CN219958062U - Projection system - Google Patents

Abstract

The utility model discloses a projection system, and relates to the technical field of photoelectricity. According to the utility model, the light path turning element is used for guiding one path of modulated light or multipath modulated light, so that corresponding pixels in a projection picture formed by the one path of modulated light or multipath modulated light deviate from a preset distance, pixel expansion is realized, and the display resolution of a projection system is further improved.

Description

Projection system

Technical Field

The utility model relates to the technical field of photoelectricity, in particular to a projection system.

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) projection, reflective LCoS (Liquid Crystal on Silicon ) projection, and reflective DMD (Digital Micro-Mirror Device) projection. The resolution of the spatial light modulator determines the native resolution of the projection system, and if the native resolution of the spatial light modulator is improved, the cost will be increased, and the conventional method for improving the display resolution is generally to adopt a galvanometer, and offset of the image is realized through repeated vibration of an optical lens, so that the display resolution higher than the native resolution of the spatial light modulator is formed.

Disclosure of Invention

In view of this, the present utility model provides a novel projection system, which can implement pixel expansion, so as to improve the display resolution of the projection system.

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

a light source device for emitting first illumination light and second illumination light;

a first liquid crystal panel for modulating the first illumination light to form first modulated light;

a second liquid crystal panel for modulating the second illumination light to form second modulated light;

the light combining element is used for combining the first modulated light and the second modulated light and then emitting the combined light;

the optical path turning element is used for guiding at least one of the first modulated light and the second modulated light so that pixels in a projection picture formed by the first modulated light deviate from corresponding pixels in a projection picture formed by the second modulated light by a preset distance.

In a possible implementation manner, the optical path turning element is located between the second liquid crystal panel and the light combining element, and the optical path turning element is used for guiding the second modulated light to be incident to the light combining element.

In a possible implementation manner, the optical path turning element is located on the light emitting side of the light combining element, the polarization states of the first modulated light and the second modulated light incident to the optical path turning element are different, and the optical path turning element is used for guiding the first modulated light and the second modulated light to exit from the first direction, but the first modulated light and the second modulated light exiting through the optical path turning element have displacement in a direction perpendicular to the first direction.

In a possible implementation, the optical path turning element includes a birefringent crystal element or an over-structured lens.

In a possible implementation, the first illumination light and the second illumination light are both white light.

In a possible implementation manner, the first liquid crystal panel displays a color field image of first illumination light of the input signal, and the second liquid crystal panel displays a color field image of second illumination light of the input signal at the same time or at an interval allowing time.

In a possible implementation manner, the first illumination light and the second illumination light each include a first light, a second light and a third light, the first liquid crystal panel alternately displays color field images of the first light, the second light and the third light of the input signal, and the second liquid crystal panel alternately displays color field images of the first light, the second light and the third light of the input signal, respectively, where the first light, the second light and the third light may synthesize white light.

In a possible implementation manner, the method further includes:

the polarization conversion element is positioned between the light combining element and the light path turning element, the polarization states of the first modulated light and the second modulated light which are incident to the polarization conversion element are the same, and the polarization conversion element is used for converting the polarization states in a time sequence, so that the combined light of the first modulated light and the second modulated light which are emitted by the light combining element is alternately incident to the light path turning element in a first polarization state and a second polarization state;

the optical path turning element is used for guiding the modulated light of the first polarization state and the second polarization state to exit from the first direction, but the modulated light of the first polarization state and the second polarization state exiting through the optical path turning element has displacement in the direction perpendicular to the first direction.

In a possible implementation, the first illumination light and the second illumination light include light of different wavelength bands, and the first illumination light and the second illumination light may synthesize white light.

In a second aspect, the present utility model provides a projection system comprising:

a light source device for emitting illumination light;

a liquid crystal panel for modulating the illumination light to form modulated light;

an optical path turning element movably disposed in an optical path for guiding the modulated light in time sequence so that the modulated light is alternately emitted from a first position and a second position, wherein a pixel in a projection screen formed by the modulated light emitted from the first position is deviated from a corresponding pixel in a projection screen formed by the modulated light emitted from the second position by a preset distance;

and the driving device is used for driving the light path turning element so that the light path turning element is in a light path in a time sequence.

According to the utility model, the light path turning element is used for guiding one path of modulated light or multipath modulated light, so that corresponding pixels in a projection picture formed by the one path of modulated light or multipath modulated light deviate from a preset distance, pixel expansion is realized, and the display resolution of a projection system is further improved.

Drawings

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

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

FIG. 3 is a schematic diagram of a projection system according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of an optical path turning element according to an embodiment of the present utility model;

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

FIG. 6 is a schematic diagram of a projection system according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a projection system 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 embodiments of the present utility model, "plurality" refers to two or more. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. It is to be understood that the terms "upper," "lower," "inner," "outer," "front," "back," and the like are merely used for convenience in describing the utility model and to simplify the description, and are not to be construed as implying or indicating a limitation on the utility model.

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 diagram of functional modules of a conventional projection system. As shown in fig. 1, the projection system 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 system 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 system, and may run or execute software programs and/or operating systems stored in the memory module 104 and invoke data stored in the memory module 104 using various interfaces and lines to connect various portions of the entire projection system. Alternatively, the image processor 101 and the central controller 103 may be integrated as one processor.

In some embodiments, the projection system 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 system architecture shown in fig. 1 is not limiting of the projection system 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 from use of the projection system, 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 system may also include an input module 105, which input module 105 may be used to receive entered numeric 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 system may also include a communication module 106, and in some embodiments the communication module 106 may include a wireless module, through which the projection system 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 system 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 diagram of a conventional projection system. As shown in fig. 2, the projection system includes a light source device 201, an optical system 202, and an imaging system 203. Wherein the light source device 201 comprises one or more light sources; the 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 optical system 202, and the spatial light modulator irradiates an incident light beam thereof into an imaging system 203, and finally images 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 system may further comprise a light source control module (not shown in the figures) 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 for generating an image. Further, the light source device 201, the optical system 202, and the imaging system 203 may be included in the projection light engine 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, 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 system.

Fig. 3 is a schematic structural diagram of a projection system according to an embodiment of the present utility model. As shown in fig. 3, the projection system includes a light source device 111, a lens assembly 112, an LCD panel 113, a light path turning element 114 and a projection lens 116, wherein the illumination light generated by the light source device 111 is shaped by the lens assembly 112 and then is incident on the LCD panel 113, the LCD panel 113 modulates the illumination light to form modulated light, and the modulated light is guided to the projection lens 116 through the light path turning element 114, so as to finally form a projection picture on a projection screen.

The light source device 111 is configured to emit illumination light, and the illumination light may include a single wavelength band or may include a plurality of different wavelength bands. The light source device 111 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.

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 and has an emission surface for emitting laser light; or may be an LED light source. The light source can be a single red, green and blue LED light source, an LED light source array or a COB light source; but also blue LED sources and yellow sources.

The lens assembly 112 may include one or more lenses for shaping the illumination light. Illustratively, the lens assembly 112 includes a plurality of collimator lenses, and 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 LCD panel 113 is used to modulate illumination light to form modulated light. Since the LCD panel 113 can only pass light of a specific polarization state (e.g., P-state or S-state), the light is modulated to light having a specific polarization state.

The light path turning element 114 may direct light of different polarization states to different locations. As shown in fig. 4, when light of the first polarization state (e.g., P-state) and light of the second polarization state (e.g., S-state) pass through the optical path turning element 114 in the direction X, the light of the first polarization state may directly pass through the optical path turning element 114 and continue to exit along the direction X from the X1 position, the light of the second polarization state passes through the optical path turning element 114 and still exits along the direction X after turning, but the exit directions of the light of the first polarization state and the light of the second polarization state are the same when exiting from the optical path turning element 114, but for the same pixel, the light of the first polarization state and the light of the second polarization state may have a pixel offset in a direction perpendicular to the direction X, and the pixel offset may be a preset offset, for example, may be 1/2 pixel pitch, 1 pixel pitch, etc.

Illustratively, the optical path turning element 114 may include a birefringent crystal element or an over-structured lens. If the optical path turning element 114 includes a birefringent crystal element, when a beam of light passes through the birefringent crystal element, the ordinary ray o-ray will be refracted according to the law of refraction, and for the incident light perpendicular to the plane, the o-ray will exit vertically along a straight line, while the extraordinary ray e-ray does not satisfy the law of refraction, even if the beam is incident perpendicular to the interface, the beam will be deflected, and finally the direction of the emergent light is consistent with that of the incident light, but a displacement caused by the birefringent effect occurs, and the refractive index of the birefringent crystal element can be controlled by the displacement. For another example, the optical path turning element 114 includes a super-structure lens (transmissive super-structure lens or reflective super-structure lens), which may also be referred to as a super-structure lens (metalens), and is made of an optical element focusing light on a super-surface, where the super-surface mainly refers to a two-dimensional metamaterial composed of nano-structures with ultra-thin thickness, and the nano-structures composing the super-surface may be structures such as holes, slits or protrusions, so that the super-structure lens can focus light with different polarization states to different positions, and the pixel offset can be similarly realized by using the principle.

In this embodiment, the optical path turning element 114 is a movable element, and the driving device 115 drives the optical path turning element 114, so that the optical path turning element 114 appears in the optical path in time sequence, for example, the first projection time sequence is not in the optical path, the second projection time sequence is in the optical path, and the driving mode can be moving, swinging, or rotating. For example, assuming that the modulated light emitted from the LCD panel 113 is S light, the light path turning element 114 deflects the S light, at the first projection timing, the modulated light emitted from the LCD panel 113 is not in the light path, and directly enters the projection lens 116, at the second projection timing, the modulated light emitted from the LCD panel 113 is guided by the light path turning element 114 in the light path, and enters the projection lens 116, so that the resolution of the formed image can be doubled compared with that of the original image when the projected images formed at the first projection timing and the second projection timing are superimposed on the projection screen.

Fig. 5 is a schematic structural diagram of another projection system according to an embodiment of the present utility model. As shown in fig. 5, the projection system includes a first light source 1, a first lens 2, a first LCD panel 3, a light path turning element 4, a light combining element 5, a projection lens 6, a second light source 7, a second lens 8 and a second LCD panel 9, wherein the illumination light emitted from the first light source 1 is guided to the first LCD panel 3 through the first lens 2, and is modulated at the first LCD panel 3 to form a first modulated light; the illumination light emitted by the second light source 7 is guided to the second LCD panel 9 through the second lens 8, and is modulated at the second LCD panel 9 to form second modulated light, and the first modulated light is guided to the light combining element 5 through the light path turning element 4 and is incident to the projection lens 6 after being combined with the second modulated light.

In some embodiments, the first illumination light emitted by the first light source 1 and the second illumination light emitted by the second light source 7 are both white light, the first modulated light formed by modulating the first illumination light by the first LCD panel 3 is S-state modulated light, the S-state modulated light is incident to the light combining element 5 after generating a preset offset by the light path turning element 4, and then is projected to the projection screen by the projection lens 6 to form a projection picture, the second modulated light formed by modulating the second illumination light by the second LCD panel 9 is P-state modulated light, and the P-state modulated light is projected to the projection screen in sequence by the light combining element 5 and the projection lens 6 to form a projection picture.

In some embodiments, the first light source 1 and the second light source 7 each include a red light source, a green light source and a blue light source, one projection sequence includes a first sub-sequence, a second sub-sequence and a third sub-sequence, the first sub-sequence lights the blue light source, the blue light emitted from the blue light source in the first light source 1 is modulated by the first LCD panel 3 to form a first blue modulated light, the first blue modulated light is S-state modulated light, the first blue modulated light is guided by the light path turning element 4 to generate deflection and then is incident on the light combining element 5, the blue light emitted from the blue light source in the second light source 7 is projected on the projection screen by the projection lens 6, the second blue modulated light is P-state modulated light, the second blue modulated light is incident on the light combining element 5, the first blue modulated light forms a projection picture, the pixels in the projection picture deviate from the corresponding pixels in the projection picture formed by the second blue modulated light by a preset distance, the second sub-time is used for lighting a green light source, the third sub-time is used for lighting a red light source, and the projection picture formed by green light and red light of the first LCD panel 3 and the second LCD panel 9 has pixel deviation similar to the first sub-time when the blue light source is lighted, when the projection pictures formed by the first LCD panel 3 and the second LCD panel 9 are overlapped on the projection screen, the resolution of the formed picture can be improved by two times compared with the resolution of the original picture, the brightness is enhanced by twice light in a time sequence range, and meanwhile, a color filter element can be omitted, so that the light loss caused by the color filter element is avoided.

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. 6 is a schematic structural diagram of a projection system according to another embodiment of the present utility model. Unlike the embodiment shown in fig. 5, the embodiment shown in fig. 6 only includes one light source, i.e., the first light source 1, and the illumination light emitted from the first light source 1 is split into two paths by the light splitting element 10, one path of the illumination light is incident on the first LCD panel 3, and the other path of the illumination light is incident on the second LCD panel 9.

Further, the light path turning element 4 is located at the light emitting side of the light combining element 5, the first modulated light formed by the first LCD panel 3 is S-state modulated light, the second modulated light formed by the second LCD panel 9 is P-state modulated light, the P-state modulated light does not generate deflection at the light path turning element 4, and the S-state modulated light generates deflection at the light path turning element 4, so that the pixels in the projection picture formed by the first modulated light and the corresponding pixels in the projection picture formed by the second modulated light deviate from a preset distance, and when the projection picture formed by the first modulated light and the second modulated light are superimposed on the projection screen, the resolution of the formed picture can be increased by two times compared with the resolution of the original image.

The rest of the structure of the embodiment shown in fig. 6 is the same as that of the embodiment shown in fig. 5, and will not be described again here.

In some embodiments, the light splitting element 10 is a polarizing beam splitter, the white light (such as the combined light of RGB three primary color light sources or the white light source) generated by the first light source 1 passes through the polarizing beam splitter, the P-polarized light is transmitted to the second LCD panel 9, the S-polarized light is reflected, and the S-polarized light is incident on the first LCD panel 3 after being reflected and adjusted to the light path, wherein the S-polarized light is modulated by the first LCD panel 3 and then is incident on the light path turning element 4 through the light combining element 5, and after being incident on the light path turning element 4, the light path is shifted, so that the image pixels projected after shifting are adjacent to the image pixels projected after being modulated by the second LCD panel 9. Each frame of image data is divided into two sub-image data according to adjacent pixel splitting, the liquid crystal molecular arrangement of the first LCD panel 3 and the second LCD panel 9 is controlled by a driver respectively, and finally the projected images are spliced into images with resolution higher than that of the LCD.

Optionally, the RGB three primary color light sources in the first light source 1 are turned on according to a time sequence, each frame of image data is firstly divided into three sub-image data according to RGB components, respectively, namely R component image data, G component image data and B component image data, each R/B/G component image data is further divided into two sub-image data according to adjacent pixels, and the two sub-image data are respectively controlled by a driver to arrange liquid crystal molecules of the first LCD panel 3 and the second LCD panel 9 when the corresponding primary color light is turned on, so that the projected image is finally spliced into an image with a resolution higher than that of the LCD.

Fig. 7 is a schematic structural diagram of a projection system according to another embodiment of the present utility model. As shown in fig. 7, the projection system includes a first light source 1, a first lens 2, a first LCD panel 3, an optical path turning element 4, a light combining element 5, a projection lens 6, a second light source 7, a second lens 8, a second LCD panel 9, and a polarization conversion element 11, wherein illumination light emitted from the first light source 1 is guided to the first LCD panel 3 through the first lens 2, and modulated at the first LCD panel 3 to form first modulated light; the illumination light emitted by the second light source 7 is guided to the second LCD panel 9 through the second lens 8, the second modulated light is formed after being modulated at the second LCD panel 9, the first modulated light and the second modulated light are combined at the light combining element 5, the polarization state is converted by the polarization conversion element 11, then the illumination light is incident to the light path turning element 4, and finally the illumination light is projected to the projection screen through the projection lens 6.

In this embodiment, the polarization states of the first modulated light formed by the first LCD panel 3 and the second modulated light formed by the second LCD panel 9 are the same, for example, the first modulated light formed by the first LCD panel 3 and the second modulated light formed by the second LCD panel 9 are P-state modulated light, at the first projection time, the polarization conversion element 11 does not change the polarization state of the modulated light, the P-state modulated light is incident to the projection lens along the original light path through the light path turning element 4, at the second projection time, the polarization conversion element converts the P-state modulated light into S-state modulated light, the light path is shifted after the S-state modulated light passes through the light path turning element 4, so that the image pixels projected after shifting generate a preset offset with the image pixels projected at the first projection time, and when the projection images formed by the two are superimposed on the projection screen, the resolution of the formed image can be improved by two times compared with the resolution of the original image.

Further, the first illumination light emitted by the first light source 1 and the second illumination light emitted by the second light source 7 include light in different wavebands, the first illumination light and the second illumination light can be combined into white light, the light combining element 5 can use wavelength light combining, for example, the first light source 1 is used for emitting red light and blue light, the second light source 7 is used for emitting green light, the first light source 1 alternately lights the red light source and the blue light source, the second light source 7 continuously lights the green light source, the red light and the blue light are alternately modulated by the first LCD panel 3, and the green light is continuously modulated by the second LCD panel 9. Wherein, the first LCD panel 3 can be provided with an R color filtering area and a B color filtering area, the second LCD panel 9 can be provided with a G color filtering area, the R color filtering area filters red light, the B color filtering area filters blue light, the G color filtering area filters green light, and the balance of color gamut and brightness is realized. It should be understood that the first illumination light and the second illumination light may also comprise other colors of light, such as the first illumination light comprising red light and green light, the second illumination light comprising blue light, or the first illumination light comprising red light, green light and blue light, the second illumination light comprising green light, etc., as the utility model is not limited in this respect.

It should be noted that, in the case where the LCD panel is provided with color films, the color films may include 1 to 3 color filter areas, for example, one LCD panel includes an RB color filter area, the other LCD panel includes a G color filter area, or one LCD panel includes an RG color filter area, the other LCD panel includes a B color filter area, or one LCD panel includes a BG color filter area, the other LCD panel includes an R color filter area, and the monochrome color film may be a color film or a black-and-white screen; as another example, one LCD panel contains RB color filter regions, and the other LCD panel contains GW color filter regions or GC color filter regions; the three color filter areas on the LCD panel may include RGB, RGG, or CMY, etc.; RGG brightens red and green, W is white, CMY is cyan, magenta and yellow, respectively, and correspondingly brightens blue, red and green.

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 (10)

1. A projection system, comprising:

a light source device for emitting first illumination light and second illumination light;

a first liquid crystal panel for modulating the first illumination light to form first modulated light;

a second liquid crystal panel for modulating the second illumination light to form second modulated light;

the light combining element is used for combining the first modulated light and the second modulated light and then emitting the combined light;

the optical path turning element is used for guiding at least one of the first modulated light and the second modulated light so that pixels in a projection picture formed by the first modulated light deviate from corresponding pixels in a projection picture formed by the second modulated light by a preset distance.

2. The projection system of claim 1, wherein the optical path turning element is located between the second liquid crystal panel and the light combining element, and the optical path turning element is configured to guide the second modulated light to be incident on the light combining element.

3. The projection system of claim 1 wherein the light path turning element is located on the light exit side of the light combining element, the polarization states of the first and second modulated light incident to the light path turning element are different, and the light path turning element is configured to direct the first and second modulated light to exit from the first direction, but the first and second modulated light exiting through the light path turning element have a displacement in a direction perpendicular to the first direction.

4. A projection system according to claim 1, wherein the optical path turning element comprises a birefringent crystal element or a super-structured lens.

5. The projection system of claim 1 wherein the first illumination light and the second illumination light are each white light.

6. The projection system of claim 5 wherein the first liquid crystal panel displays a color field image of a first illumination of the input signal and the second liquid crystal panel displays a color field image of a second illumination of the input signal simultaneously or at intervals allowing time.

7. The projection system of claim 1 wherein the first illumination light and the second illumination light each comprise a first light, a second light, and a third light, the first liquid crystal panel alternately displaying color field images of the first light, the second light, and the third light of the input signal, and the second liquid crystal panel alternately displaying color field images of the first light, the second light, and the third light of the input signal, respectively, wherein the first light, the second light, and the third light are synthesizable to white light.

8. A projection system according to claim 1, further comprising:

the polarization conversion element is positioned between the light combining element and the light path turning element, the polarization states of the first modulated light and the second modulated light which are incident to the polarization conversion element are the same, and the polarization conversion element is used for converting the polarization states in a time sequence, so that the combined light of the first modulated light and the second modulated light which are emitted by the light combining element is alternately incident to the light path turning element in a first polarization state and a second polarization state;

the optical path turning element is used for guiding the modulated light of the first polarization state and the second polarization state to exit from the first direction, but the modulated light of the first polarization state and the second polarization state exiting through the optical path turning element has displacement in the direction perpendicular to the first direction.

9. The projection system of claim 8 wherein the first illumination light and the second illumination light comprise different wavelength bands of light and wherein the first illumination light and the second illumination light are synthesizable to white light.

10. A projection system, comprising:

a light source device for emitting illumination light;

a liquid crystal panel for modulating the illumination light to form modulated light;

an optical path turning element movably disposed in an optical path for guiding the modulated light in time sequence so that the modulated light is alternately emitted from a first position and a second position, wherein a pixel in a projection screen formed by the modulated light emitted from the first position is deviated from a corresponding pixel in a projection screen formed by the modulated light emitted from the second position by a preset distance;

and the driving device is used for driving the light path turning element so that the light path turning element is in a light path in a time sequence.