CN220171390U - Optical system and projection apparatus - Google Patents

Abstract

The utility model discloses an optical system and projection equipment, and relates to the technical field of photoelectricity. According to the utility model, the first wavelength light generated by the light source device is polarized and split into the first polarized light propagating along the first channel and the second polarized light propagating along the second channel by the polarization splitting element, and the first channel and the second channel are respectively provided with the liquid crystal panel for modulating the first polarized light and the second polarized light, so that the first wavelength light generated by the light source device is fully utilized, and the brightness is improved. In addition, the utility model can only need two liquid crystal panels, and compared with a projection system adopting three liquid crystal panels, the utility model reduces the cost.

Description

Optical system and projection apparatus

Technical Field

The present utility model relates to the field of photoelectric technology, and in particular, to an optical system and a projection device.

Background

Currently, projectors are widely used in a variety of contexts, such as office briefs, playing movies, device art, and the like. Most projectors are based on spatial light modulators (SLM, spatial Light Modulator), which mainly include transmissive LCD (Liquid Crystal Display, liquid crystal) projection, reflective LCoS (Liquid Crystal on Silicon ) projection, and reflective DMD (Digital Micro-Mirror Device) projection. The liquid crystal panel can only pass through the light rays with specific polarization states (such as P or S) so as to control the picture to be displayed, and the illumination light rays entering the liquid crystal panel need to be subjected to polarization state control, so that brightness loss is caused.

Disclosure of Invention

In view of the above, the present utility model provides an optical system and a projection apparatus, which can reduce cost and improve brightness.

In a first aspect, the present utility model provides an optical system comprising:

a light source device for generating light of a first wavelength;

the polarization splitting element is positioned at the light emitting side of the light source device and is used for polarization splitting of the first wavelength light and splitting the first wavelength light into first polarized light propagating along the first channel and second polarized light propagating along the second channel, wherein the first polarized light has a first polarization state, and the second polarized light has a second polarization state;

the first liquid crystal panel is arranged on the first channel and used for modulating the first polarized light;

the second liquid crystal panel is arranged on the second channel and used for modulating the second polarized light.

In a possible implementation manner, the light source device is further configured to generate a second wavelength light with a first polarization state, where the first wavelength light and the second wavelength light may be synthesized into white light;

the polarization beam splitting element is further configured to guide light of a second wavelength in the first polarization state to propagate along the first channel;

the first liquid crystal panel is also used for modulating the second wavelength light of the first polarization state.

In a possible implementation manner, the light source device is further configured to generate third wavelength light with a first polarization state and fourth wavelength light with a second polarization state, where the first wavelength light, the third wavelength light and the fourth wavelength light may synthesize white light;

the polarization beam splitting element is further configured to guide light of a third wavelength in the first polarization state to propagate along the first channel, and guide light of a fourth wavelength in the second polarization state to propagate along the second channel;

the first liquid crystal panel is further used for modulating the third wavelength light of the first polarization state;

the second liquid crystal panel is further configured to modulate light of a fourth wavelength of the second polarization state.

In a possible implementation, the first wavelength light may be mixed by the fifth wavelength light and the sixth wavelength light.

In a possible implementation, the first wavelength light includes green light.

In a possible implementation, the first wavelength light includes two of red light, green light, and blue light, and the second wavelength light is one of the red light, the green light, and the blue light other than the two light.

In a possible implementation, the first wavelength light, the third wavelength light and the fourth wavelength light are different colors of light and are selected from red light, green light and blue light, respectively; or,

the first wavelength light includes two kinds of light of red light, green light, and blue light, the third wavelength light is one kind of light other than the two kinds of light of red light, green light, and blue light, and the fourth wavelength light is one kind of light of the two kinds of light.

In a possible implementation manner, the first liquid crystal panel includes a first color filter element, the second liquid crystal panel includes a second color filter element, the first color filter element has a first wavelength color filter region, and the second color filter element has a fifth wavelength color filter region and a sixth wavelength color filter region.

In a possible implementation manner, the first liquid crystal panel includes a first color filtering element, the second liquid crystal panel includes a second color filtering element, the first color filtering element has a first color filtering area and a second color filtering area, the second color filtering element has a third color filtering area and a fourth color filtering area, wherein the first color filtering area is used for filtering the first wavelength light, the second color filtering area is used for filtering the second wavelength light, the third color filtering area is used for filtering one light of the two lights, and the fourth color filtering area is used for filtering the other light of the two lights.

In a possible implementation manner, the first liquid crystal panel includes a first color filter element, and the second liquid crystal panel includes a second color filter element;

when the first wavelength light, the third wavelength light and the fourth wavelength light are light of different colors and are respectively selected from red light, green light and blue light, the first color filter element has a first wavelength color filter region and a third wavelength color filter region, and the second color filter element has a first wavelength color filter region and a fourth wavelength color filter region;

when the first wavelength light includes two kinds of light of red light, green light, and blue light, the third wavelength light is one of red light, green light, and blue light other than the two kinds of light, and the fourth wavelength light is one of the two kinds of light, the first color filter element has a first wavelength color filter region and a third wavelength color filter region, and the second color filter element has a first wavelength color filter region and a fourth wavelength color filter region; or,

the first color filter element has a fifth color filter region for filtering light of a first wavelength, a sixth color filter region for filtering light of a third wavelength, a seventh color filter region for filtering one of the two lights, and an eighth color filter region for filtering the other of the two lights.

In a possible implementation, the light source device includes a first light source for generating excitation light and a first wavelength conversion device for generating the first wavelength light under irradiation of the excitation light.

In a possible implementation manner, the light source device includes a second light source, a first light splitting and combining element, a first polarization conversion element and a second wavelength conversion device, wherein,

the second light source is used for generating light with a second wavelength;

the first light splitting and combining element is used for splitting the second wavelength light generated by the second light source into the second wavelength light with the first polarization state and the second wavelength light with the second polarization state, guiding the second wavelength light with the first polarization state to propagate to the second wavelength conversion device, and guiding the second wavelength light with the second polarization state to propagate to the first polarization conversion element;

the first polarization conversion element is used for converting incident second-wavelength light in a second polarization state into second-wavelength light in a first polarization state;

the second wavelength conversion device is used for converting incident second wavelength light with a first polarization state into first wavelength light;

the first light splitting and combining element is further used for guiding the second wavelength light with the first polarization state emitted by the first polarization conversion element and the first wavelength light emitted by the second wavelength conversion device to propagate to the polarization light splitting element.

In a possible implementation, the light source device comprises a third light source, a fourth light source and a wavelength conversion device, wherein,

the third light source is used for generating excitation light;

the fourth light source is configured to generate third wavelength light of the first polarization state and fourth wavelength light of the second polarization state;

the wavelength conversion device is used for generating the first wavelength light under the irradiation of the excitation light.

In a possible implementation manner, the light source device includes a fifth light source, a sixth light source, a second light splitting and combining element, a second polarization conversion element and a third wavelength conversion device, where,

the fifth light source is used for generating light with a third wavelength;

the second light splitting and combining element is configured to split the third wavelength light generated by the fifth light source into the third wavelength light in the first polarization state and the third wavelength light in the second polarization state, and guide the third wavelength light in the first polarization state to propagate to the third wavelength conversion device, and guide the third wavelength light in the second polarization state to propagate to the second polarization conversion element;

the second polarization conversion element is used for converting incident third-wavelength light in a second polarization state into third-wavelength light in a first polarization state;

the third wavelength conversion device is used for converting incident third wavelength light with a first polarization state into first wavelength light;

the light splitting and combining element is further used for guiding third wavelength light in a first polarization state emitted by the second polarization conversion element and first wavelength light emitted by the third wavelength conversion device to propagate to the polarization light splitting element;

the sixth light source is configured to generate light of a fourth wavelength in the second polarization state.

In a second aspect, the present utility model provides a projection device comprising the optical system of the first aspect.

According to the utility model, the first wavelength light generated by the light source device is polarized and split into the first polarized light propagating along the first channel and the second polarized light propagating along the second channel by the polarization splitting element, and the first channel and the second channel are respectively provided with the liquid crystal panel for modulating the first polarized light and the second polarized light, so that the first wavelength light generated by the light source device is fully utilized, and the brightness is improved. In addition, the utility model can only need two liquid crystal panels, and compared with a projection system adopting three liquid crystal panels, the utility model reduces the cost.

Drawings

FIG. 1 is a functional block diagram of a conventional projection device;

FIG. 2 is a schematic diagram of a conventional projection apparatus;

fig. 3 is a schematic structural diagram of a projection device according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of another projection apparatus according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a projection apparatus according to another embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a projection apparatus according to another embodiment of the present utility model.

Detailed Description

In order to better understand the technical solutions of the present utility model, the following description will clearly and completely describe the technical solutions of the embodiments of the present utility model, and it is obvious that the described embodiments are only some embodiments of the present utility model, not all embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. While the present disclosure has been described in terms of an exemplary embodiment or embodiments, it should be understood that each aspect of the disclosure may be separately provided as a complete solution. The following embodiments and features of the embodiments may be combined with each other without conflict.

In the present utility model, for the purpose of clearly describing the technical solutions of the embodiments of the present utility model, the words "first", "second", etc. are used to distinguish identical items or similar items having substantially identical functions and actions, and those skilled in the art will understand that the words "first", "second", etc. do not limit the number and execution order, but merely serve to illustrate and distinguish between the objects to be described, without separating the order, nor do they represent that the number of devices or messages in the embodiments of the present utility model is particularly limited, and cannot constitute any limitation of the embodiments of the present utility model. "plurality" means two or more, and the like, means that the element or article recited in the preceding word "comprise" or "comprises", and the like, is meant to encompass the element or article listed thereafter and equivalents thereof without precluding other elements or articles.

In order that the utility model may be fully understood, a detailed description will be provided below in order to illustrate the technical aspects of the utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

Fig. 1 is a schematic functional block diagram of a conventional projection device. As shown in fig. 1, the projection device includes an image processor 101 and a projection light engine 102. Wherein:

the image processor 101 may be a microcontroller, a dedicated image processing chip, etc., and the microcontroller may be an ARM chip, a micro control unit (Microcontroller Unit; MCU), etc.; the dedicated image processing chip may be an image signal processor (Image Signal Processing, ISP), a graphics processor (graphics processing unit, GPU), an embedded neural network processor (neural-network process units, NPU), or the like. The image processor 101 may be used for video decoding, image quality processing, and the like.

The projection light engine 102 may include a driver chip, a spatial light modulator, a light source, and the like. Wherein the light source may include a laser light source, an LED light source, a fluorescent light source, etc.; the spatial light modulator may be a digital micromirror device (Digtial Micromirror Devices, DMD), a liquid crystal device (Liquid Crystal Display, LCD), a liquid crystal on silicon device (Liquid Crystal on Silicon, LCOS), or the like, for modulating light source light to generate image light; the driver chip corresponds to a spatial light modulator, for example, a digital micromirror device may be driven with a digital light processing element (Digital Light Processing, DLP). The projection light machine 102 is used for projecting an image to be projected into a projection screen.

In some embodiments, the projection device further includes a central controller 103, which may be a CPU, ARM, MCU or like controller, of one or more processing cores. The central controller 103 is a control center of the projection device, and may run or execute software programs and/or an operating system stored in the storage module 104 and invoke data stored in the storage module 104 using various interfaces and lines to connect various parts of the entire projection device. Alternatively, the image processor 101 and the central controller 103 may be integrated as one processor.

In some embodiments, the projection device further includes a storage module 104, an input module 105, and components of a communication module 106, a power supply 107, and the like, of one or more computer-readable storage media. It will be appreciated by those skilled in the art that the projection device structure shown in FIG. 1 is not limiting of the projection device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. Wherein:

the memory module 104 may be used to store software programs and an operating system, and the central controller 103 executes various functional applications and data processing by running the software programs and the operating system stored in the memory module 104. The storage module 104 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data created according to the use of the projection device, etc. In addition, the memory module 104 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory module 104 may also include a memory controller to provide access to the memory module 104 by the central controller 103.

The projection device may further comprise an input module 105, which input module 105 may be used to receive entered numerical or character information and to generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

The projection device may also include a communication module 106, and in some embodiments the communication module 106 may include a wireless module, through which the projection device may wirelessly transmit over short distances, thereby providing wireless broadband internet access to the user. For example, the communication module 106 may be used to assist a user in accessing streaming media, and the like.

The projection device further includes a power supply 107 for powering the various components, and in some embodiments, the power supply 107 may be logically connected to the central controller 103 via a power management system, such that charge, discharge, and power consumption management functions are performed by the power management system. The power supply 107 may also include one or more of any of a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.

Fig. 2 is a schematic structural diagram of a conventional projection apparatus. As shown in fig. 2, the projection apparatus includes a light source device 201, an illumination optical system 202, and an imaging system 203. Wherein the light source device 201 comprises one or more light sources; the illumination optical system 202 includes an optical element for processing light emitted from the light source device 201; the light beam emitted from the light source device 201 is irradiated to a spatial light modulator (not shown) via an illumination optical system 202, and the spatial light modulator irradiates its incident light into an imaging system 203, and finally images the image light onto a projection object such as a screen, and the imaging system 203 is typically a lens system, such as a projection lens.

The projection apparatus may further include a light source control module (not shown in the figure) that controls the operation of one or more light sources in the light source device 201 such that the light source device 201 emits light of a prescribed wavelength band required when generating an image. Further, the light source device 201, the illumination optical system 202, and the imaging system 203 may be included in the projection light machine 102 (refer to fig. 1).

In recent years, LCD projection has been attracting attention due to the advantage of low price. The LCD projection is a transmissive liquid crystal projection, and the LCOS projection is a reflective liquid crystal projection, and the embodiments of the present utility model will be described with reference to a transmissive LCD projection device.

Fig. 3 is a schematic structural diagram of a projection device according to an embodiment of the present utility model. As shown in fig. 3, the projection apparatus includes a light source device 301, a polarization splitting element 5, a first LCD panel 6, a light combining element 7, a second LCD panel 8, and a projection lens 9, where the light emitted from the light source device 301 is polarized and split by the polarization splitting element 5, and is split into two paths to be respectively incident on the first LCD panel 6 and the second LCD panel 8, the first LCD panel 6 and the second LCD panel 8 modulate the incident light, and the incident light is combined by the light combining element 7 and then irradiated into the projection lens 9, and finally the image light is imaged on the projection screen.

The light source device 301 is configured to emit illumination light, where the illumination light may include a single wavelength band or may include a plurality of different wavelength bands. The light source device 301 may be a single light source, or may include a plurality of light sources, and the light source may be a laser light source, an LED light source, a fluorescent light source, or the like. Further, the light source may be a single light emitting element or an array of light emitting elements, and the array of light emitting elements may include light emitting elements of different colors, for example, the light source is a multicolor laser, the light source is an array of light emitting elements including multiple lasers, for example, the light source may include a blue laser and a red laser, or include a blue laser and a green laser, or include a blue laser, a red laser and a green laser at the same time.

The polarization splitting element 5 is configured to split the illumination light emitted from the light source device 301 into a first polarized light propagating along the first channel and a second polarized light propagating along the second channel, where the first polarized light has a first polarization state and the second polarized light has a second polarization state. In the embodiment of the present utility model, it is assumed that the first polarization state is S state and the second polarization state is P state.

The first LCD panel 6 is configured to modulate the first polarized light to form first modulated light, including a first color filter element; the second LCD panel 8 is configured to modulate the second polarized light to form second modulated light, including second color filter elements. The first color filter element of the first LCD panel 6 may include one or more color filter regions, and the second color filter element of the second LCD panel 8 may include one or more color filter regions, for example, the first color filter element may include a red color filter region, a green color filter region, and a blue color filter region if the illumination light emitted from the light source device 301 is white light, and the second color filter element may include a red color filter region, a green color filter region, and a blue color filter region; for example, the illumination light emitted by the light source device 301 is light mixed by multiple colors, such as yellow light (mixed by red light and green light), and the first color filter element may include a red color filter area and a green color filter area, and the second color filter element may include a red color filter area and a green color filter area or directly include a yellow color filter area, where it is to be noted that the yellow color filter area may be an area with a corresponding color filter function or a transparent area without any color filter function; for another example, the illumination light emitted by the light source device 301 is light with a single wavelength band, such as green light, and the first color filter element may include a green color filter region, and the second color filter element may include a green color filter region.

In a 2LCD projection system, the original Image may be divided into a first pixel Image and a second pixel Image, denoted as Image1 and Image2; wherein Image1 is input to the first LCD panel 3 and Image2 is input to the second LCD panel 9; the scan driver of the first LCD panel 3 starts controlling the polarization splitting characteristics of the liquid crystal molecules row by row according to the image data of the first LCD panel 3; the second scan driver of the second LCD panel 9 starts controlling the polarization splitting characteristics of the liquid crystal molecules row by row according to the image data of the second LCD panel 9; the scanning time of the two paths of LCD is nearly equal or the time difference is smaller than a preset value; after the scan driver one/two scans are completed, reset is performed according to Vblank.

Fig. 4 is a schematic structural diagram of another projection apparatus according to an embodiment of the present utility model. As shown in fig. 4, the projection apparatus includes a first light source 3, a light-splitting element 4, a polarization conversion element 1, a wavelength conversion device 2, a polarization-splitting element 5, a first LCD panel 6, a light-combining element 7, a second LCD panel 8, and a projection lens 9. The light source light generated by the first light source 3 is split into light source light of a first polarization state and light source light of a second polarization state by the light splitting and combining element 4, and the light source light of the first polarization state is guided to propagate to the wavelength conversion device 2, and the light source light of the second polarization state is guided to propagate to the polarization conversion element 1; the polarization conversion element 1 converts the incident light source light of the second polarization state into light source light of the first polarization state; the wavelength conversion device 2 converts the incident light source light of the first polarization state into stimulated luminescence; the light source light with the first polarization state emitted by the polarization conversion element 1 and the excited light emitted by the wavelength conversion device 2 are guided to propagate to the polarization splitting element 5 through the light splitting and combining element 4, the polarization splitting element 5 splits the excited light into two paths and respectively enters the first LCD panel 6 and the second LCD panel 8, the light source light with the first polarization state is guided to propagate to the second LCD panel 8, the first LCD panel 6 modulates the excited light with the second polarization state to form first modulated light, the second LCD panel 8 modulates the excited light with the first polarization state and the light source light to form second modulated light, the first modulated light and the second modulated light are irradiated into the projection lens 9 after being combined by the light combining element 7, and finally the image light is imaged on the projection screen.

The first light source 3 may be a single light source, or may include a plurality of light sources, and the light sources may be laser light sources, LED light sources, fluorescent light sources, or the like. Further, the light source may be a single light emitting element or an array of light emitting elements. In this embodiment, the first light source 3 is used for emitting blue light BL.

Optionally, the light source includes a light source portion, the light source portion including a substrate and a plurality of light emitting elements. The substrate has a quadrangular shape such as a substantially square shape or a substantially rectangular shape in plan view. The substrate has a mounting surface on which the light emitting element is mounted, and the mounting surface is, for example, a flat surface. Further, a heat radiation member such as a radiator may be provided on a surface opposite to the mounting surface of the substrate. The substrate is formed of a material having high heat dissipation, for example, a metal material. The plurality of light emitting elements are arranged in an array with respect to the mounting surface of the substrate. The light emitting element is a laser light source having an emission surface from which laser light is emitted, and the light emitted from the light emitting element is blue light having a wavelength of 445nm, for example. Or may be an LED light source.

In some embodiments, each light emitted from the light source section is incident on the shaping lens. The shaping lens may have a plurality of collimating lenses. The collimator lenses may correspond to the light emitting elements in a one-to-one manner. Therefore, light emitted from each light emitting element is converted into parallel light by the corresponding collimator lens. Or the shaping lens comprises a focusing lens for shrinking the light beam; or the shaping lens comprises a microlens array for homogenizing and parallelizing the light beam.

The wavelength conversion device 2 may be a dynamic fluorescent wheel or a static fluorescent plate, and generates excitation light by incidence of the excitation light. In this embodiment, the wavelength conversion device 2 is a yellow fluorescent sheet, which generates yellow light under the irradiation of blue light.

The polarization conversion element 1 may include a 1/4 wavelength plate and a reflective substrate, and the light ray deflection angle before and after incidence of the 1/4 wavelength plate is deflected by 45 degrees.

The light splitting and combining element 4 has a polarization separation function of separating the blue light BL into the S-state blue light BLs and the P-state blue light BLp. Specifically, the light splitting and combining element 4 reflects the S-state blue light BLs and transmits the P-state blue light BLp. The spectral light combining element 4 has a polarization separation function, and also has a color separation function of transmitting yellow light components having different wavelength bands from the blue light BL regardless of the polarization state.

The polarization splitting element 5 has a polarization splitting function of splitting incident light into S-state light and P-state light, and specifically, the polarization splitting element 5 reflects S-state light and transmits P-state light. In other embodiments, the polarization beam splitter 5 may reflect the P-state light and transmit the S-state light.

Optionally, the projection device may further comprise a light guiding element, such as a mirror, a dichroic element or the like, for changing the propagation direction of the light. For example, two mirrors are used to guide one light emitted from the polarization splitting element 5 to the second LCD panel 8, as shown in fig. 4.

The color filter elements in the first LCD panel 6 comprise r+g color filter areas and the color filter elements in the second LCD panel 8 comprise b+y color filter areas. Alternatively, the color filter elements in the second LCD panel 8 may also include b+r+g color filter regions.

The light combining element 7 may combine light in a polarization state, for example, a PBS prism.

Specifically, the first light source 3 is divided into P-polarized blue light Bp and S-polarized blue light Bs by the light splitting element 4, the P-polarized blue light Bp is reflected and enters the polarization conversion element 1, the S-polarized blue light Bs is emitted by the polarization conversion element 1, and the P-polarized blue light Bp is transmitted to the polarization beam splitting element 5; the S-state polarized blue light Bs is transmitted and enters the wavelength conversion device 2 to generate yellow light Y, the yellow light Y is reflected by the light splitting element 4 and enters the polarization light splitting element 5, and the polarization light splitting element 5 performs polarization separation to form P-state polarized yellow light Yp and S-state polarized yellow light Ys; bs+ys is reflected by the polarization splitting element 5, yp is transmitted by the polarization splitting element 5, wherein the transmitted P-state polarized light Yp is incident on the first LCD panel 6, yp emits red light and green light through the r+g filter region of the color filter element; the reflected S-state polarized light ys+bs is incident on the second LCD panel 8, and ys+bs emits blue light and yellow light through the b+y filter region of the color filter element. Each frame of image data is split according to adjacent pixels and divided into two sub-image data, and the liquid crystal molecules of the first LCD panel 6 and the second LCD panel 8 are respectively controlled by a driver to be distributed, so that the projected images are spliced into emergent images. In this embodiment, only one light source is needed to achieve brightness enhancement.

Optionally, a second light source 10 may be added to the optical path shown in fig. 4, where the second light source 10 is used to generate P-polarized light, so that the outgoing light may be reflected by the polarizing beam splitter 5 and then be incident on the first LCD panel 6, as shown in fig. 5. For example, the second light source 10 may generate the P-state red light Rp or the P-state green light Gp, to increase the brightness of the red light or the green light. In other embodiments, the wavelength conversion device 2 may be a green fluorescent sheet, i.e. the excited light is green light, and the second light source 10 may be configured to generate P-state red light Rp, so that the blue light generated by the first light source 3, the excited light generated by the wavelength conversion device 2, and the light generated by the second light source 10 may be combined into white light.

The second light source 10 may be a single light source, or may include a plurality of light sources, and the light sources may be laser light sources, LED light sources, fluorescent light sources, or the like. Further, the light source may be a single light emitting element or an array of light emitting elements. If the light source can be a red laser light source or a red LED light source, the polarization control element can be used for adjusting the emitted red light into the P state.

The remaining components of the projection device shown in fig. 5 are the same as those of the embodiment shown in fig. 4, and will not be described again here.

Fig. 6 is a schematic structural diagram of a projection apparatus according to another embodiment of the present utility model. The embodiment shown in fig. 6 differs from the embodiment shown in fig. 4 in that the embodiment shown in fig. 6 does not include the polarization conversion element 1, the light generated by the first light source 3 is not polarized and separated by the light splitting and combining element 4, in this embodiment, the light splitting and combining element 4 may be a dichroic element, such as a blue light and a red light generated by the first light source 3 are transmitted, the green light generated by the wavelength conversion device 2 is reflected, and the third light source 11 is used for generating the P-state blue light Bp and the S-state red light Rs.

The blue light generated by the first light source 3 is transmitted to the wavelength conversion device 2 through the light splitting and combining element 4, the wavelength conversion device 2 generates green light under the irradiation of the blue light, the green light is reflected and transmitted to the polarization light splitting element 5 through the light splitting and combining element 4, the green light is split into P-state green light Gp and S-state green light Gs through the polarization light splitting element 5, the P-state blue light Bp and S-state red light Rs emitted by the third light source 11 are transmitted and transmitted to the polarization light splitting element 5 through the light splitting and combining element 4, so that the light passing through the polarization light splitting element 5 is divided into Bp+Gp and Rs+Gs, the transmitted P-state polarized light is incident on the first LCD panel 6, and the Bp+Gp emits blue light and green light through the B+G filtering area of the color filtering element; the reflected S-polarized light is incident on the second LCD panel 8, and rs+gs emits red light and green light through the r+g filter region of the color filter element. Since the green light helps to increase the projection brightness greatly, the embodiment makes the green light incident on the two LCD panels, so that the brightness can be effectively increased.

Alternatively, the wavelength conversion device 2 may also generate yellow light under the irradiation of blue light, and the third light source 1 may generate only blue light, such as S-state blue light, and the color filter elements in the first LCD panel 6 and the second LCD panel 8 may be the same as the embodiment shown in fig. 4.

In other embodiments, the wavelength conversion device 2 shown in fig. 6 is a dynamic fluorescent wheel, and multiple areas may be provided on the fluorescent wheel. For example, if two areas are provided on the fluorescent wheel, i.e. a green fluorescent area and a red fluorescent area are provided on the fluorescent wheel, the stimulated luminescence includes green light and red light, the third light source 11 may generate only blue light, i.e. S-state blue light, the color filter element of the first LCD panel 6 may include an r+g color filter area, and the color filter element of the second LCD panel 8 may include an r+g+b color filter area; in another example, a green fluorescent region and a reflective region (the reflective region may further include a polarization conversion element) are disposed on the fluorescent wheel, so that the light emitted by the wavelength conversion device 2 includes green light and blue light, the third light source 11 may generate only red light, such as S-state red light, the color filter element of the first LCD panel 6 may include a b+g color filter region, and the color filter element of the second LCD panel 8 may include an r+g+b color filter region; in another example, a yellow fluorescent area and a reflective area are arranged on the fluorescent wheel, so that the light emitted by the wavelength conversion device 2 comprises yellow light and blue light, the third light source 11 is not needed, or the brightness of the light with the corresponding color is improved by using the third light source 11. For example, if three areas, such as a green fluorescent area, a red fluorescent area, and a reflective area, are provided on the fluorescent wheel, the light emitted from the wavelength conversion device 2 includes green light, red light, and blue light, and the third light source 11 may not be needed, or the brightness of the corresponding color light is improved by using the third light source 11, and the color filter elements of the two LCD panels may both include r+g+b color filter areas.

It should be understood that, in the embodiment of the present utility model, the colors of the light source light emitted from each light source and the excited light emitted from the wavelength conversion device are not limited, so long as the light incident on the two LCD panels can be combined into white light.

It should be noted that, the corresponding transmission function in the above embodiment may be changed into reflection, and the reflection function is changed into transmission, so that the function implementation of the whole light path is not affected, and the embodiments of the present utility model will not be described in detail.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (15)

1. An optical system, comprising:

a light source device for generating light of a first wavelength;

the polarization splitting element is positioned at the light emitting side of the light source device and is used for polarization splitting of the first wavelength light and splitting the first wavelength light into first polarized light propagating along the first channel and second polarized light propagating along the second channel, wherein the first polarized light has a first polarization state, and the second polarized light has a second polarization state;

the first liquid crystal panel is arranged on the first channel and used for modulating the first polarized light;

the second liquid crystal panel is arranged on the second channel and used for modulating the second polarized light.

2. An optical system according to claim 1, wherein the light source means is further adapted to generate light of a second wavelength of a first polarization state, the first wavelength light and the second wavelength light being synthesizable to white light;

the polarization beam splitting element is further configured to guide light of a second wavelength in the first polarization state to propagate along the first channel;

the first liquid crystal panel is also used for modulating the second wavelength light of the first polarization state.

3. An optical system according to claim 1, wherein the light source device is further configured to generate a third wavelength light of a first polarization state and a fourth wavelength light of a second polarization state, the first, third and fourth wavelength lights being synthesizable into white light;

the polarization beam splitting element is further configured to guide light of a third wavelength in the first polarization state to propagate along the first channel, and guide light of a fourth wavelength in the second polarization state to propagate along the second channel;

the first liquid crystal panel is further used for modulating the third wavelength light of the first polarization state;

the second liquid crystal panel is further configured to modulate light of a fourth wavelength of the second polarization state.

4. An optical system according to claim 1, wherein the first wavelength light is mixed by the fifth wavelength light and the sixth wavelength light.

5. An optical system as recited in claim 1, wherein said first wavelength light comprises green light.

6. An optical system according to claim 2, wherein the first wavelength light comprises two of red light, green light and blue light, and the second wavelength light is one of red light, green light and blue light other than the two light.

7. An optical system according to claim 3, wherein the first wavelength light, the third wavelength light and the fourth wavelength light are different colors of light and are selected from red light, green light and blue light, respectively; or,

the first wavelength light includes two kinds of light of red light, green light, and blue light, the third wavelength light is one kind of light other than the two kinds of light of red light, green light, and blue light, and the fourth wavelength light is one kind of light of the two kinds of light.

8. An optical system as recited in claim 4, wherein the first liquid crystal panel comprises a first color filter element and the second liquid crystal panel comprises a second color filter element, the first color filter element having a first wavelength color filter region and the second color filter element having a fifth wavelength color filter region and a sixth wavelength color filter region.

9. An optical system as recited in claim 6, wherein the first liquid crystal panel comprises a first color filter element, the second liquid crystal panel comprises a second color filter element, the first color filter element has a first color filter region and a second color filter region, the second color filter element has a third color filter region and a fourth color filter region, wherein the first color filter region is for filtering light of a first wavelength, the second color filter region is for filtering light of a second wavelength, the third color filter region is for filtering one of the two lights, and the fourth color filter region is for filtering the other of the two lights.

10. An optical system according to claim 7, wherein the first liquid crystal panel comprises a first color filter element and the second liquid crystal panel comprises a second color filter element;

when the first wavelength light, the third wavelength light and the fourth wavelength light are light of different colors and are respectively selected from red light, green light and blue light, the first color filter element has a first wavelength color filter region and a third wavelength color filter region, and the second color filter element has a first wavelength color filter region and a fourth wavelength color filter region;

when the first wavelength light includes two kinds of light of red light, green light, and blue light, the third wavelength light is one of red light, green light, and blue light other than the two kinds of light, and the fourth wavelength light is one of the two kinds of light, the first color filter element has a first wavelength color filter region and a third wavelength color filter region, and the second color filter element has a first wavelength color filter region and a fourth wavelength color filter region; or,

the first color filter element has a fifth color filter region for filtering light of a first wavelength, a sixth color filter region for filtering light of a third wavelength, a seventh color filter region for filtering one of the two lights, and an eighth color filter region for filtering the other of the two lights.

11. An optical system according to claim 1, wherein the light source means comprises a first light source for generating excitation light and first wavelength conversion means for generating the first wavelength light under irradiation of the excitation light.

12. An optical system according to claim 2, wherein the light source means comprises a second light source, a first light splitting and combining element, a first polarization conversion element and a second wavelength conversion means, wherein,

the second light source is used for generating light with a second wavelength;

the first light splitting and combining element is used for splitting the second wavelength light generated by the second light source into the second wavelength light with the first polarization state and the second wavelength light with the second polarization state, guiding the second wavelength light with the first polarization state to propagate to the second wavelength conversion device, and guiding the second wavelength light with the second polarization state to propagate to the first polarization conversion element;

the first polarization conversion element is used for converting incident second-wavelength light in a second polarization state into second-wavelength light in a first polarization state;

the second wavelength conversion device is used for converting incident second wavelength light with a first polarization state into first wavelength light;

the first light splitting and combining element is further used for guiding the second wavelength light with the first polarization state emitted by the first polarization conversion element and the first wavelength light emitted by the second wavelength conversion device to propagate to the polarization light splitting element.

13. An optical system according to claim 3, wherein the light source means comprises a third light source, a fourth light source and wavelength conversion means, wherein,

the third light source is used for generating excitation light;

the fourth light source is configured to generate third wavelength light of the first polarization state and fourth wavelength light of the second polarization state;

the wavelength conversion device is used for generating the first wavelength light under the irradiation of the excitation light.

14. An optical system according to claim 3, wherein said light source means comprises a fifth light source, a sixth light source, a second light splitting and combining element, a second polarization conversion element and a third wavelength conversion means, wherein,

the fifth light source is used for generating light with a third wavelength;

the second light splitting and combining element is configured to split the third wavelength light generated by the fifth light source into the third wavelength light in the first polarization state and the third wavelength light in the second polarization state, and guide the third wavelength light in the first polarization state to propagate to the third wavelength conversion device, and guide the third wavelength light in the second polarization state to propagate to the second polarization conversion element;

the second polarization conversion element is used for converting incident third-wavelength light in a second polarization state into third-wavelength light in a first polarization state;

the third wavelength conversion device is used for converting incident third wavelength light with a first polarization state into first wavelength light;

the light splitting and combining element is further used for guiding third wavelength light in a first polarization state emitted by the second polarization conversion element and first wavelength light emitted by the third wavelength conversion device to propagate to the polarization light splitting element;

the sixth light source is configured to generate light of a fourth wavelength in the second polarization state.

15. A projection device comprising the optical system of any one of claims 1-14.