JP2001134206A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can prevent a brightness unevenness in the width direction of light beam image with a constitution of a low cost. SOLUTION: In this display device 31, an optical device 3, in which a plurality of minute optical elements 9 of projected line-shape are formed in parallel to each other in the peripheral direction on a prescribed surface and periodically in a radial direction, is provided and pointer images slenderly stretched in the radial direction are formed by making light 11 from each light source 5 incident. A light shielding frame part 35, which is provided with plural luminescent window parts 35a which individually accommodate respective light sources 5 and individually exit light 11 emitted from respective light sources 5 toward the optical device 3, is installed on the front face sides of plural light sources 5. The inner peripheral surface 35c of each luminescent window part 35a forms a diffuse reflection surface of approximately paraboloidal shape which reflects the light 11 while diffusing. Thereby, the light quantity on the opening surface of the light 11 emitted from an opening part 35b of each luminescent window part 35a is equalized and a brightness unevenness of the pointer images can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for optically generating a pseudo pointer.

[0002]

2. Description of the Related Art In general, in a conventional display device, a pointer is mechanically rotated to display a vehicle speed or the like.

[0003]

However, the conventional display device requires a complicated driving mechanism for rotating the hands, and has a problem that the device configuration is complicated.

<Proposal Example> Therefore, the inventors of the present application have proposed the display devices shown in FIGS. The display device 1 includes an optical element 3, a plurality of light sources 5 disposed on the outer periphery of the optical element 3, and a dial display unit (not shown) for displaying a dial 7. Note that reference symbol A in FIG. 10 indicates the central axis of the optical element 3.

As shown in FIGS. 9 and 10, the optical element 3 is a plate-like member entirely formed of a translucent material, and has a rear surface (or a front surface) formed in a circumferential direction. A plurality of substantially ridge-shaped micro optical elements 9 connected in parallel to each other are formed concentrically and periodically in the radial direction. Here, of the two outer peripheral surfaces 9a and 9b intersecting the chevron of each micro optical element 9, the outer peripheral surface 9a on the outer peripheral side functions as an incident surface for receiving the light 11 from each light source 5 incident thereon,
The outer peripheral surface 9b on the inner peripheral side is the light 11 incident from the outer peripheral surface 9a.
Function as a reflection surface that reflects the light to the front side of the optical element 3.

As shown in FIGS. 9 and 10, the plurality of light sources 5 are regularly arranged on the substrate 13 along the circumferential direction in which the micro optical element 9 extends at the outer peripheral portion on the back surface side of the optical element 3. Has been established.

When the light 11 from each light source 5 passes through the optical element 3 from the back side to the front side, the light 11 is refracted and reflected by the outer peripheral surfaces 9 a and 9 b of each micro optical element 9 of the optical element 3. Accordingly, the light 11 emitted from the front side of the optical element 5 is elongated in the radiation direction corresponding to each light source 5 that is turned on from the center of curvature of the plurality of micro optical elements 9 (here, the center of the optical element 3). An extended pointer image (light image) 15 is generated.

Each light source 5 can be individually turned on and off, and a predetermined quantity of a quantity is assigned to each light source 5 and the light source 5 corresponding to the quantity is selectively turned on. By doing so, the pointer image 15 indicating the quantity value is displayed. Thus, analog quantity display can be performed without using a conventional mechanical configuration.

The display device 1 configured as described above is installed on an instrument panel 17 of a vehicle, for example, as shown in FIG. 11, and is used for displaying various quantities such as a vehicle speed and an engine speed. It has become.

<Problem of Proposed Example> However, in the display device 1 described above, the light source 5 uses a surface emitting type light emitting element such as a VFD (fluorescent display tube) or an EL element which emits light in a uniform light emitting surface. In this case, there is no problem. However, when a point-emission type light-emitting element (in particular, an LED) that emits light in a point-like manner is used as the light source 5, the following problem occurs.

That is, the LED is shown in FIGS.
As shown in the figure, since the dot-shaped LED chips 25 are embedded in the resin molded body 23 forming the light emitting surface 21, the brightness of the portion of the light emitting surface 21 on the LED chip 25 is lower than that of the surroundings. It is much higher, and the luminance unevenness on the light emitting surface 21 is large. For this reason, when the LED is used as the light source 5, as shown in FIG. 14A, the brightness of the generated pointer image 15 is uneven in the width direction (the brightness at the center in the width direction). Is higher than the surrounding area). FIG. 14B shows an ideal state of the light emitting surface 21 and the pointer image 15 without unevenness in luminance.

The uneven brightness of the pointer image 15 due to the uneven brightness of the light emitting surface 21 of the light source 5 is caused by the VFD or EL
The use of surface-emitting light-emitting elements such as elements can be improved, but those surface-emitting light-emitting elements are expensive,
There is a problem that the cost of the display device is increased.

In view of the above problems, it is an object of the present invention to provide a display device capable of preventing luminance unevenness in the width direction of a light image with a low-cost configuration.

[0014]

The technical means for achieving the above object is that a plurality of ridge-shaped micro-optical elements are formed on a predetermined surface in parallel with each other in the circumferential direction and periodically in the radial direction. And a plurality of light sources arranged regularly along a circumferential direction on a predetermined substrate, and irradiating predetermined light toward the plurality of micro optical elements. A display device configured to generate a light ray image extending in a radiation direction corresponding to each of the light sources that are turned on from the center of curvature of the plurality of micro optical elements of the optical element by the light that is emitted. A light-shielding frame member provided with a plurality of light-emitting windows for individually accommodating the light sources and individually emitting the light emitted by the light sources toward the optical element; The frame member and the opening of the light emitting window On an optical path of the light in, characterized in that a diffusing means for diffusing the light.

Preferably, the light from each of the light sources is reflected toward the optical element on an optical path of the light between each of the light sources and the opening of each of the light emitting windows of the light shielding frame member. It is preferable that a diffusion / reflection means for diffusing at the same time is provided, and the diffusion / reflection means also has a function as the diffusion means.

Preferably, an inner peripheral surface of each of the light emitting windows of the light shielding frame member has a function as the diffuse reflecting means, and the inner peripheral surface has a function as the diffuse reflecting means. May have a substantially parabolic shape in at least one of the circumferential direction and the radial direction.

Further, preferably, the optical element refracts and reflects the light from each of the light sources incident from the back side on the outer peripheral surface of each of the micro optical elements when the light is emitted from the front side. A transmission type optical element that generates a light image, wherein the plurality of light sources are disposed on an outer peripheral portion on a back surface side of the optical element, and the openings of the light emitting windows of the light shielding frame member are It is preferable that the diffusing unit is provided with a diffusing plate that is inclined inward in the radial direction of the optical element, and the diffusing unit is disposed so as to close the opening.

Preferably, the light shielding frame member is formed integrally with a supporting member for supporting the optical element.

Further, preferably, each of said light sources is LE
D is good.

[0020]

<First Embodiment> FIG. 1 is a sectional view of a display device according to a first embodiment of the present invention. In the display device 31 according to the present embodiment, portions corresponding to the display device 1 shown in FIGS. 9 to 11 described above are denoted by the same reference numerals, and description thereof is omitted.

In this display device 31, as shown in FIG. 1, a light-shielding frame member 35 is integrally formed on a support member 33 for supporting the optical element 3 as a light-shielding frame portion. The support member 33 is fixed to the substrate 13 with an adhesive or the like.

As shown in FIGS. 1 and 2, the light-shielding frame 35 accommodates each light source 5 individually, and
It has a plurality of light-emitting windows 35a for shielding light between the light sources, and is provided along the arrangement direction of the plurality of light sources 5. The opening 35b of each light emitting window 35a opens toward the center of the back surface side of the optical element 3. Each light-emitting window 35a is partitioned by a light-shielding wall 35e.

Light source 5 on the inner peripheral surface of each light emitting window 35a
The portion 35c located in front of (the right side in FIG. 1) (the portion hatched in a satin pattern in FIG. 2) 35c extends from the outer peripheral side so as to cover the light source 5, and reflects the light 11 at the same time. It is a diffuse reflection surface (diffuse reflection means) for diffusion.

As shown in FIG. 3, the diffuse reflection surface 35c has a substantially parabolic shape in a radial direction perpendicular to the circumferential direction in which the micro optical element 9 extends. The focal point of the substantially parabolic shape is located at the light emitting portion (here, the LED chip) of the light source 5, and the parabolic axis B is set to the radially inner portion (here, the rear surface side surface of the optical element 3). The optical element 3 is set so as to intersect with a substantially central portion between the innermost minute optical element 9 and the outermost minute optical element 9 on the back surface of the optical element 3.

As a result, the light 11 emitted radially from each light source 5 is transmitted to the diffuse reflection surface 35c of each light emitting window 35a.
When the light is reflected toward the optical element 3, the light is condensed and diffused in the radial direction of the micro optical element 9 and is given directivity in the direction of the parabolic axis B. Part 35
b, the light is emitted toward the micro optical element 1 with a uniform light amount in the opening plane of the opening 35b. As a result, as shown in FIG.
The pointer image 15 having a width corresponding to the width of the opening 35b is generated with uniform luminance in the width direction.

Here, the diffuse reflection surface 35c is formed by blasting the above-mentioned portion (the portion with hatching of matte shape in FIG. 2) of the inner peripheral surface of the light emitting window portion 35a formed in a substantially parabolic shape by blasting. After forming into a shape, a metal film such as aluminum is vapor-deposited (or plated) on the portion to form a reflective surface having a fine unevenness having a diffusion function. Here, the diffuse reflection surface 35c is formed by forming a reflection surface having fine irregularities, but a diffusion film (diffusion means) for diffusing the light 11 is provided on a normal smooth reflection surface. Thereby, the diffuse reflection surface 35c may be formed.

As shown in FIGS. 2 and 3, the light 35 emitted from the light source 5 is not reflected or diffused by the diffuse reflection surface 35c in the opening 35b of each light emitting window 35a. In addition, a light-shielding portion 35d that closes a region (a rear-side region) of the opening 35b on the substrate 13 side is provided integrally so as to shield the light 11 that directly enters the optical element 3.

Further, in this embodiment, as shown in FIG. 1, the dial display section 37 for displaying the dial 7 is provided with a dial 7
A display pattern member 37a in which a light-transmitting pattern corresponding to the above is formed in the light-shielding region, a light source (here, LED) 37b for illuminating the light-transmitting pattern formed in the display pattern member 37a, and a light source 37b And a light guide 37c for guiding the emitted light to a light-transmitting pattern.

As described above, according to the present embodiment, the light 11 emitted from each light source 5 is diffused by the diffuse reflection surface 35c formed on the inner peripheral surface of each light emission window 35a of the light shielding frame 35. Therefore, even when an inexpensive point light emitting type light emitting element such as an LED is used as the light source 5 as in the present embodiment, each light emitted through the opening 35b of each light emitting window 35a is also used. The light amount of the light 11 from the light source 5 can be made uniform within the opening surface of the opening 35a, so that an expensive surface-emitting type light emitting element such as a VFD or an EL element is not used as the light source 5 and the light amount can be reduced. With the configuration of the cost, it is possible to prevent luminance unevenness in the width direction of the pointer image 15.

Further, since the space between the light sources 5 is shielded by the light-shielding frame 35, the light of the other light source 5 enters the adjacent light source 5 and the pointer image 1 corresponding to the light source 5 which is originally turned off.
5 can be prevented from being erroneously generated.

Further, since the diffuse reflection surface 35c having two functions of reflection and light diffusion is used, the number of components can be reduced as compared with the case where two components of reflection means and diffusion means are used. There are advantages.

Further, the diffuse reflection surface 35c is formed in a substantially parabolic shape in the radial direction of the micro optical element 9, and the light 11 from the light source 5 is reflected and scattered by the diffuse reflection surface 35c. At this time, the light is condensed in the radial direction and is incident on the optical element 3 with directivity in the direction of the parabolic axis B, so that the brightness of the generated pointer image 15 is improved. be able to.

Further, since the light shielding frame 35 is formed integrally with the supporting member 33 for supporting the optical element 3, the number of components can be reduced and the configuration can be simplified.

Further, since an inexpensive LED is used as the light source 5, the display device 31 can be configured at low cost.

<Second Embodiment> FIG. 4 is a perspective view showing the structure of a light-shielding frame 35 used in a display device according to a second embodiment of the present invention. In the light-shielding frame 35 according to the present embodiment, portions corresponding to the light-shielding frame 35 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 4, in the light-shielding frame portion 35 according to the present embodiment, each of the diffuse reflection surfaces 35c is formed so that not only the radial direction of the micro optical element 9 but also the micro optical element 9 is extended. It also has a substantially parabolic shape in the circumferential direction. Accordingly, when the light 11 emitted from each light source 5 is reflected by each diffuse reflection surface 35c, the light 11 can be collected not only in the radial direction but also in the circumferential direction. It has become.

Thus, according to the present embodiment, the same effect as that of the first embodiment can be obtained, and the brightness of the pointer image 15 generated can be further increased.

<Third Embodiment> FIG. 5 is a sectional view of a display device according to a third embodiment of the present invention. In the display device 41 according to the present embodiment, portions corresponding to those of the display device 31 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this display device 41, as shown in FIGS. 5 and 6, a light-shielding frame member 43 is provided instead of the above-described light-shielding frame portion 35, and a diffusion plate (diffusion means) is provided instead of the diffuse reflection surface 35c. 45 are provided.

The light-shielding frame members 43 are provided on the substrate 13 along the direction in which the plurality of light sources 5 are arranged. It has a window 43a. Each light emitting window 43
The front-side opening 43b of FIG. 1A is provided so as to be inclined such that the opening surface faces radially inward on the back side of the optical element 3. Preferably, an opening surface of the opening 43b is provided with a diffusion plate 45 described later installed so as to close the opening 43b.
The normal direction passing through the center of the optical element 3 is inclined such that it intersects substantially the center of the innermost minute optical element 9 and the outermost minute optical element 9 on the back side of the optical element 3. Good. The light-shielding frame member 43 is fixed on the substrate 13 with an adhesive or the like.

On the front side of the light shielding member 43, each light emitting window 4
A diffusion plate 45 is provided so as to close the opening 43b of 3a. The diffusion plate 45 diffuses the light 11 emitted from each light source 5 to make the light amount in the opening surface of the opening 43b uniform. Here, a diffusion plate 45 having a haze value indicating the degree of diffusion of 81.4% and a light transmittance of 64.5% is used.

Then, as shown in FIG. 14B, the pointer image 15 having a width corresponding to the width of the opening 43b of each light emitting window 43a is generated with uniform luminance in the width direction. Has become. Also, the opening 43b of each light emitting unit 43a is
The light 11 diffused by the diffusion plate 45 is efficiently incident on the optical element 3 and is provided at the outer edge of the optical element 3 because the optical element 3 is provided to be inclined radially inward on the rear surface side of the optical element 3. The light enters the optical element 3 with a uniform light amount from the portion to the center.

Thus, according to the present embodiment, the diffusion plate 45 disposed on the front side of the light shielding frame member 43 allows
Since the light 11 emitted from each light source 5 is diffused, even when an inexpensive point light emitting element such as an LED is used as the light source 5 as in the present embodiment, each light emitting window portion 43
1. Light 1 from each light source 5 emitted through the opening 43b of FIG.
1 can be made uniform within the opening surface of the opening 35a, and thus, a low-cost configuration can be achieved without using an expensive surface-emitting type light-emitting element such as a VFD or an EL element for the light source 5. Brightness unevenness in the width direction of the pointer image 15 can be prevented.

Since the space between the light sources 5 is shielded by the light-shielding frame member 43, the light 11 of another light source 5 enters the adjacent light source 5 and the pointer image 15 corresponding to the light source 5 which is originally turned off. Can be prevented from being generated erroneously.

Further, an opening 43b of each light emitting section 43a is provided.
Is provided to be inclined inward in the radial direction on the back side of the optical element 3, so that the light 11 diffused by the diffusion plate 45 can be efficiently and uniformly transmitted to the optical element 3 in the radial direction. The pointer image 15 can be made incident, thereby improving the luminance of the pointer image 15 and making the luminance in the longitudinal direction uniform.

Since an inexpensive LED is used as the light source 5, the display device 41 can be constructed at low cost.

In this embodiment, as in the first embodiment, the light-shielding frame member 43 may be formed integrally with the support member 33.

<Fourth Embodiment> FIG. 7 is a sectional view of a display device 51 according to a fourth embodiment of the present invention. In the display device 41 according to the present embodiment, the light shielding frame member 35 according to the first embodiment is used instead of the light shielding frame member 43 according to the second embodiment.

However, in the present embodiment, each light emitting window 35
The inner peripheral surface 35c of a is not a diffuse reflection surface described above, but a mere reflection surface of a substantially parabolic shape. Instead, in the present embodiment, as shown in FIGS. 7 and 8, the opening 35 b of each light emitting window 35 a is formed such that its opening surface is radially inward on the rear surface side of the optical element 3 (here, the innermost surface). (A substantially central portion between the peripheral minute optical element 9 and the outermost peripheral minute optical element 9) and
A diffusion plate 45 is provided on the inner peripheral side of the light shielding frame member 35 so as to close the opening 35b. Preferably, the reflection surface 35c of each light emitting window 35a is formed by forming a metal film or the like and mirror-finished. Further, the diffusion performance may be further improved by forming the reflection surface 35c as a diffusion reflection surface as in the first embodiment.

With this configuration, according to the present embodiment, the same effects as those of the third embodiment can be obtained, and the light 11 emitted from the light source 5 toward the optical element 3 directly enters the diffusion plate 45. Meanwhile, light 11 emitted from the light source 5 toward the front side (the right side in FIG. 7) and the outer periphery side (the upper side in FIG. 7)
Is condensed on the reflection surface 35c, is reflected on the optical element 3 side, and is incident on the diffusion plate 45. Accordingly, the amount of light 11 diffused by the diffusion plate 45 and incident on the optical element 3 can be increased, and the pointer image 15 can be generated with uniform luminance in the width direction and higher luminance. I have.

<Modification> In each of the above embodiments,
Although the micro optical element 9 is provided on the back surface of the optical element 3,
It may be provided on the front surface of the optical element 3.

In each of the above-described embodiments, the light source 5 is provided on the back surface side of the optical element 3 and the light 11 from the light source 5 is transmitted through the optical element 3 to generate the light beam image 15. The light source 5 is disposed facing the outer peripheral side surface of the optical element 3 (or on the front side), and light 11 from the light source 5 is made to enter the optical element 3 from the outer peripheral side surface (or from the front side surface). The light image 15 may be generated by causing the light to be reflected forward (here, totally reflected) by the outer peripheral surface 9 b of the micro optical element 9 and emitted forward from the front surface of the optical element 3.

[0053]

According to the first to sixth aspects of the present invention, each light source emits light by the diffusing means provided on the optical path between each light source and the opening of the light emitting window of the light shielding frame member. Since light is diffused, L
Even when an inexpensive point emission type light emitting element such as an ED is used,
The amount of light emitted from each light source through the opening of each light-emitting window can be made uniform within the opening surface of the opening, so that the light source can be an expensive surface-emitting type such as a VFD or an EL element. Without using the light emitting element described above, it is possible to prevent luminance unevenness in the width direction of the light beam image with a low-cost configuration.

Further, since each light source is shielded from light by the light-shielding frame member, light from another light source enters the adjacent light source, and a pointer image corresponding to the light source which is originally turned off is erroneously generated. Can be prevented.

According to the second aspect of the present invention, since the diffuse reflection means having the two functions of reflection and light diffusion is used, compared with the case where two parts of the reflection means and the diffusion means are used. This has the advantage that the number of parts can be reduced.

According to the third aspect of the present invention, the cross-sectional shape of the inner peripheral surface of each light-emitting window of the light-shielding frame member having a function as a diffuse reflecting means is at least one of the circumferential direction and the radial direction. On the other hand, since it has a substantially parabolic shape, when the light from each light source is reflected and diffused on its inner peripheral surface, it is focused on at least one of the circumferential direction and the radial direction ( It can be incident on the optical element (with directivity), which can improve the brightness of the generated light image.

According to the fourth aspect of the present invention, the opening of each light-emitting window of the light-shielding frame member is provided so as to be inclined inward in the radial direction of the optical element, and the diffusion plate constituting the diffusion means is provided. But,
Since it is arranged so as to close the opening, the light from the light source diffused by the diffusion plate can be efficiently incident on the optical element with a uniform light amount in the radial direction,
Thereby, it is possible to improve the brightness of the light beam image and to make the brightness in the longitudinal direction uniform.

According to the fifth aspect of the present invention, since the light-shielding frame member is formed integrally with the supporting member for supporting the optical element, the number of parts can be reduced and the configuration can be simplified.

According to the invention of claim 6, since inexpensive LEDs are used as each light source, a display device can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a display device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a light shielding frame used in the display device of FIG. 1;

FIG. 3 is a sectional view of a main part of the display device of FIG. 1;

FIG. 4 is a partially cutaway perspective view of a light shielding frame used in a display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a display device according to a third embodiment of the present invention.

6 is a partially cutaway perspective view of a light shielding frame member used in the display device of FIG.

FIG. 7 is a sectional view of a display device according to a fourth embodiment of the present invention.

FIG. 8 is a partially cutaway perspective view of a light shielding frame member used in the display device of FIG. 7;

FIG. 9 is a front view of a display device according to a proposal example.

FIG. 10 is a cross-sectional view of the display device of FIG.

FIG. 11 is a front view showing an installation state of the display device of FIG. 9;

FIG. 12 is a side view of an LED used in the display device of FIG.

FIG. 13 is a diagram showing a light emitting surface of the LED of FIG.

14A is a diagram illustrating a state of a light emitting surface and a pointer image of the LED in FIG. 12, and FIG. 14B is a diagram illustrating an ideal state of a light emitting surface and a pointer image;

[Explanation of symbols]

 Reference Signs List 3 optical element 5 light source 9 micro optical element 13 substrate 15 pointer image 31, 41, 51 display device 33 support member 35, 43 light shielding frame part, light shielding frame member 35a, 43a light emitting window part 35b, 43b opening part 35c diffuse reflection surface, Reflective surface 45 Diffuser

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Imoto 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in Harness Research Institute, Ltd. (Reference) 3D044 BA03 BA21 BA27 BD02 BD13 5C096 AA04 AA05 AA27 BA02 BA04 BB18 BC02 BC15 BC17 CA06 CA15 CA17 CA26 CB01 CC06 CC22 CE04 CE05 CE19 CE25 CF02 DC02 DC04 DC19 DC21 FA11 5G435 AA02 AA03 AA17 BB04 CC04 DD03 DD09 DD12 EE01 EE05 EE12 EE27 FF02 FF03 FF17 GG17 GG17 GG17 GG11

Claims (6)

[Claims] 1. An optical element in which a plurality of ridge-shaped micro optical elements are formed on a predetermined surface in a circumferential direction parallel to each other and periodically in a radial direction, and on a predetermined substrate along the circumferential direction. A plurality of light sources that are regularly arranged and emit predetermined light toward the plurality of micro optical elements, and the plurality of micro optical elements of the optical element are provided by the light emitted from each of the light sources. A display device that generates a light ray image extending in a radiation direction corresponding to each of the light sources that are lit from the center of curvature of the light source, wherein each of the light sources is individually accommodated and each of the light sources emits light. A light-shielding frame member provided with a plurality of light-emitting windows for individually emitting the light toward the optical element is provided, and the light between each light source and an opening of the light-emitting window of the light-shielding frame member is provided. Diffusing means for diffusing the light on the optical path of Display device, wherein a provided. 2. An optical path of the light between each of the light sources and the opening of each of the light emitting windows of the light shielding frame member.
A diffuse reflection unit that reflects the light from each of the light sources toward the optical element and simultaneously diffuses the light toward the optical element is provided, and the diffuse reflection unit also has a function as the diffusion unit. 2. The display device according to 1. 3. An inner peripheral surface of each of the light emitting windows of the light-shielding frame member has a function as the diffuse reflector, and a cross-sectional shape of the inner peripheral surface having a function as the diffuse reflector. The display device according to claim 2, wherein the display device has a substantially parabolic shape in at least one of the circumferential direction and the radial direction. 4. The optical element, when emitting the light from each of the light sources incident from the back side from the front side, refracts and reflects the outer peripheral surface of each of the micro optical elements to thereby form the light beam image. A plurality of light sources, the plurality of light sources being disposed on an outer peripheral portion on a back surface side of the optical element; and the openings of the respective light-emitting windows of the light-shielding frame member being formed of the optical element. 2. The device according to claim 1, wherein the device is provided to be inclined inward in the radial direction of the element, and the diffusion unit is configured by a diffusion plate disposed so as to close the opening. 3.
The display device according to claim 1. 5. The display device according to claim 1, wherein the light-shielding frame member is formed integrally with a support member that supports the optical element. 6. The display device according to claim 1, wherein each of the light sources is an LED.