JP6461666B2 - Display device - Google Patents

Description

  The present invention relates to a display device that includes a plurality of light sources and a plurality of light guides, and the distance between the paired light sources and the light guides is not constant.

  Patent Document 1 discloses a configuration in which a light-emitting body is fixed and a light guide having elasticity in a skirt portion in contact with the substrate is sandwiched between the panel and the substrate in a display in which the distance between the panel and the substrate varies depending on the position. Is disclosed.

Japanese Patent Laid-Open No. 11-87947

  In a display device in which a panel and a substrate are non-parallel, when a plurality of light sources and a plurality of light guides corresponding to each of the light sources are provided, conventionally, the light source is disposed on the substrate and between the substrate and the display unit on the panel. It was necessary to arrange a plurality of light guides having different heights. In this configuration, there are problems such as an increase in types of parts and a possibility of mistakes during assembly. Furthermore, since the shapes of the light guides are different from each other, and the positional relationship between the light guide and the light source is also different from each other, it is difficult to make the display luminance constant.

  In order to solve this problem, Patent Document 1 proposes a display device in which the distance from the substrate can be adjusted by providing an elastic skirt portion, thereby sharing the light guide. In this display, in order to make the display luminance constant, the positional relationship between the light source and the light guide is made constant by attaching a light source and a small substrate holding the light source to each light guide. In such a configuration, there is a problem that the number of parts increases and the ease of assembly tends to be reduced.

  Therefore, the present invention provides a display device that can suppress variations in display luminance based on each light guide without increasing the number of components and degrading assembly in a display device in which the distance between the panel and the substrate varies depending on the position. An object is to provide an apparatus.

In order to solve the above problems, a display device of the present invention includes a plurality of light sources provided on a substrate, and a plurality of light guides having a common shape for propagating light respectively incident from the plurality of light sources, a display device for displaying a plurality of light guide is based on the light propagating each light guide, there is extending elongated along a central axis, one end of the central axis, The light source is provided with an incident portion on which light emitted from the corresponding light source is incident, and the distance in the direction perpendicular to the optical axis between the optical axis of the light source and the central axis of the light guide is determined by the plurality of guides. as the light emitted from the light body is of comparable intensity light, is characterized in that it is rather small in accordance with the distance between the entrance portion and the substrate becomes long.

  Thereby, since the intensity | strength of the light which injects into a light guide can be controlled according to the distance of the incident part of a light guide and a board | substrate, the emitted light from each light guide can be adjusted.

  In the display device of the present invention, the incident portion is formed with a plurality of incident surfaces having different inclination angles with respect to the surface perpendicular to the central axis, and the incident surface and the substrate are inclined with respect to each other. It is preferable that they are different depending on the distance to each other.

  Depending on the distance between the incident part of the light guide and the substrate, the intensity of the light incident on the light guide is controlled by varying the inclination angle of the incident surface on which the light emitted from the light source is mainly incident. The light emitted from each light guide can be adjusted.

  In the display device of the present invention, the light source is disposed at a position facing the incident surface having a large inclination angle with respect to the light guide having a short distance, and the light source having a small inclination angle with respect to the light guide having a long distance. It is preferable that it is disposed at a position facing the incident surface.

  As a result, light having a low intensity can be incident on the light guide having a short distance from the substrate, and light having a high intensity can be incident on the light guide having a long distance from the substrate. The intensity of light emitted from the body can be made constant.

  In the display device of the present invention, the light source is preferably disposed at a position where the light source is incident on an incident surface disposed so as to be orthogonal to the central axis of the light guide with respect to the light guide having the longest distance. .

  Thereby, the strongest light can be given to the light guide having the largest distance from the substrate.

In the display device of the present invention, it is preferable that the incident surface has a larger area as the inclination angle is smaller.
Thereby, an incident light beam can be increased, so that a light guide with a large distance with a board | substrate is large.

In the display device of the present invention, it is preferable that the incident surface has a smaller surface roughness as the tilt angle is smaller.
Thereby, light with less scattering enters the light guide having a larger distance from the substrate.

  In the display device of the present invention, the light source emits divergent light, and the intensity of the divergent light is preferably smaller as the emission direction is inclined with respect to the optical axis of the light source.

  Thereby, the light which injects into a light guide can be made small, so that the distance with a board | substrate is small.

  In the display device of the present invention, the light source includes a light emitting element and an optical member that emits light emitted from the light emitting element as divergent light, and the intensity of the divergent light has an emission direction with respect to the optical axis of the light emitting element. It is preferable that the tilt is smaller.

  Accordingly, it is possible to realize a light source capable of emitting directional divergent light even when a light emitting element having no directivity is used.

  In the display device of the present invention, the plurality of incident surfaces are preferably two or more surfaces including a surface orthogonal to the central axis of the light guide.

  Thereby, even when there are three or more light guides having different distances from the substrate, it is possible to adjust the positional relationship between the light guide and the light source, thereby reducing the intensity of light emitted from the light guide. Can be adjusted.

  In the display device of the present invention, it is preferable that the plurality of incident surfaces constitute a part of a spherical surface whose angle with respect to the central axis continuously changes.

  Thereby, since the positional relationship between the light guide and the light source can be set more precisely, adjustment of the emitted light from each light guide can be performed more accurately.

  According to the present invention, in a display device in which the distance between the panel and the substrate differs depending on the position, it is possible to suppress variations in display luminance based on the respective light guides without increasing the number of components and without reducing the assemblability.

It is a perspective view which shows the external appearance structure of the display apparatus concerning embodiment of this invention. It is sectional drawing in the II surface of FIG. It is a perspective view which shows the structure of the 1st light guide in embodiment of this invention. (A), (B), (C) is a side view which shows the structure of the modification of a light guide.

Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an external configuration of a display device 10 according to the present embodiment. FIG. 2 is a cross-sectional view taken along plane II in FIG. FIG. 3 is a perspective view showing the configuration of the first light guide 41 of the present embodiment. In each figure, XYZ coordinates are shown as reference coordinates. The XY plane is a plane orthogonal to the Z direction, and in the following description, the Z direction may be referred to as an upward direction.

  As shown in FIG. 1, the display device 10 includes a panel 11, two display units 12 and 13, a substrate 20, and a support plate 21. The substrate 20 is arranged along the XY plane, and the panel 11 is supported by a support plate 21 coupled to the substrate 20 so as to be non-parallel to the substrate 20.

  As shown in FIG. 2, two light sources 31 and 32 are mounted on the substrate 20. The light sources 31 and 32 have the same configuration, and are arranged at predetermined positions so that the optical axes 31x and 32x are along the Z direction. Therefore, the light sources 31 and 32 are mounted on the substrate 20 so that the optical axes 31x and 32x are parallel to each other. In addition, the emission surfaces 31a and 32a of the light sources 31 and 32 are both orthogonal to the optical axes 31x and 32x and parallel to the substrate 20, whereby the emitted light from the light sources 31 and 32 is along the Z direction. proceed. As the light sources 31 and 32, for example, a light emitting diode alone may be used, or a light emitting diode and an optical member such as a lens that emits light emitted from the light emitting diode as divergent light may be used. The light emitting diodes used as the light sources 31 and 32 preferably have directivity. That is, a light-emitting diode having a characteristic that the intensity of light emitted in the direction along the optical axis is the largest, the angle with respect to the optical axis is large, and the light intensity decreases as it approaches 90 degrees is preferable. When using a light-emitting diode that does not have such directivity or has a small difference in light intensity depending on the emission direction, the optical member as described above is arranged on the emission surface side of the light-emitting diode, and incident light from the light-emitting diode is obtained. The above-mentioned directivity can be given by emitting the light as divergent light.

  As shown in FIG. 2, the display units 12 and 13 are respectively inserted into two openings 11a and 11b provided so as to penetrate the panel 11 along the Z direction. The two display units 12 and 13 are arranged such that the upper plates 12 a and 13 a are flush with the panel 11. The display units 12 and 13 are fixed with respect to the panel 11 in the state of being positioned as described above. Here, the panel 11 is not parallel to the substrate 20, and is configured such that the distance between the panel 11 and the substrate 20 decreases as it proceeds in the Y direction.

  As shown in FIGS. 1 and 2, the display device 10 includes two light guides 41 and 42. These light guides 41 and 42 have the same configuration. As for the 1st light guide 41, the output part 41a is provided in one edge part of the center axis 41x direction of a cylindrical member, and the incident part 41b is provided in the other edge part. Similar to the first light guide 41, the second light guide 42 is provided with an emission part 42a at one end in the direction of the central axis 42x of the cylindrical member and an incident part 42b at the other end. Yes. In the light guides 41 and 42, the emitted light from the corresponding light sources 31 and 32 is incident on the incident portions 41b and 42b, respectively, and the light propagates inside and is emitted to the outside from the emitting portions 41a and 42a, respectively. The Thus, a predetermined display is performed based on the light emitted from the light guides 41 and 42.

  As shown in FIGS. 2 and 3, the incident portion 41 b of the first light guide 41 includes a first incident surface 41 c and a second incident surface 41 d. The first incident surface 41 c is a plane that is orthogonal to the central axis 41 x of the first light guide 41 and is a surface that is parallel to the substrate 20. Accordingly, the first incident surfaces 41 c are parallel to the corresponding emission surfaces 31 a of the first light sources 31 and face each other. On the other hand, the second incident surface 41d is a plane that forms a predetermined inclination angle α (FIG. 3) with respect to the first incident surface 41c. Here, the inclination angle α is an angle between 0 ° and less than 90 °, and the first incident surface 41c is a surface on which the inclination angle α is zero. The boundary line 41e between the first incident surface 41c and the second incident surface 41d is set so as to extend in the X direction at a position where the area of the first incident surface 41c is larger than the area of the second incident surface 41d. Has been. The incident portion 42b of the second light guide 42 also includes a first incident surface 42c and a second incident surface 42d having the same configuration as the incident portion 41b of the first light guide 41, as shown in FIG. The first incident surface 42c and the emission surface 32a of the second light source 32 are parallel to each other and face each other.

  An opening 12b is provided in the upper plate 12a of the first display unit 12 so as to penetrate in the Z direction, and the emitting portion 41a of the first light guide 41 is inserted into the opening 12b for press-fitting and bonding. Or by means such as a hook. Similarly, an opening 13b is provided in the upper plate 13a of the second display unit 13 so as to penetrate in the Z direction, and the emitting portion 42a of the second light guide 42 is inserted into the opening 13b. It is fixed. The light guides 41 and 42 are arranged so that the respective central axes 41x and 42x are along the Z direction, and thus the central axis 41x and the central axis 42x are parallel to each other.

  The panel 11 and the display units 12 and 13 are formed by multilayer molding, for example. Specifically, first, a panel 11 is formed by filling a material surrounded by a common mold and a primary mold with a material constituting the panel 11. Next, with the panel 11 remaining on the common mold, the primary mold is replaced with the secondary mold, and the material constituting the display units 12 and 13 in the space surrounded by the common mold and the secondary mold. The display units 12 and 13 are formed. Thereby, the panel 11 and the display units 12 and 13 are integrated in the form by which the display units 12 and 13 are arrange | positioned in the opening parts 11a and 11b of the panel 11, respectively.

  The panel 11 and the display units 12 and 13 are formed of resin, and according to the specifications of the apparatus, a colored resin is used, or characters and images are formed on the surface by printing or the like after the resin is molded. Examples of the resin used for the panel 11 and the display units 12 and 13 include acrylic resin, polymethyl methacrylate resin, polycarbonate, polyethylene, polyethylene terephthalate, cycloolefin resin, and polyurethane resin.

  The light guides 41 and 42 are made of transparent or translucent resin, and are made of, for example, acrylic resin, polymethyl methacrylate resin, polycarbonate, polyethylene, polyethylene terephthalate, cycloolefin resin, or polyurethane resin.

  As shown in FIGS. 1 and 2, since the panel 11 is provided to be inclined with respect to the substrate 20, the distance from the substrate 20 is different between the first light guide 41 and the second light guide 42. That is, the distance L1 between the first light guide 41 and the substrate 20 is smaller than the distance L2 between the second light guide 42 and the substrate 20. Here, the distance between the light guide and the substrate 20 is the minimum distance in the central axis direction of the light guide, that is, in the Z direction, and is the minimum distance between the incident portion of the light guide and the substrate 20. The distance between the light guide and the substrate 20 is the minimum distance between the substrate 20 and the incident surface closest to the substrate 20 among the plurality of incident surfaces.

  In the display device 10 according to the present embodiment, the light source and the corresponding light guide, that is, the light incident from the light source is incident in accordance with the difference in the distance between the incident portion of the light guide and the substrate 20. The positional relationship with the light body is different. More specifically, the distance in the direction perpendicular to the optical axis between the optical axis of the light source and the central axis of the light guide decreases as the distance between the incident portion of the light guide and the substrate 20 increases. It is set to do. Moreover, the light source is made to oppose the incident surface from which the inclination angle with respect to the surface orthogonal to the center axis | shaft of a light guide differs according to the distance of an incident part and the board | substrate 20. FIG.

  For example, for the second light guide 42 in which the distance between the incident portion and the substrate 20 is larger than that of the first light guide 41, the corresponding second light source 32 is orthogonal to the central axis 42 x of the second light guide 42. It arrange | positions in the position which opposes the 1st entrance plane 42c. Thereby, the distance D2 in the direction orthogonal to the optical axis 32x between the optical axis 32x of the second light source 32 and the central axis 42x of the second light guide 42 is equal to the optical axis 31x of the first light source 31 and the first axis. It is set shorter than the distance D1 in the direction orthogonal to the optical axis 31x between the light guide 41 and the central axis 41x.

  On the other hand, for the first light guides 41 having a smaller distance from the substrate 20 than the second light guides 42, the corresponding first light sources 31 are first incident perpendicular to the central axis 41 x of the first light guides 41. It arrange | positions in the position which opposes the 2nd entrance plane 41d which makes the inclination | tilt angle (alpha) with respect to the surface 41c.

  Here, the light source is preferably arranged so that the emitted light is incident on the opposite incident surface at right angles. For example, the first light source 31 is preferably arranged so that the emitted light is incident on the second incident surface 41d at a right angle. At this time, the angle β of the light incident on the second incident surface 41d with respect to the optical axis 31x is equal to the inclination angle α of the second incident surface 41d with respect to the first incident surface 41c.

  When the light sources 31 and 32 are arranged as described above with respect to the light guides 41 and 42, the following effects can be obtained.

(1) Since the positional relationship between the light guide and the light source is changed according to the distance between the incident portion and the substrate 20, the intensity of the light emitted from each of the light guides 41 and 42 is made constant. Thus, the occurrence of variations in display luminance can be suppressed regardless of changes in the distance between the panel 11 and the substrate 20. Specifically, it is as follows.

  In the second light guide 42 having the maximum distance from the substrate 20, the direction of the central axis 42x from the second light source 32 facing the first incident surface 42c orthogonal to the central axis 42x, that is, Z Light along the direction is incident. The incident light travels along the central axis 42x in the second light guide 42 and is emitted from the emission part 42a. The intensity of the emitted light from the second light source 32 has directivity, and the intensity of the light along the Z direction is the highest. Of the light emitted from the second light source 32, light traveling in the optical axis 32 x or a direction close thereto enters the second light guide 42. Therefore, the ratio of the luminous flux incident on the second light guide 42 in the outgoing light from the second light source 32 is high, and the outgoing light from the second light source 32 has directivity, so that light with high light intensity is emitted. Progressing from the second light source 32 to the second light guide 42.

  On the other hand, in the first light guide 41 having a small distance from the substrate 20, the light emitted from the first light source 31 is inclined at an angle α with respect to the first incident surface 41c. Incident on the incident surface 41d. This incident light travels while repeating reflection in the first light guide 41 and is emitted from the emission part 41a. Since the second incident surface 41d is inclined with respect to the optical axis 31x of the first light source 31 by an angle β, the light emitted to the second incident surface 41d side by the directivity of the light intensity of the first light source 31. Is less than the intensity of the light emitted along the optical axis 31x. In addition, out of the light emitted from the first light source 31, light traveling toward the optical axis 31 x or a direction close thereto or light traveling toward the second light guide body 42 does not enter the first light guide body 41. The ratio of the light beam incident on the light body 41 is smaller than the ratio of the light beam incident on the second light guide 42 from the second light source 32. Therefore, the ratio of the light beam incident on the first light guide 41 out of the light emitted from the first light source 31 is small, and the light emitted from the first light source 31 has directivity. Progressing from the first light source 31 to the first light guide 41.

  With the above configuration, the second light source 32 emits light having a large light intensity from the second light source 32 where the distance between the incident portion 42b and the substrate 20 is large and the intensity of the emitted light is likely to be attenuated before entering the second light guide 42. While traveling to the light guide 42, the distance between the incident portion 41 b and the substrate 20 is small, and the first light source 31 has little attenuation of the intensity of the emitted light until it enters the first light guide 41. The light having a small light intensity corresponding to the distance is advanced to the first light guide 41. By such adjustment, it becomes possible to emit the light emitted from the first light guide 41 and the light emitted from the second light guide 42 to the outside as light having a predetermined intensity of the same degree.

(2) In the first light guide 41, the first incident surface 41c has a larger area than the second incident surface 41d, and in the second light guide 42, the first incident surface is larger than the second incident surface 41d. 41c has a larger area. For this reason, more light beams are incident on the first incident surfaces 41c and 42c than on the second incident surfaces 41d and 42d having a small area. By setting such a size relationship, the incident light from the light source disposed at a position facing the first incident surfaces 41c and 42c and the light source disposed at a position facing the second incident surfaces 41d and 42d are used. In addition to the effect (1), the intensity can be further adjusted, so that the intensity of the light emitted from each of the light guides 41 and 42 can be adjusted more accurately. .

(3) Since a light guide having a common shape is used, the number of parts does not increase and assembly performance is not deteriorated.

(4) Since the common light source 31 is used and mounted in the same direction, the types of parts do not increase, and there is no possibility of mistakes during assembly or deterioration of assembly.

(5) Since all the light sources 31 can be driven under the same conditions, the drive control of the light sources 31 is not complicated, and there is no need to newly design a drive control circuit.

A modification will be described below.
In the display device 10 of the above embodiment, two light sources and two light guides are provided, but three or more light sources and light guides may be provided. When three or more light sources and light guides are provided, at least as many light incident surfaces as the number of light sources are provided. For the light guide having the longest distance from the substrate 20, the corresponding light source is disposed at a position facing the first incident surface orthogonal to the central axis of the light guide, as in the case of the second light guide 42. To do. For the light guide whose distance from the substrate 20 is not the maximum, a light source is arranged at a position corresponding to the incident surface having an inclination angle α corresponding to the distance from the substrate 20. That is, for a light guide with a short distance from the substrate 20, a light source is arranged on the substrate 20 so as to correspond to an incident surface with a large inclination angle α. The smaller the distance is, the farther from the central axis of the light guide.

  4A, 4 </ b> B, and 4 </ b> C are side views showing a configuration of a modified example of the light guide, and show an example in which three or more incident surfaces are provided.

  The light guide 50 shown in FIG. 4A has an emission part 51 at one end of the central axis 50x and an incidence part 52 at the other end. The incident part 52 includes a first incident surface 52a, a second incident surface 52b, and a third incident surface 52c. The first incident surface 52 a is a plane orthogonal to the central axis 50 x of the light guide 50. The second incident surface 52b is a plane continuous to the first incident surface 52a via a boundary line 53a extending in the X direction, and has an inclination of an angle A11 with respect to the first incident surface 52a. It is smaller than the incident surface 52a. The third incident surface 52c is a plane continuous to the second incident surface 52b via a boundary line 53b extending in the X direction, and has an inclination of an angle A12 larger than the angle A11 with respect to the first incident surface 52a. The area is smaller than the second incident surface 52b. When the light guide 50 having such a configuration is used, for three light guides having different distances from the substrate 20, three light sources are respectively arranged so as to correspond to the incident surfaces having an inclination angle corresponding to the distance, By making the emitted light incident on the corresponding light guides, it is possible to emit light with less variation in intensity from each light guide.

  The light guide 60 shown in FIG. 4B has an emission part 61 at one end of the central axis 60x and an incidence part 62 at the other end. The incident part 62 includes a first incident surface 62a, a second incident surface 62b, and a third incident surface 62c. The first incident surface 62 a is a plane orthogonal to the central axis 60 x of the light guide 60. The second incident surface 62b is a plane continuous to the first incident surface 62a via the first boundary line 63a extending in the X direction, and has an inclination of an angle A21 with respect to the first incident surface 62a. It is smaller than the first incident surface 62a. The third incident surface 62c is a plane that extends in the X direction and is continuous with the first incident surface 62a via a second boundary line 63b that is parallel to the first boundary line 63a, and is connected to the first incident surface 62a. It has an inclination of an angle A22 larger than the angle A21, and its area is smaller than that of the second incident surface 62b. When three incident surfaces are provided in the incident portion 62, the inclination angle can be increased in order along the Y direction as shown in FIG. 4A, but as shown in FIG. 4B. In addition, incident surfaces having different inclination angles may be provided on both sides in the Y direction of the first incident surface 62a orthogonal to the central axis 60x. By arranging the incident surface as shown in FIG. 4B, the degree of freedom of arrangement of the light source can be increased.

  The light guide 70 shown in FIG. 4C has an emission part 71 at one end of the central axis 70x and an incidence part 72 at the other end. The incident portion 72 is a hemispherical surface whose angle with respect to the central axis 70x continuously changes, and thereby, a plurality of incident surfaces having different inclination angles with respect to the virtual surface 72a orthogonal to the central axis 70x are configured. Thereby, the inclination angle of the incident surface can be finely adjusted with respect to the distance between the light guide and the substrate 20, and more strict light quantity control can be performed.

  In the said embodiment, although the entrance plane was made into the plane, it is preferable to make surface roughness (surface roughness) small, so that the inclination | tilt angle with respect to the surface orthogonal to the central axis of a light guide is small. As a result, the incident surface with a large inclination angle, that is, the incident surface used when the distance from the substrate is small, the surface unevenness becomes larger, and the light is scattered at the time of incidence, so the intensity of the incident light is suppressed. be able to.

  In the above embodiment, the light sources 31 and 32 have the light intensity directivity, but a light source having no directivity can also be used. Also in this case, the amount of incident light flux can be controlled by adjusting the positional relationship between the light guides 41 and 42 and the light sources 31 and 32 according to the distance between the light guides 41 and 42 and the substrate 20. The intensity of light emitted from 41 and 42 can be adjusted.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment, and can be improved or changed within the scope of the purpose of the improvement or the idea of the present invention.

  As described above, the display device according to the present invention is useful when it is required to suppress variations in display luminance even when the distance between the panel and the substrate is changed.

DESCRIPTION OF SYMBOLS 10 Display apparatus 11 Panel 11a, 11b Opening part 12 1st display unit 12a Upper plate 12b Opening part 13 2nd display unit 13a Upper plate 13b Opening part 20 Substrate 21 Support plate 31 1st light source 31a Output surface 31x Optical axis 32 2nd Light source 32a Emission surface 32x Optical axis 41 First light guide 41a Emission portion 41b Incident portion 41c First incidence surface 41d Second incidence surface 41x Central axis 42 Second light guide 42a Emission portion 42b Incident portion 42c First incidence surface 42d Second incident surface 42x Central axis 50 Light guide 50x Central axis 51 Outgoing portion 52 Incident portion 52a First incident surface 52b Second incident surface 52c Third incident surface 60 Light guide 60x Central axis 61 Outlet portion 62 Incident portion 62a First 1 entrance surface 62b 2nd entrance surface 62c 3rd entrance surface 70 light guide 70x central axis 71 exit part 72 entrance part 72a Virtual plane

Claims (10)

A display comprising a plurality of light sources provided on a substrate and a plurality of light guides having a common shape for propagating light respectively incident from the plurality of light sources, and the display based on the light propagated by the plurality of light guides A display device for performing
Each of the light guides extends elongated along a central axis, and an incident portion into which emitted light from a corresponding light source among the plurality of light sources is incident on one end portion in the central axis direction. Prepared,
The distance in the direction orthogonal to the optical axis between the optical axis of the light source and the central axis of the light guide is such that the light emitted from the plurality of light guides has the same intensity. a display device wherein the distance between the substrate and the incident portion is rather small in accordance with the longer. The incident portion is formed with a plurality of incident surfaces having different inclination angles with respect to a surface orthogonal to the central axis,
The display device according to claim 1, wherein an inclination angle of the incident surface facing the light source is different according to a distance between the incident portion and the substrate.   The light source is disposed at a position facing the incident surface having a large inclination angle with respect to the light guide having a short distance between the incident portion and the substrate, and the distance between the incident portion and the substrate is long. The display device according to claim 2, wherein the light guide is disposed at a position facing the incident surface with a small inclination angle.   The light source is arranged at a position where it enters the incident surface arranged so as to be orthogonal to the central axis of the light guide with respect to the light guide having the largest distance between the incident part and the substrate. The display device according to claim 3, wherein the display device is a display device.   The display device according to claim 3, wherein the incident surface has a larger area as the tilt angle is smaller.   The display device according to claim 3, wherein the incident surface has a smaller surface roughness as the tilt angle is smaller.   The display device according to claim 3, wherein the light source emits divergent light, and the intensity of the divergent light is smaller as the emission direction is inclined with respect to the optical axis of the light source.   The light source includes a light emitting element and an optical member that emits light emitted from the light emitting element as divergent light, and the intensity of the divergent light is inclined in the emission direction with respect to the optical axis of the light emitting element. The display device according to claim 7, wherein the display device is smaller.   The display device according to claim 2, wherein the plurality of incident surfaces are two or more surfaces including a surface orthogonal to a central axis of the light guide.   The display device according to claim 2, wherein the plurality of incident surfaces constitute a part of a spherical surface whose angle with respect to the central axis continuously changes.

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