Projection equipment and projection system

Abstract

The embodiment of the utility model provides projection equipment and a projection system, relates to the technical field of laser projection, and is used for improving the projection effect of the projection equipment. The projection equipment comprises a light cup which comprises a light inlet and a light outlet which are arranged back to back; the light combination prism comprises a plurality of light inlet surfaces and a light outlet surface, and each light inlet surface is arranged opposite to the light outlet of the corresponding light cup; the light cup comprises a light cup main body, the light adjusting parts are located on the outer side of the light cup body, the light adjusting parts are sequentially arranged in the circumferential direction of the light cup body, and the light adjusting parts extend from a light inlet of the light cup to a light outlet of the light cup; the light adjusting part is configured to adjust the transmission path of light in the light cup, so that the incident angle of at least part of the light entering the light entering face of the light combining prism becomes smaller. The projection equipment is used for projecting and displaying images.

Description

Technical Field

[0001] The present disclosure relates to the field of laser projection technology, and in particular to a projection device and a projection system. Background Art

[0002] With the development of laser projection technology, projection equipment has gradually entered people's lives and become an indispensable item in people's work and life.

[0003] However, in actual user applications, the problem of poor display effect still occurs, thus affecting the user's viewing experience. Utility Model Content

[0004] The purpose of the embodiments of the present disclosure is to provide a projection device and a projection system, so as to improve the projection effect of the projection device.

[0005] To achieve the above objectives, the embodiments of the present disclosure provide the following technical solutions:

[0006] On the one hand, a projection device is provided. The projection device includes a light cup and a light combining prism. The light cup includes a light inlet and a light outlet arranged opposite to each other. The light combining prism includes a plurality of light inlet surfaces and a light outlet surface, and one of the light inlet surfaces is arranged opposite to a light outlet of the light cup. The light cup includes: a light cup body; a plurality of dimming parts located outside the light cup body, the plurality of dimming parts are arranged in sequence along the circumference of the light cup body, and the dimming parts extend from the light inlet of the light cup to the light outlet; the dimming part is configured to: adjust the transmission path of the light in the light cup so that the incident angle of at least part of the light incident on the light inlet surface of the light combining prism becomes smaller.

[0007] In the above-mentioned projection device, the transmission path of the light in the light cup is adjusted by means of multiple dimming parts located on the outside of the light cup body, so that the incident angle of at least part of the light incident on the light incident surface of the light combining prism is smaller, thereby improving the problem that some large-angle incident light cannot pass through due to the weakening of the film system effect, thereby improving the transmittance of the light and improving the projection effect of the projection device.

[0008] In some embodiments, in a first direction, the cross-sectional shape of the dimming portion is an isosceles right triangle; wherein the first direction is a direction perpendicular to the light entrance of the optical cup and pointing to the light exit.

[0009] In some embodiments, the dimming part includes: a first side surface, a second side surface, and a third side surface that are connected in sequence, the third side surface is connected to the optical cup body; and the first side surface and the second side surface are curved surfaces.

[0010] In some embodiments, along the second direction, the curvature of the first side surface gradually increases; and / or the curvature of the second side surface gradually increases; wherein the second direction is: the direction in which the light entrance of the optical cup points to the light exit.

[0011] In some embodiments, the range of the radius of curvature of the first side surface is 37 mm to 128 mm; the range of the radius of curvature of the second side surface is 37 mm to 128 mm.

[0012] In some embodiments, along the circumference of the optical cup body, the distances between any two adjacent dimming parts are equal or substantially equal.

[0013] In some embodiments, the plurality of dimming parts are integrated with the optical cup body.

[0014] In some embodiments, the optical cup body is a plastic optical cup; and / or, the optical cup body is a transmissive optical cup.

[0015] In some embodiments, the color combining prism includes a plurality of rectangular light incident surfaces and a rectangular light emitting surface, and the plurality of light incident surfaces and the light emitting surface are sequentially connected to form a column, and one of the plurality of light incident surfaces is disposed opposite to the light emitting surface, and the distance from the light emitting surface to the light incident surface disposed opposite to each other is equal to the size of the short side of the rectangle.

[0016] In some embodiments, the light-combining prism is composed of four triangular prisms, each of which includes two end faces arranged opposite to each other, each end face is an isosceles triangle, and the length of the base of the isosceles triangle is less than the distance between the two end faces.

[0017] In another aspect, a projection system is provided, comprising: a projection device as described in any one of the above embodiments; and a projection screen located at a light emitting side of the projection device.

[0018] The above-mentioned projection system has the same structure and beneficial technical effects as the projection devices provided in some of the above-mentioned embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments of the present disclosure.

[0020] Figure 1is a structural diagram of a projection system according to some embodiments;

[0021] Figure 2 is a structural diagram of a projection device according to some embodiments;

[0022] Figure 3 is a structural diagram of an optical cup according to some embodiments;

[0023] Figure 4 is a structural diagram of another projection device according to some embodiments;

[0024] Figure 5 is a structural diagram of yet another projection device according to some embodiments;

[0025] Figure 6 is a structural diagram of another optical cup according to some embodiments;

[0026] Figure 7 is a structural diagram of another optical cup according to some embodiments;

[0027] Figure 8 is a structural diagram of another optical cup according to some embodiments;

[0028] Fig. 9 is a test chart of the reflectivity of the optical cup body to light of different wavelength bands according to some embodiments;

[0029] Fig.10 is a structural diagram of yet another projection device according to some embodiments. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0031] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

[0032] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0033] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0034] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0035] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [a stated condition or event] is detected" are optionally interpreted to mean "upon determining that" or "in response to determining that" or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0036] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0037] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0038] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0039] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0040] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0041] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0042] Figure 1 FIG. 4 is a structural diagram of a projection system according to some embodiments. Figure 1 As shown, the projection system 1 includes a projection device 1000 and a projection screen 2000. The projection screen 2000 is located at the light-emitting side of the projection device 1000, and the audience faces the projection screen 2000. After the projection light beam emitted from the projection device 1000 is incident on the projection screen 2000, it is reflected by the projection screen 2000 and enters the human eye, so that the audience can see the projected picture.

[0043] Exemplarily, the projection device 1000 may be a three-chip LCD (liquid crystal display) projection device.

[0044] It should be noted that three-chip LCD projection equipment uses three monochrome LCD sheets to decompose and adjust the color of the light source. Therefore, three-chip LCD projection equipment has good color reproduction performance and high contrast, and can accurately restore the three primary colors of RGB (red / green / blue), making the projected image color more vivid and rich, providing users with more realistic and clear images. Compared with single-chip LCD projection equipment, three-chip LCD projection equipment can achieve higher brightness and better projection effects.

[0045] In some embodiments, Figure 2 As shown, some embodiments of the present disclosure provide a projection device 1000. Figure 2 As shown, the projection device 1000 includes: a light cup 10 and a light combining prism 20 .

[0046] Among them, combined Figure 2 to Figure 4 As shown, the optical cup 10 includes a light inlet 10a and a light outlet 10b disposed opposite to each other. The light combining prism 20 includes a plurality of light inlet surfaces 20a and a light outlet surface 20b, and one light inlet surface 20a is disposed opposite to a light outlet 10b of the optical cup 10 .

[0047] Exemplary, combined Figure 2 and Figure 3 As shown, there are three optical cups 10. The light combining prism 20 includes three light incident surfaces 20a. The light outlet 10b of one optical cup 10 and one light incident surface 20a of the light combining prism 20 are arranged opposite to each other.

[0048] In some examples, the projection device 1000 further includes: a plurality of light sources, a light source and a light cup 10 are arranged opposite to each other, and the light cup 10 is located at the light output side of the light source. Among them, the light inlet 10a of the light cup 10 is closer to the light source. The plurality of light sources are used to provide illumination beams (such as lasers), and the illumination beams emitted by the light sources enter the interior of the light cup 10 through the light inlet 10a of the light cup 10.

[0049] Exemplarily, the light source may be at least one of an LED light source and a laser light source.

[0050] In addition, the light source may be a light source array, which includes a plurality of evenly distributed light emitters. Taking an LED light source as an example, the light source may include a plurality of groups of evenly distributed LED light sources, and of course may also include other numbers of LED light sources, each group of LED light sources may include one or more LEDs, and the embodiments of the present disclosure are not limited to this.

[0051] Exemplarily, the light source is a monochromatic light source. For example, the multiple light sources are: a blue light source, a red light source, a green light source, etc. Among them, the blue light source is used to emit a blue illumination beam; the red light source is used to emit a red illumination beam; and the green light source is used to emit a green illumination beam.

[0052] Exemplarily, when the number of the optical cups 10 is three, the number of the above light sources is also three. The three light sources can emit a first light beam, a second light beam, and a third light beam, respectively. The color of the first light beam, the color of the second light beam, and the color of the third light beam are red, blue, or green, respectively. For example, the color of the first light beam is red, the color of the second light beam is green, and the color of the third light beam is blue, or the color of the first light beam is red, the color of the second light beam is blue, and the color of the third light beam is green. The embodiments of the present disclosure are not limited to this.

[0053] The illumination light beam emitted by the light source is converged by the optical cup 10 and then incident on the light incident surface 20a of the light combining prism 20. Among the illumination light beams emitted by the light source, part of the illumination light beam is incident on the inside of the optical cup 10 from the light inlet 10a, then incident on the inner wall surface of the optical cup 10, and then incident on the light combining prism 20 after being reflected by the optical cup 10; part of the illumination light beam is incident on the inside of the optical cup 10 from the light inlet 10a, then directly passes through the light outlet 10b, and is incident on the light combining prism 20.

[0054] In some examples, the projection device 1000 further includes: a plurality of optical modulation modules. One optical modulation module is disposed at the light outlet 10 b of one optical cup 10 , and the optical modulation module is located between the optical cup 10 and the light combining prism 20 .

[0055] For example, the light inlet 10 a of the optical cup 10 faces the light source, and the light outlet 10 b of the optical cup 10 faces the optical modulation module.

[0056] Exemplarily, when the number of optical cups 10 is three, the number of optical modulation modules is also three. After being emitted from the optical cup 10, the first light beam, the second light beam, and the third light beam are incident on the plurality of optical modulation modules in a non-imaging manner. The plurality of optical modulation modules are used to modulate the first light beam, the second light beam, and the third light beam emitted by the plurality of light sources into the first image light, the second image light, and the third image light, respectively.

[0057] Exemplarily, the optical modulation module may include a light homogenizing component, a lens assembly, a light valve, and a prism assembly. The light homogenizing component is configured to homogenize the incident illumination light beam and emit it to the lens assembly. The lens assembly may collimate the illumination light beam first and then converge it and emit it to the prism assembly. The prism assembly reflects the illumination light beam to the light valve. The light valve is configured to modulate the illumination light beam incident thereon into a projection light beam according to the image signal.

[0058] The light combining prism 20 is used to combine the first image light, the second image light and the third image light modulated by a plurality of optical modulation modules to generate colored image light.

[0059] In some examples, the projection device 1000 further includes a projection lens. The projection lens is arranged opposite to the light-emitting surface 20b of the light-combining prism 20. That is, the projection lens is arranged on the light-emitting path of the light-combining prism 20 to image the colored image light onto a preset projection plane or screen.

[0060] In some examples, such as Figure 4 As shown, the light combining prism 20 includes four mutually perpendicular triangular prisms 21. The four triangular prisms 21 are glued together to form mutually perpendicular diagonal surfaces.

[0061] For example, Figure 4 and Figure 5 As shown, the light combining prism 20 is projected in the direction of the height of the light combining prism 20 , and is in an “X” shape. The “X” shape is the projection line of the coating surface of the light combining prism 20 .

[0062] Exemplarily, the light-combining prism 20 includes a first diagonal surface (not shown in the figure) and a second diagonal surface (not shown in the figure) perpendicular thereto.

[0063] For example, Figure 5 As shown, the first diagonal surface and the second diagonal surface are divided into a first coating layer 211, a second coating layer 212, a third coating layer 213 and a fourth coating layer 214 in a clockwise direction. The first coating layer 211 is coated with a first optical thin film for transmitting green light and reflecting red light; the second coating layer 212 is coated with a second optical thin film for transmitting red light and green light and reflecting blue light; the third coating layer 213 is coated with a third optical thin film for transmitting blue light and green light and reflecting red light; the fourth coating layer 214 is coated with a fourth optical thin film for transmitting green light and reflecting blue light.

[0064] For the convenience of description, among the light incident surfaces 20a of the light combining prism 20, the light incident surface 20a corresponding to the red light source is defined as the first light incident surface 201; the light incident surface 20a corresponding to the blue light source is defined as the second light incident surface 202; and the light incident surface 20a corresponding to the green light source is defined as the third light incident surface 203.

[0065] For example, Figure 5As shown, the light emitted by the red light source becomes red image light after passing through the optical cup 10 and the optical modulation module. The red image light passes through the first light incident surface 201 and enters the light combining prism 20. Part of the red image light is incident on the first coating layer 211. Since the first coating layer 211 is coated with a first optical film for reflecting red light, the red image light incident on the first coating layer 211 is reflected. The red image light reflected by the first coating layer 211 is incident on the second coating layer 212. Since the second coating layer 212 is coated with a second optical film for transmitting red light, this part of the red image light can be The red light source is directly incident on the light-emitting surface 20b of the light-combining prism 20 through the second coating layer 212. The red light source is emitted by the light cup 10 and the optical modulation module, and then becomes red image light. The red image light passes through the first light-incident surface 201 and enters the light-combining prism 20. After a portion of the red image light is incident on the second coating layer 212, it passes through the second coating layer 212 and is incident on the third coating layer 213. Since the third coating layer 213 is coated with a third optical film for reflecting red light, the portion of the red image light is reflected by the third coating layer 213 and is incident on the light-emitting surface 20b of the light-combining prism 20.

[0066] like Figure 5 As shown, the light emitted by the blue light source becomes blue image light after passing through the optical cup 10 and the optical modulation module. The blue image light passes through the second light incident surface 202 and enters the light combining prism 20. Part of the blue image light is incident on the fourth coating layer 214. Since the fourth coating layer 214 is coated with a fourth optical film for reflecting blue light, the blue image light incident on the fourth coating layer 214 is reflected. The blue image light reflected by the fourth coating layer 214 is incident on the third coating layer 213. Since the third coating layer 213 is coated with a third optical film for transmitting blue light, , thus, this part of the blue image light can directly pass through the third coating layer 213 and be incident on the light-emitting surface 20b of the light-combining prism 20; the light emitted by the blue light source becomes blue image light after passing through the optical cup 10 and the optical modulation module, and the blue image light passes through the second light-incident surface 202 and enters the light-combining prism 20, and part of the blue image light is incident on the second coating layer 212. Since the second coating layer 212 is coated with a second optical film for reflecting blue light, this part of the blue image light is reflected by the second coating layer 212 and is incident on the light-emitting surface 20b of the light-combining prism 20.

[0067] like Figure 5As shown, the light emitted by the green light source becomes green image light after passing through the optical cup 10 and the optical modulation module. The green image light passes through the third light incident surface 203 and enters the light combining prism 20. Part of the green image light is incident on the first coating layer 211. Since the first coating layer 211 is coated with a first optical film for transmitting green light, this part of the green image light can directly pass through the first coating layer 211. After passing through the first coating layer 211, this part of the light is incident on the second coating layer 212. Since the second coating layer 212 is coated with a second optical film for transmitting green light, this part of the green image light can directly pass through the second coating layer 212 and be incident on the light exit surface 20b of the light combining prism 20. The light emitted by the green light source becomes green image light after passing through the optical cup 10 and the optical modulation module. The green image light passes through the third light incident surface 203 and enters the light-combining prism 20. Part of the green image light is incident on the fourth coating layer 214. Since the fourth coating layer 214 is coated with a fourth optical film for transmitting green light, this part of the green image light can directly pass through the fourth coating layer 214. After passing through the fourth coating layer 214, this part of the green image light is incident on the third coating layer 213. Since the third coating layer 213 is coated with a third optical film for transmitting green light, this part of the green image light can directly pass through the third coating layer 213 and be incident on the light-exiting surface 20b of the light-combining prism 20.

[0068] The red image light, the blue image light, and the green image light are mixed into color image lights via the light combining prism 20 .

[0069] The inventors of the present disclosure have discovered through research that the current coating process can only guarantee the transmittance and reflectance of vertically incident light. For light incident at a large angle, due to the weakening effect of the film system, some of the light incident at a large angle cannot pass through, reducing the utilization rate of the light; at the same time, the transmittance of large-angle light in red light, large-angle light in blue light, and large-angle light in green light is inconsistent at the coating layer, resulting in an offset in the color coordinates of the final projected image.

[0070] Based on this, in the embodiments of the present disclosure, combined with Figure 6 , Figure 7 , Figure 8 As shown, the optical cup 10 includes an optical cup body 11 and a plurality of dimming parts 12 located outside the optical cup body 11. The plurality of dimming parts 12 are sequentially arranged along the circumference of the optical cup body 11, and the dimming parts 12 extend from the light inlet 10a to the light outlet 10b of the optical cup 10. The dimming parts 12 are configured to adjust the transmission path of the light in the optical cup 10 so that the incident angle of at least part of the light incident on the light incident surface 20a of the light combining prism 20 becomes smaller.

[0071] In some examples, the optical cup body 11 is a hollow optical cup body. In other examples, the optical cup body 11 may be a solid optical cup body. The embodiments of the present disclosure are not limited to this.

[0072] In some examples, such as Figure 6 As shown, the optical cup body 11 is a cylindrical structure. For example, the optical cup body 11 is arranged around the optical axis of the lens assembly in the optical modulation module to form a cylindrical structure. The cylindrical structure is used to reflect the light irradiated by the light source into the optical cup 10 to the optical modulation module.

[0073] For example, Figure 6 As shown, the inner wall surface of the optical cup body 11 is an arc surface.

[0074] Exemplary, combined Figure 6 and Figure 7 As shown, the light inlet 10a of the optical cup 10 and the light outlet 10b of the optical cup 10 are both circular or elliptical, and the area of ​​the light inlet 10a is smaller than the area of ​​the light outlet 10b. The illumination light beam emitted by the light source enters the interior of the optical cup body 11 through the light inlet 10a and is emitted from the light outlet 10b, so that the area of ​​the exiting light spot is larger than the area of ​​the incident light spot, thereby reducing the divergence angle of the illumination light beam, and irradiating the light beam onto the optical modulation module in a non-imaging manner.

[0075] In addition, the inner wall of the optical cup 10 has a collimating effect on the incident light. For example, part of the light incident from the light inlet 10a to the inner wall of the optical cup 10 can be emitted from the light outlet 10b after being reflected by the inner wall of the optical cup 10. In this way, the problem of multiple reflections of this part of the light in the optical cup 10, which causes a large light loss, can be avoided, thereby improving the light emission efficiency.

[0076] Exemplarily, the light modulating unit 12 can adjust the transmission path of the light in the optical cup 10 so that the incident angle of the large-angle incident light incident on the light incident surface 20 a of the light combining prism 20 is reduced.

[0077] In the present disclosure, the incident angle of the illumination light beam incident on the light-combining prism 20 at 50% of the maximum light intensity of the light source is tested.

[0078] The test shows that for a traditional square light cup, the incident angle of the illumination light beam at 50% of the maximum light intensity of the light source incident on the light-combining prism 20 is 15.349°. For the projection device 1000 provided by the above embodiment of the present disclosure, the incident angle of the illumination light beam at 50% of the maximum light intensity of the light source incident on the light-combining prism 20 is 14.968°. Obviously, the projection device provided by the embodiment of the present disclosure can reduce the incident angle of at least part of the light incident on the light-entering surface 20a of the light-combining prism 20.

[0079] In this embodiment, the transmission path of the light in the light cup 10 is adjusted by means of a plurality of dimming parts 12 located on the outside of the light cup body 11, so that the incident angle of at least part of the light incident on the light incident surface 20a of the light combining prism 20 is reduced, thereby improving the problem that some large-angle incident light cannot pass through due to the weakening of the film effect, thereby improving the transmittance of the light and improving the projection effect of the projection device 1000.

[0080] Moreover, by means of a plurality of dimming parts 12 located on the outside of the optical cup body 11, the transmission path of the light in the optical cup 10 is adjusted, so that the incident angle of at least part of the light incident on the light entrance surface 20a of the light-combining prism 20 is reduced, and the proportion of high-angle light in the red image light, the proportion of high-angle light in the blue image light, and the proportion of high-angle light in the green image light can also be reduced, thereby improving the problem of inconsistent transmittance of high-angle light in the red light, high-angle light in the blue light, and high-angle light in the green light at the coating layer, which leads to the color coordinate offset of the final projected image.

[0081] In some embodiments, Figure 6 As shown, in the first direction, the cross-sectional shape of the dimming portion 12 is an isosceles right triangle; wherein the first direction is a direction perpendicular to the light inlet 10 a of the optical cup 10 pointing to the light outlet 10 b .

[0082] It should be noted that the above isosceles right triangle is not limited to an isosceles right triangle in an absolute sense. For example, in the first direction, the cross-sectional shape of the dimming unit 12 is substantially an isosceles right triangle.

[0083] Exemplarily, the dimming unit 12 may be in a triangular prism shape, and the area of ​​the end surface of the triangular prism dimming unit 12 close to the light inlet 10 a of the optical cup 10 is smaller than the area of ​​the end surface of the triangular prism dimming unit 12 close to the light outlet 10 b of the optical cup 10 .

[0084] The illumination light beam emitted by the light source is incident on one side surface of the triangular prism-shaped dimming section 12, and then emitted from the other side surface of the triangular prism-shaped dimming section 12. The emitted light beam is deflected toward the end surface of the triangular prism-shaped dimming section 12 (for example, the end surface of the dimming section 12 close to the light inlet 10a of the optical cup 10), thereby achieving the adjustment of the transmission path of the illumination light beam.

[0085] In some embodiments, Figure 6 As shown, the dimming unit 12 includes: a first side surface 121 , a second side surface 122 and a third side surface 123 connected in sequence, and the third side surface 123 is connected to the optical cup body 11 ; the first side surface 121 and the second side surface 122 are curved surfaces.

[0086] Exemplarily, the first side surface 121 , the second side surface 122 , and the third side surface 123 are sequentially connected to form a column shape (eg, a triangular prism).

[0087] For example, after the illumination light beam emitted by the light source enters the optical cup 10 through the light inlet 10a of the optical cup 10, it passes through the optical cup body 11 and enters the dimming unit 12, where total internal reflection occurs, reflecting all the light incident to the dimming unit 12. Thus, the utilization rate of light is improved.

[0088] Specifically, after the illumination light beam emitted by the light source enters the optical cup 10 through the light inlet 10a of the optical cup 10, it passes through the optical cup body 11 and is incident on the first side surface 121 of the dimming unit 12. The illumination light beam is deflected 90° at the first side surface 121 and is incident on the second side surface 122. After being deflected 90° at the second side surface 122, it is emitted from the light outlet 10b of the optical cup 10. That is, the illumination light beam emitted by the light source is deflected twice in the optical cup 10 before being emitted, thereby avoiding multiple reflections of the light in the optical cup 10, thereby reducing the reflection distance of the light, reducing the light loss, and greatly improving the utilization rate of the light.

[0089] For example, along the circumference of the optical cup body 11 , the curvature of the first side surface 121 and the curvature of the second side surface 122 may be the same or different. The embodiments of the present disclosure are not limited to this.

[0090] In some embodiments, along the second direction, the curvature of the first side surface 121 gradually increases. The second direction is the direction from the light inlet 10a of the optical cup 10 to the light outlet 10b.

[0091] Exemplarily, the closer the first side surface 121 is to the light outlet 10 b , the greater the curvature thereof.

[0092] By setting the curvature at different positions of the first side surface 121 , the light incident on the first side surface 121 is totally reflected by the first side surface 121 , vertically incident on the second side surface 122 , and is deflected 90° at the second side surface 122 before being emitted from the light outlet 10 b of the optical cup 10 .

[0093] As can be seen from the above, the optical cup body 11 is a cylindrical structure, and the area of ​​the light inlet 10a of the optical cup 10 is smaller than the area of ​​the light outlet 10b of the optical cup 10. By gradually increasing the curvature of the first side surface 121 in the direction in which the light inlet 10a of the optical cup 10 points to the light outlet 10b, it is possible to make the incident light at different positions of the first side surface 121 perpendicularly incident to the second side surface 122 in the direction in which the light inlet 10a of the optical cup 10 points to the light outlet 10b, and after being deflected 90° at the second side surface 122, it is emitted from the light outlet 10b of the optical cup 10, so that the light at the light outlet 10b of the optical cup 10 is emitted uniformly.

[0094] In some embodiments, along the second direction, the curvature of the second side surface 122 gradually increases.

[0095] Exemplarily, the closer the second side surface 122 is to the light outlet 10 b , the greater the curvature thereof.

[0096] By setting the curvatures at different positions of the second side surface 122 , the light incident on the second side surface 122 can be deflected by 90° at the second side surface 122 and emitted from the light outlet 10 b of the optical cup 10 .

[0097] As can be seen from the above, the optical cup body 11 is a cylindrical structure, and the area of ​​the light inlet 10a of the optical cup 10 is smaller than the area of ​​the light outlet 10b of the optical cup 10. By gradually increasing the curvature of the second side surface 122 in the direction in which the light inlet 10a of the optical cup 10 points to the light outlet 10b, incident light at different positions of the second side surface 122 can be emitted along the second direction in the direction in which the light inlet 10a of the optical cup 10 points to the light outlet 10b, so that the light at the light outlet 10b of the optical cup 10 is emitted uniformly.

[0098] In some embodiments, the curvature radius of the first side surface 121 ranges from 37 mm to 128 mm; the curvature radius of the second side surface 122 ranges from 37 mm to 128 mm.

[0099] For example, the curvature radius of the second side surface 122 near the light outlet 10b may be 128 mm; the curvature radius of the second side surface 122 near the light entrance 10a may be 38 mm, and the curvature of the first side surface 121 gradually increases in the direction from the light entrance 10a of the optical cup 10 to the light outlet 10b.

[0100] For example, the curvature radius of the first side surface 121 near the light outlet 10b may be 128 mm; the curvature radius of the first side surface 121 near the light entrance 10a may be 38 mm, and the curvature of the second side surface 122 gradually increases in the direction from the light entrance 10a of the optical cup 10 to the light outlet 10b.

[0101] Exemplarily, the first side surface 121 and the second side surface 122 are symmetrically arranged. For example, at a circumferential position along the optical cup body 11 , the radius of curvature of the first side surface 121 is equal to the radius of curvature of the second side surface 122 .

[0102] In this embodiment, by setting the curvature radii at different positions of the first side surface 121 and the second side surface 122, light incident on different positions of the first side surface 121 can be vertically incident on the second side surface 122 after being totally reflected by the first side surface 121, and can be deflected 90° at the second side surface 122 to become light emitted along the height direction of the optical cup body 11 and emitted through the light outlet 10b of the optical cup 10.

[0103] In some embodiments, along the circumference of the optical cup body 11 , the distances between any two adjacent dimming parts 12 are equal or substantially equal.

[0104] Exemplarily, along the circumference of the optical cup body 11, the distance between two adjacent dimming parts 12 ranges from 0.05 mm to 0.1 mm. For example, along the circumference of the optical cup body 11, the distance between two adjacent dimming parts 12 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.10 mm, etc. The embodiments of the present disclosure are not limited to this.

[0105] With the above arrangement, the plurality of dimming parts 12 are evenly arranged along the circumference of the optical cup body 11 , so that the light emitted from the optical cup 10 is evenly arranged.

[0106] In some embodiments, the plurality of dimming units 12 are integrated with the optical cup body 11 .

[0107] Exemplarily, the material of the plurality of dimming parts 12 is the same as the material of the optical cup body 11. For example, the material of the plurality of dimming parts 12 and the material of the optical cup body 11 are both polymethyl methacrylate (PMMA for short).

[0108] It should be noted that the above-mentioned multiple dimming parts 12 and the optical cup body 11 are integrated in one arrangement, which means that the multiple dimming parts 12 and the optical cup body 11 are not bonded together by ordinary film layers due to the van der Waals force or hydrogen bond force between molecules at the contact surface, but that the multiple dimming parts 12 and the optical cup body 11 are combined into an integrated structure by chemical action to form covalent bonds or ionic bonds between the multiple dimming parts 12 and the optical cup body 11, that is, the multiple dimming parts 12 and the optical cup body 11 are permanently bonded. Specifically, the edge areas of the multiple dimming parts 12 are in contact with the edge areas of the optical cup body 11, and the contact surface can be an integrated structure that is permanently bonded in the form of covalent bonds through chemical crosslinking; but the utility model is not limited to this.

[0109] For example, the plurality of dimming units 12 and the optical cup body 11 may be formed into an integrated structure through injection molding.

[0110] In this embodiment, the plurality of dimming units 12 are integrated with the optical cup body 11 , thereby simplifying the manufacturing process of the optical cup 10 .

[0111] In some embodiments, the optical cup body 11 is a plastic optical cup.

[0112] Exemplarily, the material of the optical cup body 11 may be polymethyl methacrylate.

[0113] In some implementations, the material of the optical cup body 11 is a metal material. Fig. 9 As shown, Fig. 9 When the material of the optical cup body 11 is metal, the reflectivity of the imported optical cup body and the domestic optical cup body to light of different wavelength bands is tested respectively, wherein the horizontal axis is wavelength (Wavelength) and the total axis is reflectivity (Total Reflectance).

[0114] Depend on Fig. 9 It can be seen that when the material of the optical cup body 11 is a metal material, the reflectivity of the optical cup to light with a wavelength between 380nm and 750nm varies greatly, which will cause the color coordinates of the projection image to be offset.

[0115] Wavelength (nm) 365 404.7 435.8 480 486.1 546.1 587.6 Refractive Index 1.5136 1.5066 1.5026 1.4983 1.4978 1.4938 1.4918 Wavelength (nm) 589.3 643.9 656.3 706.5 852.1 1014 Refractive Index 1.4917 1.4896 1.4892 1.4878 1.485 1.4831

[0116] Table 1

[0117] Table 1 shows the transmittance of the plastic optical cup for light of different wavelengths. As can be seen from Table 1, the transmittance of the plastic optical cup for light of different wavelengths is more consistent.

[0118] In this embodiment, the optical cup body 11 is a plastic optical cup, which not only reduces the manufacturing cost of the optical cup 10 , but also ensures the accuracy of color reproduction of the projection device 1000 because the transmittance of the plastic optical cup to light of different wavelengths is more consistent.

[0119] In some embodiments, the optical cup body 11 is a transmissive optical cup.

[0120] Exemplarily, the material of the optical cup body 11 may include polymethyl methacrylate. The polymethyl methacrylate material has a high light transmittance. When the material of the optical cup body 11 includes polymethyl methacrylate, the light transmittance of the optical cup body 11 can be improved, and the utilization rate of light can be further improved. Of course, the material of the optical cup body 11 can also include other materials, as long as the optical cup body 11 can achieve the transmission function.

[0121] In this embodiment, the optical cup body 11 is a transmissive optical cup, which has a high transmittance to light of different wavelengths, and helps to ensure the accuracy of color reproduction of the projection device 1000 .

[0122] In some embodiments, Fig.10 As shown, the light combining prism 20 includes a plurality of rectangular light incident surfaces 20a and a rectangular light emitting surface 20b, wherein the plurality of light incident surfaces 20a and the light emitting surface 20b are sequentially connected to form a column, and a light incident surface 20a among the plurality of light incident surfaces 20a is disposed opposite to the light emitting surface 20b. The distance between the light emitting surface 20b and the light incident surface 20a disposed opposite to each other is equal to the size of the short side of the rectangle.

[0123] For example, Fig. 9 As shown, the number of light incident surfaces 20 a is three, and three rectangular light incident surfaces 20 a and one rectangular light emitting surface 20 b form a quadrangular prism.

[0124] The rectangle includes a short side and a long side. For example, the aspect ratio of a rectangle is generally 16:9, 16:10, or 4:3.

[0125] In one implementation, the light-combining prism 20 is placed horizontally.

[0126] For example, Figure 2 As shown, the height of the quadrangular prism is equal to the size of the short side of the rectangle. The distance from the light-emitting surface 20b to the light-entering surface 20a disposed opposite to each other is equal to the size of the long side of the rectangle. For example, the height of the quadrangular prism is equal to 9, and the distance from the light-emitting surface 20b to the light-entering surface 20a disposed opposite to each other is equal to 16. At this time, the volume of the light-combining prism 20 is equal to 16×16×9. The volume of the light-combining prism 20 is relatively large.

[0127] In the embodiment of the present disclosure, the distance from the light-emitting surface 20b to the light-entering surface 20a disposed opposite to each other is equal to the size of the short side of the rectangle, and the height of the quadrangular prism is equal to the size of the long side of the rectangle; that is, the light-combining prism 20 is disposed vertically. At this time, the volume of the light-combining prism 20 is equal to 16×9×9. Thus, the volume of the space in the projection device 1000 for accommodating the light-combining prism 20 can be reduced, thereby reducing the volume of the projection device 1000 and improving the lightweight and portability of the projection device 1000.

[0128] Moreover, when the light-combining prism 20 is arranged vertically, the width of the light incident surface 20a is equal to the size of the short side of the rectangle, which can filter out some large-angle light, so that some large-angle light cannot be incident on the light incident surface 20a. That is, the proportion of large-angle light in the light incident on the light incident surface 20a is physically reduced, so that the light incident on the light incident surface 20a can effectively pass through the light-combining prism 20, thereby improving the transmittance of light.

[0129] In some embodiments, Fig.10As shown, among the four triangular prisms 21 of the light-combining prism 20, the triangular prism 21 includes two end faces arranged opposite to each other, the end faces are isosceles triangles, and the length of the base of the isosceles triangle is less than the distance between the two end faces.

[0130] Exemplarily, the distance between the two end faces of the triangular prism 21, that is, the height of the light-combining prism 20. The length of the base of the isosceles triangle is less than the distance between the two end faces, that is, the height of the light-combining prism 20, and is greater than the width of the light-combining prism 20. That is, the light-combining prism 20 is arranged vertically.

[0131] From the above, it can be seen that by arranging the light-combining prism 20 vertically, the volume of the space in the projection device 1000 for accommodating the light-combining prism 20 can be reduced, thereby reducing the volume of the projection device 1000 and improving the lightweight and portability of the projection device 1000.

[0132] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, 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: An optical cup, the optical cup comprising a light inlet and a light outlet arranged in opposite directions; A light-combining prism, the light-combining prism comprising a plurality of light-incident surfaces and a light-exiting surface, one of the light-incident surfaces being arranged opposite to a light-exiting port of the optical cup; wherein, The optical cup comprises: Light cup body; A plurality of dimming parts are located on the outside of the optical cup body, the plurality of dimming parts are arranged in sequence along the circumference of the optical cup body, and the dimming parts extend from the light inlet to the light outlet of the optical cup; the dimming parts are configured to: adjust the transmission path of the light in the optical cup so that the incident angle of at least part of the light incident on the light incident surface of the light combining prism becomes smaller.

2. The projection device according to claim 1, characterized in that: In a first direction, the cross-sectional shape of the dimming portion is an isosceles right triangle; wherein the first direction is a direction perpendicular to the light entrance of the optical cup and pointing to the light exit.

3. The projection device according to claim 1, characterized in that: The dimming part comprises: a first side surface, a second side surface and a third side surface which are connected in sequence, and the third side surface is connected to the optical cup body; The first side surface and the second side surface are curved surfaces.

4. The projection device according to claim 3, characterized in that: Along the second direction, the curvature of the first side surface gradually increases; and / or, The curvature of the second side surface gradually increases; wherein the second direction is: the direction in which the light entrance of the optical cup points to the light exit.

5. The projection device according to claim 4, characterized in that: The range of the radius of curvature of the first side surface is 37 mm to 128 mm; the range of the radius of curvature of the second side surface is 37 mm to 128 mm.

6. The projection device according to claim 1, characterized in that: Along the circumference of the optical cup body, the distance between any two adjacent dimming parts is equal or substantially equal.

7. The projection device according to claim 1, characterized in that: The plurality of dimming units are integrated with the optical cup body.

8. The projection device according to claim 1, characterized in that: The optical cup body is a plastic optical cup; and / or, The optical cup body is a transmission type optical cup.

9. The projection device according to claim 1, characterized in that: The light-combining prism includes a plurality of rectangular light-incidence surfaces and a rectangular light-exiting surface, wherein the plurality of light-incidence surfaces and the light-exiting surface are sequentially connected to enclose a column, and one of the plurality of light-incidence surfaces is disposed opposite to the light-exiting surface, and a distance from the light-exiting surface to the light-incidence surface disposed opposite to the light-exiting surface is equal to the size of the short side of the rectangle.

10. The projection device according to claim 9, characterized in that: The light-combining prism is composed of four triangular prisms, each of which includes two end faces arranged opposite to each other, each end face is an isosceles triangle, and the length of the base of the isosceles triangle is less than the distance between the two end faces.

11. A projection system, characterized in that: include: A projection device, wherein the projection device is the projection device according to any one of claims 1 to 10; as well as, The projection screen is located at the light-emitting side of the projection device.

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