Display system and control method thereof, head-mounted display device

Abstract

This invention discloses a display system and its control method, as well as a head-mounted display device, relating to the field of enhanced display technology. The display system includes a display component, a first polarization component, a light-rotating component, and a second polarization component. The display component emits first linearly polarized light. The first polarization component is disposed on the light-emitting side of the display component and reflects the first linearly polarized light while transmitting second linearly polarized light. The light-rotating component is disposed on the reflected light path of the first polarization component and receives and transmits the first linearly polarized light, rotating the polarization direction of the first linearly polarized light to convert it into third linearly polarized light. The second polarization component reflects the third linearly polarized light, enabling the light-rotating component to receive and transmit the third linearly polarized light, rotating the polarization direction of the third linearly polarized light to convert it into second linearly polarized light. The second linearly polarized light can pass through the first polarization component and be transmitted to the human eye. The technical solution of this invention can improve the optical efficiency of the display system.

Description

Technical Field

[0001] This invention relates to the field of head-mounted display technology, and particularly to a display system and its control method, and a head-mounted display device. Background Technology

[0002] In head-mounted display devices, the Birdbath optical solution typically employs a beam splitter to separate the light emitted by the display component. When the light reaches the beam splitter, a portion is reflected to a quarter-wave plate for polarization control, while the remaining portion is transmitted through the beam splitter. This process results in significant energy loss, leading to low optical efficiency of the display system. Summary of the Invention

[0003] The main objective of this invention is to provide a display system that aims to improve the optical efficiency of the display system.

[0004] To achieve the above objectives, the present invention provides a display system comprising:

[0005] Display component, used to emit first linearly polarized light;

[0006] A first polarization component is disposed on the light-emitting side of the display component, for receiving and reflecting the first linearly polarized light and transmitting the second linearly polarized light, wherein the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other.

[0007] An optical rotation component, disposed on the reflected light path of the first polarization component, is used to receive and transmit the first linearly polarized light, and to rotate the polarization direction of the first linearly polarized light to convert the first linearly polarized light into third linearly polarized light; and

[0008] The second polarization component is disposed on the side of the optical rotation component opposite to the first polarization component, and is used to reflect the third linearly polarized light;

[0009] The optical rotation component receives and transmits the third linearly polarized light, and rotates the polarization direction of the third linearly polarized light to convert the third linearly polarized light into the second linearly polarized light. The second linearly polarized light can be transmitted through the first polarization component and transmitted to the human eye.

[0010] In one embodiment, the second polarization component is disposed in the optical path from the external environment to the optical rotation component, for selectively transmitting fourth linearly polarized light whose polarization direction is perpendicular to the third linearly polarized light, and the optical rotation component has an energized state for rotating the polarization direction of the linearly polarized light and an de-energized state for maintaining the polarization direction.

[0011] When the optical rotation component is in the energized state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component and the optical rotation component to be converted into the first linearly polarized light and then blocked by the first polarization component from being transmitted to the human eye.

[0012] When the optical rotation component is in the power-off state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component, the optical rotation component, and the first polarization component, and then transmitted to the human eye.

[0013] In one embodiment, the optical rotation angle of the optical rotation component is 45°.

[0014] In one embodiment, the first polarizing component is arranged in a planar manner, and the plane in which the first polarizing component is located is inclined to the light emission direction of the display component;

[0015] And / or, the second polarizing component is arranged with a concave arc surface on the side facing the optical rotating component.

[0016] In one embodiment, the display component includes:

[0017] A light source, used to emit natural light; and

[0018] A polarizing element is disposed on the light-emitting side of the light source for receiving and selectively transmitting the first linearly polarized light in the natural light.

[0019] In one embodiment, the display system further includes:

[0020] The control component is electrically connected to the display component and / or the optical rotation component; and

[0021] A photosensitive component is electrically connected to the control component. The photosensitive component is used to detect the brightness of the external ambient light so that the control component adjusts the working state of the display component and / or the light-rotating component according to the brightness of the external ambient light.

[0022] The present invention also proposes a control method based on the display system described above, comprising the following steps:

[0023] Obtain the brightness of the external ambient light;

[0024] The operating state of the light-rotating component is controlled according to the brightness of the external ambient light, and the operating state includes a powered-on state and a powered-off state.

[0025] In one embodiment, the step of controlling the operating state of the optical rotating component based on the brightness of the external ambient light includes:

[0026] When the brightness of the external ambient light is within a preset brightness threshold range, the light-rotating component is controlled to maintain the power-off state.

[0027] When the brightness of the external ambient light is greater than a preset brightness threshold range, the light-rotating component is controlled to maintain the energized state.

[0028] In one embodiment, the step of controlling the operating state of the optical rotating component based on the brightness of the external ambient light includes:

[0029] The optical rotation component is controlled to periodically switch between the energized and de-energized states;

[0030] When the brightness of the external ambient light is within a preset brightness threshold range, the proportion of the time during which the light-rotating component is in the energized state in the cycle time is D1.

[0031] When the brightness of the external ambient light is greater than the preset brightness threshold range, the proportion of the time that the optical rotating component is in the energized state in the period time is D2, which satisfies D2 > D1.

[0032] In one embodiment, the switching frequency of the optical rotation component is greater than 25 Hz.

[0033] In one embodiment, the step of controlling the operating state of the optical rotation component based on the brightness of the external ambient light may, at the same time or after, further include:

[0034] The display brightness of the display component is controlled according to the brightness of the external ambient light, wherein the display brightness changes in the same trend as the brightness of the external ambient light.

[0035] The present invention also proposes a head-mounted display device, comprising the display system described in any one of the foregoing claims, wherein the display system includes:

[0036] Display component, used to emit first linearly polarized light;

[0037] A first polarization component is disposed on the light-emitting side of the display component, for receiving and reflecting the first linearly polarized light and transmitting the second linearly polarized light, wherein the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other.

[0038] An optical rotation component, disposed on the reflected light path of the first polarization component, is used to receive and transmit the first linearly polarized light, and to rotate the polarization direction of the first linearly polarized light to convert the first linearly polarized light into third linearly polarized light; and

[0039] The second polarization component is disposed on the side of the optical rotation component opposite to the first polarization component, and is used to reflect the third linearly polarized light;

[0040] The optical rotation component receives and transmits the third linearly polarized light, and rotates the polarization direction of the third linearly polarized light to convert the third linearly polarized light into the second linearly polarized light. The second linearly polarized light can be transmitted through the first polarization component and transmitted to the human eye.

[0041] The display system of the present invention includes a display component, a first polarization component, a light-rotating component, and a second polarization component. The polarization direction of the first linearly polarized light emitted from the display component is the same as the reflected polarization direction of the first polarization component. Therefore, the first linearly polarized light can be completely reflected by the first polarization component to the light-rotating component. The light-rotating component then rotates the polarization direction of the first linearly polarized light to obtain a third linearly polarized light with the same reflected polarization direction as the second polarization component. Subsequently, the third linearly polarized light can be completely reflected by the second polarization component to the light-rotating component. The light-rotating component then rotates the polarization direction of the third linearly polarized light to obtain a second linearly polarized light perpendicular to the reflected polarization direction of the first polarization component. This allows the second linearly polarized light to pass through the first polarization component and be transmitted to the human eye.

[0042] Since the linearly polarized light emitted from the display component is set to be parallel and perpendicular to the reflected polarization direction of the first polarization component when it passes through the first polarization component, the light intensity of the light emitted from the display component will theoretically not be lost when it passes through the first polarization component. This allows the light to be emitted from the display system without loss, thus improving the optical efficiency of the display system. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a structure of an embodiment of the display system provided by the present invention;

[0045] Figure 2 for Figure 1 The display shows the optical path diagram of the external ambient light when the system is powered on.

[0046] Figure 3 for Figure 1 The display shows the optical path diagram of the external ambient light when the system is in a power-off state.

[0047] Figure 4 A flowchart of the first embodiment of the control method for the display system provided by the present invention;

[0048] Figure 5 A flowchart of a second embodiment of the control method for the display system provided by the present invention;

[0049] Figure 6 A flowchart of the third embodiment of the control method for the display system provided by the present invention;

[0050] Figure 7 This is a flowchart of the fourth embodiment of the control method for the display system provided by the present invention.

[0051] Explanation of icon numbers:

[0052] 100. Display system; 10. Display component; 20. First polarization component; 30. Optical rotation component; 40. Second polarization component.

[0053] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0056] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0057] In head-mounted display devices, the Birdbath optical solution typically employs a beam splitter to separate the light emitted by the display component. When the light reaches the beam splitter, a portion is reflected to a quarter-wave plate for polarization control, while the remaining portion is transmitted through the beam splitter. This process results in significant energy loss, leading to low optical efficiency of the display system.

[0058] This invention proposes a display system 100. Please refer to [link / reference needed]. Figures 1 to 3 In one embodiment of the present invention, the display system 100 includes:

[0059] Display component 10 is used to emit first linearly polarized light;

[0060] The first polarization component 20 is disposed on the light-emitting side of the display component 10, and is used to receive and reflect the first linearly polarized light and transmit the second linearly polarized light. The polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other.

[0061] An optical rotation component 30, disposed on the reflected light path of the first polarization component 20, is used to receive and transmit the first linearly polarized light, and to rotate the polarization direction of the first linearly polarized light to convert the first linearly polarized light into third linearly polarized light; and

[0062] The second polarizing component 40 is disposed on the side of the optical rotating component 30 opposite to the first polarizing component 20, and is used to reflect the third linearly polarized light;

[0063] The optical rotation component 30 receives and transmits the third linearly polarized light, and rotates the polarization direction of the third linearly polarized light to convert the third linearly polarized light into the second linearly polarized light. The second linearly polarized light can be transmitted through the first polarization component 20 and transmitted to the human eye.

[0064] In this embodiment, the first polarization component 20 and the second polarization component 40 can be configured as reflective polarization elements, such as reflective polarizing films. A reflective polarization element has a polarization axis. When the polarization direction of linearly polarized light is parallel to the polarization axis, it can be selectively reflected by the reflective polarization element; when the polarization direction of linearly polarized light is perpendicular to the polarization axis, it can be selectively transmitted by the reflective polarization element. Furthermore, theoretically, there is no loss of light intensity during this process.

[0065] Specifically, in this embodiment, the polarization axis of the first polarization component 20 is parallel to the first linearly polarized light to achieve lossless reflection of the first linearly polarized light, allowing the first linearly polarized light to be transmitted toward the optical rotation component 30. Furthermore, the optical rotation component 30 is light-transmitting and can rotate the light transmitted through it, changing the polarization direction of the linearly polarized light. This configuration allows the first linearly polarized light transmitted through the optical rotation component 30 to be converted into third linearly polarized light. Since the polarization axis of the second polarization component 40 is parallel to the third linearly polarized light, lossless reflection of the third linearly polarized light can be achieved through the second polarization component 40.

[0066] Furthermore, the third linearly polarized light, after being reflected without damage by the second polarization component 40, can be transmitted into the optical rotation component 30. Under the optical rotation action of the optical rotation component 30, the polarization direction of the third linearly polarized light is changed, so as to obtain the second linearly polarized light whose polarization direction is perpendicular to the polarization axis of the first polarization component 20. Thus, the second linearly polarized light can be transmitted without damage through the first polarization component 20, so that the second linearly polarized light can be transmitted toward the human eye, and the human eye can obtain the display image emitted by the display component 10.

[0067] It is understood that the technical solution of the present invention achieves polarization control of linearly polarized light through the optical rotation component 30, so that the light emitted from the display component 10 is sequentially first linearly polarized light, third linearly polarized light, and second linearly polarized light during transmission. Since the linearly polarized light emitted from the display component 10 becomes first linearly polarized light and second linearly polarized light respectively when passing through the first polarization component 20, that is, the polarization direction of the light passing through the first polarization component 20 can be set parallel and perpendicular to the reflection polarization direction of the first polarization component 20, the light intensity of the light emitted from the display component 10 will theoretically not be lost during the process of passing through the first polarization component 20, thereby enabling the light to be emitted from the display system 100 without loss, improving the optical efficiency of the display system 100.

[0068] Please see Figure 2 and Figure 3 In an embodiment of the present invention, the second polarization component 40 is disposed in the optical path from the external environment to the optical rotation component 30, for selectively transmitting fourth linearly polarized light whose polarization direction is perpendicular to the third linearly polarized light, and the optical rotation component 30 has an energized state for rotating the polarization direction of the linearly polarized light and an de-energized state for maintaining the polarization direction.

[0069] When the optical rotation component 30 is in the energized state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component 40 and the optical rotation component 30 to be converted into the first linearly polarized light and then blocked by the first polarization component 20 from being transmitted to the human eye.

[0070] When the optical rotation component 30 is in the power-off state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component 40, the optical rotation component 30 and the first polarization component 20, and then transmitted to the human eye.

[0071] When the optical rotation component 30 is energized, the optical path of the external ambient light is as follows: Figure 2 As shown. When natural light from the external environment enters the second polarization component 40, the second polarization component 40 can selectively transmit the fourth linearly polarized light, during which half of the light energy of the natural light is lost. Furthermore, the fourth linearly polarized light can pass through the optical rotation component 30 to propagate towards the first polarization component 20. When the fourth linearly polarized light passes through the optical rotation component 30, under the optical rotation action of the optical rotation component 30, the polarization direction of the fourth linearly polarized light changes, converting it into first linearly polarized light with a polarization direction parallel to the polarization axis of the first polarization component 20. Thus, this portion of light can be completely reflected by the first polarization component 20, preventing it from passing through the first polarization component 20 and reaching the human eye.

[0072] Understandably, when the light-rotating component 30 is powered on, on the one hand, it can efficiently transmit the light emitted by the display component 10 to the human eye, and on the other hand, it can effectively block external ambient light inside the display system 100, thereby preventing external ambient light from interfering with the display screen of the display component 10. At this time, the display system 100 can normally realize the VR viewing function and is conducive to improving the contrast of the display screen.

[0073] When the optical rotation component 30 is in a de-energized state, the optical path of the external ambient light is as follows: Figure 3 As shown, when ambient light enters the second polarization component 40, the second polarization component 40 can selectively transmit fourth linearly polarized light, during which half of the light energy of the ambient light is lost. Furthermore, the fourth linearly polarized light can pass through the optical rotation component 30 to propagate towards the first polarization component 20. Since the optical rotation component 30 is in a de-energized state to maintain the polarization direction, the polarization direction of the fourth linearly polarized light does not change after passing through the optical rotation component 30. At this time, the first polarization component 20 can receive the fourth linearly polarized light from the ambient light.

[0074] Since the polarization direction of the fourth linearly polarized light is neither perpendicular to nor parallel to the polarization axis of the first polarization component 20, according to Malus's law, the fourth linearly polarized light can penetrate the first polarization component 20, and in this process, half of the light energy will be lost. By allowing the fourth linearly polarized light to pass through the first polarization component 20 and be transmitted towards the human eye, the human eye can obtain an image of the external environment, and at this time, the display system 100 can normally realize the optical see-through function.

[0075] It should be noted that when the rotating light component 30 is in a power-off state, the display component 10 can emit light normally, so that the display light of the display component 10 and the external ambient light can enter the human eye at the same time, thereby superimposing the display image and the external environment image to achieve virtual-real fusion.

[0076] During this process, since the light-rotating component 30 no longer controls the polarization of the light, the displayed light cannot achieve lossless transmission within the display system 100. Therefore, the light energy efficiency of the display system 100 can be the same as the theoretical efficiency of the Birdbath optical scheme, which is 25%. At this time, the display component 10 can provide higher brightness output to compensate for the light loss during the transmission of the displayed light, ensuring the display effect when the display system 100 achieves virtual-real fusion.

[0077] Optionally, in an embodiment of the present invention, the optical rotation angle of the optical rotation component 30 is 45°. Specifically, in this embodiment, the optical rotation angle of the optical rotation component 30 can be fixed at 45° by applying an external electric field to the optical rotation component 30 and fixing the applied voltage value to a preset value.

[0078] Of course, the technical solution of the present invention is not limited to this. The rotation angle of the optical rotation component 30 can also be set to other angles such as 135° as required, which is not limited here.

[0079] Please see Figure 1 In an embodiment of the present invention, the first polarizing component 20 is planar, and the plane on which the first polarizing component 20 is located is inclined to the light emission direction of the display component 10. With this configuration, the first linearly polarized light emitted from the display component 10, after being reflected by the first polarizing component 20, can be deflected out of the area where the display component 10 is located, so that the reflected light can be sequentially transmitted to the light-rotating component 30 and the second polarizing component 40.

[0080] Please see Figure 1 In an embodiment of the present invention, the second polarizing component 40 is arranged with a concave arc surface on the side facing the optical rotating component 30. This arrangement can achieve a magnification effect on the display image of the display component 10, which is beneficial to ensuring the display effect of the display system 100.

[0081] Specifically, in this embodiment, the second polarization component 40 may include a curved mirror disposed on the side of the optical rotation component 30 away from the first polarization component 20. The side of the curved mirror facing the optical rotation component 30 has a concave arc surface, and a reflective polarization film is provided on the concave arc surface to achieve selective reflection of the third linearly polarized light through the reflective polarization film.

[0082] Furthermore, the curved mirror can be configured to be light-transmitting, so that ambient light can be transmitted sequentially through the curved mirror and the reflective polarizing film, allowing the fourth polarized light in the ambient light to enter the display system 100 and be transmitted to the light-rotating component 30 for polarization control.

[0083] In an embodiment of the present invention, the display component 10 includes:

[0084] A light source, used to emit natural light; and

[0085] A polarizing element is disposed on the light-emitting side of the light source for receiving and selectively transmitting the first linearly polarized light in the natural light.

[0086] In this embodiment, the light source can be any one of the following light-emitting devices: LED light-emitting chip, LED lamp bead, or LED light strip. The light source emits light towards the first polarization component 20, and the emitted light can be natural light. To enable the natural light emitted by the light source to be converted into first linearly polarized light, a polarization element can be provided on the light-emitting side of the light source. This polarization element can be configured as a reflective polarization element. With this configuration, the first linearly polarized light in the natural light can be selectively transmitted through the reflective polarization element, so that the first linearly polarized light can be transmitted to the first polarization component 20 and completely reflected by the first polarization component 20 to the light-rotating component 30.

[0087] With this configuration, the polarization direction of the light emitted from the light source after passing through the polarization element can be set parallel to the reflection polarization direction of the first polarization component 20. This ensures that the light intensity of the light emitted from the display component 10 will not be lost when it is reflected by the first polarization component 20, thereby improving the optical efficiency of the display system 100.

[0088] In an embodiment of the present invention, the display system 100 further includes:

[0089] The control unit is electrically connected to the display unit 10 and / or the light-rotating unit 30; and

[0090] A photosensitive component is electrically connected to the control component. The photosensitive component is used to detect the brightness of the external ambient light so that the control component adjusts the working state of the display component 10 and / or the light-rotating component 30 according to the brightness of the external ambient light.

[0091] In one embodiment, the control unit can be electrically connected to both the photosensitive unit and the display unit 10 to control the brightness of the display unit 10 to increase accordingly when the ambient light intensity increases. In another embodiment, the control unit can also be electrically connected to both the photosensitive unit and the light-rotating unit 30 to control the light-rotating unit 30 to remain energized or to increase the proportion of time the light-rotating unit 30 is energized when the ambient light intensity increases. This configuration ensures the display effect of the display system 100 in strong light environments.

[0092] Of course, the technical solution of the present invention is not limited to this. In some embodiments, the control component can be electrically connected to the photosensitive component, the display component 10, and the light-rotating component 30 simultaneously. With this configuration, the control component can independently control the working state of either the display component 10 or the light-rotating component 30 according to the brightness of the external ambient light. Of course, the control component can also coordinately control the working states of the display component 10 and the light-rotating component 30 according to the brightness of the external ambient light, so as to further ensure the display effect of the display system 100.

[0093] The present invention also proposes a control method for a display system 100. The specific structure of the display system 100 is as described in the above embodiments. Since the control method of the display system 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0094] Please see Figure 4 In an embodiment of the present invention, the control method of the display system 100 includes the following steps:

[0095] S10, Obtain the brightness of the external ambient light;

[0096] S20. Control the working state of the light-rotating component 30 according to the brightness of the external ambient light. The working state includes a power-on state and a power-off state.

[0097] Specifically, when the light-rotating component 30 is powered on, the display system 100 can normally realize the VR viewing function; when the light-rotating component 30 is powered off, the display system 100 can realize the optical see-through function. By controlling the working state of the light-rotating component 30 based on the brightness of the external ambient light, the environmental see-through requirements of the display system 100 under different ambient light conditions can be met, thereby improving the user experience.

[0098] Please see Figure 5 In one embodiment of the present invention, the step of controlling the working state of the optical rotation component 30 according to the brightness of the external ambient light includes:

[0099] S21. When the brightness of the external ambient light is within a preset brightness threshold range, control the light-rotating component 30 to maintain the power-off state.

[0100] S22. When the brightness of the external ambient light is greater than the preset brightness threshold range, the light-rotating component 30 is controlled to maintain the energized state.

[0101] By controlling the light-rotating component 30 to remain powered on when the brightness of the external ambient light exceeds a preset brightness threshold range, the transmission of ambient light to the human eye can be blocked in strong light environments, so as to avoid strong light in the ambient light interfering with the display screen of the display component 10 and affecting the user's viewing of the display content of the display component 10.

[0102] Please see Figure 6 In another embodiment of the present invention, the step of controlling the working state of the optical rotation component 30 according to the brightness of the external ambient light includes:

[0103] S23. Control the optical rotation component 30 to periodically switch between the power-on state and the power-off state.

[0104] It should be noted that by applying an external electric field to the optical rotating component 30, the optical rotating component 30 can rotate light; by stopping the application of the external electric field, the optical rotating component 30 can maintain the polarization direction of the transmitted light. Therefore, the technical solution of the present invention can control the optical rotating component 30 to periodically switch between energized and de-energized states by applying a high-frequency pulse width modulated electric field to the optical rotating component 30.

[0105] Specifically, by applying a pulse width modulated electric field to the optical rotation component 30, the applied voltage can be periodically switched between low and high levels. When the applied voltage is low, the output voltage is 0V, and the optical rotation component 30 is in a de-energized state. When the applied voltage is high, the output voltage is a preset value, and the optical rotation component 30 is in a energized state, so that the optical rotation angle of the optical rotation component 30 is fixed at the preset value.

[0106] S24. When the brightness of the external ambient light is within a preset brightness threshold range, the proportion of the time during which the light-rotating component 30 is in the energized state in the periodic time is D1.

[0107] S25. When the brightness of the external ambient light is greater than the preset brightness threshold range, the proportion of the time that the light-rotating component 30 is in the energized state in the periodic time is D2, which satisfies D2 > D1.

[0108] By adjusting the duty cycle of the applied pulse width modulation voltage, the proportion of time the light-rotating component 30 is energized within the cycle time can be controlled. The higher the proportion of time the light-rotating component 30 is energized within the cycle time, the less interference from external ambient light in the display system 100. This setting allows for dynamic adjustment of the operating state of the light-rotating component 30, balancing the transmittance of external light in the display system 100 with the brightness and transparency of the displayed content, ensuring a good visual experience for users under different ambient light conditions.

[0109] Optionally, in embodiments of the present invention, the switching frequency of the light-rotating component 30 is greater than 25Hz. As some examples, the switching frequency of the light-rotating component 30 between the powered-on and powered-off states can be specifically set to 30Hz, 35Hz, 40Hz, etc. By controlling the switching frequency range of the light-rotating component 30, the persistence of vision mechanism of the human eye can be utilized, allowing the human eye to simultaneously and clearly see the display screen of the display component 10 and the external environment, ensuring the virtual-real fusion effect of the display system 100.

[0110] Please see Figure 7 In embodiments of the present invention, the step of controlling the operating state of the optical rotation component 30 according to the brightness of the external ambient light may be performed simultaneously or after the following:

[0111] S30. Control the display brightness of the display component 10 according to the brightness of the external ambient light, wherein the display brightness has the same trend as the brightness of the external ambient light.

[0112] By controlling the display brightness to match the brightness of the external ambient light, the display brightness of the display component 10 can be synchronously enhanced or weakened with the brightness of the external ambient light. This enables dynamic adjustment of the display brightness, allowing the display brightness provided by the display component 10 to adapt to the current environment. This effectively controls the energy consumption of the display system 100 while ensuring the display effect of the display system 100, thereby improving the battery life of the display system 100.

[0113] In one embodiment of the present invention, the step of controlling the display brightness of the display component 10 according to the brightness of the external ambient light includes:

[0114] When the brightness of the external ambient light is within a preset brightness threshold range, the display component 10 is controlled to operate at a first display brightness.

[0115] When the brightness of the external ambient light is greater than a preset brightness threshold range, the display component 10 is controlled to operate at a second display brightness, satisfying that the second display brightness is greater than the first display brightness.

[0116] Of course, the technical solution of the present invention is not limited to this. In some embodiments, the display system 100 may have two or more brightness threshold ranges arranged in ascending order, and the display component 10 may also have two or more display brightness values ​​arranged in ascending order, so that different display brightness values ​​of the display component 10 are matched with different brightness threshold ranges, thereby improving the flexibility of dynamic adjustment of display brightness.

[0117] The present invention also proposes a head-mounted display device, which includes a display system 100. The specific structure of the display system 100 is as described in the above embodiments. Since the head-mounted display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0118] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A display system, characterized by, include: Display component, used to emit first linearly polarized light; A first polarization component is disposed on the light-emitting side of the display component, for receiving and reflecting the first linearly polarized light and transmitting the second linearly polarized light, wherein the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other. An optical rotation component is disposed on the reflected light path of the first polarization component, for receiving and transmitting the first linearly polarized light, and rotating the polarization direction of the first linearly polarized light to convert the first linearly polarized light into a third linearly polarized light; as well as The second polarization component is disposed on the side of the optical rotation component opposite to the first polarization component, and is used to reflect the third linearly polarized light; The optical rotation component receives and transmits the third linearly polarized light, and rotates the polarization direction of the third linearly polarized light to convert the third linearly polarized light into the second linearly polarized light. The second linearly polarized light can be transmitted through the first polarization component and transmitted to the human eye.

2. The display system of claim 1, wherein, The second polarization component is disposed in the optical path from the external environment to the optical rotation component, and is used to selectively transmit fourth linearly polarized light whose polarization direction is perpendicular to the third linearly polarized light. The optical rotation component has an energized state for rotating the polarization direction of the linearly polarized light and an de-energized state for maintaining the polarization direction. When the optical rotation component is in the energized state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component and the optical rotation component to be converted into the first linearly polarized light and then blocked by the first polarization component from being transmitted to the human eye. When the optical rotation component is in the power-off state, the fourth linearly polarized light in the external ambient light is transmitted sequentially through the second polarization component, the optical rotation component, and the first polarization component, and then transmitted to the human eye.

3. The display system as described in claim 2, characterized in that, The optical rotation angle of the optical rotation component is 45°.

4. The display system as described in any one of claims 1 to 3, characterized in that, The first polarizing component is arranged in a plane, and the plane in which the first polarizing component is located is inclined to the light emission direction of the display component; And / or, the second polarizing component is arranged with a concave arc surface on the side facing the optical rotating component.

5. The display system as described in any one of claims 1 to 3, characterized in that, The display component includes: A light source, used to emit natural light; and A polarizing element is disposed on the light-emitting side of the light source for receiving and selectively transmitting the first linearly polarized light in the natural light.

6. The display system as described in any one of claims 1 to 3, characterized in that, The display system also includes: The control component is electrically connected to the display component and / or the optical rotation component; and A photosensitive component is electrically connected to the control component. The photosensitive component is used to detect the brightness of the external ambient light so that the control component adjusts the working state of the display component and / or the light-rotating component according to the brightness of the external ambient light.

7. A control method for a display system as described in any one of claims 1 to 6, characterized in that, The display system further includes a photosensitive component, and the control method includes the following steps: Obtain the brightness of the external ambient light; The operating state of the light-rotating component is controlled according to the brightness of the external ambient light, and the operating state includes a powered-on state and a powered-off state.

8. The control method for the display system as described in claim 7, characterized in that, The step of controlling the working state of the optical rotating component according to the brightness of the external ambient light includes: When the brightness of the external ambient light is within a preset brightness threshold range, the light-rotating component is controlled to maintain the power-off state. When the brightness of the external ambient light is greater than a preset brightness threshold range, the light-rotating component is controlled to maintain the energized state.

9. The control method for the display system as described in claim 7, characterized in that, The step of controlling the working state of the optical rotating component according to the brightness of the external ambient light includes: The optical rotation component is controlled to periodically switch between the energized and de-energized states; When the brightness of the external ambient light is within a preset brightness threshold range, the proportion of the time during which the light-rotating component is in the energized state in the cycle time is D1. When the brightness of the external ambient light is greater than the preset brightness threshold range, the proportion of the time that the optical rotating component is in the energized state in the period time is D2, which satisfies D2 > D1.

10. The control method for the display system as described in claim 9, characterized in that, The switching frequency of the optical rotation component is greater than 25Hz.

11. The control method for the display system as described in claim 7, characterized in that, The step of controlling the working state of the optical rotating component based on the brightness of the external ambient light may, at the same time or after, include: The display brightness of the display component is controlled according to the brightness of the external ambient light, wherein the display brightness changes in the same trend as the brightness of the external ambient light.

12. A head-mounted display device, characterized in that, Includes the display system as described in any one of claims 1 to 6.

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