CN103399427A - Viewpoint-number-controllable three-dimensional display device - Google Patents

Abstract

The invention relates to a stereoscopic display device with a controllable number of viewpoints, which is characterized in that it comprises: a display screen; a controllable grating and a control module; Set the grating as a light-transmitting area or an opaque area to realize 2D or 3D display mode. The present invention controls the periodic arrangement and distribution of the light-transmitting area and the light-shielding area of the controllable grating through the control module, and can form a 2D mode, a 3D mode with different numbers of viewpoints, or a blending mode of 2D and 3D. The invention has simple structure and low cost, and is compatible with 2D and 3D images or video signals, and especially can satisfy the display of 3D images or video signals with different viewpoint numbers on the market.

Description

Stereoscopic display device with controllable number of viewpoints

technical field

The invention relates to the field of stereoscopic display, in particular to a stereoscopic display device with controllable number of viewpoints.

Background technique

The slit grating stereoscopic display technology is to place a slit grating in front of the display screen. The slit grating modulates the image of the display screen and forms a parallax map at several viewpoints. The left and right eyes of the observer respectively obtain two images with parallax. And synthesize a three-dimensional picture in the brain;

Most of the existing slit gratings are fixed, such as CN200110045205.8, which cannot solve the problem of 2D/3D compatibility well, and the number of viewpoints is fixed. When the number of viewpoints of the film source does not match the number of viewpoints of the grating, the display effect is poor ;

The existing dynamic slit grating scheme also has problems in solving the compatibility of the number of viewpoints, such as CN200810246791.0, which can realize point-by-point switching of TN cell twisted liquid crystals, but requires row scanning or column scanning to drive, which increases driving costs and distorts The liquid crystal needs to be kept in the second state for a period longer than or equal to one scan period, which is inefficient for realizing a stereoscopic solution with adjustable viewpoints; another example is CN200910108949.2, a full-resolution stereoscopic display device, which uses high-quality The liquid crystal shutter material itself increases the manufacturing cost. For the realization of the stereoscopic display solution with controllable viewpoint number, the circuit drive is more complicated and the power consumption is higher;

To sum up, although the existing stereoscopic display technology has a solution for 2D/3D compatibility and viewpoint compatibility, there are problems such as high manufacturing cost, high power consumption, and low efficiency, and it is specifically designed to solve the problem of viewpoint compatibility. was not raised.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a stereoscopic display device with controllable viewpoints, which can realize 2D image display and 3D image display with different viewpoints by controlling the state of the controllable grating through the control module of the device. The invention has the advantages of simple structure, low cost, high efficiency, low power consumption, etc., and has application prospects.

The present invention is realized by adopting the following scheme: a stereoscopic display device with a controllable number of viewpoints, characterized in that it includes:

a display screen;

A controllable grating is arranged in front of the display screen; the controllable grating can be respectively set as a light-transmitting area or an opaque area by adding a bias voltage or not adding a bias voltage; wherein,

The controllable grating makes the controllable grating fully transparent by adding the same potential;

The controllable grating is set to a light-transmitting area and an opaque area by locally adding a bias voltage, and the periodic arrangement of the light-transmitting area and the light-shielding area is controlled to form a slit grating;

A control module, used to obtain the number of viewpoints of the display screen image, and control the allocation of the light-shielding area and the light-transmitting area of the controllable grating, so that the display screen is in different working mode states; the working mode states include:

In the first working mode state, the control module controls all the controllable gratings to be light-transmitting areas, and the stereoscopic display device works in 2D mode;

In the second working mode state, the control module controls the light-shielding area and the light-transmitting area of the controllable grating to be periodically arranged according to the number of viewpoints of the image or video signal, and controls the ratio of the light-shielding area to the light-transmitting area so that The ratio is greater than or equal to 1 and is an integer, and the working mode of the display device is 3D mode;

In the third working mode state, the control module controls the distribution of the light-shielding area and the light-transmitting area of the controllable grating, which can be divided into left and right double screens or multiple screens, and the images of 2D mode and different viewpoints can be independently realized between each screen Or the 3D mode of the video signal, so as to realize the fusion display of 2D and 3D. the

In one embodiment of the present invention, the controllable grating is a TN liquid crystal cell, which includes: a first polarizer, a first transparent substrate, a first electrode, a first alignment layer, a liquid crystal layer, a second Alignment layer, second electrode, second transparent substrate and second polarizer; wherein,

The first alignment layer is perpendicular to the alignment direction of the second alignment layer;

The first polarizer is perpendicular to the polarization direction of the second polarizer;

The first electrode is a surface electrode;

The second electrode is a strip electrode, and the strip electrode can be arranged in parallel in a single layer, or can be arranged in double or multilayer staggered in parallel;

The first electrode and the second electrode are connected to the control module, and the potential applied to the second electrode is controlled by the control module to be equal to the potential applied to the first electrode, so that the liquid crystal molecules in the liquid crystal layer do not Deflection occurs; or through the control module, there is a potential difference between the part of the second electrode and the first electrode, and the potential applied to the other part of the second electrode is equal to the potential applied to the first electrode, so that there is a potential difference The liquid crystal molecules in the liquid crystal layer in the region are deflected along the long axis direction, and the liquid crystal molecules in the liquid crystal layer in the region without potential difference do not deflect; wherein, in the region where the liquid crystal molecule deflection does not occur, incident light from the first polarizer The light rotated by 90° through the liquid crystal layer and emerges from the second polarizer; when the deflection region of liquid crystal molecules occurs, the liquid crystal layer loses its optical rotation, and the light incident from the first polarizer cannot exit from the second polarizer.

In an embodiment of the present invention, the plurality of second electrodes can be divided into N regions whose period is K as the number of viewpoints (N=0, 1, 2, 3...n, n is a positive integer), each K strip-shaped electrodes are included in each cycle, and by adding bias voltage or not adding bias voltage, the corresponding area of the adjacent K-1 strip-shaped electrode is opaque, which is a light-shielding area, and its width is W _b ; the Kth The corresponding area of the strip electrode is light-transmitting, which is a light-transmitting area, and its width is W _w ; the period width is W _s ; wherein,

Among them, u is the distance between the two eyes of a person, and the value is 65 mm; W _p is the pitch of adjacent sub-pixels of the display screen; k is the number of viewpoints, and its value is an integer of k≥2.

In an embodiment of the present invention, the control module controls the first electrode to be connected to a low potential, the NK+1~(N+1)K-1 strip electrodes are connected to a high potential, and the NK strip electrodes are connected to a low potential , and is equal to the potential of the first electrode; the corresponding regions of the controllable grating respectively form the light-shielding region and the light-transmitting region, so that the controllable grating forms a slit grating whose number of viewpoints is K. the

In an embodiment of the present invention, the control module controls the first electrode to be connected to a low potential, and the second electrodes are connected to a low potential, which is equal to the potential of the first electrode; the corresponding area of the controllable grating The light-transmitting region is formed so that the controllable grating is a fully light-transmitting grating.

In one embodiment of the present invention, the display screen is CRT, LCD, LED, ELD, OLED, FED or PDP; when the display screen is LCD, the first polarizer light and the polarized light emitted by the LCD display screen The polarizing direction of the sheets is the same, and the second polarizing sheet is perpendicular to the direction of the outgoing polarizing sheet of the LCD display;

In an embodiment of the present invention, the display screen is an LCD, the controllable grating does not contain a first polarizer, and the second polarizer is perpendicular to the direction of the output polarizer of the LCD screen.

The remarkable advantage of the present invention is that by controlling the distribution of the light-shielding area and the light-transmitting area of the controllable grating, the switch between the 2D mode and the 3D mode with different viewpoints can be realized, and it has the advantages of simple driving, simple structure, and simple process realization method.

the

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a stereoscopic display device with a controllable number of viewpoints provided by the present invention;

Fig. 2 is a schematic diagram of the state of two viewpoints of the stereoscopic display device provided by the present invention;

Fig. 3 is a schematic diagram of the stereoscopic realization device provided by the present invention in different working modes;

Fig. 4 is a schematic diagram of a controllable grating of a liquid crystal cell of a double-layer strip electrode provided by the present invention;

Fig. 5 is an explanatory diagram of a controllable grating of a liquid crystal cell of a double-layer strip electrode provided by the present invention;

Fig. 6 is a working principle diagram of a stereoscopic display device with controllable number of viewpoints provided by the present invention;

Fig. 7 is a side view of a liquid crystal cell controllable grating of a single-layer strip electrode provided by the present invention;

Fig. 8 is another controllable grating structure diagram of a liquid crystal cell provided by the present invention with double-layer strip electrodes;

Fig. 9 is a structure diagram of another liquid crystal cell controllable grating of a single-layer strip electrode provided by the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and related drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, but should not be considered as strictly reflecting the proportional relationship of geometric dimensions as a schematic diagram. Here, the referenced figures are schematic diagrams of idealized embodiments of the present invention, and the illustrated embodiments of the present invention should not be considered limited to the specific shapes of the regions shown in the figures, but include resulting shapes, such as manufacturing-induced deviation. In this embodiment, they are all represented by rectangles or ellipses, and the representations in the figure are schematic, but this should not be considered as limiting the scope of the present invention. The value of the number of viewpoints in this embodiment has a certain range, and the upper limit of the number of viewpoints can be modified according to actual needs in actual production. The value of the number of viewpoints in the embodiment is only an indicative value, but this should not be considered as limiting the scope of the present invention.

The present invention provides a stereoscopic display device with controllable number of viewpoints, characterized in that, comprising:

A display screen for displaying images or video signals in 2D or 3D mode;

A controllable grating is arranged in front of the display screen. The controllable grating can be respectively set to a light-transmitting area or an opaque area by adding a bias voltage or not adding a bias voltage; wherein,

The controllable grating makes the controllable grating fully transparent by adding the same potential;

The controllable grating is set to a light-transmitting area and an opaque area by locally adding a bias voltage, and the periodic arrangement of the light-transmitting area and the light-shielding area is controlled to form a slit grating;

A control module, used to obtain the number of viewpoints of the images in the 2D mode, 3D mode or 2D/3D blending mode of the display screen, and control the distribution of the light-shielding area and the light-transmitting area of the controllable grating, so that the display screen is in the Different working mode status; the described working mode status:

In the first working mode state, the control module controls all the controllable gratings to be light-transmitting areas, and the stereoscopic display device works in 2D mode;

In the second working mode state, the control module controls the light-shielding area and the light-transmitting area of the controllable grating to be periodically arranged according to the number of viewpoints of the image or video signal, and controls the ratio of the light-shielding area to the light-transmitting area so that The ratio is greater than or equal to 1 and is an integer, and the working mode of the display device is 3D mode;

In the third working mode state, the control module controls the distribution of the light-shielding area and the light-transmitting area of the controllable grating, which can be divided into left and right double screens or multiple screens, and the images of 2D mode and different viewpoints can be independently realized between each screen Or the 3D mode of the video signal, so as to realize the fusion display of 2D and 3D;

As shown in FIG. 1 , in the first embodiment of the present invention, a stereoscopic display device with a controllable number of viewpoints is provided, which is characterized in that it includes:

A display screen 11 for displaying images or video signals in 2D or 3D mode;

A controllable grating 12 is arranged in front of the display screen. The controllable grating can be respectively set to a light-transmitting area or an opaque area by adding a bias voltage or not adding a bias voltage; wherein,

The controllable grating makes the controllable grating fully transparent by adding the same potential;

The controllable grating is set to a light-transmitting area and an opaque area by locally adding a bias voltage, and the periodic arrangement of the light-transmitting area and the light-shielding area is controlled to form a slit grating;

A control module 13, used to obtain the number of viewpoints of the images in the 2D mode, 3D mode or 2D/3D blending mode of the display screen, and control the allocation of the light-shielding area and the light-transmitting area of the controllable grating, so that the display screen In different working mode states; said working mode states:

In the first working mode state, the control module controls all the controllable gratings to be light-transmitting areas, and the stereoscopic display device works in 2D mode;

In the second working mode state, the control module controls the light-shielding area and the light-transmitting area of the controllable grating to be periodically arranged according to the number of viewpoints of the image or video signal, and controls the ratio of the light-shielding area to the light-transmitting area so that The ratio is greater than or equal to 1 and is an integer, and the working mode of the display device is 3D mode;

In the third working mode state, the control module controls the distribution of the light-shielding area and the light-transmitting area of the controllable grating, which can be divided into left and right double screens or multiple screens, and the images of 2D mode and different viewpoints can be independently realized between each screen Or the 3D mode of the video signal, so as to realize the fusion display of 2D and 3D;

The principle of a stereoscopic display device with controllable number of viewpoints according to the first embodiment of the present invention is briefly described as follows.

Figure 1 is a schematic diagram of the overall structure of a three-dimensional display device with a controllable number of viewpoints under five viewpoints. In the figure, black bars represent the light-shielding area, and white bars represent the light-transmitting area. The width of the black and white bars within one cycle is 4: 1. Realize stereoscopic display with 5 viewpoints. The control module 13 controls the controllable grating 12 according to the change of the input signal of the display screen 11, so as to realize the 2D working mode and the 3D working mode with different numbers of viewpoints. As shown in Figure 2, the controllable grating 12 is controlled to work in the 3D mode of 2 viewpoints.

Figures 3a-3d are schematic diagrams of the stereoscopic realization device provided by the present invention in different working modes. In Fig. 3a, the controllable grating 12 is in a fully transparent state, and the device works in a 2D mode. Among them, the dotted line represents light transmission. In Fig. 3b, the ratio of the light-shielding area to the light-transmitting area within one cycle of the controllable grating 12 is 1:1, and the device is in a 3D mode with 2 viewpoints. In Fig. 3c, the ratio of the light-shielding area to the light-transmitting area within one cycle of the controllable grating 12 is 2:1, and the device is in a 3D mode with 3 viewpoints. In Fig. 3d, the ratio of the light-shielding area to the light-transmitting area within one cycle of the controllable grating 12 is 3:1, and the device is in a 3D mode with 4 viewpoints. In Fig. 3e, the controllable grating 12 is divided into a left area and a right area. The ratio of the light-shielding area to the light-transmitting area within one cycle of the left area is 1:1, and it is in a 3D mode with 2 viewpoints. The ratio of the transparent area is 3:1, and it is in the 3D mode with 4 viewpoints.

The structure of a stereoscopic display device with a controllable number of viewpoints according to the first embodiment of the present invention is further described as follows;

As shown in Figure 4, the controllable grating 12 is a TN liquid crystal cell, along the propagation direction of the optical path, including: a first polarizer 121, a first transparent substrate 122, a first electrode 123, a first alignment layer 124, a liquid crystal layer 125, a second alignment layer 126, a second electrode 127, a second transparent substrate 128, and a second polarizer 129; wherein,

The first alignment layer 124 is perpendicular to the alignment direction of the second alignment layer 126;

The first polarizer 121 is perpendicular to the polarization direction of the second polarizer 129;

The first electrode 123 is a surface electrode;

The second electrode 127 is a strip electrode, and the strip electrode can be arranged in parallel in a single layer, or can be arranged in two or more layers in staggered parallel; in this embodiment, the strips in which two layers are staggered in parallel are preferred. Shaped electrode 127;

The first electrode 123 and the second electrode 127 are connected to the control module, and the potential applied to the second electrode 127 is controlled by the control module 13 to be equal to the potential applied to the first electrode 123, so that the liquid crystal The liquid crystal molecules in the layer do not deflect; or through the control module 13, there is a potential difference between the part of the second electrode 127 and the first electrode 123, and the potential applied to the other part of the second electrode 127 is equal to that applied to the first electrode 123. The potential of an electrode 123, so that the liquid crystal molecules in the liquid crystal layer in the region with potential difference are deflected along the long axis direction, and the liquid crystal molecules in the liquid crystal layer in the region without potential difference are not deflected; In the region, the light incident from the first polarizer passes through the liquid crystal layer to rotate 90°, and can exit from the second polarizer; in the region where the liquid crystal molecule deflection occurs, the liquid crystal layer loses the optical rotation, and the light incident from the first polarizer Light cannot exit from the second polarizer;

；

；

； u为人两眼之间的间距，取值为65毫米；W_p为显示屏相邻子像素点距；k为视点数，其值k≥2的整数； As shown in Figure 5, a stereoscopic display device with a controllable number of viewpoints works in a four-viewpoint 3D mode; the plurality of second electrodes 127 can be divided into N regions with a period of 4 viewpoints (N=0, 1, 2, 3…….n, n is a positive integer), each cycle contains 4 strip electrodes, by adding bias voltage or no bias voltage, the adjacent 3 strip electrodes 51~53 correspond to The area is opaque and is a light-shielding area with a width of W _b ; the area corresponding to the fourth strip electrode 54 is light-transmissive and is a light-transmitting area with a width of W _w ; the period width is W _s ; wherein,

;

;

; u is the distance between the two eyes of a person, and the value is 65 mm; W _p is the pitch of adjacent sub-pixels of the display screen; k is the number of viewpoints, and its value is an integer of k≥2;

As shown in FIG. 5 , the control module 13 controls the first electrode 123 to be connected to V _com , the NK+1~(N+1)K-1 strip electrodes 51~53 are connected to V _off , and the NK strip electrodes 54 is connected to V _on , wherein, V _on =V _com ; the corresponding areas of the controllable grating 12 respectively form the light-shielding area and the light-transmitting area, so that the controllable grating 12 forms a slit grating whose number of viewpoints is K ;

As shown in Figure 6a, the control module controls the first electrode 13 to connect to 123V _com , and the second electrodes 127 to connect to V _on , wherein, V _on =V _com ; the corresponding area of the controllable grating 12 forms the transparent light area, so that the controllable grating 12 is a fully transparent grating;

Described display screen can be CRT, LCD, LED, ELD, OLED, FED, PDP; In the present embodiment, preferred LCD display screen, described first polarizer light 121 is identical with LCD display screen exit polarizer polarization direction , the second polarizer 129 is perpendicular to the exit polarizer direction of the LCD display screen;

The principle of a stereoscopic display device with a controllable number of viewpoints in the first embodiment provided by the present invention is further described as follows;

The controllable grating 12 uses the optical rotation of the liquid crystal cell and the screening of light by the polarizer, and controls the light-shielding area and the light-transmitting area by controlling the potential of the strip electrode 127 and the potential of the first electrode 123, and controls the proportional relationship between the two , forming a slit grating.

As shown in Figures 6a-6e, a stereoscopic display device with controllable number of viewpoints in this embodiment applies different bias voltages to several strip electrodes 127 and surface electrodes 123 to form different patterns of slit gratings. As shown in Figures 6a-6e, when the potential of the surface electrode 123 is V _com and the potential of the strip electrode 127 is V _off , the liquid crystal cell does not have optical activity, and the light is blocked by the second polarizer 129, which appears as a light-shielding area

As shown in Figure 6a, when the strip electrodes 123 are all connected to the V _on potential, the liquid crystal cell rotates at 90°, and the light incident by the first polarizer 121 can pass through the second polarizer 129, and the entire controllable grating exhibits For full light transmission, a stereoscopic display device with controllable number of viewpoints works in 2D mode; as shown in Figure 6b, when several strip electrodes 123 are periodically connected to V _on and V _off potentials, the controllable grating phase staggered performance For light transmission and shading, a stereoscopic display device with controllable number of viewpoints works in the 3D mode of 2 viewpoints; similarly, as shown in Figure 6c and Figure 6d, a stereoscopic display device with controllable viewpoints works in the 3D mode of 3 viewpoints and 4 viewpoints in 3D mode; as shown in Figure 6e, a stereoscopic display device with controllable viewpoints is divided into left and right screens, the left screen realizes 2D display, and the right screen realizes stereoscopic display with 2 viewpoints;

To sum up, by reasonably controlling the potential of the strip electrodes 123 , 2D mode and 3D stereoscopic display with any number of viewpoints can be realized. As shown in Figure 1, the controllable grating 12 is controlled by the control module 13, that is, the potential control of the strip electrodes 123 is controlled by the control module 13, and a stereoscopic view point controllable can be realized through corresponding hardware and software. display device.

the

The present invention provides a stereoscopic display device with a controllable number of viewpoints in the second embodiment, which is characterized in that it includes:

A display screen 11 for displaying images or video signals in 2D or 3D mode;

A controllable grating 12 is arranged in front of the display screen. The controllable grating can be respectively set to a light-transmitting area or an opaque area by adding a bias voltage or not adding a bias voltage; wherein,

The controllable grating makes the controllable grating fully transparent by adding the same potential;

The controllable grating is set to a light-transmitting area and an opaque area by locally adding a bias voltage, and the periodic arrangement of the light-transmitting area and the light-shielding area is controlled to form a slit grating;

A control module 13, used to obtain the number of viewpoints of the images in the 2D mode, 3D mode or 2D/3D blending mode of the display screen, and control the allocation of the light-shielding area and the light-transmitting area of the controllable grating, so that the display screen In different working mode states; said working mode states:

In the first working mode state, the control module controls all the controllable gratings to be light-transmitting areas, and the stereoscopic display device works in 2D mode;

In the second working mode state, the control module controls the light-shielding area and the light-transmitting area of the controllable grating to be periodically arranged according to the number of viewpoints of the image or video signal, and controls the ratio of the light-shielding area to the light-transmitting area so that The ratio is greater than or equal to 1 and is an integer, and the working mode of the display device is 3D mode;

In the third working mode state, the control module controls the distribution of the light-shielding area and the light-transmitting area of the controllable grating, which can be divided into left and right double screens or multiple screens, and the 2D mode and the number of different viewpoints can be independently realized between each screen. 3D mode of image or video signal, so as to realize 2D and 3D fusion display;

The working principle of the second embodiment of the present invention is substantially similar to that of the first embodiment, and the same parts will not be repeated here, and the differences from the first embodiment will be briefly described.

A stereoscopic display device with a controllable number of viewpoints, the strip electrodes 123 may be arranged in a single layer in parallel, or in two or more layers arranged in parallel; The strip electrode 123 of cloth, as shown in Figure 7,; View in viewing area, its spacing of adjacent single-layer strip electrode 123 just blocks the black matrix width between the sub-pixels of display screen; In addition, described display screen 11 is LCD , the controllable grating 12 does not contain a first polarizer, and the second polarizer 121 is perpendicular to the direction of the exit polarizer of the LCD display screen 11;

The structure of a stereoscopic display device with controllable number of viewpoints provided by the present invention is not limited to the above-mentioned embodiments, and the modification of Fig. 4 and Fig. 7 similar to Fig. 8 and Fig. 9 is still within the scope of protection of the present invention.

As shown in Figures 8 and 9, the controllable grating 12 is a liquid crystal cell device, along the optical path propagation direction, including: a first polarizer 121, a first transparent substrate 122, several strip electrodes 123, a first alignment layer 124, The liquid crystal layer 125 , the second alignment layer 126 , the transparent electrode surface 127 , the second transparent substrate 128 and the second polarizer 129 ; other structures and principles are similar to those of the first embodiment and will not be described here.

The above-listed preferred embodiments have further described the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included within the protection scope of the present invention. the

Claims (7)

1. A stereoscopic display device with controllable number of viewpoints, characterized in that, comprising: a display screen; A controllable grating is arranged in front of the display screen; the controllable grating can be respectively set as a light-transmitting area or an opaque area by adding a bias voltage or not adding a bias voltage; wherein, The controllable grating makes the controllable grating fully transparent by adding the same potential; The controllable grating is set to a light-transmitting area and an opaque area by locally adding a bias voltage, and the periodic arrangement of the light-transmitting area and the light-shielding area is controlled to form a slit grating; A control module, used to obtain the number of viewpoints of the display screen image, and control the allocation of the light-shielding area and the light-transmitting area of the controllable grating, so that the display screen is in different working mode states; the working mode states include: In the first working mode state, the control module controls all the controllable gratings to be light-transmitting areas, and the stereoscopic display device works in 2D mode; In the second working mode state, the control module controls the light-shielding area and the light-transmitting area of the controllable grating to be periodically arranged according to the number of viewpoints of the image or video signal, and controls the ratio of the light-shielding area to the light-transmitting area so that The ratio is greater than or equal to 1 and is an integer, and the working mode of the display device is 3D mode; In the third working mode state, the control module controls the distribution of the light-shielding area and the light-transmitting area of the controllable grating, which can be divided into left and right double screens or multiple screens, and the images of 2D mode and different viewpoints can be independently realized between each screen Or the 3D mode of the video signal, so as to realize the fusion display of 2D and 3D. 2. A stereoscopic display device with a controllable number of viewpoints according to claim 1, wherein the controllable grating is a TN liquid crystal cell, comprising: a first polarizer, a first transparent A substrate, a first electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second electrode, a second transparent substrate, and a second polarizer; wherein, The first alignment layer is perpendicular to the alignment direction of the second alignment layer; The first polarizer is perpendicular to the polarization direction of the second polarizer; The first electrode is a surface electrode; The second electrode is a strip electrode, and the strip electrode can be arranged in parallel in a single layer, or can be arranged in double or multilayer staggered in parallel; The first electrode and the second electrode are connected to the control module, and the potential applied to the second electrode is controlled by the control module to be equal to the potential applied to the first electrode, so that the liquid crystal molecules in the liquid crystal layer do not Deflection occurs; or through the control module, there is a potential difference between the part of the second electrode and the first electrode, and the potential applied to the other part of the second electrode is equal to the potential applied to the first electrode, so that there is a potential difference The liquid crystal molecules in the liquid crystal layer in the region are deflected along the long axis direction, and the liquid crystal molecules in the liquid crystal layer in the region without potential difference do not deflect; wherein, in the region where the liquid crystal molecule deflection does not occur, incident light from the first polarizer The light rotated by 90° through the liquid crystal layer and emerges from the second polarizer; when the deflection region of liquid crystal molecules occurs, the liquid crystal layer loses its optical rotation, and the light incident from the first polarizer cannot exit from the second polarizer. 3. A stereoscopic display device with a controllable number of viewpoints according to claim 1 or 2, wherein the plurality of second electrodes can be divided into N regions whose period is K as the number of viewpoints (N=0 , 1, 2, 3…….n, n is a positive integer), each cycle contains K strip electrodes, by adding bias or no bias, the adjacent K-1 strip electrodes The area is opaque and is a light-shielding area with a width of W _b ; the area corresponding to the Kth strip electrode is light-transmissive and is a light-transmitting area with a width of W _w ; the period width is W _s ; wherein,

Among them, u is the distance between the two eyes of a person, and the value is 65 mm; W _p is the pitch of adjacent sub-pixels of the display screen; k is the number of viewpoints, and its value is an integer of k≥2. 4. A stereoscopic display device with a controllable number of viewpoints according to claim 3, wherein the control module controls the first electrode to be connected to a low potential, and the first NK+1~(N+1)K- The first strip electrode is connected to a high potential, and the NKth strip electrode is connected to a low potential, which is equal to the potential of the first electrode; the corresponding areas of the controllable grating form the light-shielding area and the light-transmitting area, so that the The controllable grating forms a slit grating whose number of viewpoints is K. 5. A stereoscopic display device with a controllable number of viewpoints according to claim 3, wherein the control module controls the first electrode to be connected to a low potential, and the second electrodes are connected to a low potential, and are connected to The potentials of the first electrodes are equal; the corresponding area of the controllable grating forms the light-transmitting region, so that the controllable grating is a fully light-transmitting grating. 6. The stereoscopic display device with controllable number of viewpoints according to claim 1, characterized in that: the display screen is a CRT, LCD, LED, ELD, OLED, FED or PDP; when the display screen is an LCD , the polarization direction of the first polarizer is the same as that of the exit polarizer of the LCD screen, and the direction of the second polarizer is perpendicular to the exit polarizer of the LCD screen. 7. A stereoscopic display device with controllable number of viewpoints according to claim 6, wherein the display screen is an LCD, the controllable grating does not contain a first polarizer, and the second polarized light The film is perpendicular to the direction of the exit polarizing film of the LCD display.

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