CN114077135A

CN114077135A - Light recovery assembly and projection device

Info

Publication number: CN114077135A
Application number: CN202010841943.2A
Authority: CN
Inventors: 方元戎; 郭祖强; 蒲栋; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2022-02-22
Also published as: WO2022037416A1

Abstract

The embodiment of the application provides a light recycling assembly and a projection device, wherein the light recycling assembly comprises a shaper and a polarizer assembly, the shaper is used for shaping illuminating light into image light and non-image light with a preset light spot shape, the image light is irradiated to the polarizer assembly, and the non-image light is recycled by the shaper; the polarizer component splits the image light into first polarized light and second polarized light different from the polarization state of the first polarized light, the first polarized light is used for optical modulation, the second polarized light is recycled by the polarizer component, and the non-image light and the second polarized light jointly form recycled light. The projection system further comprises a light emitting assembly, a light valve and a light recycling assembly, the light emitting assembly is used for emitting illumination light and reflecting the recycled light to the light recycling assembly, the light valve comprises an image display surface, and the shape of the preset light spot of the first polarized light is matched with the shape of the image display surface. The light recycling assembly and the projection system can shape and recycle illumination light, realize light circulation and effectively improve light utilization efficiency.

Description

Light recovery assembly and projection device

Technical Field

The application relates to the technical field of optical instruments, in particular to a light recovery assembly and a projection device.

Background

The conventional LCD (Liquid Crystal Display) projector is very similar to the conventional film projector and slide projector, i.e. at the position of the original film or slide, the LCD Liquid Crystal panel is used as an image Display source, the high-power Light is projected through a high-power bulb or LED (Light Emitting Diode) at the back, then the Light is shaped, imaged and corrected in a trapezoidal manner, and finally the image on the LCD Liquid Crystal panel is projected on a white screen or a white wall in an enlarged manner through a lens of the projector, so that a user obtains images of dozens to hundreds of inches, and the effect and experience of watching the film can be obtained.

However, the conventional LCD projection has problems of large volume, many optical elements, low efficiency, and the like. As shown in fig. 1, when the conventional LCD liquid crystal panel 100 is used, in order to improve the transmittance of the panel, the illumination light is generally polarized by a brightness enhancement film in advance, so that the light loss caused by the first polarizer 110 can be effectively reduced, 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. LCD projection suffers from low efficiency in use, mainly for several reasons:

1. the current consumer demands for projectors are mainly portability (small size) and high resolution, and higher demands are made on LCD liquid crystal panels. However, the conventional mainstream processing technology can only realize the wire size of a TFT (Thin Film Transistor) with a length of 12 micrometers and a width of 3.5 micrometers, and the wire size of the TFT cannot be reduced due to the reduction of pixels, so that the aperture ratio (the ratio of an effective region through which light can pass) of the conventional LCD liquid crystal panel is generally below 50%, which affects the light efficiency;

2. in order to prevent crosstalk of pixels with different colors and protect the transparent electrodes and the TFT wires, an upper layer of black film 120 and a lower layer of black film 120 are arranged on the LCD panel, which also brings loss of light efficiency;

3. in the existing LCD liquid crystal panel, a large pixel is divided into three RGB small pixels by a color film and a black film on the large pixel, so as to realize full-color display. However, since the backlight source is white light, the color film can only transmit light of a specific color (spectrum), and the rest of light cannot be utilized by a subsequent optical system, which finally causes about 66% energy efficiency loss and low utilization rate.

The single DLP (Digital Light Processing) and LCOS (Liquid Crystal on Silicon) display technologies can realize full-color display without reducing Light efficiency, and specifically, the technology outputs RGB three-color illumination Light in time series (within one frame) by a Light source, and a spatial Light modulator modulates Light of a specific color in time series to realize full-color display of one frame of a screen. However, this method causes the color image edge to have RGB color misalignment, also called the color break up (color break up). The rainbow effect is caused because the RGB sub-frame images displayed in time series in one image frame cannot be overlapped in the imaging position on the retina of human eyes, and is more obvious for the color image moving on the screen, and may bring dazzling feeling to the viewers, and still needs to be improved.

Disclosure of Invention

An object of the present application is to provide a light recycling assembly and a projection apparatus, so as to solve the above problems. The embodiment of the application realizes the aim through the following technical scheme.

Embodiments of the present application provide a light recycling assembly comprising a shaper and a polarizer assembly, wherein,

the shaper is used for shaping the illumination light input into the light recovery component to form non-image light and image light with a preset light spot shape, the image light is irradiated to the polarizer component, and the non-image light is recovered by the shaper; the polarizer component is used for splitting the image light into first polarized light and 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 recycled light.

In one embodiment, the shaper is integrally disposed with the polarizer assembly.

In one embodiment, the shaper includes opposing first and second surfaces, 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 from which the image light is incident and a fourth surface from which the first polarized light exits; the third surface abuts against the second surface.

In one embodiment, the shaper further comprises two symmetrically disposed reflective portions, each of the reflective portions disposed between and coupled to the first surface and the second surface, each of the reflective portions configured to reflect the non-image light to the other of the reflective portions and to recycle the non-image light reflected by the other of the reflective portions.

In one embodiment, the second surface of the shaping device has a predetermined shape, and the illumination light is shaped to form the image light.

In one embodiment, the polarizer assembly comprises two interconnected polarization splitting prisms, each of the polarization splitting prisms comprising the third surface and the fourth surface, and a polarization splitting film located between the third surface and the fourth surface, the two polarization splitting films being perpendicular to each other and symmetrically disposed with respect to each other; each of the polarization splitting films is configured to transmit the first polarized light, and to reflect the second polarized light to the other polarization splitting film and to recover the second polarized light reflected by the other polarization splitting film.

The embodiment of the application also provides a projection system, which comprises a light-emitting component, a light valve and the light recovery component, wherein the light recovery component and the light valve are sequentially arranged on a light-emitting path of the light-emitting component; the light emitting assembly is used for emitting the illuminating light and reflecting the recycled light to the light recycling assembly; the light valve comprises an image display surface and is used for modulating light irradiated on the image display surface; the light recovery assembly guides the first polarized light to the image display surface and guides the recovered light to the light outlet assembly, wherein the shape of the preset light spot of the first polarized light is matched with the shape of the image display surface.

In one embodiment, the light emitting assembly comprises a laser module and a color wheel, wherein the laser module is used for emitting exciting light; the color wheel is arranged on the light emitting path of the laser module and used for receiving exciting light and generating illuminating light and performing diffuse reflection on recovered light recovered to the color wheel.

In one embodiment, the color wheel includes a transparent substrate, a scattering sheet and a polarizing sheet, the transparent substrate includes a substrate light incident surface and a substrate light emergent surface which are opposite to each other, the scattering sheet is disposed on the substrate light incident surface, the polarizing sheet is disposed on the substrate light emergent surface, the exciting light sequentially penetrates through the scattering sheet and the polarizing sheet to form the illuminating light, and the polarizing sheet is further used for splitting the recycled light recycled to the polarizing sheet and then partially reflecting the split light to the light recycling assembly.

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 disposed on the substrate reflective surface, excitation light is incident to the phosphor layer and excited to generate fluorescence as illumination light, and the phosphor layer is further configured to diffuse the recovered light recovered to the phosphor layer; the exciting light is incident to the scattering sheet and reflected to form illuminating light, and the scattering sheet is also used for performing diffuse reflection on the recovered light recovered to the scattering sheet.

In one embodiment, the projection display device further includes a collection lens set disposed on the light path between the color wheel and the light recycling assembly for collecting the illumination light to the light recycling assembly and for collecting the recycled light to the color wheel.

In one embodiment, the projection apparatus further includes a microlens array disposed on the image display surface.

Compared with the prior art, the light recovery assembly provided by the embodiment of the application is provided with the shaper and the light deflection assembly at the same time, so that the shaping and recovery of light beams can be realized through only one assembly, the volume of the whole light path design is reduced, the cost is reduced, the light utilization efficiency is improved, and the light recovery assembly can be flexibly applied to various display scenes such as projection, illumination and the like; meanwhile, in the projection system provided by the embodiment of the application, the light recovery assembly reshapes and splits the illumination light to form the first polarized light which is emitted to the image display surface, and because the shape of the light spot of the first polarized light is matched with that of the image display surface, all areas of the image display surface can be illuminated by the light beam, and the light beam which is finally incident to the image display surface is the light beam with a specific polarization direction, so that the color crosstalk problem can be effectively avoided. The light recycling assembly is also used for guiding the rest of the illuminating light to the light emitting assembly to form recycled light, the recycled light can be incident to the light recycling assembly again after being reflected by the light emitting assembly to realize light circulation, and the utilization efficiency of the light is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of an LCD liquid crystal panel in the related art.

Fig. 2 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Fig. 3 is a schematic projection diagram of a light beam on a shaper provided in an embodiment of the present application.

Fig. 4 is an exploded view of a light recovery assembly provided in an embodiment of the present application.

Fig. 5 is another schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Fig. 6 is an optical path diagram of a projection apparatus provided in the embodiment shown in fig. 5.

Fig. 7 is a schematic structural diagram of a projection apparatus according to another embodiment of the present application.

Fig. 8 is an optical path diagram of a projection apparatus provided in the embodiment shown in fig. 7.

Detailed Description

To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the examples of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It should be noted that the light recycling assembly provided in the embodiments of the present application can be used independently without any support for the projection apparatus, and the following detailed description is only provided for the purpose of enabling those skilled in the art to more clearly understand the present application from the practical application in the projection apparatus.

Fig. 2 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application, please refer to fig. 2, in which a projection apparatus 200 includes a light-emitting device 210, a light-recycling device 220, and a light valve 230, and the light-recycling device 220 and the light valve 230 are sequentially disposed on a light-emitting path of the light-emitting device 210. The light valve 230 includes an image plane 231, and the image plane 231 is used for modulating light incident on the image plane 231 to form an optical image. The light-emitting component 210 is used for emitting illumination light L₁The light recycling assembly 220 is used for providing the illumination light L₁Shaping and splitting the light to form first polarized light L emitted to the image display surface 231₄₁And guiding the rest of the illuminating light to the light-emitting component 210 to form the recycled light L₃Light of the first polarization L₄₁The spot shape of (a) is adapted to the shape of the image-display surface 231. The light-emitting component 210 is also used for collecting the recycled light L₃Reflected to the light recovery assembly 220.

The light valve 230, also called a liquid crystal light valve, is a key device for modulating the illumination light emitted from the light recycling assembly 220, and usually, the light valve 230 utilizes a specific polarization directionThe beam of light directed. In this embodiment, the image display surface 231 is used for modulating the first polarized light L₄₁. The projection device 200 may further include a lens 240, and the light beam modulated and output by the image display surface 231 may be projected onto the screen to form a projection image after being imaged by the lens 240.

Fig. 3 is a schematic projection diagram of a light beam on a shaper provided in an embodiment of the present disclosure, and referring to fig. 2 and 3, an image display surface 231 is generally rectangular, and when the light exit component 210 is a fluorescence light source, since the fluorescence light emission characteristic is lambertian light emission, a cross-sectional shape of a light spot is generally circular or approximately circular. If the entire image plane 231 is covered by the circular light beam, the light beam at the edge of the light beam is projected to the area outside the image plane 231, and the light beam cannot enter the image plane 231, which causes waste of the light beam and results in low utilization efficiency of the light beam. If the cross-sectional area of the light beam is reduced and all the circular light beam is transmitted into the image plane 231, a partial area of the image plane 231 cannot be illuminated by the light beam, so that the partial area cannot be imaged, and the modulation function of the image plane cannot be realized to the maximum.

The projection apparatus 200 uses the light recycling assembly 220 to illuminate the illumination light L₁Shaping and splitting the light to form first polarized light L emitted to the image display surface 231₄₁Due to the first polarized light L₄₁The shape of the light spot is matched with the shape of the image plane 231, so that all areas of the image plane 231 can be illuminated by the light beam, and the light beam finally incident on the image plane 231 is the light beam with a specific polarization direction, and the problem of color crosstalk can be effectively avoided. The light recycling assembly 220 is also used for guiding the rest of the illuminating light to the light-emitting assembly 210 to form recycled light L₃Light L is recovered₃After being reflected by the light emitting component 210, the light can be incident to the light recycling component 220 again, so that light circulation is realized, and the utilization efficiency of light is effectively improved. Meanwhile, only one light recovery component is arranged, so that the shaping and recovery of the light beam are realized, the volume of the whole light path design is reduced, and the cost is reduced.

The light recycling assembly 220 may include a shaper 221 and a polarizer assembly 222, wherein the shaper 221 is configured to shape the illumination light input to the light recycling assembly 220 to form non-image light and image light having a predetermined spot shape, the image light is irradiated to the polarizer assembly 222, the non-image light is recycled by the shaper 221, the polarizer assembly 222 is configured to split the image light into first polarized light and 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 recycled by the polarizer assembly 222, and the non-image light and the second polarized light together form recycled light.

Specifically, the shaper 221 is used for shaping the illumination light L₁Shaped into image light L emitted to the image plane 231₂₂And non-image light L emitted outside the image plane 231₂₁And at least part of the non-image light L₂₂Guided to the light-emitting component 210 as the recycled light L₃. The polarizer assembly 222 is disposed on the light-exiting path of the shaper 221 for reflecting the image light L₂₂Is divided into first polarized light L₄₁And with the first polarized light L₄₁The second polarized light L with different polarization states₄₂And the first polarized light L is transmitted₄₁Transmits the second polarized light L to the image display surface 231₄₂Guided to the light-emitting component 210 as the recycled light L₃。

It should be noted that fig. 2 only shows the light transmission diagram of the upper half of the optical axis X of the light recycling assembly 220, and the symmetrical parts are the same.

In this embodiment, the light beam emitted from the light-emitting device 210 to the light-recycling device 220 includes the illumination light L emitted from the light-emitting device 210₁And recycled light reflected by the light recycling assembly 220. Non-image light L₂₁The image light L is a large-angle light of the light beams emitted from the light-emitting component 210 to the light-recycling component 220₂₂The light rays with small angles in the light beam emitted from the light-emitting component 210 to the light-recycling component 220. The included angle between the large-angle light and the optical axis X of the light recycling assembly 220 may be greater than a set included angle, and the included angle between the small-angle light and the optical axis X of the light recycling assembly 220 may be smaller than the set included angle.

In the present embodiment, the non-image light L₂₁Including the A-zone light and the C-zone light, the shaper 221 can be used only to guide the A-zone light to the light-exiting component 210, i.e. to project the A-zone light to the length of the image plane 231Non-image light L to both sides₂₁Is guided to the light-emitting component 210 to make the non-image light L which cannot be projected to the image display surface 231₂₁The light emitting component 210 can be recycled, and the light is reflected by the light emitting component 210 and then returns to the light recycling component 220, so that light recycling is realized, and the light efficiency can be improved.

In some embodiments, the shaper 221 can also be used to direct the area a and area C light rays to the light exit component 210, i.e., to direct all of the non-image light L₂₁To the light exit element 210. Of course, the shaper 221 may be used to guide the C-region light to the light-emitting assembly 210 only, i.e. the non-image light L projected to the two sides of the image display surface 231 in the width direction₂₁To the light exit element 210.

Image light L₂₂For B-zone light, the shaper 221 transmits the image light L₂₂Splitting the light to polarizer assembly 222 to form first polarized light L₄₁And light of the second polarization L₄₂Light of the first polarization L₄₁The image plane 231 is completely covered so that all areas on the image plane 231 can be visualized.

When the shape of the image display surface 231 is a predetermined shape, the light-emitting surface (i.e., a second surface) of the shaper 221 is set to be the predetermined shape, so that the shaped first polarized light L is obtained₄₁The preset light spot shape is a preset shape; when the shape of the image display surface 231 is a triangle or a trapezoid or other preset shapes, the light-emitting surface of the shaper 221 is arranged so that the shaped first polarized light L is₄₁The predetermined spot shape is a corresponding triangle, trapezoid or other predetermined shapes, and those skilled in the art can adaptively adjust the light emitting surface of the shaper 221 according to the actual structure of the light valve 230, so as to shape the first polarized light L₄₁The preset spot shape meets the requirements.

First polarized light L₄₁The light may be P-polarized light or S-polarized light. When the first polarized light L₄₁When P polarized light is emitted, the second polarized light L₄₂Is S polarized light. When the first polarized light L₄₁When the polarized light is S polarized light, the second polarized light L₄₂P polarized light. In this embodiment, the light valve 230 is adapted to modulate P-polarizationLight, first polarized light L₄₁Is P polarized light, and second polarized light L₄₂Is S polarized light.

In this embodiment, the shaper 221 includes a first surface 2211 and a second surface 2212, and the illumination light L₁Incident image light L from first surface 2211₂₂And exits second surface 2212. Polarizer assembly 222 includes a third surface 2221 and a fourth surface 2222, image light L₂₂Incident from the third surface 2221, the first polarized light L₄₁And exits from the fourth surface 2222, and the third surface 2221 abuts against the second surface 2212. Therefore, the shaper 221 and the polarizer assembly 222 are connected into a whole, the space occupied by the light recovery assembly 220 is reduced, the processing and the manufacturing are convenient, and meanwhile, the relative displacement or dislocation between the shaper 221 and the polarizer assembly 222 can be avoided when the temperature changes.

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 of the image light L exiting from the second surface 2212₂₂The light energy utilization rate is highest.

In some embodiments, third surface 2221 is adhered to second surface 2212 by an adhesive, which may be an adhesive having a refractive index close to that of the materials of shaper 221 and polarizer assembly 222. Of course, instead of providing adhesive, the light recycling assembly support may be used to fix the shaper 221 and the polarizer assembly 222 by an external force to enhance the light transmittance.

Fig. 4 is an exploded view of the light recycling assembly according to the embodiment of the present application, and as shown in fig. 2 and 4, the shaper 221 further includes two reflective portions 2213 symmetrical with respect to the optical axis X of the light recycling assembly 220, each reflective portion 2213 is disposed and connected between the first surface 2211 and the second surface 2212, and each reflective portion 2213 is used for reflecting the non-image light L₂₁Reflects the non-image light L reflected by the other reflecting portion 2213₂₁And is reflected to the light-emitting assembly 210. Thereby, the non-image light L can be realized₂₁And (4) recycling.

The reflecting portion 2213 may be a plane or a concave-convex surface with serrations as long as it can reflect light. The reflective portion 2213 may also be coated with a reflection enhancing film to enhance the light reflection effect of the reflective portion 2213 and reduce the light energy loss during reflection.

In this embodiment, the reflecting portion 2213 is inclined by 45 ° with respect to the optical axis X of the light recycling assembly 210, so that the non-image light L perpendicularly incident on the first surface 2211₂₁The non-image light L may enter the reflecting portion 2213 at 45 ° with respect to the reflecting portion 2213, be reflected by another reflecting portion 2213, and then exit from the first surface 2211 in a direction perpendicular to the first surface 2211₂₁The light can be recycled to the light emitting assembly 210 after the two reflecting portions 2213 are totally reflected, so that the waste of light is effectively avoided, and the utilization rate of light is further improved.

The first surface 2211 and the second surface 2212 may be both rectangular, and the shape and size of the second surface 2212 are consistent with the shape and size of the image display surface 231, so that the first polarized light L is emitted₄₁Can cover the image display surface 231 and make the whole area of the image display surface 231 be able to be received by the first polarized light L₄₁While irradiating, the first polarized light L is avoided₄₁The light is projected to the outside of the image display surface 231, and the use efficiency of the light is reduced.

The shaper 221 further includes two connecting portions 2214 disposed opposite to each other, and the connecting portions 2214 may be flat or serrated concave-convex surfaces. Each connecting portion 2214 is connected between the first surface 2211, the second surface 2212 and 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 assembly 220, so as to simplify the manufacturing process of the shaper 221.

In some embodiments, the connecting portions 2214 may also be inclined by a predetermined angle with respect to the optical axis X of the light recycling assembly 220, so that each connecting portion 2214 can also be used to reflect the light in the C region to another connecting portion 2214 and reflect the light reflected by another connecting portion 2214 to the light emitting assembly 210, thereby recycling the light in the C region, and thus all the non-image light L can be recycled₂₁To further improve the light recycling efficiency of the projection apparatus 200. As an example, the connection portion 2214 may be inclined by 45 ° with respect to the optical axis X of the light recycling assembly 220.

In this embodiment, the connecting portion 2214 is an isosceles trapezoid plane, a bottom of the isosceles trapezoid plane is connected to the first surface 2211, an upper bottom of the isosceles trapezoid plane is connected to the second surface 2212, and waists of the isosceles trapezoid plane are connected to the two reflecting portions 2213 respectively.

In some embodiments, a square prism having a second surface 2212 as its top base, a first surface 2211 as its bottom base, and two reflecting portions 2213 and two connecting portions 2214 as its side faces may be used as the shaper 221.

In this embodiment, the polarizer assembly 222 includes two polarization splitting prisms 223 connected to each other, and the two polarization splitting prisms 223 are connected together, so as to avoid the two polarization splitting prisms 223 from being relatively located or dislocated when the temperature changes.

In some embodiments, the two polarization beam splitters 223 may be adhered by an adhesive, and the adhesive may be an adhesive having a refractive index close to that of the material of the polarization beam splitters 223. Of course, the two polarization splitting prisms 223 may be fixed by the polarizer support through an external force without setting an adhesive to enhance the light transmittance.

Each polarization splitting prism 223 includes a third surface 2221 and a fourth surface 2222, and a polarization splitting film 2231 between the third surface 2221 and the fourth surface 2222, and the two polarization splitting films 2231 are perpendicular to each other and are symmetrically disposed about the optical axis X of the light recovery unit 210.

Image light L₂₂The polarized light splitting film 2231 splits the light to form first polarized light L₄₁And light of the second polarization L₄₂Each polarization splitting film 2231 is for splitting the first polarized light L₄₁Transmitted to the image display surface 231, and used for transmitting the second polarized light L₄₂Reflect to the other polarization splitting film 2231, and reflect the second polarized light L reflected by the other polarization splitting film 2231₄₂And is reflected to the light-emitting assembly 210. The polarizer assembly 222 can simultaneously realize light recovery and polarization through the two polarization splitting prisms, and has the advantages of few used optical elements, simple and practical structural design.

The polarization splitting prism 223 may include two right-angle prisms 224, inclined surfaces of the two right-angle prisms 224 are glued to each other, and one of the inclined surfaces of the right-angle prisms 224 is provided with a polarization splitting film 2231. The third surface 2221 is a rectangular edge surface of one of the rectangular prisms 224 facing the shaper 221, and the fourth surface 2222 is a rectangular edge surface of the other rectangular prism 224 facing away from the shaper 221.

In this embodiment, the light valve 230 is adapted to modulate P-polarized light, the polarization splitting films 2231 may be a dielectric film having functions of transmitting P-polarized light and reflecting S-polarized light, so that the P-polarized light completely passes through, and the S-polarized light may be incident to the light exit component 210 after being totally reflected between the two polarization splitting films 2231, thereby effectively avoiding light waste and further improving light utilization rate.

Fig. 5 is another schematic structural diagram of a projection apparatus provided in an embodiment of the present application, and referring to fig. 2 and fig. 5, in the embodiment, the light emitting assembly 210 includes a laser module 211 and a color wheel 212, and the laser module 211 is configured to emit an excitation light L₀The color wheel 212 is disposed on the light emitting path of the laser module 211 for receiving the excitation light L₀And generates illumination light L₁And for diffusely reflecting the recycled light recycled to the color wheel 212, the diffusely reflected recycled light may be incident to the light recycling assembly 220 for reuse.

The diffuse reflection of the color wheel 212 may convert the second polarized light L₄₂The natural light is converted into natural light in a non-polarization direction, after the natural light in the non-polarization direction is acted by the collecting lens group 250, the large-angle light irradiates the shaper 221, the small-angle light penetrates through the shaper 221 and irradiates the polarizer assembly 222 to be split to form first polarized light which is incident on the image display surface 231, and therefore the first polarized light can be reused.

The color wheel 212 may be a rotating color wheel, a ribbon barrel wheel, or a periodic translation sheet, and any device capable of exciting fluorescence and reflecting the recovered light back into the optical path is within the scope of the present disclosure.

The laser module 211 may include three laser generators 2111 arranged in an array, and each laser generator 2111 is configured to emit blue excitation light L₀。

The light-emitting assembly 210 can further comprise a light homogenizing device 213 and a positive lens 214, wherein the light homogenizing device 213 and the positive lens 214 corresponds to the number of laser generators 2111, and each laser generator 2111 emits excitation light L₀The shaped light is incident to the positive lens 214 through the light homogenizing device 213, and is imaged on the color wheel 212 by the positive lens 214, and the positive lens 214 can collect the excitation light L₀To reduce the excitation light L₀The divergence angle of (c).

The color wheel 212 may be a transmissive color wheel, the color wheel 212 may include a transparent substrate 2121, a scattering sheet 2122 and a polarizer 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 sheet 2122 is disposed on the substrate light incident surface 2127, the polarizer 2123 is disposed on the substrate light emitting surface 2128, and the excitation light L is emitted from the laser module L₀Illumination light L is formed through the diffuser 2122 and the polarizing plate 2123 in this order₁The polarizing plate 2123 is also used to split the recycled light recycled to the polarizing plate 2123 and then partially reflect the split light to the light recycling assembly 220.

Specifically, the scattering sheet 2122 is used for scattering the incident excitation light L₀Scattering is performed, exciting light L₀The scattered emergent light can be formed by the scattering sheet 2122, and the effect of eliminating laser speckles is achieved. The polarizer 2123 may be a polarization splitting sheet having a function of transmitting P-polarized light and reflecting S-polarized light, and when the recovered light is recycled to the polarizer 2123, the recovered light is split to generate P-polarized light and S-polarized light, and at the same time, the S-polarized light may be reflected by the polarizer 2123 to the light recycling assembly 220 for reuse, and the P-polarized light may pass through the polarizer 2123 to form waste light. The polarizing plate 2123 is used for recovering S-polarized light, so that waste caused by the fact that S-polarized light and P-polarized light penetrate through the scattering sheet 2122 to form useless light is avoided, light circulation can be achieved as much as possible, and the utilization efficiency of light is further improved.

The color wheel 212 may further include a phosphor layer 2124, the phosphor layer 2124 is disposed on the transparent substrate 2121, and the excitation light L₀Excited by the phosphor layer 2124 to generate fluorescence as illumination light L₁. The phosphor layer 2124 has a rough surface, and the phosphor layer 2124 is further configured to diffuse and reflect the recovered light recovered to the phosphor layer 2124, and then re-enter the light recovery assembly 220, so as to reuse the light.

The phosphor layer 2124 may be wrappedIncluding a red phosphor layer 2125 and a green phosphor layer 2126, the red phosphor layer 2125, the green phosphor layer 2126, and a diffusion sheet 2122 (or a polarizing plate 2123) are concentrically arranged and respectively correspond to one laser generator 2111. One of the laser generators 2111 emits blue excitation light L₀The red fluorescent powder layer 2125 excites to generate red illuminating light L₁Blue excitation light L emitted from another laser generator 2111₀The green fluorescent powder layer 2126 excites to generate green illumination light L₁The remaining one of the laser generators 2111 emits blue excitation light L₀The blue illumination light L is generated after sequentially passing through the diffuser 2122 and the polarizer 2123₁. Thus, the light-emitting assembly 210 can generate three different colors of illumination light that are spatially separated from each other.

The projection apparatus 200 may further include a collection lens group 250, wherein the collection lens group 250 is disposed on a light path between the light-emitting assembly 210 and the light-recycling assembly 220, and is used for collecting the illumination light L emitted from the light-emitting assembly 210₁To the light recycling assembly 220, and for collecting the recycled light reflected by the light recycling assembly 220 to the color wheel 212. The collecting lens group 250 is used for reducing the divergence angle of the light beam and realizing the convergence of the light beam.

The collection lens group 250 can include two elliptical collection lenses, one of which is near the light recovery component 220 and the other of which is near the light exit component 210, to achieve better light collection effect.

The three color light beams generated by the light-emitting component 210 pass through the collecting lens group 250 and then enter the light recycling component 220, and the three color light beams are mutually overlapped on the incident surface of the light recycling component 220, the three color light beams are mutually separated in angular space, spatial solid angles are not overlapped, but on the surface space, because the propagation distance is not far enough, the three color light beams are mutually overlapped in a near field to form white light.

In this embodiment, the non-image light L₂₁Is a large-angle light ray, image light L, in the light beam emitted from the color wheel 212 to the light recycling assembly 220₂₂Is a small angle ray of the light beam exiting the color wheel 212 to the light recycling assembly 220. Wherein the large angle isThe included angle between the light ray and the optical axis X of the light recycling assembly 220 may be greater than the set included angle α, and the included angle between the small-angle light ray and the optical axis X of the light recycling assembly 220 may be smaller than the set included angle α. Under the condition that the collection lens group 250 is not provided, assuming that the red phosphor layer 2125 is located at the innermost side of the color wheel 212, the first end point is located at a side of the red phosphor layer 2125 close to the center of the color wheel 212, the second end point is located at the connection position of the reflection portion 2213 and the polarizer assembly 222, and the set included angle α may be approximately equal to an included angle value between a connection line between the first end point and the second end point and the optical axis X of the light recycling assembly 220, so as to ensure that the light rays with the largest angle can be completely recycled, and further improve the light utilization efficiency.

FIG. 6 is a light path diagram of the projection apparatus provided in the embodiment shown in FIG. 5, referring to FIG. 2, FIG. 5 and FIG. 6, showing the non-image light L₂₁After being totally reflected twice by 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 and is diffused and emitted, and is reused by the light recycling assembly 220. The green light returns to the green phosphor layer 2126, and is diffused and emitted out to be reused by the light recycling assembly 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 collecting lens group 250 and is reused by the light recycling assembly 220, and the P-polarized light passes through the polarizer 2123 and becomes waste light.

Shaped light L entering polarizer assembly 222₃Is split into first polarized light L₄₁(e.g., P-polarized light) and second polarized light L₄₂(e.g., S-polarized light), second polarized light L₄₂After two reflections, the light returns to the collecting lens group 250, and then returns to the respective light emitting areas on the color wheel 212, and then is emitted through the diffuse reflection of the red phosphor layer 2125 and the green phosphor layer 2126, so that natural light which can be reused is formed, and light circulation is realized. In addition, the light beam reflected to the polarizing plate 2123 is split and emitted, and the S-polarized light therein can be reused.

The projection apparatus 200 may further include a microlens array disposed on the image display surface of the light valve 230, and 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 kinds of colours that separate each other in the angular space can carry out the face angle conversion after the microlens array, promptly after the microlens array, the light of separation in the angular space can separate in the face space, make the light beam of different colours shine on corresponding liquid crystal pixel, in order to avoid the TFT wire in the light valve 230, thereby effectively reduce the light efficiency loss that the TFT wire brought, the utilization efficiency of light has been improved, increase the maximum output luminance, the heat on the light valve 230 has been reduced simultaneously, the reliability of light valve 230 has been improved.

Fig. 7 is a schematic structural diagram of a projection apparatus according to another embodiment of the present application, referring to fig. 2 and 7, in this embodiment, the color wheel 212 may be a reflective color wheel, the color wheel 212 may include a reflective substrate 2171, a phosphor layer 2172, and scattering sheets 2173, the reflective substrate 2171 includes a substrate reflective surface 2176, the phosphor layer 2172 and the scattering sheets 2173 are disposed on the substrate reflective surface 2176, and the excitation light L is emitted from the excitation light L₀Incident to the phosphor layer 2172 and excited to generate fluorescence as the illumination light L₁The phosphor layer 2172 also functions to diffusely reflect the light beam recovered to the phosphor layer 2172 so that the light beam can be re-incident to the light recovery assembly 220 for light recycling. Excitation light L₀Also incident on the diffuser 2173 and reflected to form illumination light L₁The scattering sheet 2173 is also used to diffuse the recovered light recovered to the scattering sheet 2173 so that the light beam can be re-incident to the light recovery assembly 220 for light recycling.

The substrate reflective surface 2176 may be coated with a material having diffuse reflective properties, the phosphor layer 2172 and the scattering sheets 2173 are disposed on the substrate reflective surface 2176, the phosphor layer 2172 may include a red phosphor layer 2174 and a green phosphor layer 2175, and the red phosphor layer 2174, the green phosphor layer 2175 and the scattering sheets 2173 are concentrically disposed.

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

The laser module 211 can be a laser generator for emitting blue excitation lightL₀。

In this embodiment, the light emitting assembly 210 may further include a light uniformizing device 215 and a reflecting mirror 216, the light uniformizing device 215 and the reflecting mirror 216 are sequentially disposed on the light emitting path of the laser module 211, and the blue excitation light L emitted by the laser module 211 is₀The incident light is shaped into three blue excitation lights L with different emission directions by the dodging device 215₀And then reflected by the reflector 216 to the collecting lens group 250, and then imaged on the color wheel 212.

The light uniformizing device 215 may be a fly-eye lens formed by combining a series of small lenses, which can obtain high light energy utilization rate and large area uniform illumination.

The mirror 216 may be a polarized coated glass plate, and the mirror 216 is located outside the optical path between the collection lens group 250 and the light recycling assembly 220 to prevent blocking of the transmission path of the illumination light.

In some embodiments, the laser module 211 may also include three laser generators for generating three blue laser beams with different emission directions.

In this embodiment, three blue laser beams with different emitting directions are transmitted through the collecting lens group 250 and then imaged on the red phosphor layer 2174, the green phosphor layer 2175 and the scattering sheet 2173, respectively, wherein one blue laser beam is excited in the red phosphor layer 2174 to generate red illumination light, the other blue laser beam is excited in the green phosphor layer 2175 to generate green illumination light, and the remaining blue laser beam is reflected on the scattering sheet 2173 to generate blue illumination light. Thus, the light-emitting assembly 210 can generate three different colors of illumination light that are spatially separated from each other.

The three colors of illumination light generated by the light-emitting component 210 are transmitted through the collecting lens group 250 and then incident to the light recycling component 220, and the three colors of light beams are mutually overlapped on the incident surface of the light recycling component 220, the three colors of light beams are mutually separated in angular space, spatial solid angles are not overlapped, but on the surface space, because the propagation distance is not far enough, the three colors of light beams are mutually overlapped in a near field to form white light.

Fig. 8 is a light path diagram of the projection apparatus provided in the embodiment shown in fig. 7, and in conjunction with fig. 7 and 8, the non-image light returns to the collection lens group 250 after undergoing two total reflections by the shaper 221, and is imaged on the respective light emitting surfaces. Specifically, the red light may return to the red phosphor layer 2174 and be diffusely reflected out for reuse by the light recycling assembly 220. The green light returns to the green phosphor layer 2175 and is then diffusely reflected and recycled by the light recycling assembly 220. The blue light will return to the diffuser 2173 and will be diffusely reflected and recycled by the light recycling assembly 220.

The shaped light entering the polarizer assembly 222 is split into a first polarized light (for example, P-polarized light) and a second polarized light (for example, S-polarized light), and the second polarized light is reflected twice and then enters the collecting lens group 250, and then enters the respective light emitting regions on the color wheel 212, and then is emitted through diffuse reflection, so as to form a natural light that can be reused, thereby realizing light circulation.

It can be understood that the light recycling assembly provided by the embodiment of the present application, due to the presence of the shaper and the light deflection assembly, can realize light beam shaping and recycling by only one assembly, thereby reducing the volume of the whole light path design, reducing the cost, improving the light utilization efficiency, and being flexibly applicable to various projection, illumination and other display scenes; meanwhile, in the projection system provided by the embodiment of the application, the light recovery assembly reshapes and splits the illumination light to form the first polarized light which is emitted to the image display surface, and because the shape of the light spot of the first polarized light is matched with that of the image display surface, all areas of the image display surface can be illuminated by the light beam, and the light beam which is finally incident to the image display surface is the light beam with a specific polarization direction, so that the color crosstalk problem can be effectively avoided. The light recycling assembly is also used for guiding the rest of the illuminating light to the light emitting assembly to form recycled light, the recycled light can be incident to the light recycling assembly again after being reflected by the light emitting assembly to realize light circulation, and the utilization efficiency of the light is effectively improved.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A light recovery module comprising a shaper and a polarizer module, wherein,

the shaper is used for shaping the illumination light input into the light recovery component to form non-image light and image light with a preset light spot shape, the image light is irradiated to the polarizer component, and the non-image light is recovered by the shaper;

the polarizer component is used for splitting the image light into first polarized light and 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 recycled light.

2. The light recycling assembly of claim 1, wherein the shaper is integral with the polarizer assembly.

3. A light recovery assembly in accordance with claim 1 wherein the shaper comprises opposing first and second surfaces, the illumination light entering from the first surface and the image light exiting from the second surface; the polarizer assembly includes a third surface from which the image light is incident and a fourth surface from which the first polarized light exits; the third surface abuts against the second surface.

4. A light recycling assembly according to claim 3, wherein said shaper further comprises two symmetrically disposed reflective portions, each said reflective portion disposed between and coupled to said first surface and said second surface, each said reflective portion for reflecting said non-image light to another said reflective portion and recycling said non-image light reflected by another said reflective portion.

5. A light recovery assembly according to claim 3 wherein the second surface of the shaping device is shaped to a predetermined shape to shape the illumination light to form the image light.

6. A light recovery assembly according to any of claim 3 wherein the polarizer assembly comprises two interconnected polarizing beam splitting prisms, each of the polarizing beam splitting prisms comprising the third and fourth surfaces and a polarizing beam splitting film positioned between the third and fourth surfaces, the two polarizing beam splitting films being perpendicular to each other and symmetrically disposed with respect to each other; each of the polarization splitting films is configured to transmit the first polarized light, and to reflect the second polarized light to the other polarization splitting film and to recover the second polarized light reflected by the other polarization splitting film.

7. A projection system comprising a light exit element, a light valve, and the light recovery element of any of claims 1-6, the light recovery element and the light valve being disposed in series on an exit light path of the light exit element,

the light emitting component is used for emitting the illuminating light and reflecting the recycled light to the light recycling component;

the light valve comprises an image display surface and is used for modulating light irradiated on the image display surface;

the light recovery assembly guides the first polarized light to the image display surface and guides the recovered light to the light outlet assembly, wherein the shape of the preset light spot of the first polarized light is matched with the shape of the image display surface.

8. The projection device of claim 7, wherein the light extraction assembly comprises:

the laser module is used for emitting exciting light;

and the color wheel is arranged on the light emitting path of the laser module, is used for receiving the exciting light and generating the illuminating light, and is used for performing diffuse reflection on the recovered light recovered to the color wheel.

9. The projection apparatus according to claim 8, wherein the color wheel includes a transparent substrate, a scattering sheet, and a polarizing plate, the transparent substrate includes a substrate light incident surface and a substrate light emergent surface opposite to each other, the scattering sheet is disposed on the substrate light incident surface, the polarizing plate is disposed on the substrate light emergent surface, the excitation light sequentially penetrates through the scattering sheet and the polarizing plate to form the illumination light, and the polarizing plate is further configured to split the recovered light recycled to the polarizing plate and then partially reflect the split light to the light recycling assembly.

10. The projection apparatus according to claim 8, wherein 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 disposed on the substrate reflective surface, the excitation light is incident on the phosphor layer and excites to generate fluorescent light as the illumination light, and the phosphor layer is further configured to diffuse the recovered light recovered to the phosphor layer; the exciting light is incident to the scattering sheet and reflected to form the illuminating light, and the scattering sheet is further used for performing diffuse reflection on the recovered light recovered to the scattering sheet.

11. The projection device of claim 8, wherein the projection display device further comprises a collection lens group disposed on the light path between the color wheel and the light recycling assembly for collecting the illumination light to the light recycling assembly and for collecting the recycled light to the color wheel.

12. The projection apparatus according to claim 7, further comprising a microlens array disposed on the image display surface.