JP7245442B2 - head up display - Google Patents

Description

The present invention relates to a head-up display mounted on a vehicle or the like.

A head-up display has a display device for displaying a display image. This display device has, for example, a display panel and a hot mirror that absorbs part of external light that irradiates the display panel. The hot mirror is arranged in front of the display panel via packing in order to buffer contact with the display panel. The packing has an opening that exposes the display panel.

JP 2013-174855 A

When it is required to display a large display image on the head-up display, it is conceivable to increase the display area of the display panel. When the display area is enlarged, it is necessary to enlarge the opening of the packing according to the display area. As a result, the area of the packing for holding the hot mirror becomes smaller, making it difficult to reliably hold the hot mirror.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a head-up display capable of reliably holding a hot mirror while securing a large display area.

A head-up display according to the present invention has a display panel that forms display light, a hot mirror that transmits the display light, and a display device that emits the display light. , the display device comprises: a peripheral portion exposing the display panel and having an upper edge and a lower edge; a support frame provided on the peripheral portion for supporting the hot mirror ; and a hot mirror and points provided on the support frame. and at least three supporting projections in contact with each other, wherein the supporting frame has an arc portion that forms the upper edge in an arc shape that protrudes toward the lower edge side, and at least one of the supporting projections: It is provided in the circular arc portion.

In the head-up display according to the present invention, it is possible to reliably hold the hot mirror while ensuring a large display area.

Schematic which shows embodiment of the head-up display which concerns on this invention. Sectional drawing of a head-up display. FIG. 3 is an exploded perspective view for explaining a display panel unit; The front view of a display panel unit. (a) is a cross-sectional view taken along line VV in FIG. 4, and (b) is an enlarged view around the holder-side support projection and the packing-side support projection in FIG. 5(a). Sectional drawing which follows the VI-VI line of FIG. The block diagram which looked at the holder from the back side. The block diagram which looked at the hot mirror packing from the front side.

An embodiment of a head-up display according to the present invention will be described with reference to the accompanying drawings. A head-up display according to the present invention is mounted, for example, on a vehicle such as an automobile or a motorcycle, or on a ship. In this embodiment, an example in which a head-up display according to the present invention is mounted on an automobile will be described.

FIG. 1 is a schematic diagram showing an embodiment of a head-up display according to the invention.
FIG. 2 is a cross-sectional view of the head-up display 1. FIG.

A head-up display 1 (HUD 1 ) is arranged inside an instrument panel 11 of the vehicle 10 . The HUD 1 displays a virtual image V by reflecting display light L toward a driver (viewer) 14 of the vehicle 10 by a windshield 13 of the vehicle 10, which is a projection member. That is, the HUD 1 emits display light L emitted from the display device 20 to the windshield 13 . The HUD 1 allows the driver 14 to visually recognize the display image (virtual image) V obtained by this emission. Thereby, the driver 14 can observe the virtual image V superimposed on the scenery.

As shown in FIG. 2, the HUD 1 mainly includes a display device 20 that emits display light L, a plane mirror 30, a concave mirror 40, and a case 50. As shown in FIG.

The display device 20 mainly has a light source 21 , a display panel 22 and a hot mirror 23 . The light source 21 is a light emitting diode mounted on the wiring board 24 . The display panel 22 is a TFT type liquid crystal display element. The display panel 22 is arranged in front of the light source 21 (directly above in the drawing) so as to transmit illumination light from the light source 21 and form display light L (display image). That is, the light source 21 is arranged on the back side (right under the drawing) of the display panel 22, and the display panel 22 displays predetermined information (for example, the speed of the vehicle 10 and the number of engine revolutions) by the light emitted from the light source 21. . The hot mirror 23 transmits display light L displayed on the display panel 22 and reflects (and absorbs) infrared rays. The hot mirror 23 is arranged on the front side of the display panel 22 .

The display device 20 is fixed and held in such a position and orientation that the plane mirror 30 faces the surface from which the display light L is emitted, and the optical axis of the display light L intersects the plane mirror 30 .

The plane mirror 30 has a base material made of, for example, a synthetic resin material, and a reflective film formed on the surface of the base material by vapor deposition or the like. The plane mirror 30 reflects the display light L output from the display device 20 toward the concave mirror 40 .

The concave mirror 40 has a base material made of, for example, a synthetic resin material, and a reflective film formed on the surface of the base material by vapor deposition or the like. The concave mirror 40 reflects the display light L reflected by the plane mirror 30 toward the windshield 13 . The concave mirror 40 has a function as a magnifying glass, magnifies the display image according to the display light L, and reflects it onto the windshield 13 . Thereby, the driver 14 visually recognizes the virtual image V in which the display image is enlarged.

The case 50 is made of, for example, a black light-shielding synthetic resin material, and is formed in a substantially box shape. The case 50 has a space portion 51 , an opening window portion 52 , and a translucent cover 53 arranged in this opening window portion 52 . The space 51 is an internal space of the case 50 and holds and accommodates the display device 20 , the plane mirror 30 and the concave mirror 40 . The opening window portion 52 is an opening provided on the concave mirror 40 above the position where the concave mirror 40 is arranged (on the windshield 13 side). The light-transmitting cover 53 is made of a light-transmitting synthetic resin material such as acrylic resin, and is formed in a curved shape (curved surface shape).

Next, the support structure of the display panel 22 and the hot mirror 23 of the display device 20 will be described in detail.

FIG. 3 is an exploded perspective view for explaining the display panel unit 60. FIG.
FIG. 4 is a front view of the display panel unit 60. FIG.
FIG. 5(a) is a cross-sectional view taken along line VV in FIG. 4, and (b) is an enlarged view around the holder-side support projection 75a and the packing-side support projection 95a in FIG. 5(a).
6 is a cross-sectional view taken along line VI-VI of FIG. 4. FIG.
FIG. 7 is a configuration diagram of the holder 70 viewed from the rear side.
FIG. 8 is a configuration diagram of the hot mirror packing 90 viewed from the front side.

In the following description, "front side" means the left side in FIG. 3 and the front side in FIG. "Rear side" means the right side in FIG. 3 and the back side in FIG. Also, "upper" means upward in FIGS. 3 and 4 . "Lower" means downward in FIGS.

The display panel unit 60 has a display panel 22 , a hot mirror 23 , a holder 70 , a cover 78 , a hot mirror packing 90 and a diffusion plate 80 . The display panel unit 60 is a component (unit) in which the display panel 22 , the hot mirror 23 , and the diffusion plate 80 are integrally housed in the space formed by the holder 70 and the cover 78 . The display panel unit 60 accommodates the hot mirror 23, the display panel 22, and the diffusion plate 80 in order from the front side to the back side (direction from the holder 70 to the cover 78).

The holder 70 is made of, for example, a black light-shielding synthetic resin material, and supports the display panel 22 together with the hot mirror 23 and the hot mirror packing 90 . The holder 70 has a holder-side opening 71, an L-shaped rib 74, and holder-side support projections 75a, 75b, and 75c.

The holder-side opening 71 is formed by a peripheral portion 72 and exposes the hot mirror 23 . The peripheral edge portion 72 has an upper edge 72a and a lower edge 72b. The (shape of) the holder side opening 71 has substantially the same shape as the packing side opening 91 described later. That is, the holder 70 has an arcuate portion 73 that forms an arcuate shape that protrudes from the upper edge 72a toward the lower edge 72b. The holder 70 forms the holder side opening 71 such that the opening area of the holder side opening 71 has a tapered shape that gradually increases along the traveling direction of the display light L (the direction from the back surface to the front surface of the holder 70). ing. Since the holder-side opening 71 has substantially the same shape as the packing-side opening 91, it reliably covers the hot mirror 23 and prevents it from being unintentionally exposed. Therefore, the holder 70 can prevent the end surface 23 a of the hot mirror 23 from being seen by the driver 14 .

The L-shaped ribs 74 are provided on the rear surface of the holder 70 at locations where the four corners of the hot mirror 23 are arranged. The L-shaped rib 74 supports the hot mirror 23 in the plane orthogonal to the display light L. As shown in FIG.

Holder-side support projections 75a, 75b, and 75c (simply referred to as holder-side support projections 75 when not distinguished) are provided on the rear surface of the holder 70 and inside the L-shaped rib 74. As shown in FIG. The holder-side support protrusion 75 is a protrusion that comes into contact (point contact) with the hot mirror 23 in order to support the hot mirror 23 in the direction in which the display light L travels. The holder-side support projection 75a is provided at a portion 76a of the circular arc portion 73 on the side of the upper edge 72a, which is most convex toward the lower edge 72b in the width direction of the upper edge 72a. The holder-side support projections 75b and 75c are provided on the lower edge 72b side and at positions close to both ends 76b and 76c (L-shaped rib 74) in the width direction of the lower edge 72b.

The cover 78 is fitted and fixed to the holder 70 from the rear side of the holder 70 to fix and hold the hot mirror 23 , the hot mirror packing 90 , the display panel 22 and the diffusion plate 80 in the holder 70 . The cover 78 is made of, for example, a black light-shielding synthetic resin material. The cover 78 has a substantially rectangular cover-side opening 79 that serves as an optical path for light from the light source 21 .

The hot mirror packing 90 supports the hot mirror 23 while buffering the contact between the display panel 22 and the hot mirror 23 on the back side of the hot mirror 23 . The hot mirror packing 90 is a black member made of ethylene propylene diene rubber (EPDM), for example. The hot mirror packing 90 has a packing-side opening 91, a support frame 94, and three packing-side support protrusions 95a, 95b, and 95c.

The packing-side opening 91 is formed by a peripheral portion 92 and exposes the display panel 22 . The packing-side opening 91 has substantially the same shape as the display area 25 ( FIG. 4 ) of the display panel 22 . The peripheral portion 92 has an upper edge 92a and a lower edge 92b. The packing-side opening 91 is surely positioned outside the display area 25 of the display panel 22 so as to reduce the possibility that the end surface 22a of the display panel 22 reflects external light and the reflected light is visually recognized by the driver 14. It is formed so as to cover the end face 22a by being covered.

The support frame 94 is provided on the peripheral edge portion 92 of the packing-side opening 91 and is a portion that supports the hot mirror 23 . Specifically, the support frame 94 supports the hot mirror 23 supported by the L-shaped ribs 74 of the holder 70 in a plane orthogonal to the display light L by sandwiching the hot mirror 23 from the back side. The support frame 94 has an arc portion 93 that forms the upper edge 92a into an arc shape that protrudes toward the lower edge 92b.

The packing-side support projections 95a, 95b, and 95c (simply referred to as the packing-side support projection 95 when not distinguished) are provided on the support frame 94, and support the hot mirror 23 in the traveling direction of the display light L. It is a protrusion that makes contact (point contact) with the hot mirror 23 . The packing-side support projection 95a is provided at a portion 96a of the arc portion 93 on the side of the upper edge 92a, which is most protruding toward the lower edge 92b in the width direction of the upper edge 92a. The packing-side support projections 95b and 95c are provided on the side of the lower edge 92b at positions near both ends 96b and 96c in the width direction of the lower edge 92b. By providing the packing-side support projection 95a at the widest position of the support frame 94 on the side of the upper edge 92a, productivity can be improved. Further, since the packing-side support projection 95a is provided at the center of the upper edge 92a in the width direction, the hot mirror 23 is supported in good balance with the packing-side support projections 95b and 95c.

The holder-side support projection 75 and the packing-side support projection 95 are provided at positions opposed to each other with the hot mirror 23 interposed therebetween, and support the hot mirror 23 by sandwiching it. For example, as shown in FIG. 5B, the holder-side support projection 75a and the packing-side support projection 95a are opposed to each other with the hot mirror 23 interposed therebetween, and support the hot mirror 23 by sandwiching it. At least three holder-side support projections 75 and packing-side support projections 95 need only be provided in order to support the hot mirror 23 in the direction in which the display light L travels. At least one holder-side support projection 75 (holder-side support projection 75a) and one packing-side support projection 95 (packing-side support projection 95a) may be provided on the circular arc portions 73, 93.

The diffuser plate 80 is made of, for example, transparent or translucent translucent (transmissive) polycarbonate resin containing a diffusing material, and is translucent milky white. The diffusion plate 80 diffuses and transmits the light from the light source 21 .

In the HUD 1 having such a display panel unit 60, the outer shape of the display panel unit 60 (display panel 22) is enlarged in relation to the dimensions of the entire device of the HUD 1 and the arrangement of the display panel unit 60 and other components. It may be requested to enlarge the display area 25 of the display panel 22 without having to do so. In order to enlarge the display area 25, it is also required to enlarge the packing side opening 91 through which the display light L of the display panel 22 passes. However, if the packing side opening 91 is enlarged without enlarging the outer shape of the display panel unit 60, it becomes difficult to secure a space for providing a structure for supporting the hot mirror 23 in the hot mirror packing 90. FIG.

Here, in order to allow the driver 14 to visually recognize an appropriate virtual image V without distortion, the HUD 1 is arranged such that the upper edge of the display image (display light L) displayed on the display panel 22 is convex toward the lower edge side. is distorted and displayed. This distorted display image is reflected and transmitted through the plane mirror 30 , the concave mirror 40 and the windshield 13 , so that the driver 14 visually recognizes the distorted display image as a proper virtual image V without distortion.

If the shape of the packing-side opening 91 is a quadrangle having four straight sides, the shape of the packing-side opening 91 corresponds to a straight line connecting the four corners of the display image. That is, as a result of forming the upper edge of the display image in an arc shape, the packing-side opening 91 is formed up to the downwardly convex arc portion where the display image is not formed and the display light L does not need to pass. .

Therefore, in the HUD 1 of this embodiment, the shape of the packing-side opening 91 is not a quadrangle having four straight sides, but a circular arc portion 93 is formed on the upper edge 92a side in accordance with the outer shape (display area 25) of the display image. A shape with As a result, the packing-side support protrusion 95a, which is a structure for supporting the hot mirror 23, can be provided on the arc portion 93 even when the display image is enlarged and the size of the packing-side opening 91 is increased. Therefore, the HUD 1 can reliably hold the hot mirror 23 while ensuring a large display area 25 .

Also, the shape of the packing-side opening 91 is made substantially the same as the shape of the display area 25 of the display panel 22 . Thereby, HUD1 can reduce the reflection of the external light in the end surface 22a of the display panel 22, without widening the packing side opening 91 more than necessary. Moreover, the illumination light from the light source 21 is reflected by the end surface 22a of the display panel 22, and it is possible to provide the HUD 1 in which there is no possibility that the reflected light will reach the driver's 14 eyes.

Further, the width of the support frame 94 is reduced as the opening of the packing-side opening 91 is widened, and the distance between the peripheral portion 92 and the end surface 23a of the hot mirror 23 is reduced. On the other hand, the shape of the holder side opening 71 of the holder 70 is made substantially the same shape as the packing side opening 91, and the end surface 23a of the hot mirror 23 is reliably shielded. Thereby, the HUD 1 can prevent the end surface 23 a of the hot mirror 23 from being viewed by the driver 14 .

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

1 Head-up display (HUD)
10 Vehicle 13 Windshield 14 Driver 20 Display device 21 Light source 22 Display panel 22a End face 23 Hot mirror 23a End face 24 Wiring board 25 Display area 30 Plane mirror 40 Concave mirror 50 Case 51 Space 52 Opening window 53 Translucent cover 60 Display panel Unit 70 Holder 71 Holder-side opening 72 Peripheral edge 72a Upper edge 72b Lower edge 73 Arc portion 74 L-shaped ribs 75, 75a, 75b, 75c Holder-side support projection 76a Locations 76b, 76c Both ends 78 Cover 79 Cover-side opening 80 Diffusion plate 90 Hot mirror packing 91 Packing-side opening 92 Peripheral edge 92a Upper edge 92b Lower edge 93 Arc portion 94 Support frames 95, 95a, 95b, 95c Packing-side support projection 96a Locations 96b, 96c Both ends L Display light V Virtual image

Claims (6)

A display device having a display panel that forms display light and a hot mirror that transmits the display light, and that emits the display light,
The display device includes a peripheral edge portion exposing the display panel and having an upper edge and a lower edge, a support frame provided on the peripheral edge portion for supporting the hot mirror , and a support frame provided on the support frame and making point contact with the hot mirror . and at least three support projections for
The support frame has an arc portion that forms the upper edge in an arc shape that protrudes toward the lower edge,
A head-up display, wherein at least one of the support protrusions is provided on the arc portion. The head-up display according to claim 1, wherein the hot mirror is a hot mirror arranged on the front side of the display panel. The peripheral portion, the support frame, and the support projections are
2. A head-up display according to claim 1, wherein the hot mirror is formed on a packing that supports and buffers the display panel and the hot mirror on the back side of the hot mirror . 4. The head according to any one of claims 1 to 3, wherein the support protrusion provided on the arc portion is provided at a portion of the upper edge that protrudes most toward the lower edge in the width direction of the upper edge. up display. further comprising a holder that accommodates the display panel together with the hot mirror and the packing and has a holder-side opening that exposes the hot mirror ;
4. A head-up display according to claim 3, wherein said holder-side opening has substantially the same shape as said peripheral portion. The head-up display according to any one of claims 1 to 5, wherein the peripheral portion has substantially the same shape as the display area of the display panel.

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