CN112965330A - Projection assembly, projector and display system - Google Patents
Projection assembly, projector and display system Download PDFInfo
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- CN112965330A CN112965330A CN202110407428.8A CN202110407428A CN112965330A CN 112965330 A CN112965330 A CN 112965330A CN 202110407428 A CN202110407428 A CN 202110407428A CN 112965330 A CN112965330 A CN 112965330A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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Abstract
The invention provides a projection assembly, a projector and a display system. A projection assembly, comprising: a light source; the first display panel is arranged on one side of the light source and used for converting light rays emitted by the light source into two groups of polarized light with preset polarization directions; the second display panel is arranged on one side, far away from the light source, of the first display panel and is used for deflecting one of the two groups of polarized light emitted by the first display panel to enable the polarization directions of the two groups of polarized light to be different; and the birefringent crystal is arranged on one side of the second display panel, which is far away from the light source, and is used for refracting the two groups of polarized light emitted by the second display panel according to different refractive indexes, so that the effect of pixel point deviation of projection of the two groups of polarized light is realized, and the resolution of a projection picture is improved.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to a projection assembly, a projector and a display system.
Background
Currently, 4K projectors are mainly classified into native 4K chip UHD (Ultra High Definition) projectors and non-native 4K chip UHD projectors. The original 4K chip UHD projector is expensive and the entire projector is large in size, and adopts a 3LCD (three-chip liquid crystal display) projection technology or a DLP (Digital Light Processing) projection display technology. The non-native 4K chip UHD projector mainly uses XPR technology at present, and moves back and forth diagonally through a Micromirror on a DMD (Digital Micromirror Device) chip at a refresh rate of 120Hz, and shifts a new round of pictures by half a pixel right up or right down on the basis of the projection of the original 2716 × 1528 pictures, thereby realizing "pixel replication". In addition, double "pixel replication" can also be achieved with the original 1920 by 1080 picture projection by moving micromirrors on the DMD chip horizontally and vertically in four directions at a refresh rate of 240 Hz. Both of these ways can achieve the effect of improving the resolution.
However, when the XPR technology realizes high-resolution projection by "dithering", a flicker or rainbow-like pattern phenomenon appears on a specific projection picture, and the display effect is poor, but the picture sharpness and the 2K picture are improved, but there is still a certain gap with the original 4K picture.
Disclosure of Invention
The invention provides a projection assembly, a projector and a display system, aiming at solving the problems of poor picture quality such as picture jitter, rainbow stripes and the like of non-native 4K projection equipment.
In a first aspect, an embodiment of the present invention provides a projection assembly, including:
a light source;
the first display panel is arranged in front of the light source and used for converting light rays emitted by the light source into two groups of polarized light with preset polarization directions;
the second display panel is arranged on one side of the first display panel and is used for deflecting one of the two groups of polarized light emitted by the first display panel to enable the polarization directions of the two groups of polarized light to be different;
and the birefringent crystal is arranged on one side of the second display panel far away from the light source (14) and is used for refracting the two groups of polarized light emitted by the second display panel according to different refractive indexes.
In some embodiments, the projection assembly further comprises:
the first lens is arranged between the light emitting side of the light source and the first display panel and is used for modulating the light emitted by the light source into approximately collimated light;
and the second lens is arranged on the light emergent side of the birefringent crystal and is used for converging the light rays emitted by the birefringent crystal.
In some embodiments, the projection assembly further comprises:
and the projection lens is used for projecting the emergent light of the second lens.
In some embodiments, the birefringent crystal refracts two groups of polarized light emitted from the second display panel according to different refractive indexes, so that the projection of the two groups of polarized light deviates on a normal plane of light by no more than half of the pixel point width.
In some embodiments, the second display panel is configured to deflect one of the two sets of polarized light emitted by the first display panel by 90 °.
In some embodiments, in the images displayed by the two sets of polarized light emitted from the first display panel, the display time difference between two adjacent frames of images is a preset time length, so that the two adjacent frames of images are alternately incident on the second display panel.
In some embodiments, the refresh rates of the first display panel and the second display panel are the same.
In some embodiments, the second display panel is an LCD display panel having a polarizing effect.
In some embodiments, the birefringent crystal is at an angle to an exit light normal plane of the second display panel.
In some embodiments, the angle ranges from 0 ° to 90 °.
In some embodiments, the first display panel and the second display panel are spaced apart or integrally disposed.
In a second aspect, an embodiment of the present invention provides a projector, including the projection assembly according to the first aspect.
In a third aspect, an embodiment of the present invention provides a display system, including:
the projection assembly of the first aspect or the projector of the second aspect;
and the projection curtain is used for projecting the emergent light of the birefringent crystal to form a projection picture.
One or more embodiments of the invention have at least the following beneficial effects:
according to the projection assembly, the projector and the display system provided by the embodiment of the invention, the light emitted by the light source is converted into two groups of polarized light with preset polarization directions through the first display panel arranged in front of the light source, and then one group of polarized light in the two groups of polarized light emitted by the first display panel is deflected through the second display panel arranged on one side, far away from the light source, of the first display panel, so that the polarization directions of the two groups of polarized light are different, and the two groups of polarized light emitted by the second display panel are refracted according to different refractive indexes by further utilizing the birefringent crystal arranged on one side, far away from the light source, of the second display panel, so that the effect of pixel point deviation of projection of the two groups of polarized light is realized, and the resolution of a projection.
The projection component, the projector and the display system provided by the embodiment of the invention are based on the principle of single LCD projection, have simple structure and lower cost, can realize high-resolution projection display through a set of optical path system, can reduce the size of an optical machine, reduce the cost, solve the problem that the optical machine of a native 4K projection device and a projection device above 4K is large in size and complex and inconvenient to carry, simultaneously solve the problem that the cost of the native 4K projection device and the non-native 4K projection device is high and the problem that the non-native 4K projection device realizes high-resolution projection through 'shaking', and further solve the problem of poor image quality such as shaking, rainbow lines and the like caused by the fact that pictures of the non-native 4K projection device realize high-resolution projection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a projection module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a polarization principle provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical path of a birefringent crystal provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of arrangement of pixel points of a projection image according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 shows a schematic structural diagram of a projection assembly, and the embodiment provides a projection assembly, including:
a light source 14;
a first display panel 15 disposed at one side of the light source 14, for converting the light emitted from the light source 1 into polarized light with a predetermined polarization direction;
the second display panel 16 is disposed on a side of the first display panel 15 away from the light source 14, and is configured to deflect one of the two sets of polarized light emitted from the first display panel 15, so that the two sets of polarized light have different polarization directions;
and the birefringent crystal 3 is arranged on one side of the second display panel 16 far away from the light source 14, and is used for refracting the two groups of polarized light emitted by the second display panel 16 according to different refractive indexes.
In practical application, the light source 14 may be an LED light source and is located at the tail of the whole projection assembly, the light-gathering cup 13 is further disposed in front of the light source 14, and the light-gathering cup 13 is connected with the LED light source and used for gathering light of the LED light source, so that the utilization rate of the light source is improved.
The first display panel 15 is an LCD display panel, which includes an upper polarizer 7, a color film 8, a liquid crystal cell 9, a TFT substrate 10, and a lower polarizer 11, and is fixedly connected in sequence, and is a TN liquid crystal display panel for a single LCD projector, and is an important component for realizing display of a projection image.
The second display panel 16 is an LCD display panel with polarization, and includes a transparent glass 4, a TFT substrate 6, and a liquid crystal cell 5 formed by sealing the transparent glass 4 and the TFT substrate 6, compared with the first display panel 15, the second display panel 16 does not include an upper polarizer, a lower polarizer, and a color film, and has polarization, and can deflect one of two sets of polarized light emitted from the first display panel 15, so that the two sets of polarized light have different polarization directions, and the liquid crystal cell 5 deflects pictures with high refresh rate at intervals, thereby realizing the difference in polarization directions of the two sets of polarized light. In practical applications, when the first display panel 15 and the second display panel 16 are integrally disposed, the second display panel 16 may be attached in front of the first display panel 15, and the routing layer of the first display panel 15 may be integrated on the color film, integrated on the upper polarizer POL, or fixedly connected to the upper polarizer POL, so as to further reduce the thickness of the projection module and reduce the size of the optical engine under the condition of integral disposition. When the first display panel 15 and the second display panel 16 are disposed at an interval, the second display panel 16 may be disposed at a certain distance in front of the first display panel 15, and the interval is favorable for heat dissipation between the first display panel 15 and the second display panel 16. The two display panels are arranged in the front and back direction, installation modes such as attachment and interval can be adopted, high-resolution projection display can be realized only by one set of light path system, the size of the optical machine can be reduced, and the cost is reduced.
In some embodiments, the projection assembly further comprises:
the first lens 12 is arranged between the light emitting side of the light source 14 and the first display panel 15 and is used for modulating the light emitted by the light source 14 into approximately collimated light;
and the second lens 2 is arranged on the light emergent side of the birefringent crystal 3 and is used for converging the light rays emitted by the birefringent crystal 3.
In practical application, the first lens 12 and the second lens 2 may be fresnel lenses. The first display panel 15 may be fixedly connected to the front of the first lens 12 at a distance, which is beneficial to heat dissipation of the projection assembly or the projector.
Fig. 2 shows a schematic diagram of the principle of polarization. The second display panel 16 alternately displays the polarized light with the same polarization direction emitted from the first display panel 15 as two sets of pictures, and the polarization direction of the two sets of polarized light emitted from the first display panel 15 is the same as the light-emitting angle of the upper polarizer of the first display panel 15, and deflects one of the two sets of polarized light emitted from the first display panel 15 by 90 ° according to the refresh rate, so that the two sets of polarized light have different polarization directions and become two sets of alternately displayed mutually perpendicular polarized light. As shown in fig. 2, the light ray a emitted from the light source 14 is polarized light perpendicular to each other, and is converted into polarized light in one direction by filtering of the lower polarizer 11 of the first display panel 15, and is then passed through the polarization effect of the liquid crystal cell 9 to rotate the polarization direction by 90 °, and is emitted from the upper polarizer 7 to enter the TFT substrate 6 of the second display panel 16, and is converted into polarized light b which is alternately displayed and has a perpendicular polarization direction by the alternate polarization effect of the liquid crystal cell 5 above the TFT substrate 6.
The refresh rates of the first display panel 15 and the second display panel 16 are the same. In the two sets of polarized lights emitted from the first display panel 15, the display time difference between two adjacent frames of pictures is a preset time (e.g., 1/120s), so that the two adjacent frames of pictures are alternately emitted to the second display panel 16, and the two sets of pictures are displayed on the same screen at the same time. In practical applications, the refresh rate of the first display panel 15 and the second display panel 16 may be greater than or equal to 120Hz, and a good high-resolution projection display effect may be achieved. Correspondingly, two groups of polarized light intervals 1/120s with the same polarization direction emitted by the first display panel 15 alternately display pictures, and are further converted into two groups of pictures alternately displayed at intervals 1/120s with mutually vertical polarization directions through the polarization effect of the second display panel 16, the two groups of polarized light are incident to the birefringent crystal 3, and the birefringent crystal 3 refracts the two groups of polarized light emitted by the second display panel 16 according to different refractive indexes, so that the projection of the two groups of polarized light realizes the pixel interleaving effect, the resolution of the projected pictures is improved, and the problems of picture jitter, rainbow stripes and the like are effectively prevented.
In some embodiments, the birefringent crystal 3 is mounted on the second display panel 16 at a side away from the light source 14 and behind the second lens 2, and the mounting position of the birefringent crystal 3 is at an angle with respect to the normal plane of the outgoing light of the second display panel 16, and the angle may be in a range of 0 ° to 90 °. In practical applications, the angle can be determined by those skilled in the art according to parameters such as projection distance, picture size, resolution size, etc., and the angle can be 45 ° or 60 °, but is not limited to these two angles.
In some embodiments, the birefringent crystal 3 refracts the two sets of polarized light emitted from the second display panel 16 according to different refractive indexes, so that the projections of the two sets of polarized light are shifted on the normal plane of the light by no more than half of the pixel point width.
The birefringent crystal is an anisotropic crystal having only a single optical axis, and has a characteristic that refractive indexes of polarized light in different polarization directions are different. Since the birefringent crystal has only one optical axis inside, the birefringence phenomenon occurs inside, and the birefringent crystal may be, but is not limited to, a calcite crystal. As shown in fig. 3, the birefringence phenomenon is that the refractive indexes of the polarized light c (i.e. the ordinary light o and the extraordinary light e) incident in the direction perpendicular to the optical axis and parallel to the optical axis are different in the birefringent crystal 3, and by the birefringence phenomenon, the o light and the e light can be refracted in the birefringent crystal according to different refractive indexes, and the o light and the e light are emitted out at the pixel difference Δ where the dislocation on the emitting surface does not exceed half the pixel width, so that the purpose of improving the resolution by the pixel dislocation is achieved.
In some embodiments, the projection assembly further comprises:
and the projection lens 1 is used for projecting the emergent light of the second lens 2.
Specifically, the second lens 2 located in front of the birefringent crystal 3 converges the emergent light of the birefringent crystal 3 onto the projection lens 1 located in front of the projection apparatus, and the projection lens 1 projects the emergent light of the second lens 2.
In one example, to achieve the high resolution projection display effect, the refresh rate of the first display panel 15 is 120Hz, two sets of pictures are alternately displayed within 120Hz, the polarization directions of two sets of polarized light emitted from the first display panel 15 are the same, and the light emitting angle of the upper polarizer 7 of the first display panel 15 is the same, but the display time of each frame of picture in the pictures displayed by the two sets of polarized light is 1/120s, the two sets of polarized light are alternately emitted into the second display panel 16 with polarization effect, the refresh rate of the second display panel 16 is also 120Hz, the polarized light incident within 1/120s next can be deflected by 90 ° every 1/60s, so that only one of the two sets of polarized light can be deflected by 90 ° without affecting the other set of polarized light. At this time, the projections of the two polarized lights on the normal plane of the second display panel 16 coincide, but the polarization directions of the two polarized lights are different, and the arrival times are in an alternating relationship. Two sets of polarized light of different polarization directions refract according to the refractive index refraction of birefringent crystal 3 respectively, make the projection of two sets of polarized light on the normal plane of light skew the distance (namely 1 ~ 715um) that is not more than half pixel point width, as shown in fig. 4, crisscross width and skew direction can be multiple, as long as satisfy on two sets of pictures the coincidence area of same pixel point be greater than this pixel point with the coincidence area of adjacent pixel point can. The projected pixel points of the two groups of polarized light are staggered, so that the resolution can be doubled, for example, a 2K picture can be changed into a 4K picture, and a 4K picture can also be changed into an 8K picture, but the two application scenarios are not limited to. The interlaced pictures are converged to the projection lens 1 through the second lens 2, and then projected to the curtain through the projection lens 1, so that high-resolution projection display is realized.
Example two
The embodiment provides a projector, which comprises the projection assembly in the first embodiment.
In the above projector, since the projection module of the first embodiment is adopted, the first display panel 15 converts the light emitted from the light source 1 into two sets of polarized lights in the preset polarization direction, the second display panel 16 deflects one of the two sets of polarized lights emitted from the first display panel 15, so that the two sets of polarized lights have different polarization directions, and the birefringent crystal 3 refracts the two sets of polarized lights emitted from the second display panel 16 according to different refractive indexes, thereby realizing the effect of pixel point interlacing.
In practical applications, the projector may include, but is not limited to, a 4K projector.
In this projecting apparatus, based on first display panel 15 and the light-emitting characteristic of second display panel 16 that has the polarization, convert the light of light source 1 outgoing into two sets of polarized light of predetermineeing the polarization direction, reuse birefringent crystal 3's birefringence characteristic, refraction polarization direction mutually perpendicular's two sets of polarized light realize the skew of projection pixel to promote the resolution ratio that the projection shows.
EXAMPLE III
The present embodiment provides a display system, including:
the projection assembly of embodiment one or the projector of embodiment two;
and the projection curtain is used for projecting the emergent light of the birefringent crystal 3 to form a projection picture.
In this embodiment, the light emitted from the light source 1 is converted into two sets of polarized lights in the predetermined polarization direction, and the light emitted from the birefringent crystal 3 is projected onto the projection screen by using the birefringence, so that the high-resolution projection display can be realized.
In summary, in the projection assembly, the projector and the display system provided in the embodiments of the present invention, the first display panel disposed in front of the light source converts the light emitted from the light source into two sets of polarized light with the same preset polarization direction, and the second display panel disposed in front of the first display panel deflects one of the two sets of polarized light emitted from the first display panel, so that the two sets of polarized light have different polarization directions, and the birefringent crystal disposed in front of the second display panel is further used to refract the two sets of polarized light emitted from the second display panel according to different refractive indexes, so as to achieve the effect of shifting the projected pixel points of the two sets of polarized light, thereby improving the resolution of the projection image.
The projection component, the projector and the display system provided by the embodiment of the invention are based on the principle of single LCD projection, have simple structure and lower cost, can realize high-resolution projection display through one set of optical path system, can reduce the size of an optical machine, reduce the cost, solve the problem that the optical machine of a native 4K projection device and a projection device above 4K is large in size and complex and inconvenient to carry, simultaneously solve the problem that the cost of the native 4K projection device and the projection device above 4K is high, and also solve the problem of poor image quality such as jitter and rainbow lines caused by realizing high-resolution projection of a picture of the non-native 4K projection device through 'jitter'.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. The above-described apparatus and method embodiments are merely illustrative.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A projection assembly, comprising:
a light source (14);
the first display panel (15) is arranged on one side of the light source (14) and used for converting light rays emitted by the light source (1) into two groups of polarized light in a preset polarization direction;
the second display panel (16) is arranged on one side, far away from the light source (14), of the first display panel (15) and is used for deflecting one of the two groups of polarized light emitted by the first display panel (15) so as to enable the polarization directions of the two groups of polarized light to be different;
and the birefringent crystal (3) is arranged on one side of the second display panel (16) far away from the light source (14) and is used for refracting the two groups of polarized light emitted by the second display panel (16) according to different refractive indexes.
2. The projection assembly of claim 1, further comprising:
the first lens (12) is arranged between the light emitting side of the light source (14) and the first display panel (15) and is used for modulating the light emitted by the light source (14) into approximately collimated light;
and the second lens (2) is arranged on the light emergent side of the birefringent crystal (3) and is used for converging the light rays emitted by the birefringent crystal (3).
3. The projection assembly of claim 2, further comprising:
and the projection lens (1) is used for projecting the emergent light of the second lens (2).
4. The projection assembly of claim 1, wherein the birefringent crystal (3) refracts the two sets of polarized light exiting the second display panel (16) according to different refractive indices, such that the projections of the two sets of polarized light are shifted on the normal plane of the light by no more than half the pixel width.
5. A projection unit according to claim 1, wherein the second display panel (16) is adapted to deflect 90 ° one of the two sets of polarized light exiting the first display panel (15).
6. The projection assembly according to claim 1, wherein the two groups of polarized lights emitted from the first display panel (15) display frames, and the display time difference between two adjacent frames of frames is a predetermined time, so that two adjacent frames of frames are alternately emitted into the second display panel (16).
7. The projection assembly according to claim 1, wherein the refresh rates of the first display panel (15) and the second display panel (16) are the same.
8. A projection assembly according to claim 1, wherein the second display panel (16) is a LCD display panel with polarizing effect.
9. A projection assembly according to claim 1, wherein the birefringent crystal (3) is at an angle to the normal plane of the exit light of the second display panel (16).
10. The projection assembly of claim 9, wherein the angle is in the range of 0 ° to 90 °.
11. The projection assembly according to claim 1, wherein the first display panel (15) and the second display panel (16) are spaced apart or integrated.
12. A projector comprising a projection assembly as claimed in any one of claims 1 to 8.
13. A display system, comprising:
the projection assembly of any one of claims 1 to 10 or the projector of claim 11;
and the projection curtain is used for projecting the emergent light of the birefringent crystal (3) to form a projection picture.
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| CN113721415A (en) * | 2021-08-30 | 2021-11-30 | 歌尔光学科技有限公司 | Projection light machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113721415A (en) * | 2021-08-30 | 2021-11-30 | 歌尔光学科技有限公司 | Projection light machine |
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