TWI764763B - Head mounted display device - Google Patents

Abstract

A head mounted display includes a first display, a second display, a third display, and an optical element. The first display projects a first image to a first target area. The second display projects a second image to a second target area. The third display projects a third image. The optical element is configured between the first target area, the second target area, the first display, the second display, and the third display. The optical element r is configured to transmit the first image to the first target area and the second image to the second target area, and reflects the third image toward the first target area and the second target area.

Description

head mounted display

The present invention relates to an electronic device, and more particularly, to a head-mounted display device.

With the advancement of electronic technology, people's requirements for the effect of the visual experience of electronic devices are increasing. In the technical field of head-mounted displays, it is a very important indicator in optical products whether the dizziness that the user may produce in the visual experience can be alleviated. In addition, there are too many explicit design discussions at multiple levels. For example, in the prior art, multiple image planes are often used to solve the problem of vergence-accommodation conflict, which can effectively help alleviate the wearing head Visual discomfort from wearing a monitor. In the prior art, the multi-layer display structure often needs to add many components and volumes, which makes it difficult to balance the pursuit of visual anti-dizziness comfort, the pursuit of lightness and comfort to wear, and the affordable cost of consumer electronics.

The present invention provides a head-mounted display device, which can improve the comfort of visual experience and provide multi-level display effects.

The head-mounted display device of the present invention includes a first display, a second display, a third display, and an optical element. The first display projects the first display image to the first target area. The second display projects the second display image to the second target area. The third display projects a third display image. The optical element is arranged between the first target area, the second target area and the first display, the second display and the third display. The optical element transmits the first display image to the first target area, transmits the second display image to the second target area, and reflects the third display image to the first target area and the second target area.

Based on the above, in the head-mounted display device according to the embodiment of the present invention, the optical element transmits the first display image to the first target area, transmits the second display image to the second target area, and reflects the third display image to the first target area. The target area and the second target area enable multiple images at different depths to be transmitted to the user's eyes. Under the premise of providing multi-level display effects, the phenomenon of vergence adjustment conflicts generated by the user during operation is reduced, and the comfort level under long-term operation is improved.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

The embodiments refer to the orientation of the drawings only. Accordingly, the directional terms used are intended to illustrate rather than limit the present invention. In the drawings, various figures depict the general characteristics of methods, structures and/or materials used in particular exemplary embodiments. These drawings, however, should not be construed to define or limit the scope or nature of the scope or nature encompassed by these exemplary embodiments. For example, the relative sizes, thicknesses and positions of various layers, regions and/or structures may be reduced or exaggerated for clarity.

In the embodiments, the same or similar elements will be given the same or similar reference numerals, and repeated descriptions thereof will be omitted. In addition, the features of the different exemplary embodiments may be combined with each other without conflict, and simple equivalent changes and modifications made in accordance with the present specification or the scope of the claims are still within the scope of the present patent. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name discrete elements or to distinguish different embodiments or scopes, and are not used to limit the number of elements. The upper limit or the lower limit is not intended to limit the manufacturing order or the arrangement order of the elements.

FIG. 1 is a schematic diagram of a head-mounted display device 10 according to a first embodiment of the present invention. An embodiment of the present invention provides a head-mounted display device 10 . The head-mounted display device 10 can be worn by a user to provide a display effect for experiencing virtual reality (virtual reality), augmented reality (augmented reality) or mixed reality (mixed reality). Referring to FIG. 1 , in this embodiment, the head-mounted display device 10 includes a first display 110 , a second display 130 , a third display 120 and an optical element 140 . In other embodiments, the type and quantity of each component can be adjusted according to requirements or application scenarios, and the present invention is not limited thereto.

The first display 110 and the second display 130 are disposed corresponding to the two eyes and can display different image frames respectively, but the present invention is not limited to this. In some embodiments, the first display 110 and the second display 130 may display the same image frame, and one of them may not display the image frame. In this embodiment, the third display 120 is disposed between the first display 110 and the second display 130 .

In this embodiment, the first display 110 and the second display 130 provide two image frames with parallax, so that the user can see a three-dimensional image.

The optical element 140 is disposed between the first target area TG1 corresponding to the user's left eye area, the second target area TG2 corresponding to the user's right eye area and the first display 110 , the second display 130 and the third display 120 . The optical element 140 includes a first beam splitter 1410 , a second beam splitter 1420 , a third beam splitter 1430 , a first lens 1440 , a second lens 1450 and a third lens 1460 .

The first beam splitter 1410 is disposed between the first target area TG1 and the first display. The second beam splitter 1420 is disposed between the second target area TG2 and the second display. The third beam splitter 1430 can be disposed between the first beam splitter 1410 and the second beam splitter 1420 . In this embodiment, the first beam splitter 1410 and the second beam splitter 1420 may be planar beam splitters, and the third beam splitter 1430 is an X-type beam splitter. The third beam splitter 1430 may be formed of four horns, and the surfaces of the four horns are respectively coated with beam splitters. By combining the third beam splitter with the first beam splitter or the second beam splitter 1430, ghost images and stray light can be separated from the effective image light path, thereby ensuring image quality and contrast.

The first lens 1440 is disposed between the first beam splitter 1410 and the first display 110 . The second lens 1450 is disposed between the second beam splitter 1420 and the second display 130 . The third lens 1460 is disposed between the third beam splitter 1430 and the third display 120 . In this embodiment, the first lens 1440 , the second lens 1450 and the third lens 1460 are, for example, fixed-focus lenses, but the invention is not limited thereto. In other embodiments, it can also be a zoom lens, and the zoom lens is, for example, a liquid crystal lens (LC Lens), but not limited thereto. The focal length of the third lens 1460 may be the same as or different from the focal length of the first lens 1440 and the second lens 1450, and the present invention is not limited thereto.

The first display 110 and the second display 130 are used for projecting the first display image DB1 and the second display image DB2 to the first target area TG1 and the second target area TG2 along the first direction DIR1, respectively. The first display image DB1 and the second display image DB2 respectively penetrate the first beam splitter 1410 and the second beam splitter 1420 to be projected to the first target area TG1 and the second target area TG2.

The third display 120 projects the third display image DB3 to the third beam splitter 1430 along the second direction DIR2. The third display image DB3 can be reflected through the multiple beam splitting coatings of the third beam splitter 1430, so that the third display image DB3 is projected to the first target area TG1, and the third display image DB3 is also projected to the second display image DB3. Target area TG2. In this embodiment, the second direction DIR2 may be the same as the first direction DIR1. The third display image DB3 may be a distant parallax-free image. The reflected third display image DB3 can be transmitted to the first target area TG1 corresponding to the user's left eye area and the second target area TG2 corresponding to the user's right eye area. According to the above, the user's left and right can receive the same third display image DB3 at the same time, and obtain a so-called indistinguishable image.

In this embodiment, the brightness of the first display image DB1 and the second display image DB2 generated by the first display 110 and the second display 130 respectively may be different from the brightness of the third display image 120 generated by the third display 120 . For example, the first display image DB1 and the second display image DB2 as the foreground may be adjusted to be brighter than the third display image DB3 as the background.

On the other hand, for the user's visual perception, the first display image DB1 , the second display image DB2 and the third display image DB3 may respectively provide different depths of field. In this embodiment, the first display image DB1, the second display image DB2, and the third display image DB3 can be respectively imaged on imaging surfaces with different depths, and the depth of field of the third display image DB3 can be larger than that of the first display image DB1 and the third display image DB3. The second shows the depth of field of the image DB2. The first display image DB1 and the second display image DB2 may have substantially the same depth of field. In this way, the multiple objects in the image observed by the user can be the same as the actual image, and have multiple different depth-of-field effects according to the positions of the objects, which can effectively reduce the problems caused by the vergence-accommodation conflict. The resulting state of dizziness for the user improves the comfort of the user.

Incidentally, in the embodiment of the present invention, the first display 110 , the second display 130 and the third display 120 may be selected from a liquid crystal on silicon (LCOS) display, a digital micromirror device (Digital Micromirror Device) , DMD) displays, Organic Light Emitting Diode (OLED) displays, Liquid Crystal Displays (LCD), Micro Light Emitting Diode (Micro-LED) displays, or both The combination.

It is worth mentioning that, in this embodiment of the present invention, the first display 110 and the second display 130 may share the same display panel. And by planning a first area of the display panel as the first display 110 and a second area as the second display 110 . Alternatively, in another embodiment of the present invention, two independent display panels may also be used to form the first display 110 and the second display 130 respectively.

FIG. 2 is a schematic diagram of a head-mounted display device 20 according to a second embodiment of the present invention. The head mounted display device 20 includes a first display 210 , a second display 220 , a third display 230 and an optical element 240 . The optical element 240 includes a first beam splitter 241 , a second beam splitter 242 , a third beam splitter 2430 , a first lens 2440 , a second lens 2450 and a third lens 2460 .

The various elements in this embodiment may be the same as those in the embodiment of FIG. 1 . The difference between this embodiment and the embodiment of FIG. 1 is that the third display 230 in this embodiment is not disposed between the connection between the first display 210 and the second display 220 . In detail, the first display 210 and the second display 220 can project the first display image and the second display image respectively in the same first direction DIR1, and the third display 230 can project in the second direction different from the first direction DIR1 DIR2 projects a second display image. The first direction DIR1 and the first direction DIR2 may have a preset angle other than zero degrees. In some embodiments of the present invention, the preset angle may be 90 degrees, or any angle other than 90 degrees.

To sum up, the head-mounted display of the present invention provides a multi-level display effect and reduces visual convergence by providing an additional third display and using the third display to provide parallax-free images to the user's left and right eyes. Regulate the phenomenon of conflict. In addition, through the third display image provided by the third display, the brightness of the overall display image generated by the head-mounted display can also be enhanced, thereby improving the display quality.

10: Head Mounted Displays

110: The first display

120:Third display

130: Second monitor

140: Optical Components

1410: First beam splitter

1420: Second beam splitter

1430: Third beam splitter

1440: First Lens

1450: Second lens

1460: Third lens

20: Head Mounted Displays

210: First Display

220: Second monitor

230: Third Display

240: Optical Components

241: First beam splitter

242: Second beam splitter

2430: Third beam splitter

2440: First Lens

2450: Second lens

2460: Third lens

DB1~DB3: Display image

DIR1, DIR2: Direction

TG1: first target area

TG2: Second target area

FIG. 1 is a schematic diagram of a head-mounted display device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of a head-mounted display device according to a second embodiment of the present invention.

10: Head Mounted Displays

110: The first display

120:Third display

130: Second monitor

140: Optical Components

1410: First beam splitter

1420: Second beam splitter

1430: Third beam splitter

1440: First Lens

1450: Second lens

1460: Third lens

DB1~DB3: Display image

DIR1, DIR2: Direction

TG1: first target area

TG2: Second target area

Claims (9)

A head-mounted display device, comprising: a first display, projecting a first display image to a first target area; a second display, projecting a second display image to a second target area; a third display, Projecting a third display image; and an optical element disposed between the first target area, the second target area and the first display, the second display and the third display, the optical element transmitting the first display sending an image to the first target area, transmitting the second display image to the second target area, and reflecting the third display image to the first target area and the second target area, wherein the optical element includes: a first a beam splitter, arranged between the first target area and the first display; a second beam splitter, arranged between the second target area and the second display; and a third beam splitter, which is an X-type beam splitter, It is arranged between the first beam splitter and the second beam splitter. The head-mounted display device of claim 1, wherein the depth of field of the third display image is greater than the depth of field of the first display image and the depth of field of the second display image. The head-mounted display device according to claim 1, wherein the first target area corresponds to the user's left eye area, and the second target area corresponds to the user's right eye area. The head-mounted display device as described in claim 1, wherein the optical element further comprises: A first lens is arranged between the first beam splitter and the first display; a second lens is arranged between the second beam splitter and the second display; and a third lens is arranged between the third beam splitter between the mirror and the third display, wherein the focal length of the third lens is different from the focal length of the first lens and the focal length of the second lens. The head-mounted display device of claim 1, wherein the first display and the second display respectively project the first display image and the second display image along a first direction, and the third display The third display image is projected along a second direction. The head-mounted display device according to claim 5, wherein the second direction is the same as or different from the first direction. The head-mounted display device as claimed in claim 6, wherein the first direction and the second direction have a predetermined angle that is non-zero degree. The head-mounted display device as claimed in claim 7, wherein the predetermined included angle is 90 degrees. The head-mounted display device of claim 1, wherein the first display and the second display share the same display panel.

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