CN112748634A - High light efficiency does not have colored ribbon device of polarizing - Google Patents

Abstract

The invention discloses a high-light-efficiency non-colored-band polarizing device, which is used for performing three-dimensional projection on an incident playing picture light beam and comprises a prism structure main body, wherein the prism structure main body comprises a first light splitting film layer, a second light splitting film layer and an incident window, the first light splitting film layer and the second light splitting film layer are used for decomposing the incident playing picture light beam into a first polarization state and a second polarization state, the incident window is used for receiving the incident playing picture light beam, the first light splitting film layer and the second light splitting film layer are connected in the prism structure main body, the first light splitting film layer comprises a first light incident part and a second light incident part, the second light splitting film layer comprises a third light incident part and a fourth light incident part, and the incident window is formed by the second light incident. By implementing the invention, the problem that the light path structure in the prior art cannot effectively focus a nearer projection screen is solved, and the problem of a color ribbon appearing in the middle of the projection screen in the prior art is avoided.

Description

High light efficiency does not have colored ribbon device of polarizing

Technical Field

The invention relates to the technical field of stereoscopic projection, in particular to a high-light-efficiency non-colored-tape polarizing device which is low in cost and can be focused in a close range.

Background

Light emitted by a light source of an existing projector is natural light, polarization is not displayed, and stereoscopic display needs to be realized by polarizing the light into linearly polarized light, modulating the linearly polarized light by using a Liquid Crystal Variable Retarder (LCVR), and enabling left and right eye images to enter left and right eyes in a time-sharing manner so as to achieve the effect of stereoscopic display. Because the traditional method for generating light in a linear polarization state is to add a dichroic polarizer directly in front of a projection objective, the dichroic polarizer can absorb electric vector light parallel to an absorption axis, namely more than 55% of light energy is absorbed by the polarizer, and the display brightness of the screen is greatly reduced.

More than 55% of the emitted light energy can be continuously absorbed by the polaroid, which can cause the temperature of the polaroid to rise, and the performances such as the polarization degree of the polaroid can be reduced, even the polaroid can be damaged. In addition, the polarizer is attached to the surface of the liquid crystal variable phase retarder, which causes liquid crystal molecules in the liquid crystal cell to absorb most of the heat, and the liquid crystal molecules are very temperature sensitive substances, which affects the birefringence coefficient thereof, causes the optical path difference of the polarized o and e lights to change or even fail, and further affects the three-dimensional picture effect of the screen display.

Compared with the polarization beam splitter in the prior art, the polarization beam splitter has the advantages that the transmission light beam and the reflection light beam can have the same polarization state after leaving the polarization beam splitter, and the transmittance and the reflectivity in a visible wave band are far higher than those of the common polarization beam splitter.

The existing polarization light splitting structure comprises 1 obtuse-angle triangular prism with an obtuse angle of 156 +/-2 degrees, 1 isosceles right-angle prism, 2 identical acute-angle triangular prisms, an upper reflector and a lower reflector, and the lens assembly consisting of a half-concave lens 31 and a convex lens 32 is adopted in the lens structure.

However, the whole volume of the light splitting structure is too large, so that the production and installation cost is too high, the small throw ratio plate price is too high, the volume is too large, the practical value is low, the deflection angle is too large when a film layer is irradiated, the light splitting efficiency is reduced, and the lighting effect is influenced.

Disclosure of Invention

The focusing lens group is adjusted according to the actual screen distance, and focusing is difficult to complete for a particularly close projection screen.

To the above-mentioned problem, provide a high light efficiency does not have colored ribbon polarization device, through setting up two beam splitting retes, be respectively with the light of incident broadcast picture light beam decomposition into the light of first polarization state and the light of second polarization state, and it is respectively right the light of first polarization state, the light of second polarization state reflect, because two light path optical distances are close to equal and simply adjustable, solved the problem that light path structure can't effectively focus to nearer projection screen among the prior art, the light of polarization state is divided into two parts that the optical path difference is close, and can reach the regulation coincidence purpose through simple adjustment speculum interval, can adapt the arbitrary distance that the projecting apparatus supported, including the utmost point closely. Meanwhile, the light bodies in different polarization states are separated, and the process of separating in advance from the space is avoided, so that the problem of a color ribbon appearing in the middle of a projection screen in the prior art is solved.

A high light efficiency color-ribbon-free polarizing device for projecting incident playing picture beams stereoscopically, comprising:

a linear polarizer;

a polarization modulator;

a prismatic structural body;

the prism structure body comprises a first light splitting film layer and a second light splitting film layer which are used for splitting the incident playing picture light beam into a first polarization state and a second polarization state, and an incident window used for receiving the incident playing picture light beam, the first light splitting film layer and the second light splitting film layer are vertically connected in the structure body, the first light splitting film layer comprises a first light incident portion and a second light splitting portion, and the second light splitting film layer comprises a third light splitting portion and a fourth light splitting portion.

In a first possible implementation manner, the first light splitting film layer and the second light splitting film layer are rectangular and are connected at a diagonal line.

In a second possible embodiment in combination with the first possible embodiment of the present invention, the first dichroic portion and the third dichroic portion are provided inside the prism structure body, the second dichroic portion and the fourth dichroic portion extend outward from the first dichroic portion and the third dichroic portion, respectively, and the entrance window is formed by surrounding the second dichroic portion and the fourth dichroic portion.

In combination with the first possible embodiment and the third possible embodiment of the present invention, the prism structure body is a high refractive index glass prism, and the first light splitting film layer and the second light splitting film layer are formed inside the prism structure body.

With reference to the first possible implementation manner and the fourth possible implementation manner of the present invention, the first light splitting film layer and the second light splitting film layer are light splitting planes, and an air interlayer is disposed in front of and/or behind the light splitting planes.

In a fifth possible embodiment in combination with the first possible embodiment of the present invention, the first light splitting film layer has a rectangular structure with a diagonal of a rectangle on a side surface of the prism structure body as a wide side, the second light splitting film layer has a rectangular structure with a diagonal of a rectangle on a bottom surface of the prism structure body as a long side, and the first light splitting film layer and the second light splitting film layer are joined at the diagonal.

In a sixth possible implementation manner of the high luminous efficiency color ribbon-free polarizing device according to the invention, the second light splitting part and the fourth light splitting part are configured to split the incident playing image light beam into a first polarization state and a second polarization state and reflect the light in the first polarization state to obtain a first reflected light, and the first light splitting part and the third light splitting part are configured to reflect the light in the second polarization state to obtain a second reflected light.

In a seventh possible implementation manner, in combination with the high light efficiency color ribbon-free polarizing device of the present invention, the polarizing device further includes a first reflecting portion for reflecting the light of the first polarization state to a linear polarizer, and a second reflecting portion for reflecting the light of the second polarization state to the linear polarizer.

In an eighth possible implementation manner, in combination with the high light efficiency color ribbon-free polarizing device of the present invention, the first reflecting portion is disposed on the left side and/or the right side of the polarizing device, and the second reflecting portion is disposed on the upper side and/or the lower side of the polarizing device.

In a ninth possible implementation manner, the prism structure body further includes a shielding screen for filtering transmitted stray light.

The high-light-efficiency color-band-free polarizing device provided by the invention is implemented by arranging two light splitting film layers, respectively splitting an incident playing picture light beam into a first polarization state light and a second polarization state light, and respectively reflecting the first polarization state light and the second polarization state light, so that the problem that the light path structure in the prior art cannot effectively focus a nearer projection screen is solved, the polarization state light is split into two parts with similar optical path difference, the purpose of tuning and overlapping can be achieved by simply adjusting the distance between the reflectors, and the device can be adapted to any distance supported by a projector, including a very short distance. Meanwhile, the problem of a color ribbon appearing in the middle of a projection screen in the prior art is solved by integrally decomposing and reflecting incident light twice.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic front view of a prism structure in a high light efficiency non-color-band polarizer according to the present invention;

FIG. 2 is a schematic top view of a prism structure in a high light efficiency non-color stripe polarizing device according to the present invention;

FIG. 3 is a side view of a prism structure body in a high light efficiency ribbon-less polarizer of the present invention;

FIG. 4 is a schematic perspective view of a prism structure body of a high light efficiency color band-free polarizer of the present invention, shown as ray 1;

FIG. 5 is a schematic perspective view of a main body of a prism structure in the high-luminance non-color-band polarizer of the present invention, shown as ray 2;

FIG. 6 is a perspective view of a high light efficiency ribbon-less polarizer of the present invention;

FIG. 7 is a schematic top view of a high light efficiency ribbon-less polarizer of the present invention;

the part names indicated by the numbers in the drawings are as follows: 100-polarizing device, 101-prism structure body, 110-incidence window, 120-first light splitting film layer, 121-second light splitting part, 122-first light splitting part, 130-second light splitting film layer, 131-fourth light splitting part, 132-third light splitting part, 200-first reflection part, 300-second reflection part, 400-linear polarizer, 410-first linear polarizer, 420-second linear polarizer, 500-polarization modulator, 510-first polarization modulator, 520-second polarization modulator.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The whole volume of current beam split structure is too big, leads to the production installation cost too high, makes its little throw than the version price too high volume too big, and current three optical path structures have the colored ribbon to appear in the middle of the screen simultaneously, and the lens group needs adjust according to actual screen distance, to the projection screen that is very close, is difficult to accomplish focusing.

In view of the above problems, a high light efficiency color band-free polarizer 100 is proposed, as shown in fig. 1-3, fig. 1 is a schematic front view of a prism structure body 101 in the high light efficiency color band-free polarizer 100 of the present invention, fig. 2 is a schematic top view of the prism structure body 101 in the high light efficiency color band-free polarizer 100 of the present invention, and fig. 3 is a schematic side view of the prism structure body 101 in the high light efficiency color band-free polarizer 100 of the present invention.

A high light efficiency color ribbon-free polarizing device 100, as shown in FIG. 4, FIG. 4 is a schematic view of a three-dimensional light 1 of a prism structure body 101 in the high light efficiency color ribbon-free polarizing device 100 of the present invention, for performing three-dimensional projection on an incident playing image light beam, which includes the prism structure body 101, the prism structure body 101 includes a first light splitting film layer 120 for splitting the incident playing image light beam into a first polarization state and a second polarization state, a second light splitting film layer 130 and an incident window 110 for receiving the incident playing image light beam, the first light splitting film layer 120 and the second light splitting film layer 130 are vertically connected inside the prism structure body 101, the first light splitting film layer 120 includes a first light splitting part 122 and a second light splitting part 121, and the second light splitting film layer 130 includes a third light splitting part 132 and a fourth light splitting part 131.

The first dichroic portion 122 and the third dichroic portion 132 are disposed inside the prism structure body 101, the second dichroic portion 121 and the fourth dichroic portion 131 respectively extend from the first dichroic portion 122 and the third dichroic portion 132 to the outside, and the incident window is enclosed by the second dichroic portion 121 and the fourth dichroic portion 131. The incident window 110 is formed by enclosing the second dichroic portion 121 and the fourth dichroic portion 131.

The prism structure body 101 is a high refractive index glass prism, and the first dichroic film layer 120 and the second dichroic film layer 130 are molded inside the prism structure body 101.

The first light splitting film layer 120 and the second light splitting film layer 130 are light splitting planes, and an air interlayer is arranged in front of and/or behind the light splitting planes.

The first light splitting film layer and the second light splitting film layer can be wrapped by glass or other optical materials before and after the two light splitting surfaces, and can also be partially replaced by air, and the modifications are within the protection scope of the application.

Through setting up two beam splitting retes, the light that will incide the broadcast picture light beam and decompose into the light of first polarization state and second polarization state respectively, and the light to first polarization state, the light of second polarization state reflects respectively, the light of polarization state is divided into two parts that the optical path difference is close, and can reach the accent through simple adjustment speculum interval and coincide the purpose, the problem of the unable effective focusing of light path structure to nearer projection screen among the prior art has been solved, arbitrary distance that can the adaptation projecting apparatus support, including the utmost point closely.

In some embodiments, the second light splitting part 121 and/or the fourth light splitting part 131 is configured to split the incident broadcast image light beam into light of a first polarization state and light of a second polarization state, and the first light splitting part 122 and/or the third light splitting part 132 is configured to reflect the light of the second polarization state.

As shown in fig. 5 and fig. 5 are schematic diagrams of a perspective view light 2 of the prism structure body 101 in the high light efficiency non-colored ribbon polarizing device 100 of the present invention, where the second light splitting part 121 and the fourth light splitting part 131 may have light splitting and reflecting functions at the same time, or may be used for light splitting and reflecting separately, and the first light splitting part 122 and the third light splitting part 132 may be used for reflecting light in the second polarization state at the same time, or may be used for reflecting separately, and both belong to the protection scope of the present application. In a preferred embodiment of the present application, the second dichroic portion 121 and the fourth dichroic portion 131 may each split and reflect an incident light beam, and the first dichroic portion 122 and the third dichroic portion 132 may each reflect light in the second polarization state.

First beam splitting membrane layer 120 and second beam splitting membrane layer 130 hand-over, first beam splitting membrane layer 120 and second beam splitting membrane layer 130 are the beam splitting plane, and the selfing junction divides into inside and outside two parts with two beam splitting planes, and the part of outside is used for decomposing the light that the incident broadcast picture light beam is the light of first polarization state and second polarization state to the light of the first polarization state that will decompose reflects. The inner portion is for reflecting light of the second polarization state. Through the above decomposition and the reflection of the light in the first polarization state and the light in the second polarization state respectively, the problem of the color band appearing in the middle of the projection screen in the prior art is avoided.

In some embodiments, the prismatic structured body 101 may be designed to resemble a rectangular parallelepiped, lacking a beveled corner, with the entire bottom, side, and front portions being rectangular. The first dichroic film layer 120 and the second dichroic film layer 130 are rectangular dichroic planes, and the middle portions of the dichroic planes of the first dichroic film layer 120 and the second dichroic film layer 130 are connected.

In some embodiments, the first dichroic film layer 120 has a rectangular structure with a diagonal of a rectangle on the side of the prism structure body 101 as a wide side, the second dichroic film layer 130 has a rectangular structure with a diagonal of a rectangle on the bottom of the prism structure body 101 as a long side, and the first dichroic film layer 120 and the second dichroic film layer 130 meet each other at the diagonal. The intersection line of the first light splitting film layer 120 and the second light splitting film layer 130 is a diagonal line, the plane of the first light splitting film layer 120 is a long inclined plane inclined to the left and right of the prism structure body 101, and the plane of the second light splitting film layer 130 is a short inclined plane inclined to the top and bottom of the prism structure body 101.

As shown in fig. 6 and fig. 6, which is a perspective view of the high light efficiency achromatic color ribbon polarizer 100 according to the present invention, the second light splitting part 121 and the fourth light splitting part 131 are used for splitting the incident broadcast image light beam into the first polarization state and the second polarization state and reflecting the light in the first polarization state to obtain a first reflected light, and the first light splitting part 122 and the third light splitting part 132 are used for reflecting the light in the second polarization state to obtain a second reflected light.

After the light at the upper left portion of the incident window 110 passes through the spectroscopic surface of the second dichroic portion 121, as shown in the figure, most of the resolved light in the first polarization state is reflected to the right to exit the spectroscopic structure as the first reflected light. The light of the second polarization state continues to the splitting surface of the third light splitting part 132, which is equivalent to the light of the first polarization state for the surface, and is reflected to the upper side out of the light splitting structure.

After the light in the lower right portion of the incident window 110 passes through the light splitting surface of the fourth light splitting part 131, as shown in the figure, most of the split light in the first polarization state is reflected to the right to exit the light splitting structure as the first reflected light. The light of the second polarization state continues to the spectroscopic surface of the fourth light-splitting part 131, which corresponds to the light of the first polarization state, and is reflected to the upper side to exit the spectroscopic structure.

Further, the polarization device 100 further includes a first reflection part 200 for reflecting the light with the first polarization state to the polarization modulator and a second reflection part 300 for reflecting the light with the second polarization state to the polarization modulator. The first reflection part 200 is disposed at the left and/or right side of the polarizing device 100, and the second reflection part 300 is disposed at the upper and/or lower side of the polarizing device 100.

Referring to fig. 7, fig. 7 is a schematic top view of the polarization device 100 without color ribbon with high light efficiency, the polarization device 100 further includes a linear polarizer 400, the linear polarizer 400 includes a first linear polarizer 410 and a second linear polarizer 420, and the first linear polarizer 410 and the second linear polarizer 420 are respectively disposed corresponding to the emergent light paths of the first reflective portion 200 and the second reflective portion 300. The polarization device 100 further includes a polarization modulator 500, which includes a first polarization modulator 510 and a second polarization modulator 520, wherein the first polarization modulator 510 and the second polarization modulator 520 are respectively disposed corresponding to the first linear polarizer 410, the second linear polarizer 420 and the third linear polarizer. The light reflected by the first and second reflection parts 200 and 300 passes through the linear polarizer and the polarization modulator and is projected onto a screen.

The high-light-efficiency color-ribbon-free polarizing device 100 provided by the invention is implemented by arranging the two light splitting film layers, respectively splitting the incident playing picture light beam into the light in the first polarization state and the light in the second polarization state, respectively reflecting the light in the first polarization state and the light in the second polarization state, dividing the light in the polarization state into two parts with similar optical path difference, and achieving the purpose of adjusting and superposing by simply adjusting the distance between the reflectors, so that the problem that the light path structure in the prior art cannot effectively focus a relatively close projection screen is solved, and the device can be adapted to any distance supported by a projector, including a very short distance. Meanwhile, through the decomposition and the twice reflection, the problem of a color ribbon appearing in the middle of the projection screen in the prior art is solved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A high light efficiency non-color ribbon polarizing device for projecting incident playing picture beams stereoscopically, comprising:

a linear polarizer;

a polarization modulator;

a prismatic structural body;

the prism structure body comprises a first light splitting film layer and a second light splitting film layer which are used for splitting the incident playing picture light beam into a first polarization state and a second polarization state, and an incident window used for receiving the incident playing picture light beam, the first light splitting film layer and the second light splitting film layer are vertically connected in the prism structure body, the first light splitting film layer comprises a first light incident part and a second light splitting part, and the second light splitting film layer comprises a third light splitting part and a fourth light splitting part.

2. The high light efficiency color-ribbon-free polarizer of claim 1 wherein the first and second light splitting film layers are rectangular and meet at a diagonal.

3. The high luminous efficiency non-colored ribbon polarizing device according to claim 2, wherein the first dichroic portion and the third dichroic portion are disposed inside the prism structure body, the second dichroic portion and the fourth dichroic portion extend from the first dichroic portion and the third dichroic portion to the outside, respectively, and the incident window is enclosed by the second dichroic portion and the fourth dichroic portion.

4. The high light efficiency, colorband-free polarizing device of claim 2 wherein said prismatic structure body is a high index glass prism and said first and second dichroic film layers are molded inside said prismatic structure body.

5. The high light efficiency color-ribbon-free polarizing device according to claim 2, wherein the first light splitting film layer and the second light splitting film layer are light splitting planes, and an air interlayer is disposed in front of and/or behind the light splitting planes.

6. The high light efficiency color-ribbon-free polarizing device according to claim 2, wherein the first light splitting film layer is a rectangular structure with a rectangular diagonal of the side surface of the prism structure body as a wide side, the second light splitting film layer is a rectangular structure with a rectangular diagonal of the bottom surface of the prism structure body as a long side, and the first light splitting film layer and the second light splitting film layer meet at the diagonal.

7. The high luminous efficiency color-ribbon-free polarizer according to claim 1, wherein the second and fourth light splitting parts are configured to split the incident broadcast image light beam into a first polarization state and a second polarization state and reflect the light in the first polarization state to obtain a first reflected light, and the first and third light splitting parts are configured to reflect the light in the second polarization state to obtain a second reflected light.

8. The high light efficiency color-ribbon-free polarizing device of claim 1, further comprising a first reflecting portion for reflecting the light of the first polarization state to a linear polarizer and a second reflecting portion for reflecting the light of the second polarization state to a linear polarizer.

9. The high light efficiency ribbon-free polarizing device according to claim 8, wherein the first reflecting portion is disposed at a left side and/or a right side of the polarizing device, and the second reflecting portion is disposed at an upper side and/or a lower side of the polarizing device.

10. The high luminous efficacy ribbon-free polarizer device of any of claims 1-9, wherein the prismatic structured body further comprises a blocking screen for filtering transmitted stray light.

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