CN113160759A - Display screen circuit selection method, intelligent networking equipment mainboard and electronic equipment - Google Patents

Display screen circuit selection method, intelligent networking equipment mainboard and electronic equipment Download PDF

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Publication number
CN113160759A
CN113160759A CN202110351685.4A CN202110351685A CN113160759A CN 113160759 A CN113160759 A CN 113160759A CN 202110351685 A CN202110351685 A CN 202110351685A CN 113160759 A CN113160759 A CN 113160759A
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display screen
screen interface
backlight
interface
display
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CN113160759B (en
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李国锋
张树民
邓志伟
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Zhidao Wanglian Technology Shenzhen Co ltd
Zhidao Network Technology Beijing Co Ltd
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Zhidao Wanglian Technology Shenzhen Co ltd
Zhidao Network Technology Beijing Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a display screen circuit selection method, an intelligent networking equipment mainboard and electronic equipment, and belongs to the field of intelligent networking equipment, wherein the method comprises the following steps: configuring a first display screen interface, a second display screen interface, a first backlight power circuit and a second backlight power circuit of a mainboard of the intelligent network connection equipment; determining the type of a display screen connected with a mainboard of the intelligent networking equipment, wherein the type of the display screen comprises a display screen corresponding to a first display screen interface and a display screen corresponding to a second display screen interface; under the condition that the display screen type is the display screen corresponding to the first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel; and under the condition that the display screen type is the display screen corresponding to the second display screen interface, selecting the second backlight power supply circuit to supply power to the second display screen interface in the second display channel. The invention can effectively save hardware cost and is convenient for hardware management and maintenance.

Description

Display screen circuit selection method, intelligent networking equipment mainboard and electronic equipment
Technical Field
The invention relates to the technical field of intelligent networking equipment, in particular to a display screen circuit selection method, an intelligent networking equipment mainboard and electronic equipment.
Background
An LED backlight lamp of an intelligent network equipment display screen in the market is generally in a 6-string 6-parallel (a lamp bead arrangement mode) structure, an intelligent network equipment main board is required to provide current of about 200mA for the intelligent network equipment display screen, and a corresponding data display is an LVDS (Low-Voltage Differential Signaling) interface. Besides a common 6-string 6-parallel structure, the display screen LED backlight lamp also has a 3-string 10-parallel circuit structure, an intelligent network connection equipment mainboard is required to provide the current of about 300mA for the display screen LED backlight lamp, and the corresponding data display is an MIPI (Mobile Industry Processor Interface).
Because the value (such as 200mA or 300mA) of the backlight current required to be provided is different from the data interface (such as an LVDS interface or an MIPI interface), the prior art needs to configure two different types of hardware versions for the two different display screen hardware designs, that is, needs to design two different types of single boards, which brings more troubles to design management, especially to later maintenance.
Disclosure of Invention
The invention provides a display screen circuit selection method, an intelligent networking equipment mainboard and electronic equipment, which are used for solving the problem of maintenance trouble caused by a plurality of single boards in the prior art and realizing the integration of the circuit design of the plurality of display screen single boards on one hardware circuit board.
The invention provides a display screen circuit selection method, which is applied to a mainboard of intelligent networking equipment and comprises the following steps:
configuring a first display screen interface, a second display screen interface, a first backlight power circuit and a second backlight power circuit of an intelligent network connection equipment mainboard, wherein the backlight current of the first display screen interface is larger than the backlight current of the second display screen interface, the first backlight power circuit outputs the backlight current of the first display screen interface, and the second backlight power circuit outputs the backlight current of the second display screen interface;
determining the type of a display screen connected with the main board of the intelligent networking equipment, wherein the type of the display screen comprises a display screen corresponding to the first display screen interface and a display screen corresponding to the second display screen interface;
under the condition that the display screen type is the display screen corresponding to the first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel;
and under the condition that the display screen type is the display screen corresponding to the second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel.
In the method for selecting a display screen circuit according to the present invention, the determining a type of a display screen connected to a motherboard of the intelligent networking device includes:
acquiring a detection signal of the second display screen interface through a first detection signal line of the intelligent network connection equipment mainboard;
and controlling a protocol conversion chip of the intelligent network equipment mainboard to output display data to a corresponding first display screen interface or a corresponding second display screen interface according to the detection signal.
In the method for selecting a display screen circuit, when the display screen type is a display screen corresponding to a first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel includes:
when the detection signal is at a high level, enabling a second enabling signal of the protocol conversion chip, which is used for enabling the intelligent networking equipment mainboard, to be at a low level, and outputting display data to a first display screen interface through the protocol conversion chip;
when the detection signal is at a low level, a first enabling signal for enabling the intelligent network connection equipment mainboard is at a high level, and the first backlight power supply circuit outputs a corresponding current value to the first display screen interface.
In the method for selecting a display screen circuit, when the display screen type is a display screen corresponding to a second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel includes:
when the detection signal is at a low level, enabling a second enabling signal of the protocol conversion chip, which is used for enabling the intelligent network connection equipment mainboard, to be at a high level, and outputting display data to a second display screen interface through the protocol conversion chip;
when the detection signal is at a low level, a first enabling signal for enabling the intelligent network connection equipment mainboard is at a low level, and the second backlight main power supply circuit outputs a corresponding current value to the second display screen interface.
The invention also provides an intelligent network equipment mainboard, which comprises a main control module, a protocol conversion chip, a backlight power supply module and a display screen interface connected with the backlight power supply module, wherein the main control module is provided with a preset controller, the backlight power supply module comprises a first resistor,
the backlight power supply module further comprises a first circuit and a second circuit which are connected in parallel, the first circuit comprises a first MOS (metal oxide semiconductor) tube connected with the first resistor in series, the second circuit comprises a second MOS tube and a second resistor connected in series, and the main control module drives the second MOS tube through a first enabling signal line and drives the first MOS tube through a phase inverter;
the display screen interface comprises a first display screen interface and a second display screen interface, the preset controller is respectively connected with the first display screen interface and the second display screen interface through the protocol conversion chip, and the first display screen interface and the second display screen interface are both connected with the output end of the backlight power supply module;
the second display screen interface is connected with the main control module through a first detection signal line, and the main control module is connected with the protocol conversion chip through a second enabling signal line.
According to the intelligent networking equipment mainboard provided by the invention, the preset controller is connected with the protocol conversion chip through a first data line, the first data line is connected to the pin bifurcation of the protocol conversion chip and is connected to a first display screen interface through a capacitor which is connected in series and close to the pin, and data of the first data line is converted by the protocol conversion chip and then is output to a second display screen interface through a second data line.
According to the mainboard of the intelligent networking equipment, the first enabling signal line is connected with the G pole of the second MOS tube, the D pole of the second MOS tube is connected with the second resistor, and the S pole of the second MOS tube is connected with the S pole of the first MOS tube.
According to the intelligent networking equipment mainboard provided by the invention, the first enabling signal line is connected with the input stage of the phase inverter, the output stage of the phase inverter is connected with the G pole of the first MOS tube, and the D pole of the first MOS tube is connected with the first resistor.
According to the intelligent network equipment mainboard provided by the invention, the backlight power supply module comprises a power supply input end, a backlight main power supply connected with the power supply input end and an output end connected with the backlight main power supply, the backlight main power supply is connected with the first resistor, the first resistor is a regulating resistor of the output current of the backlight power supply module, and the first resistor and the second resistor are controlled by the first enabling signal line to realize the output of the corresponding current value of the backlight main power supply.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the steps of the method for realizing the mainboard of the intelligent networking device.
The present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for selecting a display screen circuit of a motherboard of an intelligent networking device as described in any one of the above.
According to the intelligent networking equipment mainboard, the design method and the electronic equipment, the detection signal of the second display screen interface is obtained through the first detection signal line, the protocol conversion chip outputs display data to the corresponding first display screen interface or the second display screen interface, the backlight main power supply outputs the corresponding current value to the corresponding display screen interface, the circuit of the first display screen interface and the circuit of the second display screen interface are integrated on the same circuit board, hardware cost is effectively saved, and hardware management and maintenance are facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a motherboard of an intelligent networking device provided in the prior art;
fig. 2 is a second schematic structural diagram of a motherboard of an intelligent networking device provided in the prior art;
fig. 3 is a schematic structural diagram of a motherboard of an intelligent networking device provided by the invention;
FIG. 4 is a flow chart of a display screen circuit selection method provided by the present invention;
FIG. 5 is a schematic flow chart of selecting a first display interface provided by the present invention;
FIG. 6 is a schematic flow chart of selecting a second display interface provided by the present invention;
fig. 7 is a flowchart of a method for designing a motherboard of an intelligent networking device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.
The technical terms to which the present invention relates are described below:
a Mobile Industry Processor (MIPI) is an open standard and a specification established for a Mobile application Processor by the MIPI alliance. The method mainly standardizes the interfaces (a camera, a display screen interface, a radio frequency/baseband interface) and the like in the mobile phone, thereby reducing the complexity of the interfaces in the mobile phone and increasing the flexibility of design.
LVDS (Low-Voltage Differential Signaling, abbreviated as LVDS), i.e. Low-Voltage Differential signals, also called TIA/EIA-644, is a technical standard and also a Low-Voltage Differential signal technical interface. The digital video signal transmission mode is developed for overcoming the defects of high power consumption, high EMI electromagnetic interference and the like when broadband high-code-rate data is transmitted in a TTL level mode.
Differences between LVDS and MIP:
the LVDS output interface is used for transmitting low-voltage differential signals, and the output interface is adopted, so that the signals can be transmitted on a differential PCB or a balance cable, and low noise and low power consumption are realized due to the adoption of a low-voltage and low-current driving mode. The LVDS output interface is connected with the liquid crystal display, and the LVDS interface is only used for transmitting video data. The MIPI signals are transmitted in pairs, interference is mainly reduced, the MIPI signals are routed in pairs, the two wires are in opposite phases in waveform, so that external interference is generated, most of the MIPI signals can be offset, the MIPI signals are mainly used on a flat panel and a mobile phone, and the MIPI signals can transmit video data and can transmit control instructions.
An LED backlight of a display screen of an intelligent internet device (such as a vehicle-mounted multimedia device, i.e., a car machine) in the market is generally in a 6-string and 6-parallel (an arrangement manner of lamp beads), a typical value of required supply current is about 200mA, a corresponding data display is an LVDS interface, and a typical circuit is shown in fig. 1.
Fig. 1 is a schematic structural diagram of a motherboard of an intelligent networking device provided in the prior art, as shown in fig. 1. The intelligent internet device motherboard 1 in the figure includes a main control module 2, a preset controller (for example, an MIPI controller) 3, a protocol conversion chip 4, a display screen interface 5, and a backlight power module 6.
In the backlight power module 6, U1 is a backlight main power supply, Vin is a power input (i.e., an input terminal), Vout is a power output (i.e., an output terminal), Cin is a power input filter capacitor, Cout is a power output filter capacitor, L is a power matching inductor, D is a diode, and the first resistor R1 is an output current adjusting resistor.
The backlight main power supply U1 is a constant current source output, the output current is fed back by a feedback reference voltage VFBThe resistance R1 is controlled together, and the calculation formula is as follows:
Figure BDA0003002546530000071
wherein, VFBThe value is a fixed value, determined by the backlight main power chip U1, and is typically set to 0.2V, for example, when 200mA is required to be output, the value of the first resistor R1 may be 1 ohm. The output end Vout of the cyan light power supply module 6 is connected with the display screen interface 5 and supplies backlight power to the display screen interface 5.
For the data display channel, since the main control module 2 is an interface of the MIPI controller 3, if the data display channel is an LVDS display screen, a protocol conversion chip 4 needs to be added in the figure, and the protocol conversion chip 4 is used for converting MIPI data into LVDS data for output. The protocol conversion chip 4 inputs the LVDS data into a display screen interface 5 (for example, an LVDS display screen interface), and the display screen interface 5 is connected to a corresponding display screen (for example, an LVDS display screen).
Besides the common 6-string 6-parallel structure, the display screen LED backlight also has a 3-string 10-parallel circuit structure and a corresponding display screen interface 5 for data display, such as an MIPI interface. The problem brought to the hardware design is that the motherboard backlight power supply circuit needs to provide 300mA of current (it can be calculated from the above formula, only the first resistor R1 is adjusted to 0.67 ohm, and then the corresponding screen can be adapted), and at the same time, an interface of the MIPI controller 3 of the main control module 2 needs to be directly connected, and the circuit structure is as shown in fig. 2.
Fig. 2 is a second schematic structural diagram of a motherboard of an intelligent networking device provided in the prior art, as shown in fig. 2. The intelligent network equipment mainboard 1 in the figure comprises a main control module 2, an MIPI controller 3, a display screen interface 5 and a backlight power supply module 6. Since the corresponding display screen interface 5 in fig. 2 is an MIPI interface, the protocol conversion chip 4 is not required to convert the display data.
To sum up, the main board of the intelligent networking device in the prior art needs to be adapted to different display screens, and generally needs to be provided with two kinds of boards (for example, two kinds of boards shown in fig. 1 and fig. 2): one is a mainboard of an LVDS interface with backlight current of 200mA, and the other is a mainboard of an MIPI interface with backlight current of 300 mA. Due to the difference of backlight current and data interfaces, two different types of hardware versions are required to be configured for two different display screen hardware designs, and the problems that the two hardware versions need to be designed and maintained and corresponding troubles are brought to hardware management and designers.
Based on this, the invention provides a unified display screen software and hardware circuit implementation method, which can integrate the two display screen circuit designs on one hardware circuit board, and implement the circuit design and the selection constraint on the PCB routing and devices of the circuit board, and integrate the first display screen interface (such as MIPI screen interface) and the second display screen interface (such as LVDS screen interface) on one hardware circuit board. The hardware of the mainboard automatically identifies the type of an external display screen (such as an MIPI display screen or an LVDS display screen) and controls a circuit to select a corresponding backlight power supply and a corresponding display channel, so that the purpose that one hardware circuit board can be adapted to different display screens and different application scenes is achieved; while reducing the cost of hardware development and maintenance.
A display screen circuit selection method, an intelligent networking device motherboard, and an electronic device according to the present invention are described below with reference to fig. 3 to 8.
Fig. 3 is a schematic structural diagram of a motherboard of an intelligent networking device provided by the invention, as shown in the figure. The utility model provides an intelligence networking devices mainboard 1, including host system 2, protocol conversion chip 4, power module 6 and with the display screen interface that power module connects is shaded, the display screen interface includes first display screen interface 7 and second display screen interface 8, host system 2 is equipped with MIPI controller 3.
In the backlight power module 6, U1 is a backlight main power source, Vin is a power input (i.e., an input end), Vout is a power output (i.e., an output end), Cin is a power input filter capacitor, Cout is a power output filter capacitor, L is a power matching inductor, D is a diode, and the first resistor R1 is an output current adjusting resistor.
Preferably, the backlight power module 6 further includes a first circuit and a second circuit connected in parallel, the first circuit includes a first MOS transistor Q1 connected in series with the first resistor, and the second circuit includes a second MOS transistor Q2 and a second resistor R2 connected in series. Master control module 2 drives through first enabling signal line Power _ EN second MOS pipe Q2, master control module 2 passes through first MOS pipe Q1 of inverter drive through first enabling signal line Power _ EN. The first resistor R1 is a regulating resistor for the output current of the backlight Power module 6, and the first resistor R1 and the second resistor R2 can be controlled by the first enable signal line Power _ EN to realize that the backlight main Power U1 outputs a corresponding current value.
Specifically, the first enable signal line Power _ EN is connected to a G-pole of the second MOS transistor Q2, a D-pole of the second MOS transistor Q2 is connected to the second resistor, and an S-pole of the second MOS transistor Q2 is connected to an S-pole of the first MOS transistor; the first enable signal line Power _ EN is connected with the input stage of the phase inverter, the output stage of the phase inverter is connected with the G pole of the first MOS tube Q1, and the D pole of the first MOS tube Q1 is connected with the first resistor.
In the above circuit design, when the first enable signal line Power _ EN is at a high level, the current control channel of the second resistor R2 is turned on, the current control channel of the first resistor R1 is turned off, and the backlight Power supply outputs a 300mA current to the first display screen interface 7; when the first enable signal line Power _ EN is at a low level, the first R1 current control channel is turned on, the second R2 current control channel is turned off, and the backlight Power supply outputs a 200mA current to the second display interface 8. Specifically, the values of the N-MOS transistor (Q1, Q2) and related devices are described as follows:
(1) an N-MOS transistor with a small dc voltage drop needs to be selected, and typically, under the condition that the GS interpolar control voltage is 3.3V, the DS interpolar voltage drop is 50mV at a current of 200mA and 100mV at a current of 300 mA.
(2) From the above, since the voltage drop is 150mV when the current passes through the first resistor R1 and reaches 200mA, the value of the second resistor R2 is 0.75 ohm; the voltage drop of 100mV when the current passes through the second resistor R2 at 300mA, so that the value of the second resistor R2 is 0.33 ohm.
(3) The inverter is used for inverting the control signal Power _ EN, and outputs high level when the input Power _ EN is low level, and the chip of the inverter can adopt a chip with model number SN74AHC1G04, but the invention is not limited to the chip with model number SN74AHC1G 04.
Preferably, the MIPI controller 3 is connected to the first display interface 7 and the second display interface 8 through the protocol conversion chip 4, the first display interface 7 and the second display interface 8 are both connected to the output terminal Vout of the backlight power module 6, and the backlight main power supply U1 provides backlight power for the first display interface 7 and the second display interface 8. The first display screen interface 7 may be an MIPI display screen interface, and the second display screen interface 8 may be an LVDS display screen interface. Correspondingly, the first display screen may be an MIPI display screen, and the second display screen may be an LVDS display screen.
Preferably, the second display screen interface is connected to the main control module 2 through a first detection signal line LVDS _ DET, and the main control module 2 is connected to the protocol conversion chip 4 through a second enable signal line LVDS _ EN.
Specifically, the first detection signal line LVDS _ DET is used to indicate insertion of a second display screen (e.g., an LVDS display screen). When an LVDS display screen is inserted, the first detection signal line LVDS _ DET inputs a low level to the main control module 2; when the receptacle of the LVDS display is suspended, the first detection signal line LVDS _ DET inputs a high level to the main control module 2.
In a specific implementation, the first detection signal line LVDS _ DET may be connected to a GPIO pin of the main control module 2 having a built-in pull-up resistor, and the socket may be connected to an idle pin of the second display screen interface 8, so that when no display screen is connected, the pin is set high by the internal pull-up resistor of the power supply; when a display screen is accessed, the ground signal on the screen puts the pin low, and the expected function is realized.
Specifically, the LVDS _ EN is used for enabling control over the protocol conversion chip, when the LVDS _ EN outputs a low level, the protocol conversion chip is in a reset state and does not work, and when the LVDS _ EN outputs a high level, the protocol conversion chip works normally.
Preferably, the MIPI controller 3 is connected to the protocol conversion chip 4 through a first data line, and the first data line is connected to a pin bifurcation of the protocol conversion chip and is connected to the first display interface 7 through a capacitor connected in series to be close to the pin. And the data transmitted by the first data line is converted by the protocol conversion chip and then output to a second display screen interface through a second data line. For example, the first data line may be a MIPI data line, and the second data line may be a LVDS data line.
It should be noted that, because of the high-speed characteristic of the MIPI signal, the present invention considers signal integrity, and because the MIPI display related signal cannot be directly connected to the first display interface 7 from the MIPI controller of the main control module 2 (but is connected to the first display interface 7 through the protocol conversion chip 4 in the middle), the signal quality is affected by the long bifurcation of the routing of the MIPI display channel (serious condition may cause the MIPI display screen to fail to display normally), so the MIPI signal needs to be connected to the first display interface 7 from the bifurcation of the pin of the protocol conversion chip 4 in series with a capacitor close to the pin, and is connected to the first display interface 7 through the capacitor.
Specifically, in order to ensure that the MIPI display screen and the LVDS display screen can work normally, the PCB layout wiring requirements of the single board design by adopting the design scheme are as follows: the fork of the MIPI signal is close to a bonding pad of the protocol conversion chip as much as possible, preferably the MIPI signal firstly passes through the bonding pad of the protocol conversion chip and then is extended to a capacitor as shown in the figure, and meanwhile, the capacitor at the position of the MIPI display channel is close to the protocol conversion chip as much as possible, so that redundant MIPI signal routing at the position of the MIPI screen when the LVDS display screen is adopted is reduced as much as possible, and the interference of a tail line to a high-speed MIPI signal is reduced.
In summary, the main control portion of the motherboard of the present invention is added with three signal lines, i.e., the first detection signal line LVDS _ DET, the first enable signal line Power _ EN, and the second enable signal line LVDS _ EN. The LVDS _ DET is an LVDS display screen (i.e., the first display screen) insertion detection signal with the backlight current of 200mA, the Power _ EN is a backlight Power enable control output signal, and the LVDS _ EN is a protocol conversion chip enable control signal. Through the three signal lines, the current value output of the backlight power supply can be controlled, and the corresponding display data channel and the corresponding display screen can be selected.
Further, in the display screen interface part and the display data channel part: the display screen interface part is simultaneously provided with a first display screen interface (such as an MIPI display screen interface) and a second display screen interface (such as an LVDS display screen interface); the invention is provided with an LVDS data channel and an MIPI data channel at the same time at the part of the display data channel. The MIPI display signal of the MIPI controller 3 is converted into an LVDS display signal by the protocol conversion chip 4, and is output to the second display screen interface (such as an LVDS display screen interface), and the second display screen interface is connected to the second display screen (such as an LVDS display screen).
Further, in the backlight power supply section: the invention adds an N-MOS tube Q1 on a channel of the original output current control first resistor R1, and controls the on-off of the current of the channel through the on-off of the DS pole of the MOS tube; meanwhile, another path of output current, a second resistor R2 channel and a corresponding control N-MOS tube Q2 are added. The G pole control signals of the two MOS tubes (Q1, Q2) are all from an enable signal Power _ EN of the master control output, and the Power _ EN drives the G pole of the second MOS tube Q2 and drives the G pole of the Q1 through an inverter.
Therefore, through the circuit design and the selection constraint on the PCB routing and devices of the circuit board, the first display screen interface (such as an MIPI display screen interface) and the second display screen interface (such as an LVDS display screen interface) are integrated on one hardware circuit board to be realized, the software and the hardware automatically identify the application scene of the equipment and control the gating backlight power supply and the data display channel, and one hardware circuit board can be simultaneously adapted to various application scenes, so that the hardware cost is effectively saved, and the hardware management and the maintenance are convenient.
Fig. 4 is a flowchart of a display screen circuit selection method provided by the present invention, as shown in the figure. A display screen circuit selection method is applied to a mainboard of intelligent networking equipment and comprises the following steps:
step 401, configuring a first display screen interface, a second display screen interface, a first backlight power circuit and a second backlight power circuit of an intelligent network interconnection device mainboard, wherein the backlight current of the first display screen interface is greater than the backlight current of the second display screen interface, the first backlight power circuit outputs the backlight current of the first display screen interface, and the second backlight power circuit outputs the backlight current of the second display screen interface.
Step 402, determining a display screen type connected with the main board of the intelligent networking device, wherein the display screen type comprises a display screen corresponding to the first display screen interface and a display screen corresponding to the second display screen interface.
Preferably, the determining the type of the display screen connected to the main board of the intelligent networking device includes: acquiring a detection signal of the second display screen interface through a first detection signal line of the intelligent network connection equipment mainboard; and controlling a protocol conversion chip of the intelligent network equipment mainboard to output display data to the corresponding first display screen interface or second display screen interface according to the detection signal.
Specifically, the first detection signal line LVDS _ DET is used to indicate whether the second display screen (for example, an LVDS display screen) is inserted into the second display screen interface. When a second display screen is inserted, the first detection signal line LVDS _ DET inputs a low level to the main control module; when the socket of the second display screen is empty, the first detection signal line LVDS _ DET inputs a high level to the main control module.
Specifically, the main control module controls the protocol conversion chip to output display data to the corresponding first display screen interface or the second display screen interface through a second enable signal line LVDS _ EN. The second enabling signal line LVDS _ EN is used for controlling enabling of the protocol conversion chip, and when the second enabling signal line LVDS _ EN outputs a low level, the protocol conversion chip is in a reset state and does not work; when LVDS _ EN outputs high level, the protocol conversion chip works normally.
Step 403, selecting a first backlight power supply circuit to supply power to the first display screen interface in the first display channel when the display screen type is the display screen corresponding to the first display screen interface.
And 404, selecting a second backlight power supply circuit to supply power to a second display screen interface in a second display channel under the condition that the display screen type is the display screen corresponding to the second display screen interface.
The above steps 403, 404 are described below.
Fig. 5 is a schematic flow chart of selecting the first display interface according to the present invention, as shown in the figure. In step 403, when the display screen type is the display screen corresponding to the first display screen interface, selecting the first backlight power supply circuit to supply power to the first display screen interface in the first display channel includes:
step 501, when the detection signal is at a high level, enabling the protocol conversion chip to set a second enabling signal of the motherboard of the intelligent networking device to be at a low level, and outputting display data to the first display screen interface through the protocol conversion chip.
Preferably, when the first detection signal line LVDS _ DET is at a high level, the main control module enables the protocol conversion chip to set the second enable signal LVDS _ EN to be at a low level, and the MIPI controller outputs display data to the first display screen interface through the protocol conversion chip by the first data line.
Step 502, when the detection signal is at a high level, a first enable signal enabling the motherboard of the intelligent networking device is at a high level, and the first backlight power circuit outputs a corresponding current value to the first display screen interface.
Preferably, when the first detection signal line LVDS _ DET is at a high level, the main control module enables the first enable signal Power _ EN to be at a high level, controls the first resistor R1 to open the current control channel and the second resistor R2 to close the current control channel, and the backlight Power source outputs a corresponding current value (for example, 300mA current) to the first display interface.
Fig. 6 is a schematic flow chart of selecting the second display interface provided by the present invention, as shown in the figure. In step 404, when the display screen type is a display screen corresponding to a second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel includes:
step 601, when the detection signal is at a low level, enabling the protocol conversion chip to set a second enabling signal of the main board of the intelligent networking device to be at a high level, and outputting display data to a second display screen interface through the protocol conversion chip.
Preferably, when the first detection signal line LVDS _ DET is at a low level, the main control module enables the protocol conversion chip to set the second enable signal LVDS _ EN at a high level, and the MIPI controller outputs display data to the second display screen interface through the protocol conversion chip by the second data line.
Step 602, when the detection signal is at a low level, enabling a first enable signal for enabling the motherboard of the intelligent networking device to be at a low level, and outputting a corresponding current value to a second display screen interface by the second backlight main power supply circuit.
Preferably, when the first detection signal line LVDS _ DET is at a low level, the main control module enables the first enable signal Power _ EN to be at a low level, controls the first resistor R1 to close and turn on the current control channel and controls the second resistor R2 to open the current control channel, and the backlight Power source outputs a corresponding current value (for example, 200mA current) to the second display interface.
In summary, the main control module controls the backlight main Power supply to output a corresponding current value to a corresponding display screen interface through a first enable signal line Power _ EN. When the first enable signal line Power _ EN is at a high level, the current control channel of the second resistor R2 is turned on and the current control channel of the first resistor R1 is turned off, and the backlight Power supply outputs a corresponding current value (e.g., 300mA current) to the first display interface (e.g., MIPI display interface); when the first enable signal line Power _ EN is at a low level, the first resistor R1 turns on the current control channel and the second resistor R2 turns off the current control channel, and the backlight Power source outputs a corresponding current value (e.g., 200mA current) to the second display interface (e.g., LVDS display interface).
It should be noted that, the first display interface and the second display interface are provided for interfaces of different display types, the present invention is not limited to the MIPI display interface or the LVDS display interface, and the current value controlled and output by the present invention is not limited to the 300mA current or the 200mA current, and may be specifically set according to the current value required by the actually inserted display.
Fig. 7 is a flowchart of a method for implementing a motherboard of an intelligent networking device according to an embodiment of the present invention, which is described by taking an MIPI display interface and an LVDS display interface as examples, and is shown in the figure.
Step 701, the system is powered on, and the program runs.
In step 702, the main control module determines whether the insertion detection signal transmitted from the socket of the LVDS display screen interface is at a low level. If the voltage level is high, go to step 703; if it is low, step 709 is performed.
And 703, connecting the intelligent network equipment mainboard to the MIPI through the MIPI display screen interface, wherein the backlight current value of the MIPI display screen is 300 mA.
Specifically, under the default of the system, when no LVDS display screen is accessed, the screen insertion detection signal Power _ DET outputs a high level signal to the main control module.
In step 704, the main control module sets the protocol conversion chip enable to the second enable signal line LVDS _ EN to a low level.
Step 705, the main control module outputs the MIPI display data to the MIPI display screen through the MIPI display screen interface.
In step 706, the main control module sets the enable signal of the first enable signal line Power _ EN to a high level.
In step 707, the main control module controls the first resistor R1 to turn off the current control channel and controls the second resistor R2 to turn on the current control channel.
And step 708, outputting 300mA current to the MIPI display screen interface by the backlight power supply chip.
And step 709, connecting the intelligent network equipment mainboard to the LVDS display screen through the LVDS display screen interface, wherein the backlight current value of the LVDS display screen is 200 mA.
Specifically, when the LVDS display interface detects that the LVDS display is inserted, the main control detects that the Power _ DET inputs a low level signal.
In step 710, the main control module enables the protocol conversion chip to set the second enable signal line LVDS _ EN to a high level.
In step 711, the main control module converts the MIPI display data into LVDS display data through the protocol conversion chip and outputs the LVDS display data to the LVDS display screen interface and outputs the LVDS display screen.
In step 712, the main control module sets the enable signal of the first enable signal line Power _ EN to a low level.
In step 713, the main control module controls the first resistor R1 to switch on the current control channel and the second resistor R2 to switch off the current control channel.
In step 714, the backlight power supply chip outputs 200mA current to the LVDS display interface.
In summary, the intelligent networking device motherboard of the present invention can be applied to a vehicle-mounted intelligent networking device motherboard, and the first detection signal line is used to detect whether LVDS display access exists:
under the default condition, when no LVDS display screen is accessed, the screen insertion detection signal Power _ DET outputs a high level signal to the main control processor. On one hand, the protocol conversion chip is enabled by the master control to set LVDS _ EN low, and MIPI display signals output by the master control directly reach an MIPI display screen data interface; on the other hand, the main control outputs a high level signal at the Power _ EN pin to control the disconnection of the R1 current channel and the conduction of the R2 current channel, so that the backlight Power supply outputs 300mA to supply Power to the MIPI display screen backlight.
When the LVDS display screen interface detects that the LVDS display screen is inserted, namely the main control detects that the Power _ DET inputs a low level signal. On one hand, the protocol conversion chip is enabled to be set to LVDS _ EN high by the master control, and MIPI display signals output by the master control are converted into LVDS display signals through the protocol conversion chip and are sent to an LVDS display screen data interface; on the other hand, the main control outputs a low level signal at the Power _ EN pin to control the R1 current channel to be conducted and the R2 current channel to be disconnected, so that the backlight Power supply outputs 200mA to supply Power to the LVDS display screen backlight.
The invention provides a display screen circuit selection method, which is applied to a mainboard of intelligent networking equipment and comprises the following steps:
configuring a first display screen interface, a second display screen interface, a first backlight power circuit and a second backlight power circuit of an intelligent network connection equipment mainboard, wherein the backlight current of the first display screen interface is larger than the backlight current of the second display screen interface, the first backlight power circuit outputs the backlight current of the first display screen interface, and the second backlight power circuit outputs the backlight current of the second display screen interface; determining the type of a display screen connected with the main board of the intelligent networking equipment, wherein the type of the display screen comprises a display screen corresponding to the first display screen interface and a display screen corresponding to the second display screen interface;
under the condition that the display screen type is the display screen corresponding to the first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel;
and under the condition that the display screen type is the display screen corresponding to the second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel.
The invention also provides a circuit, which comprises a main control module, a protocol conversion chip, a backlight power supply module and a display screen interface connected with the backlight power supply module, wherein the main control module is provided with an MIPI controller, the backlight power supply module comprises a first resistor,
the backlight power supply module further comprises a first circuit and a second circuit which are connected in parallel, the first circuit comprises a first MOS (metal oxide semiconductor) tube connected with the first resistor in series, the second circuit comprises a second MOS tube and a second resistor connected in series, and the main control module drives the second MOS tube through a first enabling signal line and drives the first MOS tube through a phase inverter;
the display screen interface comprises a first display screen interface and a second display screen interface, the MIPI controller is respectively connected with the first display screen interface and the second display screen interface through the protocol conversion chip, and the first display screen interface and the second display screen interface are both connected with the output end of the backlight power supply module;
the second display screen interface is connected with the main control module through a first detection signal line, and the main control module is connected with the protocol conversion chip through a second enabling signal line.
The circuit, the intelligent networking equipment mainboard and the implementation method of the intelligent networking equipment mainboard can be referred to correspondingly.
Fig. 8 illustrates a physical structure diagram of an electronic device, and as shown in fig. 8, the electronic device may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute a method for implementing the motherboard of the intelligent networking device, where the method includes:
the main control module acquires a detection signal of the second display screen interface through the first detection signal line;
and according to the detection signal, the main control module controls the protocol conversion chip to output display data to the corresponding first display screen interface or second display screen interface, and the backlight main power supply outputs a corresponding current value to the corresponding display screen interface.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the implementation method of the motherboard of an intelligent networking device provided by the above methods, and the method includes:
the main control module acquires a detection signal of the second display screen interface through the first detection signal line;
and according to the detection signal, the main control module controls the protocol conversion chip to output display data to the corresponding first display screen interface or second display screen interface, and the backlight main power supply outputs a corresponding current value to the corresponding display screen interface.
In another aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to execute the implementation method of the motherboard of an intelligent networking device provided in the foregoing aspects, and the method includes:
the main control module acquires a detection signal of the second display screen interface through the first detection signal line;
and according to the detection signal, the main control module controls the protocol conversion chip to output display data to the corresponding first display screen interface or second display screen interface, and the backlight main power supply outputs a corresponding current value to the corresponding display screen interface.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A display screen circuit selection method is applied to a mainboard of intelligent networking equipment and comprises the following steps:
configuring a first display screen interface, a second display screen interface, a first backlight power circuit and a second backlight power circuit of an intelligent network connection equipment mainboard, wherein the backlight current of the first display screen interface is larger than the backlight current of the second display screen interface, the first backlight power circuit outputs the backlight current of the first display screen interface, and the second backlight power circuit outputs the backlight current of the second display screen interface;
determining the type of a display screen connected with the main board of the intelligent networking equipment, wherein the type of the display screen comprises a display screen corresponding to the first display screen interface and a display screen corresponding to the second display screen interface;
under the condition that the display screen type is the display screen corresponding to the first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel;
and under the condition that the display screen type is the display screen corresponding to the second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel.
2. The method for selecting the display screen circuit according to claim 1, wherein the determining the type of the display screen connected to the main board of the intelligent networking device comprises:
acquiring a detection signal of the second display screen interface through a first detection signal line of the intelligent network connection equipment mainboard;
and controlling a protocol conversion chip of the intelligent network equipment mainboard to output display data to a corresponding first display screen interface or a corresponding second display screen interface according to the detection signal.
3. The method for selecting the display screen circuit according to claim 2, wherein when the display screen type is a display screen corresponding to a first display screen interface, selecting a first backlight power supply circuit to supply power to the first display screen interface in a first display channel includes:
when the detection signal is at a high level, enabling a second enabling signal of the protocol conversion chip, which is used for enabling the intelligent networking equipment mainboard, to be at a low level, and outputting display data to a first display screen interface through the protocol conversion chip;
when the detection signal is at a high level, a first enabling signal for enabling the intelligent network connection equipment mainboard is at a high level, and the first backlight power supply circuit outputs a corresponding current value to the first display screen interface.
4. The method for selecting the display screen circuit according to claim 2, wherein when the display screen type is a display screen corresponding to a second display screen interface, selecting a second backlight power supply circuit to supply power to the second display screen interface in a second display channel includes:
when the detection signal is at a low level, enabling a second enabling signal of the protocol conversion chip, which is used for enabling the intelligent network connection equipment mainboard, to be at a high level, and outputting display data to a second display screen interface through the protocol conversion chip;
when the detection signal is at a low level, a first enabling signal for enabling the intelligent network connection equipment mainboard is at a low level, and the second backlight main power supply circuit outputs a corresponding current value to the second display screen interface.
5. An intelligent network equipment mainboard, which comprises a main control module, a protocol conversion chip, a backlight power supply module and a display screen interface connected with the backlight power supply module, wherein the main control module is provided with a preset controller, the backlight power supply module comprises a first resistor, and the intelligent network equipment mainboard is characterized in that,
the backlight power supply module further comprises a first circuit and a second circuit which are connected in parallel, the first circuit comprises a first MOS (metal oxide semiconductor) tube connected with the first resistor in series, the second circuit comprises a second MOS tube and a second resistor connected in series, and the main control module drives the second MOS tube through a first enabling signal line and drives the first MOS tube through a phase inverter;
the display screen interface comprises a first display screen interface and a second display screen interface, the preset controller is respectively connected with the first display screen interface and the second display screen interface through the protocol conversion chip, and the first display screen interface and the second display screen interface are both connected with the output end of the backlight power supply module;
the second display screen interface is connected with the main control module through a first detection signal line, and the main control module is connected with the protocol conversion chip through a second enabling signal line.
6. The motherboard of claim 5, wherein the preset controller is connected to the protocol conversion chip via a first data line, the first data line is connected to a pin bifurcation of the protocol conversion chip and is connected to a first display interface via a capacitor connected in series to the pin, and data of the first data line is converted by the protocol conversion chip and then output to a second display interface via a second data line.
7. The motherboard of claim 5, wherein the first enable signal line is connected to the G-pole of the second MOS transistor, the D-pole of the second MOS transistor is connected to the second resistor, and the S-pole of the second MOS transistor is connected to the S-pole of the first MOS transistor.
8. The motherboard of claim 5, wherein the first enable signal line is connected to an input stage of the inverter, an output stage of the inverter is connected to a G pole of the first MOS transistor, and a D pole of the first MOS transistor is connected to a first resistor.
9. The motherboard of claim 5, wherein the backlight power module comprises a power input terminal, a backlight main power connected to the power input terminal, and an output terminal connected to the backlight main power, the backlight main power is connected to the first resistor, the first resistor is a regulating resistor for the output current of the backlight power module, and the first resistor and the second resistor are controlled by the first enable signal line to output corresponding current values.
10. An electronic device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, wherein said processor when executing said program performs the steps of the display screen circuit selection method according to any one of claims 1 to 4.
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