Display device and head-up display device

Abstract

The invention provides a display device and a head-up display device, which can restrain reduction of display uniformity of a display area. A display device (20) is provided with: a backlight device (50) having a plurality of light sources (60) arranged two-dimensionally and a plurality of optical elements (70) in one-to-one correspondence with the plurality of light sources; and a display panel (40) that outputs an image on the basis of the light emitted from the backlight device. Each of the plurality of optical elements has a positive power. The plurality of optical elements includes an outer optical element (72) located at least in a portion of an outer peripheral region (52) in a region in which the plurality of optical elements are disposed, and an inner optical element (71) located further inward than the outer optical element. The power of the outer optical element is different from the power of the inner optical element.

Description

Display device and head-up display device Technical Field

[0001] This disclosure relates to a display device and a head-up display device. Background Technology

[0002] Conventionally, display devices for head-up display (HUD) devices are known. The display device outputs an image displayed on a display panel to the outside, and the HUD displays a virtual image of the image output from the display device on the vehicle's windshield (front glass) in a manner superimposed on the scenery in front of the vehicle. Patent Document 1 discloses a liquid crystal display device as an example of such a display device.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 7231832 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] For example, when conventional display devices are used in head-up display systems in vehicles, images are sometimes difficult to display in a portion of the display area, resulting in reduced display uniformity.

[0008] This disclosure provides a display device, etc., capable of suppressing the reduction of display uniformity in the display area.

[0009] Solution for solving the problem

[0010] One aspect of this disclosure relates to a display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein each of the plurality of optical elements has a positive focal length, the plurality of optical elements includes outer optical elements and inner optical elements, the outer optical elements being located in at least a portion of the outer peripheral region of the area in which the plurality of optical elements are disposed, the inner optical elements being located inwardly than the outer optical elements, and the focal length of the outer optical elements being different from that of the inner optical elements.

[0011] One aspect of this disclosure relates to a display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein each of the plurality of optical elements has a positive focal length, the plurality of optical elements includes outer optical elements and inner optical elements, the outer optical elements being located in at least a portion of the outer peripheral region of the area in which the plurality of optical elements are disposed, the inner optical elements being located inwardly than the outer optical elements, and the distance between the optical axis of the outer optical element and the optical axis of the inner optical element adjacent to the outer optical element being different from the distance between the optical axes of two adjacent inner optical elements.

[0012] One aspect of this disclosure relates to a display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein each of the plurality of optical elements has a positive focal length, the plurality of light sources includes an outer light source and an inner light source, the outer light source being disposed in at least a portion of the outer peripheral region of the area in which the plurality of light sources are disposed, the inner light source being disposed in a position further inward than the outer light source, and the light emission size of the outer light source being different from that of the inner light source.

[0013] One aspect of this disclosure relates to a head-up display device that is equipped with the aforementioned display device.

[0014] The effects of the invention

[0015] According to one aspect of the present disclosure, the display device, etc., can suppress the reduction of display uniformity in the display area. Attached Figure Description

[0016] Figure 1 is a diagram showing the backlight device and display panel included in the display device of Comparative Example 1.

[0017] Figure 2 is a diagram showing an example of the display area of ​​a display device mounted on a first vehicle.

[0018] Figure 3 is a diagram showing an example of the display area of ​​a display device mounted on a second vehicle.

[0019] Figure 4 is a diagram showing an example of the display area of ​​the display device of Comparative Example 2.

[0020] Figure 5 is a diagram showing the backlight device and display panel included in the display device of this disclosure.

[0021] Figure 6 is a diagram showing an example of the display area of ​​the display device of this disclosure.

[0022] Figure 7 is a diagram showing a vehicle equipped with the head-up display device according to Embodiment 1.

[0023] Figure 8 is a diagram showing the area of ​​the windshield through which a HUD image is displayed by the head-up display device according to Embodiment 1.

[0024] Figure 9 is a diagram showing the structure of the head-up display device according to Embodiment 1.

[0025] Figure 10 is a diagram showing the backlight device and display panel included in the display device of Embodiment 1.

[0026] Figure 11 is a diagram showing the outer optical elements included in the backlight device of Embodiment 1.

[0027] Figure 12 is a diagram showing the outer optical element included in the backlight device of a variation of Embodiment 1.

[0028] Figure 13 is a diagram showing the backlight device and display panel included in the display device of Modification 2 of Embodiment 1.

[0029] Figure 14 is a diagram showing the outer light source and outer optical elements included in the backlight device of Modification 2 of Embodiment 1.

[0030] Figure 15 is a diagram showing the backlight device and display panel included in the display device of Modification 3 of Embodiment 1.

[0031] Figure 16 is a diagram showing the outer light source included in the backlight device of Modification 3 of Embodiment 1.

[0032] Figure 17 is a diagram showing the backlight device and display panel included in the display device of Modification 4 of Embodiment 1.

[0033] Figure 18 is a diagram showing the outer optical element included in the backlight device of Modification 4 of Embodiment 1.

[0034] Figure 19 is a top view showing the backlight device of Comparative Example 3.

[0035] Figure 20 is a top view showing the backlight device of Comparative Example 4.

[0036] Figure 21 is a top view of a backlight device according to a variation 5 of embodiment 1.

[0037] Figure 22 is a top view of a backlight device according to a variation of Embodiment 1, Example 6.

[0038] Figure 23 is an enlarged view of the optical elements on the outside of the backlight device of Modification 6 of Embodiment 1.

[0039] Figure 24 is a diagram showing the curvature of the outer periphery of the optical element on the outer side of the modified example 6 of embodiment 1.

[0040] Figure 25 is a top view of a backlight device according to a variation 7 of embodiment 1.

[0041] Figure 26 is a top view of a backlight device according to a variation 8 of Embodiment 1.

[0042] Figure 27 is a diagram showing the backlight device and display panel included in the display device of Embodiment 2.

[0043] Figure 28 is a diagram showing the backlight device and display panel included in a modified example of embodiment 2.

[0044] Figure 29 is a side view of the display device of Embodiment 3.

[0045] Figure 30 is a diagram showing the types of angle-adjusting lenses included in the display device of Embodiment 3.

[0046] Figure 31 is a diagram of the display device of Modified Example 1 of Embodiment 3 viewed from the side.

[0047] Figure 32 is a diagram of the display device of Modified Example 2 of Embodiment 3, viewed from the side.

[0048] Figure 33 is a diagram showing a portion of the angle adjustment lens of Modification 2 of Embodiment 3. Detailed Implementation

[0049] (Thinking back to the process of this public disclosure)

[0050] The process of conceiving this disclosure will be described with reference to Figures 1 to 6. In this disclosure, a display device used in a head-up display device for vehicles will be described. Hereinafter, a head-up display (HUD) will sometimes be referred to as a head-up display.

[0051] Figure 1 is a diagram showing the backlight device 150 and display panel 140 included in the display device 120 of Comparative Example 1.

[0052] Figure 1(a) shows a top view of the display device 120, and (b) shows a side view of the display device 120. In Figure 1, the shaded lines of the components are omitted. The shaded lines of the components will also be omitted in the following figures. Furthermore, in the following figures, the horizontal direction of the display panel 140 is defined as the X-axis, the vertical direction as the Y-axis, and the thickness direction as the Z-axis.

[0053] As shown in FIG1, the display device 120 of Comparative Example 1 includes a backlight device 150 and a display panel 140 that outputs an image based on light emitted from the backlight device 150. In FIG1(a), the illumination area L of the backlight device 150 is represented by dotted shading.

[0054] To achieve power saving and improved contrast in the HUD device, a local dimming function is required in the display device 120. Local dimming refers to dividing the display area of ​​the display device 120 into multiple areas and adjusting the brightness of these multiple areas in conjunction with the brightness of the image. For local dimming, the backlight device 150 consists of multiple light sources 160 arranged in a two-dimensional pattern and multiple lenses 170 corresponding one-to-one with the multiple light sources 160. The display panel 140 consists of a liquid crystal panel or the like that allows light to pass through.

[0055] A HUD device is a device that displays a virtual image of an image output from a display device 120 onto the windshield of a vehicle in a manner that overlays it onto the view in front of the vehicle. Specifically, the HUD device projects the image output from the display device 120 onto the angled windshield by reflection from a mirror or similar object. Therefore, when, for example, a rectangular image is output from the display device 120, the image projected onto the windshield may sometimes be trapezoidal.

[0056] Figure 2 is a diagram showing an example of the display area E of the display device 120 mounted on the first vehicle.

[0057] Furthermore, Figure 2 also shows the display area E0, which is capable of displaying images of a predetermined display quality or higher. The shape of the display area E varies depending on the vehicle model, and therefore the display area E is formed further inward than the displayable area E0. In addition, vehicle models also include those resulting from model changes.

[0058] Figure 2 illustrates an example of using display device 120 to perform trapezoidal correction so that the image projected onto the windshield is not trapezoidal. For example, display device 120 alters the shape of display area E so that the image output from display device 120 becomes a trapezoidal shape inverted from the image projected onto the windshield (e.g., a trapezoid with the top and bottom edges inverted). In other words, display device 120 alters the shape of display area E so that the image output from display device 120 becomes a vertically flipped or horizontally flipped shape inverted from the image projected onto the windshield. In this example, display area E is approximately aligned with the illumination area L of backlight device 150, and the image displayed in display area E is appropriately projected onto the windshield.

[0059] Generally speaking, the shape of the windshield and the location of the display device 120 vary from vehicle to vehicle model, so the shape of the display area E of the display device 120 needs to be changed for each vehicle model.

[0060] Figure 3 is a diagram showing an example of the display area E of the display device 120 mounted on the second vehicle. Furthermore, the model of the second vehicle is different from that of the first vehicle.

[0061] Figure 3 also shows an example of using display device 120 for trapezoidal correction to prevent the image projected onto the windshield from being trapezoidal. However, in this example, a portion of the display area E (the area surrounded by the ellipse) extends beyond the illumination area L of the backlight device 150. Therefore, light emitted from the backlight device 150 has difficulty entering this portion of the display area E, making it difficult for the image in that portion of the display area E to be projected onto the windshield. Thus, in the display device 120 of Comparative Example 1, the display uniformity of the display area E sometimes decreases depending on the vehicle model.

[0062] Figure 4 is a diagram showing an example of the display area E of the display device 120 of Comparative Example 2.

[0063] Figure 4 illustrates the following example: To align the illumination area L of the backlight device 150 with the display area E, the number of light sources 160 and lenses 170 in the backlight device 150 is increased. However, increasing the number of light sources 160 leads to an increase in heat generation in the display device 120. Furthermore, increasing the number of light sources 160 and lenses 170 also increases the number of components and manufacturing time.

[0064] Therefore, in this disclosure, a display device 20 is provided that can suppress the reduction of display uniformity in the display area E without increasing the number of light sources and lenses.

[0065] Figure 5 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20 of this disclosure. Figure 5(a) shows a top view of the display device 20, and (b) shows a view of the display device 20 viewed from the side.

[0066] As shown in FIG5, the display device 20 of this disclosure includes a backlight device 50 and a display panel 40 that outputs an image based on light emitted from the backlight device 50. The backlight device 50 is composed of a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The optical elements 70 are, for example, lenses or reflectors.

[0067] In this disclosure, the shape and configuration of the optical elements 70 and light sources 60 disposed in the outer peripheral region 52 of the region where multiple optical elements 70 and multiple light sources 60 are disposed are different from the shape and configuration of the optical elements 70 and light sources 60 disposed in the inner region 51 of the backlight device 50, thereby suppressing the reduction of light amount at the outer periphery of the display area E.

[0068] Figure 6 is a diagram showing an example of the display area E of the display device 20 of this disclosure.

[0069] Figure 6 shows the display area E of the display device 20 mounted on the second vehicle. In this figure, since the display area E can be covered by the illumination area L (the area indicated by dotted shading) of the backlight device 50, the reduction in display uniformity of the display area E can be suppressed. Furthermore, since the reduction in display uniformity of the display area E can be suppressed, one display device 20 can be applied to the HUD devices of various models in multiple vehicle types.

[0070] The implementation method will be described in detail below with reference to the accompanying drawings.

[0071] Furthermore, the embodiments described below are either general or specific examples. The numerical values, shapes, materials, constituent elements, the arrangement and connection methods of constituent elements, steps, and the order of steps shown in the following embodiments are examples and are not intended to limit this disclosure. In addition, constituent elements in the following embodiments that represent the highest-level concept but are not described in the independent claims are described as arbitrary constituent elements.

[0072] (Implementation Method 1)

[0073] [Structure of a Head-Up Display Device]

[0074] The structure of the head-up display device according to Embodiment 1 will be described with reference to Figures 7 to 9.

[0075] Figure 7 is a diagram showing a vehicle 4 equipped with the head-up display device 2 according to Embodiment 1. Figure 8 is a diagram showing the area 12 of the windshield 10 through which the HUD image 8 is displayed via the head-up display device 2. Figure 9 is a diagram showing the structure of the head-up display device 2.

[0076] As shown in Figure 7, the HUD device 2 is installed inside the dashboard 6 of a vehicle such as a car 4.

[0077] As shown in Figures 7-9, in the HUD device 2, by projecting the display light used to display the HUD image 8 as a virtual image towards, for example, the area 12 of the windshield 10 of a vehicle 4 near the driver's seat, the display light is reflected towards the driver 14 in area 12 of the windshield 10. Thus, the driver 14 can view the HUD image 8 as a virtual image in area 12 of the windshield 10, superimposed on the view in front of the windshield 10. That is, for the driver 14, the HUD image 8 appears as a display in the space 16 in front of the windshield 10.

[0078] As shown in Figure 9, the HUD device 2 includes a main housing 18, a display device 20, a first reflector 22, and a second reflector 24. Additionally, the HUD device 2 may also include a glass plate and a heat sink (not shown).

[0079] The main housing 18 is box-shaped and is made of a metal such as aluminum. The main housing 18 is disposed inside the dashboard 6 of the vehicle 4. A display device 20, a first reflector 22, and a second reflector 24 are housed inside the main housing 18. The upper surface of the main housing 18 is positioned facing the windshield 10. An opening 26 is formed on the upper surface of the main housing 18. This opening 26 is covered, for example, by a cover member 28, which is made of a transparent resin sheet.

[0080] The display device 20, for example, is a PGU (Picture Generation Unit) that projects display light toward the first reflector 22 for displaying the HUD image 8.

[0081] The first reflector 22, for example, is a convex mirror, which reflects the display light emitted from the display device 20 toward the second reflector 24. The second reflector 24, for example, is a concave mirror, which reflects the display light reflected by the first reflector 22 toward the area 12 of the windshield 10. After the display light reflected by the second reflector 24 passes through the cover member 28 and is reflected in the area 12 of the windshield 10, it enters the eyes of the driver 14.

[0082] Furthermore, this embodiment shows an example of HUD device 2 having multiple reflectors, but it is not limited to this; HUD device 2 may also have a single reflector.

[0083] [Structure of the display device]

[0084] The structure of the display device 20 of Embodiment 1 will be described with reference to Figures 10 to 13.

[0085] Figure 10 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20 of Embodiment 1. Figure 11 is a diagram showing the outer optical element 72 included in the backlight device 50.

[0086] As shown in Figure 10, the display device 20 includes a backlight device 50, a diffuser plate 90, and a display panel 40. The backlight device 50, the diffuser plate 90, and the display panel 40 are arranged in this order in the Z-axis direction and are housed inside the housing 30 (see Figure 9).

[0087] The backlight device 50 is a device that emits light toward the rear side 40a of the display panel 40. The backlight device 50 has multiple light sources 60 and multiple optical elements 70. The backlight device 50 is also referred to as a backlight unit.

[0088] The diffuser plate 90 is a sheet-like plate used to diffuse and homogenize light. The diffuser plate 90 is disposed between the backlight device 50 and the display panel 40. The diffuser plate 90 can be configured such that its surface is perpendicular to the Z-axis direction, or it can be configured at an angle instead of perpendicularly. Furthermore, Figure 10 shows an example of a display device 20 equipped with a diffuser plate 90, but it is not limited to this; the display device 20 may also be without a diffuser plate 90.

[0089] Display panel 40 is an element that outputs images based on light emitted from backlight device 50. Display panel 40 is, for example, a liquid crystal panel, having a rectangular shape in an XY top view. The back surface 40a of display panel 40 faces diffuser plate 90 and backlight device 50. Display panel 40 can be configured with back surface 40a perpendicular to the Z-axis direction, or it can be configured at an angle instead of perpendicular.

[0090] A display area E for displaying an image is formed on the display panel 40. In Figure 10, the end of the display area E protrudes further outward than the outer optical element 72. Light incident on the back surface 40a of the display panel 40 passes through the display area E of the display panel 40 and is emitted as display light representing the image displayed in the display area E, and is projected onto the windshield 10.

[0091] As described above, the backlight device 50 has multiple light sources 60 and multiple optical elements 70.

[0092] Multiple light sources 60 are arranged in a matrix at equal intervals in a two-dimensional configuration. The light sources 60 are, for example, light-emitting diodes (LEDs). The multiple light sources 60 have the same emitting area and the same emitting size. The multiple light sources 60 are formed on a substrate (not shown) or mounted on a substrate.

[0093] Multiple optical elements 70 are arranged in a one-to-one correspondence with multiple light sources 60. The optical elements 70 are configured such that their optical axes 70a coincide with the optical axes 60a of the light sources 60. That is, the multiple optical elements 70 are also arranged in a matrix-like, equally spaced two-dimensional arrangement. The multiple optical elements 70 are, for example, composite elements such as lens arrays, formed of glass or resin. Each of the multiple optical elements 70 has a shape that is symmetrical about its optical axis 70a. Each optical element 70 has the function of converging and outputting incident light. That is, each optical element 70 has positive focal length.

[0094] In Figure 10, multiple optical elements 70 and multiple light sources 60 are arranged along the X-axis and Y-axis, respectively. The multiple light sources 60 and multiple optical elements 70 are arranged in a matrix of three or more × three. Furthermore, for ease of understanding, lines are drawn between adjacent optical elements 70 in this figure, but in reality, no lines (e.g., boundary lines) are set between adjacent optical elements 70.

[0095] Multiple optical elements 70 are disposed between multiple light sources 60 and the display panel 40. Light emitted from the light sources 60 enters the optical elements 70. The optical elements 70 converge the incoming light and emit it toward the diffuser plate 90 and the display panel 40.

[0096] Multiple optical elements 70 have light-incident surfaces 73 facing the light source 60 and light-exit surfaces 74 facing the diffuser plate 90 or the display panel 40. The light-incident surfaces 73 of the multiple optical elements 70 are planar and have the same area. The light-exit surfaces 74 of the multiple optical elements 70 are convex curved surfaces, and the area of ​​the curved surface of the outer optical element 72 is different from the area of ​​the curved surface of the inner optical element 71.

[0097] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the area where the plurality of optical elements 70 are disposed, and the inner optical element 71 is located further inward than the outer optical element 72. The outer peripheral region 52 is the outer peripheral portion of the backlight device 50 when viewed from above in the XY direction. The XY view means the same as the view when viewed from the direction along the optical axis 70a or from the Z-axis direction. The outer peripheral region 52 has a frame-like shape. For example, the frame width of the outer peripheral region 52 is the same as the width of one optical element 70. The inner optical element 71 is disposed in the inner region 51, which is further inward than the outer peripheral region 52.

[0098] Figure 10 shows an example of four optical elements 70 arranged in the X-axis direction. The four optical elements 70 consist of two outer optical elements 72 located in the outer peripheral region 52 and two inner optical elements 71 located in the inner region 51. As shown in Figure 11, the outer optical elements 72 are shorter in height and have a smaller curvature as their convex light-emitting surface 74 compared to the inner optical elements 71. Furthermore, the dashed lines in Figure 11 show the outline of the inner optical elements 71 for comparison. A smaller curvature implies a larger radius of curvature.

[0099] In this embodiment, the outer optical element 72 disposed in the outer peripheral region 52 of the region where multiple optical elements 70 are disposed, and the inner optical element 71 disposed in the inner region 51, have different structures. In this example, the focal power of the outer optical element 72 is different from that of the inner optical element 71. More specifically, the focal power of the outer optical element 72 is lower than that of the inner optical element 71. Lower focal power means lower ability to converge light.

[0100] By reducing the focal length of the outer optical element 72, the divergence angle of the light emitted from the light-emitting surface 74 of the outer optical element 72 increases. For example, as shown in FIG10, the inner optical element 71 converges the light emitted from the inner light source 61 and emits the light approximately parallel to the optical axis 70a, but the outer optical element 72 causes the light emitted from the outer light source 62 to be emitted slightly diffused. In this way, by reducing the focal length of the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0101] [Modification 1 of Implementation Method 1]

[0102] The display device 20 of Modification 1 of Embodiment 1 will be described. In Modification 1, an example in which the outer optical element 72 is asymmetrical about the optical axis 70a will be described.

[0103] Figure 12 is a diagram showing the outer optical element 72 included in the backlight device 50 of Modified Example 1. Furthermore, the diffuser plate 90 is omitted from the illustration in Figure 12. In subsequent figures, the diffuser plate 90 is sometimes also omitted.

[0104] The display device 20 of Modified Example 1 includes a backlight device 50 and a display panel 40. The backlight device 50 has a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The structure of the display panel 40 of Modified Example 1 is the same as that of Embodiment 1.

[0105] As shown in Figure 12, the multiple light sources 60 are each symmetrical about the optical axis 60a of the light source 60. Among the multiple optical elements 70, the inner optical element 71 is symmetrical about the optical axis 70a of the inner optical element 71. On the other hand, the outer optical element 72 is asymmetrical about the optical axis 70a of the outer optical element 72.

[0106] The outer optical element 72 has an inner portion 72a located on the side of the inner optical element 71 with reference to the optical axis 70a of the outer optical element 72, and an outer portion 72b located on the opposite side of the inner optical element 71. The focal power of the outer portion 72b is different from that of the inner portion 72a. In this example, the focal power of the outer portion 72b is lower than that of the inner portion 72a. In addition, the curvature of the light emitting surface 74 of the outer portion 72b is smaller than that of the light emitting surface 74 of the inner portion 72a. Furthermore, the dashed lines in FIG12 show the outline of the inner optical element 71 for comparison.

[0107] By reducing the focal length of the outer portion 72b, the divergence angle of the light emitted from the outer portion 72b of the outer optical element 72 increases. For example, as shown in FIG12, the inner portion 72a converges the light emitted from the outer light source 62 and emits the light approximately parallel to the optical axis 70a, while the outer portion 72b causes the light emitted from the outer light source 62 to be emitted slightly diffused. In this way, by reducing the focal length of the outer portion 72b, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0108] [Modification 2 of Implementation Method 1]

[0109] The display device 20 of Modification 2 of Embodiment 1 will be described. In Modification 2, an example in which the center-to-center distance between the outer optical element 72 and the inner optical element 71 is longer than that in Embodiment 1 will be described.

[0110] Figure 13 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20 of Modified Example 2 of Embodiment 1. Figure 14 is a diagram showing the outer light source 62 and the outer optical element 72 included in the backlight device 50.

[0111] As shown in Figure 13, the display device 20 of Modified Example 2 includes a backlight device 50 and a display panel 40. The backlight device 50 has a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The structure of the display panel 40 of Modified Example 2 is the same as that of Embodiment 1. In this figure, a plurality of optical elements 70 and a plurality of light sources 60 are arranged in the X-axis direction, and a plurality of optical elements 70 and a plurality of light sources 60 are also arranged in the Y-axis direction.

[0112] Multiple light sources 60 are arranged in a matrix-like two-dimensional configuration. All light sources 60 have the same luminous area and the same luminous size. Each of the multiple light sources 60 is symmetrical about its optical axis 60a.

[0113] In Modification 2, the plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the region in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the inner light source 61 adjacent to the outer light source 62 is different from the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0114] In Modification 2, the plurality of optical elements 70 are arranged in a one-to-one correspondence with the plurality of light sources 60. In this example, the optical axis 70a of the inner optical element 71 is aligned with the optical axis 60a of the inner light source 61, and the optical axis 70a of the outer optical element 72 is aligned with the optical axis 60a of the outer light source 62. That is, the plurality of optical elements 70 are also arranged in a matrix-like two-dimensional configuration. The plurality of optical elements 70 are each symmetrical about their optical axes 70a. Each optical element 70 has the function of converging and outputting incident light. That is, each optical element 70 has positive focal length.

[0115] Multiple optical elements 70 have a light-injecting surface 73 facing the light source 60 and a light-exiting surface 74 facing the display panel 40. The light-injecting surface 73 is planar, and the light-exiting surface 74 is a convex curved surface.

[0116] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the region in which the plurality of optical elements 70 are disposed, and the inner optical element 71 is located further inward than the outer optical element 72. The distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is different from the distance d1 between the optical axes 70a of two adjacent inner optical elements 71.

[0117] Figure 13 shows an example of four optical elements 70 arranged in the X-axis direction. The four optical elements 70 consist of two outer optical elements 72 located in the outer peripheral region 52 and two inner optical elements 71 located in the inner region 51.

[0118] The light-incident surfaces 73 of the four optical elements 70 are planar, with the area of ​​the planar surface of the outer optical element 72 differing from that of the inner optical element 71. The light-exit surfaces 74 of the four optical elements 70 are convex curved surfaces, with the height and area of ​​the light-exit surface 74 of the outer optical element 72 differing from those of the inner optical element 71. In other words, the effective size of the outer optical element 72 differs from that of the inner optical element 71. Specifically, as shown in Figure 14, the height of the light-exit surface 74 of the outer optical element 72 is greater than that of the inner optical element 71, and the area of ​​the light-exit surface 74 of the outer optical element 72 is larger than that of the inner optical element 71. That is, the effective size of the outer optical element 72 is larger than that of the inner optical element 71. Furthermore, the dashed lines in Figure 14 show the outline of the inner optical element 71 for comparison.

[0119] In this modified example, the outer optical element 72 and outer light source 62 disposed in the outer peripheral region 52 of the region where multiple optical elements 70 and multiple light sources 60 are disposed have different structures from the inner optical element 71 and inner light source 61 disposed in the inner region 51. Specifically, the distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is longer than the distance d1 between the optical axes 70a of two adjacent inner optical elements 71. In addition, the distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the inner light source 61 adjacent to the outer light source 62 is longer than the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0120] As described above, the distance d2 > d1 with respect to the optical axis 70a of the optical element 70 is set, thereby widening the width of the light emitted from the light emitting surface 74 of the outer optical element 72. For example, as shown in FIG13, the inner optical element 71 emits light with a width corresponding to the inner optical element 71, and the outer optical element 72 emits light with a width corresponding to the outer optical element 72, which has a width wider than the inner optical element 71. In this way, by increasing the width of the light emitted from the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light amount at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0121] [Modification 3 of Implementation Method 1]

[0122] The display device 20 of Modification 3 of Embodiment 1 will be described. In Modification 3, an example in which the light emission size of the outer light source 62 is larger than the light emission size of the inner light source 61 will be described.

[0123] Figure 15 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20 of Modified Example 3 of Embodiment 1. Figure 16 is a diagram showing the outer light source 62 included in the backlight device 50.

[0124] As shown in Figure 15, the display device 20 of Modified Example 3 includes a backlight device 50 and a display panel 40. The backlight device 50 has a plurality of light sources 60 arranged in a two-dimensional pattern and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The structure of the display panel 40 of Modified Example 3 is the same as that of Embodiment 1. In this figure, a plurality of optical elements 70 and a plurality of light sources 60 are arranged in the X-axis direction, and a plurality of optical elements 70 and a plurality of light sources 60 are also arranged in the Y-axis direction.

[0125] Multiple light sources 60 are arranged in a matrix at equal intervals in a two-dimensional configuration. Each of the multiple light sources 60 is symmetrical about its optical axis 60a.

[0126] In Modification 3, the plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the region where the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The light emission size of the outer light source 62 is different from that of the inner light source 61. In this example, the light emission size of the outer light source 62 is larger than that of the inner light source 61. A larger light emission size means a larger light emission area of ​​the light source 60.

[0127] In Modification 3, multiple optical elements 70 are arranged in a one-to-one correspondence with multiple light sources 60. The optical elements 70 are arranged such that their optical axes 70a coincide with the optical axes 60a of the light sources 60. That is, the multiple optical elements 70 are also arranged in a matrix-like, equally spaced two-dimensional arrangement. The multiple optical elements 70 have the same shape, each exhibiting a shape that is symmetrical about its optical axis 70a. Each optical element 70 has the function of converging and outputting incident light. That is, each optical element 70 has positive focal length.

[0128] The plurality of optical elements 70 includes outer optical elements 72 and inner optical elements 71. The outer optical elements 72 are located in at least a portion of the outer peripheral region 52 of the area in which the plurality of optical elements 70 are arranged, and the inner optical elements 71 are located further inward than the outer optical elements 72. Figure 15 shows an example of four optical elements 70 arranged in the X-axis direction. The four optical elements 70 consist of two outer optical elements 72 located in the outer peripheral region 52 and two inner optical elements 71 located in the inner region 51.

[0129] In this modified example, the outer light source 62 disposed in the outer peripheral region 52 of the region where multiple light sources 60 are disposed has a different structure from the inner light source 61 disposed in the inner region 51. Specifically, the light emission size of the outer light source 62 is larger than that of the inner light source 61.

[0130] By increasing the luminous size of the outer light source 62, the divergence angle of the light emitted from the light-emitting surface 74 of the outer optical element 72 increases. For example, as shown in FIG15, the inner optical element 71 converges the light emitted from the inner light source 61 and emits the light approximately parallel to the optical axis 70a, but the outer optical element 72 causes the light emitted from the inner end of the outer light source 62 to be emitted obliquely outward. In this way, by increasing the luminous size of the outer light source 62, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0131] In addition to the structure of the light source 60 described above, the display device 20 can also change the luminous power of the light source 60 according to the shape of the display area E. For example, when the shape of the display area E is trapezoidal (see Figure 6), the display device 20 can make the luminous power of the light source 62 located on the outer side of the two ends of the lower base higher than the luminous power of the light source 61 located on the inner side of the inner area 51. Furthermore, the display device 20 can also make the luminous power of the light source 62 located on the outer side of the two ends of the lower base higher than the luminous power of the light source 62 located on the outer side of the two ends of the upper base. In other words, when there are areas with high light intensity per unit area and areas with low light intensity per unit area in the display area E, the display device 20 can increase the luminous power of the light source 60 in the areas with low light intensity compared to the areas with high light intensity.

[0132] [Modification 4 of Implementation Method 1]

[0133] The display device 20 of Modification 4 of Embodiment 1 will be described. In Modification 4, an example in which the outer optical element 72 has a TIR (Total Internal Reflection) section 76 will be described.

[0134] Figure 17 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20 of Modification 4 of Embodiment 1. Figure 18 is a diagram showing the outer optical element 72 included in the backlight device 50.

[0135] As shown in Figure 17, the display device 20 of Modified Example 4 includes a backlight device 50 and a display panel 40. The backlight device 50 has a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The structure of the display panel 40 and the light sources 60 in Modified Example 4 is the same as that in Embodiment 1.

[0136] The structure of the optical element 70 in Modification 4 is largely the same as that in Embodiment 1, but in Modification 4, the outer optical element 72 has a TIR section 76. The TIR section 76 is a portion for introducing light emitted from the outer light source 62. As shown in FIG18, the TIR section 76 is provided on the light-incident surface 73 side of the outer optical element 72, and is provided at the outermost end of the outer optical element 72. Furthermore, the dashed line containing the curve in FIG18 shows the outline of the inner optical element 71 for comparison.

[0137] In this modified example, the outer optical element 72 has a TIR portion 76, thereby suppressing the reduction in light intensity at the outer periphery of the display area E. This, in turn, suppresses the reduction in display uniformity of the display area E.

[0138] [Variations 5, 6, 7, and 8 of Embodiment 1]

[0139] The backlight device 50 of variations 5, 6, 7 and 8 of Embodiment 1 will be described. In these variations, the shape of the outer optical element 72 when viewed from above in the XY direction of the backlight device 50 will be described.

[0140] Figure 19 is a top view showing the backlight device 150 of Comparative Example 3.

[0141] Figure 19 shows a two-dimensional arrangement of multiple lenses 170 and multiple light sources 160. The multiple lenses 170 and multiple light sources 160 are arranged in a matrix at equal intervals. The lenses 170 are square when viewed from above in the XY direction, with rounded corners. Each lens 170 has the same shape. The backlight device 150 of Comparative Example 3 has the same problem as Comparative Example 1.

[0142] Figure 20 is a top view showing the backlight device 150 of Comparative Example 4.

[0143] Figure 20 shows a plurality of lenses 170 and a plurality of light sources 160 arranged in a two-dimensional configuration. The plurality of lenses 170 and the plurality of light sources 160 are arranged in a matrix at equal intervals. The lenses 170 are circular when viewed from above in the XY direction. Each lens 170 has the same shape. The backlight device 150 of Comparative Example 4 has the same problem as Comparative Example 1.

[0144] Figure 21 is a top view of the backlight device 50 of a variation 5 of embodiment 1.

[0145] Figure 21 shows a plurality of optical elements 70 and a plurality of light sources 60 arranged in a two-dimensional configuration. The plurality of optical elements 70 and the plurality of light sources 60 are arranged in a matrix at equal intervals.

[0146] The inner optical element 71 of the plurality of optical elements 70 has a shape that is symmetrical about the optical axis 70a of the inner optical element 71. On the other hand, the outer optical element 72 has a shape that is asymmetrical about the optical axis 70a of the outer optical element 72.

[0147] For example, the outer optical element 72 has an inner portion 72a located on the side of the inner optical element 71 with reference to the optical axis 70a of the outer optical element 72, and an outer portion 72b located on the opposite side of the inner optical element 71. The power of the outer portion 72b is lower than that of the inner portion 72a.

[0148] In this way, by reducing the focal length of the outer portion 72b, the divergence angle of the light emitted from the outer portion 72b of the outer optical element 72 increases, which can suppress the decrease in light intensity at the outer periphery of the display area E. Therefore, it is possible to suppress the reduction in display uniformity of the display area E.

[0149] Figure 22 is a top view showing the backlight device 50 of a variation 6 of Embodiment 1.

[0150] Figure 22 shows a plurality of optical elements 70 and a plurality of light sources 60 arranged in a two-dimensional configuration. The plurality of optical elements 70 and the plurality of light sources 60 are arranged in a matrix at equal intervals.

[0151] The inner optical element 71 of the plurality of optical elements 70 has a shape that is symmetrical about the optical axis 70a of the inner optical element 71. On the other hand, the outer optical element 72 has a shape that is asymmetrical about the optical axis 70a of the outer optical element 72.

[0152] For example, the outer optical element 72 has an inner portion 72a located on the side of the inner optical element 71 with reference to the optical axis 70a of the outer optical element 72, and an outer portion 72b located on the opposite side to the inner optical element 71. When the backlight device 50 is viewed from the direction along the optical axis 70a of the outer optical element 72, the curvature of the outer periphery of the outer portion 72b is smaller than the curvature of the outer periphery of the inner portion 72a.

[0153] Figure 23 is an enlarged view of the optical element 72 on the outer side of the backlight device 50 in Modification 6 of Embodiment 1. Figure 24 is a diagram showing the curvature of the outer periphery of the optical element 72 on the outer side of Modification 6 of Embodiment 1.

[0154] Figure 24 shows the curvature of the outer optical element 72 within the angle range of 0 to π / 2 and the curvature within the angle range of π / 2 to 2π. Within the angle range of 0 to π / 2 corresponding to the inner portion 72a, the curvature is constant. Within the angle range of π / 2 to 2π corresponding to the outer portion 72b, the curvature is smaller than that within the angle range of 0 to π / 2, and the curvature varies. Furthermore, the angle is the angle centered on the optical axis 70a of the outer optical element 72.

[0155] Figure 24(a) shows an example where the curvature decreases proportionally to the change in angle, then increases and returns to its original curvature; (b) shows an example where the curvature changes as a specified function; and (c) shows an example where the curvature does not change within a portion of the angle π to 3π / 2, and changes within π / 2 to π and 3π / 2 to 2π.

[0156] In these examples, the focal length of the outer portion 72b is also lower than that of the inner portion 72a. By reducing the focal length of the outer portion 72b, the divergence angle of the light emitted from the outer portion 72b of the outer optical element 72 increases, which can suppress the decrease in light intensity at the outer periphery of the display area E. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0157] Furthermore, the above description shows an example of changing the curvature of the outer optical element 72 in stages within the range of angles π / 2 to 2π, but this is not a limitation. The curvature of the outer optical element 72 can also be changed within a narrower range than π / 2 to 2π. That is, the curvature of the outer optical element 72 can also be changed within a portion of the range of angles π / 2 to 2π. Additionally, the above description shows an example of changing the curvature within the range of angles π / 2 to 2π, but this is not a limitation. For example, the parameter changed within the range of angles π / 2 to 2π can also be other coefficients used to define the surface.

[0158] Figure 25 is a top view showing the backlight device 50 of a variation 7 of Embodiment 1.

[0159] Figure 25 shows a plurality of optical elements 70 and a plurality of light sources 60 arranged in a two-dimensional configuration. The plurality of optical elements 70 and the plurality of light sources 60 are respectively arranged in a matrix.

[0160] The plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the region in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the adjacent inner light source 61 is longer than the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0161] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the region in which the plurality of optical elements 70 are disposed, and the inner optical element 71 is located inward of the outer optical element 72. The distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the adjacent inner optical element 71 is longer than the distance d1 between the optical axes 70a of two adjacent inner optical elements 71.

[0162] The light-emitting surfaces 74 of the four optical elements 70 are each convex curved surfaces, and the area of ​​the curved surface of the outer optical element 72 is different from that of the inner optical element 71. In this example, the effective size of the outer optical element 72 is larger than that of the inner optical element 71.

[0163] As described above, the distance d2 to the optical axis 70a of the optical element 70 is set to be greater than the distance d1, thereby widening the width of the light emitted from the light-emitting surface 74 of the outer optical element 72. In this way, by increasing the width of the light emitted from the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0164] Figure 26 is a top view showing the backlight device 50 of a variation 8 of Embodiment 1.

[0165] Figure 26 shows a plurality of optical elements 70 and a plurality of light sources 60 arranged in a two-dimensional configuration. The plurality of optical elements 70 and the plurality of light sources 60 are respectively arranged in a matrix.

[0166] The plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the region in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the adjacent inner light source 61 is longer than the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0167] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the region in which the plurality of optical elements 70 are disposed, and the inner optical element 71 is located inward of the outer optical element 72. The distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the adjacent inner optical element 71 is longer than the distance d1 between the optical axes 70a of two adjacent inner optical elements 71.

[0168] The light-emitting surfaces 74 of the four optical elements 70 are each convex curved surfaces, and the area of ​​the curved surface of the outer optical element 72 is different from that of the inner optical element 71. In this example, the effective size of the outer optical element 72 is larger than that of the inner optical element 71.

[0169] As described above, the distance d2 to the optical axis 70a of the optical element 70 is set to be greater than the distance d1, thereby widening the width of the light emitted from the light-emitting surface 74 of the outer optical element 72. In this way, by increasing the width of the light emitted from the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0170] (Implementation Method 2)

[0171] [Structure of the display device]

[0172] The structure of the display device 20A of Embodiment 2 will be described with reference to FIG27.

[0173] Figure 27 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20A of Embodiment 2.

[0174] As shown in Figure 27, the display device 20A includes a backlight device 50, a diffuser plate 90, and a display panel 40. The backlight device 50, diffuser plate 90, and display panel 40 are arranged in this order along the Z-axis and housed inside a housing 30 (see Figure 9). Furthermore, the diffuser plate 90 is omitted from the illustration in Figure 27. The structure of the display panel 40 is the same as in Embodiment 1.

[0175] The backlight device 50 is a device that emits light toward the back surface 40a of the display panel 40. The backlight device 50 has multiple light sources 60 and multiple optical elements 70.

[0176] Multiple light sources 60 are arranged in a matrix at equal intervals in a two-dimensional configuration. The light sources 60 are, for example, light-emitting elements such as LEDs. The multiple light sources 60 have the same emitting area and the same emitting size. Each of the multiple light sources 60 is symmetrical about its optical axis 60a. The multiple light sources 60 are formed on a substrate (not shown) or mounted on a substrate.

[0177] Multiple optical elements 70 are arranged in a one-to-one correspondence with multiple light sources 60. The optical elements 70 are configured such that their optical axes 70a coincide with the optical axes 60a of the light sources 60. That is, the multiple optical elements 70 are also arranged in a matrix-like, equally spaced two-dimensional arrangement. The multiple optical elements 70 are, for example, composite elements such as reflector arrays, formed from metal components with mirror surfaces. Each of the multiple optical elements 70 has a shape that is symmetrical about its optical axis 70a. Each optical element 70 has the function of converging and outputting incident light. That is, each optical element 70 has positive focal length.

[0178] In Figure 27, multiple optical elements 70 and multiple light sources 60 are arranged in the X-axis direction, and multiple optical elements 70 and multiple light sources 60 are also arranged in the Y-axis direction.

[0179] Multiple optical elements 70 are disposed between multiple light sources 60 and the display panel 40. Light emitted from the light sources 60 enters the optical elements 70. The optical elements 70 reflect and converge the incoming light, and emit it toward the diffuser plate 90 and the display panel 40.

[0180] The optical element 70 has a U-shaped or V-shaped cross-section and has a side surface, an opening, and a bottom surface. A through hole is formed on the bottom surface, and a light source 60 is disposed in the through hole.

[0181] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the area where the plurality of optical elements 70 are disposed, and the inner optical element 71 is located further inward than the outer optical element 72. The outer peripheral region 52 is the outer peripheral portion of the backlight device 50 when viewed from above in the XY direction. The outer peripheral region 52 has a frame-like shape. For example, the frame width of the outer peripheral region 52 is the same as the width of one optical element 70. The inner optical element 71 is disposed in an inner region 51 that is further inward than the outer peripheral region 52.

[0182] Figure 27 shows an example of four optical elements 70 arranged in the X-axis direction. The four optical elements 70 consist of two outer optical elements 72 located in the outer peripheral region 52 and two inner optical elements 71 located in the inner region 51.

[0183] The outer optical element 72 has an inner portion 72a located on the side of the inner optical element 71 with reference to the optical axis 70a of the outer optical element 72, and an outer portion 72b located on the opposite side of the inner optical element 71. The focal power of the outer portion 72b is different from that of the inner portion 72a. In this example, the focal power of the outer portion 72b is lower than that of the inner portion 72a. Lower focal power means a lower ability to converge light. Specifically, the opening angle of the side of the outer portion 72b is larger than that of the side of the inner portion 72a. The opening angle of the side refers to the tilt angle of the outer optical element 72 relative to the optical axis 70a.

[0184] By reducing the focal length of the outer portion 72b, the divergence angle of the light emitted from the outer portion 72b of the outer optical element 72 increases. For example, as shown in FIG27, the inner portion 72a converges the light emitted from the outer light source 62 and emits the light approximately parallel to the optical axis 70a, while the outer portion 72b causes the light emitted from the outer light source 62 to be emitted slightly diffused. In this way, by reducing the focal length of the outer portion 72b, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0185] [Modification of Implementation Method 2]

[0186] The display device 20A, a variation of Embodiment 2, will be described. In this variation, an example in which the center-to-center distance between the outer optical element 72 and the inner optical element 71 is longer than that in Embodiment 2 will be described.

[0187] Figure 28 is a diagram showing the backlight device 50 and display panel 40 included in the display device 20A of a modified embodiment 2.

[0188] As shown in Figure 28, the display device 20A of this modified example includes a backlight device 50 and a display panel 40. The backlight device 50 has a plurality of light sources 60 arranged in a two-dimensional pattern and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60. The structure of the display panel 40 of this modified example is the same as that of Embodiment 2. In this figure, the plurality of optical elements 70 and the plurality of light sources 60 are arranged in the X-axis direction, and the plurality of optical elements 70 and the plurality of light sources 60 are also arranged in the Y-axis direction.

[0189] Multiple light sources 60 are arranged in a matrix-like two-dimensional configuration. All light sources 60 have the same luminous area and the same luminous size. Each of the multiple light sources 60 is symmetrical about its optical axis 60a.

[0190] In this modified example, the plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the region in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the inner light source 61 adjacent to the outer light source 62 is different from the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0191] In this modified example, the multiple optical elements 70 are arranged in a one-to-one correspondence with the multiple light sources 60. In this example, the optical axis 70a of the inner optical element 71 coincides with the optical axis 60a of the inner light source 61, and the optical axis 70a of the outer optical element 72 coincides with the optical axis 60a of the outer light source 62. That is, the multiple optical elements 70 are also arranged in a matrix-like two-dimensional configuration. The multiple optical elements 70 are each symmetrical about their optical axes 70a. Each optical element 70 has the function of converging and outputting incident light. That is, each optical element 70 has positive focal length.

[0192] The optical element 70 has a U-shaped or V-shaped cross-section and has a side surface, an opening, and a bottom surface. A through hole is formed on the bottom surface, and a light source 60 is disposed in the through hole.

[0193] The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the region in which the plurality of optical elements 70 are disposed, and the inner optical element 71 is located further inward than the outer optical element 72. The distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is different from the distance d1 between the optical axes 70a of two adjacent inner optical elements 71.

[0194] Figure 28 shows an example of four optical elements 70 arranged in the X-axis direction. The four optical elements 70 consist of two outer optical elements 72 located in the outer peripheral region 52 and two inner optical elements 71 located in the inner region 51.

[0195] The focal power of the outer optical element 72 differs from that of the inner optical element 71. In this example, the focal power of the outer optical element 72 is lower than that of the inner optical element 71. Lower focal power means a lower ability to converge light. Specifically, the opening angle of the side of the outer optical element 72 is larger than that of the side of the inner optical element 71.

[0196] In this modified example, the outer optical element 72 and outer light source 62 disposed in the outer peripheral region 52 of the region where multiple optical elements 70 and multiple light sources 60 are disposed have different structures from the inner optical element 71 and inner light source 61 disposed in the inner region 51. Specifically, the distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is longer than the distance d1 between the optical axes 70a of two adjacent inner optical elements 71. In addition, the distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the inner light source 61 adjacent to the outer light source 62 is longer than the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0197] As described above, the distance d2 > d1 with respect to the optical axis 70a of the optical element 70 is set, thereby widening the width of the light emitted from the outer optical element 72. For example, as shown in FIG28, the inner optical element 71 emits light with a width corresponding to the inner optical element 71, and the outer optical element 72 emits light with a width corresponding to the outer optical element 72, which has a width wider than the inner optical element 71. In this way, by increasing the width of the light emitted from the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light amount at the outer periphery of the display area E can be suppressed. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0198] (Implementation Method 3)

[0199] [Structure of the display device]

[0200] The display device 20B of Embodiment 3 will be described. In Embodiment 3, an example in which an angle adjustment lens 80 is provided between the backlight device 50 and the display panel 40 will be described.

[0201] Figure 29 is a side view of the display device 20B of Embodiment 3.

[0202] The display device 20B of Embodiment 3 includes a backlight device 50, an angle adjustment lens 80, a diffuser plate 90, and a display panel 40. Furthermore, the diffuser plate 90 is omitted from the illustration in FIG29. The structures of the backlight device 50 and the display device 20B are the same as those of Embodiment 1.

[0203] An angle adjustment lens 80 is disposed between the backlight device 50 and the display panel 40 (or diffuser 90). The angle adjustment lens 80 is, for example, a field lens. In this example, the incident surface 83 of the angle adjustment lens 80 is flat, and the outer periphery of the exit surface 84 is a concave curved surface. Light from the outer optical element 72 in the light emitted from the backlight device 50 is emitted obliquely outward, but the angle adjustment lens 80 adjusts the angle of the incident light. In this embodiment, the angle adjustment lens 80 changes the angle of the light emitted from the backlight device 50 according to the angle of the light emitted, and then emits the changed light towards the display panel 40. This suppresses the reduction in display uniformity of the display area E.

[0204] The above example shows an example where the injection surface 83 is flat and the outer periphery of the injection surface 84 is a concave curved surface, but is not limited to this structure.

[0205] Figure 30 is a diagram showing the types of angle adjustment lenses 80 included in the display device 20B of Embodiment 3.

[0206] As shown in Figure 30(a), the entrance surface 83 can be a bulk lens structure (partially curved) and the exit surface 84 can be a bulk lens structure. Alternatively, as shown in Figure 30(b), the entrance surface 83 can be a bulk lens structure (partially curved) and the exit surface 84 can be a Fresnel lens structure. Alternatively, as shown in Figure 30(c), a portion of the entrance surface 83 can be a Fresnel lens structure and the exit surface 84 can be a bulk lens structure. Alternatively, as shown in Figure 30(d), a portion of the entrance surface 83 can be a Fresnel lens structure and the exit surface 84 can be a Fresnel lens structure. Alternatively, as shown in Figure 30(e), the entrance surface 83 can be flat and the exit surface 84 can be a bulk lens structure corresponding to a specific angle. Alternatively, as shown in Figure 30(f), the entrance surface 83 can be flat and the exit surface 84 can be a Fresnel lens structure corresponding to a specific angle. With these structures, the same effect as the angle adjustment lens 80 shown in Figure 29 can be achieved.

[0207] Figure 30 shows a representative example of the combination of the entrance surface 83 and the exit surface 84 of the angle adjustment lens 80, but the entrance surface 83 and the exit surface 84 may also be combined in other ways than the example shown above.

[0208] [Modification 1 of Implementation Method 3]

[0209] Figure 31 is a side view of the display device 20B of Modified Example 1 of Embodiment 3.

[0210] The display device 20B in this modified example 1 includes a backlight device 50, an angle adjustment lens 80, a diffuser plate 90, and a display panel 40. The structure of the backlight device 50 and the display device 20B is the same as that in embodiment 1.

[0211] An angle adjustment lens 80 is disposed between the backlight device 50 and the display panel 40 (or diffuser 90). The angle adjustment lens 80 is, for example, a field lens. In this example, the outer periphery of the incident surface 83 of the angle adjustment lens 80 is a convex curved surface, and the outer periphery of the exit surface 84 is a concave curved surface. Light from the outer optical element 72 in the light emitted from the backlight device 50 is emitted obliquely outward, but the angle adjustment lens 80 adjusts the angle of the incident light. In this modified example, the angle adjustment lens 80 changes the angle of the light emitted from the backlight device 50 according to the angle of the light emitted from the backlight device 50, and then emits the changed light towards the display panel 40. This suppresses the reduction in display uniformity of the display area E.

[0212] [Modification 2 of Implementation Method 3]

[0213] Figure 32 is a side view of the display device 20B of Modified Example 2 of Embodiment 3.

[0214] The display device 20B in this modified example includes a backlight device 50, an angle adjustment lens 80, a diffuser plate 90, and a display panel 40. The structure of the backlight device 50 and the display device 20B is the same as that in embodiment 1.

[0215] An angle adjustment lens 80 is disposed between the backlight device 50 and the display panel 40 (or diffuser 90). The angle adjustment lens 80 is, for example, a field lens. In this example, the outer periphery of the incident surface 83 of the angle adjustment lens 80 is a convex curved surface, and the exit surface 84 is a Fresnel lens structure. Light from the outer optical element 72 in the light emitted from the backlight device 50 is emitted obliquely outward, but the angle adjustment lens 80 adjusts the angle of the incident light. In this modified example, the angle adjustment lens 80 changes the angle of the light emitted from the backlight device 50 according to the angle of the light emitted from the backlight device 50, and emits the changed light towards the display panel 40. This suppresses the reduction in display uniformity of the display area E.

[0216] In addition, Fresnel lens structures can also be constructed as follows.

[0217] Figure 33 is a diagram showing a portion of the angle adjustment lens 80 of a variation of embodiment 3, example 2.

[0218] The angle-adjusting lens 80 can also be configured such that, when the incident surface 83 is flat, the shape of the Fresnel lens structure of the exit surface 84 is changed for each part according to the angle of the incident light. This structure can achieve the same effect as the angle-adjusting lens 80 shown in FIG32.

[0219] (Summarize)

[0220] Examples of display devices (e.g., 20, 20A, 20B) according to one aspect of this disclosure are shown.

[0221] The display device of Example 1 includes: a backlight device 50 having a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60; and a display panel 40 that outputs an image based on light emitted from the backlight device 50. Each of the plurality of optical elements 70 has a positive focal length. The plurality of optical elements (70) includes an outer optical element (72) and an inner optical element (71), the outer optical element (72) being located in at least a portion of the outer peripheral region (52) of the area in which the plurality of optical elements (70) are arranged, and the inner optical element (71) being located further inward than the outer optical element (72). The focal length of the outer optical element 72 is different from that of the inner optical element 71.

[0222] In this way, by making the focal length of the outer optical element 72 different from that of the inner optical element 71, the illumination area L of the backlight device 50 can be adjusted, thereby adjusting the amount of light in the display area E of the display device. This suppresses the reduction in display uniformity in the display area E. Furthermore, since the reduction in display uniformity in the display area E can be suppressed, for example, a single display device can be applied to multiple vehicle models.

[0223] The display device in Example 2 may be, in the display device described in Example 1, wherein the focal power of the outer optical element 72 is lower than that of the inner optical element 71.

[0224] In this way, by reducing the focal length of the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0225] The display device of Example 3 includes: a backlight device 50 having a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60; and a display panel 40 that outputs an image based on light emitted from the backlight device 50. Each of the plurality of optical elements 70 has a positive focal length. The plurality of optical elements 70 includes an outer optical element 72 and an inner optical element 71. The outer optical element 72 is located in at least a portion of the outer peripheral region 52 of the area in which the plurality of optical elements 70 are arranged, and the inner optical element 71 is located inward of the outer optical element 72. The distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is different from the distance d1 between the optical axes 70a of two adjacent inner optical elements 71.

[0226] As described above, the distance to the optical axis 70a of the optical element 70 is set to distance d2 ≠ distance d1, thereby allowing adjustment of the width of the light emitted from the outer optical element 72. Therefore, the illumination area L of the backlight device 50 can be adjusted, thereby adjusting the amount of light in the display area E of the display device. This helps to suppress the reduction in display uniformity in the display area E.

[0227] The display device in Example 4 may be, in the display device described in Example 3, the distance d2 between the optical axis 70a of the outer optical element 72 and the optical axis 70a of the inner optical element 71 adjacent to the outer optical element 72 is longer than the distance d1 between the optical axes 70a of the two adjacent inner optical elements 71.

[0228] As described above, the distance d2 > d1 between the optical axis 70a of the optical element 70 is set, thereby widening the width of the light emitted from the light-emitting surface 74 of the outer optical element 72. Therefore, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Consequently, the reduction in display uniformity of the display area E can be suppressed.

[0229] The display device of Example 5 is the same as that described in Example 4, in which the plurality of light sources 60 include an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the area in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed in a position further inward than the outer light source 62. The distance d2 between the optical axis 60a of the outer light source 62 and the optical axis 60a of the inner light source 61 adjacent to the outer light source 62 may also be longer than the distance d1 between the optical axes 60a of two adjacent inner light sources 61.

[0230] As described above, the distance d2 > d1 between the light source 60 and the optical axis 60a of the light source 60, thereby widening the width of the light emitted from the outer light source 62 through the outer optical element 72. Therefore, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Consequently, the reduction in display uniformity of the display area E can be suppressed.

[0231] The display device of Example 6 includes: a backlight device 50 having a plurality of light sources 60 arranged in two dimensions and a plurality of optical elements 70 corresponding one-to-one with the plurality of light sources 60; and a display panel 40 that outputs an image based on light emitted from the backlight device 50. Each of the plurality of optical elements 70 has a positive focal length. The plurality of light sources 60 includes an outer light source 62 and an inner light source 61. The outer light source 62 is disposed in at least a portion of the outer peripheral region 52 of the area in which the plurality of light sources 60 are disposed, and the inner light source 61 is disposed inward of the outer light source 62. The light emission size of the outer light source 62 is different from that of the inner light source 61.

[0232] In this way, by making the light emission size of the outer light source 62 different from that of the inner light source 61, the illumination area L of the backlight device 50 can be adjusted, thereby adjusting the amount of light in the display area E of the display device. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0233] The display device in Example 7 may be, in the display device described in Example 6, wherein the light-emitting size of the outer light source 62 is larger than the light-emitting size of the inner light source 61.

[0234] In this way, by increasing the light-emitting size of the outer light source 62, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0235] The display device in Example 8 may be any of the display devices described in Examples 1 to 7, wherein the optical element 70 is a lens, and the outer optical element 72 has an inner portion 72a located on the side of the inner optical element 71 with reference to the optical axis 70a of the outer optical element 72, and an outer portion 72b located on the opposite side of the inner optical element 71, wherein the power of the outer portion 72b is lower than that of the inner portion 72a.

[0236] In this way, by reducing the focal length of the outer portion 72b of the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0237] The display device of Example 9 may be, in the display device described in Example 8, in which, when the backlight device 50 is viewed from the direction along the optical axis 70a of the optical element 70, the curvature of the outer periphery of the outer portion 72b is smaller than the curvature of the outer periphery of the inner portion 72a.

[0238] Accordingly, the focal length of the outer portion 72b of the outer optical element 72 can be reduced. Therefore, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Consequently, the reduction in display uniformity of the display area E can be suppressed.

[0239] The display device in Example 10 may be one in which the effective size of the outer optical element 72 is different from the effective size of the inner optical element 71 in any of the display devices described in Examples 1 to 7.

[0240] In this way, by making the effective size of the outer optical element 72 different from the effective size of the inner optical element 71, the illumination area L of the backlight device 50 can be adjusted, thereby adjusting the amount of light in the display area E of the display device. As a result, the reduction in display uniformity of the display area E can be suppressed.

[0241] The display device of Example 11 may be, in the display device described in Example 10, wherein the effective size of the outer optical element 72 is larger than the effective size of the inner optical element 71.

[0242] In this way, by increasing the effective size of the outer optical element 72, the illumination area L of the backlight device 50 can be expanded, and the reduction in light intensity at the outer periphery of the display area E can be suppressed. Therefore, the reduction in display uniformity of the display area E can be suppressed.

[0243] The display device of Example 12 may be, in any of the display devices described in Examples 1 to 7, a plurality of light sources 60 including an outer light source 62 and an inner light source 61, the outer light source 62 being disposed in at least a portion of the outer peripheral region 52 of the region in which the plurality of light sources 60 are disposed, the inner light source 61 being disposed in a position further inward than the outer light source 62, and the luminous power of the outer light source 62 being higher than the luminous power of the inner light source 61.

[0244] By increasing the luminous power of the outer light source 62, the reduction in light intensity at the outer periphery of the display area E can be suppressed. This, in turn, suppresses the reduction in display uniformity of the display area E.

[0245] The display device of Example 13 is one in which the outer optical element 72 has a TIR section 76 for guiding light emitted from the outer light source 62, in any of the display devices described in Examples 1 to 12. The TIR section 76 may also be provided on the light incident surface 73 side of the outer optical element 72.

[0246] In this way, the outer optical element 72 has a TIR portion 76, which can suppress the reduction of light amount at the outer periphery of the display area E. As a result, the reduction of display uniformity in the display area E can be suppressed.

[0247] The display device in Example 14, in any of Examples 1 to 13, further includes an angle adjustment lens 80 disposed between the backlight device 50 and the display panel 40. The angle adjustment lens 80 can also change the angle of the light emitted from the backlight device 50 according to the angle of the light emitted from the backlight device 50, and emit the light with the changed angle toward the display panel 40.

[0248] Therefore, it is possible to suppress the reduction of display uniformity in display area E.

[0249] The head-up display device 2 of Example 15 includes any one of the display devices described in Examples 1 to 14.

[0250] Accordingly, a head-up display device 2 is provided that has a display device capable of suppressing the reduction of display uniformity in the display area E.

[0251] (Other implementation methods)

[0252] The above description addresses a display device and a head-up display device according to one or more embodiments, but this disclosure is not limited to the above embodiments. Various modifications conceived by those skilled in the art to the above embodiments, and combinations of constituent elements from different embodiments, can also be included within the scope of one or more embodiments, provided they do not depart from the spirit of this disclosure.

[0253] In the above description, an example has been given that it has an outer optical element 72 and an inner optical element 71 in the X-axis direction and an outer light source 62 and an inner light source 61 in the Y-axis direction, respectively, but it is not limited to this. For example, the backlight device 50 may also have a structure that has an outer optical element 72 and an inner optical element 71 only in the X-axis direction, and has an outer light source 62 and an inner light source 61 only in the X-axis direction. For example, the backlight device 50 may also have a structure that has an outer optical element 72 and an inner optical element 71 only in the Y-axis direction, and has an outer light source 62 and an inner light source 61 only in the Y-axis direction.

[0254] Industrial availability

[0255] The display devices disclosed herein can be applied, for example, to PGUs mounted on head-up display devices.

[0256] Explanation of reference numerals in the attached figures

[0257] 2. Head-up display (HUD) device

[0258] 4 vehicles

[0259] 6. Dashboard

[0260] 8 HUD images

[0261] 10 Windshield

[0262] 12 regions

[0263] 14 Drivers

[0264] 16 Space

[0265] 18 Main Casing

[0266] 20, 20A, 20B display devices

[0267] 22 First reflecting mirror

[0268] 24 Second reflecting mirror

[0269] 26. Opening

[0270] 28 Cover components

[0271] 30. Housing

[0272] 40 Display Panel

[0273] 40a back

[0274] 50 Backlight Devices

[0275] 51 Inner region

[0276] 52 Peripheral area

[0277] 60 light source

[0278] 60a optical axis

[0279] 61. Inner light source

[0280] 62. External light source

[0281] 70 Optical Components

[0282] 70a optical axis

[0283] 71. Inner optical elements

[0284] 72. External optical elements

[0285] 72a Inner side portion

[0286] 72b Outer part

[0287] 73 Light incident surface

[0288] 74 Light Emission Surface

[0289] 76 TIR section

[0290] 80° adjustable lens

[0291] 83. Injection surface

[0292] 84 injection surface

[0293] 90 Diffuser Plate

[0294] Distance between d1 and d2

[0295] E Display Area

[0296] E0 Displayable Area

[0297] L Irradiation Area

Claims

1. A display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein, Each of the plurality of optical elements has a positive focal length. The plurality of optical elements includes an outer optical element and an inner optical element. The outer optical element is located in at least a portion of the outer peripheral region of the area in which the plurality of optical elements are disposed. The inner optical element is located in a position further inward than the outer optical element. The focal length of the outer optical element is different from that of the inner optical element.

2. The display device according to claim 1, wherein, The focal length of the outer optical element is lower than that of the inner optical element.

3. The display device according to claim 1 or 2, wherein, The optical element is a lens, and the outer optical element has an inner portion located on the side of the inner optical element with reference to the optical axis of the outer optical element and an outer portion located on the opposite side of the inner optical element. The power of the outer portion is lower than that of the inner portion.

4. The display device according to claim 3, wherein, When the backlight device is viewed from the direction along the optical axis of the optical element, the curvature of the outer periphery of the outer portion is smaller than the curvature of the outer periphery of the inner portion.

5. The display device according to claim 1 or 2, wherein, The effective size of the outer optical element is different from that of the inner optical element.

6. The display device according to claim 5, wherein, The effective size of the outer optical element is larger than the effective size of the inner optical element.

7. The display device according to claim 1 or 2, wherein, The plurality of light sources includes an outer light source and an inner light source. The outer light source is disposed in at least a portion of the outer peripheral region of the area in which the plurality of light sources are disposed. The inner light source is disposed in a position further inward than the outer light source. The luminous power of the outer light source is higher than that of the inner light source.

8. The display device according to claim 7, wherein, The outer optical element has a total internal reflection portion for guiding light emitted from the outer light source, the total internal reflection portion being disposed on the light-injection surface side of the outer optical element.

9. The display device according to claim 1 or 2, wherein, It also includes an angle adjustment lens disposed between the backlight device and the display panel, the angle adjustment lens changing the angle of the light emitted from the backlight device according to the angle of the light emitted from the backlight device, and emitting the light after the angle change toward the display panel.

10. A display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein, Each of the plurality of optical elements has a positive focal length. The plurality of optical elements includes an outer optical element and an inner optical element. The outer optical element is located in at least a portion of the outer peripheral region of the area in which the plurality of optical elements are disposed. The inner optical element is located in a position further inward than the outer optical element. The distance between the optical axis of the outer optical element and the optical axis of the inner optical element adjacent to the outer optical element is different from the distance between the optical axes of two adjacent inner optical elements.

11. The display device according to claim 10, wherein, The distance between the optical axis of the outer optical element and the optical axis of the inner optical element adjacent to the outer optical element is longer than the distance between the optical axes of two adjacent inner optical elements.

12. The display device according to claim 11, wherein, The plurality of light sources includes an outer light source and an inner light source. The outer light source is disposed in at least a portion of the outer peripheral region of the area in which the plurality of light sources are disposed. The inner light source is disposed in a position further inward than the outer light source. The distance between the optical axis of the outer light source and the optical axis of the inner light source adjacent to the outer light source is longer than the distance between the optical axes of two adjacent inner light sources.

13. A display device comprising: a backlight device having a plurality of light sources arranged in a two-dimensional manner and a plurality of optical elements corresponding one-to-one with the plurality of light sources; and a display panel that outputs an image based on light emitted from the backlight device, wherein, Each of the plurality of optical elements has a positive focal length, and the plurality of light sources includes an outer light source and an inner light source. The outer light source is disposed in at least a portion of the outer peripheral region of the area in which the plurality of light sources are disposed, and the inner light source is disposed in a position further inward than the outer light source. The light emission size of the outer light source is different from that of the inner light source.

14. The display device according to claim 13, wherein, The light-emitting size of the outer light source is larger than that of the inner light source.

15. A head-up display device comprising the display device according to any one of claims 1 to 14.

Images