JP2017026944A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-see display device.SOLUTION: There is provided with a display device including an optical section, a reflection section and a holding section. The optical section emits image light including image information. The reflection section reflects at least a part of the image light. The holding section detachably holds a first optical member. The first optical member is provided between the optical section and the reflection section on an optical path of the image light. A principal ray of the image light is made incident in a first direction to the first optical member, and is emitted in a second direction different from the first direction from the first optical member.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a display device.

  A display device such as a head mounted display (HMD) that can be mounted on the user's head has been proposed. This display device includes, for example, an optical unit that emits image light including image information and a reflection unit (combiner) that reflects image light. The image light is reflected toward the user's eyes at the reflection portion. As a result, an image is displayed to the user. In such a display device, it is desired to adjust the position where the image is displayed to obtain an easy-to-see display.

JP-A-10-111470

  Embodiments of the present invention provide an easy-to-see display device.

  According to the embodiment of the present invention, a display device including an optical unit, a reflecting unit, and a holding unit is provided. The optical unit emits image light including image information. The reflection part reflects at least a part of the image light. The said holding | maintenance part hold | maintains a 1st optical member so that attachment or detachment is possible. The first optical member is provided between the optical unit and the reflection unit on the optical path of the image light. The principal ray of the image light is incident on the first optical member along a first direction and is emitted from the first optical member along a second direction different from the first direction.

FIG. 1A and FIG. 1B are schematic plan views showing the display device according to the first embodiment. FIG. 2A to FIG. 2C are schematic views showing the display device according to the first embodiment. FIG. 3A and FIG. 3B are schematic views illustrating the holding unit of the display device according to the first embodiment. FIG. 4A to FIG. 4C are schematic views showing the display device according to the first embodiment. FIG. 5A and FIG. 5B are schematic views showing the optical member according to the first embodiment. It is a schematic plan view which shows the optical member used for the display apparatus which concerns on 1st Embodiment. It is a schematic plan view which shows the optical member used for the display apparatus which concerns on 1st Embodiment. 1 is a schematic plan view showing a display device according to a first embodiment. It is a typical top view which shows the display apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the display apparatus which concerns on 2nd Embodiment. FIG. 11A to FIG. 11D are schematic diagrams illustrating the operation of the display device. It is a block diagram which shows the image correction part of the display apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows the display apparatus which concerns on embodiment.

Each embodiment will be described below with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between the parts, and the like are not necessarily the same as actual ones. Further, even when the same part is represented, the dimensions and ratios may be represented differently depending on the drawings.
Note that, in the present specification and each drawing, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

(First embodiment)
FIG. 1A and FIG. 1B are schematic plan views illustrating the display device according to the first embodiment.
FIG. 1B illustrates how the user 60 uses the display device 100. FIG. 1B is a schematic plan view seen from above the user 60, and FIG. 1A shows an enlarged portion of the display device 100 in FIG. 1B.

  As shown in FIG. 1A, the display device 100 according to this embodiment includes an optical unit 10, a reflection unit 30 (combiner), a holding unit 40 (first holding unit), and a holding unit 50 (first). 2 holding units) and a circuit unit 110 (processing unit).

  The display device 100 is, for example, a monocular head mounted display (HMD). The optical unit 10 acquires image information from the circuit unit 110. The optical unit 10 emits light (image light 200) including image information according to the acquired image information. The image light 200 enters the reflection unit 30 via the first optical member 20 (optical path deflecting unit). At least a part of the image light 200 incident on the reflection unit 30 is reflected toward the pupil 150 of the user 60. Thereby, the user can observe a virtual image corresponding to the image information.

  The optical unit 10 is, for example, an image projection unit that projects the image light 200. The optical unit 10 is attached to the holding unit 40. The optical unit 10 includes a display unit 11 and an optical element 12. The display unit 11 includes a plurality of pixels 11e arranged on a plane. The display unit 11 is, for example, a display that displays video. For the display, for example, liquid crystal, organic EL, or Liquid Crystal On Silicon is used. However, the embodiment is not limited to these. The optical element 12 is, for example, a lens. The optical unit 10 may include a plurality of optical elements. A lens, a prism, a mirror, or the like can be used for each optical element.

  The optical unit 10 (display unit 11) is electrically connected to the circuit unit 110 by a bendable cable 111. Image information is input from the circuit unit 110 to the optical unit 10. The plurality of pixels 11 e of the display unit 11 emit light including the input image information, and the light passes through the optical element 12. In this way, the optical unit 10 emits the image light 200 including the input image information.

  The holding | maintenance part 50 hold | maintains the 1st optical member 20 so that attachment or detachment is possible. The holding unit 50 includes a housing unit 51, and the housing unit 51 has an opening 52. The removable holding may be in any form such as a structure using a screw or a structure using a snap fit (see FIG. 3A).

  The first optical member 20 is disposed in the housing 51 through the opening 52. Thereby, the first optical member 20 is disposed between the optical unit 10 and the reflecting unit 30 on the optical path of the image light 200 emitted from the optical unit 10.

  As the material of the first optical member 20, for example, glass or acrylic can be used. The first optical member 20 is, for example, a prism or an eccentric lens. The first optical member 20 is, for example, an optical path deflecting element that deflects the optical path of the image light 200 emitted from the optical unit 10. The holding unit 50 may hold a plurality of optical path deflecting elements (optical members) such as an eccentric lens group.

  FIG. 1A shows the image light 220 and the image light 210. The image light 220 is image light when the image light 200 is deflected by the optical path deflecting element (the first optical member 20 or the like) held by the holding unit 50. The image light 210 is image light when the image light 200 is not deflected by the optical path deflecting element held by the holding unit 50, that is, image light when the optical path deflecting element is not attached to the holding unit 50.

  A light beam (image light 200) emitted from the optical unit 10 includes a principal ray 201. Here, the principal ray 201 is the central ray of the light beam emitted from the optical unit 10, and passes through the optical axis of the optical unit 10, for example.

  The first optical member 20 changes the traveling direction of the principal ray 201 from the direction D1 to the direction D2. As a result, deflected image light 220 is generated. In other words, the principal ray 201 is incident on the first optical member 20 along the first direction (direction D1), and is emitted from the first optical member 20 along the second direction (direction D2) different from the first direction. Is done.

  An angle between the deflected image light 220 and the image light 210 (an angle between the direction D1 and the direction D2) is determined by a deflection angle of the first optical member 20. A plurality of optical path deflecting elements can be prepared as elements that are held by the holding unit 50 like the first optical member 20. For example, the deflection angles for each optical path deflecting element are different from each other. In the display device 100 according to the embodiment, the optical path deflection element can be replaced with respect to the casing unit 51. Accordingly, the user can arbitrarily define the angle (traveling direction) of the image light 220 after being deflected, for example.

  For example, the holding unit 50 can hold a second optical member different from the first optical member 20. The first optical member 20 can be removed from the installation position in the housing part 51, and instead, the second optical member can be arranged at the installation position in the housing part 51 through the opening 52. The second optical member emits the incident principal ray 201 in a direction different from the direction D2.

  The image light 220 emitted from the first optical member 20 enters the reflection unit 30. The reflection unit 30 includes a single reflection surface or a plurality of reflection surfaces. In this example, the reflection unit 30 is a multi-mirror array including a plurality of reflection surfaces 31.

  The plurality of reflecting surfaces 31 are arranged on the surface 10p (a flat surface or a curved surface). For example, the plurality of reflecting surfaces 31 are Fresnel mirrors formed by discontinuous surfaces. Each of the plurality of reflecting surfaces 31 is inclined with respect to the surface 10p, and a step is provided between the reflecting surfaces 31 adjacent to each other. The traveling direction of the reflected light can be adjusted by the angle between the reflecting surface 31 and the surface 10p. For the reflecting portion 30, a material such as glass or acrylic coated with mirror coating or half mirror coating is used.

  The reflection unit 30 is, for example, a combiner, and reflects part of the light incident on the reflection unit 30 (reflection surface 31) and transmits another part. Thereby, the user can view the outside world through the reflection unit 30. For example, the user can work while looking at the virtual image, and work efficiency can be improved.

  At least a part of the image light 220 incident on the reflection unit 30 is reflected toward the pupil 150 of the user 60. When at least part of the image light 220 enters the user's eyes, the user 60 observes the virtual image. In the present embodiment, the position of the virtual image viewed from the user can be adjusted by changing the optical path deflecting element such as the first optical member 20.

  In the present embodiment, a monocular HMD is assumed. However, the application of the display device 100 is not limited to this. For example, by using two display devices 100, the display device 100 is used as a binocular HMD.

  For example, in a monocular HMD, a virtual image is displayed in front of the eyes by using an optical path deflecting element (the first optical member 20 or the like). In a binocular HMD, in front of the eyes in consideration of the convergence angle of both eyes. Application of displaying a virtual image at a position shifted several degrees in the horizontal direction can be considered. Further, by adjusting the optical unit 10, an image can be observed from a point sufficiently away from the reflecting unit 30. Thereby, it is also possible to use the display device 100 as a head-up display (HUD).

  In an apparatus that displays an image in front of the eyes, such as a head-mounted display (HMD), the displayed image may be difficult to observe depending on the position of the user's eyes and the usage situation. Therefore, the position of the virtual image is adjusted by adjusting the positional relationship between the image light and the eyes. Thereby, an easy-to-see image can be provided.

  For example, as a method of adjusting the position of the virtual image, there is a method of moving the video display unit (the reflection unit 30 or the optical unit 10). However, providing a mechanism for moving the video display unit contributes to enlargement of the HMD.

As a method of deflecting the position of an image, there is a method of using a wedge-shaped prism in a non-transmissive HMD. However, when the prism is incorporated and fixed in the display device, the display position of the image is fixed according to the characteristics of the prism, and thus the user cannot freely adjust the position of the image.
For example, by using a vari-angle prism, the prism apex angle can be made variable, thereby adjusting the position of the image. However, since the variable range of the apex angle is narrow in the vari-angle prism, it is difficult to freely control the position of the image. In addition, the vari-angle prism is provided with a movable portion having a bellows structure and electrical wiring for controlling the operation. For this reason, an element tends to enlarge.

  In a light transmission type HMD (see-through HMD), it is desirable that a user's face and an element such as an image display unit do not contact each other. For this reason, in the light transmission type HMD, it is difficult to use an enlarged element. In the light transmission type HMD, it is desirable that the user can adjust the display position of the virtual image according to the situation and purpose. For example, when a user works while looking at a virtual image, there is a possibility that the hand is difficult to see depending on the situation.

  In contrast, in the present embodiment, the holding unit 50 holds the optical path deflecting element (the first optical member 20 or the like) so as to be detachable. For example, the user can replace the optical path deflecting element held by the holding unit 50 according to the situation. Thereby, the user can adjust the display position of the image in a wide range according to the situation. In the adjustment of the image display position, electrical control, movement of the optical unit 10, movement of the reflection unit 30, and the like may not be used. Thereby, a display apparatus can be reduced in size.

  FIG. 2A to FIG. 2C are schematic views illustrating the display device according to the first embodiment. FIG. 2A is a schematic plan view illustrating the display device 100a. In the display device 100 a, the optical member 20 a is used as the first optical member 20. Other than this, the display device 100a is the same as the display device 100 described with reference to FIG.

  FIG. 2B is a schematic plan view showing a part of FIG. FIG. 2B shows the optical member 20a and the optical unit 10 in an enlarged manner. FIG. 2C is a schematic perspective view illustrating the optical member 20a. As shown in FIG. 2C, the optical member 20a includes a portion having a cylindrical shape.

  The optical member 20a includes a first end 21a and a second end 22a. The second end 22a is aligned with the first end 21a in the third direction (direction D3). As shown in FIG. 2B, in a state where the optical member 20a is held by the holding unit 50, the length La (thickness) of the first end portion 21a along the direction D1 in which the image light is incident is , Longer (thick) than the length Lb (thickness) of the second end 22a along the direction D1.

  The optical member 20a can rotate around the rotation axis A1 while being held by the holding portion 50. The rotation axis A1 extends in a direction intersecting the direction D3. For example, the rotation axis A1 is perpendicular to the direction D3 and parallel to the direction D1 in which the image light is incident.

  The cross-sectional shape of the optical member 20a in a plane perpendicular to the rotation axis A1 is, for example, a circle. The optical member 20a has, for example, a surface 15, a surface 16, and a surface 17. The surface 15 on which the image light is incident is circular and is perpendicular to the rotation axis A1. The surface 16 from which the image light is emitted is separated from the surface 15 and is inclined with respect to the rotation axis A1. The surface 17 is a side surface parallel to the rotation axis A <b> 1 and connects the surface 15 and the surface 16.

  In the cross section perpendicular to the rotation axis A1, the rotation axis A1 is located at the center of the optical member 20a, for example. That is, the rotation axis A1 passes through the center (center of gravity) of the surface 15 and the center (center of gravity) of the surface 16.

  For example, the shape of the inner surface of the housing 51 (for example, the surface that contacts the optical member 20a and supports the optical member 20a) is a shape along the surface 17 (cylindrical shape). The cross-sectional shape of the inner surface of the housing portion 51 is, for example, a circle (a part thereof).

  As described above, the user can rotate the optical member 20 a when attaching the optical member 20 a to the housing unit 51. For example, the optical member 20a can rotate over a range of 360 degrees around the rotation axis A1. The optical member 20a can be rotated, for example, by an arbitrary angle. The optical member 20a may be rotated stepwise by a certain angle.

As a result of the rotation of the optical member 20a, the deflected image light 220 can be moved on a circle. Thereby, the user can adjust the position of the virtual image observed using the display device 100a by the rotation of the optical member 20a.
By rotating the optical member 20a as described above, the degree of freedom in adjusting the position of the virtual image in a small display device can be improved.

FIG. 3A and FIG. 3B are schematic views illustrating the holding unit of the display device according to the first embodiment. These drawings show an example of detachable holding in the holding unit 50.
FIG. 3A is a schematic plan view illustrating the holding unit 50 illustrated in FIG. FIG. 3A shows a part of the casing 51 and the first optical member 20.

  The first optical member 20 includes a main body portion 20s through which image light passes and an uneven portion 20p. The casing 51 includes an uneven portion 20q corresponding to the uneven portion 20p. The uneven portion 20p and the uneven portion 20q are, for example, nails (or frames) in snap fit. For example, a material such as a resin can be used for the uneven portion 20p and the uneven portion 20q. The uneven portion 20p is fitted into the uneven portion 20q by the elasticity of the material. The first optical member 20 is held by the casing 51 by the uneven portion 20p being caught by the uneven portion 20q. Thereby, the holding | maintenance part 50 hold | maintains the 1st optical member 20 so that attachment or detachment is possible.

  The uneven portion 20p is bonded to the main body portion 20s, for example. The uneven portion 20p includes the same material as the main body portion 20s, and may be integrally formed. You may put the 1st optical member 20 in the resin case (for example, lens barrel) which has the unevenness | corrugation similar to the uneven | corrugated | grooved part 20p. In this case, the housing part 51 holds the resin case. In addition, the shape and arrangement | positioning of the uneven | corrugated | grooved part 20p and the uneven | corrugated | grooved part 20q are not limited to said example.

FIG. 3B is a schematic plan view illustrating the holding unit 50 illustrated in FIG.
FIG. 3B corresponds to a cross section taken along line B1-B2 shown in FIG. For example, the casing 51 has elasticity by a material such as resin. The optical member 20 a is fitted into the housing 51 through the opening 52. Thereby, the holding | maintenance part 50 hold | maintains the optical member 20a so that attachment or detachment is possible. For example, the casing 51 gently grips the optical member 20 a, and the optical member 20 a can rotate within the casing 51.

  FIG. 4A to FIG. 4D are schematic views illustrating the display device according to the first embodiment. 4A and 4B are schematic plan views illustrating the display device 100b. The display device 100b includes a mechanism 300 (structure unit). Other than this, the display device 100b is the same as the display device 100a described with reference to FIGS. 4A is a schematic diagram illustrating the state S1 of the display device 100b, and FIG. 4B is a schematic diagram illustrating a state S2 different from the state S1. In addition, illustration of the holding | maintenance part 50 is abbreviate | omitted in Fig.4 (a)-FIG.4 (c).

  As shown in FIG. 4A and FIG. 4B, at least a part of the mechanism 300 is provided between the reflecting unit 30 and the optical member 20 a or between the optical unit 10 and the reflecting unit 30. It is done.

  For example, the mechanism 300 is directly or indirectly engaged with the optical member 20a. For example, the mechanism 300 can be used in combination with arbitrary members that transmit operations such as gears, screws, and cams. Thereby, according to operation | movement of the mechanism 300, the optical member 20a can be rotated centering on the rotating shaft A1. A state S2 in FIG. 4B is a state in which the optical member 20a is rotated 180 degrees with respect to the state S1 in FIG.

  In this example, the mechanism 300 includes a first portion 301 and a second portion 302. The first portion 301 is connected to one end of the second portion 302. The shape of the first portion 301 is, for example, a cylindrical shape. As shown in FIG. 4C, the first portion 301 and the second portion 302 can rotate around the rotation axis A300. FIG. 4D shows a state in which the mechanism 300 is viewed along the extending direction of the rotation axis A300.

  The first portion 301 has a side surface 301f. The side surface 301f is a surface that intersects a plane perpendicular to the rotation axis A300. For example, the housing 51 is appropriately provided with an opening or the like, and the side surface 301f is in contact with the side surface (surface 17) of the optical member 20a. A material such as rubber is used for the side surface 301f.

  For example, the second portion 302 is an operation unit operated by the user. When the user rotates the second portion 302, the first portion 301 rotates. Thereby, the optical member 20a can be rotated by the frictional force between the side surface 301f and the surface 17.

FIG. 5A and FIG. 5B are schematic views illustrating the optical member according to the first embodiment.
The upper part of FIG. 5A is a schematic side view illustrating the optical member 20a used in the display device 100b. The lower part of FIG. 5A is a schematic plan view illustrating the optical member 20a. As shown in FIG. 5A, the optical member 20a may be a gear that rotates about the rotation axis A1. For example, unevenness may be provided on a part of the side surface of the optical member 20a (the gear portion 20g), and the unevenness may be used as gear teeth. Alternatively, as shown in FIG. 5B, a frame 20f having gear teeth may be attached to the optical member 20a. The frame 20f has an outer surface provided with teeth and an inner surface corresponding to the shape of the side surface of the optical member 20a. The frame 20f is attached to the optical member 20a so that the inner surface is positioned between the outer surface and the optical member 20a.

  When such a gear is used, for example, the first portion 301 is also provided with corresponding irregularities (teeth). The teeth of the first portion 301 engage with the teeth of the optical member 20a. Thereby, the optical member 20 a can be rotated in accordance with the rotation of the first portion 301.

  As described above, the user can move the mechanism 300 by directly or indirectly operating the mechanism 300. Thereby, the user can rotate the optical member 20a. The optical member 20a can be rotated through the mechanism 300 while the user is observing a virtual image using the display device 100b. Thereby, the user can determine the position of the virtual image according to the user's preference while confirming the position of the virtual image.

  The mechanism 300 is disposed on a surface close to the reflection unit 30 among the side surfaces of the holding unit 50. As a result, the mechanism 300 is unlikely to contact the face of the user of the display device 100b. Therefore, it is possible to suppress a decrease in the wearability of the display device 100b.

FIG. 6 is a schematic plan view illustrating an optical member used in the display device according to the first embodiment.
FIG. 6 shows an example of the optical path deflecting element (first optical member 20) described in FIG. For example, a prism 400 can be used for the first optical member 20. The prism 400 has a surface 401 (first surface) and a surface 402 (second surface). In this example, the surface 401 and the surface 402 are flat surfaces.

  For example, in a state where the holding unit 50 holds the prism 400, the image light 200 enters the surface 401 and is emitted from the surface 402. The surface 402 is inclined with respect to the surface 401. In a state where the prism 400 is held by the holding unit 50, an angle formed by at least a part of the surface 401 and the direction D1 is different from an angle formed by at least a part of the surface 402 and the direction D1.

  A deflection angle is determined by an angle θ between the surface 401 and the surface 402. Thereby, the position of the virtual image displayed on the display device 100 is determined. Note that the surface 401 and the surface 402 are flat surfaces in FIG. 6, but are not necessarily flat surfaces. For example, the surface 401 and the surface 402 may be any shape such as a spherical surface, a free-form surface, or a cylindrical surface.

FIG. 7 is a schematic plan view illustrating an optical member used in the display device according to the first embodiment.
In the example illustrated in FIG. 7, the holding unit 50 holds the decentered lens group 500. Except for this, FIG. 7 can be applied with the same description as that of FIG.

The decentered lens group 500 includes a first optical member 20 and a second optical member 22. In this example, an eccentric lens 501 is used as the first optical member 20, and an eccentric lens 502 is used as the second optical member 22. Glass or acrylic can be used as a material for the decentering lens 501 and the decentering lens 502. The holding unit 50 holds each of the eccentric lens 501 and the eccentric lens 502 in a detachable manner. The decentering lens 502 is disposed between the decentering lens 501 and the reflecting unit 30 on the optical path of the image light 200.
The decentering lens 501 has a surface 15a (first surface), a surface 16a (second surface), and a main shaft 501a. At least one of the surface 15a and the surface 16a is a curved surface. The decentering lens 502 has a surface 15b (third surface), a surface 16b (fourth surface), and a main shaft 502a. At least one of the surface 15b and the surface 16b is a curved surface. In a state where the decentered lens group is held by the holding unit 50, the surface 15a and the surface 15b are surfaces on which image light is incident, and the surface 16a and the surface 16b are surfaces on which image light is emitted.

The decentered lens group 500 deflects the image light 200 to the image light 220. The principal ray 201, the principal axis 501a, and the principal axis 502a of the image light 200 are not arranged in the same straight line. Thereby, the decentered lens group 500 can deflect the image light 200 to the image light 220.
That is, the principal ray 201 is incident on the eccentric lens 501 along the direction D1, and is emitted from the eccentric lens 501 along the direction D2. The principal ray 201 that has passed through the decentering lens 501 enters the decentering lens 502 along the direction D2, and is emitted from the decentering lens 502 along a direction D5 different from the directions D1 and D2. The chief ray 201 emitted from the decentering lens 502 travels along the direction D5.

  Here, the case where the eccentric lens group 500 includes two lenses is illustrated. However, in practice, the decentered lens group 500 may include one decentered lens or three or more decentered lenses. As the decentering lens, a spherical lens, a cylindrical lens, a free-form surface lens, or the like can be used.

FIG. 8 is a schematic plan view illustrating the display device according to the first embodiment.
FIG. 8 illustrates the display device 100 described with reference to FIG. As described above, the holding unit 50 holds the optical path deflecting element (the first optical member 20 or the like) in a detachable manner. FIG. 8 shows a state where the optical path deflecting element is not attached to the holding unit 50. As described above, for example, by attaching an optical path deflecting element such as a prism to the holding unit 50, the direction of the principal ray of the image light 200 can be deflected.

  The holding unit 50 may hold an element such as the light shielding plate 56. For example, the display of the display device 100 can be turned off by attaching the light shielding plate 56 to the holding unit 50. When the structure of the light shielding plate 56 includes liquid crystal, the display image displayed on the display device 100 can be controlled by voltage control on the liquid crystal. For example, the voltage control can partially block the display image, lower the luminance of the display image, or completely block the light.

  As described above, according to this embodiment, when the user adjusts the position of the image displayed by the optical see-through HMD, the degree of freedom of the image display position can be improved.

  By the way, for manufacturing a Fresnel mirror or a multi-mirror array used for the reflection unit 30, for example, a method of transferring a shape using a mold is used. At this time, when the material used is changed using the same mold, for example, when glass is changed to acrylic, the direction of the reflected image formed by the reflecting surface 31 changes due to the difference in the refractive index of the material. That is, the position of the virtual image displayed on the display device 100 changes. Even in such a case, if the display device according to the present embodiment is used, the display position of the image can be adjusted, and an easy-to-see image can be displayed. Specifically, the deflection angle of the optical path deflecting element is designed based on the refractive index of the material used for the reflecting unit 30. Thereby, even when the material is changed, a virtual image can be displayed at an appropriate position. For example, a virtual image can be displayed at the same position regardless of the material of the reflection unit 30. By manufacturing a plurality of reflective portions using different materials from the same mold, it is possible to manufacture an optically transmissive HMD with improved chemical resistance and impact resistance at low cost.

(Second Embodiment)
FIG. 9 is a schematic plan view illustrating a display device according to the second embodiment.
FIG. 10 is a block diagram illustrating a display device according to the second embodiment.
Also in the display device 102 according to the present embodiment, the optical unit 10, the reflection unit 30, the holding unit 40, the holding unit 50, and the like are provided as in the display device 100. About these, the description similar to the description regarding 1st Embodiment is applicable.

  The display device 102 further includes an optical path deflection element detection unit 122 and a circuit unit 110a (processing unit). The circuit unit 110 a includes an image correction unit 120 and an optical path deflection angle output unit 121. The image correction unit 120 and the optical path deflection angle output unit 121 are incorporated in the circuit unit 110a, for example.

  The circuit unit 110a is electrically connected to the optical unit 10 (display unit 11) by the cable 111, as in the first embodiment. The circuit unit 110a is connected to the optical path deflection element detection unit 122 by wire or wirelessly.

The optical path deflection element detection unit 122 is provided in the holding unit 50, for example.
The optical path deflection element detection unit 122 detects holding information regarding whether or not the optical path deflection element (the first optical member 20 or the like) is held by the holding unit.

  Further, for example, when the optical path deflecting element is held by the holding unit, the optical path deflecting element detecting unit 122 has an identification code (ID) associated with the held optical path deflecting element (first optical member 20). ) And other member information is detected.

  Further, for example, the optical path deflection element detection unit 122 detects arrangement information regarding at least one of the relative arrangement of the optical path deflection element and the optical unit 10 and the relative arrangement of the optical path deflection element and the reflection unit 30. This arrangement information is the rotation angle of the optical path deflecting element with respect to an arbitrary reference when the optical path deflecting element is rotatable as described with reference to FIGS. 2 (a) to 2 (c).

  For example, each optical path deflecting element attached to the holding unit 50 is provided with a barcode or RFID (RF tag) for holding an identification code (member information). In this case, a sensor capable of reading a barcode or RFID can be used for the optical path deflection element detection unit 122.

  When the optical path deflecting element is rotatable, the optical path deflecting element detecting unit 122 can be a sensor such as a potentiometer that detects the rotation angle described above. The display device 102 may include a mechanical mechanism (mechanism 300) that adjusts the rotation angle of the optical path deflecting element in stages. For example, the mechanism 300 is provided with a scale such as a dial indicating the rotation angle, and the rotation angle of the optical path deflecting element is adjusted step by step. The optical path deflection element detection unit 122 detects the scale value as arrangement information of the optical path deflection element.

  In addition, an arbitrary sensor such as a camera and a combination thereof may be used for the optical path deflection element detection unit 122.

  The optical path deflection element detection unit 122 outputs at least one of the above holding information, member information, and arrangement information to the optical path deflection angle output unit 121.

  The optical path deflection angle output unit 121 calculates deflection angle information based on at least one of holding information, member information, and arrangement information, and outputs the deflection angle information to the image correction unit 120. Here, the deflection angle information is information regarding a bending angle (deflection angle) that the optical path deflection element attached to the holding unit 50 gives to the principal ray of the image light. The deflection angle is, for example, an angle between the direction D1 and the direction D2 illustrated in FIG. Such deflection angle information is uniquely determined, for example, with respect to the optical path deflection element and its arrangement. For this reason, deflection angle information can be calculated based on the above-mentioned member information and arrangement information.

  The image correction unit 120 acquires data of a target image (input image) from an external storage medium or a network via wired or wireless. The image correction unit 120 corrects the target image based on the deflection angle information and generates image information. That is, the circuit unit 110a generates image information based on at least one of the holding information, member information, and arrangement information. The display unit 11 emits light based on the generated image information. Thereby, for example, an appropriate image can be displayed. Specifically, for example, processing such as affine deformation of the input image so as to correct various aberrations is performed on the light image of each color of RGB. Thereby, it becomes possible to suppress aberration. Since the aberration that occurs in the optical path deflecting element is determined in accordance with the shape of the optical path deflecting element, correction processing that is paired with the optical path deflecting element is performed.

  Note that at least one of the holding information, member information, arrangement information, and deflection angle information may be based on information input to the display device 102 by the user 60. For example, the user 60 inputs arrangement information (for example, a scale value) indicating the rotation angle of the optical change element to the display device 102. Thereby, the correction in the image correction unit 120 can be changed by the user 60. For example, software (application) is installed in a computer or a portable terminal, and information is input from the user 60 to the circuit unit 110a via the computer or the portable terminal. The deflection angle may be directly input to the circuit unit 110a.

FIG. 11A to FIG. 11D are schematic views illustrating the operation of the display device.
FIG. 11A illustrates a display device 109 of a reference example. The display device 109 includes a reflection unit 30b, an optical unit 10b, a holding unit 50b that holds the optical member 20b (optical path deflecting element), and the like.
The reflection unit 30b, the optical unit 10b, the optical member 20b, and the holding unit 50b are the same as the reflection unit 30, the holding unit 40, the optical unit 10, the first optical member 20, and the holding unit 50, respectively.
The display device 109 is different from the display device 102 of FIG. 9 in that the display device 109 does not include the optical path deflection element detection unit 122, the optical path deflection angle output unit 121, and the image correction unit 120.

  FIG. 11A shows a first state ST1 in which the optical member 20b is attached to the holding portion 50b, and a second state ST2 in which the optical member 20b is removed from the holding portion 50b. For example, with respect to the incident angle of the light emitted from the optical unit 10b at the reflecting unit 30b, the incident angle in the first state ST1 is smaller than the incident angle in the second state.

  In a glasses-type display device, light including image information is projected obliquely on the reflecting portion. For example, the incident angle at the reflection part of the light emitted from the optical part is relatively large. In the display portion, a plurality of pixels that emit light are arranged on a plane. For this reason, the optical path length to the pupil 150 differs depending on the position where the pixel is provided on the display unit. As a result, aberration may occur in the glasses-type display device, and the displayed image may be distorted.

  The plurality of pixels provided in the display unit include, for example, a pixel that emits red light, a pixel that emits green light, and a pixel that emits blue light. Thereby, a color image can be displayed. In this case, chromatic aberration may occur due to the optical system (for example, the optical unit 10b and the optical member 20b). When an optical path deflection element such as a prism is used, the magnitude (degree) of chromatic aberration changes according to the deflection angle.

  FIG. 11B is an example of an image PI displayed on the display unit 11 b of the display device 109. The image PI is an image of a white lattice pattern Pw. FIG. 11C is an example of a virtual image in the first state ST1 when the image PI is displayed on the display unit 11b. FIG. 11D is an example of a virtual image in the second state ST2 when the image PI is displayed on the display unit 11b. As illustrated in FIG. 11C and FIG. 11D, the displayed virtual image has a distorted shape with respect to the image PI.

  For example, a white line is displayed by overlapping red light, blue light, and green light. In the virtual images of FIGS. 11C and 11D, the positions of the red light image Pr, the blue light image Pb, and the green light image Pg are different from each other, and the white line is not properly displayed. .

  In the first state ST1 using the optical member 20b, the distortion of the virtual image is larger and the influence of chromatic aberration (color breakup) may be larger than in the second state ST2. Thus, distortion or the like occurs in the displayed image according to the deflection angle by the optical path deflecting element.

  On the other hand, in the display device 102 according to the embodiment, the input image is corrected by the image correction unit 120 so as to suppress the influence of such aberration. This makes it possible to display an easy-to-see virtual image with little distortion of the image.

  FIG. 12 is a block diagram illustrating an image correction unit of the display device according to the second embodiment. As illustrated in FIG. 12, the image correction unit 120 includes a coordinate conversion unit 123, a correction LUT selection unit 124, and an LUT storage unit 125.

  The LUT storage unit 125 stores a lookup table (LUT). For example, in the LUT, a plurality of correction coefficients (for example, matrices) for performing correction in the image correction unit 120 are stored in advance. Each of the plurality of correction coefficients is determined in advance based on, for example, a deflection angle related to each optical path deflecting element.

The LUT storage unit 125 stores a plurality of correction LUTs. The plurality of correction LUTs include, for example, a correction coefficient 125a and a correction coefficient 125c.
The correction coefficient 125a is a coefficient used when the holding unit 50 holds the optical member 20a. The correction coefficient 125a corresponds to the ID (member information) of the optical member 20a. Further, for example, the correction coefficient 125a corresponds to arrangement information (such as a rotation angle) of the optical member 20a.

  Similarly, the correction coefficient 125c is a coefficient used when an optical member 20c different from the optical member 20a is attached. The correction coefficient 125c corresponds to the ID (member information) of the optical member 20c. Further, for example, the correction coefficient 125c corresponds to arrangement information (such as a rotation angle) of the optical member 20c.

  The correction LUT selection unit 124 acquires the above deflection angle information from the optical path deflection angle output unit 121. As described above, the deflection angle information is based on at least one of holding information, member information, and arrangement information. The correction LUT selection unit 124 selects a correction coefficient corresponding to the acquired deflection angle information.

  The coordinate conversion unit 123 corrects the input image using the correction coefficient selected by the correction LUT selection unit 124. For example, the coordinate conversion unit 123 converts the coordinates of each pixel of the input image by multiplying the input image by a correction coefficient, and generates image information. The display unit 11 displays the image information converted (corrected) in this way.

  For example, when the holding unit 50 holds the first optical member 20, the correction LUT selection unit 124 selects the first correction coefficient from the plurality of correction coefficients stored in the LUT storage unit 125. Here, the first correction coefficient is a correction coefficient corresponding to the ID (member information) of the first optical member 20. The correction LUT selection unit 124 selects the first correction coefficient based on the ID of the first optical member 20. Alternatively, the first correction coefficient is a correction coefficient corresponding to arrangement information such as the rotation angle of the first optical member 20. The correction LUT selection unit 124 selects the first correction coefficient based on the arrangement information of the first optical member 20. The coordinate conversion unit 123 corrects the input image using the selected first correction coefficient to generate image information.

  As described above, it is possible to display a virtual image in which the influence of the aberration is suppressed according to the type of the optical path deflecting element (that is, the above-described member information) and the mounting direction of the optical path deflecting element (that is, the above-described arrangement information).

  In the above example, the image correction unit 120 stores a plurality of correction coefficients in advance. Thereby, the amount of calculation performed by the image correction unit 120 is reduced. Therefore, the amount of power required for the display device 102 can be reduced.

  Note that the block diagrams shown in FIGS. 10 and 12 are examples, and may not necessarily match the actual modules. For example, a part of each block (for example, the LUT storage unit 125) may be provided separately from the display device.

  An integrated circuit such as LSI (Large Scale Integration) or an IC (Integrated Circuit) chip set can be used for a part or all of each block of the circuit unit 110a (processing unit). An individual circuit may be used for each block, or a circuit in which part or all of the blocks are integrated may be used. Each block may be provided integrally, or a part of the blocks may be provided separately. In addition, a part of each block may be provided separately. The integration is not limited to LSI, and a dedicated circuit or a general-purpose processor may be used.

FIG. 13 is a schematic view illustrating the display device according to the embodiment.
FIG. 13 illustrates an example of a system configuration of the display device according to the embodiment.
As illustrated in FIG. 13, the circuit unit 110 (or the circuit unit 110 a) includes, for example, an interface 112, a processing circuit (processor) 113, and a memory 114.

  For example, the circuit unit 110 is connected to an external storage medium or network via the interface 112 and acquires an input image. For connection to the outside, either a wired or wireless method may be used.

  For example, the memory 114 stores a program 115 for processing the acquired input image. For example, the input image is appropriately converted on the basis of the program 115, whereby appropriate display is performed on the display unit 11. Image information may be stored in the memory 114. The program 115 may be provided in a state stored in the memory 114 in advance, or may be provided via a storage medium such as a CD-ROM or a network, and may be installed as appropriate.

  The image information thus obtained is input from the circuit unit 110 to the optical unit 10 and displayed on the display device.

  For example, the optical path deflection angle of the optical path deflection element (first optical member 20) is detected by the sensor 116. The LUT used for correction in the image correction unit 120 is stored in the memory 114, for example. Further, for example, processing in the correction LUT selection unit 124 and the coordinate conversion unit 123 is performed in the processing circuit 113 based on the program 115.

Note that the example illustrated in FIG. 13 is an example of the display device according to the embodiment, and may not necessarily match an actual module.
The display device has been described above as an embodiment. However, the embodiment may be an image processing apparatus that performs image processing in the circuit unit 110a. Alternatively, the embodiment may be in the form of a program for causing a computer to execute the process. Alternatively, the embodiment may be in the form of a computer-readable recording medium that records this program. Specific examples of the recording medium include CD-ROM (-R / -RW), magneto-optical disk, HD (hard disk), DVD-ROM (-R / -RW / -RAM), and FD (flexible disk). ), A flash memory, a memory card, a memory stick, and other various ROMs and RAMs. A program for causing a computer to execute the processing of the circuit unit according to the above-described embodiment may be recorded and distributed on these recording media. This facilitates the realization of image processing. Then, the information processing apparatus such as a computer is loaded with the recording medium as described above, and the image processing program is read by the information processing apparatus, or the program is stored in a storage medium included in the information processing apparatus, Read accordingly. Thereby, the image processing according to the embodiment can be executed.

  According to the embodiment, an easy-to-see display device can be provided.

  In the present specification, “vertical” and “parallel” include not only strictly vertical and strictly parallel, but also include, for example, variations in the manufacturing process, and may be substantially vertical and substantially parallel. It ’s fine.

The embodiments of the present invention have been described above with reference to specific examples. However, embodiments of the present invention are not limited to these specific examples. For example, regarding the specific configuration of each element such as an optical unit, a reflection unit, a holding unit, an optical member, and a processing unit, those skilled in the art can implement the present invention in the same manner by appropriately selecting from a well-known range. As long as an effect can be obtained, it is included in the scope of the present invention.
Moreover, what combined any two or more elements of each specific example in the technically possible range is also included in the scope of the present invention as long as the gist of the present invention is included.

  In addition, all display devices that can be implemented by a person skilled in the art based on the above-described display device as an embodiment of the present invention are included in the scope of the present invention as long as they include the gist of the present invention. .

  In addition, in the category of the idea of the present invention, those skilled in the art can conceive of various changes and modifications, and it is understood that these changes and modifications also belong to the scope of the present invention. .

  Although several embodiments of the present invention have been described, these embodiments are 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 changes 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 invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10, 10b ... Optical part, 10p ... Surface, 11, 11b ... Display part, 11e ... Pixel, 12 ... Optical element, 15, 16, 17 ... Surface, 20 ... First optical member, 20a, 20b, 20c ... Optical member 20f ... Frame, 20g ... Gear portion, 20p, 20q ... Uneven portion, 20s ... Main body portion, 21a ... First end portion, 22 ... Second optical member, 22a ... Second end portion, 30, 30b ... Reflecting portion, 31 ... Reflecting surface, 40 ... Holding part, 50, 50b ... Holding part, 51 ... Housing part, 52 ... Opening part, 55 ... Part of holding part, 56 ... Shading plate, 60 ... User, 100, 100a, 100b, 102, 109 ... display device, 110, 110a ... circuit part, 111 ... cable, 112 ... interface, 113 ... processing times, 114 ... memory, 115 ... program, 116 ... sensor DESCRIPTION OF SYMBOLS 120 ... Image correction part, 121 ... Optical path deflection angle output part, 122 ... Optical path deflection element detection part, 123 ... Coordinate conversion part, 124 ... Correction LUT selection part, 125 ... LUT storage part, 125a, 125c ... Correction coefficient, 150 ... pupil, 200 ... image light, 201 ... chief ray, 210 ... image light, 220 ... image light, 300 ... mechanism (structure part), 301 ... first part, 301f ... side face, 302 ... second part, 400 ... prism 401, 402 ... surface, 500 ... decentered lens group, 501 ... decentered lens, 501a ... main shaft, 502 ... decentered lens, 502a ... main shaft, A1, A300 ... rotating shaft, D1, D2, D3, D5 ... direction, La, Lb ... Length, PI ... Image, Pb, Pg, Pr ... Image, Pw ... Lattice pattern, S1, S2, ST1, ST2 ... State

Claims (9)

An optical unit that emits image light including image information;
A reflecting portion for reflecting at least a part of the image light;
A holding unit for detachably holding the first optical member;
With
The first optical member is provided between the optical unit and the reflection unit on the optical path of the image light,
A display device in which a principal ray of the image light is incident on the first optical member along a first direction and is emitted from the first optical member along a second direction different from the first direction. The first optical member includes
A first end;
A second end portion spaced apart from the first end portion in a third direction intersecting the first direction in a state where the first optical member is held by the holding portion;
The display device according to claim 1, wherein a length of the first end portion along the first direction is longer than a length of the second end portion along the first direction.   The display device according to claim 2, wherein the first optical member is rotatable about an axis extending in a direction intersecting the third direction in a state where the first optical member is held by the holding portion. It further comprises a structural part,
At least a part of the structure part is provided between the reflection part and the first optical member, or between the reflection part and the optical part,
The display device according to claim 3, wherein the first optical member rotates in accordance with an operation of the structure portion.   The display device according to claim 1, further comprising a processing unit that generates the image information based on holding information regarding whether or not the first optical member is held by the holding unit. .   The display device according to claim 1, further comprising a processing unit that generates the image information based on member information associated with the first optical member.   A processing unit that generates the image information based on arrangement information regarding at least one of a relative arrangement of the first optical member and the optical unit and a relative arrangement of the first optical member and the reflecting unit. The display device according to any one of claims 1 to 4, further comprising: The processor is
Processing to acquire the target image;
A process of selecting the first correction coefficient based on the member information from a plurality of correction coefficients including a first correction coefficient corresponding to the member information;
Processing to correct the target image using the first correction coefficient to generate the image information;
The display device according to claim 6 which performs. The processor is
Processing to acquire the target image;
A process of selecting the first correction coefficient based on the arrangement information from a plurality of correction coefficients including a first correction coefficient corresponding to the arrangement information;
Processing to correct the target image using the first correction coefficient to generate the image information;
The display device according to claim 7.