Liquid crystal projection device

Abstract

The invention provides a liquid crystal projection device, belongs to the technical field of projection display, and can solve the problems of low color gamut and non-uniform illumination in the prior art. The liquid crystal projection device comprises a laser light source assembly, a beam expanding lens assembly, a dodging lens assembly and a liquid crystal imaging assembly. The laser light source assembly is used for generating laser in various colors and combining the laser in various colors into one laser beam; the optical axes of the lasers of all colors in the combined laser beams are coaxial; the beam expanding lens assembly is used for expanding the emitting range of the laser beam emitted to the dodging lens assembly; the dodging lens assembly is used for converging the laser beams in the emergent range to the liquid crystal imaging assembly; and the liquid crystal imaging assembly is used for modulating the received laser beam and generating a projection picture.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of projection display, and particularly relates to a liquid crystal projection device. Background Art

[0002] With the continuous progress of Liquid Crystal Display (LCD) technology, the market demand for LCD products has shown a significant increase in recent years. Among them, liquid crystal projectors, as an important branch of projection technology, have maintained a stable development trend in the consumer electronics market. Their technical characteristics and market positioning give them significant advantages in specific fields. Summary of the Invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a liquid crystal projection device.

[0004] In a first aspect, the technical solution adopted to solve the technical problems of the present disclosure is a liquid crystal projection device, including: a laser light source assembly, a first lens assembly, a second lens assembly, and a liquid crystal imaging assembly;

[0005] The laser light source assembly is configured to generate lasers of multiple colors and combine the lasers of the multiple colors into a laser beam; the optical axes of the lasers of each color in the combined laser beam are coaxial;

[0006] The first lens assembly is configured to expand the outgoing range of the laser beam to the second lens assembly;

[0007] The second lens assembly is configured to converge the laser beam within the outgoing range to the liquid crystal imaging assembly;

[0008] The liquid crystal imaging assembly is configured to modulate the received laser beam to generate a projection image.

[0009] In some embodiments, the laser light source assembly includes a three-color laser, a mirror group, and a dichroic mirror group; the lasers of the multiple colors include red laser, green laser, and blue laser; the optical axes of the red laser, the green laser, and the blue laser are coaxial;

[0010] The three-color laser is configured to generate the red laser, the green laser, and the blue laser;

[0011] The mirror group is configured to reflect the green laser to a first position in the dichroic mirror group and reflect the blue laser to a second position in the dichroic mirror group; the orthographic projections of the first position and the second position on a horizontal reference plane overlap;

[0012] The dichroic mirror group is configured to transmit the blue laser from the first position and the second position, reflect the green laser from the second position, and transmit the red laser from the first position and the second position.

[0013] In some embodiments, the three-color laser includes a red laser, a green laser, and a blue laser; the green laser and the blue laser are arranged side by side in a first direction, and the red laser and the green laser are arranged side by side in a second direction;

[0014] The red laser is configured to generate the red laser and emit it in a third direction; the third direction, the first direction, and the second direction are perpendicular to each other pairwise;

[0015] The green laser is configured to generate the green laser and emit it in the third direction;

[0016] The blue laser is configured to generate the blue laser and emit it in the third direction.

[0017] In some embodiments, the mirror group includes a first mirror subgroup and a second mirror subgroup; the first mirror subgroup includes a first mirror, a second mirror, and a third mirror; the second mirror subgroup includes a fourth mirror, a fifth mirror, and a sixth mirror; the dichroic mirror group includes a first dichroic mirror and a second dichroic mirror;

[0018] The first mirror is configured to receive the blue laser emitted from the blue laser and reflect the blue laser to the second mirror; the second mirror is configured to reflect the blue laser to the third mirror, and the third mirror is configured to reflect the blue laser to the first position in the first dichroic mirror;

[0019] The fourth mirror is configured to receive the green laser emitted from the green laser and reflect the green laser to the fifth mirror; the fifth mirror is configured to reflect the green laser to the sixth mirror, and the sixth mirror is configured to reflect the green laser to the second position of the second dichroic mirror;

[0020] The first dichroic mirror is configured to reflect the blue laser to the second position of the second dichroic mirror; and receive the red laser emitted from the red laser chip group and transmit the red laser from the first position to the second position of the second dichroic mirror;

[0021] The second dichroic mirror is configured to transmit the blue laser from the second position, reflect the green laser from the second position, and transmit the red laser from the second position.

[0022] In some embodiments, the second reflecting subgroup is disposed on a side of the first reflecting subgroup away from the blue laser and the green laser;

[0023] The orthographic projection of the first mirror on the horizontal reference plane covers the orthographic projection of the blue laser on the horizontal reference plane; the orthographic projection of the fourth mirror on the horizontal reference plane covers the orthographic projection of the green laser chip on the horizontal reference plane; the edge of the orthographic projection of the first mirror on the horizontal reference plane abuts against the edge of the orthographic projection of the fourth mirror on the horizontal reference plane;

[0024] The angle between the extension plane of the reflecting surface of the first mirror and the horizontal reference plane is an acute angle; the angle between the extension plane of the reflecting surface of the fourth mirror and the horizontal reference plane is an acute angle.

[0025] In some embodiments, the orthographic projection of the second mirror on the horizontal reference plane overlaps with the orthographic projection of the fifth mirror on the horizontal reference plane; the orthographic projection of the third mirror on the horizontal reference plane overlaps with the orthographic projection of the sixth mirror on the horizontal reference plane.

[0026] In some embodiments, the second dichroic mirror is disposed on a side of the first dichroic mirror away from the red laser chip set;

[0027] The orthographic projections of the first dichroic mirror and the second dichroic mirror on the horizontal reference plane both cover the orthographic projection of the red laser chip set on the horizontal reference plane.

[0028] In some embodiments, the second mirror, the third mirror, the fifth mirror, and the sixth mirror are all perpendicular to the horizontal reference plane and are all at an angle of 45° to the vertical reference plane; the vertical reference plane is perpendicular to the horizontal reference plane; the first mirror, the fourth mirror, the first dichroic mirror, and the second dichroic mirror are all perpendicular to the vertical reference plane and are all at an angle of 45° to the horizontal reference plane;

[0029] The extension plane of the reflecting surface of the first mirror and the extension plane of the reflecting surface of the fourth mirror are parallel to each other; the extension plane of the reflecting surface of the first dichroic mirror and the extension plane of the reflecting surface of the second dichroic mirror are parallel to each other; the extension plane of the reflecting surface of the second mirror and the extension plane of the reflecting surface of the third mirror are perpendicular to each other; the extension plane of the reflecting surface of the fifth mirror and the extension plane of the reflecting surface of the sixth mirror are perpendicular to each other; the extension plane of the reflecting surface of the first dichroic mirror is perpendicular to the extension plane of the reflecting surface of the first mirror, and the extension plane of the reflecting surface of the second dichroic mirror is perpendicular to the extension plane of the reflecting surface of the fourth mirror.

[0030] In some embodiments, the first lens assembly includes a diffuser, a first beam expander lens, and a second beam expander lens; the line connecting the centers of the first beam expander lens, the second beam expander lens, and the diffuser is coaxial with the optical axis of the laser beam.

[0031] The diffuser is configured to diffuse the laser beam from the laser light source assembly and emit it to the first beam expander lens.

[0032] The first beam expander lens is configured to expand the exit angle of the laser beam.

[0033] The second beam expander lens is configured to collimate the laser beam with an expanded exit angle to form parallel light within a certain exit range.

[0034] In some embodiments, the second lens assembly includes a fly-eye lens group, a first focusing lens, a seventh mirror, and a second focusing lens.

[0035] The fly-eye lens group is configured to split the received laser beam into multiple sub-beams.

[0036] The first focusing lens is configured to refract the multiple sub-beams to the seventh mirror.

[0037] The seventh mirror is configured to reflect the multiple sub-beams to the second focusing lens.

[0038] The second focusing lens is configured to converge the multiple sub-beams to a preset range of the liquid crystal imaging assembly.

[0039] In some embodiments, the compound eye lens group includes a first compound eye lens and a second compound eye lens; the first compound eye lens includes a plurality of first microlenses arranged in an array, and the convex surface of the first microlens faces the beam expander lens group; the second compound eye lens includes a plurality of second microlenses arranged in an array, and the convex surface of the second microlens faces the first focusing lens; the first microlenses and the second microlenses are arranged in one-to-one correspondence, and the vertex of the first microlens is located at the focus of the corresponding second microlens.

[0040] In some embodiments, the liquid crystal imaging component includes an eighth reflector and a liquid crystal panel;

[0041] The eighth reflector is configured to receive the laser beam emitted from the second lens assembly and reflect the laser beam to the liquid crystal panel;

[0042] The liquid crystal panel is configured to modulate the received laser beam to generate a projection image. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of the liquid crystal projection device provided by an embodiment of the present disclosure.

[0044] Figure 2 It is an optical path diagram of the liquid crystal projection device provided by an embodiment of the present disclosure.

[0045] Figure 3 It is an optical path diagram of the laser light source module provided by an embodiment of the present disclosure.

[0046] Figure 4 It is a schematic diagram of the three-color laser provided by an embodiment of the present disclosure.

[0047] Figure 5 It is a front view of the laser light source module provided by an embodiment of the present disclosure.

[0048] Figure 6 It is a schematic diagram of the first lens assembly provided by an embodiment of the present disclosure.

[0049] Figure 7 It is a schematic diagram of the second lens assembly provided by an embodiment of the present disclosure

[0050] Figure 8a It is a schematic plan view of the compound eye lens group provided by an embodiment of the present disclosure.

[0051] Figure 8b It is a side view of the compound eye lens group provided by an embodiment of the present disclosure.

[0052] Figure 9 It is a schematic diagram of the surface illuminance of the liquid crystal panel provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part rather than all of the embodiments of the present disclosure. Components of the embodiments of the present disclosure usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but merely represents selected embodiments of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure.

[0054] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should have the ordinary meanings understood by those of ordinary skill in the field to which the present disclosure pertains. The "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "a", "an", or "the" do not denote a quantity limitation, but mean that there is at least one. Terms such as "include" or "comprise" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. Terms such as "connect" or "couple" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0055] As used in the present disclosure, "a plurality of" or "several" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0056] In the related art, traditional liquid crystal projectors mainly use white light-emitting diodes (LED lamps) as a single light source. The spectrum of the white light LED light source is a continuous spectrum within the visible light range. Therefore, when using a white light LED as the light source of a liquid crystal projection optical machine, there is a defect of a relatively low color gamut.

[0057] In view of this, embodiments of the present disclosure provide a liquid crystal projection device. Figure 1 It is a schematic structural diagram of the liquid crystal projection device provided by the embodiments of the present disclosure. Figure 2The optical path diagram of the liquid crystal projection device provided by the embodiments of the present disclosure is as follows Figure 1 and Figure 2 As shown, the liquid crystal projection device includes: a laser light source assembly 100, a first lens assembly 200, a second lens assembly 300, and a liquid crystal imaging assembly 400. Among them, the laser light source assembly 100 is used to generate lasers of multiple colors and combine the lasers of multiple colors into a single laser beam. The optical axes of the lasers of each color in the combined laser beam are coaxial. The first lens assembly 200 is used to expand the outgoing range of the laser beam to the second lens assembly 300. The second lens assembly 300 is used to converge the laser beam within the outgoing range to the liquid crystal imaging assembly 400. The liquid crystal imaging assembly 400 is used to modulate the received laser beam to generate a projection image.

[0058] Among them, the laser light source assembly 100 includes lasers for generating lasers of multiple different colors, such as a red laser 1011, a green laser 1012, and a blue laser 1013, etc. The red laser 1011 is used to generate red laser, the green laser 1012 is used to generate green laser, and the blue laser 1013 is used to generate blue laser. A laser can also be understood as a chip that generates laser, simply referred to as a laser chip. The laser light source assembly 100 can finally combine multiple laser beams of different colors into a single laser beam for outgoing. The optical axis of the finally combined single laser beam, that is, the optical axis of the laser of each color, forms a monochromatic laser. For example, red laser, green laser, and blue laser are combined into a single white laser. Of course, other colors of lasers can also be selected according to user needs to synthesize the required color, which is not limited in the present disclosure. It should be noted that Figure 2 only for the convenience of understanding, the optical paths of red laser, green laser, and blue laser are shown, but in actual situation, the three are combined into a single beam of light for outgoing, and the outgoing direction is the third direction Z.

[0059] Here, using laser as the projection illumination light, compared with ordinary light (such as LED or incandescent lamp), the laser spectrum has an extremely narrow bandwidth (highly single wavelength), which can increase the color gamut of the projection image to more than 100%. In addition, the laser propagates almost parallel, and its emission angle is extremely small, greatly improving the brightness of the projection image.

[0060] Due to the characteristics of the laser having a small light-emitting area and a small emission angle, in order to improve the brightness uniformity of the projection image, the first lens assembly 200 is set to expand the outgoing range of the laser beam to the light homogenizing projection assembly, that is, to expand the spot area of the entire outgoing laser beam, and further cooperate with the second lens assembly 300 to converge the laser beam to the liquid crystal imaging assembly 400, thereby improving the illuminance uniformity of the surface of the liquid crystal imaging assembly 400. Here, the laser outgoing range of the first lens assembly 200 is larger than the laser outgoing range of the laser light source assembly 100.

[0061] It can be seen that the liquid crystal projection device provided by the embodiments of the present disclosure can improve the color gamut of the projection screen to more than 100% by using laser as the projection illumination light compared with the existing monochromatic LCD optical engine. In addition, by utilizing the characteristic of the extremely small laser emission angle, the brightness of the projection screen is greatly improved. At the same time, in cooperation with the first lens assembly 200 and the second lens assembly 300, the brightness uniformity of the projection screen can be improved to more than 90%.

[0062] Figure 3 The following is the optical path diagram of the laser light source module provided by the embodiments of the present disclosure. It should be noted that Figure 3 only for the convenience of understanding, the optical paths of the red laser, the green laser, and the blue laser are schematically shown. In actual situations, the three are combined into a single beam of light for emission. Figure 4 The following is a schematic diagram of the three-color laser provided by the embodiments of the present disclosure. Figure 5 The following is a front view of the laser light source module provided by the embodiments of the present disclosure.

[0063] In some embodiments, as Figure 3 shown, the laser light source assembly 100 includes a three-color laser 11, a mirror group 12, and a dichroic mirror group 13; the lasers of multiple colors include a red laser, a green laser, and a blue laser; the optical axes of the red laser, the green laser, and the blue laser are coaxial.

[0064] Among them, the three-color laser 11 is used to generate a red laser, a green laser, and a blue laser. Optionally, the three-color laser 11 includes at least one red laser chip, at least one green laser chip, and at least one blue laser chip; the red laser chip is used to generate a red laser, the green laser chip is used to generate a green laser, and the blue laser chip is used to generate a blue laser. The laser chips of the three colors are located at different positions, and the orthographic projections of the red laser chip, the green laser chip, and the blue laser chip on the horizontal reference plane do not overlap.

[0065] The mirror group 12 is used to reflect the green laser to the first position D1 in the dichroic mirror group 13 and reflect the blue laser to the second position D2 in the dichroic mirror group 13. The orthographic projections of the first position D1 and the second position D2 on the horizontal reference plane overlap. Here, the mirror group 12 is used to reflect the green laser and the blue laser from different positions to two different positions on the same vertical emission axis to achieve the combination of the laser beams. The first position D1 is closer to the three-color laser 11 than the second position D2.

[0066] The dichroic mirror group 13 is configured to transmit the blue laser from the first position D1 and the second position D2, reflect the green laser from the second position D2, and transmit the red laser from the first position D1 and the second position D2. The dichroic mirror group 13 utilizes the transmission and reflection principle to transmit the laser incident from the surface close to the three-color laser 11 and reflect the laser incident from the surface far from the three-color laser 11, thereby ensuring the merging of the optical paths within a limited body space, realizing a small-volume liquid crystal projection device, improving the aesthetics, and meeting the user requirements.

[0067] In some embodiments, as Figure 4 shown, the three-color laser 11 includes a red laser 1011, a green laser 1012, and a blue laser 1013; the green laser 1012 and the blue laser 1013 are arranged side by side in the first direction X, and the red laser 1011 and the green laser 1012 are arranged side by side in the second direction Y; the red laser 1011 is configured to generate red laser and emit it in the third direction Z; the third direction Z, the first direction X, and the second direction Y are perpendicular to each other pairwise; the green laser 1012 is configured to generate green laser and emit it in the third direction Z; the blue laser is configured to generate blue laser and emit it in the third direction Z.

[0068] Optionally, the red laser 1011 includes a plurality of red laser chips (only 4 are schematically shown in FIG. 4), the green laser 1012 includes a plurality of green laser chips (only 2 are schematically shown in FIG. 4), and the blue laser 1013 includes a plurality of blue laser chips (only 3 are schematically shown in FIG. 4). Figure 4 The number of the schematically shown laser chips is not intended to limit the number of laser chips in the actual product of the present disclosure and can be adjusted as needed. The plurality of red laser chips are arranged side by side in the first direction X to form the red laser 1011; the plurality of green laser chips and the plurality of blue laser chips are arranged side by side in the first direction X to form the green laser 1012 and the blue laser 1013.

[0069] In addition to the laser chips, the laser further includes a bottom plate with an integrated circuit structure thereon. The bottom plate is a rectangular plate, and the bottom surface where it is located is a horizontal plane, serving as the horizontal reference plane of the present disclosure. The third direction Z is perpendicular to the horizontal reference plane.

[0070] In some embodiments, as Figure 3 and Figure 5As shown in the figure, the mirror group 12 includes a first mirror subgroup 121 and a second mirror subgroup 122; the first mirror subgroup 121 includes a first mirror 102, a second mirror 103, and a third mirror 104; the second mirror subgroup 122 includes a fourth mirror 105, a fifth mirror 106, and a sixth mirror 107; the dichroic mirror group 13 includes a first dichroic mirror 108 and a second dichroic mirror 109. Among them, the first mirror 102 is used to receive the blue laser emitted from the blue laser 1013 and reflect the blue laser to the second mirror 103; the second mirror 103 is used to reflect the blue laser to the third mirror 104, and the third mirror 104 is used to reflect the blue laser to the first position D1 in the first dichroic mirror 108; the fourth mirror 105 is used to receive the green laser emitted from the green laser 1012 and reflect the green laser to the fifth mirror 106; the fifth mirror 106 is used to reflect the green laser to the sixth mirror 107, and the sixth mirror 107 is used to reflect the green laser to the second position D2 of the second dichroic mirror 109; the first dichroic mirror 108 is used to reflect the blue laser to the second position D2 of the second dichroic mirror 109; and, receive the red laser emitted from the red laser chip group and transmit the red laser from the first position D1 to the second position D2 of the second dichroic mirror 109; the second dichroic mirror 109 is used to transmit the blue laser from the second position D2, reflect the green laser from the second position D2, and transmit the red laser from the second position D2.

[0071] In this embodiment, the three mirrors in the first mirror subgroup 121 reflect the blue laser three times to turn the optical path of the blue laser and ensure that the blue laser accurately enters the first position D1 of the first dichroic mirror 108, so as to achieve the coaxial output of the three-color laser. The three mirrors in the second mirror subgroup 122 reflect the green laser three times to turn the optical path of the green laser and ensure that the green laser accurately enters the second position D2 of the second dichroic mirror 109, so as to achieve the coaxial output of the three-color laser. The surfaces of the first dichroic mirror 108 and the second dichroic mirror 109 close to the three-color laser 11 are transmissive, and the surfaces far from the three-color laser 11 are reflective, so as to ensure the coaxial output of the three-color laser in a limited space.

[0072] Optionally, as Figure 3 and Figure 5As shown, the second reflector subgroup 122 is disposed on a side of the first reflector subgroup 121 away from the blue laser 1013 and the green laser 1012; the second dichroic mirror 109 is disposed on a side of the first dichroic mirror 108 away from the red laser chipset. In this way, the first reflector 102, the second reflector 103, the third reflector 104, and the first dichroic mirror 108 for reflecting blue laser are all located close to the three-color laser 11. The fourth reflector 105, the fifth reflector 106, the sixth reflector 107, and the second dichroic mirror 109 for reflecting green laser are all located away from the three-color laser 11. Thus, the double-layer structure is adopted to realize the reflection of blue laser and green laser, which can ensure the coaxial emission of three-color lasers within a limited space.

[0073] Optionally, as Figure 3 and Figure 5 shown, the orthographic projection of the first reflector 102 on the horizontal reference plane covers the orthographic projection of the blue laser 1013 on the horizontal reference plane, so as to fully receive all the blue laser emitted from the blue laser 1013. The orthographic projection of the fourth reflector 105 on the horizontal reference plane covers the orthographic projection of the green laser chip on the horizontal reference plane, so as to fully receive all the green laser emitted from the green laser 1012; the edge of the orthographic projection of the first reflector 102 on the horizontal reference plane is joined to the edge of the orthographic projection of the fourth reflector 105 on the horizontal reference plane, that is, the two do not overlap, so as to prevent the first reflector 102 from blocking the optical path of the blue laser to the third reflector 104.

[0074] Optionally, as Figure 3 and Figure 5 shown, the orthographic projection of the first reflector 102 on the first vertical reference plane overlaps with the orthographic projection of the second reflector 103 on the first vertical reference plane, so as to ensure that the second reflector 103 can receive the blue laser reflected from the first reflector 102; the orthographic projection of the fourth reflector 105 on the first vertical reference plane overlaps with the orthographic projection of the fifth reflector 106 on the first vertical reference plane, so that the fifth reflector 106 can receive the green laser reflected from the fourth reflector 105. Here, the first vertical reference plane is perpendicular to the horizontal reference plane. For example, the first vertical reference plane is the reference plane formed by the YZ direction.

[0075] Optionally, as Figure 3 and Figure 5As shown, the included angle between the extension plane of the reflecting surface of the first reflecting mirror 102 and the horizontal reference plane is an acute angle, so that the blue laser can be reflected to the second reflecting mirror 103; the included angle between the extension plane of the reflecting surface of the fourth reflecting mirror 105 and the horizontal reference plane is an acute angle, so that the green laser can be reflected to the fifth reflecting mirror 106. The included angle between the extension plane of the reflecting surface of the first reflecting mirror 102 and the horizontal reference plane is the same as the included angle between the extension plane of the reflecting surface of the fourth reflecting mirror 105 and the horizontal reference plane.

[0076] Optionally, as Figure 3 shown, the orthographic projection of the second reflecting mirror 103 on the horizontal reference plane overlaps with the orthographic projection of the fifth reflecting mirror 106 on the horizontal reference plane; the orthographic projection of the third reflecting mirror 104 on the horizontal reference plane overlaps with the orthographic projection of the sixth reflecting mirror 107 on the horizontal reference plane. In this way, the size of the laser light source module 100 in the first direction X can be saved within a limited structural space, which is beneficial to realizing a small-sized laser light source module 100.

[0077] Optionally, as Figure 3 and Figure 5 shown, the orthographic projection of the second reflecting mirror 103 on the second vertical reference plane (such as the reference plane formed by the XZ direction and perpendicular to the horizontal reference plane) overlaps with the orthographic projection of the third reflecting mirror 104 on the second vertical reference plane, so as to ensure that the third reflecting mirror 104 can receive the blue laser reflected by the second reflecting mirror 103; the orthographic projection of the fifth reflecting mirror 106 on the second vertical reference plane overlaps with the orthographic projection of the sixth reflecting mirror 107 on the second vertical reference plane, so as to ensure that the sixth reflecting mirror 107 can receive the green laser reflected by the fifth reflecting mirror 106. The connecting line between the centers of the second reflecting mirror 103 and the third reflecting mirror 104 is parallel to the horizontal reference plane. The connecting line between the centers of the fifth reflecting mirror 106 and the sixth reflecting mirror 107 is parallel to the horizontal reference plane.

[0078] Optionally, as Figure 3 shown, the orthographic projections of the first dichroic mirror 108 and the second dichroic mirror 109 on the horizontal reference plane both cover the orthographic projection of the red laser chip set on the horizontal reference plane, so as to fully receive all the red lasers emitted by the red laser 1011. The orthographic projection of the first dichroic mirror 108 on the second vertical reference plane overlaps with the orthographic projection of the third reflecting mirror 104 on the second vertical reference plane, so as to ensure that the first dichroic mirror 108 can receive the blue laser reflected by the third reflecting mirror 104. The orthographic projection of the second dichroic mirror 109 on the second vertical reference plane overlaps with the orthographic projection of the sixth reflecting mirror 107 on the second vertical reference plane, so as to ensure that the second dichroic mirror 109 can receive the green laser reflected by the sixth reflecting mirror 107.

[0079] Exemplarily, as Figure 3 andFigure 5 As shown, the second mirror 103, the third mirror 104, the fifth mirror 106 and the sixth mirror 107 are all perpendicular to the horizontal reference plane, and are all at an angle of 45° with the vertical reference plane (such as the second vertical reference plane in the XZ direction); the second vertical reference plane is perpendicular to the horizontal reference plane; the first mirror 102, the fourth mirror 105, the first dichroic mirror 108 and the second dichroic mirror 109 are all perpendicular to the second vertical reference plane, and are all at an angle of 45° with the horizontal reference plane; the extension plane of the reflecting surface of the first mirror 102 and the extension plane of the reflecting surface of the fourth mirror 105 are parallel to each other; the extension plane of the reflecting surface of the first dichroic mirror 108 and the extension plane of the reflecting surface of the second dichroic mirror are parallel to each other; the extension plane of the reflecting surface of the second mirror 103 and the extension plane of the reflecting surface of the third mirror 104 are perpendicular to each other; the extension plane of the reflecting surface of the fifth mirror 106 and the extension plane of the reflecting surface of the sixth mirror 107 are perpendicular to each other; the extension plane of the reflecting surface of the first dichroic mirror 108 and the extension plane of the reflecting surface of the first mirror 102 are perpendicular to each other, and the extension plane of the reflecting surface of the second dichroic mirror 109 and the extension plane of the reflecting surface of the fourth mirror 105 are perpendicular to each other.

[0080] Exemplarily, the first mirror 102, the second mirror 103, the third mirror 104, the fourth mirror 105, the fifth mirror 106 and the sixth mirror 107 are all rectangular plane mirrors. In order to prevent the first mirror 102 from blocking the optical path of the blue laser to the third mirror 104, one end of the first mirror 102 close to the blue laser 1013 is vertically chamfered, and the extension plane of its cut surface is at an angle of 45° with the reflecting surface of the fourth mirror 105, and the positive projection of the cut surface on the horizontal reference plane overlaps with one end of the fourth mirror 105 far from the green laser 1012.

[0081] In some embodiments, Figure 6 is a schematic diagram of the first lens assembly provided by the embodiments of the present disclosure. As Figure 6 shown, the first lens assembly 200 includes a diffuser 201, a first beam expander lens 202 and a second beam expander lens 203; the connection line of the centers of the first beam expander lens 202, the second beam expander lens 203 and the diffuser 201 is coaxial with the optical axis of the laser beam. The extension direction of the connection line of the centers of the first beam expander lens 202, the second beam expander lens 203 and the diffuser 201 is the third direction Z.

[0082] The diffuser 201 is used to diffuse the laser beam from the laser light source assembly 100 and emit it to the first beam expander lens 202. Here, the diffuser 201 expands the angle of the laser beam for the first time, which can make the illuminance on the surface of the liquid crystal imaging assembly 400 more uniform when irradiated finally, and weaken the speckle phenomenon of the projection image. Optionally, the diffuser 201 is a rectangular flat diffuser 201, located in the light-emitting direction of the laser light source assembly 100; the extension plane of the light incident surface of the diffuser 201 forms a 45° angle with the extension plane of the reflection surface of the second dichroic mirror 109. The distance between the center of the diffuser 201 and the center of the second dichroic mirror 109 is between 3-6 mm. The surface of the diffuser 201 close to the first beam expander lens 202 is the diffusing surface.

[0083] The first beam expander lens 202 is used to expand the exit angle of the laser beam. Here, the first beam expander lens 202 diffuses the light rays of the laser beam for the second time. Optionally, the first beam expander lens 202 is a double-concave spherical lens, and the two concave surface curvatures are the same, and the range of the surface curvature radius is between 12-15 mm. The diameter range of the first beam expander lens 202 is between 9-12 mm. Here, the diameter of the first beam expander lens 202 refers to the straight-line distance at the widest part between the two optical surfaces (concave surfaces) of the lens. The center thickness range of the first beam expander lens 202 is between 2-3 mm. Here, the center thickness of the first beam expander lens 202 refers to the shortest straight-line distance between the two concave surface vertices of the lens, that is, the thickness from the front surface vertex to the rear surface vertex along the optical axis (central axis).

[0084] The second beam expander lens 203 is used to collimate the laser beam with an expanded exit angle to form parallel light with a certain exit range. Optionally, the second beam expander lens 203 is a plano-convex lens. The surface of the second beam expander lens 203 close to the first beam expander lens 202 is a plane, and the surface far from the first beam expander lens 202 is a convex surface (or spherical surface). The range of the spherical radius is between 11-15 mm. Here, the spherical radius refers to the straight-line distance from its convex spherical vertex (vertex curvature center) to the spherical curvature center. The diameter range of the second beam expander lens 203 is between 20-24 mm. Here, the diameter of the plano-convex lens refers to the maximum lateral width of its optical light-passing area. The center thickness range of the second beam expander lens 203 is between 8-10 mm. Here, the center thickness of the plano-convex lens refers to the vertical distance from the optical surface on the plane side to the vertex on the convex side, that is, the thickness at the thickest part measured along the optical axis (central axis).

[0085] In this embodiment, through the cooperation of the diffuser 201, the first beam expander lens 202 and the second beam expander lens 203, the three-color laser beam can be expanded, so that the spot incident on the light homogenizing lens group is enlarged, thereby improving the illuminance uniformity of the surface of the liquid crystal imaging assembly 400.

[0086] In some embodiments,Figure 7 Schematic diagram of the second lens assembly provided by an embodiment of the present disclosure, as Figure 7 shown, the second lens assembly 300 includes a compound eye lens group 30, a first focusing lens 303, a seventh mirror 304, and a second focusing lens 305.

[0087] The compound eye lens group 30 is used to split the received laser beam into multiple sub-beams, which is beneficial to uniform the illuminance on the surface of the liquid crystal forming assembly and avoid the generation of hot spots.

[0088] Optionally, Figure 8a Planar schematic diagram of the compound eye lens group provided by an embodiment of the present disclosure, Figure 8b Side view of the compound eye lens group provided by an embodiment of the present disclosure, as Figure 8a and Figure 8b shown, the compound eye lens group 30 includes a first compound eye lens 301 and a second compound eye lens 302; the first compound eye lens 301 includes a first plane 301a and a first compound eye surface 301b that are oppositely arranged along its thickness direction; the second compound eye lens 302 includes a second plane 302a and a second compound eye surface 302b that are oppositely arranged along its thickness direction; the first plane 301a and the second plane 302a are oppositely arranged. The first compound eye lens 301 includes a plurality of first microlenses 3011 arranged in an array, and the convex surface of the first microlenses 3011 is close to the beam expander lens group; the convex surfaces of the plurality of first microlenses 3011 arranged in an array constitute the first compound eye surface 301b. The second compound eye lens 302 includes a plurality of second microlenses 3021 arranged in an array, and the convex surface of the second microlenses 3021 is close to the first focusing lens 303; the convex surfaces of the plurality of second microlenses 3021 arranged in an array constitute the second compound eye surface 302b. The laser beam can be evenly split into multiple sub-beams by using the first microlenses 3011, so as to achieve a uniform light effect.

[0089] Optionally, the first microlenses 3011 and the second microlenses 3021 are arranged in one-to-one correspondence, and the vertex of the first microlenses 3011 is located at the focus of the corresponding second microlenses 3021, so that it can be ensured that the sub-beams split by the first microlenses 3011 can be accurately recombined after passing through the second microlenses 3021, avoiding light energy loss. In this embodiment, through two compound eye splits (the first compound eye lens 301 splits the incident laser beam, and the second compound eye lens 302 integrates the sub-beams), the non-uniformity of the laser beam (such as laser speckle, etc.) can be effectively eliminated, and uniform illumination is formed on the surface of the liquid crystal imaging assembly 400.

[0090] Optionally, the first compound eye lens 301 and the second compound eye lens 302 have the same specifications, dimensions, and optical surface types. The outer contour of the first microlenses 3011 is rectangular, and the aspect ratio of the length to the width of the first microlenses 3011 is 16:9. The outer contour of the second microlenses 3021 is rectangular, and the aspect ratio of the length to the width of the second microlenses 3021 is 16:9.

[0091] Optionally, the outer contours of the first compound eye lens 301 and the second compound eye lens 302 are both rectangular.

[0092] Optionally, the orthographic projection of the first compound eye lens 301 on the horizontal reference plane overlaps with the orthographic projection of the second compound eye lens 302 on the horizontal reference plane.

[0093] Optionally, the orthographic projection of the first compound eye lens 301 on the horizontal reference plane covers the orthographic projection of the second beam expander lens 203 on the horizontal reference plane. In this way, the first compound eye lens 301 can receive all the collimated parallel light emitted from the second beam expander lens 203. For example, the centers of the first compound eye lens 301, the second compound eye lens 302, and the second beam expander lens 203 are coaxial, and the side lengths of the first compound eye lens 301 and the second compound eye lens 302 are both greater than the diameter of the second beam expander lens 203.

[0094] Optionally, the line connecting the centers of the first compound eye lens 301 and the second compound eye lens 302 is coaxial with the line connecting the centers of the first beam expander lens 202, the second beam expander lens 203, and the diffuser 201, that is, coaxial with the optical axis of the laser beam.

[0095] The first focusing lens 303 is used to refract multiple sub-beams to the seventh mirror 304; the seventh mirror 304 is used to reflect the multiple sub-beams to the second focusing lens 305; the second focusing lens 305 is used to converge the multiple sub-beams to a preset range of the liquid crystal imaging component 400.

[0096] The first focusing lens 303 and the second focusing lens 305 are jointly used to converge multiple sub-beams. The seventh mirror 304 is located between the optical paths of the first focusing lens 303 and the second focusing lens 305 and is used for the optical path turning of the sub-beams, which is beneficial to realizing a liquid crystal projection device with a small volume, improving the aesthetics, and meeting the user's needs.

[0097] Exemplarily, the first focusing lens 303 and the second focusing lens 305 can be selected but are not limited to plano-convex lenses. The plane of the first focusing lens 303 is close to the compound eye lens group 30, the convex surface of the first focusing lens 303 is close to the seventh reflector 304, the plane of the second focusing lens 305 is close to the seventh reflector 304, and the convex surface of the second focusing lens 305 is close to the liquid crystal imaging component 400. The spherical radius of the first focusing lens 303 ranges between 45 - 55 mm, the diameter of the first focusing lens 303 ranges between 25 - 35 mm, and the central thickness of the first focusing lens 303 ranges between 3.5 - 4.5 mm. The line connecting the center of the first focusing lens 303 and the center of the first compound eye lens 301 is coaxial with the line connecting the centers of the first beam expander lens 202, the second beam expander lens 203, and the diffuser 201, that is, coaxial with the optical axis of the laser beam. The perpendicular distance from the vertex of the sagitta height of the second microlens 3021 to the plane of the first focusing lens 303 ranges between 10 - 16 mm. The planes of the first focusing lens 303 and the second focusing lens 305 are perpendicular to each other. The seventh reflector 304 can be a plane mirror. Of course, the seventh reflector 304 in the present disclosure is not limited to a plane mirror, and a curved mirror can also be selected. The extension plane of the reflecting surface of the seventh reflector 304 forms a 45° angle with the extension plane of the plane of the first focusing lens 303. The side length dimension of the seventh reflector 304 is larger than the diameter of the first focusing lens 303. The perpendicular distance from the center of the reflecting surface of the seventh reflector 304 to the plane of the first focusing lens 303 ranges between 16 - 22. The spherical radius of the second focusing lens 305 ranges between 75 - 85 mm, the diameter of the second focusing lens 305 ranges between 40 - 50 mm, and the central thickness of the second focusing lens 305 ranges between 7 - 9 mm. The perpendicular distance from the plane of the second focusing lens 305 to the combination center of the reflecting surface of the seventh reflector 304 ranges between 28 - 34 mm.

[0098] In this embodiment, the compound eye lens group 30 divides the laser beam into multiple fine sub-beams and converges the multiple fine sub-beams onto the surface of the liquid crystal imaging component 400, as Figure 9 shown, to form a rectangle with uniform illuminance.

[0099] In some embodiments, as Figure 7 shown, the liquid crystal imaging component 400 includes an eighth reflector 401 and a liquid crystal panel 402; the eighth reflector 401 is used to receive the laser beam emitted from the second lens assembly 300, and this laser beam is a larger area uniform light spot formed by combining multiple fine sub-beams. And it reflects the laser beam to the liquid crystal panel 402.

[0100] The liquid crystal panel 402 is used to modulate the received laser beam to generate a projection image. Optionally, the liquid crystal panel 402 at least includes a polarizer (not shown in the figure) and a liquid crystal layer (not shown in the figure). The laser beam reflected by the eighth mirror 401 hits the polarizer, and the polarizer is used to change the polarization direction of the laser beam so that it meets the light with a specific polarization direction that can be modulated by the liquid crystal molecules. After being modulated by the liquid crystal layer, a projection image is formed.

[0101] Optionally, the surface of the liquid crystal panel 402 irradiated by the laser beam is located at or near the focal plane position of the combination of the first focusing lens 303 and the second focusing lens 305, such as the surface of the liquid crystal panel 402 irradiated by the laser beam is within a distance range of ±5% of the focal length of the combination of the first focusing lens 303 and the second focusing lens 305. In this way, the clarity of the projection image can be ensured, aberration can be eliminated, brightness can be uniform, light efficiency can be maximized, and the calibration of the optical system can be simplified.

[0102] Exemplarily, the eighth mirror 401 can be selected but not limited to a plane mirror. The extension plane of the reflecting surface of the eighth mirror 401 and the extension plane of the light-emitting surface of the liquid crystal panel 402 form a 45° angle. The distance range from the center of the reflecting surface of the eighth mirror 401 to the vertex of the sagitta height of the second focusing lens 305 is between 12 - 20 mm.

[0103] Optionally, the liquid crystal panel 402 is located between the end of the eighth mirror 401 away from the second focusing lens 305 and the second focusing lens 305. The extension direction of the line connecting the centers of the liquid crystal panel 402 and the eighth mirror 401 is the third direction Z.

[0104] Exemplarily, the liquid crystal panel 402, such as a liquid crystal light valve, displays a projection image. Its outer contour is rectangular, and the aspect ratio is 16:9. The line connecting the centers of the liquid crystal panel 402 and the eighth mirror 401 is parallel to the line connecting the centers of the first beam expander lens 202, the second beam expander lens 203, and the diffuser 201. The distance range from the center of the liquid crystal panel 402 to the center of the eighth mirror 401 is between 15 - 25 mm.

[0105] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various variations and improvements can be made without departing from the spirit and essence of the present disclosure, and these variations and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A liquid crystal projection device, characterized in that, Comprising: A laser light source assembly, a first lens assembly, a second lens assembly, and a liquid crystal imaging assembly; The laser light source assembly is configured to generate lasers of multiple colors and combine the lasers of multiple colors into a laser beam; the optical axes of the lasers of each color in the combined laser beam are coaxial; The first lens assembly is configured to expand the outgoing range of the laser beam to the second lens assembly; The second lens assembly is configured to converge the laser beam within the outgoing range to the liquid crystal imaging assembly; The liquid crystal imaging assembly is configured to modulate the received laser beam to generate a projection image.

2. The liquid crystal projection device according to claim 1, wherein The laser light source assembly includes a three-color laser, a mirror group, and a dichroic mirror group; the lasers of multiple colors include red laser, green laser, and blue laser; the optical axes of the red laser, the green laser, and the blue laser are coaxial; The three-color laser is configured to generate the red laser, the green laser, and the blue laser; The mirror group is configured to reflect the green laser to a first position in the dichroic mirror group and reflect the blue laser to a second position in the dichroic mirror group; the orthographic projections of the first position and the second position on a horizontal reference plane overlap; The dichroic mirror group is configured to transmit the blue laser from the first position and the second position, reflect the green laser from the second position, and transmit the red laser from the first position and the second position.

3. The liquid crystal projection device according to claim 2, wherein The three-color laser includes a red laser, a green laser, and a blue laser; the green laser and the blue laser are arranged side by side in a first direction, and the red laser and the green laser are arranged side by side in a second direction; The red laser is configured to generate the red laser and emit it in a third direction; the third direction, the first direction, and the second direction are perpendicular to each other in pairs; The green laser is configured to generate the green laser and emit it in the third direction; The blue laser is configured to generate blue laser and emit it in the third direction.

4. The liquid crystal projection device according to claim 3, wherein, The mirror group includes a first mirror sub-group and a second mirror sub-group; the first mirror sub-group includes a first mirror, a second mirror, and a third mirror; the second mirror sub-group includes a fourth mirror, a fifth mirror, and a sixth mirror; the dichroic mirror group includes a first dichroic mirror and a second dichroic mirror; The first mirror is configured to receive the blue laser emitted from the blue laser and reflect the blue laser to the second mirror; the second mirror is configured to reflect the blue laser to the third mirror, and the third mirror is configured to reflect the blue laser to the first position in the first dichroic mirror; The fourth mirror is configured to receive the green laser emitted from the green laser and reflect the green laser to the fifth mirror; The fifth mirror is configured to reflect the green laser to the sixth mirror, and the sixth mirror is configured to reflect the green laser to the second position in the second dichroic mirror; The first dichroic mirror is configured to reflect the blue laser to the second position of the second dichroic mirror; and, receive the red laser emitted from the red laser chipset and transmit the red laser from the first position to the second position of the second dichroic mirror; The second dichroic mirror is configured to transmit the blue laser from the second position, reflect the green laser from the second position, and transmit the red laser from the second position.

5. The liquid crystal projection device according to claim 4, wherein The second reflector subgroup is disposed on a side of the first reflector subgroup away from the blue laser and the green laser; The orthographic projection of the first reflector on the horizontal reference plane covers the orthographic projection of the blue laser on the horizontal reference plane; the orthographic projection of the fourth reflector on the horizontal reference plane covers the orthographic projection of the green laser chip on the horizontal reference plane; the edge of the orthographic projection of the first reflector on the horizontal reference plane is in contact with the edge of the orthographic projection of the fourth reflector on the horizontal reference plane; The angle between the extension plane of the reflecting surface of the first reflector and the horizontal reference plane is an acute angle; the angle between the extension plane of the reflecting surface of the fourth reflector and the horizontal reference plane is an acute angle.

6. The liquid crystal projection apparatus according to claim 4, wherein The orthographic projection of the second reflector on the horizontal reference plane overlaps with the orthographic projection of the fifth reflector on the horizontal reference plane; the orthographic projection of the third reflector on the horizontal reference plane overlaps with the orthographic projection of the sixth reflector on the horizontal reference plane.

7. The liquid crystal projection apparatus according to claim 4, wherein, The second dichroic mirror is disposed on a side of the first dichroic mirror away from the red laser chipset; The orthographic projections of the first dichroic mirror and the second dichroic mirror on the horizontal reference plane both cover the orthographic projection of the red laser chipset on the horizontal reference plane.

8. The liquid crystal projection device according to claim 4, characterized in that, The second reflector, the third reflector, the fifth reflector, and the sixth reflector are all perpendicular to the horizontal reference plane and are all at an angle of 45° with respect to the vertical reference plane; the vertical reference plane is perpendicular to the horizontal reference plane; the first reflector, the fourth reflector, the first dichroic mirror, and the second dichroic mirror are all perpendicular to the vertical reference plane and are all at an angle of 45° with respect to the horizontal reference plane; The extension planes of the reflecting surfaces of the first reflector and the fourth reflector are parallel to each other; the extension planes of the reflecting surfaces of the first dichroic mirror and the second dichroic mirror are parallel to each other; the extension planes of the reflecting surfaces of the second reflector and the third reflector are perpendicular to each other; the extension planes of the reflecting surfaces of the fifth reflector and the sixth reflector are perpendicular to each other; the extension plane of the reflecting surface of the first dichroic mirror is perpendicular to the extension plane of the reflecting surface of the first reflector, and the extension plane of the reflecting surface of the second dichroic mirror is perpendicular to the extension plane of the reflecting surface of the fourth reflector.

9. The liquid crystal projection apparatus according to claim 1, wherein, The first lens assembly includes a diffuser, a first beam expander lens, and a second beam expander lens; the line connecting the centers of the first beam expander lens, the second beam expander lens, and the diffuser is coaxial with the optical axis of the laser beam; The diffuser is configured to diffuse the laser beam from the laser light source assembly and emit it to the first beam expander lens; The first beam expander lens is configured to expand the exit angle of the laser beam; The second beam expander lens is configured to collimate the laser beam with an expanded exit angle to form parallel light within a certain exit range.

10. The liquid crystal projection device according to claim 1, wherein The second lens assembly includes a fly-eye lens group, a first focusing lens, a seventh reflector, and a second focusing lens; The fly-eye lens group is configured to split the received laser beam into multiple sub-beams; The first focusing lens is configured to refract the multiple sub-beams to the seventh reflector; The seventh reflector is configured to reflect the multiple sub-beams to the second focusing lens; The second focusing lens is configured to converge the multiple sub-beams to a preset range of the liquid crystal imaging assembly.

11. The liquid crystal projection device according to claim 10, wherein The fly-eye lens group includes a first fly-eye lens and a second fly-eye lens; the first fly-eye lens includes a plurality of first microlenses arranged in an array, and the convex surface of the first microlens faces the beam expander lens group; the second fly-eye lens includes a plurality of second microlenses arranged in an array, and the convex surface of the second microlens faces the first focusing lens; the first microlenses and the second microlenses are arranged in one-to-one correspondence, and the vertex of the first microlens is located at the focal point of the corresponding second microlens.

12. The liquid crystal projection apparatus according to claim 1, wherein The liquid crystal imaging assembly includes an eighth reflector and a liquid crystal panel; The eighth reflector is configured to receive the laser beam emitted from the second lens assembly and reflect the laser beam to the liquid crystal panel; The liquid crystal panel is configured to modulate the received laser beam to generate a projection image.

Images