CN109782430B - Holographic display device and driving method thereof - Google Patents
Holographic display device and driving method thereof Download PDFInfo
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- CN109782430B CN109782430B CN201910223837.5A CN201910223837A CN109782430B CN 109782430 B CN109782430 B CN 109782430B CN 201910223837 A CN201910223837 A CN 201910223837A CN 109782430 B CN109782430 B CN 109782430B
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Abstract
The embodiment of the invention discloses a holographic display device and a driving method of the holographic display device. The holographic display device includes: the device comprises a first substrate and a second substrate which are arranged opposite to each other, a pixel unit arranged between the first substrate and the second substrate, a phase modulation module arranged on the light emitting side of the pixel unit, and microfluidic lenses which are arranged on the light emitting side of the phase modulation module and correspond to the pixel unit one by one; the phase modulation module is used for carrying out phase modulation on the arriving light; the microfluidic lens is used for adjusting the focal length of the microfluidic lens by controlling the shape of the conductive liquid drop in the microfluidic lens, so that the light rays modulated by the phase position are subjected to holographic display after passing through the corresponding microfluidic lens. The embodiment of the invention solves the problem that chromatic aberration exists in the color holographic display obtained by final superposition due to different RGB wavelengths and different focal lengths of the lens to RGB in the conventional holographic display technology.
Description
Technical Field
The present application relates to, but not limited to, the field of holographic display technologies, and more particularly, to a holographic display device and a driving method of the holographic display device.
Background
With the development of display technology and the widespread application of display devices, holographic display technology is being applied to step-by-step and three-dimensional (3Dimensions, abbreviated as 3D) display.
Color holographic displays require the reconstruction of images recorded at different wavelengths (i.e., different colors), and the resulting reconstructed images must be accurately superimposed to obtain a correct color display. However, in the existing color holographic display technology, chromatic aberration is caused by different wavelengths of different pixels, and in practical applications, the lens has different focal lengths for light with three primary colors, namely Red, Green and Blue (Red, Green and Blue, abbreviated as RGB), so that RGB cannot be accurately focused together, and thus chromatic aberration occurs in the color holographic display obtained by final superposition.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a holographic display device and a driving method of the holographic display device, so as to solve the problem that chromatic aberration exists in a color holographic display obtained by final superposition due to different RGB wavelengths and different focal lengths of a lens to RGB in the conventional holographic display technology.
An embodiment of the present invention provides a holographic display device, including: the liquid crystal display device comprises a first substrate and a second substrate which are arranged opposite to each other, a pixel unit arranged between the first substrate and the second substrate, a phase modulation module arranged on the light emitting side of the pixel unit, and microfluidic lenses which are arranged on the light emitting side of the phase modulation module and correspond to the pixel unit one by one;
the phase modulation module is used for performing phase modulation on the light which is emitted by the pixel unit and reaches the phase modulation module;
the microfluidic lens is used for adjusting the focal length of the microfluidic lens by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light rays modulated by the phase modulation module are subjected to holographic display after passing through the corresponding microfluidic lens.
Optionally, in the holographic display device as described above, the microfluidic lens comprises: the first electrode, the conductive liquid drop, the waterproof layer, the hydrophobic layer and the second electrode are sequentially arranged on one side, close to the second substrate, of the phase modulation module.
Optionally, the holographic display device as described above further includes: a processing module connected to the microfluidic lens;
the processing module is used for applying voltage to the first electrode and the second electrode of the microfluidic lens and changing the height, the contact angle and the curvature radius of the conductive liquid drop so as to adjust the focal length of the microfluidic lens.
Optionally, in the holographic display device as described above, the phase modulation module includes: the third electrode, the first alignment layer, the liquid crystal layer, the second alignment layer and the fourth electrode are sequentially arranged on one side, close to the second substrate, of the pixel unit, and a third substrate is arranged between the phase modulation module and the microfluidic lens.
Optionally, in the holographic display device as described above, the fourth electrode of the phase modulation module and the first electrode of the microfluidic lens are the same electrode, and the third substrate is disposed between the first electrode and the conductive droplet.
Optionally, the holographic display device as described above further includes: a pixel array layer disposed between the first substrate and the pixel unit;
and the third electrode of the phase modulation mode is a common electrode of the Thin Film Transistor (TFT) in the pixel array layer.
Optionally, in the holographic display device as described above, the processing module is further connected to the TFT in the pixel array layer and the phase modulation module;
the processing module is further configured to send color information and luminance information of the holographic image to be displayed to the TFT in the pixel array layer, so that the TFT controls the corresponding pixel unit to emit light;
the processing module is further configured to send phase information of a holographic image to be displayed to the phase modulation module, so that the phase modulation module performs phase modulation on the arriving light according to the phase information, and the phase-modulated light is subjected to holographic display after passing through a corresponding microfluidic lens.
An embodiment of the present invention further provides a driving method of a holographic display device, where the driving method is executed by the holographic display device described in any of the above paragraphs, where the driving method includes:
carrying out phase modulation on light rays which are emitted by the pixel units and reach the phase modulation module;
the focal length of the microfluidic lens is adjusted by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light modulated by the phase modulation module passes through the corresponding microfluidic lens and then is subjected to holographic display.
Optionally, in the method for driving a holographic display device as described above, the microfluidic lens includes a first electrode, the conductive droplet, and a second electrode, and the adjusting a focal length of the microfluidic lens includes:
applying a voltage to the first electrode and the second electrode of the microfluidic lens to change the height, contact angle, and radius of curvature of the conductive droplet to adjust the focal length of the microfluidic lens.
Optionally, in the method for driving a holographic display device, the holographic display device further includes a pixel array layer, and the method further includes:
sending color information and brightness information of a holographic image to be displayed to a Thin Film Transistor (TFT) in the pixel array layer, so that the TFT controls a corresponding pixel unit to emit light;
and sending the phase information of the holographic image to be displayed to the phase modulation module, so that the phase modulation module performs phase modulation on the arriving light according to the phase information, and the phase-modulated light passes through the corresponding microfluidic lens and then is subjected to holographic display.
Embodiments of the present invention further provide a computer-readable storage medium, where executable instructions are stored, and when executed by a processor, the computer-readable storage medium may implement the method for driving a holographic display device according to any of the above descriptions.
The holographic display device comprises a first substrate and a second substrate which are arranged opposite to each other, a pixel unit arranged between the first substrate and the second substrate, a phase modulation module arranged on the light emitting side of the pixel unit, and microfluidic lenses which are arranged on the light emitting side of the phase modulation module and are in one-to-one correspondence with the pixel unit, wherein the phase modulation module can perform phase modulation on light rays which are emitted by the pixel unit and reach the phase modulation module, and the size of the focal length of the microfluidic lenses can be adjusted by controlling the shape of conductive liquid drops in the microfluidic lenses, so that the light rays modulated by the phase modulation module are subjected to holographic display after passing through the corresponding microfluidic lenses. The holographic display device provided by the invention adopts the property that the microfluidic lens has adjustable focal length, and can accurately superpose holographic images formed by different pixel units, such as RGB (red, green and blue) three colors together, thereby improving and even eliminating the problem of chromatic aberration in the conventional holographic display, namely realizing the low-chromatic-aberration color holographic display device. In addition, the phase adjustment module in the embodiment of the invention is arranged in the display panel, so that the integration level of the whole holographic display device is better, the whole thickness of the holographic display device is facilitated, and the whole device is thinner and thinner.
Drawings
The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and are not intended to limit the invention.
FIG. 1 is a schematic diagram of a lens for producing different focal lengths for different wavelengths of light;
FIG. 2 is a schematic diagram of a holographic display effect in the prior art;
FIG. 3 is a schematic structural diagram of a holographic display device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a principle of image reconstruction using a holographic display device according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another holographic display device provided in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the working principle of a microfluidic lens in a holographic display device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a holographic display device according to another embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a holographic display device according to another embodiment of the present invention;
fig. 9 is a flowchart of a driving method of a holographic display device according to an embodiment of the present invention;
fig. 10 is a flowchart of another driving method of a holographic display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the conventional color holographic display technology, pixels of RGB primary colors are taken as an example to illustrate, and an image recorded in one pixel (including RGB) needs to be reconstructed, however, a lens generates different focal lengths for light with different wavelengths (i.e., RGB), and the longer the wavelength is, the larger the focal length is. Fig. 1 is a schematic diagram illustrating a principle that a lens generates different focal lengths for Light with different wavelengths, and fig. 2 is a schematic diagram illustrating a holographic display effect in the prior art, where fig. 1 and fig. 2 both illustrate a set of RGB as an example, it can be seen in fig. 1 that, because a wavelength of red Light is the largest and a focal length is the largest, when an image recorded by RGB is reconstructed by using the lens based on the difference in focal lengths generated by the lens for RGB, Light of RGB passes through a Spatial Light Modulator (SLM) and then irradiates onto the same lens, and a reconstruction plane where the image of RGB is irradiated by the lens, it can be seen that it is difficult to accurately superimpose images (a set of RGB) within one pixel to obtain a correct color holographic display image, thereby generating chromatic aberration.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 3 is a schematic structural diagram of a holographic display device according to an embodiment of the present invention. The holographic display device 10 provided by the present embodiment may include: the liquid crystal display device includes a first substrate 110 and a second substrate 120 arranged opposite to each other, a pixel unit 130 arranged between the first substrate 110 and the second substrate 120, a phase modulation module 150 arranged on a light-emitting side of the pixel unit 130, and microfluidic lenses 140 arranged on the light-emitting side of the phase modulation module 150 and corresponding to the pixel units 130 one by one.
In the above structure of the embodiment of the present invention, the phase modulation module 150 is configured to perform phase modulation on the light emitted by the pixel unit 130 and reaching the phase modulation module 150;
the microfluidic lens 140 is configured to adjust a focal length of the microfluidic lens 140 by controlling a shape of the conductive droplet 142 in the microfluidic lens 140, so that the light modulated by the phase modulation module 150 passes through the corresponding microfluidic lens 140 to perform holographic display.
The holographic Display device 10 provided in the embodiment of the present invention is a Display device capable of implementing holographic 3D Display, and a Display panel in the holographic Display device 10 may be an Organic Light-Emitting Diode (OLED) panel, a Liquid Crystal Display (LCD) panel, or other types of Display panels. The holographic display device 10 shown in fig. 3 uses the first substrate 110 as a lower substrate, the second substrate 120 as an upper substrate, the first substrate 110 and the second substrate 120 can be transparent substrates, such as glass substrates, and the light-emitting side of the pixel unit 130 is a side facing the second substrate 120, for example, the phase modulation module 150 and the microfluidic lens 140 are located between the pixel unit 130 and the second substrate 120, the phase modulation module 150 is close to the pixel unit 130, the microfluidic lens 140 is close to the second substrate 120, and only three pixel units 130 with different colors (RGB) are shown in fig. 3, based on the conventional structure of the display panel, a black matrix 131 is further disposed between adjacent pixel units 130, the black matrix 131 is used for separating the pixel units 130, a pixel array layer 160 is further disposed on a side of the first substrate 110 close to the pixel unit 130, the peripheries of the first substrate 110 and the second substrate 120 are encapsulated by a frame sealing adhesive (not shown in fig. 3), the Thin Film Transistor (TFT) in the pixel array layer 160 is used to control the corresponding pixel unit 130 to emit light.
In the embodiment of the present invention, the phase modulation of the light is corresponding to each pixel, for example, one pixel may include R, G, B three sub-pixels (i.e. R, G, B three pixel units 130), the phase modulation module 150 shown in fig. 3 is disposed inside the display panel, specifically between the pixel unit 130 and the micro-fluid lens 140, and can receive the light emitted from the pixel units 130, the light emitted from all the pixel units 130 in the display panel forms an image on the phase modulation module 150, since the image reaching the phase modulation module 150 has only color and brightness information, i.e., a two-dimensional image, the phase modulation module 150 performs phase modulation on each pixel in the two-dimensional image (i.e., the image formed by the light emitted from each pixel unit 130) to form a holographic image, so that the light emitted from the pixel unit 130 has phase information that can realize holographic display before entering the microfluidic lens 140.
It should be noted that the phase modulation module 150 in the embodiment of the present invention is, for example, a spatial light modulator, and can change the phase of light to implement holographic display; the phase modulation module 150 may perform phase modulation according to a known phase map (i.e., phase information of each pixel in an image to be displayed), that is, the phase modulation of each pixel may be different, and the phase information may be pre-stored in the phase modulation module 150, or may be sent to the phase modulation module 150 by the processor of the holographic display device 10 in real time. In addition, the embodiment of the present invention does not limit the specific structure of the phase modulation module 150, and for example, the phase modulation may be performed on the pixels of the hologram to be displayed by using the deflection of the liquid crystal layer in the liquid crystal module, and the deflection direction and the phase change of the liquid crystal are different, or the phase modulation may be performed by using other structures.
In the embodiment of the present invention, the number of the microfluidic lenses 140 is the same as that of the pixel units 130, and the microfluidic lenses 140 are disposed in a one-to-one correspondence manner, that is, one microfluidic lens 140 is disposed on the light emitting side of each pixel unit 130, and since the light emitted by the pixel unit 130 is modulated by the phase modulation module 150, the microfluidic lens 140 is located on the light emitting side of the phase modulation module 150, specifically, between the phase modulation module 150 and the second substrate 120. In addition, in the vertical position relation, the micro-fluid lens 140 overlaps the corresponding pixel unit 130 in the orthogonal projection area of the plane where the pixel unit 130 is located, the micro-fluid lens 140 in the embodiment of the present invention is a core function device for implementing low chromatic aberration color holographic display in the holographic display device 10, and since the micro-fluid lens 140 has an adjustable focal length different from the lens with a fixed focal length in the conventional holographic display technology, in the holographic display technology, when images recorded by different pixel units 130 (for example, a red pixel unit 130, a green pixel unit 130, and a blue pixel unit 130) to be reconstructed and superimposed are targeted, the shapes of the conductive droplets 142 in the micro-fluid lens 140 corresponding to different pixel units 130 (i.e., RGB) can be adjusted, so that the images recorded by the several pixel units 130 (i.e., RGB) can be superimposed accurately. It should be noted that, in the embodiment of the present invention, since the light reaching the micro-fluid lens 140 has been phase-modulated by the phase modulation module 150, that is, the light after being phase-modulated and before reaching the micro-fluid lens 140 has the performance of holographic display, the three sub-pixels (i.e., R, G, B three pixel units 130) in the above-mentioned one pixel can realize color holographic display by the accurately superimposed image after being image-reconstructed by the micro-fluid lens 140; in the holographic display device 10 according to the embodiment of the present invention, the core structure for realizing the low chromatic aberration effect is the micro-fluid lens 140, and the core structure for realizing the holographic display is the phase modulation module 150.
Compared with a solid lens in the conventional holographic display technology, the microfluidic lens 140 in the embodiment of the present invention is very flexible, the focal length of the microfluidic lens 140 can be changed by adjusting the shape of the conductive liquid droplet in the microfluidic lens 140, the microfluidic lens 140 adopts an electrowetting (electrowetting) technology, and electrowetting refers to a phenomenon that the wettability of the conductive liquid droplet on the solid surface is changed by applying an electric field, that is, a contact angle is changed, so that the conductive liquid droplet is deformed and displaced. The following embodiments of the present invention are illustrated by taking R, G, B as an example of the pixel units 130 in the display panel 100, where each R/G/B is a pixel unit 130, and the light-emitting side of each pixel unit 130 has one-to-one micro-fluid lens 140 corresponding to it, that is, the focal length of each micro-fluid lens 140 can be adjusted according to the wavelength of the light emitted by its corresponding pixel unit 130 and the requirement of the reconstructed image, so that when the holographic display device 10 reconstructs an image, the images recorded by different wavelengths (i.e. different colors, such as RGB) can be precisely superimposed to obtain the correct color holographic display effect through the converging effect of the micro-fluid lens 140 with the set focal length. As shown in fig. 4, which is a schematic diagram of a principle of image reconstruction by using the holographic display device according to the embodiment of the present invention, it can be seen that one pixel shown in fig. 4 includes R, G, B three sub-pixels (i.e., R, G, B three-color pixel units 130), light emitted by R, G, B three pixel units 130 in one pixel is firstly phase-modulated by the phase modulation module 150, and the phase-modulated light is converged by the microfluidic lens 140 and then reconstructed to the same region of a reconstruction plane, that is, holographic images formed by RGB three-color light are precisely superimposed together, so that chromatic aberration in the conventional color holographic display is reduced or even eliminated.
It should be noted that, in the embodiment of the present invention, the microfluidic lens 140 is used to improve the chromatic aberration problem in the color holographic display technology, and the holographic display device 10 may be implemented by using a conventional photolithography process and an evaporation process, or may be implemented by using a 3D printing/3D printing process.
The holographic display device 10 provided by the embodiment of the present invention includes a first substrate 110 and a second substrate 120 disposed on a box, a pixel unit 130 disposed between the first substrate 110 and the second substrate 120, a phase modulation module 150 disposed on a light emitting side of the pixel unit 130, and microfluidic lenses 140 disposed on the light emitting side of the phase modulation module 150 and corresponding to the pixel units 130 one by one, wherein the phase modulation module 150 can perform phase modulation on light emitted by the pixel unit 130 and reaching the phase modulation module 150, and the size of the focal length of the microfluidic lenses 140 can be adjusted by controlling the shape of conductive droplets 142 in the microfluidic lenses 140, so that the light modulated by the phase modulation module 150 passes through the corresponding microfluidic lenses 140 to perform holographic display. The holographic display device 10 provided by the invention adopts the property that the microfluidic lens 140 has adjustable focal length, and can accurately superpose holographic images formed by different pixel units 130, such as RGB (red, green and blue) three colors, so that the problem of chromatic aberration in the conventional holographic display is improved or even eliminated, namely, the display device for low-chromatic-aberration color holographic display is realized.
Further, the phase adjustment module 150 in the embodiment of the present invention is disposed inside the display panel, so that the integration level of the whole holographic display device 10 is better, the whole thickness of the holographic display device 10 is facilitated, and the whole device is thinner and thinner.
Optionally, fig. 5 is a schematic structural diagram of another holographic display device provided in the embodiment of the present invention. Based on the structure of the holographic display 10 shown in fig. 3, in an embodiment of the present invention, the microfluidic lens 140 includes: the first electrode 141, the conductive liquid drop 142, the water-blocking layer 143, the hydrophobic layer 144, and the second electrode 145 are sequentially disposed on one side of the phase modulation module 150 close to the second substrate 120, and the frame sealing adhesive 190 is illustrated in fig. 5.
The structure of the micro-fluidic lens 140 according to the embodiment of the invention is shown in fig. 5, wherein the first electrode 141 is a lower electrode of the conductive droplet 142, and the second electrode 145 is an upper electrode of the conductive droplet 142, and the shape of the conductive droplet 142 in the micro-fluidic lens 140 is adjustable, i.e. the size of the focal length of the micro-fluidic lens 140 is determined by the shape of the conductive droplet 142.
It should be noted that, the isolation column 146 is provided between the conductive droplets 142 of adjacent microfluidic lenses 140, a plurality of microfluidic lenses 140 may have a common first electrode 141, a water-blocking layer 143, and a hydrophobic layer 144, and between different microfluidic lenses 140, the conductive droplets 142 and the second electrode 145 are independent structures. In addition, the plurality of micro fluid lenses 140 may have independent first electrodes 141, and each micro fluid lens 140 may be independently controlled when a voltage is applied. The embodiment shown in fig. 5 is illustrated with a plurality of microfluidic lenses 140 employing a common first electrode 141.
In practical applications, the conductive droplet 142 in the microfluidic lens 140 may be a conductive ink, the water blocking layer 143 may be deionized water, and the isolation pillar 146, that is, a Pixel Wall (Pixel Wall), is used to separate adjacent microfluidic lenses 140, because the conductive droplet 142 is a structure in the microfluidic lens 140 that plays a key role in the focal length, the shape of the conductive droplet 142 determines the focal length of the microfluidic lens 140, and therefore, the isolation pillar 146 is actually used to separate the conductive droplet 142 in the adjacent microfluidic lenses 140.
Optionally, in an embodiment of the present invention, the method further includes: a processing module (not shown in fig. 5) connected to the microfluidic lens 140;
the processing module is used for applying voltage to the first electrode 141 and the second electrode 145 of the microfluidic lens 140 to change the height, the contact angle and the curvature radius of the conductive liquid drop 142.
In the embodiment of the present invention, the device for controlling the shape of the conductive liquid droplet 142 in the microfluidic lens 140 may be a Processing module, such as a Central Processing Unit (CPU) of the holographic display device 10. In a possible implementation manner of the embodiment of the present invention, the plurality of micro-fluidic lenses 140 employ a common first electrode 141, the processing module may apply a reference voltage to the first electrode 141 shared by the plurality of micro-fluidic lenses 140, where the reference voltage is constant, and apply independent voltages to the second electrodes 145 of different micro-fluidic lenses 140 to control the shapes of the conductive droplets 142 in different micro-fluidic lenses 140; in a possible implementation manner of the embodiment of the present invention, the independent first electrodes 141 are used for different microfluidic lenses 140, and the processing module may apply voltages to the first electrodes 141 and the second electrodes 145 of different microfluidic lenses 140, respectively, so as to control the shapes of the conductive droplets in the different microfluidic lenses. In the embodiment of the present invention, an electric field can be generated by applying a voltage to the electrodes at two ends of the micro-fluidic lens 140, so as to change the wettability of the conductive liquid droplet 142 on the solid surface, i.e., change the contact angle and the shape of the conductive liquid droplet 142, as shown in fig. 6, which is a schematic diagram of the working principle of the micro-fluidic lens in the holographic display device provided in the embodiment of the present invention, it can be seen that the voltage applied between the first electrode 141 and the second electrode 145 is gradually increased, the contact angle of the conductive liquid droplet 142 is gradually decreased, the contact area with the solid interface is gradually increased, the height of the conductive liquid droplet 142 is decreased, and the radius of curvature of the vertex of the conductive liquid droplet 142 is increased along with the increase of the applied voltage, so as to achieve the purpose of zooming.
Optionally, fig. 7 is a schematic structural diagram of another holographic display device provided in an embodiment of the present invention. Based on the structure of the holographic display device 10 shown in fig. 5, in the embodiment of the present invention, the phase modulation module 150 may include: a third electrode 151, a liquid crystal layer 152, and a fourth electrode (the fourth electrode in fig. 7 is the same as the first electrode 141) sequentially disposed on one side of the pixel unit 130 close to the second substrate 120; a first alignment layer is further disposed between the liquid crystal layer 152 and the third electrode 151, a second alignment layer (not shown in fig. 7) is further disposed between the liquid crystal layer 152 and the fourth electrode, and a third substrate 170 is disposed between the phase modulation module 150 and the micro-fluid lens 140.
As shown in fig. 7, the phase modulation module 150 according to the embodiment of the invention has a structure in which the third electrode 151 is a lower electrode of the liquid crystal layer 152, and the fourth electrode (i.e., the first electrode 141 in fig. 7) is an upper electrode of the liquid crystal layer 152. In practical applications, in order to reduce the film structure in the holographic display device 10, the upper electrode of the phase modulation module 150 and the lower electrode of the microfluidic lens 140 may share the first electrode 141, that is, the fourth electrode of the phase modulation module 150 and the first electrode 141 of the microfluidic lens 140 are the same electrode (the first electrode 141 is illustrated in fig. 7), and in this structure, the thickness of the entire device may be further reduced by the shared electrode structure. In addition, since the phase modulation module 150 includes the liquid crystal layer 152, the liquid crystal layer 152 needs to be protected by a package structure, and therefore, the third substrate 170 may be disposed between the first electrode 141 and the conductive liquid droplet 142.
In the embodiment of the present invention, fig. 7 provides a schematic illustration of a liquid crystal structure as the phase modulation module 150, and the deflection direction of light emitted from different pixel units 130 can be controlled by a liquid crystal layer, so as to perform phase modulation on an image reaching the phase modulation module 150, so as to achieve the purpose of holographic display. In addition, fig. 7 illustrates an example in which the plurality of micro fluid lenses 140 use the common first electrode 141, a constant voltage may be applied to the first electrode 141, the shape of the conductive droplet in the micro fluid lens 140 may be adjusted by controlling the magnitude of the voltage applied to the second electrode 145, and the phase modulation module 150 may adjust the deflection direction of each pixel by controlling the magnitude of the voltage applied to the third electrode 151.
It should be noted that, the phase adjustment of the phase modulation module 150 to the image is adjusted for each pixel (one pixel includes, for example, three pixel units 130 such as RGB in fig. 7), and the lower electrode (or the upper electrode) of the phase modulation module 150 in the embodiment of the present invention may be a shared electrode structure or an independent electrode structure. Since the first electrode 141 (the upper electrode of the phase modulation module 150) in fig. 7 is a common electrode structure, and the lower electrode (i.e., the third electrode 151) is an independent electrode structure, phase deflection in different directions and different magnitudes can be performed on different pixels; it should be noted that only one pixel (i.e., the pixel including the RGB three pixel units 130 in fig. 7) is illustrated in fig. 7, and the lower electrode (i.e., the third electrode 151) of the pixel in fig. 7 may share one lower electrode (i.e., the third electrode 151), and the deflection directions of the phase modulation are the same, but different lower electrodes (i.e., the third electrodes 151) are used between different pixels. In addition, if the plurality of micro fluid lenses 140 use the independent first electrodes 141, that is, the upper electrodes of the phase modulation modules 150 may use an independent electrode structure, and the lower electrodes (that is, the third electrodes) thereof may use an independent electrode structure or a common electrode structure. In addition, the embodiment of the present invention does not limit the structure in which the upper electrode of the phase modulation module 150 and the lower electrode of the micro-fluid lens 140 use a common electrode, and the respective electrodes may be independently disposed.
In addition, the first electrode 141, the second electrode 145, and the third electrode 151 in each embodiment of the present invention may be ITO electrodes.
As described in the foregoing embodiments, the holographic display device provided in the embodiments of the present invention includes the pixel array layer 160 for controlling the pixel unit 130 to emit light, and the pixel array layer 160 is located between the first substrate 110 and the pixel unit 130.
Optionally, fig. 8 is a schematic structural diagram of another holographic display device according to an embodiment of the present invention. On the basis of the structure of the holographic display device 10 shown in fig. 7, in the holographic display device 10 provided by the embodiment of the present invention, the third electrode 151 of the phase modulation module 150 is a common electrode of the TFT in the pixel array layer 160; in addition, in one pixel (including R, G, B three pixel cells 130) shown in fig. 8, a common electrode (i.e., the third electrode 151) is connected to a drain electrode of one TFT for controlling light emission of the pixel.
In the embodiment of the present invention, the number of electrode layers in the holographic display device 10 may also be reduced by using the phase modulation mold 150 and the pixel array layer 160 to share electrodes, which are the third electrode 151 of the phase modulation mold 150 and the common electrode in the pixel array layer 160, because in the structure of the holographic display device 10 shown in fig. 8, the upper electrode of the phase modulation mold 150 already shares the lower electrode (i.e., the first electrode 141) of the microfluidic lens 140, and therefore, the voltage magnitude of the common electrode of each pixel in the pixel array layer 160 is determined by the adjustment of the phase modulation mold 150 to the corresponding pixel, and the voltage magnitude of the common electrode of each pixel needs to be combined when applying voltages to the other electrodes of each pixel in the pixel array layer 160.
It should be noted that, if the upper electrode of the phase modulation mold 150 does not share an electrode with the lower electrode of the microfluidic lens 140, and the lower electrode of the phase modulation mold 150 is configured as an integrated electrode structure, a constant electrode may be applied to the lower electrode of the phase modulation mold 150 (i.e., the third electrode 151), and when the common electrode in the pixel array layer 160 shares the lower electrode of the phase modulation mold 150, the voltage applied to the common electrode may be a constant voltage.
In practical applications, as known from the structure of the conventional pixel array layer, the pixel array layer 160 may include a gate electrode 161, a first insulating layer 162, a source (or drain) electrode 163, an active layer 164, a second insulating layer 165 and a via hole 166, in which the gate electrode 161 and the source 163 and the drain 163 at both sides thereof are three pins of a TFT, the first insulating layer 162 and the second insulating layer 165 may be made of silicon nitride (SiNx), the active layer 164 may be made of amorphous silicon (a-Si), the via hole 166 may be made of Indium Tin Oxide (ITO), the via hole 166 serves to connect the drain 163 of the TFT with a common electrode (i.e., the third electrode 151) or connect the drain 163 of the TFT with a corresponding pixel unit 130, as shown in fig. 8, the TFT for applying a reference voltage to the common electrode (the leftmost TFT in fig. 8) has a drain 163 connected to the common electrode through the via hole 166, the reference voltage provided by the common electrode is common to all three pixel cells 130, and the drain 163 of each TFT among the TFTs (the three TFTs on the right side of fig. 8) for controlling R, G, B the three pixel cells 130 to emit light is connected to the corresponding pixel cell 130 and to the other electrode (not shown in fig. 8) of the pixel cell 130, and the source 163 of these TFTs are connected to a driving circuit board, which may be, for example, a processing module of the circuit board, and all voltages are provided through the processing module. It should be noted that the source and the drain of the TFT may be interchanged, and one electrode connected to the driving circuit board is generally defined as the source, and one electrode connected to the pixel unit 130 or the common electrode is generally defined as the drain.
Similar to the principle that the TFT in the pixel array layer 160 controls the pixel unit 130 to emit light, the voltage of the electrode in the microfluidic lens 140 connected to the TFT may also be controlled by the TFT, that is, a lens control layer 180 may be further disposed between the microfluidic lens 140 and the second substrate 120, and the structure of the lens control layer 180 is similar to that of the pixel array layer 160, and may also include: a gate electrode 181, a third insulating layer 182, a source (or drain) 183, an active layer 184, a fourth insulating layer 185 and a via 186, wherein one gate electrode 181 and the source 183 and the drain 183 at both sides thereof are three pins of one TFT, the third insulating layer 182 and the fourth insulating layer 185 are made of SiNx, the active layer 184 is made of amorphous silicon (a-Si), the via 186 is made of ITO, the via 186 is used for connecting the drain 183 of the TFT and the corresponding micro-fluid lens 140, the drain 183 of each TFT is connected to the corresponding micro-fluid lens 140 for controlling R, G, B the voltage level of the upper electrode (i.e., the second electrode 145) of the micro-fluid lens 140 corresponding to the three pixel units 130, the source 183 of the TFTs are connected to a driving circuit board, the lower electrode (i.e., the first electrode 141) of the micro-fluid lens 140 shown in fig. 8 is a common electrode, and the first electrode 141 is distributed over the whole surface, the first electrode 141 can be directly connected to a driving circuit board, such as a processing module of a circuit board, without the TFT for individual control, and all voltages are provided through the processing module. Note that, since the reference numerals in fig. 8 are more, the parts 141 to 146 are not marked in fig. 8, and the reference numerals 141 to 146 may refer to the holographic display device 10 shown in fig. 5 and 7.
Optionally, in an embodiment of the present invention, the processing module is further connected to the TFT in the pixel array layer 160 and the phase modulation module 150 (the processing module is not shown in fig. 8).
The processing module in the embodiment of the present invention is further configured to send color information and luminance information of the holographic image to be displayed to the TFT in the pixel array layer 160, so that the TFT controls the corresponding pixel unit 130 to emit light;
the processing module is further configured to send phase information of the holographic image to be displayed to the phase modulation module 150, so that the phase modulation module 150 performs phase modulation on the arriving light according to the received phase information, and the phase-modulated light passes through the corresponding microfluidic lens 140 and is then holographically displayed.
As shown in fig. 7 and 8, the holographic display device 10, in which R, G, B three-color pixel units 130 are illustrated in the display panel 100, has the following working principle: the processing module transmits color information and brightness information of a holographic image to be displayed to an electrode (for example, a source electrode 163) of a TFT controlling light emission of the pixel units 130 in an electrical signal manner, light emitted by each pixel unit 130 is subjected to phase modulation by the phase modulation module 150, the modulated light with the phase information passes through the corresponding microfluidic lens 140, and based on the capability of adjustability of the focal length of the microfluidic lens 140, light emitted by R, G, B three pixel units 130 is subjected to phase modulation by the phase modulation module 150, and then passes through the corresponding microfluidic lens 140 to generate a convergence effect corresponding to the lens focal length thereof, and the light is superimposed on a reconstruction plane under the convergence effect of the microfluidic lens 140, and an image formed by superimposing R, G, B three paths of light is a phase-modulated holographic image. In the above process, the focal length of the microfluidic lens 140 changes with the change of the voltage applied to the electrodes at the two ends, so that the holographic images formed by R, G, B three light paths are precisely superimposed together, thereby reducing or even eliminating the chromatic aberration in the existing color holographic display technology, i.e. realizing the color holographic display with low chromatic aberration.
The display panel in the embodiment of the present invention described in the above embodiment may be an OLED panel, or may be an LCD panel. The implementation of the holographic display 10 is illustrated below in different types of panels:
in a possible implementation manner of the embodiment of the present invention, the display panel is an OLED panel, the pixel unit 130 is a light emitting unit disposed between the phase modulation module 150 and the pixel array layer 160, and since the OLED panel is a self-light emitting type and the light emitting unit is a self-light emitting light source therein, fig. 3, 5, 7 and 8 in the embodiment of the present invention are all illustrated by taking the OLED panel as an example;
in another possible implementation manner of the embodiment of the present invention, the display panel is an LCD panel, and the pixel unit 130 includes a liquid crystal layer and a filtering unit disposed between the phase modulation module 150 and the pixel array layer 160, in this implementation manner, the holographic display device 10 further includes a backlight source disposed on a side surface of the first substrate 110 or a side of the first substrate 110 away from the pixel array layer 160.
The holographic display device 10 provided by the embodiment of the invention combines the electrowetting technology, optimizes the chromatic aberration problem in the existing color holographic display technology on the physical structure, and is beneficial to improving the display quality and improving the viewing experience of a user. In addition, in the holographic display device 10 provided in the embodiment of the present invention, the phase modulation module 150 is integrated inside the display panel, the light emitted by the pixel unit 130 is phase-modulated by the phase modulation module 150, and then the microfluidic lens 140 is used for chromatic aberration calibration, in the structure of the holographic display device 10, the phase modulation module 150 may have a common electrode with the microfluidic lens 140, and the phase modulation module 150 may also have a common electrode with the pixel array layer 160, which is beneficial to reducing the film structure of the whole holographic display device 10, thereby reducing the overall thickness of the holographic display device 10, making the whole device thinner and lighter, and being beneficial to the subsequent appearance design of the whole device.
Based on the holographic display device 10 provided in the above embodiment of the present invention, an embodiment of the present invention further provides a driving method of a holographic display device, where the driving method of the holographic display device is executed by the holographic display device provided in any of the above embodiments of the present invention, as shown in fig. 9, which is a flowchart of the driving method of the holographic display device provided in the embodiment of the present invention, and the driving method includes the following steps:
s210, carrying out phase modulation on the light which is emitted by the pixel unit and reaches the phase modulation module;
and S220, adjusting the focal length of the microfluidic lens by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light modulated by the phase modulation module passes through the corresponding microfluidic lens and then is subjected to holographic display.
The driving method provided by the embodiment of the present invention is executed by the holographic display device 10 in any one of the implementations shown in fig. 3 to fig. 8, and the specific structure of the holographic display device 10, wherein the functions implemented by each device and each film layer have been described in detail in the foregoing embodiments, and therefore, are not described herein again. The driving method in the embodiment of the invention has the following requirements on the holographic display device: the phase modulation module is required to be arranged on the light emitting side, and the focal lengths of the lenses corresponding to the pixel units one by one are adjustable, so that the focal length of the microfluidic lens can be adjusted by controlling the shapes of the conductive liquid drops in the microfluidic lens. Because the prior holographic display technology adopts the solid lens with fixed focal length and the lens can generate different focal lengths for light with different wavelengths, when an image recorded by different wavelengths (namely different colors) is reconstructed in color holographic display, due to different focal lengths of the light with different wavelengths, reconstructed images are difficult to be accurately superposed to obtain a correct color holographic display effect.
In the embodiment of the invention, the phase modulation module can receive the light rays emitted by the pixel units, the light rays emitted by all the pixel units in the display panel form images on the phase modulation module, and because the images reaching the phase modulation module only have color and brightness information, namely two-dimensional images, the phase modulation module performs phase modulation on each pixel (namely the image formed by the light rays emitted by each pixel unit) in the two-dimensional images to form holographic images, so that the light rays emitted by the pixel units have phase information capable of realizing holographic display before entering the microfluidic lens.
In the embodiment of the invention, an electrowetting technology is combined into the lens, the selected microfluidic lens is a core functional device for realizing low-chromatic aberration color holographic display in a holographic display device, and by utilizing the characteristic of focal length variability of the microfluidic lens, when images recorded by different pixel units (such as R, G, B pixel units) which need to be reconstructed and superposed are aimed at in the holographic display technology, the reconstructed images of the pixel units can be accurately superposed together by adjusting the shapes of conductive liquid drops in the microfluidic lens corresponding to the different pixel units, namely adjusting the focal lengths of the microfluidic lenses, so that the aim of low-chromatic aberration color holographic display is fulfilled. It should be noted that, in the embodiment of the present invention, since the light reaching the micro fluid lens has been subjected to the phase modulation by the phase modulation module, that is, the light after being subjected to the phase modulation and before reaching the micro fluid lens has the performance of holographic display, the image that is obtained by accurately superimposing the three sub-pixels (that is, R, G, B three pixel units 130) in the above-mentioned one pixel after the image reconstruction processing by the micro fluid lens can realize color holographic display; the core structure for realizing the low chromatic aberration effect is a micro-fluid lens, and the core structure for realizing the holographic display is a phase modulation module.
Compared with the solid lens in the prior holographic display technology, the microfluidic lens in the embodiment of the invention is very flexible, the focal length of the microfluidic lens can be changed by adjusting the shape of the conductive liquid drop in the microfluidic lens, the microfluidic lens adopts an electrowetting technology, and electrowetting refers to changing the wettability of the conductive liquid drop on the solid surface, namely changing a contact angle, so that the conductive liquid drop generates phenomena such as deformation, displacement and the like by externally adding an electric field. In the following embodiments of the present invention, each of the pixel units in the display panel is exemplified by R, G, B, each R/G/B is a pixel unit, and the light-emitting side of each pixel unit has a micro-fluid lens corresponding to the light-emitting side of the pixel unit, that is, the focal length of each micro-fluid lens can be adjusted according to the wavelength of the light emitted by the corresponding pixel unit and the requirement of the reconstruction pattern, so that when the holographic display device reconstructs an image, the convergence effect of the micro-fluid lenses with set focal lengths of the images recorded by different wavelengths (i.e., different colors, such as RGB) can be accurately superposed to obtain the correct color holographic display effect. Referring to the principle of image reconstruction shown in fig. 4, it can be seen that light rays emitted from different pixel units (e.g., one R, one G, and one B) are reconstructed to the same region of a reconstruction plane, i.e., holographic images formed by three colors of RGB are precisely superimposed together, thereby reducing or even eliminating chromatic aberration in the conventional color holographic display.
The driving method of the holographic display device provided by the embodiment of the invention is implemented by adopting the holographic display device in any one of the embodiments, the phase adjustment module can perform phase modulation on the light which is emitted by the pixel unit and reaches the phase adjustment module, and the size of the focal length of the microfluidic lens can be adjusted by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light modulated by the phase adjustment module is subjected to holographic display after passing through the corresponding microfluidic lens. The driving method of the holographic display device provided by the invention adopts the property that the microfluidic lens has focal length adjustability, and can accurately superpose holographic images formed by different pixel units, such as RGB (red, green and blue) three colors together, thereby improving and even eliminating the chromatic aberration problem in the conventional holographic display, namely realizing the low-chromatic aberration color holographic display device.
Alternatively, in the driving method provided by the embodiment of the present invention, the main structure of the microfluidic lens may include a first electrode, a conductive liquid drop, and a second electrode, and the specific structure of the microfluidic lens may refer to the holographic display device shown in fig. 5, fig. 7, and fig. 8, where the arrangement manner of the first electrode and the second electrode has been described in detail in the above embodiment, that is, a plurality of microfluidic lenses may have a common first electrode, or a plurality of microfluidic lenses may also have independent first electrodes, the arrangement manner of the first electrodes is different, and the manner of applying the voltage is different.
In the driving method provided in the embodiment of the present invention, adjusting the focal length of the microfluidic lens, that is, implementing the S220, may include:
and applying voltage to the first electrode and the second electrode of the microfluidic lens, and changing the height, the contact angle and the curvature radius of the conductive liquid drop so as to adjust the focal length of the microfluidic lens, so that the light rays modulated by the phase modulation module are subjected to holographic display after passing through the corresponding microfluidic lens.
In a possible implementation manner of the embodiment of the present invention, the plurality of micro-fluidic lenses use a common first electrode, a reference voltage may be applied to the common first electrode of the plurality of micro-fluidic lenses, the reference voltage is constant, and independent voltages are applied to the second electrodes of different micro-fluidic lenses to control the shapes of the conductive droplets in the different micro-fluidic lenses; in a possible implementation manner of the embodiment of the present invention, different microfluidic lenses use independent first electrodes, and voltages can be applied to the first electrodes and the second electrodes of the different microfluidic lenses, so as to control the shapes of the conductive droplets in the different microfluidic lenses. In the embodiment of the invention, an electric field can be generated by applying voltage to the electrodes at two ends of the micro-fluid lens, so that the wettability of the conductive liquid drop on the surface of the solid is changed, namely the contact angle and the form of the conductive liquid drop are changed, referring to the working principle of the micro-fluid lens shown in fig. 6, it can be seen that the voltage applied between the first electrode and the second electrode is gradually increased, the contact angle of the conductive liquid drop is gradually reduced, the contact area with the solid interface is gradually increased, the height of the conductive liquid drop is reduced, and the curvature radius of the vertex of the conductive liquid drop is increased along with the increase of the applied voltage, so that the purpose of zooming can be achieved.
Optionally, in the driving method provided in the embodiment of the present invention, the main structure of the phase modulation module may include a third electrode (lower electrode), a first alignment layer, a liquid crystal layer, a second alignment layer, and a fourth electrode (upper electrode), and the specific structure of the phase modulation module may refer to the holographic display device shown in fig. 5, fig. 7, and fig. 8. The arrangement of the third electrode and the fourth electrode has been described in detail in the above embodiment, that is, the fourth electrode may share the first electrode of the microfluidic lens, and when a plurality of microfluidic lenses have a shared first electrode, the third electrode of the phase modulation module has an independent electrode structure, or when a plurality of microfluidic lenses also have independent first electrodes, the third electrode of the phase modulation module may have a shared electrode structure or an independent electrode structure; in addition, the upper electrodes of the phase modulation modules may not share the lower electrodes of the micro-fluid lens, that is, the respective electrode structures may be independently provided, and the manner of applying the voltage may be determined based on the manner of providing the electrodes.
As described in the foregoing embodiments, the holographic display device provided by the embodiments of the present invention includes a pixel array layer for controlling light emission of the pixel unit, and the pixel array layer is located between the first substrate and the pixel unit.
Optionally, when the plurality of microfluidic lenses use a common first electrode and the upper electrode of the phase modulation module shares the first electrode, the common electrode of the TFT in the pixel array layer in the embodiment of the present invention may share the lower electrode (i.e., the third electrode) of the phase modulation module, and the specific structure is described in detail in the embodiments shown in fig. 7 and 8, and therefore, is not described again here. Fig. 10 is a flowchart of another driving method for a holographic display device according to an embodiment of the present invention, and based on the flowchart shown in fig. 9, the driving method according to an embodiment of the present invention may further include, before S210:
s200, sending color information and brightness information of the holographic image to be displayed to a TFT in a pixel array layer, so that the TFT controls a corresponding pixel unit to emit light;
before S210, the embodiment of the present invention may further include:
s201, sending phase information of the holographic image to be displayed to a phase modulation module;
correspondingly, the implementation manner of S210 in the embodiment of the present invention may include:
the phase modulation module performs phase modulation on the arriving light according to the received phase information;
accordingly, the implementation manner of S220 may include:
and applying voltage to the first electrode and the second electrode of the microfluidic lens, and changing the height, the contact angle and the curvature radius of the conductive liquid drop so as to adjust the focal length of the microfluidic lens, so that the light rays modulated by the phase modulation module are subjected to holographic display after passing through the corresponding microfluidic lens.
In the embodiment of the present invention, the holographic display device performs holographic display according to the following working principle: the color information and the brightness information of the holographic image to be displayed are transmitted to an electrode (for example, a source electrode) of a TFT (thin film transistor) for controlling the light emission of the pixel units in an electric signal mode, light emitted by each pixel unit is subjected to phase modulation through the phase modulation module 150, the modulated light with the phase information passes through the corresponding microfluidic lens, the modulated light has the adjustability based on the focal length of the microfluidic lens, and the light of the RGB pixel units is superposed together after being subjected to phase modulation. In the process, the focal length of the microfluidic lens is changed along with the change of the voltage applied to the electrodes at the two ends, so that holographic images formed by R, G, B three colors are accurately superposed together, and the chromatic aberration in the prior color holographic display technology is reduced or even eliminated, namely, the color holographic display with low chromatic aberration is realized.
It should be noted that, in the embodiment of the present invention, the display panel of the holographic display device for implementing the driving method may be an OLED panel or an LCD panel, and the implementation of different types of display panels has been described in the above embodiments, and therefore, no further description is given here.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores executable instructions, and when the executable instructions are executed by a processor, the method for driving a holographic display device according to any of the above embodiments of the present invention may be implemented, and the method for driving a holographic display device according to the above embodiments of the present invention may be used to drive the holographic display device according to the above embodiments of the present invention to perform display, so as to implement a transparent display effect of the holographic display device. The implementation of the computer-readable storage medium provided in the embodiment of the present invention is substantially the same as the driving method of the holographic display device provided in the above-mentioned embodiment of the present invention, and details thereof are not repeated herein.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A holographic display, comprising: the optical fiber micro-fluid lens array comprises a first substrate and a second substrate which are arranged oppositely to each other, a pixel unit arranged between the first substrate and the second substrate, a phase modulation module arranged on the light-emitting side of the pixel unit, and micro-fluid lenses which are arranged on the light-emitting side of the phase modulation module and correspond to the pixel unit one by one;
the phase modulation module is used for performing phase modulation on the light which is emitted by the pixel unit and reaches the phase modulation module to form a holographic image;
the microfluidic lens is used for adjusting the focal length of the microfluidic lens by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light rays modulated by the phase modulation module are converged by the corresponding microfluidic lens and then are reconstructed to the same area of a reconstruction plane for holographic display;
the microfluidic lens includes: the first electrode, the conductive liquid drop, the waterproof layer, the hydrophobic layer and the second electrode are sequentially arranged on one side, close to the second substrate, of the phase modulation module;
a third substrate is arranged between the first electrode and the conductive liquid drops, an isolation column is arranged between the conductive liquid drops of the adjacent micro-fluid lenses, and a closed space for accommodating the conductive liquid drops is surrounded by the water-resisting layer, the isolation column and the third substrate;
the phase modulation module includes: the third electrode, the first alignment layer, the liquid crystal layer, the second alignment layer and the fourth electrode are sequentially arranged on one side, close to the second substrate, of the pixel unit;
the fourth electrode of the phase modulation module and the first electrode of the micro-fluid lens are the same electrode.
2. The holographic display of claim 1, further comprising: a processing module connected to the microfluidic lens;
the processing module is used for applying voltage to the first electrode and the second electrode of the microfluidic lens and changing the height, the contact angle and the curvature radius of the conductive liquid drop so as to adjust the focal length of the microfluidic lens.
3. The holographic display of claim 2, further comprising: a pixel array layer disposed between the first substrate and the pixel unit;
and the third electrode of the phase modulation mold is a common electrode of a Thin Film Transistor (TFT) in the pixel array layer.
4. The holographic display of claim 3, in which the processing module is further connected with the TFTs in the pixel array layer and the phase modulation module;
the processing module is further configured to send color information and luminance information of the holographic image to be displayed to the TFT in the pixel array layer, so that the TFT controls the corresponding pixel unit to emit light;
the processing module is further configured to send phase information of a holographic image to be displayed to the phase modulation module, so that the phase modulation module performs phase modulation on the arriving light according to the phase information, and the phase-modulated light is subjected to holographic display after passing through a corresponding microfluidic lens.
5. A driving method of a holographic display, characterized in that the driving method is performed by the holographic display of any of claims 1 to 4, the driving method comprising:
carrying out phase modulation on light rays emitted by the pixel unit and reaching the phase modulation module to form a holographic image;
the focal length of the microfluidic lens is adjusted by controlling the shape of the conductive liquid drops in the microfluidic lens, so that the light modulated by the phase modulation module passes through the corresponding microfluidic lens and then is subjected to holographic display.
6. The method of driving the holographic display of claim 5, wherein the microfluidic lens includes a first electrode, the conductive droplet, and a second electrode, and the adjusting the focal length of the microfluidic lens comprises:
applying a voltage to the first electrode and the second electrode of the microfluidic lens to change the height, contact angle, and radius of curvature of the conductive droplet to adjust the focal length of the microfluidic lens.
7. The method for driving the holographic display of claim 5, wherein the holographic display further includes a pixel array layer, the method further comprising:
sending color information and brightness information of a holographic image to be displayed to a Thin Film Transistor (TFT) in the pixel array layer, so that the TFT controls a corresponding pixel unit to emit light;
and sending the phase information of the holographic image to be displayed to the phase modulation module, so that the phase modulation module performs phase modulation on the arriving light according to the phase information, and the phase-modulated light is subjected to holographic display after passing through the corresponding microfluidic lens.
8. A computer-readable storage medium storing executable instructions for implementing the method of driving a holographic display of any of claims 5 to 7 when executed by a processor.
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