A splicing projection device and method based on reflective liquid crystal image modulator

Abstract

A splicing projection device and method based on a reflective liquid crystal image modulator. In the splicing projection device based on the reflective liquid crystal image modulator, four parallel image lights modulated by the first to fourth LCOS chips are formed through the optical path design of one or two light sources, one or two ordinary beam splitting prisms, first to second polarization beam splitting prisms, first to fourth LCOS chips and imaging lenses, and are spliced ​​into a whole image on a projection surface. Compared with the prior art, the optical path design of the splicing projection device avoids the problem of adding reflectors during the splicing process, can realize parallel image splicing of four chips, and simplifies the optical path structure. At the same time, it can also avoid introducing more plane surface errors, and brings great convenience to image splicing adjustment.

Description

Technical Field

[0001] The invention relates to projection technology, and in particular to a splicing projection device and method based on a reflective liquid crystal image modulator (LCOS chip). Background Art

[0002] As an important image modulation device, LCOS chips are widely used in projectors and exposure machines. In order to obtain higher resolution, patent application 201810195760.0 discloses a large field of view splicing exposure machine, which uses spatial light manipulation of the modulation chip to achieve field of view splicing of 4 LCOS chips. However, due to the large number of optical devices used in the exposure machine, each sub-pattern undergoes two plane reflections, which introduces more plane surface errors on the one hand, and on the other hand, a total of 6 reflection surfaces bring great difficulties to the splicing adjustment of the pattern.

[0003] It should be noted that the information disclosed in the above background technology section is only used for understanding the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0004] The main purpose of the present invention is to overcome the defects of the above-mentioned background technology and provide a splicing projection device and method based on a reflective liquid crystal image modulator.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A splicing projection device based on a reflective liquid crystal image modulator comprises a light source, first to second ordinary beam splitting prisms, first to second polarization beam splitting prisms, first to fourth LCOS chips and an imaging lens;

[0007] Wherein, the light emitted by the light source is divided into first and second beams of light after passing through the first common beam splitter prism;

[0008] wherein, after passing through the first polarization beam splitter prism, the first light beam forms a P polarized light for transmission and an S polarized light for reflection; the first LCOS chip modulates a part of the P polarized light into S polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the P polarized light as P polarized light and reflects the light back to the first polarization beam splitter prism; the second LCOS chip modulates a part of the S polarized light into P polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the S polarized light as S polarized light and reflects the light back to the first polarization beam splitter prism; the positions of the first LCOS chip and the second LCOS chip relative to the first polarization beam splitter prism enable the S polarized light reflected from the first LCOS chip and the P polarized light reflected from the second LCOS chip to be converted into the first and second parallel image lights respectively through the first polarization beam splitter prism;

[0009] wherein, after passing through the second polarization beam splitter prism, the second light beam forms a P polarized light for transmission and an S polarized light for reflection; the third LCOS chip modulates a portion of the P polarized light into S polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the P polarized light as P polarized light and reflects the light back to the second polarization beam splitter prism; the fourth LCOS chip modulates a portion of the S polarized light into P polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the S polarized light as S polarized light and reflects the light back to the second polarization beam splitter prism; and the positions of the third LCOS chip and the fourth LCOS chip relative to the second polarization beam splitter prism enable the S polarized light reflected from the third LCOS chip and the P polarized light reflected from the fourth LCOS chip to be converted into third and fourth parallel image lights respectively through the second polarization beam splitter prism;

[0010] The first and second parallel image lights are transmitted and propagated through the second ordinary dichroic prism, and the third and fourth parallel image lights are reflected and propagated through the second ordinary dichroic prism to form four parallel image lights. After passing through the imaging lens, a whole image composed of four parallel images is formed on the projection surface.

[0011] Further:

[0012] The four parallel images are arranged in a 2×2 array, and there is no pixel overlap between the four parallel images.

[0013] The four parallel images are arranged in a 2×2 array, and there is pixel overlap between the four parallel images. There is a seam overlap area on the projection surface, wherein there is a seam overlap area between any two adjacent parallel images, and there is a common seam overlap area for the four parallel images at the center.

[0014] Except for the common overlapping area of ​​the four parallel images, the overlapping area between two adjacent parallel images is displayed at 50% of the normal brightness of each image; the common overlapping area of ​​the four parallel images is displayed at one-quarter of the normal brightness of each image.

[0015] For multi-layer exposure of 3D printing applications, corresponding to the exposure of different layers, parallel images are displayed in a rotation mode at the overlapping area of ​​the seams so that each layer maintains normal brightness in the overlapping area of ​​the seams.

[0016] A splicing projection device based on a reflective liquid crystal image modulator includes first to second light sources, a common beam splitter prism, first to second polarization beam splitter prisms, first to fourth LCOS chips and an imaging lens;

[0017] Wherein, the first to second light sources emit first and second beams of light respectively;

[0018] wherein, after passing through the first polarization beam splitter prism, the first light beam forms a P polarized light for transmission and an S polarized light for reflection; the first LCOS chip modulates a part of the P polarized light into S polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the P polarized light as P polarized light and reflects the light back to the first polarization beam splitter prism; the second LCOS chip modulates a part of the S polarized light into P polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the S polarized light as S polarized light and reflects the light back to the first polarization beam splitter prism; the positions of the first LCOS chip and the second LCOS chip relative to the first polarization beam splitter prism enable the S polarized light reflected from the first LCOS chip and the P polarized light reflected from the second LCOS chip to be converted into the first and second parallel image lights respectively through the first polarization beam splitter prism;

[0019] wherein, after passing through the second polarization beam splitter prism, the second light beam forms a P polarized light for transmission and an S polarized light for reflection; the third LCOS chip modulates a portion of the P polarized light into S polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the P polarized light as P polarized light and reflects the light back to the second polarization beam splitter prism; the fourth LCOS chip modulates a portion of the S polarized light into P polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the S polarized light as S polarized light and reflects the light back to the second polarization beam splitter prism; and the positions of the third LCOS chip and the fourth LCOS chip relative to the second polarization beam splitter prism enable the S polarized light reflected from the third LCOS chip and the P polarized light reflected from the fourth LCOS chip to be converted into third and fourth parallel image lights respectively through the second polarization beam splitter prism;

[0020] The first and second parallel image lights are transmitted and propagated through the common dichroic prism, and the third and fourth parallel image lights are reflected and propagated through the common dichroic prism to form four parallel image lights. After passing through the imaging lens, a whole image composed of four parallel images is formed on the projection surface.

[0021] Further:

[0022] The four parallel images are arranged in a 2×2 array, and there is no pixel overlap between the four parallel images.

[0023] The four parallel images are arranged in a 2×2 array, and there is pixel overlap between the four parallel images. There is a seam overlap area on the projection surface, wherein there is a seam overlap area between any two adjacent parallel images, and there is a common seam overlap area for the four parallel images at the center.

[0024] Except for the common overlapping area of ​​the four parallel images, the overlapping area between two adjacent parallel images is displayed at 50% of the normal brightness of each image; the common overlapping area of ​​the four parallel images is displayed at one-quarter of the normal brightness of each image.

[0025] For multi-layer exposure of 3D printing applications, corresponding to the exposure of different layers, parallel images are displayed in a rotation mode at the overlapping area of ​​the seams so that each layer maintains normal brightness in the overlapping area of ​​the seams.

[0026] A field of view splicing projection method based on a reflective liquid crystal image modulator uses the device to perform field of view splicing projection.

[0027] The present invention has the following beneficial effects:

[0028] The present invention provides a splicing projection device based on a reflective liquid crystal image modulator, wherein four parallel image lights modulated by the first to fourth LCOS chips are formed through the optical path design of a light source, a common beam splitter prism, first to second polarized beam splitter prisms, first to fourth LCOS chips and an imaging lens, and are spliced ​​into a whole image on a projection surface. Compared with the prior art, the optical path design of the splicing projection device avoids the need to add a reflector during the splicing process, can realize parallel image splicing of four chips, simplifies the optical path structure, and can also avoid introducing more plane surface errors, and brings great convenience to image splicing adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the optical path structure of a splicing projection device based on a reflective liquid crystal image modulator according to an embodiment of the present invention.

[0030] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a splicing projection device based on a reflective liquid crystal image modulator according to an embodiment of the present invention.

[0031] Figure 3 The present invention is a schematic diagram of stitching four parallel images without overlap generated by a splicing projection device based on a reflective liquid crystal image modulator according to an embodiment of the present invention.

[0032] Figure 4 The present invention is a schematic diagram of stitching four parallel images with overlapping seams generated by a splicing projection device based on a reflective liquid crystal image modulator according to an embodiment of the present invention.

[0033] Figure 5 The figure is a schematic diagram of the optical path structure of a splicing projection device based on a reflective liquid crystal image modulator according to another embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing as well as for coupling or communication.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] See also Figure 1 to Figure 2 , an embodiment of the present invention provides a splicing projection device based on a reflective liquid crystal image modulator, including a light source S, first to second ordinary beam splitting prisms N1, N2, first to second polarization beam splitting prisms P1, P2, first to fourth LCOS chips L1, L2, L3, L4 and an imaging lens I;

[0039] Wherein, the light emitted by the light source S is divided into first and second beams of light after passing through the first ordinary beam splitter prism P1;

[0040] Wherein, after passing through the first polarization beam splitter prism P1, the first light beam forms a transmitted P polarized light and a reflected S polarized light; the first LCOS chip L1 modulates a part of the P polarized light into S polarized light and reflects the light back to the first polarization beam splitter prism P1, and keeps another part of the P polarized light as P polarized light and reflects the light back to the first polarization beam splitter prism P1; the second LCOS chip L2 modulates a part of the S polarized light into P polarized light and reflects the light back to the first polarization beam splitter prism P1, and keeps another part of the S polarized light as S polarized light and reflects the light back to the first polarization beam splitter prism P1; the positions of the first LCOS chip L1 and the second LCOS chip L2 relative to the first polarization beam splitter prism P1 enable the S polarized light reflected by the first LCOS chip L1 and the P polarized light reflected by the second LCOS chip L2 to be converted into the first and second parallel image lights respectively through the first polarization beam splitter prism P1;

[0041] Wherein, after passing through the second polarization beam splitter prism P2, the second light beam forms a P polarized light for transmission and an S polarized light for reflection. The third LCOS chip L3 modulates a part of the P polarized light into S polarized light and reflects it back to the second polarization beam splitter prism P2, and keeps another part of the P polarized light as P polarized light and reflects it back to the second polarization beam splitter prism P2. The fourth LCOS chip L4 modulates a part of the S polarized light into P polarized light and reflects it back to the second polarization beam splitter prism P2, and keeps another part of the S polarized light as S polarized light and reflects it back to the second polarization beam splitter prism P2. The positions of the third LCOS chip L3 and the fourth LCOS chip L4 relative to the second polarization beam splitter prism P2 enable the S polarized light reflected by the third LCOS chip L3 and the P polarized light reflected by the fourth LCOS chip L4 to be converted into third and fourth parallel image lights respectively through the second polarization beam splitter prism P2.

[0042] Among them, the first and second parallel image lights are transmitted and propagated through the second ordinary beam splitter prism N2, and the third and fourth parallel image lights are reflected and propagated through the second ordinary beam splitter prism N2 to form four parallel image lights. After passing through the imaging lens I, a whole image composed of four parallel images is formed on the projection surface F.

[0043] It can be understood that when the first to fourth LCOS chips L1, L2, L3, and L4 receive P-polarized light or S-polarized light for modulation, a part of the pixels on the first to fourth LCOS chips reflect back P-polarized light, while another part of the pixels reflect back S-polarized light.

[0044] In some embodiments, the first to fourth LCOS chips may use the same LCOS chip. The image signals input to each chip are controlled so that the second LCOS chip L2 and the first LCOS chip L1 are displayed in reverse colors; the fourth LCOS chip L4 and the third LCOS chip L3 are displayed in reverse colors; the first LCOS chip L1 and the fourth LCOS chip L4 are displayed in the same color; and the second LCOS chip L2 and the third LCOS chip L3 are displayed in the same color.

[0045] In some other embodiments, the first to fourth LCOS chips may also use LCOS chips with different color displays, wherein the first LCOS chip L1 and the second LCOS chip L2 are inverted color display chips; the third LCOS chip L3 and the fourth LCOS chip L4 are inverted color display chips; the first LCOS chip L1 and the fourth LCOS chip L4 are the same color display chips; the second LCOS chip L2 and the third LCOS chip L3 are the same color display chips. In this case, the image signals input to the four chips may be the same color image signals.

[0046] In a specific embodiment, the light source is preferably a uniform light source, which can be a fly-eye lens uniform light source or a light guide rod (integrating rod) uniform light source, or other uniform light sources.

[0047] like Figure 3 As shown, in some embodiments, the four parallel images are arranged in a 2×2 array, and there is no pixel overlap between the four parallel images.

[0048] like Figure 4 As shown, in other embodiments, the four parallel images form a 2×2 array arrangement, and there is pixel overlap between the four parallel images, and there is a seam overlap area on the projection surface, wherein there is a seam overlap area between any two adjacent parallel images, and there is a common seam overlap area for the four parallel images at the center.

[0049] In a preferred embodiment, except for the common stitching overlap area of ​​four parallel images, the stitching overlap area between two adjacent parallel images is displayed at 50% of the normal brightness of each image; the common stitching overlap area of ​​four parallel images is displayed at one-fourth of the normal brightness of each image.

[0050] Specifically, for the overlapping area of ​​the seam of two parallel images, the grayscale values ​​of the two parallel images in this area can be changed and calculated to control the brightness of the two parallel images in this area to be reduced by half respectively; for the overlapping area of ​​the seam common to four parallel images, the grayscale values ​​of the four parallel images in this area can be changed and calculated to control the brightness of the four parallel images in this area to be reduced to one quarter of the original.

[0051] In a preferred embodiment, for multi-layer exposure of 3D printing applications, corresponding to the exposure of different layers, parallel images are displayed in a rotation mode at the seam overlap area so that each layer maintains normal brightness in the seam overlap area.

[0052] For multi-layer exposure scenarios such as 3D printing applications, a rotation exposure method is used for the overlapping areas of the stitching. Area 1, area 2, area 3, and area 4 are the display areas of the first LCOS chip L1, the second LCOS chip L2, the third LCOS chip, and the fourth LCOS chip, respectively. Area 12, area 14, area 23, area 34, and area 0 are the stitching areas of the four chip display areas. When exposing different layers, the overlapping area of ​​the seam is operated in rotation, that is, when the first LCOS chip L1 is fully projected, the first LCOS chip L1 displays the area 12, 14, and 0, the second LCOS chip L2, the third LCOS chip L3, and the fourth LCOS chip L4 do not display the area, the second LCOS chip L2 displays the area 23, the third LCOS chip L3 does not display the area 23, the third LCOS chip L3 displays the area 34, and the fourth LCOS chip L4 does not display the area 34; in the next image, the second LCOS chip L2 displays the full image, the third LCOS chip L3, the fourth LCOS chip L4, and the first LCOS chip L1 do not display the area 23, 12, and 0, the third LCOS chip displays the area 34, the fourth LCOS chip does not display the area 34, the fourth LCOS chip displays the area 14, and the first LCOS chip L1 does not display the area 14, and so on. Other rotation methods can also be used to ensure that the display of each layer in the overlapping area of ​​the seam can maintain the required brightness.

[0053] See also Figure 5 The present invention also provides another embodiment of a splicing projection device based on a reflective liquid crystal image modulator, Figure 1 and Figure 2 The difference between the splicing projection device of the illustrated embodiment is that the previous embodiment uses only one light source, but uses two ordinary beam splitters, wherein the light of the light source is split into a first beam of light and a second beam of light by the first ordinary beam splitter N1; while the present embodiment includes a first light source S1 and a second light source S2, which directly emit the first beam of light and the second beam of light, and only uses one ordinary beam splitter N. The present embodiment uses two light sources to illuminate the chips corresponding to the first polarization beam splitter P1 and the second polarization beam splitter P2, respectively. The advantage of separate illumination is that the first light source is only used for illuminating the first LCOS chip and the second LCOS chip, and the second light source is only used for illuminating the third LCOS chip and the fourth LCOS chip, thereby avoiding the loss of the part of light separated from the first ordinary beam splitter prism and irradiated to the second polarization beam splitter P2 but not irradiated to the third LCOS chip and the fourth LCOS chip, and the loss of the part of light separated from the first ordinary beam splitter prism and irradiated to the first polarization beam splitter P1 but not irradiated to the first LCOS chip and the second LCOS chip in the previous embodiment using two ordinary beam splitters.

[0054] In the splicing projection device based on the reflective liquid crystal image modulator provided in the embodiment of the present invention, four parallel image lights modulated by the first to fourth LCOS chips are formed through the optical path design of one or two light sources, one or two ordinary beam splitting prisms, first to second polarization beam splitting prisms, first to fourth LCOS chips and imaging lenses, and are stitched together into a whole image on the projection surface. Compared with the prior art, the optical path design of the splicing projection device avoids the problem of adding reflectors during the splicing process, can realize parallel image splicing of four chips, and simplifies the optical path structure. At the same time, it can also avoid introducing more plane surface errors, and brings great convenience to image splicing adjustment.

[0055] The background section of the present invention may contain background information about the problem or environment of the present invention, but does not necessarily describe the prior art. Therefore, the content included in the background section is not an admission by the applicant that the prior art is available.

[0056] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A splicing projection device based on a reflective liquid crystal image modulator, characterized in that: It includes a light source, first to second ordinary beam splitting prisms, first to second polarization beam splitting prisms, first to fourth LCOS chips and an imaging lens; Wherein, the light emitted by the light source is divided into first and second beams of light after passing through the first common beam splitter prism; wherein, after passing through the first polarization beam splitter prism, the first light beam forms a P polarized light for transmission and an S polarized light for reflection; the first LCOS chip modulates a part of the P polarized light into S polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the P polarized light as P polarized light and reflects the light back to the first polarization beam splitter prism; the second LCOS chip modulates a part of the S polarized light into P polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the S polarized light as S polarized light and reflects the light back to the first polarization beam splitter prism; the positions of the first LCOS chip and the second LCOS chip relative to the first polarization beam splitter prism enable the S polarized light reflected from the first LCOS chip and the P polarized light reflected from the second LCOS chip to be converted into the first and second parallel image lights respectively through the first polarization beam splitter prism; wherein, after passing through the second polarization beam splitter prism, the second light beam forms a P polarized light for transmission and an S polarized light for reflection; the third LCOS chip modulates a portion of the P polarized light into S polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the P polarized light as P polarized light and reflects the light back to the second polarization beam splitter prism; the fourth LCOS chip modulates a portion of the S polarized light into P polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the S polarized light as S polarized light and reflects the light back to the second polarization beam splitter prism; and the positions of the third LCOS chip and the fourth LCOS chip relative to the second polarization beam splitter prism enable the S polarized light reflected from the third LCOS chip and the P polarized light reflected from the fourth LCOS chip to be converted into third and fourth parallel image lights respectively through the second polarization beam splitter prism; The first and second parallel image lights are transmitted and propagated through the second ordinary dichroic prism, and the third and fourth parallel image lights are reflected and propagated through the second ordinary dichroic prism to form four parallel image lights. After passing through the imaging lens, a whole image composed of four parallel images is formed on the projection surface.

2. The splicing projection device based on a reflective liquid crystal image modulator according to claim 1, characterized in that: The four parallel images are arranged in a 2×2 array, and there is no pixel overlap between the four parallel images.

3. The splicing projection device based on a reflective liquid crystal image modulator according to claim 1, characterized in that: The four parallel images are arranged in a 2×2 array, and there is pixel overlap between the four parallel images. There is a seam overlap area on the projection surface, wherein there is a seam overlap area between any two adjacent parallel images, and there is a common seam overlap area for the four parallel images at the center.

4. The splicing projection device based on a reflective liquid crystal image modulator according to claim 3, characterized in that: Except for the common overlapping area of ​​the four parallel images, the overlapping area of ​​the seam between two adjacent parallel images is displayed at 50% of the normal brightness of each image; the common overlapping area of ​​the four parallel images is displayed at one-quarter of the normal brightness of each image.

5. The splicing projection device based on a reflective liquid crystal image modulator according to claim 3, characterized in that: For multi-layer exposure of 3D printing applications, corresponding to the exposure of different layers, parallel images are displayed in the overlapping area of ​​the seams in a rotating manner so that each layer maintains normal brightness in the overlapping area of ​​the seams.

6. A splicing projection device based on a reflective liquid crystal image modulator, characterized in that: It includes first to second light sources, a common beam splitter prism, first to second polarization beam splitter prisms, first to fourth LCOS chips and an imaging lens; Wherein, the first to second light sources emit first and second beams of light respectively; wherein, after passing through the first polarization beam splitter prism, the first light beam forms a P polarized light for transmission and an S polarized light for reflection; the first LCOS chip modulates a part of the P polarized light into S polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the P polarized light as P polarized light and reflects the light back to the first polarization beam splitter prism; the second LCOS chip modulates a part of the S polarized light into P polarized light and reflects the light back to the first polarization beam splitter prism, and keeps another part of the S polarized light as S polarized light and reflects the light back to the first polarization beam splitter prism; the positions of the first LCOS chip and the second LCOS chip relative to the first polarization beam splitter prism enable the S polarized light reflected from the first LCOS chip and the P polarized light reflected from the second LCOS chip to be converted into the first and second parallel image lights respectively through the first polarization beam splitter prism; wherein, after passing through the second polarization beam splitter prism, the second light beam forms a P polarized light for transmission and an S polarized light for reflection; the third LCOS chip modulates a portion of the P polarized light into S polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the P polarized light as P polarized light and reflects the light back to the second polarization beam splitter prism; the fourth LCOS chip modulates a portion of the S polarized light into P polarized light and reflects the light back to the second polarization beam splitter prism, and keeps another portion of the S polarized light as S polarized light and reflects the light back to the second polarization beam splitter prism; and the positions of the third LCOS chip and the fourth LCOS chip relative to the second polarization beam splitter prism enable the S polarized light reflected from the third LCOS chip and the P polarized light reflected from the fourth LCOS chip to be converted into third and fourth parallel image lights respectively through the second polarization beam splitter prism; The first and second parallel image lights are transmitted and propagated through the common dichroic prism, and the third and fourth parallel image lights are reflected and propagated through the common dichroic prism to form four parallel image lights. After passing through the imaging lens, a whole image composed of four parallel images is formed on the projection surface.

7. The splicing projection device based on a reflective liquid crystal image modulator according to claim 6, characterized in that: The four parallel images are arranged in a 2×2 array, and there is no pixel overlap between the four parallel images; Alternatively, the four parallel images are arranged in a 2×2 array, and there is pixel overlap between the four parallel images, and there is a seam overlap area on the projection surface, wherein there is a seam overlap area between any two adjacent parallel images, and there is a common seam overlap area for the four parallel images at the center.

8. The splicing projection device based on a reflective liquid crystal image modulator according to claim 7, characterized in that: Except for the common overlapping area of ​​the four parallel images, the overlapping area of ​​the seam between two adjacent parallel images is displayed at 50% of the normal brightness of each image; the common overlapping area of ​​the four parallel images is displayed at one-quarter of the normal brightness of each image.

9. The splicing projection device based on a reflective liquid crystal image modulator according to claim 7, characterized in that: For multi-layer exposure of 3D printing applications, corresponding to the exposure of different layers, parallel images are displayed in a rotation mode at the overlapping area of ​​the seams so that each layer maintains normal brightness in the overlapping area of ​​the seams.

10. A field of view splicing projection method based on a reflective liquid crystal image modulator, characterized in that: Use the device as described in any one of claims 1 to 9 to perform field of view stitching projection.

Images