CN113376841A

CN113376841A - Display system

Info

Publication number: CN113376841A
Application number: CN202110764314.9A
Authority: CN
Inventors: 黄上育
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-09-10
Also published as: TW202303223A; TWI872265B

Abstract

A display system, comprising: a display device having a display surface for emitting image light; and a first lens assembly, including: a first lens disposed on the optical path of the image light for focusing all the image light; and a light blocking layer disposed on one side of the first lens, the light blocking layer is used for absorbing part of the image light and absorbing external light beams. The above arrangement of the light blocking layer of the display system can effectively improve the ghost phenomenon and enhance the visual experience of the user.

Description

Display system

Technical Field

The invention relates to the technical field of display, in particular to a display system.

Background

Virtual reality (virtual reality) technology has been rapidly developed in the fields of military affairs, construction, tourism, movie, multimedia, and electronic contests. Devices that apply Virtual Reality technology may be classified as either Virtual Reality (VR) devices or Augmented Reality (AR) devices. These devices include Display devices under development, such as Head Mounted Display (HMD). In the head-mounted display device, the image beam is emitted by the display device and then transmitted to the eyes of the user through the lens. However, some of the Image beams are easily reflected by the lens and the display device during transmission, so that the user can view unnecessary Image information, i.e. Ghost Image (Ghost Image). On the other hand, the planar structure of the lenses constituting the lens is generally circular, and the lenses have an inner circle near the center of a circle and an outer circle surrounding the inner circle. When the lens is manufactured, the outer ring of the lens is difficult to process compared with the inner ring, and the outer ring of the lens is easy to have mechanism errors. Light having a higher frequency than that when the light beam is transmitted from the portion inside the lens is easily generated when the light beam is transmitted from the outer circumference of the lens, further increasing the ghost effect and causing a larger contrast of the image of the portion transmitted to the human eye, resulting in a reduced sense of immersion of the user in the virtual reality.

Disclosure of Invention

In view of the above, it is desirable to provide a display system, thereby solving the above problems.

The present application provides a display system comprising:

a display device having a display surface for emitting image light; and

a first lens assembly comprising:

a first lens disposed on a light path of the image light to focus the image light; and

and the light blocking layer is arranged on one side of the first lens and is used for absorbing part of the image light and absorbing external light beams.

The display system comprises a display device, a first lens and a light blocking layer, wherein the display device is used for emitting image light, the first lens is used for receiving the image light, part of the image light received by the first lens is easy to form high-frequency stray light to cause a ghost phenomenon, and the light blocking layer is used for absorbing the stray light.

Drawings

Fig. 1 is a schematic structural diagram of a display system according to a first embodiment of the present application.

Fig. 2 is a schematic plan view of the second surface of the first lens in fig. 1.

Fig. 3 is a schematic structural diagram of a display system according to a second embodiment of the present application.

Fig. 4 is a schematic structural diagram of a display system according to a third embodiment of the present application.

Description of the main elements

Display system

100, 200, 300

Display device 10

First lens assembly 20

Second lens assembly 30

First lens 21

Second lens 31

Focusing part 32

First surface 211

Second surface 212

First anti-reflection layer 213

Semi-reflective film 214

Light blocking layers

215, 315

First region 216

Second region 217

Reflective polarizer 22

Quarter-

wave plates

13, 23

First linear polarizer 33a

Second linearly polarizing plate 33b

Second antireflection layer 34

Display surface 11

Third linear polarizer 12

Optical axes

131, 231

Image light L1

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The display system provided by the embodiment of the application comprises:

a display device having a display surface for emitting image light; and

a first lens assembly comprising:

The display system is described in detail below by way of examples.

Example one

Referring to fig. 1, a display system 100 according to a first embodiment of the present application includes: display device 10, first lens assembly 20, and second lens assembly 30. The display device 10 has a display surface 11, and the display surface 11 emits image light L1. In the present embodiment, the Display device 10 may be a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED), or other types of Display devices, but not limited thereto. In the present embodiment, the image light L1 carries image information, and the image light L1 can also be referred to as an image beam.

The first lens assembly 20 is disposed on the optical path of the image light L1 and spaced apart from the display device 10, and includes a first lens 21. The first lens 21 is disposed on the optical path of the image light L1. The first lens 21 has a first surface 211 facing the display device 10 and a second surface 212 facing away from the display device 10. Referring to fig. 2, the second surface 212 includes a first region 216 and a second region 217 that are mutually spliced, and the second region 217 surrounds the first region 216, i.e., the second region 217 is closer to the outer edge of the first lens 21 than the first region 216. The first lens 21 is for focusing the image light L1. In the present embodiment, the first lens 21 may be a single lens or a combination of a plurality of lenses.

When the lens is applied to an optical path system of VR or AR, light transmitted from a portion inside the lens is relatively stable low-frequency light, but when a light beam is transmitted from a portion outside the lens, high-frequency light is easily generated, and the high-frequency light causes a reduction in contrast of a partial image transmitted to human eyes, thereby causing a reduction in the sense of immersion of a user in virtual reality. In the present embodiment, the portion of the image light L1 transmitted from the second region 217 of the first lens 21 generally includes stray light. This stray light causes the image light L1 to enter the human eye, which causes the human eye to perceive a portion of the image with reduced contrast, thereby causing a user to experience a reduced sense of immersion in the virtual reality. When an external light flux entering the display system 100 from the external environment other than the image light is transmitted through the second region 217 of the first lens 21, high-frequency light is generated, and the contrast of a video transmitted to the human eyes is reduced, which reduces the sense of immersion of the user in the virtual reality. To solve the above problem, referring to fig. 1 and fig. 2, in the present embodiment, the first lens assembly 20 further includes a light blocking layer 215, and the light blocking layer 215 is located on the second area 217 of the second surface 212. The light blocking layer 215 is used to absorb a part of the image light L1 passing through the second region 217 and absorb an external light beam passing through the second region 217 to prevent the part of the image light L1 and the external light beam from being transmitted through the second region 217.

Since there is an air gap between the display device 10 and the first lens 21, which has a light reflectance of about 4%, the image light L1 is reflected when passing through the air gap, which may result in a decrease in light flux in the display system 100, and ultimately in insufficient brightness of the image. In this embodiment, the first lens assembly 20 further includes a first anti-reflection layer 213, the first anti-reflection layer 213 is disposed on the first surface 211 of the first lens 21, and the first anti-reflection layer 213 is disposed on the first surface 211 and can effectively reduce the reflection of the image light L1 emitted from the display device 10 by the first lens 21, so as to increase the light flux in the system. The first antireflection layer 213 may be an interference film that allows the image light L1 to interfere, or may be another kind of antireflection layer.

The first lens assembly 20 further includes a semi-reflective film 214, the semi-reflective film 214 is disposed on the second surface 212 of the first lens 21, when the image light L1 is incident on the semi-reflective film 214, a part of the image light L1 is reflected by the semi-reflective film 214, and the image light L1 that is not reflected is transmitted through the semi-reflective film 214. The semi-reflective film 214 may be made of a material that reflects light and transmits light, such as metal, but not limited thereto.

The first lens assembly 20 further includes a reflective polarizer 22 and a quarter wave plate 23. The reflective polarizer 22 is disposed between the first lens 21 and the second lens assembly 30, the reflective polarizer 22 having a polarization direction, and the reflective polarizer 22 may transmit the image light L1 having the same polarization direction as the reflective polarizer 22 and reflect the image light L1 having a polarization direction different from the polarization direction of the reflective polarizer 22. The quarter-wave plate 23 is disposed between the first lens 21 and the reflective polarizer 22, and the quarter-wave plate 23 is configured to convert the image light L1 incident on the quarter-wave plate 23 from circularly polarized light to linearly polarized light or convert the image light L1 from linearly polarized light to circularly polarized light. In order to satisfy the condition of converting linearly polarized light into circularly polarized light, it is necessary to set the angle between the optical axis 231 of the quarter-wave plate 23 and the polarization direction of the reflective polarizer 22 to be 45 °.

The second lens assembly 30 is disposed on the optical path of the image light L1 emitted from the first lens assembly 20, and is configured to transmit the image light L1 emitted from the first lens assembly 20 for filtering and adjusting the focal length of the image light L1 emitted from the first lens assembly 20 to display the VR image or the AR image. The second lens assembly 30 includes a second lens 31 and a focusing part 32. The second lens 31 is disposed on the optical path of the image light L1 emitted from the first lens assembly, and is used for transmitting and focusing the image light L1 emitted from the first lens assembly 20. In this embodiment, the second lens 31 may be a single lens or a combination of a plurality of lenses, and the second lens 31 may further include other optical components besides the lens, but is not limited thereto.

The focusing unit 32 is disposed on the optical path of the image light L1 transmitted through the second lens 31. The focusing unit 32 is used to adjust the focal length of the display system 100, and the focusing unit 32 may be other elements capable of adjusting the focal length of the optical path, such as a liquid crystal lens, and the focusing unit 32 is used as a liquid crystal lens in the present embodiment, but the present invention is not limited thereto. In this embodiment, the focusing unit 32 is composed of two glass substrates and liquid crystal molecules, and when an electric field is applied to the glass substrates, the liquid crystal molecules change direction, so that light rays transmitted from the lens can be refocused. The focusing section 32 can make the display system 100 realize auto-focusing and zooming without equipping mechanical parts, and the control voltage is low, avoiding waste of electric energy. In the present embodiment, the focusing unit 32 electrically drives to adjust the focal length of the display system 100, and the focusing unit 32 may perform focusing with a single element structure or with a combination of multiple element structures, but is not limited thereto.

By arranging the focusing part 32, the user can adjust the focal length of the display system 100 according to actual conditions so as to meet the requirements of the user on images with different focal lengths.

The second lens assembly 30 further comprises a first linear polarizer 33a and a second linear polarizer 33 b. The first linearly polarizing plate 33a is disposed between the second lens 31 and the focusing section 32, and is disposed on the optical path of the image light L1 transmitted from the focusing section 32. The first linear polarizer 33a has a polarization direction, can transmit the image light L1 with the same polarization direction as the first linear polarizer 33a, and can absorb the image light L1 with the polarization direction different from the first linear polarizer 33a, and by the arrangement of the first linear polarizer 33a, the stray light generated by the back-and-forth reflection between the reflective polarizer 22 and the lens in the display system 100 can be blocked, so as to significantly improve the ghost phenomenon and improve the visual effect. The second polarizer 33b is disposed on the light-emitting path of the focusing unit 32, and is used for blocking stray light generated after the image light L1 passes through the focusing unit 32 and is focused, so as to improve the visual effect of the image.

The polarization direction of the first linear polarizer 33a, the polarization direction of the second linear polarizer 33b, and the polarization direction of the reflective polarizer 22 are configured to be the same; the optical path transmission direction of the reflective polarizer 22, the optical path transmission direction of the first linear polarizer 33a, and the optical path transmission direction of the second linear polarizer 33b are also configured to be the same, that is, when a light beam transmitted toward the display device 10 is transmitted through the reflective polarizer 22, the first linear polarizer 33a, and the second linear polarizer 33b, the light beam is reflected by the reflective polarizer 22, absorbed by the first linear polarizer 33a, or absorbed by the second linear polarizer 33b, and cannot be transmitted through the above components.

The display device 10 comprises a third line polarizer 12 and a quarter-wave plate 13. The quarter-wave plate 13 is disposed on the optical path of the image light L1 emitted from the display surface 11, and the third line polarizer 12 is disposed between the quarter-wave plate 13 and the display surface 11. The third linear polarizer 12 has a polarization direction for transmitting the image light L1 in the same polarization direction as the third linear polarizer 12, and the quarter-wave plate 13 converts the image light L1 transmitted from the third linear polarizer 12 into circularly polarized light. The third linear polarizer 12 and the quarter-wave plate 13 in combination serve to convert the image light L1 emitted from the display face 11 of the display device 10 into circularly polarized light. In order to satisfy the condition of converting linearly polarized light into circularly polarized light, it is necessary to set the angle between the optical axis 131 of the quarter-wave plate 13 and the polarization direction of the third linearly-polarizing plate 12 to be 45 °.

Example two

Referring to fig. 3, a display system 200 of the second embodiment of the present application is substantially similar to the display system 100, except that the light blocking layer 315 is no longer located on the second surface 212 of the first lens 21, but is disposed between the first lens 21 and the quarter-wave plate 23. The light blocking layer 315 blocks the second region 217 of the first lens 21. The light blocking layer 315 serves to absorb a part of the image light L1 passing through the second region 217, and another part of the image light L1 is transmitted from the side of the first region 216 away from the display device 10 to display a VR image or an AR image. In the present embodiment, the light blocking layer 315 is a ring structure, but not limited thereto; the absence of the light blocking layer 315 on the surface of the lens can prevent the light blocking layer 315 from contacting the lens to cause abrasion, which serves to increase the lifetime of the first lens 21. In this embodiment, the light blocking layer 315 may be a polymer material such as a black layer, a metal layer, or a resin, but is not limited thereto. In addition, the structure and the optical path direction of other parts of the display system 200 are the same as those of the corresponding parts of the display system 100 in the first embodiment, and are not described again here.

EXAMPLE III

Referring to fig. 4, a display system 300 according to a third embodiment of the present application is substantially similar to the display system 100 except that a second anti-reflection layer 34 is disposed on an optical path of the image light L1 transmitted from the second linearly polarizing plate 33 b. Since the display system 300 is affected by the surrounding environment during use, stray light such as ambient light may enter the display system 300. Therefore, when the stray light enters the display system 300, the stray light is reflected by the display system 300, so that the user can see unnecessary image information, i.e., ghost images are generated. Therefore, in the present embodiment, the second antireflection layer 34 can suppress reflection of the ambient light in the display system 300 and suppress reflection of the image light L1 transmitted from the second linearly polarizing plate 33 b. The second anti-reflection layer 34 may be an interference film capable of generating destructive interference with respect to the wavelength of the image light L1, but is not limited thereto, and in other embodiments, the second anti-reflection layer 34 may also be another kind of anti-reflection layer. In addition, the structure and the optical path direction of other parts of the display system 300 are the same as those of the corresponding parts of the display system 100 in the first embodiment, and are not described again here.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that the proper modifications and changes of the above embodiments are within the scope of the present application as claimed.

Claims

1. A display system, comprising:

a display device having a display surface for emitting image light; and

a first lens assembly comprising:

2. The display system of claim 1, wherein the first lens has a first surface facing the display device and a second surface facing away from the display device, the first lens assembly further comprising:

a first anti-reflection layer disposed on the first surface for reducing reflection of the image light; and

and the semi-reflection film is arranged on the second surface and used for reflecting part of the image light.

3. The display system of claim 2, wherein the second surface comprises a first region and a second region that are tiled with each other, the second region surrounding the first region, the light blocking layer disposed on the second surface in the second region, another portion of the image light being transmitted from the first region.

4. The display system of claim 1, further comprising a second lens assembly disposed on an optical path of another portion of the image light emitted from the first lens assembly for filtering the another portion of the image light and adjusting a focal length of the another portion of the image light to display a VR image or an AR image.

5. The display system of claim 4, wherein the second lens assembly comprises:

a second anti-reflection layer disposed on a light path of the other part of the image light for suppressing reflection of the other part of the image light;

and the second lens is arranged between the second anti-reflection layer and the first lens component and is used for focusing the other part of the image light.

6. The display system of claim 5, wherein the second lens assembly further comprises a focusing portion disposed between the second anti-reflection layer and the second lens for adjusting a focal length of the display system.

7. The display system of claim 6, wherein the focusing portion comprises at least one liquid crystal lens.

8. The display system of claim 6, wherein the second lens assembly further comprises a first linear polarizer disposed between the second lens and the focus portion.

9. The display system of claim 8, wherein the second lens assembly further comprises a second linear polarizer disposed between the focusing portion and the second anti-reflection layer for selectively transmitting another portion of the image light.

10. The display system of claim 9, the first linear polarizer having the same polarization direction as the second linear polarizer.