bottom member 5 is disposed on the Z direction side of the display panel 3 (the backlight unit 4 in this embodiment) so as to overlap with the display panel 3 (the backlight unit 4 in this embodiment), and can be considered as the bottom part of the housing.

[0027] The bottom member 5 includes a plate portion 6 and a rib 7. The plate portion 6 is a plate-like member arranged to overlap the display panel 3. The rib 7 is a member formed to protrude from a main surface 6B of the plate portion 6 on the Z direction side, and is in a quadrangular prism shape in this embodiment. By forming the bottom member 5 in a shape having the rib 7, the display device 1 can be made lighter than if the bottom member 5 were in a thick plate shape without the rib 7.

[0028] FIG. 3 is a schematic diagram of a bottom member. When the bottom member 5 of this embodiment is viewed from the Z direction as shown in FIG. 3, a plurality of ribs 7 are provided in a lattice pattern in the bottom member 5. Specifically, a plurality of ribs 7 (ribs 71, ribs 72, ribs 73, and ribs 74) extending in the Y direction in FIG. 3 intersect with a plurality of ribs 7 (ribs 75, ribs 76, and ribs 77) extending in the X direction in FIG. 3. However, the shape of the ribs 7 is not limited to that shown in FIG. 3 and may be any shape. For example, the ribs 7 may be curved instead of a linear shape, and may not be provided in a lattice pattern. The bottom member 5 may not have the ribs 7. In this case, the bottom member 5 is composed of only the plate portion 6.

[0029] 5, a fixing point P is formed on a main surface 5A on the Z direction side of the bottom member 5. The fixing point P is a location that serves as an interface for fixing the bottom member 5 to the vehicle (to the interior portion 10 in this embodiment), and is a location to which a bracket 9, which will be described later, is attached in this embodiment. The bottom member 5 is fixed to the bracket 9 with the main surface 5A in contact with the fixed member (here, the bracket 9). If the area of ​​the main surface 5A that is in contact with the fixed member is defined as the contact area, then the fixed point P can be said to be a point on the contact area. The fixed point P can be any position on the contact area, and can be, for example, the midpoint in the X direction of the side of the contact area that is located on the opposite side in the Y direction. It can be said that one fixed point P is formed for each contact area. In other words, when there are multiple fixed points P, it can be said that multiple contact areas are formed at separate positions, and one fixed point P is formed in each contact area. When there is one fixed point P, it can be said that there is also one contact area. For example, when the bottom member 5 is fixed to the bracket 9, the fixing point P may be a position of the main surface 5A that overlaps with the midpoint of one side of the end of the convex surface 9a of the bracket 9 (i.e., the midpoint in the X direction of the side opposite to the Y direction of the contact area). When the bottom member 5 is fixed to the bracket 9 with a fastener such as a bolt, the fixing point P may be a location of the main surface 5A where a hole (e.g., a bolt hole) into which the fastener is inserted is opened, or when the bottom member 5 is fixed to the bracket 9 with a plurality of fasteners, the fixing point P may be a center position between the locations where the holes (e.g., bolt holes) into which the fasteners are inserted are opened. When the bottom member 5 is fixed to the bracket 9 with an adhesive or the like, the fixing point P may be a point on the main surface 5A on the contact area where the adhesive is applied. For example, a protrusion may be formed on the main surface 5A of the bottom member 5, and the protrusion may be inserted into a recess formed in the vehicle (in the present embodiment, the interior part 10), thereby fixing the bottom member 5 to the vehicle. In this case, the protrusion of the bottom member 5 may be regarded as the bracket 9 without providing a separate bracket 9. In this case, the surface of the protrusion of the bottom member 5 on the Z direction side becomes the contact area, and a point on the contact area may be the fixed point P. In addition, for example, a recess may be formed on the main surface 5A of the bottom member 5, and a protrusion formed on the vehicle (in this embodiment, the interior part 10) may be inserted into the recess on the main surface 5A to be fixed to the vehicle. In this case, the protrusion of the vehicle may be regarded as the bracket 9 without providing a separate bracket 9. In this case, the surface of the recess of the bottom member 5 on the Z direction side becomes the contact area, and a point on the contact area may be the fixed point P. The position of the fixed point P will be described later.

[0030] When the bottom member 5 has the rib 7, the Young's modulus is preferably 1.5 GPa or more and 100 GPa or less, and more preferably 40 GPa or more and 80 GPa or less. Here, when the bottom member 5 has the rib 7, the Young's modulus is preferably 1.5 GPa or more, more preferably 40 GPa or more, and is preferably 100 GPa or less, and more preferably 80 GPa or less. When the bottom member 5 does not have the rib 7, the Young's modulus is preferably 40 GPa or more and 250 GPa or less, and more preferably 60 GPa or more and 230 GPa or less. Here, when the bottom member 5 does not have the rib 7, the Young's modulus is preferably 40 GPa or more, more preferably 60 GPa or more, and is preferably 250 GPa or less, and more preferably 230 GPa or less.

[0031] The material of the bottom member 5 is preferably, for example, a metal (simple substance) or an alloy containing a metal element such as aluminum or magnesium. The material of the bottom member 5 may be a resin or a laminate of a resin layer and a metal layer.

[0032] (Side wall member) The side wall member 8 is a frame-shaped member provided so as to surround the cover member 2, the display panel 3, and the backlight unit 4 when viewed from the Z direction, and can be said to be a side wall portion of the housing.

[0033] In FIG. 2, in the example of this embodiment, the sidewall member 8 has sidewall members 8a and 8b. The sidewall member 8a includes members 8a1 and 8a2. The member 8a1 is a frame-shaped portion surrounding the cover member 2. The member 8a2 is a portion that protrudes from the end of the member 8a1 on the Z direction side toward the inside in the radial direction when the central axis of the cover member 2 along the Z direction is the axial direction. The central axis of the cover member 2 is an axis that passes through the center point of the cover member 2 when viewed from the Z direction and extends in the Z direction. The member 8a2 supports an area on the outer periphery side of the second main surface 2B of the cover member 2 on the Z direction side with a surface on the opposite side to the Z direction protruding from the member 8a1. In this embodiment, the member 8a2 and the cover member 2 are bonded via an adhesive layer. The side wall member 8b is a frame-shaped member provided on the Z direction side of the side wall member 8a, and in this embodiment, is disposed so as to surround the display panel 3 and the backlight unit 4. In this embodiment, the surface of the side wall member 8b opposite to the Z direction is adhered to the side wall member 8a via an adhesive layer.

[0034] The shapes of the sidewall members 8a and 8b are not limited to those described above and may be any shape. In the present embodiment, the sidewall member 8 includes two sidewall members 8a and 8b, but the configuration of the sidewall member 8 is not limited thereto and may be any shape. For example, the sidewall member 8 may be composed of one member, or may be composed of three or more members.

[0035] The Young's modulus of the sidewall member 8 is preferably 1 GPa or more and 250 GPa or less, and more preferably 2 GPa or more and 20 GPa or less. Here, the Young's modulus is preferably 1 GPa or more, more preferably 2 GPa or more, and is preferably 250 GPa or less, and more preferably 20 GPa or less. When the sidewall member 8 is composed of a plurality of members, it is preferable that the Young's modulus of each member is within the above range.

[0036] The material of the sidewall member 8 is preferably, for example, a metal (simple substance) or an alloy containing a metal element such as aluminum or magnesium. The material of the sidewall member 8 may be a resin or a laminate of a resin layer and a metal layer. When the sidewall member 8 is composed of a plurality of members, each member may be made of a different material.

[0037] In this embodiment, the sidewall member 8 is a separate member from the bottom member 5, but this is not limited thereto, and the sidewall member 8 and the bottom member 5 may be an integral member. For example, among the multiple members constituting the sidewall member 8, some may be integral with the bottom member 5 and the other may be separate from the bottom member 5. That is, for example, the sidewall member 8b may be integral with the bottom member 5 and the sidewall member 8a may be separate from the bottom member 5.

[0038] The display device 1 of this embodiment has the above-mentioned configuration, but the display device 1 may have any configuration without being limited to the above description. For example, the display device 1 may have a configuration in which any member up to the nth layer, excluding the bottom member, is arranged on a virtual line D described later, with the cover member 2 as the first layer. Also, for example, in the example of this embodiment, the bottom member 5 is arranged on the furthest side in the Z direction among the members of the display device 1, but this is not limited thereto, and for example, a member may be provided on the Z direction side of the bottom member 5. That is, even if there is another member on the Z direction side of the bottom member 5, the layer (bottom member 5) on which the fixed point P is formed is treated as the bottom member in this embodiment. In other words, the layer on which the fixed point P is formed and which is furthest in the Z direction is treated as the bottom member 5.

[0039] (2. Fixation of the display device) Next, a state in which the display device 1 is fixed to the interior portion 10 of the vehicle will be described. The fixing of the display device 1 will be described below. Fig. 4 is a schematic diagram of the display device as viewed from the display surface side, and Fig. 5 is a cross-sectional view taken along line BB in Fig. 1.

[0040] (fixed point) As described above, the fixed points P are formed on the main surface 5A on the Z direction side of the bottom member 5 of the display device 1, and are fixed to the interior part 10. In this embodiment, a plurality of fixed points P are provided, and in the example of FIG. 4, four fixed points P1, P2, P3, and P4 are provided. The fixed points P1 and P2 are aligned in the X direction (the width direction of the vehicle when attached to the vehicle). The fixed points P3 and P4 are located on the opposite side of the Y direction (vertically downward when attached to the vehicle) from the fixed points P1 and P2, and are aligned in the X direction. The line passing through the fixed points P1 and P2 and the line passing through the fixed points P3 and P4 are parallel to each other, and the fixed points P1 to P4 form the four vertices of a rectangle.

[0041] 1, 2, 4, and 5, a bracket 9, which is a fixing member, may be attached to the fixing point P. In that case, the bottom member 5 is fixed to the interior portion 10 via the bracket 9. In the example of this embodiment, as shown in FIG. 4, a bracket 91 is attached to the fixing point P1, a bracket 92 is attached to the fixing point P2, a bracket 93 is attached to the fixing point P3, and a bracket 94 is attached to the fixing point P4.

[0042] As shown in FIG. 5, the bracket 9 is a long plate-like member and is bent into a U-shape. The center of the bracket 9 in the plate width direction is positioned at the fixed point P. The bracket 9 has one side of the end of a convex surface 9a (the surface opposite to the Y direction in FIG. 5) formed by bending into a U-shape and is in contact with the fixed point P. The direction perpendicular to the convex surface 9a of the bracket 9 perpendicularly intersects with the X direction (the width direction of the vehicle). The bracket 9 has one surface 9b connected to the convex surface 9a in contact with the bottom member 5, and the other surface 9c connected to the convex surface 9a in contact with the interior part 10. That is, the position of the main surface 5A of the bottom member 5 that overlaps with the midpoint of one side of the end of the convex surface 9a of the bracket 9 (i.e., the midpoint in the X direction of the side opposite to the Y direction of the contact area) is the fixed point P. The bracket 9 is fixed to the bottom member 5 and the interior part 10 by, for example, screws (not shown). The shape of the bracket 9 is not limited to the above description and may be any shape, for example, be bent in an S-shape.

[0043] Since the display device 1 is attached to the vehicle via the bracket 9 in this manner, the display device 1 and the bracket 9 can be said to constitute a display device unit. Furthermore, the bottom member 5 may be fixed to the interior portion 10 without using the bracket 9, for example, by deforming a part of the bottom member 5. Conversely, a part of the interior portion 10 may be deformed and fixed to the bottom member 5. In this case, each fixing point P may be defined as the center of each fixing location.

[0044] The positions and number of the fixed points P are not limited to those described above. Any number of fixed points P may be formed, and in that case, the positions of the fixed points P may also be arbitrary.

[0045] (midpoint PQ) Hereinafter, the position of the fixed point P in the Y direction relative to the display device 1 (YH / YH cg In order to explain the above, the intermediate point PQ is defined. The intermediate point PQ is the midpoint between the fixed point P1 and the fixed point P2. If the distance between the intermediate point PQ and the fixed point P1 (or the distance between the intermediate point PQ and the fixed point P2) is defined as the distance X, then from the viewpoint of vibration characteristics (JIS D 1601: 1995 Automotive Parts Vibration Test Method), the distance X is preferably 30 mm or more and 200 mm or less, and more preferably 50 mm or more and 130 mm or less. Here, the distance X is preferably 30 mm or more, more preferably 50 mm or more, and also preferably 200 mm or less, and more preferably 130 mm or less. If the distance between the fixed point P1 and the fixed point P3 (or the distance between the fixed point P2 and the fixed point P4) arranged in the Y direction is defined as the distance Y, then the distance Y is preferably 30 mm or more and 200 mm or less, and more preferably 35 mm or more and 125 mm or less, for the same reason. Here, the distance Y is preferably 30 mm or more, more preferably 35 mm or more, and is preferably 200 mm or less, more preferably 125 mm or less.

[0046] As described above, the number and positions of the fixed points P are arbitrary, so the definition of the intermediate points PQ for each variation in the position of the fixed points P will be described below.

[0047] Of the fixed points P provided on the bottom member 5, two fixed points P are selected from the Y direction side (vertically upward), and the midpoint of the two selected fixed points P is set as the intermediate point PQ. For example, Figs. 1 to 5 show an embodiment in which the bottom member 5 is fixed to the interior portion 10 at four fixed points P (fixed points P1 to P4) arranged in pairs in the Y direction. As shown in Figs. 1 to 5, when there are multiple fixed points P in the Y direction, the two fixed points furthest to the Y direction (fixed points P1 and P2 in Figs. 1 to 4) are used as the fixed points P for defining the intermediate point PQ (and thus the virtual plane R described later).

[0048] When three or more fixed points P exist at the same position (same height) in the Y direction, two fixed points P with the narrowest distance between them are selected, and their midpoint is taken as the midpoint PQ. When three or more fixed points exist at equal intervals at the same position in the Y direction, the midpoint of any two fixed points P may be taken as the midpoint PQ. In other words, when there are multiple candidates for the midpoint PQ (and thus the virtual plane R described below), it is sufficient that any one of them satisfies the requirements of this embodiment.

[0049] The bottom member 5 may be fixed to the interior part 10 at three fixed points P. For example, referring to FIG. 4, it is assumed that there are no fixed points P1 and P2, and instead, another fixed point P' (not shown in FIG. 4, etc.) exists on the line connecting the fixed points P1 and P2. In this case, the bottom member 5 is fixed to the interior part 10 at three points, the fixed points P3, P4, and P'. At this time, if there is no difference in the position (height) in the Y direction between the fixed points P3 and P4, the fixed point closer to the fixed point P' is selected, and the midpoint between the selected fixed point and the fixed point P' is set as the intermediate point PQ. If there is no difference in the distance to the fixed point P', an arbitrary one is selected, and the midpoint between the selected fixed point and the fixed point P' is set as the intermediate point PQ. In addition, if fixed points P3 and P4 are at different positions in the Y direction, as with the specification for four fixed points P, two fixed points P (fixed point P' and the fixed point on the Y direction side of fixed points P3 and P4) are selected from the Y direction side, and the midpoint between the selected fixed points is set as the intermediate point PQ.

[0050] (YH / YH cg ) As shown in Fig. 4, a plane that passes through the midpoint PQ and is perpendicular to the line connecting the fixed points P1 and P2 (the two fixed points P used to define the midpoint PQ) is defined as a virtual plane R. Also, as shown in Fig. 5, the length of the intersection line between the cover member 2 and the virtual plane R is defined as a distance YH cg5, the length of the intersection line between the main surface of the display panel 3 and the imaginary plane R from the upper end (end on the Y direction side) of the display panel 3 to a point corresponding to the midpoint PQ is defined as a distance YH. Note that the "point corresponding to the midpoint PQ" is a point located on the main surface of the display panel 3 by moving the midpoint PQ in the thickness direction (Z direction) of the display device 1.

[0051] The display device 1 is located at a distance YH and a distance YH cg Ratio of YH / YH cg The position of the fixed point P is set so that the ratio YH / YH is 0.5 or less. In other words, the display device 1 is an "in-dash type or on-dash type (hereinafter, simply referred to as "in-dash type") display device in which the vicinity of the upper end is also fixed to the interior part 10. The display device 1 has a ratio YH / YH cg is preferably 0.1 or more and 0.5 or less, and more preferably 0.3 or more and 0.5 or less. Here, the ratio YH / YH cg is preferably 0.1 or more, and more preferably 0.3 or more. In addition, the ratio YH / YH cg If is greater than 0.5, it can be said to be a "standing type" in which only the lower end of the base member is fixed to the dashboard.

[0052] The display device 1 is fixed to the vehicle in the above manner.

[0053] (3. Structure for preventing damage to the cover member) In an in-vehicle display device, the way in which an impact is transmitted to the cover member changes depending on the state in which it is fixed to the vehicle side, and even in an in-dash type display device 1 such as the present embodiment, it is required to suppress damage to the cover member 2. In particular, it is required to impart excellent impact resistance (hereinafter referred to as "end impact resistance") to the end of the cover member 2 as evaluated by a head impact test. Below, a configuration for improving the end impact resistance of the cover member 2 and suppressing damage will be described.

[0054] (Equidistant point H0 and reference point H) In order to explain the improvement of the end impact resistance of the cover member 2, an equidistant point H0 and a reference point H are defined. As shown in FIG. 4, the equidistant point H0 is a position on the corner 2D on the Y direction side of the cover member 2 that is equidistant from each of the two fixed points P used to define the intermediate point PQ when viewed from the Z direction. In the example of this embodiment, the fixed points P1 and P2 are used to define the intermediate point PQ, so that the equidistant point H0 is a point on the corner 2D on the Y direction side of the cover member 2 that is equidistant from the fixed point P1 and the fixed point P2 when viewed from the Z direction. That is, in the example of this embodiment, the distance L1 from the equidistant point H0 to the fixed point P1 when viewed from the Z direction is equal to the distance L2 from the equidistant point H0 to the fixed point P2 when viewed from the Z direction.

[0055] Also, in the extension direction of the corner 2D on the Y direction side of the cover member 2 (the X direction in the example of FIG. 4), positions on the corner 2D that are a predetermined distance D1 away from the equidistant point H0 are defined as points H1 and H2. That is, in the example of FIG. 4, the position on the corner 2D that is a predetermined distance D1 away from the equidistant point H0 in the direction opposite to the X direction is point H1, and the position on the corner 2D that is a predetermined distance D1 away from the equidistant point H0 in the X direction is point H2. In this case, any position between points H1 and H2 on the corner 2D on the Y direction side of the cover member 2 is defined as the reference point H. That is, the reference point H can be said to be a position on the corner 2D between a position (point H1 in the example of FIG. 4) that is a predetermined distance D1 away from the equidistant point H0 on one side in the extension direction of the corner 2D (the direction opposite to the X direction in the example of FIG. 4) and a position (point H2 in the example of FIG. 4) that is a predetermined distance D1 away on one side in the extension direction of the corner 2D (the X direction in the example of FIG. 4). The predetermined distance D1 here may be set arbitrarily and may be, for example, 18 mm.

[0056] The reference point H may be any position between points H1 and H2 on the corner 2D on the Y direction side, but it is preferable that the reference point H is the position where the rigidity is minimum among all the positions between points H1 and H2 on the corner 2D on the Y direction side. In the example of this embodiment, the position where the rigidity is minimum among all the positions between points H1 and H2 is the equidistant point H0, and therefore the equidistant point H0 is treated as the reference point H. Note that the position where the rigidity is minimum is the position where the rigidity is minimum among all the positions between points H1 and H2, which is the (E cg ·t 2 +···+E n t n 2 ) is the position where it is minimum. However, the reference point H is not limited to the position where the stiffness is the smallest between the points H1 and H2. For example, the equidistant point H0 may be treated as the reference point H without considering the stiffness. The reference point H may be, for example, the position of the impact point where the impactor strikes in a head impact test.

[0057] (Virtual line D) Next, the virtual line D is defined. FIG. 6 is a cross-sectional view taken along the CC line in FIG. 4. The CC cross-section is a cross-section along the Y direction passing through the reference point H. As shown in FIG. 6, the virtual line D is a virtual line passing through the reference point H and the bottom member 5 and inclining at an angle θ with respect to the Z direction. That is, the virtual line D is a line passing through the reference point H and inclining at an angle θ radially inward with respect to the Z direction. The radial direction here refers to the radial direction when the central axis of the cover member 2 passing through the Z direction is set as the axial direction. Note that the central axis of the cover member 2 is an axis that passes through the central point of the cover member 2 as viewed from the Z direction and extends in the Z direction, as described above. In addition, in this embodiment, the angle θ is 30° or more and 45° or less. It can be said that the virtual line D corresponds to a direction in which a high impact is transmitted when an impact is applied to the corner portion 2D, such as in a head impact test.

[0058] 7A and 7B are schematic partial enlarged views of another example of the cover member. As shown in FIG. 7A, the cover member 2 may have a chamfered boundary between the first main surface 2A and the second main surface 2B. The end surface 2C of the chamfered cover member 2 is a surface that is bent in stages when viewed in cross section, as shown in FIG. 7A, for example. In the chamfered cover member 2, the corner formed by the first main surface 2A and the end surface 2C is the corner portion 2D, and the imaginary line passing through the reference point H on the corner portion 2D is the imaginary line D. As shown in FIG. 7B, the cover member 2 may have a R-chamfered boundary between the first main surface 2A and the second main surface 2B. The end surface 2C of the R-chamfered cover member 2 has a curved (curved) shape with a predetermined radius of curvature when viewed in cross section. In the cover member 2 that has been subjected to R-chamfering, the corner formed by the first main surface 2A and the curved end face 2C is defined as a corner 2D, and a virtual line passing through a reference point H on the corner 2D is defined as a virtual line D. Note that the end face 2C in the cover member 2 that has been subjected to R-chamfering may have a constant radius of curvature, or may have a spline shape in which the radius of curvature varies depending on the position.

[0059] (Layer structure on virtual line D) In the display device 1, the cover member 2 is disposed as the first layer, and up to the nth layer of members excluding the bottom member 5 are disposed on the virtual line D defined as above. Note that n is an integer of 2 or more. That is, in the display device 1, the cover member 2, the (n-1)th layer of members other than the cover member 2 and the bottom member 5, and the bottom member 5 are disposed side by side along the virtual line D. In the example of Figure 6, the display device 1 has a first layer, a cover member 2 having a thickness t, a second layer, a side wall member 8a having a thickness t2, a third layer, a side wall member 8b having a thickness t3, and a bottom member 5 arranged in this order along a virtual line D, where n=3 in this example.

[0060] However, the layer structure on the virtual line D shown in Fig. 6 is one example. Fig. 8 is a schematic diagram showing another example of a cross section of a display device. In the example of Fig. 8, the display device 1 has a cover member 2 as a first layer, a side wall member 8a as a second layer, a display panel 3 as a third layer, a backlight unit 4 as a fourth layer, and a bottom member 5 arranged in this order along the virtual line D, and in this example, n=4.

[0061] The number represented by n, i.e., the total number of members other than the cover member 2 and the bottom member 5 present on the imaginary line D, is preferably 2 to 20, more preferably 3 to 20, and even more preferably 4 to 10. Here, the number represented by n is preferably 2 or more, more preferably 3 or more, and even more preferably 4 or more. Moreover, the number represented by n is preferably 20 or less, and more preferably 10 or less.

[0062] (Relationship between layers on imaginary line D) The present inventors have found that, on the imaginary line D, by each layer on the imaginary line D satisfying the following formula (1), the impact resistance of the end portion of the cover member 2 can be improved and breakage can be suppressed.

[0063]

number

[0064] In formula (1), t is the thickness (mm) of the cover member 2 in the Z direction, and Q is a value calculated by the following formula (2).

[0065]

number

[0066] In formula (2), E D is the Young's modulus (GPa) of the bottom member 5, E n is the Young's modulus (GPa) of the nth layer material, t nis the thickness (mm) of the nth layer member in the Z direction through the region of the virtual line D. That is, t n can be said to be the length in the Z direction from a position on the cover member 2 side (the opposite side in the Z direction) in the Z direction through which the virtual line D passes in the nth layer member to a position on the opposite side of the cover member 2 in the Z direction through which the virtual line D passes in the nth layer member. Taking the sidewall member 8a, which is the second layer in Fig. 6, as an example, the thickness t2 of the sidewall member 8a is the length in the Z direction from a point PA1 on the sidewall member 8a that is the opposite side in the Z direction through which the virtual line D passes to a point PA2 on the sidewall member 8a that is the opposite side in the Z direction through which the virtual line D passes.

[0067] In equation (2), t D is the value calculated by the following formula (3). D can be said to be a value equivalent to the thickness of a hypothetical bottom member having only a plate portion and no ribs, which has the same moment of inertia as that of the bottom member 5 having the ribs 7.

[0068]

number

[0069] FIG. 9 is a schematic partial enlarged view of the bottom member. In formula (3), a is the thickness (mm) of the plate portion 6 of the bottom member 5 in the Z direction as shown in FIG. 9 , w2 is the width (mm) of the first rib Rb1 as shown in FIG. 9, w1 is the distance (mm) between the first rib Rb1 and the second rib Rb2 as shown in FIG. 9, As shown in FIG. 9, h is the thickness (mm) of the first rib Rb1 and the second rib Rb2 in the Z direction. The first rib Rb1 is the rib 7 of the bottom member 5 that is closest to point p on the main surface 6B of the plate portion 6 through which the virtual line D passes. The second rib Rb2 is the rib 7 that is located on a line connecting the first rib Rb1 and point p on the plate portion 6 through which the virtual line D passes, and is closest to the first rib Rb1. In other words, the second rib Rb2 is a rib that is located in the direction of a line that passes through the first rib Rb1 and point p on the plate portion 6 through which the virtual line D passes, and is perpendicular to the center line of the first rib Rb1. Moreover, the width of the first rib Rb1 refers to the width of the first rib Rb1 when viewed from the extending direction of the first rib Rb1. Moreover, the distance between the first rib Rb1 and the second rib Rb2 refers to the distance between the central axis of the first rib Rb1 and the central axis of the second rib Rb2 when viewed from the extending direction of the first rib Rb1. More specifically, the distance between the first rib Rb1 and the second rib Rb2 can be said to be the distance (the distance between the center lines) between the first rib Rb1 (rib 73) and the second rib Rb2 (rib 75) on the perpendicular line of the first rib Rb1 (rib 73) passing through point p. Moreover, when the thicknesses of the first rib Rb1 and the second rib Rb2 in the Z direction are different, h may be the average value of the thicknesses of the first rib Rb1 and the second rib Rb2 in the Z direction.

[0070] In formula (3), b is represented by the following formula (4): a, w2, w1, and h in formula (4) are the same as a, w2, w1, and h in formula (3), respectively.

[0071]

number

[0072] By satisfying the above-described formula (1), the display device 1 can improve the impact resistance of the end portion of the cover member 2. Here, the numerator of Q, (E D t D 2 ) corresponds to the rigidity of the bottom member 5, and is the denominator of Q (E cg t2+ E n t n 2) can be said to correspond to the total value of the rigidity of the members passing through the imaginary line D excluding the bottom member 5. Therefore, Q can be said to be a value indicating the ratio of the rigidity of the bottom member 5 to the total value of the rigidity of the members passing through the imaginary line D excluding the bottom member 5. Therefore, it can be said in other words that by setting the ratio of the rigidity of the bottom member 5 according to the thickness t of the cover member 2 as shown in formula (1), the end impact resistance of the cover member 2 can be improved.

[0073] Q obtained by formula (2) is preferably equal to or greater than 1.5. When the lower limit of Q is within this range, the rigidity of the base member 5 is ensured, and damage to the housing of the display device 1 can be suitably suppressed.

[0074] Also, t D is preferably 1 mm or more and 3 mm or less, more preferably 1.5 mm or more and 2.5 mm or less, and even more preferably 2 mm or more and 2.5 mm or less. In addition, if the members on the virtual line D other than the cover member 2 and the bottom member 5 are the members of the mth layer, the Young's modulus E m The thickness t of the m-th layer is preferably 1 GPa or more and 280 GPa or less, more preferably 45 GPa or more and 250 GPa or less, and even more preferably 70 GPa or more and 210 GPa or less. m The thickness t of the mth layer member is preferably 1 mm or more, more preferably 2 mm or more, and further preferably 3 mm or more. m is, for example, 50 mm or less. By setting these parameters within the above-mentioned numerical ranges, Q can be set to an appropriate value, and the end impact resistance of the cover member 2 can be improved.

[0075] In addition, the members through which the virtual line D passes, other than the cover member 2 and the bottom member 5, may also have ribs on the Z direction side. Even in this case, the thickness of the member in the Z direction (for example, the thickness t n ), without applying equation (3) or (4), t nAs explained in , the length in the Z direction from the position on the opposite side of the virtual line D to the position on the Z direction side where the virtual line D passes is used. Fig. 10 is a schematic cross-sectional view of a display device according to another example of this embodiment. That is, for example, as shown in Fig. 10, when a rib is present on the Z direction surface of the sidewall member 8a, which is the second layer member, and the rib overlaps with the virtual line D, the length in the Z direction from point PA1 where the surface of the sidewall member 8a opposite to the Z direction and the virtual line D overlap to point PA2 where the surface of the rib of the sidewall member 8a on the Z direction side overlaps with the virtual line D is the thickness t2 of the sidewall member 8a. In addition, for the bottom member 5, whether the imaginary line D passes through the rib 7 or not, t D The values ​​are calculated using equations (3) and (4).

[0076] As described above, the members on the virtual line D corresponding to the second layer to the nth layer in formula (2) are members other than the cover member 2 and the bottom member 5 that are provided in the display device 1 and overlap the virtual line D. However, in this embodiment, a member with a low Young's modulus and a thin thickness may be treated as not being present in formula (2) even if it is present on the virtual line D. In other words, a member with a low Young's modulus and a thin thickness is not treated as being present on the virtual line D. n t n 2 " may be regarded as 0 (zero). Specifically, it is preferable to regard a member having a Young's modulus of 0.5 GPa or less and a thickness in the Z direction of 1 mm or less as not existing in formula (2) even if the member exists on the virtual line D. In other words, in this embodiment, a member having a Young's modulus greater than 0.5 GPa, a thickness in the Z direction of more than 1 mm, and overlapping with the virtual line D is treated as a member on the virtual line D corresponding to the second layer to the nth layer.

[0077] In formula (2), examples of layers that are not considered to exist include an adhesive layer, a thin film layer, and a resin layer that bond the components of the display device 1 together. For example, a thin film layer such as an AR (Anti-Reflection) layer or an AFP (Anti-Finger-Print) layer may be formed on the surface of the cover member 2, or a resin film with an AR, AFP, or AG layer formed thereon may be attached. The display panel 3 may have a thin film layer such as a TFT or a transparent conductor. However, these thin film layers are extremely thin compared to, for example, the cover member 2 itself or the glass substrate (soda-lime glass, etc.) that constitutes the display panel 3. The backlight unit 4 may have a resin layer, but the Young's modulus of the resin layer is very small. For this reason, if these thin film layers and resin layers are assumed to be the "mth layer," the "E m t m 2 " may be considered to have a value of 0 (zero).

[0078] An example of the configuration of a display device having a thin film layer includes, for example, a configuration consisting of 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 sheet, a diffusion plate, a light guide plate, a reflective film, a backlight unit case, a printed wiring board, a bottom member, and a housing resin cover.

[0079] 9 is preferably 0.5 to 6 mm, and more preferably 1 to 5 mm. From the viewpoint of productivity, the value of a is preferably 0.5 mm or more, and more preferably 1 mm or more. From the viewpoint of weight reduction, a is preferably 6 mm or less, and more preferably 5 mm or less.

[0080] 9 may be 0 mm, but is preferably 1 to 20 mm, and more preferably 2 to 10 mm. Here, the value of h is preferably 1 mm or more, and more preferably 2 mm or more, from the viewpoint of obtaining the rigidity-increasing effect of the rib 7. From the viewpoint of ease of production of the bottom member 5 and from the viewpoint of preventing the size of the bottom member 5 from becoming too large, h is preferably 20 mm or less, and more preferably 10 mm or less.

[0081] 9 is preferably 1 to 40 mm, and more preferably 2 to 30 mm. Here, from the viewpoint of ease of production of the bottom member 5, w1 is preferably 1 mm or more, and more preferably 2 mm or more. From the viewpoint of effectively suppressing stress generation in the cover member 2 during a head impact test, w1 is preferably 40 mm or less, and more preferably 30 mm or less.

[0082] 9 is preferably 1 to 20 mm, and more preferably 3 to 15 mm. From the viewpoint of ease of production of the bottom member 5 and from the viewpoint of obtaining the effect of increasing the rigidity by the rib 7, w2 is preferably 1 mm or more, and more preferably 3 mm or more. From the viewpoint of obtaining the effect of reducing the weight of the display device 1, w2 is preferably 20 mm or less, and more preferably 15 mm or less.

[0083] (4. Other Examples) Next, another example of this embodiment will be described.

[0084] (An example where the intermediate part has a rib on the opposite side to the Z direction) FIG. 11 is a schematic diagram of a display device according to another example of this embodiment, and FIG. 12 is a DD cross-sectional view of FIG. 11. At least one of the members (intermediate members) other than the cover member 2 and the bottom member 5 on the virtual line D may have a rib on the surface opposite to the Z direction. In this case, in order to more appropriately improve the end impact resistance of the cover member 2, it is preferable to set the value of Q' taking into account the presence of the rib in a preferred range in addition to the value of Q. Hereinafter, as shown in FIG. 11 and FIG. 12, a case will be described as an example in which a sidewall member 8c is provided as the sidewall member 8 and the sidewall member 8c has a rib.

[0085] As shown in FIG. 12, the side wall member 8c has a base 8c1 and a rib 8c2. The base 8c1 is a frame-shaped member that surrounds the cover member 2 and the display panel 3. The rib 8c2 is a member that protrudes from the surface of the base 8c1 on the opposite side to the Z direction. In the example of FIG. 12, the ribs 8c2 extend along the Y direction and are arranged in a row along the X direction. The surface of the rib 8c2 on the opposite side to the Z direction is bonded to the second main surface 2B of the cover member 2 on the Z direction side, for example, via an adhesive layer. In addition, a resin layer 8d is filled between the ribs 8c2, but this is not limited thereto, and the space may be empty. The adhesive layer and the resin layer 8d do not have to be treated as members on the virtual line D.

[0086] Here, among the multiple ribs 8c2, the two ribs 8c2 that are the shortest distance from the reference point H are designated as the first rib 8c2A and the second rib 8c2B. It can be said that the first rib 8c2A is the rib that is the shortest distance from the reference point H among the ribs 8c2 located on the opposite side of the reference point H in the X direction, and the second rib 8c2B is the rib that is the shortest distance from the reference point H among the ribs 8c2 located on the X direction side of the reference point H. Hereinafter, the distance between the first rib 8c2A and the second rib 8c2B is designated as the distance L.

[0087] When there is a rib on the surface of the intermediate part opposite to the Z direction as in this example, it is preferable that the value of Q' obtained by the following formula (5) further satisfies the following formula (1)'. Each symbol in the formula has the same meaning as the symbol in the above formulas (1) and (2).

[0088]

number

[0089] Equation (5) is the same as equation (2): (L / 2) 3 " is multiplied. In other words, if there is a rib on the surface of the intermediate member opposite the Z direction, the cover member 2 is supported by the rib, and it is expected that there is a high possibility of damage. On the other hand, Q' is multiplied by "(L / 2) 3" to include the effect of being supported by a rib, and by making Q' satisfy equation (1)', damage to the cover member 2 can be suitably suppressed even when a rib is present. Note that by setting the value of L in equation (5) to "2", it becomes the same as equation (2). Therefore, for example, even when there is or is not a rib, equation (5) can be applied without using equation (2), and when there is no rib, the value of L can be set to "2".

[0090] In the above explanation, an example was given of a case where a rib was present on one of the members (intermediate members) other than the cover member 2 and the bottom member 5 on the virtual line D, but there are also cases where ribs are formed on the surfaces of multiple intermediate members on the opposite side in the Z direction. In this case, the value of L in formula (5) is the value of L of the intermediate member closest to the Z direction (closest to the cover member 2) among the multiple intermediate members on which a rib is formed.

[0091] In the example of Fig. 12, the base is frame-shaped because the sidewall member 8c is used as an example, but the shape of the base is not limited to the frame shape and may be any shape, for example, a flat plate-shaped member. Also, the shape, number and arrangement of the ribs are not limited to the example of Fig. 12 and may be any shape.

[0092] In addition, L is preferably 10 mm or more and 20 mm or less, more preferably 10 mm or more and 18 mm or less, and further preferably 13 mm or more and 18 mm or less. Here, L is preferably 10 mm or more, more preferably 13 mm or more, and is preferably 20 mm or less, and more preferably 18 mm or less. By setting L within the above-mentioned numerical range, Q' can be set to an appropriate value, and the impact resistance of the end portion of the cover member 2 can be improved.

[0093] (Example with one fixed point) In addition, in the above description of the embodiment, multiple fixed points P are formed, but there may be only one fixed point P. The definitions of the virtual surface R and the reference point H are different when there is one fixed point P compared to when there are multiple fixed points P, and will be described below. Fig. 13 is a schematic diagram of a display device according to another example of this embodiment.

[0094] As shown in Fig. 13, the bottom member 5 is fixed to the vehicle at one fixing point P. In the example of Fig. 13, the bottom member 5 is fixed to the bracket 9 at the one fixing point P, and thereby fixed to the vehicle via the bracket 9.

[0095] In this way, when there is one fixed point P, a virtual plane perpendicular to the side of the convex surface 9a of the bracket 9 placed at one fixed point P that contacts the bottom member 5 is defined as a distance YH and a distance YH cg 4 ) is defined as a virtual plane R. Alternatively, a virtual plane that passes through the fixed point P and is aligned with the thickness direction (Z direction) of the cover member 2 at the fixed point P and the vertical direction (Y direction) when mounted on a vehicle may be defined as the virtual plane R.

[0096] In this way, when there is one fixed point P, the position on the corner 2D on the Y direction side of the cover member 2 that is the shortest distance from the fixed point P when viewed from the Z direction is set as the equidistant point H0, as shown in Fig. 13. The method of defining the reference point H based on the equidistant point H0 is the same as in the above-mentioned embodiment, and therefore a description thereof will be omitted. In the example of Fig. 13, the position of the equidistant point H0 is set as the reference point H.

[0097] In this way, when there is one fixed point P, the definitions of the virtual plane R and the reference point H are different from those when there are multiple fixed points P, but other points may be treated the same. That is, even when there is one fixed point P, it is preferable that the display device 1 satisfies the formulas (1) to (4). Also, even when there is one fixed point P, if the intermediate member has a rib, it is preferable to use formula (5) as the value of Q' in addition to the value of Q.

[0098] (Another example of the rib 7 of the bottom member 5) In the above embodiment, the ribs 7 on the Z direction side of the bottom member 5 extend parallel to the Y direction, but the shape and arrangement of the ribs 7 are not limited to this and may be arbitrary. Other examples of the shape of the ribs 7 will be described below.

[0099] Fig. 14 is a schematic diagram showing the position of the ribs of the bottom member in this embodiment. In the above-mentioned embodiment, as shown in Fig. 9 and Fig. 14, since both the rib 72 and the rib 73 are equidistant from the point p, the first rib Rb1 may be either the rib 72 or the rib 73. However, for convenience, the rib 72 is designated as the first rib Rb1 in Fig. 9 and Fig. 14. 9 and 14, it can be seen that w2 is the width of the first rib Rb1 closest to point p. Furthermore, it can be seen that w1 is the distance between the first rib Rb1 and the second rib Rb2 (the distance between the center lines of the first rib Rb1 and the second rib Rb2).

[0100] Fig. 15 is a schematic diagram showing the positions of ribs of a bottom member in another example of this embodiment. In Fig. 15, point p (a point corresponding to reference point H) is located outside (on the left side) of rib 72, not between rib 72 and rib 73. In Fig. 15, the rib 72 closest to point p is the first rib Rb1, and the rib 73 located on the line connecting point p and the first rib Rb1 is the second rib Rb2. Then, the width w2 of the first rib Rb1 and the distance w1 between the first rib Rb1 and the second rib Rb2 are calculated. Furthermore, the distance w3 between the point p and the first rib Rb1 (the distance from the point p to the center line of the first rib Rb1) is also calculated. If the distance w1 is equal to or greater than the distance w3 (w1 ≧ w3), use the values ​​of w1 and w2 to calculate equations (3) and (4) to obtain t n Find the value of . However, when the distance w3 is greater than the distance w1 (w3>w1), the values ​​of w1 and w2 are not applied to the formulas (3) and (4), and the calculation is performed as if the rib 7 does not exist.

[0101] Fig. 16 is a schematic diagram showing the positions of ribs on a bottom member in another example of this embodiment. Fig. 16 is a schematic diagram showing ribs 7 in the horizontal direction (X direction) (ribs 75 and ribs 76) in addition to ribs 7 in the vertical direction (Y direction) (ribs 72 and ribs 73). 16, the first rib Rb1 closest to point p is the horizontal rib 75. The second rib Rb2 located on the line connecting point p and the first rib Rb1 is the rib 76 parallel to the rib 75. In this way, even if there are a plurality of ribs 7 (see, for example, FIG. 3), it is sufficient to consider only the first rib Rb1 (and the corresponding second rib Rb2) that is closest to the point p.

[0102] When there are a plurality of first ribs Rb1 that are equidistant to the point p, the relationship between the distance w1 and the distance w3 described above is considered for all of them. Then, for any one of the first ribs Rb1, if the distance w1 is equal to or greater than the distance w3 (w1 ≧ w3), the values ​​of w1 and w2 for that first rib Rb1 are used to calculate equations (3) and (4), and t n Find the value of .

[0103] Fig. 17 is a schematic diagram showing the position of ribs of a bottom member in another example of this embodiment. Fig. 17 is a schematic diagram showing a state in which the aligned ribs 7 are not parallel to each other. That is, in Fig. 17, the vertical ribs 72 and 73 are not parallel to each other, and the horizontal ribs 75 and 76 are also not parallel to each other. 17, the first rib Rb1 closest to point p is the rib 73. The second rib Rb2 located on the perpendicular line to the first rib Rb1 (rib 73) that passes through point p is not the rib 72 but the rib 75. Then, the width w2 of the first rib Rb1 (rib 73) and the distance w1 (the distance between the center lines) between the first rib Rb1 (rib 73) and the second rib Rb2 (rib 75) on the perpendicular line to the first rib Rb1 (rib 73) passing through point p are calculated.

[0104] In this way, the shape formed by the intersection of a plurality of ribs 7 does not have to be a quadrangle (rectangle) with four right-angled corners, and may be a quadrangle other than a rectangle or another polygon. Even in this case, if the above definitions are used, the values ​​of w1 and w2 required for the calculation of equations (3) and (4) can be determined.

[0105] The cross-sectional shape of the rib 7 is, for example, a rectangle or a trapezoid. Fig. 18 is a schematic diagram showing a rib 7 when the cross-sectional shape is a trapezoid. The above-mentioned w2 and w3 are values ​​at a position of height h / 2 from the surface of the plate portion 6 of the bottom member 5 (the surface on which the rib 7 is provided) as shown in Fig. 18.

[0106] (Example of multiple display panels) In the above embodiment, the display device 1 has one display panel 3, but is not limited to this and may have a plurality of display panels 3. When there are a plurality of display panels 3, values ​​based on the above-mentioned formulas (1) to (4), or further formulas (1)' and (5), may be calculated for each display panel 3.

[0107] Fig. 19 is a schematic diagram of a display device according to another example of this embodiment. Fig. 19 illustrates only a cover member 2, a display panel 3, and a bracket 9. In Fig. 19, two display panels 3 are attached to one cover member 2, and a bottom member 5 (not shown in Fig. 19) is fixed to an interior portion 10 (not shown in Fig. 19) using the bracket 9. In FIG. 19, two fixed points P1 and P2 are set. Therefore, the above-mentioned virtual surface R and the ratio Z / Z cg After determining the reference point H, the virtual line D, and the like, values ​​based on the above-mentioned formulas (1) to (5) and formula (1)' can be calculated.

[0108] In Fig. 19, a bracket 9 is disposed on the outer side of the display panel 3. As shown in Fig. 19, when there are not two fixing points on the surface of the bottom member 5 facing the display panel 3, fixing points adjacent to the outer periphery of the display panel 3 are considered. For example, for the display panel 3 (display panel 3a) on the left side in Fig. 19, four points (fixed points P1 to P4) existing outside the display panel are set as fixed points. Of these, the midpoint between fixed points P1 and P2, which are the two fixed points from the top, is set as midpoint PQ. A plane that passes through midpoint PQ and is perpendicular to the line connecting fixed points P1 and P2 is set as imaginary plane R. A point on corner 2D that is equidistant to fixed points P1 and P2 is set as equidistant point H0. On the other hand, for the display panel 3 on the right side (display panel 3b) in Fig. 19, three points (fixed points P2, P4, and P5) existing outside are set as fixed points. Of these, the midpoint between fixed points P2 and P5 is set as intermediate point PQ. And the point on corner 2D equidistant to fixed points P2 and P5 is set as equidistant point H0.

[0109] When the fixed point P is located outside the display panel 3, depending on the positional relationship, the midpoint PQ may also be located outside the display panel 3. In this case, the distance Z (the length from the upper end to the point corresponding to the midpoint PQ on the intersection line between the main surface of the display panel 3 and the imaginary surface R) becomes a negative value, and the ratio Z / Z cg Since is less than 0.5, it can be determined to be an in-dash type.

[0110] The shapes of the cover member 2 and the display panel 3 are not limited to a rectangle (see FIG. 1, etc.), and may be a quadrangle other than a rectangle or other polygons as shown in FIG. 19. Alternatively, they may be circular or the like. The cover member 2 and the display panel 3 are not limited to flat plate-like members, and may be curved plate-like members. When the cover member 2 is curved, the radius of curvature is preferably 50 to 10,000 mm, more preferably 100 to 5,000 mm, and even more preferably 200 to 3,000 mm. Here, the radius of curvature is preferably 50 mm or more, more preferably 100 mm or more, and even more preferably 200 mm or more. The radius of curvature is, for example, 10,000 mm or less, preferably 5,000 mm or less, and more preferably 3,000 mm or less.

[0111] (5. Effects) As described above, the display device 1 according to this embodiment is an in-vehicle display device in which the cover member 2, the display panel 3, and the bottom member 5 fixed to the vehicle are arranged to overlap along the Z direction (first direction). The cover member 2 has a first main surface 2A on the opposite side to the Z direction, a second main surface 2B on the Z direction side, and an end surface 2C connecting the first main surface 2A and the second main surface 2B. The bottom member 5 has a plate portion 6 and a rib 7 protruding from the main surface 6B on the Z direction side of the plate portion 6, and at least two fixing points P fixed to the vehicle are formed on the surface on the Z direction side. A virtual plane R passes through a midpoint PQ of the two fixing points P and is perpendicular to a line connecting the two fixing points P, and the length of the intersection line between the first main surface 2A of the cover member 2 and the virtual plane R is a distance YH. cg and the length from the upper end to the point corresponding to the midpoint PQ of the intersection line between the main surface of the display panel 3 and the imaginary surface R is the distance YH. cg Ratio of YH / YH cg is 0.5 or less. A position of a corner 2D formed by the first main surface 2A and the end surface 2C of the cover member 2 at an equal distance from the two fixed points P is defined as an equidistant point H0, a position on the corner 2D within a predetermined distance range from the equidistant point H0 is defined as a reference point H, a virtual line passing through the reference point H and the bottom member 5 and inclined at an angle of 30° to 45° with respect to the Z direction is defined as a virtual line D, and n is an integer of 2 or more. In this case, members up to the nth layer are arranged on the virtual line D, with the cover member 2 as the first layer, excluding the bottom member 5. The display device 1 satisfies formula (1). In formula (1), t is the thickness (mm) of the cover member 2 in the Z direction, and Q is a value determined by formula (2). In formula (2), E D is the Young's modulus (GPa) of the bottom member 5, and E cg is the Young's modulus (GPa) of the cover member 2, and E n is the Young's modulus (GPa) of the nth layer material, and t n is the thickness (mm) of the nth layer member in the Z direction of the region passing through the virtual line D, and t D is the value calculated by equation (3). In formula (3), a is the thickness (mm) of the plate portion 6 of the bottom member 5 in the Z direction, w2 is the width (mm) of the first rib Rb1 of the ribs 7 of the bottom member 5 that is closest to point p on the plate portion 6 through which the virtual line D passes, w1 is the distance (mm) between the first rib Rb1 and the second rib Rb2 that is located in the direction of a line that passes through point p on the plate portion 6 through which the virtual line D passes and is perpendicular to the center line of the first rib Rb1, h is the thickness (mm) of the rib 7 in the Z direction, and b is expressed by formula (4). The display device 1 according to this embodiment has a ratio YH / YH cg It is an in-dash type in-vehicle display device in which the difference is 0.5 or more. In such an in-dash type display device, it is required to improve the edge impact resistance and suppress damage to the cover member 2. In contrast, the display device 1 according to this embodiment is designed to satisfy the formula (1), and therefore it is possible to improve the edge impact resistance and suppress damage to the cover member 2.

[0112] The display device 1 according to this embodiment is an in-vehicle display device in which a cover member 2, a display panel 3, and a bottom member 5 fixed to a vehicle are arranged to overlap along the Z direction (first direction). The cover member 2 has a first main surface 2A on the opposite side to the Z direction, a second main surface 2B on the Z direction side, and an end surface 2C connecting the first main surface 2A and the second main surface 2B. The bottom member 5 has a plate portion 6 and a rib 7 protruding from a main surface 6B on the Z direction side of the plate portion 6, and one fixing point P fixed to the vehicle is formed on the surface on the Z direction side. A virtual plane R passes through the fixing point P and includes the thickness direction (Z direction) and vertical direction (Y direction) of the cover member 2 at the fixing point P, and the length of the intersection line between the first main surface 2A of the cover member 2 and the virtual surface R is a distance YH cg and the length from the upper end to the point corresponding to the midpoint PQ of the intersection line between the main surface of the display panel 3 and the imaginary surface R is the distance YH. cg Ratio of YH / YH cgis 0.5 or less. In addition, the position of the corner 2D formed by the first main surface 2A and the end surface 2C of the cover member 2 that is the shortest distance from the fixed point P is defined as an equidistant point H0, a position on the corner 2D that is within a predetermined distance range from the equidistant point H0 is defined as a reference point H, a virtual line that passes through the reference point H and the bottom member 5 and is inclined at an angle of 30° to 45° with respect to the Z direction is defined as a virtual line D, and n is an integer of 2 or more. In this case, the cover member 2 is defined as a first layer, and members up to the nth layer are arranged on the virtual line D, excluding the bottom member 5. The display device 1 satisfies formula (1). The display device 1 according to this embodiment is designed to satisfy the formula (1), and therefore the end impact resistance can be improved and damage to the cover member 2 can be suppressed.

[0113] At least one of the members (intermediate members) between the cover member 2 and the bottom member 5 on the virtual line D preferably has a base and a rib protruding from the surface of the base on the side opposite the Z direction. When the distance between the ribs closest to the reference point H of the intermediate members having a base and a rib that are located on the side closest to the Z direction is L, Q' based on formula (5) preferably has a value that satisfies formula (1)'. If there is a rib on the surface of the intermediate part opposite to the Z direction, the cover part 2 is supported by the rib, and it is expected that there is a high risk of damage. In response to this, by designing Q to be the value of formula (5) and to satisfy formula (1), and by incorporating the effect of being supported by a rib, damage to the cover part 2 can be suitably suppressed even when the intermediate part has a rib.

[0114] The bottom member 5 is preferably fixed to the vehicle using a bracket 9. By being fixed to the vehicle via the bracket 9, the display device 1 can be appropriately fixed to the vehicle.

[0115] Q calculated by formula (2) is preferably 1.5 or more. Q' calculated by formula (5) is preferably 1.5 or more. It is also preferable that both Q and Q' are 1.5 or more. When Q and Q' are in this range, the rigidity of the bottom member 5 is ensured, and damage to the housing of the display device 1 can be suitably suppressed.

[0116] The cover member 2 is preferably made of tempered glass having a compressive stress layer having a thickness of 10 μm or more, the thickness t of the cover member 2 is 0.5 mm or more and 2.5 mm or less, and the Young's modulus E cg It is preferable that the Young's modulus of the display panel 3 is 2 GPa or more and 90 GPa or less, and the Young's modulus of the bottom member 5 is 40 GPa or more and 250 GPa or less. By keeping the Young's modulus of each part within this range, damage to the cover member 2 can be suppressed.

[0117] In the head impact test of the display device 1, in which an impactor is collided with a reference point H of the cover member 2 through which the virtual line D passes, so that the impact energy is 152 J, the deceleration of the impactor is preferably 50 G or more. If the deceleration is within this range, there is a high risk of damage to the cover member 2, but by designing the display device 1 to satisfy formula (1), damage to the cover member 2 can be appropriately suppressed. The deceleration is not particularly limited, but is, for example, 150 G or less. The head impact test conditions are the same as those used in the simulation of impacting an impactor in the embodiment described later. EXAMPLES

[0118] (Example) Next, examples will be described. Note that the embodiment may be modified as long as the effects of the invention are achieved.

[0119] In the examples, a simulation model of the display device 1 was generated, and a simulation was performed in which an impact was applied to the simulation model of the display device 1 at a reference point H, thereby simulating a head impact test. The models of each example are described below. Table 1 is a table for explaining each example.

[0120] [Table 1]

[0121] (Example 1) Fig. 20 is a schematic front view of a display device in an example. In Example 1, a simulation model of a display device 1 as shown in Fig. 20 was prepared. As shown in Fig. 20, the model of the display device 1 had a cover member 2, a display panel 3, a sidewall member 8c having a rib on the opposite side to the Z direction, and a bottom member 5. That is, the model of the display device 1 adopted the structure described in Figs. 11 and 12.

[0122] In the model of the display device 1 of Example 1, the size of the cover member 2 is 250 mm in the X direction, 150 mm in the Y direction, the thickness t in the Z direction is 0.7 mm, and the Young's modulus E cg The stiffness of the cover member 2 is Ecg t 2 The values ​​were calculated as shown in Table 1. In the model of the display device 1, the size of the display panel 3 was 170 mm in the X direction, 125 mm in the Y direction, and the thickness in the Z direction was 1.1 mm. In addition, the distance A1 between the Y-direction end of the cover member 2 and the Y-direction end of the display panel 3 is 12 mm, and the distance A2 between the X-direction end of the cover member 2 and the X-direction end of the display panel 3 is 40 mm. In the model of the display device 1, the size of the bottom member 5 is the same as that of the cover member 2 in the X and Y directions, the thickness of the plate portion 6 is 2 mm, and the value t corresponding to the thickness when the rib 7 is taken into consideration is D The shape of the rib 7 was set so that the Young's modulus E D The stiffness of the bottom member 5 is ED t D 2 The values ​​were calculated as shown in Table 1. The thickness of the base 8c1 of the sidewall member 8c in the Z direction was 1.5 mm, and half the distance L between the ribs 8c2 closest to the reference point H (L / 2) was 13 mm. The Young's modulus of the sidewall member 8c was 2.2 GPa. The rigidity of the sidewall member 8c was calculated in the same manner as the cover member 2, and was set to the value shown in Table 1. In the model of the display device 1, the surface of the bottom member 5 in the Z direction has a ratio YH / YH cg The bracket 9 was arranged by setting the fixing point P so that the angle .gtoreq.0.5. The position of each fixing point in the X direction was the center position between the end of the cover member 2 in the X direction (or the opposite side to the X direction) and the end of the display panel 3 in the X direction (or the opposite side to the X direction). The reference point H was set at a position on the corner 2D of the cover member 2 on the Y direction side, the distance from the fixed points P1 and P2 being equal. In addition, the virtual line D was set to pass through the reference point H and to be inclined at 30° with respect to the Z direction. In Example 1, the first layer of the members other than the bottom member 5 passing through the imaginary line D is the cover member 2, and the second layer is the sidewall member 8c, so n=2. The values ​​of Q in the model of Example 1 are shown in Table 1 and satisfy formula (1).

[0123] (Example 2 to Example 18) In Examples 2 to 18, the parameters shown in Table 1 were changed from those in Example 1 to generate models.

[0124] (evaluation) A simulation was performed in which an impactor was collided with the reference point H of the model generated for each example under the following conditions. Impactor impact energy: 152(J) Impactor weight: 6.8 (kg) Impactor diameter: 165 (mm) Impactor impact angle (the inclination angle of the impactor's impact direction relative to the Z direction): 30 (°)

[0125] (Evaluation Results) The analysis results of the stress generated in the cover member 2 when the impactor collided with the reference point H were obtained by simulation. If the maximum stress generated in the cover member 2 was less than a predetermined threshold, the result was judged as ◯ (pass), and if it was equal to or greater than the threshold, the result was judged as × (fail). In addition, as shown in Table 1, the simulation also obtained the analysis results of the deceleration of the impactor.

[0126] FIG. 21 is a graph showing the Q value and the evaluation results for each example. The horizontal axis of FIG. 21 is the thickness of the cover member 2, the vertical axis is the Q value, and each plot in FIG. 21 shows the results of each example. Line α1 is the boundary line that satisfies formula (1) (the line connecting the plots of the Q value and the thickness of the cover member 2 when the left and right sides of formula (1) are the same value). In other words, the plots above line L1 satisfy formula (1), and the plots below line L1 do not satisfy formula (1). The plots of Examples 1, 3, 5, 7, 8, 11, 13, 14, and 18, which are working examples, are represented by circles (◯) in Fig. 21, and it can be seen that Q satisfies formula (1). In the working examples, the judgment is ◯, that is, good, and it can be seen that damage to the cover member 2 can be suppressed. On the other hand, the plots of Examples 2, 4, 6, 9, 10, 12, and 15 to 17, which are comparative examples, are represented by a cross (x) in Fig. 21, which indicates that Q does not satisfy formula (1). In the comparative examples, the judgment is x, that is, poor, and it is understood that damage to the cover member 2 cannot be suppressed.

[0127] Although the embodiment of the present invention has been described above, the embodiment is not limited to the contents of this embodiment. The above-mentioned components include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-mentioned components can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the gist of the above-mentioned embodiment.

[0128] This application is based on a Japanese patent application (Patent Application No. 2021-180542) filed on November 4, 2021, the contents of which are incorporated herein by reference. [Explanation of symbols]

[0129] 1 Display device 2 Cover material 2A 1st main surface 2B 2nd main surface 2C end face 2D corner 3 Display Panel 4 Backlight Unit 5 Bottom member 6 Plate part 7. Ribs 8 Side wall member 9 Bracket 10 Interior D Virtual line H reference point H0 equidistant point P fixed point

Claims

1. A display device for an in-dash or on-dash vehicle in which a cover member, a display panel, and a bottom member fixed to a vehicle are laminated in this order, In a thickness direction of the cover member, when a direction from the cover member toward the bottom member is defined as a first direction, the cover member has a first main surface opposite to the first direction, a second main surface on the first direction side, an end surface connecting the first main surface and the second main surface, and a corner portion formed by the first main surface and the end surface, the bottom member has a plate portion and a rib protruding from a main surface of the plate portion on the first direction side, and at least two fixing points that are fixed to the vehicle are formed on the main surface on the first direction side; a position on the corner of the cover member that is equidistant from the two fixed points is defined as an equidistant point, a position on the corner that is within a predetermined distance range from the equidistant point is defined as a reference point, a virtual line that passes through the reference point and the bottom member and is inclined at an angle of 30° to 45° with respect to the first direction is defined as a virtual line D, and n is an integer of 2 or more. On the virtual line D, the cover member is defined as a first layer, and members up to the nth layer, excluding the bottom member, are arranged; Satisfying the following formula (1), A display device, wherein the material of the bottom member is a metal, an alloy, a resin, or a laminate of a resin layer and a metal layer. [0010] In formula (1), t is the thickness (mm) of the cover member in the first direction, Q is a value calculated by the following formula (2). [0025] In formula (2), E Ｄ is the Young's modulus of the base member (GPa), E ｃｇ is the Young's modulus (GPa) of the cover member, E ｎ is the Young's modulus (GPa) of the nth layer member, t ｎ is the thickness (mm) of the nth layer member in the first direction in a region passing through the virtual line D, t Ｄ is a value calculated by the following formula (3). [0030] In formula (3), a is the thickness (mm) of the plate portion of the bottom member in the first direction, W ２ is the width (mm) of the first rib of the bottom member that is closest to the point on the plate portion through which the virtual line D passes, W １ is the distance (mm) between the first rib and the second rib located in the direction of a line passing through a point on the plate portion through which the virtual line D passes and perpendicular to the center line of the first rib, h is the thickness (mm) of the first rib and the second rib in the first direction, b is expressed by the following equation (4). [0045] a and w in formula (4) １ , W ２ and h are the same as in formula (3).

2. A display device for an in-dash or on-dash vehicle in which a cover member, a display panel, and a bottom member fixed to a vehicle are laminated in this order, In a thickness direction of the cover member, when a direction from the cover member toward the bottom member is defined as a first direction, the cover member has a first main surface opposite to the first direction, a second main surface on the first direction side, an end surface connecting the first main surface and the second main surface, and a corner portion formed by the first main surface and the end surface, the bottom member has a plate portion and a rib protruding from a main surface of the plate portion on the first direction side, and a fixing point that is fixed to the vehicle is formed on the main surface on the first direction side, a virtual line D that passes through the reference point and the bottom member and is inclined at an angle of 30° to 45° with respect to the first direction, and n is an integer of 2 or more. In this case, when the cover member is regarded as a first layer and the bottom member is excluded, members up to the nth layer are arranged on the virtual line D. Satisfying the following formula (1), A display device, wherein the material of the bottom member is a metal, an alloy, a resin, or a laminate of a resin layer and a metal layer. [0050] In formula (1), t is the thickness (mm) of the cover member in the first direction, Q is a value calculated by the following formula (2). [006] In formula (2), E Ｄ is the Young's modulus of the base member (GPa), E ｃｇ is the Young's modulus (GPa) of the cover member, E ｎ is the Young's modulus (GPa) of the nth layer member, t ｎ is the thickness (mm) of the nth layer member in the first direction in a region passing through the virtual line D, t Ｄ is a value calculated by the following formula (3). [0070] In formula (3), a is the thickness (mm) of the plate portion of the bottom member in the first direction, W ２ is the width (mm) of the first rib of the bottom member that is closest to the point on the plate portion through which the virtual line D passes, W １ is the distance (mm) between the first rib and the second rib located in the direction of a line passing through a point on the plate portion through which the virtual line D passes and perpendicular to the center line of the first rib, h is the thickness (mm) of the first rib and the second rib in the first direction, b is expressed by the following equation (4). [0080] a and w in formula (4) １ , W ２ and h are the same as in formula (3).

3. At least one of the members between the cover member and the bottom member on the virtual line D has a base and a rib protruding from a surface of the base on a side opposite to the first direction, A display device as described in claim 1 or claim 2, wherein, when the distance between the ribs closest to the reference point of the component that is the component closest to the reference point in the direction opposite to the first direction among the components having the base and the rib protruding from the base is L, the value of Q' calculated by the following equation (5) further satisfies the following equation (1)'. [0097]

4. 4. The display device according to claim 3, wherein Q' calculated in the formula (5) is 1.5 or more.

5. The display device according to claim 1 or 2, wherein the bottom member is fixed to the vehicle by using a bracket.

6. 3. The display device according to claim 1, wherein Q calculated in the formula (2) is 1.5 or more.

7. The cover member is made of reinforced glass having a compressive stress layer having a thickness of 10 μm or more, The thickness of the cover member is 0.5 mm or more and 2.5 mm or less, The Young's modulus of the cover member is 60 GPa or more and 90 GPa or less, The Young's modulus of the display panel is 2 GPa or more and 90 GPa or less, The display device according to claim 1 or 2, wherein the Young's modulus of the base member is 40 GPa or more and 250 GPa or less.

8. 3. The display device according to claim 1, wherein in a head impact test in which an impactor having a diameter of 165 mm and a mass of 6.8 kg is collided with a reference point of the cover member through which the virtual line D passes, so that the impact energy is 152 J, the deceleration of the impactor is 50 G or more and 150 G or less.

9. The display device according to claim 1 or 2, wherein the base member is fixed to a dashboard of the vehicle.

10. 3. The display device according to claim 1, wherein the cover member is a chemically strengthened glass having a thickness of 0.5 mm to 2.5 mm, the compressive stress layer has a thickness of 10 μm to 180 μm, and the surface compressive stress is 500 MPa to 1200 MPa.

11. The display device according to claim 1 , wherein the cover member has a curved shape.

Images