CN115509010A - Near-to-eye display device - Google Patents

Abstract

The application discloses near-to-eye display equipment belongs to and shows technical field. A near-eye display device comprising: the 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 first polarization converter, the second polarization converter, the first liquid crystal dimming panel and the reflection polarizer are matched with each other, so that light can be turned back for multiple times, and the size and the weight of the near-to-eye display device are small. The state of the first liquid crystal dimming panel is changed through the driving assembly, the first liquid crystal dimming panel can transmit first circularly polarized light and basically cannot reflect the first circularly polarized light when the first liquid crystal dimming panel needs to transmit the first circularly polarized light within the target duration, and the first liquid crystal dimming panel can reflect the first circularly polarized light and basically cannot transmit the first circularly polarized light when the first liquid crystal dimming panel needs to reflect the first circularly polarized light. Therefore, the utilization rate of the near-eye display equipment to light rays can be effectively improved, and the good display effect of the near-eye display equipment is ensured.

Description

Near-to-eye display device

Technical Field

The application relates to the technical field of display, in particular to near-to-eye display equipment.

Background

With the rapid development of near-eye display technology, people have increasingly frequent use of near-eye display devices such as Virtual Reality (VR) devices and Augmented Reality (AR) devices.

Near-eye display devices typically include: the display screen to and be located the battery of lens of the light-emitting side of display screen. Adjust the light that the display screen sent through the lens group, can let the user who wears near-to-eye display device observe enlarged virtual display content to realize immersive demonstration experience.

However, the volume of current near-eye display devices is generally large, and the weight of the near-eye display devices is also large.

Disclosure of Invention

The embodiment of the application provides a near-eye display device. The problem of the display effect of near-to-eye display equipment of prior art is relatively poor can be solved, technical scheme as follows:

there is provided a near-eye display device comprising:

a display screen;

the first polarization converter is positioned on the light emitting side of the display screen and used for converting light emitted by the display screen into first circularly polarized light;

the second polarization converter is positioned on one side of the first polarization converter, which is far away from the display screen, and is used for realizing the mutual conversion between circularly polarized light and linearly polarized light;

the reflective polarizer is positioned on one side, away from the display screen, of the second polarization converter and used for reflecting the first linearly polarized light and transmitting the second linearly polarized light, and the polarization direction of the first linearly polarized light is perpendicular to that of the second linearly polarized light;

the first liquid crystal dimming panel is positioned between the first polarization converter and the second deflection converter and used for transmitting the first circularly polarized light when the first liquid crystal dimming panel is in a first state and reflecting the first circularly polarized light when the first liquid crystal dimming panel is in a second state;

and the driving component is electrically connected with the first liquid crystal dimming panel and is used for controlling the first liquid crystal dimming panel to be in the first state and then controlling the first liquid crystal dimming panel to be in the second state within a target time length.

Optionally, the first liquid crystal dimming panel includes: the liquid crystal display panel comprises two first substrates and a first cholesteric liquid crystal layer, wherein the two first substrates are oppositely arranged, the first cholesteric liquid crystal layer is positioned between the two first substrates, and each first substrate is provided with an electrode layer;

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.

Optionally, the driving components are electrically connected to the electrode layers in the two first substrates, respectively;

wherein the drive assembly is configured to: and in the target time length, firstly applying electric signals to the two electrode layers in the two first substrates to enable the first liquid crystal dimming panel to be in the first state, and then stopping applying the electric signals to the two electrode layers in the two first substrates to enable the first liquid crystal dimming panel to be in the second state.

Optionally, the near-eye display device further includes: a second liquid crystal dimming panel positioned between the first polarization converter and the first liquid crystal dimming panel, the second liquid crystal dimming panel comprising: the two second substrates are oppositely arranged, and the second cholesteric liquid crystal layer is positioned between the two second substrates;

wherein, the chirality of one of the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer is the left-handed chirality, and the chirality of the other one is the right-handed chirality.

Optionally, the time period for the driving component to control the first liquid crystal dimming panel to be in the first state is the same as the time period for the driving component to control the first liquid crystal dimming panel to be in the second state.

Optionally, the drive assembly is configured to: and periodically controlling the first liquid crystal dimming panel to be in the first state or the second state by taking the target duration as a period.

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

or, the display screen is an organic light emitting diode display, a micro organic light emitting diode display or a micro light emitting diode display, and the first polarization converter is a circular polarizer.

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

Optionally, the near-eye display device further includes: a lens group comprising at least one lens;

wherein a lens of the lens group is positioned between the reflective polarizer and the second polarization converter;

and/or lenses in the lens group are positioned between the second polarization converter and the first liquid crystal dimming panel;

and/or the lens in the lens group is positioned between the first liquid crystal dimming panel and the display screen.

Optionally, when a lens in the lens group is located between the reflective polarizer and the second polarization converter, the second polarization converter is attached to a surface of the lens close to the display screen, and/or the reflective polarizer is attached to a surface of the lens away from the display screen;

when the lens in the lens group is positioned between the second polarization converter and the first liquid crystal dimming panel, the second polarization converter is attached to one surface, deviating from the display screen, of the lens.

The technical scheme provided by the embodiment of the application has the following beneficial effects:

a near-eye display device comprising: the 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. By utilizing the mutual matching of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel and the reflective polarizer, the near-eye display equipment with the optical components can perform multiple times of turning back on light, so that the size of the near-eye display equipment is smaller, and the weight of the near-eye display equipment is also smaller. And the state of the first liquid crystal dimming panel is changed through the driving assembly, so that the first liquid crystal dimming panel can firstly 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 emitted to the first liquid crystal dimming panel within a target time length. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, the first liquid crystal dimming panel can normally transmit the first circularly polarized light and basically does not reflect the first circularly polarized light, and when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, the first liquid crystal dimming panel can normally reflect the first circularly polarized light and basically does not transmit the first circularly polarized light. Therefore, the utilization rate of the near-eye display equipment to light rays can be effectively improved, and the good display effect of the near-eye display equipment is ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a near-eye display device;

fig. 2 is a schematic structural diagram of a near-eye display device according to an embodiment of the present disclosure;

fig. 3 is an optical path diagram of a near-eye display device when a first liquid crystal dimming panel is in a first state according to an embodiment of the present application;

fig. 4 is an optical path diagram of a near-eye display device when a first liquid crystal dimming panel is in a second state according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a first liquid crystal dimming panel according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another near-eye display device according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a second liquid crystal dimming panel according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of another near-eye display device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the related art, in order to reduce the volume of the near-eye display apparatus, an optical component that enables light to be turned back a plurality of times may be provided in the near-eye display apparatus, and the light may enter the eyes of the user after being turned back a plurality of times. Compared with the traditional near-eye display equipment with the lens group, on the premise of reaching the same light-emitting area, the near-eye display equipment can effectively shorten the propagation path of light by utilizing multiple turn-back of the light, so that the whole thickness of the near-eye display equipment is smaller, and the whole volume is smaller.

For example, referring to fig. 1, fig. 1 is a schematic structural diagram of a near-eye display device. Near-eye display device 00 may include: the display panel comprises a display screen 01, a first polarization converter 02, a semi-reflecting and semi-transmitting film 03, a second polarization converter 04 and a reflective polarizer 05.

The first polarization converter 02 in the near-eye display device 00 may be located at the light exit side of the display screen 01. The first polarization converter 02 is used for converting light emitted from the display screen 01 into first circularly polarized light S1.

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

The reflective polarizer 05 in the near-eye display device 00 is located on the side of the second polarization converter 04 facing away from the display screen 01. The reflective polarizer 05 is used for reflecting the first linearly polarized light L1 and transmitting the second linearly polarized light L2. Here, the polarization direction of the first linearly polarized light L1 and the polarization direction of the second linearly polarized light L2 are perpendicular to each other.

The transflective film 03 in the near-eye display device 00 is located between the first polarization converter 02 and the second polarization converter 04. The transflective film 03 is used to transmit a part of the first circularly polarized light S1 emitted from the first polarization converter 02 to the second polarization converter 04, and reflect a part of the first circularly polarized light S1 emitted from the second polarization converter 04 to the second polarization converter 04 again. Here, the polarization state of the first circularly polarized light S1 reflected by the transflective film 03 changes, and therefore, the first circularly polarized light S1 is reflected by the transflective film 03 and then directed to the second polarization converter 04 in the form of the second circularly polarized light S2. 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.

As shown in fig. 1, after passing through the first polarization converter 02, the light emitted from the display screen 01 can be converted into first circularly polarized light S1 by the first polarization converter 02. The first circularly polarized light S1 can be transmitted to the transflective film 03 after being transmitted from the first polarization converter 02, and after the first circularly polarized light S1 passes through the transflective film 03, a part of the first circularly polarized light S1 can transmit through the transflective film 03, and another part of the first circularly polarized light S1 can be reflected by the transflective film 03. The part of the first circularly polarized light S1 transmitted through the transflective film 03 can be converted into the first linearly polarized light L1 by the second polarization converter 04 after passing through the second polarization converter 04. The first linearly polarized light L1 may be transmitted from the second polarization converter 04 and may be directed to the reflective polarizer 05, and the first linearly polarized light L1 may be reflected by the reflective polarizer 05. The first linearly polarized light L1 reflected by the reflective polarizer 05 may be converted into first circularly polarized light S1 by the second polarization converter 04 after passing through the second polarization converter 04. The first circularly polarized light S1 can be reflected to the reflective and semi-permeable film 03 again after being transmitted from the second polarization converter 04, and after the first circularly polarized light S1 passes through the semi-reflective and semi-permeable film 03, a part of the first circularly polarized light S1 is reflected by the semi-reflective and semi-permeable film 03, and another part of the first circularly polarized light S1 is transmitted from the semi-reflective and semi-permeable film 03. The part of the first circularly polarized light S1 reflected by the transflective film 03 may be converted into a second circularly polarized light S2, and may be directed to the second polarization converter 04 again. The second circularly polarized light S2 may be converted into the second linearly polarized light L2 by the second polarization converter 04 after passing through the second polarization converter 04. The second linearly polarized light L2 may be emitted to the reflective polarizer 05 after being transmitted from the second polarization converter 04, and the second linearly polarized light L2 may be transmitted out of the reflective polarizer 05 to enter the eye of the user.

Although the mutual cooperation of the phase retarder (i.e. the first polarization converter 02 and the second polarization converter 04), the transflective film 03 and the reflective polarizer 05 is utilized, the near-eye display device with these optical components can perform multiple turns of light, so that the near-eye display device is small in size. However, when the near-eye display device is operated, a part of light emitted from the display screen 01 cannot be utilized every time the light passes through the transflective film 03. For example, when the first circularly polarized light S1 emitted from the first polarization converter 02 passes through the transflective film 03 for the first time, a part of light rays of the first circularly polarized light S1 is reflected by the transflective film 03, and the first circularly polarized light S1 is reflected by the transflective film 03 and can be converted into the second circularly polarized light S2', and the part of the second circularly polarized light S2' cannot be emitted to the second polarization converter 04. For another example, when the first circularly polarized light S1 emitted from the second polarization converter 04 passes through the transflective film 03 again, a part of the light S1 'of the first circularly polarized light S1 is transmitted through the transflective film 03, and the part of the light S1' cannot be transmitted to the second polarization converter 04. Therefore, the utilization rate of light rays by the existing near-eye display equipment is low, and the display effect of the near-eye display equipment is poor.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a near-eye display device according to an embodiment of the present disclosure. Near-eye display device 000 may include: the liquid crystal display device comprises 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.

The first polarization transformer 200 in the near-eye display device 000 is located at the light exit side of the display screen 100. The first polarization converter 200 is used for converting light emitted from the display screen 100 into first circularly polarized light S1.

The second polarization converter 300 in the near-eye display device 000 is located on the side of the first polarization converter 200 facing away from the display screen 100. The second polarization converter 300 is for realizing mutual conversion between circularly polarized light and linearly polarized light. Illustratively, after the light passes through the second polarization converter 300, the phase of the light is delayed, so that the second polarization converter 300 can perform mutual conversion between circularly polarized light and linearly polarized light. For example, after the circularly polarized light is emitted to the second polarization converter 300, the phase of the circularly polarized light passing through the second polarization converter 300 is delayed, so that linearly polarized light can be transmitted from the second polarization converter 300, that is, the circularly polarized light emitted to the second polarization converter 300 can be converted into linearly polarized light by the second polarization converter 300. For another example, after the linearly polarized light enters the second polarization converter 300, the phase of the linearly polarized light passing through the second polarization converter 300 is delayed, so that the circularly polarized light can be transmitted from the second polarization converter 300, that is, the linearly polarized light entering the second polarization converter 300 can be converted into the circularly polarized light by the second polarization converter 300.

The reflective polarizer 400 in the near-eye display device 000 is located on the side of the second polarization converter 300 facing away from the display screen 100. The reflective polarizer 400 is used for reflecting the first linearly polarized light L1 and transmitting the 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.

The first liquid crystal dimming panel 500 in the near-eye display device 000 is located between the first polarization converter 200 and the second polarization converter 300. The first liquid crystal dimming panel 500 is configured to transmit the first circularly polarized light S1 when the first liquid crystal dimming panel 500 is in the first state, and reflect the first circularly polarized light S1 when the first liquid crystal dimming panel 500 is in the second state. Here, when the first circularly polarized light S1 is transmitted through the first liquid crystal dimming panel 500, the polarization state of the first circularly polarized light S1 does not change, that is, the first circularly polarized light S1 is still transmitted in the form of the first circularly polarized light S1 after being transmitted through the first liquid crystal dimming panel 500. When the first circularly polarized light S1 is reflected by the first liquid crystal dimming panel 500, the polarization state of the reflected first circularly polarized light S1 changes, that is, the first circularly polarized light S1 is reflected by the first liquid crystal dimming panel 500 and then continuously transmitted in the form of the second circularly polarized light S2.

The driving assembly 600 in the near-eye display device 000 is electrically connected to the first liquid crystal dimming panel 500. The driving assembly 600 is configured to control the first liquid crystal dimming panel 500 to be in the first state and then control the first liquid crystal dimming panel 500 to be in the second state within the target time period.

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

when the near-eye display device 000 is in the working state, if the driving component 600 in the near-eye display device 000 controls the first liquid crystal dimming panel 500 to be in the first state within the target duration, please refer to fig. 3, where fig. 3 is a light path diagram of the near-eye display device when the first liquid crystal dimming panel is in the first state according to an embodiment of the present disclosure. After passing through the first polarization converter 200, the light emitted from the display panel 100 can be converted into the first circularly polarized light S1 by the first polarization converter 200. Since the first liquid crystal dimming panel 500 is in the first state, the first liquid crystal dimming panel 500 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. For this, the first circularly polarized light S1 transmitted from the first liquid crystal dimming panel 500 may be directed to the second polarization converter 300. The first circularly polarized light S1 emitted to the second polarization converter 300 may be converted into the first linearly polarized light L1 by the second polarization converter 300 after passing through the second polarization converter 300. The first linearly polarized light L1 may be emitted to the reflective polarizer 400 after being transmitted from the second polarization converter 300, and the first linearly polarized light L1 may be reflected by the reflective polarizer 400. The first linearly polarized light L1 reflected by the reflective polarizer 400 may be changed into the first circularly polarized light S1 by the second polarization converter 300 after passing through the second polarization converter 300.

If the driving component 600 in the near-eye display device 000 controls the first liquid crystal dimming panel 500 to be in the first state before controlling the first liquid crystal dimming panel 500 to be in the second state within the target time period, please refer to fig. 4, where fig. 4 is a light path diagram of the near-eye display device when the first liquid crystal dimming panel is in the second state according to an embodiment of the present application. Since the first liquid crystal dimming panel 500 is in the second state, the first liquid crystal dimming panel 500 can reflect the first circularly polarized light S1 emitted from the second polarization converter 200 and emitted to the first liquid crystal dimming panel 500, and the polarization state of the first circularly polarized light S1 reflected by the first liquid crystal dimming panel 500 may be changed. For this reason, the first circularly polarized light S1 reflected by the first liquid crystal dimming panel 500 may be converted into the second circularly polarized light S2 and then directed to the second polarization converter 300. The second circularly polarized light S2 emitted to the second polarization converter 300 may be converted into a second linearly polarized light L2 by the second polarization converter 300 after passing through the second polarization converter 300, the second linearly polarized light L2 may be emitted to the reflective polarizer 400 after being transmitted from the second polarization converter 300, and the second linearly polarized light L2 may be transmitted from the reflective polarizer 400 to enter the eye of the user.

In the embodiment of the present application, the near-eye display device 000 utilizes the mutual cooperation of the first polarization converter 200, the second polarization converter 300, the first liquid crystal dimming panel 500 and the reflective polarizer 400, so that the near-eye display device 000 with these optical components can turn back light multiple times, the volume of the near-eye display device 000 is small, and the weight of the near-eye display device 000 is also small. In addition, the driving assembly 600 changes the state of the first lcd dimming panel 500, so that the first lcd dimming panel 500 can transmit the first circularly polarized light S1 emitted from the first polarization converter 200 and reflect the first circularly polarized light S1 emitted from the second polarization converter 400 and emitted to the first lcd dimming panel 500 within a target time period. Here, when the first liquid crystal dimming panel 500 is in the first state, substantially all of the first circularly polarized light S1 emitted from the first polarization converter 200 may be transmitted from the first liquid crystal dimming panel 500; when the first liquid crystal dimming panel 500 is in the second state, substantially all of the first circularly polarized light S1 emitted from the second polarization converter 300 and directed to the first liquid crystal dimming panel 500 may 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 assembly 600, when the first liquid crystal dimming panel 500 needs to transmit the first circularly polarized light S1, the first liquid crystal dimming panel can normally transmit the first circularly polarized light S1 without substantially reflecting the first circularly polarized light S1, and when the first liquid crystal dimming panel 500 needs to reflect the first circularly polarized light S1, the first liquid crystal dimming panel can normally reflect the first circularly polarized light S1 without substantially transmitting the first circularly polarized light S1. Therefore, the utilization rate of the near-eye display equipment 000 to light rays can be effectively improved, and the good display effect of the near-eye display equipment 000 is guaranteed.

In summary, the near-eye display device provided in the embodiment of the present application may include: the liquid crystal display comprises a display screen, a first polarization converter, a second polarization converter, a reflection polarizer, a first liquid crystal dimming panel and a driving component. By utilizing the mutual matching of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel and the reflective polarizer, the near-eye display equipment with the optical components can perform multiple times of turning back on light, so that the size of the near-eye display equipment is smaller, and the weight of the near-eye display equipment is also smaller. And the state of the first liquid crystal dimming panel is changed through the driving assembly, so that the first liquid crystal dimming panel can firstly 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 emitted to the first liquid crystal dimming panel within a target time length. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, the first liquid crystal dimming panel can normally transmit the first circularly polarized light and basically does not reflect the first circularly polarized light, and when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, the first liquid crystal dimming panel can normally reflect the first circularly polarized light and basically does not transmit the first circularly polarized light. Therefore, the utilization rate of the near-eye display equipment to light rays can be effectively improved, and the good display effect of the near-eye display equipment is ensured.

In the embodiment of the present application, please refer to fig. 5, and fig. 5 is a schematic structural diagram of a first liquid crystal dimming panel according to the embodiment of the present application. The first liquid crystal dimming panel 500 includes: two first substrates 501 arranged oppositely, and a first cholesteric liquid crystal layer 502 located between the two first substrates 501, each first substrate 501 having an electrode layer 5011. For example, each of the first substrates 501 may include: a first substrate 5012, and an electrode layer 5011 on a side of the first substrate 5012 near the first cholesteric liquid crystal layer 502.

When a voltage difference is formed between the two electrode layers 5011 in 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 in the two first substrates 501, the first liquid crystal dimming panel 500 is in the second state.

In this case, the distributed liquid crystal in the first liquid crystal dimming panel 500 is cholesteric liquid crystal. Cholesteric liquid crystals have one important property: when no electric field is applied to two sides of the cholesteric liquid crystal, circularly polarized light (for example, left circularly polarized light) in a certain rotation direction entering the cholesteric liquid crystal is reflected by the cholesteric liquid crystal, and the cholesteric liquid crystal can transmit the right circularly polarized light; however, when an electric field is applied to both sides of the cholesteric liquid crystal, any circularly polarized light 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 in the first liquid crystal dimming panel 500, an electric field may be formed therebetween, the first liquid crystal dimming panel 500 is in a first state, and the first circularly polarized light S1 emitted to the first liquid crystal dimming panel 500 may be transmitted through the first liquid crystal dimming panel 500; when no voltage difference is formed between the two electrode layers 5011 in the first liquid crystal dimming panel 500, no electric field is formed therebetween, the first liquid crystal dimming panel 500 is in the second state, and the first circularly polarized light S1 emitted to the first liquid crystal dimming panel 500 may be reflected by the cholesteric liquid crystal distributed in the first cholesteric liquid crystal layer 502 in the first liquid crystal dimming panel 500.

Alternatively, the driving assembly 600 may be electrically connected to the two electrode layers 5011 in the two first substrates, respectively. In this way, the driving assembly 600 can enable an electric field to be formed between the two electrode layers 5011 by directly applying an electric signal to the electrode layers 5011, or stop the application of an electric signal to the electrode layers 5011 so that an electric field is not formed between the two electrode layers 5011 any more. To this end, the drive assembly 600 is used to: for a target period of time, the electric signal is first applied to the electrode layers 5011 in the two first substrates to make the first liquid crystal dimming panel 500 in the first state, and then the application of the electric signal to the electrode layers 5011 in the two first substrates is stopped to make the first liquid crystal dimming panel 500 in the second state.

Alternatively, in the first liquid crystal light-transmitting panel 500, the electrode layer 5011 provided in each of the first substrates 501 is made of a transparent conductive material. Thus, the electrode layer 5011 arranged in the first substrate 501 can be ensured not to block light, and light emitted to the first liquid crystal light-transmitting panel 500 can be emitted through the electrode layer 5011 normally. For example, the material of the electrode layer 5011 provided in the first substrate 501 may include: indium Zinc Oxide (IZO) or Indium Tin Oxide (ITO).

In this application, the electrode layer 5011 disposed in the first substrate 501 may be a planar electrode disposed in a whole layer, or may be a strip electrode arranged in an array. Here, when the electrode layers 5011 provided in the first substrates 501 are strip electrodes arranged in an array, the extending directions of the strip electrodes provided in the two first substrates 501 of the first liquid crystal light-transmitting panel 500 may be perpendicular. In the embodiment of the present application, the driving assembly 600 is used for: the first liquid crystal dimming panel 500 is controlled to be in the first state or the second state periodically with the target duration as a period. For example, the target duration may be a duration in which the display screen 100 displays one frame of picture. In this way, the driving assembly 600 controls the first liquid crystal dimming panel 500 to be in the first state and then controls the first liquid crystal dimming panel 500 to be in the second state in the time period when the display screen 100 displays a frame of picture, so that the light emitted by the display screen 100 can be emitted from the reflective polarizer 300 to be emitted to the eyes of the user in the time period when the display screen 100 displays a frame of picture. For this reason, the user can view one frame of picture within a time period in which the display screen 100 displays the frame of picture, so as to ensure that the user can see the picture displayed by the near-eye display device 000 in normal light after wearing the near-eye display device 000.

Optionally, the driving assembly 600 controls a duration of the first liquid crystal dimming panel 500 in the first state to be the same as a duration of the driving assembly 600 controlling the first liquid crystal dimming panel 500 in the second state. In this way, the transmission time period of the first polarized light S1 emitted from the first polarization converter 200 through the first liquid crystal dimming panel 500 can be ensured to be the same as the reflection time period of the first polarized light S1 emitted from the second polarization converter 200 by the first liquid crystal dimming panel 500, so as to ensure that the near-eye display device 000 has a better display effect.

In the present application, please refer to fig. 6 and fig. 7, wherein fig. 6 is a schematic structural diagram of another near-eye display device provided in the embodiment of the present application, and fig. 7 is a schematic structural diagram of a second liquid crystal dimming panel provided in the embodiment of the present application. Near-eye display device 000 further includes: and a second liquid crystal dimming panel 700 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 between the two second substrates 701.

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 has a left-handed chirality, and the other has a right-handed chirality. The second liquid crystal dimming panel 700 has the same structure as the first liquid crystal dimming panel 500 except that the cholesteric liquid crystal layer has a different chirality. For this reason, the structure of the second liquid crystal dimming panel 700 may refer to the structure of the first liquid crystal dimming panel 500 shown in fig. 5, and the description of the embodiment of the present application is omitted here.

In this case, if 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 when no electric field is formed in the first liquid crystal dimming panel 500, the second cholesteric liquid crystal layer 702 in the second liquid crystal dimming panel 700 may reflect the second circularly polarized light S2 and transmit the first circularly polarized light S1 when no electric field is formed in the second liquid crystal dimming panel 700.

In this way, no electric field may be formed in the second liquid crystal dimming panel 700 located between the first polarization converter 200 and the first liquid crystal dimming panel 500 all the time, so that all the first circularly polarized light S1 transmitted from the first polarization converter 200 may pass through the second liquid crystal dimming panel 700, and the first circularly polarized light S1 passing through the second liquid crystal dimming panel 700 may be emitted to the first liquid crystal dimming panel 500 normally, and other light rays transmitted from the first polarization converter 200 may not pass through the second liquid crystal dimming panel 700, thereby ensuring that all the light rays emitted to the first liquid crystal dimming panel 500 are the first circularly polarized light S1, and no other interfering light rays are present, so as to further improve the display effect of the near-eye display device 000.

It should be noted that the optical properties of the first cholesteric liquid crystal layer 502 and the second cholesteric liquid crystal layer 502 can be satisfied by adding different chiral agents in the first cholesteric liquid crystal layer 502 and the second cholesteric liquid crystal layer 502. For example, if the chirality of the first cholesteric liquid crystal layer 502 is a left-handed chirality, a left-handed chirality agent may be added into the first cholesteric liquid crystal layer 502, so that the first cholesteric liquid crystal layer 502 can reflect left-handed circularly polarized light and transmit right-handed circularly polarized light without an electric field being formed in the first liquid crystal dimming panel 500. If the chirality of the second cholesteric liquid crystal layer 702 is right-handed chirality, a right-handed chirality agent may be added into the second cholesteric liquid crystal layer 702, so that the second cholesteric liquid crystal layer 702 can reflect right-handed circularly polarized light and transmit left-handed circularly polarized light without forming an electric field in the second liquid crystal dimming panel 700.

Alternatively, there are a plurality of types of display screens 100 in the near-eye display device 000, and the structures of the first polarization converters 200 disposed on the light exit sides of the different types of display screens 100 are also different. To this end, the present application will exemplify the following two possible implementations:

in a first possible implementation manner, when the display screen 100 in the near-to-eye display device 000 is a liquid crystal display screen, since light emitted from the liquid crystal display screen is linearly polarized light, the first polarization converter 200 disposed on the light emitting side of the liquid crystal display screen needs to convert the linearly polarized light into circularly polarized light. For this, the first polarization converter 200 may be a quarter wave plate.

In a second possible implementation manner, when the display screen 100 in the near-eye display device 000 is an organic light emitting diode display, a micro organic light emitting diode display, or a micro light emitting diode display, since the light rays emitted by the display screen 100 all belong to natural light, the first polarization converter 200 disposed on the light emitting side of the display screen 100 needs to convert the natural light into circularly polarized light. For this, the first polarization converter 200 may be a circular polarizer. Wherein, the circular polarizer may include: the linear polarizer and the quarter-wave plate are arranged in a stack, with the linear polarizer being closer to the display panel 100 than the quarter-wave plate. Thus, the light emitted from the display panel 100 may be converted into linearly polarized light by the linear polarizer in the circular polarizer, and then converted into circularly polarized light by the quarter-wave plate in the circular polarizer.

Alternatively, the second polarization converter 300 within the near-eye display device 000 may be a quarter-wave plate. The conversion between circularly polarized light and linearly polarized light can be realized through the quarter-wave plate.

In the embodiment of the present application, please refer to fig. 8, where fig. 8 is a schematic structural diagram of another near-eye display device provided in the embodiment of the present application, and the near-eye display device 000 further includes: lens group 800, lens group 800 comprising at least one lens. The lenses in the lens assembly 800 are located between the reflective polarizer 400 and the second polarization converter 300. And/or, the lenses in the lens group 800 are located between the second polarization converter 300 and the first liquid crystal dimming panel 500. And/or, the lenses in the 800 lens group are located between the first liquid crystal dimming panel 500 and the display screen 100. By arranging the lens group 800 in the near-eye display device 000, light transmitted by the near-eye display device 000 can be adjusted, so that a good display effect of a picture observed by a user when wearing the near-eye display device 000 is ensured.

Optionally, when the lens in the lens assembly 800 is located between the reflective polarizer 400 and the second polarization converter 300, the second polarization converter 300 is attached to a surface of the lens close to the display screen 100, and/or the reflective polarizer 400 is attached to a surface of the lens away from the display screen 100. When the lens in the lens set 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 a surface of the lens facing away from the display screen 100. In this way, the degree of compactness of the optical components integrated within the near-eye display device may be further improved to further reduce the volume of the near-eye display device.

In summary, the near-eye display device provided in the embodiment of the present application may include: the liquid crystal display comprises a display screen, a first polarization converter, a second polarization converter, a reflection polarizer, a first liquid crystal dimming panel and a driving component. By utilizing the mutual matching of the first polarization converter, the second polarization converter, the first liquid crystal dimming panel and the reflective polarizer, the near-eye display equipment with the optical components can turn back light for multiple times, so that the near-eye display equipment is small in size and light in weight. And the state of the first liquid crystal dimming panel is changed through the driving assembly, so that the first liquid crystal dimming panel can firstly 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 emitted to the first liquid crystal dimming panel within a target time length. Therefore, when the first liquid crystal dimming panel needs to transmit the first circularly polarized light, the first liquid crystal dimming panel can normally transmit the first circularly polarized light and basically does not reflect the first circularly polarized light, and when the first liquid crystal dimming panel needs to reflect the first circularly polarized light, the first liquid crystal dimming panel can normally reflect the first circularly polarized light and basically does not transmit the first circularly polarized light. Therefore, the utilization rate of the near-eye display equipment to light rays can be effectively improved, and the good display effect of the near-eye display equipment is ensured.

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be 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 layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended only to illustrate the alternative embodiments of the present application, and should not be construed as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A near-eye display device, comprising:

a display screen;

the first polarization converter is positioned on the light emergent side of the display screen and used for converting light rays emitted by the display screen into first circularly polarized light;

the second polarization converter is positioned on one side of the first polarization converter, which is far away from the display screen, and is used for realizing the mutual conversion between circularly polarized light and linearly polarized light;

the reflective polarizer is positioned on one side of the second polarization converter, which is far away from the display screen, and is used for reflecting the first linearly polarized light and transmitting the second linearly polarized light, and the polarization direction of the first linearly polarized light is vertical to that of the second linearly polarized light;

the first liquid crystal dimming panel is positioned between the first polarization converter and the second deflection converter and used for transmitting the first circularly polarized light when the first liquid crystal dimming panel is in a first state and reflecting the first circularly polarized light when the first liquid crystal dimming panel is in a second state;

and the driving component is electrically connected with the first liquid crystal dimming panel and is used for controlling the first liquid crystal dimming panel to be in the first state and then controlling the first liquid crystal dimming panel to be in the second state within a target time length.

2. The near-eye display device of claim 1, wherein the first liquid crystal dimming panel comprises: the liquid crystal display panel comprises two first substrates and a first cholesteric liquid crystal layer, wherein the two first substrates are oppositely arranged, the first cholesteric liquid crystal layer is positioned between the two first substrates, and each first substrate is provided with an electrode layer;

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.

3. The near-eye display device of claim 2, wherein the driving components are electrically connected to electrode layers in the two first substrates, respectively;

wherein the drive assembly is configured to: and in the target time length, firstly applying electric signals to the two electrode layers in the two first substrates to enable the first liquid crystal dimming panel to be in the first state, and then stopping applying the electric signals to the two electrode layers in the two first substrates to enable the first liquid crystal dimming panel to be in the second state.

4. The near-eye display device of claim 2, further comprising: a second liquid crystal dimming panel positioned between the first polarization converter and the first liquid crystal dimming panel, the second liquid crystal dimming panel comprising: the two second substrates are oppositely arranged, and the second cholesteric liquid crystal layer is positioned between the two second substrates;

wherein, the chirality of one of the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer is the left-handed chirality, and the chirality of the other one is the right-handed chirality.

5. The near-eye display device of claim 1, wherein the driving component controls a duration of time that the first liquid crystal dimming panel is in the first state to be the same as a duration of time that the driving component controls the first liquid crystal dimming panel to be in the second state.

6. The near-eye display device of claim 1, wherein the drive assembly is to: and periodically controlling the first liquid crystal dimming panel to be in the first state or the second state by taking the target duration as a period.

7. A near-eye display device as claimed in any one of claims 1 to 6 wherein the display screen is a liquid crystal display screen and the first polarization converter is a quarter-wave plate;

or, the display screen is an organic light emitting diode display, a micro organic light emitting diode display or a micro light emitting diode display, and the first polarization converter is a circular polarizer.

8. A near-eye display device as claimed in any one of claims 1 to 6 wherein the second polarization converter is a quarter-wave plate.

9. The near-eye display device of any one of claims 1-6, further comprising: a lens group comprising at least one lens;

wherein a lens of the lens group is positioned between the reflective polarizer and the second polarization converter;

and/or lenses in the lens group are positioned between the second polarization converter and the first liquid crystal dimming panel;

and/or lenses in the lens group are positioned between the first liquid crystal dimming panel and the display screen.

10. A near-eye display device according to claim 9, wherein when a lens of the lens group is positioned between the reflective polarizer and the second polarization converter, the second polarization converter is attached to a side of the lens close to the display screen, and/or the reflective polarizer is attached to a side of the lens away from the display screen;

when the lens in the lens group is positioned between the second polarization converter and the first liquid crystal dimming panel, the second polarization converter is attached to one surface, deviating from the display screen, of the lens.

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