Projection device and projection system

Abstract

The utility model provides a projection device and a projection system. The projection device comprises a projection lens; the light-emitting assembly is used for emitting first initial polarized light and second initial polarized light, and the polarization directions of the first initial polarized light and the second initial polarized light are perpendicular; the polarization light splitting assembly is used for reflecting the first initial polarized light to obtain reflected polarized light and allowing the second initial polarized light to penetrate to obtain transmitted polarized light; the at least one liquid crystal display module is arranged on the propagation light path of the transmission polarized light, and / or the at least one liquid crystal display module is located on the propagation light path of the reflection polarized light; the at least one liquid crystal display module is used for modulating the transmission polarized light or the reflection polarized light into projection polarized light and reflecting the projection polarized light back to the polarization light splitting assembly, and the polarization light splitting assembly is used for emitting the projection polarized light to the projection lens; the projection lens is used for projecting the projection polarized light to a predetermined area. The projection device and the projection system provided by the utility model are simple in light path.

Description

Technical Field

[0001] The present disclosure relates to, but is not limited to, the field of display technology, and in particular to a projection device and a projection system. Background Art

[0002] With the rapid development of smart projection in recent years, the projection system has attracted more and more attention due to its excellent image presentation and wide application potential. Utility Model Content

[0003] The embodiments of the present disclosure provide a projection device and a projection system, which realize projection display through a simple optical path.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] In a first aspect, an embodiment of the present disclosure provides a projection device, comprising:

[0006] projection lens;

[0007] A light-emitting component, configured to emit a first initial polarized light and a second initial polarized light, wherein the first initial polarized light has a first polarization direction, the second initial polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction;

[0008] a polarization splitter component, 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, wherein the reflected polarized light has a propagation direction perpendicular to that of the first initial polarized light, and the transmitted polarized light has a propagation direction identical to that of the second initial polarized light; and

[0009] At least one liquid crystal display module, at least one of the liquid crystal display modules is disposed on the propagation path of the transmitted polarized light, and / or at least one of the liquid crystal display modules is located on the propagation path of the reflected polarized light;

[0010] Among them, 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 splitting component, and the polarization splitting component is used to emit the projected polarized light to the projection lens; the projection lens is used to project the projected polarized light to a predetermined area.

[0011] Exemplarily, the at least one liquid crystal display module includes a first liquid crystal display module and a second liquid crystal display module, the first liquid crystal display module is located on the propagation path of the transmitted polarized light, and the second liquid crystal display module is located on the propagation path of the reflected polarized light;

[0012] The first liquid crystal display module is used to modulate the transmitted polarized light into a first projected polarized light with a first polarization direction, and reflect it back to the polarization splitting component. The polarization splitting component 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 a second projected polarized light with a second polarization direction, and reflect it back to the polarization splitting component. The polarization splitting component is used to allow the second projected polarized light to pass through and be emitted to the projection lens. The projection lens is used to project the first projected polarized light and the second projected polarized light to a predetermined area.

[0013] Exemplarily, the first liquid crystal display module and the second liquid crystal display module each 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:

[0014] A first substrate and a second substrate are arranged in a cell, wherein the first substrate is located on a side of the second substrate close to the display side;

[0015] a liquid crystal layer disposed between the first substrate and the second substrate; and

[0016] A reflective layer, the reflective layer being provided on the second substrate and capable of reflecting incident light from the display side of the liquid crystal display panel back to the display side; wherein,

[0017] 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 is perpendicular to that of the reflected light; 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 is the same as that of the reflected light.

[0018] Exemplarily, 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 of the pixel units includes at least two sub-pixels emitting light of different colors, a color filter layer is provided on the first substrate, the color filter layer includes filter units distributed in an array, each of the filter units includes at least two filter areas, and one filter area corresponds to at least one sub-pixel setting.

[0019] Exemplarily, the second substrate includes a base substrate and a pixel driving circuit layer provided on the base substrate, wherein the reflective layer is provided on a side of the pixel driving circuit layer away from the base substrate.

[0020] Exemplarily, the polarization splitting component has a polarization splitting surface, which is configured to have 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 incident on the polarization splitting component, and the first direction is perpendicular to the main optical axis of the projection lens.

[0021] Exemplarily, the preset angle is 45°.

[0022] Exemplarily, the reflection axis angle of the polarization splitting surface ranges from 0° to 180°.

[0023] Exemplarily, the angle between the display side of the first liquid crystal display module and the polarization splitting plane is a first angle α, and the angle between the display side of the second liquid crystal display module and the polarization splitting plane is a second angle β, wherein the first angle α has a value range of 30° to 60°, the second angle β has a value range of 30° to 60°, and α+β=90°.

[0024] Exemplarily, the first liquid crystal display module and the second liquid crystal display module are configured to display images symmetrically about a first symmetry axis; 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 symmetry axis is the bisector of the third angle.

[0025] Exemplarily, the first liquid crystal display module has a plurality of first pixel units distributed in an array, and the second liquid crystal display module has a plurality of second pixel units distributed in an array, and the first pixel units and the second pixel units are symmetrically distributed one by one about the first symmetry axis; 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.

[0026] Exemplarily, the first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting light of different colors.

[0027] Among them, in any pair of symmetrically distributed first pixel units and second pixel units,

[0028] The first subpixel in the first pixel unit and the first subpixel in the second pixel unit are symmetrically arranged about the first symmetry axis, and the second subpixel in the first pixel unit and the second subpixel in the second pixel unit are symmetrically arranged about the first symmetry axis.

[0029] Exemplarily, the first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting light of different colors, 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 symmetrically arranged about the first symmetry axis, and the first sub-pixel in the first pixel unit and the second sub-pixel in the second pixel unit are symmetrically arranged about the first symmetry axis.

[0030] Exemplarily, the light emitting component includes:

[0031] a light-emitting component, wherein the diffused light emitted by the light-emitting component includes at least light with a first polarization direction and a second polarization direction;

[0032] a light-converging component disposed on the optical path of the diffused light, the light-converging component being configured to converge the light incident on the light-converging component;

[0033] The collimating component is provided on a propagation path of the light focused by the focusing component, and is configured to emit the light focused by the focusing component into collimated light, wherein the collimated light includes the first initial polarized light and the second initial polarized light.

[0034] Exemplarily, the main optical axis of the light-emitting component coincides with the main optical axes of the light-collecting component and the collimating component, and the optical path focus of the light-collecting component coincides with the back focus of the collimating component; or,

[0035] The light-emitting component coincides with the main optical axis of the light-collecting component and is perpendicular to the main optical axis of the collimating component. The light-emitting component also includes a reflecting component, which is arranged on the propagation path of the light after being converged by the light-collecting component, and the reflecting component is configured to emit the light after being converged by the light-collecting component to the collimating component.

[0036] Exemplarily, the focusing component includes a total internal reflection lens, and the collimating component includes a Fresnel lens.

[0037] Exemplarily, the polarization splitting component includes at least one assembly part, one assembly part corresponds to one liquid crystal display module; the display side of at least one liquid crystal display module faces the corresponding assembly part and is installed on the assembly part, and a sealing structure is provided at least around the display side of the liquid crystal display module at the assembly gap between the liquid crystal display module and the polarization splitting component.

[0038] Exemplarily, the sealing structure includes a hollow area and a solid area located outside the hollow area;

[0039] In which, the display side of the liquid crystal display module includes a display area and a peripheral area located outside the display area, and the sealing structure is clamped between the display side and the assembly part, and the physical area is arranged corresponding to the peripheral area; and / or, the display side is in contact with the assembly part, and the physical area is arranged around the periphery of the liquid crystal display module for at least one week to seal the gap between the display side and the assembly part.

[0040] Exemplarily, the sealing structure includes at least one of foam sealant and sealing silicone.

[0041] Exemplarily, the sealing structure includes a light-transmitting layer located between the display side and the assembly portion, and adhesive is applied between a peripheral area of the light-transmitting layer and the display side, and between a peripheral area of the light-transmitting layer and the assembly portion, respectively.

[0042] Exemplarily, the polarization splitting component includes a polarization splitting main body component and at least one first frame provided on the polarization splitting main body component, and one first frame corresponds to one liquid crystal display module; the liquid crystal display module includes a display screen and a second frame fixed to the periphery of the display screen; wherein, the first frame is connected to the second frame to install the liquid crystal display module and the polarization splitting component together.

[0043] Exemplarily, the first frame and the second frame are connected by glue dispensing.

[0044] Exemplarily, the projection device further includes a heat dissipation structure, and the heat dissipation structure includes:

[0045] A first heat dissipation module is provided at the location of the light emitting component; and / or,

[0046] The second heat dissipation module is arranged at the location of the liquid crystal display module.

[0047] Exemplarily, the first heat dissipation module includes: a first base and a first heat dissipation component, the first base is arranged on the side of the light-emitting component away from the propagation direction of the light emitted by the light-emitting component, the first heat dissipation component includes a plurality of first heat dissipation fins, and the first heat dissipation component is arranged on one side of the light-emitting component along at least part of the light path of the light-emitting component.

[0048] Exemplarily, the second heat dissipation module includes: a second base and a second heat dissipation component, the second base is arranged on the non-display side of the liquid crystal display module, and the second heat dissipation component is arranged on the non-display side of the liquid crystal display module or on one side of the polarization splitting component.

[0049] Exemplarily, the heat dissipation structure further includes: the heat dissipation structure further includes: an air duct, the air duct including an air inlet and an air outlet;

[0050] A fan is provided in the air duct, and the fan is configured to blow the refrigerant gas entering the air duct from the air inlet toward at least the first heat dissipation module and / or the second heat dissipation module, and discharge the hot medium gas formed after heat exchange of the refrigerant gas from the air outlet.

[0051] Exemplarily, either the first heat dissipation module or the second heat dissipation module further includes a cooling fin, wherein the cooling fin is located between the first heat dissipation module and the light-emitting component, and heat conduction is performed between the first heat dissipation module and the light-emitting component, and / or the cooling fin is located between the second heat dissipation module and the liquid crystal display module, and heat conduction is performed between the second heat dissipation module and the liquid crystal display module.

[0052] In a second aspect, an embodiment of the present disclosure provides a projection system, comprising:

[0053] projection screens; and

[0054] In the projection device as described above, the projection screen is located on the light-emitting side of the projection lens and is configured to project the projection polarized light emitted by the projection device to form a projection image. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram showing the optical path of a projection device in some embodiments of the present disclosure;

[0056] Figure 2 A schematic diagram showing the structure of a liquid crystal display panel in a liquid crystal display module in some embodiments of the present disclosure;

[0057] Figure 3 A diagram showing the principle of an optical path for a projection device in some embodiments of the present disclosure to achieve 3D projection display;

[0058] Figure 4 One of the schematic diagrams showing the symmetrical arrangement of display images of the first liquid crystal display module and the second liquid crystal display module in some embodiments of the present disclosure;

[0059] Figure 5 A second schematic diagram showing symmetrical arrangement of display images of the first liquid crystal display module and the second liquid crystal display module in some embodiments of the present disclosure;

[0060] Figure 6 One of the light path diagrams of the light emitting assembly in some embodiments of the present disclosure is shown;

[0061] Figure 7A second light path diagram showing a light emitting component in some embodiments of the present disclosure;

[0062] Figure 8 A schematic diagram showing a partial sealing structure of a polarization beam splitting component and a liquid crystal display module in some embodiments of the present disclosure;

[0063] Figure 9 One of the schematic diagrams showing the sealing structure;

[0064] Figure 10 The second schematic diagram showing the sealing structure;

[0065] Figure 11 Schematic diagram showing the fully fitted and sealed structure of the polarization beam splitting component and the liquid crystal display module in other embodiments of the present disclosure;

[0066] Figure 12 One of the structural schematic diagrams showing the alignment and assembly of the polarization beam splitting component and the liquid crystal display module in some embodiments of the present disclosure;

[0067] Figure 13 A second structural diagram showing the alignment and assembly of the polarization beam splitting component and the liquid crystal display module in some embodiments of the present disclosure;

[0068] Figure 14 One of the structural schematic diagrams showing the heat dissipation structure in some embodiments of the present disclosure;

[0069] Figure 15 A second structural diagram showing the heat dissipation structure in some embodiments of the present disclosure;

[0070] Figure 16 A third structural diagram showing the heat dissipation structure in some embodiments of the present disclosure;

[0071] Figure 17 A fourth structural diagram showing the heat dissipation structure in some embodiments of the present disclosure;

[0072] Figure 18 A fifth structural diagram showing the heat dissipation structure in some embodiments of the present disclosure;

[0073] Figure 19 FIG6 is a sixth structural diagram showing the heat dissipation structure in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0074] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0075] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0076] As used in the embodiments of the present disclosure, the terms "parallel," "perpendicular," and "identical" include the strict sense of "parallel," "perpendicular," and "identical," as well as "approximately parallel," "approximately perpendicular," and "approximately identical" with respect to a certain tolerance, which, taking into account the tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), means within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the stated value.

[0077] In addition, in this document, unless otherwise defined, the terms "substantially," "essentially," "approximately," and "about" are used to describe and explain small variations. When used in connection with an event or circumstance, these terms can encompass situations where the event or circumstance occurs exactly, as well as situations where the event or circumstance occurs approximately. For example, when used in connection with a numerical value, these terms can include a range of variation of less than or equal to 10% of the numerical value, 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%, less than or equal to ±0.05%. The term "substantially coplanar" can refer to two surfaces being aligned along the same plane within the micrometer range, for example, within 40 μm, 30 μm, 20 μm, 10 μm, or 1 μm.

[0078] It should be understood that in the exemplary embodiments of the present disclosure, when a layer or element is referred to as being on another layer or substrate, the layer or element may be directly on the other layer or substrate, or an intervening layer may exist between the layer or element and the other layer or substrate. "A and B are disposed on the same layer" means that A and B are formed using the same film-forming process to form a film layer for forming a specific pattern, and then the layer structure is formed using the same mask through a single patterning process.

[0079] Before describing in detail the projection device and projection system provided by the embodiments of the present disclosure, the following description of related technologies is given:

[0080] In the related art, 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 swing of tiny metal reflectors, thereby controlling the image displayed. The other is a projection device based on a reflective liquid crystal display panel. The liquid crystal display panel of this projection device uses electrodes etched on a silicon substrate to control the deflection of liquid crystal molecules, thereby controlling the passage of light. However, the display panels of these two projection devices are relatively expensive, and the projection device usually requires the use of three panels.

[0081] In order to improve the above problems, embodiments of the present disclosure provide a projection device and a projection system, which realize projection display through a simple optical path and reduce costs.

[0082] like Figure 1 As shown, the projection device provided by the embodiment of the present disclosure includes: a projection lens 100 , a light emitting component 200 , a polarization beam splitting component 300 and at least one liquid crystal display module 400 .

[0083] 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, the second initial polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction;

[0084] The polarization beam splitting component 300 is 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, wherein the reflected polarized light is perpendicular to the propagation direction of the first initial polarized light, and the transmitted polarized light has the same propagation direction as the second initial polarized light;

[0085] At least one of the liquid crystal display modules 400 is disposed on the propagation path of the transmitted polarized light, and / or at least one of the liquid crystal display modules 400 is located on the propagation path of the reflected polarized light;

[0086] At least one of the liquid crystal display modules 400 is configured to modulate the transmitted polarized light or the reflected polarized light into projected polarized light and reflect the light back to the polarization beam splitter assembly 300. The polarization beam splitter assembly 300 is configured to transmit the projected polarized light to the projection lens 100. The projection lens 100 is configured to project the projected polarized light onto a predetermined area. The predetermined area may include, but is not limited to, a projection screen.

[0087] In the above scheme, the projection device includes a projection lens 100, a light-emitting component 200, a polarization splitting component 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. The polarization splitting component 300 allows light with the second polarization direction to pass through, while reflecting light with the first polarization direction. The first initial polarized light and the second initial polarized light 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 light path of at least one of the transmitted polarized light and the reflected polarized light. The liquid crystal display module 400 modulates light to form projected polarized light and reflects it back to the polarization splitting component 300. The polarization splitting component 300 then emits the projected polarized light to the projection lens 100, and the projection lens 100 projects the projected polarized light to a predetermined area. In this way, projection display is realized by using a simple optical path, and the purpose of projection display can be achieved through at least one liquid crystal display module 400, which reduces costs compared to the solution in the related art that requires three panels for projection.

[0088] As an exemplary embodiment, Figure 1As shown, 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, wherein 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; wherein,

[0089] The first liquid crystal display module LCD1 is used to modulate the transmitted polarized light into a first projected polarized light in a first polarization direction and reflect the light back to the polarization beam splitting component 300 . The polarization beam splitting component 300 is also used to reflect the first projected polarized light to the projection lens 100 .

[0090] The second liquid crystal display module LCD2 is used to modulate the reflected polarized light into a second projected polarized light having a second polarization direction, and reflect the reflected polarized light back to the polarization beam splitting component 300 . The polarization beam splitting component 300 is used to allow the second projected polarized light to pass through and be emitted to the projection lens 100 .

[0091] The projection lens 100 is configured to project the first projection polarized light and the second projection polarized light onto a predetermined area.

[0092] In the above solution, the light splitting characteristics of the polarization splitting component 300 are combined with the two liquid crystal display modules 400. Compared with the solution of only providing one liquid crystal display module 400, the utilization rate of the polarized light of the light emitting component 200 can be improved, thereby improving the brightness of the projected image.

[0093] As an exemplary embodiment, Figure 1 As shown, the polarization beam splitting assembly 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 splitting assembly 300, and the first direction X is perpendicular to the principal optical axis of the projection lens 100. Exemplarily, the preset angle θ is 45°.

[0094] Using the above solution, after the first initial polarized light enters the polarization beam splitter component 300, the polarization beam splitter component 300 reflects the first initial polarized light, obtaining reflected polarized light that propagates 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 enters the polarization beam splitter component 300, the polarization beam splitter component 300 allows the second initial polarized light to pass through, obtaining transmitted polarized light that propagates along the first direction X. Because the first liquid crystal display module LCD1 is located in the propagation path of the transmitted polarized light, and the second liquid crystal display module LCD2 is located in 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 perpendicular to each other. This arrangement simplifies the optical path and facilitates the layout and assembly of the entire projection device.

[0095] However, it should be noted that the value of the preset angle θ may not be limited to 45°. When the preset angle θ of the polarization splitting surface 310 of the polarization splitting component 300 relative to the first direction X is other angles, according to the optical path principle, the angle between the propagation directions of the transmitted polarized light and the reflected polarized light can be calculated and determined accordingly. 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 based on this angle.

[0096] In addition, it should be noted that, taking the example of the display sides a of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 being arranged perpendicular to each other, in some embodiments, such as Figure 4 As shown, the angle between the display side a of the first liquid crystal display module LCD1 and the polarization splitting surface 310 is a first angle α, and the angle between the display side a of the second liquid crystal display module LCD2 and the polarization splitting surface 310 is a second angle β, wherein 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°.

[0097] Exemplarily, α is 45° and β is 45°.

[0098] Furthermore, the polarization beam splitting component 300 may be implemented using a polarization beam splitting prism, or the polarization beam splitting component 300 may include a light-transmitting layer, such as a glass substrate, with a polarization beam splitting film disposed on the surface of the light-transmitting layer by coating or attaching. It should be understood that the specific structure of the polarization beam splitting component 300 is not limited.

[0099] The polarization splitting surface 310 of the polarization splitting component 300 has a characteristic in which 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 splitting component 300 are perpendicular to each other. For the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2, the polarization directions of the transmitted polarized light and the reflected polarized light are modulated respectively based on the deflection state of the liquid crystal. 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 splitting surface 310 in the polarization splitting component 300.

[0100] As an exemplary embodiment, the reflection axis angle of the polarization splitting surface 310 of the polarization splitting component 300 can range from 0 to 180 degrees. The reflection axis angle of the polarization splitting surface 310 refers to a specific angle of the polarization splitting surface 310 relative to the incident light beam.

[0101] Among them, the reflection axis angle of the polarization splitting surface 310 can be arbitrarily adjusted according to the coating direction of the polarization splitting surface 310. The angle can be determined in conjunction 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.

[0102] It should be noted that the liquid crystal alignment direction can be determined by the rubbing direction of the alignment film in the liquid crystal display panel, and a specific alignment film rubbing direction can only adapt to a specific polarization direction. Taking the paper surface of the figure as an example, when the reflection axis of the polarization splitting component 300 is 90°, that is, the reflection axis direction is parallel to the paper surface, the incident light of the second liquid crystal display module LCD2 (that is, 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 (that is, 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°.

[0103] As an exemplary embodiment, Figure 2 As shown, the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 both include a liquid crystal display panel 410 .

[0104] like Figure 2As shown, 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 a side of the second substrate 412 close to the display side a; the reflective layer 414 is disposed on the second substrate 412 and is capable of reflecting incident light from the display side a of the liquid crystal display panel 410 back to the display side a;

[0105] 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;

[0106] In the first state, the liquid crystal display panel 410 is capable of reflecting 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 perpendicular;

[0107] 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.

[0108] Illustratively, in the first state, the liquid crystal display panel 410 displays a picture, and in the second state, the liquid crystal display panel 410 does not display a picture.

[0109] Thus, in the first state, the liquid crystal display panel 410 displays an image and modulates the polarization direction of the polarized light incident thereon, and reflects the polarized light back to the polarization beam splitting component 300, so that the projected polarized light enters the projection lens 100, thereby achieving the final projection display purpose.

[0110] In the second state, the liquid crystal display panel 410 does not display the picture, and does not modulate the polarization direction of the polarized light incident therein, but directly reflects it back to the polarization splitting component 300, so that the reflected polarized light returns to the light-emitting element along the original path without being projected.

[0111] As an exemplary embodiment, Figure 2 As shown, the second substrate 412 includes a base substrate 4121 and a pixel driving circuit layer 4122 disposed on the base substrate 4121. The reflective layer 414 is disposed on a side of the pixel driving circuit layer 4122 away from the base substrate 4121.

[0112] With the above solution, since the pixel driving circuit layer 4122 is generally not light-transmissive, in order to improve the light efficiency, the reflective layer 414 is arranged on the side of the pixel driving circuit layer 4122 close 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. In addition, the reflective layer 414 is arranged on the second substrate 412, and the liquid crystal deflection can be utilized to achieve the purpose of modulating the polarized light.

[0113] In related technologies, projection devices can only display in black and white, and there is no color filter layer on the panel. Three LCOS (Liquid Crystal on Silicon) substrates or DMD (Digital Micromirror Device) chips are required, combined with a splitting optical path and a combining optical path, to achieve color image display.

[0114] To improve the above problem, 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 the embodiment of the present disclosure can realize a black and white projection image or a color projection image.

[0115] Specifically, see Figure 2 As shown, when the liquid crystal display panel 410 is a color display panel, the liquid crystal display panel 410 has at least two sub-pixels of different color lights, and a color filter layer 4111 is provided on the first substrate 411. The color filter layer 4111 includes array-distributed filter units 4112, and each of the filter units 4112 includes at least two filter areas 4113, and one of the filter areas 4113 corresponds to at least one sub-pixel setting.

[0116] Thus, since the liquid crystal display module 400 uses the liquid crystal display panel 410, a color filter layer 4111 can be provided on any liquid crystal display module 400, and a normal color image display can be realized by using one or two panels.

[0117] As an exemplary embodiment, Figure 4 As shown, the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 are configured to display images symmetrically about a first symmetry axis O; wherein, the 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 angle α+β, and the first symmetry axis O is the bisector of the third angle α+β.

[0118] The above scheme, such as Figure 3As shown, since the imaging light of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 is the first projected polarized light and the second projected polarized light, respectively, by configuring the display images on the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 to be symmetrical about the first symmetry axis O, the projected image can be a normal image. Specifically, when projecting a 3D image, the image content for the left and right eyes of the human eye can be imaged on the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2, respectively. In this way, when the viewer wears polarized glasses 20, a 3D projection display effect can be achieved.

[0119] Specifically, see Figure 4 As shown, in some exemplary embodiments, the first liquid crystal display module LCD1 has a plurality of first pixel units P1 distributed in an array, and the second liquid crystal display module LCD2 has a plurality of second pixel units P2 distributed in an array, and the first pixel units P1 and the second pixel units P2 are symmetrically distributed one by one about the first symmetry axis O; wherein, 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.

[0120] 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 light of different colors; 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 symmetry axis 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 symmetry axis O.

[0121] In the above solution, please combine Figure 4As shown, taking the pixel unit P including 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 in a mirror relationship, and the mirror plane is the polarization splitting plane 310 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 in a mirror relationship; 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 in a mirror relationship.

[0122] The principle of the projection device in the above embodiment to achieve 3D projection display is as follows:

[0123] The primary pixel formed by merging the three RGB sub-pixels in the first liquid crystal display module LCD1 displays the content of frame A in the 3D film. The primary pixel formed by merging the three RGB sub-pixels in the second liquid crystal display module LCD2 displays the content of frame B in the 3D film. Under the action of the polarization beam splitting component 300, the light from the sub-pixels at the corresponding mirrored positions of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 is finally merged together, but the polarization directions of the first projected polarized light and the second projected polarized light are mutually perpendicular, and are projected through the lens to a pixel on the projection screen 10. Because the polarized glasses 20 have polarizers with mutually perpendicular absorption axes attached to the left and right lenses, 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.

[0124] As another exemplary embodiment, Figure 5 As shown, 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 light of different colors; 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 symmetry axis 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 symmetry axis O.

[0125] In the above embodiment, please combine Figure 5As shown, taking the pixel unit P including R (red) sub-pixels, B (blue) sub-pixels and G (green) sub-pixels as an example, the R sub-pixel on the first liquid crystal display module LCD1 corresponds to the B sub-pixel on the second liquid crystal display module LCD2, and the two are in a mirror relationship, and the mirror plane is the polarization splitting plane 310 tilted at 45°; similarly, the B sub-pixel on the first liquid crystal display module LCD1 corresponds to the R sub-pixel on the second liquid crystal display module LCD2, and the two are in a mirror relationship; the G sub-pixel on the first liquid crystal display module LCD1 corresponds to the G sub-pixel on the second liquid crystal display module LCD2, and the two are in a mirror relationship.

[0126] The principle of the projection device in the above embodiment to achieve 3D projection display is as follows:

[0127] The primary pixel formed by merging the three RGB sub-pixels in the first liquid crystal display module LCD1 displays the content of frame A in the 3D film. The primary pixel formed by merging the three RGB sub-pixels in the second liquid crystal display module LCD2 displays the content of frame B in the 3D film. Under the action of the polarization beam splitting component 300, the light from the sub-pixels at the corresponding mirrored positions of the first liquid crystal display module LCD1 and the second liquid crystal display module LCD2 is ultimately merged together. However, the first projected polarized light and the second projected polarized light, with polarization directions perpendicular to each other, are projected through the projection lens 100 onto a pixel on the projection screen 10. Because the polarized glasses 20 have polarizers with perpendicular absorption axes attached to the left and right lenses, when a user wears the polarized glasses 20, their 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 their right eye will see the other image, thus achieving a pixel-level 3D projection display effect.

[0128] In the above embodiment, in any pair of symmetrically distributed first pixel units P1 and second pixel units P2, although the first pixel units P1 and the second pixel units P2 are symmetrically distributed in position, the RGB sub-pixels may not be completely symmetrically arranged. This is because the three RGB sub-pixels in each first pixel unit P1 or second pixel unit P2 are combined to form a primary pixel. In other words, the primary pixel ultimately formed by the combination of the three RGB sub-pixels of either the first pixel unit P1 or the second pixel unit P2 will still overlap at a pixel point on the projection screen 10, without affecting the imaging effect. Furthermore, with this design, the LCD panels 410 of the first and second LCD modules LCD1 and LCD2 do not need to be designed separately in terms of pixel structure, and can use the same pixel array design scheme, thereby reducing design difficulty and production costs without affecting the projection effect.

[0129] As an exemplary embodiment, Figure 6 and Figure 7 As shown, the light-emitting assembly 200 includes: a light-emitting component 210, a light-collecting component 220, and a collimating component 230. The diffused light emitted by the light-emitting component 210 includes at least light having a first polarization direction and a second polarization direction; the light-collecting component 220 is disposed on the optical path of the diffused light and is configured to converge the light incident thereon; the collimating component 230 is disposed on the propagation path of the light converged by the light-collecting component 220 and is configured to emit the light converged by the light-collecting component 220 as the first initial polarized light and the second initial polarized light.

[0130] In the above scheme, the light-emitting element is composed of a light source and a collimated light path. The light source is the light-emitting component 210. The collimated light path includes a focusing component 220 and a collimating component 230. The diffused light of the light-emitting component 210 is first converged and then emitted as collimated light through the collimating component 230.

[0131] Specifically, as an exemplary embodiment, Figure 6 As shown, the light-emitting component 210 coincides with the main optical axis of the focusing component 220 and is perpendicular to the main optical axis of the collimating component 230, and the light-emitting assembly 200 also includes a reflecting component 240, which is arranged on the propagation path of the light after being converged by the focusing component 220, and the reflecting component 240 is configured to emit the light converged by the focusing component to the collimating component 230.

[0132] For example, the reflective surface of the reflective component 240 may be inclined at an angle of 30° to 60°, for example, 45°, relative to the first direction X. 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.

[0133] By adopting the above solution, the main optical axis of the light emitting component 210 and the main optical axis of the collimating component 230 can be arranged vertically. At this time, the propagation direction of the light can be converted by arranging the reflecting component 240 on the optical path of the light emitting component 210.

[0134] The light path of the light-emitting element using the above structure is as follows: after the light emitted by the light-emitting component 210 passes through the focusing component 220, it is first converged once, and then diverged by the reflecting component 240 to illuminate the collimating component 230. The light emitted by the collimating component 230 can be convergent light or parallel light. If the light emitted by the collimating component 230 is convergent light, the convergent focus of the projected polarized light formed by the convergent light passing through the liquid crystal display module 400 and the polarization splitting component 300 is at the aperture position or the far end of the aperture of the projection lens 100; if the light emitted by the collimating component 230 is parallel light, the size of the projected polarized light formed by the parallel light passing through the liquid crystal display module 400 and the polarization splitting component 300 needs to be smaller than the size of the aperture of the projection lens 100. After being emitted by the collimating component 230, the light enters the polarization splitting component 300. After being split by the polarization splitting component 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 splitting component 300. After being reflected by the polarization splitting component 300 again, the light enters the projection lens 100 to complete the projection display.

[0135] In other exemplary embodiments, Figure 7 As shown, the main optical axis of the light emitting component 210 coincides with the main optical axes of the light focusing component 220 and the collimating component 230 , and the optical path focus of the light focusing component 220 coincides with the back focus of the collimating component 230 .

[0136] By adopting the above solution, in terms of spatial arrangement, the main optical axes of the light-emitting component 210, the focusing component 220 and the collimating component 230 can be coincident. Since the optical path focus of the focusing component 220 coincides with the back focus of the collimating component 230, the light can be collimated light when it is emitted through the collimating component 230. The advantage of this solution is that the light-emitting surface of the light source of the light-emitting component 210 is not limited by size and can be made of a relatively large size.

[0137] In order to more clearly illustrate the embodiments of the present disclosure, the following takes an exemplary embodiment, in which the polarized light having a first polarization direction is P light, the polarized light having a second polarization direction is S light, and the polarization splitting surface 310 in the polarization splitting component 300 has a preset angle θ of 45° relative to the first direction X as an example, and the optical path principle of the projection device provided by the embodiment of the present disclosure when two liquid crystal display modules 400 are used is described in more detail.

[0138] P-light and S-light refer to two different polarization states and are commonly used to describe the behavior of light waves at medium interfaces (such as reflection and refraction). P-light can refer to parallel polarized light, that is, light waves with a polarization direction parallel to the incident plane. S-light refers to light waves with a polarization direction perpendicular to the incident plane. In the phenomena of reflection and refraction, the reflection and refraction characteristics of P-light are different from those of S-light. At a specific incident angle (Brewster's angle) of P-light, the intensity of the reflected light will be reduced to a minimum. Compared with P-light, S-light behaves differently during reflection and refraction. At the Brewster's angle, the reflection intensity of S-light will not be reduced to a minimum like that of P-light.

[0139] See Figure 1 and Figure 6 、 Figure 7 As shown, the light emitted by the light-emitting component 210 can be considered a mixture of P light and S light. After being modulated by the focusing component 220 and the collimating component 230, the P light and S light are incident on the polarization beam splitter assembly 300. The 45°-tilted polarization beam splitter surface 310 in the polarization beam splitter assembly 300 reflects the P light and transmits the S light. Therefore, under the action of the polarization beam splitter assembly 300, the P light of the mixed light is reflected into the second liquid crystal display module LCD2, while the S light is transmitted into the reflective first liquid crystal display module LCD1. Theoretically, the P light and S light can each account for 50% of the total light emitted by the light-emitting component 210.

[0140] When the first and second liquid crystal display modules LCD1 and LCD2 are configured to display images, they rotate the polarization direction of polarized light by 90° and reflect it back along the original path to the polarization splitting component 300. Therefore, the light emitted by the second liquid crystal display module LCD2 is S light, and the light emitted by the first liquid crystal display module LCD1 is P light. The S light emitted by the second liquid crystal display module LCD2 passes through the polarization splitting component 300 and enters the projection lens 100. The P light emitted by the second liquid crystal display module LCD2 is reflected by the polarization splitting component 300 into the projection lens 100, ultimately reaching the projection screen 10 and forming an image. Furthermore, the display images of the first and second liquid crystal display modules LCD1 and LCD2 are symmetrical, with the displayed content being completely symmetrical. Thus, when displaying a normal image, the display content of the same pixel unit can overlap on the projection screen 10, and the brightness is superimposed.

[0141] 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 be changed. After the polarized light enters 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 splitting component 300 along the original path. Therefore, the output light of the second liquid crystal display module LCD2 is P light, and the output light of the first liquid crystal display module LCD1 is S light. The P light emitted by the second liquid crystal display module LCD2 is reflected by the polarization beam splitting component 300 into the collimating component 230, and the S light emitted by the first liquid crystal display module LCD1 will pass through the polarization beam splitting component 300 and enter the collimating component 230. In particular, the P light and S light returning from the polarization beam splitting component 300 to the collimating component 230 gradually attenuate after multiple reflections and transmissions along the optical path.

[0142] In addition, in the related art, the sealing and dustproof performance of the projection device is poor, and dust adhering to the display panel will affect the imaging, which is not conducive to long-term operation stability.

[0143] As shown in FIG8 , in some exemplary embodiments, the polarization beam splitting assembly 300 includes at least one mounting portion 320, one mounting portion 320 corresponding to one liquid crystal display module 400, and 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 splitting assembly 300 has one mounting portion 320, and the display side a of the liquid crystal display module 400 faces the mounting portion 320 and is mounted on the mounting portion 320. When there are two liquid crystal display modules 400, the polarization beam splitting assembly 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.

[0144] like Figure 8 and Figure 11 As shown, a sealing structure 500 is provided in the assembly gap between the liquid crystal display module 400 and the polarization beam splitting assembly 300, at least around the display side a of the liquid crystal display module 400. The provision of the sealing structure 500 can improve the poor sealing and dustproofing of the projection device, preventing dust from adhering to the liquid crystal display module 400 through the assembly gap, thereby enhancing the long-term operational stability of the projection device.

[0145] As an exemplary embodiment, Figure 9As shown, the sealing structure 500 includes a hollow area 510 and a solid area 520 located outside 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 outside the display area AA, and the sealing structure 500 is clamped between the display side a and the assembly portion 320, and the solid area 520 is arranged corresponding to the peripheral area B.

[0146] By adopting the above solution, by providing a hollow area 510 and a solid area 520 on the sealing structure 500, only the solid area 520 is attached to the peripheral area B of the display side a of the liquid crystal display module 400, so that 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 picture in the display area AA.

[0147] As another exemplary embodiment, Figure 10 As shown, the sealing structure 500 includes a hollow area 510 and a solid area 520 located outside 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 for at least one week to seal the gap between the display side a and the assembly part 320.

[0148] Using the above solution, the sealing structure 500 can also be arranged around the periphery of the entire liquid crystal display module 400 to seal the display side a 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 by using sealing silicone or the like.

[0149] The sealing structure 500 may be constructed as a rubber sealant, such as a foam frame adhesive, etc. Alternatively, the sealing structure 500 may be implemented using sealing silica gel, etc.

[0150] It should be noted that the sealing structure 500 can be set only in the peripheral area B of the display side a of the liquid crystal display module 400; or, the sealing structure 500 can be set only on the periphery of the liquid crystal display module 400; or, the sealing structure 500 can be set at the same time in the peripheral area B of the display side a of the liquid crystal display module 400 and on the periphery of the liquid crystal display module 400.

[0151] In addition, in some other exemplary embodiments of the present disclosure, Figure 11 As shown, 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 respectively 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.

[0152] For example, the light-transmitting layer 540 can be any suitable structure such as an optical glass substrate, an optical adhesive layer, etc. The size of the light-transmitting layer 540 can be roughly the same as the size of the liquid crystal display module 400, and the light-transmitting layer 540 can be sealed and connected to the liquid crystal display module 400 and the assembly part 320 respectively by adhesive 530 such as UV curing adhesive on all sides of the light-transmitting layer 540, so as to achieve full fitting and sealing.

[0153] In addition, when assembling the structure of the projection device, it is necessary to combine the optical path design and accurately align the polarization beam splitting component 300 and the liquid crystal display module 400.

[0154] In order to improve the alignment accuracy, in some embodiments, such as Figure 12 and Figure 13 As shown, the polarization beam splitting assembly 300 includes a polarization beam splitting main body 301 and at least one first frame 302 disposed on the polarization beam splitting main body 301, with each first frame 302 corresponding to each liquid crystal display module 400. The liquid crystal display module 400 includes a display screen 401 and a second frame 402 secured to the periphery of the display screen 401. The first frame 302 is connected to the second frame 402 to mount the liquid crystal display module 400 and the polarization beam splitting assembly 300 together. Exemplarily, the first frame 302 and the second frame 402 may be connected by dispensing glue.

[0155] When aligning and assembling the liquid crystal display module 400 and the polarization splitting component 300, the display screen 401 and the second frame 402 can be assembled together first, and the two can be relatively fixed to form the liquid crystal display module 400; and the first frame 302 and the polarization splitting main body component 301 can be assembled together, and the two can be relatively fixed to form the polarization splitting component 300; then, the polarization splitting component 300 is installed on the fixed fixture of the alignment machine and kept stationary, and the liquid crystal display module 400 is fixed to the movable fixture of the alignment machine, and the liquid crystal display module 400 is installed on the polarization splitting component 300 using the movable fixture; then, fine-tuning of alignment is performed; after the fine-tuning is completed, glue curing is performed at several positions between the first frame 302 and the second frame 402 to complete the alignment assembly of the liquid crystal display module 400 and the polarization splitting component 300.

[0156] It should be noted that the number of dispensing locations may include, but is not limited to, four dispensing locations, and the distribution of the dispensing locations 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 locations are not limited as long as they are fixed after dispensing.

[0157] Also, see Figure 12 FIG. 4 is a schematic diagram showing the structure of the liquid crystal display module 400 and the polarization beam splitting component 300 after alignment and assembly in an embodiment including only one liquid crystal display module 400; see FIG. Figure 13 FIG. 4 is a schematic diagram of the structure of an embodiment including two LCD modules 400 after alignment and assembly of the LCD module 400 and the polarization beam splitting assembly 300. When there are two LCD modules 400, during assembly, after the second frame 402 of one LCD module 400 is aligned with the first frame 302 and the glue is cured, another movable fixture can be used to align and assemble the other LCD module 400 in the same manner. After fine-tuning the alignment of the two LCD modules 400, the glue is then cured simultaneously. However, this is not a limitation.

[0158] In addition, in the related art, the heat dissipation capacity of the projection device is poor, resulting in poor operating stability of the projection device. In order to improve the above problem, in some embodiments of the present disclosure, such as Figures 14 to 19 As shown, 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 may be located at the location of the light-emitting component 200 to dissipate heat from the light-emitting component 200; or, the heat dissipation structure 700 may include a second heat dissipation module 720, which may be located at the location of the liquid crystal display module 400 to dissipate heat from the liquid crystal display module 400; or, the heat dissipation structure 700 may include a first heat dissipation module 710 and a second heat dissipation module 720, wherein the first heat dissipation module 710 may be located at the location of the light-emitting component 200 to dissipate heat from the light-emitting component 200, and the second heat dissipation module 720 may be located at the location of the liquid crystal display module 400 to dissipate heat from the liquid crystal display module 400. In this way, the heat dissipation capacity of the projection device can be improved.

[0159] As an exemplary embodiment, Figure 15 As shown, the second heat dissipation module 720 includes: a second base 721 and a second heat dissipation component 722, the second base 721 is arranged on the non-display side b of the liquid crystal display module 400, and the second heat dissipation component 722 is arranged on the non-display side b of the liquid crystal display module 400 or on one side of the polarization splitting component 300.

[0160] With the above solution, since the liquid crystal display module 400 forms an image on the display surface, the second heat dissipation module 720 can be provided on the non-display side b of the liquid crystal display module 400 to dissipate heat from the liquid crystal display module 400 .

[0161] Illustratively, the heat dissipation structure 700 may further include a cooling fin 730 . The cooling fin 730 is located between the second heat dissipation module 720 and the liquid crystal display module 400 and performs heat conduction between the second heat dissipation module 720 and the liquid crystal display module 400 .

[0162] In the above scheme, a cooling plate 730, such as a TEC (semiconductor cooling plate), is set on the non-display side b of the liquid crystal display module 400, and a heat-conducting medium such as thermal glue, thermal pad, and thermal plate can be filled between the non-display side b of the liquid crystal display module 400 and the cooling plate 730. The second heat dissipation module 720 can be attached and bonded on the side of the cooling plate 730 away from the liquid crystal display module 400 by a heat-conducting medium such as thermal glue, thermal pad, and thermal plate, so as to improve the heat dissipation capacity of the liquid crystal display module 400.

[0163] It should be noted that, in some embodiments, the cooling plate 730 may be arranged 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 plate 730 may not be arranged, 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 heat-conducting medium, which can also achieve the purpose of heat dissipation.

[0164] The cooling fin 730 is provided between the second heat dissipation module 720 and the non-display side b of the liquid crystal display module 400 to improve heat dissipation efficiency, but at the cost of more. In practical applications, whether to provide the cooling fin 730 can be reasonably selected according to actual needs.

[0165] Furthermore, the second heat sink 722 may include, for example, a second fin heat sink structure 7220, which may be made of a metal material with good heat dissipation properties, such as aluminum or copper. For example, the second fin heat sink structure 7220 may include, but is not limited to, copper tubes or extruded aluminum heat sinks. The area and number of heat sinks of the second fin heat sink structure 7220 may be adjusted based on the power and volume requirements of the liquid crystal display module 400. For example, the number of copper tubes or extruded aluminum heat sinks may be 1 to 4, but is not limited thereto.

[0166] In addition, regarding the spatial arrangement, please see Figure 15 As shown, the second base 721 can be attached to the non-display side b of the liquid crystal display module 400 , and the second heat dissipation component 722 can be provided on the non-display side b of the liquid crystal display module 400 or on one side of the polarization splitting component 300 .

[0167] Specifically, taking the polarization beam splitting assembly 300 as an example, comprising an upper surface 300a, a lower surface 300b, and six side surfaces 300c, the liquid crystal display module 400 can be disposed on one side 300c of the polarization beam splitting assembly 300, and the second heat dissipation component 722 can be disposed on the side of the lower surface 300b of the polarization beam splitting assembly 300. This can make the spatial structure of the entire projection device more compact. It will be appreciated that the specific location of the second heat dissipation component 722 is not limited to this.

[0168] In addition, for a projection device that includes only one liquid crystal display module 400, only one second heat dissipation module 720 can be set, which can be arranged in a larger space; and for a projection device that includes two liquid crystal display modules 400, two second heat dissipation modules 720 can be set, and interference between the two second heat dissipation modules 720 needs to be avoided in the spatial arrangement.

[0169] In some embodiments, see Figure 14 As shown, taking the polarization splitting component 300 including an upper surface 300a, a lower surface 300b and six side surfaces 300c as an example, the first liquid crystal display module LCD1 can be arranged on the first side surface 300c1 of the polarization splitting component 300, and the second liquid crystal display module LCD2 can be arranged on the second side surface 300c2 of the polarization splitting component 300, and two second heat dissipation components 722 can be arranged side by side on one side of the lower surface 300b of the polarization splitting module, and one second heat dissipation component 722 is located directly below the lower surface 300b of the polarization splitting module, and the other second heat dissipation component 722 can be located below the lower surface 300b of the polarization splitting module and offset toward the side where the first side surface 300c1 is located.

[0170] In this way, since the second liquid crystal display module LCD2 and the second base 721 are also provided on the first side surface 300c1, the space below the second liquid crystal display module LCD2 and the second base 721 provided on the first side surface 300c1 can be fully utilized to arrange the second heat dissipation component 722, which makes the structure more compact and helps to reduce the volume of the entire machine.

[0171] It can be 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 thereto.

[0172] In addition, in some exemplary embodiments of the present disclosure, Figure 15As shown, the first heat dissipation module 710 includes: a first base 711 and a first heat dissipation component 712, the first base 711 is arranged on the side of the light-emitting component 200 away from the propagation direction of the light 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 part of the path of the light path of the light-emitting component 200.

[0173] In some embodiments, as Figure 15 As shown, taking the polarization beam splitting component 300 including an upper surface 300a, a lower surface 300b, and six side surfaces 300c as an example, the light-emitting component 200 can be disposed on one side 300c of the polarization beam splitting component 300, and the first heat dissipation component 712 can be disposed on the side where the lower surface 300b of the polarization beam splitting module 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.

[0174] In other embodiments, see Figure 15 As shown, taking the polarization beam splitting component 300 including upper and lower surfaces 300b and six side surfaces 300c as an example, at least one liquid crystal display module 400 can be disposed on the first side surface 300c1 of the polarization beam splitting component 300, the light-emitting component 200 can be disposed on the second side surface 300c2 of the polarization beam splitting component 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 splitting module corresponding to the first side surface 300c1. In this way, the spatial structure of the entire projection device can be made more compact. It is understood that the specific location of the first heat dissipation component 712 is not limited to this.

[0175] Illustratively, the heat dissipation structure 700 may further include a cooling fin 730 . The cooling fin 730 is located between the first heat dissipation module 710 and the light emitting component 200 and performs heat conduction between the first heat dissipation module 710 and the light emitting component 200 .

[0176] In the above scheme, a cooling plate 730, such as a TEC (semiconductor cooling plate 730), is provided on the side of the light-emitting component 200 away from its emitted light, and a heat-conducting medium such as thermal glue, thermal pad, and thermal plate can be filled between the side of the light-emitting component 200 away from its emitted light and the cooling plate 730, and the second heat dissipation module 720 can be attached and bonded on the side of the cooling plate 730 away from the light-emitting component 200 through a heat-conducting medium such as thermal glue, thermal pad, and thermal plate, so as to improve the heat dissipation capacity of the light-emitting component 200.

[0177] It should be noted that, in some embodiments, the cooling plate 730 may be arranged between the first heat dissipation module 710 and the light-emitting component 200; in other embodiments, the cooling plate 730 may not be arranged, and the first heat dissipation module 710 may be directly bonded to the light-emitting component 200 through a heat-conducting medium, which can also achieve the purpose of heat dissipation.

[0178] The cooling fin 730 is provided between the first heat dissipation module 710 and the light emitting assembly 200 to improve heat dissipation efficiency, but it will increase costs. In practical applications, whether to provide the cooling fin 730 can be reasonably selected according to actual needs.

[0179] Furthermore, illustratively, the first heat dissipation component 712 may include a first fin heat dissipation structure 7120, which may be made of a metal material with good heat dissipation properties, such as aluminum or copper. For example, the first fin heat dissipation structure 7120 may include, but is not limited to, a copper tube or an aluminum extruded heat sink. The area and number of heat sinks of the first fin heat dissipation structure 7120 may be adjusted based on the power and volume requirements of the liquid crystal display module 400. For example, the number of copper tubes or aluminum extruded heat sinks may be 1 to 4, but is not limited thereto.

[0180] In addition, regarding the spatial arrangement, please see Figure 15 As shown, the first base 711 can be attached to the light emitting component 200 , and the first heat dissipation component 712 can be arranged on the side of the light emitting component 200 away from the emitted light, or arranged along the light path of the light emitting component 200 .

[0181] It should be noted that Figure 14 FIG. 4 is a schematic diagram showing the arrangement position of the second heat dissipation module 720 when the projection device includes two liquid crystal display modules 400 ; Figure 15 FIG. 1 is a schematic diagram showing the arrangement position of the second heat dissipation module 720 when the projection device includes a liquid crystal display module 400 .

[0182] Also, see Figure 15 As shown, in some embodiments, the heat dissipation structure 700 further includes at least one fan 740 , and the fan 740 can be directed toward the first heat dissipation component 712 and / or the second heat dissipation component 722 to further improve the heat dissipation capability.

[0183] For example, see Figure 15 As shown, there may be two fans 740 , one fan 740 is used to directly blow the first heat dissipation component 712 , and the other fan 740 is used to directly blow the second heat dissipation component 722 .

[0184] In addition, with respect to the overall structure of the projection device, in order to protect and dustproof various components, 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 splitting component 300 may be accommodated inside the housing 800.

[0185] Among them, exemplary, Figure 16 As shown, the heat dissipation structure 700 further includes an air duct 810 , and the air duct 810 includes an air inlet 811 and an air outlet 812 . The air inlet 811 and the air outlet 812 can be provided on the housing 800 , and the fan 740 can be provided in the air duct 810 .

[0186] In some embodiments, Figure 16 As shown, the fan 740 is arranged in the air duct 810, and the fan 740 is configured to make the refrigerant gas entering the air duct 810 from the air inlet 811 blow at least toward the first heat dissipation module 710 and / or the second heat dissipation module 720, and discharge the hot medium gas formed after the heat exchange of the refrigerant gas from the air outlet 812.

[0187] For example, the fan 740 may be a centrifugal fan. Figure 16 As shown in the figure, arrows indicate the direction of airflow. Under the action of the fan 740, external refrigerant gas can enter the housing 800 through the air inlet 811, forming an airflow in the air duct 810. The air inlet of the fan 740 is directed toward the air duct 810, and the air outlet of the fan 740 is directed toward the first heat dissipation module 710 and / or the second heat dissipation module 720, so as to blow the refrigerant gas toward the first heat dissipation module 710 and / or the second heat dissipation module 720, so that the refrigerant gas is heat-exchanged to form a hot medium gas, which is then discharged from the air outlet 812.

[0188] For example, see Figure 16 As shown, the air inlet 811 and the air outlet 812 are arranged on opposite sides of 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 is arranged toward the air duct 810, and the air outlet 812 of the fan 740 is arranged toward the first heat dissipation component 712 and the second heat dissipation component 722. The airflow direction is indicated by the arrows in the figure. The refrigerant gas entering the housing 800 through the air inlet 811 is blown by the fan 740 toward the first heat dissipation component 712 and the second heat dissipation component 722, and then discharged through the air outlet 812.

[0189] For example, see Figure 16 As shown, a partition 820 may be further provided on the air duct 810 between the air inlet 811 and the air outlet 812 , and the partition 820 is used to prevent backflow of air.

[0190] In addition, in some embodiments, see Figure 16 and Figure 17 As shown, the housing 800 is constructed to include a plurality of 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 disposed between the polarization beam splitting assembly 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 provided on the first inclined bottom surface 8032, and the air outlet 812 is provided on the second inclined bottom surface 8033. This arrangement is beneficial to the overall appearance design of the device.

[0191] In addition, in some other embodiments, please combine Figure 16 and Figure 18 As shown, 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, and the first heat dissipation component 712 and the second heat dissipation component 722 are arranged between the polarization beam splitting component 300 and the first circumferential side surface. The bottom surface 803 is provided with an air inlet 811, and the first circumferential side surface is constructed to form a circular arc corner structure 804 with the bottom surface 803. The top surface 802 is provided with an air outlet 812. The bottom surface 803, the circular arc corner structure 804, and the first circumferential side surface cooperate to form an air duct 810. The refrigerant gas entering the interior of the housing 800 from the air inlet 811 is blown toward the first heat dissipation component 712 and the second heat dissipation component 722 under the action of the fan 740 to dissipate heat.

[0192] It should be understood that the above is merely an exemplary description of the overall structural arrangement of the projection device, but is not limited thereto. In actual applications, the overall structure of the projection device can be designed based on actual needs.

[0193] See Figure 18 and Figure 19 FIG. 1 shows the arrangement structure of the air duct 810 and the fan 740 when the projection device includes only one liquid crystal display module 400 (single-panel projection device for short); see FIG. Figure 17FIG. 1 illustrates the arrangement of the air duct 810 and the fan 740 when the projection device includes two LCD modules 400 (referred to as a dual-panel projection device). Regardless of whether the projection device is a single-panel or dual-panel projection device, the overall structure of the air duct 810 and the arrangement of the fan 740 are substantially the same.

[0194] In addition, for a dual-panel projection device, 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 each can be provided with one fan 740 for heat dissipation. The number of the fans 740 is not limited.

[0195] In addition, the above describes the heat dissipation of the liquid crystal display module 400 and the light-emitting component 200. In other embodiments, heat dissipation can also be performed on optical devices in the optical path of the projection device, such as the polarization splitting component 300 and the projection lens 100, to further improve the heat dissipation capacity of the entire device.

[0196] For example, the optical components in the optical path of the projection device can be cooled by air cooling. Figure 19 As shown, a hollow duct 840 is provided inside the housing 800, and a first air outlet 841 and a plurality of second air outlets 842 are provided on the duct 840, wherein a fan 740 is connected at any position of the first air outlet 841 and the second air outlet 842, and the wind blown out by the fan 740 is divided into a plurality of air flows by the plurality of second air outlets 842. The number of the second air outlets 842 depends on the number of heat dissipation requirements of the optical devices in the optical path, and the air flows can pass through the corresponding optical devices to dissipate heat for the optical devices.

[0197] 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 set on the light-emitting component 200, and then be discharged to the outside through the air outlet 812 of the whole machine.

[0198] In the above solution, the gas used to dissipate heat from the optical device in the projection apparatus can simultaneously dissipate heat for the first heat dissipation module 710 on the light-emitting assembly 200 , thereby playing a role of superimposed heat dissipation and effectively improving heat dissipation efficiency.

[0199] A heat dissipation simulation was performed on the projection device in some embodiments of the present disclosure. The specific heat dissipation ratio is shown in Table 1:

[0200] Table 1

[0201] Device Absorbed heat W Light-emitting components 50 Light-collecting component (TIR lens) 0.3 Reflective components 0.7 Collimating components (Fresnel mirror) 1 Polarized beam splitter 4 LCD display module 400 10 Philippine Mirror 0.1

[0202] Using simulation software, based on the temperature distribution of each area of the LCD module, it can be seen that the highest temperature point on the LCD module 400 is 81° C., which meets the heat dissipation requirements.

[0203] In addition, an embodiment of the present disclosure provides a projection system, comprising: a projection screen 10; and a projection device provided by an embodiment of the present disclosure, wherein the projection screen 10 is located on the light-emitting side of the projection lens 100, and is configured to project the projection polarized light emitted by the projection device to form a projection picture.

[0204] Obviously, the projection system provided by the embodiment of the present disclosure also has the beneficial effects brought by the projection device provided by the embodiment of the present disclosure, which will not be described in detail here.

[0205] There are a few points to note:

[0206] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0207] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present disclosure are exaggerated or reduced, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or intervening elements may be present.

[0208] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0209] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A projection device, characterized in that: include: projection lens; A light-emitting component, configured to emit a first initial polarized light and a second initial polarized light, wherein the first initial polarized light has a first polarization direction, the second initial polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction; a polarization splitter component, 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, wherein the reflected polarized light has a propagation direction perpendicular to that of the first initial polarized light, and the transmitted polarized light has a propagation direction identical to that of the second initial polarized light; and At least one liquid crystal display module, at least one of the liquid crystal display modules is arranged on the propagation path of the transmitted polarized light, and / or at least one of the liquid crystal display modules is located on the propagation 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 splitting component. The polarization splitting component is used to emit the projected polarized light to the projection lens; the projection lens is used to project the projected polarized light to a predetermined area.

2. The projection device according to claim 1, wherein: The at least one liquid crystal display module includes a first liquid crystal display module and a second liquid crystal display module, the first liquid crystal display module is located on the propagation path of the transmitted polarized light, and the second liquid crystal display module is located on the propagation path of the reflected polarized light; The first liquid crystal display module is used to modulate the transmitted polarized light into a first projected polarized light with a first polarization direction, and reflect it back to the polarization splitting component. The polarization splitting component 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 a second projected polarized light with a second polarization direction, and reflect it back to the polarization splitting component. The polarization splitting component is used to allow the second projected polarized light to pass through and be emitted to the projection lens. The projection lens is used to project the first projected polarized light and the second projected polarized light to a predetermined area.

3. The projection device according to claim 2, wherein: The first liquid crystal display module and the second liquid crystal display module each 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 arranged in a cell, wherein the first substrate is located on a side of the second substrate close to the display side; a liquid crystal layer disposed between the first substrate and the second substrate; and A reflective layer, the reflective layer being provided on the second substrate and 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 is perpendicular to that of the reflected light; 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 is the same as that of the reflected light.

4. The projection device according to claim 3, wherein: 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 of the pixel units includes at least two sub-pixels emitting light of different colors, a color filter layer is provided on the first substrate, the color filter layer includes filter units distributed in an array, each of the filter units includes at least two filter areas, and one filter area corresponds to at least one sub-pixel setting.

5. The projection device according to claim 3, wherein: The second substrate includes a base substrate and a pixel driving circuit layer provided on the base substrate, wherein the reflective layer is provided on a side of the pixel driving circuit layer away from the base substrate.

6. The projection device according to claim 2, wherein: The polarization splitting component has a polarization splitting surface, which is configured to form a preset angle relative to a 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 splitting component, and the first direction is perpendicular to the main optical axis of the projection lens.

7. The projection device according to claim 6, wherein: The preset angle is 45°.

8. The projection device according to claim 6, wherein: The reflection axis angle of the polarization splitting surface ranges from 0 to 180 degrees.

9. The projection device according to claim 6, wherein: The angle between the display side of the first liquid crystal display module and the polarization splitting plane is a first angle α, and the angle between the display side of the second liquid crystal display module and the polarization splitting plane is a second angle β, wherein 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°.

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

11. The projection device according to claim 10, wherein: The first liquid crystal display module has a plurality of first pixel units distributed in an array, and the second liquid crystal display module has a plurality of second pixel units distributed in an array, and the first pixel units and the second pixel units are symmetrically distributed one by one about the first symmetry axis; 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.

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

13. The projection device according to claim 11, wherein: The first pixel unit and the second pixel unit respectively include a first sub-pixel and a second sub-pixel for emitting light of different colors, 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 symmetrically arranged about the first symmetry axis, and the first sub-pixel in the first pixel unit and the second sub-pixel in the second pixel unit are symmetrically arranged about the first symmetry axis.

14. The projection device according to claim 2, wherein: The light emitting component comprises: a light-emitting component, wherein the diffused light emitted by the light-emitting component includes at least light with a first polarization direction and a second polarization direction; a light-converging component disposed on the optical path of the diffused light, the light-converging component being configured to converge the light incident on the light-converging component; The collimating component is provided on a propagation path of the light focused by the focusing component, and is configured to emit the light focused by the focusing component into collimated light, wherein the collimated light includes the first initial polarized light and the second initial polarized light.

15. The projection device according to claim 14, wherein: The main optical axis of the light emitting component coincides with the main optical axes of the light collecting component and the collimating component, and the optical path focus of the light collecting component coincides with the back focus of the collimating component; or, The light-emitting component coincides with the main optical axis of the light-collecting component and is perpendicular to the main optical axis of the collimating component. The light-emitting component also includes a reflecting component, which is arranged on the propagation path of the light after being converged by the light-collecting component, and the reflecting component is configured to emit the light after being converged by the light-collecting component to the collimating component.

16. The projection device according to claim 14, wherein: The light-focusing component includes a total internal reflection lens, and the collimating component includes a Fresnel lens.

17. The projection device according to claim 1, wherein: The polarization splitting component includes at least one assembly part, one assembly part corresponds to one liquid crystal display module; the display side of at least one liquid crystal display module faces the corresponding assembly part and is installed on the assembly part, and a sealing structure is provided at least around the display side of the liquid crystal display module at the assembly gap between the liquid crystal display module and the polarization splitting component.

18. The projection device according to claim 17, wherein: The sealing structure includes a hollow area and a solid area located outside the hollow area; In which, the display side of the liquid crystal display module includes a display area and a peripheral area located outside the display area, and the sealing structure is clamped between the display side and the assembly part, and the physical area is arranged corresponding to the peripheral area; and / or, the display side is in contact with the assembly part, and the physical area is arranged around the periphery of the liquid crystal display module for at least one week to seal the gap between the display side and the assembly part.

19. The projection device according to claim 18, wherein: The sealing structure includes at least one of foam frame glue and sealing silicone.

20. The projection device according to claim 17, wherein: The sealing structure includes a light-transmitting layer located between the display side and the assembly portion, and adhesive is applied between a peripheral area of the light-transmitting layer and the display side, and between the peripheral area of the light-transmitting layer and the assembly portion.

21. The projection device according to claim 1, wherein The polarization splitting component includes a polarization splitting main body component and at least one first frame provided on the polarization splitting main body component, and one first frame corresponds to one liquid crystal display module; the liquid crystal display module includes a display screen and a second frame fixed to the periphery of the display screen; wherein the first frame is connected to the second frame to install the liquid crystal display module and the polarization splitting component together.

22. The projection device according to claim 21, wherein: The first frame and the second frame are connected by glue dispensing.

23. The projection device according to claim 1, wherein: The projection device further includes a heat dissipation structure, which includes: A first heat dissipation module is provided at the location of the light emitting component; and / or, The second heat dissipation module is arranged at the location of the liquid crystal display module.

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

25. The projection device according to claim 23, wherein: The second heat dissipation module includes: a second base and a second heat dissipation component. The second base is arranged on the non-display side of the liquid crystal display module, and the second heat dissipation component is arranged on the non-display side of the liquid crystal display module or on one side of the polarization splitting component.

26. The projection device according to claim 23, wherein: The heat dissipation structure further includes: an air duct, the air duct including an air inlet and an air outlet; A fan is provided in the air duct, and the fan is configured to blow the refrigerant gas entering the air duct from the air inlet toward at least the first heat dissipation module and / or the second heat dissipation module, and discharge the hot medium gas formed after heat exchange of the refrigerant gas from the air outlet.

27. The projection device according to claim 23, wherein: Either the first heat dissipation module or the second heat dissipation module further includes a cooling fin, wherein the cooling fin is located between the first heat dissipation module and the light-emitting component, and heat conduction is performed between the first heat dissipation module and the light-emitting component, and / or the cooling fin is located between the second heat dissipation module and the liquid crystal display module, and heat conduction is performed 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 exit side of the projection lens and is configured to project the projection polarized light emitted by the projection device to form a projection image.

Images