Projector

Abstract

The present application provides a projector, including a refraction device, a projection lens and a light modulator, wherein the refraction device is located between the projection lens and the light modulator, and the light modulator is configured to modulate the light reflected into the refraction device into projection light and non-projection light, and the refraction device includes a light refraction component, and a refraction portion is arranged along the edge of the light exiting surface of the light refraction component; the refraction portion includes an incident surface and an exiting surface, and the incident surface and the exiting surface form a predetermined angle, and the incident surface is arranged on a side of the refraction portion close to the light modulator. The present application prevents the non-projection light emitted by the refraction device from entering the projection lens, and does not form stray light in the projection lens due to the non-projection light, thereby ensuring the contrast of the projection picture and improving the imaging quality, and at the same time, collects the non-projection light to achieve a better processing and utilization.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and more specifically to a projector. Background Art

[0002] A projector, also known as a projector, is a device that can project images or videos onto a screen. It can be connected to computers, VCDs, DVDs, BDs, game consoles, DVs, etc. through different interfaces to play corresponding video signals. It is widely used in homes, offices, schools, entertainment venues and other areas.

[0003] When the projector is working, the light source emits light to the light shaping system. The shaped light enters the refraction device at a certain angle. When passing through the interface inside the refraction device, the light is totally reflected to the light modulator. After being modulated by the light modulator, the light is modulated into projection light (useful light) and non-projection light (useless light). The projection light is transmitted through the refraction device and then enters the projection lens for imaging. After the non-projection light is refracted by the refraction device, part of the non-projection light will also enter the projection lens. The non-projection light entering the projection lens forms stray light, which will cause a decrease in the contrast of the projection picture, affect the imaging quality, and cause damage to components such as the projection lens, affecting the appearance of the projector.

[0004] In view of the existence of the above problems, the present application proposes a new projector to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] On one hand, the present application provides a projector, which includes a refraction device, a projection lens and a light modulator, wherein the refraction device is located between the projection lens and the light modulator, and the light modulator is configured to modulate the light reflected into the refraction device into projection light and non-projection light, and the refraction device includes a light refraction component, and a refraction portion is arranged along the edge of the light output surface of the light refraction component; the refraction portion includes an incident surface and an output surface, the incident surface forms a predetermined angle with the output surface, and the incident surface is arranged on a side of the refraction portion close to the light modulator.

[0007] In one example, the refractive index of the refractive portion is less than or equal to the refractive index of the light refraction component.

[0008] In one example, the predetermined angle satisfies the following conditions:

[0009] α<θ-arccos(1 / N)

[0010] Wherein, α is the predetermined angle, N is the refractive index of the refractive portion, and θ is the angle between the non-projection light reflected by the light modulator into the light refraction component and the light emitting surface of the light refraction component.

[0011] In one example, the refraction portion is located outside the area illuminated by the projection light reflected by the light modulator into the light refraction component.

[0012] In one example, the refractive portion is a prism or a lens, wherein the prism includes a plurality of prism units, and the lens includes a Fresnel lens.

[0013] In one example, the light refraction component includes a first prism and a second prism that are arranged in close contact with each other, the refraction portion is arranged at an edge position of a light emitting surface of the second prism, and the refraction portion and the second prism are integrally formed.

[0014] In one example, the refracting portion is used to refract the non-projection light to an area outside the projection lens.

[0015] In one example, the projector further includes a light shaping device and a light collecting device, wherein the light shaping device is used to shape the non-projection light emitted by the refraction device, and the light collecting device is used to collect the non-projection light shaped by the light shaping device.

[0016] In one example, the light collecting device includes a light absorbing component, which is configured to absorb non-projection light collected by the light collecting device; an optical window is provided between the light absorbing component and the light shaping device; the optical window is configured to spatially isolate the light absorbing component from the light shaping device, and is configured to transmit the non-projection light shaped by the light shaping device to the light absorbing component; the light collecting device also includes a heat dissipation portion, which is arranged outside the projector and is used to dissipate heat to the outside.

[0017] In one example, the light collecting device includes a light output component configured to output the non-projection light collected by the light collecting device.

[0018] In one example, the light output component includes a light-guiding element and an output terminal connected to each other, wherein the light collecting device is configured to guide non-projection light incident therein to the light-guiding element, and the light-guiding element is configured to transmit the non-projection light therein to the output terminal so that the output terminal outputs the non-projection light.

[0019] In one example, the output terminal is an interface, which is configured to connect to a display device to output the non-projection light transmitted therein by the light-guiding element to the display device for display; or the output terminal is an indicator, which is configured to be able to present the non-projection light transmitted therein by the light-guiding element.

[0020] According to the projector of the embodiment of the present application, a refraction device including a refraction part is provided, and by making the incident surface and the exit surface of the refraction part form a certain angle, the refraction part can refract the non-projection light reflected by the light modulator into the refraction device to an area outside the projection lens, thereby avoiding the non-projection light emitted through the refraction device from entering the projection lens, and preventing stray light from being formed in the projection lens due to the non-projection light, thereby ensuring the contrast of the projection picture and improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram of the working of the projector is shown;

[0024] Figure 2 Another working schematic diagram of the projector is shown;

[0025] Figure 3A A schematic structural diagram of a refraction device according to an embodiment of the present application is shown;

[0026] Figure 3B A schematic diagram showing a refraction device refracting light according to an embodiment of the present application is shown;

[0027] Figure 3C A schematic structural diagram of a refraction portion according to an embodiment of the present application is shown;

[0028] Figure 4A A schematic structural diagram of a refraction device according to another embodiment of the present application is shown;

[0029] Figure 4B A schematic diagram showing a refraction device refracting light according to another embodiment of the present application is shown;

[0030] Figure 5 A schematic structural diagram of a refraction device according to another embodiment of the present application is shown;

[0031] Figure 6 A schematic structural diagram of a refraction device according to another embodiment of the present application is shown;

[0032] Figure 7 Another working schematic diagram of the projector is shown;

[0033] Figure 8 A structural block diagram of a projector according to an embodiment of the present application is shown;

[0034] Fig. 9A A schematic diagram showing a light collecting device collecting non-projection light according to an embodiment of the present application is shown;

[0035] Fig. 9B A schematic diagram showing a light collecting device collecting non-projection light according to another embodiment of the present application is shown;

[0036] Fig. 10A A schematic diagram showing a light output device outputting non-projection light according to an embodiment of the present application is shown;

[0037] Fig. 10B A schematic diagram showing a light output device outputting non-projection light according to another embodiment of the present application is shown;

[0038] Fig. 10C A schematic diagram showing a light output device outputting non-projection light according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0040] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0041] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0042] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0043] In the related technology, combined Figure 1 When the projector is working, the light source emits a light 110, and the light 110 is incident into the refraction device 220 at a predetermined angle. The refraction device 220 includes a first prism 221 and a second prism 222. When the light 110 passes through the interface between the first prism 221 and the second prism 222, it is totally reflected to the light modulator 230. After being modulated by the light modulator 230, the light 110 is modulated into a projection light 111 and a non-projection light 112. The projection light 111 is transmitted through the refraction device 220 and then incident into the projection lens 210 for imaging. Among them, the projection light 111 is also the image light, which is used to project the image. The non-projection light 112 is other light except the projection light.

[0044] Combination Figure 2In the figure, the solid-line frame represents the projection light 121, and the dotted-line frame represents the non-projection light 122. Since the shaped light is a beam with a predetermined angle, the projection light 121 is incident on the projection lens 210 after being transmitted through the refraction device 220 for imaging, and the non-projection light 122 is refracted by the refraction device 220, and part of the non-projection light 122 will be incident on the projection lens 210 (as shown in the area A in the figure). The non-projection light 122 incident on the projection lens 210 forms stray light, which will cause a decrease in the contrast of the projection picture and affect the imaging quality.

[0045] In order to solve the above problems, a projector is provided in the present application, wherein the projector includes a refraction device, a projection lens and a light modulator, wherein the refraction device is located between the projection lens and the light modulator, and the light modulator is configured to modulate the light reflected into the refraction device into projection light and non-projection light, wherein the refraction device includes a light refraction component, and a refraction portion is arranged along the edge of the light output surface of the light refraction component; the refraction portion includes an incident surface and an output surface, wherein the incident surface forms a predetermined angle with the output surface, and the incident surface is arranged on a side of the refraction portion close to the light modulator.

[0046] According to the projector of the present application, a refraction device including a refraction part is provided, and by making the incident surface and the exit surface of the refraction part form a certain angle, the refraction part can refract the non-projection light reflected by the light modulator into the refraction device to an area outside the projection lens, thereby avoiding the non-projection light emitted through the refraction device from entering the projection lens, and preventing stray light from being generated in the projection lens due to the non-projection light, thereby ensuring the contrast of the projection picture and improving the imaging quality.

[0047] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0048] Reference below Figure 3A and Figure 3B The following describes a refraction device 340 according to an embodiment of the present application. Figure 3A A refraction device 340 according to an embodiment of the present application is shown; Figure 3B FIG. 3 is a schematic diagram showing a refracting device 340 refracting light according to an embodiment of the present application. Figure 3A and Figure 3BAs shown, the refraction device 340 is used in a projector, and the projector has a projection lens 350 and a light modulator 330. The refraction device 340 is located between the projection lens 350 and the light modulator 330. The refraction device 340 includes a light refraction component 341. A refraction portion 342 is provided at an edge position of a surface of the light refraction component 341 facing the projection lens 350, and at least a portion of the refraction portion 342 is projected beyond the projection lens 350 along the axis direction of the projection lens 350; wherein the light refraction component 341 is configured to The light of the component 341 is guided to the light modulator 330, and is configured to guide the projection light 131 reflected by the light modulator 330 into the light refraction component 341 to the projection lens 350, and is configured to guide the non-projection light 132 reflected by the light modulator 330 into the light refraction component 341 to the refraction portion 342; the refraction portion 342 is configured to converge the non-projection light 132 guided by the light refraction component 341 to the refraction portion 342, and refract the converged non-projection light 132 to an area outside the projection lens 350.

[0049] Based on the refraction device 340, the light refraction component 341 guides the light incident on the light refraction component 341 to the light modulator 330, and the light modulator 330 modulates the light into the projection light 131 and the non-projection light 132 and reflects the light into the refraction device 340. The projection light 131 reflected by the light modulator 330 into the refraction device 340 is guided into the projection lens 350 through the light refraction component 341 for imaging. The non-projection light 132 reflected by the light modulator 330 into the refraction device 340 is guided into the refraction part 342 through the light refraction component 341, and the non-projection light 132 is refracted to the area outside the projection lens 350 through the refraction part 342, thereby preventing the non-projection light 132 emitted from the refraction device 340 from being incident on the projection lens 350, and no stray light is formed in the projection lens 350 due to the non-projection light 132, thereby ensuring the contrast of the projection picture and improving the imaging quality.

[0050] In the embodiment of the present application, the projector used by the refraction device 340 can be a digital light processing projector (Digital Light Processing, referred to as DLP), LCoS (liquid crystal on silicon) projector, liquid crystal display (liquid crystal display, referred to as LCD) projector, 3LCD projector, etc., without limitation.

[0051] In the embodiment of the present application, the refraction portion 342 is located outside the area illuminated by the projection light 131, and the refraction portion 342 is located within at least a portion of the area illuminated by the non-projection light 132. Specifically, the projection light 131 reflected from the light modulator 330 into the refraction device 340 will only enter the projection lens 350 after being guided by the light refraction component 341, and will not enter the refraction portion 342, while the non-projection light 132 reflected from the light modulator 330 into the refraction device 340 will be partially or completely guided by the light refraction component 341 into the refraction portion 342, and then refracted by the refraction portion 342 to the area outside the projection lens 350.

[0052] In the embodiments of the present application, Figure 3A and Figure 3B As shown, the light refraction component 341 includes a first prism 3411 and a second prism 3412 that are arranged in close contact, and the refraction portion 342 is arranged on a portion of the surface of the second prism 3412 that faces the projection lens 650. Specifically, as Figure 3B As shown, the first prism 3411 is configured to direct the projection light 131 and non-projection light 132 reflected from the light modulator 630 into the first prism 3411 and emit them to the second prism 3412; the second prism 3412 is configured to guide the projection light 131 emitted from the first prism 3411 into the projection lens 650, and guide the non-projection light 133 emitted from the first prism 3411 into the refraction portion 342; the refraction portion 342 is configured to refract the non-projection light 163 guided by the second prism 3412 into the area outside the projection lens 650.

[0053] In the embodiment of the present application, the first prism 3411 may be a triangular prism, the second prism 3412 may be a triangular prism, and the refractive portion 342 may be a triangular prism.

[0054] In the embodiments of the present application, Figure 3C As shown, the refraction part 342 can be a prism, and the prism includes a light emitting surface 3422 and a light incident surface 3421, and the light emitting surface 3422 faces the projection lens 650, and the angle between the light incident surface 3421 and the light emitting surface 3422 is an acute angle. In the figure, the angle between the light incident surface 3421 and the light emitting surface 3422 is angle a, and angle a is an acute angle. The size of the acute angle can be determined according to actual conditions and is not limited here. Among them, the refraction part 342 is arranged on the light refraction component 341, and the light incident surface 3421 of the refraction part 342 is in contact with the surface of the light refraction component 341 facing the projection lens 650, and the refraction part 342 and the light refraction component 341 constitute the refraction device 340. The non-projection light emitted from the light refraction component 341 enters the refraction portion 342 through the light incident surface 3421 . Since the angle between the light emitting surface 3422 and the light incident surface 3421 is an acute angle, the non-projection light is refracted to an area outside the projection lens 650 when emitted from the light emitting surface 3422 .

[0055] Figure 4A A refraction device 440 according to another embodiment of the present application is shown, which is another implementation scheme of the refraction device. Figure 4A As shown, the refraction device 440 includes a first prism 441 and a combined prism 442 that are arranged in close contact. The first prism 441 may be the first prism 3411 described above, and the combined prism 442 may be formed by integrating the second prism 3412 and the refraction portion 342 described above. Figure 4B As shown, the first prism 441 is configured to transmit the projection light 141 and non-projection light 142 reflected by the light modulator 430 into the combined prism 442; the combined prism 442 is configured to transmit the projection light 141 emitted by the first prism 441 into the projection lens 450, and transmit the non-projection light 142 emitted by the first prism 441 into the area outside the projection lens 450.

[0056] In the embodiment of the present application, the first prism 441 may be a triangular prism, and the combined prism 442 may be a quadrilateral prism obtained by integrally forming two triangular prisms.

[0057] Figure 5 FIG. 5 shows a refraction device 540 according to another embodiment of the present application, which is another implementation scheme of the refraction device. Figure 5 As shown, the refraction device 540 includes a light refraction component 541 and a refraction portion 542 which are arranged in close contact, wherein the refraction portion 542 may be a lens. Specifically, the light refraction component 541 is configured to emit the projection light reflected by the light modulator into the refraction portion 542 to the projection lens, and emit the non-projection light reflected by the light modulator into the refraction portion 542, and the refraction portion 542 can emit the non-projection light emitted by the light refraction component 541 into the area outside the projection lens through the refraction effect (or focusing effect) of the lens.

[0058] In one example, the refraction portion 542 may be an incomplete convex lens, which may be a semicircular convex lens, a convex lens smaller than a semicircle, or a convex lens larger than a semicircle.

[0059] In another example, the refraction portion 542 may include a Fresnel lens, which refracts the non-projection light through concentric circles in the Fresnel lens, so that the non-projection light is emitted to an area outside the projection lens.

[0060] In the embodiment of the present application, the refractive part 542 includes a light-emitting surface and a light-entering surface. The light-emitting surface of the refractive part 542 faces the projection lens, and the light-emitting surface is a curved surface. The light-entering surface fits the surface of the light refraction component 541 facing the projection lens, wherein the angle between the tangent line at any point on the curved surface and the light-entering surface is an acute angle. The non-projection light emitted from the light refraction component 541 enters the refractive part 542 through the light-entering surface. Since the angle between the tangent line at any point on the light-emitting surface and the light-entering surface is an acute angle, the non-projection light is refracted to an area outside the projection lens when it is emitted from the light-emitting surface.

[0061] In the embodiments of the present application, Figure 5 As shown, the light refraction component 541 includes a first prism 5411 and a second prism 5412 that are arranged in a close relationship, and the refraction portion 542 is provided on a portion of the surface of the second prism 5412 that faces the projection lens. The description of the first prism 5411 and the second prism 5412 can be referred to above, and will not be repeated here. In addition, the refraction portion 542 can be integrally formed with the second prism 5412.

[0062] Figure 6 FIG. 6 shows a refraction device 640 according to another embodiment of the present application, which is another implementation scheme of the refraction device. Figure 6 As shown, the refraction device 640 includes a light refraction component 641 and a refraction part 642 which are arranged in close contact, wherein the refraction part 642 includes a plurality of prism units. Specifically, the light refraction component 641 is configured to emit the projection light reflected by the light modulator into the refraction part 642 to the projection lens, and emit the non-projection light reflected by the light modulator into the refraction part 642, and the plurality of prism units in the refraction part 642 can emit the non-projection light emitted by the light refraction component 641 into the area outside the projection lens.

[0063] In the embodiment of the present application, a plurality of prism units are disposed on at least a portion of the surface of the light refraction component 641 facing the projection lens, and may be arranged in a stepped manner so that the refraction portion 642 is stepped, thereby avoiding physical interference between the refraction device 640 and the projection lens.

[0064] In an embodiment of the present application, the prism unit may be a microprism, and the refractive portion 642 is composed of a plurality of microprisms arranged in a stepped manner, wherein the refractive portion 642 may be similar in shape to a Fresnel lens, thereby achieving the purpose of reducing the volume while realizing the same function as above.

[0065] In the embodiment of the present application, each prism unit includes a light-emitting surface and a light-entering surface, the light-emitting surface faces the projection lens, and the angle between the light-entering surface and the light-emitting surface is an acute angle. For any prism unit, the non-projection light emitted by the light refraction component 641 enters the corresponding prism unit through the light-entering surface. Since the angle between the light-emitting surface and the light-entering surface is an acute angle, the non-projection light is refracted to an area outside the projection lens when it is emitted through the light-emitting surface.

[0066] In the embodiments of the present application, the prism units may also have different heights, or the same height, or some may have the same height and some may have different heights, which may be reasonably selected according to actual needs.

[0067] In the embodiments of the present application, Figure 6 As shown, the light refraction component 641 includes a first prism 6411 and a second prism 6412 that are arranged in close contact, and the refraction portion 642 is provided on a portion of the surface of the second prism 6412 that faces the projection lens. The description of the first prism 6411 and the second prism 6412 can be referred to above, and will not be repeated here. In addition, the refraction portion 642 can be integrally formed with the second prism 6412.

[0068] The present application also provides a projector. The projector includes a refraction device, a light modulator and a projection lens, the refraction device is located between the projection lens and the light modulator, the light modulator is configured to modulate the light reflected into the refraction device into projection light and non-projection light, the refraction device includes a light refraction component, a refraction part is arranged along the edge of the light exit surface of the light refraction component; the refraction part includes an incident surface and an exit surface, the incident surface and the exit surface form a predetermined angle, and the incident surface is arranged on a side of the refraction part close to the light modulator.

[0069] The projector may be a digital light processing projector (DLP), an LCoS (liquid crystal on silicon) projector, a liquid crystal display (LCD) projector, a 3LCD projector, etc., without limitation. The refraction device may be implemented as the refraction device 340, 440, 540, 640 described above, and the description above may be referred to, and no further description is given here.

[0070] Based on the projector, by setting a refraction device including a refraction part, and by making the incident surface and the exit surface of the refraction part form a certain angle, the refraction part can refract the non-projection light reflected by the light modulator 240 into the refraction device to an area outside the projection lens, thereby avoiding the non-projection light emitted by the refraction device from entering the projection lens, and preventing stray light from being formed in the projection lens due to the non-projection light, thereby ensuring the contrast of the projection picture and improving the imaging quality.

[0071] In the embodiment of the present application, the refractive index of the refractive portion is less than or equal to the refractive index of the light refractive component. When the refractive index of the refractive portion is the same as that of the light refractive component, the two can be made of the same material, or can be made of different materials with the same refractive index. When the refractive index of the refractive portion is different from that of the light refractive component, the two can be made of different materials.

[0072] In the embodiment of the present application, the predetermined angle satisfies the following conditions:

[0073] α<θ-arccos(1 / N)

[0074] Wherein, α is a predetermined angle, N is a refractive index of the refractive portion, and θ is an angle between the non-projection light reflected by the light modulator into the light refraction component and the light emitting surface of the light refraction component.

[0075] In an embodiment of the present application, the refraction portion is located outside the area illuminated by the projection light reflected by the light modulator into the light refraction component. Optionally, the incident surface of the refraction portion covers the non-projection light emitted from the light refraction component, and is used to guide the non-projection light to the outside of the projection lens optical system. Specifically, the refraction portion is located outside the area illuminated by the projection light reflected by the light modulator into the light refraction component to ensure that the projection light does not enter the refraction portion, and the incident surface of the refraction portion covers the non-projection light emitted from the light refraction component to ensure that all non-projection light can enter the refraction portion, thereby avoiding the situation where non-projection light is missed and is incident on the projection lens. Exemplarily, in Figure 3B The incident surface of the middle and refractive parts 342 covers the non-projection light 132 emitted from the light refraction component 341. Figure 4B In the embodiment, the incident surface of the refractive portion covers the non-projected light 142 emitted by the light refraction component.

[0076] In the related technology, combined Figure 7 The light 170 emitted by the light source is modulated by the light modulator 730 and is divided into a projection light 171 and a non-projection light 172. The projection light 171 can be incident on the projection lens for imaging after being guided by the refraction device, while the non-projection light 172 is refracted by the refraction device to an area outside the projection lens. On the one hand, the non-projection light 172 refracted to an area outside the projection lens forms stray light in the cavity 760 of the projector. After the stray light is absorbed by the cavity 760, the temperature of the cavity 760 increases, which creates a burden on the heat dissipation of the projector. On the other hand, the non-projection light 172 partially refracted to an area outside the projection lens is concentratedly irradiated to a local position in the cavity 760, which will cause volatiles to be generated at the irradiated position. The generated volatiles will pollute the optical components in the projector cavity 760.

[0077] In view of this, the present application provides a projector. Figure 8As shown, the projector 800 includes a refraction device 810, a light shaping device 820, a light collecting device 830, a light modulator 840 and a projection lens 850. The light shaping device 820 is used to shape the non-projection light emitted by the refraction device 810, and the light collecting device 830 is used to collect the non-projection light shaped by the light shaping device 820.

[0078] The projector 800 may be a digital light processing projector (DLP), an LCoS (liquid crystal on silicon) projector, a liquid crystal display (LCD) projector, a 3LCD projector, etc., without limitation. The refraction device 810 may be implemented as the refraction device 340, 440, 540, 640 described above, and the description above may be referred to, and no further description is given here.

[0079] Based on the projector 800, after the light emitted by the light source reaches the light modulator, it is modulated by the light modulator into projection light and non-projection light, wherein the projection light modulated by the light modulator is guided by the refraction device 810 and then incident on the projection lens for imaging, and the non-projection light modulated by the light modulator is refracted by the refraction device 810 to the area outside the projection lens, and the non-projection light is shaped by the light shaping device 820, and the shaped non-projection light is incident on the light collecting device 830, and the non-projection light is collected by the light collecting device 830, which, on the one hand, avoids the non-projection light from forming stray light in the cavity of the projector 800, and does not cause the temperature of the cavity of the projector 800 to rise, and on the other hand, avoids the non-projection light from being concentrated on a local position in the cavity to produce volatiles, and does not cause pollution to the optical components in the cavity.

[0080] In the embodiments of the present application, Fig. 9A and Fig. 9BThe light collecting device 830 includes a light absorbing component 832, which is configured to absorb the non-projection light 181 collected by the light collecting device 830. An optical window 831 is provided between the light absorbing component 832 and the light shaping device 820. The optical window 831 is configured to spatially isolate the light absorbing component 832 from the light shaping device 820, and to transmit the non-projection light 181 shaped by the light shaping device 820 to the light absorbing component 832. The light collecting device 830 also includes a heat dissipation portion 833, which is disposed outside the projector to dissipate heat to the outside. Specifically, the non-projection light 181 is shaped by the light shaping device 820, and the shaped non-projection light 181 is projected from the optical window 831 into the light absorption component 832, and the non-projection light 181 is absorbed by the light absorption component 832. After the light absorption component 832 absorbs the non-projection light 181, the temperature of the light absorption component 832 increases, and the heat of the light absorption component 832 is dissipated to the outside of the projector through the heat dissipation part 833, so that the non-projection light 181 is effectively collected by the light collecting device 830, and the heat dissipation burden of the light collecting device 830 caused by the non-projection light 181 can be avoided.

[0081] In the embodiment of the present application, the light shaping device 820 may include optical elements such as lenses, reflective cups, prisms, etc., for example, Fig. 9B As shown, the light shaping device 820 may be a convex lens.

[0082] In the embodiments of the present application, Fig. 9B , the light absorbing component 832 includes a shell 8321 and a light absorbing part 8322 disposed in the shell 8321, wherein the shell 8321 is configured to collect the non-projection light 181 guided into it by the optical window 831, and the light absorbing part 8322 is configured to absorb the non-projection light 181 in the shell 8321. Specifically, the shell 8321 is used as a sealed collection device, and the non-projection light 181 is sealed and collected after entering the shell 8321 to prevent the non-projection light 181 from escaping, and the sealed and collected non-projection light 1001 is then absorbed by the light absorbing part 8322. Among them, the light absorbing part 8322 can be made of a light absorbing material. The shape of the shell 8321 can be any suitable shape such as a sphere, a truncated cone, a rectangular parallelepiped, etc., which is not limited to this. Correspondingly, the shape of the light absorbing component 832 is not limited to the plane shape shown in the figure, and can also be any other suitable shape such as a concave shape or a convex shape.

[0083] In the related art, the light emitted by the light source is modulated by a light modulator and divided into projection light and non-projection light. The projection light can be guided by a refraction device and then incident on a projection lens for imaging. The non-projection light is refracted by the refraction device into a light collecting device and is absorbed and radiated to the outside of the projector in the form of heat. In the above process, the non-projection light is wasted.

[0084] In view of this, the present application provides a projector. The projector includes a refraction device, a light shaping device and a light collecting device, the light shaping device is used to shape the non-projection light emitted by the refraction device, and the light collecting device is used to collect the non-projection light shaped by the light shaping device, wherein the light collecting device includes a light output component, and the light output component is configured to output the non-projection light collected by the light collecting device.

[0085] The projector may be a digital light processing projector (DLP), an LCoS (liquid crystal on silicon) projector, a liquid crystal display (LCD), a 3LCD projector, etc., without limitation. The refraction device may be implemented as the refraction device 340, 440, 540, 640 described above, the light shaping device may be implemented as the light shaping device 820 described above, and the light collecting device may be implemented as the light collecting device 830 described above. Please refer to the description above, and no further description will be given here.

[0086] Based on the projector, after the light emitted by the light source reaches the light modulator, it is modulated by the light modulator into projection light and non-projection light, wherein the projection light modulated by the light modulator is guided by the refraction device and then incident on the projection lens for imaging, and the non-projection light modulated by the light modulator is refracted by the refraction device to the area outside the projection lens, and the non-projection light is shaped by the light shaping device, and the shaped non-projection light is incident on the light collecting device, and the non-projection light collected by the light collecting device is output by the light output component, thereby effectively utilizing the non-projection light and avoiding the waste of the non-projection light.

[0087] In the embodiments of the present application, the light emitted by the light source is a time-sequential light composed of various colors, which is seen by the naked eye as white light, that is, the projection light and the non-projection light generated after modulation by the light modulator constitute complementary light. For example, if the projector outputs a red picture, the projection light is red, and the non-projection light is the complementary light of red, cyan. Since the color and brightness of each area of ​​the projection picture will be different during normal projection, the color and brightness of the non-projection light will also change with the color and brightness of the useful light. In this embodiment, the characteristic of the non-projection light changing with the projection picture is utilized, and the non-projection light is output through the light output component, which can be used to indicate the working status of the projector.

[0088] In the embodiments of the present application, Figures 10A to 10C As shown, the light output component includes a light guide element 841 and an output terminal 842 connected to each other, wherein the light guide element 841 is configured to transmit the non-projection light 1001 therein to the output terminal 842, so that the output terminal 842 outputs the non-projection light 1001. Among them, the light guide element 841 can be an optical waveguide or other element for transmitting light. Taking the optical waveguide as an example, the light guide element 841 can be an integrated optical waveguide, including a planar (thin film) dielectric optical waveguide or a strip dielectric optical waveguide, etc. The light guide element 841 can also be a cylindrical optical waveguide, that is, an optical fiber. Exemplarily, in this embodiment, the light guide element 841 is selected as an optical fiber. The diameter and number of the optical fiber are related to the irradiation area of ​​the non-projection light 1001.

[0089] It should be noted that if Fig. 10B As shown, the light collecting means may include a light output assembly 84, or, as shown Fig. 10C As shown, it may also include multiple light output components 84. The former light output device includes a light guide element 841 and an output terminal 842, and the latter light output device includes multiple light guide elements 841 and multiple output terminals 842.

[0090] In the embodiment of the present application, the output terminal 842 is an interface, and the interface is configured to connect to a display device so as to output the non-projection light 1001 transmitted therein by the light guide element 841 to the display device for display; or the output terminal 842 is an indicator, and the indicator is configured to be able to present the non-projection light 1001 transmitted therein by the light guide element 841. Taking the output terminal 842 as an interface as an example, the interface can be a universal interface or a specific interface, so as to be connected to a corresponding display device, and after the non-projection light collected by the light collecting device enters the light guide element 841, the light guide element 841 transmits the non-projection light 1001 to the interface, and the non-projection light 1001 is output to the display device through the interface, and the display device displays the non-projection light 1001. Taking the output terminal 842 as an indicator as an example, after the non-projection light collected by the light collecting device enters the light guide element 841, the light guide element 841 transmits the non-projection light 1001 to the indicator, and the non-projection light 1001 is displayed and output through the indicator. The working state of the projector can be represented by the display state of the indicator, wherein the indicator can display and output the non-projection light 1001 in the form of a pattern, a line, etc., or the output non-projection light 1001 can also be used as an illumination light.

[0091] In summary, according to the projector of the embodiment of the present application, the non-projection light is refracted to the area outside the projection lens through the refraction part, so that the non-projection light emitted by the refraction device is prevented from entering the projection lens, and stray light will not be formed in the projection lens due to the non-projection light, thereby ensuring the contrast of the projection picture and improving the imaging quality. In addition, according to the projector of the embodiment of the present application, the non-projection light emitted by the refraction device is collected by the light collecting device, which, on the one hand, avoids the non-projection light from forming stray light in the cavity of the projector and does not cause the temperature of the cavity of the projector to rise, and on the other hand, avoids the non-projection light from being concentrated on a local position in the cavity to produce volatiles and does not cause pollution to the optical elements in the cavity; the non-projection light collected by the light collecting device is output through the light output component, so that the non-projection light can be effectively utilized and the waste of non-projection light can be avoided.

[0092] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0093] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0094] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0095] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A projector, comprising a refraction device, a projection lens and a light modulator, wherein the refraction device is located between the projection lens and the light modulator, and the light modulator is configured to modulate the light reflected into the refraction device into projection light and non-projection light, characterized in that: The refraction device comprises a light refraction component, and a refraction portion is arranged along the edge of the light emitting surface of the light refraction component; The refraction part comprises an incident surface and an exit surface, the incident surface and the exit surface form a predetermined angle, and the incident surface is arranged on a side of the refraction part close to the light modulator; The projector further comprises a light shaping device and a light collecting device, wherein the light shaping device is used to shape the non-projection light emitted by the refraction device, and the light collecting device is used to collect the non-projection light shaped by the light shaping device; Wherein, the light collecting device comprises a light absorbing component, and the light absorbing component is configured to absorb the non-projection light collected by the light collecting device; Alternatively, the light collecting device comprises a light output component, and the light output component is configured to output the non-projection light collected by the light collecting device.

2. The projector according to claim 1, wherein: The refractive index of the refractive portion is less than or equal to the refractive index of the light refraction component.

3. The projector according to claim 1, wherein: The predetermined angle satisfies the following conditions: α<θ-arccos(1 / N) Wherein, α is the predetermined angle, N is the refractive index of the refractive portion, and θ is the angle between the non-projection light reflected by the light modulator into the light refraction component and the light emitting surface of the light refraction component.

4. The projector according to claim 1, wherein: The refraction portion is located outside the area illuminated by the projection light reflected by the light modulator into the light refraction component.

5. The projector according to claim 1, wherein: The refraction part is a prism or a lens, wherein the prism includes a plurality of prism units, and the lens includes a Fresnel lens.

6. The projector according to claim 1, wherein: The light refraction component comprises a first prism and a second prism which are arranged in close contact with each other. The refraction portion is arranged at an edge position of a light emitting surface of the second prism. The refraction portion and the second prism are formed in one piece.

7. The projector according to claim 1, wherein: The refracting portion is used to refract the non-projection light to an area outside the projection lens.

8. The projector according to claim 1, wherein: An optical window is provided between the light absorbing component and the light shaping device; The optical window is configured to spatially isolate the light absorbing component and the light shaping device, and is configured to transmit the non-projected light shaped by the light shaping device to the light absorbing component; The light collecting device further comprises a heat dissipation portion, which is arranged outside the projector and is used for dissipating heat to the outside.

9. The projector according to claim 1, wherein: The light output component includes a light-guiding element and an output terminal connected to each other, wherein the light collecting device is configured to guide the non-projection light incident therein to the light-guiding element, and the light-guiding element is configured to transmit the non-projection light therein to the output terminal so that the output terminal outputs the non-projection light.

10. The projector according to claim 9, characterized in that The output terminal is an interface, and the interface is configured to be connected to a display device so as to output the non-projection light transmitted therein by the light guide element to the display device for display; or The output terminal is an indicator configured to present the non-projected light transmitted therein by the light guide element.

Images