CN110989258B - Spatial light modulator and holographic 3D display device - Google Patents
Spatial light modulator and holographic 3D display device Download PDFInfo
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
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Abstract
The invention discloses a spatial light modulator and holographic 3D display equipment, wherein the spatial light modulator is characterized in that the transmittance of a first sub-pixel group to green light is not more than 2% by setting different color film structures of the first sub-pixel group, a second sub-pixel group and a third sub-pixel group, so that the transmittance of blue sub-pixels in the first sub-pixel group to green light in a green backlight time sequence can be greatly reduced, and the problem of crosstalk of backlight of different colors is avoided. Because the color film structures of the second sub-pixel group and the third sub-pixel group are different from the color film structure of the first sub-pixel, the transmittance of the second sub-pixel group and the third sub-pixel group to the corresponding backlight can be improved, and the display brightness is improved. The holographic 3D display equipment is provided with the spatial light modulator, so that the problem of crosstalk of backlight of different colors can be avoided, and the display brightness is improved.
Description
Technical Field
The invention relates to the technical field of 3D display, in particular to a spatial light modulator and holographic 3D display equipment.
Background
With the continuous development of science and technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present.
In order to meet the use requirements of people for stereoscopic display of display devices, 3D holographic display becomes a major development direction in the display field at present. The 3D holographic display device needs to perform phase and amplitude modulation on coherent light by a Spatial Light Modulator (SLM) in order to realize 3D holographic display.
The spatial light modulator includes two liquid crystal panels disposed opposite to each other for phase modulation and amplitude modulation, respectively. In the existing spatial light modulator, crosstalk of light rays with different colors exists in pixel emergent light rays, and the image display quality is influenced.
Disclosure of Invention
In view of this, the present invention provides a spatial light modulator and a holographic 3D display device, and the schemes are as follows:
the technical scheme of the invention provides a spatial light modulator, wherein sub-pixels of two liquid crystal panels are arranged oppositely one by one, sub-pixels with the same color in different liquid crystal panels are arranged oppositely, a first sub-pixel group is provided with two opposite first sub-pixels, a second sub-pixel group is provided with two opposite second sub-pixels, a third sub-pixel group is provided with two opposite third sub-pixels, the first sub-pixel is a blue sub-pixel, the second sub-pixel is one of a red sub-pixel and a green sub-pixel, and the third sub-pixel is the other of the red sub-pixel and the green sub-pixel.
In the spatial light modulator, the transmittance of the first sub-pixel group to green light can be enabled to be not more than 2% by setting different color film structures of the first sub-pixel group, the second sub-pixel group and the third sub-pixel group, so that the transmittance of blue sub-pixels in the first sub-pixel group to green light in a green backlight time sequence can be greatly reduced, and the problem of crosstalk of backlight of different colors is avoided. And because the color film structures of the second sub-pixel group and the third sub-pixel group are different from the color film structure of the first sub-pixel, the transmittance of the corresponding backlight of the second sub-pixel group and the third sub-pixel group can be improved, and the display brightness is improved.
The technical scheme of the invention also provides holographic 3D display equipment, and the holographic 3D display equipment comprises light source equipment, a beam expanding and collimating component, a spatial light modulator, a field lens and a liquid crystal grating which are sequentially arranged. By adopting the spatial light modulator, the holographic 3D display equipment can ensure that the transmittance of two opposite blue sub-pixels in the spatial light modulator to green light does not exceed 2%, avoid the crosstalk problem of backlight of different colors, and simultaneously improve the transmittance of opposite green sub-pixels in the spatial light modulator to green light and the transmittance of opposite red sub-pixels in the spatial light modulator to red light.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a holographic 3D display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a spatial light modulator according to an embodiment of the present invention;
fig. 3 is a spectrum diagram of a monochromatic color film according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a spatial light modulator according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a first blue color resistance structure according to an embodiment of the present invention;
FIG. 6 is a diagram of a second blue color resistance structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another spatial light modulator according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of another second blue color resistance structure according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a red color resistance structure according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a green color resistance structure according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a spatial light modulator according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a spatial light modulator according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a spatial light modulator according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another spatial light modulator according to an embodiment of the present invention.
Detailed Description
In the following, embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The conventional three-dimensional 3D display principle is to compress 3D depth, different images of left and right eyes achieve the effect of observing 3D display by human eyes, and actually, the images are still displayed as two-dimensional images. And the holographic 3D display principle is stereoscopic display in space, and an observer can focus an object at any depth independently. The holographic 3D display may be implemented based on the device shown in fig. 1.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a holographic 3D display device according to an embodiment of the present invention, including: a backlight 11, a Spatial Light Modulator (SLM)12, a field lens 13, and a liquid crystal grating 14. The backlight 11 includes a light source device 111 and a beam expanding and collimating assembly 112 for emitting coherent red, green and blue backlights in time sequence. The spatial light modulator 12 includes a first liquid crystal panel 121 for performing phase modulation and a second liquid crystal panel 122 for performing amplitude modulation.
In the holographic 3D display device, to implement color holographic display, coherent backlight emitting in a time sequence of red, green, and blue is generally used, and the pixel units in the two liquid crystal panels of the spatial light modulator 12 are matched to implement hologram display of each color. In order to prevent crosstalk problem of wrong picture due to red backlight transmitting blue sub-pixel and/or green sub-pixel light simultaneously when red picture display is performed by red sub-pixel, for example, when red backlight is lighted, each color resistance structure is required to have sufficiently low transmittance for the rest two colors of backlight.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a spatial light modulator according to an embodiment of the present invention, in the spatial light modulator 12, a first liquid crystal panel 121 and a second liquid crystal panel 122 are relatively attached and fixed, in the first liquid crystal panel 121, a red sub-pixel, a green sub-pixel, and a blue sub-pixel are respectively and correspondingly provided with a red color resistance structure r, a green color resistance structure g, and a blue color resistance structure b, in the second liquid crystal panel 122, the red sub-pixel, the green sub-pixel, and the blue sub-pixel are respectively and correspondingly provided with a red color resistance structure r, a green color resistance structure g, and a blue color resistance structure b, so as to solve a crosstalk problem of different color backlights. In a liquid crystal panel, a common color resist structure is formed by adding a corresponding coloring material to a transparent substrate to allow light of a corresponding color to pass through and filter light of other colors.
Although the spatial light modulator with the structure shown in fig. 2 can better avoid the crosstalk problem of backlights with different colors, the transmittance of the backlight with the same color is also reduced by the scheme that the color resistance structures are respectively arranged on the upper and lower same sub-pixels in the spatial light modulator, which results in reduction of display brightness.
The inventor researches and discovers that the monochromatic spectrums of color films with different colors are shown in the following figure 3, the structure of the color film in the spatial light modulator can be improved based on the transmittance rule of the spectrogram discovered by the inventor, the backlight transmittance can be improved and the display brightness can be improved while the aim of avoiding the backlight crosstalk of different colors is fulfilled.
Referring to fig. 3, fig. 3 is a spectrum diagram of a monochromatic color film according to an embodiment of the present invention, in fig. 3, the horizontal axis represents wavelength in nm, the vertical axis represents transmittance, BT represents a blue transmittance curve, GT represents a green transmittance curve, RT represents a red transmittance curve, a dotted line a represents a blue backlight lighting timing, a dotted line B represents a green backlight lighting timing, and a dotted line C represents a red backlight lighting timing.
At the position indicated by the broken line a, the blue light transmittance is high and 75% or more, and the red and green light transmittances are low and 2% or less, respectively, in the blue backlight lighting timing. At the position indicated by the dotted line C, the red light transmittance is high and is 95% or more, and the blue light transmittance and the green light transmittance are low and are 2% or less in the red backlight lighting timing sequence. At the position indicated by the broken line B, the green backlight transmits the blue color film with a transmittance of 14% or more although the green light transmittance is high at 85% or more and the red light transmittance is low at 2% or less in the green backlight lighting timing.
As can be seen from fig. 3, in the spatial light modulator, the main reason for the crosstalk existing in the backlights with different colors is that the blue color film structure has a high transmittance for green light, and does not satisfy the display standard with a transmittance less than 2%.
Based on the above analysis description, an embodiment of the present invention provides a spatial light modulator, which has a first sub-pixel group, a second sub-pixel group and a third sub-pixel group, wherein two first sub-pixels opposite to each other in the first sub-pixel group are blue sub-pixels, two second sub-pixels opposite to each other in the second sub-pixel group are one of red sub-pixels and green sub-pixels, and two third sub-pixels opposite to each other in the third sub-pixel group are the other of red sub-pixels and green sub-pixels. The color film structures of the first sub-pixel group and the second sub-pixel group are different, and the color film structures of the first sub-pixel group and the third sub-pixel group are different, so that the transmittance of the first sub-pixel group to green light is not more than 2%, the transmittance of two blue sub-pixels in the first sub-pixel group to green light in a green backlight time sequence can be greatly reduced, and the problem of crosstalk of different colors of backlight is avoided.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a spatial light modulator according to an embodiment of the present invention, where the spatial light modulator shown in fig. 4 includes: a first liquid crystal panel 21 and a second liquid crystal panel 22 disposed opposite to each other; the first liquid crystal panel 21 and the second liquid crystal panel 22 are relatively bonded and fixed, for example, they may be bonded and fixed by the optical adhesive 23, or in other manners, they may also be fixed by other mechanical structures, and the specific fixing manner of the embodiment of the present invention is not particularly limited.
The first liquid crystal panel 21 and the second liquid crystal panel 22 each have a plurality of pixel units including at least a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. The sub-pixels in the two liquid crystal panels are arranged oppositely one by one, and the two opposite sub-pixels are a sub-pixel group 24; only the same color sub-pixels are oppositely arranged. It is assumed that the first sub-pixel group 241 has two opposite first sub-pixels, the second sub-pixel group 242 has two opposite second sub-pixels, and the third sub-pixel group 243 has two opposite third sub-pixels, the first sub-pixel is a blue sub-pixel B, the second sub-pixel is one of a red sub-pixel R and a green sub-pixel G, and the third sub-pixel is the other of the red sub-pixel R and the green sub-pixel G.
As shown in fig. 4, the color film structures of the first sub-pixel group 241 and the second sub-pixel group 242 are different, and the color film structures of the first sub-pixel group 241 and the third sub-pixel group 243 are different, so that the transmittance of the first sub-pixel group 241 to green light is not more than 2%.
In the embodiment of the present invention, the color film structures of the first sub-pixel group 241, the second sub-pixel group 242, and the third sub-pixel group 243 are different, so that the transmittance of the first sub-pixel group 241 to green light is not more than 2%, and therefore, the transmittance of two blue sub-pixels B in the first sub-pixel group 241 to green light in a green backlight time sequence can be greatly reduced, and the crosstalk problem of backlights with different colors is avoided.
Moreover, since the color film structures of the second sub-pixel group 242 and the third sub-pixel group 243 are different from the color film structure of the first sub-pixel group 241, the transmittances of the second sub-pixel group 242 and the third sub-pixel group 243 to the respective corresponding backlights can be increased, so that the display brightness is increased.
As shown in fig. 4, in the first sub-pixel group 241, the blue sub-pixel B located in the first liquid crystal panel 21 is a first blue sub-pixel and has a first blue color resistance structure B1, and the blue sub-pixel B located in the second liquid crystal panel 22 is a second blue sub-pixel and has a second blue color resistance structure B2. By respectively arranging the first blue color resistance structure B1 and the second blue color resistance structure B2 in the first blue sub-pixel and the second blue sub-pixel, the transmittance of green light by two blue sub-pixels B in the first sub-pixel group 241 can be greatly reduced, so that the transmittance of green light is not more than 2%. The color filter structure in the first sub-pixel group 241 is a first color resistor structure, and in this manner, the first color resistor structure includes a first blue color resistor structure b1 and a second blue color resistor structure b2, and thicknesses of the first blue color resistor structure and the second blue color resistor structure b2 may be the same.
Fig. 5 shows the first blue color resistance structure b1, where fig. 5 is a schematic view of a first blue color resistance structure according to an embodiment of the present invention, and the first blue color resistance structure b1 shown in fig. 5 includes a transparent substrate 311 and a blue coloring material 321 disposed in the transparent substrate 311. In this embodiment, the blue coloring material 321 is uniformly mixed in the transparent base 311, and the liquid transparent base 311 in which the blue coloring material 321 is uniformly mixed may be coated on the color resistance region corresponding to the first blue sub-pixel through a coating process, thereby forming the first blue color resistance structure b 1.
As shown in fig. 6, fig. 6 is a schematic view of a second blue color resistance structure according to an embodiment of the present invention, the second blue color resistance structure b2 shown in fig. 6 includes a transparent substrate 321 and a blue coloring material 322 disposed in the transparent substrate 321, and the thickness of the second blue color resistance structure b2 is the same as that of the first blue color resistance structure b 1. In this way, the second blue color resistance structure b2 and the first blue color resistance structure b1 have the same structure, and can be prepared by the same process, or by a conventional blue color film color resistance process, and the manufacturing process is simple and the manufacturing cost is low.
Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of another spatial light modulator provided in an embodiment of the present invention, and fig. 8 is a schematic structural diagram of another second blue color resistance structure provided in an embodiment of the present invention, which is different from the manner shown in fig. 4 to 6 in that, in the manner shown in fig. 7 and 8, the second blue color resistance structure b2 includes a plurality of first transparent medium layers 41 and a plurality of second transparent medium layers 42 alternately stacked. In this embodiment, the refractive index of the first transparent medium layer 41 is different from that of the second transparent medium layer 42. The first transparent medium layers 41 and the second transparent medium layers 42 which are alternately stacked form a bragg reflector, and the bragg reflector can increase the transmittance of blue light and reflect green light by setting the thickness and the refractive index of each medium layer, so that the transmittance of two blue sub-pixels B in the first sub-pixel group 241 to blue backlight is improved, the transmittance of green backlight is reduced, the transmittance of two blue sub-pixels B in the first sub-pixel group 241 to green light is greatly reduced, and the transmittance of green light is not more than 2%.
In the embodiments shown in fig. 4 and 7, the second sub-pixel is the red sub-pixel R, and the third sub-pixel is the green sub-pixel G. In this embodiment, the second subpixel may be a green subpixel G, and the third subpixel may be a red subpixel R.
In this embodiment of the present invention, in the second sub-pixel group 242, only one second sub-pixel has the color film structure, and the color film structure of the second sub-pixel is a second color resistor structure; the second color resistance structure comprises a transparent substrate and a coloring material which is arranged in the transparent substrate and corresponds to the color of the second sub-pixel, wherein if the second sub-pixel is a red sub-pixel R, the coloring material is a blue coloring material, and if the second sub-pixel is a green sub-pixel G, the coloring material is a green coloring material; the second color resistance structure has the same thickness as the first blue color resistance structure b 1.
In this embodiment of the present invention, in the third sub-pixel group 243, only one third sub-pixel has the color film structure, and the color film structure of the third sub-pixel is a third color resist structure; the third color-resisting structure comprises a transparent substrate and a coloring material which is arranged in the transparent substrate and corresponds to the color of the third sub-pixel, wherein if the second sub-pixel is a red sub-pixel R, the coloring material is a blue coloring material, and if the second sub-pixel is a green sub-pixel G, the coloring material is a green coloring material; the third color resistance structure has the same thickness as the first blue color resistance structure b 1.
Based on the above description, the following describes the arrangement of the second color resistance structure and the third color resistance structure by taking the example as shown in fig. 4 and 7.
Of the two opposing red subpixels R of the second subpixel group 242, only the red subpixel R of the first liquid crystal panel 21 is provided with the second color resist structure, which is the red color resist structure R. The structure of the red color resistance structure r can be as shown in fig. 9, and fig. 9 is a schematic view of a red color resistance structure provided in an embodiment of the present invention, where the red color resistance structure r has a transparent substrate 41 and a red coloring material 42 disposed in the transparent substrate 41. The red coloring material 42 is uniformly mixed in the transparent base material 41.
Based on the spectrum diagram shown in fig. 3, since the blue color resistance structure b has a poor green light filtering effect, the problem can be solved by arranging the first blue color resistance structure b1 and the second blue color resistance b2, and the transmittance of the red color resistance structure r to green light and blue light is low and is less than 2%, so that blue light and green light can be well filtered by only arranging one layer of red color resistance structure r with the thickness equal to that of the first blue color resistance structure b 1. The thickness of the red color resistance structure r is equal to the thickness of the first blue color resistance structure b1, and the thickness is a standard value H. The standard value H is the thickness of the color resistance structure in the conventional single-layer liquid crystal panel.
In another manner, the second color resist structure may be provided in the second subpixel of the second liquid crystal panel 22.
Of the two opposite green sub-pixels G of the third sub-pixel group 243, only the green sub-pixel G of the first liquid crystal panel 21 is provided with a third color resistance structure, which is a green color resistance structure b. The structure of the green color resistance structure g can be as shown in fig. 10, and fig. 10 is a schematic view of a green color resistance structure provided in an embodiment of the present invention, where the green color resistance structure g includes a transparent substrate 51 and a green coloring material 52 disposed in the transparent substrate 51. The green coloring material 52 is uniformly mixed in the transparent base material 51. In other ways, the third color-resisting structure may be disposed in the third sub-pixel of the second liquid crystal panel 22.
Similarly, based on the spectrum chart shown in fig. 3, since the blue color resistance structure b has a poor green light filtering effect, the problem can be solved by setting the first blue color resistance structure b1 and the second blue color resistance b2, and the transmittance of the green color resistance structure g to red light and blue light is low, both being less than 2%, so that only one layer of the green color resistance structure g with the thickness equal to that of the first blue color resistance structure b1 is set, and blue light and red light can be well filtered. The thickness of the green color resistance structure g is equal to the thickness of the first blue color resistance structure b1, and the thickness is a standard value H.
Referring to fig. 11, fig. 11 is a schematic structural diagram of another spatial light modulator according to an embodiment of the present invention, in the spatial light modulator shown in fig. 11, in the second sub-pixel group 242, a second sub-pixel located in the first liquid crystal panel 21 has a first sub-color resistance structure, and a second sub-pixel located in the second liquid crystal panel has a second sub-color resistance structure; the first sub-color resistance structure and the second sub-color resistance structure respectively comprise a transparent base material and a coloring material which is arranged in the transparent base material and corresponds to the color of the second sub-pixel; the thickness of the first sub color resistance structure and the thickness of the second sub color resistance structure are both smaller than the thickness of the first blue color resistance structure b 1. This method is equivalent to dividing the second color resistance structure into two parts, which are the first sub-color resistance structure and the second sub-color resistance structure respectively, and the two parts are respectively disposed in the two second sub-pixels of the second sub-pixel group 242, so that the effect of effectively filtering other colors of backlight can be realized.
The sum of the thicknesses of the first sub color resistance structure and the second sub color resistance structure is equal to the first blue color resistance structure b 1. The first sub color resistance structure and the second sub color resistance structure can also be set to have the same thickness.
In the manner shown in fig. 11, the second sub-pixel is taken as the red sub-pixel R for explanation, and in this case, the first sub-color resistor structure is the first red resistor R1, and the second sub-color resistor structure is the second red resistor R2. In this manner, the implementation manner of the first color resistance structure is not limited to the manner shown in fig. 11, and may be any one of the first color resistance structures disclosed in the embodiment of the present invention, and the implementation manner of the third color resistance structure is not limited to the manner shown in fig. 11, and may be any one of the third color resistance structures disclosed in the embodiment of the present invention.
Based on fig. 11, the spatial light modulator according to the embodiment of the present invention can also be shown in fig. 12.
Referring to fig. 12, fig. 12 is a schematic structural diagram of another spatial light modulator according to an embodiment of the present invention, in a manner shown in fig. 12 based on the manner shown in fig. 11, in the second sub-pixel group 242, a second sub-pixel located in the first liquid crystal panel 21 further includes a first filling structure 51, the first sub-color-resistance structure is stacked and directly contacted with the first filling structure 51, and a second sub-pixel located in the second liquid crystal panel 22 further includes a second filling structure 52, the second sub-color-resistance structure is stacked and directly contacted with the second filling structure 52; the sum of the thickness of the first sub color resistance structure and the thickness of the first filling structure 51 is the same as the thickness of the first blue color resistance structure b 1. The sum of the thickness of the second sub color-resisting structure and the thickness of the second filling structure 52 can also be set to be the same as the thickness of the first blue color-resisting structure b 1. By arranging the filling structure, each sub-pixel of the same liquid crystal panel can have better flatness at least, and the problem of unevenness caused by different color resistance structures is avoided.
As shown in fig. 12, in the embodiment of the present invention, the first filling structure 51 is located on a side of the first sub color resistance structure close to the second liquid crystal panel 22, and the second filling structure 52 is located on a side of the second sub color resistance structure close to the first liquid crystal panel 21. The first filling structure 51 and the second filling structure 52 are both transparent dielectric layers, such as transparent optical glue. In this way, the first filling structure 51 and the second filling structure 52 are disposed between the first sub color resistance structure and the second sub color resistance structure, which is equivalent to a lens structure, and can play a role in modulating light, thereby achieving an effect of light path collimation.
Referring to fig. 13, fig. 13 is a schematic structural diagram of another spatial light modulator according to an embodiment of the present invention, in the spatial light modulator shown in fig. 13, in the third subpixel group 243, a third subpixel on the first liquid crystal panel 21 has a third subpixel structure, and a third subpixel on the second liquid crystal panel 22 has a fourth subpixel structure; the third sub-color-resistance structure and the fourth sub-color-resistance structure respectively comprise a transparent base material and a coloring material which is arranged in the transparent base material and corresponds to the color of the third sub-pixel; the thickness of the third sub color resistance structure and the thickness of the fourth sub color resistance structure are both smaller than the thickness of the first blue color resistance structure b 1. This approach is equivalent to dividing the third color resistance structure into two parts, which are respectively used as the third sub-color resistance structure and the fourth sub-color resistance structure, and the two parts are respectively disposed in the two third sub-pixels of the third sub-pixel group 243, so that the effect of effectively filtering other colors of backlight can be realized.
The sum of the thicknesses of the third sub color resistance structure and the fourth sub color resistance structure is equal to the first blue color resistance structure b 1. The third sub color resistance structure and the fourth sub color resistance structure may be set to have the same thickness.
In the manner shown in fig. 13, the third sub-pixel is the green sub-pixel G, and in this case, the third sub-color resistor structure is the first green color resistor G1, and the second sub-color resistor structure is the second green color resistor G2. In this manner, the implementation manner of the first color resistor structure is not limited to the manner shown in fig. 13, and may be any one of the first color resistor structures disclosed in the embodiment of the present invention, and the implementation manner of the second color resistor structure is not limited to the manner shown in fig. 13, and may be any one of the second color resistor structures disclosed in the embodiment of the present invention.
Based on fig. 13, the spatial light modulator according to the embodiment of the present invention can also be as shown in fig. 14.
Referring to fig. 14, fig. 14 is a schematic structural diagram of another spatial light modulator according to an embodiment of the present invention, in a manner shown in fig. 14 based on the manner shown in fig. 13, in the third sub-pixel group 243, a third sub-pixel located in the first liquid crystal panel 21 further includes a third filling structure 61, the third sub-color-resistance structure and the third filling structure 61 are stacked and directly contacted, and a fourth filling structure 62 is further included in the third sub-pixel located in the second liquid crystal panel 22, and the fourth sub-color-resistance structure and the fourth filling structure 62 are stacked and directly contacted; the sum of the thickness of the third sub color-resisting structure and the thickness of the third filling structure 61 is the same as the thickness of the first blue color-resisting structure b 1. It is also possible to set the sum of the thickness of the fourth sub color resistance structure and the thickness of the fourth filling structure 62 to be the same as the thickness of the first blue color resistance structure b 1. In the mode, the filling structure is arranged, so that each sub-pixel of the same liquid crystal panel has better flatness at least, and the problem of unevenness caused by different color resistance structures is avoided.
As shown in fig. 14, in the embodiment of the present invention, the third filling structure 61 is located on a side of the third sub color-resistance structure close to the second liquid crystal panel 22, and the fourth filling structure 62 is located on a side of the fourth sub color-resistance structure close to the first liquid crystal panel 21. The third filling structure 61 and the fourth filling structure 62 are both transparent dielectric layers, such as transparent optical glue. In this way, the third filling structure 61 and the fourth filling structure 62 are disposed between the third sub color resistance structure and the fourth sub color resistance structure, so that, relative to the lens structure, the lens structure can play a role in modulating light, and a light path collimation effect is achieved.
Optionally, the first sub color resistance structure and the third sub color resistance structure have the same thickness, and/or the second sub color resistance structure and the fourth sub color resistance structure have the same thickness. The thicknesses of the first sub color resistance structure and the third sub color resistance structure can be set to be equal to half of the thickness of the first blue color resistance structure b1, and the thicknesses of the second sub color resistance structure and the fourth sub color resistance structure can be set to be equal to half of the thickness of the first blue color resistance structure b 1.
As can be seen from the above description, in the spatial light modulator according to the embodiment of the present invention, the color film structures of the first sub-pixel group 241 and the second sub-pixel group 242 are different, and the color film structures of the first sub-pixel group 241 and the third sub-pixel group 243 are different, so that the transmittance of the first sub-pixel group to green light is not more than 2%.
The first color resistance structure in the first sub-pixel group 241 includes a first blue color resistance structure b1 and a second blue color resistance structure b2, the thickness of the second color resistance structure in the second sub-pixel group 242 is the same as that of the first blue color resistance structure b1, the thickness of the third color resistance structure in the third sub-pixel group 242 is the same as that of the first blue color resistance structure b1, and the thickness of the second color resistance structure in the second sub-pixel group 242 and that of the third color resistance structure in the third sub-pixel group 242 are both smaller than that of the first color resistance structure, so that the transmittance of the corresponding backlight in the second sub-pixel group 242 and the third sub-pixel group 242 can be improved, and the display brightness can be improved.
The following describes the beneficial effects of the spatial light modulator according to the embodiment of the present invention with reference to specific experimental data.
The transmittance of the color resist structure in a single liquid crystal panel in the spatial light modulator shown in fig. 2 is shown in table 1 below.
TABLE 1
| Transmittance (%) | Red color resistance structure | Green color resistance structure | Blue color resistance structure |
| Red backlight/638 nm | 95.62 | 0.20 | 1.18 |
| Green backlight/515 nm | 0.15 | 82.26 | 14.00 |
| Blue backlight/42 nm | 2.02 | 0.38 | 76.64 |
As can be seen from the transmittance of the color resistance structure of the single liquid crystal panel in fig. 2 shown in table 1, the transmittance of the blue color resistance structure to the green backlight is high, reaching 14%, which may cause the crosstalk problem of the light emitted from the blue sub-pixel during the display of the green backlight.
The transmittance of the color resist structure in the two liquid crystal panels in the spatial light modulator shown in fig. 2 is shown in table 2 below.
TABLE 2
| Transmittance (%) | Red color resistance structure | Green color resistance structure | Blue color resistance structure |
| Red backlight/638 nm | 91.43 | 0.00 | 0.01 |
| Green backlight/515 nm | 0.00 | 67.67 | 1.96 |
| Blue backlight/42 nm | 0.04 | 0.00 | 55.71 |
As can be seen from the transmittance of the color resistor structures of the two liquid crystal panels in fig. 2 shown in table 2, the problem of backlight crosstalk of different colors in a single liquid crystal plane can be solved by the combined action of the two color resistor structures in the two opposite sub-pixels in the two liquid crystal panels, but the green color resistor structure has a significantly lower transmittance for green light, resulting in a lower brightness of a green image.
The color resistance structure excess rate in the two liquid crystal panels in the spatial light modulator according to the embodiment of the present invention is shown in table 3 below.
TABLE 3
| Transmittance (%) | Red color resistance structure | Green color resistance structure | Blue color resistance structure |
| Red backlight/638 nm | 95.62 | 0.20 | 0.01 |
| Green backlight/515 nm | 0.15 | 82.26 | 1.96 |
| Blue backlight/42 nm | 2.02 | 0.38 | 55.71 |
As can be seen from the color resistance structure excess in the two liquid crystal panels in the spatial light modulator according to the embodiment of the present invention shown in table 3, the scheme according to the embodiment of the present invention not only reduces the transmittance of the blue color resistance to green light, so that the transmittance of the green light is 1.96 and less than 2%, which meets the requirement of the display standard, but also has a higher transmittance of the green color resistance to green backlight, which solves the problem of low brightness of the green color screen in table 2.
Based on the above embodiment, another embodiment of the present invention further provides a holographic 3D display device, where the structure of the holographic 3D display device may be as shown in fig. 1, and the holographic 3D display device includes:
the light source device 111, the light source device 111 is used for timing sequence emergent coherent red, green and blue three-color backlight;
a beam expanding and collimating assembly 112, configured to perform beam expanding and collimating processing on light emitted from the light source device 111;
the spatial light modulator 12 is used for sequentially performing phase modulation and amplitude modulation on the light emitted by the beam expanding and collimating assembly 112; the spatial light modulator 12 is the spatial light modulator according to any of the above embodiments;
the field lens 13 is at least used for improving the capability of marginal rays of the emergent rays of the spatial light modulator to enter the liquid crystal grating 14; the liquid crystal grating 14 is used to form a left-eye image and a right-eye image based on incident light.
By adopting the spatial light modulator in the embodiment of the invention, the holographic 3D display device can effectively reduce the transmittance of the blue sub-pixels opposite to the two liquid crystal panels in the spatial light modulator 12 to green light, so that the transmittance is less than 2%, the display requirement is met, and the display brightness can be improved. The spatial light modulator implementation can be described with reference to the above embodiments, and is not described herein again.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the holographic 3D display device disclosed in the embodiment, since it corresponds to the spatial light modulator disclosed in the embodiment, the description is simple, and the relevant points can be described with reference to the corresponding parts of the spatial light modulator.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in an article or device comprising the same element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A spatial light modulator, comprising:
the liquid crystal display panel comprises a first liquid crystal panel and a second liquid crystal panel which are oppositely arranged;
the first liquid crystal panel and the second liquid crystal panel are respectively provided with a plurality of pixel units, and the pixel units at least comprise red sub-pixels, green sub-pixels and blue sub-pixels;
the sub-pixels in the two liquid crystal panels are arranged oppositely one by one, and the two opposite sub-pixels are a sub-pixel group; setting a first sub-pixel group to be provided with two opposite first sub-pixels, setting a second sub-pixel group to be provided with two opposite second sub-pixels, setting a third sub-pixel group to be provided with two opposite third sub-pixels, wherein the first sub-pixel is a blue sub-pixel, the second sub-pixel is one of a red sub-pixel and a green sub-pixel, and the third sub-pixel is the other of the red sub-pixel and the green sub-pixel;
the color film structures of the first sub-pixel group and the second sub-pixel group are different, and the color film structures of the first sub-pixel group and the third sub-pixel group are different, so that the transmittance of the first sub-pixel group to green light is not more than 2%;
in the first sub-pixel group, the blue sub-pixel positioned on the first liquid crystal panel is a first blue sub-pixel and is provided with a first blue color resistance structure, and the blue sub-pixel positioned on the second liquid crystal panel is a second blue sub-pixel and is provided with a second blue color resistance structure; the first blue color resistance structure comprises a transparent substrate and a blue coloring material arranged in the transparent substrate;
in the second sub-pixel group, only one second sub-pixel has the color film structure, and the color film structure of the second sub-pixel is a second color resistance structure; the second color resistance structure comprises a transparent substrate and a coloring material which is arranged in the transparent substrate and corresponds to the color of the second sub-pixel; the second color resistance structure and the first blue color resistance structure have the same thickness.
2. The spatial light modulator of claim 1, wherein the second blue color-resist structure comprises a transparent substrate and a blue coloring material disposed in the transparent substrate, the second blue color-resist structure being the same thickness as the first blue color-resist structure.
3. The spatial light modulator of claim 1,
the second blue color resistance structure comprises a plurality of layers of first transparent medium layers and second transparent medium layers which are alternately stacked, and the refractive indexes of the first transparent medium layers and the second transparent medium layers are different.
4. The spatial light modulator according to claim 1, wherein only one of the third sub-pixels in the third sub-pixel group has the color filter structure, and the color filter structure of the third sub-pixel is a third color resist structure;
the third color-resisting structure comprises a transparent base material and a coloring material which is arranged in the transparent base material and corresponds to the color of the third sub-pixel; the third color resistance structure and the first blue color resistance structure have the same thickness.
5. The spatial light modulator according to claim 1, wherein in the third sub-pixel group, a third sub-pixel located in the first liquid crystal panel has a third sub-color resistance structure, and a third sub-pixel located in the second liquid crystal panel has a fourth sub-color resistance structure;
the third sub-color-resistance structure and the fourth sub-color-resistance structure respectively comprise a transparent base material and a coloring material which is arranged in the transparent base material and corresponds to the color of the third sub-pixel; the thickness of the third sub color resistance structure and the thickness of the fourth sub color resistance structure are both smaller than the thickness of the first blue color resistance structure.
6. The spatial light modulator of claim 5, wherein the third sub color-resist structure and the fourth sub color-resist structure have the same thickness.
7. A holographic 3D display device, comprising:
the light source equipment is used for emitting coherent red, green and blue three-color backlight in a time sequence manner;
the beam expanding and collimating assembly is used for expanding and collimating the light emitted by the light source equipment;
the spatial light modulator is used for sequentially carrying out phase modulation and amplitude modulation on the light emitted by the beam expanding and collimating component; the spatial light modulator is according to any of claims 1-6;
the field lens is at least used for improving the capability of marginal rays of the rays emitted by the spatial light modulator to enter the liquid crystal grating; the liquid crystal grating is used for forming a left eye image and a right eye image based on incident light.
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