CN115933213A

CN115933213A - Display device

Info

Publication number: CN115933213A
Application number: CN202211606341.4A
Authority: CN
Inventors: 何俊樟; 郑文琳; 张豫修
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2022-07-21
Filing date: 2022-12-14
Publication date: 2023-04-07
Also published as: TWI832347B; TW202405517A

Abstract

The invention discloses a display device, which comprises a first optical mirror, a second optical mirror, a flat panel display, a polarization selection layer and a quarter-wave plate. The first optical lens has a first focus, a first central axis, and a first concave surface. The second optical lens is provided with a second focus, a second middle shaft and a second concave surface, wherein the first concave surface faces the second concave surface. The flat panel display comprises a display surface, wherein the display surface is arranged on the first focus and faces the first concave surface, and the normal of the display surface is parallel to the first central axis. The polarization selection layer is arranged on the first concave surface and is provided with a penetrating shaft. The quarter-wave plate is arranged on the second concave surface, wherein the polarization direction of the image light emitted by the display surface is vertical to the transmission axis of the polarization selection layer.

Description

Display device

Technical Field

The present invention relates to a display device.

Background

At present, a plurality of naked-eye 3D display technologies can be roughly divided into three technical forms, namely, holographic display, multilayer splicing and parallax simulation. The multilayer splicing mode is that a fast moving display is utilized, and the visual persistence of a viewer is matched, so that a plane picture emitted by the display generates a three-dimensional visual effect on the brain of the viewer. In addition, the mode of multilayer splicing does not generate uncomfortable feeling of convergence regulation conflict of vision like parallax simulation, and complex equipment of a holographic display mode is not needed. However, the multi-layer tiled 3D display requires a large space for fast moving the display, and therefore, it is highly desirable to develop a multi-layer tiled 3D display that can reduce the space requirement.

Disclosure of Invention

The invention provides a display device, which utilizes multi-layer spliced 2D images to achieve a three-dimensional visual effect and does not need a large space.

According to an embodiment of the present invention, there is provided a display device including a first optical mirror, a second optical mirror, a flat panel display, a polarization selection layer, and a quarter wave plate. The first optical lens has a first focus, a first central axis, and a first concave surface having the first central axis as a symmetry axis. The second optical lens is provided with a second focus, a second middle axis and a second concave surface which takes the second middle axis as a symmetry axis, wherein the first concave surface faces the second concave surface, and the first middle axis and the second middle axis are overlapped. The flat panel display comprises a display surface, wherein the display surface is arranged on the first focus and faces the first concave surface, and the normal of the display surface is parallel to the first central axis. The polarization selection layer is arranged on the first concave surface and is provided with a penetrating shaft. The quarter-wave plate is arranged on the second concave surface, wherein the polarization direction of the image light emitted by the display surface is vertical to the transmission axis of the polarization selection layer.

Based on the above, the display device provided by the embodiment of the invention uses the optical imaging principle to image the plane image provided by the flat panel display on the side outside the display device and adjacent to the first optical mirror. When the focal position of the second optical lens is changed and the persistence of vision of the viewer is matched, the three-dimensional visual effect can be achieved, and the display device does not need a large space.

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 a display device of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a 3D image according to an embodiment of the invention;

fig. 3 is a partial structural schematic diagram of a second optical lens according to an embodiment of the present invention.

Description of the symbols

1 display device

100 display

100D display surface

101 first optical lens

101P polarization selection layer

102. 202 second optical lens

102H through hole

102W quarter-wave plate

102S bracket

202R high reflection layer

C1, C2 as middle shaft

D1, D2, D3, di image

EY eye

F1, F2 focal point

L1, L2, li, R10, R20, ri0, R11, R21, ri1, T2, ti, image light V1, V2, concave surface

Detailed Description

Refer to fig. 1 and 2. The display device 1 includes a flat display 100, a first optical mirror 101, a second optical mirror 102, a quarter-wave plate 102W, and a polarization selection layer 101P. The first optical lens 101 includes a focal point F1, a first central axis C1, and a first concave surface V1 having the first central axis C1 as a symmetry axis. The second optical lens 102 has a focal point F2, a second central axis C2, and a second concave surface V2 with the second central axis C2 as a symmetry axis, wherein the first concave surface V1 faces the second concave surface V2, and the first central axis C1 overlaps the second central axis C2. The flat panel display 100 includes a display surface 100D, wherein the display surface 100D is disposed at the focal point F1 and faces the first concave surface V1, and a normal of the display surface 100D is parallel to the first central axis C1. The quarter wave plate 102W is disposed on the second concave surface V2.

The display surface 100D emits different images Di at different times as shown in fig. 2. For example, image D1 is rendered at a first time, image D2 is rendered at a second time, image D3 is rendered at a third time, and so on. Each image Di is a two-dimensional planar image.

Each image Di emitted from the display surface 100D is composed of a plurality of image lights Li directed in different directions. The image lights Li travel toward the first concave surface V1 (for the sake of understanding, only two exemplary image lights L1 and L2 are shown in fig. 1). The polarization selection layer 101P is disposed on the first concave surface V1 and has a transmission axis. In the present embodiment, the plurality of image lights Li emitted from the display surface 100D are s-lights, and the polarization direction thereof is perpendicular to the transmission axis of the polarization selection layer 101P. That is, the polarization direction of the image lights Li emitted from the display surface 100D is perpendicular to the transmission axis of the polarization selection layer 101P, so that the image lights Li do not transmit through the polarization selection layer 101P and are reflected by the polarization selection layer 101P. However, the embodiments of the present invention are not limited thereto, and in some embodiments, the plurality of image lights Li emitted from the display surface 100D may be P-lights, and the polarization selection layer 101P is configured such that the transmission axis thereof is perpendicular to the polarization direction of the P-lights. In some embodiments, the polarization selection layer 101P is, for example, a birefringent polymeric multilayer film (DBEF).

Since the display surface 100D is disposed at the focal point F1, the plurality of image lights Li reflected by the polarization selection layer 101P are respectively formed as a plurality of image lights Ri0 substantially parallel to each other. For example, as shown in fig. 1, the image lights L1 and L2 are reflected by the polarization selection layer 101P to form image lights R10 and R20, respectively, wherein the image lights R10 and R20 are substantially parallel. Specifically, since the thickness of the polarization selection layer 101P is small, the reflection surface of the polarization selection layer 101P facing the display surface 100D can be regarded as being located at the same position as the first concave surface V1. The display surface 100D disposed at the focal point F1 of the first concave surface V1 can be regarded as a focal point of the above-described reflection surface disposed on the polarization selection layer 101P. Therefore, according to the concave mirror imaging principle, the light beam emitted from the display surface 100D is reflected by the reflection surface of the polarization selection layer 101P and then travels parallel to the first central axis C1 of the first concave surface V1. Therefore, the image lights Ri0 are substantially parallel to each other.

The image lights Ri0 enter the quarter-wave plate 102W, are reflected by the second concave V2, and then penetrate the quarter-wave plate 102W to form image lights Ri1. Since the quarter-wave plate 102W is penetrated twice, the polarization direction of the image lights Ri1 is perpendicular to the polarization direction of the image lights Ri0 (i.e. the image lights Ri1 are P lights), so that the image lights Ri1 penetrate through the polarization selection layer 101P and the first optical lens 101 to form image lights Ti, and are imaged on the focal point F2 of the second optical lens 102. In other words, with the above configuration, the plurality of images Di emitted from the display surface 100D can be imaged on the focal point F2 of the second optical mirror 102.

In the present embodiment, the focal length of the second optical mirror 102 is greater than that of the first optical mirror 101, so that a plurality of images Di can be imaged outside the display device 1 and on a side adjacent to the first optical mirror 101, and each image Di can be seen by the viewer's eye EY at the focal point F2. In an embodiment of the invention, the thickness of the first optical lens 101 is uniform, so that the image Di formed by the image lights Ti penetrating different portions of the first optical lens 101 is not deformed. However, the embodiment of the present invention is not limited thereto, and the thickness of the first optical lens 101 may be configured to be non-uniform according to the requirement. In one embodiment, the vertical projection of the second concave surface V2 on a plane perpendicular to the first central axis C1 is greater than or equal to the vertical projection of the first concave surface V1, so as to ensure that the plurality of image lights Ri0 reflected from the reflective surface of the polarization selective layer 101P can be reflected by the second concave surface V2.

In an embodiment of the invention, the first concave surface V1 is a spherical surface, and the display surface 100D is located within a viewing angle of ± 3 degrees with respect to the first central axis C1 of the first concave surface V1. In this embodiment, the first concave surface V1 is formed as a spherical surface to reduce the manufacturing cost, and the purpose of the display surface 100D falling within the viewing angle of ± 3 degrees with respect to the symmetry center of the first concave surface V1 is to enable the display surface 100D to approach the point light source with respect to the first concave surface V1 to avoid various aberrations.

In an embodiment of the invention, the first concave surface V1 is configured to be aspheric, so that the plurality of image lights Ri0 formed after being reflected by the polarization selection layer 101P can be parallel to each other and parallel to the first central axis C1, so as to further focus the plurality of image lights Ti on the focal point F2 of the second optical lens 102, optimize the imaging condition of each image Di, and avoid various aberrations.

In an embodiment of the present invention, the second concave surface V2 is also configured to be an aspheric surface, so that the plurality of image lights Ti can be focused on the focal point F2 of the second optical lens 102, and the imaging condition of each image Di is optimized, thereby avoiding various aberrations.

In order to fully illustrate various aspects of the invention, other embodiments of the invention are described below. It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

Referring to fig. 3, a schematic diagram of a partial structure of a second optical lens according to an embodiment of the invention is shown. In this embodiment, the second optical mirror 202 includes a high reflective layer 202R disposed between the second concave surface V2 and the quarter-wave plate 102W to increase the reflectivity of the image light Ri0. The highly reflective layer 202R may contain, for example, silver, aluminum, or the like.

Referring back to fig. 1, the display device 1 may further include a plurality of holders 102S disposed on the other side of the second optical lens 102 opposite to the second concave surface V2 for support. However, the invention is not limited thereto, in some embodiments, the supports 102S may be connected to a moving mechanism (not shown) to translate the second optical lens 102 in a direction along the second central axis C2, and correspondingly change the position of the focal point F2 of the second optical lens 102, so that different images Di emitted by the display surface 100D at different times are imaged at different positions in space, and the plurality of planar images Di generated by the display device 1 may form a stereoscopic image on the brain of the viewer in cooperation with the persistence of vision of the viewer, as shown in fig. 2.

It should be noted that during the translation of the second optic 102, the position of the display surface 100D does not change, but is maintained at the focal point F1 of the first concave surface V1. In the embodiment shown in fig. 1, the second optical lens 102 has a through hole 102H, the through hole 102H is located on the second central axis C2, and the flat panel display 100 is disposed in the through hole 102H. The flat panel display 100 is not connected to the second optic 102, so that the position of the display surface 100D may not change during the translation of the second optic 102.

In an embodiment of the invention, the plurality of supports 102S are configured to change the surface shape of the second concave surface V2, for example, change the curvature radius thereof, so as to change the position of the focal point F2 of the second optical lens 102, so that different images Di emitted by the display surface 100D at different times are imaged at different positions in space, and the plurality of planar images Di generated by the display device 1 can form a stereoscopic image in the brain of the viewer in cooperation with the persistence of vision of the viewer.

In summary, the display device provided by the embodiments of the invention utilizes the optical imaging principle to image the planar image provided by the planar display on the side outside the display device and adjacent to the first optical mirror. When the focal position of the second optical lens is changed and the persistence of vision of the viewer is matched, the three-dimensional visual effect can be achieved, and the display device does not need a large space.

Claims

1. A display device, comprising:

a first optical lens having a first focus, a first central axis, and a first concave surface having the first central axis as a symmetry axis;

a second optical mirror having a second focal point, a second central axis, and a second concave surface having the second central axis as a symmetry axis, wherein the first concave surface faces the second concave surface, and the first central axis overlaps the second central axis;

the plane display comprises a display surface, wherein the display surface is configured at the first focus and faces the first concave surface, and the normal of the display surface is parallel to the first central axis;

a polarization selection layer disposed on the first concave surface and having a transmission axis; and

a quarter wave plate disposed on the second concave surface,

wherein the polarization direction of the image light emitted from the display surface is perpendicular to the transmission axis of the polarization selection layer.

2. The display device of claim 1, wherein the first optic is uniform in thickness.

3. The display device according to claim 1, wherein the polarization selection layer is a birefringent polymer multilayer film.

4. The display apparatus of claim 1, wherein the first concave surface is aspheric, and the image light travels in a direction parallel to the first central axis after being reflected by the first concave surface.

5. The display apparatus of claim 1, wherein the first concave surface is spherical and the display surface falls within a viewing angle of ± 3 degrees with respect to a center of symmetry of the first concave surface.

6. The display apparatus of claim 1, wherein the second concave surface is aspheric, and the image light converges at the second focal point after being reflected by the second concave surface.

7. The display device of claim 1, wherein a perpendicular projection of the second concave surface onto a plane perpendicular to the first central axis is greater than or equal to a perpendicular projection of the first concave surface.

8. The display device of claim 1, wherein a focal length of the second concave surface is greater than a focal length of the first concave surface.

9. The display device of claim 1, further comprising a highly reflective layer disposed between the second concave surface and the quarter-wave plate.

10. The display device of claim 1, further comprising a plurality of standoffs disposed on another side of the second optic opposite the second concave surface.

11. The display device of claim 10, wherein the plurality of supports are configured to translate the second optic in a direction along the second central axis.

12. The display device of claim 10, wherein the plurality of brackets are configured to change a profile of the second concave surface.

13. The display apparatus of claim 1, wherein the second optic is provided with a through hole located on the second central axis, and the flat panel display is disposed within the through hole.