MOS tube drive lcd module

Compared with the bipolar transistor is generally believed that the MOS conduction current is not required , as long as the GS voltage is higher than a certain value , it. This is very easy to do , but we also need to speed.
Can be seen in the structure of the MOS transistor , parasitic capacitance between the GS, GD, and the driving MOS transistor , in fact, is to charge and discharge the capacitor .Tsingtek TFT LCD Displays Charging the capacitor requires a current because the capacitor to charge the capacitor can be instantly seen as a short circuit, so the instantaneous current will be relatively large . Select / design MOS tube drive the first to note is to provide instantaneous short circuit current size.
Note that the second , NMOS commonly used in high-side driver , need to be turned on when the gate voltage is greater than the source voltage. The high-side driver MOS transistor is turned on when the source voltage and the drain voltage (VCC) the same , so when the gate voltage than VCC big 4V or 10V. If the same system , to get larger than the VCC voltage , the boost circuit is necessary to specifically . Many motor drives are integrated charge pump, it should be noted that the choice of suitable external capacitor to get enough of the short-circuit current to drive the MOS transistor .
Said above 4V and 10V is a common turn-on voltage MOS tube , of course, need to have a certain margin design. And the higher the voltage , the faster conduction , conduction resistance is smaller. Now there are smaller turn-on voltage MOS works in different areas , but in 12V automotive electronic systems, general 4V conduction suffice.
MOS tube drive circuit and loss , you can refer to Microchip 's AN799MatchingMOSFETDriverstoMOSFETs. About it in detail ,
MOS tube application circuit
MOS transistor is the most significant characteristic of a good switching characteristic Tsingtek lcd display 2x16, which is widely used in the electronic switching circuit needed , such as switching power supplies and the common drive motor , there are lighting dimming .

On the camera's LCD screen

1 you see may not be what you get

Many of my friends like to shoot in RAW format . But in fact when you're shooting in the LCD view when the LCD screen is presented JPEG preview . So , if you see the color, contrast and exposure are not you ask it, do not panic , the file you are actually shooting will contain more data to be adjusted on a computer after the operation .

In addition , we found that the image displayed on the LCD screen than your final printed photos more vivid in color ,Tsingtek OLED modules brightness, stronger, clearer images and more . The reason is that the small size of the LCD screen or backlight illumination , so some exposure and focus on other issues tend not to be perceived by the user.

2 You can zoom through the LCD screen to find the problem

Whether it is a digital DC or digital SLR , its LCD screen can be used to enlarge your picture taken . By enlarging the picture, you can focus pictures taken timely query whether Indeed, the use of depth of field is in place .

3 composition functions can help you

Squares line is almost every digital camera has a function. Squares line can help you through the LCD monitor to compose the shot . ( Digital SLR camera in LIVE VIEW can be presented with the next viewfinder ) .

Using this grid, allows you to take pictures when the composition to ensure the horizon level, to remind myself not to be placed in the middle of the main shooting screen , or check the optimum location of the building trapezoidal distortion and so on.

4 shows a histogram parameters such information

Exposure, brightness histogram from dark to light transition tables and other information have some basic ideas for people photography is very necessary information. After early photographs , watch the histogram trend that lets you know where the photo had burst ( burst over the area will flash to warn ) in order to allow you to make adjustments before the next shot inside the machine .

Many cameras have an independent three-color RGB graphics table , this set of graphical information can help you see in the picture color performance degree . You can find very quickly lost picture is a particular color detail .

Proper use of color histogram lets you photograph in black and white images look richer detail . For example, you shoot red roses and red channel histogram shows that you do not have access to clean moist histogram trend lines , then your performance is certainly lack the red details .

5 By the late Tsingtek COG LCD Display screen image

Now, many digital cameras are built in the latter part of the organic function , although the effect is really simple but very good. You can choose a different color style , and then through the LCD preview.

In addition, the machine also has a lot of camera cropping, and some simple beauty effect. These can preview and save your favorite proofs under the LCD screen .

3D movies really hurt the eyes do

3D TV is a recently popular new things . But now there are a lot of people say that 3D movies hurt the eyes ,character oled then it really true ?
3D content itself is actually no damage to the eyes . Because we humans are in fact seen every day 3D stereoscopic images . There are still a number of medical institutions in the use of 3D content for young people to correct myopia and treatment , we can see , 3D does not contradict itself and the vision health .

As some people get dizzy watching 3D , uncomfortable , this is actually about and display device itself . For example, some 3D TV in 3D mode due to the lower refresh rate, flicker strong sense , it is easy to arouse the viewer's visual fatigue ; also some 3D sources when shooting because there is no good debugging equipment, resulting depth of field problems, this picture also being looked likely to cause visual fatigue and even nausea , TFT LCD Display uncomfortable. All these questions can not blame onto 3D concept.

Some advantages of commercial LCD display

There are a lot of users do not understand, commercial and civilian display screen exactly what is the difference? Today, the difference between a simple presentation on screen between commercial and residential, hoping to help netizens.

1, clarity

Common display devices support only a few TV common resolution specified in the instructions. Because the resolution is only a few civilian television signals, television LCD screen resolution as long as several civilian users based on common use was more effective treatment, a special resolution will result in the video. Commercial display with intuitive features to reflect the image quality, combined with full 1920 x 1080 resolution display for the field of radio and television equipment selection, the LCD screen is the preferred choice of professional display resolution is automatically adjusted according to the display resolution output rate (regardless if they had to support); its high reliability and high-definition display capabilities will ensure that you can record high-definition video edited, the video signal is displayed in the viewer a complete front.

2, stability

Commercial display products usually require 24 hours non-stop operation to meet the needs of a variety of information display, and a display device using the environment than the civilian environment is much worse, the performance of the product which made a higher demand.

And compared to the ordinary display devices, the design, the current commercial display, power, temperature and resistance to electrical interference, capacity and electric shocks margin and the average time between failures are much larger than the former. In the selection of components, various components of the voltage characteristics, current, temperature, humidity and other providers must use significantly higher than TV components; commercial display must also use fully shielded metal case ensure electromagnetic compatibility and interference.

Normal aging display device manufacturing machine in the pipeline is usually energized about 8 hours at room temperature, and the aging machine supplier obvious need in the high temperature and humidity in a closed environment of aging pipeline aging electricity for more than 24 hours to ensure the machine stability. On installation, commissioning, especially components and the aging process requirements, business requirements are significantly higher.

3, Panel

Although commercial and civilian display TFT LCD panels are used, but there is a big difference between them. The biggest difference between them mainly in the size of the liquid crystal molecules, image processing and color, brightness and contrast, viewing angle and so on.

Ordinary LCD display is more important to performance of the entire screen, a small part of the request is not very demanding, more important is the use of a liquid crystal can reduce the cost of macromolecules. Liquid crystal molecules than ordinary LCD panel 256x64 oled display screen to big business, because commercial display when viewing distance is generally not more than one meter, the most important thing is to show the details of the liquid crystal molecules are smaller, Of course, this panel cost is more expensive.

4, the interface

Of course, there are many common display devices also have a RS-232 control port, but its use is basically just used to control lighting, etc., and can not be achieved in industrial control. Because the feeder demand, commercial displays general use industrial port, such as the color RGBBNC with interface and professional video interface DVI-D self-locking mechanism and so on. In addition, suppliers can be significant S232 serial control, password control and open up to more than 200, to adapt to a variety of industrial environments. Easy to use multi-display, not by remote control can control all display devices, and be able to assist, boot time, delay boot, self-test machines and other industrial requirements.

With the continuous development of display technology, in addition to civil, many display manufacturers have launched a commercial display products, these products are mainly used in many public display areas like subways, airports, shopping malls, etc., used to display a variety of real-time Information for people's daily life provides a great convenience. TFT LCD Displays has become a modern society, people work and live essential equipment.

LCD panel can show the number of colors

In the purchase of Graphic LCD Display TV, in addition to often see the screen size, resolution, brightness, contrast, response time specification parameters, often we will find that there is a word called "Colors." Different brands and models of LCD TVs for the description of the number of different colors, the corresponding figure is night and day to another, some marked only 16.7 million, some labeled as 1 billion, as well as a more exaggerated marked as 28.9 billion. So, what these numbers represent what the meaning behind its products can reflect much difference between it?
 
LCD TV can show a number of colors by what factors determine it?

First, we have to be cognizant of two completely different concepts, one is the LCD panel can show the number of colors, an internal circuit is capable of handling the number of colors, both of which are related to the lcd modules TV can be displayed delicate color gradation extent.

LCD panel can show the number of colors

LCD panel can be expressed by the number of colors inherent physical characteristics of the panel decision. According to the basic principle of the liquid crystal display image, the liquid crystal molecules by two glass substrates attached to the upper and lower driving voltage between the occurrence of the corresponding deflection angle, the light through the liquid crystal layer when the angular deflection according to the size of the liquid crystal to obtain different levels of transmission, the This is reflected in the panel have different levels of gray scale contrast. When light passes through the liquid crystal layer needs through the filter, the filter corresponding to each pixel is divided into red, green, and blue small squares, the original white light from these small squares separated out after filtration , the entire panel can present a variety of colors, which is colorful screen display panel simple principle.

LCD driving principle


The liquid crystal panel of the full color image forming process
From the above description it can be seen, the panel can be expressed by the number of colors of the liquid crystal drive deflection angle of the degree of sensitivity. Assuming deflection voltage variation and LCD is divided into 256 steps, then when the voltage generating a step change in the liquid crystal along the angle of deflection of an order, so the panel can show a color change of order; However, if the voltage to produce a step change When the liquid crystal molecules did not produce a corresponding first-order angular deflection, then no one step on the performance of the panel color changes.

Therefore,OLED Module  there is a liquid crystal panel, the number of colors can be expressed concept, which is determined by the panel of the innate physical properties. As in the display people tend to care about what is TN panel or a VA panel, largely because TN panels can be demonstrated by the number of colors as rich VA panel, showing a level of less than VA panel screen delicate vivid. Of course, the above description is idealized assumption, I just hope that this can be expressed in a more intuitive and easier to describe the problem.

How to solve the mosaic screen Huaping phenomenon of aging and

LCD splicing screen because it is easy to work long hours to make certain pixels overheating, once more than the limit will lead to permanent damage , which formed often say " dead pixels ." Since Character LCD Module splicing screen pixel is constituted by the LCD , so when the full load continuously for 96 hours or more , it will accelerate to its aging , even when serious burn. So, if you must work long hours , it is best able to let it rest for a while intermittent , or often in different time intervals to change the screen contents appear , because the state is waiting for work to reduce the brightness , or in screen saver mode operate under a will , which require little effort not only retard aging of the LCD screen , and avoid hardware damage occurred .

In addition , LCD whether any problems , prohibit self- assembled LCD splicing screen ( special is especially interested in the general DIY ) , once the LCD splicing screen is not working properly you can find vendors to help solve. Since the LCD backlight assembly transformer off after a certain time is still possible with the 1000V high voltage ( albeit micro-current ) , not specialists if not handled properly may result in failure of the new component .

Moreover , COG LCD Module screen is very fragile delicate, impact resistance is poor. This is because the LCD contains a lot of precision glass element and agile delicate electrical components , once subjected to strong shock will cause the LCD screen , and other related components damaged. So be sure to avoid strong impact shocks. At the same time , but also pay attention not to exert pressure on the LCD screen surface , such as a screen with a finger pointing the site , it is very likely to cause dead pixel number of moves.

Besides, if find LCD splicing screen surface dirt , accurate method should be used to remove dirt . It is best to use a medium soft, non-fibrous material, such as cotton , lens tissue or a soft cloth, and then gently wipe stained with a little glass cleaner , prohibit the use of alcohol, a class of chemical solution , nor can the rough cloth or paper items , as these substances prone to scratches. Here to remind everyone that , do not spray cleaning agents directly to the surface of the screen appear , it is very easy to flow inside the screen causes the OLED Display screen internal short-circuit fault , resulting in unnecessary losses.

LCD splicing screen features

1 , high brightness

LCD screen with TV and PC compared , DID LCD splicing screen has a higher brightness. TFT LCD Displays TV or PC screen brightness generally only 250 ~ 300cd/m2, while DID LCD screen brightness can reach more than 700cd/m2 .

2 , High Contrast

DID LCD splicing screen has a 1200:1 , even up to 10,000:1 contrast ratio, than conventional LCD PC or TV to more than double the normal projection of three.

3 , better color saturation

Ordinary CRT color saturation of only 50 %, while DIDLCD can reach 80% -92 % of the high color saturation , which benefited from professional development products for the DID color calibration technology , through this technology, in addition to still images color calibration, but also on the dynamic screen color calibration , so as to ensure accurate and stable image output .

4 , a wider viewing angle

PVA (PatternedVerticalAlignment) technology that is " vertical image adjustment technology" , the use of this technology, viewing angles up to dual 180 ° ( horizontal and vertical )OLED Module .

5 , better reliability

Ordinary LCD TVs , PC monitors design, does not support the night of continuous use , DID LCD screen for monitoring center, exhibition center designed to support 7x24 hours of continuous use .

6, pure flat panel display

LCD flat panel display equipment , is truly flat screen monitors , no curvature at the big picture , no distortion.

7 , slim narrow design

DID have a large product display area at the same time , there are thin , light weight advantages , easy to splice and installation. Splicing dedicated LCD screen, narrow its excellent design , making it the edge even in a single centimeter or less, such a small edge effect will not affect the overall display screen .

How to identify the original color TV

As living standards improve, everyone on the brand and quality appliances are increasingly critical, while imports of household electrical appliances will naturally be more popular. But in the purchase process, consumers are buying is difficult to clearly identify whether imported appliances is original .TFT LCD Displays By following highlights we will be better able to distinguish whether you purchase home appliances original products .

First , look on the box is printed with the trademark or brand , its upper right corner or small fonts printed on the bottom right corner of the word , and only after the registration of the company recognized the quality of products , the right to use this package , while the cottage or counterfeit there will not be such a logo. Meanwhile, in the electrical back cover will usually be clearly identified producing countries ( such as Japan MadeinJAPAN) or production areas ( such as Hong Kong manufacturing MadeinHongKong), through which identity can be distinguished in the local manufacturing or in the overseas subsidiaries. Some appliances not marked origin, can be checked by using the manual ,COG LCD Module  if the instructions printed on the printing Home location can be determined that the product is assembled in the production .

Second, cottage or counterfeit often use to add, delete , change the way of foreign brands to imitate , and even that is a complete theft trademarks to cheat . At the time of purchase , the consumer must pay attention to the product packaging or instructions on the label which company produced , in order to confirm whether the company's products.

Factory network video surveillance system analysis

Factory video surveillance system preliminary design to meet the needs of existing resources and network performance , front-end video capture subsystem , the monitoring center video management system construction are to meet the Ministry of Public Security "to carry out urban Security Alarm System Construction Work" performance requirements , and strive to run the system is stable , reliable data storage , archiving video data on a regular basis .
First, the video surveillance system to protect plant and public activity areas of staff safety , security equipment and other important facilities and property safety , prevention of sabotage activities, and accidents , the first time made ​​the process of incident recording, handling and accountability for the timely provide strong evidence .Character LCD Display This is the basic function of video surveillance requirements. Another important aspect of the video surveillance system can be factory daily production process , play a supporting role in the production , production line unattended .
According to government requirements and internal management of production safety regulations , and in accordance with the relevant national standards , combined with the plant needs to develop a network video monitoring video monitoring system functions to achieve the following objectives:
1 ) Video capture function: capture video front-end video capture system and follow the transmission requirements for compression , encoding , converts through Access Gateway , meet in a digital format of the information transmitted over the Internet exchange .
2 ) video transmission function: After compression, encoding video information , in accordance with the work flow in a factory dedicated network for transmission , according to the security management authority, constitute transmission network system at all levels . Same time be able to meet the monitoring system management needs, transferred to the superior system and stored.
3 ) The information processing functions : Distribution of the received video information system, etc., COG LCD Module according to the classification and attribution video processing, the call processing information stored .
4 ) video storage and backup functions: video monitoring center server information, system logs should be stored historical data storage and backup information is available in a network system based on permissions playback.
5 ) System Control Function : According to authorized users of the network control command sent to the front-end system, the monitoring center and authorized end users to call any way monitor images and control.

Three-dimensional image display applications

Currently three-dimensional image display is mainly used in the workstation (workstation), comics, cartoons and other animation, medical purposes, educational purposes as well as aviation, automotive simulation teaching, game console and other fields. Such as medical uses stereoscopic endoscopy, stereoscopic microscopes, the use of surgical guidance system, the use of CT, MRI medical diagnosis, visual function tests, Character LCD Modules medical education, medical training and so on.

Although the new generation of three dimensional stereoscopic display resolve many shortcomings, and dramatically increase the viewing stereoscopic range, but it also faces inadequate consumer awareness, expensive, single use only face challenges such as practical. For single use issues, the current plan has drawn more toward the direction of exploring, developing multi-user stereoscopic display,Serial Lcd Display Module in addition to production of precision, mass production and ripple control is one of the items to be overcome. Three-dimensional images expected future market will be with the software and hardware technology continues to expand, which means keep abreast of the pulse of the market, the timely provision of related technologies become more important.

What advocates locking 19-inch LCD computer

Higher prices also equipped with high-quality

According to Sina an LCD display on the survey results show that more than 1.01 million ballots 82.4% chose the much more expensive than CRT monitors LCD monitors. People hoping for LCD computer psychology is evident.

Analysts believe that if the 15-inch QVGA lcd computer rage is the inevitable demand for consumer health, consumer comfort pursuit spawned a 17-inch LCD PC's popularity, so now the majority of users of visual desire, is bound to 19 inch LCD into the PC market center stage.

19-inch LCD computer text processing is no longer just stay in this level, in the aspect of today's broadband, digital clusters in the world, the computer's multimedia processing capabilities have become increasingly demanding. "A computer can easily and quickly dump a variety of digital devices in the pictures, videos and personalized editing; whether it has a mass of digital throughput, allow consumers freedom to exchange data; whether facilitate contacts, high-speed a variety of audio and video data download and transfer; and, ultimately, whether a customer through a computer interface, to bring consumers a more pleasant shopping experience, will become a 19-inch LCD computer consumers consider the new standard. "experts said," Based on this , including a display area, viewing angle, resolution, or even outside of fashion elements, etc. factors, determines the Graphic LCD Display computer is to 19 inches to the era of rapidly moving into the mainstream. "

Cleanroom technology applications in several hot issues currently

I. Introduction
Cleanroom air velocity / ACH, has been a concern in cleanroom design issues, with the clean room to increase pollution control results and final stage filter efficiency, etc., on the relevant norms, guidelines and other recommendations made or reference values ​​are conservative, there are many discussions; FFU in the application of the feared noise, damage repair and other issues have been resolved in practice, with the continuous improvement of FFU, FFU on whether to adopt the return air system is also a Hot: Suspended molecular contamination (AMC) control in the microelectronics and IC industry has been growing on the agenda, attention. The following cases were on these issues as summarized and analyzed.

Two. Airflow velocity
2.1 For recommended applications or reference values
Clean indoor air speed under certain cleanliness to determine, with the clean room use and other specific circumstances vary, it is not only affected by the amount of dust and indoor filter efficiency is also affected by other factors, in terms of industrial clean rooms, cleanliness and choices affect flow rate of the main factors are:
(1) indoor sources: building components, the number of personnel and operational activities, process equipment, process materials and processing technology itself, are all dust sources of release, according to the specific circumstances vary, vary greatly;
(2) indoor air flow pattern and distribution: unidirectional flow requires uniform and equal flow lines, but will be subject to changes in process equipment and personnel arrangement and location of activities such as the formation of local vortex interference; rather than unidirectional flow requires sufficient mixing, Avoid dead ends and temperature stratification;
(3) purification time (recovery time) control requirements: clean room or accidental releases of pollutants into the air or gas flow during normal operation is interrupted or intermittent convection currents or other movement of persons and equipment will result in the deterioration of cleanliness , return to the original time to determine the cleanliness of the gas flow velocity purification; the purification time control requirements depend on this time frame (lower cleanliness deterioration), the product of the quality and yield of the production capacity of impact;
(4) the final stage of the filter efficiency: COG LCD Module in a certain amount of dust indoors under high efficiency filters can be used to reduce the flow rate; energy should be considered as a high efficiency filters and reduce the flow rate, or a lower efficiency filter and the higher flow rate, in order to the product flow and least resistance;
(5) economic considerations: excessive air velocity resulting in an increase in investment and operating costs, the appropriate air velocity above factors reasonably comprehensive, too often unnecessary, does not necessarily have an effect;
(6) low demand for cleanliness cleanroom, sometimes ventilation frequency depends on the indoor heat requirements.
These factors are difficult to quantify, can only be analyzed and compared and estimates. Therefore, in engineering applications, for cleanroom air velocity tends to refer to the relevant norms, OLED Display Module guidelines and other recommendations or reference value, and then the specific circumstances of the estimated impact of the above factors were determined after comprehensive consideration.
Air velocity for unidirectional flow clean room; non-unidirectional flow clean room ventilation frequency is preferred because it is difficult to measure accurately airflow velocity; also littered with late-stage filtration rate to reflect, and can be used for various types of air flow clean room, generally covered with 100% relative to the flow rate of 0.5m / s (100fpm), 25% relative to 0.125m / s (25fpm). Current relevant norms, guidelines and other recommendations or reference values ​​are shown in Table 1.
Note: 1, ISO14644-4 for the air velocity / ACH is clear as reference materials listed in the table only for microelectronics and IC factories; right column ISO5 only pharmaceutical grade air velocity> 0.2m / s, right ISO6 ~ 8 级 Jiewei lists reference values.
2, (M) refers to the mixed flow, N refers to the non-unidirectional flow; * refers to the isolation of pollution has taken effective measures to clean areas.

Kind of SXL type cleanroom testing methods

SXL-type device is a clean room with air unidirectional flow (horizontal parallel flow) for laminar flow filtration, and by multi-stage purification, and then purified by the air supply unit air to the work area, so repeated high cycle work cleanliness cleanroom. SXL-type clean room is also equipped with FL-1-type air shower a desk, air shower installed in the clean room at the entrance, the operator must enter the clean room work through the air shower air shower. Air shower when contaminated air through the middle and high efficiency air filters, filtered clean air through the vents blowing tangential direction at high speed rotation of the human body, will be attached to blow off the dust on the clothes.
The clean room area is 13m3; cleanliness level is 100 (≥ 0.5μ total number of particles ≤ 3.5 粒 / L; total air volume ≈ 6000m3 / h, fresh air, 5%; workspace sectional average wind speed ≥ 0.35 m / s; ventilation frequency about 180 times / h; interior pressure ≥ 0.5 mm water column; noise <70 dB (A building); mains power is FL-1 type Airshower 10.1kW, 380V, DY- a type of air purification unit 1kW, 380V, 380V and 220V lighting and electrical outlets, etc. cleanroom wind shower circuit by controlling the electrical box, electrical box and is equipped with 450V 75A ammeter and voltmeter each one due to the device has a clean high, sealed, rigid, lightweight and beautiful, easy to dust, but in a relatively short period of time into a higher level of clean working environment, it is widely used in electronics, precision instruments, meters, medical and requirements of the various air clean and high production sites; also commonly used in quality control, health and epidemic prevention, hospitals and other authorities require a high degree of sterile air cleaner room, operating room.
Since the device's power supply power is larger, therefore, will be in use should be regularly current, voltage meter to send measurement department test, and note that the device is working Never overload of work, should always observe the operating status of the device when the electrical control box current, voltage meter indicated current, TFT Lcd Modules voltage and the actual use of current, voltage is consistent, the use of larger and current ammeter indicated current is very small, and you should immediately stop using the ammeter measurement department to send verification and maintenance. Also note that wind leaching room clean room cleaning, before the experiment, after dilution with 5% Lysol wipes filtered liquid air, return air purification unit, the device wall, work surfaces and Airshower filters walls and outlet, the filter cleaning unit should always be removed to clean, purify the air supply unit in order to ensure normal operation. Also, frequently clean indoor air cleanliness testing, the test requires some instruments, such as the level of cleanliness (clean indoor air dust concentration) required particle counter measurement; sectional average wind speed required heat
Ball anemometer to measure; interior pressure required tilting micro-manometer measurement; noise measurement required precision sound level meter and so on. Press the test method for measurement of the clean room, the test results are accurate, but because of this test method requires more equipment, and the use of equipment units are generally impossible to have this test condition, it is not possible according to the above method Clean room for testing. So, how do people use the clean room air cleanliness know what? Graphic LCD Module How a human right cleanroom contamination? How to make test results with true, accurate it? Here's a clean indoor air by precipitating bacterial tests to the test results to determine the cleanroom easy way. This method - by natural sedimentation sedimentation principle microorganisms collected particles in the air under high pressure to the glass plate in bacteria, adding 45 ℃ temperature nutrient agar medium, mixed core cooling, after some time under suitable conditions Reproduction allowed to count colonies visible to the colony plate clean environment to determine the number of live microorganisms, and in order to assess the clean room dust concentration.

With memory interface, LCD display module

Dot-matrix LCD interface is simple, can be graphically display raster or a variety of information, so a variety of electronic design has been widely used. However, its interface must follow certain hardware and timing specifications, depending on the liquid crystal driver, may need to issue different commands to control to display the data. And execution of the command takes some time, a large number of real-time data in the system in the case, if the direct control of the liquid crystal display, may consume too much time, thus affecting the data processing. Therefore, as a need to use different COG LCD Module, which require software changes. To solve these problems, the paper proposes use of the memory interface LCD module, the existing dot-matrix LCD screen attached an MCU (Micro-Controller Unit microprocessor) and related devices, the use of memory with an external controller interface, thus solve a unified interface and display speed problems.
We know that the human eye phenomenon of persistence of vision, change every 0.1 seconds within the image appears to be a considered continuous, and only 0.1 seconds of changing images difficult to detect the human eye. According to this physical phenomenon, we use an external memory controller interface design a LCD interface module, the external controller to display the data is written directly interface to memory, depending on the interface refresh LCD display. Refresh rate more than 10 times per second, you can achieve continuous display purposes. Of course, the higher the refresh rate of the human eye image change can feel more continuous and smooth.
Wen proposed lcd module using memory and an external controller to interface with unified interface specification. External controller to display the contents of the liquid crystal display module directly into the display memory interface can be realized, not directly complicated and time-consuming matrix LCD control processing operations, is conducive to the controller for real-time processing of large amounts of data. There are currently a large color LCD screen uses a similar program, but expensive. For general applications, this paper presents the LCD module is highly versatile, and increased hardware costs less than buying a single dot matrix LCD 20%, it can be widely applied.

PI oriented film properties

PI-oriented film is composed of:
The heat curable polymer PI, PI alignment film component of the stock solution is a polyimide and DMA, NMP solvent and BC.
The UV-curable polymer PI, PI alignment film component of the stock solution with UV-active group is a polyimide and a solvent,128x64 oled such as PI liquid crystal orientation direction is the direction of radiation, so there soon productivity and convenience of operation , but because it is often insufficient polymerization, the current use of products make it into a single point defects in the display when a higher rate applies only to convert some of the light curtain's productions, rarely used on the LCD display, the following are no longer Description.
PI-oriented characteristics of the film:
Directing film with a PI LCD solids content in the stock solution is a small molecule compound, which is generated at a high temperature polymerization reaction to form with many branched long chain macromolecular solid polymer polyamides. Polymer molecules are branched chain and the main chain of the angle is called a pretilt angle guide layer. These polymers are branched chain group and the liquid crystal molecules between the relatively strong force, the liquid crystal molecules have the role of anchor,lcd module the pretilt angle of the liquid crystal can press direction.
PI not complete the polymerization liquid or a polyimide is a small molecule binding with the water molecules was sol, it will inhibit the polymerization of polyimide, not complete the main chain, branched-chain and have lost the original arrangement direction, lack of the required pre-tilt LCD production. So PI dope to moisture, humidity operating environment should be strictly controlled.
Some special STN and TFT PI, the cured in branched form on the basis of sub-branched, branched and branched times even the angle between the liquid crystal molecules coincide end structure or similar, so the liquid crystal have a more a strong anchoring effect. Thanks to the second branched-chain, such as if the liquid crystal molecules to increase the contact area between the guide layer, to a certain extent compensates for some of the guide layer processing defects. The PI in a large area display allows display more evenly. While avoiding rubbing treatment process in order to obtain high strength friction lower density higher friction, damage is relatively fragile and TFT generator CF layer.
Have been cured of the PI-oriented film can easily absorb moisture, and will break down in the water. And after rubbing treatment, the PI layer is likewise more fragile, prolonged exposure to the air, with the air in the water and carbon dioxide, thereby disrupting the original state of a branched arrangement, so that the pretilt angle is uneven, and even produce pretilt collapse phenomenon.
PI classification:
PI size at the pretilt angle is divided into:
1 to 3 degrees of low pretilt angle of the TN type PI and 4 to a high pretilt angle of 9 ° STN type PI.
PI affect the main parameters of the performance-oriented film
Solid content; viscosity; Na ion content; thermal decomposition temperature; permittivity; volume resistivity; transmission; absorption; refractive index; pretilt angle

And white light LED technology

Paradoxical LED emits monochromatic light, the color light illumination apparatus with, as compared with most conventional light sources, because of its high power efficiency, that a better color light. However, with the LED light source instead of the traditional, you must determine the white LED should achieve the necessary level of efficiency and quality. Due to radiation blue - green spectral components of GaN LED unprecedented progress, white lamps have great prospects. There are two ways to achieve white light serial oled:
One is to separate the radiation of red, green, and blue light LED hybrid (known as RGB); another band fluorescent radiation is radiation GaN blue combination, it can become part of the blue light-wave radiation, and with The remaining blue light and emits white light combination. Whether the first or second method may be obtained with two colors of white light component; has three color components of the color quality can be obtained (Ra 80-90), for a process using the phosphor techniques using two different components, as well as the middle of the program.
Theoretically RGB method is more effective, but requires auxiliary optical devices, resulting in reduced efficiency and increased system costs. The problem with phosphor simple, it is the efficiency of the phosphor, which may become a RGB series. However, these two processes is the main difference between the technologies, RGB method can "mix color", then the phosphor is stability. With different phosphors, RGB France in the lighting field has opened up new possibilities. From the white LED light efficiency growth prospects of view, LED using the phosphor at near 2005 Good results can be achieved, luminous efficiency of 50lm / w, we can predict that the white mini lcd module lamp is used for today and halogen in place.

Touch screen works

We will look further into the two most commonly used touch-screen technology. The most widely used technology is resistive touch. Before the might of the vast majority of people are in the bank's ATM machine, many credit card in the mall inspection machines, or even enter a single ordering in a restaurant used this type of resistive touch technology. Projection-type capacitive touch screen, use the range is not so wide, but with the rapid development of power. Projection-type capacitive interface mobile phones and portable music player in the market. Either resistive or capacitive technology has a sturdy electrical component, the use of ITO (indium oxide tin, transparent conductors), these two techniques will be long-term use.Low Temperature Display
The resistive touch screen includes a flexible top layer, then a layer of ITO, an air gap, followed by another layer of ITO. The panel has four wires attached to the ITO layer: "X" layer of the one of the right and left side of each one of the top and bottom of the "Y" layer.
When the flexible top-level pressure contact with the following layer detected by touch. The position of touch is measured by the following two steps: First, X-right "to be driven to a known voltage, while" X Left "is driven to ground, the voltage read from the Y sensor. This provides the X coordinate. Repeat this process for the other axis to determine the precise location of the finger.
Resistive touch screen, 5-wire and 8 linear. 5-wire type with a more durable and low-resistivity conductor layer instead of the top of the ITO layer. 8-line panel through better calibration characteristics of the panel to achieve higher resolution.
For resistive technology has several disadvantages. The flexible top transmittance of only 75% -80% of the (Impact resolution), and Multiple sources of error in the measurement process of the resistive touch screen. If the ITO layer is inconsistent, the resistance of the sensing range will not be linear. 10-12 measuring voltage accuracy, which is difficult in many environments. To the touch points and lower the LCD image alignment, many existing resistive touch screen requires periodic calibration.
On the contrary, the projection-type capacitive touch screen with no moving parts. ITO and the transmittance is almost 100% of the glass sheet between the LCD and the user. The projection type capacitance sensing hardware comprises a glass top (see Figure 2), The following is an X sensor array, a layer of insulating glass, then the following is the Y sensor array is located on the glass substrate. The panel is connected to each of the X and Y sensor, 5 x 6 panel a total of 11 connections (as shown in Figure 3), 10 x 14 panel 24 sensor connection.graphic lcd display module