A high-resolution projection display device

Abstract

The present invention proposes a high-resolution projection display device. The high-resolution projection device is composed of a grating screen, a first projector, a second projector, a third projector, and a fourth projector; the first to fourth projectors are arranged to form an array, and the light of the projected image has the same linear polarization direction; the grating screen is composed of a polarization grating, a 1 / 4 wave plate, and a diffuse reflection layer, and they are placed in sequence front and back; the polarization grating is prepared by punching holes in the polarizing plate, and the position of the pixel of the image projected by each projector coincides with the position of the through hole; due to the different spatial positions of the first to fourth projectors, the light projected by them can form four pixel spots with different spatial positions after passing through the holes; these pixel spots are combined to form an image with a 4-times pixel resolution, and due to the modulation of the 1 / 4 wave plate, it can be displayed in all directions.

Description

Technical Field

[0001] The present invention relates to display technology, and more particularly, to projection display technology. Background Art

[0002] A projection display device can project an image onto a screen, and has an advantage in screen size over a conventional flat panel display device. Typically, a conventional projection device only uses a single projector to complete projection, and the resolution of the image is determined by the resolution of the single projector. When the application scenario requires high-resolution projection display, conventional projection devices will encounter bottlenecks. Therefore, the present invention proposes a high-resolution projection display device, which realizes image projection through multiple projectors, thereby realizing high-resolution image display. Summary of the invention

[0003] The present invention provides a high-resolution projection display device. Figure 1 The schematic diagram of the structure of the high-resolution projection display device is shown in FIG. The high-resolution projection device is composed of a grating screen, a first projector, a second projector, a third projector, and a fourth projector.

[0004] Furthermore, the first to fourth projectors are arranged to form an array, and the light rays of the projected images have the same linear polarization direction.

[0005] For further information, please refer to Figure 2 The grating curtain is composed of a polarization grating, a quarter wave plate and a diffuse reflection layer, which are placed in sequence. The polarization grating is prepared by punching a polarizing plate, and the through holes formed are arranged in an array. The linear polarized light projected by the first to fourth projectors is orthogonal to the polarization direction allowed to pass through the polarizing plate, and the projected light can only pass through the through holes on the polarizing plate. The optical axis direction of the quarter wave plate is at an angle of 45 degrees to the polarization direction of the projected light.

[0006] Furthermore, the number and arrangement of pixels of the images projected by the first to fourth projectors are consistent with the number and arrangement of through holes in the through hole array on the polarization grating, and the position of the pixels of the image projected by each projector coincides with the position of the through holes. The projection position calibration adopts the existing trapezoidal calibration and projection area calibration technology.

[0007] For further information, please refer to Figure 3 , because of the different spatial positions of the first to fourth projectors, the light they project passes through the same through hole on the polarization grating and can form four pixel spots with different spatial positions on the diffuse reflection layer through a 1 / 4 wave plate. These pixel spots formed through all the through holes can be combined to form an image and displayed in all directions. Assuming that the first to fourth projectors can provide N pixels, a total of 4N pixels can be realized on the diffuse reflection layer, thereby achieving a high-resolution projection display with 4 times the pixels.

[0008] For details, please refer to Figure 4 , after the light projected by the first to fourth projectors passes through the through hole on the polarization grating, it is converted into circularly polarized light by the 1 / 4 wave plate. After the circularly polarized light reaches the diffuse reflection layer and is reflected, it will pass through the 1 / 4 wave plate again, and thus be modulated into linearly polarized light whose polarization direction is orthogonal to the polarization direction of the incident light, so that it can pass through the polarization grating and be projected in all directions in space.

[0009] Optionally, referring to the display principle of higher resolution formed by the first to fourth projectors, more projectors may be provided for image projection.

[0010] In the present invention, since multiple projectors can be used for image display, the total number of pixels of the displayed image is the sum of the number of pixels of the multiple projectors. Compared with the traditional projection device that only uses a single projector, the present invention can significantly improve the resolution of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 It is a schematic structural diagram of the grating curtain of the present invention.

[0014] Figure 3 It is a schematic diagram of a light spot formed by a projector on a grating screen in the present invention.

[0015] Figure 4 This is a schematic diagram of the polarization modulation principle of the present invention.

[0016] Icons: 010-high-resolution projection display device; 100-grating screen; 210-first projector; 220-second projector; 230-third projector; 240-fourth projector; 110-polarization grating; 120-1 / 4 wave plate; 130-diffuse reflection layer; 310-first projection image spot; 320-second projection image spot; 330-third projection image spot; 340-fourth projection image spot.

[0017] It should be understood that the above drawings are only schematic and are not drawn to scale. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second”, etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] Example 1

[0023] Figure 1 This is a schematic diagram of the structure of the high-resolution projection display device 010 provided in this embodiment. In the figure, the x coordinate represents the horizontal direction in space, the y coordinate represents the vertical direction in space, and the z coordinate represents the direction perpendicular to the xy plane. Figure 1 The present embodiment provides a high-resolution projection display device 010 , which is composed of a grating screen 100 , a first projector 210 , a second projector 220 , a third projector 230 , and a fourth projector 240 .

[0024] Please refer to Figure 1 The first to fourth projectors 210-240 are arranged to form an array, and the light of the projected image is vertically linearly polarized light.

[0025] Please refer to Figure 2 The grating curtain 100 is composed of a polarization grating 110, a quarter wave plate 120 and a diffuse reflection layer 130, which are placed in sequence. The polarization grating 110 is prepared by punching a polarizing plate, and the through holes formed are arranged in an array. The polarizing plate allows horizontal polarized light to pass through, but does not allow vertical polarized light to pass through, so the projected light can only pass through the through holes on the polarizing plate. The optical axis direction of the quarter wave plate is at an angle of 45 degrees to the polarization direction of the projected light.

[0026] The resolution of the images projected by the first to fourth projectors 210-240 is 1920×1080, and the through holes on the polarization grating 110 also form an array of 1920×1080. Using the existing trapezoidal calibration and projection area calibration technology, the position of the pixel of the image projected by each projector coincides with the position of the through hole.

[0027] Please refer to Figure 3 , the first to fourth projectors 210-240 have different spatial positions, and after the light they project passes through the same through hole on the polarization grating, it can form four pixel light spots 310-340 with different spatial positions on the diffuse reflection layer through a 1 / 4 wave plate. The pixel light spots formed by all 1920×1080 through holes can be combined to form an image and displayed in all directions. Since the first to fourth projectors 210-240 can provide 1920×1080 pixels, a total of 3840×2160 pixels can be realized on the diffuse reflection layer, thereby realizing a high-resolution projection display with 4 times the pixels.

[0028] For details, please refer to Figure 4 , the vertically polarized light projected by the first to fourth projectors 210-240 passes through the through hole on the polarization grating 110, and is converted into circularly polarized light by the 1 / 4 wave plate 120. After the circularly polarized light reaches the diffuse reflection layer and is reflected, it will pass through the 1 / 4 wave plate again, and thus be modulated into horizontally polarized light. Therefore, the reflected horizontally polarized light can pass through the polarization grating 110 and be projected in all directions in space.

[0029] In the present invention, since four projectors can be used for image display, the total number of pixels of the displayed image is the sum of the number of pixels of the four projectors. Compared with a traditional projection device that only uses a single projector, the present invention can significantly improve the resolution of the image.

Claims

1. A high-resolution projection display device, characterized in that: The high-resolution projection device is composed of a grating screen, a first projector, a second projector, a third projector, and a fourth projector; the first to fourth projectors are arranged to form an array, and the light of the projected images has the same linear polarization direction; the grating screen is composed of a polarization grating, a 1 / 4 wave plate and a diffuse reflection layer, and are placed in a front-to-back order; the polarization grating is prepared by punching a polarizing plate, and the through holes formed are arranged in an array; the linear polarized light projected by the first to fourth projectors is orthogonal to the polarization direction allowed to pass by the polarizing plate, and the projected light can only pass through the through holes on the polarizing plate; the optical axis direction of the 1 / 4 wave plate is at an angle of 45 degrees to the polarization direction of the projected light; the number and arrangement of pixels of the images projected by the first to fourth projectors are consistent with the number and arrangement of through holes in the through hole array on the polarization grating, and each projector The position of the pixel of the projected image coincides with the position of the through hole; due to the different spatial positions of the first to fourth projectors, the light they project passes through the same through hole on the polarization grating, and can form 4 pixel spots with different spatial positions on the diffuse reflection layer through a 1 / 4 wave plate; for all the through holes, all these pixel spots can be combined to form an image and displayed in all directions, thereby achieving a high-resolution projection display with 4 times the pixels; after the light projected by the first to fourth projectors passes through the through holes on the polarization grating, it is converted into circularly polarized light by the 1 / 4 wave plate; after the circularly polarized light reaches the diffuse reflection layer and is reflected, it will pass through the 1 / 4 wave plate again, and is thereby modulated into linearly polarized light with a polarization direction orthogonal to the polarization direction of the incident light, so that it can pass through the polarization grating and be projected in all directions in space.

2. A high-resolution projection display device as claimed in claim 1, characterized in that: Set up more projectors to project images and achieve higher resolution.

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