DISPLAY DEVICE

A display device is provided, including a display screen; a first polarizer arranged on a light-emitting surface of the display screen; a light splitting sheet arranged on a side of the first polarizer away from the display screen, wherein a direction of a light transmission axis of the light splitting sheet is consistent with a direction of a light transmission axis of the first polarizer; a first quarter-wave plate arranged on a side of the light splitting sheet away from the first polarizer; a first lens arranged on a side of the first quarter-wave plate away from the light splitting sheet; and a transflective film arranged on a side of the first lens away from the first quarter-wave plate.

FIELD OF INVENTION

The invention relates to the field of display technology, and particularly to a display device.

BACKGROUND

Virtual reality (VR) technology is a way of enlarging and projecting virtual scenes, which can better enhance the sense of immersion. In recent years, with the continuous development of near-eye display technology, near-eye display products using VR technology have gradually been widely used in fields such as film and television, education, and medical.

An optical system of conventional VR display products generally only has a single-piece lens. Due to imaging requirements of an optical path, a display screen is far away from the lens, resulting in a larger size of a VR display product, which is not conducive to the miniaturization of the device.

SUMMARY

Embodiments of the present invention provides a display device to improve technical problems in current VR near-eye display products that the display screen is far away from the lens due to imaging requirements of an optical path, thereby resulting in a larger size of VR near-eye display products.

In order to solve the above-mentioned technical problems, technical solutions provided by the application are as follows:

The present application provides a display device, comprising:a display screen;a first polarizer arranged on a light-emitting surface of the display screen;a light splitting sheet arranged on a side of the first polarizer away from the display screen, wherein a direction of a light transmission axis of the light splitting sheet is consistent with a direction of a light transmission axis of the first polarizer;a first quarter-wave plate arranged on a side of the light splitting sheet away from the first polarizer;a first lens arranged on a side of the first quarter-wave plate away from the light splitting sheet; anda transflective film arranged on a side of the first lens away from the first quarter-wave plate.

In the display device of the present application, the light splitting sheet is attached to a side surface of the side of the first polarizer away from the display screen, and the first quarter-wave plate is attached to a side surface of the side of the light splitting sheet away from the first polarizer.

In the display device of the present application, the light splitting sheet is attached to a side surface of the side of the first polarizer away from the display screen, and the first quarter-wave plate is attached to a side surface of a side of the first lens close to the display screen.

In the display device of the present application, the display device further comprises a second quarter-wave plate and a second polarizer, and the second quarter-wave plate is arranged on a side of transflective film away from the first lens, and the second polarizer is arranged on a side of the second quarter-wave plate away from the transflective film; andwherein a slow axis of the second quarter-wave plate is perpendicular to a slow axis of the first quarter-wave plate, and a light transmission axis of the second polarizer is perpendicular to the light transmission axis of the first polarizer.

In the display device of the present application, the display device further comprises a second lens arranged on a side of the first lens away from the display screen; andwherein the transflective film is disposed between the first lens and the second lens, and the second quarter-wave plate and the second polarizer are located a side of the second lens away from the first lens.

In the display device of the present application, the transflective film is attached to a side surface of the side of the first lens close to the second lens; andwherein the second quarter-wave plate is attached to the side surface of the second lens away from the first lens.

In the display device of the present application, the transflective film is attached to a side surface of the side of the second lens close to the side of the first lens; andwherein the first quarter-wave plate is attached to a side surface of the side of the first lens away from the second lens.

In the display device of the present application, the second polarizer is attached to a side surface of the side of the second quarter-wave plate away from the second lens; andwherein the light splitting sheet is attached to a side surface of the side of the first polarizer away from the display screen.

In the display device of the present application, the first lens has a first focal length, and a distance from the display screen to a center point of the first lens along a direction from the first lens to the display screen is less than or equal to the first focal length.

In the display device of the present application, the second lens has a second focal length; andwherein a distance from the center point of the first lens to a center point of the second lens is less than or equal to the first focal length or/and the second focal length.

In the present application, a first polarizer, a light splitting sheet, a first quarter-wave plate, a first lens and a transflective film are sequentially arranged on the light-emitting side of the display screen, so that the emitting light becomes first linearly polarized light after passing through the first polarizer. The first linearly polarized light is modulated into first circularly polarized light after passing through the light splitting sheet and the first quarter-wave plate and is incident on the first lens, and a part of the first circularly polarized light passes through the first lens and the transflective film, so that an human eye can observe a first virtual image on a backlight side of the display screen. Another part of the first circularly polarized light is reflected back by the transflective film to become second circularly polarized light, the second circularly polarized light is incident on the first quarter-wave plate and is modulated into the first linearly polarized light to incident on the light splitting sheet. After being reflected by the light splitting sheet, it becomes the second linearly polarized light and is incident on the first quarter-wave plate. The first quarter-wave plate modulates the second linearly polarized light into the second circularly polarized light and reflects it back to the first lens and the transflective film. The second circularly polarized light is transmitted through the first lens and the transflective film, so that the human eye can observe the second virtual image located on a backlight side of the display screen, and the second virtual image does not overlap with the first virtual image. In the present application, through the above settings, a part of the light emitted from the display screen can be reflected and refracted for multiple times between the first lens and the display screen, so that a light output path of the display screen100can be folded, which greatly increases an effective optical path of light propagation and can reduce a distance between the display screen and the first lens, thereby reducing a size of a VR near-eye display product and realizing the miniaturization of the product. Moreover, since the first virtual image and the second virtual image that do not overlap can be observed by the human eye, the present application can also realize an image display of two image planes, so that the human eye can see a 3D images with two depths of field, thereby enhancing a stereoscopic display sense.

DETAILED DESCRIPTION

Technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, but not to limit the present application. In this application, unless otherwise stated, the directional words used such as “upper” and “lower” generally refer to the upper and lower sides of the device in actual use or working state, specifically the drawing direction in the accompanying drawings while “inside” and “outside” refer to the outline of the device.

Virtual reality (VR) technology is a way of enlarging and projecting virtual scenes, which can better enhance the sense of immersion. An optical system of conventional VR display products generally only has a single-piece lens. Due to imaging requirements of an optical path, a display screen is far away from the lens, resulting in a larger size of a VR display product, which is not conducive to the miniaturization of the device. The present application proposes following solutions based on the above technical problems.

Referring toFIGS.1to7, the present application provides a display device comprising a display screen100, a first polarizer200arranged on a light-emitting surface of the display screen100, a light splitting sheet300arranged on a side of the first polarizer200away from the display screen100, a first quarter-wave plate400arranged on a side of the light splitting sheet300away from the first polarizer200, a first lens500arranged on a side of the first quarter-wave plate400away from the light splitting sheet300and a transflective film600arranged on a side of the first lens500away from the first quarter-wave plate400. A direction of a light transmission axis of the light splitting sheet300is consistent with a direction of a light transmission axis of the first polarizer200, and the first lens500and the display screen100are separately arranged.

In the present application, the first polarizer200, the light splitting sheet300, the first quarter-wave plate400, the first lens500and the transflective film600are sequentially arranged on the light-emitting side of the display screen100, so that the emitting light becomes first linearly polarized light after passing through the first polarizer200. The first linearly polarized light is modulated into first circularly polarized light after passing through the light splitting sheet300and the first quarter-wave plate400and is incident on the first lens500, and a part of the first circularly polarized light passes through the first lens500and the transflective film600, so that an human eye can observe a first virtual image on a backlight side of the display screen100. Another part of the first circularly polarized light is reflected back by the transflective film600to become second circularly polarized light, the second circularly polarized light is incident on the first quarter-wave plate400and is modulated into the first linearly polarized light to incident on the light splitting sheet. After being reflected by the light splitting sheet300, it becomes the second linearly polarized light and is incident on the first quarter-wave plate400. The first quarter-wave plate400modulates the second linearly polarized light into the second circularly polarized light and reflects it back to the first lens500and the transflective film600. The second circularly polarized light is transmitted through the first lens500and the transflective film600, so that the human eye can observe the second virtual image located on a backlight side of the display screen100, and the second virtual image does not overlap with the first virtual image.

In the present application, through the above settings, a part of the light emitted from the display screen100can be reflected and refracted for multiple times between the first lens500and the display screen100, so that a light output path of the display screen100can be folded, which greatly increases an effective optical path of light propagation and can reduce a distance between the display screen100and the first lens500, thereby reducing a size of a VR near-eye display product and realizing the miniaturization of the product. Moreover, since the first virtual image and the second virtual image that do not overlap can be observed by the human eye, the present application can also realize an image display of two image planes, so that the human eye can see a 3D images with two depths of field, thereby enhancing a stereoscopic display sense.

Technical solutions of the present application will now be described with reference to specific embodiments. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

In this embodiment, the display screen100may be a liquid crystal display screen, an LED display screen, a mini-LED display screen, a micro-LED display screen, an OLED display screen, or the like.

In this embodiment, the first polarizer200is a linear polarizer, and a direction of the light transmission axis of the light splitting sheet300is consistent with a direction of the light transmission axis of the first polarizer200. It can be understood that the polarized light having the same vibration direction can pass through the light splitting sheet300and the first polarizer200.

In this embodiment, the first quarter-wave plate400can modulate linearly polarized light into circularly polarized light, and can modulate circularly polarized light into linearly polarized light.

In this embodiment, the first lens500may be a convex lens or a concave lens, a material of the first lens500may be glass or plastic material, and a type of the first lens500may be a common lens, a micro lens array, a Fresnel lens, a liquid crystal lens, and other holographic elements that can realize the imaging function of lenses.

In this embodiment, the transflective film600can reflect and transmit the incident light, that is, part of the light is reflected back and part of the light passes through when the incident light passes through the transflective film600, and the transflective film600can be embodied as a coating film or a coating film.

Referring toFIG.1, in the display device of the present application, the light splitting sheet300can be arranged on a side surface of a side of the first polarizer200away from the display screen100. That is, the light splitting sheet300can be attached to the first polarizer200on the display screen100, or the light splitting sheet300may be arranged on the first polarizer200by coating, film-coating, or the like.

In this embodiment, the first quarter-wave plate400may be arranged on a side surface of a side of the light splitting sheet300away from the first polarizer200. That is, the first quarter-wave plate400may be attached to a side surface of the light splitting sheet300, or the first quarter-wave plate400may be arranged on the light splitting sheet300by coating, film-coating, or the like.

In this embodiment, the first quarter-wave plate400and the first lens500may be separately arranged. In this case, the display screen100, the first polarizer200, the light splitting sheet300and the first quarter-wave plate400can be combined as an assembly, and there is a gap between the combined assembly and the first lens500, so that the light emitted from the display screen100can be fully refracted by the first lens500to improve imaging quality.

Referring toFIG.2, in the display device of the present application, the light splitting sheet300can be arranged on a side surface of a side of the first polarizer200away from the display screen100. That is, the light splitting sheet300can be attached to the first polarizer200on the display screen100, or the light splitting sheet300may be formed on the first polarizer200by coating, film-coating, or the like.

In this embodiment, the first quarter-wave plate400may be arranged on a side surface of a side of the first lens500close to the display screen100. That is, the first quarter-wave plate400may be attached to the first lens500, or the first quarter-wave plate400may be formed on the first lens500by coating, film-coating, or the like.

In this embodiment, the light splitting sheet300and the first quarter-wave plate400can be separated arranged. In this case, the display screen100, the first polarizer200and the light splitting sheet300are combined as an assembly, the first quarter-wave plate400and the first lens500are combined as an assembly, and there is a gap between the combined assembly of the display screen100, the first polarizer200and the light splitting sheet300and the combined assembly of the first quarter-wave plate400and the first lens500, so that the light emitted from the display screen100can be fully refracted by the first lens500, thereby improving the imaging quality.

Please refer toFIG.3, in the display device of the present application, the first quarter-wave plate400may be arranged on a side surface of a side of the first lens500close to the display screen100. That is, the first quarter-wave plate400may be attached to a surface of the first lens500, or the first quarter-wave plate400may be formed on the first lens500by coating, film-coating, or the like.

In this embodiment, the light splitting sheet300may be arranged on a side surface of a side of the first quarter-wave plate400away from the first lens500. That is, the light splitting sheet300may be attached to the first quarter-wave plate400, or the light splitting sheet300may be formed on the first quarter-wave plate400by coating, film-coating, or the like.

In this embodiment, the light splitting sheet300and the first polarizer200can be separately arranged. In this case, the display screen100and the first polarizer200are combined as an assembly, and the light splitting sheet300, the first quarter-wave plate400and the first lens500are combined as an assembly, and there is a gap between the combined assembly of the display screen100and the first polarizer200and the combined assembly of the quarter-wave plate400and the first lens500, so that the light emitted from the display screen100can be fully refracted by the first lens500, thereby improving the imaging quality.

Referring toFIGS.4to6, in the display device of the present application, the display device may further include a second quarter-wave plate800and a second polarizer900. The second quarter-wave plate800is arranged on a side of the transflective film600away from the first lens500, and the second polarizer900is arranged on a side of the second quarter-wave plate800away from the transflective film600. A slow axis of the second quarter-wave plate800is perpendicular to a slow axis of the first quarter-wave plate400, and a light transmission axis of the second polarizer900is perpendicular to a light transmission axis of the first polarizer200.

Referring toFIG.4, in this embodiment, the light emitted from the display screen100becomes first linearly polarized light after passing through the first polarizer200, and the first linearly polarized light is then modulated into a first circularly polarized light after passing through the light splitting sheet300and the quarter-wave plate400to incident on the first lens500. A part of the first circularly polarized light passes through the first lens500and the transflective film600, and the other part of the circularly polarized light is reflected back by the transflective film600to become a second circularly polarized light.

The first circularly polarized light passing through the first lens500and the transflective film600is modulated into the first linearly polarized light after passing through the second quarter-wave plate800. A transmission axis of the first polarizer200is perpendicular to a transmission axis of the first polarizer200, so the first linearly polarized light will be absorbed after entering the second polarizer900and fails to enter the human eye for imaging.

The other part of the first circularly polarized light reflected by the transflective film600becomes the second circularly polarized light. The second circularly polarized light emitted on the first quarter-wave plate400is modulated as the first linearly polarized light to incident on the light splitting sheet300and becomes the second linearly polarized light to incident on the first quarter-wave plate400after being reflected by the light splitting sheet300. The first quarter-wave plate400modulates the second linearly polarized light into a second circularly polarized light and reflects it back to the first lens500and the transflective film600, and the second circularly polarized light passes through the second quarter-wave plate800after passing through the first lens500and the transflective film600and becomes the second linearly polarized light. Since the transmission axis of the second polarizer900is perpendicular to the transmission axis of the first polarizer200, the second linearly polarized light can pass through the second polarizer900and enter the human eye for imaging.

In this embodiment, the second quarter-wave plate800and the second polarizer900are sequentially arranged on the side of the first lens500away from the display screen100, so that a part of the emitted light of the display screen100becomes the first linearly polarized light after passing through the first lens500and the transflective film600, which is absorbed by the second polarizer900and cannot enter the human eye for imaging. The other part of the emitted light of the assembly display screen100reflected by the transflective film600finally becomes the second linearly polarized light and passes through the second polarizer900after multiple refraction and reflection between the first quarter-wave plate400, the light splitting sheet300, the transflective film600and the second quarter-wave plate800, so that the human eye can see a virtual image formed by passing the first circularly polarized light through the first lens500which was previously reflected by the transflective film600.

Through the above-mentioned settings in this embodiment, the light emitting path of the display screen100can also be folded, which greatly increases an effective optical path of light propagation, thereby reducing a distance between the display screen100and the first lens500, thereby reducing The size of the VT near-eye displaying product to realize the miniaturization of the product.

It should be noted that the virtual image viewed by the human eye in this embodiment is different from the first virtual image and the second virtual image described in other embodiments. The main difference is that in this embodiment, the human eye can only see one virtual image. The virtual image is formed by the last emitted second linearly polarized light, while in other embodiments, the human eye can see two non-overlapping virtual images, and the two virtual images are formed by the last emitted second circularly polarized light. Compared with other embodiments, although there is only one imaging plane and a 3D display cannot be realized in this embodiment, the imaging is clearer and the visual experience is better.

Referring toFIG.5andFIG.6, in the display device of the present application, the display device may further include a second lens700arranged on a side of the first lens500away from the display screen100. The second lens700can also be a convex lens or a concave lens, a material of the second lens700can be glass or plastic material, and its type can be a common lens, a micro lens array, a Fresnel lens, a liquid crystal lens, and other lenses that can be realized imaging function of holographic elements, or the like.

In this embodiment, the transflective film600may be disposed between the first lens500and the second lens700, so that the second lens700can condense the light passing through the transflective film600to increase an amount of light entering the human eye and a brightness of the light emitted, and improve a visual experience of the human eye.

In this embodiment, the second quarter-wave plate800and the second polarizer900may be located on the side of the second lens700away from the first lens500, so that the second lens700can condense more light incident to the second quarter-wave plate800and the second polarizer900, thereby increasing the light output modulated by the second quarter-wave plate800and increasing the amount of light entering people. The light output and brightness of the eye can improve the visual experience of the human eye.

Please refer toFIG.5, in the display device of the present application, the transflective film600may be arranged on a side surface of the side of the first lens500close to the second lens700. At this time, the transflective film600may be attached to the surface of the first lens500on the side away from the display screen100, or the transflective film600may be formed on the first lens500by coating, film-coating or the like.

In this embodiment, a main light transmittance axis of the first lens500and the main light transmittance axis of the second lens700are arranged to coincide, and the first lens500and the second lens700are disposed separately along a direction of the main light transmittance of the first lens500or the second lens700. In other words, there is a gap between the first lens500and the second lens700along the direction of their main light transmittance axes.

In this embodiment, since the transflective film600is arranged on the surface of the first lens500, the transflective film600and the second lens700are also arranged separately.

In this embodiment, by arranged the transflective film600on the side of the first lens500close to the second lens700, the first lens500plays a rigid supporting role to the transflective film600, and the transflective film600is not prone to wrinkles or cracks, so as to stably refract or reflect the light passing through the first lens500and improve the final imaging quality.

Referring toFIG.6, in the display device of the present application, the transflective film600may be arranged on a side surface of the side of the second lens700close to the first lens500. At this time, the transflective film600may be attached to the surface of the second lens700on the side close to the first lens500, or the transflective film600may be formed on the surface of the second lens700by coating, film-coating or the like.

In this embodiment, the main light transmittance axis of the first lens500and the main light transmittance axis of the second lens700are arranged to coincide, and the first lens500or the second lens700are arrange separately along the light transmittance axis of the first lens500or the second lens700. In other words, there is a gap between the first lens500and the second lens700along the direction of their main light transmittance axis.

In this embodiment, since the transflective film600is arranged on the surface of the second lens700, the transflective film600and the first lens500are also arranged separately.

In this embodiment, by disposing the transflective film600on the surface of the second lens700close to the first lens500, the second lens700plays a rigid supporting role to the transflective film600, and the transflective film600is not prone to wrinkles or cracks, so as to stably refract or reflect the light passing through the first lens500and improve the final imaging quality.

Please refer toFIG.5andFIG.6, in the display device of the present application, the second quarter-wave plate800may be arranged on a side surface of the side of the second lens700away from the first lens500. In this case, the second quarter-wave plate800can be attached to the surface of the second lens700on the side away from the first lens500, or the second quarter-wave plate800can be formed on the second lens700by coating, film-coating, or the like.

In this embodiment, the second polarizer900may be arranged on a side surface of the side of the second quarter-wave plate800away from the second lens700. In this case, the second polarizer900may be attached to the surface on the side away from the second lens700. Alternatively, the second polarizer900can be formed on the second quarter-wave plate800by coating, film-coating, or the like.

In this embodiment, the second quarter-wave plate800is arranged on the surface of the second lens700away from the first lens500, and the second polarizer900is arranged on the surface of the second quarter-wave plate800away from the second lens700, the second lens700can rigidly support the second quarter-wave plate800and the second polarizer900. The second quarter-wave plate800and the second polarizer900are not prone to wrinkles or cracks, so as to stably refract the light passing through the second lens700and improve the final image quality.

Referring toFIG.7, in the display device of the present application, the first lens500has a first focal length O1F1, and a connection line of between the center point O1 of the first lens500and the center point O2 of the second lens700is parallel to a direction from the first lens500to the second lens700.

In this embodiment, the connection line of the center point O1 of the first lens500and the center point O2 of the second lens700is parallel to the main light transmittance axis of the first lens500or/and the second lens700. That is, the direction from the first lens500to the second lens700is parallel to the main light transmittance axis of the first lens500or/and the second lens700.

In this embodiment, a distance d from the center point O1 of the first lens500to the center point O2 of the second lens700may be smaller than or equal to the first focal length O1F1 or/and the second focal length O2F2, so as to optimize the distance between the first lens500and the second lens700. The light passing through the first lens500can be efficiently condensed by the second lens700, so as to increase the light output that finally reaches the human eye, and improve the visual experience of the final virtual image viewed by the human eye.

In the embodiment of the present application, by sequentially arranging the first polarizer200, the light splitting sheet300, the first quarter-wave plate400, the first lens500, the transflective film600, the second quarter-wave plate800and the second polarizer900on the light-emitting side of the display screen100, the light emitted from the display screen100undergoes multiple reflections and refractions are performed between the light splitting sheet300, the first quarter-wave plate400, the first lens500, the transflective film600, and the second quarter-wave plate800and finally becomes the second linearly polarized light and passes through the second polarizer900, so that it can enter the human eye for imaging. This stacking structure can realize the folding of the light emitting path of the display screen100, greatly increase the effective optical path of light propagation, thereby reducing a gap between the display screen100and the first lens500, thereby reducing the size of the VR near-eye display product and achieve miniaturization of the product.

The display device provided by the embodiments of the present invention is described in detail above. While the present disclosure has been described with the aforementioned preferred embodiments, it is preferable that the above embodiments should not be construed as limiting of the present disclosure. Anyone having ordinary skill in the art can make a variety of modifications and variations without departing from the spirit and scope of the present disclosure as defined by the following claims.