Device for eliminating splicing gap of display screen

Abstract

The device for eliminating the splicing gap of the display screen comprises a light splitting assembly and a stretching deviation assembly, the light splitting assembly is used for dividing a first display image of the display screen adjacent to the first side edge of the splicing gap into a first image and a second image which are the same in picture, the position of the first image is not changed, and the second image deviates to cover part of the splicing gap; a second display image of the display screen adjacent to the second side edge of the splicing gap is divided into a third image and a fourth image which are the same in picture, the position of the third image is not changed, and the fourth image shifts to cover part of the splicing gap; the stretching and shifting assembly comprises a first prism module and a second prism module which are arranged in front of the display screen, located on the two sides of the middle line of the splicing gap and arranged next to each other, and the first prism module is used for stretching a first original image adjacent to the first display image, a first image passing through the light splitting assembly and a second image passing through the light splitting assembly towards the second side edge. The second prism module is used for stretching a second original image adjacent to the second display image and a third image and a fourth image passing through the light splitting assembly towards the first side edge.

Description

Technical Field

[0001] The utility model relates to a device for eliminating the splicing gap of a display screen. Background Art

[0002] Chinese patent document with publication number CN117593966A discloses a seamless splicing display system, which includes a display main body formed by splicing at least two display screens. There is a splicing gap between two adjacent display screens. The characteristics are as follows: it further includes a seam elimination device arranged along the splicing gap for visually eliminating the splicing gap. The seam elimination device includes a light splitting module and a stretching and offsetting module. A splicing line is defined in the width direction of the splicing gap; the light splitting module is used for splitting a first divided image adjacent to the first side of the splicing gap into a first image and a second image with the same picture, the position of the first image remains unchanged, and the second image is offset to the second side adjacent to the splicing gap on one side; and for splitting a second divided image adjacent to the second side of the splicing gap into a third image and a fourth image with the same picture, the position of the third image remains unchanged, and the fourth image is offset to the first side adjacent to the splicing gap on one side. The other side of the second image is adjacent to or close to the other side of the fourth image; the stretching and offsetting module includes a first prism module and a second prism module which are respectively arranged on both sides of the splicing line and are closely arranged. The first prism module is used for stretching and offsetting a first original image, the first image and the fourth image adjacent to the first divided image towards the second side of the splicing gap, so that one side of the fourth image is adjacent to the splicing line, and the other side is adjacent to or close to the second side of the splicing gap; the second prism module is used for stretching and offsetting a second original image, the third image and the second image adjacent to the second divided image towards the first side of the splicing gap, so that one side of the second image is adjacent to the splicing line, and the other side is adjacent to or close to the first side of the splicing gap, so that the second image overlaps or substantially overlaps with the first image, and the fourth image overlaps or substantially overlaps with the third image.

[0003] In the above solution, in order to make the picture continuous at the splicing gap, the first image, the second image, the third image and the fourth image split by the light splitting module are staggered. It is bound to be more complex in the implementation manner of the light splitting module. Specifically in the embodiment, two overlapping beam splitters are used, resulting in a larger volume and more complex structure of the seam elimination device, which is not conducive to the popularization and application of the product. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for eliminating the splicing gap of a display screen with a simple structure.

[0005] The purpose of the utility model is achieved by the following technical means:

[0006] A device for eliminating the splicing gap of a display screen, characterized in that it includes a light splitting component and a stretching and offsetting component. The light splitting component is used to divide the first display image of the display screen adjacent to the first side of the splicing gap into a first image and a second image with the same picture. The position of the first image remains unchanged, and the second image is offset to cover part of the splicing gap. The second display image of the display screen adjacent to the second side of the splicing gap is divided into a third image and a fourth image with the same picture. The position of the third image remains unchanged, and the fourth image is offset to cover part of the splicing gap. The stretching and offsetting component includes a first prism module and a second prism module arranged in front of the display screen on both sides of the midline of the splicing gap and arranged closely. The first prism module is used to stretch the first original image adjacent to the first display image, the first image and the second image passing through the light splitting component towards the second side. The second prism module is used to stretch the second original image adjacent to the second display image, the third image and the fourth image passing through the light splitting component towards the first side.

[0007] The first image and the second image separated by the light splitting component are arranged adjacently, and the second image is used to cover part of the splicing gap in the width direction of the splicing gap. The same is true for the third image and the fourth image. Compared with the way in the prior art where the first image, the second image, the third image and the fourth image are staggered, the light splitting component of this patent must be simpler in structure. Although the splicing gap is blocked by the images separated by the light splitting component, the picture at the splicing gap is not continuous, and two repeated images may be seen. However, since the proportion of the splicing gap in the display screen is very small, the viewer cannot distinguish whether there are two repeated images unless observing in detail at a position very close to the splicing gap. Therefore, this problem can be ignored.

[0008] One side of the second image is adjacent to the first side, and the other side is adjacent to the midline of the splicing gap. One side of the fourth image is adjacent to the second side, and the other side is adjacent to the midline of the splicing gap; or, one side of the second image is adjacent to the first side, and the other side is close to the midline of the splicing gap. One side of the fourth image is adjacent to the second side, and the other side is close to the midline of the splicing gap.

[0009] The light splitting component includes a first beam splitter and a second beam splitter. The first beam splitter has a first inclined surface and a second inclined surface. Part of the light of the first display image passes through the first inclined surface to form the first image, and part is reflected by the first inclined surface to the second inclined surface and then reflected by the second inclined surface to form the second image. The second beam splitter has a third inclined surface and a fourth inclined surface. Part of the light of the second display image passes through the third inclined surface to form the third image, and part is reflected by the third inclined surface to the fourth inclined surface and then reflected by the fourth inclined surface to form the fourth image.

[0010] The first inclined plane and the second inclined plane are arranged in parallel, the third inclined plane and the fourth inclined plane are arranged in parallel, and the inclination angles of the first inclined plane, the second inclined plane, the third inclined plane and the fourth inclined plane are 35° to 50°.

[0011] The first prism module and / or the second prism module includes a first prism. The first prism has a first horizontal plane and a first inclined plane arranged oppositely. The first horizontal plane is arranged parallel and at an interval to the display screen, and the first inclined plane causes the image to produce a stretching offset in the direction perpendicular to the midline of the splicing gap.

[0012] The distance between the first horizontal plane and the display screen is 3 - 11 mm, the minimum distance between the first inclined plane and the display screen is 0 - 4 mm, and the maximum distance between the first horizontal plane and the first inclined plane is 3 - 9 mm. Compared with the prior art, the thickness of the first prism is thinner, saving materials, and the overall thickness of the first prism and the display screen is also thinner, making the product visually more conformable to the display screen.

[0013] The first prism module and / or the second prism module includes a micro - prism group. The micro - prism group includes a plurality of micro - prisms arranged closely in the direction perpendicular to the splicing gap. The micro - prism has a second horizontal plane and a second inclined plane arranged oppositely. The second horizontal plane is arranged parallel and at an interval to the display screen, and the second inclined plane causes the image to produce a stretching offset in the direction perpendicular to the midline of the splicing gap. The inclination angles of the second inclined planes of the plurality of micro - prisms in the micro - prism group gradually increase towards the midline direction of the splicing gap.

[0014] The distance between the second horizontal plane and the display screen is 4 - 12 mm, the minimum distance between the second inclined plane of the micro - prism group and the display screen is 2 - 9 mm, and the maximum distance between the second horizontal plane and the second inclined plane is 1 - 3 mm. Compared with the prior art, the thickness of the micro - prism group is thinner, saving materials, and the overall thickness of the micro - prism group and the display screen is also thinner, making the product visually more conformable to the display screen.

[0015] The first prism module and / or the second prism module includes a second prism. The second prism has a third horizontal plane and an elliptical arc surface arranged oppositely, and the elliptical arc surface causes the image to produce a stretching offset in the direction perpendicular to the midline of the splicing gap.

[0016] The elliptical eccentricity of the elliptical arc surface > 0.9.

[0017] Both the first prism module and the second prism module include two of the first prisms arranged at intervals. In this way, the first prism module and the second prism module can form a two - layer structure, which can increase the effect of stretching offset, and users can cover the splicing gap when viewing the display screen at a larger angle.

[0018] Both the first prism module and the second prism module include two said micro - prism groups arranged at intervals. In this way, the first prism module and the second prism module can form a two - layer structure, which can increase the effect of stretching and offset. Users can cover the splicing gap when viewing the display screen at a larger angle.

[0019] Both the first prism module and the second prism module include two said second prisms arranged at intervals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a working principle diagram of the spectroscopic component of the present utility model in adjacent connection.

[0021] Figure 2 It is a working principle diagram of the spectroscopic component of the present utility model not in adjacent connection.

[0022] Figure 3 It is a working principle diagram of the spectroscopic component of the present utility model in adjacent connection and with a gap between the first image and the second image.

[0023] Figure 4 It is a working principle diagram of the light ray offset of the downward - inclined prism of the stretching and offset module of the present utility model.

[0024] Figure 5 It is a working principle diagram of the light ray offset of the upward - inclined prism of the stretching and offset module of the present utility model.

[0025] Figure 6 For Figure 5 Partial enlarged view.

[0026] Figure 7 It is a schematic structural diagram of the present utility model using the first prism.

[0027] Figure 8 It is a schematic structural diagram of the present utility model using the micro - prism group.

[0028] Figure 9 It is a schematic structural diagram of the present utility model using the second prism.

[0029] Figure 10 It is a working principle diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Referring to Figures 1 to 10 As shown, a device for eliminating the splicing gap W of a display screen includes a spectroscopic component and a stretching and offset component, as Figure 1As shown in the figure, the light splitting component is used to divide the first display image A of the display screen adjacent to the first side W1 of the splicing gap W into a first image A1 and a second image A2 with the same picture and adjacent to each other. The position of the first image A1 remains unchanged, and the second image A2 is offset to cover a part of the splicing gap W. The second display image B of the display screen adjacent to the second side W2 of the splicing gap W is divided into a third image B1 and a fourth image B2 with the same picture and adjacent to each other. The position of the third image B1 remains unchanged, and the fourth image B2 is offset to cover a part of the splicing gap W. The light splitting component can also be set as shown in Figure 3 As shown in the figure, there is a gap between the first image A1 and the second image A2 split from the first display image A. The light splitting component consists of a first beam splitter 11 and a second beam splitter 12. The first beam splitter 11 has a first inclined surface 111 and a second inclined surface 112. Part of the light of the first display image A passes through the first inclined surface 111 to form the first image A1, and part is reflected by the first inclined surface 111 to the second inclined surface 112 and then reflected by the second inclined surface 112 to form the second image A2. The second beam splitter 12 has a third inclined surface 121 and a fourth inclined surface 122. Part of the light of the second display image B passes through the third inclined surface 121 to form the third image B1, and part is reflected by the third inclined surface 121 to the fourth inclined surface 122 and then reflected by the fourth inclined surface 122 to form the fourth image B2. The inclination angles of the first inclined surface 111, the second inclined surface 112, the third inclined surface 121, and the fourth inclined surface 122 are 35° to 50°. Setting the inclination angles within this range can well realize the light splitting function of the light splitting component, and the first inclined surface 111 and the second inclined surface 112 can be set parallel, and the third inclined surface 121 and the fourth inclined surface 122 can be set parallel. The best inclination angle of the second inclined surface 112 and the fourth inclined surface 122 relative to the display screen is 45°, and the preferred inclination angles of the first inclined surface 111 and the third inclined surface 121 can be set between 35° and 45°.

[0031] As shown in Figure 1 As shown in the figure, the first beam splitter 11 and the second beam splitter 12 are symmetrically and adjacently arranged. One side of the second image A2 generated by the first display image A passing through the first beam splitter 11 is adjacent to the first side W1, and the other side is adjacent to the midline O of the splicing gap W. One side of the fourth image B2 generated by the second display image B passing through the second beam splitter 12 is adjacent to the second side W2, and the other side is adjacent to the midline O of the splicing gap W. In this way, the splicing gap W can be completely covered visually. Or, as shown in Figure 2 As shown in the figure, the first beam splitter 11 and the second beam splitter 12 are not adjacently arranged. One side of the second image A2 generated by the first display image A passing through the first beam splitter 11 is adjacent to the first side W1, and the other side is close to the midline O of the splicing gap W. One side of the fourth image B2 generated by the second display image B passing through the second beam splitter 12 is adjacent to the second side W2, and the other side is close to the midline O of the splicing gap W. In this way, a gap can be allowed between the first beam splitter 11 and the second beam splitter 12.

[0032] The stretching and offset component includes a first prism module and a second prism module which are arranged in front of the display screen, on both sides of the center line O of the splicing gap W and adjacent to each other. The first prism module is used to stretch the first original image C1 adjacent to the first display image A, the first image A1 and the second image A2 passing through the light splitting component towards the second side W2, and the second prism module is used to stretch the second original image C2 adjacent to the second display image B, the third image B1 and the fourth image B2 passing through the light splitting component towards the first side W1.

[0033] The first implementation manner of the first prism module and the second prism module: Both the first prism module and the second prism module are first prisms 21. The two first prisms 21 are symmetrically arranged. The first prism 21 has a first horizontal plane and a first inclined plane arranged oppositely. The first horizontal plane is arranged parallel and spaced from the display screen. The first inclined plane causes the image to produce stretching and offset in the direction perpendicular to the center line O of the splicing gap W. The distance between the first horizontal plane and the display screen is 3 - 11 mm, the minimum distance between the first inclined plane and the display screen is 0 - 4 mm, and the maximum distance between the first horizontal plane and the first inclined plane is 3 - 9 mm. Such a setting can make the overall thickness of the first prism 21 and the display screen thinner, and it can be more visually fitting. In addition, the stretching and offset effect of the first prism 21 is also better. Figure 10 As shown, both the first prism module and the second prism module can be provided with two spaced first prisms 21. In this way, the first prism module and the second prism module can form a two-layer structure, which can increase the stretching and offset effect. The user can also cover the splicing gap W when viewing the display screen at a larger angle. The first prism 21 close to the display screen is the first-layer first prism 21, and the first prism 21 far from the display screen is the second-layer first prism 21. The minimum distance between the first-layer first prism 21 and the light splitting component is 0 - 2 mm, which can make the stretching and offset effect better and can better cover the splicing gap W. The first-layer first prism 21 can be an upward-inclined prism or a downward-inclined prism, and the second-layer first prism 21 is a downward-inclined prism.

[0034] The second implementation manner of the first prism module and the second prism module: The first prism module and the second prism module are micro prism groups 22 arranged symmetrically. Figure 8As shown, the micro prism group 22 includes a plurality of micro prisms closely arranged along the direction of the center line O of the vertical splicing gap W. The micro prism has a second horizontal plane and a second inclined plane arranged oppositely. The second horizontal plane is arranged parallel and spaced from the display screen. The second inclined plane of the micro prism causes the image to produce a stretching offset along the direction of the center line O of the vertical splicing gap W. The inclination angles of the second inclined planes of the plurality of micro prisms in the micro prism group 22 gradually increase towards the center line O of the splicing gap W, so that the closer the image is to the splicing gap W, the stronger the stretching offset effect. The distance between the second horizontal plane and the display screen is 4-12 mm. The minimum distance between the second inclined plane of the micro prism group 22 and the display screen is 2-9 mm. The maximum distance between the second horizontal plane and the second inclined plane is 1-3 mm. Such a setting can make the overall thickness of the micro prism group 22 and the display screen thinner, and it can be more fitting visually. And in this way, the stretching offset effect of the micro prism group 22 is also better. Both the first prism module and the second prism module can be provided with two micro prism groups 22 arranged at intervals. In this way, the first prism module and the second prism module can form a two-layer structure, which can increase the stretching offset effect. The user can also cover the splicing gap W when viewing the display screen at a larger angle. The micro prism group 22 close to the display screen is the first-layer micro prism group 22, and the micro prism group 22 far from the display screen is the second-layer micro prism group 22. The minimum distance between the first-layer micro prism group 22 and the light splitting component is 0-2 mm, which can make the stretching offset effect better and can better cover the splicing gap W.

[0035] Due to the change of the inclination angle of the micro prism group, it is easy to present a wavy imaging. Therefore, the first prism module and the second prism module can adopt a third implementation manner. The third implementation manner of the first prism module and the second prism module is: the first prism module and the second prism module are symmetrically arranged second prisms 23. The second prism 23 has a third horizontal plane and an elliptical arc surface arranged oppositely. The elliptical arc surface causes the image to produce a stretching offset along the direction of the center line of the vertical splicing gap. The elliptic eccentricity of the elliptical arc surface >0.9. Using the elliptical arc surface to stretch and offset the image can overcome the problem of wavy imaging.

[0036] The derivation of the light stretching offset formula of the downward inclined prism mirror surface of the stretching offset module is as follows: As Figure 4 shown, assume that the light-emitting point of the display body is D, the straight-incident prism slope mirror surface point of the outgoing light ray is E, the obliquely incident prism slope mirror surface point is B, the point on the connection plane corresponding to point B perpendicular to the light-emitting point is A, the point on the display body plane corresponding to the vertical direction of point B is C, and the starting point of the prism slope mirror surface is O. h 1 +h 2 =h, and the light stretching offset amount is

[0037] According to Snell's law n 1 sinθ 1 =n2 sinθ 2 Assume that n 2 is the air medium, θ 2 is the incident angle of the normal line 1, θ 1 is the refraction angle of the normal line 1, n 1 is the refractive index of the prism medium, the refraction angle θ 1 = prism angle θ 1 So n 2 = 1, sinθ 2 = n 1 sinθ 1 θ 2 = asin(n 1 sinθ 1 ),θ 2 -θ 1 = θ 3 ,

[0038] θ 3 = asin(n 1 sinθ 1 )-θ 1 .

[0039] w * tanθ 1 = h 1 , h 2 = h - h 1 ,

[0040] (h - h 1 ) * tanθ 3 = d, stretching offset formula:

[0041] d = h 2 * tan[asin(n 1 sinθ 1 ) - θ 1 .

[0042] The derivation of the stretching offset formula for the upward-sloping prism mirror surface of the stretching offset module is as follows: As Figure 5 and Figure 6 shown, assume that the light-emitting point of the display body is E, the point where the outgoing light ray directly enters the prism plane is D, the point where the light ray obliquely enters the prism plane is C, the light-emitting point corresponding to point C on the prism slope mirror surface is A, the point on the prism plane corresponding to the vertical direction of A is B, the point corresponding to the display body plane is F, and the starting point of the prism slope mirror surface is O, The light stretching offset amount is

[0043] According to Snell's law n 1sinθ 1 =n 2 sinθ 2 , assuming n 1 is the refractive index of the prism medium, θ 1 is the incident angle of the refracted light with respect to the normal 1, n 2 is the air medium, θ 2 is the refraction angle of the normal 1 at point A, θ 3 is the refraction angle of the normal 2 at point C, θ 4 is the incident angle of the normal 2 at point C, θ 1 +θ 3 =θ 2 (∠CAB and θ 3 are equal as alternate interior angles of parallel lines), θ 2 = the prism slope angle, so n 2 = 1, n 1 sinθ 1 = sinθ 2 , sinθ 1 = sin

[0044] θ 2 / n 1 , θ 1 = asin(sinθ 2 / n 1 ). θ 2 -θ 1 = θ 3 , θ 3 = θ 2 - asin(sinθ 2 / n 1 ),

[0045] n 1 sinθ 3 = n 2 sinθ 4 , sinθ 4 = n 1 * sin[θ 2 - asin(sinθ 2 / n 1 )], θ 4 = asin{n 1 * sin[θ 2 -

[0046] asin(sinθ 2 / n 1 )]}, θ 4 The included angle ∠E between the direct light output and the oblique light output of the display body is equal as alternate interior angles of parallel lines.

[0047]

[0048] d = h' * tanθ 3 + h * tanθ 4 。

[0049] The stretching offset formula is d = h' * tan[θ 2 - asin(sinθ 2 / n 1 )] + h * tan(asin{n 1 * sin[θ 2- asin(sinθ 2 / n 1 )]})。

[0050] The letters or numbers used in the above formula derivation are not equal to the reference signs in the drawings of this embodiment.

[0051] The first image A1 and the second image A2 separated by the beam splitting component are adjacently arranged, and the second image A2 is used to cover a part of the splicing gap W in the width direction of the splicing gap W. The same is true for the third image B1 and the fourth image B2. Compared with the way in the prior art where the first image, the second image, the third image, and the fourth image are staggered, the beam splitting component of this patent is bound to be simpler in structure. Although the splicing gap W is blocked by the images separated by the beam splitting component, the picture at the splicing gap W is not continuous. It is equivalent to copying the images on both sides of the splicing gap W to the splicing gap W. Two duplicate images may be seen. However, since the width of the splicing gap W is only 3 - 5 mm specifically, its proportion in the display screen is very small. In reality, it is usually large display screens used in large-scale events such as concerts that have splicing gaps W. The viewers are at a relatively far distance and cannot distinguish whether there are two duplicate images unless observing in detail from a position very close to the splicing gap W. Therefore, this problem can be ignored.

[0052] As Figure 10 shown, LV is the visual effect viewed from the left side angle, RV is the visual effect viewed from the right side angle, and MV is the visual effect viewed from the front angle. The images they view are different, but under the action of the stretching offset module, they can all cover the splicing gap W and achieve the effect of seamless splicing.

[0053] The above is only a preferred embodiment of the present invention, and thus cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A device for eliminating the splicing gap of a display screen, characterized in that: It includes a splitter component and a stretching and offset component. The splitter component is used to split the first display image of the display screen adjacent to the first side of the splicing gap into a first image and a second image with the same picture, the position of the first image remains unchanged, and the second image is offset to cover part of the splicing gap, and the second display image of the display screen adjacent to the second side of the splicing gap is split into a third image and a fourth image with the same picture, the position of the third image remains unchanged, and the fourth image is offset to cover part of the splicing gap; the stretching and offset component includes a first prism module and a second prism module which are arranged in front of the display screen, on both sides of the center line of the splicing gap and are arranged closely, the first prism module is used to stretch the first original image adjacent to the first display image, the first image and the second image passing through the splitter component toward the second side, and the second prism module is used to stretch the second original image adjacent to the second display image, the third image and the fourth image passing through the splitter component toward the first side, and the splitter component includes a first beam splitter and a second beam splitter, and the first beam splitter and the second beam splitter are symmetrical and adjacent to each other.

2. The device for eliminating the splicing gap of a display screen according to claim 1, characterized in that: One side of the second image is adjacent to the first side, and the other side is adjacent to the centerline of the stitching gap, one side of the fourth image is adjacent to the second side, and the other side is adjacent to the centerline of the stitching gap; or, one side of the second image is adjacent to the first side, and the other side is close to the centerline of the stitching gap, and one side of the fourth image is adjacent to the second side, and the other side is close to the centerline of the stitching gap.

3. The device for eliminating the splicing gap of a display screen according to claim 1, characterized in that: The first beam splitter has a first inclined surface and a second inclined surface, and part of the light of the first display image passes through the first inclined surface to form the first image, and part of it is reflected by the first inclined surface to the second inclined surface, and then reflected by the second inclined surface to form the second image; the second beam splitter has a third inclined surface and a fourth inclined surface, and part of the light of the second display image passes through the third inclined surface to form the third image, and part of it is reflected by the third inclined surface to the fourth inclined surface, and then reflected by the fourth inclined surface to form the fourth image.

4. The device for eliminating the splicing gap of a display screen according to claim 3, characterized in that: The first inclined plane and the second inclined plane are arranged in parallel, the third inclined plane and the fourth inclined plane are arranged in parallel, and the inclination angles of the first inclined plane, the second inclined plane, the third inclined plane and the fourth inclined plane are 35° to 50°.

5. A device for eliminating a splicing gap of a display screen according to any one of claims 1 to 4, characterized in that: The first prism module and / or the second prism module includes a first prism having a first horizontal plane and a first inclined plane arranged opposite to each other, the first horizontal plane is arranged parallel to the display screen and spaced apart, and the first inclined plane causes the image to be stretched and offset in a direction perpendicular to the center line of the splicing gap.

6. The device for eliminating the splicing gap of a display screen according to claim 5, characterized in that: The distance between the first horizontal plane and the display screen is 3-11 mm, the minimum distance between the first inclined plane and the display screen is 0-4 mm, and the maximum thickness of the first prism is 3-9 mm.

7. A device for eliminating a splicing gap of a display screen according to any one of claims 1 to 4, characterized in that: The first prism module and / or the second prism module includes a microprism group, the microprism group includes a plurality of microprisms closely arranged in a direction perpendicular to the stitching gap, the microprism has a second horizontal plane and a second inclined plane arranged relatively to each other, the second horizontal plane is arranged parallel to the display screen and spaced apart, the second inclined plane causes the image to be stretched and offset in a direction perpendicular to the centerline of the stitching gap, and the inclination angles of the second inclined planes of the plurality of microprisms in the microprism group gradually increase toward the centerline of the stitching gap.

8. The device for eliminating the splicing gap of a display screen according to claim 7, characterized in that: The distance between the second horizontal plane and the display screen is 4-12 mm, the minimum distance between the second inclined plane and the display screen is 2-9 mm, and the maximum thickness of the microprism group is 1-3 mm.

9. A device for eliminating a splicing gap of a display screen according to any one of claims 1 to 4, characterized in that: The first prism module and / or the second prism module comprises a second prism, and the second prism has a third horizontal plane and an elliptical arc surface which are arranged opposite to each other, and the elliptical arc surface causes the image to be stretched and offset along a direction perpendicular to the midline of the splicing gap.

10. The device for eliminating the splicing gap of a display screen according to claim 9, characterized in that: The elliptical eccentricity of the elliptical arc surface is greater than 0.

9.

11. The device for eliminating the splicing gap of a display screen according to claim 5, characterized in that: The first prism module and the second prism module each include two first prisms arranged at an interval.

12. The device for eliminating the splicing gap of a display screen according to claim 7, characterized in that: The first prism module and the second prism module each include two micro-prism groups arranged at intervals.

13. The device for eliminating the splicing gap of a display screen according to claim 9, characterized in that: The first prism module and the second prism module each include two second prisms arranged at an interval.

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