CN106896500B

CN106896500B - Display device

Info

Publication number: CN106896500B
Application number: CN201510960422.8A
Authority: CN
Inventors: 黄俊杰
Original assignee: Delta Electronics Inc
Current assignee: Delta Electronics Inc
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2020-10-16
Anticipated expiration: 2035-12-18
Also published as: CN106896500A

Abstract

A display device comprises a left eye block and a right eye block. The left eye block and the right eye block respectively comprise a micro reflection unit, a relay unit and an eyepiece unit. The micro reflection unit comprises a plurality of micro reflection lenses and is used for controlling the deflection angles of the micro reflection lenses according to the electric signals so as to convert the light source into an input image. The relay unit comprises at least one first optical lens, and is used for receiving the light beam of the input image and amplifying the input image through the first optical lens to generate a relay image. The eyepiece unit comprises at least one second optical lens, and is used for receiving the light beam of the relay image and converging the light beam of the relay image through the second optical lens to generate an output image for a user to watch.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a display device using micro mirrors.

Background

A Head Mounted Display (HMD), which is an optical product for stereoscopic display, uses a stereoscopic effect signal of binocular parallax to generate a stereoscopic image by passing through the HMD and the optical components to the two eyes respectively. The user wears the head-mounted display on the head, and two eyes respectively use a small screen, so that the stereoscopic effect of a large image can be generated.

Head-mounted displays are commonly used in Augmented Reality (AR) or Virtual Reality (VR) systems, which move with the user and act as an input device to receive the user's responses. Through the head-mounted display worn on the head of the user, images and characters can be added to the picture generated by the user observing the surrounding environment, so as to achieve the effect of virtual reality or augmented reality.

However, the current head-mounted display is not only too bulky, but also too energy-consuming because the optical components thereof employ beam splitters (beamsplitters), so that how to reduce the volume of the head-mounted display and use energy effectively becomes an important issue.

Disclosure of Invention

The present invention is directed to a display device using micro mirrors, which overcomes the above-mentioned drawbacks of the prior art.

In order to achieve the above object, the present invention provides a display device. The display device comprises a left eye block and a right eye block. The left eye block and the right eye block respectively comprise a micro reflection unit, a relay unit and an eyepiece unit. The micro reflection unit comprises a plurality of micro reflection lenses and is used for controlling the deflection angles of the micro reflection lenses according to the electric signals so as to convert the light source into an input image. The relay unit comprises at least one first optical lens, and is used for receiving the light beam of the input image and amplifying the input image through the first optical lens to generate a relay image. The eyepiece unit comprises at least one second optical lens, and is used for receiving the light beam of the relay image and converging the light beam of the relay image through the second optical lens to generate an output image for a user to watch.

The invention has the technical effects that:

the display device of the invention does not have energy loss caused by light beam splitting of output images generated by the optical lenses in the relay unit and the ocular unit, and the size of the display device is further reduced and the aberration phenomenon of the output images is reduced by the arrangement of the optical lenses.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a left-eye block of the display device in FIG. 1.

Wherein the reference numerals

100 display device

100L left eye block

100R right eye block

110 micro reflection unit

112 total reflection prism

120 relay unit

130 eyepiece unit

E light source

Iin input image

Imid relay image

Iout output image opening (Aperture)

U1 user

P1 first positive lens group

N1 first negative lens group

N2 second negative lens group

S1 first reflector

S2 second mirror

A1 first convex lens

A2 second convex lens

A3 third convex lens

A4 fourth convex lens

A5 fifth convex lens

A6 sixth convex lens

A7 seventh convex lens

B1 first concave lens

B2 second concave lens

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

the following provides many different embodiments or illustrations for implementing different features of the invention. The elements and configurations of the specific examples are used in the following discussion to simplify the present invention. Any examples discussed are intended for illustrative purposes only and do not limit the scope or meaning of the invention or its illustrations in any way. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are included for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed below.

The term (terms) used throughout the specification and claims has the ordinary meaning as commonly understood in the art, in the context of the invention, and in the context of the particular claim, unless otherwise indicated. Certain terms used to describe the invention are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the invention.

As used herein, to "couple" or "connect" may mean that two or more elements are in direct physical or electrical contact with each other, or in indirect physical or electrical contact with each other, and "couple" or "connect" may also mean that two or more elements are in operation or act with each other. It will be understood that the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections. These elements, components, regions, layers and/or regions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. As used herein, the word "and/or" includes any combination of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic diagram of a display device 100 according to an embodiment of the disclosure. The display device 100 may be a head-mounted display or any display device applied to Augmented Reality (AR) or Virtual Reality (VR), and for convenience of description, the head-mounted display will be taken as an example, but the invention is not limited in this application. As shown in fig. 1, the display device 100 includes a left-eye block 100L and a right-eye block 100R. The left-eye block 100L and the right-eye block 100R each include a micro-reflective unit 110, a relay unit 120, and an eyepiece unit 130.

The micro reflective unit 110 includes a plurality of micro mirrors (not shown), and the micro reflective unit 110 is configured to control a deflection angle of the micro mirrors according to an electrical signal to convert the light source E into an input image Iin. The micro reflective unit 110 may be a Digital micro mirror Device (DMD) or any other display that converts a light source into an input image, but the invention is not limited thereto. Further, referring to fig. 2, fig. 2 is a schematic diagram of a left-eye block 100L of the display device 100 in fig. 1. For convenience of description, the left-eye block 100L of the display device 100 is taken as an example, and the right-eye block 100R of the display device 100 actually operates similarly to the left-eye block 100L of the display device 100.

As shown in fig. 2, in some embodiments, the display device 100 further includes a total reflection prism 112 disposed between the micro reflective unit 110 and the relay unit 120 for guiding the light beam of the light source E to the micro reflective unit 110, wherein the micro reflective unit 110 includes micro reflective mirrors, and each of the micro reflective mirrors can adjust the amount of reflected light through different deflection angles, for example, the micro reflective mirror rotates by-12 degrees in the darkest case and rotates by +12 degrees in the brightest case. Therefore, the micro-reflective unit 110 can control the deflection angle of the micro-reflective mirror according to different electrical signals to convert the light source E into the input image Iin.

The relay unit 120 includes at least one first optical lens, and the relay unit 120 is configured to receive the light beam of the input image Iin and amplify the input image Iin through the first optical lens to generate a relay image Imid.

As shown in fig. 2, the at least one first optical lens includes a first positive lens group P1, a first mirror S1, a first negative lens group N1 and a second mirror S2, wherein the light beam of the input image Iin is transmitted to the first mirror S1 through the first positive lens group N1, reflected to the first negative lens group N1 through the first mirror S1, transmitted to the second mirror S2 through the first negative lens group N1, and reflected by the second mirror S2 to form a relay image Imid.

In this embodiment, the first positive lens group N1 includes a first convex lens a1 and a second convex lens a2, wherein the light beam of the input image Iin is transmitted to the second convex lens a2 through the first convex lens a1, and then transmitted to the first mirror S1 through the second convex lens a 2. In this embodiment, the first negative lens group N1 includes a third convex lens A3 and a first concave lens B1, wherein the light beam of the input image Iin is reflected to the third convex lens A3 via the first mirror S1, transmitted to the first concave lens B1 via the third convex lens A3, and transmitted to the second mirror S2 via the first concave lens B1. It should be noted that the third convex lens A3 in the first negative lens group N1 may be crown glass (crown glass) or other optical glass with low refractive index (refractionindex) and high Abbe number (Abbe number), and the first concave lens B1 may be flint glass (flintglass) or other optical glass with high refractive index and low Abbe number.

In addition, the positive lens group and the subsequent positive lens group in the present invention are any lenses capable of converging light beams, and the negative lens group is any lens capable of diverging light beams, which is not limited to the above embodiments. Specifically, after the input image Iin is refracted and magnified by the at least one first optical lens to form the relay image imin, each point of the relay image imin is converted into a parallel light beam in each direction by the eyepiece unit 130, and the parallel light beam is converged at the pupil of the user U1 (i.e., an opening Iout where an output image is formed and enters the output image). In this embodiment, the first mirror S1 and the second mirror S2 are disposed such that the optical axis of the first positive lens group P1 is parallel to the optical axis of the at least one second optical lens. As shown in FIG. 2, the first mirror S1 and the second mirror S2 are disposed such that the optical axis of the first positive lens group P1 is perpendicular to the optical axis of the first negative lens group N1, and the optical axis of the first negative lens group N1 is perpendicular to the optical axis of the at least one second optical lens. For example, the first mirror S1 and the optical axis of the first positive lens group P1 may be arranged at an angle of 45 degrees, and the first mirror S1 and the second mirror S1 may be arranged perpendicular to each other. In still another example, the first mirror S1 may be disposed at an angle of 30 degrees from the optical axis of the first positive lens group P1, and the first mirror S1 and the second mirror S1 may also be disposed perpendicular to each other such that the optical axis of the first positive lens group P1 is parallel to the optical axis of the at least one second optical lens. Therefore, through the arrangement of the two reflectors (the first reflector S1 and the second reflector S2), the optical axis of the first positive lens group P1 is parallel to the optical axis of the at least one second optical lens, so that the space can be properly utilized to greatly reduce the size of the display device 100.

Then, since the magnified relay image Imid has an undesirable aberration phenomenon (optical aberration), the aberration needs to be further removed by the eyepiece unit 130. As shown in fig. 2, the eyepiece unit 130 includes at least one second optical lens, and the eyepiece unit 130 is configured to receive the light beam of the relay image Imid, and converge the light beam of the relay image Imid through the second optical lens to generate an output image, which enters the opening Iout of the output image for the user U1 to view.

In this embodiment, the at least one second optical lens includes a fourth convex lens a4, a second negative lens group N2, a fifth convex lens a5 and a sixth convex lens a6, wherein the light beam of the relay image Imid is transmitted to the second negative lens group N2 through the fourth convex lens a4, then transmitted to the fifth convex lens a5 through the second negative lens group N2, then transmitted to the sixth convex lens a6 through the fifth convex lens a5, and then transmitted through the sixth convex lens a6 to form an output image, which enters the opening Iout of the output image. In this embodiment, the second negative lens group N2 includes a second concave lens B2 and a seventh convex lens a7, wherein the light beam of the relay image Imid is transmitted to the second concave lens B2 through the fourth convex lens a4, then transmitted to the seventh convex lens a7 through the second concave lens B2, and then transmitted to the fifth convex lens a5 through the seventh convex lens a 7. Similarly, the seventh convex lens a7 in the second negative lens group N2 may be crown glass (crown glass) or other optical glass with low refractive index (diffraction index) and high Abbe number (Abbe number), and the second concave lens B2 may be flint glass (flint glass) or other optical glass with high refractive index and low Abbe number. Therefore, the aberration phenomenon in the output image is reduced through the arrangement of the at least one second optical lens.

In addition, the curvature design of each optical lens of the at least one second optical lens further affects the aberration in the output image. Preferably, as shown in fig. 2, the fourth convex lens a4 has a convex, flat or concave first surface and a convex second surface, i.e. the radius of curvature of the first surface of the fourth convex lens a4 should be smaller than the radius of curvature of the second surface. The light beam of the relay image Imid is transmitted to the second surface of the fourth convex lens a4 through the first surface of the fourth convex lens a4, and is transmitted to the second negative lens group N2 through the second surface of the fourth convex lens a 4.

The second concave lens B2 has a convex or flat first surface and a concave second surface, and the seventh convex lens a7 has a convex or convex first surface and a convex, flat or concave second surface, i.e., the radius of curvature of the first surface of the second concave lens B2 should be smaller than that of the second surface thereof, and the radius of curvature of the first surface of the seventh convex lens a7 should be larger than that of the second surface thereof. The light beam of the relay image Imid is transmitted to the first surface of the second concave lens B2 through the fourth convex lens a4, transmitted to the second surface of the second concave lens B2 through the first surface of the second concave lens B2, transmitted to the first surface of the seventh convex lens a7 through the second surface of the second concave lens B2, transmitted to the second surface of the seventh convex lens a7 through the first surface of the seventh convex lens a7, and transmitted to the fifth convex lens a5 through the second surface of the seventh convex lens a 7.

The fifth convex lens a5 has a convex first surface and a convex, flat or concave second surface, i.e. the radius of curvature of the first surface of the fifth convex lens a5 should be larger than the radius of curvature of the second surface. The light beam of the relay image Imid is transmitted to the first surface of the fifth convex lens a5 through the second negative lens group N2, transmitted to the second surface of the fifth convex lens a5 through the first surface of the fifth convex lens a5, and transmitted to the sixth convex lens a6 through the second surface of the fifth convex lens a 5.

The sixth convex lens a6 has a convex first surface and a convex, flat or concave second surface, i.e. the radius of curvature of the first surface of the sixth convex lens a6 should be larger than the radius of curvature of the second surface. The light beam of the relay image Imid is transmitted to the first surface of the sixth convex lens a6 through the sixth convex lens a6, transmitted to the second surface of the sixth convex lens a6 through the first surface of the sixth convex lens a6, and transmitted through the second surface of the sixth convex lens a6 to form an output image, and enters the opening Iout of the output image. Therefore, the aberration phenomenon in the output image Iout can be further reduced through the arrangement of the embodiment.

In summary, the display device of the present invention generates an output image through the optical lenses of the relay unit and the eyepiece unit without energy loss due to light beam splitting, and the arrangement of the optical lenses further reduces the size of the display device and reduces the aberration of the output image.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A display device, comprising:

a left-eye block and a right-eye block each comprising:

the micro reflection unit comprises a plurality of micro reflection lenses and is used for controlling the deflection angles of the micro reflection lenses according to the electric signals so as to convert a light source into an input image;

a relay unit including at least one first optical lens, the relay unit being configured to receive the light beam of the input image and to generate a relay image by magnifying the input image through the at least one first optical lens; and

the eyepiece unit comprises at least one second optical lens, and is used for receiving the light beam of the relay image and converging the light beam of the relay image through the at least one second optical lens to generate an output image for a user to watch;

wherein the at least one first optical lens comprises a first positive lens set, a first reflector, a first negative lens set and a second reflector, wherein the light beam of the input image is transmitted to the first reflector through the first positive lens set, then reflected to the first negative lens set through the first reflector, then transmitted to the second reflector through the first negative lens set, and then reflected by the second reflector to form the relay image;

the first positive lens group comprises a first convex lens and a second convex lens, wherein the light beam of the input image is transmitted to the second convex lens through the first convex lens and then transmitted to the first reflector through the second convex lens;

the first negative lens group comprises a third convex lens and a first concave lens, wherein the light beam of the input image is reflected to the third convex lens through the first reflector, then is transmitted to the first concave lens through the third convex lens, and then is transmitted to the second reflector through the first concave lens;

the relay image is a light spot convergent image of the amplified input image, the input image is refracted and amplified into the relay image through at least one first optical lens, each point of the relay image is converted into parallel light beams in each direction through the ocular lens unit, and the output image is formed and enters the opening of the output image; the first reflector and the second reflector are arranged to enable the optical axis of the first positive lens group to be parallel to the optical axis of at least one second optical lens;

the at least one second optical lens includes a fourth convex lens, a second negative lens group, a fifth convex lens and a sixth convex lens, wherein the light beam of the relay image is transmitted to the second negative lens group through the fourth convex lens, then transmitted to the fifth convex lens through the second negative lens group, then transmitted to the sixth convex lens through the fifth convex lens, and then transmitted through the sixth convex lens to form the output image.

2. The display apparatus according to claim 1, wherein the first reflector and the second reflector are disposed such that an optical axis of the first positive lens group is perpendicular to an optical axis of the first negative lens group, and an optical axis of the first negative lens group is perpendicular to an optical axis of the at least one second optical lens.

3. The display apparatus according to claim 1, wherein the fourth convex lens has a first surface being convex, flat or concave, and a second surface being convex, wherein the light beam of the relayed image is transmitted through the first surface of the fourth convex lens to the second surface of the fourth convex lens, and then through the second surface of the fourth convex lens to the second negative lens group.

4. The display apparatus according to claim 1, wherein the fifth convex lens has a first surface being convex and a second surface being convex, flat or concave, and wherein the light beam of the relayed image is transmitted through the second negative lens group to the first surface of the fifth convex lens, then through the first surface of the fifth convex lens to the second surface of the fifth convex lens, and then through the second surface of the fifth convex lens to the sixth convex lens.

5. The display device of claim 1, wherein the sixth convex lens has a first surface being convex and a second surface being convex, flat or concave, and wherein the light beam of the relayed image is transmitted through the fifth convex lens to the first surface of the sixth convex lens, then through the first surface of the sixth convex lens to the second surface of the sixth convex lens, and then through the second surface of the sixth convex lens to form the output image.

6. The display apparatus of claim 1, wherein the second negative lens group comprises a second concave lens and a seventh convex lens, wherein the light beam of the relayed image is transmitted to the second concave lens through the fourth convex lens, then to the seventh convex lens through the second concave lens, and then to the fifth convex lens through the seventh convex lens.

7. The display device according to claim 6, wherein the second concave lens has a first surface being convex or flat, a second surface being concave, the seventh convex lens has a first surface being convex and a second surface being convex, flat or concave, wherein the light beam of the relayed image is transmitted through the fourth convex lens to the first surface of the second concave lens, then through the first surface of the second concave lens to the second surface of the second concave lens, then through the second surface of the second concave lens to the first surface of the seventh convex lens, then through the first surface of the seventh convex lens to the second surface of the seventh convex lens, and then through the second surface of the seventh convex lens to the fifth convex lens.