Image generation device

Abstract

To provide an image generation device that suppresses the influence on a display device caused by deformation of a housing due to temperature changes.SOLUTION: The display device generates an image using light emitted from a light source. The housing holds the display device. A biasing member biases the display device with respect to the housing. The biasing member has at least one folded portion that is folded so as to be convex or concave when viewed in the plane direction of the display device.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to image generation devices. [Background technology]

[0002] Patent Document 1 discloses a head-up display (HUD) that projects image light, which forms an image emitted from a picture generation unit (PGU), onto a windshield using an optical system, and reflects the image light from the windshield to superimpose a virtual image on the real space in front of the vehicle. In the image generation unit, a display device is attached to the PGU housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 193074 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the PGU housing is deformed due to temperature changes, the liquid crystal display device fixed to the PGU housing may be damaged or deteriorated due to the difference in thermal expansion coefficient between the resin PGU housing and the glass-containing liquid crystal display device.

[0005] The present disclosure aims to provide an image generating device that suppresses the influence of deformation of a housing due to temperature changes on a display device. [Means for solving the problem]

[0006] An image generating device according to one aspect of the present disclosure includes: An image generating device that generates an image, a display device that generates the image using light emitted from a light source; a housing for holding the display device; a biasing member that biases the display device against the housing; It is equipped with The biasing member has at least one folded portion that is folded back so as to be convex or concave when viewed from the surface direction of the display device. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an image generating device that suppresses the influence of deformation of a housing due to temperature changes on a display device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a head-up display (HUD) according to an embodiment of the present disclosure, viewed from the side of a vehicle. [Figure 2] 3 is a perspective view illustrating a holding structure of the liquid crystal display device by a housing according to the first embodiment; FIG. [Figure 3] 3 is a view of the holding structure of FIG. 2 as seen from the light irradiation surface side of the liquid crystal display device. [Figure 4] 4 illustrates a cross section taken along line IV-IV in FIG. 3, viewed from the direction of the arrows. [Figure 5] FIG. 2 is a perspective view illustrating the configuration of a holder. [Figure 6] FIG. 10 is a perspective view illustrating a holding structure of a liquid crystal display device by a housing according to a second embodiment. [Figure 7] 7 is a view of the holding structure of FIG. 6 as seen from the light irradiation surface side of the liquid crystal display device. [Figure 8] 8 illustrates a cross section taken along line VIII-VIII in FIG. 7, viewed from the direction of the arrows. [Figure 9] 9 illustrates a cross section taken along line IX-IX in FIG. 7, viewed from the direction of the arrows. [Figure 10] 10 is a perspective view illustrating the configuration of a holder 80 that holds a liquid crystal display device according to a third embodiment. FIG. [Figure 11] 1 is a diagram showing a configuration in which a liquid crystal display device is held by a holder, viewed from the light irradiation surface side of the liquid crystal display device 30. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, arrow U indicates the upward direction of the illustrated structure. Arrow D indicates the downward direction of the illustrated structure. Arrow F indicates the forward direction of the illustrated structure. Arrow B indicates the backward direction of the illustrated structure. Arrow R indicates the rightward direction of the illustrated structure. Arrow L indicates the leftward direction of the illustrated structure. These directions are relative directions set for the image generation device 3 shown in FIG. 1, and the upward direction is the emission direction of image light L1 emitted from the image generation device 3.

[0010] FIG. 1 is a schematic diagram of a head-up display (HUD) according to an embodiment of the present disclosure, viewed from the side of a vehicle. As illustrated in FIG. 1, the HUD 1 is mounted on a vehicle 100. For example, the HUD 1 is disposed in the dashboard of the vehicle 100. The HUD 1 functions as a visual interface between the vehicle 100 and an occupant of the vehicle 100. Specifically, the HUD 1 is configured to display predetermined information as a virtual image toward the occupant of the vehicle 100 so that the information is superimposed on a real space outside the vehicle 100 (for example, the surrounding environment in front of the vehicle 100). The predetermined information is displayed as a still image or a moving image (video). The HUD 1 is an example of an image display device.

[0011] The HUD 1 comprises an HUD main body 2, an image generation unit (PGU) 3, a plane mirror 4, a concave mirror 5, and a control unit 6. The HUD main body 2 has a housing 2A and an exit window 2B. The image generation unit 3, the plane mirror 4, the concave mirror 5, and the control unit 6 are arranged inside the housing 2A. The exit window 2B is made of a transparent plate that transmits visible light.

[0012] The image generating device 3 is configured to generate a predetermined image for forming a virtual image and emit light that constitutes the image (hereinafter referred to as image light). The image light emitted from the image generating device 3 is, for example, visible light. The image generating device 3 has a light source 10, optical components 20, and a liquid crystal display device 30. The light source 10, optical components 20, and liquid crystal display device 30 are housed in a housing 40. The housing 40 is made of resin.

[0013] The light source 10 is, for example, an LED light source or a laser light source. The LED light source is, for example, a white LED light source. The laser light source is, for example, an RGB laser light source configured to emit red laser light, green laser light, and blue laser light, respectively. The optical component 20 includes a prism, a lens, a diffuser, a magnifying glass, etc. as appropriate. The optical component 20 transmits light emitted from the light source and emits it toward the liquid crystal display device 30.

[0014] The liquid crystal display device 30 comprises liquid crystal, polarizing film, and a drive circuit (not shown). By applying a voltage to the liquid crystal by the drive circuit, the polarizing film can be switched between a state in which light is transmitted and a state in which light is not transmitted. The liquid crystal and polarizing film are divided into multiple pixels, and each pixel can be switched between a light transmitting and a light non-transmitting state. A predetermined image is generated by transmitting light through some pixels and opaque to light through other pixels.

[0015] The plane mirror 4 is disposed on the optical path of the image light L1 emitted from the image generating device 3. The plane mirror 4 is configured to reflect the image light L1 emitted from the image generating device 3 toward the concave mirror 5.

[0016] The concave mirror 5 is disposed on the optical path of the image light L1 emitted from the plane mirror 4. The concave mirror 5 is configured to reflect the image light L1 emitted from the image generation device 3 and reflected by the plane mirror 4, toward the windshield 101. The concave mirror 5 reflects the image light L1 emitted by the image generation device 3 so that the light image emitted and formed by the image generation device 3 is formed on the windshield 101 at a predetermined magnification. The concave mirror 5 may be configured to be rotatable about a rotation axis.

[0017] The control unit 6 is configured to control the operation of each part of the HUD 1. The control unit 6 is connected to a vehicle control unit that controls the driving of the vehicle 100. The control unit 6 controls the operation of each part of the HUD 1 based on vehicle driving information, surrounding environment information, and the like transmitted from the vehicle control unit. The control unit 6 can be realized by one or more processors and memories. Examples of the processor include a CPU, an MPU, and a GPU. Examples of the memory include a ROM and a RAM. In this case, the ROM is an example of a non-transitory computer-readable medium that stores a computer program that executes processing related to the operation of each part of the HUD 1. A general-purpose microprocessor specifies at least a portion of the computer program stored in the ROM, expands it on the RAM, and executes the above-mentioned processing in cooperation with the RAM.

[0018] In the HUD 1 configured as described above, as illustrated in FIG. 1 , image light L1 emitted from the image generation device 3 is reflected by the plane mirror 4 and the concave mirror 5, and then emitted from the exit window 2B of the HUD main body 2. The image light L1 emitted from the exit window 2B is irradiated onto the windshield 101. A portion of the light irradiated onto the windshield 101 from the exit window 2B is reflected toward the occupant's viewpoint E. As a result, the occupant recognizes the image light L1 emitted from the HUD main body 2 as a virtual image formed at a predetermined distance in front of the windshield 101. In this way, the image generated by the image generation device 3 is superimposed on the real space in front of the vehicle 100 through the windshield 101, and as a result, the occupant can visually recognize a virtual image object O formed by a predetermined image as floating above the road located outside the vehicle 100.

[0019] Next, a holding structure of the liquid crystal display device 30 according to the first embodiment by the housing 40 will be described with reference to FIGS.

[0020] Fig. 2 is a perspective view illustrating a holding structure of a liquid crystal display device 30 according to the first embodiment, using a housing 40. Fig. 3 is a view of the holding structure of Fig. 2, seen from the light irradiation surface side of the liquid crystal display device 30. Fig. 4 illustrates a cross section taken along line IV-IV in Fig. 3, seen from the direction of the arrows. Fig. 5 is a perspective view illustrating the configuration of a holder 50.

[0021] 2 and 3, the housing 40 has a holder 50 that holds the liquid crystal display device 30. Although not shown, the housing 40 also has, in addition to the holder 50, a main body portion that is disposed below the holder 50 and that houses the light source 10 and optical components 20, and a cover portion that is disposed above the holder 50 and that covers the liquid crystal display device 30. The holder 50 may be configured separately from the main body portion and the cover portion, or may be formed as a single member.

[0022] The liquid crystal display device 30 has a support member 31, a flexible substrate 32, and a liquid crystal display 33. As illustrated in Fig. 4, the support member 31 is configured to support the liquid crystal display 33. The support member 31 is formed of, for example, a transparent member. As illustrated in Figs. 2 and 3, one end of the flexible substrate 32 is connected to the liquid crystal display 33, and the other end extends, for example, downward from the holder 50.

[0023] The liquid crystal display 33 has a frame portion 34 and a liquid crystal portion 35. The frame portion 34 is configured to surround the periphery of the liquid crystal portion 35. The liquid crystal portion 35 includes liquid crystal and a polarizing film (not shown), and displays a predetermined image by switching between a light transmitting and non-transmitting state for each pixel.

[0024] For example, when the aspect ratio of the liquid crystal unit 35 differs from the aspect ratio of a virtual image (image) displayed in front of the vehicle 100, a region of the entire area of ​​the liquid crystal unit 35 that corresponds to the aspect ratio of the virtual image (image) is set as the effective display area 35A that displays the image that forms the virtual image. In this example, the front region of the entire area of ​​the liquid crystal unit 35 is set as the effective display area 35A, and the other region is set as an ineffective display area that does not contribute to the display of the image that forms the virtual image.

[0025] 5, the holder 50 has a mounting portion 51 and a side wall portion 52. The liquid crystal display device 30 is mounted on the mounting portion 51. The side wall portion 52 surrounds the periphery of the mounting portion 51.

[0026] An opening 51A is formed in the mounting portion 51. Light emitted from the light source 10 and refracted or reflected by the optical component 20 enters the holder 50 through the opening 51A. In this example, the opening 51A has a shape corresponding to the effective display area 35A of the liquid crystal unit 35. The light that enters through the opening 51A and is irradiated onto the effective display area 35A of the liquid crystal unit 35 is transmitted through the liquid crystal unit 35 and emitted as image light L1 that forms a predetermined image.

[0027] The holder 50 has elastic ribs 53. The elastic ribs 53 are formed, for example, continuously with the side wall portions 52 of the holder 50. As illustrated in FIGS. 2 and 3, the elastic ribs 53 are configured to bias the liquid crystal display device 30 against the holder 50. The liquid crystal display device 30 is biased by the elastic ribs 53 along the surface direction of the liquid crystal display device 30. The elastic ribs 53 are an example of a biasing member.

[0028] Here, the surface direction of the liquid crystal display device 30 refers to a direction (in this example, the front-rear and left-right directions) parallel to the emission surface (in this example, the upper surface) of the liquid crystal section 35 of the liquid crystal display device 30. Moreover, when the liquid crystal display device 30 is biased along the surface direction, it includes not only biasing in the same direction as the surface direction but also biasing in a direction within a range of less than (±) 45 degrees from the surface direction.

[0029] In this example, the liquid crystal display device 30 is biased forward toward the front side wall portion 52F by two elastic ribs 53 formed continuously on the rear side wall portion 52B of the holder 50.

[0030] For example, when attaching the holder 50 to the liquid crystal display device 30, the liquid crystal display device 30 presses the elastic rib 53, deforming the elastic rib 53 backward. When the liquid crystal display device 30 is mounted on the mounting portion 51, the elastic restoring force of the elastic rib 53 urges the liquid crystal display device 30 toward the front side wall portion 52F of the holder 50 along the surface direction of the liquid crystal display device 30.

[0031] 4, the elastic rib 53 has a folded portion 531 folded back so as to convex upward when viewed from the left. In other words, the folded portion 531 is folded back so as to convex in the light emission direction of the liquid crystal display device 30 when viewed from the left, and is formed in a downward U-shape. The left direction is an example of a direction that is the surface direction of the liquid crystal display device 30 and intersects with the direction in which the liquid crystal display device 30 is biased.

[0032] The elastic rib 53 has, on the surface facing the liquid crystal display device 30, a guide surface 532 extending in a direction intersecting the surface direction of the liquid crystal display device 30. The guide surface 532 is inclined downward from the folded portion 531 so as to approach the liquid crystal display device 30. When the liquid crystal display device 30 is attached to the holder 50 from above, the end of the liquid crystal display device 30 is guided by the guide surface 532 and mounted on the mounting portion 51.

[0033] The elastic rib 53 has a hood portion 533. The hood portion 533 is configured to protrude toward the liquid crystal display device 30 beyond an abutment surface 534 with which the rear end portion of the liquid crystal display device 30 abuts, and to cover the rear end portion of the liquid crystal display device 30.

[0034] The holder 50 has a contact rib 54. The contact rib 54 supports the front end of the liquid crystal display device 30. In this example, as shown in FIG. 3, the contact rib 54 is formed continuously with the front side wall portion 52F of the holder 50 at a position corresponding to the center in the arrangement direction of the two elastic ribs 53. The front end of the liquid crystal display device 30 contacts the contact rib 54, thereby supporting the liquid crystal display device 30. The contact rib 54 is an example of a support portion.

[0035] The contact rib 54 has a hood portion 541. The hood portion 541 is configured to protrude toward the liquid crystal display device 30 beyond a contact surface 542 with which the front end portion of the liquid crystal display device 30 contacts, and to cover the front end portion of the liquid crystal display device 30.

[0036] According to the holding structure for the liquid crystal display device 30 of the first embodiment, the liquid crystal display device 30 is positioned in the holder 50 by being biased against the holder 50 by the elastic ribs 53. Furthermore, because the elastic ribs 53 are elastically deformable by the folded portions 531, even if the holder 50 is deformed due to a temperature change, the deformation is absorbed by the elastic ribs 53. This makes it possible to suppress the influence of deformation of the holder 50 due to temperature changes on the liquid crystal display device 30, which is caused by the difference in thermal expansion coefficient between the resin PGU housing and the liquid crystal display device, which includes glass.

[0037] Furthermore, the folded portion 531 of the elastic rib 53 is formed so as to be convex when viewed from the left, so that when molding the holder 50 using a mold, the holder 50 can be molded by vertical molding without using a special molding method such as sliding molding.

[0038] Furthermore, since the front end of the liquid crystal display device 30 is supported by the contact rib 54, the liquid crystal display device 30 can be prevented from falling off the holder 50 due to the biasing force of the elastic rib 53.

[0039] Furthermore, when the liquid crystal display device 30 is attached to the holder 50 from above, the rear end of the liquid crystal display device 30 is guided along the guide surface 532, improving the ease of assembling the liquid crystal display device 30 to the holder 50.

[0040] When the liquid crystal display device 30 is guided along the guide surface 532, the elastic ribs 53 are pushed backward and deformed by the rear end of the liquid crystal display device 30. At this time, since the guide surface 532 is inclined downward from the folded portion 531 so as to approach the liquid crystal display device 30, the elastic ribs 53 deform along the rear and are less likely to deform downward. This improves the ease of assembling the liquid crystal display device 30 to the holder 50.

[0041] Furthermore, the rear end of the liquid crystal display device 30 is covered by the hood portion 533 that projects beyond the contact surface 534 toward the liquid crystal display device 30, so that the liquid crystal display device 30 can be prevented from coming off the holder 50 upward.

[0042] In the above embodiment, the elastic ribs 53 of the holder 50 are formed on the rear sidewall portion 52B and are configured to urge the liquid crystal display device 30 forward. However, the elastic ribs 53 may be formed on the front sidewall portion 52F and configured to urge the liquid crystal display device 30 backward. Furthermore, the holder 50 may have elastic ribs that urge the liquid crystal display device 30 leftward or rightward in addition to or instead of the elastic ribs 53 that urge the liquid crystal display device 30 forward or backward.

[0043] In the above embodiment, the folded portion 531 of the elastic rib 53 is folded so as to be convex when viewed from the left. However, the folded portion 531 may be folded so as to be concave when viewed from the left. Alternatively, the elastic rib 53 may have a plurality of folded portions 531 that are folded so as to be convex or concave when viewed from the left.

[0044] Second Embodiment Next, a holding structure of a liquid crystal display device 30 by a housing 40 according to a second embodiment will be described with reference to Figures 6 to 9. Components that are substantially the same as those of the holding structure according to the first embodiment will be given the same reference numerals, and repeated explanations will be omitted.

[0045] Fig. 6 is a perspective view illustrating a holding structure of a liquid crystal display device 30 according to a second embodiment, using a housing 40. Fig. 7 is a view of the holding structure of Fig. 6, seen from the light irradiation surface side of the liquid crystal display device 30. Fig. 8 illustrates a cross section taken along line VIII-VIII in Fig. 7, seen from the direction of the arrows. Fig. 9 illustrates a cross section taken along line IX-IX in Fig. 7, seen from the direction of the arrows.

[0046] 6, the housing 40 has a holder 60 that holds the liquid crystal display device 30. Although not shown, the housing 40 also has, in addition to the holder 60, a main body portion that is disposed below the holder 60 and that houses the light source 10 and optical components 20, and a cover portion that is disposed above the holder 60 and that covers the liquid crystal display device 30. The holder 60 may be configured separately from the main body portion and the cover portion, or may be formed as a single member.

[0047] As illustrated in FIG. 8, the holder 60 has a mounting portion 61 and a sidewall portion 62. The liquid crystal display device 30 is mounted on the mounting portion 61. The sidewall portion 62 surrounds the periphery of the mounting portion 61. An opening 61A is formed in the mounting portion 61. Light emitted from the light source 10 and refracted or reflected by the optical component 20 enters the holder 60 through the opening 61A. The opening 61A has a shape corresponding to the effective display area 35A (see FIG. 2) of the liquid crystal unit 35. Furthermore, as illustrated in FIG. 9, the mounting portion 61 has an opening 61B formed therein to accommodate elastic ribs 72 of a heat sink 70, which will be described later.

[0048] 6 and 7, the holder 60 has a contact rib 63. The contact rib 63 supports the front end of the liquid crystal display device 30. In this example, the contact rib 63 is formed continuously with the front side wall portion 62F of the holder 60 at a position corresponding to the center in the arrangement direction of two elastic ribs 72 of the heat sink 70, which will be described later. The front end of the liquid crystal display device 30 contacts the contact rib 63, thereby supporting the liquid crystal display device 30. The contact rib 63 is an example of a support portion.

[0049] 8, the contact rib 63 has a hood portion 631. The hood portion 631 is configured to protrude toward the liquid crystal display device 30 beyond a contact surface 632 with which the front end portion of the liquid crystal display device 30 abuts, and to cover the front end portion of the liquid crystal display device 30.

[0050] 6 and 7, the image generation device 3 has a heat sink 70. The heat sink 70 is disposed on the light-emitting surface of the liquid crystal display device 30 and dissipates heat generated by the liquid crystal display device 30.

[0051] The heat sink 70 has an opening 70A formed therein, through which the image light L1 emitted from the liquid crystal display device 30 passes. The opening 70A has a shape corresponding to the effective display area 35A (see FIG. 2) of the liquid crystal section 35. The image light L1 emitted from the liquid crystal section 35 and passing through the opening 70A is emitted from the image generation device 3.

[0052] The ineffective display area other than the effective display area 35A of the liquid crystal section 35 is covered with the heat sink 70. In this way, the ineffective display area of ​​the entire area of ​​the liquid crystal section 35 is in contact with the heat sink 70, so that the heat dissipation area of ​​the liquid crystal section 35 can be increased, and the heat dissipation effect can be improved.

[0053] The heat sink 70 has a hook portion 71 and an elastic rib 72. As illustrated in Fig. 8, the hook portion 71 extends from the light-emitting surface of the liquid crystal display 33 to the side surface of the liquid crystal display 33 and the support member 31. The hook portion 71 is an example of an engagement portion.

[0054] As illustrated in FIG. 9, the elastic ribs 72 are disposed on the heat sink 70 between the side wall 62 of the holder 60 and the liquid crystal display device 30. As shown in FIG.

[0055] The elastic ribs 72 are configured to bias the liquid crystal display device 30 against the holder 60. The liquid crystal display device 30 is biased along the surface direction of the liquid crystal display device 30 by the hook portions 71 and the elastic ribs 72. The elastic ribs 72 are an example of a biasing portion.

[0056] In this example, the liquid crystal display device 30 is biased forward toward the front side wall portion 62F of the holder 60 by two hook portions 71 and two elastic ribs 72 of the heat sink 70 arranged between the rear side wall portion 62B of the holder 60 and the liquid crystal display device 30.

[0057] For example, when attaching the heat sink 70 to the liquid crystal display device 30, the elastic ribs 72 are pushed backward to deform the elastic ribs 72, and the liquid crystal display device 30 is then hooked onto the hook portions 71. When the load applied to the elastic ribs 72 is released, the elastic restoring force of the elastic ribs 72 urges the liquid crystal display device 30 hooked onto the hook portions 71 toward the front side wall portion 62F of the holder 60 along the surface direction of the liquid crystal display device 30.

[0058] The elastic rib 72 has a folded portion 721 that is folded back so as to be convex downward when viewed from the left. In other words, it is folded back so as to be convex in the direction opposite to the light emission direction of the liquid crystal display device 30, and is formed in a U-shape.

[0059] According to the holding structure for the liquid crystal display device 30 of the second embodiment, the liquid crystal display device 30 is positioned on the holder 60 by biasing the liquid crystal display device 30 against the holder 60 using the hook portion 71 and the elastic rib 72. Furthermore, since the elastic rib 72 is elastically deformable due to the folded portion 721, even if the holder 60 deforms due to temperature changes, this deformation is absorbed by the elastic rib 72. This makes it possible to suppress the effect of deformation of the holder 60 on the liquid crystal display device 30.

[0060] Furthermore, the hook portion 71 and the elastic rib 72 are provided on the heat sink 70, and there is no need to provide a biasing member such as an elastic rib on the holder 60, so that an existing holder 60 can be used.

[0061] Furthermore, since the front end of the liquid crystal display device 30 is supported by the contact ribs 63, the liquid crystal display device 30 can be prevented from falling off the holder 60 due to the biasing force of the elastic ribs 72.

[0062] In the above embodiment, the hook portions 71 and elastic ribs 72 of the heat sink 70 are configured to urge the liquid crystal display device 30 forward, but they may also be configured to urge the liquid crystal display device 30 backward. Furthermore, in addition to or instead of the hook portions 71 and elastic ribs 72 configured to urge the liquid crystal display device 30 forward or backward, the heat sink 70 may have hook portions and elastic ribs configured to urge the liquid crystal display device 30 leftward or rightward.

[0063] In the above embodiment, the folded portion 721 of the elastic rib 72 is folded so as to be concave when viewed from the left. However, the folded portion 721 of the elastic rib 72 may be folded so as to be convex when viewed from the left. Alternatively, the elastic rib 72 may have a plurality of folded portions 721 that are folded so as to be convex or concave when viewed from the left.

[0064] In the above embodiment, the heat sink 70 has the hook portion 71 and the elastic rib 72. However, the heat sink 70 may be configured to have only the elastic rib 72. In this case, the liquid crystal display device 30 comes into contact with the elastic rib 72 and is urged along the surface direction of the liquid crystal display device 30 toward the front side wall portion 62F of the holder 60.

[0065] (Third embodiment) Next, a holding structure of a liquid crystal display device 30 by a housing 40 according to a third embodiment will be described with reference to Figures 10 and 11. Components that are substantially the same as those in the holding structure according to the first embodiment will be given the same reference numerals, and repeated explanations will be omitted.

[0066] Fig. 10 is a perspective view illustrating the configuration of a holder 80 that holds a liquid crystal display device 30 according to the third embodiment. Fig. 11 is a view of the configuration in which the liquid crystal display device 30 is held by the holder 80, as viewed from the light irradiation surface side of the liquid crystal display device 30.

[0067] 10, the housing 40 has a holder 80 that holds the liquid crystal display device 30. Although not shown, the housing 40 also has, in addition to the holder 80, a main body portion that is disposed below the holder 80 and that houses the light source 10 and optical components 20, and a cover portion that is disposed above the holder 80 and that covers the liquid crystal display device 30. The holder 80 may be configured separately from the main body portion and the cover portion, or may be formed as a single member.

[0068] As illustrated in FIG. 10, the holder 80 has a mounting portion 81. The liquid crystal display device 30 is mounted on the mounting portion 81. An opening 81A is formed in the mounting portion 81. Light emitted from the light source 10 and transmitted while being refracted or reflected by the optical component 20 enters the holder 80 through the opening 81A. The opening 81A has a shape corresponding to the effective display area 35A of the liquid crystal unit 35 (see FIG. 2). The mounting portion 81 also has an opening 81B.

[0069] The holder 80 has elastic ribs 83. The elastic ribs 83 are arranged inside the opening 81B. The elastic ribs 83 are configured to bias the liquid crystal display device 30 against the holder 80. The liquid crystal display device 30 is biased along the surface direction of the liquid crystal display device 30 by the elastic ribs 83. The elastic ribs 83 are an example of a biasing member.

[0070] In this example, two elastic ribs 83B are arranged in an opening 81B extending in the left-right direction at the rear end 80B of the holder 80, and one elastic rib 83L is arranged in an opening 81B extending in the front-rear direction at the left end 80L of the holder 80. Each elastic rib 83 has a C-shape when viewed from above perpendicular to the surface direction of the liquid crystal display device 30. The upward direction is an example of a direction intersecting the surface direction of the liquid crystal display device 30.

[0071] For example, when attaching the holder 80 to the liquid crystal display device 30, the liquid crystal display device 30 pushes the elastic rib 83B backward to deform the elastic rib 83B backward, and pushes the elastic rib 83L leftward to deform the elastic rib 83L leftward. When the liquid crystal display device 30 is mounted in a predetermined position on the mounting portion 81, the elastic restoring forces of the elastic ribs 83B and 83L urge the liquid crystal display device 30 toward the front end 80F and right end 80R of the holder 80 along the surface direction of the liquid crystal display device 30.

[0072] The elastic rib 83 has a first end 831 fixed to the holder 80 and a second end 832 that abuts against the liquid crystal display device 30. As illustrated in Fig. 11 , the first end 831 is disposed at a position that overlaps with the liquid crystal display device 30 when viewed from above, which is perpendicular to the surface direction of the liquid crystal display device 30. The above is an example of a direction that intersects with the surface direction of the liquid crystal display device 30.

[0073] The holder 80 has abutment ribs 84. In this example, abutment rib 84F is arranged at the front end 80F of the holder 80, and two abutment ribs 84R are arranged at the right end 80R of the holder 80. The abutment rib 84F supports the front end of the liquid crystal display device 30. The abutment rib 84R supports the right end of the liquid crystal display device 30. The front end of the liquid crystal display device 30 abuts against the abutment rib 84F, thereby supporting the liquid crystal display device 30. The right end of the liquid crystal display device 30 abuts against the abutment rib 84R, thereby supporting the liquid crystal display device 30.

[0074] According to the holding structure for the liquid crystal display device 30 of the third embodiment, the liquid crystal display device 30 is positioned on the holder 80 by the elastic ribs 83 biasing the liquid crystal display device 30 against the holder 80. Furthermore, because the elastic ribs 83 are elastically deformable, even if the holder 80 deforms due to temperature changes, this deformation is absorbed by the elastic ribs 83. This makes it possible to suppress the effect of deformation of the holder 80 on the liquid crystal display device 30.

[0075] Furthermore, since the first end 831 of each elastic rib 83 is disposed at a position that overlaps with the liquid crystal display device 30 when viewed from above, the space required for arranging the elastic ribs 83 in the holder 80 can be reduced.

[0076] Although the embodiments of the present invention have been described above, it goes without saying that the technical scope of the present invention should not be construed as being limited by the description of the present embodiments. The present embodiments are merely examples, and it will be understood by those skilled in the art that various modifications of the embodiments are possible within the scope of the invention described in the claims. The technical scope of the present invention should be determined based on the scope of the invention described in the claims and its equivalents.

[0077] In the first embodiment described above, the number and positions of the elastic ribs 53 and the contact ribs 54 are not limited to the example shown in FIG.

[0078] 3, in the first embodiment, the elastic ribs 53 and the abutment ribs 54 are arranged in an area of ​​the side wall 52 of the holder 50 that faces the liquid crystal portion 35 of the liquid crystal display device 30. However, for example, the elastic ribs 53 and the abutment ribs 54 may also be arranged in an area of ​​the side wall 52 of the holder 50 that faces the frame portion 34 of the liquid crystal display device 30. With this configuration, the elastic ribs 53 and the abutment ribs 54 press against the frame portion 34, thereby preventing bleeding of images displayed on the liquid crystal and other display defects.

[0079] As in the first embodiment, the folded portion 531 of the elastic rib 53 is convex or concave when viewed from the left, and the elastic rib 53 elastically deforms in the front-to-rear direction. That is, the force applied to the liquid crystal display device 30 is always directed forward, so even if the elastic rib 53 and the abutment rib 54 are arranged in an area of ​​the side wall portion 52 of the holder 50 facing the liquid crystal portion 35 of the liquid crystal display device 30, bleeding of images displayed on the liquid crystal and display defects are unlikely to occur.

[0080] In the second embodiment, the number and positions of the hook portions 71, the elastic ribs 72, and the contact ribs 63 are not limited to the example shown in FIG.

[0081] 7, in the second embodiment, the hook portions 71, the elastic ribs 72, and the abutment ribs 63 are arranged in an area of ​​the side wall portion 62 of the holder 60 that faces the liquid crystal portion 35 of the liquid crystal display device 30. However, the hook portions 71, the elastic ribs 72, and the abutment ribs 63 may also be arranged in an area of ​​the side wall portion 62 of the holder 60 that faces the frame portion 34 of the liquid crystal display device 30. With this configuration, the hook portions 71, the elastic ribs 72, and the abutment ribs 63 press against the frame portion 34, thereby preventing bleeding of images displayed on the liquid crystal and other display defects.

[0082] As in the second embodiment, the folded portion 721 of the elastic rib 72 is convex or concave when viewed from the left, and the elastic rib 72 elastically deforms in the front-to-rear direction. That is, the force applied to the liquid crystal display device 30 is always directed forward, so even if the hook portion 71, the elastic rib 72, and the abutment rib 63 are arranged in an area of ​​the side wall portion 62 of the holder 60 facing the liquid crystal portion 35 of the liquid crystal display device 30, bleeding of images displayed on the liquid crystal and display defects are unlikely to occur.

[0083] In the above embodiment, instead of the liquid crystal display device 30, a DMD (Digital Mirror Device) or the like may be used as a display device.

[0084] In the above embodiment, the image generation device 3 is disposed so that the image light L1 emitted from the liquid crystal display device 30 is emitted upward. However, for example, the image generation device 3 may be disposed so that the image light L1 emitted from the liquid crystal display device 30 is emitted forward.

[0085] In the above embodiment, the image light L1 emitted from the image generating device 3 may be configured to be incident directly on the concave mirror 5.

[0086] In the above embodiment, the reflecting member that reflects the image light onto the windshield 101 is the concave mirror 5. However, the reflecting member that reflects the image light onto the windshield 101 may be a plane mirror or the like.

[0087] In the above embodiment, the light emitted from the image generating device 3 is reflected by the concave mirror 5 and irradiated onto the windshield 101. However, for example, the image light L1 reflected by the concave mirror 5 may be irradiated onto a combiner (not shown) provided inside the windshield 101. The combiner is formed, for example, of a transparent plastic disk. A portion of the light irradiated onto the combiner from the image generating device 3 of the HUD main body 2 is reflected toward the occupant's viewpoint E, similar to when light is irradiated onto the windshield 101.

[0088] In the above embodiment, the HUD 1 is given as an example of an image display device, but the present invention is not limited to this. [Explanation of symbols]

[0089] 1 HUD 2 HUD main body 2A Housing 2B Exit window 3. Image generation device 4 plane mirror 5 concave mirror 6 Control Unit 10 light source 20 Optical Components 30 Liquid crystal display device 31 Support member 32 Flexible PCB 33 LCD display 34 Frame 35 LCD section 35A Effective display area 40 Housing 50 holder 51 Mounting section 51A aperture 52 Side wall 52B Rear side wall 52F Front side wall 53 Elastic Rib 531 Folded section 532 Guide surface 533 Food Section 534 Contact surface 54 Contact rib 541 Food Section 542 Contact surface 60 Holder 61 Mounting section 61A aperture 61B opening 62 Side wall 62B Rear side wall 62F Front side wall 63 Contact rib 631 Food Section 632 Contact surface 70 Heat sink 70A aperture 71 Hook 72 Elastic Rib 721 Folded section 80 Holder 80B Rear end 80F front end 80L left end 80R right end 81 Mounting section 81A Opening 81B opening 83 Elastic Rib 83B Elastic rib 83L Elastic Rib 831 First end 832 Second end 84 Contact rib 84F Contact rib 84R Contact rib 100 vehicles 101 Windshield

Claims

1. An image generating device that generates an image, a display device that generates the image using light emitted from a light source; a housing for holding the display device; a biasing member that biases the display device against the housing; It is equipped with the biasing member has at least one folded portion that is folded so as to be convex or concave when viewed from the surface direction of the display device; Image generating device.

2. The image generating device according to claim 1 , wherein the housing has a support portion that supports an end of the display device opposite to an end that abuts against the biasing member.

3. 3. The image generating device according to claim 1, wherein the biasing member is provided on the housing.

4. the biasing member has at least one folded portion folded so as to be convex when viewed from a surface direction of the display device, The image generating device according to claim 3 , wherein the biasing member has a guide surface on a surface facing the display device, the guide surface extending in a direction intersecting the surface direction.

5. The image generating device according to claim 3 , wherein the biasing member has a hood portion that projects toward the display device beyond a contact surface that contacts an edge of the display device.

6. a heat sink for radiating heat generated from the display device, 3. The image generating device according to claim 1, wherein the biasing member is provided on the heat sink.

7. The biasing member is an engagement portion that engages with the display device; a biasing portion that biases the display device against the housing; and The image generating device according to claim 6 , wherein the biasing portion has at least one folded portion folded back so as to be concave when viewed from the surface direction of the display device.

8. An image generating device that generates an image, a display device that generates the image using light emitted from a light source; a housing for holding the display device; a biasing member that biases the display device against the housing; It is equipped with the biasing member has a first end fixed to the housing and a second end abutting against the display device; an image generating device, wherein the first end of the biasing member is disposed at a position overlapping the display device when viewed in a direction intersecting a surface direction of the display device;

9. The image generating device according to claim 8 , wherein the biasing member has a C-shape when viewed in a direction intersecting with the surface direction of the display device.

Images