CN114935822A - Optical system - Google Patents
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- CN114935822A CN114935822A CN202210674100.7A CN202210674100A CN114935822A CN 114935822 A CN114935822 A CN 114935822A CN 202210674100 A CN202210674100 A CN 202210674100A CN 114935822 A CN114935822 A CN 114935822A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
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- G02B27/0172—Head mounted characterised by optical features
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Abstract
An optical system comprises a display screen capable of emitting light and an optical module, wherein the optical module comprises a first lens, a first phase delay plate, a linear polaroid, a semi-reflecting layer, a second phase delay plate, a reflecting polaroid and a second lens which are coaxially arranged along the light path, and the first phase delay plate, the linear polaroid and the semi-reflecting layer are attached to the first lens from the display screen to human eyes according to the arrangement mode of the linear polaroid, the first phase delay plate and the semi-reflecting layer, so that the first phase delay plate and the linear polaroid are bent along the curved surface shape of the first lens to generate the effect of bending display, thereby solving the light leakage phenomenon generated by the large visual angle alignment error of the edge of the conventional flat panel display in the optical lens and reducing the ghost image problem caused by the stray light.
Description
Technical Field
The present invention relates to the field of optical technology, and more particularly, to an optical system capable of improving light leakage at a large viewing angle and reducing ghost images.
Background
With the development of Augmented Reality (AR) and Virtual Reality (VR) technologies, the digital world which is formed by mixing Virtual Reality and Reality in science fiction novels and movies has been developed, and the development is more and more facilitated. As for the virtual reality technology, an optical system of an AR/VR head-mounted display device includes a display 1 and an optical module 2, as shown in fig. 1, the display 1 includes a display screen 10, and a linear polarizer (linear polarizer)11 and a phase retarder 12 sequentially attached to a surface of the display screen 10, so that light output by the display screen 10 is in a circular polarization state. The optical module 2 includes a half-reflecting layer (half-reflecting) 21, a first lens 22, a phase retarder 23, a reflective polarizer 24, a second lens 25, a linear polarizer 26, and other optical elements disposed in front of the display 1, so that the light output from the display 1 is reflected and phase-adjusted multiple times by the optical module 2 and then guided to the human eye 5, and the original longer light path is greatly shortened, so that the overall volume of the optical system can be minimized.
However, the edge of the flat panel display in the AR/VR head-mounted display device is prone to large viewing angle light leakage in the optical lens. As shown in fig. 2A, the ideal polarization alignment condition assumes that the phase retarder 12 and the phase retarder 23 are both flat. However, the display is generally planar, while the optical lens is curved. Thus, the true polarization angle alignment is shown in FIG. 2B. The retarder 12 is disposed in the display to present a flat surface, and the retarder 23 is disposed in the optical module to present a curved surface. Since the shapes of the two have curvature difference, the polarization angles cannot be aligned effectively, and light leakage is caused. In addition, part of light reflected back to the display through the semi-reflective layer for the first time is easy to generate stray light with a mechanism part of the AR/VR head-mounted display equipment, and then the stray light is projected into the optical module to generate ghost, and the external stray light is easy to directly enter the optical module, so that the ghost problem is caused.
Disclosure of Invention
The present invention is directed to an optical system, in which a linear polarizer and a retarder are attached to a surface of a first lens, and the first lens can be curved along a curved surface of the first lens, so as to avoid light leakage caused by large viewing angle alignment error of the edge of a conventional flat panel display in an optical lens, and further reduce the ghost image caused by stray light.
To achieve the above objective, the present invention provides an optical system, which includes a display screen and an optical module. The display screen is used for outputting images and emitting light. The optical module comprises the following elements arranged coaxially along the path of the light: the first lens is arranged opposite to the display screen and comprises an outer curved surface facing the display screen and an inner curved surface back to the display screen; the first phase delay piece is attached to the outer curved surface of the first lens; the linear polaroid is attached to one surface, facing the display screen, of the first phase retarder; the semi-reflecting layer is arranged between the inner curved surface of the first lens or the first phase retarder and the outer curved surface of the first lens; a second phase retarder disposed opposite to the semi-reflective layer and the first lens; a reflective polarizer disposed opposite the second phase retarder; and a second lens disposed opposite to the reflective polarizer.
According to an embodiment of the present invention, the outer curved surface and the inner curved surface of the first lens have the same or similar curvatures.
According to an embodiment of the present invention, the linear polarizer receives light emitted from the display panel and forms a first linearly polarized light, the first linearly polarized light is converted into a first circularly polarized light by the first phase retarder, and a part of the first circularly polarized light is reflected back to the display panel after penetrating through the semi-reflective layer.
According to an embodiment of the present invention, the second phase retarder receives the first circularly polarized light and converts the first circularly polarized light into a second linearly polarized light, the second linearly polarized light is reflected by the reflective polarizer, so that the second circularly polarized light is converted into a second circularly polarized light by the second phase retarder, a part of the second circularly polarized light penetrates through the semi-reflective layer, a part of the second circularly polarized light is converted into a third circularly polarized light and is reflected back to the second phase retarder, so as to convert the third circularly polarized light into a third linearly polarized light, and the third circularly polarized light penetrates through the reflective polarizer and is then introduced into the human eye through the second lens.
According to an embodiment of the present invention, the fast axis of the first retardation plate and the fast axis of the second retardation plate are parallel to each other.
The invention also provides an optical system, which comprises a display screen and an optical module. The display screen is used for outputting images and emitting light. The optical module comprises the following elements arranged coaxially along the path of the light: the first lens is arranged opposite to the display screen and comprises an outer curved surface facing the display screen and an inner curved surface back to the display screen; the first phase delay piece is attached to the inner curved surface of the first lens; a linear polarizer attached to the outer curved surface of the first lens; the semi-reflecting layer is arranged on one surface of the first phase delay plate, which faces away from the display screen; a second phase delay plate arranged opposite to the semi-reflecting layer; a reflective polarizer disposed opposite the second phase retarder; and a second lens disposed opposite to the reflective polarizer.
According to an embodiment of the present invention, the outer curved surface and the inner curved surface of the first lens have the same or similar curvature.
According to an embodiment of the present invention, the curvature difference between the outer curved surface and the inner curved surface of the first lens is within 30%.
According to an embodiment of the present invention, the linear polarizer receives light emitted from the display panel and forms a first linearly polarized light, the first linearly polarized light is guided into the first phase retarder through the first lens and converted into a first circularly polarized light, and a portion of the first circularly polarized light penetrates through the semi-reflective layer and a portion of the first circularly polarized light is reflected back to the display panel.
According to an embodiment of the present invention, the second phase retarder receives the first circularly polarized light penetrating through the semi-reflective layer and converts the first circularly polarized light into a second linearly polarized light, the second linearly polarized light is reflected by the reflective polarizer, so that the second circularly polarized light is converted into a second circularly polarized light by the second phase retarder, the second circularly polarized light partially penetrates through the semi-reflective layer, and a portion of the second circularly polarized light is converted into a third circularly polarized light and reflected back to the second phase retarder, so as to convert the third circularly polarized light into a third linearly polarized light, which then penetrates through the reflective polarizer and is then introduced into human eyes through the second lens.
According to the embodiment of the present invention, the fast axis of the first phase retarder and the fast axis of the second phase retarder are parallel to each other.
Compared with the prior art, the invention has the following advantages:
(1) the invention can overcome the light leakage problem caused by the large visual angle alignment error of the edge of the conventional flat panel display in the optical lens.
(2) The invention can eliminate the stray light reflected by the optical module and the external stray light, thereby improving the ghost problem generated by the conventional optical system.
The purpose, technical content, features and effects of the present invention will be more readily understood through the detailed description of the embodiments below.
Drawings
FIG. 1 is a schematic layout diagram of an optical system of an AR/VR head-mounted display device in the prior art.
FIG. 2A is a schematic diagram of the ideal polarization angle alignment of the two phase retarders in FIG. 1.
FIG. 2B is a diagram illustrating the true polarization angle alignment of the two retarders in FIG. 1
FIG. 3 is a cross-sectional view of an optical system according to a first embodiment of the present invention.
FIG. 4 is a cross-sectional view of an optical system according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of an optical system according to a third embodiment of the present invention.
FIG. 6 is a diagram illustrating a stray light region of the optical system of the present invention.
The reference signs are:
1: the display 44: first lens
10: display screen 441: outer curved surface
11: linear polarizer 442: inner curved surface
12: phase retarder 45: second phase delay plate
2: the optical module 46: reflective polarizer
21: semi-reflective layer 47: second lens
22: first lens 5: human eye
23: phase retarder a: stray light region
24: reflective polarizer B: stray light region
25: second lens
26: linear polarizer
3: display screen
4: optical module
41: linear polarizer
42: first phase retarder
43: semi-reflective layer
Detailed Description
Embodiments of the invention will be further explained by the following description in conjunction with the related drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. In the drawings, the shape and thickness may be exaggerated for simplicity and convenience. It is to be understood that elements not specifically shown in the drawings or described in the specification are in a form known to those skilled in the art. One of ordinary skill in the art can make various changes and modifications based on the disclosure of the present invention.
Fig. 3 is a cross-sectional view of an optical system according to a first embodiment of the present invention. The optical system of the present embodiment is applied to an AR/VR head-mounted display device, which includes a display screen 3 and an optical module 4, which are disposed opposite to each other. The display 3 is used for outputting images and emitting light to the optical module 4, and then the light is guided into the human eyes 5 through the optical module 4 for imaging. The optical module 3 includes a linear polarizer 41, a first phase retarder 42, a first lens 43, a semi-reflective layer 44, a second phase retarder 45, a reflective polarizer 46, and a second lens 47, which are coaxially disposed along the path of light. The first lens 44 is disposed opposite to the display panel 3, the first lens 44 includes an outer curved surface 441 facing the display panel 3 and an inner curved surface 442 facing away from the display panel 3, and the semi-reflective layer 43, the first phase retarder 42 and the linear polarizer 41 are sequentially attached to the outer curved surface 441 of the first lens 44, that is, the linear polarizer 41, the first phase retarder 42 and the semi-reflective layer 43 are sequentially disposed between the display panel 3 and the first lens 44. And a second phase retarder 45 is disposed opposite the first lens 44. A reflective polarizer 46 is arranged opposite the second phase retarder 45. To explain, in this embodiment, the semi-reflective layer 43, the first phase retarder 42 and the linear polarizer 41 are integrally disposed on the first lens 44 by coating, plating or bonding, so that the first phase retarder 42 and the linear polarizer 41 can be bent to follow the shape of the outer curved surface 441 of the first lens 44. As shown in fig. 4, since the first phase retarder 42 and the second phase retarder 45 are both disposed inside the optical module 4, the shapes of the two are the same or similar to each other, so that the polarization angles of the light beams can be aligned effectively, and the light leakage phenomenon can be avoided.
In the present invention, the display screen 3 may be an LCD display screen, an LED display screen, an electronic paper display screen, or an OLED display screen. The light emitted from the display 3 may be polarized light or unpolarized light, and the polarized light is not limited to a polarization direction, for example, the polarized light may be linearly polarized light, circularly polarized light or other polarization state, and the polarization direction of the linearly polarized light cannot be the same as the absorption axis of the linear polarizer 41 so as to avoid being completely absorbed by the linear polarizer 41; in this embodiment, the light emitted from the display 3 is unpolarized light. In the present invention, the linear polarizer 41 is used to receive the light emitted from the display 3 and make the light pass through to become linearly polarized light, the linear polarizer 41 used in the present invention may be a vertical polarizer or a horizontal polarizer, the penetrating axis of the vertical polarizer is perpendicular to the light path, the absorbing axis is parallel to the light path, the penetrating axis of the horizontal polarizer is parallel to the light path, and the absorbing axis is perpendicular to the light path; the linear polarizer 41 of this embodiment is a vertical polarizer, which only provides the linearly polarized light with the polarization direction perpendicular to the light path to pass through, but the light with the other polarization direction cannot pass through. In the present invention, the first phase retardation plate 42 is used to receive the light passing through the linear polarizer 41 and perform phase retardation; the first retardation plate 42 of the present embodiment is a quarter-wave plate, which can increase the retardation of a quarter-wave. In the present invention, the semi-reflective layer 43 is used to receive the light passing through the first phase retardation plate 42, and make the light partially penetrate the semi-reflective layer 43, partially reflect and make the phase of the reflected light converted by 180 degrees; the semi-reflective layer 43 of this embodiment is for 50% light transmission and 50% light reflection. In the present invention, the second phase retardation plate 45 is used to receive the light passing through the semi-reflective layer 43 and perform phase retardation; the second phase retardation plate 45 of the present embodiment is a quarter-wave plate, which can increase the phase retardation of a quarter-wave. In this embodiment, the fast axis of the first retardation plate 42 and the fast axis of the second retardation plate 45 are disposed parallel to each other to increase the optical efficiency. A reflective polarizer 46 for receiving the light passing through the second phase retarder 45 and partially transmitting and partially reflecting the light; the reflective polarizer 46 of this embodiment is used to only provide the linearly polarized light with the polarization direction perpendicular to the light path to pass through, and reflect the light with the other polarization direction.
In the present invention, the outer curved surface 441 and the inner curved surface 442 of the first lens element 44 preferably have the same or similar curvatures, and more specifically, the difference between the curvatures of the outer curved surface 441 and the inner curved surface 442 of the first lens element 44 is preferably within 30%, which makes the axial alignment more accurate. The types of the first lens 44 and the second lens 47 of the present invention are not limited, and can be, for example, a single-chip lens such as a spherical lens, an aspherical lens, a Fresnel lens, or a multi-chip lens combining any of the above. The present invention mainly combines the semi-reflective layer 43, the first phase retardation plate 42 and the linear polarizer 41 with the first lens 44 into a whole, and further, other layers can be added between the semi-reflective layer 43, the first phase retardation plate 42 and the linear polarizer 41, for example, one or more linear polarizers, circular polarizers or phase retardation plates can be added, and the materials of the linear polarizers, the circular polarizers and the phase retardation plates can be thin film materials or optical coatings, which can be arranged on the first lens 44 in a coating, coating or bonding manner. It should be noted that, as long as the folding optical effect of the first phase retarder 42, the linear polarizer 41, the second phase retarder 45, the reflective polarizer 46, and the second lens 47 and the semi-reflective layer 43 on the first lens 44 can be achieved, it is within the scope of the present invention that any one of the first phase retarder 42, the linear polarizer 41, the second phase retarder 45, the reflective polarizer 46, and the second lens 47 can be replaced by other folding polarizing film, optical lens, or other similar functional elements that diffract optical or DOE, as long as the folding optical effect is achieved by the first phase retarder 42, the linear polarizer 41, the second phase retarder 45, the reflective polarizer 46, and the second lens 47, and the semi-reflective layer 43 on the first lens 44.
Further illustrate the specific operation flow of this embodiment. Firstly, the display screen 3 outputs an image and emits unpolarized light to the linear polarizer 41, and the unpolarized light passes through the linear polarizer 41 and becomes first linearly polarized light; the first linearly polarized light is vertically polarized light. After receiving the first linearly polarized light, the first phase delay plate 42 converts the first linearly polarized light into a first circularly polarized light; the first circularly polarized light is right-circularly polarized light. After receiving the first circularly polarized light, the semi-reflective layer 43 transmits 50% of the first circularly polarized light through the semi-reflective layer 43, and then the first circularly polarized light is guided out through the first lens 44, and the other 50% of the first circularly polarized light is reflected back to the display screen 3. The second phase delay plate 45 receives the first circularly polarized light guided out by the first lens 44, and converts the first circularly polarized light into a second linearly polarized light; the second linearly polarized light is horizontally polarized light. The reflective polarizer 46 receives the second linearly polarized light and reflects it back to the second phase retarder 45. Then, the second phase retardation plate 45 converts the second linearly polarized light into second circularly polarized light; the second circularly polarized light is right-circularly polarized light. The second circularly polarized light passes through the semi-reflective layer 43, so that 50% of the second circularly polarized light penetrates through the semi-reflective layer 43, and the other 50% of the second circularly polarized light is converted into third circularly polarized light by 180 degrees and reflected back to the second phase retardation plate 45; the third circularly polarized light is left-handed polarized light. The second phase retardation plate 45 converts the third circularly polarized light into third linearly polarized light; the third linearly polarized light is vertically polarized light. Finally, the reflective polarizer 46 allows the third linearly polarized light to pass directly through and be guided into the human eye 5 by the second lens 47.
Fig. 4 is a cross-sectional view of an optical system according to a second embodiment of the present invention. The difference from the first embodiment is that the semi-reflective layer 43 is attached to the inner curved surface 442 of the first lens 44, and the first phase retardation plate 42 and the linear polarizing plate 41 are sequentially attached to the outer curved surface 441 of the first lens 44, that is, the linear polarizing plate 41 and the first phase retardation plate 42 are sequentially disposed between the display 3 and the first lens 44, and the semi-reflective layer 43 is disposed between the first lens 44 and the second phase retardation plate 45. Similarly, in this embodiment, the semi-reflective layer 43, the first retardation film 42 and the linear polarizer 41 are integrally coated, coated or bonded on the first lens 44, so that the first retardation film 42 and the linear polarizer 41 can be bent to follow the shape of the outer curved surface 441 of the first lens 44. Because the first phase retarder 42 and the second phase retarder 45 are both disposed in the optical module 4, the shapes of the first phase retarder and the second phase retarder have the same or similar curvatures, so that the polarization angles of the light can be effectively aligned, and the light leakage phenomenon can be avoided.
Further illustrate the specific operation flow of this embodiment. Firstly, the display 3 outputs an image and emits unpolarized light to the linear polarizer 41, and the unpolarized light passes through the linear polarizer 41 and then becomes first linearly polarized light; the first linearly polarized light is vertically polarized light. After receiving the first linearly polarized light, the first phase delay plate 42 converts the first linearly polarized light into a first circularly polarized light, and then passes through the first lens 44; the first circularly polarized light is right-circularly polarized light. The semi-reflective layer 43 receives the first circularly polarized light passing through the first lens 44, and then 50% of the first circularly polarized light passes through the semi-reflective layer 43, and the other 50% is reflected back to the display 3. The second phase retarder 45 receives the first circularly polarized light transmitted through the semi-reflective layer 43 and converts the first circularly polarized light into a second linearly polarized light; the second linearly polarized light is horizontally polarized light. The reflective polarizer 46 receives the second linearly polarized light and reflects it back to the second phase retarder 45. Then, the second linearly polarized light is converted into second circularly polarized light by the second phase delay 45 pieces; the second circularly polarized light is right-circularly polarized light. The second circularly polarized light passes through the semi-reflective layer 43, so that 50% of the second circularly polarized light penetrates through the semi-reflective layer 43, and the other 50% of the second circularly polarized light is converted into third circularly polarized light and reflected back to the second phase delay plate 45; the third circularly polarized light is left-handed polarized light. The second phase retardation plate 45 converts the third circularly polarized light into third linearly polarized light; the third linearly polarized light is vertically polarized light. Finally, the reflective polarizer 46 allows the third linearly polarized light to pass directly through and be guided into the human eye 5 by the second lens 47.
Fig. 5 is a cross-sectional view of an optical system according to a third embodiment of the present invention. The difference between the first and second embodiments is that in the present embodiment, the linear polarizer 41 is attached to the outer curved surface 441 of the first lens 44, and the first phase retarder 42 and the semi-reflective layer 43 are sequentially attached to the inner curved surface 442 of the first lens 44, that is, the linear polarizer 41 is disposed between the display panel 3 and the first lens 44, and the first phase retarder 42 and the semi-reflective layer 43 are disposed between the first lens 44 and the second phase retarder 45. Similarly, in this embodiment, the semi-reflective layer 43, the first phase retarder 42 and the linear polarizer 41 are integrally disposed on the first lens 44 by coating, plating or bonding, so that the first phase retarder 42 and the linear polarizer 41 can be bent to follow the shapes of the outer curved surface 441 and the inner curved surface 442 of the first lens 44. Because the first phase retarder 42 and the second phase retarder 45 are both disposed in the optical module 4, the shapes of the first phase retarder and the second phase retarder have the same or similar curvatures, so that the polarization angles of the light can be effectively aligned, and the light leakage phenomenon can be avoided.
Further illustrate the specific operation flow of this embodiment. Firstly, the display screen 3 outputs an image and emits unpolarized light to the linear polarizer 41, and the unpolarized light passes through the linear polarizer 41 and becomes first linearly polarized light; the first linearly polarized light is vertically polarized light and passes through the first lens 44. The first phase retarder 43 receives the first linearly polarized light passing through the first lens 44 and converts the first linearly polarized light into first circularly polarized light; the first circularly polarized light is right-circularly polarized light. After the semi-reflective layer 43 receives the first circularly polarized light, 50% of the first circularly polarized light is transmitted through the semi-reflective layer 43, and the other 50% is reflected back to the display 3. The second phase retarder 45 receives the first circularly polarized light transmitted through the semi-reflective layer 43 and converts the first circularly polarized light into a second linearly polarized light; the second linearly polarized light is horizontally polarized light. The reflective polarizer 46 receives the second linearly polarized light and reflects it back to the second phase retarder 45. Then, the second phase retardation plate 45 converts the second linearly polarized light into second circularly polarized light; the second circularly polarized light is right-circularly polarized light. The second circularly polarized light passes through the semi-reflective layer 43, so that 50% of the second circularly polarized light penetrates through the semi-reflective layer 43, and the other 50% of the second circularly polarized light is converted into third circularly polarized light and reflected back to the second phase delay plate 45; the third circularly polarized light is left-handed polarized light. The second phase retardation plate 45 converts the third circularly polarized light into third linearly polarized light; the third linearly polarized light is vertically polarized light. Finally, the reflective polarizer 46 allows the third linearly polarized light to pass directly through and be guided into the human eye 5 by the second lens 47.
In addition, fig. 6 is a schematic diagram of a stray light region of the optical system of the present invention. In the stray light region a: of the light passing through the semi-reflective layer 43, 50% of the light will penetrate through the semi-reflective layer 43, and the remaining 50% of the light reflected back will be absorbed by the linear polarizer 41, and will not generate stray light with the mechanism of the AR/VR head-mounted display device, and then be projected into the optical module 4 to generate ghost. In the stray light region B: external stray light passes through the semi-reflective layer 43, and 50% of the reflected light is also absorbed by the linear polarizer 41, so that the external stray light is the residual reflected light from the region a, and thus is a relatively small amount of stray light. Compared with the conventional optical system, the invention can effectively improve the ghost problem caused by stray light.
In summary, the optical system provided by the present invention combines the linear polarizer and the first phase retarder with the first lens according to the arrangement of the linear polarizer, the first phase retarder and the semi-reflective layer, so that the linear polarizer and the first phase retarder can be curved along the curved surface of the first lens, thereby generating a curved display effect, thereby avoiding light leakage caused by large viewing angle alignment error of the edge of the conventional flat panel display in the optical lens, and further eliminating stray light reflected by the optical module and stray light from the outside, thereby improving the ghost image problem caused by the conventional optical system. The invention is suitable for LCD displays, LED displays, electronic paper displays or OLED displays, and can achieve ideal optical efficiency without additionally arranging a polarizing film in the displays.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, the equivalent changes or modifications according to the features and spirit of the present invention should be included in the claims of the present invention.
Claims (12)
1. An optical system, comprising:
the display screen is used for outputting images and emitting light; and
an optical module comprising the following elements arranged coaxially along the path of said light rays:
the first lens is arranged opposite to the display screen and comprises an outer curved surface facing the display screen and an inner curved surface back to the display screen;
a first phase retarder attached to the outer curved surface of the first lens;
the linear polaroid is attached to one surface, facing the display screen, of the first phase retarder;
a semi-reflective layer disposed between the inner curved surface of the first lens or the first phase retarder and the outer curved surface of the first lens;
a second phase retarder disposed opposite the semi-reflective layer and the first lens;
a reflective polarizer disposed opposite the second phase retarder; and
and the second lens is arranged opposite to the reflective polarizer.
2. The optical system of claim 1 wherein said outer curved surface and said inner curved surface of said first lens have the same or similar curvature.
3. The optical system of claim 1 wherein said outer curved surface and said inner curved surface of said first lens have a difference in curvature that is within 30%.
4. An optical system as recited in claim 1, wherein said linear polarizer receives said light from said display screen and forms a first linearly polarized light that is converted to a first circularly polarized light by said first phase retarder, said first circularly polarized light partially passing through said semi-reflective layer and partially reflecting back to said display screen.
5. An optical system as recited in claim 4, wherein said second phase retarder receives said first circularly polarized light and converts it to a second linearly polarized light, said second linearly polarized light being reflected by said reflective polarizer such that said second linearly polarized light is converted to a second circularly polarized light by said second phase retarder, said second circularly polarized light partially passing through said semi-reflective layer and partially converted to a third circularly polarized light and reflected back to said second phase retarder to convert said third circularly polarized light to a third linearly polarized light, which is then re-passed through said reflective polarizer and directed into the human eye via said second lens.
6. The optical system of claim 1, wherein the fast axis of the first phase retarder and the fast axis of the second phase retarder are parallel to each other.
7. An optical system, comprising:
the display screen is used for outputting images and emitting light; and
an optical module comprising the following elements arranged coaxially along the path of said light rays:
the first lens is arranged opposite to the display screen and comprises an outer curved surface facing the display screen and an inner curved surface back to the display screen;
a first phase retarder attached to the inner curved surface of the first lens;
a linear polarizer attached to the outer curved surface of the first lens; and
the semi-reflecting layer is arranged on one surface, back to the display screen, of the first phase delay plate;
a second phase retarder disposed opposite the semi-reflective layer;
a reflective polarizer disposed opposite the second phase retarder; and
and the second lens is arranged opposite to the reflective polarizer.
8. The optical system of claim 7 wherein said outer curved surface and said inner curved surface of said first lens have the same or similar curvature.
9. The optical system of claim 7 wherein said outer curved surface and said inner curved surface of said first lens have a difference in curvature that is within 30%.
10. An optical system as recited in claim 7, wherein said linear polarizer receives said light from said display screen and forms a first linearly polarized light which is directed into said first phase retarder through said first lens and converted to a first circularly polarized light which is partially transmitted through said semi-reflective layer and partially reflected back toward said display screen.
11. The optical system of claim 10 wherein said second phase retarder receives said first circularly polarized light transmitted through said semi-reflective layer and converts it to a second linearly polarized light, said second linearly polarized light is reflected by said reflective polarizer such that said second linearly polarized light is converted to a second circularly polarized light by said second phase retarder, said second circularly polarized light partially penetrates said semi-reflective layer and partially converts it to a third circularly polarized light which is reflected back to said second phase retarder such that said third circularly polarized light is converted to a third linearly polarized light which is then transmitted through said reflective polarizer and then directed into the human eye through said second lens.
12. The optical system of claim 7, wherein the fast axis of the first phase retarder and the fast axis of the second phase retarder are parallel to each other.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210674100.7A CN114935822A (en) | 2022-06-15 | 2022-06-15 | Optical system |
| TW111122634A TWI823428B (en) | 2022-06-15 | 2022-06-17 | Optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210674100.7A CN114935822A (en) | 2022-06-15 | 2022-06-15 | Optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114935822A true CN114935822A (en) | 2022-08-23 |
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| CN202210674100.7A Pending CN114935822A (en) | 2022-06-15 | 2022-06-15 | Optical system |
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| TW (1) | TWI823428B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116538952A (en) * | 2023-05-04 | 2023-08-04 | 业成科技（成都）有限公司 | Measuring device and method for multilayer film |
| TWI838140B (en) * | 2023-02-24 | 2024-04-01 | 新鉅科技股份有限公司 | Optical lens assembly and head-mounted electronic device |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI823428B (en) | 2023-11-21 |
| TW202401090A (en) | 2024-01-01 |
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