Near-eye display device

Abstract

The application discloses a near-eye display device and belongs to the technical field of display. The near-eye display device comprises a display screen, a first polarization converter, a second polarization converter, a reflective polarizer, a first liquid crystal dimming panel and a driving assembly. The cooperation of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel and the reflective polarizer can make the light be folded back for multiple times, so that the volume and weight of the near-eye display device are relatively small. The state of the first liquid crystal dimming panel is changed by the driving assembly. In a target time length, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, the first liquid crystal dimming panel can transmit the first circularly polarized light and basically will not reflect the first circularly polarized light; when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, the first liquid crystal dimming panel can reflect the first circularly polarized light and basically will not transmit the first circularly polarized light. In this way, the utilization rate of the light of the near-eye display device can be effectively improved, and the display effect of the near-eye display device is good.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a near-eye display device. Background Technology

[0002] With the rapid development of near-eye display technology, people are using near-eye display devices such as virtual reality (VR) devices and augmented reality (AR) devices more and more frequently.

[0003] Near-eye display devices typically include a display screen and a lens assembly located on the light-emitting side of the screen. By adjusting the light emitted from the display screen through the lens assembly, users wearing near-eye display devices can observe magnified virtual display content, thus achieving an immersive display experience.

[0004] However, current near-eye display devices are typically large in size and heavy in weight. Summary of the Invention

[0005] This application provides a near-eye display device. It solves the problem of poor display performance in existing near-eye display devices. The technical solution is as follows:

[0006] A near-eye display device is provided, comprising:

[0007] Display screen;

[0008] The first polarization converter is located on the light-emitting side of the display screen and is used to convert the light emitted from the display screen into first circularly polarized light.

[0009] The second polarization converter is located on the side of the first polarization converter away from the display screen, and is used to realize the mutual conversion between circularly polarized light and linearly polarized light;

[0010] A reflective polarizer is located on the side of the second polarization converter away from the display screen. It is used to reflect first linearly polarized light and transmit second linearly polarized light. The polarization direction of the first linearly polarized light is perpendicular to the polarization direction of the second linearly polarized light.

[0011] A first liquid crystal dimming panel is located between the first polarization converter and the second deflection converter, and is used to transmit the first circularly polarized light when the first liquid crystal dimming panel is in a first state, and to reflect the first circularly polarized light when the first liquid crystal dimming panel is in a second state.

[0012] The driving component is electrically connected to the first liquid crystal dimming panel and is used to first control the first liquid crystal dimming panel to be in the first state and then control the first liquid crystal dimming panel to be in the second state within a target duration.

[0013] Optionally, the first liquid crystal dimming panel includes: two first substrates disposed opposite to each other, and a first cholesteric liquid crystal layer located between the two first substrates, each of the first substrates having an electrode layer;

[0014] When a voltage difference is formed between the two electrode layers of the two first substrates, the first liquid crystal dimming panel is in the first state; when no voltage difference is formed between the two electrode layers of the two first substrates, the first liquid crystal dimming panel is in the second state.

[0015] Optionally, the driving component is electrically connected to the electrode layers in the two first substrates respectively;

[0016] The driving component is configured to: first apply electrical signals to the two electrode layers in the two first substrates within the target duration to make the first liquid crystal dimming panel in the first state, and then stop applying electrical signals to the two electrode layers in the two first substrates to make the first liquid crystal dimming panel in the second state.

[0017] Optionally, the near-eye display device further includes: a second liquid crystal dimming panel located between the first polarization converter and the first liquid crystal dimming panel, the second liquid crystal dimming panel including: two second substrates disposed opposite to each other, and a second cholesteric liquid crystal layer located between the two second substrates;

[0018] In this process, one of the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer is levorotatory and the other is dextrorotatory.

[0019] Optionally, the duration for which the driving component controls the first liquid crystal dimming panel to be in the first state is the same as the duration for which the driving component controls the first liquid crystal dimming panel to be in the second state.

[0020] Optionally, the driving component is used to periodically control the first liquid crystal dimming panel to be in the first state or in the second state, with the target duration as the period.

[0021] Optionally, the display screen is a liquid crystal display screen, and the first polarization converter is a quarter-wave plate;

[0022] Alternatively, the display screen may be an organic light-emitting diode (OLED) display, a miniature organic light-emitting diode (OLED) display, or a miniature light-emitting diode (LED) display, and the first polarization converter may be a circular polarizer.

[0023] Optionally, the second polarization converter is a quarter-wave plate.

[0024] Optionally, the near-eye display device further includes: a lens group, the lens group including at least one lens;

[0025] The lens in the lens group is located between the reflective polarizer and the second polarization converter;

[0026] And / or, the lens in the lens group is located between the second polarization converter and the first liquid crystal dimming panel;

[0027] And / or, the lens in the lens group is located between the first liquid crystal dimming panel and the display screen.

[0028] Optionally, when the lens in the lens group is located between the reflective polarizer and the second polarization converter, the second polarization converter is attached to the side of the lens closest to the display screen, and / or the reflective polarizer is attached to the side of the lens away from the display screen;

[0029] When the lens in the lens group is located between the second polarization converter and the first liquid crystal dimming panel, the second polarization converter is attached to the side of the lens that is away from the display screen.

[0030] The beneficial effects of the technical solutions provided in this application are:

[0031] A near-eye display device includes a display screen, a first polarization converter, a second polarization converter, a reflective polarizer, a first liquid crystal dimming panel, and a driving assembly. By utilizing the cooperation of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel, and the reflective polarizer, the near-eye display device with these optical components can reflect light multiple times, resulting in a smaller size and lighter weight. Furthermore, the driving assembly changes the state of the first liquid crystal dimming panel so that, within a target duration, the first liquid crystal dimming panel can first transmit first circularly polarized light emitted from the first polarization converter, and then reflect first circularly polarized light emitted from the second polarization converter and incident on the first liquid crystal dimming panel. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, it can transmit the first circularly polarized light normally and reflect it substantially without reflecting it; conversely, when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, it can reflect the first circularly polarized light normally and reflect it substantially without transmitting it. In this way, the light utilization rate of near-eye display devices can be effectively improved, ensuring that the display effect of near-eye display devices is better. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a near-eye display device.

[0034] Figure 2 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this application;

[0035] Figure 3 This is an optical path diagram of a near-eye display device provided in an embodiment of this application when the first liquid crystal dimming panel is in a first state;

[0036] Figure 4 This is an optical path diagram of a near-eye display device provided in an embodiment of this application when the first liquid crystal dimming panel is in a second state;

[0037] Figure 5 This is a schematic diagram of a first liquid crystal dimming panel structure provided in an embodiment of this application;

[0038] Figure 6 This application provides a schematic diagram of another near-eye display device structure.

[0039] Figure 7 This is a schematic diagram of a second liquid crystal dimming panel structure provided in an embodiment of this application;

[0040] Figure 8 This is a schematic diagram of another near-eye display device structure provided in this application embodiment. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0042] In related technologies, to reduce the size of near-eye display devices, optical components that allow light to be reflected multiple times can be incorporated within the device, ensuring the light enters the user's eye after these reflections. Compared to traditional near-eye display devices with lens groups, this type of device effectively shortens the light propagation path by utilizing multiple reflections, resulting in a smaller overall thickness and size while maintaining the same light-emitting area.

[0043] For example, please refer to Figure 1 , Figure 1This is a schematic diagram of a near-eye display device. The near-eye display device 00 may include: a display screen 01, a first polarization converter 02, a semi-reflective film 03, a second polarization converter 04, and a reflective polarizer 05.

[0044] The first polarization converter 02 in the near-eye display device 00 can be located on the light-emitting side of the display screen 01. The first polarization converter 02 is used to convert the light emitted from the display screen 01 into first circularly polarized light S1.

[0045] The second polarization converter 04 in the near-eye display device 00 is located on the side of the first polarization converter 02 away from the display screen 01. This second polarization converter 04 is used to realize the mutual conversion between circularly polarized light and linearly polarized light.

[0046] In the near-eye display device 00, a reflective polarizer 05 is located on the side of the second polarization converter 04 opposite to the display screen 01. This reflective polarizer 05 reflects first linearly polarized light L1 and transmits second linearly polarized light L2. Here, the polarization direction of the first linearly polarized light L1 is perpendicular to the polarization direction of the second linearly polarized light L2.

[0047] In the near-eye display device 00, a semi-reflective membrane 03 is located between the first polarization converter 02 and the second polarization converter 04. This semi-reflective membrane 03 transmits a portion of the first circularly polarized light S1 emitted from the first polarization converter 02 to the second polarization converter 04, and reflects a portion of the first circularly polarized light S1 emitted from the second polarization converter 04 back to the second polarization converter 04. Here, the polarization state of the first circularly polarized light S1 reflected by the semi-reflective membrane 03 changes; therefore, after being reflected by the semi-reflective membrane 03, the first circularly polarized light S1 is emitted as second circularly polarized light S2 towards the second polarization converter 04. One of the first circularly polarized light S1 and the second circularly polarized light S2 is left-handed circularly polarized light, and the other is right-handed circularly polarized light.

[0048] like Figure 1As shown, the light emitted from the display screen 01 is converted into first circularly polarized light S1 by the first polarization converter 02. After passing through the first polarization converter 02, the first circularly polarized light S1 can be directed towards the semi-reflective membrane 03. After passing through the semi-reflective membrane 03, a portion of the first circularly polarized light S1 can pass through the membrane, while the other portion is reflected. The portion of the first circularly polarized light S1 that passes through the semi-reflective membrane 03 is then converted into first linearly polarized light L1 by the second polarization converter 04. The first linearly polarized light L1 is transmitted through the second polarization converter 04 and can be directed towards the reflective polarizer 05, where it is reflected. The first linearly polarized light L1, after being reflected by the reflective polarizer 05, is then converted back into first circularly polarized light S1 by the second polarization converter 04. The first circularly polarized light S1, after being transmitted through the second polarization converter 04, can be directed again towards the semi-transparent membrane 03. After passing through the semi-transparent membrane 03, a portion of the first circularly polarized light S1 is reflected, while the remaining portion is transmitted through it. The portion of the first circularly polarized light S1 reflected by the semi-transparent membrane 03 can be converted into second circularly polarized light S2, which can then be directed again towards the second polarization converter 04. The second circularly polarized light S2, after passing through the second polarization converter 04, can be converted into second linearly polarized light L2. The second linearly polarized light L2, after being transmitted through the second polarization converter 04, can be directed towards the reflective polarizer 05, and can also be transmitted through the reflective polarizer 05 to enter the user's eye.

[0049] Although the near-eye display device utilizes the cooperation of a phase delay film (i.e., the first polarization converter 02 and the second polarization converter 04), a transflective film 03, and a reflective polarizer 05 to allow light to be reflected multiple times, resulting in a smaller size, a portion of the light emitted from the display screen 01 is unusable each time it passes through the transflective film 03. For example, when the first circularly polarized light S1 emitted from the first polarization converter 02 first passes through the transflective film 03, a portion of it is reflected, and this reflected light S1 can be converted into second circularly polarized light S2'. This second circularly polarized light S2' cannot reach the second polarization converter 04. For example, when the first circularly polarized light S1 emitted from the second polarization converter 04 passes through the semi-transparent and semi-reflective film 03 again, a portion of the first circularly polarized light S1, S1', is transmitted through the semi-transparent and semi-reflective film 03, and this portion of light S1' cannot reach the second polarization converter 04. Therefore, current near-eye display devices have low light utilization rates, resulting in poor display performance.

[0050] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this application. The near-eye display device 000 may include: a display screen 100, a first polarization converter 200, a second polarization converter 300, a reflective polarizer 400, a first liquid crystal dimming panel 500, and a driving assembly 600.

[0051] The first polarization converter 200 in the near-eye display device 000 is located on the light-emitting side of the display screen 100. The first polarization converter 200 is used to convert the light emitted from the display screen 100 into first circularly polarized light S1.

[0052] In the near-eye display device 000, the second polarization converter 300 is located on the side of the first polarization converter 200 facing away from the display screen 100. This second polarization converter 300 is used to convert between circularly polarized light and linearly polarized light. For example, after light passes through the second polarization converter 300, the phase of the light is delayed, enabling the second polarization converter 300 to convert between circularly polarized light and linearly polarized light. For instance, after circularly polarized light is incident on the second polarization converter 300, the phase of the circularly polarized light is delayed, allowing linearly polarized light to be transmitted through the second polarization converter 300; that is, circularly polarized light incident on the second polarization converter 300 can be converted into linearly polarized light by the second polarization converter 300. For example, after linearly polarized light is incident on the second polarization converter 300, the phase of the linearly polarized light after passing through the second polarization converter 300 will be delayed, so that circularly polarized light can be transmitted from the second polarization converter 300. That is, the linearly polarized light incident on the second polarization converter 300 can be converted into circularly polarized light by the second polarization converter 300.

[0053] In the near-eye display device 000, the reflective polarizer 400 is located on the side of the second polarization converter 300 opposite to the display screen 100. This reflective polarizer 400 reflects first linearly polarized light L1 and transmits second linearly polarized light L2. The polarization direction of the first linearly polarized light L1 is perpendicular to the polarization direction of the second linearly polarized light L2.

[0054] In the near-eye display device 000, a first liquid crystal dimming panel 500 is located between a first polarization converter 200 and a second polarization converter 300. This first liquid crystal dimming panel 500 transmits first circularly polarized light S1 when in a first state and reflects first circularly polarized light S1 when in a second state. Here, when the first circularly polarized light S1 is transmitted from the first liquid crystal dimming panel 500, its polarization state does not change; that is, after transmission from the first liquid crystal dimming panel 500, the first circularly polarized light S1 continues to be transmitted in the form of first circularly polarized light S1. When the first circularly polarized light S1 is reflected by the first liquid crystal dimming panel 500, its polarization state changes; that is, after reflection, the first circularly polarized light S1 continues to be transmitted in the form of second circularly polarized light S2.

[0055] The driving component 600 in the near-eye display device 000 is electrically connected to the first liquid crystal dimming panel 500. The driving component 600 is used to control the first liquid crystal dimming panel 500 to be in a first state and then to control the first liquid crystal dimming panel 500 to be in a second state within a target duration.

[0056] To more clearly illustrate the working principle of the near-eye display device 000, the following embodiments will explain the optical path during operation of the near-eye display device 000:

[0057] When the near-eye display device 000 is in operation, if the driving component 600 within the near-eye display device 000 controls the first liquid crystal dimming panel 500 to be in the first state within a target duration, then, please refer to... Figure 3 , Figure 3 This is an optical path diagram of a near-eye display device provided in an embodiment of this application when the first liquid crystal dimming panel is in a first state. Light emitted from the display screen 100 is converted into first circularly polarized light S1 by the first polarization converter 200. Since the first liquid crystal dimming panel 500 is in the first state, it can transmit the first circularly polarized light S1 emitted from the first polarization converter 200, and the polarization state of the first circularly polarized light S1 transmitted from the first liquid crystal dimming panel 500 does not change. Therefore, the first circularly polarized light S1 transmitted from the first liquid crystal dimming panel 500 can be directed towards the second polarization converter 300. After passing through the second polarization converter 300, the first circularly polarized light S1 can be converted into first linearly polarized light L1. The first linearly polarized light L1, after being transmitted from the second polarization converter 300, can be directed towards the reflective polarizer 400, and the first linearly polarized light L1 can be reflected by the reflective polarizer 400. The first linearly polarized light L1, after being reflected by the reflective polarizer 400, can be converted into the first circularly polarized light S1 by the second polarization converter 300.

[0058] If the driving component 600 within the near-eye display device 000 first controls the first liquid crystal dimming panel 500 to be in the first state within the target duration, and then controls the first liquid crystal dimming panel 500 to be in the second state, then please refer to... Figure 4 , Figure 4This is an optical path diagram of a near-eye display device provided in an embodiment of this application when the first liquid crystal dimming panel is in a second state. Since the first liquid crystal dimming panel 500 is in the second state, it can reflect the first circularly polarized light S1 emitted from the second polarization converter 200 and directed towards it. The polarization state of the first circularly polarized light S1 reflected by the first liquid crystal dimming panel 500 changes. Therefore, the first circularly polarized light S1 reflected by the first liquid crystal dimming panel 500 can be converted into second circularly polarized light S2 and then directed towards the second polarization converter 300. After passing through the second polarization converter 300, the second circularly polarized light S2 can be converted into second linearly polarized light L2. The second linearly polarized light L2, after being transmitted from the second polarization converter 300, can be directed towards the reflective polarizer 400 and can also be transmitted out from the reflective polarizer 400 to enter the user's eye.

[0059] In this embodiment, the near-eye display device 000 utilizes the cooperation of a first polarization converter 200, a second polarization converter 300, a first liquid crystal dimming panel 500, and a reflective polarizer 400 to enable the near-eye display device 000 with these optical components to refract light multiple times, resulting in a smaller size and weight. Furthermore, the driving component 600 changes the state of the first liquid crystal dimming panel 500 so that, within a target duration, the first liquid crystal dimming panel 500 first transmits the first circularly polarized light S1 emitted from the first polarization converter 200, and then reflects the first circularly polarized light S1 emitted from the second polarization converter 400 and directed towards the first liquid crystal dimming panel 500. Here, when the first liquid crystal dimming panel 500 is in the first state, the first circularly polarized light S1 emitted from the first polarization converter 200 can be transmitted through the first liquid crystal dimming panel 500. When the first liquid crystal dimming panel 500 is in the second state, the first circularly polarized light S1 emitted from the second polarization converter 300 and directed towards the first liquid crystal dimming panel 500 can be reflected by the first liquid crystal dimming panel 500. Therefore, by controlling the first liquid crystal dimming panel 500 to be in different states by the driving component 600, it can be ensured that when the first liquid crystal dimming panel 500 needs to transmit the first circularly polarized light S1, it can transmit the first circularly polarized light S1 normally and reflect it basically without reflecting it; and it can also be ensured that when the first liquid crystal dimming panel 500 needs to reflect the first circularly polarized light S1, it can reflect the first circularly polarized light S1 normally and reflect it basically without transmitting it. In this way, the light utilization rate of the near-eye display device 000 can be effectively improved, ensuring that the display effect of the near-eye display device 000 is good.

[0060] In summary, the near-eye display device provided in this application embodiment may include: a display screen, a first polarization converter, a second polarization converter, a reflective polarizer, a first liquid crystal dimming panel, and a driving component. By utilizing the cooperation of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel, and the reflective polarizer, the near-eye display device with these optical components can reflect light multiple times, resulting in a smaller size and lighter weight. Furthermore, by changing the state of the first liquid crystal dimming panel through the driving component, within a target duration, the first liquid crystal dimming panel can first transmit the first circularly polarized light emitted from the first polarization converter, and then reflect the first circularly polarized light emitted from the second polarization converter and incident on the first liquid crystal dimming panel. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, it can normally transmit the first circularly polarized light and substantially not reflect it; conversely, when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, it can normally reflect the first circularly polarized light and substantially not transmit it. In this way, the light utilization rate of near-eye display devices can be effectively improved, ensuring that the display effect of near-eye display devices is better.

[0061] In the embodiments of this application, please refer to Figure 5 , Figure 5 This is a schematic diagram of a first liquid crystal dimming panel structure provided in an embodiment of this application. The first liquid crystal dimming panel 500 includes: two first substrates 501 disposed opposite to each other, and a first cholesteric liquid crystal layer 502 located between the two first substrates 501. Each first substrate 501 has an electrode layer 5011. For example, each first substrate 501 may include: a first substrate 5012, and an electrode layer 5011 located on the side of the first substrate 5012 near the first cholesteric liquid crystal layer 502.

[0062] When a voltage difference is formed between the two electrode layers 5011 within the two first substrates 501, the first liquid crystal dimming panel 500 is in a first state; when no voltage difference is formed between the two electrode layers 5011 within the two first substrates 501, the first liquid crystal dimming panel 500 is in a second state.

[0063] In this case, the liquid crystal distributed within the first liquid crystal dimming panel 500 is a cholesteric liquid crystal. An important property of cholesteric liquid crystals is that when no electric field is applied to either side of the cholesteric liquid crystal, circularly polarized light of a certain rotation direction (e.g., left-handed circularly polarized light) incident on the cholesteric liquid crystal will be reflected back by the cholesteric liquid crystal, and the cholesteric liquid crystal can transmit right-handed circularly polarized light; however, when an electric field is applied to either side of the cholesteric liquid crystal, circularly polarized light of any rotation direction incident on the cholesteric liquid crystal can be transmitted through the cholesteric liquid crystal. Therefore, when a voltage difference is formed between the two electrode layers 5011 within the first liquid crystal dimming panel 500, an electric field is formed between them, and the first liquid crystal dimming panel 500 is in a first state. The first circularly polarized light S1 incident on the first liquid crystal dimming panel 500 can be transmitted through the first liquid crystal dimming panel 500. When no voltage difference is formed between the two electrode layers 5011 within the first liquid crystal dimming panel 500, no electric field is formed between them, and the first liquid crystal dimming panel 500 is in a second state. The first circularly polarized light S1 incident on the first liquid crystal dimming panel 500 can be reflected by the cholesteric liquid crystal distributed in the first cholesteric liquid crystal layer 502 within the first liquid crystal dimming panel 500.

[0064] Optionally, the driving component 600 can be electrically connected to two electrode layers 5011 in the two first substrates respectively. In this way, the driving component 600 can either directly apply an electrical signal to the electrode layers 5011 to create an electric field between the two electrode layers 5011, or stop applying an electrical signal to the electrode layers 5011 to prevent the formation of an electric field between the two electrode layers 5011. To this end, the driving component 600 is configured to: first apply an electrical signal to the electrode layers 5011 in the two first substrates within a target duration to put the first liquid crystal dimming panel 500 in a first state, and then stop applying an electrical signal to the electrode layers 5011 in the two first substrates to put the first liquid crystal dimming panel 500 in a second state.

[0065] Optionally, within the first liquid crystal light-transmitting panel 500, the electrode layers 5011 disposed in each first substrate 501 are all made of a transparent conductive material. This ensures that the electrode layers 5011 disposed in the first substrate 501 do not block light, and that light incident on the first liquid crystal light-transmitting panel 500 can pass normally through the electrode layers 5011 and be transmitted out. For example, the material of the electrode layers 5011 disposed in the first substrate 501 may include indium zinc oxide (IZO) or indium tin oxide (ITO).

[0066] In this application, the electrode layer 5011 disposed within the first substrate 501 can be a planar electrode disposed entirely within the same layer, or it can be an array of strip electrodes. Here, when the electrode layer 5011 disposed within the first substrate 501 is an array of strip electrodes, the extending directions of the two strip electrodes disposed within the first substrate 501 of the first liquid crystal light-transmitting panel 500 can be perpendicular. In this embodiment, the driving component 600 is used to periodically control the first liquid crystal dimming panel 500 to be in a first state or in a second state with a target duration as the period. For example, the target duration can be the duration for the display screen 100 to display one frame. In this way, by controlling the first liquid crystal dimming panel 500 to be in the first state and then controlling the first liquid crystal dimming panel 500 to be in the second state within the duration for which the display screen 100 displays one frame, the light emitted by the display screen 100 can be emitted from the reflective polarizer 300 and directed towards the user's eyes within the duration for which the display screen 100 displays one frame. Therefore, within the duration of displaying one frame on the screen 100, the user can see that frame, ensuring that the user can normally see the image displayed by the near-eye display device 000 after wearing it.

[0067] Optionally, the duration for which the driving component 600 controls the first liquid crystal dimming panel 500 to be in the first state is the same as the duration for which the driving component 600 controls the first liquid crystal dimming panel 500 to be in the second state. This ensures that the transmission time of the first polarized light S1 emitted from the first polarization converter 200 through the first liquid crystal dimming panel 500 is the same as the reflection time of the first polarized light S1 emitted from the second polarization converter 200 by the first liquid crystal dimming panel 500, thus ensuring better display performance of the near-eye display device 000.

[0068] Please refer to the following in this application: Figure 6 and Figure 7 , Figure 6 This application provides a schematic diagram of another near-eye display device structure. Figure 7 This is a schematic diagram of a second liquid crystal dimming panel structure provided in an embodiment of this application. The near-eye display device 000 further includes a second liquid crystal dimming panel 700 located between the first polarization converter 200 and the first liquid crystal dimming panel 500. The second liquid crystal dimming panel 700 includes two second substrates 701 disposed opposite to each other, and a second cholesteric liquid crystal layer 702 located between the two second substrates 701.

[0069] In this design, one of the first cholesteric liquid crystal layer 502 in the first liquid crystal dimming panel 500 and the second cholesteric liquid crystal layer 702 in the second liquid crystal dimming panel 700 is left-handed chiral, and the other is right-handed chiral. It should be noted that, except for the difference in chirality of the cholesteric liquid crystal layer, the structure of the second liquid crystal dimming panel 700 is the same as that of the first liquid crystal dimming panel 500. Therefore, the structure of the second liquid crystal dimming panel 700 can be referenced... Figure 5 The structure of the first liquid crystal dimming panel 500 shown is not described in detail here in the embodiments of this application.

[0070] In this case, if no electric field is formed in the first liquid crystal dimming panel 500, the first cholesteric liquid crystal layer 502 in the first liquid crystal dimming panel 500 reflects the first circularly polarized light S1 and transmits the second circularly polarized light S2. Then, if no electric field is formed in the second liquid crystal dimming panel 700, the second cholesteric liquid crystal layer 702 in the second liquid crystal dimming panel 700 can reflect the second circularly polarized light S2 and transmit the first circularly polarized light S1.

[0071] In this way, no electric field is formed in the second liquid crystal dimming panel 700 located between the first polarization converter 200 and the first liquid crystal dimming panel 500. This allows all the first circularly polarized light S1 transmitted from the first polarization converter 200 to pass through the second liquid crystal dimming panel 700. The first circularly polarized light S1 that passes through the second liquid crystal dimming panel 700 can then be directed normally towards the first liquid crystal dimming panel 500. Other light transmitted from the first polarization converter 200 will not pass through the second liquid crystal dimming panel 700. This ensures that all light directed towards the first liquid crystal dimming panel 500 is the first circularly polarized light S1, without any other interfering light, thereby further improving the display effect of the near-eye display device 000.

[0072] It should be noted that different chiral agents can be added to the first cholesteric liquid crystal layer 502 and the second cholesteric liquid crystal layer 502 to enable them to satisfy the aforementioned optical properties. For example, if the chirality of the first cholesteric liquid crystal layer 502 is levorotatory, a levorotatory chiral agent can be added to the first cholesteric liquid crystal layer 502 so that, in the absence of an electric field in the first liquid crystal dimming panel 500, the first cholesteric liquid crystal layer 502 can reflect levorotatory circularly polarized light and transmit dextral circularly polarized light. If the chirality of the second cholesteric liquid crystal layer 702 is dextral, a dextral chiral agent can be added to the second cholesteric liquid crystal layer 702 so that, in the absence of an electric field in the second liquid crystal dimming panel 700, the second cholesteric liquid crystal layer 702 can reflect dextral circularly polarized light and transmit levorotatory circularly polarized light.

[0073] Optionally, the display screen 100 within the near-eye display device 000 can be of various types, and the structure of the first polarization converter 200 disposed on the light-emitting side of different types of display screens 100 is also different. Therefore, this application will illustrate this with examples of the following two possible implementations:

[0074] In a first possible implementation, when the display screen 100 within the near-eye display device 000 is a liquid crystal display (LCD), since the light emitted from the LCD is linearly polarized, the first polarization converter 200 located on the light-emitting side of the LCD needs to convert the linearly polarized light into circularly polarized light. For this purpose, the first polarization converter 200 can be a quarter-wave plate.

[0075] In a second possible implementation, when the display screen 100 within the near-eye display device 000 is an organic light-emitting diode (OLED) display, a miniature OLED display, or a miniature OLED display, since the light emitted from these display screens 100 is all natural light, the first polarization converter 200 located on the light-emitting side of these display screens 100 needs to convert the natural light into circularly polarized light. For this purpose, the first polarization converter 200 can be a circular polarizer. The circular polarizer can include a linear polarizer and a quarter-wave plate stacked together, with the linear polarizer closer to the display screen 100 than the quarter-wave plate. In this way, the light emitted from the display screen 100 can first be converted into linearly polarized light by the linear polarizer in the circular polarizer, and then converted back into circularly polarized light by the quarter-wave plate in the circular polarizer.

[0076] Optionally, the second polarization converter 300 within the near-eye display device 000 can be a quarter-wave plate. A quarter-wave plate enables the conversion between circularly polarized light and linearly polarized light.

[0077] In the embodiments of this application, please refer to Figure 8 , Figure 8 This application provides another schematic diagram of a near-eye display device structure. The near-eye display device 000 further includes a lens group 800, which includes at least one lens. The lens in the lens group 800 is located between the reflective polarizer 400 and the second polarization converter 300. And / or, the lens in the lens group 800 is located between the second polarization converter 300 and the first liquid crystal dimming panel 500. And / or, the lens in the lens group 800 is located between the first liquid crystal dimming panel 500 and the display screen 100. By providing the lens group 800 within the near-eye display device 000, the light transmitted by the near-eye display device 000 can be adjusted to ensure a better display effect of the image observed by the user when wearing the near-eye display device 000.

[0078] Optionally, when the lens in the lens group 800 is located between the reflective polarizer 400 and the second polarization converter 300, the second polarization converter 300 is attached to the side of the lens closest to the display screen 100, and / or, the reflective polarizer 400 is attached to the side of the lens away from the display screen 100. When the lens in the lens group 800 is located between the second polarization converter 300 and the first liquid crystal dimming panel 500, the second polarization converter 300 is attached to the side of the lens away from the display screen 100. This further improves the compactness of the integrated optical components within the near-eye display device, thereby further reducing the size of the near-eye display device.

[0079] In summary, the near-eye display device provided in this application embodiment may include: a display screen, a first polarization converter, a second polarization converter, a reflective polarizer, a first liquid crystal dimming panel, and a driving component. By utilizing the cooperation of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel, and the reflective polarizer, the near-eye display device with these optical components can reflect light multiple times, resulting in a smaller size and lighter weight. Furthermore, by changing the state of the first liquid crystal dimming panel through the driving component, within a target duration, the first liquid crystal dimming panel can first transmit the first circularly polarized light emitted from the first polarization converter, and then reflect the first circularly polarized light emitted from the second polarization converter and incident on the first liquid crystal dimming panel. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, it can normally transmit the first circularly polarized light and substantially not reflect it; conversely, when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, it can normally reflect the first circularly polarized light and substantially not transmit it. In this way, the light utilization rate of near-eye display devices can be effectively improved, ensuring that the display effect of near-eye display devices is better.

[0080] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0081] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0082] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A near-eye display device, characterized in that, include: Display screen; The first polarization converter is located on the light-emitting side of the display screen and is used to convert the light emitted from the display screen into first circularly polarized light. The second polarization converter is located on the side of the first polarization converter away from the display screen, and is used to realize the mutual conversion between circularly polarized light and linearly polarized light; A reflective polarizer is located on the side of the second polarization converter away from the display screen. It is used to reflect first linearly polarized light and transmit second linearly polarized light. The polarization direction of the first linearly polarized light is perpendicular to the polarization direction of the second linearly polarized light. A first liquid crystal dimming panel is located between the first polarization converter and the second polarization converter, and is used to transmit the first circularly polarized light when the first liquid crystal dimming panel is in a first state, and to reflect the first circularly polarized light when the first liquid crystal dimming panel is in a second state. A driving component, electrically connected to the first liquid crystal dimming panel, is used to first control the first liquid crystal dimming panel to be in the first state and then control the first liquid crystal dimming panel to be in the second state within a target duration. The second liquid crystal dimming panel is located between the first polarization converter and the first liquid crystal dimming panel; The first liquid crystal dimming panel includes two first substrates and a first cholesteric liquid crystal layer located between the two first substrates. Each first substrate has an electrode layer made of a transparent conductive material. The first liquid crystal dimming panel is in the first state when a voltage difference is formed between the two electrode layers, and in the second state when no voltage difference is formed between the two electrode layers. The second liquid crystal dimming panel includes a second cholesteric liquid crystal layer, wherein one of the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer is left-handed and the other is right-handed. No electric field is ever formed within the second liquid crystal dimming panel. The electrode layer disposed within the first substrate is either a planar electrode disposed in a single layer or a strip electrode arranged in an array. When the electrode layer is an array of strip electrodes, the extending directions of the strip electrodes disposed in the two first substrates are perpendicular.

2. The near-eye display device according to claim 1, characterized in that, The driving components are electrically connected to the electrode layers in the two first substrates, respectively. The driving component is configured to: first apply electrical signals to the two electrode layers in the two first substrates within the target duration to make the first liquid crystal dimming panel in the first state, and then stop applying electrical signals to the two electrode layers in the two first substrates to make the first liquid crystal dimming panel in the second state.

3. The near-eye display device according to claim 1, characterized in that, The second liquid crystal dimming panel further includes: two second substrates disposed opposite to each other; the second cholesteric liquid crystal layer is located between the two second substrates.

4. The near-eye display device according to claim 1, characterized in that, The duration for which the driving component controls the first liquid crystal dimming panel to be in the first state is the same as the duration for which the driving component controls the first liquid crystal dimming panel to be in the second state.

5. The near-eye display device according to claim 1, characterized in that, The driving component is used to periodically control the first liquid crystal dimming panel to be in the first state or in the second state, with the target duration as the period.

6. The near-eye display device according to any one of claims 1 to 5, characterized in that, The display screen is a liquid crystal display screen, and the first polarization converter is a quarter-wave plate; Alternatively, the display screen may be an organic light-emitting diode (OLED) display, a miniature organic light-emitting diode (OLED) display, or a miniature light-emitting diode (LED) display, and the first polarization converter may be a circular polarizer.

7. The near-eye display device according to any one of claims 1 to 5, characterized in that, The second polarization converter is a quarter-wave plate.

8. The near-eye display device according to any one of claims 1 to 5, characterized in that, The near-eye display device further includes: a lens group, the lens group including at least one lens; The lens in the lens group is located between the reflective polarizer and the second polarization converter; And / or, the lens in the lens group is located between the second polarization converter and the first liquid crystal dimming panel; And / or, the lens in the lens group is located between the first liquid crystal dimming panel and the display screen.

9. The near-eye display device according to claim 8, characterized in that, When the lens in the lens group is located between the reflective polarizer and the second polarization converter, the second polarization converter is attached to the side of the lens that is close to the display screen, and / or the reflective polarizer is attached to the side of the lens that is away from the display screen; When the lens in the lens group is located between the second polarization converter and the first liquid crystal dimming panel, the second polarization converter is attached to the side of the lens that is away from the display screen.

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