Display device and virtual reality display apparatus

Abstract

This invention discloses a display device and a virtual reality display device. The display device includes a first display screen, a second display screen, and a preset optical element. The second display screen includes a first region and a second region. The first display screen emits first image light rays, which are incident on the first region of the second display screen via the preset optical element. The first region reflects the first image light rays, and the second region emits second image light rays. The first image light rays reflected from the first region and the second image light rays emitted from the second region combine to form the image light rays emitted by the display device, which are then separated from the first image light rays from the first display screen via the preset optical element. The display device presents an image formed by combining the image displayed on the first display screen and the image displayed in the second region. The image resolution of the image displayed on the first display screen can be high, and the size of the second region of the second display screen can be large, thus satisfying both the image resolution requirements and the viewing angle requirements.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device. This invention also relates to a virtual reality display device. Background Technology

[0002] For Virtual Reality (VR) display devices, a high image resolution is required for a good viewing experience, while a wide viewing angle is needed for a better sense of immersion. However, existing VR display devices, while meeting the image resolution requirements, cannot meet the corresponding viewing angle requirements. For example, if a VR device uses a silicon-based display and its image resolution reaches the level of human eye resolution, the size of the silicon display is limited by its exposure range, thus restricting the viewing angle. For instance, current VR devices using silicon-based displays only have a viewing angle of 60°-90°, significantly reducing the user's immersive experience. Summary of the Invention

[0003] The purpose of this invention is to provide a display device for use in virtual reality display equipment, which can meet the user's requirements for image resolution and viewing angle. This invention also provides a virtual reality display device.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A display device includes a first display screen, a second display screen, and preset optical elements, wherein the second display screen includes a first area and a second area;

[0006] The first display screen is used to emit a first image light, which passes through the preset optical element and enters the first area of ​​the second display screen. The first area of ​​the second display screen is used to reflect the first image light, and the second area of ​​the second display screen is used to emit a second image light, so that the first image light reflected from the first area and the second image light emitted from the second area combine to form the image light emitted by the display device.

[0007] The first image light reflected from the first region and the second image light emitted from the second region are emitted through the preset optical element, so that the first image light reflected from the first region and the second image light emitted from the second region are separated from the first image light from the first display screen.

[0008] Optionally, the first area of ​​the second display screen includes a liquid crystal layer, an electrode, and a reflective surface. The reflective surface and the liquid crystal layer are arranged sequentially along the light emission direction of the second display screen. The electrode is connected to the liquid crystal layer and is used to supply power to the liquid crystal layer to control whether the liquid crystal layer is light-transmitting or not.

[0009] The reflective surface is used to reflect the first image light incident on the reflective surface that passes through the liquid crystal layer when the liquid crystal layer is transparent.

[0010] Optionally, the liquid crystal layer includes a plurality of liquid crystal cells, each of which is connected to a corresponding electrode to independently control whether each liquid crystal cell is light-transmitting or light-blocking.

[0011] Optionally, the first area of ​​the second display screen includes a reflective surface for reflecting the first image light incident on the reflective surface.

[0012] Optionally, the second area of ​​the second display screen includes a liquid crystal display screen, and the first display screen includes a silicon-based display screen.

[0013] Optionally, the image resolution of the image displayed on the first display screen is greater than the image resolution of the image displayed in the second area of ​​the second display screen, and the first area of ​​the second display screen is located in the middle area of ​​the second display screen.

[0014] Optionally, the brightness of the first image light emitted by the first display screen is greater than the brightness of the second image light emitted by the second area of ​​the second display screen.

[0015] Optionally, the preset optical element is a semi-transparent and semi-reflective element, which is used to reflect the first image light from the first display screen to the first area of ​​the second display screen, and to transmit the first image light reflected from the first area and the second image light emitted from the second area.

[0016] Optionally, the preset optical element includes a third region and a fourth region. The first image light emitted from the first display screen is incident on the third region of the preset optical element and reflected by the third region to the first region of the second display screen. The first image light reflected from the first region passes through the third region of the preset optical element, and the second image light emitted from the second region passes through the fourth region of the preset optical element.

[0017] A virtual reality display device includes the display apparatus described in any one of the above claims.

[0018] As can be seen from the above technical solution, the display device provided by the present invention includes a first display screen, a second display screen, and a preset optical element. The second display screen includes a first region and a second region. The first display screen emits first image light rays, which are incident on the first region of the second display screen through the preset optical element. The first region of the second display screen is used to reflect the first image light rays. The second region of the second display screen emits second image light rays, so that the first image light rays reflected from the first region and the second image light rays emitted from the second region combine to form image light rays emitted by the display device. The first image light rays reflected from the first region and the second image light rays emitted from the second region are emitted through the preset optical element, so that the first image light rays reflected from the first region and the second image light rays emitted from the second region are separated from the first image light rays from the first display screen.

[0019] The display device of this invention presents an image formed by combining an image displayed on a first display screen and an image displayed in a second area of ​​a second display screen. The image displayed on the first display screen is presented through a first area of ​​the second display screen, which corresponds to the area that the user's eyes focus on most when viewing the image. The image resolution of the first display screen can be relatively high, ensuring that the image presented by this display device meets the user's requirements for display resolution. Meanwhile, the size of the second area of ​​the second display screen can be relatively large, ensuring that the viewing angle of the image presented by this display device meets the requirements. Therefore, the display device of this invention can be applied to virtual reality display devices, satisfying both the user's requirements for image resolution and viewing angle.

[0020] The present invention provides a virtual reality display device that can achieve the above-mentioned beneficial effects. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A top view of a second display screen of a display device provided in an embodiment of the present invention;

[0023] Figure 2 This is a longitudinal sectional view of a first region of a second display screen of a display device according to an embodiment of the present invention;

[0024] Figure 3 A longitudinal sectional view of the first region of the second display screen of a display device provided in another embodiment of the present invention;

[0025] Figure 4 This is a longitudinal sectional view of a second region of a second display screen of a display device according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a display device provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of a display device provided in another embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram showing the angular resolution of the central and peripheral areas of the display screen relative to the human eye.

[0029] Figure 8 The image is displayed by a display device according to an embodiment of the present invention.

[0030] The reference numerals in the accompanying drawings include:

[0031] 100 - Human eye, 101 - First display screen, 102 - Second display screen, 103 - First area, 104 - Second area, 105 - Semi-transparent and semi-reflective element, 106 - Preset optical element, 107 - Third area, 108 - Lens group;

[0032] 200-Reflective surface, 201-Liquid crystal layer, 202-Common electrode, 203-Pixel electrode, 204-Cover plate, 205-Backlight, 206-Color display element, 300-Display screen, 301-Central area, 302-Surrounding area. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0034] This embodiment provides a display device, including a first display screen, a second display screen, and preset optical elements, wherein the second display screen includes a first region and a second region;

[0035] The first display screen is used to emit a first image light, which passes through the preset optical element and enters the first area of ​​the second display screen. The first area of ​​the second display screen is used to reflect the first image light, and the second area of ​​the second display screen is used to emit a second image light, so that the first image light reflected from the first area and the second image light emitted from the second area combine to form the image light emitted by the display device.

[0036] The first image light reflected from the first region and the second image light emitted from the second region are emitted through the preset optical element, so that the first image light reflected from the first region and the second image light emitted from the second region are separated from the first image light from the first display screen.

[0037] The first image light emitted from the first display screen passes through a preset optical element and enters a first area of ​​the second display screen, where the first area of ​​the second display screen reflects the first image light. The second area of ​​the second display screen then emits a second image light. The first image light reflected from the first area of ​​the second display screen and the second image light emitted from the second area of ​​the second display screen combine to form the image light emitted by the display device. The first image light or the second image light refers to light carrying image information. When the first image light or the second image light enters the user's eyes, the user can view the corresponding image.

[0038] Therefore, the image presented by this display device is formed by combining the image displayed on the first display screen and the image displayed in the second area of ​​the second display screen. The image displayed on the first display screen is presented through the first area of ​​the second display screen, which corresponds to the area that the user's eyes focus on most when viewing. The image resolution of the image displayed on the first display screen can be relatively high, so that the image presented by this display device can meet the user's requirements for image resolution. Meanwhile, the size of the second area of ​​the second display screen can be relatively large, so that the viewing angle of the image presented by this display device can meet the requirements. Therefore, the display device of this embodiment can be applied to virtual reality display devices, satisfying both the user's requirements for image resolution and viewing angle.

[0039] For examples, please refer to Figure 1 , Figure 1The figure shows a top view of a second display screen of a display device according to one embodiment. The second display screen 102 includes a first region 103 and a second region 104. The first region 103 reflects first image light incident on it, and the second region 104 emits second image light. In some embodiments, the first region 103 of the second display screen 102 may include a liquid crystal layer, electrodes, and a reflective surface. The reflective surface and the liquid crystal layer are sequentially arranged along the light emission direction of the second display screen 102. The electrodes are connected to the liquid crystal layer and are used to energize the liquid crystal layer to control whether it is light-transmitting or light-blocking. The reflective surface is used to reflect the first image light incident on it when the liquid crystal layer is light-transmitting. When the liquid crystal layer is light-transmitting, the first image light from the first display screen 101 passes through the liquid crystal layer and is incident on the reflective surface. The first image light reflected by the reflective surface passes back through the liquid crystal layer and is emitted to a preset optical element. When the liquid crystal layer is light-blocking, the first image light from the first display screen 101 cannot be incident on the reflective surface, and the first region 103 of the second display screen 102 will not display an image. Therefore, by controlling whether the liquid crystal layer is transparent or not, the first area 103 of the second display screen 102 can be controlled to display an image.

[0040] Optionally, the liquid crystal layer may include multiple liquid crystal cells, each of which is connected to a corresponding electrode to independently control whether it is light-transmitting or light-blocking. The light transmission or light blocking of each liquid crystal cell can be independently controlled according to display requirements to control the display of images in the first area 103 of the second display screen 102. The liquid crystal cells of the liquid crystal layer may correspond to pixels of the liquid crystal layer. Accordingly, in some embodiments, the electrodes may include a common electrode and pixel electrodes. Each liquid crystal cell in the liquid crystal layer of the first area 103 is connected to the common electrode, and each liquid crystal cell is connected to its corresponding pixel electrode. Using a common electrode can reduce the complexity of arranging electrodes in the liquid crystal layer. See the example below. Figure 2 , Figure 2 The figure shows a longitudinal cross-sectional view of a first region of a second display screen 103 provided in one embodiment. The first region 103 includes a liquid crystal layer 201 and a reflective surface 200, which are sequentially arranged along the light emission direction of the second display screen 102. A common electrode 202 and pixel electrodes 203 are located on opposite sides of the liquid crystal layer 201 and are respectively connected to it. When the liquid crystal layer 201 transmits light, the light passing through it can be incident on the reflective surface 200 and reflected out. Optionally, a cover plate 204 is provided on the light emission side of the liquid crystal layer 201, which protects the liquid crystal layer 201 and the electrodes.

[0041] In some embodiments, a first region 103 of the second display screen 102 may include a reflective surface for reflecting the first image light incident upon it. See, for example, [reference needed]. Figure 3 , Figure 3 The figure shows a longitudinal cross-sectional view of a first region of a second display screen 103, as provided in another embodiment. The first region 103 includes a reflective surface 200, which may be disposed on one side surface of a cover plate 204. In this embodiment, no liquid crystal layer is disposed in the first region 103 of the second display screen 102, which can reduce the structural complexity of the second display screen 102. The cover plate 204 may be, but is not limited to, a transparent glass cover plate.

[0042] In the above embodiments, the reflective surface 200 may be, but is not limited to, a reflective film, which may be a reflective film formed of a material with high reflectivity.

[0043] In this embodiment, the type and structure of the second region 104 of the second display screen 102 are not limited. The second region 104 of the second display screen 102 can be, but is not limited to, a liquid crystal display screen, an OLED display screen, or an LED display screen. Optionally, in some embodiments, the second region 104 of the second display screen 102 may include a color display element, a liquid crystal layer, electrodes, and a backlight. The backlight, the liquid crystal layer, and the color display element are arranged sequentially along the light emission direction of the second display screen 102. The electrodes are connected to the liquid crystal layer and are used to energize the liquid crystal layer to control whether the liquid crystal layer is light-transmitting or light-blocking. The color display element is used to make the light emitted from the backlight source that passes through the liquid crystal layer form primary color light, so that the second region 104 emits the second image light. See the example below. Figure 4 , Figure 4 The figure shows a longitudinal cross-sectional view of a second region of a second display screen 104 provided in one embodiment. The second region 104 includes a backlight 205, a liquid crystal layer 201, and a color display element 206 arranged sequentially along the light emission direction of the second display screen 102. Electrodes, including a common electrode 202 and pixel electrodes 203, are located on opposite sides of the liquid crystal layer 201 and connected to it. Power is supplied to the liquid crystal layer 201 through the electrodes to control whether the liquid crystal layer 201 is light-transmitting or light-blocking. When the liquid crystal layer 201 is light-transmitting, the light emitted from the backlight 205 passes through the liquid crystal layer 201 and illuminates the color display element 206, which then emits light of the corresponding color.

[0044] In embodiments where the second display screen 102 employs a liquid crystal display screen, the first region 103 of the second display screen 102 may not have a color display element, and a reflective surface 200 may be provided. The backlight 205 located in the first region 103 can be retained, and the backlight 205 can be blocked by the reflective surface 200, thus blocking the light from passing through the backlight 205. For example, refer to... Figure 2 The reflective surface 200 shown is located on the light-emitting side of the backlight 205.

[0045] In this embodiment, the type and structure of the first display screen 101 are not limited. The first display screen 101 may be, but is not limited to, a silicon-based display screen, and may be, but is not limited to, a silicon-based OLED display screen, a silicon-based Micro OLED display screen, or a silicon-based MicroLED display screen. Using a silicon-based display screen can achieve higher image resolution.

[0046] In some embodiments, the preset optical element is a semi-transparent, semi-reflective element, which is used to reflect the first image light from the first display screen 101 to the first area 103 of the second display screen 102, and to transmit the first image light reflected from the first area 103 and the second image light emitted from the second area 104. See also the example. Figure 5 , Figure 5 This is a schematic diagram of a display device according to one embodiment. As shown, first image light from a first display screen 101 is incident on a transflective element 105 and reflected to a first region 103 of a second display screen 102. The first region 103 reflects the first image light back to the transflective element 105. Second image light emitted from a second region 104 is emitted to the transflective element 105. The first and second image light from the second display screen 102 are emitted after passing through the transflective element 105.

[0047] In this embodiment, the structure of the semi-transparent and semi-reflective element 105 is not limited. Optionally, the semi-transparent and semi-reflective element 105 may include a substrate and a semi-transparent and semi-reflective film disposed on the substrate.

[0048] In some embodiments, the preset optical element may include a third region and a fourth region; the first image light emitted from the first display screen 101 is incident on the third region of the preset optical element, reflected by the third region to the first region 103 of the second display screen 102, the first image light reflected from the first region 103 is transmitted through the third region of the preset optical element, and the second image light emitted from the second region 104 is transmitted through the fourth region of the preset optical element. See also, for example, [reference needed]. Figure 6 , Figure 6A schematic diagram of a display device according to another embodiment is shown in the figure. The preset optical element 106 includes a third region 107 and a fourth region. The region on the preset optical element 106 other than the third region 107 is the fourth region. First image light from the first display screen 101 is incident on the third region 107 of the preset optical element 106 and reflected to the first region 103 of the second display screen 102. The first region 103 reflects the first image light back to the third region 107 of the preset optical element 106 and transmits through the third region 107. Second image light emitted from the second region 104 transmits through the fourth region of the preset optical element 106. In this embodiment, the third region 107 of the preset optical element 106 can be configured as semi-transparent and semi-reflective, for example, a semi-transparent and semi-reflective film can be provided.

[0049] Preferably, the brightness of the first image light emitted from the first display screen 101 is greater than the brightness of the second image light emitted from the second region 104 of the second display screen 102. Since the first image light emitted from the first display screen 101 needs to pass through a preset optical element and be reflected by the first region 103, energy loss occurs during light propagation. Therefore, the brightness of the light emitted from the first display screen 101 is set to be greater than the brightness of the light emitted from the second region 104 of the second display screen 102 to ensure uniform brightness of the light emitted from the first region 103 and the second region 104 of the second display screen 102, resulting in uniform brightness of the image presented by the display device. For example, for... Figure 5 The display device shown can be configured to set the brightness of the light emitted from the first display screen 101 to twice the brightness of the light emitted from the second area 104 of the second display screen 102. For Figure 6 The display device shown can set the brightness of the light emitted from the first display screen 101 to be four times the brightness of the light emitted from the second area 104 of the second display screen 102.

[0050] The first image light emitted from the first display screen 101 and the second image light emitted from the second region 104 of the second display screen 102 combine to form the image light emitted by the display device. The image displayed on the first display screen 101 corresponds to the missing portion of the image displayed on the second display screen 102 in the first region 103. During operation, the refresh rate of the first display screen 101 is the same as that of the second display screen 102. Simultaneously, the first line of data for one frame of image is transmitted to both the first and second display screens, ensuring that the images are displayed synchronously and aligned. For example, the refresh rates of both the first and second display screens 101 and 102 can be 90Hz or 120Hz.

[0051] Based on relevant theories, please refer to Figure 7 , Figure 7This is a schematic diagram showing the angular resolution of the central and peripheral areas of a display screen relative to the human eye. The central area 301 and peripheral area 302 of the display screen 300 contain the same number of pixels per inch. Figure 7 As shown, if the human eye is directly facing the central area 301, the angular resolution relative to the peripheral area 302 is greater than that of the central area 301. For example, relative to the human eye, the angular resolution of the central area 301 of the display screen 300 is 9 pixels / deg, while the angular resolution of the peripheral area 302 is 27 pixels / deg. The human eye has a higher requirement for the image resolution of the central area 301 of the display screen 300 and a relatively lower requirement for the image resolution of the peripheral area 302. Based on this, in this display device, the image resolution of the image displayed on the first display screen 101 is greater than the image resolution of the image displayed in the second area 104 of the second display screen 102, and the first area 103 of the second display screen 102 is located in the central area of ​​the second display screen 102. For example, if the human eye-level resolution is 60 PPD (i.e., 60 pixels / deg), the first display screen 101 can be configured to display images with a higher resolution, while the second area 104 of the second display screen 102 can display images with a lower resolution. This allows the display device to achieve a 60 PPD human eye-level resolution display effect across the entire viewing angle, enhancing user immersion. The second display screen 102 can be larger to meet viewing angle requirements, such as a 110° viewing angle. See the example below. Figure 8 , Figure 8 In one embodiment, the image displayed by the display device has a higher image resolution in the central area than in the peripheral areas, resulting in a clearer and more detailed image in the central area.

[0052] Optional reference Figure 5 or Figure 6 The display device may further include a lens group 108 disposed on the side of the preset optical element away from the second display screen 102. The lens group 108 is used to converge the first image light and the second image light emitted from the preset optical element to the human eye 100, so that the human eye 100 can view a clear image. In this embodiment, the structure of the lens group 108 is not limited, and may include, but is not limited to, a Fresnel lens, an aspherical lens, or a spherical lens.

[0053] This display device combines a first display screen and a second display screen, employing a combination of high and low image resolutions. This satisfies both the user's requirements for image resolution and viewing angle, achieving the required image resolution across all viewing angles while maintaining a wide viewing angle, thus enhancing the user's immersive experience.

[0054] This embodiment also provides a virtual reality display device, including the display device described in any of the above embodiments.

[0055] In this embodiment, the virtual reality display device presents an image formed by combining an image displayed on a first display screen and an image displayed in a second area of ​​a second display screen. The image displayed on the first display screen is presented through a first area of ​​the second display screen, which corresponds to the area that the user's eyes focus on when viewing. The image resolution of the image displayed on the first display screen can be high, so that the image presented by this virtual reality display device can meet the user's requirements for the image resolution of the display screen. The size of the second area of ​​the second display screen can be large, so that the viewing angle of the image presented by this virtual reality display device can meet the requirements. Thus, it can meet the user's requirements for both the image resolution and the viewing angle.

[0056] The display device and virtual reality display equipment provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A display device, characterized in that, It includes a first display screen, a second display screen, and preset optical elements, wherein the second display screen includes a first region and a second region; The first display screen is used to emit a first image light, which passes through the preset optical element and is incident on the first area of ​​the second display screen. The first area of ​​the second display screen is used to reflect the first image light. The first area of ​​the second display screen includes a reflective surface, which is used to reflect the first image light incident on the reflective surface. The second area of ​​the second display screen is used to emit a second image light, such that the first image light reflected from the first area and the second image light emitted from the second area combine to form the image light emitted by the display device. The first image light reflected from the first region and the second image light emitted from the second region are emitted through the preset optical element, so that the first image light reflected from the first region and the second image light emitted from the second region are separated from the first image light from the first display screen.

2. The display device according to claim 1, characterized in that, The first area of ​​the second display screen includes a liquid crystal layer, an electrode, and a reflective surface. The reflective surface and the liquid crystal layer are arranged sequentially along the light emission direction of the second display screen. The electrode is connected to the liquid crystal layer and is used to supply power to the liquid crystal layer to control whether the liquid crystal layer is light-transmitting or not. The reflective surface is used to reflect the first image light incident on the reflective surface that passes through the liquid crystal layer when the liquid crystal layer is transparent.

3. The display device according to claim 2, characterized in that, The liquid crystal layer includes multiple liquid crystal cells, each of which is connected to a corresponding electrode to independently control whether each liquid crystal cell is light-transmitting or not.

4. The display device according to claim 1, characterized in that, The second area of ​​the second display screen includes a liquid crystal display screen, and the first display screen includes a silicon-based display screen.

5. The display device according to claim 1, characterized in that, The image resolution of the image displayed on the first display screen is greater than the image resolution of the image displayed in the second area of ​​the second display screen, and the first area of ​​the second display screen is located in the middle area of ​​the second display screen.

6. The display device according to claim 1, characterized in that, The brightness of the first image light emitted from the first display screen is greater than the brightness of the second image light emitted from the second area of ​​the second display screen.

7. The display device according to any one of claims 1-6, characterized in that, The preset optical element is a semi-transparent and semi-reflective element. The preset optical element is used to reflect the first image light from the first display screen to the first area of ​​the second display screen, and to transmit the first image light reflected from the first area and the second image light emitted from the second area.

8. The display device according to any one of claims 1-6, characterized in that, The preset optical element includes a third region and a fourth region. The first image light emitted from the first display screen is incident on the third region of the preset optical element and reflected by the third region to the first region of the second display screen. The first image light reflected from the first region passes through the third region of the preset optical element, and the second image light emitted from the second region passes through the fourth region of the preset optical element.

9. A virtual reality display device, characterized in that, Includes the display device according to any one of claims 1 to 8.

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