Display device and head-up display device

Abstract

The utility model provides a display device and a head-up display device which can restrain reduction of visual observability. A display device includes: a light source that emits illumination light; a second lenticular lens (15) that transmits the illumination light; a display panel having a display light emission region that receives the illumination light transmitted through the second biconvex lens (15) and emits display light; and a second lens housing case (22) which has an opening (28) through which the illumination light passes, and which surrounds the outer peripheral side of the second biconvex lens (15). The opening (28) has an inclined surface (28a) that is formed on the opening end surface of the opening (28), is inclined with respect to the center of the optical axis of the illumination light, and reflects light (L1, L2), which is a part of the incident illumination light, so as to reach the outside of the display light emission region.

Description

Technical Field

[0001] The utility model relates to a display device and a head-up display device. Background Art

[0002] The display device described in Patent Document 1 includes: a light source; a plurality of lenses that transmit illumination light from the light source; a liquid crystal display panel that receives the illumination light transmitted through the plurality of lenses and emits display light; and a plurality of casings that surround the light source, the plurality of lenses, and the liquid crystal display panel from the periphery.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2019 / 087912 Utility Model Content

[0006] Issues to be solved by utility models

[0007] In the structure of Patent Document 1, light from the light source passes through the openings of each housing. A portion of the light from the light source is reflected by the openings. When this reflected light reaches the eye range of the observer, the frame portion corresponding to the opening is visible, potentially reducing visibility.

[0008] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a display device and a head-up display device capable of suppressing a decrease in visual visibility.

[0009] Means for solving problems

[0010] In order to achieve the above-mentioned object, the display device according to the first aspect of the present invention has:

[0011] a light source that emits illuminating light;

[0012] an optical element that transmits the illumination light;

[0013] a display panel having a display light emitting region for receiving the illumination light transmitted through the optical element and emitting display light; and

[0014] a housing having an opening for the illumination light to pass through and surrounding the outer periphery of the optical element;

[0015] The opening has an inclined surface formed on an opening end surface thereof and inclined with respect to an optical axis center of the illumination light, so as to reflect the incident illumination light so as to reach outside the display light radiating area.

[0016] To achieve the above-mentioned object, a head-up display device according to a second aspect of the present invention includes the display device described above, and displays a virtual image by projecting the display light from the display device onto a projection member.

[0017] Utility model effect

[0018] According to the present invention, it is possible to suppress a decrease in visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a vehicle equipped with a head-up display device according to one embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a head-up display device according to one embodiment of the present invention.

[0021] Figure 3 It is a perspective view of a display device according to one embodiment of the present invention.

[0022] Figure 4 yes Figure 3 Cross-sectional view of line IV-IV.

[0023] Figure 5 It is a partial cross-sectional view of a display device according to one embodiment of the present invention.

[0024] Figure 6 It is magnified Figure 5 Figure VI of the range.

[0025] Figure 7 It is magnified Figure 6 Part of the diagram.

[0026] Figure 8 This is a perspective view of a second lens housing according to one embodiment of the present invention.

[0027] Figure 9 yes Figure 8 Cross-sectional view along line VIII-VIII.

[0028] Figure 10 It is a partial cross-sectional view of a display device according to one embodiment of the present invention.

[0029] Explanation of symbols

[0030] 1: visual observer;

[0031] 10: display device;

[0032] 11: Light source substrate;

[0033] 11a: light source;

[0034] 13: focusing lens;

[0035] 13a: convex lens portion;

[0036] 14: first biconvex lens;

[0037] 15: second biconvex lens;

[0038] 16: Diffuser;

[0039] 17: Display panel;

[0040] 17a: Display light radiating area;

[0041] 17b: border;

[0042] 18: thermal mirror;

[0043] 19: Light box;

[0044] 21: first lens receiving housing;

[0045] 21a: locking protrusion;

[0046] 21b: lens support portion;

[0047] 22: second lens receiving housing;

[0048] 22a: main body tube;

[0049] 22b: hook;

[0050] 22c: frame;

[0051] 22d: inclined portion;

[0052] 22e: flat part;

[0053] 23: panel support housing;

[0054] 23a: Setting surface;

[0055] 23b: receiving recess;

[0056] 23c: opening;

[0057] 23d: inclined surface;

[0058] 23e: step part;

[0059] 24: The panel presses the housing;

[0060] 24b: locking protrusion;

[0061] 25: hood;

[0062] 25a: hook;

[0063] 28: opening;

[0064] 28a: inclined surface;

[0065] 28b: step part;

[0066] 28b1: Side 1;

[0067] 28b2: second side;

[0068] 31: Reflector mirror;

[0069] 32: concave mirror;

[0070] 50: window;

[0071] 60: frame;

[0072] 60a: Upper shell;

[0073] 60b: lower housing;

[0074] 60h: through hole;

[0075] 61: opening;

[0076] 100: head-up display device;

[0077] 200: Vehicle;

[0078] 201: Windshield;

[0079] C: center of optical axis;

[0080] L: display light;

[0081] Li: lighting light;

[0082] L1~L4: light;

[0083] V: virtual image;

[0084] PL: Parting line. DETAILED DESCRIPTION

[0085] Reference Figures 1 to 10 An embodiment of the display device and the head-up display device according to the present invention will be described. Figures 4 to 7 、 Figure 9 、 Figure 10 In the cross-sectional view, some hatching is omitted.

[0086] like Figure 1As shown, the head-up display device 100 is installed in the dash panel of a vehicle 200. The head-up display device 100 emits display light L representing an image toward the windshield 201 of the vehicle 200. The display light L is reflected by the windshield 201, which serves as the front window glass, and reaches a viewer 1 (primarily the driver of the vehicle 200). As a result, a virtual image V can be displayed so that it can be visually observed by the viewer 1.

[0087] like Figure 2 As shown, the head-up display device 100 includes a display device 10 , a folding mirror 31 , a concave mirror 32 , and a housing 60 .

[0088] The display device 10 emits display light L representing an image under the control of a control unit (not shown). The specific structure of the display device 10 will be described later.

[0089] The folding mirror 31 reflects the display light L from the display device 10 toward the concave mirror 32. The folding mirror 31 is a plane mirror or a concave mirror. The concave mirror 32 magnifies the display light L reflected by the folding mirror 31 and reflects it toward the windshield 201. The folding mirror 31 may be omitted.

[0090] The housing 60 is formed of a non-translucent resin or metal and is a hollow, substantially rectangular parallelepiped. The housing 60 houses the various components of the head-up display device 100. Specifically, the housing 60 includes an upper case 60a and a lower case 60b.

[0091] The lower housing 60b is box-shaped and upwardly open. The lower housing 60b houses the folding mirror 31 and the concave mirror 32. A through hole 60h is formed on the inner bottom wall of the lower housing 60b for the display light L from the display device 10 to pass through. The display device 10 is mounted on the bottom outer surface of the lower housing 60b.

[0092] The upper housing 60a functions as a cover that closes the upper opening of the lower housing 60b. An opening 61 is formed in the upper housing 60a at a position facing the windshield 201. The upper housing 60a includes a curved plate-shaped window 50 that closes the opening 61. The window 50 is made of a translucent resin such as acrylic that transmits the display light L.

[0093] Next, the display device 10 will be described in detail.

[0094] like Figure 4 and Figure 5 As shown, the display device 10 includes: a light source substrate 11 having a plurality of light sources 11 a ; a condenser lens 13 ; a first lenticular lens 14 ; a second lenticular lens 15 ; a diffuser 16 ; a display panel 17 ; a heat mirror 18 ; and a light box 19 .

[0095] In the following description, the direction of travel of the illumination light Li emitted from the light source 11a is referred to as the Z direction, and the directions orthogonal to the Z direction are referred to as the X and Y directions. The X and Y directions are orthogonal to each other. In this example, the X direction runs along the length of the first biconvex lens 14, etc., and the Y direction runs along the width of the first biconvex lens 14, etc. Furthermore, in the Z direction, the traveling direction of the illumination light Li is considered upward, and the return direction of the light path of the illumination light Li is considered downward.

[0096] The light source substrate 11, condenser lens 13, first lenticular lens 14, second lenticular lens 15, diffuser 16, display panel 17, and heat mirror 18 are arranged in the Z direction, with their thickness directions respectively extending along the Z direction. From the side closest to the light source substrate 11, they are arranged in the following order: condenser lens 13 → first lenticular lens 14 → second lenticular lens 15 → diffuser 16 → display panel 17 → heat mirror 18.

[0097] Multiple light sources 11a emit illumination light Li under the control of a control unit (not shown). Light sources 11a are, for example, LEDs (Light Emitting Diodes). Multiple light sources 11a are mounted in a matrix on the top surface of the light source substrate 11. The top surface of the light source substrate 11 faces the condenser lens 13 of the light source substrate 11.

[0098] The condenser lens 13 is formed into a plate-like shape from a translucent resin or glass. It functions to align the individual rays of illumination light Li emitted from each light source 11a in the Z direction. The condenser lens 13 includes a plurality of convex lens portions 13a arranged in the X and Y directions. Each convex lens portion 13a is formed in a biconvex lens shape. The plurality of convex lens portions 13a are arranged facing the plurality of light sources 11a in the Z direction.

[0099] The first biconvex lens 14 is formed into a plate-like shape from a translucent resin or glass. It functions to disperse light in the Y direction to suppress uneven light intensity in the Y direction. Both the incident light surface and the exit light surface of the first biconvex lens 14 are formed in the shape of a cylindrical lens array, with semi-cylindrical components extending in the X direction arranged in the Y direction.

[0100] The second biconvex lens 15 is formed into a plate-like shape from a translucent resin or glass. It functions to diverge the illumination light Li as divergent light in the X-direction. The incident surface of the second biconvex lens 15 is formed in the shape of a cylindrical lens array, with semi-cylindrical components extending in the Y-direction arranged along the X-direction. The exit surface of the second biconvex lens 15 is formed as a curved surface that is concavely curved along the X-direction.

[0101] The diffuser 16 is a diffusion plate that suppresses unevenness in light intensity, and scatters the illumination light Li that has passed through the second lenticular lens 15 and then radiates the light toward the display panel 17 .

[0102] The display panel 17 is a TFT (Thin Film Transistor) liquid crystal display panel. It includes a display light emitting area 17a and a frame 17b. The display light emitting area 17a is rectangular, more precisely, a rectangle that is elongated in the X direction. Under the control of a control unit (not shown), it receives illumination light Li transmitted through the diffuser 16 and radiates display light L. The frame 17b is a metal frame member that surrounds the outer periphery of the display light emitting area 17a.

[0103] The heat mirror 18 is formed by providing a multilayer film on transparent glass to transmit visible light and reflect infrared light, thereby suppressing a temperature rise of the display panel 17 due to external light.

[0104] like Figure 3 and Figure 4 As shown, the light box 19 is formed of a light-shielding resin or metal and is cylindrically shaped, extending in the Z direction so as to surround the outer periphery of the display device 10. The light box 19 includes a plurality of housings 21, 22, 23, and 24, and a cover 25. The plurality of housings 21, 22, 23, and 24 and the cover 25 are separate bodies and are assembled in the Z direction.

[0105] The first lens housing 21 is formed into a rectangular cylindrical shape surrounding the light source substrate 11 and the condenser lens 13. The first lens housing 21 has a plurality of locking protrusions 21a (see Figure 3 ) and the lens support portion 21b (see Figure 4 A plurality of locking protrusions 21a are formed on the outer peripheral surface of the first lens housing 21. The lens support portion 21b is formed in a rectangular frame shape so as to support the outer peripheral portion of the first biconvex lens 14 at the upper portion of the first lens housing 21.

[0106] The second lens housing 22 is formed into a substantially rectangular cylindrical shape covering the outer peripheral side of the second biconvex lens 15 and the outer peripheral side of the light emitting surface of the second biconvex lens 15. Figure 8 As shown, the second lens housing 22 includes a main body tube 22a, a hook 22b as a locking portion, and a frame 22c. The main body tube 22a is rectangular. A plurality of hooks 22b are provided on the outer surface of the main body tube 22a facing downward.

[0107] The hook 22b as the locking portion of the second lens housing case 22 engages with the locking protrusion 21a (see FIG. 21 ) as the locked portion of the first lens housing case 21. Figure 3 ) is locked and fixed to the first lens housing case 21.

[0108] The frame portion 22c is formed as a partition that blocks the outer peripheral side of the upper surface of the second biconvex lens 15 and has an opening 28 for the illumination light Li that passes through the second biconvex lens 15. Figure 6 and Figure 8 As shown, it comprises an inclined portion 22d that tilts upward as it approaches the optical axis center C of the illumination light Li, and a flat portion 22e located near the optical axis center C of the inclined portion 22d. The optical axis center C is located at the center of a cross section taken along a direction perpendicular to the direction of light travel, coinciding with the center of the opening 28. The flat portion 22e is flat and extends in the X and Y directions, forming a rectangular frame shape elongated in the X direction. The opening 28 is formed on the inner periphery of the flat portion 22e. The opening 28 is formed as a rectangular shape elongated in the X direction, more precisely, a rectangle with rounded corners.

[0109] like Figure 6 and Figure 7 As shown, the opening 28 has an inclined surface 28a and a stepped portion 28b. Inclined surface 28a is formed throughout the circumference of the end face of the opening 28 and is located closer to the side (upper side) of the illumination light Li than the stepped portion 28b. Inclined surface 28a tilts outward away from the optical axis center C as it approaches the upper side. Inclined surface 28a is set at an angle of approximately 20° to 40° with respect to the Z direction. The upper surface of the frame portion 22c and the upper portion of the inclined surface 28a are connected by a curved surface.

[0110] Here, in the structure according to the comparative example in which the end face of the opening is parallel to the optical axis center C, the illumination light Li reflected by the end face reaches the display light emitting area 17a and further reaches the eye movement range of the visual observer as display light L. As a result, the outer frame corresponding to the opening 28 on the inner side of the virtual image V as viewed by the visual observer flickers in a noticeable manner, thereby reducing the visibility of the virtual image V.

[0111] In this regard, in the present embodiment, when the inclined surface 28a is as Figure 6 As shown, when receiving the light L1 as leakage light that is irradiated outside the irradiation target area in the illumination light Li, the leakage light L1 is reflected toward the outside of the optical axis center of the illumination light Li in a manner that reaches the outside of the display light irradiation area 17a of the display panel 17. In other words, the inclined surface 28a is formed at an inclination angle so that the light L1 after reflecting the illumination light Li does not contact the diffuser 16, which is the next optical element. As a result, the light L1 as reflected light from the inclined surface 28a is suppressed from reaching the eye movement range of the visual observer through the optical system (reflectors 31, 32 and windshield 201). Therefore, the outer frame corresponding to the opening 28 is suppressed from flickering in a conspicuous manner on the inner side of the virtual image V, and the visual observability of the virtual image V can be suppressed.

[0112] Step 28b is formed below the inclined surface 28a of opening 28. Step 28b is concave, opening in both the direction of optical axis center C and downward. Step 28b reduces the thickness T1 of the peripheral edge of opening 28 along optical axis center C, thereby reducing the area of ​​inclined surface 28a. Specifically, step 28b reduces the thickness T1 of the peripheral edge of opening 28 of frame 22c compared to the thickness of the portion of frame 22c outside opening 28.

[0113] like Figure 9 As shown, the step portions 28 b are formed on a pair of end surfaces of the opening 28 extending in the Y direction, but are not formed on a pair of end surfaces of the opening 28 extending in the X direction.

[0114] like Figure 7 As shown, the step portion 28b has a first surface 28b1 and a second surface 28b2. The first surface 28b1 extends in a direction perpendicular to the center of the optical axis. The first surface 28b1 is continuous with the lower end of the inclined surface 28a and extends from the lower end in a direction away from the center of the optical axis. The first surface 28b1 reflects the illumination light Li, so that the reflected light L2 (see Figure 6 ) is reflected toward the outside of the second biconvex lens 15 in the X direction.

[0115] The second surface 28b2 extends in the Z direction so as to be perpendicular to the first surface 28b1. The second surface 28b2 is continuous with an end portion of the first surface 28b1 that is away from the optical axis center, and extends downward from the end portion.

[0116] The second surface 28b2 reflects the illumination light Li and converts the reflected light L3 (see Figure 7 ) is formed at a position farther away from the optical axis center in the X direction than the inclined surface 28a so as to reach the first surface 28b1.

[0117] A convex parting line PL is formed at the lower corner of the inclined surface 28a. The parting line PL is formed at the location that separates the pair of molds (not shown) used for injection molding the second lens housing 22. The parting line PL is formed at the boundary between the inclined surface 28a and the first surface 28b1. By forming the parting line PL at this location, the parting line PL is less noticeable. Furthermore, compared to a configuration where the parting line PL is located on the inclined surface 28a, a portion of the illumination light Li is prevented from passing through the parting line PL and reaching the eye movement area.

[0118] This concludes the description of the second lens housing case 22 .

[0119] like Figure 4 and Figure 5 As shown, the panel support housing 23 is formed into a rectangular cylindrical shape to accommodate the diffuser 16 and is provided on the upper surface of the frame portion 22c of the second lens accommodating housing 22. Figure 10 As shown, the panel support case 23 includes a mounting surface 23 a on which the display panel 17 is mounted, a housing recess 23 b for housing the diffuser 16 , and an opening 23 c for allowing the illumination light Li to pass therethrough.

[0120] The installation surface 23a is located on the upper surface of the panel support housing 23 and supports the outer peripheral frame 17b of the display panel 17 from below. A receiving recess 23b is formed on the lower inner side of the installation surface 23a. The receiving recess 23b forms a frame-like shape that accommodates the outer peripheral side of the diffuser 16. The installation surface 23a, the receiving recess 23b, and the opening 23c are formed so as to be inclined with respect to the Y direction.

[0121] The opening 23c is formed on the lower side of the inner periphery of the receiving recess 23b. Figure 5 As shown, the opening size of the opening portion 23 c of the panel support housing 23 is formed to be larger in the X direction and the Y direction than the opening size of the opening portion 28 of the second lens storage housing 22 described above.

[0122] like Figure 10 As shown, the opening 23c has an inclined surface 23d and a stepped portion 23e. The inclined surface 23d and the stepped portion 23e have the same function and structure as the inclined surface 28a and the stepped portion 28b described above. For example, the inclined surface 23d reflects a portion of the illumination light L4 so that it reaches the frame 17b outside the display light radiating area 17a.

[0123] like Figure 3 and Figure 4 As shown, the panel pressing housing 24 is in the shape of a rectangular cylinder and presses the display panel 17 located on the installation surface 23a from above. A heat mirror 18 is provided on the upper surface of the panel pressing housing 24 so as to face the display panel 17. The panel pressing housing 24 is fixed to the panel support housing 23 by a hook (not shown) serving as a locking portion of the panel pressing housing 24 and a locking protrusion (not shown) serving as a locked portion of the panel support housing 23.

[0124] The cover 25 has a rectangular frame shape and covers the outer circumference of the upper surface of the heat mirror 18. The cover 25 is fixed to the panel pressing case 24 by hooks 25a of the cover 25 serving as locking portions and locking protrusions 24b of the panel pressing case 24 serving as locked portions.

[0125] Next, the operation of the display device 10 will be described.

[0126] The illumination light Li emitted from each light source 11a is formed into a roughly parallel direction by passing through the condenser lens 13, and most of the illumination light Li is directed toward the diffuser 16 and the display panel 17. However, although a portion of the illumination light Li, namely the light L1, L2, and L3, can be irradiated by the opening 28 of the second lens housing 22, even if irradiated, it will be reflected by the inclined surface 28a and the stepped portion 28b in a manner other than reaching the display light irradiation area 17a. In addition, although a portion of the illumination light Li that passes through the second biconvex lens 15, namely the light L4, can be irradiated by the opening 23c of the panel support housing 23, even if irradiated, it will be reflected by the inclined surface 23d and the stepped portion 23e in a manner other than reaching the display light irradiation area 17a. This can prevent the light reflected by the openings 23c and 28 from being mixed with the display light L that passes through the display panel 17, and can suppress the degradation of the display quality of the virtual image V displayed by the display light L.

[0127] (Effect)

[0128] According to the embodiment described above, the following effects are achieved.

[0129] (1) The display device 10 includes: a light source 11a that emits illumination light Li; a second lenticular lens 15, as an example of an optical element, that transmits the illumination light Li; a display panel 17, which includes a display light radiating area 17a that receives the illumination light Li transmitted through the second lenticular lens 15 and radiates display light L; and a second lens housing 22, as an example of a housing, which includes an opening 28 through which the illumination light Li passes and surrounds the outer periphery of the second lenticular lens 15. The opening 28 includes an inclined surface 28a formed on an opening end surface of the opening 28 and inclined relative to the optical axis center C of the illumination light Li, thereby reflecting the incident illumination light Li so as to reach the outside of the display light radiating area 17a.

[0130] According to this configuration, the inclined surface 28a can prevent the illumination light Li (light L1 to L3) reflected by the opening 28 from reaching the eye range of the viewer as the display light L. This can prevent the outer frame corresponding to the opening 28 from flickering noticeably relative to the displayed image, thereby suppressing a reduction in visibility.

[0131] In particular, the inclined surface 28a is inclined in a direction away from the optical axis center C as it advances in the light traveling direction of the illumination light Li. With this configuration, the illumination light Li reflected by the opening 28 can more reliably reach the outside of the display light emitting region 17a.

[0132] (2) The opening 28 includes the step portion 28 b formed in a concave shape at the edge of the opening 28 so that the length of the inclined surface 28 a in the direction of the optical axis center C becomes shorter.

[0133] According to this configuration, the area of ​​the end surface of the opening 28 that causes the outer frame of the displayed image can be reduced, and degradation of visibility can be suppressed.

[0134] Furthermore, by forming the step portion 28 b at the edge of the opening 28 , the second lens housing 22 does not need to be thinned as a whole, and the area of ​​the inclined surface 28 a can be reduced while ensuring the strength of the second lens housing 22 .

[0135] (3) The step portion 28b includes a first surface 28b1 extending from the lower end of the inclined surface 28a in the X direction intersecting the optical axis center C, and a second surface 28b2 extending from the end of the first surface 28b1 on the opposite side of the inclined surface 28a in the Z direction coinciding with the optical axis center C. The second surface 28b2 reflects the illumination light L1 and forms the reflected light L3 at a position farther from the optical axis center C than the inclined surface 28a in the X direction orthogonal to the optical axis center C so as to reach the first surface 28b1.

[0136] According to this configuration, since the light L3 reflected by the second surface 28b2 is less likely to reach the eye range of the viewer, it is possible to suppress a decrease in visibility.

[0137] (4) A parting line PL is formed at the end portion of the inclined surface 28 a close to the optical axis center C.

[0138] According to this configuration, the parting line PL can be made less noticeable, and stray light generated by the parting line PL can be suppressed.

[0139] (5) The head-up display device 100 includes the display device 10. The head-up display device 100 displays a virtual image V by projecting the display light L from the display device 10 onto the windshield 201 as an example of a projection target member.

[0140] According to this configuration, it is possible to suppress the outer frame from conspicuously appearing behind the virtual image V as the display image, and to suppress a reduction in the visibility of the virtual image V.

[0141] The present invention is not limited to the above embodiments and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present invention. An example of a modification is described below.

[0142] (Variation)

[0143] In the above embodiment, the step portion 28b is formed only on a pair of end surfaces of the opening 28 extending in the Y direction, but it may be formed on the entire circumferential end surface of the opening 28. Similarly, the step portion 23e may be formed on the entire circumferential end surface of the opening 23c.

[0144] In the above embodiment, the step portion 28b may be omitted. In this case, the inclined surface 28a may be formed over the entire range in the Z direction of the peripheral end surface of the opening 28. Similarly, the step portion 23e may be omitted.

[0145] In the above embodiment, the parting line PL is formed at the lower corners of the inclined surfaces 23d and 28a, but may be formed at other than the lower corners.

[0146] In the above embodiment, the openings 23c and 28 may be formed in a tapered shape such that the thickness of the peripheral edge of the openings 23c and 28 decreases toward the inner peripheral distal end (the distal end closer to the optical axis center C).

[0147] In the above embodiment, either the inclined surface 23d and the stepped portion 23e of the opening 23c or the inclined surface 28a and the stepped portion 28b of the opening 28 may be omitted. For example, when the inclined surface 23d and the stepped portion 23e are omitted, the peripheral end surface of the opening 23c is formed so as to extend in the Z direction without being inclined relative to the optical axis center C.

[0148] In the above embodiment, the first surface 28b1 and the second surface 28b2 of the step portion 28b are orthogonal to each other, but they do not need to be orthogonal to each other. Similarly, the first surface and the second surface of the step portion 23e do not need to be orthogonal to each other.

[0149] In the above embodiment, the openings 23 c and 28 having the inclined surfaces 28 a and 23 d and the stepped portions 28 b and 23 e can be applied to openings of other housings (including covers) besides the second lens housing 22 and the panel support housing 23 .

[0150] For example, the present invention can be applied to an opening (e.g., an opening of the cover 25) through which the display light L of the transmissive display panel 17 passes. In this case, the inclined surface of the opening reflects a portion of the display light L in a direction away from the optical axis center C so as not to reach the eye movement range of the visual observer.

[0151] In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. Furthermore, the projection target is not limited to the windshield, but may be a dedicated combiner.

[0152] The display device 10 in the above embodiment may be applied to other than the head-up display device 100 . For example, the display panel 17 may be directly observed by a viewer.

Claims

1. A display device, characterized in that: have: a light source that emits illuminating light; an optical element that transmits the illumination light; a display panel having a display light emitting area for receiving the illumination light transmitted through the optical element and emitting display light; as well as a housing having an opening for the illumination light to pass through and surrounding the outer periphery of the optical element; The opening has an inclined surface formed on an opening end surface thereof and inclined with respect to an optical axis center of the illumination light, so as to reflect the incident illumination light so as to reach outside the display light radiating area.

2. The display device according to claim 1, wherein The opening has a step portion formed in a concave shape at an edge of the opening so that the length of the inclined surface in the direction of the optical axis center becomes shorter.

3. The display device according to claim 2, wherein: The step portion has: a first surface extending from an end of the inclined surface in a direction intersecting the center of the optical axis; and a second surface extending from an end portion of the first surface opposite to the inclined surface in a direction aligned with the center of the optical axis; The second surface reflects the illumination light and forms the reflected light at a position farther from the optical axis center than the inclined surface in a direction perpendicular to the optical axis center so as to reach the first surface.

4. The display device according to claim 1, wherein A parting line is formed at an end portion of the inclined surface close to the center of the optical axis.

5. A head-up display device, characterized in that: The display device according to any one of claims 1 to 4 is provided, wherein a virtual image is displayed by projecting the display light from the display device onto a projection member.

Images