CN109358429B - Structure and method for realizing 2D/3D switchable - Google Patents
Structure and method for realizing 2D/3D switchable Download PDFInfo
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- CN109358429B CN109358429B CN201810654616.9A CN201810654616A CN109358429B CN 109358429 B CN109358429 B CN 109358429B CN 201810654616 A CN201810654616 A CN 201810654616A CN 109358429 B CN109358429 B CN 109358429B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
- G02B30/36—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers using refractive optical elements, e.g. prisms, in the optical path between the images and the observer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
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Abstract
The invention discloses a structure and a method for realizing 2D/3D switching, wherein the structure comprises a linearly polarized light module, a first prism layer and a second prism layer which are arranged in a stacked mode; the linearly polarized light module is used for switching between a first polarization mode through which the first polarized light can pass and a second polarization mode through which the second polarized light can pass; the polarization directions of the first polarized light and the second polarized light are different; the first prism layer comprises a first prism array and a first birefringent material, and the second prism layer comprises a second prism array and a second birefringent material; the structure as a whole is arranged to direct light of a first polarization in a first direction and light of a second polarization in a second direction when passing light of the first polarization, the first direction being different from the second direction.
Description
Technical Field
The invention relates to the field of 3D display, in particular to a structure and a method for realizing 2D/3D switchable through directional backlight.
Background
Solutions for enabling naked-eye 3D with a directional backlight structure are disclosed in the prior art. As shown in fig. 1, patent CN102067011B discloses a directional naked-eye 3D structure, which is implemented by separately controlling two side LED lamps (32, 34) in combination with a light steering structure: 34 after the light source is turned on, the light rays are deflected towards the direction of the eye 1a more after passing through the structure 40; 32 the light is deflected more towards the eye 1b after passing through the structure 40. Therefore, naked eye 3D is achieved by controlling the LED switches on the two sides through frequency.
However, the directional backlight has a difficulty in realization and a problem of mass productivity, and the light guide plate with light incident on both sides and one side has a problem of non-uniform picture due to difficulty in ensuring the uniformity of light sources on both sides. And this scheme cannot realize 2D/3D switchability.
US6069650 proposes a switchable scheme for achieving a lens effect by switching the liquid crystal state by an electric field, but this scheme results in a reduction in display quality due to insufficient liquid crystal switching.
Disclosure of Invention
The invention mainly aims to provide a structure and a method for realizing 2D/3D switchable, so as to solve the problems that the prior art is low in display quality and cannot perform 2D/3D switchable.
In order to achieve the above object, according to an aspect of the present invention, there is provided a 2D/3D switchable structure, sequentially including a first linearly polarized light module, a first prism layer, a second linearly polarized light module, and a second prism layer according to a direction in which light passes;
the first linear polarization light module is used for switching between a first polarization mode through which first polarized light can pass and a second polarization mode through which second polarized light can pass; the polarization directions of the first polarized light and the second polarized light are different;
the first prism layer comprises a first prism array and a first birefringent material, and the second prism layer comprises a second prism array and a second birefringent material;
the second linear polarization light module is used for switching between a first polarization mode through which the first polarized light can pass and a second polarization mode through which the second polarized light can pass;
when the first and second linear polarization modules are in the same polarization mode, the structure as a whole is arranged to direct the first polarized light in a first direction when the first polarized light passes through, and to direct the second polarized light in a second direction when the second polarized light passes through, the first direction being different from the second direction;
when the first linear polarization module and the second linear polarization module are in different polarization modes, the whole structure is set to keep the original propagation direction of the polarized light when the first polarized light or the second polarized light passes through.
Preferably, the first and second liquid crystal materials are,
the first prism layer is used for deflecting the first polarized light to a first direction and keeping the second polarized light in an incident direction;
the second prism layer is used for keeping the incident direction of the first polarized light and deflecting the second polarized light to a second direction.
Preferably, the first and second liquid crystal materials are,
the refractive index of the first prism array is equal to the refractive index of the first double-refractive-index material in the optical axis direction;
the refractive index of the second prism array is equal to the refractive index of the second double-refractive-index material in the optical axis direction;
the optical axis direction of the first birefringent material is different from the optical axis direction of the second birefringent material;
the polarization direction of the first polarized light is the optical axis direction of the second birefringent material, and the polarization direction of the second polarized light is the optical axis direction of the first birefringent material.
Preferably, the first and second liquid crystal materials are,
the first linear polarization module and the first linear polarization module are switched between a first polarization mode and a second polarization mode in a mechanical or electrical switching mode.
Preferably, the first and second liquid crystal materials are,
the first linear polarization light module comprises a polarizer and a first polarization rotation switch;
the polarizer is used for converting incident light into linearly polarized light, and the linearly polarized light comprises first polarized light or second polarized light;
the first polarization rotation switch is used for switching in a mode of keeping the incidence direction of the linearly polarized light and deflecting the direction of the linearly polarized light to the direction of the other polarized light;
the second linearly polarized light module includes a second polarization rotation switch for switching in a mode of maintaining an incident direction of the linearly polarized light and deflecting the direction of the linearly polarized light to a direction of another polarized light.
Preferably, the first prism array and the second prism array have the same refractive index.
Preferably, the first and second liquid crystal materials are,
the optical axis direction of the first birefringent material is along the arrangement direction of the first prism array;
the optical axis direction of the second birefringent material is along the prism extension direction in the second prism array.
Preferably, the first birefringent material is liquid crystal molecules cured on the first prism layer and/or the second birefringent material is liquid crystal molecules cured on the second prism layer.
In another aspect, the present invention further provides a method for implementing 2D/3D switchable, which is applied to the structure described above, and includes:
when performing 3D display:
alternating steps 1 and 2:
step 1: the first polarized light is obtained through the first linear polarized light module and enters the first prism layer, and the first polarized light enters the second prism layer through the second linear polarized light module;
step 2: the linearly polarized light module obtains second polarized light which is incident to the first prism layer and is incident to the second prism layer through the second linearly polarized light module;
when 2D display is carried out, the second polarized light obtained by the first linear polarized light module enters the first prism layer, and the second polarized light is converted into the first polarized light by the second linear polarized light module and enters the second prism layer.
Preferably, the first linear polarization module comprises a polarizer and a first polarization rotation switch;
the polarizer obtains linearly polarized light of the first polarized light or the second polarized light;
and the linearly polarized light keeps the incident direction or is deflected to the direction of the other polarized light by the first polarization rotating switch.
Has the advantages that:
according to the technical scheme, the two prism layers have the birefringence characteristic, the two linearly polarized light modules are switched between the first polarization mode capable of passing through the first polarized light and the second polarization mode capable of passing through the second polarized light, the two prism layers deflect or maintain different polarized light respectively, so that emergent light with different directions is obtained, naked eye 3D display is achieved, and 2D/3D switching is further achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a prior art naked eye 3D device structure diagram;
FIG. 2 is a diagram illustrating a first deflection state for implementing a 3D display according to the present invention;
FIG. 3 is a diagram illustrating a second orientation deflection state for implementing a 3D display according to the present invention;
FIG. 4 illustrates a state diagram for implementing a 2D display in accordance with the present invention;
FIG. 5 illustrates a first slot left eye view state;
fig. 6 shows a second slot right eye view state;
fig. 7 shows a 2D view state.
Wherein the figures include the following reference numerals:
a first prism array 11, a first birefringent material 12, a second birefringent material 13, a second prism array 14, a polarizer 15, a first deflection rotary switch 16, a second deflection rotary switch 17.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention aims to provide a structure for realizing 2D/3D switching, which sequentially comprises a first linear polarization light module, a first prism layer, a second linear polarization light module and a second prism layer according to the direction of light passing through;
the first linear polarization light module is used for switching between a first polarization mode through which first polarized light can pass and a second polarization mode through which second polarized light can pass; the polarization directions of the first polarized light and the second polarized light are different;
the first prism layer comprises a first prism array and a first birefringent material, and the second prism layer comprises a second prism array and a second birefringent material;
the second linear polarization light module is used for switching between a first polarization mode through which the first polarized light can pass and a second polarization mode through which the second polarized light can pass;
when the first and second linear polarization modules are in the same polarization mode, the structure as a whole is configured to direct the first polarized light to a first direction and the second polarized light to a second direction when the first polarized light passes through, the first direction being different from the second direction;
when the first linear polarization module and the second linear polarization module are in different polarization modes, the whole structure is set to keep the original propagation direction of the polarized light when the first polarized light or the second polarized light passes through.
The dual-prism-layer three-dimensional display device is provided with the dual prism layers, each prism layer has the birefringence characteristic, different prism layers deflect different polarized light, the first linear polarization module and the second linear polarization module are switched between the polarized light in two polarization directions, when the 3D display is realized, the first linear polarization module and the second linear polarization module are set to have the same mode, only the light in one polarization direction passes through the integral structure, and the light in the different polarization directions is deflected to different directions by setting the integral structure, so that the naked eye 3D is realized; when realizing 2D and showing, it is different to set up first and second linear polarization module mode for the polarized light through first prism layer and second prism layer is different, thereby all does not take place to deflect.
Specifically, the first prism layer is configured to deflect the first polarized light in a first direction and maintain the second polarized light in an incident direction, and the second prism layer is configured to maintain the first polarized light in the incident direction and deflect the second polarized light in a second direction.
In order to realize the above-mentioned deflection of polarized light, it is preferable in the present invention to set the refractive index of the first prism array equal to the refractive index of the first birefringent material in the optical axis direction; the refractive index of the second prism array is equal to the refractive index of the second double-refractive-index material in the optical axis direction; the optical axis direction of the first birefringent material is different from the optical axis direction of the second birefringent material, preferably in a perpendicular relationship, and specifically, the optical axis direction of the first birefringent material is along the arrangement direction of the first prism array; the optical axis direction of the second birefringent material is along the prism extension direction in the second prism array. The polarization direction of the first polarized light is the optical axis direction of the second birefringent material, and the polarization direction of the second polarized light is the optical axis direction of the first birefringent material.
In the invention, the first and second linear polarization modules can be switched between the first polarization mode and the second polarization mode in a mechanical or electrical switching mode. Specifically, the first linear polarization module comprises a polarizer and a polarization rotation switch; the polarizer is used for converting incident light into linearly polarized light, and the linearly polarized light comprises first polarized light or second polarized light; the first polarization rotation switch is used for maintaining the incidence direction of the linearly polarized light or deflecting the direction of the linearly polarized light to the direction of the other polarized light. The second linearly polarized light module includes a second polarization rotation switch for switching in a mode of maintaining an incident direction of the linearly polarized light and deflecting the direction of the linearly polarized light to a direction of another polarized light.
In the present invention, the refractive indexes of the first prism array and the second prism array may be the same or different, and the first birefringent material and the second birefringent material may be the same or different.
The first birefringent material may be liquid crystal molecules cured in the first prism layer and/or the second birefringent material may be liquid crystal molecules cured in the second prism layer.
Example one
The birefringent material is liquid crystal molecules, the liquid crystal molecules are cured in advance, the arrangement direction of the long axis direction of the molecules can be configured in advance, in the embodiment, the long axis direction of the cured liquid crystal molecules in the upper layer prism structure, namely the first birefringent material 12, is arranged along the arrangement direction of the prism array (arranged along the horizontal direction of the paper in the figure), and the long axis direction of the cured liquid crystal molecules in the lower layer prism structure, namely the second birefringent material 13, is arranged along the extending direction of the prism (arranged along the direction vertical to the paper in the figure).
Several working states of the embodiment of the invention for realizing naked-eye 3D are described in detail below.
The first working state: deflecting incident light with only lower prism structure assembly
As shown in fig. 2, the output light of the backlight unit is polarized linearly in the horizontal direction on the paper surface via the polarizer 15, and the first polarization rotation switch 16 is set so as not to rotate the polarization direction of the incident light in the first operation state, so that the polarization direction of the incident light upon incidence to the lower prism structure assembly is maintained in the horizontal direction on the paper surface.
At the second polarization rotating switch 17 of the two-layer prism structure assembly, which is in the OFF state, the polarization direction of the incident light is not rotated.
In the lower prism structure, i.e., the second prism layer, the refractive index of the second prism array 14 in the lower prism structure assembly is n2, which is isotropic, whereas in the present embodiment, n2 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules 13. When the incident light passes through the interface between the prism array 14 and the liquid crystal molecules 13, the polarization direction of the incident light is perpendicular to the long axis direction of the liquid crystal molecules 13 in the lower prism structure component, so the refractive index of the incident light in the liquid crystal molecules is no, and no < ne, so the incident light will be deflected in the lower prism structure component.
In the upper prism structure assembly, the refractive index of the first prism array 11 in the upper prism structure assembly is n1 which is isotropic, whereas in the present embodiment, n1 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules 12. When incident light passes through the interface between the prism array 11 and the liquid crystal molecules 12 of the layer, the polarization direction of the incident light is parallel to the long axis direction of the liquid crystal molecules in the upper prism structure assembly, so the refractive index of the incident light in the liquid crystal molecules is ne, and n1 is ne, so the incident light will be transmitted in the original direction in the upper prism structure assembly.
The second working state: deflecting incident light by only the upper prism structure assembly
As shown in fig. 3, the output light of the backlight unit is linearly polarized by the polarizer 15 with a polarization direction along the horizontal direction of the paper, and the polarization rotation switch 16 is set to rotate the polarization direction of the incident light by 90 degrees in the second operation state, so that the polarization direction of the incident light upon incidence to the lower prism structure assembly becomes the direction perpendicular to the paper.
In the lower prism structure assembly, the refractive index of the second prism array 14 in the lower prism structure assembly is n2 which is isotropic, whereas in the present embodiment, n2 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules 13. When the incident light passes through the interface between the prism array 14 and the liquid crystal molecules 13, the polarization direction of the incident light is parallel to the long axis direction of the liquid crystal molecules 13 in the lower prism structure component, so the refractive index of the incident light in the liquid crystal molecules 13 is ne, and n2 is ne, so the incident light is transmitted in the original direction protected in the lower prism structure component.
At the polarization rotating switch 17 of the two-layer prism structure assembly, which is in the OFF state, the polarization direction of the incident light is not rotated.
In the upper prism structure assembly, the refractive index of the first prism array 11 in the upper prism structure assembly is n1 which is isotropic, whereas in the present embodiment, n1 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules 12. When the incident light passes through the interface between the prism array 11 and the liquid crystal molecules 12, the polarization direction of the incident light is perpendicular to the long axis direction of the liquid crystal molecules 12 in the upper prism structure component, so the refractive index of the incident light in the liquid crystal molecules is no, and no < ne, so the incident light will be deflected in the upper prism structure component.
The following are the working states for realizing 2D display
The third working state: the two layers of prism structure components do not deflect the incident light
As shown in fig. 4, the output light of the backlight unit is linearly polarized by the polarizer 15 with a polarization direction along the horizontal direction of the paper, and the first polarization rotation switch 16 is set to rotate the polarization direction of the incident light by 90 degrees in the second operation state, so that the polarization direction of the incident light upon incidence to the lower prism structure assembly becomes the direction perpendicular to the paper.
In the lower prism structure assembly, the refractive index of the prism array in the lower prism structure assembly is n2 which is isotropic, whereas in the present embodiment n2 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules. When the incident light passes through the interface between the prism array and the liquid crystal molecules, the polarization direction of the incident light is parallel to the long axis direction of the liquid crystal molecules in the lower prism structure component, so the refractive index of the incident light in the liquid crystal molecules is ne, and n2 is ne, so the incident light is protected from being transmitted in the original direction in the lower prism structure component.
At the second polarization rotating switch 17 of the two-layer prism structure assembly, which is in this state, the switch is in the ON state, rotated by 90 degrees with respect to the polarization direction of the incident light. The polarization direction of the outgoing light is converted into the horizontal direction parallel to the paper surface.
In the upper prism structure assembly, the refractive index of the prism array in the upper prism structure assembly is n1 which is isotropic, whereas in the present embodiment, n1 is set to be the same as the refractive index ne corresponding to the long axis direction of the liquid crystal molecules. When incident light passes through the interface between the prism array and the liquid crystal molecules of the layer, the polarization direction of the incident light is parallel to the long axis direction of the liquid crystal molecules in the upper prism structure component, so the refractive index of the incident light in the liquid crystal molecules is ne, and n1 is ne, so the incident light will be transmitted in the original direction in the upper prism structure component.
Second embodiment 2D/3D display device implemented by using the structure of the first embodiment
Applying the structure of the above-described embodiment to the field of 3D display, a display panel, such as an LCD, may be disposed on the light emitting side of the entire structure. The structure can provide integrally-oriented backlight for the LCD, thereby realizing 2D/3D display.
The left eye view and the right eye view can be displayed in a time-sharing manner by controlling the first state and the second state to be switched, as shown in fig. 5 to 6, so that the purpose of directional backlight type 3D display is achieved.
A 2D display may be achieved by controlling the second polarization rotating switch such that the structure is in the third state.
Third embodiment a method for implementing 2D/3D using the structure of the first embodiment
The method comprises the following steps:
when performing 3D display:
alternating steps 1 and 2:
step 1: the first polarized light is obtained through the first linear polarized light module and enters the first prism layer, and the first polarized light enters the second prism layer through the second linear polarized light module;
step 2: the linearly polarized light module obtains second polarized light which is incident to the first prism layer and is incident to the second prism layer through the second linearly polarized light module;
when 2D display is carried out, the second polarized light obtained by the first linear polarized light module enters the first prism layer, and the second polarized light is converted into the first polarized light by the second linear polarized light module and enters the second prism layer.
Specifically, the first linear polarization module comprises a polarizer and a first polarization rotation switch; the polarizer obtains linearly polarized light of the first polarized light or the second polarized light; and the linearly polarized light keeps the incident direction or is deflected to the direction of the other polarized light by the polarization rotation switch.
In the preferred embodiment of the invention, the arrangement directions of the two layers of prism arrays are the same, and the extending directions of the prisms are also the same.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A structure for realizing 2D/3D switching is characterized by sequentially comprising a first linear polarization light module, a first prism layer, a second linear polarization light module and a second prism layer according to the direction of light passing through; the first linear polarization light module is used for switching between a first polarization mode through which first polarized light can pass and a second polarization mode through which second polarized light can pass; the polarization directions of the first polarized light and the second polarized light are different; the first prism layer comprises a first prism array and a first birefringent material, and the second prism layer comprises a second prism array and a second birefringent material; the second linear polarization light module is used for switching between a first polarization mode through which the first polarized light can pass and a second polarization mode through which the second polarized light can pass; when the first and second linearly polarized light modules are in the same polarization mode, the structure as a whole is arranged to direct the first polarized light in a first direction when passing the first polarized light and to direct the second polarized light in a second direction when passing the second polarized light, the first direction being different from the second direction; when the first linear polarization light module and the second linear polarization light module are in different polarization modes, the whole structure is set to keep the original propagation direction of the polarized light when the first polarized light or the second polarized light passes through.
2. The structure for realizing 2D/3D switching according to claim 1, wherein the first prism layer is configured to deflect the first polarized light to a first direction and maintain an incident direction of the second polarized light; the second prism layer is used for keeping the incident direction of the first polarized light and deflecting the second polarized light to a second direction.
3. The structure for realizing 2D/3D switching according to claim 1, wherein the refractive index of the first prism array is equal to the refractive index of the first birefringent material in the optical axis direction; the refractive index of the second prism array is equal to the refractive index of the second double-refractive-index material in the optical axis direction; the optical axis direction of the first birefringent material is different from the optical axis direction of the second birefringent material; the polarization direction of the first polarized light is the optical axis direction of the second birefringent material, and the polarization direction of the second polarized light is the optical axis direction of the first birefringent material.
4. The structure for realizing 2D/3D switching according to claim 1, wherein the first linearly polarized light module and the second linearly polarized light module are switched between the first polarization mode and the second polarization mode by mechanical or electrical switching.
5. The structure for realizing 2D/3D switching according to claim 1, wherein said first linearly polarized light module comprises a polarizer and a first polarization rotation switch; the polarizer is used for converting incident light into linearly polarized light, and the linearly polarized light comprises first polarized light or second polarized light; the first polarization rotation switch is used for switching in a mode of keeping the incidence direction of the linearly polarized light and deflecting the direction of the linearly polarized light to the direction of the other polarized light; the second linearly polarized light module includes a second polarization rotation switch for switching in a mode of maintaining an incident direction of the linearly polarized light and deflecting the direction of the linearly polarized light to a direction of another polarized light.
6. The structure for realizing 2D/3D switching according to claim 1, wherein the refractive index of the first prism array is the same as that of the second prism array.
7. The structure for realizing 2D/3D switching according to claim 3, wherein the optical axis direction of the first birefringent material is along the arrangement direction of the first prism array; the optical axis direction of the second birefringent material is along the prism extension direction in the second prism array.
8. The structure for realizing 2D/3D switching according to claim 1, wherein the first birefringent material is liquid crystal molecules cured on the first prism layer and/or the second birefringent material is liquid crystal molecules cured on the second prism layer.
9. A method for implementing 2D/3D handover, applied to the structure for implementing 2D/3D handover according to any one of claims 1-8, the method comprising: when performing 3D display: alternating steps 1 and 2: step 1: the first polarized light is obtained through the first linear polarized light module and enters the first prism layer, and the first polarized light enters the second prism layer through the second linear polarized light module; step 2: the second polarized light obtained by the first linear polarized light module enters the first prism layer, and enters the second prism layer through the second linear polarized light module; when 2D display is carried out, the second polarized light obtained by the first linear polarized light module enters the first prism layer, and the second polarized light is converted into the first polarized light by the second linear polarized light module and enters the second prism layer.
10. The method of implementing 2D/3D switching according to claim 9, wherein the first linearly polarized light module comprises a polarizer and a first polarization rotating switch; the polarizer obtains linearly polarized light of the first polarized light or the second polarized light; and the linearly polarized light keeps the incident direction or is deflected to the direction of the other polarized light by the first polarization rotating switch.
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