Image display device

Abstract

To provide an image display device capable of reducing astigmatism.SOLUTION: A smart glass 100 comprises: a display 104 outputting video light; a transmission hologram 102b corresponding to a change optical member changing the direction of travel of the video light; a lens group (lens 102c1, lens 102c2) corresponding to an image forming optical member imaging the transmitted video light; and a reflection hologram 102a corresponding to a reflection optical member changing an angle of the imaged video light and reflecting it to an image forming surface. The reflection hologram 102a, the transmission hologram 102b and the lens group are disposed on a position based on the principle of Scheimpflug. Specifically, a direction change surface (transmission surface) of the transmission hologram 102b, a reflection surface of the reflection hologram 102a and a lens surface (center point P1 of the lens group) of the image forming optical member are disposed on a position based on the principle of Scheimpflug.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an image display device.

Background Art

[0002] Patent Document 1 describes smart glasses that display an image on a lens.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a device such as smart glasses that enlarges the light of a display to observe a virtual image, it is desirable that the visibility of all pixels of the video light incident on the eye is the same. Usually, it is designed to be all parallel light.

[0005] However, when the video light is incident obliquely on an optical system such as a hologram or a concave mirror in front of the eye, astigmatism occurs in the virtual image. That is, the video light does not become parallel light. Therefore, it is necessary to correct the video light, but the reflection optical system in front of the eyes becomes complicated. Especially in smart glasses, when the optical system arranged in front of the eyes becomes complicated, problems such as impaired wearability and a heavy and thick feeling in front of the eyes occur.

[0006] Therefore, an object of the present invention is to provide an image display device capable of reducing astigmatism.

Means for Solving the Problems

[0007] The image display device of the present invention includes a display that outputs video light, a change optical member that changes the traveling direction of the video light, an imaging optical member that forms an image of the transmitted video light, and a reflection optical member that reflects the imaged video light at an angle to an imaging surface. The direction change surface of the change optical member, the reflection surface of the reflection optical member, and the lens surface of the imaging optical member are arranged at positions based on the principle of shine proofing.

Effect of the Invention

[0008] According to the present invention, spherical aberration can be reduced.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0010] Embodiments of the present disclosure will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals and overlapping descriptions are omitted.

[0011] FIGS. 1 and 2 are diagrams showing the configuration of smart glasses 100 including a reflective hologram 102a, a transmissive hologram 102b, and a lens group 102c in the present disclosure. This smart glasses functions as an image display device.

[0012] As shown in the figure, a reflective hologram 102a is arranged on the lens 102. The display 104 is arranged under the arm 104 of the smart glasses.

[0013] These reflective holograms 102a, transmissive holograms 102b, and lens group 102c are arranged using the Scheimpflug principle so that the focus of the display is at the position of the reflective hologram 102a.

[0014] The Scheimpflug principle refers to an imaging system in which the object plane and the image plane are not parallel, and it is the principle that the intersection line between the intersection line of the object plane and the lens plane and the in-focus image plane intersects at one point. The hologram and the lens group are arranged in the same positional relationship as this principle. Specifically, when the transmissive hologram 102b and the lens group 102c are installed at an angle rather than in parallel, the extension plane of the transmissive hologram 102b, the plane passing through the middle of the two lenses of the lens group 102c and perpendicular to the optical axis, and the extension plane of the reflective hologram 102a intersect on the same line. In the present disclosure, it is necessary that the extension planes (virtual lines) of the transmissive hologram 102b, the plane (virtual line) perpendicular to the optical axis passing through the middle of the two lenses in the lens group 102c, and the extension planes (virtual lines) of the reflective hologram 102a intersect on the same line. Also, the lenses in the lens 102c are arranged in parallel.

[0015] FIG. 3 is a diagram showing the detailed positional relationship. The reflective hologram 102a, the transmissive hologram 102b, and the lens group 102c are arranged so that a virtual line S2 showing the extension plane of the reflective surface of the reflective hologram 102a, a virtual line S1 showing the extension plane of the transmissive surface of the transmissive hologram 102b, and a virtual line S3 showing the extension plane of the plane passing through the middle of the lens group 102c including the two lenses and perpendicular to the optical axis intersect at point P. In FIG. 3, the display 104 outputs image light H, and the transmissive hologram 102b diffracts and outputs image light H1.

[0016] In the present disclosure, the lens 102c1 and the lens 102c2 are arranged as lens surfaces utilized in the Scheimpflug principle.

[0017] The virtual line S3 is a line connecting point P and point P1, where P1 is the position where a perpendicular line is drawn from point P to the optical axes of the two lens groups 102c. The optical axes of the lens groups 102c are in a straight line.

[0018] Lens 102c1 is arranged at the center of the line connecting position P1 and the reflection hologram 102a. In FIG. 3, if the length between lens 102c1 and the reflection hologram 102a is f, then lens 102c1 is arranged at a position where the length between lens 102c1 and position P1 is also f.

[0019] Similarly, lens 102c2 is arranged at the center of the line connecting position P1 and the transmission hologram 102b. In FIG. 3, if the length between lens 102c2, position P1, and the transmission hologram 102b is F, then lens 102c2 is arranged at a position where the length between lens 102c2 and position P1 is also F.

[0020] By arranging the reflection hologram 102a, the transmission hologram 102b, lens 102c1, and lens 102c2 in such a positional relationship, it is possible to obtain image light with corrected aberration.

[0021] In FIG. 3, instead of the transmission hologram 102b, a reflection hologram 102a1 may be used.

[0022] FIG. 4 is a diagram showing a specific example. As shown in the figure, when the position of the display 104 is opposite to that in FIG. 3, by arranging the reflection hologram 102a1 instead of the transmission hologram 102b, it is similarly possible to correct the aberration. In FIG. 4, the reflection hologram 102a1 reflects the image light H and outputs the image light H1 to the lens group.

[0023] Next, the effects of the smart glasses 100 of the present disclosure will be described. The smart glasses 100 include a display 103 that outputs image light, a transmissive hologram 102b corresponding to a changing optical member that changes the traveling direction of the image light, a lens group 102c (lenses 102c1, 102c2) corresponding to an imaging optical member that forms an image of the transmitted image light, and a reflective hologram 102a corresponding to a reflective optical member that reflects the imaged image light at an angle to an imaging surface.

[0024] The reflective hologram 102a, the transmissive hologram 102b, and the lens group are arranged at positions based on the Shine-proof principle. Specifically, the direction-changing surface (transmission surface) of the transmissive hologram 102b, the reflection surface of the reflective hologram 102a, and the lens surface of the imaging optical member (position P1 which is the center point of the lens group) are arranged at positions based on the Shine-proof principle.

[0025] That is, the lens group, which is an imaging optical member, is arranged at a position based on a second intersection point (position P1) with a perpendicular line dropped from a first intersection point (point P) between a virtual line extending the transmissive hologram 102b and a virtual line extending the reflection surface of the reflective hologram 102a to a virtual line connecting the transmissive hologram 102b and the reflective hologram 102a.

[0026] Thereby, it is possible to provide the smart glasses 100 with reduced spherical aberration.

[0027] Since the smart glasses 100 are small, the lens group is composed of several lenses 102c. In the present disclosure, the lens group, which is an imaging optical member, is composed of two lenses 102c1, 102c. One lens 102c2 is arranged in the middle between the direction-changing surface of the transmissive hologram 102b and the second intersection point (position P1). Also, the other lens 102c1 is arranged in the middle between the second intersection point (position P1) and the reflection surface of the reflective hologram 102a.

[0028] Thereby, it enables an optical arrangement applying the Shine-proof principle to the small smart glasses 100.

[0029] As described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning for the present disclosure.

[0030] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in the present disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0031] As used in the present disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0032] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0033] In this disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in this disclosure is not intended to be an exclusive disjunction.

[0034] In this disclosure, for example, when articles are added by translation, such as a, an and the in English, this disclosure may include that the nouns following these articles are in the plural form.

[0035] In this disclosure, the term "A is different from B" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled" etc. may also be interpreted in the same way as "different".

Description of Reference Signs

[0036] 102a... reflective hologram, 102b... transmissive hologram, 102c... lens group, 100... smart glasses, 102... lens, 103... strap, 104... display.

Claims

1. A display that outputs image light, An optical member for changing the traveling direction of the image light, An imaging optical member that forms an image of the image light whose traveling direction has been changed, A reflective optical member that reflects the imaged image light at an angle to an imaging surface, Comprising: An image display device, wherein the direction-changing surface of the optical member for changing, the reflecting surface of the reflective optical member, and the lens surface of the imaging optical member are arranged at positions based on the principle of shine-proof.

2. The imaging optical member is Arranged at a position based on a second intersection point between a perpendicular line dropped from a first intersection point between an imaginary line extending the direction-changing surface and an imaginary line extending the reflecting surface to an imaginary line connecting the optical member for changing and the reflective optical member from the optical member for changing. The image display device according to Claim 1.

3. The imaging optical member consists of two lenses, One lens is arranged in the middle between the direction-changing surface of the optical member for changing and the second intersection point, The other lens is arranged in the middle between the second intersection point and the reflecting surface of the reflective optical member. The image display device according to Claim 2.

4. The optical member for changing is a transmission hologram that diffracts the image light from the display to the imaging optical member. The image display device according to Claim 1.

5. The optical member for changing is a reflection hologram that reflects the image light from the display to the imaging optical member. The image display device according to Claim 1.

Images