CN207558328U - A kind of TFT liquid crystal serial ports display - Google Patents
A kind of TFT liquid crystal serial ports display Download PDFInfo
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- CN207558328U CN207558328U CN201721861803.1U CN201721861803U CN207558328U CN 207558328 U CN207558328 U CN 207558328U CN 201721861803 U CN201721861803 U CN 201721861803U CN 207558328 U CN207558328 U CN 207558328U
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- liquid crystal
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Abstract
The utility model is related to a kind of industrial liquid crystal screen displays.A kind of TFT liquid crystal serial ports display,Including power management module,Nand memory,SDRAM/SRAM display caching memories,Keyboard and TFT LCD,The microprocessor circuit of the TFT liquid crystal serial ports display uses LPC1788/LPC4357 processors,External power supply connects power management module and backlight pwm control circuit respectively by capacitor filtering and anti-interference process circuit,Power management module output power supply accesses LPC1788/LPC4357 processors,The backlight of the output connection TFT LCD of backlight pwm control circuit,The communication interface circuit being connect with the serial communication of LPC1788/LPC4357 processors is communicated including RS485,RS232 is communicated,CAN bus and USB interface.System is succinctly reliable, and hardware cost is low, reduces hazard rate, safeguards simple and practicable.
Description
Technical field
The utility model is related to a kind of industrial liquid crystal screen displays, and LPC1788 microprocessors are based on more particularly, to one kind
TFT liquid crystal serial ports displays.
Background technology
At present, serial ports screen LCD industry, usually with CPLD（FPGA）For core, the CPU for being aided with periphery is carried out
Hardware design, user interface is excessively single, and hardware cost is high, maintainable poor.
Invention content
The utility model provides a kind of serial ports display based on LPC1788 processors, passes through in hardware design
LPC1788 and external SDRAM/SRAM, NAND FLASH, microprocessor monitors circuit etc. are coordinated, realization signal processing,
Data store and to LCD backlight, LCD is shown, RS485 is communicated, RS232 is communicated, CAN bus, all peripheral hardwares such as USB interface
Control work.System is more succinct reliable, reduces hardware cost, reduces hazard rate, safeguards simple and practicable.
Technical solution used by the utility model：
A kind of TFT liquid crystal serial ports display, including power management module（3）, nand memory（8）, SDRAM/SRAM shows
Show buffer memory（4）, keyboard（6）And TFT-LCD（5）, the microprocessor circuit use of the TFT liquid crystal serial ports display
LPC1788/LPC4357 processors, external power supply pass through capacitor filtering and anti-interference process circuit（1）Power management is connected respectively
Module（3）With backlight pwm control circuit（2）, power management module（3）At output power supply access LPC1788/LPC4357
Manage device, backlight pwm control circuit（2）Output connection TFT-LCD（5）Backlight, with the LPC1788/LPC4357 processing
The communication interface circuit of the serial communication connection of device（9）Including RS485 communications, RS232 communications, CAN bus and USB interface.
The TFT liquid crystal serial ports displays, external power supply use the DC power supply of 8~24V, power management module（3）
The high voltage of input is converted to by 5V DC voltages using power conversion chip, the master control voltage of microprocessor circuit is provided, then
5V DC voltages are converted into 3.3V as CPU core voltage through LDO, then by positive/negative-pressure circuit conversion be TFT-LCD（5）It is required
Positive/negative-pressure；The power conversion chip uses LM2596, designs compatible MIC4576 or TD7590 chips.
The backlight pwm control circuit uses the LED constant current driving chip XL6004 of Shanghai Xin Long semiconductor companies as core
The heart, the LED constant current driving chip XL6004 are inputted with 3.6~36V Width funtions, the high-power output of 3A.
The TFT liquid crystal serial ports displays, usb circuit include usb host or USB slave interfaces, host interface
Picture is transmitted with USB flash disk, the control and alarm to VBUS electric currents are realized by using LM3526-L；USB slave interfaces pass through
Computer USB download transmission picture.
The TFT liquid crystal serial ports displays, interfere to avoid, increase on DP, DM data line of usb circuit
TVS is protected, and TVS selects PRTR5V0U2X.
The beneficial effects of the utility model：
1st, the utility model TFT liquid crystal serial ports display, peripheral interface circuit include RS485 communications, RS232 communications, CAN
Bus and USB interface, hardware interface is complete, can pass through usb host（Or USB slaves apolegamy）/ USB flash disk, TF card, serial port configuration
The display is downloaded in preset picture to the display, fully achieves the work(of serial ports display that liquid crystal display industry uses
Energy.
2nd, the utility model TFT liquid crystal serial ports display, using LPC1788/LPC4357 as core, technical grade chip height,
It is the operation is stable under low temperature condition, reliable, coordinate corresponding electric power management circuit and interface circuit, it can be in wider DC voltage
In the range of work, be completely suitable for industrial occasions.System is succinctly reliable, and hardware cost is low, reduces hazard rate, safeguards letter
It is single easy.
Description of the drawings
Fig. 1 is the principle schematic of the utility model TFT liquid crystal serial ports displays；
Fig. 2 is the backlight pwm control circuit principle schematic of the utility model TFT liquid crystal serial ports displays.
Specific embodiment
Below by specific embodiment, the technical solution of the utility model is described in further detail.
Embodiment 1
Referring to Fig. 1, the utility model TFT liquid crystal serial ports displays, including power management module 3, nand memory 8,
SDRAM/SRAM display cachings memory 4, keyboard 6 and TFT-LCD 5, the microprocessor of the TFT liquid crystal serial ports display
Circuit 7 uses LPC1788/LPC4357 processors, and external power supply is connected respectively by capacitor filtering and anti-interference process circuit 1
Power management module 3 and backlight pwm control circuit 2,3 output power supply of power management module access LPC1788/LPC4357
Processor, the backlight of the output connection TFT-LCD5 of backlight pwm control circuit 2, with the LPC1788/LPC4357 processors
The communication interface circuit 9 of serial communication connection include RS485 communications, RS232 communications, CAN bus and USB interface.
Microprocessor is used using the LPC1788/LPC4357 of the ARM Cortex-M3 of grace intelligence Pu semiconductor N XP
The NAND FLASH memory spaces of 32MB SDRAM, 128MB, can prestore 255 width pictures, full frame and local bitmap, self-defined word
Library, interface configuration file, preset tri- kinds of dot matrix GB2312 Song typeface character libraries of 16*16,24*24,32*32,8*16,12*24,
Tri- kinds of ASCII character libraries of 16*32 can support up to 10 kinds of User Defined character libraries；Abundant api function, built-in text are provided
The common controls such as frame, button, instrument board, block diagram, curve graph, GIF animations.
The utility model supports 3*4 matrix press-keys or 7 Independent keys, keypress function can customize；Support 4 lines or 5 lines
Resistive touch screen, human-computer interaction are friendly.
Embodiment 2
Referring to Fig. 1, the TFT liquid crystal serial ports displays of the present embodiment, with embodiment 1 the difference lies in：External power supply
Using the DC power supply of 8~24V, power management module 3 is using power conversion chip LM2596-5.0（The compatible MIC4576 of design
Or TD7590 chips）The high voltage of input is converted into 5V DC voltages, the master control voltage of microprocessor circuit is provided, then is passed through
5V DC voltages are converted to 3.3V as CPU core voltage by LDO, then as positive/negative-pressure circuit conversion needed for TFT-LCD 5
Positive/negative-pressure.
Power input terminal keeps the interface of Products using KF2EDGR3.81-3.81 band ear inverse plugging formula designs
Consistency, and fully ensured that the reliability of power connection, support the input of direct current Width funtion：DC supply input range 8V-
24V。
Embodiment 3
Referring to Fig. 1, Fig. 2, the TFT liquid crystal serial ports displays of the present embodiment, with embodiment 1 or the difference of embodiment 2
It is：The backlight pwm control circuit, core is mainly by U8（Using the LED constant current driving chip of Shanghai Xin Long semiconductor companies
XL6004）Constant current source chip is formed, and the 4th foot of U8 is power input foot, and the 3rd foot is switch output pin, and the 5th foot is sampling feedback
Foot, the 2nd foot are enabled foot.Shake inductance based on L3, and D9 is rectifier diode, and CB2 is storage capacitor, R93, R96 and RB1 or RB2
Sample circuit is purchased into, sampled point gives the 5th foot of U8 after CB4 is filtered, and D8 left ends can receive pwm signal and carry out stepless dimming.
Change the value of RB1 or RB2, the demand of the LED liquid crystal display backlight drives of 15 cun and less than 15 cun sizes can be met.The LED
Constant-current driven chip XL6004 is inputted with 3.6~36V Width funtions, the high-power output of 3A.
Embodiment 4
Referring to Fig. 1, Fig. 2, the TFT liquid crystal serial ports displays of the present embodiment, unlike foregoing embodiments：USB connects
Mouth circuit includes usb host or USB slave interfaces, host interface are transmitted picture with USB flash disk, are realized by using LM3526-L
Control and alarm to VBUS electric currents；USB slaves interface passes through computer USB download transmission picture.
The serial ports display externally provides a usb host or slave interface, when with host interface, can use USB flash disk into
Row transmission picture, the control and alarm to VBUS electric currents are realized by using LM3526-L；It, can be with electricity consumption when with slave interface
Brain USB is to its download transmission picture engineering.
In order to avoid the interference summarized to USB, increase TVS protections, this reality on DP, DM data line of usb circuit
It applies TVS in example and selects PRTR5V0U2X.
The utility model serial ports display using LPC1788/LPC4357 as core, can select RS485 communications, RS232
Any one interface mode and computer communication, touch screen in communication, CAN bus, USB interface（It is pasted onto on TFT liquid crystal displays 5）
Or button/matrix press-key 6 carries out human-computer interaction, backlight PWM controls can adjust the brightness of screen with the person of being conveniently operated convenient for observation
Clear, for SDRAM as display caching, NAND is user's picture, character library and configuration information memory.
System master clock is provided by external 12M crystal oscillators after PLL frequencys multiplication.RTC clock uses LPC1788/LPC4357 cores
Piece carries, and by the use of the crystal oscillator of 32.768K as clock oscillator, Clock battery reserves CR1220 button cell seats, and it is convenient to replace.
By P2.10 when being downloaded using ISP（EINT0）Move GND to（The 1st of toggle switch SW pushes ON positions）, system
Give tacit consent to UART0（P0.2, P0.3）It downloads.
Claims (5)
1. a kind of TFT liquid crystal serial ports display, including power management module（3）, nand memory（8）, SDRAM/SRAM shows
Buffer memory（4）, keyboard（6）And TFT-LCD（5）, it is characterised in that：The microprocessor of the TFT liquid crystal serial ports display
Device circuit uses LPC1788/LPC4357 processors, and external power supply passes through capacitor filtering and anti-interference process circuit（1）Connect respectively
Connect power management module（3）With backlight pwm control circuit（2）, power management module（3）Output power supply accesses LPC1788/
LPC4357 processors, backlight pwm control circuit（2）Output connection TFT-LCD（5）Backlight, with the LPC1788/
The communication interface circuit of the serial communication connection of LPC4357 processors（9）Including RS485 communication, RS232 communication, CAN bus with
And USB interface.
2. TFT liquid crystal serial ports display according to claim 1, it is characterised in that：External power supply is straight using 8~24V's
Galvanic electricity source, power management module（3）The high voltage of input is converted to by 5V DC voltages using power conversion chip, micro- place is provided
The master control voltage of device circuit is managed, then 5V DC voltages are converted into 3.3V as CPU core voltage, then by positive and negative piezoelectricity through LDO
Road is converted to TFT-LCD（5）Required positive/negative-pressure；The power conversion chip uses LM2596, design compatible MIC4576 or
TD7590 chips.
3. TFT liquid crystal serial ports display according to claim 1 or 2, it is characterised in that：The backlight pwm control circuit
The LED constant current driving chip XL6004 of Shanghai Xin Long semiconductor companies is used as core, the LED constant current driving chip XL6004
It is inputted with 3.6~36V Width funtions, the high-power output of 3A.
4. TFT liquid crystal serial ports display according to claim 3, it is characterised in that：Usb circuit includes usb host
Or USB slave interfaces, host interface are transmitted picture with USB flash disk, and the control to VBUS electric currents is realized by using LM3526-L
And alarm；USB slaves interface passes through computer USB download transmission picture.
5. TFT liquid crystal serial ports display according to claim 4, it is characterised in that：To avoid interfering, in USB interface electricity
Increase TVS protections on DP, DM data line on road, TVS selects PRTR5V0U2X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721861803.1U CN207558328U (en) | 2017-12-27 | 2017-12-27 | A kind of TFT liquid crystal serial ports display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721861803.1U CN207558328U (en) | 2017-12-27 | 2017-12-27 | A kind of TFT liquid crystal serial ports display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207558328U true CN207558328U (en) | 2018-06-29 |
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ID=62660705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721861803.1U Active CN207558328U (en) | 2017-12-27 | 2017-12-27 | A kind of TFT liquid crystal serial ports display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112419964A (en) * | 2020-11-03 | 2021-02-26 | 广东长虹电子有限公司 | LED display screen brightness adjusting circuit and television |
| CN113380208A (en) * | 2021-06-04 | 2021-09-10 | 郑州朗睿科技有限公司 | Serial port display |
-
2017
- 2017-12-27 CN CN201721861803.1U patent/CN207558328U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112419964A (en) * | 2020-11-03 | 2021-02-26 | 广东长虹电子有限公司 | LED display screen brightness adjusting circuit and television |
| CN113380208A (en) * | 2021-06-04 | 2021-09-10 | 郑州朗睿科技有限公司 | Serial port display |
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