Head-up display device

Abstract

To provide a head-up display device that is able to improve assemblability.SOLUTION: A head-up display device includes: a light source; a liquid crystal display panel 12A which receives illumination light from the light source and emits display light L; and a light box 70 which holds the liquid crystal display panel 12A in a state of being inclined with respect to a Z direction. The light box 70 includes; first abutting portions 73A, 73B which come into contact with the liquid crystal display panel 12A; and first elastic portions 71A, 71B, each having a contact surface 71s which presses the liquid crystal display panel 12A so as to press the liquid crystal display panel 12A against the first abutting portion 73A, 73B. The first elastic portions 71A, 71B are each located on an end side, close to the light source 11a, of the liquid crystal display panel 12A inclined with respect to a light traveling direction of the display light L. The contact surface 71s is formed so as to be exposed in the light traveling direction as a single body of the light box 70.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a head-up display device. [Background technology]

[0002] The head-up display device described in Patent Document 1 includes an LED (Light Emitting Diode), a TFT (Thin Film Transistor) type liquid crystal panel that receives light from the LED and emits display light, a backlight case (light box) that houses the LED and in which the liquid crystal panel is installed, and a liquid crystal cover that is attached to the light box and sandwiches the liquid crystal panel between the light box and the LED (see, for example, Figure 1C of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 097638 Summary of the Invention [Problem to be solved by the invention]

[0004] The configuration described in Patent Document 1 leaves room for improvement in the ease of assembly of the head-up display device.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a head-up display device that can be easily assembled. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to the present disclosure includes: A head-up display device that displays a projection image by projecting display light onto a projection target, A light source and a display panel that receives illumination light from the light source and emits the display light; a holder that holds the display panel in a state inclined with respect to the light traveling direction of the display light, The holder is a first abutment portion that contacts the display panel; a first elastic portion having a contact surface that presses the display panel so as to press the display panel against the first abutment portion, the first elastic portion is located at an end of the display panel that is inclined with respect to the light traveling direction and that is closer to the light source; The contact surface of the holder alone is formed so as to be exposed in the light traveling direction. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to improve assembly efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a head-up display device according to a first embodiment of the present disclosure. [Figure 2] 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present disclosure. [Figure 3] 1 is an exploded perspective view of a light box and a display panel unit according to a first embodiment of the present disclosure. [Figure 4] 1 is an exploded perspective view of a light box to which a display panel unit according to a first embodiment of the present disclosure is attached, and a cover. [Figure 5] 1 is a front view of a display device according to a first embodiment of the present disclosure. [Figure 6] 1 is a side view of a display device according to a first embodiment of the present disclosure. [Figure 7] FIG. 2 is a perspective view of a light box in the process of assembling a liquid crystal display panel according to the first embodiment of the present disclosure. [Figure 8] 1 is a perspective view of a display device according to a first embodiment of the present disclosure. [Figure 9]FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] FIG. 10 is a perspective view of a display device according to a second embodiment of the present disclosure. [Figure 11] FIG. 10 is a perspective view of a light box equipped with a display panel according to a second embodiment of the present disclosure. [Figure 12] FIG. 10 is an enlarged perspective view of a portion of a light box according to a second embodiment of the present disclosure. [Figure 13] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 11. [Figure 14] FIG. 10 is an enlarged perspective view of a portion of a light box to which a display panel according to a modified example of the second embodiment of the present disclosure is attached. [Figure 15] 15 is a cross-sectional view taken along line XV-XV in FIG. 14. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A head-up display device according to a first embodiment of the present disclosure will be described with reference to the drawings. As shown in Fig. 1, the head-up display device 100 is installed in the dashboard of a vehicle 200. The head-up display device 100 emits display light L that displays an image toward a windshield 201, which is the front glass of the vehicle 200. The display light L is reflected by the windshield 201 and reaches a viewer 1 (mainly the driver of the vehicle 200). As a result, a virtual image V is displayed on a virtual image display surface K that is parallel to the road surface.

[0010] The head-up display device 100 includes a display device 10, a folding mirror 20, a concave mirror 30, and a housing 60.

[0011] The housing 60 is made of non-transparent resin or metal and is a hollow, approximately rectangular parallelepiped. An opening is formed in the housing 60 at a position facing the windshield 201. The housing 60 has a window 62 that closes the opening. The window 62 is made of a translucent resin such as acrylic, through which the display light L passes. The display device 10, the concave mirror 30, and the folding mirror 20 are housed inside the housing 60.

[0012] The folding mirror 20 and the concave mirror 30 constitute an optical relay that guides the display light L from the display device 10 to the windshield 201. The folding mirror 20 reflects the display light L from the display device 10 toward the concave mirror 30. The folding mirror 20 is a flat mirror. Note that the folding mirror 20 is not limited to a flat mirror, and may be a concave mirror. The concave mirror 30 reflects the display light L from the display device 10 toward the windshield 201 while expanding the light.

[0013] Next, a specific configuration of the display device 10 will be described. As shown in FIG. 2, the display device 10 includes a light source substrate 11 having a plurality of light sources 11a, a display panel unit 12, an illumination optical system 18, a light box 70, and a cover 80.

[0014] The illumination optical system 18 adjusts the illumination light IL from the light source 11a. Adjusting the illumination light IL means collimating the illumination light IL, diffusing, scattering, or converging the illumination light IL. The illumination optical system 18 includes a first lens 13, a second lens 14, and a diffuser plate 15. In the following description, the traveling direction of illumination light IL emitted from light source 11a is defined as the Z direction, and directions perpendicular to the Z direction and perpendicular to each other are defined as the X and Y directions. In this example, the X direction is the longitudinal direction of liquid crystal display panel 12A, and the Y direction is the lateral direction of liquid crystal display panel 12A.

[0015] The first lens 13, the second lens 14, and the diffusion plate 15 are arranged in the Z direction so as to be parallel to one another.

[0016] The light sources 11a are mounted on the surface of the light source substrate 11 facing the first lens 13. The light sources 11a are LEDs. The first lens 13 is a condenser lens formed into a plate shape from a light-transmitting resin or glass, and has a function of approximately collimating the rays of the illumination light IL emitted from each light source 11a in the Z direction. The first lens 13 has a plurality of convex lens portions 13a arranged in the X and Y directions. Each of the convex lens portions 13a is formed in a biconvex lens shape. The plurality of convex lens portions 13a are arranged in a matrix in one-to-one correspondence with the plurality of light sources 11a.

[0017] The second lens 14 is a light distribution lens that expands the illumination light IL that has been approximately collimated by the first lens 13 to fit the display area of ​​the display panel unit 12, and is formed in a plate shape from translucent resin or glass.

[0018] In order to suppress unevenness in light intensity, the diffusion plate 15 diffuses the illumination light IL from the second lens 14 and then radiates the light toward the display panel unit 12. The diffusion plate 15 faces the light exit surface of the second lens 14.

[0019] 3, the display panel unit 12 includes a TFT-type liquid crystal display panel 12A, a relay substrate 12B, and a flexible flat cable 12F. The relay substrate 12B is connected to the liquid crystal display panel 12A via the flexible flat cable 12F. The relay substrate 12B is connected to a control board (not shown) via the flexible flat cable (not shown). The liquid crystal display panel 12A receives illumination light IL and emits display light L under the control of the control board (not shown). The liquid crystal display panel 12A is oriented non-perpendicular to the traveling direction of the illumination light IL (Z direction) and non-parallel to the diffuser plate 15.

[0020] The light box 70 surrounds the first lens 13, the second lens 14, and the diffusion plate 15, and holds the first lens 13, the second lens 14, and the diffusion plate 15 within the internal space of the light box 70. The light box 70 is made of a light-blocking resin or metal.

[0021] As shown in Figures 3 and 4, the light box 70 comprises a tubular portion 75, a plurality of first elastic portions 71A, 71B, a second elastic portion 72, a plurality of first abutment portions 73A, 73B, a plurality of second abutment portions 74A, 74B, and a plurality of cover engagement portions 76.

[0022] The tube portion 75 has a rectangular tube shape that penetrates in the Z direction and is formed to surround the first lens 13, the second lens 14, and the diffusion plate 15. The upper end surface of the tube portion 75 is a panel mounting surface 75a on which the outer periphery of the liquid crystal display panel 12A is mounted. The panel mounting surface 75a is inclined with respect to the Z direction, and more specifically, the height in the Z direction decreases from the first abutment portions 73A, 73B toward the first elastic portions 71A, 71B in the Y direction; in other words, it is formed to approach the light source 11a.

[0023] The first elastic portions 71A and 71B, the second elastic portion 72, the first abutment portions 73A and 73B, and the second abutment portions 74A and 74B function to hold the liquid crystal display panel 12A from the periphery. The first elastic portions 71A and 71B and the first abutment portions 73A and 73B are located on both sides of the liquid crystal display panel 12A in the Y direction, respectively, and are formed to hold the liquid crystal display panel 12A in the Y direction. The first elastic portions 71A and 71B are formed to press the side surfaces on the lower end side of the liquid crystal display panel 12A. The two first elastic portions 71A and 71B are located apart in the X direction and are located at both ends of the liquid crystal display panel 12A in the X direction. The first elastic portions 71A and 71B are located outside the cylindrical portion 75, extend in the Z direction, and are formed as leaf springs that are elastically deformable in the Y direction.

[0024] As shown enlarged in the lower part of FIG. 6, the first elastic portions 71A and 71B have contact surfaces 71s located at their distal ends. When viewed from the X direction, the first elastic portions 71A and 71B form a substantially right-angled triangle, and the inclined surface of this substantially right-angled triangle is the contact surface 71s. The contact surface 71s contacts the lower side of the liquid crystal display panel 12A, in this example, by surface contact. The contact surface 71s faces diagonally upward toward the first abutment portions 73A and 73B and is oriented perpendicular to the surface of the liquid crystal display panel 12A. The contact surface 71s is exposed upward in the Z direction so that the end of the liquid crystal display panel 12A can be inserted. In other words, no other parts of the light box 70 are present above the contact surface 71s. Therefore, the first elastic portions 71A and 71B do not have any part that restricts the upward movement of the liquid crystal display panel 12A.

[0025] 3 and 4, the first abutment portions 73A and 73B are convex and come into surface contact with the side surface of the upper end of the liquid crystal display panel 12A in this example. The two first abutment portions 73A and 73B are located at both upper corners of the panel mounting surface 75a and are positioned so as to face the first elastic portions 71A and 71B in the Y direction, respectively.

[0026] The second elastic portion 72 and the second abutment portions 74A and 74B are positioned on both sides of the liquid crystal display panel 12A in the X direction, respectively, and are formed to hold the liquid crystal display panel 12A in the X direction. The second elastic portion 72 is formed in a hook shape so as to press against a side surface of the liquid crystal display panel 12A extending in the YZ plane (more precisely, the upper edge portion of this side surface). The second elastic portion 72 is formed to face both the side surface and the top surface of the liquid crystal display panel 12A. The second elastic portion 72 is located outside the tubular portion 75, midway between the first elastic portion 71B and the first abutment portion 73B in the Y and Z directions. The second elastic portion 72 is formed as a leaf spring that extends in the Z direction and is elastically deformable in the X direction. 5, the second elastic portion 72 has a claw portion 72t that hooks onto an edge portion of the liquid crystal display panel 12A. The claw portion 72t is formed to protrude from a part of the upper surface of the liquid crystal display panel 12A. Therefore, the claw portion 72t holds the liquid crystal display panel 12A so that it does not separate from the light box 70 in the Z direction.

[0027] The second abutment portions 74A and 74B are located on opposite sides of the second elastic portion 72 in the X direction, sandwiching the liquid crystal display panel 12A therebetween. The two second abutment portions 74A and 74B are located on both sides of the second elastic portion 72 in the Y direction. The second abutment portions 74A and 74B are formed to face both the side and top surfaces of the liquid crystal display panel 12A. More specifically, the second abutment portions 74A and 74B extend in the Z direction and are bent so that their tips come into contact with the edges of the liquid crystal display panel 12A. Therefore, the tips of the second abutment portions 74A and 74B hold the liquid crystal display panel 12A so that it does not move away from the light box 70 in the Z direction.

[0028] The plurality of cover engagement portions 76 are located on the outer surface of the tubular portion 75, and engage with later-described engagement claw portions 86 of the cover 80. The cover engagement portions 76 are tubular and extend in the Z direction.

[0029] 4 and 8, the cover 80 covers the outer periphery of the liquid crystal display panel 12A and is attached to the light box 70. The cover 80 is made of a light-blocking resin or metal. The cover 80 includes a frame portion 85, sidewall portions 87, a plurality of locking claw portions 86, an interconnection board holding portion 82, and a third elastic portion 83. The frame portion 85 is frame-shaped so as to cover the bezel on the outer periphery of the liquid crystal display panel 12A. The frame portion 85 has a light transmission hole 85h through which display light L passes. The light transmission hole 85h has a rectangular shape that is elongated in the X direction. The sidewall portions 87 are erected on the outer periphery of the frame portion 85 and face the outer surface of the tube portion 75.

[0030] The multiple locking claws 86 are provided on the side wall 87 and extend downward in the Z direction. When inserted into the cover locking portions 76, the locking claws 86 are hooked onto the lower end surfaces of the cover locking portions 76. This secures the cover 80 to the light box 70. The relay board holding portion 82 is located at the lower end of the frame portion 85, extends upward, and is formed on the XZ plane. The relay board holding portion 82 holds the relay board 12B.

[0031] 8 and 9, the third elastic portion 83 is located in the frame portion 85 and presses the liquid crystal display panel 12A toward the light box 70 (more precisely, toward the panel installation surface 75a). The third elastic portion 83 is formed to be elastically deformable in the direction perpendicular to the surface of the liquid crystal display panel 12A, which is the direction along the Z direction. The third elastic portion 83 is formed in a substantially L-shaped rod shape, and the bent tip of the third elastic portion 83 is in contact with the upper surface of the liquid crystal display panel 12A (particularly, the upper surface of the bezel). The third elastic portion 83 holds the liquid crystal display panel 12A in the Z direction.

[0032] Next, we will explain how to assemble the display device 10. This assembly work is performed by a person or a robot. First, the illumination optical system 18 (first lens 13, etc.) is housed in the light box 70. Then, the liquid crystal display panel 12A is attached to the light box 70. Specifically, first, as shown in FIG. 7 , the first elastic portion 71A is spread outward in the X direction, and the first end E1 of the liquid crystal display panel 12A is positioned within the second abutment portions 74A and 74B. The first end E1 is an end extending in the short-side direction of the liquid crystal display panel 12A. At this time, the second end E2 of the liquid crystal display panel 12A, which is opposite the first end E1, is positioned above the first abutment portion 73B, the first elastic portion 71B, and the second elastic portion 72. The second end E2 of the liquid crystal display panel 12A is pushed in the Z direction around the first end E1 so as to approach the first abutment portion 73B, the first elastic portion 71B, and the second elastic portion 72. As the LCD panel 12A is pressed, the third end E3 of the LCD panel 12A comes into contact with the contact surface 71s of the first elastic portion 71A, pushing the first elastic portion 71A outward in the X direction and contacting the upper ends of the first elastic portion 71B and the second elastic portion 72. The third end E3 is the lower end of the LCD panel 12A extending in the longitudinal direction. As the pressing continues, the first elastic portion 71B retracts outward in the Y direction due to contact between the third end E3 and the contact surface 71s of the first elastic portion 71B, while the second elastic portion 72 retracts outward in the X direction due to contact with the second end E2. At this time, the third end E3 does not come into contact with any component of the light box 70 before contacting the contact surfaces 71s of the first elastic portions 71A and 71B, and does not climb over any protrusions. This allows the LCD panel 12A to be smoothly attached to the light box 70. 4, the liquid crystal display panel 12A is placed on the panel mounting surface 75a and held in the X and Y directions by the first elastic portions 71A and 71B, the second elastic portion 72, the first abutment portions 73A and 73B, and the second abutment portions 74A and 74B. In this held state, the first elastic portions 71A and 71B press the liquid crystal display panel 12A against the first abutment portions 73A and 73B, and the second elastic portion 72 presses the display panel 12A against the second abutment portions 74A and 74B. At this point, the liquid crystal display panel 12A is held in the light box 70 so that it cannot fall off.

[0033] Next, the cover 80 is attached to the light box 70. Specifically, the locking claws 86 of the cover 80 are locked to the cover locked portions 76 of the light box 70. This causes the third elastic portions 83 of the cover 80 to press the liquid crystal display panel 12A against the panel installation surface 75a. With the above, the assembly of the display device 10 is completed.

[0034] (effect) According to the first embodiment described above, the following effects are achieved. (1) A head-up display device 100 displays a virtual image V as a projection image by projecting display light L onto a windshield 201, which is an example of a projection target member. The head-up display device 100 includes a light source 11a, a liquid crystal display panel 12A, which is an example of a display panel that receives illumination light IL from the light source 11a and emits display light L, and a light box 70, which is an example of a holder that holds the liquid crystal display panel 12A in a state inclined with respect to the light traveling direction (Z direction) of the display light L. The light box 70 includes first abutment portions 73A and 73B that contact side surfaces of the liquid crystal display panel 12A, and first elastic portions 71A and 71B that have contact surfaces 71s that press the liquid crystal display panel 12A so as to press the liquid crystal display panel 12A against the first abutment portions 73A and 73B. The first elastic portions 71A and 71B are located on end sides (lower end sides) of the liquid crystal display panel 12A that are inclined with respect to the light traveling direction of the display light L and are closer to the light source 11a. The contact surface 71s is formed so that the light box 70 alone is exposed in the light traveling direction so that no other components of the light box 70 are present in the light traveling direction of the display light L on the contact surface 71s. The first elastic portions 71A, 71B are formed without protrusions so that the liquid crystal display panel 12A does not interfere with components other than the contact surface 71s when the liquid crystal display panel 12A is mounted between the first abutment portions 73A, 73B and the first elastic portions 71A, 71B. According to this configuration, when the liquid crystal display panel 12A is assembled between the first elastic portions 71A, 71B and the first abutment portions 73A, 73B, it does not interfere with any members other than the contact surfaces 71s of the first elastic portions 71A, 71B, thereby improving the ease of assembly of the head-up display device 100. Furthermore, the light box 70 is configured to be able to hold the liquid crystal display panel 12A between the first elastic portions 71A, 71B and the first abutment portions 73A, 73B by itself, which makes it possible to prevent the liquid crystal display panel 12A from falling off from the light box 70 when assembling the head-up display device 100. Furthermore, adhesive materials such as double-sided tape for fixing the liquid crystal display panel 12A to the light box 70 are not required.

[0035] (3) The head-up display device 100 includes second abutment portions 74A and 74B that contact the side surfaces of the liquid crystal display panel 12A, and second elastic portions 72 that press the liquid crystal display panel 12A against the second abutment portions 74A and 74B. The second elastic portions 72 and the second abutment portions 74A and 74B are shaped to face the side surfaces and the top surface of the liquid crystal display panel 12A, respectively, and are aligned in a second direction (X direction) that is perpendicular to the first direction (Y direction) in which the first elastic portions 71A and 71B and the first abutment portions 73A and 73B are aligned. With this configuration, the light box 70 can hold the liquid crystal display panel 12A in both the X and Y directions.

[0036] (4) The head-up display device 100 includes a cover 80 that is attached to the light box 70 and covers the liquid crystal display panel 12A. The cover 80 includes a third elastic portion 83 that presses the liquid crystal display panel 12A against the light box 70 when the cover 80 is attached to the light box 70. The liquid crystal display panel 12A is held by the light box 70 alone by the first elastic portions 71A, 71B and the first abutment portions 73A, 73B. According to this configuration, the cover 80 can hold the liquid crystal display panel 12A between itself and the light box 70 in the Z direction via the third elastic portion 83. The cover 80 can be attached to the light box 70 while the light box 70 alone holds the liquid crystal display panel 12A. This prevents the liquid crystal display panel 12A from falling off the light box 70 before the cover 80 is attached, improving the ease of assembly of the head-up display device 100.

[0037] (5) When the liquid crystal display panel 12A is attached to the light box 70, the first elastic portions 71A and 71B are formed so as to be elastically deformable in a direction away from the first abutment portions 73A and 73B upon contact with the liquid crystal display panel 12A. According to this configuration, the liquid crystal display panel 12A can be easily held between the first abutment portions 73A, 73B and the first elastic portions 71A, 71B.

[0038] (Second embodiment) A head-up display device according to a second embodiment of the present disclosure will be described with reference to Figures 10 to 13. This embodiment differs from the first embodiment in that the first elastic portion is configured to be able to hold the liquid crystal display panel not only in the Y direction but also in the Z direction. The following description will focus on the differences from the first embodiment.

[0039] As shown in FIG. 10, the display device 10a includes a light box 70a and a cover 80a. The relay board holding portion 82a of the cover 80a extends from the lower portion of the frame portion 85 in a direction along the liquid crystal display panel 12A. In the first embodiment, as shown in FIG. 4, the cover latching portion 76 is provided on the light box 70, and the latching claw portion 86 is provided on the cover 80. In this embodiment, the latching portion 86a is provided on the cover 80a, and the latching claw portion 76a is provided on the light box 70a. The latching portions 86a are provided on both ends in the Y direction on both outer surfaces of the side wall portion 87 extending in the Y direction. Each latching claw portion 76a is formed to latch onto the corresponding latching portion 86a. The frame portion 85 of the cover 80a is not provided with the third elastic portion 83 (see FIGS. 8 and 9) of the first embodiment.

[0040] As shown in FIG. 11, the light box 70a includes a plurality of first elastic portions 41, 42, a plurality of holding portions 172, 174, and a plurality of first abutment portions 173A, 173B. The two holding portions 172, 174 are provided in place of the second elastic portion 72 and the second abutment portions 74A, 74B of the first embodiment. The two holding portions 172, 174 are located on both sides of the liquid crystal display panel 12A in the X direction and are plate-shaped extending on the YZ plane. The two holding portions 172, 174 are rectangular plate-shaped and fit along the side surfaces of the liquid crystal display panel 12A that face them. The opposing inner surfaces of the two holding portions 172, 174 are inclined so as to move away from each other as they advance in the light propagation direction of the display light L. The liquid crystal display panel 12A is sandwiched between these inner surfaces.

[0041] The two first abutment portions 173A and 173B have the same configuration as the first abutment portions 73A and 73B of the first embodiment, and are located inside in the X direction of the corners 12C on both sides in the X direction of the liquid crystal display panel 12A.

[0042] The two first elastic portions 41 and 42 are provided in place of the first elastic portions 71A and 71B of the first embodiment, and are positioned so as to face the two first abutment portions 173A and 173B in the Y direction, respectively. As shown in Fig. 12, the two first elastic portions 41 and 42 include first contact surfaces 41a and 42a, second contact surfaces 41b and 42b, and finger hook surfaces 41c and 42c, respectively. Similar to the contact surface 71s (see FIG. 6) of the first embodiment, the first contact surfaces 41a and 42a are oriented obliquely upward so as to face the first abutment portions 73A and 73B and are oriented perpendicular to the surface direction of the liquid crystal display panel 12A. As shown in FIG. 13, the first contact surfaces 41a and 42a are shaped to contact the lower side surfaces of the liquid crystal display panel 12A and press the liquid crystal display panel 12A toward the first abutment portions 73A and 73B with a force F1 in a direction along the liquid crystal display panel 12A.

[0043] The second contact surfaces 41b, 42b are located at the upper ends of the first contact surfaces 41a, 42a and extend in the Z direction (the light traveling direction of the display light L). The second contact surfaces 41b, 42b form rectangular flat surfaces that are long in the X direction. The length of the second contact surfaces 41b, 42b in the Z direction is shorter than the length of the first contact surfaces 41a, 42a in the Z direction, and is set to, for example, approximately one-fifth to one-seventh the length of the first contact surfaces 41a, 42a. Furthermore, the second contact surfaces 41b, 42b are formed so as to follow the drawing direction of a pair of molds that injection mold the light box 70a. 13, the second contact surfaces 41b and 42b come into contact with an upper edge portion 12P of the lower end portion of the liquid crystal display panel 12A, thereby pressing the liquid crystal display panel 12A with a force F2 that includes a Z-direction component. The Z-direction component of the force F2 presses the liquid crystal display panel 12A toward the tube portion 75. Therefore, the liquid crystal display panel 12A is held in the Z direction by the second contact surfaces 41b and 42b. As a result, the liquid crystal display panel 12A is supported in the three directions of X, Y and Z by the light box 70a alone.

[0044] The finger hook surfaces 41c and 42c are located above the second contact surfaces 41b and 42b, and are portions on which the fingers of an assembly worker are hooked when assembling the liquid crystal display panel 12A to the light box 70a and elastically deforming the first elastic portions 41 and 42 in a direction away from the optical axis center of the display light L. The finger hook surface 41c is formed between the second contact surface 41b and the upper surface of the first elastic portion 41 as an inclined surface that slopes upward in a direction away from the optical axis center of the display light L. The finger hook surface 42c is formed between the second contact surface 42b and the upper surface of the first elastic portion 42 as a surface that is substantially L-shaped when viewed from the X direction.

[0045] (effect) According to the second embodiment described above, the following effects are achieved. The first elastic portions 41, 42 have, as contact surfaces, first contact surfaces 41a, 42a that press the side surface of the lower end portion of the liquid crystal display panel 12A toward the first abutment portions 173A, 173B along the surface direction of the liquid crystal display panel 12A, and second contact surfaces 41b, 42b that press the edge portion 12P formed by the side surface of the liquid crystal display panel 12A and the upper surface from which the display light L is emitted in the Z direction that intersects the surface direction. This configuration allows the light box 70a to hold the liquid crystal display panel 12A in both its planar direction and a direction intersecting the planar direction, thereby enabling the liquid crystal display panel 12A to be held by a single component (the light box 70a). Furthermore, the light box 70a is prevented from coming off the liquid crystal display panel 12A during assembly, which makes it easier to assemble the display device 10a.

[0046] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0047] (Variation) In the second embodiment, the configuration of the first elastic portions 41 and 42 can be changed as appropriate. 14, the first elastic portion 51 of the light box 70b is provided in place of the first elastic portion 41 (see FIG. 12) and does not have the second contact surface 41b (see FIG. 12). The first elastic portion 51 includes a panel direction pressing portion 52 and a panel cross direction pressing portion 53. The panel-direction pressing portion 52 has the same configuration and action as the first contact surface 41a (see FIG. 12), and has a first contact surface 52a that presses the side surface of the liquid crystal display panel 12A with a force F1 shown in FIG. The panel-crossing direction pressing portion 53 is located at the upper end of a side surface of the panel-direction pressing portion 52 extending in the Z direction (in this example, the side surface farthest from the corner of the liquid crystal display panel 12A, out of the two side surfaces extending in the Z direction). The panel-crossing direction pressing portion 53 has a second contact surface 53a having the same configuration and function as the second contact surface 41b (see FIG. 12). The panel-crossing direction pressing portion 53 has a polygonal (pentagonal) columnar shape extending in the X direction, and one of the side surfaces of this columnar shape is the second contact surface 53a. The second contact surface 53a is a flat surface inclined upward so as to approach the center of the optical axis of the display light L. The second contact surface 53a is located to the side of and above the first contact surface 52a in the X direction. The second contact surface 53a presses the lower end of the light exit surface of the liquid crystal display panel 12A from which the display light L is emitted with a force F3 including a Z-direction component. The Z-direction component of the force F3 presses the liquid crystal display panel 12A toward the cylindrical portion of the light box 70b. Finger hook surfaces 52c and 53c are formed on the upper portions of the first contact surface 52a and the second contact surface 53a. The finger hook surfaces 52c and 53c are formed as flat surfaces extending in the Z direction between the first contact surface 52a and the upper surface of the first elastic portion 51 and between the second contact surface 53a and the upper surface of the first elastic portion 51, respectively. Similarly to the first elastic portion 51, the first elastic portion 42 of the second embodiment may also be configured to include a panel direction pressing portion 52 and a panel cross direction pressing portion 53. The above-described modified example provides the following effects. The second contact surface 53a is formed at a position offset from the first contact surface 52a in the X direction in which the bottom end of the liquid crystal display panel 12A extends. According to this configuration, it is possible to hold the liquid crystal display panel 12A with one component (light box 70b).

[0048] In each of the above embodiments, the number, positions and shapes of the first elastic portions 41, 42, 51, 71A, 71B, the second elastic portion 72, the first abutment portions 73A, 73B, 173A, 173B, the second abutment portions 74A, 74B, and the holding portions 172, 174 can be changed as appropriate. In the first embodiment, the second elastic portion 72 and the second abutment portions 74A and 74B may be omitted, and in the second embodiment, the holding portions 172 and 174 may be omitted. In the first embodiment, the number of the third elastic portion 83 of the cover 80 is one, but it may be two or more. Also, the third elastic portion 83 may be omitted. In each of the above embodiments, the cover 80 may be omitted. Even in this case, the light boxes 70, 70a can hold the liquid crystal display panel 12A by themselves. This configuration can reduce the number of parts in the display device 10. In particular, the second embodiment and the modified example shown in FIG. 14 and the like are particularly suited to omitting the cover 80 because the light boxes 70a, 70b can hold the liquid crystal display panel 12A in the Z direction as well. In each of the above embodiments, the folding mirror 20 may be omitted. In each of the above embodiments, the illumination optical system 18 includes two lenses 13 and 14, but the number of lenses may be one or three or more. Furthermore, the type and shape of the lenses that make up the illumination optical system 18 can be changed as appropriate. In each of the above embodiments, the virtual image display surface K is parallel to the road surface, but it does not have to be parallel to the road surface. That is, the panel installation surface 75a and the liquid crystal display panel 12A may extend in a direction perpendicular to the Z direction. Furthermore, in each of the above embodiments, the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle other than the vehicle 200. The projection target member is not limited to the windshield 201, but may be a dedicated combiner. [Explanation of symbols]

[0049] 1. Viewer 10,10a Display device 11 Light source board 11a light source 12 Display panel unit 12A LCD display panel 12B relay board 12C Corner 12F Flexible Flat Cable 12P edge part 13 First lens 13a Convex lens part 14 Second lens 15 Diffuser 18 Illumination optical system 20 Folding Mirror 30 Concave mirror 60 cabinets 62 Window 70,70a,70b Lightbox 41, 42, 51, 71A, 71B First elastic part 41a,42a,52a 1st contact surface 41b,42b,53a 2nd contact surface 41c,42c,52c,53c Finger rest surface 52 Panel direction holding part 53 Panel cross direction holding part 71s contact surface 72 Second elastic part 72t claw part 73A,73B,173A,173B 1st abutment part 74A, 74B Second abutment part 75 Cylinder part 75a Panel installation surface 76,86a Locked part 80,80a cover 82 Interconnection board holder 83 Third elastic part 85 Frame 85h light passing hole 86,76a Locking claw part 87 Side wall 100 Head-up display device 172,174 Holding part 200 vehicles 201 Windshield E1 1st end E2 2nd end E3 3rd end F1~F3 force K Virtual image display surface L display light V Virtual Image IL illumination light

Claims

1. A head-up display device that displays a projection image by projecting display light onto a projection member, A light source; a display panel that receives illumination light from the light source and emits the display light; a holder that holds the display panel in a state inclined with respect to a light traveling direction of the display light, The holder includes: A first abutment portion that comes into contact with the display panel; a first elastic portion having a contact surface that presses the display panel so as to press the display panel against the first abutment portion, the first elastic portion is located at an end side of the display panel that is inclined with respect to the light traveling direction and that is closer to the light source, The contact surface is formed so as to be exposed in the light traveling direction as the holder alone. Head-up display device.

2. The head-up display device includes: A second abutment portion that comes into contact with the display panel; a second elastic portion that presses the display panel against the second abutment portion, the second elastic portion and the second abutment portion are shaped to face a side surface and an upper surface of the display panel, respectively, and are aligned in a second direction perpendicular to a first direction in which the first elastic portion and the first abutment portion are aligned; The head-up display device according to claim 1 .

3. the head-up display device includes a cover attached to the holder and covering the display panel, the cover includes a third elastic portion that presses the display panel against the holder when the cover is attached to the holder, the display panel is held by the holder alone, by the first elastic portion and the first abutment portion; The head-up display device according to claim 1 .

4. The contact surface is a first contact surface that presses a side surface of the display panel on the end side toward the first abutment portion along a surface direction of the display panel; a second contact surface that presses an edge portion formed by the side surface of the display panel and an upper surface from which the display light is emitted, in a direction intersecting the planar direction; The head-up display device according to claim 1 .

5. the second contact surface is formed at a position offset from the first contact surface in a direction in which the end of the display panel extends. The head-up display device according to claim 4.

6. the first elastic portion is formed to be elastically deformable in a direction away from the first abutment portion by contact with the display panel when the display panel is attached to the holder. The head-up display device according to any one of claims 1 to 5.

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