JP2000221441A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size and weight by reducing the thickness of the entire part of the optical system and to prevent an increase in the size of the optical system and an increase in its cost in spite of dealing with high-fineness images since an LCD is not used by using a reflection mirror consisting of a rear surface reflection mirror or surface reflection mirror for a pupil transmission lens. SOLUTION: The signal light 3 emitted from an image signal generator 2 as a light beam emitting means for emitting the light beam corresponding to an image signal is scanned so as to two-dimensionally shake the optical path of the signal light 3 according to a synchronizing signal so as to form an image by the two-dimensional scanning reflection mirror 6 as a scanning means disposed at a reflection optical element 4. The two-dimensional scanning reflection mirror 6 is the reflection mirror made of thin and light silicon formed by a semiconductor process and the front surface of the reflection mirror is subjected to coating with reflection films. The incident luminous flux on such two-dimensional scanning reflection mirror 6 is converging light and the signal light 3 scanned by the two-dimensional scanning reflection mirror 6 is made incident on the pupil projection lens 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly to a display device that can be worn on the head or face of a wearer and that displays image information on the pupil of the wearer.

[0002]

2. Description of the Related Art A glasses-type portable display device conventionally developed as a display device that can be worn on the head or face of a wearer forms a virtual image with a flat display panel such as an LCD (liquid crystal display device). It is composed of optical elements.

For example, a glasses-type portable display disclosed in US Pat. No. 5,745,295 has a configuration in which a virtual image of an LCD 112 formed by an optical element 111 is viewed by a pupil 113 of a wearer's eye as shown in FIG. I have.

In addition, instead of the flat display panel, a method of directly drawing information on the fundus of a wearer by scanning a light beam has been proposed.

For example, in the portable display disclosed in US Pat. No. 5,596,339, a light beam 123 is two-dimensionally scanned by a mirror 121 and a mirror 122 to form an aerial image 124 as shown in FIG. Is viewed on the pupil of the wearer's eye via the refraction lens 125.

[0006]

However, in the above-mentioned glasses-type portable display device using an LCD as the conventional flat display panel shown in FIG. 9 as described above, when a high-definition display is performed, a high-definition display is required. Since an LCD is required, the size of the LCD itself becomes large, making it difficult to reduce the size of the display device, and the use of a high-definition LCD has the disadvantage of increasing the cost.

In particular, in this type of glasses-type portable display device, since the LCD is installed in a portion corresponding to the lens portion of the glasses, it is difficult to reduce the size and weight around the lens portion and burden the wearer's nose when wearing. And it is difficult to reduce discomfort.

Further, in the case of a method of directly drawing information on a fundus of a wearer by scanning a light beam as shown in FIG. An image needs to be formed, and one set of imaging optical systems is required more than the method using an LCD.

In the case of this direct drawing method,
When the aerial image formed by scanning is made to enter the pupil of the wearer's eye, if the light is not properly transmitted to the pupil of the wearer, the speed of light for forming an image at the edge of the screen does not sufficiently enter the pupil and the periphery of the image becomes dark. And an extra pupil projection lens is required.

Heretofore, as the pupil projection lens (which also has an image forming function), a refraction lens has been used, so that the optical system has become large, and it has been difficult to reduce the size of the glasses-type display.

In view of the above, the present invention has been made in view of the above points, and has a display device such as a glasses type which directly draws information on a fundus of a wearer using a light source, a scanning element, and a pupil transmission lens. By using a reflector consisting of a back reflector or a front reflector for the pupil transmission lens, the thickness of the entire optical system can be reduced and the size and weight can be reduced, and high definition images can be obtained because an LCD is not used. It is an object of the present invention to provide a display device in which the size of the optical system does not increase and the cost does not increase even if the device is adapted.

[0012]

According to the present invention, there is provided a display device which can be worn on the head or face of a wearer and emits a light beam corresponding to an image signal. Light beam emitting means, scanning means for two-dimensionally deflecting the optical path of the light beam in synchronization with the image signal, and reflecting the light beam whose light path has been deflected by the scanning means on a reflecting surface to allow the wearer And an optical system for guiding to the pupil of the display device.

According to the present invention, in order to solve the above-mentioned problems, (2) the reflecting surface of the optical system is formed on the back surface of a transparent member. Is provided.

According to the present invention, in order to solve the above problems, (3) the display device according to (1) or (2), wherein the reflection surface of the optical system is a Fresnel reflection surface. Is provided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment will be described with reference to FIGS.

FIG. 1 is a perspective view showing a schematic configuration of a glasses type display device applied as the display device according to the first embodiment.

That is, as shown in FIG. 1, a signal light 3 generated from an image signal generating device 2 attached to a temple 1 of a spectacle is reflected by a reflecting optical element 4 including a scanning system provided on a lens surface of the spectacle. The image is projected into the eye 5 of a wearer who wears the glasses-type display device.

Here, the image signal generator 2 includes R,
G and B LEDs (light emitting diodes) or LDs (semiconductor lasers) and an intensity modulation circuit are provided.

In this case, the video signal, the synchronization signal, etc.
It does not necessarily need to be generated in the image signal generating device 2,
It may be introduced from outside.

FIG. 2 is a partial sectional view for explaining the reflection optical element 4 of FIG. 1 in detail.

That is, as shown in FIG. 2, a signal light 3 emitted from an image signal generator 2 as a light beam emitting means for emitting a light beam corresponding to an image signal is scanned by a scanning light provided on a reflection optical element 4. Two-dimensional scanning reflecting mirror 6 as means
According to the synchronization signal to form an image by
The signal light 3 is scanned such that the optical path of the signal light 3 is two-dimensionally swung.

Here, the two-dimensional scanning reflecting mirror 6 is a thin and light reflecting mirror made of silicon formed by a semiconductor process, and its surface is coated with a reflecting film.

The light beam incident on the two-dimensional scanning reflecting mirror 6 is a convergent light as shown in FIG.

An optical system (not shown) for obtaining the convergent light is provided, for example, immediately before the two-dimensional scanning reflecting mirror 6, but may be incorporated in the image signal generator 2.

Then, the signal light 3 scanned by the two-dimensional scanning reflecting mirror 6 is incident on a pupil projection lens 7.

The pupil projection lens 7 is an optical system having a positive power as a whole.

The pupil projection lens 7 is common to the entrance surface 8 on the side of the two-dimensional scanning reflecting mirror 6 and, for example, a total reflection surface 10, a rear reflection mirror surface 9, and a total reflection surface 10 formed on the back surface of a transparent member. And the refraction exit surface 10.

In this case, the number of the pupil projection lens 7 is one.
The pupil projection lens 7 can correct the aberration that occurs when the light passes through the optical surface.

Further, the pupil projection lens 7 makes it possible to display a large-screen high-quality image on the eye 5 of the wearer who wears the glasses-type display device.

Then, the signal light 3 emitted from the refraction exit surface 10 enters the pupil 12 of the eye 11 of the wearer.

In this case, in order to guarantee a large angle of view as a display image given to the wearer, it is generally necessary to enlarge the pupil transmission lens.

FIG. 3 is a diagram illustrating a case where a refraction lens is used as a pupil transmission lens.

However, as shown in FIG. 3, when a refractive lens is used as the pupil transmission lens, the entire optical system including the two-dimensional scanning reflecting mirror (scanning optical system) 6 becomes large, and the size of the glasses-type display device is reduced. Is difficult.

For this reason, in the present invention, a pupil projection lens 7 constituting a reflecting mirror as shown in FIG. 2 is used as a pupil transmission lens.

As a result, the pupil projection lens 7 constituting the reflecting mirror used as the pupil transmission lens can provide a thin and small optical system as shown in FIG. 2, so that the weight can be reduced.

FIG. 4 is a view for explaining in detail the positional relationship between the optical elements to facilitate understanding of the present invention.

That is, as shown in FIG. 4, the signal light emitted from the two-dimensional scanning reflecting mirror 6 is
Is projected onto the pupil 12 of the wearer's eye.

Here, the pupil projection lens 7 is shown in the form of a refraction lens in order to facilitate drawing.

The signal light incident on the pupil 12 of the wearer's eye forms an image on the fundus 14 by the crystalline lens 15 immediately behind the pupil 12.

This image is a virtual image 13 of the aerial image 16 created by the two-dimensional scanning mirror 6.

The two-dimensional scanning reflecting mirror 6 has an aerial image 1
A light beam converging at the position 6 is incident.

Normally, the position of the virtual image 13 is set to about 1 m to 3 m for easy viewing, but of course, any position up to infinity may be used.

At this time, it is desirable that the luminous flux diameter of the signal light on the pupil 12 be larger than the pupil 12 diameter so that the wearer's eyes are easy to see even if the eyes are displaced.

In some cases, the pupil projection lens 7 causes chromatic aberration. G. FIG. When images of each color B are drawn at the same timing, color bleeding occurs.

However, in consideration of the positional shift of each color image generated by the pupil projection lens 7 in advance, by shifting the timing when the image signal of each color is carried on the luminance signal, the pupil projection lens 7 Chromatic aberration correction can be eliminated.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG.

The schematic configuration of the glasses-type display device according to the second embodiment is similar to that of the glasses-type display device applied as the display device according to the first embodiment shown in FIG. Since the configuration is the same, the description is omitted.

FIG. 5 is a partial cross-sectional view for describing the reflection optical element 4 of FIG. 1 in detail.

That is, as shown in FIG. 5, the signal light generated from the image signal generator 2 attached to the member 18 integrally formed with the pupil projection lens 7
The light is scanned by the two-dimensional scanning reflecting mirror 6 provided in 8 and projected into the eye 11 of the wearer by the pupil projection lens 7.

Here, the two-dimensional scanning reflection mirror 6 is composed of a small and lightweight silicon mirror made by a semiconductor process and a driving mechanism.

The pupil projection lens 7 is composed of an entrance surface 8 on the two-dimensional scanning reflection mirror 6 side, a total reflection surface 10, a Fresnel lens 17 as a Fresnel reflection surface, and a refraction exit surface 10 common to the total reflection surface 10. It is made up.

In this case, the number of pupil projection lenses 7 is one.
The pupil projection lens 7 can correct the aberration that occurs when the light passes through the optical surface.

Further, the pupil projection lens 7 makes it possible to display a large-screen high-quality image on the eye 5 of the wearer wearing the glasses-type display device.

Since the deflection angle of the light beam can be increased by the Fresnel lens 17, the thickness of the pupil projection lens 7 can be reduced accordingly.

An ordinary reflecting surface has the same incident angle and the same reflecting angle. However, by using the Fresnel lens 17 for the reflecting surface of the pupil projection lens 7, the reflecting angle can be made larger than the incident angle.

Then, the signal light 3 emitted from the emission surface 10 enters the pupil 12 of the eye 11 of the wearer.

The following description according to the second embodiment is the same as that of the glasses-type display device applied as the display device according to the first embodiment.
The description is omitted.

(Third Embodiment) Next, a third embodiment will be described with reference to FIG.

The schematic configuration of the glasses-type display device according to the third embodiment is similar to that of the glasses-type display device applied as the display device according to the first embodiment shown in FIG. Since the configuration is the same, the description is omitted.

FIG. 6 is a partial cross-sectional view for explaining the reflection optical element 4 of FIG. 1 in detail.

That is, as shown in FIG. 6, the signal light 3 generated from the image signal generator 2 attached to the member 19 integrally formed with the pupil projection lens 7 The pupil is scanned by the dimensional scanning reflector 6 and projected by the pupil projection lens 7 into the eye 11 of the wearer.

Here, the pupil projection lens 7 is composed of the entrance surface 20 on the side of the two-dimensional scanning reflection mirror 6, the back reflection mirror 9, and the refraction / exit surface 20 common to the entrance surface 20.

In this case, the number of pupil projection lenses 7 is one.
The pupil projection lens 7 can correct the aberration that occurs when the light passes through the optical surface.

Further, the pupil projection lens 7 makes it possible to display a large-screen high-quality image on the eye 5 of the wearer who wears the glasses-type display device.

In the third embodiment, the back reflector 9
, The thickness of the pupil projection lens 7 can be reduced accordingly.

The signal light 3 emitted from the emission surface 10 enters the pupil 12 of the eye 11 of the wearer.

The following description according to the third embodiment is the same as that of the glasses-type display device applied as the display device according to the first embodiment.
The description is omitted.

(Fourth Embodiment) Next, a fourth embodiment will be described with reference to FIG.

The schematic configuration of the glasses-type display device according to the fourth embodiment is similar to that of the glasses-type display device applied as the display device according to the first embodiment shown in FIG. Since the configuration is the same, the description is omitted.

FIG. 7 is a partial cross-sectional view for explaining the reflection optical element 4 of FIG. 1 in detail.

That is, as shown in FIG. 7, the signal light generated from the image signal generator 2 attached to the vine (not shown) is scanned by the two-dimensional scanning reflector 6 also provided on the vine. Then, it is projected into the eye 11 of the wearer by the pupil projection lens 7.

Here, the pupil projection lens 7 is composed of the entrance surface 10 on the side of the two-dimensional scanning reflection mirror 6, the back surface reflection mirror 21 constituted by a Fresnel lens, and the refraction exit surface 10 common to the entrance surface 10. .

In this case, the number of the pupil projection lens 7 is one.
The pupil projection lens 7 can correct the aberration that occurs when the light passes through the optical surface.

Further, the pupil projection lens 7 makes it possible to display a large-screen high-quality image on the eye 5 of the wearer who wears the glasses-type display device.

In the fourth embodiment, the deflection angle is increased because the back reflector 21 having the Fresnel lens is used, and the thickness of the pupil projection lens 7 can be reduced accordingly.

The signal light 3 emitted from the emission surface 10 enters the pupil 12 of the eye 11 of the wearer.

In the fourth embodiment, only the back reflector 21 having a Fresnel lens is provided in the lens portion of the glasses, and the weight of this portion has been reduced, thereby realizing a comfortable wearing feeling. Can be.

If the image signal generator 2, the two-dimensional scanning reflecting mirror 6, and the pupil projection lens 7 are integrated in one lightweight frame, a display device that can be attached to glasses as an attachment is also possible.

The following description according to the fourth embodiment is the same as that of the glasses-type display device applied as the display device according to the first embodiment.
The description is omitted.

(Fifth Embodiment) Next, a fifth embodiment will be described.

The schematic configuration of the glasses-type display device according to the fifth embodiment is similar to that of the glasses-type display device applied as the display device according to the first embodiment shown in FIG. Since the configuration is the same, the description is omitted.

That is, in the fifth embodiment, a surface reflecting mirror is simply used without being shown.

For example, in FIG. 2, a front surface reflecting mirror is used at the position of the back surface reflecting mirror 9.

In this case, assuming that the two-dimensional scanning reflecting mirror 6 is located at the same position as in FIG. 2, the front reflecting mirror needs to be tilted more than the back reflecting mirror 9, and the optical system tends to be thick. is there.

It is to be noted that US Pat.
g. As disclosed in 4), there is an example using a surface reflecting mirror. However, in this example, since the surface reflecting mirror is not a pupil projection lens, a separate pupil tracking configuration is required.

FIG. 8 shows one method of colorizing the light source.

That is, in FIG. G. FIG. The light of each of the semiconductor lasers B is combined by a prism.

Such a configuration is very simple and inexpensive as compared with a synthetic optical system using a normal dichroic mirror.

In the specification of the present invention described in the first to fifth embodiments as described above, in addition to claims 1 to 3 described in the claims, the following supplementary notes 1 .
To 9. The invention as shown in the following is included.

Appendix 1 A glasses-shaped display device,
A light beam emitting unit that is disposed at a position corresponding to a temple of glasses and emits a light beam according to an image signal, and a scanning unit that two-dimensionally moves an optical path of the light beam in synchronization with the image signal; An optical system provided at a position corresponding to the lens of the glasses, wherein the optical system reflects a light beam whose optical path is deflected by the scanning means on a reflection surface and guides the light beam to a pupil of a wearer. apparatus.

[0092] Appendix 2 2. The display device according to claim 1, wherein the reflection surface of the optical system is formed on a back surface of a transparent member.

Appendix 3 3. The display device according to claim 1, wherein the reflection surface of the optical system is a Fresnel reflection surface.

Appendix 4 In a glasses-type display device that directly draws information on a fundus of a wearer by using a light source, a scanning element, and a pupil transmission lens, the glasses are characterized in that the pupil transmission lens comprises a back reflection mirror or a front reflection mirror. Type display device.

Appendix 5 3. The back reflection mirror or the front reflection mirror is a reflection type Fresnel lens. A glasses-type display device as described.

Appendix 6 3. The scanning element according to claim 4, wherein the scanning element comprises a mirror made by using a semiconductor process. Or 5. A glasses-type display device as described.

Appendix 7 The pupil transmission lens is one transparent body composed of two refracting surfaces and two reflecting surfaces, one of the two reflecting surfaces is a reflecting surface by total reflection, and the two refracting surfaces are two refracting surfaces. 6. The glasses-type display device according to claim 6, wherein the display device also serves as one of the surfaces.

[Supplementary Note 8] 7. The glasses-type display device according to claim 6, wherein the pupil transmission lens is one transparent body including a refraction surface and a back reflection surface, and the light beam reflected by the back reflection mirror passes through the refraction surface again.

Appendix 9 3. A luminance signal obtained by correcting each color image necessary for color display in advance in consideration of the amount of chromatic aberration generated by the pupil transmission lens including the back reflector. To Appendix 8. A glasses-type display device as described.

[0100]

Therefore, as described above, according to the present invention, in a display device such as a glasses type in which information is directly drawn on a fundus of a wearer by a light source, a scanning element, and a pupil transmission lens, By using a reflecting mirror composed of a back reflecting mirror or a front reflecting mirror for the transmission lens, the thickness of the entire optical system can be reduced to make the optical system smaller and lighter.
Since a CD is not used, it is possible to provide a display device that does not increase the size of the optical system and does not increase the cost even when a high definition image is supported.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a glasses-type display device applied as a display device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view for explaining in detail a reflective optical element 4 according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a case where a refractive lens is used as a pupil transmission lens.

FIG. 4 is a view for explaining the positional relationship of each optical element in detail in order to facilitate understanding of the present invention.

FIG. 5 is a partial cross-sectional view for describing in detail a reflective optical element 4 according to a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view for describing in detail a reflective optical element 4 according to a third embodiment of the present invention.

FIG. 7 is a partial cross-sectional view for describing in detail a reflective optical element 4 according to a fourth embodiment of the present invention.

FIG. 8 is a diagram illustrating one method of colorizing a light source.

FIG. 9 is a diagram showing a schematic configuration of a glasses-type portable display using a flat display panel according to the related art.

FIG. 10 is a view showing a schematic configuration of a glasses-type portable display using a method of directly drawing information on a fundus of a wearer by scanning light rays instead of a flat display panel according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glass vine, 2 ... Image signal generator, 3 ... Signal light, 4 ... Reflection optical element, 5 ... Eye of wearer, 6 ... Two-dimensional scanning reflection mirror, 7 ... Pupil projection lens, 8 ... Incident surface, 9: back reflection mirror surface, 10: total reflection surface, refraction exit surface, 11: wearer's eye, 12: pupil, 13: virtual image 14: fundus, 15: crystalline lens, 16: aerial image, 17: Fresnel lens, 18 ... a member formed integrally with the pupil projection lens 7, 19 ... a member formed integrally with the pupil projection lens 7, 20 ... an entrance surface, a refraction exit surface, 21 ... a back reflector having a Fresnel lens.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H087 KA14 KA23 LA12 RA47 TA01 TA04 TA06 5G435 AA01 AA18 BB04 BB16 BB17 BB19 CC09 CC12 DD02 DD05 DD09 DD13 EE13 EE32 FF02 FF03 FF08 FF11 GG08 GG23 GG28 HH09

Claims (3)

[Claims] 1. A display device that can be worn on the head or face of a wearer, comprising: a light beam emitting unit that emits a light beam corresponding to an image signal; and an optical path of the light beam in synchronization with the image signal. A scanning device for two-dimensionally shaping the light beam, and an optical system for reflecting a light beam whose optical path has been shaken by the scanning device on a reflection surface and guiding the light beam to a pupil of the wearer. 2. The display device according to claim 1, wherein the reflection surface of the optical system is formed on a back surface of a transparent member. 3. The display device according to claim 1, wherein the reflection surface of the optical system is a Fresnel reflection surface.