TWI442132B - Phase modulator element, 2d/3d switchable display device, micro-lens array, 3d display device and backlight module - Google Patents

Description

Phase modulation component, switchable 2D/3D display device, microlens array, 3D display device and backlight module

The present invention relates to a phase modulation element and a microlens array, and more particularly to a switchable 2D/3D display device, a 3D display device, and a backlight module.

The liquid crystal display mainly includes a liquid crystal display panel and a backlight module. The backlight module is disposed under the liquid crystal display panel to provide a surface light source required for the liquid crystal display panel, so that the liquid crystal display can display the image.

A development direction of the liquid crystal display is to improve the display effect of the liquid crystal display, and a microlens array corresponding to the pixel is arranged therein to improve the concentration and brightness of the light displayed by each pixel. In general, the manufacturing method of the microlens array is to transfer the shape of the model to the substrate, and the substrate is made into a lens structure having a plurality of protruding surface designs and a refractive index distribution, and the process involves molding the molded substrate. Wait for complicated steps. Since the lens structure in the microlens array must be aligned to the pixels, the process needs to be very precise. With the development of high definition and miniaturization of liquid crystal displays, the size of pixels has continued to shrink. However, in general, the microlens array is limited by the process limit and it is difficult to accurately align the pixels, which makes it difficult for the liquid crystal display to achieve an ideal display effect.

The other direction of the liquid crystal display is to develop a liquid crystal display (also referred to as a 2D liquid crystal display) that generally displays a two-dimensional image display screen to display a three-dimensional image display screen (also referred to as a 3D liquid crystal display). The 3D display technology mainly separates the image light provided to the left and right eyes. One method is to divide the longitudinal pixels of the liquid crystal display panel into two parts for providing left-eye and right-eye signals, and attach phase retardation films of different optical axis directions, so that the phase of the outgoing light is different, and then the polarization of the left and right eyes is matched. 3D images can be viewed in glasses with different orientations. However, the technique of the phase retardation film is difficult and costly, and the use of the phase retardation film related to the polarization direction of the light reduces the light efficiency and resolution of the liquid crystal display. Further, the phase retardation film cannot be attached after being attached to the liquid crystal display panel. In the meantime, the liquid crystal display cannot be arbitrarily switched to display the 2D/3D image display screen, so the use is liable to be limited.

Although other techniques for replacing the phase retardation film have been developed, such as a two-layer phase modulation component and a residual phase modulation component that do not require a polarizer, the two-layer phase modulation component has disadvantages that it is not easy to manufacture. The residual phase modulation component has the disadvantage that the phase modulation of the light is too small. To increase the phase modulation variable, the thickness of the liquid crystal unit cell must be increased, which may cause the reaction time to become slow.

According to a first embodiment of the invention, a phase modulation element is provided. The phase modulation element includes a first electrode plate, a second substrate, and a liquid crystal mixture. The phase modulation element includes a first electrode plate, a second electrode plate, and a liquid crystal mixture. The first electrode plate and the second electrode plate are light transmissive and opposite. The liquid crystal mixture includes a blue phase liquid crystal and is disposed between the first electrode plate and the second electrode plate. In operating the phase modulation element, the bias between the first electrode plate and the second electrode plate is adjusted to produce a phase difference between the light passing through the liquid crystal mixture between the first electrode plate and the second electrode plate. .

According to a second embodiment of the present invention, a microlens array is provided. The microlens array includes an electrode plate, a substrate, and a liquid crystal mixture. The electrode plate is light transmissive. The substrate is opposite to the electrode plate. The substrate includes an electrode portion and a plurality of non-electrode portions. The non-electrode portions are permeable to light and separated from each other by the electrode portions. The liquid crystal mixture includes a blue phase liquid crystal and is disposed between the electrode plate and the substrate. During operation of the microlens array, there is a bias between the electrode plate and the electrode portion to deflect the direction of the light passing through the liquid crystal mixture between the electrode plate and the substrate.

According to a third embodiment of the present invention, a display device capable of switching 2D/3D is provided. The display device capable of switching 2D/3D includes a 2D liquid crystal display, a polarizing plate, and a phase modulation element. The 2D liquid crystal display includes a liquid crystal display panel. The polarizing plate is disposed on the liquid crystal display panel. The phase modulation element is disposed on the liquid crystal display panel. The phase modulation element includes at least a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate and a liquid crystal mixture. The first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are light transmissive. The first electrode plate is opposite to the second electrode plate. The third electrode plate is opposite to the fourth electrode plate. The first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are disposed on the same plane and are parallel to each other. The liquid crystal mixture includes a blue phase liquid crystal and is disposed between the first electrode plate and the second electrode plate and between the third electrode plate and the fourth electrode plate. In the process of operating the switchable 2D/3D display device, the phase modulation component is controlled to have a first bias between the first electrode plate and the second electrode plate, and between the third electrode plate and the fourth electrode plate With a second bias, the light emitted from the liquid crystal display panel will exit the display device after passing through the liquid crystal mixture between the first electrode plate and the second electrode plate and between the third electrode plate and the fourth electrode plate.

According to a fourth embodiment of the present invention, a 3D display device is provided. The 3D display device includes a liquid crystal display and a microlens array. The microlens array is disposed on the liquid crystal display. The microlens array includes an electrode plate, a substrate, and a liquid crystal mixture. The electrode plate is light transmissive. The substrate is opposite to the electrode plate. The substrate includes an electrode portion and a plurality of non-electrode portions. The non-electrode portions are permeable to light and separated from each other by the electrode portions. The liquid crystal mixture includes a blue phase liquid crystal and is disposed between the electrode plate and the substrate. In the process of operating the 3D display device, there is a bias between the electrode plate and the electrode portion to deflect the direction of the light passing through the liquid crystal mixture between the electrode plate and the substrate.

According to a fifth embodiment of the present invention, a backlight module is provided. The backlight module comprises a microlens array and one of different sub-pixels, a red light emitting diode, a green light emitting diode and a blue light emitting diode. The microlens array includes an electrode plate, a substrate, and a liquid crystal mixture. The electrode plate is light transmissive. The substrate is opposite to the electrode plate. The substrate includes at least an electrode portion, a first non-electrode portion, a second non-electrode portion, and a third non-electrode portion. The first non-electrode portion, the second non-electrode portion and the third non-electrode portion are permeable to light, separated from each other by the electrode portion and respectively correspond to the red light emitting diode, the green light emitting diode and the blue light emitting diode body. The liquid crystal mixture includes a blue phase liquid crystal and is disposed between the electrode plate and the substrate. In the process of operating the backlight module, the control electrode plate and the electrode portion have a bias voltage, and are deflected and emitted from the red light emitting diode, the green light emitting diode and the blue light emitting diode respectively. The direction of the red, green and blue light of the liquid crystal mixture between the electrode plate and the substrate.

Additional features and advantages of the invention will be set forth in the <RTIgt; The features and advantages of the invention will be realized and attained by the <RTIgt;

The above description of the invention and the following detailed description are merely illustrative of the invention, and the claimed invention is not limited thereto.

The following is a description of embodiments of the invention in various figures. In the various embodiments and illustrations of the invention, the same symbols represent the same or similar elements. It should be noted that the illustration shows a very simplified version rather than an exact size.

First Embodiment Phase Modulation Element

1 and 2 show perspective perspective views of a phase modulation element according to a first embodiment of the present invention. 3A to 3C are schematic diagrams of an effective optical index-ellipsoid of a phase modulation element. Figure 4 shows the results of the phase shifting element testing the phase shift of the light without attaching the polarizer to the polarizer attached to the different angles. Figures 5A and 5B show the results of testing the reaction time of the phase modulation element.

Referring to FIGS. 1 and 2, the phase modulation element 50 includes a liquid crystal mixture 10, an electrode plate 20, and an electrode plate 30. The liquid crystal mixture 10 is disposed between the electrode plate 20 and the electrode plate 30. The liquid crystal mixture 10 includes a blue phase liquid crystal 14. In the preferred embodiment, the blue phase liquid crystal 14 is a polymer stabilized blue phase liquid crystal, in which case the blue phase liquid crystal 14 has a relatively large blue phase temperature range. In other words, in order for the blue phase liquid crystal 14 to have a large blue phase temperature range, the liquid crystal mixture 10 may further include a polymer 18 capable of stabilizing the blue phase liquid crystal 14. The electrode plate 20 and the electrode plate 30 may be indium tin oxide (ITO).

The phase modulation element 50 can determine whether or not a phase difference is generated for light passing through the liquid crystal mixture 10 by adjusting the bias voltage between the electrode plate 20 and the electrode plate 30.

Referring to FIG. 1, for example, in the case where a bias voltage (or zero bias) is not applied between the electrode plate 20 and the electrode plate 30, the distribution of the blue phase liquid crystal 14 is along the long axis of the molecule. The directions are periodically spirally arranged to form a three-dimensional lattice arrangement structure (the spiral pattern of the virtual cylinder 12 in the figure can be used to understand the distribution of the blue phase liquid crystal 14), and the blue phase liquid crystal 14 has a double twist arrangement at the same time. . At this time, the blue phase liquid crystal 14 has optical isotropic properties, as shown in Fig. 3A, an equivalent refractive index ellipsoidal sphere. At this time, the phase modulation element 50 does not cause a phase difference to the light passing through the liquid crystal mixture 10.

When a non-zero bias is applied between the electrode plate 20 and the electrode plate 30, the molecular long axis direction of the blue phase liquid crystal 14 is converted into a direction parallel to the electric field caused by the bias voltage. Referring to FIG. 2, for example, when a bias voltage is applied between the electrode plate 20 and the electrode plate 30, the direction is perpendicular to the electrode plate 20 and the electrode plate 30 (or parallel to the normal of the electrode plate 20 and the electrode plate 30). In the electric field of the direction, the molecular long axis direction of the blue phase liquid crystal 14 becomes anisotropic with the electric field deflection perpendicular to the electrode plate 20 and the electrode plate 30, so that the equivalent refractive index ellipsoid of the blue phase liquid crystal 14 is not Isotropic, as shown in Figures 3B and 3C, the axial length in the vertical (or Z-axis) direction is greater than the axial length in the horizontal (or X-axis, Y-axis) direction, so the blue phase liquid crystal 14 has birefringence properties, The direction of the blue phase liquid crystal 14 has a different effect on the refraction of the light, which is the Kerr effect, at which time the phase modulation element 50 produces a phase difference with respect to the light passing through the liquid crystal mixture 10. Further, as the bias voltage is larger (the bias voltage V _{2 of} FIG. 3C is larger than the bias voltage V _{1 of} FIG. 3B), the difference between the axial length of the equivalent refractive index ellipsoid and the axial length of the horizontal direction is also The larger, that is, the greater the degree of birefringence, at which point the phase modulation element 50 can produce a greater degree of phase difference to the light passing through the liquid crystal mixture 10. In one embodiment, the phase modulation element 50 can produce a phase difference and a compensating effect on the oblique light, in addition to the phase difference of the light in the vertical direction.

Referring to Fig. 4, the phase modulation component is tested using a Mach-Zehnder interferometer (unpolarized red He-Ne laser, λ = 633 nm), and the saturation phase shift is obtained when a bias voltage of 160 Vms is applied. It is 1π and the phase difference is independent of polarization. In addition, the phase modulation element has a fast response speed. As shown in Fig. 5A and Fig. 5B, under an applied bias voltage of 160 Vrms, a 1 k Hz square wave, the rise time is about 90 μs, and the fall time is about 2.3 ms. The experiment also found that the thickness of the unit cell does not affect the response speed of the phase modulation element (not shown).

The structure and manufacturing method of the phase modulation element of the embodiment of the present invention are simple and low in cost compared to a general phase retardation film. The phase modulation element does not need to use an alignment layer, has a fast reaction speed, and is independent of polarization, so the light efficiency is good. In addition, the phase modulation element can increase the phase modulation of the light in a manner that increases the thickness and improves the material without adversely affecting the response speed.

Second Embodiment Microlens Array

Please refer to Fig. 6 for a perspective perspective view of the microlens array without biasing. Figure 7 is a schematic diagram showing the equivalent refractive index ellipsoid distribution of the microlens array under the application of a bias voltage. Figures 8A and 8B show the results of a microlens array with no bias applied to the charge side of the charge coupled device (CCD). Figures 9A and 9B show the results of a microlens array with a bias applied to the charge coupled device side.

Referring to FIG. 6, the microlens array 100 includes a liquid crystal mixture 60, an electrode plate 70, and a substrate 80. The liquid crystal mixture 60 is disposed between the electrode plate 70 and the substrate 80. The liquid crystal mixture 60 includes a blue phase liquid crystal 64. In a preferred embodiment, liquid crystal mixture 60 may further comprise a polymer 68 that stabilizes blue phase liquid crystal 64. The electrode plate 70 is light transmissive. The substrate 80 includes an electrode portion 84 and a non-electrode portion 82. The non-electrode portion 82 is light transmissive. Electrode portion 84 can be opaque or opaque. The non-electrode portion 82 may be constructed of a material that is not electrically conductive or an opening defined by the electrode portion 84. For example, referring to Fig. 7, the non-electrode portion 82 is an opening defined by the electrode portion 84.

In the preferred embodiment, the non-electrode portion 82 is circular and has a diameter W as shown in Figs. 6 and 7. In one embodiment, the non-electrode portion 82 has a diameter W of about 250 μm and a thickness of about 20 μm. Although the non-electrode portion 82 is not limited to a circular shape, it may include other shapes such as an ellipse, a triangle, a rectangle, and the like. The substrate 80 and the electrode plate 70 may also be disposed on the substrate 94 and the substrate 92, respectively, as shown in FIG. The substrate 94 and the substrate 92 are preferably transparent substrates that are not electrically conductive.

In a specific embodiment, a suitable proportion of a nematic liquid crystal, a chiral dopant, and a liquid crystalline monomer are mixed and injected into a liquid crystal cell unit cell. among. The liquid crystal cell has an aluminum electrode plate above it and an indium tin oxide (ITO) electrode plate below. The aluminum electrode plate has a circular opening. The temperature of the cell is then lowered until the blue phase liquid crystal lattice is stabilized, at which time the liquid crystal mixture has a blue phase, followed by irradiation with ultraviolet light for polymerization. Then, the liquid crystal polymerization monomer was separated to obtain a microlens array, and the characteristic analysis results thereof were shown in Fig. 8A, Fig. 8B, Fig. 9A and Fig. 9B.

Referring to FIG. 6, in the case where a bias voltage (or a bias voltage is zero) is not applied between the electrode plate 70 and the electrode portion 84, the blue phase liquid crystal 64 has optical isotropic properties, so that the liquid crystal mixture 60 pairs pass therethrough. The light has the same refractive index. Referring to FIG. 7, when a bias voltage is applied between the electrode portion 84 and the electrode plate 70, since the electric field distribution in the liquid crystal mixture 60 is uneven, the axial length distribution of the equivalent refractive index ellipsoid is not uniform, so Can deflect the direction of the light. In one embodiment, the light can be deflected to focus on the non-electrode portion 82. For example, in detail, when a direction vertical bias is applied between the electrode portion 84 and the electrode plate 70, the intensity (density) ratio of the electric field in the vertical (Z) direction with respect to the horizontal (X, Y) direction is non-linear. The direction from the center of the electrode portion 82 to the edge of the electrode portion 84 gradually becomes stronger (V ₃ < V ₄ < V ₅ ), and thus the birefringence effect on the light incident in, for example, the vertical (Z) direction is from the non-electrode portion. The direction from the center of the 82 to the edge of the electrode portion 84 gradually becomes stronger to deflect the direction of the light, and preferably the effect of focusing is generated on the non-electrode portion 82, so that the intensity of the light emitted from the non-electrode portion 82 becomes large ( Reference can be made to Figs. 8A, 8B, 9A and 9B). Since the microlens array 100 is independent of polarization, the light efficiency is good.

Compared with a general microlens array, the structure and manufacturing method of the microlens array of the embodiment of the present invention are simple and low in cost. In addition, the microlens array can increase the thickness or improve the material to increase the focus on the light. Therefore, the display effect can be improved.

Third Embodiment Switchable 2D/3D display device

Figure 10 is a perspective view showing a switchable 2D/3D display device according to a third embodiment of the present invention. Referring to FIG. 10, a phase modulation component 150 is disposed above the liquid crystal display panel 202 of the 2D liquid crystal display 200. The phase modulation component 150 can include, for example, a liquid crystal mixture 110, an electrode plate 120A, an electrode plate 120B, an electrode plate 120C, and an electrode. The plate 120D, the electrode plate 130A, the electrode plate 130B, the electrode plate 130C, the electrode plate 130D, the substrate 205, and the substrate 207.

Referring to Fig. 10, a liquid crystal mixture 110 is similar to the liquid crystal mixture 10 of the phase modulation element 50 as described in Figs. 1 and 2. The electrode plate 120A, the electrode plate 120B, the electrode plate 120C, the electrode plate 120D, the electrode plate 130A, the electrode plate 130B, the electrode plate 130C, and the electrode plate 130D are similar to the phase modulation element 50 as described in FIGS. 1 and 2 Electrode plate 20 and electrode plate 30. Therefore, the repeated parts are not described here. Substrate 205 and substrate 207 may, for example, comprise a transparent, non-conductive material. In one embodiment, the angle between the longitudinal direction of the electrode plate 120A, the electrode plate 120B, the electrode plate 120C, the electrode plate 120D, the electrode plate 130A, the electrode plate 130B, the electrode plate 130C, and the electrode plate 130D and the direction of the polarizing plate 204 is ± 45 degree.

Referring to FIG. 10, for example, the bias voltage between the electrode plate 120A and the electrode plate 130A, the electrode plate 120B and the electrode plate 130B, the electrode plate 120C and the electrode plate 130C, and the electrode plate 120D and the electrode plate 130D can be individually adjusted. The change can therefore control the effect of different regions of the phase modulation element 150 on the light to achieve the desired display. For example, in one embodiment, there is an identical bias between the electrode plate 120A and the electrode plate 130A and between the electrode plate 120C and the electrode plate 130C, and between the electrode plate 120B and the electrode plate 130B and the electrode. The plate 120D and the electrode plate 130D have another identical bias voltage, so that the phase modulation component 150 can generate different phase differences for the light emitted from different regions of the liquid crystal display panel 202 to achieve the effect of displaying a three-dimensional image display screen. When the bias voltage (or the bias voltage is zero) is applied to the phase modulation element 150, the two-dimensional image display screen of the 2D liquid crystal display 200 is directly displayed.

The process of the phase modulation element can be separated from the 2D liquid crystal display, so that the phase modulation element can be arbitrarily disposed on the 2D liquid crystal display or removed from the 2D liquid crystal display, and thus has a convenient advantage in use.

Fourth Embodiment 3D Display Device

Referring to Figure 11, there is shown a cross-sectional view of a 3D display device in accordance with a fourth embodiment of the present invention. Referring to FIG. 11, for example, the microlens array 100A is disposed on a liquid crystal display panel 402 of, for example, a 2D liquid crystal display 400. The microlens array 100A includes, for example, a liquid crystal mixture 60A, an electrode plate 70A, and a substrate 80A. The substrate 80A includes an electrode portion 84A, a non-electrode portion 82A, a non-electrode portion 82B, and a non-electrode portion 82C. Liquid crystal mixture 60A is similar to liquid crystal mixture 60 as described in Figure 6 or Figure 7. The electrode plate 70A is similar to the electrode plate 70 as described in Fig. 6 or Fig. 7. The substrate 80A (electrode portion 84A, non-electrode portion 82A, non-electrode portion 82B, and non-electrode portion 82C) is similar to the substrate 80 (electrode portion 84 and non-electrode portion 82) as described in FIG. 6 or FIG. Therefore, the repeated parts are not described here.

Referring to FIG. 11, the microlens array 100A can deflect the light emitted from the liquid crystal display panel 402 by adjusting the bias voltage between the electrode plate 70A and the electrode portion 84A by the regulation 100A. In one embodiment, a plurality of microlens arrays 100A each independently controlled by a bias voltage are disposed on the liquid crystal display panel 402, and the light emitted from different regions of the liquid crystal display panel 402 is deflected to the left and right eyes of the viewer respectively. The direction is carried out to achieve the effect of displaying 3D images.

Fifth Embodiment Backlight Module

Please refer to FIG. 12, which shows a cross-sectional view of a backlight module according to a fifth embodiment of the present invention. In Fig. 12, the microlens array 100B is disposed on the illumination source 300 of the liquid crystal display. Since the microlens array 100B is similar to the microlens array 100A as shown in FIG. 11, it will not be described again. For example, the light source 300 includes a red light emitting diode 302A, a green light emitting diode 302B, and a blue light emitting diode 302C corresponding to different pixels in one pixel. Since the microlens array 100B has a plurality of non-electrode portions 82D, 82E, and 82F corresponding to the red light emitting diode 302A, the green light emitting diode 302B, and the blue light emitting diode 302C, respectively, the microlens array 100B can be respectively The light emitted from the red light-emitting diode 302A, the green light-emitting diode 302B, and the blue light-emitting diode 302C produces a focusing effect to improve light efficiency.

Compared with a general microlens array, the structure and manufacturing method of the microlens array of the embodiment of the present invention are simple and low in cost. In addition, the microlens array can increase the thickness or improve the material to increase the focus on the light. Therefore, there is great potential for application in a smaller pixel display device to accurately align the pixel unit and improve the display effect.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10, 60, 60A, 110. . . Liquid crystal mixture

12. . . Virtual cylinder

14, 64. . . Blue phase liquid crystal

18. . . polymer

20, 30, 70, 70A, 120, 120A, 120B, 120C, 120D, 130A, 130B, 130C, 130D. . . Electrode plate

50, 150. . . Phase modulation component

68. . . polymer

80, 80A. . . Substrate

82, 82A, 82B, 82C, 82D, 82E, 82F. . . Non-electrode part

84, 84A. . . Electrode part

92, 94, 205, 207. . . Substrate

100, 100A, 100B. . . Microlens array

200, 400. . . 2D LCD

202, 402. . . LCD panel

204. . . Polarizer

300. . . Light source

302A. . . Red light emitting diode

302B. . . Green light emitting diode

302C. . . Blue light emitting diode

W. . . diameter

1 and 2 show perspective perspective views of a phase modulation element according to a first embodiment of the present invention.

3A to 3C are schematic views of an equivalent refractive index ellipsoid of the phase modulation element according to the first embodiment of the present invention.

Figure 4 shows the results of the phase shifting element testing the phase shift of the light without attaching the polarizer to the polarizer attached to the different angles.

Figures 5A and 5B show the results of testing the reaction time of the phase modulation element.

Referring to Fig. 6, there is shown a perspective perspective view of the microlens array according to the second embodiment of the present invention without applying a bias.

Fig. 7 is a view showing an equivalent refractive index ellipsoidal distribution of a microlens array according to a second embodiment of the present invention under application of a bias voltage.

Figures 8A and 8B show the results of a microlens array with no bias applied to the charge side of the charge coupled device.

Figures 9A and 9B show the results of a microlens array with a bias applied to the charge coupled device side.

Figure 10 is a perspective view showing a switchable 2D/3D display device according to a third embodiment of the present invention.

Figure 11 is a cross-sectional view showing a 3D display device in accordance with a fourth embodiment of the present invention.

Figure 12 is a cross-sectional view showing a backlight module in accordance with a fifth embodiment of the present invention.

60. . . Liquid crystal mixture

64. . . Blue phase liquid crystal

70. . . Electrode plate

68. . . polymer

80. . . Substrate

82. . . Non-electrode part

84. . . Electrode part

100. . . Microlens array

W. . . diameter

Claims (12)

A phase modulation element comprising: a first electrode plate permeable to light; a second electrode plate permeable to light and opposite to the first electrode plate; and a third electrode plate Is permeable to light; a fourth electrode plate permeable to light, and relative to the third electrode plate, the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode The plate systems are disposed on the same plane and are parallel to each other; and a liquid crystal mixture comprising a blue phase liquid crystal, wherein the liquid crystal mixture is disposed between the first electrode plate and the second electrode plate and the third electrode plate and the Between the fourth electrode plates; in the process of operating the phase modulation element, the first electrode plate and the second electrode plate are controlled to have a first bias voltage, the third electrode plate and the fourth electrode Having a second bias between the plates, the light emitted from the liquid crystal display panel passes through the first electrode plate and the second electrode plate and the liquid crystal between the third electrode plate and the fourth electrode plate The mixture is then ejected from the display device. A display device capable of switching 2D/3D, comprising: a 2D liquid crystal display comprising a liquid crystal display panel; a polarizing plate disposed on the liquid crystal display panel; and a phase modulation component disposed on the liquid crystal display panel The phase modulation component includes at least: a first electrode plate that is transparent to light; and a second electrode plate that is transparent to light and opposite to the first An electrode plate; a third electrode plate permeable to light; a fourth electrode plate permeable to light, and opposite to the third electrode plate, the first electrode plate, the second electrode plate, The third electrode plate and the fourth electrode plate are disposed on the same plane and are parallel to each other; and a liquid crystal mixture includes a blue phase liquid crystal, and the liquid crystal mixture is disposed on the first electrode plate and the second electrode plate. And between the third electrode plate and the fourth electrode plate; in the process of operating the switchable 2D/3D display device, the phase modulation component is regulated to the first electrode plate and the second electrode plate There is a first bias between the third electrode plate and the fourth electrode plate, and a light emitted from the liquid crystal display panel passes through the first electrode plate and the second The electrode plate and the liquid crystal mixture between the third electrode plate and the fourth electrode plate are then ejected from the display device. The switchable 2D/3D display device of claim 2, wherein a longitudinal direction of the first electrode plate, the second electrode plate, the third electrode plate, and the fourth electrode plate is different from the The direction of the polarizer. The switchable 2D/3D display device of claim 2, wherein the first bias voltage and the second bias voltage are regulated during operation of the switchable 2D/3D display device In the same case, the switchable 2D/3D display device displays a two-dimensional image display screen. The switchable 2D/3D display device of claim 4, wherein the first bias voltage and the second bias voltage are both zero. Switchable 2D/3D display as described in item 2 of the patent application scope The display device, wherein during the operation of the switchable 2D/3D display device, when the first bias voltage and the second bias voltage are adjusted to be different, the switchable 2D/3D display device displays a three-dimensional Image display screen. A phase modulation component comprising: a first electrode plate permeable to light; a substrate opposite to the first electrode plate, the substrate comprising a second electrode plate, the second electrode plate comprising an electrode a portion and a plurality of non-electrode portions, the non-electrode portions are permeable to light and separated from each other by the electrode portion; and a liquid crystal mixture comprising a blue phase liquid crystal, the liquid crystal mixture being disposed on the electrode plate and the substrate The first electrode plate, the second electrode plate, and the liquid crystal mixture form a microlens array, and during the operation of the microlens array, the electrode plate is controlled to have a bias between the electrode plate and the electrode portion. Pressing to deflect the direction of the light passing through the liquid crystal mixture between the electrode plate and the substrate. The phase modulation element of claim 7, wherein the shape of the non-electrode portion comprises a circle, an ellipse, a triangle or a rectangle. The phase modulation element of claim 7, wherein the light is focused on the non-electrode portion. A 3D display device comprising: a liquid crystal display; and a phase modulation component according to claim 7 of the invention, disposed on the liquid crystal display, wherein the first electrode is controlled during operation of the 3D display device A bias is provided between the plate and the second electrode plate to deflect a direction of light passing through the liquid crystal mixture between the first electrode plate and the second electrode plate. A backlight module comprising: a red light emitting diode, a green light emitting diode and a blue light emitting diode; and a phase modulation component according to claim 7 of the patent application scope, The plurality of non-electrode portions include: a first non-electrode portion, a second non-electrode portion and a third non-electrode portion, the first non-electrode portion, the second non-electrode portion and the third non-electrode portion The light-transmissive portion is separated from each other by the electrode portion and corresponds to the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode, respectively, in the process of operating the backlight module. Adjusting a bias between the first electrode plate and the second electrode plate to deflect and respectively exit from the red light emitting diode, the green light emitting diode and the blue light emitting diode The direction of the red light, the green light, and the blue light of the liquid crystal mixture between the first electrode plate and the second electrode plate. The backlight module of claim 11, wherein in the process of operating the backlight module, the red light, the green light, and the blue light are respectively focused on the first non-electrode portion, the first Two non-electrode portions and the third non-electrode portion.