TWI824640B - Head mounted display, display device and image display method thereof - Google Patents

Abstract

A head mounted display, a display device and an image display method are provided. The display device includes a first display and a second display. The first display is configured to provide a first display image to a peripheral area of a target zone. The second display is configured to provides a second display image to a central area of the target zone. A resolution of the second display image is higher than a resolution of the first display image.

Description

Head-mounted display, display device and image display method

The present invention relates to a head-mounted display, a display device and an image display method thereof, and in particular, to a head-mounted display, a display device and an image display method of a composite light field display system.

With the advancement of electronic technology, a light field display has been proposed. Common light field displays are roughly divided into five categories: High Speed Spin, Multi-Projector, Directional Backlight, Multi Layer Display and Lens Array Formula (Lens Array).

In the conventional technical field, especially in the lens array type light field display, the main problem is that the resolution cannot be effectively improved. Therefore, how to improve the resolution of the light field display to enhance the user's image experience is an important issue for those skilled in the art.

The present invention provides a head-mounted display, a display device and an image display method thereof, which can improve the display effect of images.

The display device of the present invention includes a first display and a second display. The first display is used to provide a first display image to the peripheral area of the target area. The second display provides a second display image to the center area of the target area. The resolution of the second display image is greater than the resolution of the first display image.

The head-mounted display device of the present invention includes a main body and the display device as described above. The display device is arranged in the main body.

The image display method of the present invention includes: making the first display provide a first display image to the peripheral area of the target area; making the second display provide a second display image to the central area of the target area; making the resolution of the second display image be greater than The first displays the resolution of the image.

Based on the above, the present invention uses the second display to provide a second display image with relatively high resolution in the central area of the target area where human eyes' attention is relatively concentrated. In the peripheral area of the target area, a first display image with a relatively low resolution is provided through the first display. In this way, in a light field display system, the display device of the present invention can effectively improve the display quality of images. In the application of head-mounted displays, the display performance of virtual images can be effectively improved.

100, 200, 301, 302, 420: display device

110, 210, 310, 330: first display

111, 121, 211-1, 211-2, 311, 321, 331, 341, 344: display panel

112-1, 112-2, 122, 212-1, 212-2, 312, 322, 332, 342, 345: lens array

120, 220, 320, 340: Second monitor

323: Semi-transparent mirror

343:Spectroscope

400:Head mounted display

410: Ontology Department

A:View angle

EYE:eyeball

H1: Opening area

IMG1: first display image

IMG2: Second display image

IMG21, IMG22: sub display image

S1, S2: Reflective surface

S510~S530: steps

TG: target area

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

FIG. 2 is a schematic diagram of a display device according to another embodiment of the present invention.

3A and 3B are schematic diagrams of different implementations of a display device according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of a head-mounted display according to an embodiment of the present invention.

FIG. 5 is a flowchart of an image display method according to an embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a display device according to an embodiment of the present invention. The display device 100 includes a first display 110 and a second display 120 . The first display 110 and the second display 120 are arranged to overlap each other. The first display 110 is used to project the first display image IMG1 toward the peripheral area of the target area TG. The second display 120 is used to provide the second display image IMG2 to the center area of the target area TG. Among them, the target area TG can be the area where the user's eyeball EYE is located. In this embodiment, the resolution of the second display image IMG2 projected by the second display 120 may be greater than the resolution of the first display image IMG1 projected by the first display 110 .

Regarding the implementation details of the configuration of the first display 110 and the second display 120 . The first display 110 includes a display panel 111 and lens arrays 112-1 and 112-2. Lens arrays 112-1 and 112-2 overlap with the upper half area and the lower half area of the display panel 111, respectively. The central area of the display panel 111 does not overlap with the lens arrays 112-1 and 112-2. The second display 120 is configured corresponding to the central area of the display panel 111, where the display panel 111 is configured between the target area and and the second display 120. That is to say, the second display 120 may be disposed behind the display panel 111 .

In this embodiment, the second display 120 includes a display panel 121 and a lens array 122. The display panel 121 and the lens array 122 are arranged to overlap each other, and the lens array 122 is arranged in front of the display panel 121.

The second display image IMG2 projected by the display panel 121 of the second display 120 penetrates the display panel 111 of the first display 110 and reaches the center area of the target area TG. In this embodiment, the first display 110 may be a transmissive display, that is, the display panel 111 of the first display 110 is a transmissive display panel. The transmittance of the first display 110 may be 80%. The first display 110 is used to project the first display image IMG1 to the peripheral area of the target area TG. It is worth noting that the user's visual field angle A for the second display image IMG2 in the target area TG may be between 20 and 60 degrees.

Please note here that the second display 120 may be a micro-display and may provide the second display image IMG2 that is a light field display image to the center area of the user's eyeball EYE. In this embodiment, the second display 120 can effectively improve the display quality of the display device 100 by providing the second display image IMG2 with a relatively high resolution to the center area of the user's eyeball EYE.

Please refer to FIG. 2 , which is a schematic diagram of a display device according to another embodiment of the present invention. The display device 200 includes a first display 210 and a second display 220 . The central area of the first display 210 may have an opening area H1, and the second display 220 may be disposed in the opening area H1. The first display 210 includes display panels 211-1, 211-2 and lens arrays 212-1, 212-2. The display panels 211-1 and 211-2 are arranged to overlap with the lens arrays 212-1 and 212-2 respectively. The second display 220 includes a display panel 221 and a lens array 222. The display panel 221 and the lens array 222 are arranged to overlap each other.

In this embodiment, in the first display 210, the lens arrays 212-1 and 212-2 are respectively disposed in front of the display panels 211-1 and 211-2, and the display panels 211-1 and 211-2 provide the first The image IMG1 is displayed to the peripheral area of the target area TG, where the target area TG corresponds to the position of the user's eyeballs. In the second display 210, the lens array 222 is arranged in front of the display panel 221, and the display panel 222 provides the second display image IMG2 to the central area of the target area TG.

By disposing the second display 210 in the opening area H1 in the center area of the first display 210, the second display 210 can effectively provide the second display image IMG2 for the center area of the target area TG. And by making the resolution of the second display image IMG2 higher than that of the first display image IMG1, the user can directly see the second display image IMG2 with high resolution, which can effectively improve the visual effect experienced by the user.

Incidentally, in this embodiment, the shape of the opening area H1 can be configured to match the shape of the second display 210 . For example, the opening area H1 can be a circle, an ellipse, a rectangle, a rhombus, or any regular polygon, etc., without any fixed limitation.

Please refer to FIG. 3A and FIG. 3B below. FIG. 3A and FIG. 3B are schematic diagrams of different implementations of a display device according to another embodiment of the present invention. In FIG. 3A , the display device 301 includes a first display 310 and a second display 320 . The second display 320 is arranged between the target area TG and the first display 310 . First display 310 Then it faces the target area TG, where the target area TG corresponds to the position EYE of the user's eyeballs.

In detail, the first display 310 includes a display panel 311 and a lens array 312 . The lens array 312 is disposed in front of the display panel 311 and overlaps the display panel 311 . The display panel 311 is used to project the first display image IMG1. The second display 320 includes a display panel 321, a lens array 322, and a semi-transparent mirror 323. The semi-transparent mirror 323 may be disposed at a position corresponding to the central area of the display panel 311 . The display panel 321 and the lens array 322 are overlapped and arranged outside the image projection area of the display panel 311. The display panel 321 is used to project the second display image IMG2 to the semi-transparent mirror 323 . Furthermore, the semi-transparent mirror 323 can reflect the second display image IMG2, and cause the second display image IMG2 to be reflected to the central area of the target area.

In addition, the first display image IMG1 projected by the display panel 311 can penetrate the semi-transparent mirror 323 to be transmitted to the peripheral area of the target area TG.

Similar to the previous embodiment, the second display 320 of this embodiment can effectively improve the user's experience of the display image of the display device 301 by projecting the second display image IMG2 with a relatively high resolution to the center area of the target area TG. .

Incidentally, in this embodiment, the image projection directions of the first display 310 and the second display 320 do not need to be perpendicular to each other. As long as the image projection directions of the first display 310 and the second display 320 are not parallel to each other, they can have any included angle without specific limitations.

In FIG. 3B , the display device 302 includes a first display 330 and a second display 340 . The second display 340 is disposed in the target area TG and the first display 330 between. The first display 330 faces the target area TG, where the target area TG corresponds to the position EYE of the user's eyeballs. The first display 330 has a display panel 331 and a lens array 342 arranged to overlap each other. The display panel 331 is used to project the first display image IMG1, and allow the first display image IMG1 to pass through the beam splitter 343 to be projected to the peripheral area of the target area TG.

Different from the embodiment of FIG. 3A , in this embodiment, the second display 340 includes display panels 341 and 344 , lens arrays 342 and 345 and a beam splitter 343 . The beam splitter 343 may be disposed in front of the first display 330 corresponding to the central area of the display panel 331 . The display panel 341 and the lens array 342 are arranged to overlap each other and are arranged outside the first side of the beam splitter 343. The display panel 344 and the lens array 345 are arranged to overlap each other and are arranged outside the second side of the beam splitter 343. The first side is opposite to the second side.

The beam splitter 343 has two reflecting surfaces S1 and S2. The display panel 341 is used to project the first sub-display image IMG21 to the reflective surface S1 of the beam splitter 343 . The reflective surface S1 of the beam splitter 343 is used to reflect the first sub-display image IMG21 to the central area of the target area TG. The display panel 344 is used to project the second sub-display image IMG22 to the reflective surface S2 of the beam splitter 343 . The reflective surface S2 of the beam splitter 343 is also used to reflect the second sub-display image IMG22 to the central area of the target area TG. The first sub-display image IMG21 and the second sub-display image IMG22 can be combined into a second display image with relatively high resolution.

Please note here that the first distance between the geometric centers of the display panel 341 and the beam splitter 343 may be the same as the second distance between the geometric centers of the display panel 344 and the beam splitter 343 . The distances can be the same or different, there is no fixed limit.

It is worth mentioning that in this embodiment, by making the above-mentioned first distance and the second distance the same, the first sub-display image IMG21 and the second sub-display image IMG22 can be superimposed on each other to form a high-resolution image. Display image. By making the above-mentioned first distance and the second distance different, the first sub-display image IMG21 and the second sub-display image IMG22 can become two images with parallax, thereby generating a three-dimensional image.

Please refer to FIG. 4 below, which is a schematic diagram of a head-mounted display according to an embodiment of the present invention. The head mounted display 400 includes a main body 410 and a display device 420 . The display device 420 may be disposed in the body part 410 . The display device 420 can be implemented using any one of the display devices 100, 200, 301 and 302 of the aforementioned embodiments, and is used to provide a virtual reality image display effect.

Please refer to FIG. 5 below, which is a flow chart of an image display method according to an embodiment of the present invention. In step S510, the first display is caused to provide the first display image to the peripheral area of the target area. In step S520, the second display is caused to provide the second display image to the center area of the target area. Furthermore, in step S530, the resolution of the second display image is made greater than the resolution of the first display image.

The implementation details of the above steps have been described in detail in the previous embodiments and will not be described again here.

In summary, the display device of the present invention provides a second display to project a second display image with relatively high resolution to the central area of the target area. Thereby, by causing the second display image to be presented within a certain viewing angle range of the user, the display The quality of the display image generated by the device can be effectively improved, and the user's experience with the display image can also be improved accordingly.

100:Display device

110:First display

111, 121: Display panel

112-1, 112-2, 122: Lens array

120: Second display

A:View angle

EYE:eyeball

IMG1: first display image

IMG2: Second display image

TG: target area

Claims (15)

A display device includes: a first display for providing a first display image to a peripheral area of a target area; and a second display for providing a second display image to a central area of the target area, wherein The resolution of the second display image is greater than the resolution of the first display image, and the first display and the second display are overlapped. The display device of claim 1, wherein the first display is disposed between the target area and the second display, and the first display is a transmissive display. The display device according to claim 2, wherein the first display has a transmittance of 80%. The display device according to claim 1, wherein the central area of the first display has an opening area, and the second display is disposed in the opening area. The display device of claim 1, wherein the second display includes: a semi-transparent mirror, disposed between the first display and the target; a display panel for projecting the second display toward the semi-transparent mirror image; and a lens array disposed between the display panel and the semi-transparent mirror, The semi-transparent mirror reflects the second display image to the central area of the target area. The display device of claim 1, wherein the second display includes: a beam splitter having a first reflective surface and a second reflective surface; and a first display panel for projecting a beam toward the first reflective surface. a first sub-display image; and a second display panel for projecting a second sub-display image towards the second reflective surface, wherein the beam splitter reflects the first sub-display image and the second sub-display image to the target The central area of the area is used to form the second display image. The display device of claim 5, wherein the first distance between the first display panel and the geometric center of the beam splitter is the same as or different from the second distance between the second display panel and the geometric center of the beam splitter. The display device of claim 1, wherein the first display includes: a display panel; and a lens array disposed overlapping the display panel, wherein the lens array is disposed between the display panel and the target interval. The display device of claim 1, wherein the user's viewing angle of the second display image in the target area is between 20 and 60 degrees. A head-mounted display including: A body part; and a display device as claimed in claim 1, disposed in the body part. An image display method includes: making a first display provide a first display image to a peripheral area of a target area; making a second display provide a second display image to a central area of the target area; making the The resolution of the second display image is greater than the resolution of the first display image; and the first display and the second display are arranged to overlap. The image display method as described in claim 11 further includes: enabling a user's viewing angle of the second displayed image in the target area to be between 20 and 60 degrees. The image display method as claimed in claim 11, wherein the first display is a transmissive display. The image display method according to claim 11, further comprising: forming an opening area in the central area of the first display; and disposing the second display in the opening area. The image display method as claimed in claim 11, further comprising: setting a half-transparent mirror on the first display and the target interval; and The second display image is projected toward the semi-transparent mirror, so that the semi-transparent mirror reflects the second display image to the central area of the target area.

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