CN110737101B - Imaging displacement module for improving resolution and manufacturing method thereof - Google Patents

Abstract

An imaging displacement module comprises a first grating and a second grating which can be switched between a diffraction state and a non-diffraction state. The first grating is provided with a first surface and a second surface which correspond to each other, the first surface receives image light, and the image light is emitted from the second surface. The second grating is provided with a third surface and a fourth surface which correspond to each other, the third surface receives the image light, and the image light is emitted from the fourth surface. The incident direction of the image light incident to the first grating and the emergent direction of the image light emergent from the second grating are translated for a distance.

Description

Imaging displacement module for improving resolution and manufacturing method thereof

technical field

The invention relates to an imaging displacement module and a manufacturing method of the imaging displacement module.

Background technique

In recent years, various image display technologies have been widely used in daily life. In the image display device, for example, an imaging displacement module can be set to change the optical path of the light in the device, so as to provide various effects such as increasing the imaging resolution and improving the picture quality. The known imaging displacement module is usually an optical path adjustment mechanism that includes a moving part and a fixed part. The optical path adjustment mechanism causes the optical element to reciprocate to cause a slight displacement of the pixel image, which provides The effect of increasing image resolution. However, the conventional optical path adjustment mechanism tends to generate high-frequency noise when swinging, and the service life of the component material is limited under high-speed vibration, and the light performance is affected by the limitation of the transition time. Furthermore, once the size requirements of passive components (such as light valves) change, it is necessary to redesign and verify the material and structural composition accordingly, making it difficult to simplify the manufacturing process and the overall structure.

The "Background" section is only used to help understand the content of the present invention, so the content disclosed in the "Background" section may include some conventional technologies that do not constitute the knowledge of those with ordinary skill in the art. The content disclosed in the "Background Technology" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention .

Contents of the invention

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the embodiments of the present invention.

The invention provides an imaging displacement module, which includes a first grating and a second grating that can be switched between a diffraction state and a non-diffraction state. The first grating is provided with a corresponding first surface and a second surface, the first surface receives image light, and the image light exits from the second surface. The second grating is located downstream of the optical path of the first grating, and is provided with a corresponding third surface and a fourth surface. The third surface receives image light, and the image light exits from the fourth surface. The incident direction of the image light incident on the first grating and the outgoing direction of the second grating are substantially shifted by a distance in the first direction. Furthermore, the image light forms an incident angle with the normal of the first surface, and the image light forms an exit angle with the normal of the fourth surface, and the incident angle and the exit angle can be substantially the same. When the imaging displacement module switches between the diffraction state and the non-diffraction state in turn, due to the phenomenon of persistence of vision of the human eye, the observer can see twice as many pixels of the image, for example, the effect of increasing the pixel resolution to 2 times .

The present invention further provides an imaging displacement module, which includes a first grating, a second grating, a third grating and a fourth grating that can be switched between a diffraction state and a non-diffraction state. The first grating is provided with a corresponding first surface and a second surface, the first surface receives an image light and the image light exits from the second surface. The second grating is located downstream of the optical path of the first grating, and is provided with a corresponding third surface and a fourth surface. The third surface receives the image light, and the image light is emitted from the fourth surface. The third grating is provided with a corresponding fifth surface and a sixth surface, the fifth surface receives image light, and the image light exits from the sixth surface. The fourth grating is located downstream of the optical path of the third grating, and has corresponding seventh and eighth surfaces. The seventh surface receives image light, and the image light exits from the eighth surface. The incident direction of the image light incident on the first surface and the outgoing direction from the eighth surface are substantially translated by the first distance in the first direction and at the same time are substantially translated by the second distance in the second direction, and the second direction is different from the first direction . With the design of the four gratings switching between the diffractive state and the non-diffractive state, two-dimensional biaxial adjustments can be formed to achieve, for example, an effect of increasing the pixel resolution by 4 times.

The present invention also provides a method for manufacturing an imaging displacement module, including providing a casing; installing a first grating switchable between a diffractive state and a non-diffractive state in the casing; the first grating is provided with a corresponding first surface and a second surface, the first surface receives image light, and the image light is emitted from the second surface; and a second grating switchable between a diffractive state and a non-diffractive state is installed in the housing, and the second grating is located on the side of the first grating Downstream of the optical path, there are corresponding third and fourth surfaces, the third surface receives image light, and the image light exits from the fourth surface, wherein the incident direction of the image light incident on the first grating is the same as that emitted by the second grating The outgoing direction is substantially translated by a distance in the first direction.

The imaging displacement module and the manufacturing method of the imaging displacement module of the present invention use, for example, a diffraction grating composed of a holographic polymer dispersed liquid crystal element as an optical path adjustment element, and the effect of pixel image displacement can be obtained without an actuator, so that it can avoid Problems such as high-speed collision and noise can be improved and the service life of components can be improved. Furthermore, due to the shorter liquid crystal transition time, more light efficiency can be retained. In addition, the structural composition of the diffraction grating as an optical path adjustment element is relatively simple, and the design does not need to be modified as the size of the passive element (such as a light valve) changes.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited, and in conjunction with the accompanying drawings, the detailed description is as follows.

Description of drawings

FIG. 1A and FIG. 1B are schematic diagrams showing gratings made of holographic polymer dispersed liquid crystal elements according to an embodiment of the present invention.

2A and 2B are schematic diagrams of an imaging displacement module according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the effect of pixel image displacement according to an embodiment of the present invention.

4A to 5D show schematic diagrams of an imaging displacement module according to another embodiment of the present invention, wherein FIG. 4A to FIG. 4D are side views of the imaging displacement module, and FIG. 5A to FIG. 5D are images from FIG. 4A to FIG. A top view looking down from the top of the displacement module.

FIG. 6 is a schematic diagram showing the effect of pixel image displacement according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing the effect of pixel image displacement according to another embodiment of the present invention.

FIG. 8 shows a schematic diagram of an imaging displacement module according to an embodiment of the present invention.

FIG. 9 is a schematic diagram showing the effect of pixel image displacement according to another embodiment of the present invention.

FIG. 10 shows a schematic diagram of an imaging displacement module according to another embodiment of the present invention.

FIG. 11 is a schematic diagram of an imaging displacement module applied to an optical system according to an embodiment of the present invention.

FIG. 12 is a schematic diagram of an imaging displacement module applied to an optical system according to another embodiment of the present invention.

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

The disclosure in the following embodiments discloses an imaging displacement module, which can be used in different optical systems (such as display devices, projection devices, etc.) to adjust or change the optical path to provide, for example, improved imaging resolution, improved image quality ( Effects such as eliminating dark areas and softening image edges) are not limited, and the installation position and arrangement of the imaging displacement module in the optical system are not limited at all.

FIG. 1A and FIG. 1B are schematic diagrams showing gratings made of holographic polymer dispersed liquid crystal elements according to an embodiment of the present invention. In one embodiment, a holographic polymer dispersed liquid crystal (Holographic Polymer Dispersed Liquid Crystal; HPDLC) 10 is used as a grating switchable between a diffractive state and a non-diffractive state. As shown in FIG. 1A, when the power supply 22, for example, applies a voltage to the holographic polymer dispersed liquid crystal element 10 to form a non-diffraction state, the refractive index of the liquid crystal 12 and the polymer 14 becomes almost identical, and the image light I can be transmitted without Under the phenomenon of diffraction, it penetrates almost straight without changing the direction of travel. As shown in Figure 1B, if no voltage is applied to the holographic polymer dispersed liquid crystal element 10, the difference in refractive index between the liquid crystal 12 and the polymer 14 produces a light diffraction phenomenon to form a diffraction state, and the image light I will be dispersed by the holographic polymer The liquid crystal element 10 is deflected by an angle θ so that the outgoing direction is different from the incident direction. The above-mentioned switching method is not limited. In another embodiment, the liquid crystal material with negative dielectric anisotropy can be used, and the material of the photosensitive material can be changed to form diffraction when a voltage is applied to the holographic polymer dispersed liquid crystal element 10. state and forms a non-diffracting state when no voltage is applied.

2A and 2B are schematic diagrams of an imaging displacement module according to an embodiment of the present invention. As shown in FIG. 2A and FIG. 2B, the imaging displacement module 110 includes a first grating 112 and a second grating 114, and the first grating 112 and the second grating 114 can be switched between a diffraction state and a non-diffraction state, and For example, the first grating 112 and the second grating 114 can be arranged side by side. The second grating 114 is located downstream of the optical path of the first grating 112 , that is, the image light I first passes through the first grating 112 and then passes through the second grating 114 . The first grating 112 is provided with a corresponding surface 112a and a surface 112b, and the second grating 114 is provided with a corresponding surface 114a and a surface 114b, the surface 112a of the first grating 112 receives an image light I, and the image light I is transmitted from the surface 112b is received by the surface 114a of the second grating 114 after being emitted, and the image light I passing through the surface 114a of the second grating 114 is finally emitted from the surface 114b. In this embodiment, when both the first grating 112 and the second grating 114 are in a non-diffraction state (FIG. 2A), the same image light I can pass through the first grating 112 and a second grating sequentially along a substantially linear direction. 114 and form the pixel image P shown in Figure 3; when both the first grating 112 and the second grating 114 are in the diffraction state (Figure 2B), the image light I can be deflected downward by an angle when passing through the first grating 112 θ, then when the image light I passes through the second grating 114, it can be deflected upward by an angle θ in the opposite direction, so that the outgoing direction of the image light is substantially shifted by a distance DS in a first direction (for example, a vertical direction) compared with the incident direction, forming The pixel image Q shown in FIG. 3 . When the imaging displacement module 110 switches between the diffraction state and the non-diffraction state in turn, due to the persistence of vision of the human eye, the observer can see twice as many pixel images (corresponding to a single pixel forming two pixel images P and Q ) to get the effect of increased resolution (twice the original resolution). Furthermore, in this embodiment, the image light forms an incident angle α with the normal of the surface 112a, and the image light I forms an exit angle θ with the normal of the surface 114b, and the incident angle α and the exit angle θ may be substantially the same.

4A to 5D show schematic diagrams of an imaging displacement module according to another embodiment of the present invention, wherein FIG. 4A to FIG. 4D are side views of the imaging displacement module, and FIG. 5A to FIG. 5D are images from FIG. 4A to FIG. A top view looking down from the top of the displacement module. In this embodiment, the imaging displacement module 120 includes a first grating 122 , a second grating 124 , a third grating 132 and a fourth grating 134 that can switch between a diffractive state and a non-diffractive state. The second grating 124 can be located downstream of the first grating 122 , the third grating 132 can be located downstream of the second grating 122 , the fourth grating 134 can be located downstream of the third grating 132 , and the gratings can be arranged side by side, for example. The first grating 122 and the second grating 124 constitute the first group of translation units, enabling the pixel image to be translated along one dimension, and the third grating 132 and the fourth grating 134 constitute the second group of translation units, enabling the pixel image to be translated along another dimension . Therefore, when the grating arrangement of the second set of translation units is different from that of the first set of translation units, the pixel image can be moved in two dimensions, and the effect of increasing the pixel resolution by 4 times is obtained. 4A to 5D, the first grating 122 is provided with a corresponding surface 122a and a surface 122b, the surface 122a receives the image light I, and the image light I is emitted from the surface 122b, and the second grating 124 is provided with a corresponding surface 124a and a surface 124b, the surface 124a receives the image light I and the image light I exits from the surface 124b, the third grating 132 is provided with a corresponding surface 132a and a surface 132b, the surface 132a receives the image light I and the image light I exits from the surface 132b, The fourth grating 134 is provided with a corresponding surface 134a and a surface 134b, the surface 134a receives the image light I and the image light I is emitted from the surface 134b. In this embodiment, when the first set of translation units (gratings 122, 124) and the second set of translation units (gratings 132, 134) are in a non-diffraction state (FIGS. 4A, 5A), the image light I can be transmitted according to one The substantially linear direction passes through all the gratings in sequence and forms the pixel image P shown in FIG. 4B, 5B), when the image light I passes through the first set of translation units (gratings 122, 124), the outgoing direction of the image light will be substantially translated in a first direction (for example, a vertical direction) compared with the incident direction. distance S1 (as shown in FIG. 4B ), and form the pixel image Q shown in FIG. 6 . When the first group of translation units (gratings 122, 124) are in the non-diffraction state and the second group of translation units (gratings 132, 134) are in the diffraction state (Fig. 4B, 5B), due to the grating arrangement of the second group of translation units The method is different from the grating arrangement of the first group of translation units. When the image light I passes through the second group of translation units (gratings 132, 134), the outgoing direction of the image light will be in another second direction (for example, horizontal) compared to the incident direction. direction) substantially translates a distance S2 (as shown in FIG. 5C ), and forms the pixel image R shown in FIG. 6 . Therefore, if the first set of translation units (gratings 122, 124) and the second set of translation units (gratings 132, 134) are in the diffraction state (FIG. 4D, 5D), the image light I can be simultaneously in the vertical direction and the horizontal direction. Both are substantially translated by a distance (respectively shown in FIGS. 4D and 5D ), and form the pixel image S shown in FIG. 6 . Therefore, the dual-axis adjustment in two dimensions can be formed by two sets of translation units, and the effect of increasing the pixel resolution to 4 times is obtained. Furthermore, in this embodiment, the outgoing angle formed by the image light I and the normal of the surface 124b can be substantially the same as the incident angle formed by the normal of the surface 122a, and the outgoing angle formed by the image light I and the normal of the surface 134b The angle may be substantially the same as the incident angle formed by the normal to the surface 132a. Therefore, in one embodiment, the incident angle formed by the image light I and the normal of the surface 122a may be substantially the same as the outgoing angle formed by the image light I and the normal of the surface 134b.

Furthermore, the grating arrangement of the second group of translation units (gratings 132, 134) and the grating arrangement of the first group of translation units (gratings 122, 124) only need to be different to obtain the dual-axis adjustment effect in two dimensions, Therefore, it is only necessary to adjust different grating arrangements, and a non-right-angled parallelogram image track can be formed as shown in FIG. 7 to meet different optical path adjustment requirements. In addition, the configuration of the first grating 122, the second grating 124, the third grating 132, and the fourth grating 134 only need to obtain the displacement adjustment effect in two dimensions, and the diffraction state switching method, arrangement order and grating arrangement The setting method is not limited at all. For example, in another embodiment, the first grating 122 and the third grating 132 can be in the diffractive state or the non-diffractive state at the same time, and the second grating 124 and the fourth grating 134 can be in the diffractive state at the same time or both in a non-diffractive state. In another embodiment, the first grating 122 and the third grating 132 may have the same first grating arrangement, the second grating 124 and the fourth grating 134 may have the same second grating arrangement, and the first grating arrangement The way is different from the second grating arrangement.

FIG. 8 shows a schematic diagram of an imaging displacement module according to an embodiment of the present invention. As shown in Figure 8, the imaging displacement module 200 includes a projection lens 210, a grating 220 and an optical element 230, the grating 220 can be switched between a diffractive state and a non-diffractive state, the optical element 230 is provided with a reflective surface 230a and is located at the Downstream of the optical path, the projection lens 210 is provided with a lens group composed of a plurality of lenses (such as lenses 212 , 214 , 216 , 218 ), and the grating 220 and the optical element 230 can be located in the lens group of the projection lens 210 . In this embodiment, the lens closest to the reflective surface 230a (for example, based on the linear distance relative to the geometric center of the reflective surface) among the plurality of lenses is the lens 212, and the distance d1 from the grating 220 to the reflective surface 230a is smaller than that closest to the reflective surface The distance d2 from the lens 212 of 230a to the reflective surface 230a (d1<d2). The distance between the grating 220 , the reflective surface 230 a and the lens 212 may be, for example, the linear distance of the respective geometric centers of the grating 220 , the reflective surface 230 a and the lens 214 . When the grating 220 is in the non-diffraction state, the image light I can directly enter the reflective surface 230a, and then be reflected by the reflective surface 230a to form the image light I1; when the grating 220 is in the diffractive state, the image light I will be diffracted by the grating 220 The deflection forms the image light I2. The image light I2 emitted by the grating 220 and the image light I1 reflected by the reflective surface 230a travel in different directions (that is, form different angles with the normal of the reflective surface 230a). In this embodiment, when the grating 220 is placed at the superimposed or adjacent aperture position of the projection lens 210, the image light I1 and the image light I2 can respectively form pixel images P and Q at a distance as shown in FIG. The image displacement module 200 alternately switches between the diffraction state and the non-diffraction state, which can also produce the effect of pixel image displacement. Furthermore, if two gratings (with different grating arrangements) are used at the same time, the effect of increasing the pixel resolution by 4 times by adjusting in two dimensions can be produced as in the foregoing embodiment.

FIG. 10 shows a schematic diagram of an imaging displacement module 250 according to another embodiment of the present invention. As shown in FIG. 10 , the imaging displacement module 250 includes a projection lens 260 and a grating 270 . The grating 270 can be switched between a diffractive state and a non-diffractive state. The projection lens 260 is provided with a lens group composed of a plurality of lenses (such as a first lens 262, a second lens 264, and a third lens 266). in the projection lens 260 . In this embodiment, no other lens is provided between the first lens 262 and the second lens 264, and the grating 270 is arranged on the side of the first lens 262 away from the second lens 264, and the grating 270 can be arranged on the same or adjacent At the position of the aperture 268 of the projection lens 260 . In one embodiment, the distance D1 from the grating 270 to the aperture 268 of the projection lens 260 on the optical axis of the projection lens may be smaller than the distance D2 from the grating 270 to the second lens 264 on the optical axis (D1<D2). The distance between the grating 270 , the aperture 268 and the second lens 264 may be, for example, the linear distance of the respective geometric centers of the grating 270 , the aperture 268 and the second lens 264 . The grating 270 can be, for example, a holographic polymer dispersed liquid crystal element (H-PDLC). When the grating 270 is in a non-diffractive state, the image light I can directly pass through the grating 270 along a substantially straight line to form an image light I1. When the grating 270 is In the diffracted state, the image light I will be diffracted and deflected by the grating 220 to form the image light I2, and the image light I2 and the image light I1 are emitted from the grating 220 in different directions. Therefore, when the imaging displacement module 250 switches between the diffraction state and the non-diffraction state in turn, the pixel PL forms a pixel image PI1 and a pixel image PI2 at a distance from each other through the projection lens 260, so the observer can see twice as many pixels image, gaining the effect of doubling the pixel resolution. Furthermore, if two gratings (with different grating arrangements) are used at the same time, the effect of increasing the pixel resolution by 4 times by adjusting in two dimensions can be produced as in the foregoing embodiment.

FIG. 11 is a schematic diagram of an imaging displacement module applied to an optical system according to an embodiment of the present invention. Referring to FIG. 11 , the optical device 400 includes an illumination system 310 , a light valve 320 , a projection lens 260 and an imaging displacement module 110 . Wherein, the lighting system 310 has a light source 312 adapted to provide a light beam 314 , and a light valve 320 is arranged on a transmission path of the light beam 314 . The light valve 320 is adapted to convert the light beam 314 into a plurality of sub-images 314a. In addition, the projection lens 260 is disposed on the transmission path of the sub-images 314 a, and the light valve 320 is located between the illumination system 310 and the projection lens 260 . In addition, the imaging displacement module 110 can be configured between the light valve 320 and the projection lens 260 or in the projection lens 260, for example, it can be between the light valve 320 and the internal total reflection prism 319 or can be between the internal total reflection prism 319 and the projection lens 260 between and on the delivery path of these sub-images 314a. In the above-mentioned optical device 400, the light source 312 may include, for example, a red light-emitting diode 312R, a green light-emitting diode 312G, and a blue light-emitting diode 312B, and the colored light emitted by each light-emitting diode is combined by the light combining device 316. After the light is turned into a beam 314 , the beam 314 will pass through a fly-eye lens array (fly-eye lens array) 317 , an optical element group 318 and an internal total reflection prism (TIR Prism) 319 in sequence. After that, the internal total reflection prism 319 will reflect the light beam 314 to the light valve 320 . At this time, the light valve 320 will convert the light beam 314 into a plurality of sub-images 314a, and these sub-images 314a will sequentially pass through the internal total reflection prism 319 and the imaging displacement module 110, and project these sub-images 314a on the projection lens 260. screen 350 on. In this embodiment, when the sub-images 314a pass through the imaging displacement module 210, the imaging displacement module 110 will change the transmission path of some of the sub-images 314a. That is to say, these sub-images 314a passing through the imaging displacement module 110 will be projected on the first position (not shown) on the screen 350, and these sub-images 314a passing through the imaging displacement module 210 in another part of the time It will be projected at a second position (not shown) on the screen 350 , wherein the first position and the second position differ by a fixed distance in the horizontal direction (X axis) or/and vertical direction (Z axis). In this embodiment, since the imaging displacement module 110 can move the imaging positions of the sub-images 314a by a fixed distance in the horizontal direction or/and vertical direction, the horizontal resolution or/and vertical resolution of the image can be improved. Certainly, the above-mentioned embodiment is only an example, and the imaging displacement module of the embodiment of the present invention can be applied to different optical systems to obtain different effects, and the installation position and arrangement of the imaging displacement module in the optical system are not limited at all. For example, as shown in FIG. 12 , a grating 220 switchable between a diffractive state and a non-diffractive state may also be provided in the projection lens 210 of the optical device 410 .

Furthermore, an embodiment of the present invention provides a method for manufacturing an imaging displacement module, which includes the following steps. First, a casing is provided and a first grating switchable between a diffractive state and a non-diffractive state and a second grating switchable between a diffractive state and a non-diffractive state are installed in the casing. The first grating is provided with a corresponding first surface and a second surface, the first surface receives an image light, and the image light exits from the second surface. The second grating is located downstream of the optical path of the first grating and has a corresponding third surface and a fourth surface, the third surface receives image light, and the image light exits from the fourth surface. The incident direction of the image light incident on the first grating and the outgoing direction of the second grating are substantially shifted by a distance in the first direction. Another embodiment of the present invention provides a method for manufacturing an imaging displacement module, which includes the following steps. Firstly, a lens barrel is provided, and a first lens and a second lens are installed in the lens barrel, and a grating switchable between a diffractive state and a non-diffractive state and an optical element with a reflective surface are installed in the lens barrel. The first lens is closer to the reflective surface than the second lens, and the distance from the first grating to the reflective surface on the optical axis of the first lens is smaller than the distance from the first lens to the reflective surface on the optical axis of the first lens.

With the design of each of the above-mentioned embodiments, for example, the diffraction grating composed of holographic polymer-dispersed liquid crystal elements is used as the optical path adjustment element, and the effect of pixel image displacement can be obtained without actuators, so problems such as high-speed collision and noise can be avoided And can improve the service life of components. Furthermore, due to the shorter liquid crystal transition time, more light efficiency can be retained. In addition, the structural composition of the diffraction grating as an optical path adjustment element is relatively simple, and the design does not need to be modified as the size of the passive element (such as a light valve) changes.

The term "optical element" in the present invention refers to an element composed of a material having light reflection properties, usually consisting of glass or plastic. For example, the optical element may be a reflective mirror, a total reflection prism (TIRPrism), an inverse total reflection prism group (RTIR Prism) and the like.

The term "light valve" in the present invention is mostly used in the industry to refer to some independent optical units in a spatial light modulator (Spatial Light Modulator, SLM). The so-called spatial light modulator contains many independent units (independent optical units), and these independent units are spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical or electrical signals, using various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, self-electro-optic effect or photorefractive effect of semiconductors) etc.) to change its own optical characteristics, thereby modulating the illumination beams illuminating multiple independent units, and outputting image beams. Individual units can be optical elements such as micromirrors or liquid crystal cells. That is, the light valve may be a digital micromirror device (Digital Micro-mirror Device, DMD), a liquid-crystal-on-silicon panel (LCOS Panel), or a transmissive liquid crystal panel.

A projector is a device that uses optical projection to project an image onto a screen. In the projector industry, projectors are generally divided into cathode ray tube (Cathode Ray Tube) projectors, Liquid Crystal Display (LCD) type projectors, Digital Light Projectors (Digital Light Projector, DLP) and Liquid Crystal on Silicon (Liquid Crystal on Silicon, LCOS) projectors will pass through the LCD panel as light when the projector is in operation. Valve, so it belongs to the transmissive projector, and the projector using LCOS, DLP and other light valves, it is based on the principle of light reflection, so it is called a reflective projector. In this embodiment, the projector is a digital light projector, and the light valve 320 is a digital micromirror device (DMD).

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the method and technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the content of the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims (9)

1. An imaging displacement module for improving resolution, comprising: A first grating switchable between a diffraction state and a non-diffraction state is provided with a corresponding first surface and a second surface, the first surface receives an image light, and the image light is transmitted from the second surface exit; and A second grating switchable between a diffractive state and a non-diffractive state, located downstream of the optical path of the first grating, with a corresponding third surface and a fourth surface, the third surface receives the image light, and the image light is emitted from the fourth surface, wherein the incident direction of the image light incident on the first grating and the outgoing direction of the second grating are substantially shifted in a first direction by a distance; Wherein, after the image light passes through the first grating of the imaging displacement module for improving resolution, it can be deflected downward by a first angle, and the image light passes through the imaging displacement module for improving resolution After displacing the second grating of the module, the first angle can be deflected upward in the opposite direction to improve pixel resolution. 2. The imaging displacement module for improving resolution according to claim 1, wherein the image light forms an incident angle with the normal of the first surface, and the image light and the fourth surface The normal forms an exit angle, and the incident angle is substantially the same as the exit angle. 3. The imaging displacement module for improving resolution according to claim 1, wherein the first grating and the second grating are arranged side by side, and the first grating and the second grating are simultaneously Diffraction state or non-diffraction state at the same time. 4. The imaging displacement module for improving resolution as claimed in claim 1, wherein when the first grating and the second grating are both in a non-diffraction state, the image light is along a substantially linear direction Through the first grating and the second grating, when both the first grating and the second grating are in a diffraction state, the first grating and the second grating deflect the image light in opposite directions . 5. An imaging displacement module for improving resolution, comprising: A first grating switchable between a diffractive state and a non-diffractive state is provided with a corresponding first surface and a second surface, the first surface receives an image light, and the image light is transmitted from the first two-surface emission; A second grating switchable between a diffractive state and a non-diffractive state, located downstream of the optical path of the first grating, with a corresponding third surface and a fourth surface, the third surface receives the image light, the image light is emitted from the fourth surface; A third grating switchable between a diffraction state and a non-diffraction state is provided with a corresponding fifth surface and a sixth surface, the fifth surface receives the image light, and the image light comes from the the sixth surface exits; and A fourth grating switchable between a diffractive state and a non-diffractive state, located downstream of the optical path of the third grating, with a corresponding seventh surface and an eighth surface, the seventh surface receives the image light, the image light is emitted from the eighth surface, Wherein, the incident direction of the image light incident on the first surface of the imaging displacement module for improving the resolution is different from the direction of the light emitted from the eighth surface of the imaging displacement module for improving the resolution. In the emitting direction, a first distance is substantially translated in a first direction and a second distance is substantially translated in a second direction at the same time, and the second direction is different from the first direction, so as to improve pixel resolution. 6. The imaging displacement module for improving resolution as claimed in claim 5, wherein the image light forms an incident angle with the normal of the first surface, and the image light and the eighth surface The normal forms an exit angle, and the incident angle is substantially the same as the exit angle. 7. The imaging displacement module for improving resolution according to claim 5, wherein the first grating and the second grating are in a diffractive state or in a non-diffractive state at the same time, and the third grating The grating and the fourth grating are in a diffractive state or in a non-diffractive state at the same time. 8. The imaging displacement module for improving resolution as claimed in claim 5, wherein said first grating and said second grating have the same first grating arrangement, said third grating and said The fourth grating has the same second grating arrangement, and the first grating arrangement is different from the second grating arrangement. 9. The imaging displacement module for improving resolution according to any one of claims 1 to 8, wherein each of the gratings is a holographic polymer dispersed liquid crystal element.

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