CN203787065U - Sectional multipath LCD driven by I/O ports of MCU - Google Patents
Sectional multipath LCD driven by I/O ports of MCU Download PDFInfo
- Publication number
- CN203787065U CN203787065U CN201420108386.3U CN201420108386U CN203787065U CN 203787065 U CN203787065 U CN 203787065U CN 201420108386 U CN201420108386 U CN 201420108386U CN 203787065 U CN203787065 U CN 203787065U
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- CN
- China
- Prior art keywords
- mcu
- lcd
- pcb board
- microcontroller
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000004973 liquid crystal related substance Substances 0.000 claims description 22
- 230000011218 segmentation Effects 0.000 claims description 9
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Provided is a sectional multipath LCD driven by I/O ports of an MCU. An LCD screen, metal pins, an LED backlight source, a PCB and the MCU are included, wherein the MCU is arranged at the surface of the PCB, the I/O ports of the MCU are connected with the metal pins of the LCD screen via wires on the PCB, the LED backlight source is connected with the PCB, and the LED backlight source is also connected with the I/O ports of the MCU via the metal pins and the PCB. The LCD of the utility model has the advantages that an SMT bonding technology is utilized, the LCD is compact is structure and small in size, on/off of LED can be controlled by the MCU according to the surrounding, energy is saved, the cost is reduced, and the LCD has good market prospects and high popularization values.
Description
Technical field
The utility model relates to field of liquid crystal, relates in particular to a kind of liquid crystal display that is now driven segmentation multichannel by the I/O cause for gossip of MCU.
Background technology
LCD screen is as main display device, be widely used in the numerous areas such as national defence, industry, family expenses, communal facility, the liquid crystal that LCD liquid crystal display uses must exchange driving, if use direct drive, liquid crystal molecule will electric polarization, the destroyed forfeiture Presentation Function of molecular structure, traditional liquid crystal display, adopt special liquid crystal control drive IC, adopt bias voltage method to exchange and drive liquid crystal display, outside is connected with MCU by system interface; Or LCD is controlled to driver and be implanted to MCU inside, MCU sends the content of instruction, Data Control demonstration LCD screen by software, be like this MCU that must select with LCD controller, if systematic comparison is simple, have part I/O idle, waste system resource is selected with the MCU cost of lcd controller relatively high simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of liquid crystal display that is now driven segmentation multichannel by the I/O cause for gossip of MCU, utilize the tri-state function of the I/O mouth of MCU, add draw, pull down resistor, can produce three kinds of voltage VDD, 1/2VDD, 0, utilize I/O tri-state function, digital signal can be become to simulating signal, the LCD that produces 1/3duty, 1/2bias, frame frequency 83HZ exchanges drive waveforms, realizes the control of LCD display is shown.
For achieving the above object, the utility model is realized by the following technical solutions:
Now driven a liquid crystal display for segmentation multichannel by the I/O cause for gossip of MCU, comprise LCD display, metal pin, LED-backlit source, pcb board, microcontroller, described LCD display is the positive display mode of TN, is connected with pcb board by 11 metal pins; Microcontroller is arranged on pcb board surface, and the I/O port of microcontroller is connected with the metal pin of LCD display by pcb board cabling; LED-backlit source is connected with pcb board; LED-backlit source is connected with the I/O mouth of microcontroller by metal pin, pcb board.
Described LCD display is for driving 3COM X8SEGMENT=24 pixel.
Described LCD display adopts half-reflection and half-transmission display mode.
Compared with prior art, the beneficial effects of the utility model are:
The utility model adopts SMT nation determine technology, has advantages of that compact conformation, volume are little, but also can, according to external environment, be controlled the light on and off of LED by MCU, the saving energy, reduces costs, and has good market outlook and promotional value.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is that the input/output port of the MCU of realization of the present utility model drives multichannel liquid crystal display principle of work block diagram.
Fig. 3 is the simulation output waveform figure that the utility model is realized the input/output port driving multichannel liquid crystal display COM sweep trace of MCU.
Fig. 4 is the input/output port driving multichannel liquid crystal display-driving schematic diagram that the utility model is realized MCU.
1-LCD display screen 2-metal pin 3-LED backlight 4-PCB plate 5-microcontroller
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further illustrated:
As shown in Figure 1, a kind of liquid crystal display that is now driven segmentation multichannel by the I/O cause for gossip of MCU, be made up of LCD display 1, metal pin 2, LED-backlit source 3, pcb board 4 and microcontroller 5, described LCD display 1 is the positive display mode of TN, is connected with pcb board 4 by 11 metal pins 2; It is upper that microcontroller 5 is arranged on pcb board 4 surfaces, and the I/O port of microcontroller 5 is connected with the metal pin 2 of LCD display 1 by pcb board 4 cablings; LED-backlit source 3 is connected with pcb board 4; LED-backlit source 3 is connected with the I/O mouth of microcontroller 5 by metal pin 2, pcb board 4.
Realize the method that is now driven segmentation multichannel liquid crystal display by the I/0 cause for gossip of microcontroller, concrete operation step is as follows:
1) the I/O mouth of micro-control unit MUC is ternary output, and each I/O mouth connects pull-up resistor and pull down resistor, produces VDD, 1/2VDD, 0 three kinds of voltages, and utilizes I/O tri-state function, and digital signal is become to simulating signal;
2) LCD that microcontroller produces 1/3duty, 1/2bias, frame frequency 83HZ by the instruction control of VDD, 1/2VDD, 0 three kinds of voltages exchanges drive waveforms, realizes and drives the displaying contents of controlling LCD screen.
Wherein duty is scanning way, and bias is bias voltage ratio.
In described step 1), resistance is 10k, adopts 1% precision resistance.
Described LCD display 1 is for driving 3COM X8SEGMENT=24 pixel.
Described LCD display adopts half-reflection and half-transmission display mode.
I/O tri-step responses (high level, low level, indeterminate state) of MCU, on com port, add draw, pull down resistor, can produce three kinds of voltage: VDD, 1/2VDD, 0 by control command, according to wanted displaying contents, simulation produces LCD dynamic driving waveform, drives LCDs.
As shown in Figure 2, external sensor or control signal are input to microcontroller, and microcontroller is processed and formed the information that will export through signal, simulates the interchange drive waveforms of wanting displaying contents by software control simultaneously, output to LCD display 1 by I/O, formation information shows.
Fig. 3 is the simulation output waveform figure that the utility model is realized the input/output port driving multichannel liquid crystal display COM sweep trace of MCU; Wherein bias is bias voltage ratio, and COM is that LCD scanning is capable, and VDD is supply voltage, and VSS is power supply ground.
The utility model adopts SMT nation to determine technology, compact conformation volume is little, use LED-backlit source 3 working at night, utilize the tri state output characteristics of the I/O of microcontroller 5, each I/O mouth connects pull-up resistor and pull down resistor, resistance is 10K, prevents DC component, must adopt 1% precision resistance.Add at COM output line as shown in Figure 4 draw, pull down resistor, there is software control can produce VDD, 1/2VDD, tri-kinds of voltages of 0V, and then can simulate the LCD interchange control drive waveforms that produces 1/3duty, 1/2bias, frame frequency 83HZ, control the displaying contents of LCD screen, can utilize software simulation to substitute the function of LCD control drive IC, thereby reduce volume, reduce costs.
Each SEG converts between VDD and VSS; COM be liquid crystal scan line voltage at VAA, VDD/2, changes between VSS; SEG is the data rows of liquid crystal display; Pn.m is the port of microcontroller 5.
Claims (3)
1. one kind is now driven the liquid crystal display of segmentation multichannel by the I/O cause for gossip of MCU, comprise LCD display, metal pin, LED-backlit source, pcb board, microcontroller, it is characterized in that, described LCD display is the positive display mode of TN, is connected with pcb board by 11 metal pins; Microcontroller is arranged on pcb board surface, and the I/O port of microcontroller is connected with the metal pin of LCD display by pcb board cabling; LED-backlit source is connected with pcb board; LED-backlit source is connected with the I/O mouth of microcontroller by metal pin, pcb board.
2. a kind of liquid crystal display that is now driven segmentation multichannel by the I/O cause for gossip of MCU according to claim 1, is characterized in that, described LCD display is for driving 3COM X8SEGMENT=24 pixel.
3. a kind of liquid crystal display that is now driven segmentation multichannel by the I/O cause for gossip of MCU according to claim 1, is characterized in that, described LCD display adopts half-reflection and half-transmission display mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108386.3U CN203787065U (en) | 2014-03-11 | 2014-03-11 | Sectional multipath LCD driven by I/O ports of MCU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108386.3U CN203787065U (en) | 2014-03-11 | 2014-03-11 | Sectional multipath LCD driven by I/O ports of MCU |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203787065U true CN203787065U (en) | 2014-08-20 |
Family
ID=51323226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420108386.3U Expired - Lifetime CN203787065U (en) | 2014-03-11 | 2014-03-11 | Sectional multipath LCD driven by I/O ports of MCU |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203787065U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854623A (en) * | 2014-03-11 | 2014-06-11 | 亚世光电股份有限公司 | Segmented multi-path liquid crystal display achieving driving by I/O port of MCU and method |
-
2014
- 2014-03-11 CN CN201420108386.3U patent/CN203787065U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854623A (en) * | 2014-03-11 | 2014-06-11 | 亚世光电股份有限公司 | Segmented multi-path liquid crystal display achieving driving by I/O port of MCU and method |
| CN103854623B (en) * | 2014-03-11 | 2017-01-18 | 亚世光电股份有限公司 | Segmented multi-path liquid crystal display achieving driving by I/O port of MCU and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |