Display device and head-up display device

Abstract

To provide a display device and a head-up display device capable of suppressing a decrease in visibility.SOLUTION: A display device includes: a light source for emitting illumination light; a second lenticular lens 15 through which illumination light is transmitted; a display panel having a display light radiation area for radiating display light by receiving illumination light transmitted through the second lenticular lens 15; and a second lens housing case 22 that has an opening 28 through which illumination light is transmitted and surrounds an outer peripheral side of the second lenticular lens 15. The opening 28 has an incline 28a that is formed on an opening end face of the opening 28, is tilted relative to the center of a light axis of illumination light, and reflects pieces of light L1, L2 that are one portion of incident illumination light so as to reach the outside of the display light radiation area.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure 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 through which illumination light from the light source passes, a liquid crystal display panel that receives the illumination light passing through the plurality of lenses and emits display light, and a plurality of case bodies that surround the light source, the plurality of lenses, and the liquid crystal display panel from the outer periphery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration of Patent Document 1 above, the light from the light source passes through the openings of each case body. At these openings, a part of the light from the light source is reflected, and when this reflected light reaches the viewer's eye box, the frame portion corresponding to the opening is visually recognized, which may reduce the visibility.

[0005] The present disclosure has been made in view of the above actual situation, and an object thereof is to provide a display device and a head-up display device capable of suppressing a decrease in visibility.

Means for Solving the Problems

[0006] To achieve the above object, a display device according to a first aspect of the present disclosure includes a light source that emits illumination light, an optical element through which the illumination light passes, a display panel having a display light emission region that receives the illumination light passing through the optical element and emits display light A case having an opening through which the illumination light passes and surrounding the outer peripheral side of the optical element. The opening is formed on the opening end surface of the opening, is inclined with respect to the optical axis center of the illumination light, and includes an inclined surface that reflects the incident illumination light so as to reach outside the display light emission region.

[0007] To achieve the above object, a head-up display device according to a second aspect of the present disclosure includes the display device, and displays a virtual image by projecting the display light from the display device onto a projection member.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to suppress a decrease in visibility.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0010] An embodiment of a display device and a head-up display device according to the present disclosure will be described with reference to FIGS. 1 to 10. In the cross-sectional views of FIGS. 4 to 7, FIG. 9, and FIG. 10, some hatching is omitted.

[0011] As shown in FIG. 1, the head-up display device 100 is installed in the dashboard of the 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 is a front glass, and reaches the viewer 1 (mainly the driver of the vehicle 200). Thereby, the virtual image V is visibly displayed to the viewer 1.

[0012] As shown in FIG. 2, the head-up display device 100 includes a display device 10, a folding mirror 31, a concave mirror 32, and a housing 60.

[0013] 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.

[0014] 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 reflects the display light L reflected by the folding mirror 31 while expanding it toward the windshield 201. Note that the folding mirror 31 may be omitted.

[0015] The housing 60 is formed of a non-translucent resin or metal and has a substantially rectangular parallelepiped shape with a hollow interior. Each component of the head-up display device 100 is housed inside the housing 60. Specifically, the housing 60 includes an upper case 60a and a lower case 60b.

[0016] The lower case 60b is box-shaped and opens upward. A folding mirror 31 and a concave mirror 32 are housed inside the lower case 60b. A through hole 60h through which the display light L from the display device 10 passes is formed in the inner bottom wall of the lower case 60b. The display device 10 is provided on the bottom outer surface of the lower case 60b.

[0017] The upper case 60a functions as a lid that closes the upper opening of the lower case 60b. An opening 61 is formed in the upper case 60a at a position facing the windshield 201. The upper case 60a includes a curved plate-shaped window portion 50 that closes the opening 61. The window portion 50 is made of a light-transmitting resin such as acrylic through which the display light L passes.

[0018] Next, the display device 10 will be specifically described. As shown in FIGS. 4 and 5, the display device 10 includes a light source substrate 11 having a plurality of light sources 11a, a condenser lens 13, a first lenticular lens 14, a second lenticular lens 15, a diffuser 16, a display panel 17, a hot mirror 18, and a light box 19. In the following description, the light traveling direction of the illumination light Li emitted from the light source 11a is defined as the Z direction, and the directions orthogonal to the Z direction are defined as the X direction and the Y direction. The X direction and the Y direction are orthogonal to each other. In this example, the X direction is along the longitudinal direction of the first lenticular lens 14 etc., and the Y direction is along the short-side direction of the first lenticular lens 14 etc. Also, in the Z direction, the traveling direction of the illumination light Li is the upward direction, and the direction opposite to the optical path of the illumination light Li is the downward direction.

[0019] The light source substrate 11, the condenser lens 13, the first lenticular lens 14, the second lenticular lens 15, the diffuser 16, the display panel 17, and the hot mirror 18 are arranged in the Z direction with their respective thickness directions along the Z direction. They are arranged in the order of condenser lens 13 → first lenticular lens 14 → second lenticular lens 15 → diffuser 16 → display panel 17 → hot mirror 18 from the side closer to the light source substrate 11.

[0020] A plurality of light sources 11a emit illumination light Li under the control of a control unit (not shown). The light source 11a is, for example, an LED (Light Emitting Diode). The plurality of light sources 11a are mounted in a matrix on the upper surface of the light source substrate 11. The upper surface of the light source substrate 11 is the surface facing the condenser lens 13 of the light source substrate 11.

[0021] The condenser lens 13 is formed in a plate shape from a light-transmissive resin or glass. The condenser lens 13 has a function of substantially parallelizing each ray of the illumination light Li emitted from each light source 11a by causing the rays to follow the Z direction. The condenser lens 13 includes a plurality of convex lens portions 13a arranged in the X direction and the Y direction. Each convex lens portion 13a is formed in a biconvex lens shape. The plurality of convex lens portions 13a are respectively arranged to face the plurality of light sources 11a in the Z direction.

[0022] The first lenticular lens 14 is formed in a plate shape from a light-transmissive resin or glass. The first lenticular lens 14 has a function of diverging light in the Y direction in order to suppress the occurrence of unevenness in light intensity in the Y direction. Both the incident surface on which light enters the first lenticular lens 14 and the exit surface from which the light exits are formed in a cylindrical lens array shape in which semi-cylindrical members extending in the X direction are arranged along the Y direction.

[0023] The second lenticular lens 15 is formed in a plate shape from a light-transmissive resin or glass. The second lenticular lens 15 has a function of diverging the illumination light Li as divergent light in the X direction. The incident surface of the second lenticular lens 15 is formed in a cylindrical lens array shape in which semi-cylindrical members extending in the Y direction are arranged along the X direction. The exit surface of the second lenticular lens 15 is formed as a curved surface that is concave along the X direction.

[0024] The diffuser 16 is a diffusion plate that suppresses the occurrence of unevenness in light intensity, and scatters the illumination light Li that has passed through the second lenticular lens 15 and then radiates it toward the display panel 17.

[0025] The display panel 17 is a TFT (Thin Film Transistor) type liquid crystal display panel. The display panel 17 includes a display light emission region 17a and a bezel 17b. The display light emission region 17a has a rectangular shape, precisely a rectangular shape that is long in the X direction, and emits display light L by receiving illumination light Li transmitted through the diffuser 16 under the control of a control unit (not shown). The bezel 17b is a metal frame member that surrounds the outer peripheral side of the display light emission region 17a.

[0026] The hot mirror 18 transmits visible light and reflects infrared rays by providing a multilayer film on a transparent glass. The hot mirror 18 suppresses the temperature rise of the display panel 17 due to external light.

[0027] As shown in FIGS. 3 and 4, the light box 19 is formed in a cylindrical shape that extends in the Z direction so as to surround the outer periphery of the display device 10 with a light-shielding resin or metal. The light box 19 includes a plurality of cases 21, 22, 23, 24 and a cover 25. The plurality of cases 21, 22, 23, 24 and the cover 25 are each separate and are combined in the Z direction.

[0028] The first lens housing case 21 has a rectangular cylindrical shape that surrounds the periphery of the light source substrate 11 and the condenser lens 13. The first lens housing case 21 includes a plurality of locking convex portions 21a (see FIG. 3) and a lens support portion 21b (see FIG. 4). The plurality of locking convex portions 21a are formed on the outer peripheral surface of the first lens housing case 21. The lens support portion 21b has a rectangular frame shape so as to support the outer peripheral portion of the first lenticular lens 14 at the upper part inside the first lens housing case 21.

[0029] The second lens housing case 22 has a substantially rectangular cylindrical shape that covers the outer peripheral side of the second lenticular lens 15 and the outer peripheral side of the light emission surface of the second lenticular lens 15. As shown in FIG. 8, the second lens housing case 22 includes a main body cylindrical portion 22a, a hook 22b that is a locking portion, and a frame portion 22c. The main body cylindrical portion 22a has a rectangular cylindrical shape. A plurality of hooks 22b are provided on the outer surface of the main body cylindrical portion 22a facing downward.

[0030] The second lens housing case 22 is fixed to the first lens housing case 21 by the hook 22b, which is a locking portion, locking to the locking convex portion 21a (see FIG. 3), which is the locked portion of the first lens housing case 21.

[0031] The frame portion 22c is formed as a cut-off portion that hides the outer peripheral side of the upper surface of the second lenticular lens 15, and has an opening 28 through which the illumination light Li transmitted through the second lenticular lens 15 passes. As shown in FIGS. 6 and 8, the frame portion 22c includes an inclined portion 22d that inclines upward as it approaches the optical axis center C of the illumination light Li, and a flat portion 22e located closer to the optical axis center C of the inclined portion 22d. The optical axis center C is located at the center of a cross-section obtained by cutting the illumination light Li in a direction orthogonal to the light traveling direction, and coincides with the center of the opening 28. The flat portion 22e has a flat plate shape along the XY direction and has a rectangular frame shape that is long in the X direction. The opening 28 is formed on the inner peripheral side of the flat portion 22e. The opening 28 has a rectangular shape that is long in the X direction. More precisely, it has a rectangular shape with rounded corners.

[0032] As shown in FIGS. 6 and 7, the opening 28 includes an inclined surface 28a and a stepped portion 28b. The inclined surface 28a is formed over the entire circumferential direction of the end surface of the opening 28 and is located on the traveling side (upper side) of the illumination light Li with respect to the stepped portion 28b. The inclined surface 28a inclines outward away from the optical axis center C as it goes upward. The inclined surface 28a is set at an inclination 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.

[0033] Here, in the configuration 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 this end face reaches within the display light emission region 17a, and thus reaches the viewer's eye box as the display light L. As a result, the outer frame corresponding to the opening 28 shines conspicuously on the back side of the virtual image V as seen by the viewer, and the visibility of the virtual image V deteriorates. In this regard, in the present embodiment, as shown in FIG. 6, when the inclined surface 28a receives the leakage light L1, which is the leakage light of the illumination light Li irradiated outside the irradiation target region, the inclined surface 28a reflects the leakage light L1 outward away from the optical axis center of the illumination light Li so as to reach outside the display light emission region 17a of the display panel 17. In other words, the inclined surface 28a is formed at an inclination angle such that the light L1 reflected from the illumination light Li does not hit the diffuser 16, which is the next optical element. Thereby, it is suppressed that the light L1, which is the reflected light of the inclined surface 28a, reaches the viewer's eye box via the optical system (mirrors 31, 32, and windshield 201). Therefore, it is suppressed that the outer frame corresponding to the opening 28 shines conspicuously on the back side of the virtual image V, and a decrease in the visibility of the virtual image V can be suppressed.

[0034] The stepped portion 28b is formed below the inclined surface 28a of the opening 28. The stepped portion 28b is formed in a concave shape that opens in two directions, the direction toward the optical axis center C and the downward direction. The stepped portion 28b can reduce the thickness T1 in the direction along the optical axis center of the peripheral edge portion of the opening 28 and can reduce the area of the inclined surface 28a. That is, due to the stepped portion 28b, the thickness T1 of the peripheral edge portion of the opening 28 of the frame portion 22c is formed thinner than the thickness of the portion other than the opening 28 of the frame portion 22c. As shown in FIG. 9, the stepped portion 28b is formed on a pair of end faces extending in the Y direction of the opening 28 and is not formed on a pair of end faces extending in the X direction of the opening 28.

[0035] As shown in Fig. 7, the stepped portion 28b includes a first surface 28b1 and a second surface 28b2. The first surface 28b1 extends in a direction orthogonal to the optical axis center. The first surface 28b1 is continuous with the lower end of the inclined surface 28a and extends in a direction away from the optical axis center from this lower end. The first surface 28b1 reflects the illumination light Li and reflects the reflected light L2 (see Fig. 6) outward in the X direction with respect to the second lenticular lens 15.

[0036] The second surface 28b2 extends in the Z direction so as to be orthogonal to the first surface 28b1. The second surface 28b2 is continuous with the end portion far from the optical axis center of the first surface 28b1 and extends downward from this end portion. The second surface 28b2 reflects the illumination light Li, and is formed at a position separated in the X direction with respect to the optical axis center from the inclined surface 28a so that the reflected light L3 (see Fig. 7) reaches the first surface 28b1. A convex parting line PL is formed at the lower end corner of the inclined surface 28a. The parting line PL is a line formed at the position where a pair of molds (not shown) for injection molding the second lens housing case 22 are divided. The parting line PL is formed on the boundary line between the inclined surface 28a and the first surface 28b1. By forming the parting line PL at this position, the parting line PL is less conspicuous, and compared with the configuration in which the parting line PL is provided on the inclined surface 28a, it is possible to suppress a part of the illumination light Li from reaching the eye box due to the parting line PL. Thus, the description of the second lens housing case 22 is completed.

[0037] As shown in Figs. 4 and 5, the panel support case 23 has a rectangular tubular shape for housing the diffuser 16 and is installed on the upper surface of the frame portion 22c of the second lens housing case 22. As shown in Fig. 10, the panel support case 23 includes an installation surface 23a on which the display panel 17 is installed, a housing recess 23b in which the diffuser 16 is housed, and an opening 23c through which the illumination light Li passes. The installation surface 23a is located on the upper surface of the panel support case 23 and supports the bezel 17b on the outer peripheral side of the display panel 17 from below. The accommodation recess 23b is formed on the lower inner peripheral side of the installation surface 23a. The accommodation recess 23b is in a frame shape that accommodates the outer peripheral side of the diffuser 16. The installation surface 23a, the accommodation recess 23b, and the opening 23c are formed to be inclined with respect to the Y direction.

[0038] The opening 23c is formed on the lower inner peripheral side of the accommodation recess 23b. As shown in FIG. 5, the opening size of the opening 23c of the panel support case 23 is formed to be larger in the X direction and the Y direction than the opening size of the opening 28 of the second lens accommodation case 22 described above.

[0039] As shown in FIG. 10, the opening 23c includes an inclined surface 23d and a stepped portion 23e. The inclined surface 23d and the stepped portion 23e have the same functions and configurations as the inclined surface 28a and the stepped portion 28b described above. For example, the inclined surface 23d reflects a part of the illumination light Li, the light L4, so as to reach the bezel 17b outside the display light emission region 17a.

[0040] As shown in FIGS. 3 and 4, the panel pressing case 24 is in a rectangular tubular shape without a top, and presses the display panel 17 located on the installation surface 23a from above. A hot mirror 18 is installed on the upper surface of the panel pressing case 24 so as to face the display panel 17. The panel pressing case 24 is fixed to the panel support case 23 by a hook (not shown), which is a locking portion of the panel pressing case 24, locking to a locking convex portion (not shown), which is a locked portion of the panel support case 23.

[0041] The cover 25 is in a rectangular frame shape and covers the outer peripheral side of the upper surface of the hot mirror 18. The cover 25 is fixed to the panel pressing case 24 by a hook 25a, which is a locking portion of the cover 25, locking to a locking convex portion 24b, which is a locked portion of the panel pressing case 24.

[0042] Next, the operation of the display device 10 will be described. The illumination light Li emitted from each light source 11a is approximately parallelized by passing through the condenser lens 13, and most of the illumination light Li travels toward the diffuser 16 and the display panel 17. However, although light L1, L2, and L3, which are leakage light of the illumination light Li, may be irradiated to the opening 28 of the second lens housing case 22, even if it is irradiated, it is reflected by the inclined surface 28a and the step portion 28b so as to reach areas other than the display light emitting area 17a. Furthermore, although light L4, which is leakage light of the illumination light Li that has passed through the second lenticular lens 15, may be irradiated to the opening 23c of the panel support case 23, even if it is irradiated, it is reflected by the inclined surface 23d and the step portion 23e so as to reach areas other than the display light emitting area 17a. Therefore, the display light L that has passed through the display panel 17 is prevented from being mixed with the light reflected at the openings 23c and 28, and the deterioration of the display quality of the virtual image V displayed based on the display light L can be suppressed.

[0043] (effect) According to the embodiment described above, the following effects are achieved. (1) The display device 10 includes a light source 11a that emits illumination light Li, a second lenticular lens 15 that is an example of an optical element through which the illumination light Li passes, a display panel 17 that has a display light emission region 17a that receives the illumination light Li that has passed through the second lenticular lens 15 and emits display light L, and a second lens housing case 22 that has an opening 28 through which the illumination light Li passes and is an example of a case that surrounds the outer periphery of the second lenticular lens 15. The opening 28 includes an inclined surface 28a that is formed on an opening end surface of the opening 28, is inclined with respect to the optical axis center C of the illumination light Li, and reflects the incident illumination light Li so that it reaches the outside of the display light emission region 17a. According to this configuration, the inclined surface 28a prevents the illumination light Li (light L1 to L3) reflected at the opening 28 from reaching the viewer's eyebox as the display light L. This prevents the outer frame corresponding to the opening 28 from shining conspicuously against the display image, and thus prevents a decrease in visibility. In particular, the inclined surface 28a inclines in a direction away from the optical axis center C as it advances in the light traveling direction of the illumination light Li. According to this configuration, the illumination light Li reflected at the opening 28 can be made to reach the outside of the display light emission region 17a more reliably.

[0044] (2) The opening 28 includes a step portion 28b formed in a concave shape on the edge of the opening 28 so that the length of the inclined surface 28a in the direction of the optical axis center C is shortened. According to this configuration, the area of ​​the end face of the opening 28, which causes the outer frame of the display image, can be reduced, and a decrease in visibility can be suppressed. Furthermore, by forming step portion 28b on the edge of opening 28, there is no need to form second lens case 22 as a whole thin, and the strength of second lens case 22 is maintained while reducing the area of ​​inclined surface 28a.

[0045] (3) The step portion 28b includes a first surface 28b1 extending from a lower end of the inclined surface 28a in an X direction intersecting with the optical axis center C, and a second surface 28b2 extending from an end of the first surface 28b1 opposite the inclined surface 28a in a Z direction along the optical axis center C. The second surface 28b2 reflects the illumination light Li and is formed at a position farther away from the optical axis center C in the X direction perpendicular to the optical axis center C than the inclined surface 28a so that the reflected light L3 reaches the first surface 28b1. According to this configuration, the light L3 reflected by the second surface 28b2 is unlikely to reach the viewer's eyebox, so that a decrease in visibility can be suppressed.

[0046] (4) A parting line PL is formed at the end of the inclined surface 28a close to the optical axis center C. According to this configuration, the parting line PL is less noticeable, and the generation of stray light due to the parting line PL is suppressed.

[0047] (5) The head-up display device 100 includes a display device 10. The head-up display device 100 displays a virtual image V by projecting display light L from the display device 10 onto a windshield 201, which is an example of a projection target member. According to this configuration, the outer frame is prevented from conspicuously appearing on the rear side of the virtual image V, which is the displayed image, and a decrease in visibility of the virtual image V can be suppressed.

[0048] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) can be made as appropriate within the scope of the present disclosure. An example of a modification will be described below.

[0049] (Modification) In the above embodiment, the step portion 28b is formed only on a pair of end faces extending in the Y direction of the opening 28, but it may be formed on the entire peripheral end face of the opening 28. Similarly, the step portion 23e may be formed on the entire peripheral end face of the opening 23c.

[0050] In the above embodiment, the step portion 28b may be omitted. In this case, the inclined surface 28a may be formed over the entire area in the Z direction of the peripheral end surface of the opening 28. Similarly, the step portion 23e may be omitted. In the above embodiment, the parting line PL is formed at the lower end corners of the inclined surfaces 23d and 28a, but it may be formed at a location other than the lower end corners.

[0051] In the above embodiment, the openings 23c, 28 may be formed in a tapered shape such that the thickness of the periphery of the openings 23c, 28 becomes thinner toward the inner circumferential tip side (the tip side closer to the optical axis center C).

[0052] In the above embodiment, either the inclined surface 23d and the step portion 23e of the opening 23c or the inclined surface 28a and the step portion 28b of the opening 28 may be omitted. For example, when the inclined surface 23d and the step portion 23e are omitted, the peripheral end surface of the opening 23c is formed not inclined with respect to the optical axis center C so as to extend in the Z direction.

[0053] In the above embodiment, the first surface 28b1 and the second surface 28b2 of the step portion 28b are perpendicular to each other, but they may be non-perpendicular to each other. Similarly, the first surface 28b1 and the second surface 28b2 of the step portion 23e may be non-perpendicular to each other.

[0054] In the above embodiment, the openings 23c, 28 having the inclined surfaces 28a, 23d and the step portions 28b, 23e may be applied to openings of cases (including covers) other than the second lens housing case 22 and the panel support case 23. For example, it may be applied to an opening (for example, an opening of the cover 25) through which the display light L transmitted through the display panel 17 passes. In this case, the inclined surface of the opening reflects a part of the display light L in a direction away from the optical axis center C so that the reflected light does not reach the eyebox of the viewer.

[0055] 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. In addition, the projection member is not limited to the windshield, and may be a dedicated combiner. The display device 10 in the above embodiment may be applied to devices other than the head-up display device 100, and may be configured such that, for example, the display panel 17 is viewed directly by a viewer. [Explanation of symbols]

[0056] 1...Viewer 10...Display device 11...Light source board, 11a...Light source 13...condenser lens, 13a...convex lens portion 14…First lenticular lens 15…Second lenticular lens 16…Diffuser 17: display panel, 17a: display light emitting area, 17b: bezel 18…Hot mirror 19. Lightbox 21...first lens housing case, 21a...locking protrusion, 21b...lens support portion 22... second lens housing case, 22a... main body tube portion, 22b... hook, 22c... frame portion 22d...Slope part, 22e...Flat part 23... panel support case, 23a... installation surface, 23b... accommodation recess, 23c... opening, 23d... inclined surface, 23e... step portion 24: Panel retaining case, 24b: Locking protrusion 25…Cover, 25a…Hook 28: opening, 28a: inclined surface, 28b: step portion, 28b1: first surface, 28b2: second surface 31…Folding mirror 32…Concave mirror 50…Window section 60: housing, 60a: upper case, 60b: lower case, 60h: through hole, 61: opening 100...Head-up display device 200…Vehicle, 201…Windshield C…Optical axis center L…Display light Li…Illumination light L1~L4…Light V…Virtual image PL…Parting line

Claims

1. A light source that emits illumination light, an optical element through which the illumination light passes, a display panel having a display light emission region that receives the illumination light transmitted through the optical element and emits display light, a case that has an opening through which the illumination light passes and surrounds the outer peripheral side of the optical element, and the opening includes an inclined surface that is formed on the opening end surface of the opening, is inclined with respect to the optical axis center of the illumination light, and reflects the incident illumination light so as to reach outside the display light emission region. A display device.

2. The opening includes a stepped portion that is formed in a concave shape at an edge of the opening so that a length of the inclined surface in a direction of the optical axis center becomes shorter. The display device according to Claim 1.

3. The stepped portion includes a first surface that extends in a direction intersecting the optical axis center from an end of the inclined surface, and a second surface that extends in a direction along the optical axis center from an end of the first surface on a side opposite to the inclined surface, and the second surface is formed at a position that is farther from the optical axis center in a direction orthogonal to the optical axis center with respect to the optical axis center so that the illumination light is reflected and the reflected light reaches the first surface. The display device according to Claim 2.

4. A parting line is formed at an end of the inclined surface closer to the optical axis center. The display device according to Claim 1.

5. A head-up display device that includes the display device according to any one of Claims 1 to 4 and displays a virtual image by projecting the display light from the display device onto a projection member.

Images