Display device, head-up display, and mobile object

Abstract

This display device comprises: a display panel that displays video; a plurality of light sources that are arranged in a first direction orthogonal to the normal direction of the display panel; a light-guiding panel that has an emission surface on which light from the plurality of light sources is incident and from which the light is emitted toward the display panel; and a first optical member that is disposed between the display panel and the light-guiding panel, and has a first surface facing the emission surface of the light-guiding panel, a second surface located on the reverse side of the first surface and facing the display panel, and a cylindrical lens array provided on the second surface. The cylindrical lens array includes a plurality of cylindrical lenses arranged in the first direction.

Description

[Technical Field]

[0001] The present disclosure relates to a display device, a head-up display including the display device, and a mobile object including the head-up display. [Background technology]

[0002] Patent Document 1 discloses a head-up display that is mounted on a vehicle and includes a display device. Light (images) output from the head-up display are guided into the eyebox of the occupant (observer) through the windshield.

[0003] The head-up display device described in Patent Document 1 has an illumination device (backlight device) and a transmissive display panel (liquid crystal display panel) that displays images. The illumination device has multiple light sources (LEDs) arranged in a matrix. Light emitted from each light source passes through the display panel and reaches the eyebox. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-101056 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of the head-up display device described in Patent Document 1, when light reaching the eyebox enters the observer's eyes, the image visually perceived by the observer, i.e., the virtual image, may have periodic brightness unevenness corresponding to the arrangement pattern of the multiple light sources. In particular, the higher the output of the light source, the greater the degree of this periodic brightness unevenness.

[0006] Therefore, an object of the present disclosure is to suppress the occurrence of periodic luminance unevenness in an image visually recognized by an observer in a display device of a head-up display having a plurality of light sources. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, a display panel for displaying images; a plurality of light sources arranged in a first direction perpendicular to a normal direction of the display panel; a light guide panel having an exit surface that receives light from the plurality of light sources and emits the light toward the display panel; a first optical member disposed between the display panel and the light guide panel, the first optical member having a first surface facing an exit surface of the light guide panel, a second surface positioned on the opposite side of the first surface facing the display panel, and a cylindrical lens array provided on the second surface; A display device is provided, wherein the cylindrical lens array includes a plurality of cylindrical lenses aligned in the first direction.

[0008] According to another aspect of the present disclosure, A head-up display is provided having the display device described above.

[0009] According to yet another aspect of the present disclosure, the head-up display described above; and a windshield onto which the image output from the head-up display is projected. [Effects of the Invention]

[0010] According to the present disclosure, in a head-up display device having a plurality of light sources, it is possible to suppress the occurrence of periodic luminance unevenness in an image visually recognized by an observer. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a vehicle equipped with a head-up display according to an embodiment of the present disclosure; [Figure 2] 1 is a perspective view of a display device according to an embodiment of the present disclosure; [Figure 3] 3 is a cross-sectional view of the display device taken along line AA in FIG. 2. [Figure 4] 3 is a cross-sectional view of the display device taken along line BB in FIG. 2. [Figure 5A] A perspective view of two optical members viewed from the light guide panel side [Figure 5B] A perspective view of two optical members as seen from the display panel side [Figure 6] Diagram showing light propagation through a cylindrical lens array [Figure 7] FIG. 10 is a diagram showing the luminance distribution of a virtual image that is output from the display device according to the embodiment and is visually recognized by the observer due to light that reaches the eye box. [Figure 8] FIG. 10 is a diagram showing the luminance distribution of a virtual image visually recognized by a viewer due to light output from a display device according to Comparative Example 1 and reaching the eye box. [Figure 9] FIG. 10 is a diagram showing the luminance distribution of a virtual image that is output from a display device according to Comparative Example 2 and is visually recognized by a viewer due to light that reaches the eye box. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of well-known matters or redundant explanation of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0013] The inventor(s) provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims.

[0014] Display devices according to multiple embodiments of the present disclosure will be described below with reference to FIGS.

[0015] FIG. 1 is a schematic diagram of a vehicle equipped with a head-up display according to an embodiment of the present disclosure.

[0016] As shown in FIG. 1, a vehicle 10 is, for example, an automobile, and is equipped with a head-up display 14 that projects light (images) onto a transparent windshield 12, that is, onto the windshield.

[0017] Light (image) output from the head-up display 14 is guided through the windshield 12 into the eyebox EB of an observer Ob, such as a driver, riding in the vehicle 10. This allows the observer Ob to view a virtual image Iv. That is, the observer Ob views the scenery seen through the windshield 12 and the virtual image Iv superimposed on it. The eyebox EB is a spatial region in which the observer Ob can view the virtual image Iv without any loss.

[0018] The head-up display 14 has a housing 16. Inside the housing 16 are a display device 20 and multiple mirrors 22, 24 for guiding light (image) output from the display device 20 to the windshield 12. For example, a convex mirror 22 that reflects the light output from the display device 20 and a concave mirror 24 that reflects the light from the convex mirror 22 toward the windshield 12 are provided inside the housing 16. The windshield 12 and the multiple mirrors 22, 24 form a reflective optical system RS that guides the light output from the display device 20 to the eyebox EB of the observer Ob. Note that the reflective optical system RS from the display device 20 to the eyebox EB differs depending on the vehicle installation conditions of the head-up display 14.

[0019] Fig. 2 is a perspective view of a display device according to an embodiment of the present disclosure. Fig. 3 is a cross-sectional view of the display device taken along line AA in Fig. 2. Fig. 4 is a cross-sectional view of the display device taken along line BB in Fig. 2. Note that the XYZ coordinate system shown in the figures is intended to facilitate understanding of the present disclosure and does not limit the present disclosure.

[0020] As shown in FIGS. 2 and 3, the display device 20 according to this embodiment includes a display panel 30 that displays images, and an illumination device 32 that irradiates light toward the display panel 30.

[0021] In this embodiment, the display panel 30 is a transmissive liquid crystal panel. In this embodiment, the display panel 30 is rectangular with a short side direction S1 (Y-axis direction) and a long side direction S2 (X-axis direction). That is, the display panel 30 displays an image with a short side direction and a long side direction.

[0022] The illumination device 32 has a plurality of light sources 34 and a light guide panel 36 that guides light emitted from the plurality of light sources 34 toward the display panel 30. The plurality of light sources 34 are arranged in a direction (first direction) perpendicular to the normal direction N of the display panel 30, that is, in this embodiment, in the longitudinal direction S2 (X-axis direction) of the display panel 30.

[0023] In this embodiment, the plurality of light sources 34 are LEDs. The number of light sources is not limited to six as shown in Fig. 2, but may be two to five or seven or more depending on the circumstances.

[0024] The light guide panel 36 is a panel-shaped member made of a transparent material, such as a resin material. Specifically, the light guide panel 36 includes an incident surface 36a facing the plurality of light sources 34, an exit surface 36b facing the display panel 30, and a reflecting surface 36c facing the exit surface 36b. In this embodiment, the incident surface 36a is adjacent to the exit surface 36b and perpendicular (at an angle of 85 to 95 degrees).

[0025] 2 and 3, in this embodiment, each of the plurality of light sources 34 faces the incident surface 36a of the light guide panel 36 in the widthwise direction S1 (Y-axis direction) of the display panel 30. The plurality of light sources 34 are also arranged in the longitudinal direction S2 (X-axis direction) of the display panel 30 along the incident surface 36a. Light emitted from each of the plurality of light sources 34 enters the light guide panel 36 via the incident surface 36a. The entering light is reflected multiple times by the exit surface 36b and the reflecting surface 36c, and finally exits from the exit surface 36b.

[0026] The exit surface 36b of the light guide panel 36 faces the display panel 30. In the present embodiment, the display panel 30 is disposed parallel to the exit surface 36b of the light guide panel 36. The light emitted from the exit surface 36b passes through the display panel 30 and finally reaches the eyebox EB of the observer Ob.

[0027] Furthermore, in this embodiment, the display device 20 has two optical members 38 and 40 between the display panel 30 and the light guide panel 36.

[0028] Fig. 5A is a perspective view of two optical members as viewed from the light guide panel side, and Fig. 5B is a perspective view of two optical members as viewed from the display panel side.

[0029] In this embodiment, as shown in FIG. 2, the display panel 30 emits light L (image light) not in the normal direction N (Z-axis direction) but in a direction tilted relative to the normal direction N. Specifically, as shown in FIG. 3, the display panel 30 emits light Lc in a direction tilted at a first angle θ relative to the normal direction N when viewed in the longitudinal direction S2 (X-axis direction) of the display panel 30. At the same time, as shown in FIG. 4, the display panel 30 emits light Lc in a direction tilted at a second angle φ relative to the normal direction N when viewed in the lateral direction S1 (Y-axis direction) of the display panel 30. This light Lc is light that, within the entire light L traveling from the display panel 30 toward the eyebox EB, travels from the center of the transmission area of ​​the display panel 30 toward the center of the eyebox EB (e.g., the center of both eyes of a driver sitting in the driver's seat). The "transmission area" referred to here is an area through which light can pass and through which an image (picture) is formed. That is, the illumination device 32 emits light L toward the display panel 30 at such an inclination angle with respect to the normal direction N. This inclination angle can prevent external light, such as sunlight, from being reflected by the display panel 30, traveling along the optical path of the light L from the illumination device 32, and finally reaching the eyebox EB.

[0030] To this end, the illumination device 32 has an optical member (second optical member) 38 that emits light Lc at a first angle θ with respect to the normal direction N of the display panel 30 when viewed in the longitudinal direction S2 (X-axis direction) of the display panel 30. The illumination device 32 also has an optical member (first optical member) 40 that emits light Lc at a second angle φ with respect to the normal direction N of the display panel 30 when viewed in the lateral direction S1 (Y-axis direction) of the display panel 30.

[0031] One optical member 38 is a panel-shaped member made of a transparent material, such as a resin material, etc. The optical member 38 is disposed between the display panel 30 and the light guide panel 36, and receives light L emitted from the exit surface 36b of the light guide panel 36.

[0032] 3 and 5A, the optical member (second optical member) 38 has a prism array 38a provided on a surface facing the exit surface 36b of the light guide panel 36. The prism array 38a includes a plurality of prisms 38b arranged in parallel in the short-side direction S1 (Y-axis direction) of the display panel 30 when viewed in the normal direction N (Z-axis direction) of the display panel 30. The plurality of prisms 38b are arranged at a pitch that is sufficiently large with respect to the wavelength of the light L and at an equal pitch.

[0033] The optical member 38 receives light L from the exit surface 36b of the light guide panel 36 via the prism array 38a, and emits the light L from the exit surface 38c facing the display panel 30 at a first angle θ. The prisms 38b of the prism array 38a are optically designed to enable emission at this first angle θ. The absolute value of the first angle θ required for light Lc traveling from the center Cd of the transmission area of ​​the display panel 30 toward the center of the eyebox EB is, for example, within the range of 0°<|θ|≦45°.

[0034] The other optical member (first optical member) 40 is a panel-shaped member made of a transparent material, such as a resin material, etc. The optical member 40 is disposed between the display panel 30 and the optical member 38, and the light L emitted from the optical member 38 is incident on the optical member 40.

[0035] Furthermore, as shown in FIG. 5A, the optical member 40 has a Fresnel lens 40a provided on a first surface thereof facing the exit surface 36b of the light guide panel 36 via the optical member 38, i.e., facing the exit surface 38c of the optical member 38.

[0036] In the present embodiment, the center Cf of the circle of the Fresnel lens 40a is offset from the center Cd of the transmissive area of ​​the display panel 30 in the normal direction N of the display panel 30 (as viewed in the Z-axis direction). Specifically, the center Cf of the Fresnel lens 40a is offset by an offset amount D from the center Cd of the display panel 30 in the longitudinal direction S2 of the display panel 30 (as viewed in the X-axis direction). Due to this center offset, the optical member 40 emits light L in a direction tilted at a second angle φ with respect to the normal direction N of the display panel 30 when viewed in the short-side direction S1 of the display panel 30 (as viewed in the Y-axis direction). Strictly speaking, the optical member 40 emits light Lc, which is light that travels from the center Cd of the transmissive area of ​​the display panel 30 toward the center of the eyebox EB, at the second angle φ with respect to the normal direction N.

[0037] In the present embodiment, when viewed in the normal direction N (viewed in the Z-axis direction) of the display panel 30, the center Cf of the Fresnel lens 40a is offset from the geometric center of the optical member 40. As shown in FIG. 5A , the center Cf of the Fresnel lens 40a may be located on the optical member 40, or alternatively, may be located outside the optical member 40.

[0038] The Fresnel lens 40a is optically designed based on the required second angle φ and the focal length F of the Fresnel lens. Specifically, the amount of deviation D (center deviation) between the center Cf of the Fresnel lens 40a and the center Cd of the display panel 30 is determined.

[0039] The relationship between the second angle φ, the center shift amount D, and the focal length F can be expressed by the following equation 1.

number

[0040] Furthermore, in this embodiment, as shown in FIG. 5B , the optical member 40 includes a cylindrical lens array 40b on a second surface located opposite the first surface and facing the display panel 30. The cylindrical lens array 40b includes a plurality of cylindrical lenses 40c arranged in the same direction as the plurality of light sources 34, i.e., in the longitudinal direction S2 (X-axis direction) of the display panel 30. Each of the cylindrical lenses 40c extends in the lateral direction S1 (Y-axis direction) of the display panel 30. The number of the plurality of cylindrical lenses 40c is greater than the number of the plurality of light sources 34, and they are arranged in parallel at a narrow pitch, for reasons that will be described later. The role of this cylindrical lens array 40b will now be described.

[0041] FIG. 6 is a diagram showing the propagation of light through a cylindrical lens array.

[0042] As shown in FIG. 6, light L from the light guide panel 36 that has passed through the optical member 38 enters the cylindrical lens array 40b provided on the optical member 40 so as to face the display panel 30 while overlapping with one another, and is then diffused and emitted toward the display panel 30. In other words, the light emitted from each of the multiple cylindrical lenses 40c can be regarded as a surface light source with a more uniform spatial distribution in the cylindrical lens array 40b, and the light emitted from the cylindrical lens array 40b passes through the display panel 30. This prevents a periodic brightness unevenness pattern corresponding to the arrangement pattern of the multiple light sources 34 from occurring in the light L (image light) that the observer Ob views due to the light reaching the eyebox EB, i.e., in the virtual image Iv. This will be described in detail.

[0043] FIG. 7 is a diagram showing the luminance distribution of a virtual image visually recognized by a viewer by light output from the display device according to the example and reaching the eyebox.

[0044] FIG. 8 is a diagram showing the luminance distribution of a virtual image visually recognized by a viewer by light output from the display device according to Comparative Example 1 and reaching the eyebox.

[0045] FIG. 9 is a diagram showing the luminance distribution of a virtual image visually recognized by a viewer by light output from a display device according to Comparative Example 2 and reaching the eyebox.

[0046] 7 to 9 show the luminance distribution of the virtual image Iv when the eyes of the observer Ob are located in the central region, left region, and right region of the eyebox EB, respectively. Furthermore, the left-right direction of the virtual image Iv corresponds to the direction in which the multiple light sources are arranged side by side (X-axis direction), which corresponds to the longitudinal direction of the display panel in this embodiment. Furthermore, in the luminance distribution, the luminance increases in the black part at the center of the screen, the white part, and the gray part at the periphery of the screen, in that order.

[0047] The luminance distribution shown in Figure 7 is the luminance distribution of an image (light) that is viewed by an observer in the eyebox by light output from a display device of an embodiment having nine light sources and in which an optical element arranged between a display panel and a light guide panel is provided with a cylindrical lens array on the display panel side. In the display device of this embodiment, the nine light sources and the multiple cylindrical lenses of the cylindrical lens array are aligned in the longitudinal direction of the display panel.

[0048] 8 is the luminance distribution of an image (light) visually recognized by an observer in the eyebox by light output from a display device of Comparative Example 1, which has nine light sources and no optical member disposed between the display panel and the light guide panel, i.e., no cylindrical lens array is present between them. In the display device of Comparative Example 1, the nine light sources are aligned in the longitudinal direction of the display panel.

[0049] 9 is the luminance distribution of an image (light) visually recognized by an observer in the eyebox by light output from a display device of Comparative Example 2, which has nine light sources, no optical member disposed between the display panel and the light guide panel, and a cylindrical lens array provided on the exit surface of the light guide panel. In the display device of Comparative Example 2, the nine light sources and the multiple cylindrical lenses of the cylindrical lens array are aligned in the longitudinal direction of the display panel.

[0050] 8, in the case of the display device of Comparative Example 1 without a cylindrical lens array, multiple high-brightness areas are periodically distributed in the left-right direction of the virtual image Iv at a pitch corresponding to the arrangement pattern of the nine light sources, i.e., the arrangement pitch of the light sources. In particular, multiple high-brightness areas occurring at a constant pitch in the left-right direction of the virtual image Iv viewed in the right and left regions of the eye box, i.e., periodic brightness unevenness, are clearly visible.

[0051] In contrast, as shown in FIG. 7, in the display device of the example, unlike Comparative Example 1 shown in FIG. 8, the high-brightness areas are not divided into multiple areas. In other words, the high-brightness areas are distributed as a single mass. This is because the light from each light source overlaps and enters the cylindrical lens array, and the light is diffused by the cylindrical lens array, allowing the cylindrical lens surface to be regarded as a surface light source with a uniform spatial distribution. As a result, the occurrence of periodic brightness unevenness in the image viewed by the observer due to the light reaching the eyebox is suppressed.

[0052] As shown in FIG. 9, the luminance distribution of the eyebox in Comparative Example 2, in which a cylindrical lens array is provided on the exit surface of the light guide panel, is intermediate between the luminance distribution of the example shown in FIG. 7 and the luminance distribution of Comparative Example 1 shown in FIG. 8. Compared to Comparative Example 1, which does not have a cylindrical lens array, Comparative Example 2 suppresses periodic luminance unevenness, but not to the same extent as the example. This is because the position on the optical path where the cylindrical lens array is provided is close to the light source, so the light does not overlap sufficiently on the surface of the cylindrical lens array, and the light source can be regarded as having an uneven spatial distribution. In contrast, in the example shown in FIG. 7, the cylindrical lens array is provided on an optical component disposed between the light guide panel and the display panel, so it is positioned far from the light source, and the light from the light source overlaps sufficiently on the surface of the cylindrical lens array, so the light source can be regarded as having a more uniform spatial distribution.

[0053] Furthermore, when a Fresnel lens 40a is present between the light guide panel 36 and the display panel 30 as shown in Fig. 4, providing a cylindrical lens array on the light guide panel as in Comparative Example 2 results in a loss of light. That is, if light is diffused by the cylindrical lens array before entering the Fresnel lens, the amount of light entering the sag of the Fresnel lens increases. The light that enters the sag is not utilized, resulting in a reduction in brightness.

[0054] According to the present embodiment as described above, in the display device 20 of the head-up display having a plurality of light sources 34, it is possible to suppress the occurrence of periodic luminance unevenness in the image visually recognized by the observer.

[0055] Although the present disclosure has been described above with reference to the above-described embodiments, the present disclosure is not limited to these embodiments.

[0056] 3, due to the prism array 38a of the optical member 38, the light L emitted from the display panel 30 is emitted at a first angle θ with respect to the normal direction N of the display panel 30 when viewed in the longitudinal direction S2 (X-axis direction) of the display panel 30. Also, as shown in FIG. 4, due to the Fresnel lens 40a of the optical member 40, the light L emitted from the display panel 30 is emitted at a second angle φ with respect to the normal direction N of the display panel 30 when viewed in the lateral direction S1 (Y-axis direction) of the display panel 30. However, the embodiments of the present disclosure are not limited to this.

[0057] For example, the center Cf of the circle of the Fresnel lens 40a is offset in the longitudinal direction S2 (X-axis direction) of the display panel 30 with respect to the center Cd of the transmissive region of the display panel 30. In addition to this, or instead of this, the center Cf may be offset in the lateral direction S1 (Y-axis direction). In this way, the first angle θ may be realized by the prism array 38a of the optical member 38 and the Fresnel lens 40a of the optical member 40.

[0058] Furthermore, if the display panel 30 emits light at a first angle θ with respect to the normal direction N when viewed in its longitudinal direction S2 (X-axis direction), and the light guide panel 36 emits light at an angle substantially the same as the first angle θ when viewed in the same direction, the prism array 38a, i.e., the optical member 38, can be omitted. Additionally or alternatively, if the display panel 30 does not need to emit light at a second angle φ with respect to the normal direction N when viewed in its lateral direction S1 (Y-axis direction), the Fresnel lens 40a can be omitted. In this case, the incident surface of the optical member 40 (the surface on the optical member 38 side) is made flat.

[0059] 3 and 4, in the above-described embodiment, the display panel 30 is parallel to the exit surface 36b of the light guide panel 36. However, the embodiment of the present disclosure is not limited to this. For example, the display panel 30 may be tilted with respect to the exit surface 36b of the light guide panel 36. This makes it possible to achieve at least a portion of at least one of the first angle θ and the second angle φ.

[0060] Furthermore, in the above-described embodiment, the plurality of light sources 34 are arranged in the longitudinal direction S2 (X-axis direction) of the display panel 30, as shown in Fig. 2. However, the embodiment of the present disclosure is not limited to this. The plurality of light sources 34 may also be arranged in the lateral direction S1 (Y-axis direction) of the display panel 30.

[0061] Furthermore, in the above-described embodiment, as shown in FIG. 1, the head-up display 14 is mounted on a vehicle 10 such as an automobile. However, the moving body on which the head-up display is mounted is not limited to a vehicle. The moving body may be a vehicle on which people ride, such as an airplane or a ship. The moving body may also be an unmanned aircraft. The moving body may not be a moving body, but may be one that moves in place (for example, one that vibrates).

[0062] As described above, several embodiments have been described as examples of the technology in this disclosure, and for that purpose, the accompanying drawings and detailed descriptions have been provided.

[0063] Therefore, the components shown in the accompanying drawings and detailed description may include not only essential components for solving the problem, but also components that are not essential for solving the problem in order to illustrate the technology. Therefore, the fact that these non-essential components are shown in the accompanying drawings or detailed description should not be interpreted as indicating that these non-essential components are essential.

[0064] Furthermore, since the above-described embodiments are intended to illustrate the technology of the present disclosure, various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0065] The present disclosure is applicable to a display device, and also to a head-up display.

Claims

1. a display panel for displaying images; a plurality of light sources arranged in a first direction perpendicular to a normal direction of the display panel; a light guide panel having an exit surface that receives light from the plurality of light sources and emits the light toward the display panel; a first optical member disposed between the display panel and the light guide panel, the first optical member including a first surface facing an exit surface of the light guide panel, a second surface positioned on the opposite side of the first surface facing the display panel, a Fresnel lens provided on the first surface, and an optical array provided on the second surface; the optical array diffuses light toward the display panel; a Fresnel lens configured to emit light that passes through a center of the display panel in a direction inclined with respect to the normal direction when viewed in at least one of the first direction and a second direction that is orthogonal to both the normal direction and the first direction.

2. 2. The display device according to claim 1, wherein, when viewed in a normal direction of the display panel, a center of the transmissive region of the display panel and a center of the Fresnel lens are shifted in at least one of the first direction and a second direction orthogonal to both the normal direction and the first direction.

3. 3. The display device according to claim 2, wherein, when viewed in the second direction, Formula 1 is satisfied, where F is a focal length of the Fresnel lens, D is an amount of deviation between a center of the transmissive region of the display panel and a center of the Fresnel lens, and φ is an angle with respect to the normal direction of light passing through the center of the transmissive region of the display panel, which is caused by the deviation between the center of the transmissive region of the display panel and the center of the Fresnel lens. [Equation 1]

4. a second optical member disposed between the light guide panel and the first optical member, the second optical member having a prism array on a surface facing the light exit surface of the light guide panel; 4. The display device according to claim 1, wherein the prism array includes a plurality of prisms arranged side by side in a second direction perpendicular to both the normal direction and the first direction when viewed in the normal direction of the display panel.

5. The display device according to claim 1 , wherein the optical array includes a plurality of cylindrical lenses aligned in the first direction.

6. a display panel for displaying images; a light source unit that emits light in a planar manner toward the display panel; a first optical member disposed between the display panel and the light source unit, the first optical member including a first surface on which light from the light source unit is incident, a second surface located on the opposite side of the first surface and facing the display panel, a Fresnel lens provided on the first surface, and an optical array provided on the second surface; the optical array diffuses light toward the display panel; a Fresnel lens configured to emit light that passes through a center of the display panel in a direction inclined with respect to the normal direction when viewed in at least one of a first direction orthogonal to a normal direction of the display panel and a second direction orthogonal to both the normal direction and the first direction.

7. A head-up display comprising the display device according to any one of claims 1 to 6.

8. A head-up display according to claim 7; a windshield onto which the image output from the head-up display is projected.

Images