CN214752886U - Display drive board - Google Patents
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- CN214752886U CN214752886U CN202023124285.XU CN202023124285U CN214752886U CN 214752886 U CN214752886 U CN 214752886U CN 202023124285 U CN202023124285 U CN 202023124285U CN 214752886 U CN214752886 U CN 214752886U
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Abstract
The utility model aims at providing a display drive plate includes: the video conversion circuit comprises a video conversion chip, a level conversion circuit, a protection circuit, a filter circuit, a power supply circuit and a liquid crystal display panel, wherein the input end of the protection circuit is connected with the analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the video conversion chip; the level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively; the power supply circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages; the liquid crystal display panel is connected with the video conversion chip and used for displaying the processed signals and realizing effective display of the signals processed by the video conversion chip.
Description
Technical Field
The utility model relates to a display field of computer especially relates to a display drive plate.
Background
In the prior art, a display only has a display function, and is applied to the fields of industry, rail transit and the like with higher requirements on system reliability. The system has a higher reliability requirement. The display generally serves as an interactive interface for the system with the user. In the state of the prior art, the display only executes the display function, and the system does not know the current state of the display, whether the display fails or not, the display effect and other information; when the display fails, the user disconnects from the system, resulting in a system failure. Moreover, the stability of the liquid crystal display is poor, and the anti-interference performance of the circuit is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a display drive board not only can improve the hardware stability of display, increase monitor function, can also make the wide and compatible many outputs of input signal scope.
According to an aspect of the present invention, there is provided a display driving board, wherein the display driving board includes: a video conversion chip, a level conversion circuit, a protection circuit, a filter circuit, a power circuit and a liquid crystal display panel, wherein,
the input end of the protection circuit is connected with the analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the video conversion chip;
the level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively;
the power circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages;
the liquid crystal display panel is connected with the video conversion chip and used for displaying the processed signals.
Furthermore, in the display driver board, the power circuit comprises multiple voltage outputs of 1.8V, 16V, 7V, -7V and 3.3V respectively,
the power circuit is connected with the video conversion chip and used for providing 3.3V voltage;
the power circuit is connected with the liquid crystal display panel and is used for providing voltages of 16V, 7V and-7V;
the power supply circuit is connected with the level conversion circuit and used for providing 1.8V voltage.
Further, in the above display driver board, the digital interface includes a high definition multimedia interface HDMI, the first level shifter circuit includes a first level shifter chip,
the input end of the first level conversion chip is connected with the HDMI, and the output end of the level conversion chip is connected with the video conversion chip, and is used for converting the transition modulation differential signal TMDS of the HDMI into a level signal of color 24-bit video data RGB24-bit, and inputting the level signal into the video conversion chip.
Further, in the above display driving board, the second level shifter circuit includes a second level shifter chip,
the input end of the second level conversion chip is connected with the PC, and the output end of the second level conversion chip is connected with the video conversion chip through an asynchronous transmission standard interface RS232, and is used for converting a transistor TTL signal of the PC into a signal supporting RS232 serial port communication and inputting the signal into the video conversion chip.
Further, in the display driver board, the protection circuit includes an ESD protection chip for implementing ± 15kV ESD protection.
Further, in the above display driver board, the filter circuit includes a capacitor and a resistor connected in parallel, where the capacitor is 22pF, and the resistor is 75R, and is configured to filter a signal output by the protection circuit.
Further, in the above display driving board, the video conversion chip includes a TW8836 single chip, wherein the TW8836 single chip includes a clock system,
the clock system comprises a first video clock phase-locked loop, a second video clock phase-locked loop and a single chip microcomputer clock, wherein the single chip microcomputer clock comprises a Micro Control Unit (MCU) and a nonvolatile memory (FLASH), and the nonvolatile memory (FLASH) is provided with an internal memory for storing fault related information;
the first video clock phase-locked loop and the second video clock phase-locked loop are used for providing clock sources for video sampling, conversion and scaling output, the first video clock phase-locked loop is set to be 54MHz, the second video clock phase-locked loop is set to be 108MHz, and the first video clock phase-locked loop and the second video clock phase-locked loop are used for realizing video output of input of 640x480/60Hz resolution to 1366x 768/60Hz resolution and output of 720P resolution.
Further, in the above display driver board, the video conversion chip is further configured to detect a minimum clock of a signal input from the analog interface, and adjust a phase-locked loop in the video conversion chip, so that the clock signal and the video input signal have the same frequency, thereby achieving optimal sampling.
Further, in the display driver board, the video conversion chip is further configured to perform filtering processing on a signal input by the analog interface.
Further, in the display driver board, the video conversion chip is further configured to perform stability monitoring on a signal input by the digital interface.
Further, in the above display driver board, the video conversion chip is further configured to adjust a color gain of the video signal.
Further, in the display driver board, the video conversion chip is further configured to detect an input signal in real time, and switch a channel or shut down the display when a current channel is abnormal or an effective signal exists in another channel.
Further, in the display driver board, the video conversion chip is further configured to report the device display state of the liquid crystal display panel to the PC through the asynchronous transmission standard interface RS232 based on a preset time interval, and meanwhile, obtain an upper computer state of the PC.
Further, in the display driver board, if the communication between the PC and the video conversion chip fails, the video conversion chip controls to close the video link of the liquid crystal display panel, and actively displays the failure prompt information pre-stored in the liquid crystal display panel.
Compared with the prior art, the utility model provides a pair of display drive plate includes: the protection circuit comprises a video conversion chip, a level conversion circuit, a protection circuit, a filter circuit, a power supply circuit and a liquid crystal display panel, wherein the input end of the protection circuit is connected with an analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the video conversion chip so as to realize protection and filter processing of signals input by the analog interface, thereby improving the reliability of hardware signals and better protecting a board card; the level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively, so that the level of a signal input by the digital interface can be matched with the level in the video conversion chip and the level of a signal input by the PC can be matched with the level in the video conversion chip, and the level conversion circuit can be in better communication with the video conversion chip; the power supply circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages so as to ensure the plurality of paths of outputs; the liquid crystal display panel is connected with the video conversion chip and used for displaying the processed signals and realizing effective display of the signals processed by the video conversion chip.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 illustrates a circuit schematic diagram of a display driver board according to an aspect of the present invention;
fig. 2 illustrates a hardware block diagram of a video conversion chip in a display driver board according to an aspect of the present invention;
fig. 3 shows a schematic diagram of a protection circuit in a display driver board according to an aspect of the present invention;
fig. 4 shows a schematic diagram of a filter circuit in a display driver board according to an aspect of the present invention;
FIG. 5 illustrates a master function flow diagram corresponding to a program master architecture in a display driver board, according to an aspect of the present invention;
fig. 6 illustrates a software architecture diagram corresponding to a program body architecture in a display driver board according to an aspect of the present invention;
fig. 7 shows a circuit diagram of a clock system in a TW8836 single chip in a video conversion chip in a display driver board according to an aspect of the present invention;
fig. 8 illustrates a schematic diagram of full screen scaling by a clock system in a display driver board according to an aspect of the present invention;
fig. 9 illustrates a schematic diagram of a reduction scaling by a clock system in a display driver board according to an aspect of the present invention;
fig. 10 illustrates an enlarged scaling schematic diagram of a clock system in a display driver board according to an aspect of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The following examples are only preferred embodiments of the present application, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.
As shown in fig. 1, the present invention provides a display driving board, wherein the display driving board includes: the liquid crystal display panel can support a display panel of two liquid crystals, namely Transistor-Transistor Logic (TTL) and Low-Voltage Differential Signaling (LVDS), and support two input signals, namely Video Graphics Array (VGA) and LVDS, and the resolution of the input signals is supported to be at least 720P; here, the video conversion chip includes a TW8836 single chip, and a specific hardware block diagram is shown in fig. 2.
The input end of the protection circuit is connected with the analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the video conversion chip, and therefore protection and filtering processing of signals input by the analog interface are achieved, and therefore reliability of hardware signals is improved and better protection is conducted on a board card device. Here, the analog interface may include, but is not limited to, VGA and S-VIDEO support, among others.
The level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively, so that the level of a signal input by the digital interface can be matched with the level in the video conversion chip and the level of a signal input by the PC can be matched with the level in the video conversion chip, and the level conversion circuit can be in better communication with the video conversion chip; herein, the digital interface may include, but is not limited to, support for LVDS, HDMI, and RGB24 bit.
The power supply circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages so as to ensure the plurality of paths of outputs; the liquid crystal display panel is connected with the video conversion chip and used for displaying the processed signals and realizing effective display of the signals processed by the video conversion chip.
Further, an embodiment of the utility model provides an among the display drive board, power supply circuit is compatible multiple LCD screen, power supply circuit includes multichannel voltage output, divide into BUCK topology voltage output, and the voltage has 1.8V, 3.3V and 5V etc. to and BOOST topology circuit output, and the voltage has 16V, reverse voltage-7V etc. and wherein, the electric current of current source is 200 mA. The power circuit is connected with the video conversion chip and used for providing 3.3V voltage for the video conversion chip; the power supply circuit is connected with the liquid crystal display panel and is used for supplying 16V, 7V and-7V voltage to the liquid crystal display panel; the power supply circuit is connected with the level conversion circuit and used for providing 1.8V voltage for the level conversion circuit.
Further, an embodiment of the present invention provides a display driving board, wherein the digital interface includes a high definition multimedia interface HDMI, the first level shifter circuit includes a first level shifter chip, and the first level shifter chip includes, but is not limited to, a TFP401APZP level shifter chip, and the like.
In order to better be compatible with signals input by a high-definition multimedia interface HDMI, a first level conversion chip, such as a TFP401APZP level conversion chip, is added, so that an input end of the first level conversion chip is connected with the HDMI, an output end of the level conversion chip is connected with the video conversion chip, and the first level conversion chip is used for converting Transition-minimized differential signaling (TMDS) of the HDMI into a level signal of 24-bit color video data RGB24-bit, and inputting the level signal into the video conversion chip, so as to match the level of the signals input by the HDMI with the level in the video conversion chip, and ensure better communication between the signals.
Further, in an embodiment of the present invention, in a display driver board, the second level shift circuit includes a second level shift chip, and the second level shift chip includes, but is not limited to, a MAX3232EIPW level shift chip, and in a preferred embodiment of the present invention, the second level shift chip is preferably a MAX3232EIPW level shift chip, which is only exemplified by the preferred embodiment.
In order to better perform compatibility on input signals of a PC, a second level conversion chip is added, for example, a MAX3232EIPW level conversion chip, an input end of the second level conversion chip is connected with the PC, an output end of the second level conversion chip is connected with the video conversion chip through an asynchronous transmission standard interface RS232, the second level conversion chip is used for converting signals of a transistor TTL of the PC into signals supporting RS232 serial port communication, and the signals are input into the video conversion chip, so that level conversion between the transistor TTL of the PC and the video conversion chip is realized, and better communication between the transistor TTL of the PC and the video conversion chip can be realized.
In order to consider the reliability of hardware, an embodiment of the present invention provides a display driving board, wherein a protection circuit is additionally added to a signal, wherein the protection circuit is connected to an analog interface to protect an input analog signal, the protection circuit includes an ESD protection chip for implementing ± 15kV ESD protection, wherein the ESD protection chip includes but is not limited to a TPD3E001 ESD protection chip, and in a preferred embodiment of the present invention, the ESD protection chip is preferably a TPD3E001 ESD protection chip, which is only exemplified as a preferred embodiment, as shown in fig. 3, a corresponding circuit diagram when the ESD protection chip in the protection circuit is preferably a TPD3E001 ESD protection chip.
Further, an embodiment of the utility model provides an in a display drive board, increase filter circuit, filter circuit's input with protection circuit's output is connected, filter circuit is including parallelly connected electric capacity and resistance, as shown in fig. 4, electric capacity is 22pF, resistance is 75R, is used for right the signal of protection circuit output carries out filtering process, so that input extremely signal in the video conversion chip is through filtering process to realize carrying out the filtering process after the protection to the analog signal of analog interface input, thereby improve hardware signal reliability and carry out better protection to the integrated circuit board ware.
An embodiment of the utility model provides an among the display drive board for the program main part framework that controls the display drive board uses the state machine to realize, and wherein, specifically the master function flow chart is shown in fig. 5, and software architecture is shown in fig. 6 correspondingly.
Further, an embodiment of the present invention provides a display driving board, wherein the video conversion chip includes a TW8836 single chip microcomputer, wherein the TW8836 single chip microcomputer includes a clock system, as shown in fig. 7, the clock system includes a first video clock phase-locked loop SSPLL1, a second video clock phase-locked loop SSPLL2 and a single chip clock MCUCLK, the single chip clock MCUCLK includes a Micro Control Unit (MCU) and a non-volatile memory FLASH, wherein the non-volatile memory FLASH has a memory for storing fault-related information, wherein the fault-related information includes, but is not limited to, fault condition information, fault prompt information, and the like; the first video clock phase-locked loop SSPLL1 and the second video clock phase-locked loop SSPLL2 are used for providing clock sources for video sampling, conversion and scaling output, the first video clock phase-locked loop is set to 54MHz, the second video clock phase-locked loop is set to 108MHz, and the first video clock phase-locked loop and the second video clock phase-locked loop are used for realizing video output of input with the resolution of 640x480/60Hz to 1366x 768/60Hz and output of 720P. For example, when 640x480/60hz total pixels, the row signal: 64 (hidden signal) +640 (active) +96 (line sync signal) ═ 800 (total), field signal: 43 (hidden signal) +480 (active) +2 (field sync signal) ═ 525 (total), total clock signal: row field refresh rate (1 second frames) is the total clock frequency, i.e. 800 field 525 field 60 25200000 field 25.2M, much less than 54Mhz, thus supporting a corresponding 640x480/60hz video output; as another example, when 1366 × 768/60hz total pixels, the row signals total: 1366 (active) +143 (sync) +283 (hidden signal) ═ 1792, the field signals total: 768 (active) +3 (sync) +27 (blanking) ═ 798, frequency: 1792 798 60 85800960 Mhz is less than 108Mhz, so it can also support 1366 768/60hz video output. In the clock system, when the input signal and the liquid crystal display panel are not matched, the input signal may be scaled by the clock system, for example, when the aspect ratio is different, the scaling effect may be selected, such as full screen scaling shown in fig. 8, restoration scaling shown in fig. 9, and enlargement scaling shown in fig. 10, so as to satisfy different video outputs corresponding to different signal inputs.
Aiming at the condition that the input signal is not matched with the liquid crystal panel, the zooming function is realized, and the zooming effect can be selected when the aspect ratio is different. And zooming in and out after full screen zooming, restoring zooming and amplifying zooming.
Further, an embodiment of the utility model provides an among the display drive plate, the video conversion chip still is used for detecting the follow the minimum clock of the signal of analog interface input adjusts phase-locked loop in the video conversion chip to make clock signal and video input signal with the frequency, in order to realize best sampling, realized carrying out automatically regulated sampling frequency to analog signal, with the precision that improves analog signal.
Further, an embodiment of the present invention provides a display driver board, the video conversion chip is further used for right the signal of analog interface input is filtered, and the analog signal of analog interface input is filtered, so that the inside of the video conversion chip supports the filtering of analog signal (for example, VGA).
Further, an embodiment of the utility model provides an among the display drive plate, the video conversion chip still be used for right the signal of digital interface input carries out stability monitoring, for example, software in the video conversion chip can judge digital signal in real time, and when digital signal falls off the line, clock frequency is not to the time, can do the digital signal and judge and shut down etc. and handle to reach the purpose of carrying out stability monitoring to digital signal.
Further, an embodiment of the present invention provides a display driving board, wherein the video conversion chip is further used for adjusting the color gain of the video signal, for example, the software in the video conversion chip can adjust the color contrast and color calibration, etc. to achieve the purpose of adjusting the color gain of the video signal.
Further, an embodiment of the present invention provides a display drive board, the video conversion chip is further used for detecting the input signal in real time, and when the current channel is abnormal or other channels have effective signals, the channel is switched or the power is turned off.
Further, an embodiment of the utility model provides an among the display drive plate, the video conversion chip still is arranged in based on presetting time interval, through asynchronous transmission standard interface RS232, to the PC reports liquid crystal display panel's equipment display state, simultaneously, acquires the host computer state of PC. Here, the preset time interval includes, but is not limited to, 100ms, 50ms, 200ms, and the like, in a preferred embodiment of the present invention, the preset time interval is preferably 100ms, for example, software in the video conversion chip communicates with the PC once through RS232 based on 100ms, reports the device display state of the liquid crystal display panel, and reads information such as the upper computer state of the PC, so as to implement bidirectional communication between the PC and the liquid crystal display panel.
Further, an embodiment of the present invention provides a display drive board, if the PC with when communication between the video conversion chip failed, video conversion chip control closes the video link of liquid crystal display panel, active display simultaneously the trouble suggestion information that liquid crystal display panel prestored, here, the trouble suggestion information includes but not limited to picture, character information etc. for example, signal failure, the information that is used for trouble suggestion such as maintenance. Key information in a control system in the video conversion chip, such as main equipment of an industrial personal computer, a motor and the like, is acquired through the industrial personal computer and stored in the FLASH.
To sum up, the utility model provides a display drive plate includes: the protection circuit comprises a video conversion chip, a level conversion circuit, a protection circuit, a filter circuit, a power supply circuit and a liquid crystal display panel, wherein the input end of the protection circuit is connected with an analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the video conversion chip so as to realize protection and filter processing of signals input by the analog interface, thereby improving the reliability of hardware signals and better protecting a board card; the level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively, so that the level of a signal input by the digital interface can be matched with the level in the video conversion chip and the level of a signal input by the PC can be matched with the level in the video conversion chip, and the level conversion circuit can be in better communication with the video conversion chip; the power supply circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages so as to ensure the plurality of paths of outputs; the liquid crystal display panel is connected with the video conversion chip and used for displaying the processed signals and realizing effective display of the signals processed by the video conversion chip.
Further, the utility model discloses an application relates to the track traffic field, synthesizes power electronics, monitored control system, the technique that combines such as single chip microcomputer control, mainly solves, servo driver performance problem. The liquid crystal display module is brought into a state monitoring range, and the system reliability is improved. And meanwhile, the display also records the working state of the system, and stores the record and displays.
It will, of course, be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. A display driving board, wherein the display driving board comprises: a video conversion chip, a level conversion circuit, a protection circuit, a filter circuit, a power circuit and a liquid crystal display panel, wherein,
the input end of the protection circuit is connected with the analog interface, the output end of the protection circuit is connected with the input end of the protection circuit, the output end of the protection circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the video conversion chip;
the level conversion circuit comprises a first level conversion circuit connected with the digital interface and the video conversion chip respectively and a second level conversion circuit connected with the PC and the video conversion chip respectively;
the power circuit comprises a plurality of paths of voltage outputs which are respectively connected with the video conversion chip, the liquid crystal display panel and the level conversion circuit and used for providing different voltages;
the liquid crystal display panel is connected with the video conversion chip.
2. A display driver board according to claim 1 wherein the power supply circuit comprises multiple voltage outputs, 1.8V, 16V, 7V, -7V and 3.3V respectively,
the power circuit is connected with the video conversion chip and used for providing 3.3V voltage;
the power circuit is connected with the liquid crystal display panel and is used for providing voltages of 16V, 7V and-7V;
the power supply circuit is connected with the level conversion circuit and used for providing 1.8V voltage.
3. The display driver board of claim 1, wherein the digital interface comprises a High Definition Multimedia Interface (HDMI), the first level shifting circuit comprises a first level shifting chip,
the input end of the first level conversion chip is connected with the HDMI, and the output end of the level conversion chip is connected with the video conversion chip.
4. The display driving board according to claim 1, wherein the second level shifter circuit comprises a second level shifter chip,
the input end of the second level conversion chip is connected with the PC, and the output end of the second level conversion chip is connected with the video conversion chip through an asynchronous transmission standard interface RS 232.
5. A display driver board according to claim 1, wherein the protection circuit comprises an electrostatic discharge ESD protection chip for achieving ± 15kV ESD protection.
6. The display driver board of claim 1, wherein the filter circuit comprises a capacitor and a resistor in parallel, wherein the capacitor is 22pF and the resistor is 75R.
7. The display driver board of any of claims 1-6, wherein the video conversion chip comprises a TW8836 singlechip, wherein the TW8836 singlechip comprises a clock system,
the clock system comprises a first video clock phase-locked loop, a second video clock phase-locked loop and a single chip microcomputer clock, wherein the single chip microcomputer clock comprises a Micro Control Unit (MCU) and a nonvolatile memory (FLASH), and the nonvolatile memory (FLASH) is provided with an internal memory;
the first video clock phase-locked loop and the second video clock phase-locked loop are used for providing clock sources for video sampling, conversion and scaling output, the first video clock phase-locked loop is set to be 54MHz, and the second video clock phase-locked loop is set to be 108 MHz.
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| CN202023124285.XU CN214752886U (en) | 2020-12-22 | 2020-12-22 | Display drive board |
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| CN202023124285.XU CN214752886U (en) | 2020-12-22 | 2020-12-22 | Display drive board |
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