CN117496920A - High-brightness multimedia display device based on HDBASE-T multi-input - Google Patents
High-brightness multimedia display device based on HDBASE-T multi-input Download PDFInfo
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Abstract
The invention relates to the field of high-definition video transmission, in particular to a high-brightness multimedia display device based on HDBASE-T multi-input, which comprises a switch logic control board, a processor, an HDMI-LVDS conversion board, an environment control board, an LCD, a plurality of HDBASE-T video signal receiving boards, an environment control board and a power board; the HDBASE-T video signal receiving board is used for converting the HDBASE-T signal into an HDMI signal; the switch logic control board selects one path of HDMI signal from HDMI signals output by the plurality of HDMI-T video signal receiving boards and outputs the HDMI signal to the HDMI-LVDS conversion board; the HDMI-LVDS conversion board is used for converting received HDMI signals into LVDS signals and outputting the LVDS signals to the LCD, and the environment control board controls the voltage or current output by the power panel to the LCD according to the ambient light intensity to control the brightness of the LCD.
Description
Technical Field
The invention relates to the field of high-definition video transmission, in particular to a high-brightness multimedia display device based on HDBASE-T multi-input.
Background
HDMI lines are prominent in the audio/video field, and are also limited in distance during use. Typically, with 1080P signals, the transmission distance is about 20-40 meters furthest, and if further transmission is desired, the assistance of other devices is required.
Conventionally, the requirement of HDMI 2.0 transmission rate of 18Gbps is met, 30AWG can hardly exceed 5 m (degradation support 1080P is calculated), 28AWG does not exceed 8 m, 26AWG does not exceed 15 m, the coarsest 24AWG can only reach 20 m, and a chip is added to amplify signals more than 20 m.
Besides HDMI cable, there are many interfaces in audio/video field, listed below, for which transmission distance is not accurate, and needs to be considered according to practical situation.
(1) S terminal: 15 meters; (2) VGA: the transmission distance of the 3+4/6VGA is 15-30 meters; (3) DVI-I (integration): simultaneously receiving digital signals and analog signals, wherein the digital signals and the analog signals are 7-15 meters; (4) DisplayPort: the new version supports about 10 meters, and the active optical DP line can be up to more than 100 meters.
Disclosure of Invention
Aiming at the problem of long transmission distance of audio and video lines of the multimedia display equipment in the prior art, the high-brightness multimedia display equipment based on HDBASE-T multi-input is provided.
In order to achieve the above object, the present invention provides the following technical solutions:
an HDBASE-T multi-input based highlighting multimedia display device, comprising: the device comprises a switch logic control board, a processor, an HDMI-LVDS conversion board, an LCD, a plurality of HDBASE-T video signal receiving boards, an environment control board and a power board;
the HDBASE-T video signal receiving board is used for converting an HDBASE-T signal into an HDMI signal and outputting the HDMI signal to the switch logic control board;
the switch logic control board selects one path of HDMI signal from HDMI signals output by a plurality of HDMI-T video signal receiving boards according to the selection signal output by the processor and outputs the HDMI signal to the HDMI-LVDS conversion board;
the HDMI-LVDS conversion board is used for converting the received HDMI signal into an LVDS signal and outputting the LVDS signal to the LCD;
the processor is used for controlling the HDMI-LVDS conversion board to realize conversion from HDMI signals to LVDS signals; the processor also outputs a selection signal to the switch logic control board;
the environment control board is used for collecting and processing environment information, and the environment information comprises environment light intensity;
the environment control panel is connected with the power panel, and controls the voltage or current output to the LCD by the power panel according to the intensity of the environment light to control the brightness of the LCD;
the processor is also used for acquiring pose information from the environment control panel and adjusting the LCD to display as a horizontal screen or a vertical screen.
Preferably, the environment control board controls the voltage or current output by the power panel to the LCD in a PWM manner for adjusting the brightness of the LCD.
Preferably, the environment control board is further used for collecting equipment temperature information and adjusting the brightness of the LCD according to the equipment temperature information.
As a preferable scheme, the environmental control board adjusts the screen brightness through temperature and environmental light, and specifically comprises the following steps:
and correspondingly calculating an output digital signal value according to the NTC resistance value of the temperature sensor, and outputting a corresponding PWM value according to the digital signal value in a pre-stored corresponding table of the digital signal value, the PWM duty ratio and the screen brightness.
As a preferred solution, the correspondence between the pre-stored digital signal value, PWM duty cycle and screen brightness is:
when the sensor output value 60000 is equal to 100% of PWM duty ratio, the screen brightness is 2980nit;
when the sensor output value is 32000, the corresponding PWM duty ratio is 90%, and the screen brightness is 2675nit;
when the sensor outputs a value 16000, the corresponding PWM duty ratio is 80%, and the screen brightness is 2371nit;
when the output value of the sensor is 8000, the corresponding PWM duty ratio is 70%, and the screen brightness is 2060nit;
when the sensor output value is 4000, the corresponding PWM duty ratio is 60%, and the screen brightness is 1785nit;
when the sensor output value is 2000, the corresponding PWM duty ratio is 50%, and the screen brightness is 1430nit;
when the sensor output value is 1000, the corresponding PWM duty ratio is 40%, and the screen brightness is 1145nit;
when the sensor output value is 500, the corresponding PWM duty ratio is 30%, and the screen brightness is 850nit;
when the sensor output value is 300, the corresponding PWM duty ratio is 20%, and the screen brightness is 543nit;
when the sensor output value is 20, the corresponding PWM duty ratio is 10%, and the screen brightness is 285nit.
Preferably, the processor is further configured to obtain pose information from the environmental control panel and adjust the LCD to display as a landscape screen or a portrait screen, and includes the following steps:
the processor monitors the current vertical screen or horizontal screen state of the LCD in real time, and decodes the pose information into a horizontal screen decoding value or a vertical screen decoding value;
and if the screen is judged to be converted into the horizontal screen state or the vertical screen state, the processor writes the EDID of the screen parameter into the HDMI-LVDS conversion plate and resets the HDMI-LVDS chip.
As a preferred scheme, the environment control board further comprises a bluetooth module, wherein the bluetooth module is used for outputting equipment state information in real time so as to facilitate debugging and interaction.
Preferably, the HDBASE-T video signal receiving board adopts 2.0 protocol to support the transmission of 4K, USB, RS232 and audio.
Preferably, the LCD backlight part uses aluminum plate or heat conduction silicone grease to dissipate heat.
Preferably, the LCD backlight part also reserves a set of PWM speed-regulating fan interfaces supporting up to 40W.
Compared with the prior art, the invention has the following advantages and effects: long distance transmission, highlighting, real time monitoring and adjusting the landscape setting of the display device. And state information such as temperature, illumination intensity, brightness and the like of the display equipment can be monitored and adjusted in real time.
Drawings
FIG. 1 is a system block diagram of an HDBASE-T multi-input based highlighting multimedia display device in accordance with an embodiment 1;
FIG. 2 is a system frame diagram of an HDBASE-T multi-input based highlighting multimedia display apparatus according to embodiment 2;
fig. 3 is a flowchart of a method for adjusting screen brightness by temperature and ambient light in embodiment 2;
fig. 4 is a detailed system architecture diagram in example 2.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
An HDBASE-T multi-input based highlighting multimedia display device, a system block diagram of which is shown in fig. 1, comprising: the device comprises a switch logic control board, a processor, an HDMI-LVDS conversion board, an LCD and a plurality of HDBASE-T video signal receiving boards;
the HDBASE-T video signal receiving board is used for converting an HDBASE-T signal into an HDMI signal and outputting the HDMI signal to the switch logic control board; the switch logic control board selects one path of HDMI signal from HDMI signals output by a plurality of HDMI-T video signal receiving boards according to the selection signal output by the processor and outputs the HDMI signal to the HDMI-LVDS conversion board; the HDMI-LVDS conversion board is used for converting the received HDMI signal into an LVDS signal and outputting the LVDS signal to the LCD; the processor is used for controlling the HDMI-LVDS conversion board to realize conversion from HDMI signals to LVDS signals; the processor also outputs a selection signal to the switch logic control board.
The system also comprises an environment control board and a power panel, wherein the environment control board is used for collecting and processing environment information, and the environment information comprises environment light intensity; the environment control panel is connected with the power panel, and controls the voltage or current output to the LCD by the power panel according to the intensity of the environment light to control the brightness of the LCD; the processor is also used for acquiring pose information from the environment control panel and adjusting the LCD to display as a horizontal screen or a vertical screen.
Preferably, the environment control board controls the voltage or current output from the power panel to the LCD in a PWM manner.
Preferably, the processor is further configured to obtain pose information from the environmental control panel and adjust the LCD to display as a landscape screen or a portrait screen, and includes the following steps:
the processor monitors the current vertical screen or horizontal screen state of the LCD in real time, and decodes the pose information into a horizontal screen decoding value or a vertical screen decoding value;
and if the screen is judged to be converted into the horizontal screen state or the vertical screen state, the processor writes the EDID of the screen parameter into the HDMI-LVDS conversion plate and resets the HDMI-LVDS chip.
Preferably, the environment control board is further used for collecting equipment temperature information and adjusting the brightness of the LCD according to the equipment temperature information.
As a preferred scheme, the environment control panel further comprises a bluetooth module. The device is used for monitoring state information such as transverse and vertical screen setting, temperature, illumination intensity, brightness and the like of the HDBASE-T display equipment and carrying out remote data interaction, and particularly, the transverse and vertical screen state of the display can be adjusted remotely, and the brightness of the display equipment can be adjusted remotely.
Preferably, the HDBASE-T video signal receiving board adopts 2.0 protocol to support the transmission of 4K, USB, RS232 and audio.
Preferably, the LCD backlight part adopts aluminum plate and heat-conducting silicone grease, and the heat of the LCD backlight part causes the backboard.
Preferably, a fan for heat dissipation is further installed on the back plate to promote heat dissipation.
Example 2
A specific system frame diagram of a high-brightness multimedia display device based on HDBASE-T multi-input is shown in FIG. 2, which comprises an HDBASE-T video signal receiving Board, a Switch Board, an HDMI-LVDS conversion Board, an MCU, an environment control Board, an LCD (touch-sensitive LCD module), a power panel and the like.
The signal processing chip is VS2310RX, and has the main functions of converting the HDBASE-T signal processing into TMDS (HDMI) signals and analyzing signals such as USB, RS232, audio and the like. In the invention, only USB signals are used for data transmission.
The Switch Board has the main functions of performing logic control, HDMI_In1, USB_In1, HDMI_In2, USB_In2 and Select are used as input signals of the small Board, the Select is used for selecting which path the VIDEO signal comes from, if the level is 0, HDMI2:1 Switch and USB Switch are used as default first path input signals, namely (HDMI_In1 and USB_In1) and then output to (HDMI OUT and USB OUT), and the Select signal comes from the VIDEO Board. The HPD signal is not used for Select because in some cases all external interfaces are plugged into the device, but the content of the picture needs to be displayed, or the first path is preferentially displayed, and the CLK signal of HDMI needs to be detected for implementation; all signals from the outside have to be converted into HDMI signals before this. Because the data transmission is implemented by using RS232, the USB TO UART (XR 21V 1414) is used TO convert the USB signal into an RS232 serial signal. This is done to save costs. Data flow as in fig. 3:
the VIDEO Board comprises an HDMI-LVDS conversion Board and an MCU, and has the main functions of HDMI-LVDS and display control logic, the MCU receives an IR Data signal output by the environment control Board, the main function of switching a horizontal screen and a vertical screen according to the IR Data signal, and the MCU receives and also outputs a select signal to the Switch Board for selecting a signal source input to the LCD. The IR Data signal is received by the MCU (STM 8L101F3P 6), which processes the signal according to the coding rules, such as: the value decoded by the vertical screen is 0X10, and the screen is converted into the vertical screen after receiving the value. ACC Sensor is the attitude Sensor, mainly detects that present equipment is in vertical screen or horizontal screen state, if be in horizontal screen state at present, because the user demand needs to erect the screen at present, can directly rotate the screen, ACCSensor can trigger the signal, give MCU data, MCU can write the EDID of this screen parameter into HDMI-LVDS (LT 8619C) conversion chip again to reset HDMI-LVDS chip, this operation is that the screen is normally displayed under corresponding resolution. The HDMI-LVDS conversion chip converts the HDMI signal into LVDS, and currently, the use of an LVDS interface like a large-sized screen is the mainstream, and the cost performance is the highest.
The environment control panel has the main functions of collecting and processing environment information, and the IR Sensor, the Ambient Sensor and the NTC respectively collect client remote control information (information such as transverse and vertical screens, brightness and the like which are set by a client through a remote controller manually), environment light intensity information and equipment temperature information. A CYPRESS (CYBLE-014008-00) Bluetooth module is also mounted on the environment control panel, simple data processing can be carried out, a 32-bit processor is mounted, the module is responsible for processing environment light and temperature information, the environment light information mainly controls the screen brightness of a screen under different illumination intensities, the temperature information mainly is responsible for low-temperature slow-starting and high-temperature reducing the screen brightness, so that the power consumption is reduced to reduce the equipment temperature, the equipment temperature can be ensured to work in a normal working range, dimming is not only conventional dimming, but also has cold starting, thermal protection and fan action respectively, if the LED is started under the condition of extremely minus 30 ℃ in winter, normal LCD can not be displayed normally, but the customized LCD has high required brightness, so the LED designs the whole panel, the LED can gradually rise the internal temperature to the working condition due to self heating, the outdoor display characteristic in a particularly severe cold region is achieved, when the temperature is overhigh, the temperature is controlled to automatically dissipate heat, and the environment light intensity and the internal temperature of the system reach an equilibrium state. A flow chart of a method for adjusting the screen brightness through temperature and ambient light is shown in fig. 4, and specifically comprises the following steps:
after the MCU is initialized, whether information exists in the IR is firstly judged, if yes, whether brightness adjustment information exists is judged, if yes, whether the gear is added with 1 is judged, if yes, the current gear is added with 1, the current gear is obtained by looking up the table 2, the corresponding PWM value is output, and therefore the LCD module adjusts brightness according to the PWM value.
If the judgment of whether the gear is increased by 1 is no, the current gear is decreased by one, the table 2 is searched to obtain the current gear, and the corresponding PWM value is output, so that the LCD module adjusts the brightness according to the PWM value.
If the IR is judged to have no information, judging whether the temperature exceeds the limit, if yes, reducing the screen brightness, otherwise, acquiring the light sensation value of the ambient light sensor, regulating the screen brightness according to the ambient electroplating, and outputting a corresponding PWM value, so that the LCD module regulates the brightness according to the PWM value.
The graph is "judging IR presence information? The system is divided into two paths, namely an infrared IR signal and a system automatic adjusting signal, under the IR signal, the priority is highest, the horizontal and vertical screens and the brightness can be adjusted, when the brightness is adjusted, only the brightness is added and subtracted, otherwise, the system automatic adjusting is started after the IR adjustment is stopped. When the brightness is increased or decreased, firstly judging that the current temperature of the system is in an adjustable range (namely the brightness supported by the current temperature at the maximum), and then judging whether the received IR signal is increased or decreased by one grade, wherein the brightness corresponds to the 10 grade brightness of the table 2; the screen brightness and the fan speed can be automatically adjusted by the current temperature and the light sensation value in the automatic adjustment of the system, and 1% of steps can be achieved.
In addition, the system also comprises cold start and thermal protection, wherein after the system is initialized, the NTC knows that the current temperature meets the start condition, and then the screen backlight is turned on to slowly raise the temperature of the main board so as to meet the start condition; the thermal protection is to reduce the screen brightness when the system fan is insufficient to meet the heat dissipation requirement, and further reduce the heat productivity to meet the condition of normal operation of the system.
The bluetooth module may also send device status information in real time to a device manager or device developer for debugging and interaction. The CYBLE-014008-00 module processes the data of the Ambient Sensor and the NTC Sensor, and the brightness of the screen is controlled in a PWM mode through a control line connected with a power panel, the brightness of the screen is controlled in the PWM mode, the PWM which is relatively balanced in the current system is output through an internal balancing algorithm, and the PWM uses 20KHz which is commonly used. Table 1 shows the correspondence between the NTC resistance value and the AD value (AD value is the sensor output value of table 2): r is R 2 (25℃)=5000Ω，B(25/50℃)=3936K, B(25/85℃)=3977K, B(25/100℃)=3989Ω, R 1 =26.1KΩ。
In the above, R 2 The (25 ℃) is the resistance of NTC at 25 ℃, the B constant (25/50 ℃), the B constant (25/85 ℃), the B constant (25/100 ℃) which can be found in NTC specifications, R 1 Is a series voltage dividing resistor.
Table 1 shows the correspondence between NTC resistance and AD
Table 2: representing the relationship between the light sensation and the screen after test matching
As shown in FIG. 4, the system architecture diagram of the invention is matched with the highlighted 32 inch screen component, because the required brightness reaches 3000nit, the original factory screen backlight cannot meet the requirement, the backlight is changed by adding backlight lamp beads, the power reaches 138W, the generated heat is very high, the heat of the backlight part of the screen is dissipated by adding a large-area aluminum plate and matched with heat conduction silicone grease, the heat of the backlight part is led to the backboard, the auxiliary heat dissipation effect is achieved, and a fan interface with the maximum 40W is reserved for active heat dissipation. The test shows that the normal operation condition is reached.
In order to operate the high-power screen assembly, the VIDEO Board provides a VIDEO signal, the power panel provides a stable and reliable power supply system, the backlight voltage adopts a 24V power supply, the LCD screen uses a 12V power supply, the power panel is designed based on the power supply requirement, and backlight control, screen brightness and the like are all on the power panel, so that the normal operation of the screen assembly is ensured.
HDBASE-T employs the 2.0 protocol, supporting 4K, USB, RS232 and audio transmissions.
The distance can reach 100M, and the connection is convenient. HDMI-LVDS adapter plate and environmental panel carry out the control of whole screen, realize automatic light modulation, bluetooth, and automatically regulated temperature variation.
Finally, it should be noted that: the embodiments described in detail above are only for the preferred practice of the invention, and the scope of the claims of the invention should not be limited thereto, and the technical solutions described in the foregoing embodiments are equally substituted, so that the essence of the corresponding technical solutions does not deviate from the scope of the technical solutions of the embodiments of the invention, and all such embodiments are included in the scope of the claims and the specification of the invention.
Claims (10)
1. An HDBASE-T multi-input based highlighting multimedia display device, comprising: the device comprises a switch logic control board, a processor, an HDMI-LVDS conversion board, an LCD, a plurality of HDBASE-T video signal receiving boards, an environment control board and a power board;
the HDBASE-T video signal receiving board is used for converting an HDBASE-T signal into an HDMI signal and outputting the HDMI signal to the switch logic control board;
the switch logic control board selects one path of HDMI signal from HDMI signals output by a plurality of HDMI-T video signal receiving boards according to the selection signal output by the processor and outputs the HDMI signal to the HDMI-LVDS conversion board;
the HDMI-LVDS conversion board is used for converting the received HDMI signal into an LVDS signal and outputting the LVDS signal to the LCD;
the processor is used for controlling the HDMI-LVDS conversion board to realize conversion from HDMI signals to LVDS signals; the processor also outputs a selection signal to the switch logic control board;
the environment control board is used for collecting and processing environment information, and the environment information comprises environment light intensity;
the environment control panel is connected with the power panel, and controls the voltage or current output to the LCD by the power panel according to the intensity of the environment light to control the brightness of the LCD;
the processor is also used for acquiring pose information from the environment control panel and adjusting the LCD to display as a horizontal screen or a vertical screen.
2. An HDBASE-T multiple input based highlighting multimedia display apparatus as recited in claim 1, wherein the ambient control board PWM controls the voltage or current output from the power panel to the LCD for adjusting the brightness of the LCD.
3. An HDBASE-T multi-input based highlighting multimedia display device as recited in claim 2, wherein the environmental control panel is further configured to collect device temperature information and adjust the brightness of the LCD based on the device temperature information.
4. An HDBASE-T multi-input based highlighting multimedia display apparatus as recited in claim 3, wherein said ambient control board adjusts screen brightness by temperature and ambient light, comprising the steps of:
and correspondingly calculating an output digital signal value according to the NTC resistance value of the temperature sensor, and outputting a corresponding PWM value according to the digital signal value in a pre-stored corresponding table of the digital signal value, the PWM duty ratio and the screen brightness.
5. The HDBASE-T multi-input based highlighting multimedia display apparatus as recited in claim 4, wherein the pre-stored digital signal value, PWM duty cycle, and screen brightness correspondence is:
when the sensor output value 60000 is equal to 100% of PWM duty ratio, the screen brightness is 2980nit;
when the sensor output value is 32000, the corresponding PWM duty ratio is 90%, and the screen brightness is 2675nit;
when the sensor outputs a value 16000, the corresponding PWM duty ratio is 80%, and the screen brightness is 2371nit;
when the output value of the sensor is 8000, the corresponding PWM duty ratio is 70%, and the screen brightness is 2060nit;
when the sensor output value is 4000, the corresponding PWM duty ratio is 60%, and the screen brightness is 1785nit;
when the sensor output value is 2000, the corresponding PWM duty ratio is 50%, and the screen brightness is 1430nit;
when the sensor output value is 1000, the corresponding PWM duty ratio is 40%, and the screen brightness is 1145nit;
when the sensor output value is 500, the corresponding PWM duty ratio is 30%, and the screen brightness is 850nit;
when the sensor output value is 300, the corresponding PWM duty ratio is 20%, and the screen brightness is 543nit;
when the sensor output value is 20, the corresponding PWM duty ratio is 10%, and the screen brightness is 285nit.
6. The HDBASE-T multi-input based highlighting multimedia display device of claim 1, wherein the processor is further configured to obtain pose information from the environmental control panel and adjust the LCD display as a landscape or portrait screen, comprising the steps of:
the processor monitors the current vertical screen or horizontal screen state of the LCD in real time, and decodes the pose information into a horizontal screen decoding value or a vertical screen decoding value;
and if the screen is judged to be converted into the horizontal screen state or the vertical screen state, the processor writes the EDID of the screen parameter into the HDMI-LVDS conversion plate and resets the HDMI-LVDS chip.
7. The HDBASE-T multi-input based highlighting multimedia display device of claim 1, wherein the environmental control board further comprises a bluetooth module for outputting device status information in real time for debugging and interaction.
8. An HDBASE-T multi-input based highlighting multimedia display device as recited in claim 1, wherein the HDBASE-T video signal receiving board supports 4K, USB, RS232, and audio transmissions using 2.0 protocols.
9. An HDBASE-T multi-input based highlighting multimedia display apparatus as recited in any of claims 1-8, wherein the LCD backlight portion is heat-dissipating using aluminum plate or heat-conductive silicone grease.
10. An HDBASE-T multi-input based highlighting multimedia display device as recited in claim 9, wherein the LCD backlight section further reserves a set of PWM speed-regulated fan interfaces supporting a maximum of 40W.
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