CN110794583A

CN110794583A - Head-mounted display and image imaging device

Info

Publication number: CN110794583A
Application number: CN201811508857.9A
Authority: CN
Inventors: 蔡育根; 杨博森; 陈宇恒; 丁领亿
Original assignee: HTC Corp
Current assignee: HTC Corp
Priority date: 2018-08-01
Filing date: 2018-12-11
Publication date: 2020-02-14
Also published as: TWI684791B; TW202008030A

Abstract

The invention discloses a head-mounted display and an image imaging device thereof, wherein the image imaging device comprises a first display, a second display and a first zooming device. The first display generates a first sub-image, wherein the first sub-image is imaged on the first imaging plane and imaged again to the target system. The second display generates a second sub-image, which is imaged at a second imaging plane and re-imaged to the target system. The first zooming device is placed in front of the second display and used for adjusting the position of the second imaging plane. The first imaging plane and the second imaging plane may or may not overlap each other.

Description

Head-mounted display and image imaging device

Technical Field

The present invention relates to a head-mounted and display image imaging device, and more particularly, to a head-mounted and display image imaging device capable of dynamically adjusting a display mode.

Background

With the progress of electronic technology, the research and development of displays have changed greatly. In the electronic products of today, it is a necessary trend to provide a high-resolution display device. In particular, in the head mounted displays of virtual reality and augmented reality, it is an important issue for designers in the field to improve the resolution of the display screen or to provide high-quality stereoscopic vision, within limited software and hardware resources.

Disclosure of Invention

The invention provides a head-mounted display and an image imaging device thereof, which can dynamically adjust an operation mode to provide image resolution or provide a depth display effect.

The image imaging device comprises a first display, a second display and a first zooming device. The first display generates a first sub-image, wherein the first sub-image is imaged on the first imaging plane and imaged again to the target system. The second display generates a second sub-image, wherein the second sub-image is imaged at a second imaging plane and re-imaged to the target system. The first zoom device is arranged in front of the second display and used for adjusting the position of the second imaging plane. The first imaging plane and the second imaging plane may or may not overlap each other.

The head-mounted display comprises a shell and at least one image imaging device. The image imaging device is disposed in the housing.

Based on the above, the present invention adjusts the position of the second imaging plane of the second sub-image generated by the second display through the zoom device, and allows the first imaging plane and the second imaging plane to overlap or not overlap each other. The first imaging plane and the second imaging plane are overlapped with each other to improve the image resolution; further, the depth of the display image can be increased by preventing the first imaging plane and the second imaging plane from overlapping each other. Therefore, the image imaging device is a two-state adjustable super-resolution depth optical imaging device, and the visual effect is greatly improved.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic view of an image forming apparatus according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating an adjustment operation of a second imaging plane according to an embodiment of the present invention;

fig. 3A and 3B are schematic diagrams illustrating display images generated by an imaging device in different modes according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a display image generated according to another embodiment of the present invention;

FIG. 5 is a schematic diagram of an embodiment of a light splitting device according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a head-mounted display according to an embodiment of the invention.

Description of the symbols

100. 400 and 610: image forming apparatus

110. 410: first display

120. 420: second display

140. 440, a step of: lens group

130. 430, 460: zoom device

600: head-mounted display

620: shell body

AX 1: axial line

TA 1: target system

IS 1: second imaging plane

IS 2: first imaging plane

210: controller

CTR: control signal

PS1, PS 2: display pixel

And (2) DS: distance between each other

S1, S2: surface of

PP: optical axis of the second display

DP: reflection path

θ: included angle

IS 1', IS1 ": image plane

Detailed Description

Referring to fig. 1, fig. 1 is a schematic view illustrating an image forming apparatus according to an embodiment of the invention. The image forming apparatus 100 includes a first display 110, a second display 120, a lens assembly 140 and a zoom apparatus 130. In the present embodiment, the lens assembly 140, the first display 110, the zoom apparatus 130 and the second display 120 may be arranged along the same axis AX1, wherein the axis AX1 passes through the target system TA 1.

The first display 110 IS imaged on the first imaging plane IS 2. The second display 120 IS imaged on the second imaging plane IS 1. In the present embodiment, the target system TA1 is the position of the user's eyes or the image sensor system. The first display 110 and the second display 120 generate a first sub-image at the first imaging plane and a second sub-image at the second imaging plane, respectively, and re-image to the target area TA1, respectively. Wherein the first display forms a virtual image on the first imaging plane IS2 and the second display forms another virtual image on the second imaging plane IS1 by the action of the lens group 140.

It should be noted that the zoom apparatus 130 IS disposed in front of the second display 120, and the position of the second imaging plane IS1 IS changed by the focal length modulation of the zoom apparatus 130. The zoom apparatus 130 may overlap the second imaging plane IS1 and the first imaging plane IS2, or may have a distance between the second imaging plane IS1 and the first imaging plane IS2 without overlapping.

For details of the operation of the zoom apparatus 130, please refer to fig. 2, which is a schematic diagram illustrating an adjustment operation of the second imaging plane according to the embodiment of the present invention. In fig. 2, the image forming apparatus 100 further includes a controller 210. The controller 210 is coupled to the zoom apparatus 130 and provides a control signal CTR to the zoom apparatus 130. The zoom apparatus 130 may be an electrically controlled liquid crystal lens (or an electrically controlled liquid crystal lens array), and may adjust the focal length of the electrically controlled liquid crystal lens according to the control signal CTR. When the focal length of the zoom apparatus 130 IS adjusted, the second display generates a new image relationship, so as to change the position of the second imaging plane IS1, and thus, the second imaging plane IS1 can be adjusted according to the control signal CTR.

In the present embodiment, the original position of the second imaging plane IS1 may not be the same as the position of the first imaging plane IS 2. By the above-described adjustment mechanism, the second imaging plane IS1 may be adjusted to the imaging plane IS 1' to be close to the first imaging plane IS2, or the second imaging plane IS1 "may be adjusted to the imaging plane IS1 ″ to overlap the first imaging plane IS 2. Of course, in other embodiments, the original position of the second imaging plane IS1 may be the same as the position of the first imaging plane IS2, and the first imaging plane IS2 and the second imaging plane IS1 may overlap each other. By the above adjustment mechanism, the first imaging plane IS2 and the second imaging plane IS1 can be isolated from each other without overlapping.

Incidentally, the first display 110 and the second display 120 in this embodiment may be flat panel displays. The first and second imaging planes IS2 and IS1 generated by the first and

second displays

110 and 120, respectively, may be planar. In other embodiments of the present invention, the first display 110 and the second display 120 may be non-planar displays (for example, curved displays), and under such a condition, the first imaging plane IS2 and the second imaging plane IS1 generated by the first display 110 and the second display 120 respectively corresponding to each other may be curved surfaces. It should be noted that, in the present embodiment, the first display 110 may be a transparent display. In this way, the second display 110 can be imaged to the target area TA1 twice through the first display 110.

In addition, in the embodiment, the lens group 140 may include one or more lenses, and the illustrated convex lens represents the lens group 140 only for illustration, and does not represent that the lens group 140 only consists of a single convex lens.

The controller 210 may be a processor with computing capabilities. Alternatively, the controller 210 may be a Hardware Circuit designed by Hardware Description Language (HDL) or any other digital Circuit design known to those skilled in the art, and implemented by Field Programmable Gate Array (FPGA), Complex Programmable Logic Device (CPLD) or Application-specific Integrated Circuit (ASIC). In this embodiment, the controller 210 may generate the control signal CTR according to a display mode that the image forming apparatus 100 needs to execute. In an analog control mode, the controller 210 can drive the zoom apparatus 130 to adjust the position of the second imaging plane IS1 by controlling the voltage of the signal CTR. In the digital control mode, the controller 210 transmits a value through the control signal CTR, and causes the zoom apparatus 130 to adjust the position of the second imaging plane IS1 according to the magnitude of the received value, and change the distance between the first imaging plane IS2 and the second imaging plane IS 1. The relationship between the magnitude of the voltage and the transmitted value of the control signal CTR and the distances between the first imaging plane IS2 and the second imaging plane IS1 may be determined by a designer without any limitation.

Referring to fig. 3A and 3B, fig. 3A and 3B respectively illustrate display images generated by the imaging device according to the embodiment of the invention in different modes. In fig. 3A, the first sub-image has a plurality of first display pixels PS1, and the second sub-image has a plurality of second display pixels PS 2. The plurality of first display pixels PS1 in the first sub-image are respectively interlaced with the second display pixels PS2 in the second sub-image. Under such a condition, when the first imaging plane and the second imaging plane overlap each other, the first display pixels PS1 and the second display pixels PS2, which are interlaced with each other, may be combined into one high-resolution display image. That is, with the image imaging apparatus according to the embodiment of the present invention, the resolution of the display image that can be generated may be the sum of the resolution of the first display and the resolution of the second display.

In fig. 3B, the first imaging plane IS2 and the second imaging plane IS1 do not overlap each other, and have a pitch DS. In this way, the display images generated on the first imaging plane IS2 and the second imaging plane IS1 have a depth difference, and a stereoscopic image with depth can be generated.

As shown in FIG. 4, the lens assembly 440, the beam splitter 450, and the first display 410 can be sequentially disposed along an axis AX 1. The first display 410 IS imaged to the first imaging plane IS2 through the light splitting element 450, and then imaged to the target system TA1 again. The second display IS reflected and imaged to a second imaging plane IS1, and then IS imaged to a target system TA1 again.

As in the previous embodiment, the position of the second imaging plane IS1 can be adjusted by adjusting the focal length of the zoom device 430. By providing a distance between the second imaging plane IS1 and the first imaging plane IS2, the image imaging apparatus 400 can generate a display image having depth. In contrast, the resolution of the display image generated by the image imaging apparatus 400 can be improved by overlapping the second imaging plane IS1 and the first imaging plane IS 2.

For details of the configuration of the light splitting device 450, please refer to fig. 5, which is a schematic diagram of an implementation of the light splitting device according to an embodiment of the present invention. In fig. 5, the light splitting device 450 can transmit the light of the first display 410 and image the light onto the first imaging plane IS 2. The beam splitter 450 also reflects the light from the second display 420 and forms an image on the second image forming surface IS 1. The second surface S2 of the light splitting device 450 and the optical axis PP of the second display 420 form an included angle θ. In the present embodiment, the included angle θ is between 5 degrees and 85 degrees.

On the other hand, in the embodiment of fig. 5, another zoom apparatus 460 may be configured corresponding to the first display 410. The zoom apparatus 460 can adjust the position of the first imaging plane IS2 to increase the flexibility of the image imaging apparatus in changing the position of the imaging plane.

On the other hand, the zoom apparatus 460 and the zoom apparatus 430 may be set alternatively or simultaneously, and are not particularly limited.

Referring to fig. 6, fig. 6 is a schematic view illustrating a head-mounted display according to an embodiment of the invention. The head-mounted display 600 includes one or more image imaging devices 610 and a housing 620. The image imaging device 610 corresponds to the target system TA1 to be disposed in the housing 620.

The image forming apparatus 610 in this embodiment can be implemented by the

image forming apparatus

100 or 400 in the foregoing embodiments. The details of the operation of the

image forming apparatus

100 or 400 have been described in the foregoing embodiments and implementations, and are not repeated herein.

In summary, the image forming apparatus of the present invention can adjust whether the zooming device 430 zooms or not to overlap or separate the image planes of the two sub-images generated by the two displays. Therefore, the image imaging device can have different operation modes and be used for generating a display image with high resolution or generating a stereoscopic image with a depth visual effect. The efficiency of the image imaging device is effectively improved.

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An image forming apparatus, comprising:

the first display is used for imaging the first sub-image on the first imaging surface;

the second display is used for imaging the second sub-image on the second imaging surface; and

the first zooming device is arranged in front of the second display and used for adjusting the position of the second imaging surface;

wherein the first imaging plane and the second imaging plane may or may not overlap each other.

2. The image forming apparatus as claimed in claim 1, further comprising:

a controller coupled to the first zoom apparatus, the controller transmitting a control signal to the first zoom apparatus,

the first zoom device adjusts the position of the second imaging plane according to the control signal.

3. The image imaging device as claimed in claim 1, wherein the first sub-image comprises a plurality of first display pixels, the second sub-image comprises a plurality of second display pixels, and the first display pixels and the second display pixels are respectively arranged in a staggered manner when the first imaging plane and the second imaging plane are overlapped.

4. The image imaging apparatus according to claim 1, wherein when the first imaging plane and the second imaging plane are not overlapped, the first imaging plane and the second imaging plane generate a stereoscopic image.

5. The image forming apparatus as claimed in claim 1, further comprising:

a light splitting device disposed on the imaging paths of the first sub-image and the second sub-image for transmitting the first sub-image to the target system; and the second sub-image is used for generating a reflection path according to the projection path of the second sub-image and transmitting the second sub-image to the target system according to the reflection path.

6. The image imaging device as claimed in claim 4, wherein the surface of the light splitting device and the optical axis of the second display have an included angle between 5 degrees and 85 degrees.

7. The image forming apparatus as claimed in claim 1, further comprising:

and the lens group is arranged on an imaging path of the first imaging surface and the second imaging surface and is arranged adjacent to the target system.

8. The image forming apparatus as claimed in claim 1, further comprising:

the second zoom device is arranged on the imaging path of the first sub-image and used for adjusting the position of the first imaging surface.

9. A head-mounted display, comprising:

a housing; and

the image imaging apparatus of claim 1, wherein the at least one imaging device is disposed in the housing.