JP2011118402A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a head mount type display device arranged in front of an eye of an observer. <P>SOLUTION: The display device includes: a first concave mirror 53 formed as a part of a first elliptical body 51 having first and second focal points, through which light emitted from a display element 55 and passing through an image forming element 56 passes; and a second concave mirror 54 formed as a part of a second elliptical body 52 having a third focal point, arranged at a position common to the second focal point, and a fourth focal point; wherein the light emitted from the display element is focused on or near the first focal point, the light passing through the first focal point is reflected by the first concave mirror and proceeds toward the common second and third focal points, the light passing through the second and third focal points is reflected by the second concave mirror to be focused on or near the fourth focal point, and thereby the eye of the observer can be arranged on or near the fourth focal point. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device called a head-mounted display or an eyeglass-type display in which an image of a display element such as a liquid crystal display element is viewed immediately in front of an observer.

  This type of display device includes, for example, JP-A-5-134208 (Patent Document 1), JP-A-5-210069, JP-A-5-328261, JP-A-7-46513, JP-A-9-189880, No. 11-64781, and Japanese Patent No. 2910111. Further, display devices including a light guide are disclosed in Japanese Patent Application Laid-Open Nos. 2-297516, 5-304645, and 9-73043.

  This type of display device includes a display element such as a liquid crystal panel and an imaging element such as a convex lens or a concave mirror for enlarging an image formed by the display element. FIG. 14 of the accompanying drawings is a diagram showing an optical system of a conventional glasses-type display. In FIG. 14, 1 is a display element, 2 is an imaging element, 3 is a virtual image of the display element 1 magnified by the imaging element 2, and 4 is a pupil of an observer. Diffused light is irradiated onto the display element 1, and the light passing through the display element 1 enters the observer's pupil 4 through the imaging element 2. Therefore, the observer can see the virtual image 3 of the display element 1 magnified by the imaging element 2. A diffusion surface 1a for generating scattered light is disposed on the incident light source side of the display element.

In this case, a fluorescent tube is used as the light source. However, since the fluorescent tube is large and heavy, it is difficult to use the fluorescent tube for an eyeglass-type display disposed immediately in front of the observer's eyes.
FIG. 15 shows an example using the light emitting element 6 which is a substantial point light source. The light emitting element 6 emits divergent light, and the divergent light passing through the display element 1 enters the observer's pupil 4 through the imaging element 2 as convergent light. In this case, since the divergent light is irradiated to the display element 1, the imaging element 2 needs to be disposed at a position close to the display element 1. However, since the imaging element 2 is arranged at a position close to the display element 1, the aberration increases and the quality of the image decreases. For this reason, as shown in FIG. 16, it is necessary to provide a plurality of imaging elements 2 and 2a in order to improve display quality. Therefore, there is a problem that the entire display device becomes large and heavy.

  Japanese Laid-Open Patent Publication No. 5-134208 proposes to use an ellipsoid having two focal points in order to reduce the size of the display device. That is, as shown in FIG. 17, a concave mirror 8 is formed using a part of the ellipsoid 7, and the light passing through the display element 1 and the eccentric lens group 2x passes through the first focal point P1 of the ellipsoid 7. The light reflected by the concave mirror 8 passes through the second focal point P2, and the observer's pupil 4 is arranged at the second focal point P2. In this way, the light passing through the first focal point is reflected by the concave mirror 8 and surely passes through the second focal point and enters the pupil 4.

  However, in the display device shown in FIG. 17, when the observer wears the display device, the display element 1 and the eccentric lens group 2x are positioned beside the observer's pupil 4 and There is a possibility of interference with a nearby part. For this reason, the display device needs to be configured so that the display element 1 and the eccentric lens group 2x do not interfere with the temporal region of the observer, and the display device cannot be made sufficiently small.

  Further, the configuration using the two focal points of the ellipsoid 7 tends to distort the display screen. That is, the angle of the light diverging from the first focal point P1 is not the same as the angle of the light condensed at the second focal point P2. Therefore, in order to make the angle of light incident on the pupil 4 equal to the angle of light passing through the display element 1, a plurality of complicated eccentric lenses must be arranged as the eccentric lens group 2x in the vicinity of the display element 1. Don't be. For this reason, there exists a problem that a display apparatus cannot fully be reduced in size.

Japanese Patent Laid-Open No. 5-134208 JP-A-5-210069 JP-A-5-328261 JP 7-46513 A Japanese Patent Laid-Open No. 9-189880 Japanese Patent Laid-Open No. 11-64781 Japanese Patent No. 2910111 JP-A-2-297516 JP-A-5-304645 JP-A-9-73043

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device that can be miniaturized and that allows an image to be viewed in front of an observer's eyes.
It is a further object of the present invention to provide a display device that can be viewed in front of the viewer's eyes and can be configured not to interfere with the temporal region of the viewer.

  A display device according to the present invention includes a display element, an imaging element, and a first ellipsoid having a first focal point and a second focal point through which light emitted from the display device and passed through the imaging element passes. A first concave mirror formed as a part and a second ellipsoid formed as a part of a second ellipsoid having a third focus and a fourth focus disposed at the same position as the second focus. A concave mirror, and the light emitted from the display element is collected in the vicinity of the first focal point, and the light passing through the first focal point is reflected by the first concave mirror to be a common second And the light passing through the second and third focal points or the equivalent light is reflected by the second concave mirror and collected near the fourth focal point for observation. Viewing the display formed in front of the viewer's eyes so that the viewer's eyes are positioned near the fourth focus And said that it has cut way.

  According to this configuration, the first concave mirror and the second concave mirror are formed using the first ellipsoid and the second ellipsoid in which the second focal point and the third focal point are arranged at a common position. Thus, more preferably, the symmetry of the optical system can be improved by using the first ellipsoid and the second ellipsoid as equivalent spheroids. Therefore, it is not necessary to use a plurality of complicated eccentric lenses as in the conventional case, and the entire apparatus can be made small and light.

Furthermore, the present invention provides a display device that combines the above two features.
Furthermore, a display device according to the present invention is a display device disposed in front of the eyes of an observer, and includes a display element, an imaging element that collects light emitted from the display element, and the imaging element. A light guide having an incident surface on which light passing therethrough and a concave mirror provided on the light guide so as to receive the light passing through the light guide, the concave mirror having a first focus and a second The light is formed as a part of an ellipsoid having a focal point, and the light passing through the imaging element is reflected a plurality of times inside the light guide so that the light is incident on the concave mirror from the second focal point P2. The light incident on the concave mirror and reflected by the concave mirror is condensed at or near the first focal point and is incident on the eyes of the observer.

  According to this configuration, a small and simple display device can be obtained. In this case, the light guide has a pair of opposed flat surfaces and an inclined surface inclined with respect to the flat surface, and the light passing through the imaging element is condensed on the inclined surface, Preferably, the light is reflected by the pair of opposed flat surfaces. Preferably, the incident surface is the inclined surface, or the incident surface is a part of the flat surface so that light incident from the incident surface is reflected by the inclined surface.

  Furthermore, the display device according to the present invention is a display device arranged in front of the eyes of an observer, and is an optical device that makes the display element and the light applied to the display element or the light passing through the display element substantially parallel light. And a concave mirror on which light passing through the optical element is incident. The concave mirror is formed as a part of a rotating paraboloid, and the light reflected by the concave mirror is at or at the focal point of the rotating paraboloid. The light is condensed in the vicinity and is incident on the eyes of the observer.

  According to this configuration, a small and simple display device can be obtained. In this case, the optical element preferably consists of a further concave mirror formed as part of the paraboloid of revolution. The concave mirror and the further concave mirror are preferably provided in a light guide.

  As described above, according to the present invention, a display device that is small and can be manufactured at low cost can be obtained. Further, according to the present invention, it is possible to realize an ultra-small display device that can be mounted on the head.

FIG. 4 is a diagram illustrating a first example of an optical system of the display device of FIG. 3. It is a figure which shows the modification of the optical system of FIG. It is a perspective view which shows the display apparatus seen in front of the observer's eyes concerning this invention. It is a figure explaining the effect | action of the optical system of FIG.1 and FIG.2. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the optical system applied to the display apparatus with a see-through function. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the example of the optical system provided with the function to adjust the position of the light emission point of a light emitting element. It is a figure which shows the optical system of FIG. 12 in another state. It is a figure which shows the optical system of the conventional spectacles type display. It is a figure which shows another prior art example. It is a figure which shows another prior art example. It is a figure which shows the other prior art example which has the optical system formed based on the ellipsoid. It is a figure which shows 2nd Example of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the light guide of FIG. It is a figure which shows the modification of the light guide of FIG. It is a figure which shows the modification of the light guide of FIG. It is a figure which shows the 1st ellipsoid and 2nd ellipsoid of the display apparatus demonstrated with reference to FIGS. It is a figure which shows the 1st ellipsoid and 2nd ellipsoid arrange | positioned three-dimensionally. It is a figure which shows the display apparatus containing the optical system of FIG. It is a figure which shows the example of the optical system which added the seal through function. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the modification of the optical system of FIG. It is a figure which shows the further modification of the optical system of this invention. It is a figure which shows the further modification of the optical system of this invention. It is a figure which shows the further modification of the optical system of this invention. It is a figure which shows the further Example of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of FIG. It is an enlarged view which shows a part of light guide of FIG. It is a figure which shows the further Example of the optical system of the display apparatus of FIG. It is a figure which shows the example of arrangement | positioning of the 1st and 2nd reflective mirror of FIG. It is a figure which shows the example of arrangement | positioning of the 1st and 2nd reflective mirror of FIG. FIG. 36 is a diagram showing a modification of the optical system of the display device in FIG. 35. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. It is a figure which shows the modification of the optical system of the display apparatus of FIG. FIG. 45 is a diagram showing a modification of the optical system of the display device of FIG. 44.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows a display device 10 called a head-mounted display or eyeglass-type display that is seen in front of the observer's eyes according to the present invention. The display device 10 is a glasses-type display device worn on the face of the observer 12. The display device 10 has a glasses-like main body structure for mounting the display device 10 on the face of the observer 12 and an optical system incorporated in the main body structure. In the example, the main body structure of the display device is shown as glasses or goggles. However, the present invention is not limited to a display device having a main body structure of glasses or goggles. As the main body structure of the display device, for example, various structures such as a belt surrounding the head, a structure such as a helmet and a kachchasha, an ear hook type, and a clip attached to glasses can be adopted.

  FIG. 1 is a diagram showing a first embodiment of the optical system 14 of the display device 10 of FIG. The optical system 14 includes a light emitting element 16, a transmissive display element 18 that is illuminated by the light emitting element 16, and an imaging element 20 that passes light that has passed through the display element 18. Further, the optical element 22 is disposed between the light emitting element 16 and the display element 18. 24 is the pupil of the observer 12.

  The light emitting element 16 is a substantial point light source and is disposed in a minute opening of the mask 26. The display element 18 can be any type of display that forms an image in response to an electrical signal. The imaging element 20 and the optical element 22 are both configured by convex lenses. The light emitting element 16 is disposed at the focal point of the optical element 22, so that divergent light emitted from the light emitting element 16 enters the display element 18 as parallel light.

  The imaging element 20 has a first focal point 20 a on one side of the imaging element 20 and a second focal point 20 b on the other side of the imaging element 20. F is the focal length of the imaging element 20. The display element 18 is disposed between the imaging element 20 and the first focal point 20a of the imaging element 20 at a position close to the first focal point 20a. Therefore, a virtual image of the display element 18 is formed by the imaging element 20. Further, the light emitted from the light emitting element 16 is condensed at the second focal point 20b of the imaging element 20. That is, an image of the light emitting element 16 is formed at the second focal point 20 b of the imaging element 20.

In the display device 10, the second focus 20 b of the imaging element 20 is positioned at the pupil 24 when the display device 10 is attached to the face of the observer 12. For this reason, the condensing light is most focused on the pupil 24 of the observer 12.
FIG. 2 is a diagram showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 2 includes the same members as the optical system 14 in FIG. 1, and the operation of the optical system 14 in FIG. 2 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 2, the light emitting element 16 is composed of a light emitting diode which is a point light source, and the display element 18 is composed of a liquid crystal panel sandwiched between polarizers 18a and 18b. The optical element 22 is disposed closer to the display element 18 than the first focal point 20a of the imaging element 20. Therefore, the optical system 14 of FIG. 2 can be shorter than the optical system 14 of FIG.

  FIG. 4 is a diagram for explaining the operation of the optical system 14 shown in FIGS. As described above, parallel light is incident on the display element 18, and the display element 18 is disposed between the imaging element 20 and the first focal point 20a of the imaging element 20 at a position close to the first focal point 20a. Is done. Since the display element 18 is disposed between the imaging element 20 and the first focal point 20 a of the imaging element 20, a virtual image 28 of the display element 18 is formed by the imaging element 20. The display element 18 is disposed at a position close to the first focal point 20a of the imaging element 20 under the condition that a virtual image 28 can be formed. In other words, the display element 18 is arranged away from the imaging element 20 so that the image quality is not deteriorated due to a decrease in resolution. Preferably, the display element 18 is arranged at a position away from the imaging element 20 by half or more of the focal length of the imaging element 20. In the embodiment, the focal length of the imaging element 20 is 22 mm, and the display element 18 is disposed at a position 12 mm from the imaging element 20.

  The image of the light emitting element 16 is formed at the second focal point 20 b of the imaging element 20, and the second focal point 20 b of the imaging element 20 is positioned at the pupil 24 when the display device 10 is mounted on the face of the observer 12. It is supposed to be. For this reason, the condensed light is focused most on the pupil 24 of the observer 12, and the observer 12 sees the display through the pinhole provided in the wall 30.

  When a human eye is seen as a camera, if there is a pinhole on the pupil 24, a close image can be seen well on the same principle as a pinhole camera. In the present invention, a virtual pinhole is optically formed instead of physically forming a pinhole. By arranging the display element 18 in the vicinity of the first focal point 20a of the imaging element 20, the observer 12 can see the virtual image 28 of the display element 18 as well as a pinhole camera. Normally, it is difficult to see a virtual image near the observer's eyes, but by applying the principle of the pinhole camera, it becomes a long focal depth, and it is possible to see a virtual image even if the distance from the eye to the virtual image is not so far. it can. On the other hand, as described with reference to FIG. 14, when the light is incident on the pupil with a width that is not narrowed down, the virtual image cannot be seen well unless the distance from the eye to the virtual image is so far away. Usually, the optical system is configured so that a larger virtual image is formed at a position farther from the pupil. By configuring the present invention as described above, the optical system can be further miniaturized and manufactured at low cost.

  FIG. 5 is a view showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 5 includes the same members as the optical system 14 in FIG. 1, and the operation of the optical system 14 in FIG. 5 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 5, the display element 18 is formed of a reflective display element, and a half mirror 32 as a light separating unit that transmits a part of light and reflects the remaining part of the light includes a light emitting element 16, a display element 18, and It is arranged between. A part of the divergent light emitted from the light emitting element 16 is reflected by the half mirror 32, passes through the imaging element 20, and irradiates the display element 18. The light reflected by the display element 18 passes through the imaging element 20 and the half mirror 32 and travels toward the pupil 24 of the observer 12.

  When the light travels from the light emitting element 16 to the display element 18 through the half mirror 32, the diverging light is converted into parallel light by the imaging element 20, so that the imaging element 20 functions as the optical element 22 in FIG. Including. In other words, the optical element 22 and the imaging element 20 are made of a common element. When the light travels from the half mirror 32 to the pupil 24, an image of the light emitting element 16 is formed at the second focal point 20b of the imaging element 20.

  FIG. 6 is a view showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 6 includes the same members as the optical system 14 in FIG. 5, and the operation of the optical system 14 in FIG. 6 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 6, the display element 18 is formed as a liquid crystal panel, and polarizers 18 a and 18 b are disposed on the incident side and the emission side of the display element 18. The polarizer 18 a is disposed between the light emitting element 16 and the half mirror 32, and the polarizer 18 b is disposed between the half mirror 32 and the pupil 24.

FIG. 7 is a view showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 7 includes the same members as the optical system 14 in FIG. 6, and the operation of the optical system 14 in FIG. 7 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 7, the polarizer 18 a is disposed between the light emitting element 16 and the half mirror 32, and the polarizer 18 b is bonded to the half mirror 32.
FIG. 8 is a view showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 8 includes the same members as the optical system 14 in FIG. 6, and the operation of the optical system 14 in FIG. 8 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 8, the polarizer 18 a is disposed on the light incident surface side of the display element 18. This example can be applied to the case of a display element 18 that can display with a reflective liquid crystal panel and one polarizer, such as a ferroelectric liquid crystal.

  FIG. 9 is a view showing a modification of the optical system 14 of FIG. The optical system 14 in FIG. 9 includes the same members as the optical system 14 in FIG. 5, and the operation of the optical system 14 in FIG. 9 is substantially the same as the operation of the optical system 14 in FIG. In FIG. 9, a polarization beam splitter 34 is arranged instead of the half mirror 32 of FIG. The polarizing beam splitter 34 functions as a light separating means that transmits one polarized light and reflects the other polarized light. If the polarizing beam splitter 34 is used, the polarizers 18a and 18b in FIGS. 6 to 8 can be omitted, and the loss of light quantity can be reduced. In place of the polarizing beam splitter 34, a film that reflects specific polarized light (for example, DBEF or HMF manufactured by 3M) may be used.

  FIG. 10 is a diagram showing an optical system 14 applied to a display device having a see-through function. The light from the light emitting element 16 is directly incident on the imaging element 20 and the display element 18, and the light reflected by the display element 18 is reflected by the half mirror 36 and is incident on the pupil 24 of the observer 12. External light 38 passes through the half mirror 36 and enters the pupil 24 of the observer 12. Therefore, the observer 12 can see the outside (for example, a computer keyboard) through the half mirror 36 together with the display image. Although one polarizer 18a is arranged in front of the display element 18, the polarizer can be arranged in the vicinity of the light emitting element and the half mirror 36 as necessary. When the light in the external environment is dazzling, a light control panel (liquid crystal panel or the like) can be disposed outside the half mirror 36. In this way, a combiner that combines light from the outside and light from the display element 18 can be configured.

  FIG. 11 is a view showing a modification of the optical system of FIG. In this example, the optical system includes a light guide plate 40 made of transparent plastic, and a polarizing beam splitter 34 is formed in the middle of the light guide plate 40. The light emitting element 16 is disposed at one end of the light guide plate 40, and the other end of the light guide plate 40 is bent at a right angle to form a prism 40a. The light emitted from the light emitting element 16 passes through the light guide plate 40 and the polarizing beam splitter 34, is reflected by the prism 40a, passes through the imaging element 20, is reflected by the display element 18, and passes through the reverse path to pass through the polarizing beam splitter. The light is reflected by 34 and enters the pupil 24 of the observer 12. External light 38 passes through the polarization beam splitter 34 and enters the pupil 24 of the observer 12. Therefore, the observer 12 can see the outside through the polarization beam splitter 34 together with the display image. Since the light guide plate 40 is thin, the light guide plate 40 can be easily placed in front of the eyes or can be easily retrofitted to the glasses.

In the display device of the present invention, since the light is focused on one point, the viewing position is limited (the viewing zone is narrow). Therefore, when the display device of the present invention is attached to glasses or the like, the position of the light emitting point of the light emitting element 16 is adjusted so that the image of the light emitting element 16 is formed at an appropriate position (the position of the observer's pupil). It is preferable to do this.
12 and 13 are diagrams showing an example of an optical system having a function of adjusting the position of the light emitting point of the light emitting element 16. 12 shows the optical system in one state, and FIG. 13 shows the optical system in FIG. 12 in another state. The optical system includes a light guide plate 42 made of transparent plastic, and a polarizing beam splitter 34 is formed in the middle of the light guide plate 42. The light emitting element 16 is disposed at one end of the light guide plate 42, and the imaging element 20 and the display element 18 are disposed at the other end of the light guide plate 42.

  Eye position sensors 43 and 44 are arranged on the light guide plate 42 so that the position of the pupil 24 of the observer 12 can be detected. The light emitting element 16 is formed as an LED array, and includes a plurality of LEDs 16a, 16b, and 16c. The pitch of the arrangement of the LEDs 16a, 16b, and 16c is equal to or smaller than the size of the pupil 24. The LEDs 16a, 16b and 16c to be used are selected according to the position of the pupil 24 detected by the eye position sensors 43 and 44.

In FIG. 12, the center LED 16b is selected, and the light emitted from the LED 16b passes through the light guide plate 42 and the polarizing beam splitter 34, passes through the imaging element 20, reflects off the display element 18, and passes through the reverse path. Then, the light is reflected by the polarization beam splitter 34 and enters the pupil 24 of the observer 12.
In FIG. 13, the pupil 24 indicated by the dotted line has moved to the position of the pupil 24 indicated by the solid line. Therefore, the left LED 16a is selected, and the light emitted from the LED 16a passes through the light guide plate 42 and the polarization beam splitter 34, passes through the imaging element 20, is reflected by the display element 18, passes through the reverse path, and is polarized. The light is reflected by the beam splitter 34 and enters the pupil 24 of the observer 12. In this way, even in a display device in which light is focused on a single point, the viewing zone can be widened. The light emitting element 16 is formed as a one-dimensional LED array, but may be formed as a two-dimensional LED array.

It is also possible to display one color image in the RGB pixels of the display element 18, emit light corresponding to the display image with the light emitting element 16, and realize a time division color in which the colors are changed in order.
FIG. 18 is a diagram showing a second embodiment of the optical system of the display device of FIG. The optical system 14 in this example is formed based on two equivalent ellipsoids 51 and 52. The first ellipsoid 51 has a first focus P1 and a second focus P2, and the second ellipsoid 52 has a third focus P3 and a fourth focus P4. The second focus P2 and the third focus P3 are arranged at a common position. The first concave mirror 53 is disposed on a part of the first ellipsoid 51, and the second concave mirror 54 is disposed on a part of the second ellipsoid 52.

  More specifically, the optical system 14 of the display device includes a display element 55, an imaging element 56, and first and second focal points P1 and P2 through which light emitted from the display element 55 and passed through the imaging element 56 passes. A first concave mirror 53 formed as a part of the first ellipsoid 51 having the second focal point P2, and a third focal point P3 and a fourth focal point P4 arranged at the same position as the second focal point P2. And a second concave mirror 54 formed as a part of the second ellipsoid 52 having the second ellipsoid 52.

  The light emitted from the display element 55 is collected at or near the first focal point P1, and the divergent light that has passed through the first focal point P1 is reflected by the first concave mirror 53 to be shared by the second and third common lenses. The light beam is focused toward or near the focal point P2, P3, and the diverging light passing through the second and third focal points P2, P3 is reflected by the second concave mirror 54 to be the fourth focal point P4. The observer's eyes (pupil 24) are arranged in the vicinity of the fourth focal point P4. Therefore, the display formed in front of the observer's eyes can be seen.

The display element 55 may be a transmissive or reflective liquid crystal display panel provided with a light source, a small mirror display element capable of forming an image by scanning minute light, or a self-luminous EL display element. it can. A light source may be provided separately from the display element 55.
As described above, the first concave mirror 53 and the second concave mirror using the first ellipsoid 51 and the second ellipsoid 52 in which the second focal point P2 and the third focal point P3 are arranged at a common position. By forming 54, more preferably, the first ellipsoid 51 and the second ellipsoid 52 are equivalent spheroids, whereby the symmetry of the optical system can be improved. Therefore, it is not necessary to use a plurality of complicated eccentric lenses as in the conventional case, and the entire apparatus can be made small and light.

  Since the imaging element 56 may be a simple convex lens, the first ellipsoid 51 and the second ellipsoid 52 serving as a base can be made small. Therefore, the display device is reduced in size. In particular, when the display device is mounted on the face or head of the observer, it is preferable that there is as little as possible on the face, and that the distance between the display element 55 and the eyes of the observer is some distance away. Since it is necessary, it is desirable that the display element 55 be disposed at a location away from the face (for example, the temporal region). Therefore, the display device is preferably configured to be long in a direction parallel to the face of the observer. In the present invention using the first ellipsoid 51 and the second ellipsoid 52, the display device is appropriately configured to be long in parallel with the face of the observer in order to satisfy this requirement. The thickness in the direction perpendicular to the face does not increase.

In FIG. 18, the first focal point P1, the second focal point P2, the third focal point P3, and the fourth focal point P4 are arranged in a straight line, and the first concave mirror 53 is the above-mentioned optical system 14. It is arranged on the opposite side of the second concave mirror 54 with respect to a line passing through the focal point.
19 and 20 are diagrams showing modifications of the optical system 14 of FIG. In FIG. 19, the first focal point P1, the second focal point P2, the third focal point P3, and the fourth focal point P4 (or the first to fourth focal points P1 to P4 in which the reflection in the light guide is developed). (Corresponding focal points) are arranged in a straight line, and the first concave mirror 53 is arranged on the same side of the second concave mirror 54 with respect to a line passing through the focal point of the optical system 14. A light guide 58 is provided between the first concave mirror 53 and the second concave mirror 54.

  The light guide 58 is an elongated transparent glass or plastic member extending in parallel with the lines passing through the first to fourth focal points P1, P2, P3 and the focal point P4, and has planes 58a and 58b parallel to each other. The first concave mirror 53 is disposed at one end of the light guide 58, and the second concave mirror 54 is disposed at the other end of the light guide 58. In this case, the light does not pass through the second and third focal points P2 and P3, but travels inside the light guide 58, but the light travels through the second and third focal points P2 and P3. Same as the case.

  That is, the light emitted from the display element 55 is collected at or near the first focal point P1, and the light diverging from the first focal point P1 is reflected by the first concave mirror 53 to be shared by the second and second common mirrors. Proceed toward the third focal point P2, P3. The light is repeatedly reflected several times on the surface of the light guide 58 (planes 58a and 58b). Accordingly, light traveling from the first concave mirror 53 toward the common second and third focal points P2 and P3 does not actually pass through the common second and third focal points P2 and P3. The light diverged through the virtual focal point and collected through the virtual focal point equivalent to the common second and third focal points P2 and P3 inside 58 is transmitted through the second and third focal points P2 and P3. Is reflected by the second concave mirror 54 and condensed in the vicinity of the fourth focal point P4, and the observer's eyes (pupil 24) are arranged in the vicinity of the fourth focal point P4. Yes. Therefore, the display formed in front of the observer's eyes can be seen.

  The light guide 58 of FIG. 19 is not limited to the one having the planes 58a and 58b parallel to each other. For example, this is not the case when the first ellipsoid 51 and the second ellipsoid 52 have different shapes or are designed to enter the eye at an angle other than vertical. Further, when the light guide 58 satisfies the condition of total reflection, it is not necessary to add a reflective film.

In FIG. 20, the first concave mirror 53 and the second concave mirror 54 are arranged on the same side of the light guide 58, and light enters the light guide 58 in the direction of the arrow L _I and is odd in the light guide 58. The light is reflected once and emitted from the light guide 58 in the direction of the arrow L _O.
FIG. 21 is a view showing a modification of the light guide 58. In this light guide 58, the first concave mirror 53 and the second concave mirror 54 are arranged on the opposite side of the light guide 58, and light enters the light guide 58 in the direction of the arrow L _I , and the light guide 58 And is emitted from the light guide 58 in the direction of the arrow L _O.

FIG. 22 is a view showing a modification of the light guide 58. The light guide 58 has a bent portion and is formed in a shape that fits the half of the face and head of the observer. Although the reflection film 60 is provided at the bent portion, the reflection film 60 may not be added if the total reflection condition is satisfied. In this way, the degree of freedom of arrangement of the display element 55 is increased.
FIG. 23 is a diagram showing the first ellipsoid 51 and the second ellipsoid 52 of the display device described with reference to FIGS. In FIG. 23, the first ellipsoid 51 and the second ellipsoid 52 are arranged, for example, in the XY plane.

  FIG. 24 shows a modification of the optical system of FIG. 23, and shows a first ellipsoid 51 and a second ellipsoid 52 arranged three-dimensionally. In FIG. 24, the first ellipsoid 51 is arranged in the XY plane, and the second ellipsoid 52 is arranged in a plane inclined with respect to the XY plane. The first concave mirror 53 and the second concave mirror 54 are not shown in FIGS. The first and fourth focal points P1 and P4 are indicated by arrows, and the second and third focal points P2 and P3 correspond to the origins of the coordinates in FIGS. Since the second and third focal points P2 and P3 are common, the principle of light travel described above is applied in this case as well.

  FIG. 25 is a diagram showing a display device including the optical system of FIG. The main body structure of the display device is abbreviated as glasses 10a. The optical system includes a display element 55 and a light guide 58. Other members of the optical system are omitted. A light guide 58 in FIG. 25 is obtained by modifying the light guide 58 in FIG. 22 according to the configuration of the first ellipsoid 51 and the second ellipsoid 52 in FIG. In FIG. 22, the light guide 58 is bent, the second concave mirror 54 is in front of the eyes, the first concave mirror 53 and the display element 55 are next to the ear, for example, and the display element 55 is the first concave mirror. 53 outside.

  The light guide 58 in FIG. 25 is bent in the same manner as the light guide 58 in FIG. 22, the second concave mirror 54 is in front of the eyes, and the first concave mirror 53 and the display element 55 are next to the ear, for example. In this case, the display element 55 comes to be positioned below the first concave mirror 53 according to the configuration of the first ellipsoid 51 and the second ellipsoid 52 in FIG. 61A is a circuit unit, and 61B is a cable.

  FIG. 26 to FIG. 28 are diagrams showing examples of optical systems to which a seal-through function is added. In FIG. 26, the second concave mirror 54 is a reflecting mirror having translucency. The second concave mirror 54 can be formed of a multilayer dielectric film or a film of chromium, aluminum, silver, titanium, or the like. The transmittance can be arbitrarily selected by designing the material and thickness of the membrane. In order to have a seal-through function, it is preferable that the background light 62 can pass through the second concave mirror 54, but the refraction is small and the distortion of the background image is small. For this purpose, the incident surface and the exit surface of the background light 62 need to be parallel, and it is preferable to add a correction plate 64 to the light guide 58.

  In FIG. 27, the second concave mirror 54 is formed using a hologram. In this case, the shape of the second concave mirror 54 is flat, but since the second concave mirror 54 is formed as a hologram, reflection similar to that of a part of the second ellipsoid 52 is realized as described above. And the transmittance can be controlled. Since the shape of the second concave mirror 54 is flat, the shape of the correction plate 64 is also simplified.

In FIG. 28, the second concave mirror 54 formed using a hologram is arranged on the flat surface of the light guide 58. In this way, it is not necessary to add the correction plate 64.
29 to 31 are views showing further modifications of the optical system of the present invention.
29 shows an optical system in which the first optical system shown in FIG. 1 and the second optical system shown in FIG. 22 are combined. That is, the first optical system includes the light emitting element 16, the optical element 22, the transmissive display element 18, and the imaging element 20. An aperture 66 is disposed at the position of the second focus of the imaging element 20. The second optical system includes a first concave mirror 53, a second concave mirror 54, and a light guide 58. In FIG. 18, the divergent light from the display element 55 is irradiated toward the first concave mirror 53 through the first focal point P 1, and the divergent light that has passed through the aperture 66 is directed toward the first concave mirror 53. Irradiate. The aperture 66 is located at the first focal point P1 of the second optical system. Thereby, an image similar to the image recognized in the aperture 66 can be recognized in the pupil 24.

In FIG. 30, a reflective display element 18 is used. Other configurations are the same as those in FIG.
In FIG. 31, the display element is constituted by a light emitting element 16 and a micromirror 68. The light emitting element 16 can be a laser or the like. The light emitting element 16 emits a minute light beam toward the micromirror 68. The micromirror 68 is a device such as a MEMS (Micro Electro Mechanical System) that can change an angle, and can scan a light beam. If the light amount of the light emitting element 16 is modulated in accordance with this scanning, an image is obtained. The micromirror 68 is much smaller than a liquid crystal panel, and a small display element can be realized. Although one micromirror 68 is shown in the figure, two simple MEMSs may be used for scanning in the XY directions.

  FIG. 32 is a diagram showing a further embodiment of the optical system of the display device of FIG. The optical system 14 in this example includes a display element 55, an imaging element 56, a light guide 71, and a concave mirror 72. The light guide 71 is made of a light transmitting material such as glass or resin, and has parallel and flat surfaces 71a and 71b and a flat light incident surface 71c. The concave mirror 72 is provided at the end of the light guide 71 opposite to the light incident surface 71c. The concave mirror 72 is formed based on a part of a spheroid 73 having a first focal point P1 and a second focal point P2. The surfaces 71a and 71b of the light guide 71 are parallel to a line passing through the first focal point P1 and the second focal point P2 of the concave mirror 72.

  The light emitted from the display element 55 and passing through the imaging element 56 is incident on the light incident surface 71c of the light guide 71, and is collected at or near the virtual focal point P2 'on the light incident surface 71c. It has become. The divergent light that passes through the virtual focal point P2 ′ is repeatedly reflected (total reflection) several times on the surfaces 71a and 71b of the light guide 71, and enters the concave mirror 72 so that the light enters the concave mirror 72 from the second focal point P2. Incident. The light reflected by the concave mirror 72 is collected at or near the first focal point P1, and enters the observer's eyes (pupil 24). Therefore, the display formed in front of the observer's eyes can be seen. Since light that does not pass through the virtual focal point P2 ′ may become noise light, it is desirable to arrange an aperture at the position of the virtual focal point P2 ′.

Thus, by arranging the light guide 71 in the lateral direction with respect to the observer's face, the display element 55 and the imaging element 56 interfere with the temporal region of the observer (a part near the ear). The display device can be configured so as not to occur.
The light incident surface 71c is preferably formed with an inclination with respect to the flat surfaces 71a and 71b so that light emitted from the display element 55 and passed through the imaging element 56 is incident on the light incident surface 71c perpendicularly. However, since the reflection angle of the light reflected by the elliptical concave mirror 72 changes on both sides of the optical axis, the image incident on the pupil 24 may be distorted. By adjusting the angle of the light incident surface 71c or inserting a distortion correction lens between the display element 55 and the light incident surface 71c, it is possible to reduce image distortion. In addition, a small and lightweight display device can be realized.

  FIG. 33 is a view showing a modification of the optical system 14 of FIG. FIG. 34 is an enlarged view showing a part of the light guide in FIG. In FIG. 32, the display element 55 and the imaging element 56 are arranged on the side far from the face of the observer. In contrast, in the example of FIGS. 33 and 34, the display element 55 and the imaging element 56 are arranged on the side close to the face of the observer. In this way, the display element 55 and the imaging element 56 can be easily disposed on the temporal region (near the ear) of the observer.

  For this reason, the light incident surface 71c of the light guide 71 is formed as a part of the surface 71a, and the reflective film 74 is disposed on the inclined surface 71d which is the light incident surface 71c in FIG. A total reflection surface may be used instead of the reflection film 74. Therefore, the light that has passed through the display element 55 and the imaging element 56 enters the light guide 71 from the light incident surface 71c, is reflected by the reflecting surface of the reflecting film 74, and is a virtual focal point P2 ′ on the reflecting film 74. The light is focused on or in the vicinity thereof. As described above, the divergent light passing through the virtual focal point P2 ′ is repeatedly reflected (total reflection) several times on the surfaces 71a and 71b of the light guide 71, and the light incident on and reflected by the concave mirror 72 is the first. The light is condensed at or near one focal point P1 and enters the observer's eyes (pupil 24). Therefore, the display formed in front of the observer's eyes can be seen.

  Since the virtual focal point P2 ′ is a condensing point, the reflective film 74 may be small. The reflective film 74 is formed by depositing a reflective film material such as a multilayer film of metal or oxide such as aluminum or silver on only a part of the inclined surface 71d of the light guide 71, and the other part of the inclined surface 71d is incident. Try to transmit light. In this way, the aperture function described in the example of FIG. 32 is provided, and it is possible to suppress the light that does not transmit through the virtual focal point P2 ′ from becoming noise light. Further, a light absorbing layer may be provided on the non-reflecting portion of the inclined surface 71d. For example, after the reflective film 74 is formed, a black substance such as chromium oxide or black ink may be applied to the entire inclined surface 71d.

  FIG. 35 is a diagram showing a further embodiment of the optical system of the display device of FIG. The optical system 14 of this example includes a display element 55, an imaging element 56, a first concave mirror 77 formed based on a part of a first paraboloid 76 having a first focal point P1, And a second concave mirror 79 formed based on a part of the second rotating paraboloid 78 having the second focal point P2.

  The light emitted from the display element 55 and passing through the imaging element 56 is condensed at or near the second focus P2 of the second paraboloid 78, and the divergent light passing through the second focus P2 is It is reflected by the second concave mirror 79 and becomes parallel light. The parallel light enters the first concave mirror 77, and the light reflected by the first concave mirror 77 is collected at or near the first focal point P1 and enters the observer's eyes (pupil 24). Therefore, the display formed in front of the observer's eyes can be seen.

  In this way, by making parallel light incident on the first concave mirror 77, a small and lightweight display device can be realized. A second concave mirror 79 is used as means for generating parallel light. Preferably, the first paraboloid 76 and the second paraboloid 78 have the same focal length and are arranged so that their central axes coincide. In this way, an image having high symmetry and no distortion can be formed. Since the light that does not pass through the second focal point P2 becomes noise light, it is possible to suppress the noise light by arranging an aperture at the second focal point P2.

The first and second reflecting mirrors 77 and 79 are attached to an appropriate holder, and a space is formed between the first reflecting mirror 77 and the second reflecting mirror 79, and parallel light travels through the space.
36 and 37 are diagrams showing examples of the arrangement of the first and second reflecting mirrors 77 and 79. FIG. In FIG. 36, the first and second reflecting mirrors 77 and 79 are arranged at both ends of a light guide 80 made of plastic such as columnar glass or acrylic resin. Light propagates in the light guide 80 as parallel light. The light guide 80 is made by molding using a mold, and the first and second reflecting mirrors 77 and 79 deposit aluminum on both ends of the light guide 80.

  In FIG. 37, the first and second reflecting mirrors 77 and 79 are disposed at both ends of the hollow cylindrical light guide 80a (the first reflecting mirror 77 is not shown). The light propagates as parallel light in the cavity inside the light guide 80a. The light guide 80a is formed by molding using a mold, and the first and second reflecting mirrors 77 and 79 are separately formed and bonded to both ends of the light guide 80a. The light guide 80a only needs to have air inside, but the light guide 80a is preferably sealed in order to prevent dust from getting on the mirror surface. In order to prevent condensation, the light guide 80a may be filled with a gas such as nitrogen gas or evacuated.

  FIG. 38 is a diagram showing a modification of the display device of FIG. The optical system 14 of this example includes a display element 55, an imaging element 56, a first concave mirror 77 formed based on a part of a first paraboloid 76 having a first focal point P1, It consists of a lens 81 for making the light emitted from the display element 55 and passing through the imaging element 56 into parallel light. An aperture 82 is disposed at the focal position of the imaging element 56. The parallel light produced by the lens 81 is incident on the first concave mirror 77, and the light reflected by the first concave mirror 77 is condensed at or near the first focal point P1, and the observer's eyes (pupil 24). ). Therefore, the display formed in front of the observer's eyes can be seen.

  FIG. 39 is a diagram showing a modification of the optical system of the display device of FIG. The optical system 14 of this example is the same as the example of FIG. 38 except that the first concave mirror 77 is provided at one end of the light guide 80. A parabolic concave mirror has a complicated shape and is not easy to process compared to a general spherical lens. Accordingly, the number of parabolic concave mirrors should be small. Therefore, in FIG. 38 and FIG. 39, one parabolic concave mirror is used. Although the incident surface of the light guide 80 is a flat surface in the illustrated example, the incident surface of the light guide 80 may be formed in a shape having the function of the imaging element 56. Further, when the light incident on the display element 55 is convergent light, the imaging element 56 may be omitted.

  40 and 41 are diagrams showing modifications of the optical system of the display device of FIGS. 38 and 39, respectively. In FIG. 40, a reflection film 83 is inserted between the lens 81 and the first concave mirror 77 so as to bend the optical path. In FIG. 40, a reflective film 83 is inserted between the lens 81 and the end portion of the light guide plate 80 so as to bend the optical path. By doing in this way, many optical components can be arrange | positioned in the position which remove | deviated from the observer's face, ie, the position close | similar to an observer's temporal region (ear vicinity). When the center of gravity of the display device is close to the face, the user feels heavy when wearing the display device and is likely to get tired. In order to achieve a natural feeling of wearing, it is better not to place the parts as close to the face as possible. Instead of the reflective film 83, a total reflection surface can be used.

  FIG. 42 is a diagram showing a modification of the optical system of the display device of FIG. In this example, the light guide plate 80 is formed in a shape bent at a right angle, the reflective film 83 is inserted between the lens 81 and the end of the light guide plate 80, and the reflective film 84 is inserted into the bent portion of the light guide plate 80. The optical path is bent. Instead of the reflection films 83 and 84, a total reflection surface can be used. By doing in this way, the structure of a display apparatus can be fitted with an observer's face and head. In the illustrated example, the part of the apparatus including the lens 81 from the display element 55 is disposed in a direction protruding outward from the temporal region of the observer, but the end of the light guide plate 80 where the reflective film 83 is disposed. 42 is formed at an angle inclined by 45 degrees with respect to the paper surface of FIG. 42, and the portion of the device including the lens 81 from the display element 55 can be directed downward from the light guide plate 80. In this way, the part of the device including the lens 81 from the display element 55 can be put on the ear like a temple of glasses.

The display device of FIG. 42 can be used, for example, in the same manner as the display device shown in FIG.
FIG. 43 is a diagram showing a modification of the optical system of the display device of FIG. In this example, the light emitting element 16 of the first optical system shown in FIG. 1 and the optical element 22 are added to the optical system of FIG. The light emitting element 16 and the optical element 22 produce parallel light, the light passing through the display element 55 and the imaging element 56 is collected by the aperture 82, and the divergent light passing through the aperture 82 is guided to the light guide 80, and the first light is emitted. The light reflected by the concave mirror 77 enters the pupil 24. Therefore, an image similar to the image recognized by the aperture 82 can be recognized by the pupil 24.

  FIG. 44 is a diagram showing a modification of the optical system of the display device of FIG. In this example, the light emitting element 16 is provided, and the imaging element 56 a is provided in front of the light emitting element 16. The light passing through the light emitting element 16 and the imaging element 56a is collected by the aperture 82, the diverging light passing through the aperture 82 is guided to the light guide 80, and the light reflected by the first concave mirror 77 is incident on the pupil 24. To do. Therefore, an image similar to the image recognized by the aperture 82 can be recognized by the pupil 24.

FIG. 45 is a diagram showing a modification of the optical system of the display device of FIG. In FIG. 45, a reflective display element 55 is used. Other configurations are the same as those in FIG.
46 is a diagram showing a modification of the optical system of the display device of FIG. As in the case of FIG. 31, in FIG. 46, the display element is composed of the light emitting element 16 and the micromirror 68. The light emitting element 16 can be a laser or the like. The light emitting element 16 emits a minute light beam toward the micromirror 68. The micromirror 68 is a device that can change the angle, such as MEMS, and can scan a light beam. If the light amount of the light emitting element 16 is modulated in accordance with this scanning, an image is obtained. Although one micromirror 68 is shown in the figure, two simple MEMSs may be used for scanning in the XY directions.

43 to 46, the first concave mirror 77 having a parabolic shape is used. Instead of the first concave mirror 77 having a parabolic shape, the elliptical concave mirror shown in FIGS. 32 to 34 is used. 72 can also be used.
(Appendix)
The technical idea of the present invention grasped from the above explanation is as follows.

  1. A display device disposed in front of an eye of an observer, comprising: a light emitting element; a display element illuminated by the light emitting element; and an imaging element that allows light passing through the display element to pass therethrough. Is disposed between the imaging element and the first focal point of the imaging element at a position close to the first focal point, so that a virtual image of the display element is formed by the imaging element, and the light emission A display device characterized in that light emitted from an element is condensed at a second focal point of the imaging element.

2. The display device according to appendix 1, wherein an optical element that collimates light incident on the display element is disposed between the light emitting element and the display element.
3. The display element is a transmissive display element, the optical element is disposed on one side of the display element, and the imaging element is disposed on the opposite side of the display element. The display device described in 1.

4). The display device according to appendix 2, wherein the display element is a reflective display element, and the optical element and the imaging element are a common element.
5. A display element; an imaging element; and a first ellipsoid formed as part of a first ellipsoid having a first focal point and a second focal point through which light emitted from the display element and passed through the imaging element passes. One concave mirror and a second concave mirror formed as part of a second ellipsoid having a third focal point and a fourth focal point disposed at a common position with the second focal point, Light emitted from the display element is collected in the vicinity of the first focal point, and the light passing through the first focal point is reflected by the first concave mirror toward the common second and third focal points. The light passing through the second and third focal points or the equivalent light is reflected by the second concave mirror and collected near the fourth focal point, and the observer's eyes It is arranged near the focal point of the viewer so that the display formed in front of the observer's eyes can be seen. The display device according to symptoms.

6). The display device according to appendix 5, wherein the first concave mirror and the second concave mirror are provided in a light guide.
7). The display device according to appendix 5, wherein the first focus, the second focus, the third focus, and the fourth focus are in a straight line.
8). The display device according to appendix 5, wherein the first focus, the second focus, the third focus, and the fourth focus are not in a straight line.

9. The display device according to appendix 5, wherein the second concave mirror is light transmissive.
10. A display device disposed in front of an eye of an observer, comprising: a light emitting element; a display element illuminated by the light emitting element; and an imaging element that allows light passing through the display element to pass therethrough. Is disposed between the imaging element and the first focal point of the imaging element at a position close to the first focal point, so that a virtual image of the display element is formed by the imaging element, and the light emission The light emitted from the element is collected at the second focus of the imaging element;
A first concave mirror formed as part of a first ellipsoid having a third focus and a fourth focus common to the second focus of the imaging element, and a position common to the fourth focus And a second concave mirror formed as part of a second ellipsoid having a fifth focus and a sixth focus, the light emitted from the display element of the third focus Light collected in the vicinity and passing through the third focal point is reflected by the first concave mirror and travels toward the common fourth and fifth focal points, and passes through the fourth and fifth focal points. Light or equivalent light is reflected by the second concave mirror and collected near the sixth focal point, and the observer's eyes are placed near the sixth focal point. A display device characterized in that a display formed in front of the eyes can be seen.

  11. A display device disposed in front of an observer's eyes, comprising: a display element; an imaging element that collects light emitted from the display element; and an incident surface on which light that has passed through the imaging element is incident And a concave mirror provided on the light guide so as to receive light passing through the light guide, the concave mirror being part of an ellipsoid having a first focal point and a second focal point. The formed light passing through the imaging element is reflected a plurality of times inside the light guide, and the light is incident on the concave mirror as if it is incident on the concave mirror from the second focal point P2, and is reflected by the concave mirror. The display device is characterized in that the emitted light is collected at or near the first focal point and is incident on the eyes of an observer.

12 The light guide has a pair of opposed flat surfaces and an inclined surface inclined with respect to the flat surface, and the light passing through the imaging element is collected on the inclined surfaces, The display device according to appendix 11, wherein the display device is reflected by the opposing flat surfaces.
13. A display device disposed in front of an eye of an observer, comprising: a display element; an optical element that irradiates light that passes through the display element or light that passes through the display element; The concave mirror is formed as a part of a rotating paraboloid, and the light reflected by the concave mirror is collected at or near the focal point of the rotating paraboloid, A display device characterized by being incident on an eye.

14 The display device according to appendix 13, wherein the optical element comprises a further concave mirror formed as a part of a paraboloid of revolution.
15. The display device according to appendix 14, wherein the concave mirror and the further concave mirror are provided in a light guide.

  As described above, according to the present invention, as a small and low-priced display device, a head-mounted or glasses-type display device, or any small or ultra-compact display device similar to this, for example, a portable display device. It can be used as a (display).

DESCRIPTION OF SYMBOLS 16 Light emitting element 18 Display element 20 Imaging element 22 Optical element 24 Pupil 28 Virtual image 32 Half mirror 34 Polarizing beam splitter 40 Light guide plate 43, 44 Eye position sensor 51, 52 Ellipsoidal body 53, 54 Concave mirror 55 Display element 56 Imaging element 58 Light guide 71 Light guide 72 Concave mirror 73 Spheroidal body 74 Reflective film 76, 78 Revolving paraboloid 77, 79 Concave mirror 80 Light guide 81 Lens

Claims (8)

  A display element; an imaging element; and a first ellipsoid formed as part of a first ellipsoid having a first focal point and a second focal point through which light emitted from the display element and passed through the imaging element passes. One concave mirror and a second concave mirror formed as part of a second ellipsoid having a third focal point and a fourth focal point disposed at a common position with the second focal point, Light emitted from the display element is collected in the vicinity of the first focal point, and the light passing through the first focal point is reflected by the first concave mirror toward the common second and third focal points. The light passing through the second and third focal points or the equivalent light is reflected by the second concave mirror and collected near the fourth focal point, and the observer's eyes It is arranged near the focal point of the viewer so that the display formed in front of the observer's eyes can be seen. The display device according to symptoms.   The display device according to claim 1, wherein the first concave mirror and the second concave mirror are provided in a light guide.   The display device according to claim 1, wherein the second concave mirror is light transmissive. A display device disposed in front of an eye of an observer, comprising: a light emitting element; a display element illuminated by the light emitting element; and an imaging element that allows light passing through the display element to pass therethrough. Is disposed between the imaging element and the first focal point of the imaging element at a position close to the first focal point, so that a virtual image of the display element is formed by the imaging element, and the light emission The light emitted from the element is collected at the second focus of the imaging element;
A first concave mirror formed as part of a first ellipsoid having a third focus and a fourth focus common to the second focus of the imaging element, and a position common to the fourth focus And a second concave mirror formed as part of a second ellipsoid having a fifth focus and a sixth focus, the light emitted from the display element of the third focus Light collected in the vicinity and passing through the third focal point is reflected by the first concave mirror and travels toward the common fourth and fifth focal points, and passes through the fourth and fifth focal points. Light or equivalent light is reflected by the second concave mirror and collected near the sixth focal point, and the observer's eyes are placed near the sixth focal point. A display device characterized in that a display formed in front of the eyes can be seen.   A display device disposed in front of an observer's eyes, comprising: a display element; an imaging element that collects light emitted from the display element; and an incident surface on which light that has passed through the imaging element is incident And a concave mirror provided on the light guide so as to receive light passing through the light guide, the concave mirror being part of an ellipsoid having a first focal point and a second focal point. The formed light passing through the imaging element is reflected a plurality of times inside the light guide, and the light is incident on the concave mirror as if it is incident on the concave mirror from the second focal point P2, and is reflected by the concave mirror. The display device is characterized in that the emitted light is collected at or near the first focal point and is incident on the eyes of an observer.   The light guide has a pair of opposed flat surfaces and an inclined surface inclined with respect to the flat surface, and the light passing through the imaging element is collected on the inclined surfaces, The display device according to claim 5, wherein the display device is reflected by the opposing flat surfaces.   A display device disposed in front of an eye of an observer, comprising: a display element; an optical element that irradiates light that passes through the display element or light that passes through the display element; The concave mirror is formed as a part of a rotating paraboloid, and the light reflected by the concave mirror is collected at or near the focal point of the rotating paraboloid, A display device characterized by being incident on an eye.   8. A display device according to claim 7, wherein the optical element comprises a further concave mirror formed as part of a paraboloid of revolution.

Images