JP2008180823A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which can display an indicator of an instrument appearing as smoothly revolving. <P>SOLUTION: The display device includes a prism sheet 1 having a plurality of concentrically arranged prisms 1a, irradiated with light from a light source 2 to form a beam image 1b that appears to extend as from the center of the concentric circles in the radius direction of the circles, and uses the beam image 1b as an indicator of an instrument. The display device mounts a single light source 2 on a rotator 3 and smoothly rotates the rotator 3. More particularly, the center axial line CL1a of the plurality of concentric prisms 1a is aligned to the center axial line CL3 of the rotator 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention forms a light image that appears to extend in the radial direction of the concentric circle from the center of the concentric circle by irradiating light from the light source onto a prism sheet in which a plurality of prisms are arranged concentrically. The present invention relates to a display device that uses the light image as a pointer of a meter, and more particularly, to a display device that can make a pointer of a meter appear to rotate smoothly.

  Conventionally, by irradiating light from a light source to a prism sheet in which a plurality of prisms are concentrically arranged, a light beam image that appears to extend in the radial direction of the concentric circle from the center of the concentric circle is formed, A display device that uses the light image as a pointer of an instrument is known. An example of this type of display device is described in, for example, Japanese Patent Application Laid-Open No. 2000-35770.

  In the display device described in Japanese Patent Laid-Open No. 2000-35770, a prism sheet (prism plate) is configured by concentrically arranging a plurality of prisms. Further, a plurality of light sources (light emitting bodies) are arranged at equal intervals in the circumferential direction of the concentric circles.

  Specifically, in the display device described in Japanese Patent Laid-Open No. 2000-35770, any one of a plurality of light sources (light emitters) is turned on, and light is emitted from the light sources (light emitters) to a prism sheet (prism plate). By doing so, a light beam image that appears to extend in the radial direction of the concentric circle from the central portion of the concentric circle of the prism sheet (prism plate) is formed. Further, the light image is used as a pointer for an instrument such as a speedometer or a tachometer.

  In the display device described in Japanese Patent Application Laid-Open No. 2000-35770, when the pointer of the instrument is shown to rotate, among a plurality of light sources (light emitters) arranged at equal intervals in the circumferential direction of a concentric circle, The light source (light emitting body) that has been turned on is turned off, and instead, the light source (light emitting body) next to the light source (light emitting body) is turned on. As a result, the light image appears to rotate and the pointer of the instrument appears to rotate.

  By the way, in the display device described in Japanese Patent Laid-Open No. 2000-35770, a light source (light emitting body) having a relatively large width such as a fluorescent display tube or an LED is used. Therefore, even if such light sources (light emitters) are arranged without gaps in the circumferential direction of the concentric circles, a large number of light sources (light emitting bodies) cannot be arranged in the circumferential direction of the concentric circles.

  As a result, in the display device described in Japanese Patent Application Laid-Open No. 2000-35770, a light image that is visible when a certain light source (light emitter) is turned on and a light source (light emitter) next to the light source (light emitter) are provided. The distance from the light image that is visible when the lamp is lit is relatively wide.

  In other words, in the display device described in Japanese Patent Application Laid-Open No. 2000-35770, the indicator of the instrument does not appear to rotate smoothly, but the indicator of the instrument appears to rotate stepwise.

JP 2000-35770 A

  In view of the above problems, an object of the present invention is to provide a display device that can make a pointer of a meter appear to rotate smoothly.

  According to the first aspect of the present invention, the light from the light source is irradiated to the prism sheet in which a plurality of prisms are concentrically arranged, so that the concentric circle extends in the radial direction from the central portion. In a display device that forms a visible light image and uses the light image as a pointer for the instrument, a single light source is mounted on the rotating body, and the rotating pointer is smoothly rotated to smoothly rotate the pointer of the instrument. There is provided a display device characterized in that it looks like this.

  According to the second aspect of the present invention, there is provided the display device according to the first aspect, wherein the central axis of the plurality of prisms and the central axis of the rotating body are made to coincide.

  According to a third aspect of the present invention, there is provided the display device according to the first or second aspect, wherein the single light source is arranged inside the inner edges of the plurality of concentric prisms. .

  According to invention of Claim 4, the display apparatus as described in any one of Claims 1-3 with which the hole was formed in the center part of the said prism sheet is provided.

  According to a fifth aspect of the present invention, there is provided the display device according to the fourth aspect, wherein a part of the rotating body is inserted into the hole of the prism sheet.

  According to the invention described in claim 6, another prism sheet in which a plurality of prisms are concentrically arranged is arranged on the back side of the single light source, and the central axes of the plurality of prisms of the other prism sheet are arranged. The display device according to any one of claims 3 to 5, wherein the center axis of the rotating body is made coincident with each other.

  According to invention of Claim 7, the mirror board has been arrange | positioned at the back side of the said single light source, The display apparatus as described in any one of Claims 1-6 provided.

  According to invention of Claim 8, the light source which can irradiate the light of a several different color was used as said single light source, It is any one of Claims 1-6 characterized by the above-mentioned. The described display device is provided.

  3. The display device according to claim 1, wherein the plurality of light sources are not arranged at equal intervals in the circumferential direction of the plurality of concentric prisms, but a single light source is mounted on the rotator, and the rotator is provided. Can be rotated smoothly. Specifically, the central axes of the plurality of prisms and the central axis of the rotating body are matched.

  Therefore, according to the display device of the first and second aspects, it is possible to make the indicator of the instrument appear to rotate smoothly. Specifically, according to the display device according to claims 1 and 2, the indicator of the instrument is more effective than the case where a plurality of light sources arranged at equal intervals in the circumferential direction of a plurality of concentric prisms are sequentially turned on. It can appear to rotate smoothly.

  In the display device according to the third aspect, the single light source is disposed inside the inner edges of the plurality of concentric prisms. Therefore, according to the display device of the third aspect, the rotating body on which the single light source is mounted is more than the case where the single light source is disposed outside the inner edges of the concentric prisms. The diameter can be reduced, whereby the entire display device can be reduced in size.

  In the display device according to the fourth aspect, a hole is formed in the central portion of the prism sheet. Therefore, according to the display device of the fourth aspect, the light image that seems to extend in the radial direction from the center of the plurality of concentric prisms extends to the opposite side across the central axis of the plurality of prisms. It is possible to avoid the risk of appearing to be.

  In the display device according to the fifth aspect, a part of the rotating body on which the single light source is mounted is inserted into the hole at the center of the prism sheet. Therefore, according to the display device of the fifth aspect, the thickness dimension (depth dimension) of the entire display device can be made smaller than in the case where all of the rotating bodies are arranged on the back side of the prism sheet. .

  In the display device according to the sixth aspect, another prism sheet in which a plurality of prisms are concentrically arranged is arranged on the back side of a single light source. Furthermore, the central axis of the plurality of prisms of the other prism sheet and the central axis of the rotating body are matched. Therefore, according to the display device of the sixth aspect, the light of the light image can be made stronger than the case where only one prism sheet is provided. That is, the light of the light image can be strengthened without increasing the light emission amount of the light source.

  In the display device according to the seventh aspect, the mirror plate is disposed on the back side of the single light source. Therefore, according to the display device of the seventh aspect, the light of the light image can be made stronger than the case where the mirror plate is not provided. That is, the light of the light image can be strengthened without increasing the light emission amount of the light source.

  In the display device according to the eighth aspect, a light source capable of irradiating a plurality of light of different colors is used as a single light source mounted on the rotating body. Therefore, according to the display device of the eighth aspect, it is possible to form a light beam image of a color preferred by the user of the display device as a pointer of the instrument.

  Hereinafter, a first embodiment of a display device of the present invention will be described. FIG. 1 is a front view of a display device according to a first embodiment applied to, for example, a vehicle speedometer, and FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a rear side view of the prism sheet 1 in which a plurality of prisms 1a are arranged concentrically. That is, FIG. 3 is a view of the prism sheet 1 as viewed from the right side of FIG.

  1 to 3, 1a1 indicates the inner edge of a plurality of concentric prisms 1a, and 1b indicates a light beam image that appears to extend in the radial direction of the concentric circle from the center of the concentric circle. 1c shows the hole formed in the center part of the prism sheet 1, 2 shows the light source like LED, for example. Reference numeral 3 denotes a rotating body for mounting the light source 2, and 4 denotes a motor for rotating the rotating body 3. For example, 5 indicates an indicator portion having characters 5a and scales 5b, and 6 indicates a housing.

  In the display device of the first embodiment, as shown in FIGS. 2 and 3, the prism sheet 1 is configured by arranging a plurality of prisms 1a concentrically. Further, as shown in FIG. 2, the light source 2 is arranged on the inner side (on the side of the central axis CL1a of the plurality of concentric prisms 1a) than the inner edges 1a1 of the plurality of concentric prisms 1a.

  Therefore, in the display device of the first embodiment, when the light source 2 is turned on, the light emitted from the light source 2 is refracted by a plurality of concentric prisms 1a as shown in FIG. As shown in FIGS. 1 and 2, a light image 1b that appears to extend in the radial direction from the center of a plurality of concentric prisms 1a is formed, and this light image 1b functions as a pointer for the instrument.

  Specifically, in the display device according to the first embodiment, as shown in FIGS. 1 and 2, for example, when the light source 2 is arranged right above the central axis CL1a of the prism 1a, the light source 2 is turned on. Then, as shown in FIG. 1, a light beam image 1b that appears to extend right above the center of the prism sheet 1 is formed, and as a result, a vehicle speed of 80 km / h is displayed by this light beam image 1b. .

  Furthermore, in the display device according to the first embodiment, for example, when the light source 2 is arranged on the left side (see FIG. 1) of the central axis CL1a of the prism 1a, the prism sheet 1 is turned on when the light source 2 is turned on. A light beam image 1b that appears to extend from the center of the vehicle to the left (see FIG. 1) is formed, and as a result, a vehicle speed of 20 km / h is displayed by the light beam image 1b.

  In the display device according to the first embodiment, for example, when the light source 2 is arranged on the right side (see FIG. 1) of the central axis CL1a of the prism 1a, the prism sheet 1 is turned on when the light source 2 is turned on. A light beam image 1b that appears to extend right from the center of the vehicle (see FIG. 1) is formed, and as a result, the vehicle speed 140 km / h is displayed by this light beam image 1b.

  Furthermore, in the display device according to the first embodiment, as shown in FIG. 2, the central axis CL1a of the concentric prisms 1a and the central axis CL3 of the rotating body 3 are made to coincide with each other, and the light source 2 is mounted. The rotated body 3 is smoothly rotated by the motor 4 according to the increase or decrease of the vehicle speed. Therefore, according to the display device of the first embodiment, the light beam image 1b can be smoothly rotated, and the pointer of the instrument can be seen to rotate smoothly.

  In the display device of the first embodiment, as shown in FIG. 2, the light source 2 is located on the inner side of the inner edges 1a1 of the plurality of concentric prisms 1a (on the side of the central axis CL1a of the plurality of concentric prisms 1a). Is arranged. Therefore, according to the display device of the first embodiment, the light source 2 is arranged outside the inner edges 1a1 of the concentric prisms 1a (on the opposite side of the central axis CL1a of the concentric prisms 1a). The diameter of the rotator 3 on which the light source 2 is mounted can be made smaller than the case where the light source 2 is mounted, whereby the entire display device can be reduced in size.

  Furthermore, in the display device according to the first embodiment, as shown in FIGS. 2 and 3, a hole 1 c is formed in the central portion of the prism sheet 1. Therefore, according to the display device of the first embodiment, the light beam image 1b that appears to extend in the radial direction from the central portion of the concentric prisms 1a is the central axis CL1a of the concentric prisms 1a. The risk of appearing to extend to the opposite side across the gap can be avoided. Specifically, for example, as shown in FIG. 1, when the light source 2 is arranged right above the central axis CL <b> 1 a of the prism 1 a, the light image 1 b seems to extend right below the center of the prism sheet 1. It is possible to avoid such a risk by the hole 1c in the central portion of the prism sheet 1.

  In the display device according to the first embodiment, as shown in FIG. 2, a part of the rotating body 3 on which the light source 2 is mounted is inserted into the hole 1 c in the central portion of the prism sheet 1. Therefore, according to the display device of the first embodiment, the thickness dimension (depth) of the entire display device is larger than when all of the rotator 3 is disposed on the back side (right side in FIG. 2) of the prism sheet 1. The dimension (the dimension in the left-right direction in FIG. 2) can be reduced.

  Furthermore, in the display device of the first embodiment, for example, the light source 2 is turned off when the vehicle accessory switch is OFF, and the light source 2 is turned on when the vehicle accessory switch is ON.

  In the display device of the first embodiment, as shown in FIG. 2, the prism 1a is configured so that the cross-sectional shape of the prism 1a is substantially semicircular, but in the display device of the second embodiment, instead, In addition, the prism 1a may be configured such that the cross-sectional shape of the prism 1a is, for example, a polygon.

  In the display device according to the first embodiment, a light source that can emit light of only one color is used as the light source 2 mounted on the rotating body 3. In the display device according to the third embodiment, Instead, as the light source 2 mounted on the rotating body 3, a light source capable of selectively irradiating a plurality of different colors of light can be used. According to the display device of the third embodiment, it is possible to form a light beam image 1b of a color preferred by the driver of the vehicle as an indicator of the instrument.

  FIG. 4 is a cross-sectional view of the prism sheet 1 and the indicator portion 5 of the display device according to the fourth embodiment. In the display device of the first embodiment, as shown in FIG. 2, the prism sheet 1 and the indicator portion 5 are configured by separate members. However, in the display device of the fourth embodiment, instead of FIG. As shown in FIG. 1, the prism sheet 1 and the indicator portion 5 are formed of a single member. According to the display device of the fourth embodiment, the thickness dimension (depth dimension) of the entire display device can be made smaller than that of the display device of the first embodiment.

  FIG. 5 is a diagram showing the prism sheet 1 of the display device according to the fifth embodiment. Specifically, FIG. 5A is a front view of the prism sheet 1 of the display device of the fifth embodiment, and FIG. 5B is a sectional view of the prism sheet 1 of the display device of the fifth embodiment. In the display device of the first embodiment, as shown in FIG. 2, a plurality of concentric prisms 1a are formed on the back surface of the prism sheet 1 (the surface on the light source 2 side). Instead, as shown in FIG. 5B, a plurality of concentric prisms 1a are formed on the surface of the prism sheet 1 (the surface opposite to the light source 2).

  FIG. 6 is a diagram showing the prism sheet 1 of the display device of the sixth embodiment. Specifically, FIG. 6A is a front view of the prism sheet 1 of the display device of the sixth embodiment, and FIG. 6B is a cross-sectional view of the prism sheet 1 of the display device of the sixth embodiment. In the display device of the first embodiment, as shown in FIG. 2, a plurality of concentric prisms 1a are formed on the back surface of the prism sheet 1 (surface on the light source 2 side). In this display device, instead, a plurality of concentric prisms 1 a are formed on both surfaces of the prism sheet 1 as shown in FIG.

  Hereinafter, a seventh embodiment of the display device of the present invention will be described. The display device of the seventh embodiment is configured in the same manner as the display device of the first embodiment described above except for the points described below. Therefore, according to the display device of the seventh embodiment, substantially the same effects as those of the display device of the first embodiment described above can be obtained except for the points described later.

  FIG. 7 is a cross-sectional view of a display device according to a seventh embodiment. FIG. 8 is a front view of the prism sheet 11 in which a plurality of prisms 11a are arranged concentrically. That is, FIG. 8 is a view of the prism sheet 11 as viewed from the left side of FIG.

  In the display device according to the seventh embodiment, as shown in FIGS. 7 and 8, the prism sheet 11 is configured by concentrically arranging a plurality of prisms 11a. Further, the prism sheet 11 is arranged on the back side of the light source 2 (right side in FIG. 7), and the central axis CL11a of the plurality of concentric prisms 11a of the prism sheet 11 and the central axis CL3 of the rotating body 3 are made to coincide. ing.

  That is, in the display device of the seventh embodiment, as shown in FIG. 7, the light emitted from the light source 2 to the back side (right side in FIG. 7) is refracted by a plurality of concentric prisms 11 a of the prism sheet 11. Then, the light is transmitted through the prism sheet 1 and irradiated on the surface side (left side in FIG. 7).

  Therefore, according to the display device of the seventh embodiment, the light of the light image 1b can be made stronger than the display device of the first embodiment in which the prism sheet 11 is not provided. That is, the light of the light image 1b can be increased without increasing the light emission amount of the light source 2.

  FIG. 9 is a view showing the prism sheet 11 of the display device according to the eighth embodiment. Specifically, FIG. 9A is a cross-sectional view of the prism sheet 11 of the display device of the eighth embodiment, and FIG. 9B is a rear side view of the prism sheet 11 of the display device of the eighth embodiment. . In the display device according to the seventh embodiment, as shown in FIG. 7, a plurality of concentric prisms 11a are formed on the surface of the prism sheet 11 (the surface on the light source 2 side). Instead, as shown in FIG. 9A, a plurality of concentric prisms 11a are formed on the back surface of the prism sheet 11 (the surface opposite to the light source 2).

  FIG. 10 is a view showing the prism sheet 11 of the display device of the ninth embodiment. Specifically, FIG. 10A is a cross-sectional view of the prism sheet 11 of the display device of the ninth embodiment, and FIG. 10B is a rear side view of the prism sheet 11 of the display device of the ninth embodiment. . In the display device according to the seventh embodiment, as shown in FIG. 7, a plurality of concentric prisms 11a are formed on the surface of the prism sheet 11 (the surface on the light source 2 side). In this display device, instead, a plurality of concentric prisms 11 a are formed on both surfaces of the prism sheet 11 as shown in FIG.

  The tenth embodiment of the display device of the present invention will be described below. The display device of the tenth embodiment is configured in the same manner as the display device of the first embodiment described above, except for the points described below. Therefore, according to the display device of the tenth embodiment, substantially the same effects as those of the display device of the first embodiment described above can be obtained except for the points described later.

  FIG. 11 is a cross-sectional view of the display device of the tenth embodiment. In FIG. 11, reference numeral 21 denotes a mirror plate for reflecting light from the light source 2.

  In the display device of the tenth embodiment, as shown in FIG. 11, the mirror plate 21 is disposed on the back side of the light source 2 (right side in FIG. 11). That is, in the display device of the tenth embodiment, as shown in FIG. 11, the light emitted from the light source 2 to the back side (right side in FIG. 11) is reflected by the mirror plate 21, and then the prism sheet 1 is The light is transmitted and irradiated on the surface side (left side in FIG. 11).

  Therefore, according to the display device of the tenth embodiment, the light of the light image 1b can be made stronger than the display device of the first embodiment in which the mirror plate 21 is not provided. That is, the light of the light image 1b can be increased without increasing the light emission amount of the light source 2.

  Hereinafter, an eleventh embodiment of the display device of the present invention will be described. The display device of the eleventh embodiment is configured in the same manner as the display device of the seventh embodiment described above except for the points described below. Therefore, according to the display device of the eleventh embodiment, substantially the same effects as those of the display device of the seventh embodiment described above can be obtained except for the points described later.

  FIG. 12 is a cross-sectional view of the display device of the eleventh embodiment. In the display device of the eleventh embodiment, as shown in FIG. 12, the mirror plate 21 is disposed on the back side of the prism sheet 11 (right side in FIG. 12). That is, in the display device of the eleventh embodiment, as shown in FIG. 12, the light transmitted through the prism sheet 11 to the back side (right side in FIG. 12) is reflected by the mirror plate 21, and then the prism sheet 11 and The prism sheet 1 is transmitted through the front surface side (left side in FIG. 12) and irradiated to the front surface side (left side in FIG. 12).

  Therefore, according to the display device of the eleventh embodiment, the light of the light image 1b can be made stronger than the display device of the seventh embodiment in which the mirror plate 21 is not provided. That is, the light of the light image 1b can be increased without increasing the light emission amount of the light source 2.

  The twelfth embodiment of the display device of the present invention will be described below. The display device of the twelfth embodiment is configured in the same manner as the display device of the first embodiment described above, except for the points described below. Therefore, according to the display device of the twelfth embodiment, substantially the same effects as those of the display device of the first embodiment described above can be obtained except for the points described later.

  FIG. 13 is a cross-sectional view of the display device of the twelfth embodiment. In the display device of the first embodiment, as shown in FIG. 2, the light source 2 is arranged on the inner side (on the side of the central axis CL1a of the plurality of concentric prisms 1a) than the inner edges 1a1 of the plurality of concentric prisms 1a. However, in the display device of the twelfth embodiment, instead, as shown in FIG. 13, outside the outer edges 1a2 of the plurality of concentric prisms 1a (the central axis CL1a of the plurality of concentric prisms 1a). The light source 2 is arranged on the opposite side.

  In the display device according to the twelfth embodiment, as in the display device according to the first embodiment, when the light source 2 is turned on, the light emitted from the light source 2 has a plurality of concentric circles as shown in FIG. As a result, as shown in FIGS. 1 and 13, a light ray image 1b that appears to extend in the radial direction from the center of the plurality of concentric prisms 1a is formed. 1b functions as an indicator of the instrument.

  Further, in the display device of the twelfth embodiment, as in the display device of the first embodiment, as shown in FIG. 13, the central axis CL1a of the plurality of concentric prisms 1a and the central axis CL3 of the rotating body 3 are used. The rotating body 3 on which the light source 2 is mounted is smoothly rotated by the motor 4 in accordance with the increase / decrease of the vehicle speed. Therefore, according to the display device of the twelfth embodiment, similarly to the display device of the first embodiment, the light beam image 1b can be smoothly rotated, and the indicator of the instrument can be smoothly rotated. Can do.

  Further, in the display device of the twelfth embodiment, as in the display device of the first embodiment, a hole 1c is formed in the center of the prism sheet 1 as shown in FIG. Therefore, according to the display device of the twelfth embodiment, similarly to the display device of the first embodiment, the light beam image 1b that appears to extend in the radial direction from the center of the plurality of concentric prisms 1a. Thus, it is possible to avoid the possibility that the plurality of concentric prisms 1a may appear to extend to the opposite side with the central axis CL1a therebetween. Specifically, for example, as shown in FIG. 13, when the light source 2 is arranged directly above the central axis CL <b> 1 a of the prism 1 a, the light image 1 b appears to extend directly from the center of the prism sheet 1. It is possible to avoid such a risk by the hole 1c in the central portion of the prism sheet 1.

  In the display device of the twelfth embodiment, the surface of the rotator 3 is not mirror-finished, but in the display device of the thirteenth embodiment, instead, the surface side of the rotator 3 (left side in FIG. 13). It is also possible to apply a mirror finish to the surface of the film.

  That is, in the display device of the thirteenth embodiment, the light emitted from the light source 2 to the back side (the right side in FIG. 13) is reflected by the mirror surface of the rotating body 3 and then transmitted through the prism sheet 1. Irradiated on the front side (left side in FIG. 13). Therefore, according to the display device of the thirteenth embodiment, the light of the light image 1b can be made stronger than the display device of the twelfth embodiment that is not mirror-finished. That is, the light of the light image 1b can be increased without increasing the light emission amount of the light source 2.

  In the fourteenth embodiment, the above-described first to thirteenth embodiments can be appropriately combined.

  The display device of the present invention can be applied to instruments such as speedometers and tachometers such as automobiles, airplanes, and ships that display with a pointer.

It is a front view of the display apparatus of 1st Embodiment. It is sectional drawing along the AA line of FIG. It is a rear side view of prism sheet 1 in which a plurality of prisms 1a are arranged concentrically. It is sectional drawing of the prism sheet 1 and the parameter | index part 5 of the display apparatus of 4th Embodiment. It is the figure which showed the prism sheet 1 of the display apparatus of 5th Embodiment. It is the figure which showed the prism sheet 1 of the display apparatus of 6th Embodiment. It is sectional drawing of the display apparatus of 7th Embodiment. It is a front view of the prism sheet 11 in which the some prism 11a was arranged concentrically. It is the figure which showed the prism sheet 11 of the display apparatus of 8th Embodiment. It is the figure which showed the prism sheet 11 of the display apparatus of 9th Embodiment. It is sectional drawing of the display apparatus of 10th Embodiment. It is sectional drawing of the display apparatus of 11th Embodiment. It is sectional drawing of the display apparatus of 12th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Prism sheet 1a Prism 1a1 Inner edge 1b Ray image 1c Hole 2 Light source 3 Rotating body 4 Motor 5 Index part 5a Character 5b Scale 6 Housing

Claims (8)

  By irradiating light from a light source onto a prism sheet in which a plurality of prisms are concentrically arranged, a light ray image that appears to extend in the radial direction of the concentric circle from the center of the concentric circle is formed, and the light ray image In a display device using the indicator as a pointer of an instrument, a single light source is mounted on a rotating body, and the rotating body is smoothly rotated to make the indicator of the instrument appear to rotate smoothly. .   The display device according to claim 1, wherein a center axis of the plurality of prisms and a center axis of the rotating body are matched.   3. The display device according to claim 1, wherein the single light source is arranged on the inner side of the inner edges of the plurality of concentric prisms.   The display device according to claim 1, wherein a hole is formed in a central portion of the prism sheet.   The display device according to claim 4, wherein a part of the rotating body is inserted into the hole of the prism sheet.   Another prism sheet in which a plurality of prisms are concentrically arranged is arranged on the back side of the single light source, and the central axes of the plurality of prisms of the other prism sheet coincide with the central axis of the rotating body. The display device according to claim 3, wherein the display device is a display device.   The display device according to claim 1, wherein a mirror plate is disposed on a back side of the single light source.   The display device according to claim 1, wherein a light source capable of emitting a plurality of different colors of light is used as the single light source.

Images