Projection device and projection system

Abstract

Provided in the present disclosure are a projection device and a projection system. The projection device comprises: a projection lens; a light-emitting assembly, configured to emit first initial polarized light and second initial polarized light, wherein the polarization direction of the first initial polarized light is perpendicular to that of the second initial polarized light; a polarization beam-splitting assembly, configured to reflect the first initial polarized light to obtain reflected polarized light, and allow the second initial polarized light to pass therethrough to obtain transmitted polarized light; and at least one liquid crystal display module, wherein the at least one liquid crystal display module is arranged on a propagation optical path of the transmitted polarized light, and / or the at least one liquid crystal display module is located on a propagation optical path of the reflected polarized light; the at least one liquid crystal display module is configured to modulate the transmitted polarized light or the reflected polarized light into projection polarized light and reflect same back to the polarization beam-splitting assembly, and the polarization beam-splitting assembly is configured to emit the projection polarized light to the projection lens; and the projection lens is configured to project the projection polarized light to a predetermined area. The projection device and the projection system provided by the present disclosure have a simple optical path.

Description

A projection device and projection system

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411487294.5, filed in China on October 23, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to, but is not limited to, the field of display technology, and particularly to a projection device and projection system. Background Technology

[0004] In recent years, with the rapid development of smart projectors, projection systems have gained increasing attention due to their excellent image presentation and wide application potential. Summary of the Invention

[0005] This disclosure provides a projection device and projection system that achieves projection display through a simple optical path.

[0006] The technical solutions provided in this disclosure are as follows:

[0007] In a first aspect, embodiments of this disclosure provide a projection device, including:

[0008] Projection lens;

[0009] A light-emitting component for emitting a first initial polarized light and a second initial polarized light, wherein the first initial polarized light has a first polarization direction and the second initial polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction.

[0010] A polarization beam splitter is used to reflect the first initial polarized light to obtain reflected polarized light and allow the second initial polarized light to pass through to obtain transmitted polarized light. The reflected polarized light is perpendicular to the propagation direction of the first initial polarized light, and the transmitted polarized light is in the same propagation direction as the second initial polarized light.

[0011] At least one liquid crystal display module, wherein at least one liquid crystal display module is disposed on the propagation optical path of the transmitted polarized light, and / or, at least one liquid crystal display module is located on the propagation optical path of the reflected polarized light;

[0012] In this embodiment, at least one of the liquid crystal display modules is used to modulate the transmitted polarized light or the reflected polarized light into projected polarized light and reflect it back to the polarization beam splitter, the polarization beam splitter is used to emit the projected polarized light to the projection lens; the projection lens is used to project the projected polarized light onto a predetermined area.

[0013] For example, the at least one liquid crystal display module includes a first liquid crystal display module and a second liquid crystal display module, wherein the first liquid crystal display module is located in the propagation optical path of the transmitted polarized light, and the second liquid crystal display module is located in the propagation optical path of the reflected polarized light;

[0014] The first liquid crystal display module is used to modulate the transmitted polarized light into first projected polarized light with a first polarization direction and reflect it back to the polarization beam splitter. The polarization beam splitter is also used to reflect the first projected polarized light to the projection lens. The second liquid crystal display module is used to modulate the reflected polarized light into second projected polarized light with a second polarization direction and reflect it back to the polarization beam splitter. The polarization beam splitter is used to allow the second projected polarized light to pass through and exit to the projection lens. The projection lens is used to project the first projected polarized light and the second projected polarized light onto a predetermined area.

[0015] For example, both the first liquid crystal display module and the second liquid crystal display module include a liquid crystal display panel; the liquid crystal display panel has a display side and a non-display side disposed opposite to each other, and the liquid crystal display panel includes:

[0016] A first substrate and a second substrate are disposed on a box, wherein the first substrate is located on the side of the second substrate closer to the display side;

[0017] A liquid crystal layer disposed between the first substrate and the second substrate; and

[0018] A reflective layer is disposed on the second substrate, and the reflective layer is capable of reflecting incident light from the display side of the liquid crystal display panel back to the display side; wherein,

[0019] The liquid crystal display panel is configured to have a first state and a second state based on different deflection states of the liquid crystal layer. In the first state, the liquid crystal display panel can reflect incident light from the display side of the liquid crystal display panel back to the display side to obtain reflected light, and the polarization direction of the incident light and the reflected light is perpendicular. In the second state, the liquid crystal display panel can reflect incident light from the display side of the liquid crystal display panel back to the display side to obtain reflected light, and the polarization direction of the incident light and the reflected light is the same.

[0020] For example, the liquid crystal display panel is a monochrome display panel; or, the liquid crystal display panel is a color display panel, wherein the liquid crystal display panel has a plurality of pixel units distributed in an array, each pixel unit includes at least two sub-pixels that emit different colors of light, a color filter layer is provided on the first substrate, the color filter layer includes an array of filter units, each filter unit includes at least two filter areas, and one filter area corresponds to at least one of the sub-pixels.

[0021] For example, the second substrate includes a substrate and a pixel driving circuit layer disposed on the substrate, wherein the reflective layer is disposed on the side of the pixel driving circuit layer opposite to the substrate.

[0022] For example, the polarization beam splitter has a polarization beam splitting surface, which is configured to be at a preset angle relative to the first direction, wherein the first direction is the incident direction of the first initial polarized light and the second initial polarized light to the polarization beam splitter, and the first direction is perpendicular to the main optical axis of the projection lens.

[0023] For example, the preset angle is 45°.

[0024] For example, the reflection axis angle of the polarization beam splitter ranges from 0 to 180°.

[0025] For example, the angle between the display side of the first liquid crystal display module and the polarization beam splitter is a first angle α, and the angle between the display side of the second liquid crystal display module and the polarization beam splitter is a second angle β, wherein the value of the first angle α is in the range of 30° to 60°, the value of the second angle β is in the range of 30° to 60°, and α+β=90°.

[0026] For example, the first liquid crystal display module and the second liquid crystal display module are configured to display images symmetrically about a first axis of symmetry; wherein, the angle between the display sides of the first liquid crystal display module and the second liquid crystal display module is a third angle, and the first axis of symmetry is the bisector of the third angle.

[0027] For example, the first liquid crystal display module has a plurality of first pixel units arranged in an array, and the second liquid crystal display module has a plurality of second pixel units arranged in an array, wherein the first pixel units and the second pixel units are symmetrically distributed about the first axis of symmetry; wherein, in any pair of symmetrically distributed first pixel units and second pixel units, the sub-pixel corresponding to the first pixel unit in the first projected polarized light and the sub-pixel corresponding to the second pixel unit in the second projected polarized light are transmitted through the projection lens to the same pixel point on the predetermined area.

[0028] For example, the first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting different colors of light.

[0029] In any pair of symmetrically distributed first pixel units and second pixel units,

[0030] The first sub-pixel in the first pixel unit and the first sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry, and the second sub-pixel in the first pixel unit and the second sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry.

[0031] For example, the first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting different colors of light, wherein, in any pair of symmetrically distributed first pixel units and second pixel units, the second sub-pixel in the first pixel unit and the first sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry, and the first sub-pixel in the first pixel unit and the second sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry.

[0032] For example, the light-emitting component includes:

[0033] A light-emitting component, wherein the diffused light emitted by the light-emitting component includes light rays having a first polarization direction and a second polarization direction;

[0034] A light-concentrating component is disposed in the optical path of the diffused light, and the light-concentrating component is configured to converge the light incident on the light-concentrating component;

[0035] A collimating component is disposed on the propagation path of the light rays converged by the focusing component. The collimating component is configured to output collimated light rays after the light rays converged by the focusing component, and the collimated light rays include the first initial polarized light and the second initial polarized light.

[0036] For example, the principal optical axis of the light-emitting component coincides with the principal optical axes of the focusing component and the collimating component, and the optical path focal point of the focusing component coincides with the rear focal point of the collimating component; or,

[0037] The light-emitting component coincides with the main optical axis of the light-concentrating component and is perpendicular to the main optical axis of the collimating component. The light-emitting component also includes a reflective component, which is disposed on the propagation path of the light after it has been converged by the light-concentrating component. The reflective component is configured to emit the light after it has been converged by the light-concentrating component to the collimating component.

[0038] For example, the focusing component includes a total internal reflection lens, and the collimating component includes a Fresnel lens.

[0039] For example, the polarization beam splitter includes at least one assembly part, and one assembly part corresponds to one liquid crystal display module; at least one liquid crystal display module is mounted on the corresponding assembly part with its display side facing the assembly part, and a sealing structure is provided at least around the display side periphery of the liquid crystal display module at the assembly gap between the liquid crystal display module and the polarization beam splitter.

[0040] For example, the sealing structure includes a hollow area and a solid area located around the hollow area;

[0041] The display side of the liquid crystal display module includes a display area and a peripheral area located around the display area, and the sealing structure is sandwiched between the display side and the assembly part, with the solid area corresponding to the peripheral area; and / or, the display side contacts the assembly part, and the solid area is arranged around the periphery of the liquid crystal display module at least once to seal the gap between the display side and the assembly part.

[0042] For example, the sealing structure includes at least one of foam frame adhesive and sealing silicone.

[0043] For example, the sealing structure includes a light-transmitting layer located between the display side and the assembly part, and adhesive is applied between the peripheral area of ​​the light-transmitting layer and the display side, and between the peripheral area of ​​the light-transmitting layer and the assembly part.

[0044] For example, the polarization beam splitter includes a polarization beam splitter main component and at least one first frame disposed on the polarization beam splitter main component, with one first frame corresponding to one liquid crystal display module; the liquid crystal display module includes a display screen and a second frame fixed around the display screen; wherein the first frame and the second frame are connected to install the liquid crystal display module and the polarization beam splitter together.

[0045] For example, the first frame and the second frame are connected by dispensing adhesive.

[0046] For example, the projection device further includes a heat dissipation structure, the heat dissipation structure comprising:

[0047] A first heat dissipation module is disposed at the location of the light-emitting component; and / or,

[0048] The second heat dissipation module is located at the position of the liquid crystal display module.

[0049] For example, the first heat dissipation module includes: a first base and a first heat dissipation component. The first base is disposed on the side of the light-emitting component away from the direction of light propagation emitted by the light-emitting component. The first heat dissipation component includes a plurality of first heat dissipation fins. The first heat dissipation component is arranged on one side of the light-emitting component along at least a portion of the light path of the light-emitting component.

[0050] For example, the second heat dissipation module includes: a second base and a second heat dissipation component, the second base being disposed on the non-display side of the liquid crystal display module, and the second heat dissipation component being disposed on the non-display side of the liquid crystal display module or on one side of the polarization beam splitter.

[0051] For example, the heat dissipation structure further includes: an air duct, the air duct including an air inlet and an air outlet;

[0052] A fan is disposed in the air duct, and the fan is configured such that the refrigerant gas entering the air duct from the air inlet blows at least toward the first heat dissipation module and / or the second heat dissipation module, and the hot refrigerant gas formed after heat exchange of the refrigerant gas is discharged from the air outlet.

[0053] For example, either the first heat dissipation module or the second heat dissipation module further includes a cooling chip, wherein the cooling chip is located between the first heat dissipation module and the light-emitting component, and performs heat conduction between the first heat dissipation module and the light-emitting component, and / or, the cooling chip is located between the second heat dissipation module and the liquid crystal display module, and performs heat conduction between the second heat dissipation module and the liquid crystal display module.

[0054] In a second aspect, embodiments of this disclosure provide a projection system, including:

[0055] Projection screen; and

[0056] In the projection device described above, the projection screen is located on the light-emitting side of the projection lens and is configured to project the polarized light emitted by the projection device to form a projected image. Attached Figure Description

[0057] Figure 1 shows a schematic diagram of the optical path of a projection device in some embodiments of this disclosure;

[0058] Figure 2 shows a schematic diagram of the structure of the liquid crystal display panel in the liquid crystal display module in some embodiments of this disclosure;

[0059] Figure 3 shows the optical path principle diagram of the projection device in some embodiments of this disclosure to realize 3D projection display;

[0060] Figure 4 shows one of the schematic diagrams of the symmetrical arrangement of the display screens of the first liquid crystal display module and the second liquid crystal display module in some embodiments of this disclosure;

[0061] Figure 5 shows a second schematic diagram of the symmetrical arrangement of the display screens of the first liquid crystal display module and the second liquid crystal display module in some embodiments of this disclosure;

[0062] Figure 6 shows one of the optical path diagrams of the light-emitting components in some embodiments of this disclosure;

[0063] Figure 7 shows a second optical path diagram of the light-emitting component in some embodiments of this disclosure;

[0064] Figure 8 shows a schematic diagram of a partial sealing structure of the polarization beam splitter and the liquid crystal display module in some embodiments of this disclosure;

[0065] Figure 9 shows one of the schematic diagrams of the sealing structure;

[0066] Figure 10 shows a second schematic diagram of the sealing structure;

[0067] Figure 11 shows a schematic diagram of the fully bonded and sealed structure of the polarization beam splitter and the liquid crystal display module in some other embodiments of this disclosure;

[0068] Figure 12 shows one of the structural schematic diagrams of the polarization beam splitter and the liquid crystal display module after alignment and assembly in some embodiments of this disclosure;

[0069] Figure 13 shows a second schematic diagram of the structure after the polarization beam splitter and the liquid crystal display module are aligned and assembled in some embodiments of this disclosure;

[0070] Figure 14 shows a schematic diagram of one of the heat dissipation structures in some embodiments of this disclosure;

[0071] Figure 15 shows a second schematic diagram of the heat dissipation structure in some embodiments of this disclosure;

[0072] Figure 16 shows a third schematic diagram of the heat dissipation structure in some embodiments of this disclosure;

[0073] Figure 17 shows a fourth schematic diagram of the heat dissipation structure in some embodiments of this disclosure;

[0074] Figure 18 shows a fifth schematic diagram of the heat dissipation structure in some embodiments of this disclosure;

[0075] Figure 19 shows a sixth schematic diagram of the heat dissipation structure in some embodiments of this disclosure. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0077] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0078] The features such as "parallel," "perpendicular," and "identical" used in the embodiments of this disclosure include features in the strict sense of "parallel," "perpendicular," and "identical," as well as cases where "approximately parallel," "approximately perpendicular," and "approximately identical" include certain tolerances. Taking into account the measurement and the tolerances associated with the measurement of a specific quantity (e.g., limitations of the measurement system), they represent the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of said value.

[0079] Furthermore, throughout this document, unless otherwise defined, the terms “substantially,” “essentially,” “approximately,” and “about” are used to describe and explain small variations. When used with an event or situation, these terms can cover situations where the event or situation occurs precisely or approximately. For example, when used with a numerical value, these terms can include a range of variation of the numerical value less than or equal to 10%, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. The term “substantially coplanar” can refer to two surfaces arranged along the same plane within a micrometer range, for example, within 40 μm, 30 μm, 20 μm, 10 μm, or 1 μm.

[0080] It should be understood that, in the exemplary embodiments of this disclosure, when a layer or element is referred to as being on another layer or substrate, it may mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate. "A and B are set in the same layer" means that after A and B are formed using the same film deposition process to form a film layer for forming a specific pattern, the layer structure is formed in one patterning process using the same photomask.

[0081] Before providing a detailed description of the projection device and projection system provided in the embodiments of this disclosure, the following description of the related technologies is provided:

[0082] In related technologies, reflective projection devices mainly include the following two types: one is a spatial light modulation panel based on a DMD chip, which works by modulating the direction of light through the oscillation of tiny metal reflective sheets, thereby controlling the image display. The other is a projection device based on a reflective liquid crystal display panel, where electrodes are etched on a silicon substrate to control the deflection of liquid crystal molecules, thereby controlling the passage of light. However, the display panels of both types of projection devices are expensive, and typically require the use of three panels in the projection device.

[0083] To address the aforementioned issues, this disclosure provides a projection device and system that achieves projection display through a simple optical path, thereby reducing costs.

[0084] As shown in Figure 1, the projection device provided in this embodiment includes: a projection lens 100, a light-emitting component 200, a polarization beam splitter 300, and at least one liquid crystal display module 400.

[0085] The light emitted by the light-emitting component 200 includes at least a first initial polarized light and a second initial polarized light. The first initial polarized light has a first polarization direction, and the second initial polarized light has a second polarization direction. The first polarization direction is perpendicular to the second polarization direction.

[0086] The polarization beam splitter 300 is used to reflect the first initial polarized light to obtain reflected polarized light and allow the second initial polarized light to pass through to obtain transmitted polarized light. The reflected polarized light is perpendicular to the propagation direction of the first initial polarized light, and the transmitted polarized light is in the same propagation direction as the second initial polarized light.

[0087] At least one of the liquid crystal display modules 400 is disposed in the propagation optical path of the transmitted polarized light, and / or at least one of the liquid crystal display modules 400 is located in the propagation optical path of the reflected polarized light;

[0088] At least one of the liquid crystal display modules 400 is used to modulate the transmitted polarized light or the reflected polarized light into projected polarized light and reflect it back to the polarization beam splitter 300. The polarization beam splitter 300 is used to output the projected polarized light to the projection lens 100. The projection lens 100 is used to project the projected polarized light onto a predetermined area. The predetermined area may include, but is not limited to, a projection screen.

[0089] In the above scheme, the projection device includes a projection lens 100, a light-emitting component 200, a polarization beam splitter 300, and at least one liquid crystal display module 400. The light-emitting component 200 can emit at least a first initial polarized light and a second initial polarized light with perpendicular polarization directions. Utilizing the characteristic of the polarization beam splitter 300 to allow light with the second polarization direction to pass through while reflecting light with the first polarization direction, the first and second initial polarized lights emitted by the light-emitting component 200 can be decomposed into transmitted polarized light and reflected polarized light with different propagation directions. The liquid crystal display module 400 is provided on the propagation path of at least one of the transmitted polarized light and the reflected polarized light. Utilizing the modulation effect of the liquid crystal display module 400 on the light, projected polarized light can be formed and reflected back to the polarization beam splitter 300. The polarization beam splitter 300 then emits the projected polarized light to the projection lens 100, and the projection lens 100 projects the projected polarized light onto a predetermined area. In this way, projection display can be achieved using a simple optical path, and the projection display purpose can be achieved with a minimum of one LCD display module 400, which reduces costs compared to related technologies that require three panels for projection.

[0090] As an exemplary embodiment, as shown in FIG1, the at least one liquid crystal display module 400 includes a first liquid crystal display module LCD1 and a second liquid crystal display module LCD2. The first liquid crystal display module LCD1 is located in the propagation optical path of the transmitted polarized light, and the second liquid crystal display module LCD2 is located in the propagation optical path of the reflected polarized light; wherein,

[0091] The first liquid crystal display module LCD1 is used to modulate the transmitted polarized light into first projected polarized light with a first polarization direction and reflect it back to the polarization beam splitter 300. The polarization beam splitter 300 is also used to reflect the first projected polarized light to the projection lens 100.

[0092] The second liquid crystal display module LCD2 is used to modulate the reflected polarized light into second projected polarized light with a second polarization direction and reflect it back to the polarization beam splitter 300. The polarization beam splitter 300 is used to allow the second projected polarized light to pass through and exit to the projection lens 100.

[0093] The projection lens 100 is used to project the first projected polarized light and the second projected polarized light onto a predetermined area.

[0094] In the above scheme, by combining the beam splitting characteristics of the polarization beam splitter 300 with two liquid crystal display modules 400, the utilization rate of polarized light from the light-emitting component 200 can be improved and the brightness of the projected image can be increased compared to the scheme with only one liquid crystal display module 400.

[0095] As an exemplary embodiment, as shown in FIG1, the polarization beam splitter 300 has a polarization beam splitting surface 310, which is configured to form a preset angle θ relative to the first direction X. The first direction X is the incident direction of the first initial polarized light and the second initial polarized light onto the polarization beam splitter 300, and the first direction X is perpendicular to the principal optical axis of the projection lens 100. For example, the preset angle θ is 45°.

[0096] Using the above scheme, after the first initial polarized light is incident on the polarization beam splitter 300, the polarization beam splitter 300 reflects the first initial polarized light to obtain reflected polarized light propagating along the second direction Y. For example, when the preset angle θ is 45°, the second direction Y is perpendicular to the first direction X. After the second initial polarized light is incident on the polarization beam splitter 300, the polarization beam splitter 300 allows the second initial polarized light to pass through, obtaining transmitted polarized light propagating along the first direction X. Since the first liquid crystal display module LCD1 is located on the propagation path of the transmitted polarized light, and the second liquid crystal display module LCD2 is located on the propagation path of the reflected polarized light, when the preset angle θ is 45°, the display side of the first liquid crystal display module LCD1 and the display side of the second liquid crystal display module LCD2 are arranged perpendicularly to each other. This arrangement simplifies the optical path and facilitates the arrangement and assembly of the entire projection device.

[0097] However, it should be noted that the value of the preset angle θ is not limited to 45°. When the preset angle θ of the polarization beam splitting surface 310 of the polarization beam splitting component 300 relative to the first direction X is other than 45°, the angle between the propagation directions of the transmitted polarized light and the reflected polarized light can be calculated and determined according to the optical path principle. Based on this angle, which can be equal to the preset angle θ, the arrangement direction of the display side a of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 can be determined.

[0098] Furthermore, it should be noted that, taking the display sides a of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 as being arranged perpendicularly to each other as an example, in some embodiments, as shown in FIG4, the angle between the display side a of the first liquid crystal display module LCD1 and the polarizing beam splitting surface 310 is the first angle α, and the angle between the display side a of the second liquid crystal display module LCD2 and the polarizing beam splitting surface 310 is the second angle β. The value range of the first angle α is 30° to 60°, the value range of the second angle β is 30° to 60°, and α+β=90°.

[0099] For example, α is 45° and β is 45°.

[0100] Furthermore, the polarization beam splitter 300 can be implemented using a polarization beam splitter prism, or it can include a light-transmitting layer, such as a glass substrate, on which a polarization beam splitting film is deposited or attached. It should be understood that the specific structure of the polarization beam splitter 300 is not limited.

[0101] The polarization beam splitter 310 of the polarization beam splitter 300 has the characteristic that the reflection axis and the transmission axis are perpendicular, so that the transmitted polarized light and the reflected polarized light after being split by the polarization beam splitter 300 are perpendicular to each other. For the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2, the polarization direction of the transmitted polarized light and the reflected polarized light are modulated based on the liquid crystal deflection state. Therefore, the liquid crystal alignment (Rubbing) direction in the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 can be determined by the reflection axis of the polarization beam splitter 310 in the polarization beam splitter 300.

[0102] As an exemplary embodiment, the reflection axis angle of the polarization beam splitter 310 of the polarization beam splitter component 300 can be in the range of 0-180°. The reflection axis angle of the polarization beam splitter 310 refers to a specific angle of the polarization beam splitter 310 relative to the incident light beam.

[0103] The reflection axis angle of the polarizing beam splitter 310 can be arbitrarily adjusted according to the direction of the coating on the polarizing beam splitter 310. The angle can be determined in accordance with the pixel design and optical path requirements of the liquid crystal display module 400. For example, the reflection axis angle can be 0°, 10°, 80°, 90°, 100°, or 170°, which facilitates the pixel design in the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2.

[0104] It should be noted that the liquid crystal alignment direction can be determined by the friction direction of the alignment film in the liquid crystal display panel. A specific alignment film friction direction can only be adapted to a specific polarization direction. Taking the paper surface in the figure as a horizontal plane as an example, when the reflection axis of the polarization beam splitter 300 is 90°, that is, when the reflection axis direction is parallel to the paper surface, the incident light of the second liquid crystal display module LCD2 (i.e., the reflected polarized light) is 90° polarized light, and the liquid crystal alignment direction of the second liquid crystal display module LCD2 can be 80° or 100°; the incident light of the first liquid crystal display module LCD1 (i.e., the transmitted polarized light) is 0° polarized light, that is, the polarization direction is perpendicular to the paper surface, and the liquid crystal alignment direction of the first liquid crystal display module LCD1 can be 10° or 170°.

[0105] As an exemplary embodiment, as shown in FIG2, both the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 include a liquid crystal display panel 410.

[0106] As shown in Figure 2, the liquid crystal display panel 410 has a display side a and a non-display side b disposed opposite to each other; the liquid crystal display panel 410 includes: a first substrate 411 and a second substrate 412 disposed opposite each other; a liquid crystal layer 413 disposed between the first substrate 411 and the second substrate 412; and a reflective layer 414 disposed on the second substrate 412; wherein, the first substrate 411 is located on the side of the second substrate 412 closer to the display side a; the reflective layer 414 is disposed on the second substrate 412, and the reflective layer 414 is capable of reflecting incident light from the display side a of the liquid crystal display panel 410 back to the display side a;

[0107] The liquid crystal display panel 410 is configured to have a first state and a second state based on different deflection states of the liquid crystal layer 413.

[0108] In the first state, the liquid crystal display panel 410 can reflect incident light from the display side a of the liquid crystal display panel 410 back to the display side a to obtain reflected light, and the polarization direction of the incident light and the reflected light is perpendicular.

[0109] In the second state, the liquid crystal display panel 410 can reflect incident light from the display side a of the liquid crystal display panel 410 back to the display side a to obtain reflected light, and the polarization directions of the incident light and the reflected light are the same.

[0110] For example, in the first state, the liquid crystal display panel 410 displays an image, and in the second state, the liquid crystal display panel 410 does not display an image.

[0111] In this way, in the first state, the liquid crystal display panel 410 displays the image and modulates the polarization direction of the polarized light incident inside, and reflects it back into the polarization beam splitter 300, so that the projected polarized light enters the projection lens 100 to achieve the final projection display purpose.

[0112] In the second state, the liquid crystal display panel 410 does not display an image, and at the same time, the polarization direction of the polarized light incident inside is not modulated, and it is directly reflected back into the polarization beam splitter 300, so that the polarized light that is reflected back returns to the light-emitting element along the original path, and no projection display is performed.

[0113] As an exemplary embodiment, as shown in FIG2, the second substrate 412 includes a substrate 4121 and a pixel driving circuit layer 4122 disposed on the substrate 4121. The reflective layer 414 is disposed on the side of the pixel driving circuit layer 4122 facing away from the substrate 4121.

[0114] Using the above scheme, since the pixel driving circuit layer 4122 is generally opaque, in order to improve the light efficiency, the reflective layer 414 is arranged on the side of the pixel driving circuit layer 4122 closer to the light-emitting side, so that the polarized light incident from the display side a into the liquid crystal display panel 410 is reflected back to the display side a by the reflective layer 414 to the maximum extent. Furthermore, the reflective layer 414 is disposed on the second substrate 412, and can achieve the purpose of polarization light modulation by utilizing liquid crystal deflection.

[0115] In related technologies, projection devices can only display in black and white. There is no color filter layer on the panel. Three LCOS (Liquid Crystal on Silicon) substrates or DMD (Digital Micromirror Device) chips are required, along with beam splitting and beam combining paths, to achieve color image display.

[0116] To improve the above-mentioned problems, the liquid crystal display panel 410 can be a monochrome display panel; or, the liquid crystal display panel 410 can be a color display panel. The projection device provided in this embodiment can realize black and white projection images or color projection images.

[0117] Specifically, as shown in Figure 2, when the liquid crystal display panel 410 is a color display panel, the liquid crystal display panel 410 has at least two sub-pixels with different colors of light. The first substrate 411 is provided with a color filter layer 4111. The color filter layer 4111 includes an array of filter units 4112. Each filter unit 4112 includes at least two filter areas 4113. One filter area 4113 corresponds to at least one of the sub-pixels.

[0118] Thus, since the liquid crystal display module 400 uses a liquid crystal display panel 410, a color filter layer 4111 can be set on any liquid crystal display module 400, and normal color image display can be achieved by using one or two panels.

[0119] As an exemplary embodiment, as shown in FIG4, the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 are configured to display images symmetrically about a first axis of symmetry O; wherein, the included angle between the display sides a of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 is a third included angle α+β, and the first axis of symmetry O is the bisector of the third included angle α+β.

[0120] As shown in Figure 3, the above scheme utilizes the first and second projection polarized light rays of the first and second liquid crystal display modules, respectively. By symmetrically arranging the display images on the first and second liquid crystal display modules LCD1 and LCD2 about the first axis of symmetry O, a normal image can be projected. Specifically, when projecting a 3D image, the images for the left and right eyes of the viewer can be projected onto the first and second liquid crystal display modules LCD1 and LCD2, respectively. Thus, when the viewer wears polarized glasses 20, a 3D projection display effect can be achieved.

[0121] Specifically, as shown in Figure 4, in some exemplary embodiments, the first liquid crystal display module LCD1 has a plurality of first pixel units P1 arranged in an array, and the second liquid crystal display module LCD2 has a plurality of second pixel units P2 arranged in an array. The first pixel units P1 and the second pixel units P2 are symmetrically distributed about the first axis of symmetry O. In any pair of symmetrically distributed first pixel units P1 and second pixel units P2, the sub-pixel corresponding to the first pixel unit P1 in the first projected polarized light and the sub-pixel corresponding to the second pixel unit P2 in the second projected polarized light are transmitted through the projection lens 100 to the same pixel point on the predetermined area.

[0122] As an exemplary embodiment, the first pixel unit P1 and the second pixel unit P2 respectively include a first sub-pixel PA and a second sub-pixel PB for emitting different colors of light; wherein, in any pair of symmetrically distributed first pixel units P1 and second pixel units P2, the first sub-pixel PA in the first pixel unit P1 and the first sub-pixel PA in the second pixel unit P2 are symmetrically arranged about the first axis of symmetry O, and the second sub-pixel PB in the first pixel unit P1 and the second sub-pixel PB in the second pixel unit P2 are symmetrically arranged about the first axis of symmetry O.

[0123] In the above scheme, referring to Figure 4, taking the pixel unit P, which includes R (red) sub-pixels, B (blue) sub-pixels, and G (green) sub-pixels as an example, the R sub-pixels on the first liquid crystal display module LCD1 correspond to the R sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other. The mirror surface is the polarizing beam splitting surface 310, which is tilted at 45°. Similarly, the B sub-pixels on the first liquid crystal display module LCD1 correspond to the B sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other. The G sub-pixels on the first liquid crystal display module LCD1 correspond to the G sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other.

[0124] The principle by which the projection device in the above embodiments achieves 3D projection display is as follows:

[0125] The main pixel formed by merging three RGB sub-pixels in the first liquid crystal display module LCD1 displays the content of screen A in the 3D movie. The main pixel formed by merging three RGB sub-pixels in the second liquid crystal display module LCD2 displays the content of screen B in the 3D movie. Under the action of the polarization beam splitter 300, the light rays from the sub-pixels at corresponding mirror positions of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 will eventually merge together. However, the first and second projection polarized light, whose polarization directions are perpendicular to each other, are projected onto a pixel on the projection screen 10 through the lens. Since the polarized glasses 20 have polarizers with mutually perpendicular absorption axes attached to the left and right lenses respectively, when the user wears the polarized glasses 20, the left eye will only see one of the images in the first liquid crystal display module LCD1 or the second liquid crystal display module LCD2, while the right eye will see the other image, thus achieving a pixel-level 3D projection display effect.

[0126] As another exemplary embodiment, as shown in FIG5, the first pixel unit P1 and the second pixel unit P2 respectively include a first sub-pixel PA and a second sub-pixel PB for emitting different colors of light; wherein, in any pair of symmetrically distributed first pixel units P1 and second pixel units P2, the second sub-pixel PB in the first pixel unit P1 and the first sub-pixel PA in the second pixel unit P2 are symmetrically arranged about the first axis of symmetry O, and the first sub-pixel PA in the first pixel unit P1 and the second sub-pixel PB in the second pixel unit P2 are symmetrically arranged about the first axis of symmetry O.

[0127] In the above embodiments, referring to Figure 5, taking the pixel unit P, which includes R (red) sub-pixels, B (blue) sub-pixels, and G (green) sub-pixels, as an example, the R sub-pixels on the first liquid crystal display module LCD1 correspond to the B sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other. The mirror surface is the polarizing beam splitting surface 310, which is tilted at 45°. Similarly, the B sub-pixels on the first liquid crystal display module LCD1 correspond to the R sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other. The G sub-pixels on the first liquid crystal display module LCD1 correspond to the G sub-pixels on the second liquid crystal display module LCD2, and the two are mirror images of each other.

[0128] The principle by which the projection device in the above embodiments achieves 3D projection display is as follows:

[0129] The main pixel formed by merging three RGB sub-pixels in the first liquid crystal display module LCD1 displays the content of screen A in the 3D movie. The main pixel formed by merging three RGB sub-pixels in the second liquid crystal display module LCD2 displays the content of screen B in the 3D movie. Under the action of the polarization beam splitter 300, the final light rays of the sub-pixels at corresponding mirror positions of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 will merge together, but the first and second projection polarized light with mutually perpendicular polarization directions will be projected onto a pixel on the projection screen 10 through the projection lens 100. Since the polarized glasses 20 have polarizers with mutually perpendicular absorption axes attached to the left and right lenses respectively, when the user wears the polarized glasses 20, the left eye will only see one of the images in the first liquid crystal display module LCD1 or the second liquid crystal display module LCD2, and the right eye will see the other image, thus achieving a pixel-level 3D projection display effect.

[0130] In the above embodiments, in any pair of symmetrically distributed first pixel units P1 and second pixel units P2, although the positions of the first pixel units P1 and the second pixel units P2 are symmetrically distributed, the RGB sub-pixels can be not completely symmetrically arranged. This is because the three RGB sub-pixels in each first pixel unit P1 or second pixel unit P2 are merged into a main pixel. That is to say, the main pixel ultimately formed by the merging of the three RGB sub-pixels of any pixel unit P in the first pixel unit P1 or the second pixel unit P2 will still overlap with a single pixel on the projection screen 10, and will not affect the imaging effect. Furthermore, with this design, the liquid crystal display panels 410 of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 do not need to be designed separately in terms of pixel structure, and can adopt the same pixel array design scheme, reducing design difficulty and production cost, without affecting the projection effect.

[0131] As an exemplary embodiment, as shown in Figures 6 and 7, the light-emitting component 200 includes: a light-emitting element 210, a focusing element 220, and a collimating element 230. The diffused light emitted by the light-emitting element 210 includes light rays having at least a first polarization direction and a second polarization direction; the focusing element 220 is disposed in the optical path of the diffused light rays and is configured to converge the light rays incident on it; the collimating element 230 is disposed in the propagation path of the light rays converged by the focusing element 220 and is configured to output the light rays converged by the focusing element 220 as the first initial polarized light and the second initial polarized light.

[0132] In the above scheme, the light-emitting element consists of a light source and a collimating optical path. The light source is the light-emitting component 210, and the collimating optical path includes a focusing component 220 and a collimating component 230. The diffused light from the light-emitting component 210 is first converged and then collimated by the collimating component 230.

[0133] Specifically, as an exemplary embodiment, as shown in FIG6, the light-emitting component 210 coincides with the principal optical axis of the light-concentrating component 220 and is perpendicular to the principal optical axis of the collimating component 230. The light-emitting component 200 also includes a reflective component 240, which is disposed on the propagation path of the light after being converged by the light-concentrating component 220, and is configured to emit the light after being converged by the light-concentrating component to the collimating component 230.

[0134] For example, the tilt angle of the reflective surface of the reflective component 240 relative to the first direction X can be 30 to 60°, for example, 45°. For example, the focusing component 220 may include, but is not limited to, a total internal reflection lens (TIR lens), and the collimating component 230 may include, but is not limited to, a Fresnel lens.

[0135] Using the above scheme, the principal optical axis of the light-emitting component 210 and the principal optical axis of the collimating component 230 can be arranged perpendicularly. At this time, the propagation direction of light can be converted by setting the reflective component 240 in the optical path of the light-emitting component 210.

[0136] The light-emitting element with the above structure has the following optical path: the light emitted by the light-emitting component 210 passes through the focusing component 220, is first converged once, and then diverged by the reflecting component 240 to illuminate the collimating component 230. The light emitted from the collimating component 230 can be either a converging light or a parallel light. If the light emitted from the collimating component 230 is a converging light, the focal point of the projected polarized light formed after the converging light passes through the liquid crystal display module 400 and the polarization beam splitter 300 is at the aperture stop position or the far end of the aperture stop of the projection lens 100. If the light emitted from the collimating component 230 is a parallel light, the size of the projected polarized light formed after the parallel light passes through the liquid crystal display module 400 and the polarization beam splitter 300 needs to be smaller than the size of the aperture stop of the projection lens 100. After being emitted from the collimating component 230, the light enters the polarization beam splitter 300. After being split by the polarization beam splitter 300, the light enters the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 respectively. After being modulated by the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2, the light is reflected back to the polarization beam splitter 300. After being reflected again by the polarization beam splitter 300, the light enters the projection lens 100 to complete the projection display.

[0137] In some other exemplary embodiments, as shown in FIG7, the principal optical axis of the light-emitting component 210 coincides with the principal optical axis of the light-concentrating component 220 and the collimating component 230, and the optical path focal point of the light-concentrating component 220 coincides with the rear focal point of the collimating component 230.

[0138] Using the above scheme, in terms of spatial arrangement, the principal optical axes of the light-emitting component 210, the focusing component 220, and the collimating component 230 can be aligned. Since the optical path focal point of the focusing component 220 coincides with the back focal point of the collimating component 230, the light emitted after passing through the collimating component 230 can be collimated. The advantage of this scheme is that the light-emitting surface of the light-emitting component 210 is not limited by size and can be made relatively large.

[0139] To more clearly illustrate the embodiments of this disclosure, the following example illustrates the optical path principle of the projection device provided in this disclosure when using two liquid crystal display modules 400, in the case of a first polarization direction polarized light being P light and a second polarization direction polarized light being S light, and the polarization beam splitting surface 310 in the polarization beam splitting component 300 having a preset angle θ relative to the first direction X of 45°.

[0140] P-polarization (P-polarization) and S-polarization (S-polarization) refer to two different polarization states, commonly used to describe the behavior of light waves at interfaces (such as reflection and refraction). P-polarization can refer to parallel-polarized light, meaning the polarization direction is parallel to the plane of incidence. S-polarization refers to light waves with a polarization direction perpendicular to the plane of incidence. In reflection and refraction, the reflection and refraction characteristics of P-polarization differ from those of S-polarization. At a specific angle of incidence (Brewster's angle), the intensity of reflected P-polarization decreases to a minimum. In contrast, S-polarization behaves differently in reflection and refraction. At Brewster's angle, the intensity of reflected S-polarization does not decrease to a minimum as much as that of P-polarization.

[0141] Please refer to Figures 1, 6, and 7. The light emitted by the light-emitting component 210 can be considered as a mixture of P-rays and S-rays. After modulation by the focusing component 220 and the collimating component 230, the P-rays and S-rays are incident on the polarization beam splitter 300. The 45° angled polarization beam splitter 310 in the polarization beam splitter 300 can reflect the P-rays and transmit the S-rays. Therefore, under the action of the polarization beam splitter 300, the P-rays are reflected into the second liquid crystal display module LCD2, and the S-rays are transmitted into the reflective first liquid crystal display module LCD1. Theoretically, the P-rays and S-rays can each account for 50% of the total light emitted by the light-emitting component 210.

[0142] When the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 are configured to display an image, the polarization direction of the polarized light is rotated by 90° and reflected back to the polarization beam splitter 300. Therefore, the emitted light from the second liquid crystal display module LCD2 is S-light, and the emitted light from the first liquid crystal display module LCD1 is P-light. The S-light emitted from the second liquid crystal display module LCD2 passes through the polarization beam splitter 300 and enters the projection lens 100, while the P-light emitted from the second liquid crystal display module LCD2 is reflected by the polarization beam splitter 300 back to the projection lens 100, ultimately reaching the projection screen 10 and forming an image. Furthermore, the display images of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 are symmetrically displayed, with completely symmetrical content. Thus, when displaying a normal image, the content of the same pixel unit can overlap on the projection screen 10, and the brightness is superimposed.

[0143] When the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 are not forming an image, the polarization direction of the polarized light will not change. After the polarized light is incident on the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2, it will be directly reflected back to the polarization beam splitter 300. Therefore, the emitted light from the second liquid crystal display module LCD2 is P-light, and the emitted light from the first liquid crystal display module LCD1 is S-light. The P-light emitted from the second liquid crystal display module LCD2 is reflected by the polarization beam splitter 300 into the collimating component 230, and the S-light emitted from the first liquid crystal display module LCD1 passes through the polarization beam splitter 300 and enters the collimating component 230. Among them, the P-light and S-light returning from the polarization beam splitter 300 to the collimating component 230 gradually attenuate after multiple reflections and transmissions in the optical path.

[0144] In addition, in related technologies, the projection device has poor sealing and dust protection. Dust adhering to the display panel will affect the image and is not conducive to long-term operational stability.

[0145] As shown in Figure 8, in some exemplary embodiments, the polarization beam splitter 300 includes at least one mounting portion 320, with one mounting portion 320 corresponding to one liquid crystal display module 400. The display side a of at least one liquid crystal display module 400 faces the corresponding mounting portion 320 and is mounted on the mounting portion 320. For example, when there is only one liquid crystal display module 400, the polarization beam splitter 300 has one mounting portion 320, and the display side a of the liquid crystal display module 400 faces and is mounted on the mounting portion 320. When there are two liquid crystal display modules 400, the polarization beam splitter 300 may have two mounting portions 320 respectively, with the first liquid crystal display module LCD1 mounted on one mounting portion 320 and the second liquid crystal display module LCD2 mounted on the other mounting portion 320.

[0146] As shown in Figures 8 and 11, a sealing structure 500 is provided at least around the display side a of the liquid crystal display module 400 at the assembly gap between the liquid crystal display module 400 and the polarization beam splitter 300. By providing the sealing structure 500, the problem of poor sealing and dustproofing of the projection device can be improved, preventing dust from adhering to the liquid crystal display module 400 from the assembly gap, thereby enhancing the long-term operational stability of the projection device.

[0147] As an exemplary embodiment, as shown in FIG9, the sealing structure 500 includes a hollow area 510 and a solid area 520 located around the hollow area 510; wherein, the display side a of the liquid crystal display module 400 includes a display area AA and a peripheral area B located around the display area AA, and the sealing structure 500 is sandwiched between the display side a and the assembly part 320, and the solid area 520 is provided corresponding to the peripheral area B.

[0148] By adopting the above solution, by setting a hollow area 510 and a solid area 520 on the sealing structure 500, and only the solid area 520 is attached to the peripheral area B of the display side a of the liquid crystal display module 400, the display area AA can be completely isolated from the outside world, achieving the purpose of local sealing and dust prevention, without affecting the heat dissipation of the liquid crystal display module 400 or the image of the display area AA.

[0149] As another exemplary embodiment, as shown in FIG10, the sealing structure 500 includes a hollow area 510 and a solid area 520 located around the hollow area 510; wherein, the display side a is in contact with the assembly part 320, and the solid area 520 is arranged around the periphery of the liquid crystal display module 400 at least around the periphery to seal the gap between the display side a and the assembly part 320.

[0150] Alternatively, the sealing structure 500 can be arranged around the entire periphery of the liquid crystal display module 400 to completely isolate the display side a of the liquid crystal display module 400 from the outside world. The sealing structure 500 can also be implemented using sealing silicone or similar materials.

[0151] The sealing structure 500 can be constructed as a rectangular adhesive, such as foam frame adhesive. Alternatively, the sealing structure 500 can also be implemented using sealing silicone or similar materials.

[0152] It should be noted that the sealing structure 500 may be provided only in the peripheral area B of the display side a of the liquid crystal display module 400; or, the sealing structure 500 may be provided only on the periphery of the liquid crystal display module 400; or, the sealing structure 500 may be provided in both the peripheral area B of the display side a of the liquid crystal display module 400 and the periphery of the liquid crystal display module 400.

[0153] In addition, in some other exemplary embodiments of this disclosure, as shown in FIG11, the sealing structure 500 includes a light-transmitting layer 540 located between the display side a and the assembly part 320, and adhesive 530 is coated between the peripheral area B of the light-transmitting layer 540 and the display side a, and between the peripheral area B of the light-transmitting layer 540 and the assembly part 320.

[0154] For example, the light-transmitting layer 540 can be any suitable structure such as an optical glass substrate or an optical adhesive layer. The size of the light-transmitting layer 540 can be approximately the same as the size of the liquid crystal display module 400. The light-transmitting layer 540 is sealed to the liquid crystal display module 400 and the assembly part 320 respectively by means of adhesive 530, such as UV curing adhesive, on all four sides, thereby achieving full bonding and sealing.

[0155] In addition, during the structural assembly of the projection device, it is necessary to combine the optical path design to accurately align the polarization beam splitter 300 and the liquid crystal display module 400.

[0156] To improve alignment accuracy, in some embodiments, as shown in Figures 12 and 13, the polarization beam splitting assembly 300 includes a polarization beam splitting main component 301 and at least one first frame 302 disposed on the polarization beam splitting main component 301, with one first frame 302 corresponding to one liquid crystal display module 400; the liquid crystal display module 400 includes a display screen 401 and a second frame 402 fixed to the periphery of the display screen 401; wherein the first frame 302 and the second frame 402 are connected to mount the liquid crystal display module 400 and the polarization beam splitting assembly 300 together. For example, the first frame 302 and the second frame 402 can be connected by adhesive dispensing.

[0157] When aligning and assembling the liquid crystal display module 400 and the polarization beam splitter 300, the display screen 401 and the second frame 402 can be assembled together first, and the two can be fixed relative to each other to form the liquid crystal display module 400; then the first frame 302 and the polarization beam splitter main component 301 can be assembled together, and the two can be fixed relative to each other to form the polarization beam splitter 300; then, the polarization beam splitter 300 can be installed on the fixing fixture of the alignment machine and kept stationary, and the liquid crystal display module 400 can be fixed on the movable fixture of the alignment machine, and the liquid crystal display module 400 can be installed on the polarization beam splitter 300 using the movable fixture; then, alignment fine-tuning can be performed; after fine-tuning, adhesive can be applied and cured at several points between the first frame 302 and the second frame 402 to complete the alignment and assembly of the liquid crystal display module 400 and the polarization beam splitter 300.

[0158] It should be noted that the number of dispensing positions may include, but is not limited to, four dispensing positions, and the distribution of the dispensing positions may include, but is not limited to, the four corners of the first frame 302 and the second frame 402. The number and specific distribution of the dispensing positions are not limited as long as they are fixed after dispensing.

[0159] Furthermore, please refer to Figure 12, which shows a schematic diagram of the assembly of the liquid crystal display module 400 and the polarization beam splitter 300 in an embodiment including only one liquid crystal display module 400; and Figure 13, which shows a schematic diagram of the assembly of the liquid crystal display module 400 and the polarization beam splitter 300 in an embodiment including two liquid crystal display modules 400. When there are two liquid crystal display modules 400, during assembly, before the second frame 402 of one liquid crystal display module 400 is aligned with the first frame 302 and the adhesive is applied and cured, the other liquid crystal display module 400 can be aligned and assembled in the same manner using another movable fixture. After fine-tuning the alignment of the two liquid crystal display modules 400, adhesive is applied and cured uniformly. However, this is not a limitation.

[0160] Furthermore, in related technologies, projection devices often suffer from poor heat dissipation capabilities, leading to poor operational stability. To address this issue, in some embodiments of this disclosure, as shown in Figures 14 to 19, the projection device may further include a heat dissipation structure 700. The heat dissipation structure 700 may include a first heat dissipation module 710, which is located at the position of the light-emitting component 200 for heat dissipation; or, the heat dissipation structure 700 may include a second heat dissipation module 720, which is located at the position of the liquid crystal display module 400 for heat dissipation; or, the heat dissipation structure 700 may include a first heat dissipation module 710 and a second heat dissipation module 720, where the first heat dissipation module 710 is located at the position of the light-emitting component 200 for heat dissipation, and the second heat dissipation module 720 is located at the position of the liquid crystal display module 400 for heat dissipation. This improves the heat dissipation capability of the projection device.

[0161] As an exemplary embodiment, as shown in FIG15, the second heat dissipation module 720 includes: a second base 721 and a second heat dissipation component 722. The second base 721 is disposed on the non-display side b of the liquid crystal display module 400, and the second heat dissipation component 722 is disposed on the non-display side b of the liquid crystal display module 400 or on one side of the polarization beam splitter 300.

[0162] By adopting the above solution, since the liquid crystal display module 400 images on the display surface, the liquid crystal display module 400 can be cooled by setting the second heat dissipation module 720 on the non-display side b of the liquid crystal display module 400.

[0163] For example, the heat dissipation structure 700 may further include a cooling chip 730, which is located between the second heat dissipation module 720 and the liquid crystal display module 400, and conducts heat between the second heat dissipation module 720 and the liquid crystal display module 400.

[0164] In the above solution, a cooling chip 730, such as a TEC (thermal energy dissipation device), is provided on the non-display side b of the liquid crystal display module 400. The space between the non-display side b of the liquid crystal display module 400 and the cooling chip 730 is filled with a thermally conductive medium such as thermally conductive adhesive, thermally conductive pad, or thermally conductive plate. On the side of the cooling chip 730 facing away from the liquid crystal display module 400, the second heat dissipation module 720 can be attached and bonded with a thermally conductive medium such as thermally conductive adhesive, thermally conductive pad, or thermally conductive plate, thereby improving the heat dissipation capability of the liquid crystal display module 400.

[0165] It should be noted that in some embodiments, the cooling chip 730 may be disposed between the second heat dissipation module 720 and the non-display side b of the liquid crystal display module 400; in other embodiments, the cooling chip 730 may not be disposed, and the second heat dissipation module 720 may be directly bonded to the non-display side b of the liquid crystal display module 400 through a thermally conductive medium, which can also achieve the purpose of heat dissipation.

[0166] When the cooling chip 730 is placed between the second heat dissipation module 720 and the non-display side b of the liquid crystal display module 400, the heat dissipation efficiency can be improved, but the cost will increase. In practical applications, whether or not to place the cooling chip 730 can be reasonably selected according to actual needs.

[0167] Furthermore, for example, the second heat dissipation component 722 may include a second fin heat dissipation structure 7220, which may be made of a metal with good heat dissipation performance, such as aluminum or copper. For example, the second fin heat dissipation structure 7220 may include, but is not limited to, copper pipes or aluminum extruded heat sinks. The area and number of heat sinks of the second fin heat dissipation structure 7220 may be adjusted according to the power and volume requirements of the liquid crystal display module 400. For example, the number of copper pipes or aluminum extruded heat sinks may be 1 to 4, but is not limited thereto.

[0168] Furthermore, in terms of spatial arrangement, please refer to Figure 15. The second base 721 can be attached to the non-display side b of the liquid crystal display module 400, while the second heat dissipation component 722 can be disposed on the non-display side b of the liquid crystal display module 400 or on one side of the polarization beam splitter 300.

[0169] Specifically, taking the polarization beam splitter 300, which includes an upper surface 300a, a lower surface 300b, and six sides 300c, as an example, the liquid crystal display module 400 can be disposed on one side 300c of the polarization beam splitter 300, and the second heat dissipation component 722 can be disposed on one side of the lower surface 300b of the polarization beam splitter 300. This allows for a more compact spatial structure of the entire projection device. It is understood that the specific location of the second heat dissipation component 722 is not limited to this.

[0170] Furthermore, for a projection device that includes only one liquid crystal display module 400, only one second heat dissipation module 720 can be provided, which allows for a larger arrangement space; while for a projection device that includes two liquid crystal display modules 400, two second heat dissipation modules 720 can be provided, and the spatial arrangement needs to avoid interference between the two second heat dissipation modules 720.

[0171] In some embodiments, as shown in FIG14, taking the polarization beam splitter 300 including an upper surface 300a, a lower surface 300b, and six sides 300c as an example, the first liquid crystal display module LCD1 can be disposed on the first side 300c1 of the polarization beam splitter 300, the second liquid crystal display module LCD2 can be disposed on the second side 300c2 of the polarization beam splitter 300, and two second heat dissipation components 722 can be disposed side by side on one side of the lower surface 300b of the polarization beam splitter, with one second heat dissipation component 722 located directly below the lower surface 300b of the polarization beam splitter, and the other second heat dissipation component 722 located below the lower surface 300b of the polarization beam splitter and offset toward the side where the first side 300c1 is located.

[0172] In this way, since the first side 300c1 is also provided with a second liquid crystal display module LCD2 and a second base 721, the space below the second liquid crystal display module LCD2 and the second base 721 provided on the first side 300c1 can be fully utilized to arrange the second heat dissipation component 722, resulting in a more compact structure and helping to reduce the overall size of the machine.

[0173] It is understood that the above is only an example, and in actual applications, the specific arrangement of the second heat dissipation module 720 is not limited to this.

[0174] Furthermore, in some exemplary embodiments of this disclosure, as shown in FIG15, the first heat dissipation module 710 includes: a first base 711 and a first heat dissipation component 712. The first base 711 is disposed on the side of the light-emitting component 200 away from the light propagation direction emitted by the light-emitting component 200, and the first heat dissipation component 712 is arranged on one side of the light-emitting component 200 along at least a portion of the light path of the light-emitting component 200.

[0175] In some embodiments, as shown in FIG15, taking the polarization beam splitter 300 including an upper surface 300a, a lower surface 300b, and six side surfaces 300c as an example, the light-emitting component 200 may be disposed on one side surface 300c of the polarization beam splitter 300, and the first heat dissipation component 712 may be disposed on the side where the lower surface 300b of the polarization beam splitter is located, and arranged along the optical path of the light-emitting component 200. For example, as shown in the figure, the first heat dissipation component 712 and the second heat dissipation component 722 are arranged side by side.

[0176] In other embodiments, as shown in Figure 15, taking the polarization beam splitter 300, which includes upper and lower surfaces 300b and six sides 300c, as an example, at least one liquid crystal display module 400 can be disposed on the first side 300c1 of the polarization beam splitter 300, the light-emitting component 200 can be disposed on the second side 300c2 of the polarization beam splitter 300, the second heat dissipation component 722 can be disposed on the non-display side b of the liquid crystal display module 400, and the first heat dissipation component 712 can be located on the side of the polarization beam splitter corresponding to the first side 300c1. This allows for a more compact spatial structure of the entire projection device. It is understood that the specific location of the first heat dissipation component 712 is not limited to this.

[0177] For example, the heat dissipation structure 700 may further include a cooling chip 730, which is located between the first heat dissipation module 710 and the light-emitting component 200, and conducts heat between the first heat dissipation module 710 and the light-emitting component 200.

[0178] In the above solution, a cooling chip 730, such as a TEC (thermal energy storage device 730), is provided on the side of the light-emitting component 200 away from its emitted light. The cooling chip 730 and the side of the light-emitting component 200 away from its emitted light can be filled with a thermally conductive medium such as thermally conductive adhesive, thermally conductive pad, or thermally conductive plate. The second heat dissipation module 720 can be attached and bonded to the side of the cooling chip 730 away from the light-emitting component 200 using a thermally conductive medium such as thermally conductive adhesive, thermally conductive pad, or thermally conductive plate. This improves the heat dissipation capacity of the light-emitting component 200.

[0179] It should be noted that in some embodiments, the cooling chip 730 may be provided between the first heat dissipation module 710 and the light-emitting component 200; in other embodiments, the cooling chip 730 may not be provided, and the first heat dissipation module 710 may be directly bonded to the light-emitting component 200 through a thermally conductive medium, which can also achieve the purpose of heat dissipation.

[0180] When the cooling chip 730 is placed between the first heat dissipation module 710 and the light-emitting component 200, the heat dissipation efficiency can be improved, but the cost will increase. In practical applications, whether or not to place the cooling chip 730 can be reasonably selected according to actual needs.

[0181] Furthermore, for example, the first heat dissipation component 712 may include a first fin heat dissipation structure 7120, which may be made of a metal with good heat dissipation performance, such as aluminum or copper. For example, the first fin heat dissipation structure 7120 may include, but is not limited to, copper pipes or aluminum extruded heat sinks. The area and number of heat sinks of the first fin heat dissipation structure 7120 may be adjusted according to the power and volume requirements of the liquid crystal display module 400. For example, the number of copper pipes or aluminum extruded heat sinks may be 1 to 4, but is not limited thereto.

[0182] Furthermore, in terms of spatial arrangement, please refer to Figure 15. The first base 711 can be attached to the light-emitting component 200, and the first heat dissipation component 712 can be disposed on the side of the light-emitting component 200 away from its emitted light, or arranged along the light path of the light-emitting component 200.

[0183] It should be noted that Figure 14 shows a schematic diagram of the arrangement of the second heat dissipation module 720 when the projection device includes two liquid crystal display modules 400; Figure 15 shows a schematic diagram of the arrangement of the second heat dissipation module 720 when the projection device includes one liquid crystal display module 400.

[0184] In addition, as shown in Figure 15, in some embodiments, the heat dissipation structure 700 further includes at least one fan 740, which can be directed toward the first heat dissipation component 712 and / or the second heat dissipation component 722 to further improve heat dissipation capacity.

[0185] For example, as shown in Figure 15, there may be two fans 740, one fan 740 for blowing directly on the first heat dissipation component 712, and the other fan 740 for blowing directly on the second heat dissipation component 722.

[0186] In addition, for the overall structure of the projection device, in order to protect and prevent dust from each component, the projection device may include a housing 800, and the light-emitting component 200, the projection lens 100, the liquid crystal display module 400 and the polarization beam splitter 300 may be housed inside the housing 800.

[0187] As exemplarily shown in Figure 16, the heat dissipation structure 700 further includes an air duct 810, which includes an air inlet 811 and an air outlet 812. The air inlet 811 and the air outlet 812 may be disposed on the housing 800, and the fan 740 may be disposed in the air duct 810.

[0188] In some embodiments, as shown in FIG16, the fan 740 is disposed in the air duct 810, and the fan 740 is configured such that the refrigerant gas entering the air duct 810 from the air inlet 811 blows at least toward the first heat dissipation module 710 and / or the second heat dissipation module 720, and the hot refrigerant gas formed after heat exchange of the refrigerant gas is discharged from the air outlet 812.

[0189] For example, the fan 740 may be a centrifugal fan. Please refer to Figure 16, where arrows indicate the airflow direction. External refrigerant gas can enter the housing 800 through the air inlet 811 under the action of the fan 740, forming airflow in the air duct 810. The air inlet of the fan 740 faces the air duct 810, and the air outlet of the fan 740 faces the first heat dissipation module 710 and / or the second heat dissipation module 720, so as to blow the refrigerant gas towards the first heat dissipation module 710 and / or the second heat dissipation module 720, causing the refrigerant gas to exchange heat and form hot refrigerant gas, which is then discharged from the air outlet 812.

[0190] For example, as shown in Figure 16, the air inlet 811 and the air outlet 812 are located on opposite sides inside the housing 800. The air inlet 811 is located on the side where the fan 740 is located, and the air outlet 812 is located on the side where the liquid crystal display module 400 is located. An air duct 810 is formed between the air inlet 811 and the air outlet 812. The air inlet of the fan 740 faces the air duct 810, and the air outlet 812 of the fan 740 faces the first heat dissipation component 712 and the second heat dissipation component 722. The airflow direction is shown by the arrow in the figure. The refrigerant gas entering the housing 800 from the air inlet 811 is blown by the fan 740 towards the first heat dissipation component 712 and the second heat dissipation component 722, and then discharged from the air outlet 812.

[0191] For example, as shown in Figure 16, a partition 820 may also be provided on the air duct 810 between the air inlet 811 and the air outlet 812, the partition 820 being used to prevent backflow.

[0192] Furthermore, in some embodiments, as shown in Figures 16 and 17, the housing 800 is constructed to include several circumferential side surfaces 801, a top surface 802, and a bottom surface 803. The first heat dissipation component 712 and the second heat dissipation component 722 are arranged between the polarization beam splitter 300 and the bottom surface 803. The bottom surface 803 is constructed to include a bottom plane 8031 ​​parallel to the top surface 802, and a first inclined bottom surface 8032 and a second inclined bottom surface 8033 inclined relative to the bottom plane 8031 ​​and located on opposite sides of the bottom plane 8031. The air inlet 811 is located on the first inclined bottom surface 8032, and the air outlet 812 is located on the second inclined bottom surface 8033. This configuration is beneficial for the overall appearance design of the machine.

[0193] Furthermore, in some other embodiments, as shown in Figures 16 and 18, the housing 800 is constructed to include a plurality of circumferential side surfaces 801, a top surface 802, and a bottom surface 803. The plurality of circumferential side surfaces include a first circumferential side surface, with the first heat dissipation component 712 and the second heat dissipation component 722 arranged between the polarization beam splitter 300 and the first circumferential side surface. The bottom surface 803 has an air inlet 811, and the first circumferential side surface is constructed to form a rounded corner structure 804 with the bottom surface 803. The top surface 802 has an air outlet 812. The bottom surface 803, the rounded corner structure 804, and the first circumferential side surface cooperate to form an air duct 810. Refrigerant gas entering the housing 800 from the air inlet 811 is blown towards the first heat dissipation component 712 and the second heat dissipation component 722 by the fan 740 for heat dissipation.

[0194] It should be understood that the above is only an exemplary description of the overall structural arrangement of the projection device, and is not limited thereto. In practical applications, the overall structure of the projection device can be designed based on actual needs.

[0195] Please refer to Figures 18 and 19 for the arrangement of the air duct 810 and the fan 740 when the projection device includes only one liquid crystal display module 400 (referred to as a single-panel projection device); please refer to Figure 17 for the arrangement of the air duct 810 and the fan 740 when the projection device includes two liquid crystal display modules 400 (referred to as a dual-panel projection device). Regardless of whether it is a single-panel or dual-panel projection device, the layout of the air duct 810 and the arrangement of the fan 740 are generally the same in terms of the overall structure.

[0196] Furthermore, for dual-panel projection devices, the two second heat dissipation components 722 corresponding to the two liquid crystal display modules 400 can share one fan 740 for heat dissipation, or they can each be provided with a separate fan 740 for heat dissipation. The number of fans 740 is not limited.

[0197] In addition, the above description addresses the heat dissipation of the liquid crystal display module 400 and the light-emitting component 200. In other embodiments, heat dissipation can also be applied to optical components in the optical path of the projection device, such as the polarization beam splitter 300 and the projection lens 100, to further improve the overall heat dissipation capacity.

[0198] For example, the optical components in the optical path of the projection device can be cooled by air. For instance, as shown in Figure 19, a hollow pipe 840 is provided inside the housing 800. This pipe 840 has a first air outlet 841 and several second air outlets 842. A fan 740 is connected to either the first air outlet 841 or any of the second air outlets 842. The air blown by the fan 740 is divided into several airflows by the several second air outlets 842. The number of second air outlets 842 depends on the number of optical components in the optical path requiring cooling. The airflow can pass through the corresponding optical components to dissipate heat.

[0199] In some embodiments, after passing through the optical device, the airflow can also flow out from the first air outlet 841 in another direction of the pipe 840, pass through the first heat dissipation module 710 provided on the light-emitting component 200, and then be discharged to the outside through the air outlet 812 of the whole machine.

[0200] In the above scheme, the gas that dissipates heat from the optical components in the projection device can simultaneously dissipate heat from the first heat dissipation module 710 on the light-emitting component 200, thereby playing a superimposed heat dissipation role and effectively improving heat dissipation efficiency.

[0201] Heat dissipation simulation was performed on the projection device in some embodiments of this disclosure. The specific heat dissipation power distribution ratio is shown in Table 1:

[0202] Table 1

[0203] Using simulation software, based on the temperature distribution of each area of ​​the LCD module, it can be seen that the highest temperature on the LCD module 400 is 81℃, which meets the heat dissipation requirements.

[0204] Furthermore, this disclosure provides a projection system, including: a projection screen 10; and a projection device provided in this disclosure, wherein the projection screen 10 is located on the light-emitting side of the projection lens 100 and is configured to project the polarized light emitted by the projection device to form a projected image.

[0205] Obviously, the projection system provided in this embodiment also has the beneficial effects of the projection device provided in this embodiment, and will not be described in detail here.

[0206] The following points need to be explained:

[0207] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0208] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present disclosure, i.e., these drawings are not drawn to actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0209] (3) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0210] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A projection device, characterized in that, include: Projection lens; A light-emitting component for emitting a first initial polarized light and a second initial polarized light, wherein the first initial polarized light has a first polarization direction and the second initial polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction. A polarization beam splitter is used to reflect the first initial polarized light to obtain reflected polarized light and allow the second initial polarized light to pass through to obtain transmitted polarized light. The reflected polarized light is perpendicular to the propagation direction of the first initial polarized light, and the transmitted polarized light is in the same propagation direction as the second initial polarized light. At least one liquid crystal display module is disposed on the propagation optical path of the transmitted polarized light, and / or, at least one liquid crystal display module is located on the propagation optical path of the reflected polarized light; wherein, At least one of the liquid crystal display modules is used to modulate the transmitted polarized light or the reflected polarized light into projected polarized light and reflect it back to the polarization beam splitter, the polarization beam splitter is used to emit the projected polarized light to the projection lens; the projection lens is used to project the projected polarized light onto a predetermined area.

2. The projection device according to claim 1, characterized in that, The at least one liquid crystal display module includes a first liquid crystal display module and a second liquid crystal display module, wherein the first liquid crystal display module is located on the propagation optical path of the transmitted polarized light, and the second liquid crystal display module is located on the propagation optical path of the reflected polarized light; The first liquid crystal display module is used to modulate the transmitted polarized light into first projected polarized light with a first polarization direction and reflect it back to the polarization beam splitter. The polarization beam splitter is also used to reflect the first projected polarized light to the projection lens. The second liquid crystal display module is used to modulate the reflected polarized light into second projected polarized light with a second polarization direction and reflect it back to the polarization beam splitter. The polarization beam splitter is used to allow the second projected polarized light to pass through and exit to the projection lens. The projection lens is used to project the first projected polarized light and the second projected polarized light onto a predetermined area.

3. The projection device according to claim 2, characterized in that, Both the first liquid crystal display module and the second liquid crystal display module include a liquid crystal display panel; the liquid crystal display panel has a display side and a non-display side disposed opposite to each other, and the liquid crystal display panel includes: A first substrate and a second substrate are disposed on a box, wherein the first substrate is located on the side of the second substrate closer to the display side; A liquid crystal layer disposed between the first substrate and the second substrate; and A reflective layer is disposed on the second substrate, and the reflective layer is capable of reflecting incident light from the display side of the liquid crystal display panel back to the display side; wherein, The liquid crystal display panel is configured to have a first state and a second state based on different deflection states of the liquid crystal layer. In the first state, the liquid crystal display panel can reflect incident light from the display side of the liquid crystal display panel back to the display side to obtain reflected light, and the polarization direction of the incident light and the reflected light is perpendicular. In the second state, the liquid crystal display panel can reflect incident light from the display side of the liquid crystal display panel back to the display side to obtain reflected light, and the polarization direction of the incident light and the reflected light is the same.

4. The projection device according to claim 3, characterized in that, The liquid crystal display panel is a monochrome display panel; or, the liquid crystal display panel is a color display panel, wherein the liquid crystal display panel has a plurality of pixel units distributed in an array, each pixel unit includes at least two sub-pixels that emit different colors of light, the first substrate is provided with a color filter layer, the color filter layer includes an array of filter units, each filter unit includes at least two filter areas, and one filter area corresponds to at least one of the sub-pixels.

5. The projection device according to claim 3, characterized in that, The second substrate includes a substrate and a pixel driving circuit layer disposed on the substrate, wherein the reflective layer is disposed on the side of the pixel driving circuit layer opposite to the substrate.

6. The projection device according to claim 2, characterized in that, The polarization beam splitter has a polarization beam splitter surface, which is configured to be at a preset angle relative to a first direction. The first direction is the incident direction of the first initial polarized light and the second initial polarized light onto the polarization beam splitter, and the first direction is perpendicular to the main optical axis of the projection lens.

7. The projection device according to claim 6, characterized in that, The preset angle is 45°.

8. The projection device according to claim 6, characterized in that, The reflection axis angle of the polarization beam splitter ranges from 0 to 180°.

9. The projection device according to claim 6, characterized in that, The angle between the display side of the first liquid crystal display module and the polarization beam splitter is the first angle α, and the angle between the display side of the second liquid crystal display module and the polarization beam splitter is the second angle β. The first angle α ranges from 30° to 60°, the second angle β ranges from 30° to 60°, and α + β = 90°.

10. The projection device according to claim 2, characterized in that, The first liquid crystal display module and the second liquid crystal display module are configured to display images symmetrically about a first axis of symmetry; wherein, the angle between the display sides of the first liquid crystal display module and the second liquid crystal display module is a third angle, and the first axis of symmetry is the bisector of the third angle.

11. The projection device according to claim 10, characterized in that, The first liquid crystal display module has a plurality of first pixel units arranged in an array, and the second liquid crystal display module has a plurality of second pixel units arranged in an array. The first pixel units and the second pixel units are symmetrically distributed about the first axis of symmetry. In any pair of symmetrically distributed first pixel units and second pixel units, the sub-pixel corresponding to the first pixel unit in the first projected polarized light and the sub-pixel corresponding to the second pixel unit in the second projected polarized light are transmitted through the projection lens to the same pixel point on the predetermined area.

12. The projection device according to claim 11, characterized in that, The first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting different colors of light. In any pair of symmetrically distributed first pixel units and second pixel units, The first sub-pixel in the first pixel unit and the first sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry, and the second sub-pixel in the first pixel unit and the second sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry.

13. The projection device according to claim 11, characterized in that, The first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting different colors of light. In any pair of symmetrically distributed first pixel units and second pixel units, the second sub-pixel in the first pixel unit and the first sub-pixel in the second pixel unit are arranged symmetrically about the first axis of symmetry.

14. The projection device according to claim 2, characterized in that, The light-emitting component includes: A light-emitting component, wherein the diffused light emitted by the light-emitting component includes light rays having a first polarization direction and a second polarization direction; A light-concentrating component is disposed in the optical path of the diffused light, and the light-concentrating component is configured to converge the light incident on the light-concentrating component; A collimating component is disposed on the propagation path of the light rays converged by the focusing component. The collimating component is configured to output collimated light rays after the light rays converged by the focusing component, and the collimated light rays include the first initial polarized light and the second initial polarized light.

15. The projection device according to claim 14, characterized in that, The principal optical axis of the light-emitting component coincides with the principal optical axes of the focusing component and the collimating component, and the optical path focal point of the focusing component coincides with the rear focal point of the collimating component; or, The light-emitting component coincides with the main optical axis of the light-concentrating component and is perpendicular to the main optical axis of the collimating component. The light-emitting component also includes a reflective component, which is disposed on the propagation path of the light after it has been converged by the light-concentrating component. The reflective component is configured to emit the light after it has been converged by the light-concentrating component to the collimating component.

16. The projection device according to claim 14, characterized in that, The focusing component includes a total internal reflection lens, and the collimating component includes a Fresnel lens.

17. The projection device according to claim 1, characterized in that, The polarization beam splitter includes at least one assembly part, and one assembly part corresponds to one liquid crystal display module; at least one liquid crystal display module is mounted on the corresponding assembly part with its display side facing the assembly part, and a sealing structure is provided at least around the display side periphery of the liquid crystal display module at the assembly gap between the liquid crystal display module and the polarization beam splitter.

18. The projection device according to claim 17, characterized in that, The sealing structure includes a hollow area and a solid area located around the hollow area; The display side of the liquid crystal display module includes a display area and a peripheral area located around the display area, and the sealing structure is sandwiched between the display side and the assembly part, with the solid area corresponding to the peripheral area; and / or, the display side contacts the assembly part, and the solid area is arranged around the periphery of the liquid crystal display module at least once to seal the gap between the display side and the assembly part.

19. The projection device according to claim 18, characterized in that, The sealing structure includes at least one of foam frame adhesive and sealing silicone.

20. The projection device according to claim 17, characterized in that, The sealing structure includes a light-transmitting layer located between the display side and the assembly part, and adhesive is applied between the peripheral area of ​​the light-transmitting layer and the display side, and between the peripheral area of ​​the light-transmitting layer and the assembly part.

21. The projection device according to claim 1, characterized in that, The polarization beam splitter includes a polarization beam splitter main component and at least one first frame disposed on the polarization beam splitter main component, with one first frame corresponding to one liquid crystal display module; the liquid crystal display module includes a display screen and a second frame fixed around the display screen; wherein the first frame and the second frame are connected to install the liquid crystal display module and the polarization beam splitter together.

22. The projection device according to claim 21, characterized in that, The first frame and the second frame are connected by dispensing adhesive.

23. The projection device according to claim 1, characterized in that, The projection device further includes a heat dissipation structure, which includes: A first heat dissipation module is disposed at the location of the light-emitting component; and / or, The second heat dissipation module is located at the position of the liquid crystal display module.

24. The projection device according to claim 23, characterized in that, The first heat dissipation module includes a first base and a first heat dissipation component. The first base is disposed on the side of the light-emitting component away from the direction of light propagation emitted by the light-emitting component. The first heat dissipation component includes a plurality of first heat dissipation fins. The first heat dissipation component is arranged on one side of the light-emitting component along at least a portion of the light path of the light-emitting component.

25. The projection device according to claim 23, characterized in that, The second heat dissipation module includes: a second base and a second heat dissipation component. The second base is disposed on the non-display side of the liquid crystal display module, and the second heat dissipation component is disposed on the non-display side of the liquid crystal display module or on one side of the polarization beam splitter.

26. The projection device according to claim 23, characterized in that, The heat dissipation structure further includes an air duct, which includes an air inlet and an air outlet. A fan is disposed in the air duct, and the fan is configured such that the refrigerant gas entering the air duct from the air inlet blows at least toward the first heat dissipation module and / or the second heat dissipation module, and the hot refrigerant gas formed after heat exchange of the refrigerant gas is discharged from the air outlet.

27. The projection device according to claim 23, characterized in that, The first heat dissipation module and the second heat dissipation module further include a cooling chip, wherein the cooling chip is located between the first heat dissipation module and the light-emitting component, and performs heat conduction between the first heat dissipation module and the light-emitting component, and / or the cooling chip is located between the second heat dissipation module and the liquid crystal display module, and performs heat conduction between the second heat dissipation module and the liquid crystal display module.

28. A projection system, characterized in that, include: Projection screen; as well as The projection device according to any one of claims 1 to 27, wherein the projection screen is located on the light-emitting side of the projection lens and is configured to project the polarized light emitted by the projection device to form a projected image.

Images