CN113870782A

CN113870782A - Display module, head-up display system and display method

Info

Publication number: CN113870782A
Application number: CN202111109510.9A
Authority: CN
Inventors: 顾跃凤; 姬生超
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Wuhu Tianma Automotive Electronics Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2021-12-31
Anticipated expiration: 2041-09-22
Also published as: CN113870782B

Abstract

The application discloses a display module, a head-up display system and a display method. This display module assembly includes: the control system is connected with the image source system and the optical correction system and used for outputting control signals to the image source system and the optical correction system; the image source system is used for emitting N linear polarization state display light beams in different N time intervals according to the control signal, wherein N is a positive integer greater than 2; the optical correction system is positioned on the propagation paths of the N linear polarization state display light beams; the optical correction system comprises N-1 light splitting structures, wherein light receiving surfaces of the N-1 light splitting structures are parallel to each other; the N-1 light splitting structures are used for adjusting the propagation directions of the N linear polarization state display light beams according to the control signals, so that the display light beams with the propagation directions adjusted are propagated to the positions corresponding to the N visual angles. The application discloses display module assembly can realize the multi-view of single module and adjust.

Description

Display module, head-up display system and display method

Technical Field

The application belongs to the technical field of display, and particularly relates to a display module, a head-up display system and a display method.

Background

At present, electronic products with display screens are applied more and more widely in various fields, such as various communication products, head-up systems and the like.

However, the display module of the conventional display screen can only display a picture at one position, but cannot display pictures at different positions simultaneously. For example, a conventional single display module cannot simultaneously display a screen at a position where a front windshield of a vehicle faces a driver and at a position where the front windshield faces a passenger seat.

Disclosure of Invention

The embodiment of the application provides a display module, a head-up display system and a display method, and can solve the problem that the display module in the prior art can only display a picture at one position but cannot display the picture at different positions simultaneously.

In a first aspect, a display module is provided, which includes: the control system is connected with the image source system and the optical correction system and used for outputting control signals to the image source system and the optical correction system; the image source system is used for emitting N linear polarization state display light beams in different N time intervals according to the control signal, wherein N is a positive integer greater than 2; the optical correction system is positioned on the propagation paths of the N linear polarization state display light beams; the optical correction system comprises N-1 light splitting structures, wherein light receiving surfaces of the N-1 light splitting structures are parallel to each other; the N-1 light splitting structures are used for adjusting the propagation directions of the N linear polarization state display light beams according to the control signals, so that the display light beams with the propagation directions adjusted are propagated to the positions corresponding to the N visual angles.

In a second aspect, a head-up display system is provided, which includes the display module of the first aspect.

In a third aspect, a display method is provided, which is applied to the display module of the first aspect, and the method includes:

the control system outputs control signals to the image source system and the optical correction system;

the image source system emits N linear polarization state display light beams corresponding to the signal source in N time intervals according to the control signal, wherein N is a positive integer greater than 2;

the optical correction system adjusts the propagation directions of the N display beams according to the control signal, so that the display beams corresponding to the signal source with the adjusted propagation directions propagate to the positions corresponding to the N viewing angles.

Compared with the prior art, the display module provided by the embodiment of the application comprises a control system, an image source system and an optical correction system, wherein the optical correction system comprises N-1 light splitting structures which are parallel to each other; the image source system emits N linear polarization state display light beams at different N time intervals according to a control signal output by the control system, the N-1 light splitting structures are positioned on a propagation path of the display light beams, the light splitting structures can transmit the display light beams to enable the display light beams to propagate to the next light splitting structure, the light splitting structures can also adjust the propagation direction of the display light beams to enable the display light beams not to propagate to the position corresponding to a certain visual angle, further, the control system can adjust the propagation direction of the N linear polarization state display light beams by controlling the N-1 light splitting structures, accordingly, the display light beams corresponding to the signal source after the propagation direction is adjusted propagate to the position corresponding to the N visual angles, finally, N pictures can be formed at the N positions, and multi-visual angle adjustment of a single module is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below 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 view of a display module according to an embodiment of the present disclosure.

Fig. 2 is a schematic view of a light splitting structure provided in an embodiment of the present application.

Fig. 3 is a schematic view of another display module according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram of an imaging situation at time t1 in the embodiment of the present application.

Fig. 5 is a schematic diagram of an imaging situation at time t2 in the embodiment of the present application.

Fig. 6 is a schematic diagram of an imaging situation at time t3 in the embodiment of the present application.

Fig. 7 is a schematic view of another display module according to an embodiment of the present disclosure.

Fig. 8 is a schematic diagram of a timing signal according to an embodiment of the present application.

Fig. 9 is a schematic diagram of an image source system according to an embodiment of the present application.

Fig. 10 is a schematic view of another display module according to an embodiment of the present disclosure.

Fig. 11 is a schematic structural diagram of a head-up display system according to an embodiment of the present disclosure.

Fig. 12 is a schematic structural diagram of another head-up display system according to an embodiment of the present disclosure.

Fig. 13 is a schematic structural diagram of another head-up display system according to an embodiment of the present disclosure.

Fig. 14 is a flowchart illustrating a display method according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

As described in the background section, the inventors have found the following technical problems: the common display module can only display pictures at one position, but cannot display pictures at different positions simultaneously. In the prior art, the display frames are displayed at different positions simultaneously, and a plurality of display modules are needed to realize the display.

Furthermore, the inventors have also found that although some solutions for dual-view display using the spatial division method exist in the prior art, there is a large crosstalk in the dual-view display, the resolution is lost by half, and the intermediate viewing angle cannot view a normal picture.

The inventors have found that the reason why the above-described problem occurs in the dual view display is that the grating has a plurality of diffraction orders, and the light intensity of orders other than the main diffraction order cannot be reduced to 0, and therefore, two screens are superimposed in the central region, and therefore, a crosstalk region exists in the central region.

In addition, the spatial segmentation method displays two images simultaneously, which results in half-reduced pixels of each image and enhanced graininess.

In order to solve the above technical problem, an embodiment of the present application provides a display module, a head-up display system and a display method, where the display module includes a control system, an image source system and an optical correction system, and the optical correction system includes N-1 mutually parallel light splitting structures; the image source system emits N linear polarization state display light beams at different N time intervals according to a control signal output by the control system, the N-1 light splitting structures are positioned on a propagation path of the display light beams, the light splitting structures can transmit the display light beams to enable the display light beams to propagate to the next light splitting structure, the light splitting structures can also adjust the propagation direction of the display light beams to enable the display light beams not to propagate to the position corresponding to a certain visual angle, further, the control system can adjust the propagation direction of the N linear polarization state display light beams by controlling the N-1 light splitting structures, so that the display light beams corresponding to the signal source after the propagation direction is adjusted propagate to the position corresponding to the N visual angles, finally, N pictures can be formed at the N positions, and multi-visual angle adjustment of a single module is achieved. In addition, the head-up display system using the display module can simultaneously display different pictures at different positions. For example, when the head-up display system is applied to a vehicle, a driver, a passenger seat, and a rear passenger can see different display screens at different positions, and further, since the screens are not superimposed on each other between different viewing angles, the above crosstalk problem does not occur.

The display module, the head-up display system and the display method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display module according to an exemplary embodiment.

As shown in fig. 1, the display module may include a control system 10, an image source system 20, and an optical correction system 30, wherein the image source system 20 and the optical correction system 30 are connected to the control system 10.

And a control system 10 for outputting control signals to the image source system 20 and the optical correction system 30.

And the image source system 20 is configured to emit N display beams 40 in linear polarization states at different N time intervals according to the control signal output by the control system 10, where N is a positive integer greater than 2.

And an optical correction system 30 located in the propagation path of the N linearly polarized display beams 40.

The optical correction system 30 includes N-1 light splitting structures 31, and light receiving faces of the N-1 light splitting structures 31 are parallel to each other.

And the N-1 light splitting structures 31 are configured to adjust the propagation directions of the N linearly polarized display light beams 40 according to a control signal output by the control system 10, so that the display light beams with the adjusted propagation directions propagate to positions corresponding to the N viewing angles.

The following describes the display module in detail, specifically as follows:

the control system 10 may be a device or apparatus, such as a single chip, a microcontroller, a microprocessor, etc., capable of executing the functions of the control system described above and outputting corresponding control signals.

The image source system 20 may be a device or apparatus capable of emitting image light, and the image light emitted from the image source system may be a display beam in a linear polarization state. The image source system 20 may be a liquid crystal display LCD screen, an OLED screen, a mini-LED screen or a micro-LED screen, or may be a digital light processing DLP display device using a projection principle.

The optical correction system 30 includes N-1 light splitting structures 31. Wherein each light splitting structure 31 may have an on state and an off state. When the display light beam passes through the spectroscopic structure 31, the state of the spectroscopic structure is different, and the propagation direction of the display light beam emitted from the spectroscopic structure is also different.

As an example, in the case where the light splitting structure 31 is in the on state, after the display light beam passes through the light splitting structure, the propagation direction of the display light beam is the same as that before the display light beam enters the light splitting structure 31; in the case where the light splitting structure 31 is in the off state, after the display beam passes through the light splitting structure 31, the propagation direction of the display beam is different from that before the display beam enters the light splitting structure 31.

As another example, in the case where the light splitting structure 31 is in the on state, after the display beam passes through the light splitting structure 31, the propagation direction of the display beam is different from that before the display beam enters the light splitting structure 31; in the case where the light splitting structure 31 is in the off state, after the display light beam passes through the light splitting structure 31, the propagation direction of the display light beam is the same as that before the display light beam enters the light splitting structure 31.

The light splitting structure 31 has a light receiving surface and a light exit surface, and N-1 light splitting structures 31 are arranged side by side, and the light receiving surfaces of the N-1 light splitting structures 31 are parallel to each other. The emergent direction of the display light beam at the image source system 20 is a first direction, and the first direction may be perpendicular to the light receiving surfaces of the N-1 light splitting structures 31.

Thus, after the display light beam passes through the first light splitting structure, the display light beam directly enters the light receiving surface of the second light splitting structure; after the display beam passes through the first light splitting structure and is changed in the propagation direction by the first light splitting structure, the display beam may propagate to the second direction without being incident on the second light splitting structure. Similarly, after the display light beam passes through the second light splitting structure, the display light beam directly enters the light receiving surface of the third light splitting structure; after the display light beam passes through the second light splitting structure and the propagation direction of the second light splitting structure is changed, the display light beam can propagate to the third direction without being incident into the third light splitting structure, and therefore the propagation directions of the N display light beams can be adjusted to N directions by controlling the states of the N-1 light splitting structures. The N directions may correspond to the N viewing angles in the foregoing, that is, N frames may be finally formed at N positions, thereby realizing multi-view adjustment of a single module.

In some embodiments, in order to better adjust the propagation direction of the beam bundle, as shown in fig. 2, the light splitting structure 31 in the above embodiments may include a polarization control box 311 and a metal wire grid 312, which are sequentially disposed.

The light receiving surface of the foregoing light dispersing structure 31 may be the light receiving surface 3111 of the polarization control box 311. That is, the light-receiving faces of the N-1 polarization control boxes are parallel to each other.

Polarization control box 311 is located on the surface of image source system 20 on the light-emitting side. In practical implementation, the image source system 20 and the polarization control box 311 may be two independent devices, or the polarization control box 311 may be attached to the surface of the light-emitting side of the image source system 20.

Note that, here, the metal wire grid 312 is not parallel to the light receiving surface of the polarization control box 311. The metal wire grid 312 intersects but is not perpendicular to the first direction as described above.

In this embodiment, the polarization control box 311 is used to modulate the polarization state of the display light beam, for example, the display light beam can be modulated into different polarization directions at different times, so that the display light beam is reflected or transmitted when being incident on the metal wire grid.

Here, after the display beam is incident on the polarization control box of the first light splitting structure, the polarization control box may modulate the polarization state of the display beam to be reflected by the metal wire grid to the second direction or to be transmitted from the metal wire grid to the polarization control box of the second light splitting structure. Similarly, the polarization control box of the second light splitting structure may modulate the polarization state of the display beam to be reflected by the wire grid to the third direction, or to be transmitted from the wire grid to the polarization control box of the third light splitting structure. That is, by controlling the two polarization control boxes, the traveling direction of the display beam can be adjusted to three traveling directions. Thus, in the case of having N-1 polarization control boxes in the embodiment of the present application, the propagation directions of the N display beams can be adjusted to N directions by controlling the polarization control boxes of the N-1 light splitting structures through the control process similar to the above. These N directions may correspond to the N views in the foregoing.

In some embodiments, in order to better adapt to the wavelength of the visible light and make the metal wire grid have better refraction effect on the visible light, the grid pitch of the metal wire grid 312 of the light splitting structure 31 in the above embodiments may be 1 to 200nm, preferably 50 to 100nm, the polarization direction of the incident light is parallel to the grid direction and will be reflected (S light), and the polarization direction of the incident light is perpendicular to the grid direction and will be transmitted (P light).

The grating period is the length from one index change point to another index change point that is adjacent. The metal wire grids with different grating periods can be selected according to actual needs, and then the polarized light in the first polarization direction and the polarized light in the second polarization direction are well separated. In this embodiment, the grating period range of the metal wire grid is 1nm to 200nm, and further optionally, the grating period range of the metal wire grid is 50nm to 100 nm. The effect is better when the grating period is one tenth of the light wavelength, and the display module utilizes visible light for imaging, and the visible light range is about 400nm-800nm, so the grating period range of the selected metal wire grating is 50 nm-100 nm, and the effect is better.

In some embodiments, to better change the polarization state of the display beam, the polarization control box 311 in the above embodiments can be a TN type liquid crystal control box or an ECB electrically controlled birefringence box, both of which can change the polarization state of the display beam to generate equivalent optical rotation effect.

The TN liquid crystal control box or the electric control birefringence box can be arranged independently, or can be arranged in a manner of being attached to the light emitting surface of the image source system 20. The polarization control box is attached to the image source system 20, so that the size of the display module can be reduced, and the whole appearance of the display module can be smaller and more exquisite.

The basic structures of the TN type liquid crystal control box and the electric control birefringence box are similar, and the adjustment of the polarization state of light is realized by changing the arrangement mode of liquid crystal molecules by applying an electric field, which is the same as the prior art and is not repeated herein.

In some embodiments, N may be equal to 3, and accordingly the optical correction system 30 includes a first light splitting structure 32 and a second light splitting structure 33. In addition, in order to make the display module adapt to the viewing crowd at different positions and make the display module further adjust the imaging position of the display beam after being installed, the optical correction system 30 may further include a first reflection structure 34 and a second reflection structure 35.

The first reflecting structure 34 is located at one side of the first light splitting structure 32; and the second reflecting structure 35 is positioned on the side of the second light splitting structure 33 far away from the first reflecting structure 34.

The first reflecting structure 34 is used for reflecting the first display beam with the propagation direction adjusted by the first light splitting structure 32 to the first viewing angle.

The second reflecting structure 35 is used for reflecting the second display beam with the propagation direction adjusted by the second light splitting structure 33 to the second viewing angle.

The first light splitting structure 32 and the second light splitting structure 33 may be the same as or different from the light splitting structure 31 in the above-described embodiment. Here, the first light splitting structure 32 and the second light splitting structure 33 are explained in detail by taking the same example as the light splitting structure 31 in the above-described embodiment.

In the optical correction system 30, the first light splitting structure 32 may include a first polarization control box and a first metal wire grid; the second light splitting structure 33 may include a second polarization control box and a second metal wire grid.

The first and second polarization control boxes may be arranged in parallel.

The first polarization control box is not parallel to the first metal wire grid, and the second polarization control box is not parallel to the second metal wire grid. The first polarization control box may be at an acute angle to the first metal wire grid.

As an example, the first polarization control box has an angle of 45 ° with the first wire grid, and the first wire grid has an angle of 90 ° with the second wire grid. Therefore, the first metal wire grid can adjust the transmission direction of the display light beam to be parallel to the first polarization control box, and similarly, the second metal wire grid can also adjust the transmission direction of the display light beam to be parallel to the first polarization control box, namely, the transmission directions of the two display light beams after the transmission directions are adjusted are parallel and cannot influence each other.

It is understood that when the display light beam emitted from the image source system 20 is polarized light with the first polarization direction, the polarization control box 311 does not change the polarization state of the display light beam during the first display time period t1, and during the second display time period t2, the polarization control box 311 modulates the display light beam into polarized light with the second polarization direction.

When the display light beam emitted from the image source system 20 is polarized light in the second polarization direction, the polarization control box 311 modulates the display light beam into polarized light in the first polarization direction in the first display time period t1, and the polarization control box 311 does not change the polarization state of the display light beam in the second display time period t 2.

The vibration directions of the first polarization direction polarized light and the second polarization direction polarized light are perpendicular, that is, the polarization control box 311 functions to rotate the polarization direction of the display beam by 0 ° (without adjusting the polarization state) or 90 °.

Based on the above, the following describes in detail the display process corresponding to each time, taking the polarized light in the first polarization state as an example of the display light beam emitted from the image source system 20.

As shown in fig. 4, at time t1, the image source system 20 may emit a display beam corresponding to the a picture, where the first polarization control box is opened and the polarization state is unchanged, and the second polarization control box is opened and the polarization state is unchanged, so that the a picture is finally observed at the first viewing angle.

As shown in fig. 5, at time t2, the image source system 20 may emit a display light beam corresponding to a B picture, the first polarization control box is closed, the polarization state is changed, the light path does not pass through the second polarization control box, and the second polarization control box is preferably closed, so that the emitted light will enter human eyes after being reflected by the first reflection structure 34, and the B picture is observed at the second viewing angle.

As shown in fig. 6, at time t3, the image source system 20 may emit a display light beam corresponding to the C picture, where the first polarization control box is opened, the polarization state is unchanged, the second polarization control box is closed, and the polarization state is changed, so that the emitted light beam enters human eyes after being reflected by the second reflection structure 35, and the C picture is observed at a third viewing angle.

Thus, the human eye can see three pictures at three viewing angles by repeating the times t1, t2 and t3 in a loop. It should be noted that the switching time interval is lower than the resolution time of human eyes, so that the human eyes can see three pictures at different positions simultaneously. In order to achieve the above effect, it is preferable to set the times t1, t2 and t3 as mentioned above

To reduce the flicker situation of the picture.

In some embodiments, the first reflective structure 34 and/or the second reflective structure 35 may comprise a mirror. A first angle adjustment assembly may be coupled to the mirror.

The first angle adjusting assembly is used for adjusting the pose angle of the reflecting mirror.

As one example, the first angle adjustment assembly may be an adjustment motor, such as a servo motor or the like. The adjustment motor can be connected with the control system 10, so that a user can adjust the pose angle of the reflecting mirror through the control system 10. The position and attitude angle change of the reflector can change the propagation direction of the display light beam, and further adjust the imaging position of the display light beam. Therefore, the change of the imaging position can adapt to the watching crowds at different positions.

As another example, the first angle adjustment assembly may also be a mounting structure for mounting the mirror, and the attitude angle of the mirror may be adjusted by adjusting the angle of the mounting structure. The angle of the adjusting installation structure can be adjusted manually by a user, and can also be adjusted automatically by connecting with a mechanical device, which is not limited herein.

In the embodiment of the application, the reflecting structure comprises the first angle adjusting assembly, the first angle adjusting assembly can adjust the pose angle of the reflecting mirror, and then the transmission angle of the display light beam of the reflecting mirror can be adjusted, so that the adjustment of the display visual angle is realized. Therefore, the display module can not only simultaneously display different pictures at a plurality of different visual angles, but also further adjust the position of the visual angle.

In some embodiments, in order to allow the control system to better control the image source system 20 and to more precisely control the N-1 light splitting structures of the optical correction system, the control system 10 may include a timing control unit 11 and N driving units 12, as shown in fig. 7.

The timing control unit 11 is connected to the N driving units 12. The N driving units 12 are respectively connected to the image source system 20 and the N-1 light splitting structures 31.

The timing control unit 11 is configured to output a timing control signal.

The N driving units 12 are connected to output N different driving control signals to the image source system 20 at N different time intervals based on the timing control signal, and enable the N-1 light splitting structures 31 to adjust the propagation directions of the N linear polarization state display light beams based on the timing control signal, so that the display light beams with the adjusted propagation directions propagate to positions corresponding to the N viewing angles.

The timing control signal output by the timing control unit 11 may be a driving voltage signal. The drive voltage signal may comprise high/low levels and may correspond to the on/off states of the polarization control box.

Taking N equal to 3 as an example, the corresponding relationship between the timing control signal sent by the timing control unit 11 and each viewing angle of the display module in the above embodiment is described.

As shown in fig. 8, the solid line high and low of the image source system 20 indicates the switching between a/B/C picture signals. The details are as follows:

at time t1, the image source system 20 may emit a display beam corresponding to the a picture, the first polarization control box is opened, the polarization state is unchanged, the second polarization control box is opened, and the polarization state is unchanged, so that the a picture is finally observed at the first viewing angle.

At time t2, the image source system 20 may emit a display light beam corresponding to the B picture, the first polarization control box is closed, the polarization state is changed, the light path does not pass through the second polarization control box, and the second polarization control box is preferably closed, so that the emitted light will enter human eyes after being reflected by the first reflection structure, and the B picture is observed at the second viewing angle.

At time t3, the image source system 20 may emit a display beam corresponding to the C picture, the first polarization control box is opened, the polarization state is unchanged, the second polarization control box is closed, and the polarization state is changed, so that the emitted light enters human eyes after being reflected by the second reflection structure, and the C picture is observed at the third viewing angle.

Similarly, a picture a is observed at the first view angle at time t4, a picture B is observed at the second view angle at time t5, and a picture C is observed at the third view angle at time t 6.

Wherein the time interval between t1 and t4 is lower than the resolving time of the human eye.

In the embodiment of the present application, the image source system 20 emits a display light beam with a specific polarization direction, and the plurality of driving units 12 can respectively control the light splitting structure 31 and the image source system 20 based on the timing control signal output by the timing control unit 11. For example, when there are 3 light splitting structures 31, two light splitting structures 31 are divided into 3 small periods in one time domain period, and the display box picture of each small period may be different. That is to say, the display module that this application embodiment provided can form the demonstration of 3 visual angles with the time domain segmentation method, has improved the unable normal problem of watching of dual-view display center visual angle among the prior art.

In some embodiments, to facilitate the optical correction system to adjust the propagation direction of the display beam, the image source system itself may emit the display beam in a polarized state, or a polarization structure may be added to emit the display beam in a polarized state. As shown in fig. 9, the image source system 20 may include a signal source 21, a display unit 22, and a polarizer 23.

The signal source 21 is connected to the display unit 22. The display unit 22 receives the signal from the signal source 21 and emits N display beams corresponding to the signal source 21.

The display light beam emitted from the display unit 22 may be a display light beam in a polarized state or may not be a display light beam in a polarized state. The display unit 22 may be an organic light emitting display panel or a liquid crystal display panel.

The structure of the organic light emitting display panel or the liquid crystal display panel is the same as that of the panel in the prior art, and is not described herein again.

The polarizer 23 is located on the light emitting side of the display unit 22, and may be used to adjust the display beam emitted from the display unit 22 into a linearly polarized display beam. This ensures that the display beam emitted from the image source system 20 is in a polarization state. Therefore, the optical correction system can enable the display beams with different polarization states to correspond to different propagation directions by adjusting the polarization states of the display beams. For example, the display beam is incident on the metal wire grid, and the metal wire grid has different adjustment effects on the display beam in different polarization states, and the different adjustment effects correspond to different propagation directions.

The description of the light splitting structure 31 in the above embodiment is incorporated. When the polarization state of the display light beam emitted from the image source system 20 is perpendicular to the extending direction of the metal wires of the metal wire grid, a first voltage difference may be applied between the first electrode plate and the second electrode plate of the polarization control box in the first display time period t1, so that the arrangement direction of the liquid crystal molecules between the first electrode plate and the second electrode plate is laterally deflected, and the polarization direction of the polarized light is changed into the first polarization direction. The first polarization direction polarized light is reflected by the metal wire grid to a first viewing angle. The process is similar for the t2 time period and the t3 time period, and is not repeated here.

In some embodiments, in order to better protect the display module and reduce the influence of the external environment on the optical performance of the optical calibration system, as shown in fig. 10, the display module may further include a first housing 50. The control system 10, the image source system 20 and the optical correction system 30 are all mounted within the first housing 5.

The first housing 50 is provided with a first light outlet at a position corresponding to the exit direction of the display light beam. The display light beams can be emitted from the first light outlet to different viewing angles.

The material of the first housing 50 is not limited, and is preferably a black high-temperature-resistant plastic material or a resin material, and the first light outlet may be a window formed in the first housing 50.

In addition, the first housing 50 may further have a heat dissipation structure 52 near the image source system 20.

The first housing 50 can protect the structures such as the image source system 20 and the optical correction system 30 inside, and reduce the risk of collision. In addition, the first housing 50 can also prevent the optical correction system 30 and the like from being affected by dust in optical performance.

In some embodiments, a first transparent cover plate 51 is disposed at the first light outlet of the first casing 50.

The first transparent cover plate 51 shields the first light outlet, so that dust cannot enter the first housing from the first light outlet, and the transparency of the cover plate does not affect the light emission. That is, the addition of the first transparent cover plate can prevent external dust from entering and ensure that internal light can be emitted.

The transparent cover plate is preferably flat, is preferably made of a flexible material such as plastic or resin, and preferably has an antireflection film on the inner surface side, and more preferably has an antireflection film on both the inner and outer surfaces.

The provision of the antireflection film can reduce the loss of the display light beam when passing through the first transparent cover plate 51.

FIG. 11 is a schematic diagram illustrating a head-up display system in accordance with an exemplary embodiment.

As shown in fig. 11, the head-up display system 60 includes the display module 61 in any of the above embodiments.

The head-up display system 60 is also called head-up display, HUD for short. The head-up display system 60 is a multifunctional instrument panel that is operated by a driver as a center and is operated by a blind person.

The head-up display system 60 is used for projecting important driving information such as speed per hour, navigation and the like onto a windshield in front of a driver, so that the driver can see the important driving information such as speed per hour, navigation and the like without lowering head or turning head as much as possible.

The head-up display system 60 provided by the embodiment of the application has a similar implementation principle to the display module 61 in the previous embodiment, and can simultaneously display different pictures at different positions. That is, the head-up display system 60 can display important driving information such as speed per hour and navigation at the viewing angle corresponding to the driving; displaying pictures such as movie videos and the like at a visual angle corresponding to the copilot; and displaying pictures such as movie videos and the like at the middle visual angle corresponding to the passengers in the back row. Therefore, the simultaneous watching requirements of a main driver, a subsidiary driver and rear-row passengers are met by one display module.

In some embodiments, to accommodate more application scenarios, the heads-up display system 60 may also include a diffraction screen 62, as shown in FIG. 12.

The diffraction screen 62 is used to project the display light beam corrected by the optical correction system to the human eye.

The diffraction screen 62, may be a separate device in the head-up display system 60. The corresponding component may also be selected as the diffraction screen 62 based on the installation environment of the head-up display system 60.

As one example, the heads-up display system 60 may be mounted within a vehicle. In this case, the diffraction screen 62 may be a front windshield of the vehicle. The display module 61 projects the display light beam to the front windshield, and the front windshield projects the display light beam to a corresponding viewing angle. With front windshield as the diffraction screen, the user can directly see the image on front windshield, compares display module's display beam and directly gets into people's eye, through front windshield's diffraction, light can be softer, and is littleer to the stimulation of people's eye.

As another example, the heads-up display system 60 may also be mounted within an aircraft. In this case, the diffraction screen 62 may be a front windshield of the aircraft. The display module 61 projects the display light beam to the front windshield, and the front windshield projects the display light beam to a corresponding viewing angle.

In the embodiment of the present application, the diffraction screen 62 is added on the basis of the display module 61, and the diffraction screen 62 can change the propagation direction of the display beam emitted by the display module 61. So, display module assembly 61 just need not just to user's installation, through the cooperation of display module assembly 61 with diffraction screen 62, installation setting between them just can adapt to more application scenes.

In some embodiments, to enable the heads-up display system to be installed to accommodate users in different locations, the heads-up display system may further include at least one curved mirror, as shown in FIG. 13.

The curved mirror 63 is located on a propagation path of the display beam emitted by the display module 61, and is used for adjusting the propagation direction of the display beam emitted by the display module 61 to the diffraction screen 62.

The curved mirror 63 here is a free-form mirror 63. Curved mirrors 63 of different curvatures may be provided for different installation environments.

Thus, the display beam emitted from the display module 61 passes through the curved mirror 63 and then reaches the diffraction screen 62, and the diffraction screen 62 projects the display beam to a corresponding viewing angle. Therefore, under the condition that the position of the diffraction screen 62 is fixed and immovable, the display module 61 and the curved mirror 63 are matched with each other, the installation position of the display module 61 can be adjusted, and further more application environments can be applied. For example, in the foregoing vehicle, when the driver or passenger thinks that the position of the imaging angle of view does not correspond to the seat of the driver or passenger, the imaging position of the display beam can be adjusted by adjusting the angle of the curved mirror 63, so that the position of the imaging angle of view corresponds to the seat, and thus the viewing experience of the user will be better.

In some embodiments, to facilitate adjustment of the pose angle of the curved mirror 63, a second angle adjustment assembly may be attached to the curved mirror 63. The second angle adjustment assembly is used to adjust the angle of the curved mirror 63 to adjust the projection position of the display beam on the diffraction screen 62.

As one example, the second angle adjustment assembly may be a rotary motor, such as a servo motor or the like. The rotating motor can be connected with a control system, so that a user can adjust the pose angle of the curved mirror 63 through the control system to adapt to observers with different heights.

As another example, the second angle adjustment assembly may also be a mounting structure for mounting the curved mirror 63, and the attitude angle of the curved mirror 63 may be adjusted by adjusting the angle of the mounting structure. The angle of the adjusting installation structure can be adjusted manually by a user, and can also be adjusted automatically by connecting with a mechanical device, which is not limited herein.

In the embodiment of the application, under the condition that the positions of the display module 61 and the diffraction screen 62 are fixed, the second angle adjusting assembly adjusts the pose angle of the curved mirror 63, so that the projection position of the display beam on the diffraction screen 62 can be changed, the position of the visual angle is adjusted, and the display device is suitable for users at different positions. For example, in a vehicle, adjusting the position of the curved mirror 63 via the second angle adjustment assembly allows the primary rider, the secondary rider, and the rear passenger to view different views at a comfortable angle.

It should be noted that, when the number of the curved mirrors 63 is 1, and the second angle adjustment assembly is adjusted, the viewing angles of the main driver, the sub driver, and the rear passenger are all changed; under the condition that the number of the curved mirrors 63 is 3, when the second angle adjusting assembly is adjusted, the viewing angle of any user of a main driver, a secondary driver and a rear passenger can be independently adjusted, and the personalized requirements of the user can be met.

In some embodiments, to further enhance the viewing experience of the user, the curved mirror 63 is further coupled to a displacement adjustment assembly, which is coupled to the control system.

The displacement adjusting assembly is used for adjusting the position of the curved mirror 63 to adjust the size of the virtual image corresponding to the display beam.

The displacement adjustment assembly may be a translation motor, the translation motor may be connected to a control system, and a user may adjust the position of the curved mirror 63 via the control system. The displacement adjustment assembly may also be a corresponding mechanical structure. The user may manually adjust the position of the curved mirror 63.

Here, the display beam may correspond to a virtual image. The size of the virtual image can be adjusted by adjusting the propagation distance between the display beam from the first light outlet of the display module 61 and the diffraction screen 62. So, adjust the position of curved mirror 63 through the displacement, can change the propagation distance between first light-emitting window to diffraction screen 62 of display module assembly 61, and then can adjust the size of virtual image, and then the user can adjust the picture size that obtains the preferred.

In some embodiments, to better protect the display system and reduce the influence of the external environment on the display system, the head-up display system 60 may be further provided with a second housing. The display module 61 is installed in the second housing. The second shell is provided with a second light outlet at a position corresponding to the emergent direction of the display light beam.

Here the second housing may be provided outside the first housing of the above embodiment.

In the case where the head-up display system 60 has the second housing, the display module 61 may not have the first housing.

The second housing is preferably made of black high-temperature-resistant plastic or resin, and the second light outlet may be a window formed in the second housing.

This second casing can protect inside display module assembly 61 isotructure, reduces the risk of colliding with. In addition, the second housing can also reduce the influence of dust on the optical performance of the optical correction system and the like.

In some embodiments, a second transparent cover plate is disposed at the second light outlet of the second shell.

This transparent cover of second has sheltered from the second light-emitting window and can prevent that outside dust from getting into, adopts transparent material can also guarantee the emergence of inside light simultaneously.

In some embodiments, the second transparent cover plate is provided with an antireflection film at the incident and/or exit face of the display light beam without the first transparent cover plate.

In the case of the first transparent cover plate, the second transparent cover plate is preferably coated with an antireflection film on the inner surface (close to the image source system) and a highly reflective film on the outer surface (far from the image source system) for higher display effect.

The second transparent cover plate can be a curved surface or a plane surface, is preferably a plane shape, and is preferably made of flexible materials such as plastics, resin and the like.

The embodiment of the application further provides a display method, which is suitable for the display module provided by any one of the embodiments.

As shown in fig. 14, the display method may include steps 141 to 143.

Step 141, the control system outputs control signals to the image source system and the optical correction system.

And 142, the image source system emits N linear polarization state display light beams corresponding to the signal source in N time intervals according to the control signal, wherein N is a positive integer greater than 2.

Step 143, the optical correction system adjusts the propagation directions of the N display beams according to the control signal, so that the display beams corresponding to the signal source whose propagation directions are adjusted propagate to the positions corresponding to the N viewing angles.

In step S141, the control signal may be a timing control signal.

In step S142, when the display module is applied to a head-up display system, N is preferably 2.

In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A display module, comprising:

the control system is connected with the image source system and the optical correction system and used for outputting control signals to the image source system and the optical correction system;

the image source system is used for emitting N linear polarization state display light beams in different N time intervals according to the control signal, wherein N is a positive integer greater than 2;

the optical correction system is positioned on the propagation paths of the N linear polarization state display light beams; the optical correction system comprises N-1 light splitting structures, wherein light receiving surfaces of the N-1 light splitting structures are parallel to each other; the N-1 light splitting structures are used for adjusting the transmission directions of the N linear polarization state display light beams according to the control signals, so that the display light beams with the adjusted transmission directions can be transmitted to the positions corresponding to the N visual angles.

2. The display module according to claim 1, wherein the light splitting structure comprises a polarization control box and a metal wire grid arranged in sequence.

3. The display module according to claim 2, wherein the grid pitch of the metal wire grid is 1-200 nm.

4. The display module according to claim 2, wherein the polarization control cell is a TN mode liquid crystal control cell or an electrically controlled birefringence cell.

5. The display module of claim 1, wherein N is equal to 3; the optical correction system comprises a first light splitting structure and a second light splitting structure; the optical correction system further includes:

the first reflection structure is positioned at one side of the first light splitting structure and used for reflecting the first display light beam of which the propagation direction is adjusted by the first light splitting structure to a first visual angle;

and the second reflection structure is positioned on one side of the second light splitting structure, which is far away from the first reflection structure, and is used for reflecting the second display light beam of which the propagation direction is adjusted by the second light splitting structure to a second visual angle.

6. The display module according to claim 5, wherein the first reflective structure and/or the second reflective structure comprises:

a mirror;

and the first angle adjusting assembly is used for adjusting the pose angle of the reflecting mirror.

7. The display module of claim 1, wherein the control system comprises:

the time sequence control unit is connected with the N driving units and used for outputting time sequence control signals;

the N driving units are respectively connected to the image source system and the N-1 light splitting structures, and configured to output N different driving control signals to the image source system at N different time intervals based on the timing control signal, and enable the N-1 light splitting structures to adjust the propagation directions of the N linearly polarized display light beams based on the timing control signal, so that the display light beams whose propagation directions are adjusted propagate to positions corresponding to N viewing angles.

8. The display module of claim 1, wherein the image source system comprises:

a signal source;

the display unit is used for emitting N display light beams corresponding to the signal source;

and the polaroid is positioned on the light emitting side of the display unit and used for adjusting the display beams emitted by the display unit into linear polarization state display beams.

9. The display module according to claim 1, wherein the display module is further provided with a first housing; the control system, the image source system and the optical correction system are all arranged in the first shell; the first shell is provided with a first light outlet at a position corresponding to the emergent direction of the display light beam.

10. The display module assembly according to claim 9, wherein a first transparent cover plate is disposed at the first light outlet of the first housing.

11. The display module according to claim 10, wherein the first cover plate is provided with an antireflection film on an incident surface and/or an exit surface of the display beam.

12. A head-up display system comprising a display module as claimed in any one of claims 1 to 11.

13. The heads up display system as claimed in claim 12, further comprising:

a diffraction screen for projecting the display beam corrected by the optical correction system to a human eye.

14. The heads up display system as claimed in claim 13, further comprising:

and the curved mirror is positioned on the transmission path of the display beam emitted by the display module and used for adjusting the transmission direction of the display beam emitted by the display module to the diffraction screen.

15. The heads up display system of claim 14, wherein a second angular adjustment assembly is coupled to the curved mirror; the second angle adjusting component is used for adjusting the angle of the curved mirror so as to adjust the projection position of the display light beam on the diffraction screen.

16. A heads up display system as claimed in claim 14 wherein a displacement adjustment assembly is further coupled to the curved mirror, the displacement adjustment assembly being coupled to the control system; the displacement adjusting assembly is used for adjusting the position of the curved mirror so as to adjust the size of the virtual image corresponding to the display light beam.

17. A heads up display system as claimed in claim 12, wherein the heads up display system is further provided with a second housing; the display module is arranged in the second shell; and a second light outlet is formed in the position of the second shell corresponding to the emergent direction of the display light beam.

18. The heads-up display system of claim 17, wherein a second transparent cover is disposed at the second light exit of the second housing.

19. A head-up display system according to claim 18, wherein the second transparent cover is provided with an antireflection film at an incident surface and/or an exit surface of the display light beam.

20. The heads up display system of claim 19, wherein the display module first housing includes a first transparent cover at the light exit; the first transparent cover plate is provided with a high-reflection film on the emergent surface of the display light.

21. A display method applied to the display module set of any one of claims 1-11, the method comprising:

and the optical correction system adjusts the propagation directions of the N display beams according to the control signal so as to enable the display beams corresponding to the signal source after the propagation directions are adjusted to propagate to the positions corresponding to the N visual angles.