JP2017044853A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-see-display device.SOLUTION: According to an embodiment, the display device including a display part, a reflection part and an optical part is provided. The display part which emits image light based on an object image including a first area and a second area has a first pixel corresponding to the first area and a second pixel corresponding to the second area. The reflection part includes a first reflection surface and a second reflection surface along the first reflection surface. The optical part is provided between the reflection part and the display part. The image light includes first light emitted from the first pixel and second light emitted from the second pixel. The first light and the second light enter the first reflection surface. The first reflection surface reflects a part of the first light and transmits other part of the first light. The second reflection surface reflects the other part of the first light transmitted through the first reflection surface. The incidence angle of the first light with respect to the first reflection surface is greater than that of the second light with respect to the first reflection surface. When the brightness of the second area is equal to that of the first area, the second light is brighter than the first light.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a display device.

  For example, there is a display device including a display unit that emits image light including image information and a reflection unit 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 obtain an easy-to-see display.

JP 2002-287077 A

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

  According to the embodiment of the present invention, a display device including a display unit, a reflection unit, and an optical unit is provided. The display unit emits image light based on a target image including a first region and a second region. The display unit includes a first pixel corresponding to the first region and a second pixel corresponding to the second region. The reflection part includes a first reflection surface and a second reflection surface along the first reflection surface. The optical unit is provided between the reflection unit and the display unit on the optical path of the image light. The image light includes first light emitted from the first pixel and second light emitted from the second pixel. The first light and the second light are incident on the first reflecting surface. The first reflecting surface reflects a part of the first light and transmits another part of the first light. The second reflecting surface reflects the another part that has passed through the first reflecting surface. The incident angle of the first light with respect to the first reflecting surface is larger than the incident angle of the second light with respect to the first reflecting surface. When the brightness of the second region is equal to the brightness of the first region, the second light is brighter than the first light between the display unit and the reflection unit.

It is a schematic plan view which shows the use condition of the display apparatus which concerns on 1st Embodiment. FIG. 2A to FIG. 2D are schematic views showing the display device according to the first embodiment. It is a schematic diagram which shows operation | movement of the display apparatus which concerns on 1st Embodiment. FIG. 4A and FIG. 4B are schematic views illustrating the operation of the display device according to the first embodiment. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. FIG. 6A and FIG. 6B are schematic views showing another display device according to the first embodiment. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. FIG. 8A to FIG. 8C are schematic diagrams illustrating a display device. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. FIG. 10A and FIG. 10B are schematic views showing another display device according to the first embodiment. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. FIG. 13A and FIG. 13B are schematic perspective views showing the display device according to the first embodiment. It is a schematic diagram which shows another display apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the display apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows another display apparatus which concerns on 2nd Embodiment. It is a block 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. 1 is a schematic plan view illustrating the usage state of the display device according to the first embodiment.
FIG. 2A to FIG. 2D are schematic views illustrating the display device according to the first embodiment. As shown in FIG. 1, the display device 100 according to the present embodiment is, for example, an HMD (head mounted display) that can be attached to the head of a user 200. Light based on the display target image is projected from the display device 100 toward the pupil 201 (eyeball) of the user 200. With this light, the user 200 sees a virtual image of the image.

  In this example, the display device is a monocular HMD. That is, an image is displayed on one eyeball of the user's 200 using one display device 100. However, the embodiment may be a binocular HMD that displays images on both eyes using two display devices 100.

  FIG. 2A is an enlarged view of a portion of FIG. 1 illustrating the display device 100. As shown in FIGS. 1 and 2A, the display device 100 includes a display unit 10, a reflection unit 20, an optical unit 30 (projection unit), and a processing unit 40 (image processing unit).

  The processing unit 40 is a circuit such as an IC (Integrated Circuit). The processing unit 40 acquires a display target image (hereinafter referred to as a target image) from an external memory or the like. As will be described later, the processing unit 40 appropriately corrects the target image to generate a processed image (corrected image).

  The display unit 10 is a display that displays an image. The display unit 10 includes a plurality of pixels 10e arranged on a plane. The display unit 10 is connected to the processing unit 40 by wire or wireless. Thereby, the display unit 10 acquires the processed image generated by the processing unit 40. The plurality of pixels 10e emit light according to the acquired processed image. That is, the display unit 10 (a plurality of pixels 10e) emits image light Le based on the target image input to the display device 100. In addition, the display used as the display part 10 can use arbitrary systems, such as a liquid crystal, organic EL, or LCOS (Liquid Crystal On Silicon).

  The optical unit 30 is provided between the display unit 10 and the reflection unit 20 on the optical path of the image light emitted from the display unit 10. The optical unit 30 changes the focal length and optical path of the image light emitted from the pixel 10 e of the display unit 10 and projects the image light toward the reflection unit 20. The optical unit 30 includes at least one or more optical elements. The optical element is, for example, a lens, a prism, or a mirror. In FIG. 2A, one lens 31 is represented as the optical unit 30. When the optical unit 30 includes a plurality of optical elements, the lens 31 is, for example, closest to the reflecting unit 20 among the plurality of optical elements. However, the position of the lens 31 is not limited to this. When the optical unit 30 includes a plurality of optical elements, the plurality of optical elements may not be arranged on a straight line.

  The reflection unit 20 includes a plurality of reflection surfaces 21 (reflection plates) and a holding unit 27. The holding unit 27 holds the plurality of reflecting surfaces 21 and fixes their positions. For example, the holding unit 27 is transmissive to image light, and the plurality of reflecting surfaces 21 are held inside the holding unit 27. In this example, a rectangular parallelepiped transparent resin is used as the holding portion 27. Note that a state having transparency to light (transparent) means a state in which the transmittance is higher than the reflectance with respect to the light and higher than the absorption with respect to the light. The shape of the holding unit 27 may be freely changed as long as the function of displaying an image is not lost. For example, the shape of the holding portion 27 may not be a rectangular parallelepiped shape. The holding unit 27 may include a frame that holds the resin or the reflective surface 21.

  Each of the plurality of reflecting surfaces 21 reflects a part of the image light toward the pupil 201 and transmits another part of the image light. Thereby, at least a part of the image light is projected onto the pupil 201. When viewed from the pupil 201 of the user 200, the projected image light forms an image 210 (see FIG. 1) as a virtual image.

  In this example, the reflective surface 21 is planar. The reflective surface 21 is a curved surface and may have refractive power. For the reflective surface 21, for example, metal (aluminum or the like) deposited on a member such as acrylic can be used. A dielectric multilayer film may be used for the reflective surface 21. The dielectric multilayer film is a film in which thin films containing a dielectric (for example, silicon oxide or titanium oxide) are stacked. The reflection characteristics are appropriately adjusted depending on the material of the reflection surface 21 and the laminated structure.

  The plurality of reflecting surfaces 21 include, for example, first to fourth reflecting surfaces 21a to 21d. On the optical path of the image light, a third reflecting surface 21c is provided between the fourth reflecting surface 21d and the display unit 10, and a second reflecting surface 21b is provided between the third reflecting surface 21c and the display unit 10. The first reflection surface 21 a is provided between the second reflection surface 21 b and the display unit 10.

  The plurality of reflecting surfaces 21 are provided side by side along the first direction D1. The first direction D1 is, for example, a direction connecting the center of the first reflecting surface 21a and the center of the second reflecting surface 21b. In the example of FIG. 2A, the first direction D <b> 1 is a direction in which image light is incident on the reflection unit 20, and is parallel to the optical axis 31 x of the lens 31. For example, the optical axis 31x intersects the center of the first reflecting surface 21a. For example, the viewing direction (front direction) of the user 200 is the second direction D2 perpendicular to the first direction D1.

  Each of the plurality of reflecting surfaces 21 is inclined with respect to the optical axis 31x of the lens 31 and the first direction D1. The angle θa between the reflecting surface 21 and the first direction D1 is not less than 30 degrees and not more than 45 degrees, for example, 45 degrees.

  The plurality of reflecting surfaces 21 are parallel to each other, for example. However, as will be described later, the plurality of reflecting surfaces 21 need only be provided so as to be along each other (substantially in parallel), and the angle between the adjacent reflecting surfaces 21 is within a range of, for example, 2 degrees or less, They may be inclined with respect to each other. In the example of FIG. 2A, the first reflecting surface 21a is parallel to the second reflecting surface 21b.

  A part of the image light incident on the first reflecting surface 21 a is reflected in the direction of the pupil 201. A part of the image light transmitted without being reflected by the first reflecting surface 21 a is incident on the second reflecting surface 21 b and reflected toward the pupil 201. Further, a part of the image light transmitted without being reflected by the second reflecting surface 21 b is incident on the third reflecting surface 21 c and reflected toward the pupil 201. In this way, reflection and transmission are repeated. Thereby, the image light is projected from the plurality of reflecting surfaces 21 onto the pupil 201 of the user 200.

  For example, when the pupil 201 is at the position A shown in FIG. 2A, the image light reflected by the first reflecting surface 21a reaches the pupil 201, and the image light reflected by the fourth reflecting surface 21d is The pupil 201 is not reached. On the other hand, when the pupil 201 is at the position B, the image light reflected by the first reflecting surface 21a does not reach the pupil 201, and the image light reflected by the fourth reflecting surface 21d reaches the pupil 201. Thus, all of the image light reflected by each reflecting surface 21 does not have to reach the pupil 201 at the same time. Only the image light projected from the reflecting surface 21 corresponding to the position of the pupil 201 reaches the pupil 201. Thereby, for example, even when the position of the pupil 201 changes from the position A to the position B, the user 200 can see the image of the target image.

  When there is only one reflecting surface 21, the position of the pupil 201 where the image can be seen is limited to a narrow range. On the other hand, in the embodiment, the plurality of reflecting surfaces 21 are provided as described above. As a result, the reflecting surface for projecting image light onto the pupil 201 is switched according to the pupil 201. As described above, the range (eye range ER) of the position of the pupil 201 where the user 200 can see the video is expanded. As already described, the angle θa between the first direction D1 and the reflecting surface 21 is, for example, 45 degrees. The angle θa between the first direction D1 and the reflecting surface 21 may be 30 degrees. Accordingly, the image light may be projected over a wide range by a small number of reflecting surfaces 21.

  Depending on the position of the pupil 201, image light may be simultaneously projected onto the pupil 201 from the two reflecting surfaces 21. At this time, the image observed by the user 200 is an image in which virtual images formed by the respective reflecting surfaces 21 overlap each other. In this case, if the position (or shape) of the virtual image is different for each reflecting surface 21, the virtual images formed by the reflecting surfaces 21 are shifted from each other. For this reason, two images may be observed simultaneously.

  When the position of the pupil 201 changes, the reflecting surface 21 that projects image light onto the pupil 201 may be switched. In this case, if the position (or shape) of the virtual image is different for each reflecting surface 21, the position of the virtual image may change abruptly when the reflecting surface is switched, and the image may become discontinuous.

  For this reason, it is desirable that the display positions (or shapes) of the virtual images formed by the image light reflected by the respective reflecting surfaces 21 coincide with each other. Therefore, the light emitted from one pixel of the display unit 10 is refracted by the optical unit 30 to be parallel light. When the image light becomes parallel light, the position of the virtual image is, for example, infinity when viewed from the user. Thereby, for example, the display position and the shape of the virtual image formed by each reflecting surface 21 can be matched with each other. This will be described with reference to FIG.

FIG. 3 is a schematic view illustrating the operation of the display device according to the first embodiment.
For example, as shown in FIG. 3, one of the plurality of pixels 10e emits a light beam Le1. The optical unit 30 (lens 31) makes a plurality of light beams included in the light beam Le1 parallel to each other.

  In FIG. 3, the first direction D1 is perpendicular to the user's line-of-sight direction De, and the reflecting surfaces 21 are parallel to each other. In this case, even if the position of the pupil 201 changes along the first direction D1, the traveling direction of the image light projected onto the pupil 201 with respect to the pupil 201 does not change. For this reason, the change V1 in the position of the virtual image 210 along the first direction D1 is substantially equal to the change V2 in the position of the pupil 201 along the first direction D1. In the case of parallel light, since the position of the virtual image is an infinite position when viewed from the user, even if the position of the pupil 201 changes along the first direction D1, the position of the virtual image in the line-of-sight direction is substantially Does not change. For this reason, the image shift accompanying the change in the position of the pupil 201 is hardly recognized.

  As described above, image light is projected from the side onto the plurality of reflecting surfaces 21 arranged in the first direction D1. That is, image light is projected onto the plurality of reflecting surfaces 21 from the optical unit 30 having the optical axis along the first direction D1. Thereby, when the position of the pupil 201 changes, the reflective surface which projects image light on the pupil 201 is switched. Therefore, the eye range can be widened. In the embodiment, the number of reflection surfaces 21 is two or more. However, it is preferable that the number of the reflective surfaces 21 be 3 or more. Thereby, it is possible to further widen the eye range.

  On the other hand, a display device of a reference example using a reflecting surface having a shape like the surface of a Fresnel lens has also been proposed. By reflecting the image light toward the pupil by this reflecting surface, the user can see a virtual image. However, in such a display device, in order to obtain an image with a wide angle of view, for example, the optical unit is enlarged as the reflecting surface is enlarged. For this reason, when the angle of view is enlarged, the display device becomes large. On the other hand, in the embodiment, since the image light is projected from the side of the plurality of reflecting surfaces 21, it is possible to suppress an increase in the size of the optical unit due to the expansion of the angle of view. An easy-to-view image with a wide angle of view can be obtained without increasing the size of the display device.

  A reference example in which image light is guided to the pupil by total reflection at a light transmissive member such as a holding unit is also conceivable. However, in this case, the optical path of the image light tends to be complicated. For this reason, light (stray light) traveling along an optical path different from the assumed optical path is likely to occur. In this reference example, high accuracy is required with respect to the shape and arrangement of optical elements such as reflecting surfaces. When stray light occurs, the image quality of the image observed by the user may deteriorate. In contrast, in the display device 100 according to the embodiment, a part of the image light emitted from the display unit 10 can reach the pupil 201 without being totally reflected by the holding unit 27. Generation of stray light can be suppressed, and deterioration of image quality can be suppressed.

  Next, the display device 100 will be further described with reference to FIGS. 2 (a) to 2 (d) again. The holding part 27 has a first surface 27a and a second surface 27b that are separated from each other in the second direction D2. The plurality of reflecting surfaces 21 are disposed between the first surface 27a and the second surface 27b. The second surface 27 b is a surface facing the user 200 of the holding unit 27.

2B is a schematic diagram illustrating the target image M1, FIG. 2C is a schematic diagram illustrating the processed image M2, and FIG. 2D is a schematic diagram illustrating the display unit 10. FIG.
The display unit 10 includes a first pixel 11 and a second pixel 12. For example, the first pixel 11 is provided at the end E1 of the display unit 10, and the second pixel 12 is provided at the end E2 of the display unit 10. The second end E2 is separated from the first end E1 in the second direction D2.

The processing unit 40 corrects the target image M1 and generates a processed image M2.
As illustrated in FIG. 2B, the target image M1 includes, for example, a first region R1 (pixel) and a second region R2 (pixel).
As shown in FIG. 2C, the processed image M2 includes a first post-processing area Ra1 (pixel) corresponding to the first area R1, and a second post-processing area Ra2 (pixel) corresponding to the second area R2. ,including. The first post-processing region Ra1 is a region where the pixel value of the first region R1 is converted by the correction processing, and the second post-processing region Ra2 is a region where the pixel value of the second region R2 is converted by the correction processing. It is.

The first pixel 11 is a pixel corresponding to the first region R1 and the first post-processing region Ra1. That is, as shown in FIG. 2A, the first pixel 11 emits the first light flux F1 according to the pixel value of the first post-processing area Ra1. The first light flux F1 includes the first light L1. The first light L1 is a light beam that passes through the center of the first light beam F1 among the light beams included in the first light beam F1.
The second pixel 12 is a pixel corresponding to the second region R2 and the second post-processing region Ra2. That is, the second pixel 12 emits the second light flux F2 according to the pixel value of the second post-processing area Ra2. The second light flux F2 includes the second light L2. The second light L2 is a light beam that passes through the center of the second light beam F2 among the light beams included in the second light beam F2.

  The first light L <b> 1 and the second light L <b> 2 pass through the optical unit 30 and enter the holding unit 27. The first light L1 and the second light L2 are incident on the first reflecting surface 21a.

  The first reflecting surface 21a reflects a part of the first light L1 (light L1a). The light L1a is emitted from the holding unit 27 on the second surface 27b.

  The first reflecting surface 21a transmits another part (light L1b) of the first light L1. The second reflecting surface 21b reflects the light L1b that has passed through the first reflecting surface 21a. The light L1b is emitted from the holding unit 27 on the second surface 27b.

  Similarly, a part of the second light L2 (light L2a) is reflected by the first reflecting surface 21a and emitted from the holding unit 27 on the second surface 27b. Another part of the second light L2 (light L2b) is transmitted through the first reflecting surface 21a, reflected by the second reflecting surface 21b, and emitted from the holding unit 27 on the second surface 27b.

  The difference between the incident angle θ1a and the incident angle θ1b shown in FIG. 2A is, for example, not less than 0 degrees and not more than 2 degrees. The incident angle θ1a is an incident angle of the first light L1 (or light L1a) with respect to the first reflecting surface 21a. The incident angle θ1b is an incident angle of the first light L1 (or light L1b) with respect to the second reflecting surface 21b. The second reflecting surface 21b is provided along the first reflecting surface 21a. In the example of FIG. 2A, the second reflecting surface 21b is parallel to the first reflecting surface 21a, so that the incident angle θ1a is equal to the incident angle θ1b. equal.

  Similarly, the difference between the incident angle θ2a and the incident angle θ2b is, for example, 0 degree or more and 2 degrees or less, and is 0 degree in the example of FIG. The incident angle θ2a is an incident angle of the second light L2 (or light L2a) with respect to the first reflecting surface 21a. The incident angle θ2b is an incident angle of the second light L2 (or light L2b) with respect to the second reflecting surface 21b.

  In the first reflecting surface 21a, the incident angle θ1a is larger than the incident angle θ2a. The difference between the incident angle θ1a and the incident angle θ2a is, for example, not less than 5 degrees and not more than 20 degrees. Similarly, in the second reflecting surface 21b, the incident angle θ1b is larger than the incident angle θ2b.

  For example, when the pupil 201 is at the position A shown in FIG. 2A, the light L1a reaches the pupil 201, and the light L2a does not reach the pupil 201. For example, when the pupil 201 is at the position A, the light L1b does not reach the pupil 201 and the light L2b reaches the pupil 201.

That is, in this example, the first reflective surface 21 a is used for displaying the virtual image of the first pixel 11, and the second reflective surface 21 b is used for displaying the virtual image of the second pixel 12.
In the display device 100, the reflective surface 21 close to the optical unit 30 among the plurality of reflective surfaces 21 is used for displaying pixels on the first end E <b> 1 side of the display unit 10. For the display of the pixels on the second end E2 side of the display unit 10, the reflective surface 21 far from the optical unit 30 among the multiple reflective surfaces 21 is used. The reflective surface 21 used for display changes depending on the position of the pupil 201.

  The number of times light passes through the reflecting surface 21 before reaching the pupil 201 differs depending on the pixels of the display unit 10. For example, when the pupil 201 is at the position A, the number of times the first light L1 passes through the reflecting surface 21 before reaching the pupil 201 is zero. On the other hand, the number of times the second light L2 passes through the reflecting surface 21 before reaching the pupil 201 is one. Depending on the position of the pupil 201, the number of times the first light L1 passes through the reflecting surface 21 before reaching the pupil 201 is, for example, 0 to 2 times. Depending on the position of the pupil 201, the number of times the second light L2 passes through the reflecting surface 21 before reaching the pupil 201 is, for example, 1 to 3 times.

  Since the amount of image light changes due to reflection and transmission, luminance unevenness may occur in the image. Since the light reflected by the reflecting surface 21 far from the optical unit 30 is transmitted more times through the reflecting surface 21 before reaching the pupil 201, the luminance decreases. That is, uneven brightness may occur in the left-right direction of the virtual image. In the example of FIG. 2A, the luminance of the right image near the optical unit 30 may be high, and the luminance of the left image far from the optical unit 30 may be low.

  On the other hand, in the display device 100, the processing unit 40 performs image processing. That is, the target image M1 input to the display device 100 is corrected to generate a processed image M2. Then, the display unit 10 emits image light according to the corrected processed image M2. In this correction, a luminance gradient opposite to the luminance gradient generated in the reflection unit 20 is set for the input target image M1. Thereby, the brightness | luminance gradient which arises in the reflection part 20 is suppressed (for example, cancellation).

  For example, consider a case where the luminance distribution in the target image M1 is uniform. “Brightness distribution is uniform” refers to a state in which pixel values of pixels are equal to each other with respect to a plurality of pixels representing an image, for example. The luminance of the pixel is represented by the pixel value. When the luminance distribution in the target image M1 is uniform, the brightness (luminance value) of the first region R1 and the brightness (luminance value) of the second region R2 are equal in the target image M1. At this time, in the processed image M2 generated by the processing unit 40, the luminance value of the second post-processing area Ra2 (pixel corresponding to the second pixel 12) is the first post-processing area Ra1 (corresponding to the first pixel 11). Higher than the luminance value of the pixel). In other words, the second post-processing area Ra2 is brighter than the first post-processing area Ra1. For this reason, between the display unit 10 and the reflection unit 20, the second light L <b> 2 emitted from the second pixel 12 is brighter than the first light L <b> 1 emitted from the first pixel 11. As described above, luminance unevenness can be suppressed and an easy-to-view image can be obtained.

  By the way, the reflectance of the reflective surface 21 may depend on the incident direction of light. In this case, it is desirable that the higher the incident angle, the higher the reflectance. The first light L <b> 1 having a large incident angle with respect to the reflection surface 21 is projected onto the pupil 201 by the reflection surface 21 close to the optical unit 30. For this reason, for example, the 1st light L1 does not need to permeate | transmit to the reflective surface 21 far from the optical part 30. FIG. On the other hand, the second light L <b> 2 having a small incident angle with respect to the reflecting surface 21 is projected onto the pupil 201 by the reflecting surface 21 far from the optical unit 30. For this reason, for example, it is desirable that the second light L <b> 2 is reflected by the reflection surface 21 far from the optical unit 30. Therefore, for example, the reflectance of the first reflecting surface 21a with respect to the first light L1 is made higher than the reflectance of the first reflecting surface 21a with respect to the second light L2.

FIG. 4A and FIG. 4B are schematic views illustrating the operation of the display device according to the first embodiment.
As described above, when the position of the pupil 201 changes, the reflecting surface 21 that projects image light onto the pupil 201 is also switched. For this reason, when the position of the pupil 201 changes, the luminance gradient caused by the reflecting unit 20 may change in the virtual image viewed by the user. Therefore, the processing unit 40 may correct the target image according to the position of the pupil 201 and adjust the luminance distribution in the processed image. For example, the display device 100 may be provided with a sensor that measures the position of the pupil 201. For this sensor, for example, an arbitrary sensor such as an infrared sensor or a visible camera can be used. The position of the pupil is measured (estimated) based on information such as an image obtained from the sensor. The measured value is input to the processing unit 40. A user may input a value into the processing unit 40 directly or indirectly. This value is, for example, a value according to the size and position of the pupil. The processing unit 40 performs correction processing based on the input value.

  For example, the correction is performed so that the integrated value of the light incident on the pupil 201 does not depend on the light traveling direction. 4A illustrates a state ST1 in which the pupil 201 is at the position C, and FIG. 4B illustrates a state ST2 in which the pupil 201 is at the position D.

As shown in FIG. 4A, in the state ST1, the image light is directed to the light Lp1 whose incident direction to the pupil 201 is the direction DL1, the light Lq1 whose incident direction to the pupil 201 is the direction DL2, and the pupil 201. Light Lr1 whose incident direction is the direction DL3.
Similarly, as shown in FIG. 4B, in the state ST2, the image light is a light Lp2 whose incident direction to the pupil 201 is the direction DL1, and a light Lq2 whose incident direction to the pupil 201 is the direction DL2. And light Lr2 whose incident direction to the pupil 201 is the direction DL3.

  For example, the processing unit 40 performs image processing so that the integrated value of the light Lp1 is equal to the integrated value of the light Lp2. That is, image processing is performed so that the light beam that travels in the direction DL1 and enters the pupil 201 in the state ST1 is equal to the light beam that travels in the direction DL1 and enters the pupil 201 in the state ST2.

  Similarly, image processing is performed so that the light beam that travels in the direction DL2 and enters the pupil 201 in the state ST1 is equal to the light beam that travels in the direction DL2 and enters the pupil 201 in the state ST2. Further, the image processing is performed so that the light beam traveling in the direction DL3 in the state ST1 and entering the pupil 201 is equal to the light beam traveling in the direction DL3 and entering the pupil 201 in the state ST2.

  Thereby, for example, the luminance gradient in the virtual image accompanying the movement of the pupil 201 can be suppressed. A predetermined fixed value may be used for the pupil diameter used for integration, or a value estimated from the brightness of external light may be used.

FIG. 5, FIG. 6A and FIG. 6B are schematic views illustrating another display device according to the first embodiment.
The display device 101 shown in FIG. 5 is different from the display device 100 described in regard to FIG. Other than this, the display apparatus 101 is the same as the display apparatus 100.

  In the display device 101, the distance between the adjacent reflecting surfaces is longer as it is optically separated from the display unit 10 (or the optical unit 30). The distance between the reflecting surfaces is a distance along a direction perpendicular to the reflecting surfaces or a distance between the centers of the reflecting surfaces.

  For example, the distance Ds2 between the center of the second reflecting surface 21b and the center of the third reflecting surface 21c is longer than the distance Ds1 between the center of the first reflecting surface 21a and the center of the second reflecting surface 21b.

  That is, the reflective surface closest to the second reflective surface 21b among the multiple reflective surfaces 21 is the first reflective surface 21a, and the reflective surface closest to the third reflective surface 21c among the multiple reflective surfaces 21 is It is the 2nd reflective surface 21b. Thereby, the uneven brightness in the virtual image viewed by the user can be further suppressed. This will be described with reference to FIGS. 6 (a) and 6 (b).

  In the display device 101b shown in FIGS. 6A and 6B, the plurality of reflecting surfaces 21 are arranged at equal intervals in the first direction D1. Other than this, the display device 101b is the same as the display device 101 of FIG. FIG. 6A shows the optical path of the light beam F1 emitted from the first pixel 11. FIG. FIG. 6B shows the optical path of the light beam F2 emitted from the second pixel 12.

  As shown in FIG. 6A, the light beam F1 is reflected by the light beam F1a reflected by the first reflection surface 21a, the light beam F1b reflected by the second reflection surface 21b, and the third reflection surface 21c. Light flux F1c. As already described, the image light emitted from the first pixel 11 has a large incident angle with respect to the reflecting surface 21. In this case, the light reflected by the reflecting surface 21 close to the optical unit 30 reaches the pupil 201 of the user. For example, the light flux F1a or the light flux F2a is projected onto the pupil 201 of the user. When the position of the pupil 201 changes, for example, a state in which an image by the light beam F1a is visible and a state in which an image by the light beam F1b is visible may be switched. Depending on the position of the pupil 201, the light flux F1a and the light flux F1b may be simultaneously projected onto the pupil 201. As shown in FIG. 6A, when there is a gap between the light flux F1a and the light flux F1b, a low luminance region is generated in the gap. For this reason, uneven brightness may occur in the virtual image. Therefore, as in the example of FIG. 5, the distance between the first reflecting surface 21a and the second reflecting surface 21b is shortened.

  As shown in FIG. 6B, the light beam F2 is reflected by the first reflection surface 21a, the light beam F2a reflected by the second reflection surface 21b, and the third reflection surface 21c. Light flux F2c. As already described, the incident angle with respect to the reflection surface 21 is small in the image light emitted from the second pixel 12. In this case, the light reflected by the reflecting surface 21 far from the optical unit 30 reaches the pupil 201 of the user. For example, the light flux F2b or the light flux F2c is projected onto the pupil 201 of the user. As shown in FIG. 6B, when there is a region where the light flux F2b and the light flux F2c overlap, a region with high luminance is generated. For this reason, uneven brightness may occur in the virtual image. Therefore, as in the example of FIG. 5, the distance between the second reflecting surface 21b and the third reflecting surface 21c is increased.

  Thus, the distance between the reflective surfaces 21 close to the optical unit 30 is shortened, and the distance between the reflective surfaces 21 far from the optical unit 30 is increased. Thereby, the brightness | luminance of a virtual image can be made easy to equalize.

FIG. 7 is a schematic view illustrating another display device according to the first embodiment.
The display device 102 shown in FIG. 7 is different from the display device 100 described in FIG. 2A in the holding unit 27 of the reflection unit 20. Other than this, the display device 102 is the same as the display device 100.
In the display device 102, the width W2 (length) along the second direction D2 of the lens 31 that causes the image light to enter the holding unit 27 is wider than the width W1 along the second direction D2 of the holding unit 27.

  When the width of the holding unit 27 is wide, the light incident on a part (outside) of the holding unit 27 may not pass. In this case, the width W1 of the holding portion 27 may be narrowed as shown in FIG. Thereby, a display apparatus can be reduced in weight.

  The holding unit 27 is separated from the optical unit 30. That is, the gap G <b> 1 is provided between the holding unit 27 and the optical unit 30. The reflective surface 21 is located in front of the user's eyes, for example. On the other hand, the optical unit 30 is arranged at a position away from the user's eyes so that it is difficult to enter the user's field of view. By not providing the holding unit 27 between the reflecting surface 21 and the optical unit 30, the display device can be reduced in weight. However, in the embodiment, a transparent member may be disposed between the optical unit 30 and the reflection unit 20 (reflection surface 21).

  Furthermore, the third surface 27c of the holding portion 27 may have a refractive power. The third surface 27c is provided between the first reflecting surface 21a and the optical unit 30 (lens 31). The third surface 27 c is a surface of the surface of the holding unit 27 on which image light enters the holding unit 27 from the optical unit 30. Thereby, the number of optical elements (lenses etc.) used for the optical part 30 can be reduced. Therefore, the display device can be reduced in weight.

FIG. 8A to FIG. 8C are schematic views illustrating display devices.
As shown in FIG. 8A, in the embodiment, each of the plurality of reflecting surfaces 21 does not intersect with the first surface 27 a of the holding unit 27 and does not intersect with the second surface 27 b. For example, the reflective surface 21 is separated from the second surface 27b by a distance Ln or more. Further, the reflecting surface 21 is separated from the first surface 27a by a distance Ln or more. Thus, a space is provided between the reflecting surface 21 and the surface of the holding portion 27.

  FIG. 8B illustrates a reference example in which the second surface 27b and the reflecting surface 21 intersect (or are in contact with). For example, light Ls of image light emitted from the display unit 10 enters the holding unit 27. As shown in FIG. 8B, the light Ls may be totally reflected by the second surface 27b. At this time, if the second surface 27 b and the reflection surface 21 intersect, the totally reflected light Ls enters the reflection surface 21. Thereby, stray light (for example, light Lsa) is generated. This stray light may form a double image at a position different from the correct virtual image. For this reason, it is desirable that total reflection does not occur in the display device. For example, the first surface 27a and the second surface 27b may be processed such as coating to suppress total reflection.

  Even if total reflection occurs, it is desirable to prevent the totally reflected light from entering the reflecting surface 21. This prevents stray light from traveling toward the user's pupil. As shown in FIG. 8C, when the reflecting surface 21 is away from the second surface 27b, the light Ls totally reflected by the second surface 27b is difficult to enter the reflecting surface 21. For this reason, a correct virtual image can be obtained.

  An example of the distance Ln shown in FIG. Let L be the distance between the end E21 and the third surface 27c (the distance along the first direction D1). Note that the end E21 is a position farthest from the optical unit 30 among the plurality of reflecting surfaces 21.

The light L11 is emitted from the first pixel 11 and totally reflected at the end of the holding unit 27 on the optical unit 30 side. An angle between the traveling direction of the totally reflected light L11 and the second surface 27b is θ1.
The light L12 is light emitted from the second pixel 12 and totally reflected at the end of the holding unit 27 on the optical unit 30 side. An angle between the traveling direction of the totally reflected light L12 and the second surface 27b is θ2.

  For example, the distance between the reflective surface 21 farthest from the optical unit 30 and the second surface 27b is L · tan (θ2) or less. In this case, the light L12 can be reflected by the reflecting surface 21 (fourth reflecting surface 21d) and travel toward the pupil 201. The distance between the reflective surface 21 farthest from the optical unit 30 and the second surface 27b is Ln = L · tan (−θ1) or more. Thereby, the light L11 does not enter the reflecting surface 21. Therefore, even if total reflection occurs on the surface of the holding portion 27, stray light can be suppressed from traveling toward the pupil.

FIG. 9 is a schematic view illustrating another display device according to the first embodiment.
In the display device 103 illustrated in FIG. 9, the optical unit 30 includes an optical element 32. The optical element 32 is, for example, an eccentric lens. A distance Ds3 between the second surface 27b and the first reflecting surface 21a is shorter than a distance Ds4 between the first surface 27a and the first reflecting surface 21a. Other than this, the display device 103 is the same as the display device 100 described above.

  For example, the optical axis of the optical element 32 is parallel to the first direction D1. The optical element 32 includes a first portion 32a and a second portion 32b. The thickness (length) of the second portion 32b along the first direction D1 is thicker than the thickness of the first portion 32a along the first direction D1.

  The first light L1 emitted from the first pixel 11 passes through the first portion 32a, enters the holding unit 27, and is emitted from the holding unit 27 on the second surface 27b. The second light L2 emitted from the second pixel 12 passes through the second portion 32b, enters the holding unit 27, and is emitted from the holding unit 27 on the second surface 27b.

  By using the decentered lens in this way, the incident angle θ1a and the incident angle θ2a become larger than those in the example of FIG. That is, the image light is incident on the holding unit 27 from one side (the upper side in the drawing) of the holding unit 27. Thereby, the distance Ds3 can be shortened. The holding part 27 can be made thin.

FIG. 10A and FIG. 10B are schematic views illustrating another display device according to the first embodiment.
In the display device 104 shown in FIG. 10A, the incident angle θ1b of the first light L1 with respect to the second reflecting surface 21b is larger than the incident angle θ1a of the first light L1 with respect to the first reflecting surface 21a. For example, the incident angle of the first light L <b> 1 with respect to the reflecting surface 21 is larger as the reflecting surface 21 is farther from the optical unit 30. Other than this, the display device 104 is the same as the display device 100 described above.

  In the display device 104, the plurality of reflecting surfaces 21 are inclined with respect to each other. For example, the angle between the first reflecting surface 21a and the second reflecting surface 21b is greater than 0 degree and equal to or less than 2 degrees. However, in the embodiment, as described above, the plurality of reflecting surfaces 21 may be parallel to each other. FIG. 10B illustrates a case where the plurality of reflecting surfaces 21 are parallel to each other.

  The optical unit 30 is, for example, a collimator lens. However, strictly speaking, the image light emitted from the optical unit 30 may not be parallel light. In this case, when the image light is focused at a distance, as shown in FIG. 10B, the virtual image 210 may appear as a double image. In such a case, as shown in FIG. 10A, the reflecting surface 21 is tilted so that the positions of the virtual images coincide. Thereby, the shift | offset | difference of the virtual image for every reflective surface 21 is correct | amended. As a result, the image quality of the virtual image is improved.

FIG. 11 is a schematic view illustrating another display device according to the first embodiment.
In the display device 105 illustrated in FIG. 11, the reflection unit 20 further includes a plurality of reflection surfaces 22. Other than this, the display device 105 is the same as the display device 100 described above.

  Similar to the reflective surface 21, the plurality of reflective surfaces 22 are provided inside the holding unit 27 and are held by the holding unit 27. The plurality of reflecting surfaces 22 are arranged in the first direction D1. The positions of the plurality of reflecting surfaces 22 in the second direction D2 are between the plurality of reflecting surfaces 21 and the second surface 27b. Each of the reflection surfaces 22 overlaps the two reflection surfaces 21 when viewed from the user.

  The plurality of reflection surfaces 22 include, for example, a reflection surface 22a, a reflection surface 22b, and a reflection surface 22c. The reflective surface 22a overlaps a part of the first reflective surface 21a and a part of the second reflective surface 21b in the second direction D2.

  For example, as shown in FIG. 11, a part of the image light (for example, the first light L1) is reflected by the second reflecting surface 21b, and then passes through the reflecting surface 22b (fourth reflecting surface) to be used by the user. Head towards. Another part of the image light reflected by the second reflecting surface 21b is further reflected by the reflecting surface 22b and the reflecting surface 22c and travels toward the user. Thereby, the range in which the image light is projected by the plurality of reflecting surfaces 22 is enlarged.

  As already described, when the position of the pupil 201 changes, the reflecting surface 21 that projects image light onto the pupil 201 is switched. When the reflecting surface 21 is switched, the luminance of the virtual image seen by the user may change. Therefore, the range in which the image light is projected by the plurality of reflecting surfaces 22 is enlarged. Thereby, the change of the brightness | luminance at the time of switching of the reflective surface 21 can be suppressed.

FIG. 12 is a schematic view illustrating another display device according to the first embodiment.
The display device 106 illustrated in FIG. 12 is different from the display device 100 in the arrangement of the plurality of reflection surfaces 21. Other than this, the display device 106 is the same as the display device 100.

  In the display device 106, the first direction D1 in which the plurality of reflecting surfaces 21 are arranged is inclined with respect to the optical axis 31x of the lens 31.

  The lens 31 includes a first portion 31a and a second portion 31b. The first light L1 emitted from the first pixel 11 passes through the first portion 31a. The second light L2 emitted from the second pixel 12 passes through the second portion 31b. The first portion 31 a has a first end Ea of the lens 31. The second portion 31 b has the second end Eb of the lens 31. The first end Ea and the second end Eb are separated from each other in the direction Dv perpendicular to the optical axis 31x.

  A distance Ds5 between the second end Eb and the first reflecting surface 21a along the direction Dv is longer than a distance Ds6 between the second end Eb and the second reflecting surface 21b along the direction Dv. Thereby, for example, the area of the first reflecting surface 21a that reflects the first light flux F1 is larger than the area of the first reflecting surface 21a that reflects the second light flux F2.

  The first light beam F <b> 1 emitted from the first pixel 11 is projected onto the pupil 201 by the reflecting surface 21 close to the optical unit 30. The first light flux F <b> 1 may not be reflected by the reflecting surface 21 far from the optical unit 30. On the other hand, the second light flux F <b> 2 emitted from the second pixel 12 is projected onto the pupil 201 by the reflecting surface 21 far from the optical unit 30. When the second light flux F2 is reflected by the reflecting surface 21 close to the optical unit 30, for example, the second light flux F2 travels to the regions Ra and Rb outside the eye range ER. For this reason, the 2nd light beam F2 does not need to be reflected by the reflective surface 21 close | similar to the optical part 30. FIG.

  By making the distance Ds5 longer than the distance Ds6, the first light flux F1 is easily reflected by the reflecting surface 21 close to the optical unit 30. For example, light that passes through a region A1 surrounded by a broken line in FIG. 12 is generated. Thereby, the brightness | luminance in a user's viewpoint end is adjusted. In addition, by making the distance Ds5 longer than the distance Ds6, the second light flux F2 is easily reflected by the reflecting surface 21 far from the optical unit 30. Thereby, light can be used efficiently.

FIG. 13A and FIG. 13B are schematic perspective views illustrating the display device according to the first embodiment.
FIG. 13A and FIG. 13B illustrate a reflection unit 20a and a reflection unit 20b as examples of the reflection unit 20 used in the display device according to the embodiment.

  In the reflecting part 20a shown in FIG. 13A, the first reflecting surface 21a has a side Sa1 along the extending direction Da1 and a side Sa2 along the extending direction Da2. The extending direction Da1 is a direction perpendicular to the first direction D1 in which the plurality of reflecting surfaces 21 are arranged. The extending direction Da2 is a direction inclined with respect to the first direction D1. The image light emitted from the display unit 10 and traveling in the incident direction Din is reflected by the reflecting surface 21 toward the reflecting direction Dref. In the example of FIG. 13A, the reflection direction Dref is, for example, a direction on a plane perpendicular to the second surface 27b of the holding unit 27.

  In the reflecting part 20b shown in FIG. 13B, the first reflecting surface 21a includes a first side Sb1 along the first extending direction Db1 and a second side Sb2 along the second extending direction Db2. Have. Each of the first extending direction Db1 and the second extending direction Db2 is inclined with respect to the first direction D1. In this case, the reflection direction Dref is, for example, a direction on a plane inclined with respect to the second surface 27b. Thus, the reflection direction Dref can be adjusted by inclining the reflection surface 21. Thereby, the position of the reflection part 20 with respect to a user's eyes can be adjusted. Therefore, the design of the display device 100 and the degree of design freedom can be improved.

FIG. 14 is a schematic view illustrating another display device according to the first embodiment.
In the display device 107 illustrated in FIG. 14, the reflection unit 20 further includes a plurality of light reflection surfaces 23 and a plurality of light reflection surfaces 24. Other than this, the same description as that of the display device 100 described above can be applied to the display device 107.

  The plurality of light reflecting surfaces 23 and the plurality of light reflecting surfaces 24 are provided inside the holding unit 27 and are held by the holding unit 27, similarly to the reflecting surface 21. The plurality of light reflecting surfaces 23 are located between the optical unit 30 and the plurality of reflecting surfaces 21 on the optical path of the first light L1. The plurality of light reflecting surfaces 24 are located between the optical unit 30 and the plurality of reflecting surfaces 21 on the optical path of the second light L2.

  The plurality of light reflecting surfaces 23 are arranged in the second direction D2. For example, each light reflecting surface 23 is planar, and the light reflecting surfaces 23 are parallel to each other. Each light reflecting surface 23 is inclined with respect to the first direction D1, and is inclined with respect to the second direction D2. The angle θb between each light reflecting surface 23 and the first direction D1 is, for example, not less than 43 degrees and not more than 47 degrees, and preferably 45 degrees. Each light reflecting surface 23 reflects, for example, a part of incident light and transmits a part thereof.

  Similarly, the plurality of light reflecting surfaces 24 are arranged in the second direction D2. For example, each light reflecting surface 24 is planar, and the light reflecting surfaces 24 are parallel to each other. Each light reflecting surface 24 is inclined with respect to the first direction D1, and is inclined with respect to the second direction D2. The angle θc between each light reflecting surface 24 and the first direction D1 is, for example, not less than 43 degrees and not more than 47 degrees, and preferably 45 degrees. Each light reflecting surface 24 reflects, for example, a part of incident light and transmits a part thereof.

  The light reflecting surface 24 is inclined with respect to the light reflecting surface 23. The angle θd between the light reflecting surface 23 and the light reflecting surface 24 is, for example, not less than 86 degrees and not more than 94 degrees, and preferably 90 degrees. In the present specification, the angle between the two reflecting surfaces is an angle between planes parallel to each reflecting surface.

In this example, the plurality of light reflecting surfaces 23 include a light reflecting surface 23a (first light reflecting surface) and a light reflecting surface 23b (second light reflecting surface). The plurality of light reflecting surfaces 24 include a light reflecting surface 24a (third light reflecting surface) and a light reflecting surface 24b (fourth light reflecting surface).
A light reflecting surface 23a is provided between the light reflecting surface 23b and the light reflecting surface 24b, and a light reflecting surface 24a is provided between the light reflecting surface 23a and the light reflecting surface 24b.

  At least a part of the first light L1 is reflected by the light reflecting surface 23a, then reflected by the light reflecting surface 23b, and then enters the reflecting surface 21. At least a part of the second light L2 is reflected by the light reflecting surface 24a, then reflected by the light reflecting surface 24b, and then enters the reflecting surface 21.

  Thus, the light flux (image light) incident on the plurality of light reflecting surfaces 23 and the plurality of light reflecting surfaces 24 is expanded in the second direction. Thereby, the distance between the reflective surface 21 and the optical part 30 can be lengthened, for example. For example, the optical unit 30 can be disposed at a position away from the center of the user's field of view, and usability is improved.

(Second Embodiment)
FIG. 15 is a schematic view illustrating a display device according to the second embodiment.
A display device 120 illustrated in FIG. 15 includes a display unit 10, an optical unit 30, and a reflection unit 50. The same description as in the first embodiment can be applied to the display unit 10 and the optical unit 30.

  The display device 120 may not include the processing unit 40 that performs image processing. The display unit 10 emits image light according to the target image input to the display device 120. For example, the first pixel 11 emits the first light L1.

  The reflection unit 50 includes a holding unit 57 and a plurality of reflection surfaces 51. The holding unit 57 is the same as the holding unit 27 described in regard to the first embodiment.

  The plurality of reflecting surfaces 51 have different reflectances with respect to image light. Other than this, the plurality of reflecting surfaces 51 are the same as the plurality of reflecting surfaces 21 described in regard to the first embodiment. For example, the plurality of reflection surfaces 51 include first to fourth reflection surfaces 51a to 51d. The first to fourth reflecting surfaces 51a to 51d correspond to the first to fourth reflecting surfaces 21a to 21d shown in FIG. When the incident angles are the same, the reflectance of the first reflecting surface 51a for the first light L1 is lower than the reflectance of the second reflecting surface 51b for the first light L1.

  In this example, the reflectance of the first reflecting surface 51a with respect to the first light L1 is 20%, the reflectance of the second reflecting surface 51b with respect to the first light L1 is 25%, and the first reflecting surface 51c has the first reflectance. The reflectance with respect to the light L1 is 33%, and the reflectance with respect to the first light L1 of the fourth reflecting surface 51d is 50%. As a result, 20% of the first light L1 emitted from the display unit 10 is reflected by each reflecting surface 51.

  Thus, the reflection characteristics of the reflection surface 51 are changed for each reflection surface. The reflection surface 51 closer to the optical unit 30 decreases the reflectance and increases the transmittance. As a result, unevenness in luminance occurring in the virtual image is suppressed.

  For example, the amount of light reaching the pupil 201 from the reflective surface 51 close to the optical unit 30 is reduced by reducing the reflectance of the reflective surface 51 close to the optical unit 30. Thereby, the brightness | luminance of the virtual image which the light reflected by the reflective surface 51 near the optical part 30 forms falls.

  Increasing the transmittance of the reflective surface 51 close to the optical unit 30 increases the amount of light reaching the reflective surface 51 far from the optical unit 30. Thereby, the brightness | luminance of the virtual image which the light reflected by the reflective surface 51 far from the optical part 30 forms increases. In this way, uneven brightness caused by reflection and transmission is suppressed.

  In the present embodiment, the processing unit 40 may be provided as in the first embodiment. In the processing unit 40, it is possible to further suppress the uneven brightness by performing image processing so that the uneven brightness of the virtual image is suppressed.

  Also in this embodiment, the reflectance of the reflecting surface 51 may have a dependency on the incident direction (incident angle) of light. Similar to the first embodiment, the higher the incident angle, the higher the reflectance. For example, the reflectance of the first reflecting surface 51a for the first light L1 is made higher than the reflectance of the first reflecting surface 51a for the second light L2.

  Similar to the example of FIG. 5, the distance between the adjacent reflecting surfaces 51 may be increased as the distance from the optical unit 30 increases. Thereby, unevenness in luminance can be suppressed and an easy-to-see display can be obtained. In addition, each element of the specific example described in the first embodiment can be combined with the display device 120 according to the present embodiment.

FIG. 16 is a schematic view illustrating another display device according to the second embodiment.
The display device 121 illustrated in FIG. 16 includes a display unit 10a, a reflection unit 50, and an optical unit 30.
The display unit 10a emits image light in the same manner as the display unit 10 described above. The image light emitted from the display unit 10a is polarized light. Other than this, the display unit 10 a is the same as the display unit 10.
In this example, the image light emitted from the display unit 10a includes light that vibrates in the first vibration direction (hereinafter referred to as S wave) and light that vibrates in the second vibration direction (hereinafter referred to as P wave). Including. For example, in the light emitted from the first pixel 11, the proportion of the S wave is 50% and the proportion of the P wave is 50%.

  The plurality of reflection surfaces 51 (first to fourth reflection surfaces 51a to 51d) included in the reflection unit 50 have different reflectances from polarized light (image light) emitted from the display unit 10a. The reflectance is determined so that the amount of image light reflected by the first reflecting surface 51a to the pupil and the amount of image light reflected by the second reflecting surface 51b to the pupil are equal. In this example, in each reflecting surface 51, the reflectance for the S wave is different from the reflectance for the P wave.

  For example, the reflectance with respect to the S wave of the first reflecting surface 51a is 20%, and the reflectance with respect to the P wave of the first reflecting surface 51a is 0%. For example, the reflectance with respect to the S wave of the second reflecting surface 51b is 0%, and the reflectance with respect to the P wave of the second reflecting surface 51b is 20%. For example, the reflectance of the third reflecting surface 51c with respect to the S wave is 40%, and the reflectance of the third reflecting surface 51c with respect to the P wave is 0%. For example, the reflectance with respect to the S wave of the fourth reflecting surface 51d is 0%, and the reflectance with respect to the P wave of the fourth reflecting surface 51d is 40%.

  As described above, in the example of FIG. 16, the reflection surface that reflects only the P wave and the reflection surface that reflects only the S wave are alternately arranged. Accordingly, 10% of the first light L1 emitted from the display unit 10a is reflected on each reflecting surface 51. By changing the reflection characteristic of the reflecting surface 51 with respect to the polarized light for each reflecting surface, it is possible to suppress unevenness in luminance that occurs in the virtual image.

  Furthermore, the transmittance of the plurality of reflecting surfaces 51 with respect to the external light L0 is, for example, the same. The external light L0 is light that enters the reflection unit 50 from the outside of the display device 121. The external light L0 is non-polarized light (random polarized light), for example, natural light. In this example, the transmittance of the first reflecting surface 51a for non-polarized light is equal to the transmittance of the second reflecting surface 51b for non-polarized light. Thereby, when the position of a pupil changes, the change of the light quantity of the external light L0 which injects into a pupil can be suppressed. It becomes easier for the user to see the outside world through the reflecting portion 50.

(Relationship between image processing and reflectance of reflecting surface)
The relationship between the image processing performed in each of the above embodiments and the reflectance of the reflecting surface 21 will be described. In the dielectric multilayer film used for the reflecting surface 21, the reflectance may vary depending on the incident angle of light. This effect is also considered below.

  In this description, the arrangement of the reflecting surface 21 is the same as that described with reference to FIG. It is assumed that light (image light) that is reflected by the reflecting surface 21 close to the optical unit 30 and reaches the pupil is light having a large incident angle with respect to the reflecting surface 21. The light having a large incident angle is, for example, the first light L1. Furthermore, it is assumed that the light that is reflected by the reflecting surface 21 far from the optical unit 30 and reaches the pupil is light having a small incident angle with respect to the reflecting surface 21. The light having a small incident angle is, for example, the second light L2.

(1. When the material of all reflective surfaces is the same)
First, the case where the material of all the reflective surfaces 21 is the same is demonstrated. In this case, the reflectances of the plurality of reflecting surfaces 21 are substantially the same.

(1-1. The smaller the incident angle, the lower the reflectance)
Depending on the material of the reflecting surface 21, the reflectance of the reflecting surface 21 may be lower as the incident angle of light with respect to the reflecting surface 21 is smaller. In this case, image processing is performed so that the brightness of light having a large incident angle with respect to the reflection surface 61 (for example, the first light L1) is low. As already described, light having a large incident angle, such as the first light L <b> 1, reaches the pupil 201 from the reflecting surface 21 near the optical unit 30 among the plurality of reflecting surfaces 21. For this reason, light reaching the pupil 201 out of light having a large incident angle with respect to the reflecting surface 21 has a small number of transmissions. Therefore, it reaches the pupil 201 in a state where the decrease in luminance is small. When the number of transmissions increases, light having a large incident angle is reflected by the reflecting surface 21 far from the optical unit 30 and goes out of the eye range. For this reason, even if the brightness | luminance of light with a large incident angle falls by many times of transmission, the influence which the virtual image which a user sees receives is small. As described above, when the luminance (light quantity) of light having a large incident angle with respect to the reflecting surface 21 is reduced, the luminance of the high-luminance pixel is reduced and the luminance gradient of the virtual image is suppressed.

(1-2. The smaller the incident angle, the higher the reflectance)
Depending on the material of the reflecting surface 21, the reflectance of the reflecting surface 21 may be higher as the incident angle of light with respect to the reflecting surface 21 is smaller. In this case, there are two types of correction processing in the processing unit 40: correction that increases the luminance value of the first pixel 11 and correction that decreases the luminance value of the first pixel 11. Alternatively, there may be a case where the correction in the processing unit 40 is not necessary.

  When the increase in the reflectance with respect to the decrease in the incident angle is small (first case), the luminance of the light reaching the pupil 201 in the first light L1 is the intensity of the light reaching the pupil 201 in the second light L2. Higher than brightness. This is due to the difference in the number of times light passes through the reflecting surface 21. In this case, image processing is performed so that the luminance of light (first light L1) having a large incident angle with respect to the reflecting surface 21 is lowered.

  When the increase in the reflectance with respect to the decrease in the incident angle is large (second case), the luminance of the light reaching the pupil 201 in the second light L2 is the light intensity of the light reaching the pupil 201 in the first light L1. May be higher than brightness. In this case, image processing is performed so that the luminance of light having a large incident angle with respect to the reflecting surface 21 is increased. In the intermediate state between the first case and the second case, the target image may not be corrected.

(1-3. When the reflectance does not depend on the incident angle)
When the reflectance does not depend on the incident angle of the light with respect to the reflecting surface 21, the image processing is performed so that the luminance of the light that is transmitted through the reflecting surface 21 is small (that is, light having a large incident angle).

(2. When the material is different for each reflective surface)
The material of the reflecting surface may be different for each reflecting surface 21. In this case, like the reflective surface 51 of the second embodiment, the reflectance of the reflective surface 21 is different for each reflective surface. In this case, image processing is performed as necessary.

It is assumed that one pixel Px1 (not shown) in the original target image is corrected to generate a pixel Px2 (not shown) in the processed image. It is assumed that the pixel Px3 (not shown) of the display unit 10 emits light Lα according to the pixel Px2. At this time, the incident angle of the light Lα with respect to the reflecting surface 21 is α, the reflectance of the nth reflecting surface 21 with respect to the incident angle α is f (n, α), and the luminance of the light emitted from the optical unit 30 is If l, the luminance L of the light projected from the Nth reflecting surface 21 onto the pupil 201 is
L = l · f (N, α) · Π N n-1 (1-f (n, α))
It is expressed. Note that n and N are each a natural number of 1 or more.

  When the luminance distribution in the original target image is uniform, it is desirable that the luminance L of the light reaching the pupil 201 does not depend on the pixel position. As an example, a case where the reflectance does not depend on the incident angle will be described. When the reflection characteristics of the plurality of reflecting surfaces 21 are the same, L is large when N is large, and L is small when N is small. When the incident angle α is large, the light Lα is reflected by the reflecting surface 21 close to the optical unit 30 and reaches the pupil 201, so that N is relatively small. When the incident angle α is small, the light Lα is reflected by the reflecting surface 21 far from the optical unit 30 and reaches the pupil 201, so that N is relatively large. That is, when α is large, the luminance of the light Lα reaching the pupil 201 tends to be large, and when α is small, the luminance of the light Lα reaching the pupil 201 tends to be small.

  Therefore, for example, the correction is performed so that the luminance value of the pixel Px2 in the processed image becomes larger with respect to the luminance value of the pixel Px1 in the target image as α is smaller. For example, the correction is performed so that the luminance value of the pixel Px2 with respect to the luminance value of the pixel Px1 decreases as α increases. That is, l is increased as α is decreased, and l is decreased as α is increased. Thereby, uneven brightness can be suppressed. Similarly, when the reflection characteristics are different for each reflection surface, the target image is corrected so that the luminance L does not depend on the pixel position. Thereby, uneven brightness can be suppressed.

FIG. 17 is a block diagram illustrating a display device according to the embodiment.
FIG. 17 illustrates an example of a display device system according to the embodiment.
As illustrated in FIG. 17, the processing unit 40 (circuit unit) includes, for example, an interface 42 (acquisition unit), a processing circuit (processor) 43, and a memory 44.

  For example, the processing unit 40 is connected to an external storage medium or network via the interface 42, and acquires an input image (target image). For connection to the outside, either a wired or wireless method may be used. The acquisition unit may be an input / output terminal, for example.

  In the memory 44, for example, a program 45 for processing the acquired target image is stored. For example, the target image is appropriately converted based on the program 45, and accordingly, appropriate display is performed on the display unit 10. In the memory 44, image information may be held. The program 45 may be provided in a state stored in the memory 44 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 processing unit 40 may include a sensor 46. For the sensor 46, for example, an arbitrary sensor such as a camera, a microphone, a position sensor, or an acceleration sensor can be used. For example, the sensor 46 is a sensor that measures the position of the pupil 201 described above. Based on information obtained from the sensor 46, the image displayed on the display unit 10 is appropriately changed. Thereby, the convenience and visibility of the image display device can be improved. For example, in the processing circuit 43, information obtained from the sensor 46, image information, and the like are processed based on the program 45. The image information thus obtained is input from the processing unit 40 to the display unit 10 and displayed on the display device.

  An integrated circuit such as an LSI (Large Scale Integration) or an IC (Integrated Circuit) chip set can be used for a part or all of each block of the processing unit 40 (image processing apparatus). 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. 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.

  As above, the display device and the image processing device have been described as embodiments. However, the embodiment may be in the form of a program that causes a computer to execute processing in the image processing apparatus, or 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. An image processing program for causing a computer to execute the processing of the image processing apparatus 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 a display unit, a reflection unit, an optical unit, a processing unit, a holding unit, and a reflection surface, a person skilled in the art appropriately implements the present invention by appropriately selecting from a known range. As long as the same 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, 10a ... Display part, 10e ... Pixel, 11 ... 1st pixel, 12 ... 2nd pixel, 20, 20a, 20b ... Reflecting part, 21 ... Reflecting surface, 21a-21d ... First to fourth reflecting surface, 22 , 22a to 22d ... reflective surface, 23, 23a, 23b, 24, 24a, 24b ... light reflective surface, 27 ... holding portion, 27a-27c ... first to third surfaces, 30 ... optical portion, 31 ... lens, 31a ... 1st part, 31b ... 2nd part, 31x ... Optical axis, 32 ... Optical element, 32a ... 1st part, 32b ... 2nd part, 40 ... Processing part, 42 ... Interface, 43 ... Processing circuit, 44 ... Memory 45 ... program, 46 ... sensor, 50 ... reflecting part, 51 ... reflecting surface, 51a to 51d ... first to fourth reflecting surfaces, 57 ... holding part, θ1 ... angle, θ1a, θ1b ... incident angle, θ2 ... angle , Θ2a, θ2b ... incidence angle, θa-θd ... angle, 100-107, 101b, 120, 121 ... display device, 200 ... user, 201 ... pupil, 210 ... image (virtual image), A, B, C, D ... position, A1 ... region, D1 ... first direction, D2 ... second direction, DL1-DL3 ... direction, Da1, Da2 ... extending direction, Db1 ... first extending direction, Db2 ... second extending direction, De ... Gaze direction, Din ... Incident direction, Dref ... Reflection direction, Ds1-Ds6 ... Distance, Dv ... Direction, E1, E2 ... End, E2 ... End, E21 ... End, ER ... Eye range, Ea ... First End, Eb ... second end, F1 ... first light flux, F1a to F1c ... light flux, F2 ... second light flux, F2a-F2c ... light flux, G1 ... gap, L0 ... external light, L1 ... first light, L11, L12 , L1a, L1 ... light, L2 ... second light, L2a, L2b ... light, Le1 ... light beam, Le ... image light, Ln ... distance, Lp1, Lp2, Lq1, Lq2, Lr1, Lr2, Ls, Lsa ... light, M1 ... target image , M2 ... processed image, Ra, Rb ... region, R1 ... first region, R2 ... second region, Sa1, Sa2 ... side, Sb1 ... first side, Sb2 ... second side, V1, V2 ... change, W1, W2 ... Width

Claims (19)

A display unit that emits image light based on a target image including a first region and a second region, the first pixel corresponding to the first region, and the second pixel corresponding to the second region, Including the display unit;
A reflective portion that includes a first reflective surface and a second reflective surface along the first reflective surface and reflects the image light;
An optical unit provided between the reflection unit and the display unit on the optical path of the image light;
With
The image light includes first light emitted from the first pixel and second light emitted from the second pixel,
The first light and the second light are incident on the first reflecting surface;
The first reflecting surface reflects a part of the first light and transmits another part of the first light;
The second reflecting surface reflects the other part that has passed through the first reflecting surface,
The incident angle of the first light with respect to the first reflecting surface is larger than the incident angle of the second light with respect to the first reflecting surface,
When the brightness of the second region is equal to the brightness of the first region, the second light is brighter than the first light between the display unit and the reflection unit. A processing unit that corrects the target image to generate a processed image;
The processed image includes a first post-process area corresponding to the first area and a second post-process area corresponding to the second area;
The first pixel emits the first light according to the first processed region,
The second pixel emits the second light according to the second post-processing region,
The display device according to claim 1, wherein when the brightness of the second area is equal to the brightness of the first area, the second post-process area is brighter than the first post-process area.   The display device according to claim 1, wherein the first reflecting surface is parallel to the second reflecting surface.   The display device according to claim 2, wherein the processing unit adjusts a luminance distribution in the processed image according to a position of a user's eyeball with respect to the reflecting unit. The reflective portion includes a plurality of reflective surfaces,
The plurality of reflective surfaces include the first reflective surface, the second reflective surface, and a third reflective surface,
The second reflective surface is provided between the third reflective surface and the display unit,
The first reflective surface is provided between the second reflective surface and the display unit,
The reflective surface closest to the second reflective surface among the multiple reflective surfaces is the first reflective surface,
The display device according to any one of claims 1 to 4, wherein a reflective surface closest to the third reflective surface among the plurality of reflective surfaces is the second reflective surface.   The display device according to claim 1, wherein a reflectance of the first reflecting surface with respect to the first light is different from a reflectance of the second reflecting surface with respect to the first light.   The display device according to claim 1, wherein a reflectance of the first reflecting surface with respect to the first light is higher than a reflectance of the first reflecting surface with respect to the second light. The first light is polarized light;
The display device according to claim 6, wherein a transmittance of the first reflecting surface with respect to non-polarized light is equal to a transmittance of the second reflecting surface with respect to the non-polarized light. The reflective portion further includes a holding portion that transmits the image light and holds the first reflective surface;
The holding portion has a first surface and a second surface that are separated from each other in a second direction that intersects a first direction that connects the first reflective surface and the second reflective surface;
The display device according to claim 1, wherein the first reflecting surface is provided between the first surface and the second surface.   The display device according to claim 9, wherein the first light is not totally reflected by the holding unit. The optical unit includes an optical element that causes the image light to enter the holding unit,
The display device according to claim 9, wherein a width of the optical element along the second direction is wider than a width of the holding unit along the second direction.   The display device according to claim 9, wherein the holding unit is separated from the optical unit.   The display device according to claim 9, wherein the first reflecting surface and the second reflecting surface are separated from the first surface and separated from the second surface. The optical unit includes a decentered lens including a first part and a second part thicker than the first part,
The first light passes through the first part and enters the holding unit, and is emitted from the holding unit on the second surface.
The second light passes through the second part and enters the holding unit, and is emitted from the holding unit on the second surface,
The display device according to claim 9, wherein a distance between the first reflecting surface and the second surface is shorter than a distance between the first reflecting surface and the first surface. .   The display device according to claim 1, wherein the incident angle of the first light with respect to the second reflecting surface is larger than the incident angle of the first light with respect to the first reflecting surface. The reflection part further includes a fourth reflection surface,
The display device according to claim 1, wherein the another part of the first light reflected by the second reflecting surface is transmitted through the fourth reflecting surface. The optical unit includes a lens including a first portion including a first end through which the first light passes, and a second portion including a second end through which the second light passes.
The distance between the second end along the direction perpendicular to the optical axis of the lens and the first reflecting surface is the distance between the second end along the perpendicular direction and the second reflecting surface. The display device according to claim 1, wherein the display device is longer than a distance between them. The first reflecting surface includes a first side along a first extending direction and a second side along a second extending direction intersecting the first extending direction,
The first extending direction is inclined with respect to a direction connecting the center of the first reflecting surface and the center of the second reflecting surface;
The display device according to claim 1, wherein the second extending direction is inclined with respect to the connecting direction. The reflective portion is
A first light reflecting surface provided between the first reflecting surface and the optical unit on at least a part of the optical path of the first light;
A second light reflecting surface parallel to the first light reflecting surface;
A third light reflecting surface provided between the first reflecting surface and the optical unit on at least a part of the optical path of the second light;
A fourth light reflecting surface parallel to the third light reflecting surface;
Including
The display device according to claim 1, wherein an angle between the first light reflection surface and the third light reflection surface is 90 degrees.

Images