CN109192152A - A kind of LCD control circuit and terminal - Google Patents
A kind of LCD control circuit and terminal Download PDFInfo
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- CN109192152A CN109192152A CN201810995822.6A CN201810995822A CN109192152A CN 109192152 A CN109192152 A CN 109192152A CN 201810995822 A CN201810995822 A CN 201810995822A CN 109192152 A CN109192152 A CN 109192152A
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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
- G09G3/36—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 using liquid crystals
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A kind of LCD control circuit, including logic judging circuit, high level holding circuit, LCD panel, oscillating circuit and execution circuit；The logic judging circuit includes first input end, the second input terminal and output end；The output end of the high level holding circuit is connect with the first input end of the logic judging circuit；The output end of the LCD panel is connect with the input terminal of the high level holding circuit；The output end of the oscillating circuit is connect with the second input terminal of the logic judging circuit；The input terminal of the execution circuit is connect with the output end of the logic judging circuit, and the output end of the execution circuit is connect with the input terminal of the LCD panel.In addition, the embodiment of the invention also provides a kind of terminals.
Description
Technical field
The present invention relates to liquid crystal display (LCD) control field more particularly to a kind of LCD control circuits and terminal.
Background technique
At present on the market there are mainly two types of liquid crystal display (Liquid Crystal Display, LCD) types, Yi Zhongwei
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) LCD, one kind are thin film transistor (TFT) (Thin
Film Transistor, TFT) LCD.OLED LCD is self-luminous LCD, does not need additional backlight, and TFT LCD is then needed
Want additional backlight.In TFT LCD display technology, in order to reduce backlight leds (Light Emitting
Diode, LED) power consumption, introduce content-adaptive backlight control techniques (Content Adaptive Backlight Control,
CABC), i.e., adjusting backlight luminance is come according to the content of image.In existing TFT LCD displaying scheme, when user is using
When leading to LCD blank screen because of Electro-static Driven Comb (Electro-Static discharge, ESD) problem in the process, such case
It needs artificially to press power button twice and restores normal display, or if Integrated Simulation ESD restores function, every 5s detection is primary
The state of LCD, data pass through LCD mobile industry processor interface (Mobile Industry Processor
Interface, MIPI) transmission, need this normally opened function of software that can just come into force, but this normally opened function can occupy LCD MIPI money
Phenomena such as source causes LCD to show Caton.
Summary of the invention
It is a primary object of the present invention to propose a kind of to be restarted automatically the low LCD control circuit of LCD, system power dissipation, it is intended to
It solves the problems, such as existing.
To achieve the above object, the invention proposes a kind of LCD control circuits, comprising: logic judging circuit, high level are protected
Hold circuit, LCD panel, oscillating circuit and execution circuit；The logic judging circuit include first input end, the second input terminal and
Output end；The output end of the high level holding circuit is connect with the first input end of the logic judging circuit；The face LCD
The output end of plate is connect with the input terminal of the high level holding circuit；The output end of the oscillating circuit and the logic judgment
Second input terminal of circuit connects；The input terminal of the execution circuit is connect with the output end of the logic judging circuit, described
The output end of execution circuit is connect with the input terminal of the LCD panel.
In above scheme, the LCD control circuit further include positioned at the high level holding circuit input terminal with it is described
Rectifier diode between the output end of LCD panel；The anode of the rectifier diode connects with the output end of the LCD panel
It connects；The cathode of the rectifier diode is connect with the input terminal of the high level holding circuit.
In above scheme, the high level holding circuit includes voltage holding capacitor, one end of the voltage holding capacitor
It is connect with the output end of the LCD panel, the other end is connected to ground.
In above scheme, the high level holding circuit further includes discharge resistance, and the discharge resistance and the voltage are protected
Hold capacitor parallel connection.
In above scheme, the execution circuit includes processor, the first input/output port of the processor with it is described
The input terminal of logic judging circuit connects, and the second input/output port of the processor and the input terminal of the LCD panel connect
It connects.
In above scheme, the execution circuit includes Power Management Unit, the input terminal of the Power Management Unit and institute
The output end connection of logic judging circuit is stated, the output end of the Power Management Unit is connect with the input terminal of the LCD panel.
In above scheme, the execution circuit includes Power Management Unit and processor；The Power Management Unit it is defeated
Enter end to connect with the output end of the logic judging circuit, the first of the output end of the Power Management Unit and the processor
Input/output port connection, the second input/output interface of the processor are connect with the input terminal of the LCD panel.
In above scheme, the oscillating circuit includes power-management interface unit, the power-management interface unit it is defeated
Outlet is connect with the second input terminal of the logic judging circuit.
In above scheme, the logic judging circuit is or door.
In addition, to achieve the above object, the invention proposes a kind of terminal, including LCD control circuit, the LCD control
Circuit includes: logic judging circuit, high level holding circuit, LCD panel, oscillating circuit and execution circuit；The logic judgment
Circuit includes first input end, the second input terminal and output end；The output end of the high level holding circuit is sentenced with the logic
The first input end of deenergizing connects；The output end of the LCD panel is connect with the input terminal of the high level holding circuit；Institute
The output end for stating oscillating circuit is connect with the second input terminal of the logic judging circuit；The input terminal of the execution circuit and institute
The output end connection of logic judging circuit is stated, the output end of the execution circuit is connect with the input terminal of the LCD panel.
In above scheme, the LCD control circuit further include positioned at the high level holding circuit input terminal with it is described
Rectifier diode between the output end of LCD panel；The anode of the rectifier diode connects with the output end of the LCD panel
It connects；The cathode of the rectifier diode is connect with the input terminal of the high level holding circuit.
In above scheme, the high level holding circuit includes voltage holding capacitor, one end of the voltage holding capacitor
It is connect with the output end of the LCD panel, the other end is connected to ground.
In above scheme, the high level holding circuit further includes discharge resistance, and the discharge resistance and the voltage are protected
Hold capacitor parallel connection.
In above scheme, the execution circuit includes processor, the first input/output port of the processor with it is described
The input terminal of logic judging circuit connects, and the second input/output port of the processor and the input terminal of the LCD panel connect
It connects.
In above scheme, the execution circuit includes Power Management Unit, the input terminal of the Power Management Unit and institute
The output end connection of logic judging circuit is stated, the output end of the Power Management Unit is connect with the input terminal of the LCD panel.
In above scheme, the execution circuit includes Power Management Unit and processor；The Power Management Unit it is defeated
Enter end to connect with the output end of the logic judging circuit, the first of the output end of the Power Management Unit and the processor
Input/output port connection, the second input/output interface of the processor are connect with the input terminal of the LCD panel.
In above scheme, the oscillating circuit includes power-management interface unit, the power-management interface unit it is defeated
Outlet is connect with the second input terminal of the logic judging circuit.
In above scheme, the logic judging circuit is or door.
Therefore, compared to the prior art, the embodiment of the invention provides a kind of LCD control circuits, terminal, comprising: logic
Decision circuitry, high level holding circuit, LCD panel, oscillating circuit and execution circuit；The logic judging circuit includes first defeated
Enter end and the second input terminal；The output end of the high level holding circuit and the first input end of the logic judging circuit connect
It connects；The output end of the LCD panel is connect with the input terminal of the high level holding circuit；The output end of the oscillating circuit with
Second input terminal of the logic judging circuit connects；The output of the input terminal of the execution circuit and the logic judging circuit
End connection, the output end of the execution circuit connect with the input terminal of the LCD panel, in this way, by by the level of LCD panel
Signal carries out high level holding, and carries out logic judgment jointly with the signal of oscillating circuit, is realized according to logic judgment result
LCD's is restarted automatically, and has saved system resource, ensure that LCD performance, reduces system power dissipation, the user experience is improved.
Detailed description of the invention
Fig. 1 optionally hardware configuration signal of the terminal comprising LCD control circuit in each embodiment to realize the present invention
Figure；
Fig. 2 is the wireless communication system schematic diagram of the terminal comprising LCD control circuit as shown in Figure 1；
Fig. 3 is the circuit diagram of LCD control circuit in an alternate embodiment of the present invention；
Fig. 4 is the circuit diagram of LCD control circuit in an alternate embodiment of the present invention；
Fig. 5 is the circuit diagram of LCD control circuit in an alternate embodiment of the present invention；
Fig. 6 is the circuit diagram of LCD control circuit in an alternate embodiment of the present invention；
Fig. 7 is the physical circuit figure of LCD control circuit in an alternate embodiment of the present invention.
Appended drawing reference:
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix
Ground uses.
Terminal can be implemented in a variety of manners.For example, terminal described in the present invention may include such as mobile phone, plate
Computer, laptop, palm PC, personal digital assistant (Personal Digital Assistant, PDA), portable
Media player (Portable Media Player, PMP), navigation device, wearable device, Intelligent bracelet, pedometer etc. move
The fixed terminals such as dynamic terminal, and number TV, desktop computer.
It will be illustrated by taking mobile terminal as an example in subsequent descriptions, it will be appreciated by those skilled in the art that in addition to special
Except element for moving purpose, the construction of embodiment according to the present invention can also apply to the terminal of fixed type.
Referring to Fig. 1, a kind of hardware structural diagram of its mobile terminal of each embodiment to realize the present invention, the shifting
Dynamic terminal 100 may include: RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit
103, A/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit
108, the components such as memory 109, processor 110 and power supply 111.It will be understood by those skilled in the art that shown in Fig. 1
Mobile terminal structure does not constitute the restriction to mobile terminal, and mobile terminal may include components more more or fewer than diagram,
Perhaps certain components or different component layouts are combined.
It is specifically introduced below with reference to all parts of the Fig. 1 to mobile terminal:
Radio frequency unit 101 can be used for receiving and sending messages or communication process in, signal sends and receivees, specifically, by base station
Downlink information receive after, to processor 110 handle；In addition, the data of uplink are sent to base station.In general, radio frequency unit 101
Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrating
Frequency unit 101 can also be communicated with network and other equipment by wireless communication.Any communication can be used in above-mentioned wireless communication
Standard or agreement, including but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications
System), GPRS (General Packet Radio Service, general packet radio service), CDMA2000 (Code
Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code Division
Multiple Access, wideband code division multiple access), TD-SCDMA (Time Division-Synchronous Code
Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division
Duplexing-Long Term Evolution, frequency division duplex long term evolution) and TDD-LTE (Time Division
Duplexing-Long Term Evolution, time division duplex long term evolution) etc..
WiFi belongs to short range wireless transmission technology, and mobile terminal can help user to receive and dispatch electricity by WiFi module 102
Sub- mail, browsing webpage and access streaming video etc., it provides wireless broadband internet access for user.Although Fig. 1 shows
Go out WiFi module 102, but it is understood that, and it is not belonging to must be configured into for mobile terminal, it completely can be according to need
It to omit within the scope of not changing the essence of the invention.
Audio output unit 103 can be in call signal reception pattern, call mode, record mould in mobile terminal 100
When under the isotypes such as formula, speech recognition mode, broadcast reception mode, by radio frequency unit 101 or WiFi module 102 it is received or
The audio data stored in memory 109 is converted into audio signal and exports to be sound.Moreover, audio output unit 103
Audio output relevant to the specific function that mobile terminal 100 executes can also be provided (for example, call signal receives sound, disappears
Breath receives sound etc.).Audio output unit 103 may include loudspeaker, buzzer etc..
A/V input unit 104 is for receiving audio or video signal.A/V input unit 104 may include graphics processor
(Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 is in video acquisition mode
Or the image data of the static images or video obtained in image capture mode by image capture apparatus (such as camera) carries out
Reason.Treated, and picture frame may be displayed on display unit 106.Through graphics processor 1041, treated that picture frame can be deposited
Storage is sent in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike
Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042
Quiet down sound (audio data), and can be audio data by such acoustic processing.Audio that treated (voice) data can
To be converted to the format output that can be sent to mobile communication base station via radio frequency unit 101 in the case where telephone calling model.
Microphone 1042 can be implemented various types of noises elimination (or inhibition) algorithms and send and receive sound to eliminate (or inhibition)
The noise generated during frequency signal or interference.
Mobile terminal 100 further includes at least one sensor 105, such as optical sensor, motion sensor and other biographies
Sensor.Specifically, optical sensor includes ambient light sensor and proximity sensor, wherein ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 1061, and proximity sensor can close when mobile terminal 100 is moved in one's ear
Display panel 1061 and/or backlight.As a kind of motion sensor, accelerometer sensor can detect in all directions (general
For three axis) size of acceleration, it can detect that size and the direction of gravity when static, can be used to identify the application of mobile phone posture
(such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) etc.；
The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer,
The other sensors such as hygrometer, thermometer, infrared sensor, details are not described herein.
Display unit 106 is for showing information input by user or being supplied to the information of user.Display unit 106 can wrap
Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used
Forms such as (Organic Light-Emitting Diode, OLED) configure display panel 1061.
User input unit 107 can be used for receiving the number or character information of input, and generate the use with mobile terminal
Family setting and the related key signals input of function control.Specifically, user input unit 107 may include touch panel 1071 with
And other input equipments 1072.Touch panel 1071, also referred to as touch screen collect the touch operation of user on it or nearby
(for example user uses any suitable objects or attachment such as finger, stylus on touch panel 1071 or in touch panel 1071
Neighbouring operation), and corresponding attachment device is driven according to preset formula.Touch panel 1071 may include touch detection
Two parts of device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation band
The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it
It is converted into contact coordinate, then gives processor 110, and order that processor 110 is sent can be received and executed.In addition, can
To realize touch panel 1071 using multiple types such as resistance-type, condenser type, infrared ray and surface acoustic waves.In addition to touch panel
1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can wrap
It includes but is not limited in physical keyboard, function key (such as volume control button, switch key etc.), trace ball, mouse, operating stick etc.
It is one or more, specifically herein without limitation.
Further, touch panel 1071 can cover display panel 1061, when touch panel 1071 detect on it or
After neighbouring touch operation, processor 110 is sent to determine the type of touch event, is followed by subsequent processing device 110 according to touch thing
The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, touch panel 1071 and display panel
1061 be the function that outputs and inputs of realizing mobile terminal as two independent components, but in certain embodiments, it can
The function that outputs and inputs of mobile terminal is realized so that touch panel 1071 and display panel 1061 is integrated, is not done herein specifically
It limits.
Interface unit 108 be used as at least one external device (ED) connect with mobile terminal 100 can by interface.For example,
External device (ED) may include wired or wireless headphone port, external power supply (or battery charger) port, wired or nothing
Line data port, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end
Mouth, video i/o port, ear port etc..Interface unit 108 can be used for receiving the input from external device (ED) (for example, number
It is believed that breath, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 100 or can be with
For transmitting data between mobile terminal 100 and external device (ED).
Memory 109 can be used for storing software program and various data.Memory 109 can mainly include storing program area
The storage data area and, wherein storing program area can (such as the sound of application program needed for storage program area, at least one function
Sound playing function, image player function etc.) etc.；Storage data area can store according to mobile phone use created data (such as
Audio data, phone directory etc.) etc..In addition, memory 109 may include high-speed random access memory, it can also include non-easy
The property lost memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.
Processor 110 is the control centre of mobile terminal, utilizes each of various interfaces and the entire mobile terminal of connection
A part by running or execute the software program and/or module that are stored in memory 109, and calls and is stored in storage
Data in device 109 execute the various functions and processing data of mobile terminal, to carry out integral monitoring to mobile terminal.Place
Managing device 110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modulatedemodulate is mediated
Manage device, wherein the main processing operation system of application processor, user interface and application program etc., modem processor is main
Processing wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.
Mobile terminal 100 can also include the power supply 111 (such as battery) powered to all parts, it is preferred that power supply 111
Can be logically contiguous by power-supply management system and processor 110, to realize management charging by power-supply management system, put
The functions such as electricity and power managed.
Although Fig. 1 is not shown, mobile terminal 100 can also be including bluetooth module etc., and details are not described herein.
Embodiment to facilitate the understanding of the present invention, the communications network system that mobile terminal of the invention is based below into
Row description.
Referring to Fig. 2, Fig. 2 is a kind of communications network system architecture diagram provided in an embodiment of the present invention, the communication network system
System is the LTE system of universal mobile communications technology, which includes UE (User Equipment, the use of successively communication connection
Family equipment) (the land Evolved UMTS Terrestrial Radio Access Network, evolved UMTS 201, E-UTRAN
Ground wireless access network) 202, EPC (Evolved Packet Core, evolved packet-based core networks) 203 and operator IP operation
204。
Specifically, UE201 can be above-mentioned terminal 100, and details are not described herein again.
E-UTRAN202 includes eNodeB2021 and other eNodeB2022 etc..Wherein, eNodeB2021 can be by returning
Journey (backhaul) (such as X2 interface) is connect with other eNodeB2022, and eNodeB2021 is connected to EPC203,
ENodeB2021 can provide the access of UE201 to EPC203.
EPC203 may include MME (Mobility Management Entity, mobility management entity) 2031, HSS
(Home Subscriber Server, home subscriber server) 2032, other MME2033, SGW (Serving Gate Way,
Gateway) 2034, PGW (PDN Gate Way, grouped data network gateway) 2035 and PCRF (Policy and
Charging Rules Function, policy and rate functional entity) 2036 etc..Wherein, MME2031 be processing UE201 and
The control node of signaling, provides carrying and connection management between EPC203.HSS2032 is all to manage for providing some registers
Such as the function of home location register (not shown) etc, and preserves some related service features, data rates etc. and use
The dedicated information in family.All customer data can be sent by SGW2034, and PGW2035 can provide the IP of UE 201
Address distribution and other functions, PCRF2036 are strategy and the charging control strategic decision-making of business data flow and IP bearing resource
Point, it selects and provides available strategy and charging control decision with charge execution function unit (not shown) for strategy.
IP operation 204 may include internet, Intranet, IMS (IP Multimedia Subsystem, IP multimedia
System) or other IP operations etc..
Although above-mentioned be described by taking LTE system as an example, those skilled in the art should know the present invention is not only
Suitable for LTE system, be readily applicable to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA with
And the following new network system etc., herein without limitation.
Based on above-mentioned mobile terminal hardware configuration and communications network system, each embodiment of the method for the present invention is proposed.
Referring to Fig. 3, the embodiment of the invention provides a kind of LCD control circuits, comprising: logic judging circuit 301, high electricity
Flat holding circuit 302, LCD panel 303, oscillating circuit 304 and execution circuit 305；The logic judging circuit 301 includes first
Input terminal, the second input terminal and output end；The output end of the high level holding circuit 302 and the logic judging circuit 301
First input end connection；The output end of the LCD panel 303 is connect with the input terminal of the high level holding circuit 302；Institute
The output end for stating oscillating circuit 304 is connect with the second input terminal of the logic judging circuit 301；The execution circuit 305
Input terminal is connect with the output end of the logic judging circuit 301, the output end of the execution circuit 305 and the LCD panel
303 input terminal connection.Specifically, the LCD panel 303 can be LCD, can also be the circuit including LCD, for receiving
The electric signal of external devices sends electric signal to external devices.The high level holding circuit 302 is used in specific time
The high level signal that the interior LCD panel 303 that will be received exports remains high level and is sent to logic judging circuit 301, here
Specific time can be 5ms, 10ms or 20ms etc., can be set accordingly according to the actual situation in practical applications
It is fixed.The oscillating circuit may include the sine wave oscillation circuit that output waveform is sine wave or cosine wave, also may include
Output waveform is the non-sinusoidal waveform oscillating circuit of square wave, rectangular wave or sawtooth wave.The oscillating circuit 304 may include quartz
Crystal oscillating circuit, LC oscillating circuit or RC oscillating circuit.Optionally, the output of the oscillating circuit is pulse width modulation
(Pulse Width Modulation, PWM) signal, frequency can be 10Hz, 50Hz or 100Hz, and the corresponding period can be with
It is that perhaps 10ms duty ratio can be 10%, 20% or 50% by 100ms, 20ms, it in practical applications can be according to practical feelings
The frequency of oscillating circuit, period and duty ratio is arranged in condition accordingly.The logic judging circuit may include or door or
NOT gate and door or NAND gate.According to or the first input end of door or door and the output end of high level holding circuit 302 connect
It connects or the second input terminal of door is connect with the output end of oscillating circuit 304 or the input of the output end of door and execution circuit 305
End connection；In the output high level of high level holding circuit 302,304 output pwm signal of oscillating circuit or the output end of door is defeated
High level signal out；Export low level in high level holding circuit 302, when 304 output pwm signal of oscillating circuit or door it is defeated
Outlet output pwm signal.According to nor gate, the first input end of nor gate and the output end of high level holding circuit 302 connect
It connects, the second input terminal of nor gate is connect with the output end of oscillating circuit 304, output end and the execution circuit 305 of nor gate
Input terminal connection；Export high level in high level holding circuit 302, when 304 output pwm signal of oscillating circuit, nor gate it is defeated
Outlet exports low level signal；In the output low level of high level holding circuit 302,304 output pwm signal of oscillating circuit, or
The output end output pwm signal of NOT gate.According to door, output with the first input end of door and high level holding circuit 302
End connection, connect with the second input terminal of door with the output end of oscillating circuit 304, output end and the execution circuit 305 with door
Input terminal connection；In the output high level of high level holding circuit 302,304 output pwm signal of oscillating circuit, the output with door
Hold output pwm signal；It is defeated with door in the output low level of high level holding circuit 302,304 output pwm signal of oscillating circuit
Outlet exports low level signal.According to NAND gate, the first input end of NAND gate and the output end of high level holding circuit 302
Connection, the second input terminal of NAND gate are connect with the output end of oscillating circuit 304, the output end and execution circuit 305 of NAND gate
Input terminal connection；In the output high level of high level holding circuit 302,304 output pwm signal of oscillating circuit, NAND gate
Output end output pwm signal；Low level is exported in high level holding circuit 302, it is and non-when 304 output pwm signal of oscillating circuit
The output end of door exports high level signal.The execution circuit 305 can export electric signal, control according to logic judging circuit 301
The connecting and disconnecting of the power supply of LCD panel 303 processed.In this way, by the way that the level signal of LCD panel 303 is carried out high level holding,
And logic judgment is carried out jointly with the signal of oscillating circuit 304, being restarted automatically for LCD is realized according to logic judgment result, is saved
About system resource, ensure that LCD performance, reduces system power dissipation, the user experience is improved.
Here, referring to Fig. 4, the LCD control circuit further includes the input terminal positioned at the high level holding circuit 302
Rectifier diode D1 between the output end of the LCD panel 303；Anode and the face LCD of the rectifier diode D1
The output end of plate 303 connects；The cathode of the rectifier diode D1 is connect with the input terminal of the high level holding circuit 302.
Specifically, rectifier diode D1 is used to limit the current direction between LCD panel 303 and high level holding circuit 302, so that electric
Stream only can flow to high level holding circuit 302 from LCD panel 303, avoid the electric current shadow of 302 input terminal of high level holding circuit
Ring the level of the output end of LCD panel 303.Optionally, since low pressure drop diode is a kind of low-power consumption, Speed Semiconductor
Device, most significant feature are that reverse recovery time is extremely short, therefore the rectifier diode D1 can select low pressure drop diode, pressure
Drop is no more than 0.3V, such as Schottky diode and germanium diode.
Here, referring to Fig. 5, the high level holding circuit 302 includes voltage holding capacitor C1, the voltage keeps electricity
The one end for holding C1 is connect with the output end of the LCD panel 303, and the other end is connect with ground GND.Specifically, voltage holding capacitor
C1 charges when 303 output end of LCD panel exports high level, so that the connection of voltage holding capacitor C1 and LCD panel 303
The level of point is high level；303 output end of LCD panel export low level when discharge so that voltage holding capacitor C1 with
It is low level that the level of the tie point of LCD panel 303 changes from high level.If the high level of 303 output end of LCD panel output is
1.8V, for make voltage holding capacitor C1 303 output end of LCD panel export low level when still can in the state of high level,
Voltage holding capacitor C1 needs are maintained at 0.9V or more in specific time, and the 0.9V is the high level threshold voltage of system,
The specific time can be 5ms, 10ms or 20ms etc., when it is low level that 303 output end of LCD panel, which persistently inputs,
Voltage holding capacitor C1 needs to drop to 0.2V within the 2s time low level threshold voltage hereinafter, the 0.2V is system.Before
Stating 1.8V, 0.9V, 2s and 0.2V is the switching for illustrating the working condition of voltage holding capacitor C1, is not used to specifically limit
The running parameter of constant voltage holding capacitor C1, the running parameter of voltage holding capacitor C1 can carry out accordingly according to the actual situation
Selection.By the setting of voltage holding capacitor C1, the height electricity of the tie point of voltage holding capacitor C1 and LCD panel 303 is realized
It is flat to keep.
Here, referring to Fig. 6, the high level holding circuit 302 further includes discharge resistance R1, the discharge resistance R1 with
The voltage holding capacitor C1 is in parallel.Specifically, the output end of one end of the discharge resistance R1 and the LCD panel 303 connects
It connects, the other end is connect with ground GND.The discharge resistance R1 is in parallel with voltage holding capacitor C1, defeated in 303 output end of LCD panel
Out when high level, voltage holding capacitor C1 charging；When 303 output end of LCD panel exports low level, voltage holding capacitor C1 is logical
Overdischarge resistance R1 electric discharge, discharge resistance R1 and voltage holding capacitor C1 are worked together, and guarantee to support in the output of LCD panel 303
When continuous input is low level, voltage holding capacitor C1 discharged by discharge resistance R1 to drop to 0.2V within the 2s time hereinafter,
The 0.2V is the low level threshold voltage of system.Aforementioned 2s and 0.2V is to illustrate voltage holding capacitor C1 and electric discharge electricity
The switching for hindering the working condition of voltage holding capacitor C1 when R1 is worked together, is not used to specifically limit discharge resistance R1 and voltage
The running parameter of the running parameter of holding capacitor C1, discharge resistance R1 and voltage holding capacitor C1 can carry out according to the actual situation
Corresponding selection.By the setting of discharge resistance R1, the electricity release of voltage holding capacitor C1 is realized, voltage holding is realized
The level change of capacitor C1 and the tie point of LCD panel 303.
Here, the execution circuit 305 includes processor, the first input/output port of the processor and the logic
The input terminal of decision circuitry 301 connects, the input terminal of the second input/output port of the processor and the LCD panel 303
Connection.Specifically, processor can be a kind of IC chip, the processing capacity with signal.The processor is according to institute
The signal for stating the transmission of logic judging circuit 301 executes corresponding program, controls the opening and closing of LCD panel 303, realizes LCD
Panel 303 power on and lower electricity.Optionally, processor can be general processor, digital signal processor (Digital
Signal Processor, DSP), specific integrated circuit (Application Specific Integrated Circuit,
ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic
Device, discrete gate or transistor logic, discrete hardware components.Here, the program that the processor executes can store
Among the memory being connect with the processor by bus, the memory can be volatile memory or non-volatile
Memory may also comprise both volatile and non-volatile memories.Wherein, nonvolatile memory can be read-only memory
(ROM, Read Only Memory), programmable read only memory (PROM, Programmable Read-Only Memory),
Erasable Programmable Read Only Memory EPROM (EPROM, Erasable Programmable Read-Only Memory), electric erasable
Programmable read only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory),
Magnetic RAM (FRAM, ferromagnetic random access memory), flash memory (Flash
Memory), magnetic surface storage, CD or CD-ROM (CD-ROM, Compact Disc Read-Only Memory)；Magnetic
Memory surface can be magnetic disk storage or magnetic tape storage.Volatile memory can be random access memory (RAM,
Random Access Memory), it is used as External Cache.By exemplary but be not restricted explanation, many forms
RAM it is available, such as static random access memory (SRAM, Static Random Access Memory), synchronize it is static with
Machine accesses memory (SSRAM, Synchronous Static Random Access Memory), dynamic random access memory
Device (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM,
Synchronous Dynamic Random Access Memory), double data speed synchronous dynamic RAM
It is (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), enhanced same
Walk dynamic random access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access
Memory), synchronized links dynamic random access memory (SLDRAM, Sync Link Dynamic Random Access
Memory), direct rambus random access memory (DRRAM, Direct Rambus Random Access Memory).
The memory of description of the embodiment of the present invention is intended to include but is not limited to the memory of these and any other suitable type.The present invention
Memory in embodiment is for storing various types of data to support the operation of the processor.The example packet of these data
It includes: for any computer program of processor operation, such as operating system and application program；Contact data；Telephone directory number
According to；Message；Picture；Video etc..Wherein, operating system includes various system programs, such as ccf layer, core library layer, driving layer
Deng for realizing various basic businesses and the hardware based task of processing.
Here, the execution circuit 305 includes Power Management Unit, and the input terminal of the Power Management Unit is patrolled with described
Collect the output end connection of decision circuitry 301, the input terminal company of the output end of the Power Management Unit and the LCD panel 303
It connects.Specifically, Power Management Unit (Power Management, PM) can be power management chip, realize input and output electricity
Source control controls the connecting and disconnecting between LCD panel 303 and 303 power supply of LCD panel, the Power Management Unit
Input terminal is connect with the output end of logic judging circuit 301, receives the electric signal that logic judging circuit 301 is sent, and according to institute
It states electric signal and connecting and disconnecting is carried out to the power supply of LCD panel 303, realize powering on and lower electricity for LCD panel 303.
Here, the execution circuit 305 includes Power Management Unit and processor；The input terminal of the Power Management Unit
It is connect with the output end of the logic judging circuit 301, the first of the output end of the Power Management Unit and the processor
Input/output port connection, the second input/output interface of the processor are connect with the input terminal of the LCD panel 303.Tool
Body, Power Management Unit receives the electric signal that logic judging circuit 301 is sent, and the electricity that logic judging circuit 301 is sent
Processor is sent to after signal forwarding or processing, processor receives the electric signal that Power Management Unit is sent, and according to power supply
The electric signal that administrative unit is sent carries out connecting and disconnecting to the power supply of LCD panel 303, realizes powering on for LCD panel 303
With lower electricity.
Here, the oscillating circuit 304 includes power-management interface unit, the output end of the power-management interface unit
It is connect with the second input terminal of the logic judging circuit 301.Specifically, the power-management interface unit (Power
Management Interface, PMI) it can be power management chip, it realizes input and output power management, LCD panel is provided
303 backlight voltage and the bias voltage of LCD panel 303, the power-management interface unit have universal input/output interface
(General Purpose Input Output, GPIO), by GPIO can be can be with output pwm signal, frequency 10Hz,
50Hz perhaps the 100Hz corresponding period can be 100ms, 20ms perhaps 10ms duty ratio can be 10%, 20% or
50%, the frequency of oscillating circuit, period and duty ratio can be arranged accordingly according to the actual situation in practical applications.
Here, the logic judging circuit 301 is or door.Specifically, the logic judging circuit 301 be two input or
Door, described or door one of input terminal connect with the output end of the high level holding circuit 302, another input terminal and
The output end of the oscillating circuit 304 connects, and described or door output end is connect with the input terminal of the execution circuit 305, real
Show when high level holding circuit 302 and oscillating circuit 304 any one output is high level, output high level letter
Number, when the output of 304 the two of high level holding circuit 302 and oscillating circuit is low level, export low level signal.
In this way, by the way that the level signal of LCD panel 303 is carried out high level holding, and it is total with the signal of oscillating circuit 304
With logic judgment is carried out, being restarted automatically for LCD is realized according to logic judgment result, system resource has been saved, ensure that LCD
Can, system power dissipation is reduced, the user experience is improved.
The invention also provides a kind of terminal, including LCD control circuit, the LCD control circuit includes: logic judgment electricity
Road, high level holding circuit, LCD panel, oscillating circuit and execution circuit；The logic judging circuit include first input end,
Second input terminal and output end；The output end of the high level holding circuit and the first input end of the logic judging circuit connect
It connects；The output end of the LCD panel is connect with the input terminal of the high level holding circuit；The output end of the oscillating circuit with
Second input terminal of the logic judging circuit connects；The output of the input terminal of the execution circuit and the logic judging circuit
End connection, the output end of the execution circuit are connect with the input terminal of the LCD panel.
Here, the LCD control circuit further includes the input terminal positioned at the high level holding circuit and the LCD panel
Output end between rectifier diode；The anode of the rectifier diode is connect with the output end of the LCD panel；It is described whole
The cathode of stream diode is connect with the input terminal of the high level holding circuit.
Here, the high level holding circuit includes voltage holding capacitor, one end of the voltage holding capacitor with it is described
The output end of LCD panel connects, and the other end is connected to ground.
Here, the high level holding circuit further includes discharge resistance, the discharge resistance and the voltage holding capacitor
It is in parallel.
Here, the execution circuit includes processor, and the first input/output port and the logic of the processor are sentenced
The input terminal of deenergizing connects, and the second input/output port of the processor is connect with the input terminal of the LCD panel.
Here, the execution circuit includes Power Management Unit, the input terminal of the Power Management Unit and the logic
The output end of decision circuitry connects, and the output end of the Power Management Unit is connect with the input terminal of the LCD panel.
Here, the execution circuit includes Power Management Unit and processor；The input terminal of the Power Management Unit with
The output end of the logic judging circuit connects, and the output end of the Power Management Unit and the first input of the processor are defeated
Exit port connection, the second input/output interface of the processor are connect with the input terminal of the LCD panel.
Here, the oscillating circuit includes power-management interface unit, the output end of the power-management interface unit with
Second input terminal of the logic judging circuit connects.
Here, the logic judging circuit is or door.
To be illustrated below with an optional specific embodiment convenient for the understanding to technical solution of the present invention:
Referring to Fig. 7, CPU is central processing unit (Central Processing Unit), MIPI_DSI0_CLK_P/N
It is No. 0 display serial interface clock pin of mobile industry processor interface, MIPI_DSI0_LANE1_P/N is mobile production
No. 0 the 1st pin of display serial line interface channel of industry processor interface, MIPI_DSI0_LANE2_P/N is mobile Enterprise Administration Office
No. 0 the 2nd pin of display serial line interface channel of device interface is managed, MIPI_DSI0_LANE3_P/N is mobile Industry Processor
No. 0 the 3rd pin of display serial line interface channel of interface, MIPI_DSI1_CLK_P/N is mobile industry processor interface
No. 1 display serial interface clock pin, MIPI_DSI1_LANE1_P/N are that No. 1 of mobile industry processor interface is aobvious
Show that the 1st pin of device serial line interface channel, MIPI_DSI1_LANE2_P/N are No. 1 displays of mobile industry processor interface
The 2nd pin of serial line interface channel, MIPI_DSI1_LANE3_P/N are that No. 1 display of mobile industry processor interface is serial
The 3rd pin of interface channel, GPIO_6 are the 6th universal input/output interfaces, and GPIO_10 is the 10th universal input/output interface；K1
It is switch, power key and the effective pin PWR_KY_N of low level and ground are connected when closure, and LDO is low pressure difference linear voltage regulator pipe
Foot (Low Dropout Regulator)；VDISP_P_OUT is positive bias voltage output, and VDISP_M_OUT is negative bias voltage
Output, White LED driver is white LED driver, and VREG_WLED is regulated power supply delivery outlet, and WLED_SINK1 is the 1st
Pin is communicated, WLED_SINK2 is the 2nd communication pin, and WLED_SINK3 is the 3rd communication pin, and WLED_SINK4 is the 4th communication
Pin；Display connector is display interface, and RST is to reset (reset), and TE is frame synchronization feedback (Tearing
Effect), IO is input and output pin, and VSP is positive bias voltage, and the negative good fortune bias voltage of VSN, LCD WLED is the white light of LCD
LED。
When there are power supply and when LCD control circuit does not power on, PMI GPIO power supply just exports always 1.8V voltage, i.e., high electricity
It is flat；After LCD control circuit powers on, PMI GPIO output pwm signal, frequency 100Hz, period 10ms, duty ratio is
50%.
When LCD is normally shown, the CABC pin of LCD panel is that 16.67ms frequency is according to the display content output period
The pwm signal of 60Hz, corresponding LCD display refresh rates are 60Hz；When the pwm signal of LCD panel CABC output is single week
When high level in the phase, rectifier diode D1 conducting charges to voltage holding capacitor C1, therefore the pin of the high level signal and PMI
GPIO output signal by or door X processing after, export and receive high level signal for high level H1, the PWR_KY_N of PM, by
In PWR_KY_N be power key and low level is effective, therefore is generated without key-press event；When the pwm signal of LCD panel CABC output
When for low level in signal period, rectifier diode D1 cut-off, voltage holding capacitor C1 maintains electricity because charge exists
Pressure, therefore CABC signal is still high level after one-way conduction diode and capacitor when normal work, therefore the height is electric
Ordinary mail number and PMI GPIO signal by or door X processing after, export and receive high level letter for high level H1, the PWR_KY_N of PM
Number, since PWR_KY_N is power key and low level is effective, no key-press event is generated.
When LCD abnormal show blank screen, the CABC pin output of LCD panel becomes low level, at this time rectifier diode D1
By voltage holding capacitor C1 maintains voltage because charge exists；As the time increases voltage holding capacitor C1 storage
Energy is fallen by discharge resistance R1 slow release, at this time the level at the tie point of rectifier diode D1 and voltage holding capacitor C1
Become low level L1, be divided into following two situation below according to the level difference of the pwm signal of the pin GPIO output of PMI:
The first situation, if the pwm signal that the pin GPIO of PMI is exported is the low level signal in signal period, therefore with
Low level L1 by or door X processing after output be low level, the pin PWR_KY_N of PM receives low level signal, power button
Event generates, and LCD control circuit enters dormant state, and LCD power supply timing enters lower electric timing；By the time T0 (pin of PMI
The pwm signal period of GPIO output is 10ms, duty ratio 50%, therefore T0 is less than 5ms) after, the pin GPIO of PMI output
Pwm signal overturning be high level, therefore with low level L1 by or door X processing after output be high level, the pin PWR_KY_N of PM
Receive high level signal, the release of power button event；By time T1 (PMI pin GPIO output the pwm signal period be
10ms, duty ratio 50%, therefore T1 is equal to 5ms) after, the pwm signal overturning of the pin GPIO output of PMI is low level, therefore with
Low level L1 by or door X processing after output be low level, the pin PWR_KY_N of PM receives low level, power button event
It generates, LCD control circuit wakes up, and LCD power supply timing, which is reappeared, enters electrifying timing sequence, and the CABC signal of LCD panel restores normal, i.e.,
The output period is the pwm signal that 16.67ms frequency is 60Hz, and LCD is normally shown.By time T2, (the pin GPIO of PMI is exported
The pwm signal period be 10ms, duty ratio 50%, therefore T2 is equal to 5ms) after, the pwm signal of the GPIO of PMI pin output turns over
Switch to high level, thus with low level L1 by or door X processing after output be high level, the pin PWR_KY_N of PM receives high electricity
Ordinary mail number, the release of power button event.
Second situation if the pwm signal that exports of the pin GPIO of PMI is high level, therefore is passed through or door X with low level L1
Output is high level after processing, and the pin PWR_KY_N input of PM is high level signal, and non-transformer key-press event generates；When passing through
Between T (PMI pin GPIO output pwm signal period be 10ms, duty ratio 50%, thus T be less than 5ms) after, the pipe of PMI
Foot GPIO output pwm signal overturning be low level, therefore with low level L1 by or door X processing after output be low level, PM's
Pin PWR_KY_N receives low level signal, and power button event generates, and LCD control circuit enters dormant state, LCD power supply
Timing enters lower electric timing；By time T0, (period of the pwm signal of the pin GPIO output of PMI is 10ms, and duty ratio is
50%, therefore T0 is equal to 5ms) after, the pwm signal output switching activity of the pin GPIO output of PMI is high level, therefore is passed through with low level L1
Cross or door X processing after output be high level, the pin PWR_KY_N of PM receives high level signal, the release of power button event；
After time T1 (PMI GPIO PWM cycle is 10ms, therefore T1 is equal to 5ms), the pwm signal of the pin GPIO output of PMI is turned over
Switch to low level, thus with low level L1 by or door X processing after output be low level, the pin PWR_KY_N of PM receives low electricity
Ordinary mail number, power button event generate, and LCD control circuit wakes up, and LCD power supply timing, which is reappeared, enters electrifying timing sequence, LCD panel
CABC signal restores normal, i.e. the output period is the pwm signal that 16.67ms frequency is 60Hz, and LCD is normally shown.By the time
After T2 (PMI GPIO PWM cycle is 10ms, therefore T2 is equal to 5ms), the pwm signal output switching activity of the pin GPIO output of PMI is
High level signal, thus with low level L1 by or door X processing after output be high level, the pin PWR_KY_N of PM receives high electricity
Ordinary mail number, the release of power button event.
In this way, by the way that the CABC level signal of LCD panel is carried out high level holding, and the PWM with the GPIO of PMI output
Signal carries out logic judgment jointly, realizes being restarted automatically for LCD according to logic judgment result, has saved system resource, guarantees
LCD performance, reduces system power dissipation, the user experience is improved.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal (can be mobile phone, computer, service
Device, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of LCD control circuit characterized by comprising logic judging circuit, high level holding circuit, LCD panel, vibration
Swing circuit and execution circuit；
The logic judging circuit includes first input end, the second input terminal and output end；
The output end of the high level holding circuit is connect with the first input end of the logic judging circuit；
The output end of the LCD panel is connect with the input terminal of the high level holding circuit；
The output end of the oscillating circuit is connect with the second input terminal of the logic judging circuit；
The input terminal of the execution circuit is connect with the output end of the logic judging circuit, the output end of the execution circuit with
The input terminal of the LCD panel connects.
2. LCD control circuit according to claim 1, which is characterized in that the LCD control circuit further includes positioned at described
Rectifier diode between the input terminal of high level holding circuit and the output end of the LCD panel；
The anode of the rectifier diode is connect with the output end of the LCD panel；
The cathode of the rectifier diode is connect with the input terminal of the high level holding circuit.
3. LCD control circuit according to claim 1, which is characterized in that the high level holding circuit includes that voltage is protected
Capacitor is held, one end of the voltage holding capacitor is connect with the output end of the LCD panel, and the other end is connected to ground.
4. LCD control circuit according to claim 3, which is characterized in that the high level holding circuit further includes electric discharge
Resistance, the discharge resistance are in parallel with the voltage holding capacitor.
5. LCD control circuit according to claim 1, which is characterized in that the execution circuit includes processor, the place
First input/output port of reason device is connect with the input terminal of the logic judging circuit, the second input and output of the processor
Port is connect with the input terminal of the LCD panel.
6. LCD control circuit according to claim 1, which is characterized in that the execution circuit includes Power Management Unit,
The input terminal of the Power Management Unit is connect with the output end of the logic judging circuit, the output of the Power Management Unit
End is connect with the input terminal of the LCD panel.
7. LCD control circuit according to claim 1, which is characterized in that the execution circuit includes Power Management Unit
And processor；
The input terminal of the Power Management Unit is connect with the output end of the logic judging circuit, the Power Management Unit
Output end is connect with the first input/output port of the processor, the second input/output interface of the processor with it is described
The input terminal of LCD panel connects.
8. LCD control circuit according to claim 1, which is characterized in that the oscillating circuit includes power-management interface
Unit, the output end of the power-management interface unit are connect with the second input terminal of the logic judging circuit.
9. LCD control circuit according to any one of claim 1 to 8, which is characterized in that the logic judging circuit is
Or door.
10. a kind of terminal, which is characterized in that including LCD control circuit as claimed in any one of claims 1-9 wherein.
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| CN113411102A (en) * | 2021-06-24 | 2021-09-17 | 珠海格力电器股份有限公司 | Data transmission method, device and system |
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