KR200209088Y1 - Real Or Virtual System With Preventing Refractive Imaging - Google Patents

Abstract

The virtual or real image display system of the present invention comprises: (a) a first image source for projecting a first image from the beginning of the first optical path to the end of the first optical path that is visible of the first phase; (b) spherical concave mirror; (c) a first beam splitter inclined at about 45 degrees positioned in a first optical path between the first phase source and the mirror; And (d) an antireflective barrier in the projection opening in front of the system and through which the first image projected from the system passes, and optionally (e) in the first optical path between the first beam splitter and the mirror. And circularly polarizing means for circularly polarizing the light source, and (f) linearly polarizing means for linearly polarizing light, located at the first optical path between the end of the first optical path to be visualized and the first beam splitter. The system does not degrade the optical resolution and contrast of the image projected in the system because light outside the system is not projected and reflected and is projected inside the system to produce little ghost image.

Description

Real Or Virtual System With Preventing Refractive Imaging

The present invention relates to a virtual or real display system that excludes phase interference such as reflections and / or ghosts from outside the system, and specifically projects from the inside of the system by a background image and a light source present outside the system. In order to prevent the virtual image or the actual image to be interfered with, an anti-reflection blocking film and / or a linear polarizing means and a circular polarizing means are provided.

Modern image forming display systems are required to provide an image that is clear, distorted and of good contrast to the viewer. In reality, virtual or infinity imaging systems typically have a front window in front of the system in which the image is projected and a curved mirror inside the device to provide a clear image. One of the main problems is that the external light source and / or the background image form a reflection image partially reflected in the front window, and the external light source projected into the system, etc. is the focal point of the first image projected from the system and observed. To form an additional ghost image in the vicinity.

1 shows ghost image formation in the prior art imaging system 10. The target or CRT, which is the first image 12, is projected along a first optical path PP comprising a beamsplitter 14 and a curved mirror 16. The first phase 18 is formed as indicated by the focal FP _R outside the system. The first external light 19 is reflected by the front window on the system to form the reflection image 19-1, and the second external light 20 incident in the system 10 causes the second optical path SP in the system. Passing and forming a ghost image 21-1 at the focal point FP _{G which} does not coincide with FP _R by different angles of incidence reflected from the mirror 16 at different angles. Therefore, the contrast and the resolution of the first phase 18 are poor.

As part of the effort to remove the ghost image 20-1, an absorption beam splitter may be used, and although it is effective in reducing the brightness of the ghost image, the ghost image still appears.

As another example, U. S. Patent No. 5,585, 946 of FIG. 2A describes a linear polarizer 30, a quarter wave plate 32, a window 34, a mirror 16, and an on-axis. An image forming system is disclosed that includes a beam splitter 38 that is inclined at about 45 degrees relative to. The quarter wave plate is an optical element for circularly polarizing unpolarized light and for shifting polarized light by 45 degrees. FIG. 2B shows the transmittance of the first phase forming light in the image forming system, and FIGS. 2C and 2D show the transmittance of external light in the system as the ratio of the light intensity of the initial light source passing through each structure. 2B-2D, the transmittance of the first phase forming light exiting the window 34 is about 10.62%, and the transmittance of external light entering and exiting the system is about 5.313%. Unpolarized external light incident on the system through the window 34 is, for example, horizontally polarized by the linear polarizer 30 and polarized in a right circle when passing through the quarter wave plate 32. The external light passes through the beam splitter 38 once before it hits the mirror, and once after it has been reflected from the mirror, changing twice between the right- and left-circle polarization. However, in this process, since the beam splitter 38 introduces an elliptic component into the circularly polarized light to cause phase-shift, complete blocking is prevented as described above, and the ghost image 20-1 is formed to form the first phase 18. H) resolution and contrast.

Therefore, the present invention aims to solve these problems of the prior art at once and to solve the technical problems that have been requested from the past.

First, the purpose of the present invention is to remove a reflection image of external light by installing a blocking film on the front window of the system.

Secondly, a linear polarizer and a quarter wave plate are installed inside the system to remove ghost images of external light.

1 is a schematic diagram of an imaging system of the prior art;

2A-2D are schematic and light transmission characteristic diagrams of another prior art image forming system;

3A to 3D are schematic and light transmission characteristic diagrams of an on-axis arrangement of an image forming display system according to an embodiment of the present invention;

4A to 4D are schematic diagrams and optical characteristics and characteristic diagrams of a axial arrangement of an image forming display system according to an embodiment of the present invention;

5A to 5D are schematic and optical characteristics and characteristic diagrams of off-axis of an image forming display system according to an embodiment of the present invention;

6A through 6D are schematic diagrams, optical characteristics, and characteristic diagrams of a stockpiling arrangement of an image forming display system according to an exemplary embodiment of the present invention.

In order to achieve this object, the virtual or real display system of the present invention,

(a) a first phase source for projecting the first image from the beginning of the first optical path to the end of the first optical path that is visible in the first phase;

(b) spherical concave mirror;

(c) a first beam splitter inclined at about 45 degrees positioned in a first optical path between the first phase source and the mirror; And

and (d) an anti-reflective shielding film in the projection port located in front of the system and through which the first image projected from the system passes.

The anti-reflection blocking film is configured to extinguish it by scattering or the like when external light is projected on a window mounted on the projection port, and to prevent reflection. For example, a metal mesh film such as copper or iron may be used. It is not necessarily limited to these. This anti-reflective barrier also limits the amount of external light incident into the system, further limiting the formation of ghost images that are formed projected again from the system.

When a window is provided in the projection port on the front of the system, a reflection image by external light is formed on the window, and when the window is not separately provided in the projection port, a reflection image is formed on the optical element first contacted with the projection port. Therefore, in order to prevent the reflection image from being formed in the optical element inside the system as in the latter case, it can be solved by forming an anti-reflection blocking film in the projection hole as in the present invention.

While such an anti-reflection blocking film almost completely prevents the formation of the reflective image, the formation of the ghost image is not completely prevented. Therefore, it is preferable to additionally provide circular polarization means and linear polarization means in the system internal configuration to prevent the formation of ghost images. That is, in addition to the configuration of (a) to (d),

(e) circular polarization means for circularly polarizing the light beam, located in a first optical path between the first beam splitter and the mirror;

and (f) linear polarization means for linearly polarizing light, located in the first optical path between the end of the first optical path being visualized and the first beam splitter.

By the addition of the above configuration, the external light incident on the system of the present invention is almost blocked before exiting the system, thereby almost eliminating the formation of the ghost image caused from the external light source.

Preferably, the circular polarization means is used by a quarter wave plate, and the linear polarization means is placed on the projection sphere. Therefore, one of the main components of the present invention for the disappearance of the ghost phase is to place a quarter wave plate between the beam splitter and the mirror, whereby the external light between the quarter wave plate and the mirror is kept circularly polarized. This can prevent the introduction of the plea component.

More preferably, the configuration includes a quarter wave plate behind the beam splitter inclined at about 45 degrees, in which case the external light incident on the system and linearly polarized by the linear polarization means on the projection sphere is light of a different orientation. For example, the beam splitter more effectively reflects up and out of the system as compared to unpolarized, circularly polarized or elliptically polarized light. This reduces the brightness of external light in the image forming system and further contributes to the reduction of ghost image formation.

In the case of the aforementioned U.S. patent, the linear polarizer and the quarter wave plate are located between the ends of the light path and the beam splitter where the image is formed, so the unpolarized light is changed from the linear polarizer to horizontal polarization, for example, and the circle on the quarter wave plate. In the polarized state it passes through the beam splitter. The beam splitter is inclined at an angle other than a right angle, for example, about 45 degrees. When the circularly polarized light passes through the substrate, an elliptical polarization component is introduced and is an elliptical polarized light, which is reflected by the mirror and passes through the beam splitter again. As a result, even though the linear polarizer is passed, the ghost image is formed without being completely filtered.

On the other hand, in the present invention, the external light introduced into the system is horizontally polarized, for example, by linear polarization means, maintains horizontal polarization even through the beam splitter, and is circularly polarized while passing through the circular polarization means. When the right polarized light is reflected by the mirror, the left polarized light is changed to the left polarized light, and through the circular polarized means, the vertical polarized light is maintained. Therefore, external light applied to the system does not produce a ghost image.

The anti-reflective blocking film of (d) and the linearly polarizing means of (f) are preferably located on the projection sphere, and the anti-reflective blocking film / linear polarizing means, linearly polarizing means / anti-reflective blocking film in a direction toward the system. Can be placed in order. However, at least the anti-reflective shielding film needs to be located close to the projection port, and the linear polarization means may be contained in the system as long as it is located between the projection port and the beam splitter.

As used herein, 'on-axix' is defined to include an image forming system in which optical elements are arranged close to the constant axis with respect to an optical path within the image forming system as will be apparent to those skilled in the art.

Hereinafter, the content of the present invention will be described in more detail with reference to the embodiments of FIGS. 3 to 6, but the scope of the present invention is not limited to the following contents.

The virtual or real image display system 100 of FIGS. 3A to 3D includes a first projection image source 102 formed by a cathode ray tube or a luminous body and projected as a monochromatic, black and white or color first light beam 103. . The first projection source 102 is any that reflects, transmits, or emits light. The first light beam 103 is partially passed through or reflected by the beam splitter 104 inclined at a 50:50 ratio as shown for the 50% transmission / 50% reflection (50T / 50R) type beam splitter 104. In some cases, this ratio may be other than 50T / 50R. Beam splitter 104 includes a transparent substrate 106, beam splitter coating 108 or any partially reflective coating, and optionally an antireflective coating 110.

The reflected non-polarized light beam 112 passes through a quarter wave plate 114 having no influence on the light beam 112 because it is unpolarized, and then is reflected by the concave mirror 116. The quarter wave plate 114 comprises a quarter wave layer 118 and preferably a transparent substrate layer 120 on the surface of each layer 118. Each layer 120 is preferably coated with an antireflective layer 122. Mirror 116, which may be spherical or aspherical, includes substrate 124, mirror coating 126, and protective overcoat 128. After impinging on the mirror 116, the first light beam 103 begins to converge toward the focal point determined by the radius of curvature of the concave mirror 116. The light beam 103 then passes through each quarter wave plate 114, passes through a beam splitter 104 having a transmittance of 50%, and then linearly polarizes the window 130 to polarize the first light beam 103. ) At about 10.6% of initial brightness. Light appears as horizontal polarization.

The window 130 includes a transparent substrate 132, a linear polarizer 134, and an anti-reflection blocking layer 136. The anti-reflection blocking layer 136 is formed of a copper mesh, so that the light beam 161 from the external light source 160 is scattered in the anti-reflecting blocking layer 136 and is not reflected. In some cases, the anti-reflection film 136 may be coded on the surface of the transparent substrate 132. Thereafter, the first light beam 103 converges to form an image 138. The exact location of the image 138 depends on the focal point or radius of the mirror 116. 3B shows the transmission as the light beam 103 passes through the optical system 100. 3C and 3D, the change of the external light is described. In the image forming system 100, the transmission of the external light 160 is incident on the system 100 through the linear polarization window 130, for example, horizontally. An unpolarized external light beam 140 from which polarization is obtained is shown. Thereafter, the light beam 140 passes through the beam splitter 104 while maintaining the horizontal polarization, and then passes through the quarter wave plate 114 to become the right circle 'RC'. Thereafter, the light beam 140 is reflected from the mirror 116 to become a left circle 'LC', and passes through the quarter wave plate 114 to be vertically polarized (“VP”). The light beam 140 passes through the beam splitter 104 again and is almost blocked by the linear polarizer 130 to prevent external light from exiting the system 100 to almost eliminate the cause of ghost formation.

4A-4D, the on-axis display system 200 includes a quarter wave layer 118 positioned on the beam splitter coating 108 to provide a beam splitter and quarter wave plate structure 141. It is arranged similarly to the system 100 except for the main difference that forms the combination. As shown, layer 118 is located on surface 143 of beam splitter coating 108 facing mirror 116. 4B shows the transmittance of the imaging light passing through the system 200, achieving the same or nearly the same transmittance despite several changes in the optical path. 4C and 4D show an analysis of external light incident on the system 200, except that some changes in the optical path due to different relative positions of the optical elements, a system 200 similar to the system 100 is a window. External light is almost blocked before exiting 130, and is effective in almost eliminating the cause of ghost image formation.

5A to 5D, the non-axis display system 300 is a normal axis system, that is, a window 130 is located, light exits the window 130, and is perpendicular or almost perpendicular to the axis on which the image 138 is projected. Similar to systems 100 and 200, except that optical elements 104, 114, and 116 are located along the phosphorus central axis. As shown in FIG. 5B, the imaging light that converges to form the first phase 138 has approximately the same level of brightness as the systems 100 and 200. 5C and 5D show that external light incident on system 300 is effectively blocked as in systems 100 and 200, so that ghost image formation due to external light sources is virtually eliminated.

6A-6D, non-axis display system 400 is a system, except that beam splitter 108 and quarter wave plate 118 are combined into a single structure 402 in system 200. It has an arrangement almost similar to 300. However, the structure 402 is a system in that the structure 402 includes a quarter wave layer 118 located on the side 406 of the structure 402 facing the mirror 116 and the window 130. It is different from the structure 141 of 200. This arrangement is consistent with systems 100, 200, and 300 in the sense that quarter wavelength layer 118 is located between beam splitter coating 108 and mirror 116. As shown in FIG. 6D, the imaging light that converges to form the first phase 138 has approximately the same level of luminance as the systems 100, 200, and 300. 6C and 6D show that external light entering the system 400 is also effectively blocked, so that ghost image formation due to an external light source is almost eliminated.

The imaging systems 100, 200, 300, and 400 optionally project a second phase 146 (indicated by a illusion) and are visible at or near the first phase 138. Second beam splitter 142, indicated by illusion, preferably inclined about 45 degrees relative to monochromatic, black and white or color second light beam 144 forming two phases 148, preferably a 50T / 50R beam splitter It includes. This additional beam splitter 142 allows the second image 148 to be projected from the other side of the image 102.

Imaging systems 100, 200, 300, and 400 optionally include one or more additional monitors 150 that project one or more additional images, such as, for example, one or more background images. . This background image appears as a virtual image located in the system. An advantage on the background is that data or a second side of the phase can be provided behind the first phase.

Those skilled in the art to which the present invention belongs will be able to various modifications and applications within the scope of the present invention based on the above contents.

The image forming display system of the present invention does not deteriorate the optical resolution and contrast of the image projected in the system because light outside the system is not projected and reflected, and is projected inside the system to make almost no ghost image.

Claims (4)

(a) a first phase source for projecting the first image from the beginning of the first optical path to the end of the first optical path that is visible in the first phase; (b) spherical concave mirror; (c) a first beam splitter inclined at about 45 degrees positioned in a first optical path between the first phase source and the mirror; And (d) A virtual image or real image display system, characterized in that it comprises an anti-reflective shielding film in the projection port located in front of the system and the first image projected from the system passes. 2. The virtual image or real image display system according to claim 1, wherein the anti-reflection blocking film is configured to extinguish reflection when external light is projected on a window or the like mounted on the projection port by scattering, etc. The method of claim 1, (e) circular polarization means for circularly polarizing the light beam, located in a first optical path between the first beam splitter and the mirror; and (f) linear polarization means for linearly polarizing light located at a first optical path between the end of the first optical path being visualized and a first beam splitter. The virtual image or real image display system according to claim 3, wherein the circular polarizing means is a quarter wave plate.