JP7189507B2 - Display member and display device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a display member that projects and displays an image while having light transmittance, and a display device using the display member.

2. Description of the Related Art Display devices such as a head-up display (hereinafter referred to as HUD: Head-Up Display) device are required to widen the FOV (viewing angle, that is, the size of the virtual image) of a virtual image. If the FOV of the virtual image is widened while maintaining the eyebox size, the optical members become large, and as a result, the size of the head-up display device may also become large. There is a method using a Fresnel element for miniaturization of the head-up display device. For example, there is a head-up display device that includes a light source that forms a display image and a half mirror with a Fresnel structure that allows light from the light source to enter from above (see Patent Document 1, for example).

In order to make a Fresnel sheet, the adhesive layer used to bond Fresnel elements and optical elements that make up a half mirror with a Fresnel structure to other members has surface damage caused by various disturbances (physical impact and thermal impact). To eliminate distortion, adhesives that remain flexible even after hardening are often used. In this case, when the outer shape of the Fresnel sheet is post-processed, the soft adhesive used for the adhesive layer adheres to the tool, which increases the number of processing steps such as cleaning and lowers the processing accuracy. In addition, the adhesive protrudes outside the sheet during processing, causing poor appearance. In particular, in the case of an optical element (Fresnel sheet) having a Fresnel structure in which a Fresnel element and a flat sheet member are bonded together using an adhesive, the above-described problems become significant.

WO2014/041689

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display member that can prevent deterioration of workability and poor appearance when the external shape is post-processed.

Another object of the present invention is to provide a display device incorporating the display member described above.

A display member for solving the above problems comprises a first optical element having a first Fresnel shape portion on one surface, a second optical element having a second Fresnel shape portion on one surface, and a second optical element. a third optical element disposed on the other surface, the second Fresnel shape portion having a shape substantially inverted from the shape of the first Fresnel shape portion, and the first Fresnel shape portion and the second Fresnel shape portion constitutes a Fresnel structure portion facing each other, the second optical element includes a soft adhesive layer that bonds the first optical element and the third optical element, and the third optical element is a sheet-like member and the soft adhesive layer is not exposed to the portion to be cut of at least one of the first and third optical elements. The substantially inverted shape also means that the shape of the second Fresnel shaped portion is not exactly the same as the inverted shape of the first Fresnel shaped portion, and may include some errors. Further, the portions to be cut of the first and third optical elements are the targets of the post-processing of the outer shape of the display member, and are the surfaces of the display member to be cut. The display member is not limited to the one before post-processing, and includes the one after post-processing.

According to the above-described display member, the outer shape of the display member is post-processed by adopting a configuration in which the soft adhesive layer constituting the second optical element is not exposed to the planned cutting portion of the first or third optical element. At that time, part of the adhesive layer adheres to tools, etc., increasing the number of processes such as cleaning, lowering the processing accuracy, and preventing the adhesive layer from protruding during processing and resulting in poor appearance. be able to. Further, the second optical element composed of a soft adhesive layer can prevent surface distortion of the display member due to disturbance such as physical impact or thermal impact.

According to a specific aspect of the present invention, in the display member, the outer edge adhesive layer of the second optical element corresponding to the portion to be cut is surrounded by a part of the first optical element. In this case, exposure of the soft adhesive layer can be directly prevented.

According to another aspect of the present invention, the outer edge adhesive layer corresponding to the portion to be cut of the second optical element is surrounded by a part of the third optical element. In this case, exposure of the soft adhesive layer can be directly prevented.

According to still another aspect of the present invention, the hardness of the outer edge adhesive layer corresponding to the portion to be cut of the second optical element is higher than the hardness of the inner side of the adhesive layer. In this case, exposure of the soft adhesive layer can be directly prevented.

According to still another aspect of the present invention, the second optical element is not provided with a soft adhesive layer at a position corresponding to the portion to be cut. In this case, it is possible to indirectly prevent the soft adhesive layer from being exposed.

In still another aspect of the present invention, the hardness of the second optical element is softer than the hardness of the first and third optical elements. In this case, it is possible to further prevent surface distortion of the display member due to disturbances such as physical impact and thermal impact.

In yet another aspect of the invention, the first, second and third optical elements have approximately the same refractive index. Here, "substantially the same refractive index" means having a refractive index difference of about 0 to 0.05. In this case, distortion of transmitted light passing through the display member can be prevented.

In order to solve the above-described problems, a display device according to the present invention includes the display member described above, a display screen provided with the display member at least in part, and a drawing unit for displaying an image corresponding to a virtual image displayed through the display member. and

According to the above-described display device, even if the above-described display member is subjected to post-processing of the outer shape, it does not cause deterioration of workability or appearance defects, and surface distortion due to disturbance such as physical impact or thermal impact is less likely to occur. As a result, a good virtual image can be displayed through the display member.

FIGS. 1A and 1B are diagrams illustrating a display member according to a first embodiment and a display device incorporating the display member. FIG. 1B is a side cross-sectional view illustrating the configuration of the display member and the display device shown in FIG. (A) is a plan view of the display member in FIG. 2 as seen from the first optical element side, (B) is an AA' cross-sectional view of the display member in (A), and (C) is It is a figure explaining the modification of the display member of (A). (A) and (B) are conceptual diagrams explaining the periphery of the outer edge of the display member, (C) is a conceptual diagram explaining a cut surface after post-processing of the display member, and (D) is a It is a figure explaining the modification of the display member of (A). (A) is a conceptual diagram explaining the periphery of an outer edge portion of a display member according to a second embodiment, and (B) is a diagram explaining a modification of the display member in (A). (A) and (B) are conceptual diagrams explaining the periphery of an outer edge portion of a display member according to a third embodiment. (A) is a conceptual diagram explaining the periphery of an outer edge portion of a display member according to a fourth embodiment, and (B) and (C) are diagrams explaining modifications of the display member in (A). 8A and 8B are a plan view and a partially enlarged cross-sectional view for explaining a fixing method of the display member in FIG. 7; FIG.

[First embodiment]
Hereinafter, display members and display devices according to embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1(A), 1(B), and 2, the display member 100 of the present embodiment is a light-transmitting plate member such as a windshield 8 or a windshield of a vehicle such as an automobile. is attached via an adhesive or pressure-sensitive adhesive layer or the like. In this embodiment, the display unit 130 using part of the windshield 8 functions as the display screen 20 , and the display member 100 forms part of the display screen 20 .

The display member 100 is a flexible thin sheet member. The display member 100 has an internal transmittance of, for example, 80% or more in the visible light wavelength range. The display member 100 clearly projects a projected image (display light) from the drawing unit 10 of the display device 200, which will be described later, and transmits light from the outside world. That is, when the display member 100 is used for the display device 200 such as the HUD device, an observer (driver UN) or the like observes the external background through the display member 100, specifically the display unit 130, and the projected image is displayed. can also be observed.

As shown in FIGS. 3A and 3B, the display member 100 is a Fresnel element (Fresnel mirror) 60 . The Fresnel element 60 has a Fresnel structure portion 61 in which arc-shaped jagged projections or ridges with a sawtooth cross section are repeatedly formed in one direction at a predetermined pitch. Specifically, the illustrated Fresnel structure 61 has an off-axis or eccentric pattern. The illustrated Fresnel structure portion 61 is arranged so that the normal lines of the individual arcs forming the ring zone as a whole are directed downward. The Fresnel structure portion 61 has an arcuate optical surface 61a and a flat stepped surface 61b. The optical surface 61a contributes to reflection, and the stepped surface 61b does not contribute to reflection. An antireflection treatment can be applied to the step surface 61b. The optical surface 61a is formed based on a concave free-form curved surface that serves as a reference. That is, the height of the free-form surface from the optical origin is referred to and divided into a plurality of belt-like regions, which are distributed to a plurality of optical surfaces 61a. By using a free-form surface as the reference shape of the optical surface 61a, a high-magnification optical system becomes possible, and a virtual image can be enlarged. The pitch of the Fresnel structure portion 61 can be changed, for example, depending on the location, but it can also be constant regardless of the location. Moreover, the height of the Fresnel structure portion 61 (the length of the step surface 61b in the thickness direction of the display member 100) is preferably 100 μm or less.

As shown in FIG. 3B, the display member 100 has a structure in which a first optical element 111, a second optical element 112, and a third optical element 113 are joined together. The first optical element 111 of the display member 100 is arranged on the side of the driver UN who is an observer, and has a first Fresnel-shaped portion 111a on one surface. The second optical element 112 is arranged on the opposite side of the driver UN to face the first optical element 111, and has a second Fresnel-shaped portion 112a on one surface. The first Fresnel-shaped portion 111a and the second Fresnel-shaped portion 112a constitute a Fresnel structure portion 61 facing each other. The second Fresnel shape portion 112a has a shape substantially inverted from the shape of the first Fresnel shape portion 111a. Note that the substantially inverted shape means that the shape of the second Fresnel shaped portion 112a is not exactly the same as the inverted shape of the first Fresnel shaped portion 111a, and may include some errors. do. In the first and second optical elements 111 and 112, the surfaces opposite to the bonding surface SR of the first and second optical elements 111 and 112 are flat surfaces 111b and 112b, respectively.

Note that the pattern of the Fresnel structure portion 61 can be appropriately changed according to the specifications. For example, as shown in FIG. 3(C), the Fresnel structure portion 61 may be arranged such that the normal lines of the individual arcs forming the ring zone as a whole are oriented in the upper left direction. Also, PET sheets may be provided on both sides of the first and third optical elements 111 and 113 .

The first optical element 111 is a Fresnel optical element made of resin or glass, and is manufactured by press molding, transfer molding using a photocurable resin, or the like. For example, acryl, polycarbonate, PET, or the like is used as the resin material.

The second optical element 112 is a soft adhesive layer 112c that bonds the first optical element 111 and the third optical element 113 together. When the first optical element 111 and the third optical element 113 are joined together, the second optical element 112 follows the first optical element 111 to form the second Fresnel-shaped portion 112a. As a material for the adhesive layer 112c, for example, an acrylic UV curable resin, an epoxy UV curable resin, or the like is used. The soft adhesive layer 112c has hardness to such an extent that the display member 100 is not deformed when the outer shape of the display member 100 is post-processed. Specifically, the hardness of the soft adhesive layer 112c is about 50, for example. The soft adhesive layer 112c may adhere to a tool or protrude from the display member 100 during post-processing. Therefore, in the second optical element 112, as shown in FIG. It is configured so that it is not exposed. Although illustration is omitted from FIG. 4(C) onward, actually, a Fresnel structure as shown in FIG. 4(A) is provided between the first optical element 111 and the second optical element 112. A portion 61 and the like are provided (however, the portions with which the first and third optical elements 111 and 113 abut are excluded).

As shown in FIG. 4A, the adhesive layer 112c is not exposed to the post-processing portion HR of at least one of the first and third optical elements 111 and 113. As shown in FIG. Further, as shown in FIGS. 4A to 4C, the adhesive layer 112c is exposed to the cut portion CR or cut surface DR of at least one of the first and third optical elements 111 and 113. not. Here, the post-processing portion HR is a target portion for post-processing the outer shape of the display member 100 . Further, the portion to be cut CR is a target for post-processing the outer shape of the display member 100, and is a surface of the display member 100 to be cut. In addition, the display member 100 is not limited to the one before post-processing, and includes the one after post-processing. Regarding the adhesive layer 112c, the second optical element 112 has an outer edge adhesive layer 112d at a position closest to the portion to be cut CR. As shown in FIG. 4A and the like, in this embodiment, the outer edge adhesive layer 112d (soft adhesive layer 112c in this embodiment) corresponding to the portion to be cut CR is part of the first optical element 111. surrounded by In this case, it is possible to directly prevent the soft adhesive layer 112c from being exposed. Specifically, a convex portion 111 c is provided on the outer edge of the first optical element 111 , and the contact between the convex portion 111 c and one surface 113 a of the third optical element 113 causes the second optical element 112 to The outer edge adhesive layer 112d is not exposed. The width of the convex portion 111c of the first optical element 111 is greater than or equal to the range of the post-processing portion HR. As a result, as shown in FIG. 4(C), even if the display member 100 is cut at the cutting portion CR in the post-processing portion HR during the post-processing, the second optical element 112 is formed on the cut surface DR. The outer edge adhesive layer 112d is not exposed. On the other hand, the outer edge portions of the first and third optical elements 111 and 113 are exposed on the cut surface DR. The width of the convex portion 111c after post-processing is, for example, about 1 mm to 2 mm.

In this embodiment, as shown in FIG. 4D, the convex portion 111c provided on the outer edge of the first optical element 111 may be configured to bite into the third optical element 113 side or cover it from the surroundings. good. In the display member 100 shown in FIG. 4D, the outer edge portion of the first optical element 111 is exposed at the cut surface DR.

As shown in FIG. 3B and the like, the third optical element 113 is a sheet-like member made of resin or glass, and has one surface 113a on the side of the second optical element 112 and the other surface on the opposite side. The surface 113b of is a flat surface. As the resin material, for example, epoxy UV curable resin, acryl, polycarbonate, PET, or the like is used.

The first, second and third optical elements 111, 112, 113 have approximately the same refractive index. Here, "substantially the same refractive index" means having a refractive index difference of about 0 to 0.05. In this case, it is possible to prevent problems such as refraction from occurring at the joint surfaces of the optical elements 111, 112, and 113, thereby preventing deterioration such as distortion of transmitted light passing through the display member 100 and, in turn, image distortion. be able to. As for the refractive indices of the first and second optical elements 111 and 112, it is desirable to use the refractive index of the substrate having the first Fresnel-shaped portion 111a on the side where the display light HK is reflected as a reference.

The hardness of the second optical element 112 is softer than those of the first and third optical elements 111 and 113 . Since the second optical element 112 is a soft adhesive layer 112c, even when the first and third optical elements 111 and 113 have different expansion ratios, the adhesive interface between them is less likely to peel off when the temperature changes. As a result, surface distortion of the display member 100 due to disturbances such as physical impacts and thermal impacts can be further prevented.

In the following, the state of use of the display member 100 and the like will be described. As shown in FIGS. 1A, 1B, 2, etc., the display member 100 is incorporated into a display device 200. FIG. This display device 200 is mounted in the vehicle body 2 as a head-up display device, for example, and includes a drawing unit 10 and a display member 100 . The display device 200 performs virtual image display or virtual image projection through the display member 100 of image information displayed on a display element 30 to be described later. In this embodiment, the display member 100 is installed integrally with the windshield (front window) 8 .

The drawing unit 10 of the display device 200 is installed so as to be embedded in the dashboard 4 of the vehicle body 2, and the display unit 130 of the display member 100 emits display light HK corresponding to an image including driving-related information, danger signals, and the like. shoot toward. The display unit 130 has a first optical surface 11a provided on the observation side where the driver UN is present or the driver's seat 6 side, and a second optical surface 12a provided on the non-observation side. The reflectance of the display section 130 is higher than the reflectance of the area around the display section 130 . In this case, the image can be made easier to see on the display unit 130 than on the surroundings of the display unit 130 . The area of the display unit 130 and its surrounding area are determined by the viewing angle of the observer (driver UN) and the specifications of the eyebox. The display unit 130 reflects the display light HK from the drawing unit 10 toward the rear of the vehicle body 2 . The display light HK reflected by the display member 100 (display unit 130) is guided to an eye box corresponding to the pupil HT of the driver UN and its peripheral position. The driver UN can observe the display light HK reflected by the display member 100 , that is, the display image IM as a virtual image in front of the vehicle body 2 . On the other hand, the driver UN can observe external light transmitted through the display member 100, that is, a real image such as a front view. As a result, the driver UN displays a display image (virtual image) including driving-related information and the like formed by reflection of the display light HK on the display unit 130 of the display member 100, superimposed on the image of the outside world behind the display unit 130. IM can be observed.

As shown in FIG. 2 , the drawing unit 10 includes a drawing device 40 having a display element 30 , an enlarged projection optical system 50 and a housing 14 . Note that FIG. 2 illustrates the configuration of the display device 200, and the configuration of the display device 200 may be changed as appropriate depending on the specifications, installation location, and the like.

Although detailed description is omitted, the drawing device 40 includes, in addition to the display element 30, a display drive circuit that causes the display element 30 to perform a display operation, an LED or other light source that emits light for illuminating the display element 30, A homogenization optical system or the like is provided to homogenize the light from the light source. The display element 30 may be a reflective element such as a digital mirror device (DMD) or a reflective liquid crystal element (LCOS), or a transmissive element such as a liquid crystal (for example, a liquid crystal display (LCD)). In particular, using a DMD as the display element 30 is advantageous for display because images can be switched at high speed while maintaining brightness.

The magnifying projection optical system 50 includes a first projection optical system 51 that forms an intermediate image corresponding to the image formed on the display element 30 and a display image ( and a second projection optical system 52 for displaying a virtual image (IM). The magnifying projection optical system 50 has an intermediate screen 16 at or near the position where the intermediate image is formed. Although detailed description is omitted, the intermediate screen 16 can be a movable member that moves in the optical axis direction. In this case, the magnifying projection optical system 50 has a variable focus, and can change the projection distance of the display image (virtual image) IM.

The housing 14 has an opening 14a through which the display light HK passes, and a film-like or thin plate-like light transmitting member 14b can be arranged in this opening 14a.

As shown in FIG. 1A, the display light HK reflected by the display member 100 is guided to the eyes HT of the driver UN. Here, the virtual image ray KK obtained by extending the display light HK to the rear of the display member 100 forms a display image (virtual image) IM at a predetermined position in front of the pupil HT of the driver UN. The distance from the pupil HT to the display member 100 is, for example, about 0.5 to 1 m, depending on the specifications of the vehicle body 2, and the distance from the display member 100 to the display image IM is, for example, about 1 m or more. Also, the viewing angle is about -10° to -15°. Also, the eyebox is set to cover the standard position of the eyes HT of the driver UN, and is set to a size of, for example, 10 to 15 cm in width and 5 to 8 cm in height.

In the display member 100 described above, the soft adhesive layer 112c constituting the second optical element 112 is configured so as not to be exposed to the cut portions of the first or third optical elements 111, 113. part of the adhesive layer 112c adheres to a tool or the like, resulting in an increase in the number of processes such as cleaning, a decrease in machining accuracy, or a protrusion of the adhesive layer 112c during machining. Defective appearance can be prevented. Further, the second optical element 112 composed of the soft adhesive layer 112c can prevent surface distortion of the display member 100 due to disturbance such as physical impact or thermal impact.

[Second embodiment]
A display member and the like according to the second embodiment will be described below. Note that the display member and the like of the second embodiment are obtained by modifying the display member and the like of the first embodiment, and items not particularly described are the same as those of the first embodiment.

In this embodiment, as shown in FIG. 5A, the outer edge adhesive layer 112d (in this embodiment, a soft adhesive layer 112c) corresponding to the portion to be cut CR of the display member 100 is the third optical element 113. partly surrounded. In this case, it is possible to directly prevent the soft adhesive layer 112c from being exposed. Specifically, a convex portion 113c is provided on the outer edge of the third optical element 113, and the convex portion 113c and the surface 111e of the first optical element 111 on which the first Fresnel-shaped portion 111a is provided are in contact with each other. Thus, the outer edge adhesive layer 112d of the second optical element 112 is not exposed. The width of the convex portion 113c of the third optical element 113 is greater than or equal to the range of the post-processing portion HR. Accordingly, even if the display member 100 is cut at the cutting portion CR in the post-processing portion HR during post-processing, the outer edge adhesive layer 112d of the second optical element 112 is not exposed on the cut surface. On the other hand, the outer edge portions of the first and third optical elements 111 and 113 are exposed on the cut surface DR.

In this embodiment, as shown in FIG. 5B, the convex portion 113c provided on the outer edge portion of the third optical element 113 may be configured to bite into the first optical element 111 side or cover it from the surroundings. good. In the display member 100 shown in FIG. 5B, the outer edge portion of the third optical element 113 is exposed at the cut surface DR.

[Third Embodiment]
A display member and the like according to the third embodiment will be described below. Note that the display member and the like of the third embodiment are obtained by modifying the display member and the like of the first embodiment, and items that are not particularly described are the same as those of the first embodiment.

In this embodiment, as shown in FIGS. 6A and 6B, the hardness of the outer edge adhesive layer 112d corresponding to the portion to be cut CR of the second optical element 112 is higher than the hardness of the inner side of the adhesive layer 112c. is also stiff. As a result, the hard adhesive layer 112e having a relatively high hardness among the outer peripheral adhesive layers 112d is arranged at the end portion of the post-processing portion HR of the first and third optical elements 111 and 113, and the inner adhesive layer 112c The soft adhesive layer 112c having a small hardness is not exposed to the post-processing portion HR. The hard adhesive layer 112e, which has a relatively high hardness, makes it difficult for the adhesive or the like to adhere to the tool even when post-processing is performed. , 113 are not exposed to the planned cutting portions CR. On the other hand, the outer edge portions of the first optical element 111, the hard adhesive layer 112e, and the third optical element 113 are exposed at the cut surface DR. This can directly prevent the soft adhesive layer 112c from being exposed. The hard adhesive layer 112e is formed by increasing the hardness of the same material as the inner adhesive layer 112c by lengthening the UV irradiation time or using a curing agent. If the hard adhesive layer 112e has a cutting hardness of, for example, about 70 when the outer shape of the display member 100 is cut, deformation of the outer edge adhesive layer 112d can be prevented.

[Fourth Embodiment]
A display member and the like according to the fourth embodiment will be described below. Note that the display member and the like of the fourth embodiment are obtained by modifying the display member and the like of the first embodiment, and items not particularly described are the same as those of the first embodiment.

In this embodiment, as shown in FIG. 7A, in the second optical element 112, the soft adhesive layer 112c is not provided at the position corresponding to the portion to be cut CR, and the space 114 is provided. there is Therefore, the soft adhesive layer 112c is not exposed to the post-processed portions HR of the first and third optical elements 111 and 113. As shown in FIG. Also, as a result, the soft adhesive layer 112c is not exposed to the cutting target portions CR of the first and third optical elements 111 and 113 . On the other hand, the outer edge portions of the first and third optical elements 111 and 113 are exposed on the cut surface DR. This can indirectly prevent the soft adhesive layer 112c from being exposed. In the example of FIG. 7A, the outlines of the first and third optical elements 111 and 113 are larger than the outline of the second optical element 112, and the outer edges of the first and third optical elements 111 and 113 are 2 It is configured to project beyond the outer edge of the adhesive layer 112 c of the optical element 112 .

In this embodiment, as shown in FIG. 7B, the outer shape of the first optical element 111 is made larger than the outer shapes of the second and third optical elements 112 and 113, and the outer edge of the first optical element 111 A portion may protrude beyond the adhesive layer 112 c of the second optical element 112 and the outer edge of the third optical element 113 . In this case, the outer edge of the first optical element 111 is exposed on the cut surface DR. Further, as shown in FIG. 7C, the external shape of the third optical element 113 is made larger than the external shapes of the first and second optical elements 111 and 112, and the outer edge of the third optical element 113 The adhesive layer 112 c of the optical element 112 and the outer edge of the first optical element 111 may be protruded. In this case, the outer edge of the third optical element 113 is exposed on the cut surface DR.

Also, in FIG. 1A and the like, the display member 100 is attached to the windshield 8 using an adhesive or the like. may be arranged alone independently of the windshield 8 using a fixture 70. In the illustrated example, the display member 100 shown in FIG. 7B is fixed using a fixture 70 . Specifically, both sides of the outer edge of the display member 100 are sandwiched between the first fixing member 70a and the second fixing member 70b of the fixture 70, and fixed with the bolt 70c from the second fixing member 70b side. The fixture 70 is configured to be attachable to the drawing unit 10 or the dashboard 4 , and the display member 100 is fixed to the drawing unit 10 or the dashboard 4 via the fixture 70 . Note that, as in the display member 100 shown in FIGS. 7B and 7C, when one of the first and third optical elements 111 and 113 protrudes from the other optical element, all The load applied to the display member 100 can be reduced as compared with the case where the optical element is sandwiched between the fixtures 70, and the display member 100 can be further prevented from being distorted.

The configuration of this embodiment can also be combined with the configuration of the third embodiment. That is, in the adhesive layer 112c of the second optical element 112, the outer edge adhesive layer 112d may be the hard adhesive layer 112e.

[deformation and others]
Although the display member and the like according to the embodiments have been described above, the display member and the like according to the present invention are not limited to the above.

For example, in the above embodiment, the display device 200 can be turned upside down and the display unit 130 or the display member 100 can be arranged above the windshield (front window) 8 or at the sun visor position. In this case, the display section 130 or the display member 100 is arranged obliquely downward and forward of the drawing unit 10 . Also, the display 130 or the display member 100 may be placed in a position corresponding to a conventional mirror of the automobile.

Further, in the above embodiment, the display member 100 may be arranged independently of the windshield 8 or may be attached to a combiner or the like that is a member independent of the windshield 8 .

In addition, in the above-described embodiments, the outline of the display unit 130 or the display member 100 is not limited to a rectangle, and can be of various shapes.

Moreover, in the above-described embodiment, the magnifying projection optical system 50 is merely an example, and the optical configuration thereof can be changed as appropriate. For example, an intermediate image can be additionally formed in the first projection optical system 51 as a preceding stage of the intermediate image. One or more mirrors having no optical power may be arranged in the optical path of the second projection optical system 52 . Alternatively, the intermediate screen 16 may not be provided.

Further, in the above embodiment, the post-processing of the display member 100 may be cutting out the outer shape of a single display member 100 or cutting out a plurality of display members 100 . In the case of cutting out a plurality of display members 100, the soft adhesive layer 112c is arranged at a position other than the periphery of the post-processing portion HR or the portion to be cut CR.

The display device 200 described above is not limited to a projection device mounted on an automobile or other moving body, and can be incorporated into a digital signage or the like, but can also be applied to uses other than these.

2 Vehicle body 8 Windshield 10 Drawing unit 20 Display screen 60 Fresnel element 61 Fresnel structure 60 Fixing tool 100 Display member 111, 112, 113 Optical element 111a , 112a... Fresnel shape portion 112c... Adhesive layer 112d... Outer edge adhesive layer 112e... Hard adhesive layer 130... Display part 200... Display device CR... Part to be cut DR... Cut surface HK... Display light, HR...Post-processing part IM...Display image UN...Driver

Claims (4)

a first optical element having a first Fresnel-shaped portion on one surface;
a second optical element having a second Fresnel-shaped portion on one surface;
a third optical element arranged on the other surface of the second optical element;
with
The second Fresnel shape portion has a shape substantially inverted from the shape of the first Fresnel shape portion,
The first Fresnel shape portion and the second Fresnel shape portion are opposed to each other to constitute a Fresnel structure portion,
the second optical element includes a soft adhesive layer that bonds the first optical element and the third optical element;
The third optical element is a sheet-like member,
wherein the soft adhesive layer is not exposed to the portion to be cut of at least one of the first and third optical elements,
The display member , wherein hardness of the outer edge adhesive layer positioned in the portion to be cut of the second optical element is higher than hardness of the soft adhesive layer positioned inside . 2. The display member according to claim 1 , wherein hardness of said second optical element is softer than hardness of said first and third optical elements. 2. The display member according to claim 1, wherein said peripheral adhesive layer is exposed by being cut at said portion to be cut. The display member according to any one of claims 1 to 3 ;
a display screen at least partially provided with the display member;
a drawing unit that displays an image corresponding to the virtual image displayed through the display member;
A display device comprising:

Images