WO2015007201A1

WO2015007201A1 - Wearable flat optical system

Info

Publication number: WO2015007201A1
Application number: PCT/CN2014/082226
Authority: WO
Inventors: 谈顺毅
Original assignee: 江苏慧光电子科技有限公司
Priority date: 2013-07-16
Filing date: 2014-07-15
Publication date: 2015-01-22
Also published as: CN103345065B; CN103345065A

Abstract

A wearable flat optical system, comprising: an imaging system (11) that outputs imaging light rays; a light guidance system (12) that guides the imaging light rays into human eyes; the imaging system (11) has a light source interface, and receives light rays emitted from an external light source (10) via the light source interface and a light transmission medium, and generates the imaging light rays using the light rays from the light source. The wearable flat optical system effectively reduces the volume and weight of the system and improves wearing comfort.

Description

Wearable head-up optical system

The present invention relates to a wearable head-up optical system. Background technique

Currently, wearable electronic products are rapidly evolving, and some products have already begun to be practical applications, such as Google Glass. Products similar to Google Glass belong to a wearable head-up optical system, which mainly includes an imaging system and a light guiding system. The image output by the imaging system is transmitted to the human eye through the light guiding system. In addition, the light guiding system is usually transparent, so Displaying the image does not affect the user's field of view, and achieves the fusion of the virtual scene and the displayed scene.

In the prior art, an imaging system of a head-up optical system is generally integrated with a light source and an electronic chip for generating and outputting an image. The integrated light source and the electronic chip cause the entire head-view optical system to have a large volume and weight, which affects the comfort when worn. Sex and portability. Summary of the invention

The technical problem to be solved by the present invention is to provide a wearable head-up optical system which is advantageous in reducing the volume and weight of the system and improving the comfort in wearing.

In order to solve the above technical problems, the present invention provides a wearable head-up optical system, comprising: an imaging system that outputs imaging light;

a light guiding system, guiding the imaging light to a human eye;

It is characterized in that

The imaging system has a light source interface, and the imaging system receives light source light from an external light source via the light source interface and the light transmission medium, and generates the image light using the light source light.

According to an embodiment of the invention, the light transmission medium is an optical fiber.

According to an embodiment of the invention, the light source interface comprises a wedge shaped light guide or lens system.

According to an embodiment of the invention, the external light source is a laser light source.

According to an embodiment of the invention, the imaging system comprises:

Imaging device Reflecting the transmissive element, directing the light source light to the imaging device by reflection or transmission, and directing the imaging light reflected by the imaging device to the light guiding system through transmission or reflection.

According to an embodiment of the invention, the imaging device displays a holographic image or a real image.

According to an embodiment of the invention, the imaging device is a silicon-based liquid crystal chip or a digital micromirror device. According to an embodiment of the invention, the display data of the imaging device is accessed via an external data line or wirelessly.

According to an embodiment of the invention, the reflective transmission element is a polarizing prism or a transflective prism or a total reflection prism.

According to an embodiment of the invention, the imaging system further comprises: a lens system disposed on a surface of the imaging device, the lens system comprising one or more lenses.

According to an embodiment of the present invention, the light guiding system includes a first dielectric block and a second dielectric block that are attached to each other, and a bonding surface of the first dielectric block and the second dielectric block is a slope and the inclined surface is disposed A transflective film is incident from the first dielectric block, transmitted to the transflective film via the first dielectric block, and reflected by the transflective film to the human eye. According to an embodiment of the present invention, a bonding surface of the first dielectric block and the second dielectric block and the first

- The angle between the surfaces of the medium 3⁄4: satisfies the following relationship: a > arc sin ( ) + 90. , where, for the ηι

The refractive index of the dielectric material used in the first dielectric block, n. The refractive index of the outer dielectric material in contact with the first dielectric block. According to an embodiment of the invention, the incident surface of the imaging ray incident on the light guiding system is curved or curved with a different refractive index to achieve a lens function.

Compared with the prior art, the present invention has the following advantages:

In the wearable head-up optical system of the embodiment of the invention, the imaging system has a light source interface, and the light source interface can be configured to be connected to a light transmission medium such as an optical fiber to introduce light from the external light source for imaging. Since the light source is outside the head-up optical system, it is advantageous to reduce the volume and weight of the system, which is advantageous for improving portability and improving comfort during wearing.

In addition, the display content of the imaging device used on the display surface can also be accessed by an external cable (with soldering) or wirelessly, thereby externally placing the electronic chip, further reducing the size and weight, and simultaneously Reduce the heat generated by the wearing system and improve wearing comfort. The power source for driving the imaging device can also be externally placed. It is then accessed via an external cable (packed with optical solder and communication data lines) to further reduce size and weight while reducing heat generated by the wear system and improving wearing comfort.

Further, in the imaging system of the embodiment of the invention, the imaging device can display the holographic image, and since the holographic image itself can modulate the light, the function of the lens can be realized by software adjustment, and the equivalent of changing the lens by changing the holographic image is realized. The function of the focal length allows the viewer to see images presented at different distances without changing any hardware. DRAWINGS

1 is a schematic view showing the overall structure of a wearable head-up optical system according to an embodiment of the present invention;

2 is a schematic structural view of a first example of a wearable head-up optical system according to an embodiment of the present invention; FIG. 3 is a schematic structural view of a second example of a wearable head-up optical system according to an embodiment of the present invention; FIG. 5 is a schematic structural view of a fourth example of a wearable head-up optical system according to an embodiment of the present invention; FIG. 6 is a schematic view of a head-up optical system of an embodiment of the present invention; A schematic structural view of a fifth example;

7 is a schematic structural view of a sixth example of a head-up optical system according to an embodiment of the present invention;

8 is a schematic structural view of a seventh example of a head-up optical system according to an embodiment of the present invention;

9 is a schematic structural view of an eighth example of a head-up optical system according to an embodiment of the present invention;

10 is a schematic structural view of a light guiding system in a head-up optical system according to an embodiment of the present invention; FIG. 11 is a schematic structural view of another light guiding system in a head-up optical system according to an embodiment of the present invention; FIG. 13 is a schematic structural diagram of still another light guiding system in a head-up optical system according to an embodiment of the present invention. FIG. detailed description

The invention is further described below in conjunction with the specific embodiments and the accompanying drawings, but should not limit the scope of the invention.

Referring to Figure 1, the wearable head-up optical system of the present embodiment includes an imaging system 11 and a light guiding system 12. The imaging system 11 outputs imaging light that is incident on the light guiding system 12 and guided by the light guiding system 12 to the human eye.

Further, the imaging system 11 has a light source interface configured to be optical fiber or the like The light transmission medium is connected, and the light source light emitted from the external light source is introduced into the imaging system 11 via the light transmission medium and the light source interface, and the imaging system 11 generates and outputs the imaging light by using the introduced light source light. The imaging system 11 can adopt any suitable structure in the prior art. Since the light source is located outside the entire head-view optical system, the volume and weight of the outside of the head-up optical system are relatively small, and in addition, the heat generated by the large power of the light source can be avoided. problem.

Wherein, the external light source can be a laser or an LED light source. The light transmission medium may be an optical fiber, but is not limited thereto.

In addition, the light guiding system 12 may be integrated with a transflective film to reflect the imaging light propagating along the light guiding system 12 to the human eye. In addition, the human eye can also see the external reality through the transflective film. Of course, those skilled in the art should understand that the transflective film herein is only an example, and a similar function can be realized by using a polarizing prism, a transflective prism or the like.

Referring to Figure 2, in a first embodiment, the light source interface is implemented using a lens system 15, which may, for example, comprise a fiber collimating mirror. The light source light from the external light source 10 is input via the optical fiber 14 and the lens system 15 for generating imaging light. The external light source 10 can be, for example, a laser light source.

Referring to Fig. 3, in the second embodiment, the light source interface is implemented by a wedge-shaped light guide plate 16, and the light source light from the external light source 10 is input through the optical fiber 14 and the wedge-shaped light guide plate 16 for generating imaging light. The external light source 10 can be, for example, a laser light source.

2 and 3 are merely examples, and those skilled in the art will appreciate that the specific implementation of the light source interface is not limited to a lens system or a wedge-shaped light guide.

Referring to Fig. 4, in a third embodiment, imaging system 11 includes an imaging device 111 and a lens system 112 disposed on a surface of imaging device 1 11 that displays a real image, and lens system 112 includes one or more lenses.

Specifically, the imaging device 11 1 may be, for example, a liquid crystal on silicon (LCoS) or a digital micromirror device (DMD) or a liquid crystal projection chip (LCD chip), etc., and is illuminated by an external light emitting diode (LED) or a laser light source. Image, the image is a real image. The lens system 112 can be formed by a convex lens or a Fresnel lens. In this example, the distance of imaging device 1 11 from lens system 112 can be less than the overall focal length of lens system 112.

The imaging device 11 1 generates imaging light by using the light source of the external light source 10, via the lens system. 1 12 enters the light guide system. The light source light of the external light source 10 enters the imaging device 11 1 via the light transmission medium 14 and the light source interface 17. The light guiding system may include a first dielectric block 121 and a second dielectric block 122 which are bonded to each other, and the bonding surfaces of the two are inclined surfaces, and the inclined surface is provided with a semi-transflective film 13. The material of the first dielectric block 121 and the second dielectric block 122 may be the same; the semi-transparent film 13 may be coated on the bonding surface or may be plated on the bonding surface. The function of the transflective film 13 is to control the transmittance of light incident from the imaging system 1 1 onto the bonding surface (or interface) to form a partial transmissive partial reflection effect, such as 70% transmission, 30% reflection. .

The transflective film 13 reflects the imaged light to the human eye, so that the human eye sees the virtual image surface that is focused at a distance.

Referring to Fig. 5, Fig. 5 shows a fourth embodiment of a head-up optical system, the structure of which is substantially the same as that of the third embodiment. The difference is that, in the fourth embodiment, the materials of the first dielectric block 121 and the second dielectric block 122 in the light guiding system are different.

Referring to Figures 6, Figure 6 shows a fifth embodiment of a head-up optical system. In the fifth embodiment, the imaging system includes an imaging device 41 and a polarizing prism (PBS) 42. The polarizing prism 42 can be integrated in the light guiding system 12, that is, combined with the light guiding system 12.

In the fifth embodiment, the imaging device 41 may be a liquid crystal on silicon (LCoS) or a digital micromirror device (DMD), which displays a holographic image, illuminated by an external light source (such as a laser or an LED light source), and diffraction interference. Post-imaging, since the holographic image (or called the hologram) itself can be adjusted to light, the lens function can be realized by software adjustment. By changing the holographic image, the viewer can see that it is presented without changing any hardware. Images of different distances, so that no lens system can be added to the head-up optical system.

Further, the imaging device 41 is located at one side of the light guiding system 12, and the light source light emitted by the light source is incident from the opposite side of the light guiding system 12 via the light source interface 17. The light emitted by the light source may be polarized light that will pass through when entering the polarizing prism 42 for the first time, illuminating the imaging device 41. The imaging device 41 modulates the light source light emitted by the light source 10 and changes its polarization direction to reflect, and the reflected modulated light enters the polarizing prism 42 again, and since the polarization direction has changed, it will be reflected by the polarizing prism 42 into the light guiding system 12, and The transflective film that propagates within the light directing system 12 to the left side may also be a polarized or non-polarized prism and is reflected into the viewer's eye. Wherein, the light source can be placed outside the imaging system, and the light source is guided by the optical fiber to reduce the volume and weight of the system. Referring to Figure 7, Figure 7 shows a sixth embodiment of a head up optical system. In the sixth embodiment, the imaging system includes an imaging device 51 and a total reflection prism (TIR) 52. The total reflection prism 52 can be integrated in the light guiding system 12, that is, combined with the light guiding system 12.

In the sixth embodiment, the imaging device 51 displays a holographic image, which may be a silicon-based liquid crystal chip (LCoS) or a digital micromirror device (DMD) or a hologram, illuminated by an external light source such as a laser or an LED light source. Imaging after diffraction interference.

Further, the imaging device 51 is located on one side of the light guiding system 12, and the light source light emitted from the light source is incident from the adjacent other side via the light source interface 17. When the light from the light source enters the total reflection prism 52 for the first time, it will be totally reflected to illuminate the imaging device 51. The imaging device 51, such as an imaging chip such as a silicon-based liquid crystal chip or a digital micromirror device, can modulate the light source light emitted by the light source and reflect it, and the reflected modulated light enters the total reflection prism 52 again, since the incident angle has changed, Transmission through the total reflection prism 52 enters the light guide system 12 and propagates within the light guide system 12 to the left semi-transparent film or polarized or non-polarized prism and is reflected into the viewer's eye. Among them, the light source 10 can be placed outside the imaging system, and the illumination light is introduced through the optical fiber, thereby reducing the system volume and weight.

It should be noted that although the imaging device displays a hologram image in the fifth and sixth embodiments, the lens function can be realized by the adjustment of the imaging device itself, but in order to further improve the display effect, the surface of the imaging device can also be set. There is a lens system. In addition, in the fifth and sixth embodiments, the reflective transmission element is a polarizing prism and a total reflection prism, respectively, but is not limited thereto, and the reflective transmission element may also be implemented by a transflective prism or other suitable device. .

Referring to Figures 8, Figure 8 shows a seventh embodiment of a head up optical system. In a seventh embodiment, the imaging system includes a light source interface 16 (specifically a wedge shaped light guide), an imaging device 51 and a polarizing prism (PBS) 42, lens system 112. The polarizing prism 42 and the lens system 1 12 may be integrated in the light guiding system 12, that is, combined with the light guiding system 12.

In the seventh embodiment, the imaging device 51 displays a real image, which may be a liquid crystal on silicon (LCoS) or a digital micromirror device (DMD), illuminated by an external light source 10 such as a laser or an LED light source.

Further, the imaging device 51 is located on one side of the light guiding system 12, and the light source light emitted from the light source 10 is incident from the light source interface 16 (wedge light guide plate) located on the opposite side of the light guiding system 12. The light emitted by the light source 10 may be polarized light that will pass through when entering the polarizing prism 42 for the first time, illuminating the imaging device 51. The imaging device 51 modulates the light source light emitted by the light source 10 and changes its polarization direction After the reflected modulated light enters the polarizing prism 42 again, the polarization direction has changed, and will be reflected by the polarizing prism 42 into the lens system. The two sides of the lens system are glued to the surface of the light guiding system 12 and the polarizing prism 42 respectively, and the light is guided. The transflective film that propagates into the left side of system 12 can also be a polarized or non-polarized prism and is reflected into the viewer's eye. Wherein, the light source 10 can be placed outside the imaging system, and the light source light is introduced by means of an optical fiber, thereby reducing the system volume and weight.

Referring to Figures 9, Figure 9 shows an eighth embodiment of a head-up optical system. In the eighth embodiment, the imaging system includes an imaging device 51, a polarizing prism (PBS) 42, a light source interface 15 (specifically, a lens system), a curved mirror 112, and an 1/4 slide 113. The polarizing prism 42 can be integrated in the light guiding system 12, that is, combined with the light guiding system 12. Further, an imaging system is disposed at one end of the light guiding system 12, and a curved mirror 1 12 and an 1/4 glass slide 113 are disposed at the other end of the light guiding system 12.

In the eighth embodiment, the imaging device 51 displays a real image, which may be a liquid crystal on silicon (LCoS) or a digital micromirror device (DMD), illuminated by an external light source 10 such as a laser or an LED light source.

Further, the imaging device 51 is located on one side of the light guiding system 12, and the light source light from the light source 10 is incident from the light source interface 15 (lens system) located on the opposite side of the light guiding system 12. The light emitted by the light source 10 may be polarized light that will pass through the polarizing prism 42 for the first time, illuminating the imaging device 51. The imaging device 51 modulates the light source light emitted by the light source 10 and changes its polarization direction to reflect. After the reflected modulated light enters the polarizing prism 42 again, the polarization direction has changed, and the polarized light is reflected by the polarizing prism 42 into the light guiding system 12, and the light is reflected. The polarizing prism that propagates to the left side in the light guiding system 12 will pass through when it is incident on the polarizing prism for the first time, and is reflected and modulated by the curved mirror 112 after passing through the 1/4 glass slide 13 and once again 1/4 glass. After the sheet 113 is again incident on the polarizing prism, since its polarization direction has been changed by the 1/4 slide 113, the light will be reflected into the viewer's eye. Wherein, the light source 10 can be placed outside the imaging system, and the light source light is introduced by means of an optical fiber, thereby reducing the system volume and weight.

The light guiding system in the head-up optical system will be described in detail below with reference to a plurality of examples.

Referring to FIG. 10, in the first example, the light guiding system includes a first dielectric block 121 and a second dielectric block 122 that are attached to each other, and the light guiding system is planar near the end surface of the imaging system, that is, the first dielectric block 121. The end face incident on the imaging ray is perpendicular to the outer surface (or side). The bonding surface of the first dielectric block 121 and the second dielectric block 122 is a slope, that is, the bonding surface is not perpendicular to the outer surface (or side surface) of the first dielectric block 121 and the second dielectric block 122. The angle α between the bonding surface of the first dielectric block 121 and the second dielectric block 122 and the outer surface of the first dielectric block 121 satisfies The following relationship: _{a > arcS} m( ) + 90. Wherein, is the refractive index of the dielectric material used by the first dielectric block 121, n. The refractive index of the external dielectric material (for example, air or a film disposed on the outer surface of the first dielectric block 121) in contact with the first dielectric block 121. The transmissive surface of the first dielectric block 121 and the second dielectric block 122 may be provided with a transflective film to achieve partial transmissive partial reflection. For details on the transflective film, please refer to the related description above, and I will not repeat them here. In addition, a similar function can be achieved by using a transflective prism or a polarizing prism.

Referring to FIG. 1 1, in the second example, the light guiding system includes a first dielectric block 121 and a second dielectric block 122 that are attached to each other, and the light guiding system is inclined to the end surface 71 of the imaging system, that is, the first dielectric block. 121 The end face 71 for imaging light incident is not perpendicular to the outer surface (or side). The incident surface adopts a slope, which can effectively increase the incident area of the imaging light.

Referring to FIG. 12, in the third example, the light guiding system includes a first dielectric block 121 and a second dielectric block 122 that are attached to each other, and the light guiding system is curved near the end surface 81 of the imaging system or a curved surface having a different refractive index. To achieve the lens function. Further, in the third embodiment, the end face 81 is a concave curved surface.

Referring to FIG. 13, in the fourth example, the light guiding system includes a first dielectric block 121 and a second dielectric block 122 that are attached to each other, and the end surface of the light guiding system opposite to the imaging system is disposed (for example, by gluing). /4 slide 92 and curved mirror 91, when the light from the imaging system is incident on the polarizing prism for the first time, it will pass through, after passing through the 1/4 slide 92, it will be reflected and modulated by the curved mirror 91, once again The 1/4 slide 92 is again incident on the polarizing prism, and since its polarization has been changed by the 1/4 slide 92, the light will be reflected into the viewer's eye. Further, in the fourth example, the light guide system is glued to the end face of the imaging system to have a 1/4 slide 92 and a polarizing prism 91.

It should be noted that, in the third and fourth examples, when the end surface of the light guiding system adopts a curved surface structure to realize the lens function, other lenses may be integrated in the imaging system to improve the imaging effect, or the lens may not be disposed in the imaging system. Use only the curved surface of the light guide system to achieve the lens function.

In addition, the light guiding system can be made into a frosted structure or coated with a black paint or film layer away from the end surface of the imaging system. In other words, the end surface of the other end of the light guiding system opposite to the incident surface of the imaging light can be made into a frosted structure or coated with black paint. Or film layer.

In summary, the wearable head-up optical system of the embodiment can be made into a product similar to glasses, The holographic imaging method allows the image seen by the user to be displayed farther than the actual distance, thereby reducing visual fatigue; in addition, the image surface is translated by a transparent light guiding system without blocking the light on the front side of the human eye to form a transparent display. System, the realization of the fusion of virtual scenes and realistic scenes.

The present invention has been disclosed in the above preferred embodiments, but it is not intended to limit the invention, and the present invention may be made without departing from the spirit and scope of the invention. The scope of protection should be determined by the scope defined by the claims of the present invention.

Claims

Rights request

1. A wearable head-up optical system, including:

Imaging system, outputs imaging light;

A light guide system to guide the imaging light to the human eye;

It is characterized by:

The imaging system has a light source interface. The imaging system receives light source light emitted by an external light source via the light source interface and the light transmission medium, and uses the light source light to generate the imaging light.

2. The head-up optical system according to claim 1, characterized in that the light transmission medium is an optical fiber.

3. The head-up optical system according to claim 1, characterized in that the light source interface includes a wedge-shaped light guide plate or a lens system.

4. The head-up optical system according to claim 1, wherein the external light source is a laser light source.

5. The head-up optical system according to claim 1, wherein the imaging system includes: an imaging device;

The reflective and transmissive element guides the light source light to be incident on the imaging device through reflection or transmission, and guides the imaging light reflected by the imaging device to be incident on the light guide system through transmission or reflection.

6. The head-up optical system according to claim 5, characterized in that the imaging device displays a holographic image or a real image.

7. The head-up optical system according to claim 5, wherein the imaging device is a silicon-based liquid crystal chip or a digital micromirror element.

8. The head-up optical system according to any one of claims 5 to 7, characterized in that the display data of the imaging device is accessed through an external data line or wirelessly.

9. The head-up optical system according to claim 5, characterized in that the reflective and transmissive element is a polarizing prism, a semi-transparent and semi-reflective prism or a total reflection prism.

10. The head-up optical system according to claim 5, characterized in that the imaging system further includes: a lens system provided on the surface of the imaging device, the lens system including one or more lenses.

1 1. The head-up optical system according to claim 1, characterized in that, the light guide system includes a first dielectric block and a second dielectric block that are attached to each other, and the first dielectric block and the second dielectric block are The bonding surface is an inclined surface and a semi-reflective and semi-transparent film is provided on the inclined surface. The imaging light is incident from the first dielectric block, is transmitted to the semi-reflective and semi-transparent film through the first dielectric block, and is transmitted by the Transflective films reflect to the human eye.

12. The head-up optical system according to claim 12, wherein the angle ≤ between the fitting surface of the first dielectric block and the second dielectric block and the outer surface of the first dielectric block satisfies the following: Relationship: a _{> arcS} m^¾ + 90. , where is the refractive index of the dielectric material used in the first dielectric block, n _Q is the refractive index of the external dielectric material in contact with the first dielectric block.

13. The head-up optical system according to claim 1, characterized in that the incident surface of the imaging light incident on the light guide system is a curved surface or a curved surface glued with different refractive index to realize the lens function.