Light recycling assembly and projection device

Abstract

The embodiment of the present application provides a light recycling component and a projection device, wherein the light recycling component includes a shaper and a polarizer component, wherein the shaper is used to shape the illumination light into image light and non-image light with a preset spot shape, wherein the image light is irradiated to the polarizer component, and the non-image light is recovered by the shaper; the polarizer component splits the image light into a first polarized light and a second polarized light having a polarization state different from that of the first polarized light, wherein the first polarized light is used for optical modulation, and the second polarized light is recovered by the polarizer component, and the non-image light and the second polarized light together constitute the recovered light. The projection system also includes a light output component, a light valve, and a light recycling component, wherein the light output component is used to emit illumination light and reflect the recovered light to the light recycling component, wherein the light valve includes an imaging surface, and the preset spot shape of the first polarized light matches the shape of the imaging surface. The light recycling component and the projection system provided by the present application can shape and recycle the illumination light, realize light circulation, and effectively improve the light utilization efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of optical instruments, and in particular to a light recycling component and a projection device. Background Art

[0002] The principle of a traditional LCD (Liquid Crystal Display) projector is very similar to that of a traditional movie projector and slide projector, that is, an LCD panel is used as the image source in the place where the original movie film or slide was, and strong light is projected through a high-power bulb or LED (Light Emitting Diode) on the back, and then after light shaping, imaging, and keystone correction, the image on the LCD panel is magnified and projected onto a white screen or white wall through the projector lens, so that users can obtain images of dozens to hundreds of inches in size and get the effect and experience of watching a movie.

[0003] However, existing LCD projectors have problems such as being too large, having many optical components, and being inefficient. Figure 1 As shown, in order to improve the transmittance of the panel, the existing LCD panel 100 generally polarizes the illumination light through the light enhancement film in advance when in use, which can effectively reduce the light loss caused by the first polarizer 110, and then the illumination light passes through the black film 120, the TFT electrode layer 130, the liquid crystal 140, the transparent electrode layer 150, the color film 160 and the second polarizer 170 in sequence. The LCD projection has the problem of low efficiency when in use, mainly due to the following reasons:

[0004] 1. Currently, consumers' requirements for projectors are mainly portability (small size) and high resolution, which puts higher requirements on LCD panels. However, the existing mainstream processing technology can only achieve a TFT (Thin Film Transistor) wire size of 12 microns in length and 3.5 microns in width, and the TFT wire size will not decrease due to the reduction of pixels, resulting in the aperture ratio (the proportion of the effective area through which light can pass) of existing LCD panels generally being below 50%, affecting the light effect;

[0005] 2. In order to prevent crosstalk between pixels of different colors and protect transparent electrodes and TFT wires, two layers of black films 120 are provided on the LCD panel, which also causes a loss in light efficiency;

[0006] 3. The existing LCD panel uses a color filter and a black film to divide a large pixel into three RGB small pixels to achieve full-color display. However, since the backlight source is white light, the color filter can only allow light of a specific color (spectrum) to pass through, and the rest of the light will not be used by the subsequent optical system, which will eventually cause about 66% energy efficiency loss and low utilization rate.

[0007] Single DLP (Digital Light Processing) and LCOS (Liquid Crystal on Silicon) display technology can achieve full-color display without reducing light efficiency. Specifically, the light source outputs three colors of RGB illumination light in a time sequence (within one frame), and the spatial light modulator modulates the light of a specific color in a time sequence to achieve full-color display of one frame. However, this method will cause the RGB colors to not overlap at the edge of the color image, also known as the rainbow effect (color breakup). The reason for the formation of the rainbow effect is that within an image frame, the imaging positions of the RGB sub-frame images displayed in time sequence on the retina of the human eye cannot overlap, which is more obvious for color images moving on the screen and will cause dizziness to the audience, and still needs to be improved. Summary of the invention

[0008] The purpose of the present application is to provide a light recycling component and a projection device to solve the above problems. The present application embodiment achieves the above purpose through the following technical solutions.

[0009] The embodiment of the present application provides a light recycling component, including a shaper and a polarizer component, wherein:

[0010] The shaper is used to shape the illumination light input to the light recycling component to form non-image light and image light with a preset spot shape, the image light is irradiated to the polarizer component, and the non-image light is recycled by the shaper; the polarizer component is used to split the image light into a first polarized light and a second polarized light with a polarization state different from that of the first polarized light, the first polarized light is used for optical modulation, and the second polarized light is recycled by the polarizer component; wherein the non-image light and the second polarized light together constitute the recycled light.

[0011] In one embodiment, the shaper is integrally provided with the polarizer assembly.

[0012] In one embodiment, the shaper includes a first surface and a second surface relative to each other, the illumination light is incident from the first surface, and the image light is emitted from the second surface; the polarizer assembly includes a third surface and a fourth surface, the image light is incident from the third surface, and the first polarized light is emitted from the fourth surface; the third surface abuts against the second surface.

[0013] In one embodiment, the shaper further includes two symmetrically arranged reflecting parts, each of which is arranged and connected between the first surface and the second surface, and each of which is used to reflect the non-image light to another reflecting part and recycle the non-image light reflected by another reflecting part.

[0014] In one embodiment, the shape of the second surface of the shaping device is a preset shape, and the illumination light is shaped to form the image light.

[0015] In one embodiment, the polarizer assembly includes two interconnected polarization splitter prisms, each of the polarization splitter prisms includes the third surface and the fourth surface, and a polarization splitter film located between the third surface and the fourth surface, and the two polarization splitter films are perpendicular to each other and symmetrically arranged with respect to each other; each polarization splitter film is used to transmit the first polarized light, and to reflect the second polarized light to another polarization splitter film, and to recover the second polarized light reflected by the other polarization splitter film.

[0016] An embodiment of the present application also provides a projection system, comprising a light emitting component, a light valve and the light recycling component described above, wherein the light recycling component and the light valve are sequentially arranged on the light emitting light path of the light emitting component; wherein the light emitting component is used to emit the illumination light and reflect the recycled light to the light recycling component; the light valve comprises an imaging surface for modulating the light irradiated onto the imaging surface; the light recycling component guides the first polarized light to the imaging surface, and guides the recycled light to the light emitting component, wherein the preset spot shape of the first polarized light is adapted to the shape of the imaging surface.

[0017] In one embodiment, the light output component includes a laser module and a color wheel, the laser module is used to emit excitation light; the color wheel is arranged on the light output path of the laser module, is used to receive the excitation light and generate illumination light, and is used to diffusely reflect the recycled light recycled to the color wheel.

[0018] In one embodiment, the color wheel includes a transparent substrate, a scattering plate and a polarizer. The transparent substrate includes a substrate light incident surface and a substrate light emitting surface opposite to each other. The scattering plate is arranged on the substrate light incident surface, and the polarizer is arranged on the substrate light emitting surface. The excitation light passes through the scattering plate and the polarizer in sequence to form illumination light. The polarizer is also used to split the recycled light recovered to the polarizer and partially reflect it to the light recycling component.

[0019] In one embodiment, the color wheel includes a reflective substrate, a phosphor layer and a scattering sheet. The reflective substrate includes a substrate reflective surface. The phosphor layer and the scattering sheet are arranged on the substrate reflective surface. The excitation light is incident on the phosphor layer and excites to generate fluorescence as illumination light. The phosphor layer is also used to diffusely reflect the recycled light recovered to the phosphor layer; the excitation light is incident on the scattering sheet and reflected to form illumination light. The scattering sheet is also used to diffusely reflect the recycled light recovered to the scattering sheet.

[0020] In one embodiment, the projection display device further includes a collecting lens group, which is disposed on the light path between the color wheel and the light recycling assembly, and is used to collect the illumination light to the light recycling assembly, and to collect the recycled light to the color wheel.

[0021] In one embodiment, the projection device further includes a microlens array, and the microlens array is arranged on the imaging surface.

[0022] Compared with the prior art, the light recycling component provided in the embodiment of the present application is equipped with both a shaper and a light deflection component, and can realize beam shaping and recycling through only one component, thereby reducing the volume of the entire optical path design, reducing costs, and improving light utilization efficiency, and can be flexibly applied to various projection, lighting and other display scenes; at the same time, in the projection system provided in the embodiment of the present application, the illumination light is shaped and split by the light recycling component to form a first polarized light emitted to the imaging surface. Since the spot shape of the first polarized light is adapted to the shape of the imaging surface, all areas of the imaging surface can be illuminated by the light beam, and the light beam finally incident on the imaging surface is a light beam with a specific polarization direction, which can effectively avoid the problem of color crosstalk. The light recycling component is also used to guide the remaining illumination light to the light emitting component to form recycled light. After being reflected by the light emitting component, the recycled light can be re-incident to the light recycling component to realize light circulation, effectively improving the light utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of an LCD liquid crystal panel in the related art.

[0025] Figure 2 It is a schematic diagram of the structure of the projection device provided in an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the projection of the light beam on the shaper provided in an embodiment of the present application.

[0027] Figure 4 It is an exploded schematic diagram of the light recycling component provided in the embodiment of the present application.

[0028] Figure 5 is another structural schematic diagram of the projection device provided in an embodiment of the present application.

[0029] Figure 6 yes Figure 5 The embodiment shown provides a light path diagram of a projection device.

[0030] Figure 7 It is a schematic diagram of the structure of a projection device provided in another embodiment of the present application.

[0031] Figure 8 yes Figure 7 The embodiment shown provides a light path diagram of a projection device. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the embodiments of the present application, the embodiments of the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the examples of this application are only for the purpose of describing specific implementations and are not intended to limit this application.

[0034] It should be noted that the light recycling component provided in the embodiment of the present application can be used independently and does not need to rely on any projection device. The following is a detailed description of its actual application in the projection device, aiming to enable those skilled in the art to understand the present application more clearly.

[0035] Figure 2 This is a schematic diagram of the structure of the projection device provided in the embodiment of the present application. Figure 2 As shown, the projection device 200 includes a light emitting component 210, a light recycling component 220 and a light valve 230, and the light recycling component 220 and the light valve 230 are sequentially arranged on the light emitting light path of the light emitting component 210. The light valve 230 includes an imaging surface 231, and the imaging surface 231 is used to modulate the light incident on the imaging surface 231 to form an optical image. The light emitting component 210 is used to emit an illumination light L1, and the light recycling component 220 is used to shape and split the illumination light L1 to form a first polarized light L1 emitted to the imaging surface 231. 41, and guides the remaining illumination light to the light output component 210 to form the recycled light L3, the first polarized light L 41 The light spot shape is adapted to the shape of the imaging surface 231. The light emitting component 210 is also used to reflect the recycled light L3 to the light recycling component 220.

[0036] The light valve 230, also known as a liquid crystal light valve, is a key component for modulating the illumination light emitted from the light recycling component 220. Usually, the light valve 230 uses a light beam with a specific polarization direction. 41 The projection device 200 may further include a lens 240 , and the light beam modulated and output by the imaging surface 231 may be projected onto a screen to form a projection image after being imaged by the lens 240 .

[0037] Figure 3 is a schematic diagram of the projection of the light beam on the shaper provided in the embodiment of the present application, see Figure 2 and Figure 3 As shown, the imaging surface 231 is usually rectangular. When the light emitting component 210 is a fluorescent light source, the cross-sectional shape of the light spot is usually circular or approximately circular because the fluorescent light emission characteristic is Lambertian light emission. If the entire imaging surface 231 is to be covered by the circular light beam, the light at the edge of the light beam will be projected to the area outside the imaging surface 231. Since this part of the light cannot enter the imaging surface 231, it causes a waste of light and leads to low light utilization efficiency. If the cross-sectional area of ​​the light beam is to be reduced so that the entire circular light beam is transmitted into the imaging surface 231, part of the imaging surface 231 will not be illuminated by the light beam, so that this part of the area cannot be imaged, and the modulation function of the imaging surface cannot be maximized.

[0038] The projection device 200 shapes and splits the illumination light L1 through the light recycling component 220 to form a first polarized light L1 emitted to the image display surface 231. 41 , due to the first polarized light L 41 The shape of the light spot is adapted to the shape of the imaging surface 231, so that all areas of the imaging surface 231 can be illuminated by the light beam, and the light beam finally incident on the imaging surface 231 is a light beam with a specific polarization direction, which can effectively avoid the color crosstalk problem. The light recycling component 220 is also used to guide the remaining illumination light to the light output component 210 to form the recycled light L3. The recycled light L3 can be re-incident to the light recycling component 220 after being reflected by the light output component 210, thereby realizing light circulation and effectively improving the light utilization efficiency. At the same time, since only one light recycling component is provided, the shaping and recycling of the light beam are realized at the same time, which reduces the volume of the entire optical path design and reduces the cost.

[0039] The light recycling component 220 may include a shaper 221 and a polarizer component 222, wherein the shaper 221 is used to shape the illumination light input into the light recycling component 220 to form non-image light and image light with a preset spot shape, the image light is irradiated to the polarizer component 222, the non-image light is recovered by the shaper 221, the polarizer component 222 is used to split the image light into a first polarized light and a second polarized light having a polarization state different from that of the first polarized light, the first polarized light is used for optical modulation, the second polarized light is recovered by the polarizer component 222, and the non-image light and the second polarized light together constitute the recycled light.

[0040] Specifically, the shaper 221 is used to shape the illumination light L1 into the image light L emitted to the imaging surface 231. 22 and the non-image light L emitted to the outside of the imaging surface 231 21 and convert at least part of the non-image light L 21 The polarizer component 222 is arranged on the light output path of the shaper 221 to convert the image light L 22 Divided into the first polarized light L 41 and the first polarized light L 41 The second polarized light L 42 , and the first polarized light L 41 The second polarized light L 42 Guided to the light output component 210 as the recovered light L3.

[0041] It should be noted that Figure 2 Only the light transmission diagram of the upper half of the optical axis X of the light recycling assembly 220 is shown, and the same is true for the symmetrical parts.

[0042] In this embodiment, the light beam emitted from the light emitting component 210 to the light recycling component 220 includes the illumination light L1 emitted by the light emitting component 210 and the recycled light reflected by the light recycling component 220. 21 The image light L is a large-angle light in the light beam emitted from the light emitting component 210 to the light recycling component 220. 22 It is a small angle light in the light beam emitted from the light emitting component 210 to the light recycling component 220. The angle between the large angle light and the optical axis X of the light recycling component 220 can be greater than the set angle, and the angle between the small angle light and the optical axis X of the light recycling component 220 can be less than the set angle.

[0043] In this embodiment, the non-image light L 21 Including the light in area A and the light in area C, the shaper 221 can be used only to guide the light in area A to the light output component 210, that is, to project the non-image light L outside the two sides of the imaging surface 231 in the length direction. 21The non-image light L that could not be projected onto the imaging surface 231 is guided to the light emitting component 210. 21 The light can be recycled to the light emitting component 210 and returned to the light recycling component 220 after being reflected by the light emitting component 210, thereby realizing the recycling of light and improving the light efficiency.

[0044] In some embodiments, the shaper 221 can also be used to guide the light in area A and the light in area C to the light output component 210, that is, to direct all non-image light L 21 Of course, the shaper 221 can also be used to guide the light in area C to the light emitting component 210, that is, to project the non-image light L outside the two sides of the imaging surface 231 in the width direction. 21 Guided to the light output component 210.

[0045] Image light L 22 The light of area B, the shaper 221 transmits the image light L 22 The polarizer assembly 222 splits the light into the first polarized light L 41 and the second polarized light L 42 , the first polarized light L 41 The imaging surface 231 is completely covered so that all areas on the imaging surface 231 can be imaged.

[0046] It should be noted that when the shape of the imaging surface 231 is a preset shape, the light emitting surface of the shaper 221 (that is, the second surface hereinafter) is set to be a preset shape so that the shaped first polarized light L 41 When the shape of the imaging surface 231 is a triangle or a trapezoid or other preset shapes, the light emitting surface of the shaper 221 is set so that the shaped first polarized light L 41 The preset spot shape is a corresponding triangle or trapezoid or other preset shapes. Those skilled in the art can adjust the light exit surface of the shaper 221 according to the actual structure of the light valve 230 so that the shaped first polarized light L 41 The preset spot shape meets the requirements.

[0047] The first polarized light L 41 It can be P polarized light or S polarized light. 41 When it is P polarized light, the second polarized light L 42 is S polarized light. 41 When it is S polarized light, the second polarized light L 42 In this embodiment, the light valve 230 is suitable for modulating the P polarized light. 41 is P polarized light, the second polarized light L 42 It is S polarized light.

[0048] In this embodiment, the shaper 221 includes a first surface 2211 and a second surface 2212. The illumination light L1 is incident from the first surface 2211, and the image light L 22 The polarizer assembly 222 includes a third surface 2221 and a fourth surface 2222. The image light L 22 The first polarized light L is incident from the third surface 2221. 41 The light is emitted from the fourth surface 2222, and the third surface 2221 abuts against the second surface 2212. Thus, the shaper 221 and the polarizer assembly 222 are connected as one, which reduces the space occupied by the light recycling assembly 220, facilitates processing and manufacturing, and can avoid relative displacement or misalignment between the shaper 221 and the polarizer assembly 222 when the temperature changes.

[0049] The area of ​​the third surface 2221 may be greater than or equal to the area of ​​the second surface 2212, so that the third surface 2221 can receive all the image light L emitted from the second surface 2212. 22 , the utilization rate of light energy is the highest.

[0050] In some embodiments, the third surface 2221 is bonded to the second surface 2212 by adhesive, and the adhesive may be adhesive having a refractive index close to that of the material of the shaper 221 and the polarizer assembly 222. Of course, adhesive may not be provided, but the light recycling assembly bracket may be used to fix the shaper 221 and the polarizer assembly 222 by external force to enhance light transmittance.

[0051] Figure 4 is an exploded schematic diagram of a light recycling assembly provided in an embodiment of the present application, combined with Figure 2 and Figure 4 As shown, the shaper 221 further includes two reflective portions 2213 symmetrical about the optical axis X of the light recycling component 220, each of the reflective portions 2213 is disposed and connected between the first surface 2211 and the second surface 2212, and each of the reflective portions 2213 is used to convert the non-image light L 21 The non-image light L reflected by the other reflecting portion 2213 is reflected to the other reflecting portion 2213. 21 The non-image light L 21 recycling.

[0052] The reflective portion 2213 may be a plane or a serrated concave-convex surface, as long as it can reflect light. The reflective portion 2213 may also be coated with an anti-reflection film to enhance the reflective effect of the reflective portion 2213 and reduce the light energy loss during reflection.

[0053] In this embodiment, the reflective portion 2213 is inclined at 45° relative to the optical axis X of the light recycling assembly 220, so that the non-image light L perpendicularly incident on the first surface 2211 is 21 The non-image light L may be incident on the reflective portion 2213 at an angle of 45° to the reflective portion 2213 and emitted from the first surface 2211 in a direction perpendicular to the first surface 2211 after being reflected by another reflective portion 2213. 21 The light can be recycled to the light output component 210 after total reflection at the two reflective portions 2213 , thereby effectively avoiding light waste and further improving light utilization.

[0054] The first surface 2211 and the second surface 2212 may both be rectangular, and the shape and size of the second surface 2212 are consistent with the shape and size of the imaging surface 231, so that the first polarized light L 41 The imaging surface 231 can be covered, so that the entire area of ​​the imaging surface 231 can be illuminated by the first polarized light L 41 While irradiating, avoid the first polarized light L 41 The light is projected outside the imaging surface 231, thereby reducing the efficiency of light utilization.

[0055] The shaper 221 further includes two oppositely disposed connecting portions 2214, which may be a plane or a serrated concave-convex surface. Each connecting portion 2214 is connected between the first surface 2211, the second surface 2212 and the two reflecting portions 2213. The connecting portion 2214 may be perpendicular to the first surface 2211 and the second surface 2212, respectively, that is, the connecting portion 2214 is parallel to the optical axis X of the light recycling component 220, so as to simplify the manufacturing process of the shaper 221.

[0056] In some embodiments, the connecting portion 2214 can also be tilted at a predetermined angle relative to the optical axis X of the light recycling component 220, so that each connecting portion 2214 can also be used to reflect the light in the C area to another connecting portion 2214, and reflect the light reflected by another connecting portion 2214 to the light output component 210, so as to realize the recycling of the light in the C area, thereby recycling all the non-image light L 21 , so as to further improve the light recycling efficiency of the projection device 200. As an example, the connection portion 2214 can be inclined at 45° relative to the optical axis X of the light recycling assembly 220.

[0057] In this embodiment, the connecting portion 2214 is an isosceles trapezoidal plane, the lower base of the isosceles trapezoidal plane is connected to the first surface 2211 , the upper base of the isosceles trapezoidal plane is connected to the second surface 2212 , and the waist of the isosceles trapezoidal plane is respectively connected to the two reflective portions 2213 .

[0058] In some embodiments, a quadrangular pyramid prism may be used as the shaper 221 , the upper bottom surface of the quadrangular pyramid prism is the second surface 2212 , the lower bottom surface is the first surface 2211 , and each side surface is two reflecting portions 2213 and two connecting portions 2214 .

[0059] In this embodiment, the polarizer assembly 222 includes two polarization beam splitter prisms 223 connected to each other. The two polarization beam splitter prisms 223 are connected as one body, which can prevent the two polarization beam splitter prisms 223 from being relatively located or misaligned when the temperature changes.

[0060] In some embodiments, the two polarization beam splitter prisms 223 may be bonded together by adhesive, and the adhesive may be an adhesive having a refractive index close to that of the material of the polarization beam splitter prism 223. Of course, adhesive may not be provided, and the two polarization beam splitter prisms 223 may be fixed by external force through the polarizer bracket to enhance light transmittance.

[0061] Each polarization beam splitter prism 223 includes a third surface 2221 and a fourth surface 2222 , and a polarization beam splitter film 2231 located between the third surface 2221 and the fourth surface 2222 . The two polarization beam splitter films 2231 are perpendicular to each other and are symmetrically arranged about the optical axis X of the light recycling component 220 .

[0062] Image light L 22 The polarization splitting film 2231 splits the light into the first polarized light L 41 and the second polarized light L 42 Each polarization splitting film 2231 is used to split the first polarized light L 41 is transmitted to the imaging surface 231, and is used to convert the second polarized light L 42 The second polarized light L reflected by the other polarization splitting film 2231 is reflected to the other polarization splitting film 2231. 42 The light is reflected to the light output component 210. The polarizer component 222 can realize light recovery and polarization at the same time through two polarization beam splitting prisms, uses fewer optical elements, and has a simple and practical structural design.

[0063] The polarization beam splitter prism 223 may include two right-angle prisms 224, the oblique surfaces of the two right-angle prisms 224 are glued to each other, and a polarization beam splitter film 2231 is provided on the oblique surface of one of the right-angle prisms 224. The third surface 2221 is a right-angle side surface of one of the right-angle prisms 224 facing the shaper 221, and the fourth surface 2222 is a right-angle side surface of the other right-angle prism 224 away from the shaper 221.

[0064] In this embodiment, the light valve 230 is suitable for modulating P polarized light, and the polarization splitter film 2231 can be a dielectric film with the function of transmitting P polarized light and reflecting S polarized light, so that the P polarized light can pass completely, and the S polarized light can be incident on the light output component 210 after total reflection between the two polarization splitter films 2231, effectively avoiding the waste of light and further improving the utilization rate of light.

[0065] Figure 5 is another structural schematic diagram of the projection device provided in the embodiment of the present application, combined with Figure 2 and Figure 5 As shown, in this embodiment, the light output component 210 includes a laser module 211 and a color wheel 212. The laser module 211 is used to emit an excitation light L0. The color wheel 212 is arranged on the light output path of the laser module 211, and is used to receive the excitation light L0 and generate the illumination light L1, and is used to diffusely reflect the recycled light recovered to the color wheel 212. The diffusely reflected recycled light can be incident on the light recycling component 220 for reuse.

[0066] The diffuse reflection effect of the color wheel 212 can convert the second polarized light L 42 The natural light is converted into non-polarized natural light. After the non-polarized natural light passes through the collecting lens group 250, the large-angle light is irradiated to the shaper 221, and the small-angle light is transmitted through the shaper 221 to the polarizer component 222 for splitting to form the first polarized light that is incident on the imaging surface 231, so that it can be reused.

[0067] The color wheel 212 can be a rotating color wheel, a belt-shaped barrel wheel, or a periodic translation plate. As long as the device can excite fluorescence and reflect the recycled light back into the optical path, it belongs to the scope of protection of the present application.

[0068] The laser module 211 may include three laser generators 2111 arranged in an array in sequence, and each laser generator 2111 is used to emit blue excitation light L0.

[0069] The light output component 210 may also include a light homogenizer 213 and a positive lens 214. The number of the light homogenizer 213 and the positive lens 214 is consistent with the number of the laser generators 2111. The excitation light L0 emitted by each laser generator 2111 is shaped by the light homogenizer 213 and then incident on the positive lens 214, and then imaged on the color wheel 212 by the positive lens 214. The positive lens 214 can converge the excitation light L0 to reduce the divergence angle of the excitation light L0.

[0070] The color wheel 212 can be a transmissive color wheel, and the color wheel 212 can include a transparent substrate 2121, a scattering plate 2122 and a polarizing plate 2123. The transparent substrate 2121 includes a substrate light incident surface 2127 and a substrate light emitting surface 2128 opposite to each other. The substrate light incident surface 2127 faces the laser module 211, the scattering plate 2122 is arranged on the substrate light incident surface 2127, and the polarizing plate 2123 is arranged on the substrate light emitting surface 2128. The excitation light L0 is transmitted through the scattering plate 2122 and the polarizing plate 2123 in turn to form the illumination light L1. The polarizing plate 2123 is also used to split the recycled light recovered to the polarizing plate 2123 and then partially reflect it to the light recycling component 220.

[0071] Specifically, the scattering plate 2122 is used to scatter the incident excitation light L0. The excitation light L0 can form a divergent outgoing light through the scattering plate 2122, and has the effect of eliminating laser speckle. The polarizer 2123 can be a polarization beam splitter with the function of transmitting P polarized light and reflecting S polarized light. When the recycled light is recycled to the polarizer 2123, it will split to produce P polarized light and S polarized light. At the same time, the S polarized light can be reflected by the polarizer 2123 to the light recycling component 220 for reuse, and the P polarized light will pass through the polarizer 2123 to form useless light. The polarizer 2123 is used to recycle S polarized light to avoid the waste caused by the formation of useless light by the S polarized light and the P polarized light passing through the scattering plate 2122 at the same time, so as to realize as much light circulation as possible and further improve the utilization efficiency of light.

[0072] The color wheel 212 may further include a phosphor layer 2124, which is disposed on the transparent substrate 2121. The excitation light L0 passes through the phosphor layer 2124 to generate fluorescence as the illumination light L1. The phosphor layer 2124 has a rough surface, and the phosphor layer 2124 is also used to diffusely reflect the recycled light recovered to the phosphor layer 2124 and then re-incend it into the light recycling component 220, thereby realizing the reuse of light.

[0073] The phosphor layer 2124 may include a red phosphor layer 2125 and a green phosphor layer 2126. The red phosphor layer 2125, the green phosphor layer 2126 and the scattering plate 2122 (or the polarizing plate 2123) are concentrically arranged and correspond to one laser generator 2111 respectively. The blue excitation light L0 emitted by one of the laser generators 2111 excites and generates red illumination light L1 through the red phosphor layer 2125, the blue excitation light L0 emitted by another laser generator 2111 excites and generates green illumination light L1 through the green phosphor layer 2126, and the blue excitation light L0 emitted by the remaining laser generator 2111 sequentially passes through the scattering plate 2122 and the polarizing plate 2123 to generate blue illumination light L1. Thus, the light output component 210 can generate three different colors of illumination light separated from each other in space.

[0074] The projection device 200 may further include a collecting lens group 250, which is disposed on the optical path between the light emitting component 210 and the light recycling component 220, and is used to collect the illumination light L1 emitted by the light emitting component 210 to the light recycling component 220, and to collect the recycled light reflected by the light recycling component 220 to the color wheel 212. The collecting lens group 250 is used to reduce the divergence angle of the light beam to achieve the convergence of the light beam.

[0075] The collecting lens group 250 may include two elliptical collecting lenses, one of which is close to the light recycling component 220 and the other is close to the light output component 210, so as to achieve a better light collecting effect.

[0076] The three-color light beams generated by the light emitting component 210 are incident on the light recycling component 220 after passing through the collecting lens group 250. The three-color light beams are superimposed on each other on the incident surface of the light recycling component 220. The three-color light beams are separated from each other in angular space, and the spatial solid angles do not overlap with each other. However, in the surface space, since the propagation distance is not far enough, the three-color light beams will be superimposed on each other in the near field to form white light.

[0077] In this embodiment, the non-image light L 21 The image light L is a large-angle light in the light beam emitted from the color wheel 212 to the light recycling assembly 220. 22 It is a small angle light in the light beam emitted from the color wheel 212 to the light recycling component 220. Among them, the angle between the large angle light and the optical axis X of the light recycling component 220 can be greater than the set angle α, and the angle between the small angle light and the optical axis X of the light recycling component 220 can be less than the set angle α. In the case where the collecting lens group 250 is not set, it is assumed that the red phosphor layer 2125 is located at the innermost side of the color wheel 212, the first endpoint is set to be located on the side of the red phosphor layer 2125 close to the center of the color wheel 212, and the second endpoint is located at the connection between the reflective part 2213 and the polarizer component 222. The set angle α can be roughly equal to the angle value between the line between the first endpoint and the second endpoint and the optical axis X of the light recycling component 220, so as to ensure that the light with the maximum angle can be completely recycled and reused, and further improve the light utilization efficiency.

[0078] Figure 6 yes Figure 5 The optical path diagram of the projection device provided in the embodiment shown is shown in FIG. Figure 2 , Figure 5 and Figure 6 As shown, the non-image light L 21After two total reflections in the shaper 221, the light returns to the collection lens group 250 and is imaged on the respective light-emitting surfaces. Specifically, the red light returns to the red phosphor layer 2125, is diffusely reflected and emitted, and is reused by the light recycling component 220. The green light returns to the green phosphor layer 2126, is diffusely reflected and emitted, and is reused by the light recycling component 220. The blue light returns to the polarizer 2123 and is split into P polarized light and S polarized light. The S polarized light is reflected to the collection lens group 250 and is reused by the light recycling component 220. The P polarized light passes through the polarizer 2123 and forms useless light.

[0079] The shaped light L3 entering the polarizer assembly 222 is split into the first polarized light L 41 (e.g. P polarized light) and the second polarized light L 42 (e.g. S polarized light), the second polarized light L 42 After two reflections, the light returns to the collection lens group 250, and then returns to the respective light-emitting areas on the color wheel 212, and then is emitted through diffuse reflection of the red phosphor layer 2125 and the green phosphor layer 2126, forming natural light that can be reused, thus realizing light circulation. In addition, the light beam reflected to the polarizer 2123 is split and then emitted, and the S-polarized light therein can be reused.

[0080] The projection device 200 may further include a microlens array, which is disposed on the display surface of the light valve 230. The microlens array may include a plurality of microlenses, each of which covers at least two pixels on the light valve 230. The incident light of three colors separated from each other in angular space will undergo surface angle conversion after passing through the microlens array, that is, after passing through the microlens array, the light separated in angular space will be separated in surface space, so that light beams of different colors will illuminate corresponding liquid crystal pixels to avoid TFT wires in the light valve 230, thereby effectively reducing the light efficiency loss caused by the TFT wires, improving the light utilization efficiency, increasing the maximum output brightness, and reducing the heat on the light valve 230, thereby improving the reliability of the light valve 230.

[0081] Figure 7 is a schematic diagram of the structure of a projection device provided by another embodiment of the present application, see Figure 2 and Figure 7As shown, in this embodiment, the color wheel 212 can be a reflective color wheel, and the color wheel 212 can include a reflective substrate 2171, a phosphor layer 2172 and a scattering sheet 2173. The reflective substrate 2171 includes a substrate reflective surface 2176, and the phosphor layer 2172 and the scattering sheet 2173 are arranged on the substrate reflective surface 2176. The excitation light L0 is incident on the phosphor layer 2172 and excites to generate fluorescence as the illumination light L1. The phosphor layer 2172 is also used to diffusely reflect the light beam recovered to the phosphor layer 2172, so that the light beam can be re-incident to the light recycling component 220 to achieve light circulation. The excitation light L0 is also incident on the scattering sheet 2173 and reflected to form the illumination light L1. The scattering sheet 2173 is also used to diffusely reflect the recycled light recovered to the scattering sheet 2173, so that the light beam can be re-incident to the light recycling component 220 to achieve light circulation.

[0082] The substrate reflective surface 2176 can be coated with a material having diffuse reflection properties. The phosphor layer 2172 and the scattering plate 2173 are arranged on the substrate reflective surface 2176. The phosphor layer 2172 can include a red phosphor layer 2174 and a green phosphor layer 2175. The red phosphor layer 2174, the green phosphor layer 2175 and the scattering plate 2173 are concentrically arranged.

[0083] In this embodiment, the collecting lens group 250 is disposed on the optical path between the color wheel 212 and the light recycling assembly 220 for collecting the illumination light to the light recycling assembly 220 and for collecting the light beam reflected by the light recycling assembly 220 to the color wheel 212 .

[0084] The laser module 211 may be a laser generator for emitting blue excitation light L0.

[0085] In this embodiment, the light output component 210 may also include a light homogenizer 215 and a reflector 216, which are arranged in sequence on the light output path of the laser module 211. The blue excitation light L0 emitted by the laser module 211 is incident on the light homogenizer 215 and is shaped into three beams of blue excitation light L0 with different output directions, which are then reflected by the reflector 216 to the collecting lens group 250 and then imaged on the color wheel 212.

[0086] The light homogenizing device 215 may be a fly-eye lens, which is formed by combining a series of small lenses and can achieve high light energy utilization and uniform illumination over a large area.

[0087] The reflector 216 may be a polarized coated glass sheet, and the reflector 216 is located outside the light path between the collecting lens group 250 and the light recycling component 220 to prevent blocking the transmission path of the illumination light.

[0088] In some embodiments, the laser module 211 may also include three laser generators, and the three laser generators are used to generate three blue laser beams with different emission directions.

[0089] In this embodiment, three blue laser beams with different emission directions are imaged on the red phosphor layer 2174, the green phosphor layer 2175 and the scattering plate 2173 respectively after passing through the collecting lens group 250, wherein one blue laser beam excites the red phosphor layer 2174 to generate red illumination light, another blue laser beam excites the green phosphor layer 2175 to generate green illumination light, and the remaining blue laser beam is reflected by the scattering plate 2173 to generate blue illumination light. Thus, the light emitting assembly 210 can generate three different colors of illumination light separated from each other in space.

[0090] The three colors of illumination light generated by the light emitting component 210 pass through the collecting lens group 250 and are incident on the light recycling component 220. The three colors of light beams are superimposed on the incident surface of the light recycling component 220. The three colors of light beams are separated from each other in angular space, and the spatial solid angles do not overlap with each other. However, in the surface space, since the propagation distance is not far enough, the three colors of light beams will be superimposed on each other in the near field to form white light.

[0091] Figure 8 yes Figure 7 The optical path diagram of the projection device provided in the embodiment shown in the figure is combined with Figure 7 and Figure 8 As shown, the non-image light returns to the collection lens group 250 after two total reflections in the shaper 221, and then forms an image on the respective light-emitting surfaces. Specifically, the red light returns to the red phosphor layer 2174, then diffusely reflects and is reused by the light recycling component 220. The green light returns to the green phosphor layer 2175, then diffusely reflects and is reused by the light recycling component 220. The blue light returns to the scattering sheet 2173, then diffusely reflects and is reused by the light recycling component 220.

[0092] The shaped light entering the polarizer assembly 222 is split into a first polarized light (e.g., P polarized light) and a second polarized light (e.g., S polarized light). The second polarized light is reflected twice and then incident on the collecting lens group 250, and then incident on the respective light-emitting areas on the color wheel 212, and then emitted through diffuse reflection to form natural light that can be reused, thereby realizing light circulation.

[0093] It can be understood that the light recycling component provided in the embodiment of the present application, because it has both a shaper and a light deflection component, can achieve beam shaping and recycling through only one component, reducing the volume of the entire optical path design, reducing costs, and improving light utilization efficiency. It can be flexibly applied to various projection, lighting and other display scenes; at the same time, in the projection system provided in the embodiment of the present application, the illumination light is shaped and split by the light recycling component to form a first polarized light emitted to the imaging surface. Since the spot shape of the first polarized light is adapted to the shape of the imaging surface, all areas of the imaging surface can be illuminated by the light beam, and the light beam finally incident on the imaging surface is a light beam with a specific polarization direction, which can effectively avoid color crosstalk problems. The light recycling component is also used to guide the remaining illumination light to the light emitting component to form recycled light. After being reflected by the light emitting component, the recycled light can be re-incident to the light recycling component to achieve light circulation, effectively improving the light utilization efficiency.

[0094] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A light recycling component, characterized in that: It includes a shaper and a polarizer assembly, wherein: The shaper is used to shape the illumination light input to the light recycling component to form non-image light and image light with a preset spot shape, the image light is irradiated to the polarizer component, and the non-image light is recycled by the shaper; The polarizer component is used to split the image light into a first polarized light and a second polarized light having a polarization state different from that of the first polarized light, the first polarized light is used for optical modulation, and the second polarized light is recovered by the polarizer component; The non-image light and the second polarized light together constitute recycled light.

2. The light recycling assembly according to claim 1, characterized in that , the shaper is integrated with the polarizer assembly.

3. The light recycling assembly according to claim 1, characterized in that: The shaper includes a first surface and a second surface opposite to each other, the illumination light is incident from the first surface, and the image light is emitted from the second surface; the polarizer assembly includes a third surface and a fourth surface, the image light is incident from the third surface, and the first polarized light is emitted from the fourth surface; the third surface abuts against the second surface.

4. The light recycling assembly according to claim 3, characterized in that: The shaper also includes two symmetrically arranged reflecting parts, each of which is arranged and connected between the first surface and the second surface, and each of which is used to reflect the non-image light to another reflecting part and recycle the non-image light reflected by another reflecting part.

5. The light recycling assembly according to claim 3, characterized in that: The shape of the second surface of the shaping device is a preset shape, and the illumination light is shaped to form the image light.

6. The light recycling assembly according to claim 3, characterized in that: The polarizer assembly includes two interconnected polarization beam splitter prisms, each of the polarization beam splitter prisms includes the third surface and the fourth surface, and a polarization beam splitter film located between the third surface and the fourth surface, and the two polarization beam splitter films are perpendicular to each other and symmetrically arranged with each other; each polarization beam splitter film is used to transmit the first polarized light, and to reflect the second polarized light to another polarization beam splitter film, and to recover the second polarized light reflected by the other polarization beam splitter film.

7. A projection device, characterized in that: It comprises a light emitting component, a light valve and a light recycling component according to any one of claims 1 to 6, wherein the light recycling component and the light valve are sequentially arranged on the light emitting path of the light emitting component, wherein: The light emitting component is used to emit the illumination light and reflect the recycled light to the light recycling component; The light valve includes an imaging surface for modulating light irradiated onto the imaging surface; The light recycling component guides the first polarized light to the imaging surface, and guides the recycled light to the light output component, wherein a preset spot shape of the first polarized light is adapted to a shape of the imaging surface.

8. The projection device according to claim 7, characterized in that: The light output component comprises: A laser module, used for emitting excitation light; The color wheel is arranged on the light output path of the laser module, and is used to receive the excitation light and generate the illumination light, and is used to diffusely reflect the recycled light recycled to the color wheel.

9. The projection device according to claim 8, characterized in that: The color wheel includes a transparent substrate, a scattering plate and a polarizing plate. The transparent substrate includes a substrate light incident surface and a substrate light emitting surface opposite to each other. The scattering plate is arranged on the substrate light incident surface, and the polarizing plate is arranged on the substrate light emitting surface. The excitation light passes through the scattering plate and the polarizing plate in sequence to form the illumination light. The polarizing plate is also used to split the recycled light recovered to the polarizing plate and then partially reflect it to the light recycling component.

10. The projection device according to claim 8, characterized in that: The color wheel includes a reflective substrate, a phosphor layer and a scattering sheet, the reflective substrate includes a substrate reflective surface, the phosphor layer and the scattering sheet are arranged on the substrate reflective surface, the excitation light is incident on the phosphor layer and excites to generate fluorescence as the illumination light, and the phosphor layer is also used to diffusely reflect the recycled light recovered to the phosphor layer; the excitation light is incident on the scattering sheet and reflected to form the illumination light, and the scattering sheet is also used to diffusely reflect the recycled light recovered to the scattering sheet.

11. The projection device according to claim 8, characterized in that: The projection device further comprises a collecting lens group, which is arranged on the light path between the color wheel and the light recycling component and is used for collecting the illumination light to the light recycling component and for collecting the recycled light to the color wheel.

12. The projection device according to claim 7, characterized in that: The projection device further comprises a microlens array, and the microlens array is arranged on the imaging surface.

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