CN115394258A - Auxiliary stereoscopic display system based on multi-zone synchronous control technology - Google Patents

Auxiliary stereoscopic display system based on multi-zone synchronous control technology Download PDF

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Publication number
CN115394258A
CN115394258A CN202111310538.9A CN202111310538A CN115394258A CN 115394258 A CN115394258 A CN 115394258A CN 202111310538 A CN202111310538 A CN 202111310538A CN 115394258 A CN115394258 A CN 115394258A
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CN
China
Prior art keywords
liquid crystal
display
region
light valve
area
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Pending
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CN202111310538.9A
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Chinese (zh)
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王元庆
金慧萍
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Nanjing University
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Nanjing University
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Priority to CN202111310538.9A priority Critical patent/CN115394258A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Abstract

The invention provides an auxiliary type three-dimensional display system based on a multi-zone synchronous control technology, relates to the technical field of 3D display, and is used for solving the problem of crosstalk increase of auxiliary type three-dimensional display equipment due to asynchronous left and right image time sequences. An auxiliary stereoscopic display system based on a multi-region synchronous control technology is used for a multi-region backlight 3D display device and comprises a multi-region backlight module, a liquid crystal display panel, a liquid crystal light valve, a region synchronous control module and polarized glasses. The light emitted from the liquid crystal light valve after the uniform backlight emitted by the multi-region backlight module is deflected by the three-layer structure is alternately switched between 45 degrees and 135 degrees and is respectively projected to the left eye and the right eye of a viewer to form a pair of stereoscopic image pairs. The display system reduces crosstalk of the auxiliary stereoscopic display equipment, does not need to use active switch glasses in the traditional auxiliary stereoscopic display equipment, and improves convenience and user experience of the auxiliary stereoscopic display equipment.

Description

Auxiliary stereoscopic display system based on multi-zone synchronous control technology
Technical Field
The application relates to the technical field of 3D display, in particular to an auxiliary stereoscopic display system based on a multi-region synchronous control technology.
Background
Currently, 2D liquid crystal displays are still the mainstream product of the display market. But the viewer's perception of depth information is ignored in this display mode. 3D stereoscopic display capable of providing depth information, which is closer to a three-dimensional space where humans live, is a popular content currently about display research. 3D stereoscopic displays have been recently introduced in the medical, educational and entertainment, video and other industries but have not been put into large-scale commercial use. Human beings can perceive stereo because two images seen by the left and right eyes of the human beings have a certain parallax, which is the physiological basis of 3D stereoscopic display. The current development of 3D stereoscopic display is mainly directed to two major categories, naked eye stereoscopic display and auxiliary stereoscopic display.
Autostereoscopic displays are typically based on parallax barriers or lenticular gratings. The parallax barrier or lenticular sheet may project a left image to the left eye of the viewer and a right image to the right eye of the viewer, where the left and right images are a pair of stereoscopic images having parallax, thus enabling 3D perception by the human eye. However, autostereoscopic displays based on parallax barriers or lenticular sheets typically suffer from a significant reduction in screen brightness and image resolution due to occlusion of the barrier or blurring of image focus and spatial separation of the images. Furthermore, since the viewpoint is fixed, the viewer can only stand at a fixed orientation and distance from the display to view the stereoscopic effect, and viewing limitations are large.
Patent application No. CN201610382323.0 provides a slit grating for a naked eye stereoscopic display device and a naked eye stereoscopic display device. The slit grating comprises a substrate and a plurality of shading strips arranged on the substrate at intervals, the shading strips are used for shading incident light, the slit grating further comprises a wire grid located in a light-transmitting area between the shading strips, the wire grid is used for transmitting a first polarization component of the incident light and reflecting a second polarization component, perpendicular to the first polarization component, of the incident light, and the slit grating is arranged between the backlight module and the liquid crystal panel. The invention improves the brightness of naked eye stereoscopic display.
Auxiliary stereoscopic displays are typically implemented with actively switched glasses, which are relied upon to separate left and right stereoscopic image pairs. The active switching glasses are composed of two liquid crystal optical switches, and the switching signals are used for obtaining independent views of the left eye and the right eye by alternately setting the states of the left lens and the right lens (whether images can be passed or not). At the same time, only one eye can receive the image, and when the frequency of the switching signal is high enough and the left image and the right image are switched fast enough, the images seen by the human eyes are three-dimensional and continuous. Compared with naked eye stereoscopic display, the display mode has the advantages that the screen brightness and the image resolution are improved, but a viewer needs to wear special auxiliary equipment, the display mode is slightly cumbersome, and the user experience is poor. In addition, in the using process, the flicker problem generally exists, and the symptoms such as visual fatigue, dizziness and the like are easily caused. On the other hand, the auxiliary stereoscopic display has a high timing requirement for right and left images, and crosstalk is likely to occur.
As in patent application No. CN201180032120.4, a backlight unit for auxiliary stereoscopic display by means of switch glasses is provided. In a first time interval in which the backlight is off, the entire group of pixels is output to the display panel of the display system, and in a second time interval in which the entire group of pixels has been output to the display panel of the display system, the backlight unit is turned on to illuminate the display panel. In this scheme, the turning on and off of the backlight is after the frame is fully displayed and before all pixels are refreshed, rather than dynamically setting the turning on and off of the backlight during the pixel refresh.
Traditional display backlight is in the normal bright state all the time, and some research adopts dynamic dimming technique, according to the content that shows the image, adjusts backlight LED's luminance in real time, and in the place that the image is darker, the luminance of suitable dim LED, in the place that the pattern is brighter, the luminance of suitable bright LED of adjusting. The dynamic dimming technology based on the pixel gray-scale value can easily realize a display device with low power consumption and high contrast, but still does not solve the problem of crosstalk caused by asynchronous left and right image pairs in auxiliary stereoscopic display.
Patent application No. CN201120152193.4 provides a dynamic dimming device for an LED backlight. After the image signal is processed by the control circuit, the control signal is output to enable the current or the voltage on the LED in the LED backlight system to change timely, so that the brightness of the LED is changed, and the aim of dynamic backlight adjustment is fulfilled.
Therefore, the prior art has the following disadvantages:
(1) The naked eye stereoscopic display has low brightness and image resolution due to blocking of a barrier or blurring of an image focus and spatial separation of images, and has a large restriction on a viewing position of a viewer.
(2) The synchronous problem of active switch glasses. The glasses need to be switched on and off left and right when the display displays left images, and the glasses need to be switched on and off left and right when the display displays right images. The timing requirements are very strict and crosstalk is easily generated. Some active switch glasses and displays on the current market are synchronized in an infrared mode, and an infrared receiving device needs to be equipped on the glasses. In addition, the power supply of the actively switched glasses is also a problem, which has a certain limit to the viewing time of the viewer.
Disclosure of Invention
The technical problem that this application actually solved is to reduce the crosstalk that produces because of the left and right image desynchronization in the auxiliary type stereoscopic display equipment. In order to solve the above problems, the present application provides an auxiliary stereoscopic display system based on a multi-region synchronous control technology.
The embodiment of the application provides an auxiliary type stereoscopic display system based on multizone synchronous control technique, includes:
the display system consists of a multi-region backlight module, a liquid crystal display panel, a liquid crystal light valve, a region synchronous control module and polarized glasses; the multi-region backlight module and the liquid crystal light valve are respectively provided with a unique region synchronous control module, the region synchronous control module of the multi-region backlight module is used for controlling the refreshing time sequence of the multi-region backlight, and the region synchronous control module of the liquid crystal light valve is used for controlling the polarization state of the liquid crystal light valve; the multi-region backlight module, the liquid crystal display panel and the liquid crystal light valve need to keep state synchronization among the three by means of frame synchronization signals, and the time sequence of left and right eyes is strictly restricted; the multi-region backlight module and the liquid crystal light valve are divided into N multiplied by M block regions according to the pixel refreshing rule of the liquid crystal display panel, the N multiplied by M block display regions of the liquid crystal display panel, the N multiplied by M block lighting regions of the multi-region backlight module and the N multiplied by M block switch regions of the liquid crystal light valve are in one-to-one correspondence, and the lighting regions and the switch regions change the state of the regions under the control of the region synchronous control module so as to reduce image crosstalk.
Light that multizone backlight unit sent sees through the polarizing film of liquid crystal display panel lower surface, take place one deck deflection, liquid crystal display panel's voltage can control the degree of deflection of light, take place second floor deflection, the light after liquid crystal display panel deflects can take place the third layer deflection through the polarizing film of liquid crystal display panel upper surface, the polarization direction of the outgoing light that the polarizing film passes through the liquid crystal light valve can be controlled to the liquid crystal light valve, the light of two kinds of polarization angles can get into viewer's left eye and right eye respectively through polarization glasses, form a three-dimensional image pair that has the parallax, produce three-dimensional view.
The liquid crystal light valve comprises: the N multiplied by M block optical switch area is used for controlling the polarization direction of light rays passing through the liquid crystal light valve, when control voltages are respectively high level and low level, the polarization direction of emergent light rays passing through the liquid crystal light valve is respectively 45 degrees and 135 degrees, the N multiplied by M block optical switch area is provided with an independent control circuit, the driving voltage can be independently set to be high level or low level, and therefore the polarization direction of emergent light rays of a certain switch area can be arbitrarily set to be 45 degrees or 135 degrees.
The region synchronization control module comprises: the control module of the liquid crystal light valve controls the switch area of the liquid crystal light valve corresponding to the display area to change the polarization state at a specific time according to the display sequence of the liquid crystal display panel, and the time sequence of the change of the states of the illumination area and the switch area is determined by the synchronous relationship among the multi-area backlight module, the liquid crystal display panel and the liquid crystal light valve.
Multizone backlight module, liquid crystal display panel, liquid crystal light valve need rely on frame synchronizing signal to keep the state synchronization between the three, include: when the frame synchronization signal arrives, the display starts to display a new frame of image, and the refreshing time of each frame of image is fixed; after receiving the frame synchronization signal, the display starts to refresh the first display area after the display waiting time, when all pixels of the first display area are refreshed, that is, after the first display area is displayed, the first backlight area is opened, the polarization state of the first liquid crystal light valve switch area is changed, the backlight module and the liquid crystal light valve module need to finish the synchronization with the display area by the frame synchronization signal, the frame period of the liquid crystal display panel displaying the image is T, the display returning time is delta T, and then, compared with the previous illumination area or switch area, each illumination area or switch area has the time delay of (T-delta T)/(N x M) state change.
Drawings
FIG. 1 is a schematic diagram of a structure of an auxiliary stereoscopic display system based on a multi-domain synchronous control technique;
FIG. 2 is a flow chart of an auxiliary stereoscopic display system based on multi-zone synchronous control technology for determining the status of a switch zone and the status of an illumination zone according to the status of a display zone;
fig. 3 is a block diagram of a circuit structure of an auxiliary stereoscopic display system based on a multi-region synchronization control technique.
Fig. 4 is a circuit configuration diagram for determining a state of a switching area and a state of an illumination area according to a state of a display area.
FIG. 5 is a schematic diagram of a control pin of the liquid crystal light valve.
Fig. 6 is a waveform diagram of the multi-domain backlight control signal and the liquid crystal light valve control signal outputted by the domain synchronization control module.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
The embodiment provides an auxiliary stereoscopic display system based on a multi-region synchronous control technology. As shown in fig. 3, the video source sends the stereoscopic video data to the liquid crystal display panel, and the area controller determines the states of different display areas and switch areas according to a display signal indicating whether the liquid crystal display panel has completed displaying. The display area is divided into N × M blocks according to the pixel refresh rule of one frame of image, and similarly, the illumination area and the switch area are correspondingly divided into N × M blocks.
The following describes the working process of an auxiliary stereoscopic display system based on multi-domain synchronous control technology when a liquid crystal display panel displays an image.
As shown in fig. 1, the innermost of the display system is a multi-region backlight module, which is composed of nxm independent white LED light bars, and a polarizing film is attached thereon, wherein uniform backlight emitted from the multi-region backlight module is deflected by a first layer through the polarizing film, and the emergent light is linearly polarized light in a specific direction. The liquid crystal molecules in the liquid crystal display panel can deflect to different degrees according to the change of the driving voltage, so that the second layer of the backlight deflects, and the direction of emergent light rays is irregular due to the irregular arrangement of the liquid crystal molecules. The upper surface of the liquid crystal display panel is also attached with a polarizing film, light deflected by the liquid crystal display panel can be subjected to third-layer deflection through the polarizing film on the upper surface of the liquid crystal display panel, thus, incident light of the liquid crystal light valve is polarized light in a certain specific direction, the passing state of the liquid crystal light valve is switched, one switch area can only pass the polarized light in one direction in a specific time period, in the embodiment, emergent light passing through the liquid crystal light valve is alternately switched between 45 degrees and 135 degrees, and the switching state depends on the control signal of the liquid crystal light valve.
As shown in fig. 2, i and j are both assigned 1 to indicate that the image of a new frame is being refreshed on the lcd panel. And at the moment, the first display area starts to display, the area synchronous control module judges the state of the area, and if all pixels of the display area are refreshed, namely the display area finishes displaying, the corresponding illumination area is opened, and the state of the switch area is switched. The light in the illumination area passes through the optical module, the display area starts to display the image, and the state of the switch area is changed to project the image to the other eye of the viewer. And then, updating the values of i and j, starting to display the content of the second display area by the liquid crystal display panel, and when all the pixels of the second display area are refreshed, enabling the action of the illumination area and the switch area corresponding to the second display area to be the same as the action of the illumination area and the switch area corresponding to the last display area when the last display area is completely displayed, and so on, and starting to display the image of the next frame until all the pixels on the whole liquid crystal display panel are refreshed.
Fig. 5 is a schematic diagram of the pins of the liquid crystal light valve. The left side and the right side of the liquid crystal light valve are respectively provided with a flexible belt, and each flexible belt is provided with a plurality of pins. The pins on each side are divided into respective nxm groups, namely Seg11, seg12. The N M groups of pins respectively control N M block switch areas of the liquid crystal light valve. The control pin of each set Seg needs to be connected with a voltage of +/-24V, and positive and negative voltages are used for preventing polarization of liquid crystal.
The wiring of the liquid crystal light valve will be described by taking the driving Seg11 as an example. Finding a plurality of pins respectively corresponding to the Seg11 on the two flexible belts, and connecting a driving voltage of +/-24V. The driving signal is connected to the flexible tape through an FPC adapter board, and thus, the driving of the SEG11 is completed. The driving of the liquid crystal light valve requires the use of a voltage of ± 24V. The present embodiment realizes the ± 24V voltage output circuit by a high-speed electronic switch. A power supply module generates +24V and-24V voltage outputs, and a high-speed electronic switch outputs the +24V and-24V voltages in a time-sharing manner to realize positive and negative voltage outputs. In this embodiment, the high-speed electronic switch is composed of two relays, the outputs of the two relays are respectively 0V or +24v,0v or-24V, and the ± 24V control voltage can be formed by selecting different relay outputs in a time-sharing manner. In the embodiment, GPIO output of the stm32 single chip microcomputer is used as a control signal of the relay, so that control of the duty ratio, the period and the like of +/-24V voltage is realized. The purpose of controlling the synchronous change of the states of the switch area, the lighting area and the display area can be achieved by setting the control voltage time sequence of the N multiplied by M segs.
The present embodiment employs a 120Hz fast response liquid crystal display panel. According to the time-sharing principle, the refresh rate of the left eye and the refresh rate of the right eye are both 60Hz, and video data can be smoothly played. The display back time delta t of the liquid crystal display panel is measured, the display time of one frame of image is subtracted by the display back time delta t to obtain the refreshing time of the image on the liquid crystal display panel, and the ratio of the image refreshing time (8.33 ms-delta t) to the N multiplied by M is the refreshing time of each display area. Then, the time delay of the state change of the k +1 th switching region or illumination region compared with the k th switching region or illumination region is the refresh time of each display region.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the inventive concepts herein.

Claims (3)

1. An auxiliary stereoscopic display system based on a multi-region synchronous control technology is characterized in that the display system consists of a multi-region backlight module, a liquid crystal display panel, a liquid crystal light valve, a region synchronous control module and polarized glasses; the multi-region backlight module and the liquid crystal light valve are provided with unique region synchronous control modules, the region synchronous control module of the multi-region backlight module is used for controlling the refreshing time sequence of the multi-region backlight, and the region synchronous control module of the liquid crystal light valve is used for controlling the polarization state of the liquid crystal light valve; the multi-region backlight module, the liquid crystal display panel and the liquid crystal light valve need to keep state synchronization among the three by means of frame synchronization signals, and the time sequence of left and right eyes is strictly restricted; the multi-region backlight module and the liquid crystal light valve are divided into N multiplied by M block regions according to the pixel refreshing rule of the liquid crystal display panel, the N multiplied by M block display regions of the liquid crystal display panel, the N multiplied by M block lighting regions of the multi-region backlight module and the N multiplied by M block switch regions of the liquid crystal light valve are in one-to-one correspondence, and the lighting regions and the switch regions change the state of the regions under the control of the region synchronous control module so as to reduce image crosstalk.
2. The auxiliary stereoscopic display system based on the multi-region synchronous control technology as claimed in claim 1, wherein the region synchronous control module comprises: the control module of the liquid crystal light valve controls the switch area of the liquid crystal light valve corresponding to the display area to change the polarization state at a specific time according to the display sequence of the liquid crystal display panel, and the time sequence of the change of the states of the illumination area and the switch area is determined by the synchronous relationship among the multi-area backlight module, the liquid crystal display panel and the liquid crystal light valve.
3. The auxiliary stereoscopic display system according to claim 1, wherein the multi-domain backlight module, the lcd panel and the lcd light valve need to maintain the state synchronization among the three by means of the frame synchronization signal, comprising: when the frame synchronization signal arrives, the display starts to display a new frame of image, and the refreshing time of each frame of image is fixed; after receiving the frame synchronization signal, the display starts to refresh the first display area after the time of display back, when all pixels in the first display area are completely refreshed, that is, after the first display area is completely displayed, the first backlight area is opened, the polarization state of the first liquid crystal light valve switch area is changed, the backlight module and the liquid crystal light valve module need to finish the synchronization with the display area by the frame synchronization signal, the frame period of the liquid crystal display panel for displaying images is T, the time of display back is Deltat, and then each illumination area or switch area is compared with the previous illumination area or switch area, and the time delay of the state change is (T-Deltat)/(N × M).
CN202111310538.9A 2021-11-05 2021-11-05 Auxiliary stereoscopic display system based on multi-zone synchronous control technology Pending CN115394258A (en)

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Application Number Priority Date Filing Date Title
CN202111310538.9A CN115394258A (en) 2021-11-05 2021-11-05 Auxiliary stereoscopic display system based on multi-zone synchronous control technology

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Application Number Priority Date Filing Date Title
CN202111310538.9A CN115394258A (en) 2021-11-05 2021-11-05 Auxiliary stereoscopic display system based on multi-zone synchronous control technology

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Publication Number Publication Date
CN115394258A true CN115394258A (en) 2022-11-25

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