2. The principle of touch screen technology is introduced.
3. Excellent touch screen -E 1O touch products.
5. Typical application of touch screen
Secondly, the principle of touch screen technology is introduced.
Touch screen is the most convenient, simple and natural input method. People who know nothing about computers can operate computers when they get up. The user looks at the displayed content and simply touches the content he wants to select. Through the touch screen, people can enjoy your application software and query the information they are interested in.
Because the touch screen is the most suitable input device for information query, all developed countries are actively developing touch screens, just like PC developed from 286 and 386 to Pentium, touch screens also developed from low-end to high-end, from infrared and resistive to capacitive sensing, and now they have developed into surface acoustic wave touch screens and five-wire resistive touch screens. Performance is more and more reliable and technology is more and more advanced. For example, the EloTouch surface acoustic wave touch screen in the United States is installed with a piece of pure glass without any coating, which indicates the arrival of the mature product era of touch screen in terms of clarity and durability.
This chapter mainly introduces the surface acoustic wave touch screen, resistance touch screen, capacitance induction touch screen, infrared touch screen and other technologies in the domestic market one by one. Although the news that the famous foreign TPIS infrared touch screen was discontinued came as early as the beginning of 1995, in a short time, all domestic military forces will coexist in the domestic market for a period of time with a balanced price.
Due to the characteristics of the touch screen itself, the requirements for the touch screen are not only very transparent and accurate, but also long-term accurate, stable and reliable, which does not affect the appearance and is not easy to be destroyed. Therefore, judging the advantages and disadvantages of a touch screen technology is mainly based on these points.
First of all, the characteristics of various touch screens are as follows:
kind
perform
surface acoustic wave
electric capacity
infrared
Five-wire resistance
Four-wire resistance
Good clarity, blurred character images, and blurred character images are better.
Reflexivity is rarely serious, even less.
Light transmittance 92% (limit) 85% 75% 55%
No color distortion.
The resolution is 4096× 40961024×1024 40× 32 4096× 40961024.
Whether the influence of pressure axis exists.
Drift, no drift, no drift, no drift.
Very good scratch resistance, not afraid of hard objects, not afraid of the impact of hard objects, afraid of the main defects of sharp tools.
Savage use is not afraid of the fragility of the general framework, but of poor sharp weapons.
Reaction speed10ms15-24ms50-300ms10ms10-20ms.
Made of pure glass, the transparent shell of four-layer composite film is coated with glass and plexiglass.
Multi-touch intelligent judgment center point upper left corner center point center point
Optical interference does not have this problem. Without this problem, it is impossible to go beyond the scope. Without this problem, it would not have this problem.
Electromagnetic interference has no such problem, no such problem, no such problem, no such problem.
Dust-proof, not afraid, not afraid to block the light transmission part, not afraid.
Life span >; > 50 million semi-permanent times and 20 million times is too much, and the probability of sensor damage is 35 million times 1 10,000 times.
Installation risk is not fragile, fragile and easy to break. The shell is not fragile and easy to damage ITO.
The market repair rate is 0.21%40% 5% 30%
The appearance does not affect the appearance and the unevenness.
On-site maintenance does not require frequent calibration and cleaning of the shell.
1. Surface acoustic wave touch screen
This paper takes the E 1o Touch SAW touch screen of American E 1oTouch System Company as an example.
Surface acoustic wave (SAW) is a kind of ultrasonic wave, which is a kind of mechanical energy wave propagating on the surface of a medium (such as rigid materials such as glass or metal). Surface acoustic wave (SAW) is stable and easy to analyze, and has very sharp frequency characteristics in the process of shear wave propagation. In recent years, it has developed well in nondestructive testing, imaging and filtering.
The touch screen part of the surface acoustic wave touch screen can be a flat, spherical or cylindrical glass plate, which is installed in front of CRT, led, LCD or plasma display screen. This glass plate is just a pure tempered glass, which is different from other touch screen technologies in that there is no film and cover.
Vertical and horizontal ultrasonic transmitting transducers are fixed at the upper left corner and the lower right corner of the glass screen, and two corresponding ultrasonic receiving transducers are fixed at the upper right corner. The four sides of the glass screen are engraved with reflective stripes with a 45-degree angle from sparse to dense. See figure 1.
Figure: InteIliTouch touch screen includes a reinforced glass plate, and surface acoustic waves intersect in X and Y directions.
Taking the Y axis as an example, the transmitting transducer converts the 5MHz electrical signal generated by the controller into ultrasonic energy. The design of the transducer base makes it have a narrow direction angle to spread the energy attached to the acoustic surface to the left, and in the transmission process, it is reflected upward by the 45-degree reflection stripes at the bottom to spread to the uniform surface in the vertical direction of the screen surface, and then it is converged into a line by the reflection stripes at the top to spread to the Y-axis receiving transducer, and finally it is converted into an electrical signal and sent back to the controller.
The received signal is attenuated at the corresponding touch position.
When there is no touch, the waveform of the received signal is exactly the same as the reference waveform. When the finger touches the screen, the finger absorbs some acoustic energy, and the controller can calculate the position of the touch point on the Y axis by detecting the attenuation of the received signal at a certain moment, and the position of the touch point on the X axis can also be obtained by the same principle. (See Figure 2). In addition to the X and Y coordinates that the general touch screen can respond to, the SAW touch screen will also respond to its unique third axis Z axis coordinates, that is, it can sense the user's touch pressure. Its principle is calculated according to the attenuation of the received signal. Once the three axes are determined, the controller transmits them to the host. Because the surface acoustic wave technology is very stable, the controller of the surface acoustic wave touch screen calculates the touch position by measuring the position of the decay time on the time axis, so the surface acoustic wave touch screen is very stable and has high accuracy. At present, the precision of SAW technology touch screen is usually 4096×4096.
The advantages of SAW touch screen mainly include: the longest service life (the authoritative magazine of American electronic engineers reported that 50,000 times of touching the same position is trouble-free), semi-permanent products, excellent scratch resistance, the highest light transmittance (> 92%), clarity, clear and transparent image quality and no color distortion. These advantages come from the fact that its touch screen is pure glass, without any film and coating, unlike the touch screen with coated glass in the corner. In addition, the SAW touch screen technology has absolutely no drift, and it does not need calibration after installation. It directly adopts Ducal rectangular coordinate system, and the data conversion is not distorted.
As mentioned above, the surface acoustic wave touch screen also has a third axis Z axis, that is, the pressure axis response, because the greater the user touches the screen, the wider and deeper the attenuation gap on the received signal waveform. Among all touch screens, only the surface acoustic wave touch screen has the ability to sense touch pressure. With this function, each touch point is not only a digital switch state with and without touch, but also a perceptual analog switch. This function is very useful, for example, in multimedia information query software, a button can control the playback speed of animation or image.
See table 1 for the comparison of the above characteristics of SAW touch screen with other types of touch screens. It can be seen that it has great advantages, especially the touch screen that can withstand all kinds of rough touches, and is most suitable for use in public places. Public places are so destructive that no one can take care of them. So be sure to choose a durable touch screen.
. Resistive touch screen:
The main part of resistive touch screen is a resistive film screen which is very compatible with the display surface. It is a multi-layer composite film, with a layer of glass or plexiglass as the base layer, a transparent conductive layer called ITo on the surface, and a smooth scratch-resistant plastic layer on the outer surface. Its inner surface is also plated with a conductive layer (ITO or nickel gold), and there are many tiny (less than one thousandth of an inch) transparent isolation points between the two conductive layers. When a finger touches the screen, there is contact between the two conductive layers at the touch point. The controller detects this connection and calculates the positions of X axis and Y axis, which is the most basic principle of all resistive touch screens. See figure 3.
Figure 3. The structure of resistive touch screen and the principle of simulating resistive touch screen.
The two ITO working surfaces of the resistive touch screen must be complete. When silver glue is coated on both sides of each working face, the voltage at one end is 5V and the voltage at the other end is 0V, so that a uniform and continuous parallel voltage distribution can be formed in one direction of the working face. After the touch is detected, the analog voltage value of the contact point is measured by A/D conversion immediately, and the position of the contact point in this direction is calculated according to its proportional formula with 5V.
It is necessary to mention two kinds of transparent conductive coating materials here: ①ITO, oxidized steel and weak conductor, which are characterized by suddenly becoming transparent when the thickness drops below 1800 angstrom (angstrom = 10- 10 meter), and the transmittance is 80%, and when it is thinner, the transmittance drops to 300 angstrom. Unfortunately, ITO with this thickness is brittle and easy to break and crack. ITO is the main material used in all resistive touch screens and capacitive touch screens. In fact, the working surfaces of resistive and capacitive touch screens are coated with ITO. (2) Nickel-gold coating. The outer conductive layer of five-wire resistive touch screen is made of nickel-gold coating material with excellent ductility. Due to frequent contact, the outer conductive layer is made of nickel-gold material with good ductility to prolong its service life, but the cost is relatively high. Although the nickel-gold conductive layer has good ductility, it can only be used as a transparent conductor, which is not suitable for the working face of resistive touch screen, because the conductivity is too strong to measure the resistance accurately, and the thickness of metal is not easy to be very uniform.
In the first generation of four-wire resistance technology, a uniform voltage distribution field of 5V to 0V was applied to both ITO layers when they worked on the surface: one working surface was vertical and the other was horizontal. There are always four cables from the conductor to the controller. Because the outer plastic of four-wire resistive touch screen often contacts with ITO coating, after a period of time, the thin ITO coating on the outer layer will appear tiny cracks. Obviously, once there is a crack in the conductive working face, the current will bypass it, and the voltage field distribution on the working face will no longer be uniform. In this way, the touch screen drifts seriously near the crack, and after the crack increases, some areas of the touch screen may no longer be touched.
The base of four-wire resistive touch screen is mostly plexiglass, which not only has the problems of low transmittance, weathering and aging, but also has the installation risk. This is because the rigidity of plexiglass is poor, so you can't pinch the silver glue on the edge when installing, so as not to crack the thin ITO and the relatively thick silver glue, and you can't press or pull the touch screen hard to avoid breaking the ITO layer. It is for this reason that some four-wire resistive touch screens are uneven after installation.
ITO is inorganic, and plexiglass is organic. Organic matter and inorganic matter can't be well combined, and it is easy to peel off after a long time. If curved glass plate can be produced, which is inorganic and can be well combined with ITO to form conductive glass, wouldn't the life of resistive touch screen be greatly prolonged?
This conductive glass is used on the base of the second generation five-wire resistance technology touch screen. Moreover, the five-wire resistance technology applies voltage fields in two directions to the conductive working surface of glass through a precise resistance network. We can simply understand that the voltage fields in two directions are applied to the same working face in time-sharing, and the outer nickel-gold conductive layer is only used as a pure conductor. After touching, the position of the touch point is measured by detecting the voltage and conduction current of the internal ITO contact point. The ITO in the inner layer of the five-wire resistive touch screen needs four leads, and the outer layer only needs one conductor, so it needs five cables to the controller. Because the outer nickel-gold conductive layer of the five-wire resistance screen is not only malleable, but also only used as a conductor, as long as it is continuously split into two halves, it can still continue to complete the mission of the conductor, while the inner layer 1TO, which bears the heavy responsibility, directly combines with the base glass to become conductive glass, which naturally has no disadvantages of plexiglass as the base. Therefore, compared with the four-wire resistance screen, the service life and light transmittance of the five-wire resistance screen have leapt: the touch life of the five-wire resistance screen is 35 million times, while that of the four-wire resistance screen is less than 1 10,000 times, and there is no installation risk of the five-wire resistance screen. At the same time, the ITO layer of the five-wire resistance screen can be made thinner, so the transmittance and clarity are higher and there is almost no color distortion.
Whether it is a four-wire resistive touch screen or a five-wire resistive touch screen, it is completely isolated from the outside world and is not afraid of dust, water vapor and oil pollution. They can be touched by any object, can be used for writing and drawing, and are more suitable for limited people in industrial control fields and offices. The disadvantage of resistive touch screen is that the outer layer of composite film is made of plastic, and people who don't know it may scratch the whole touch screen with excessive force or touch it with sharp tools, resulting in scrapping. However, in the limit range, scratches will only hurt the outer conductive layer, which has nothing to do with the five-wire resistive touch screen, but is fatal to the four-wire resistive touch screen.
Touch screen based on capacitance technology;
Capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are coated with a layer of ITO, and the outermost layer is a protective layer of Shi Ying glass, with a thickness of only 0.00 15mm. Interlayer ITO coating is used as working surface, and four electrodes are led out from four corners. The inner ITO is the shielding layer, which ensures a good working environment.
When the user touches the capacitive screen, the user's finger forms a coupling capacitance with the working surface due to the electric field of the human body. Because the working surface is connected with high-frequency signals, the current absorbed by the finger is very small. This current flows from the electrodes at the four corners of the touch screen. Theoretically, the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point by accurately calculating these four current ratios, as shown in Figure 4.
Figure 4. The position of the touch point is calculated by comparing four currents.
The transparency and clarity of capacitive touch screen are better than those of four-wire resistance screen, but not as good as those of surface acoustic wave screen and five-wire resistance screen. See table 1 and figure 5. Capacitive touch screen is seriously reflective. Moreover, the four-layer composite touch screen using capacitance technology has uneven light transmittance at various wavelengths, resulting in color distortion. Because of the reflection of light between layers, image characters are blurred.
Figure 5. Why is the capacitive touch screen less reflective, transparent and clear than the acoustic flash screen?
In principle, the capacitive screen uses the human body as the electrode of the capacitive element. When the conductor is close to the capacitor coupled to the ITO working surface of the interlayer, the current flowing away is enough to cause misoperation of the capacitive screen. We know that although the capacitance is inversely proportional to the electrode spacing, it is directly proportional to the relative area, and it is also related to the dielectric insulation coefficient. Therefore, when the palm or hand-held conductor is close to the capacitive screen in a large area instead of touching it, it will cause misoperation of the capacitive screen, especially in wet weather. Holding the display screen by hand, with the palm close to the display screen within 7 cm or the body close to the display screen 15 cm, may lead to misoperation of the capacitive screen.
Another disadvantage of capacitive screen is that there is no response when a gloved hand or a non-conductive object touches it, because a more insulating medium is added.
The main disadvantage of capacitive screen is drift: when the environmental temperature and humidity change and the environmental electric field changes, it will cause the capacitive screen to drift and cause inaccuracy. For example, the display will drift when the temperature rises after turning on: when the user touches the screen, his other hand or one side of his body will drift near the display; The capacitive screen corrected by a young man of more than 70 kg may not be touched by a young lady of 40 kg (just shake hands with two young ladies); Large objects near the capacitive touch screen will drift after being moved, and if someone comes around to watch when you touch them, it will also drift; The reason of capacitive screen drift belongs to technical congenital deficiency. Although the environmental potential surface (including the user's body) is far away from the capacitive touch screen, it is much larger than the finger area, which directly affects the determination of the touch position. In addition, in theory, many relationships should be linear, but in fact they are nonlinear. For example, people with different weights or different finger wetting degrees inhale different amounts of total current, but the changes of total current and four partial currents are nonlinear. The four-corner custom polar coordinate system used in capacitive touch screen has no coordinate origin, so the controller cannot detect and recover after drift. Moreover, after the four A/D are completed, the values of the four partial currents are at right angles to the touch point. Because there is no origin, the drift of capacitive screen is cumulative, and calibration is often needed in the workplace.
There was an accident in American casinos: at that time, all bingo machines were equipped with capacitive touch screens, and one guest was lucky enough to attract many onlookers, but I didn't expect that the capacitive touch screen failed because of the serious change of environmental electric field. Later, the casino completely changed to use surface acoustic wave touch screen to restore its reputation, but this incident can reflect the inherent deficiency of capacitive touch screen technology.
The silicon dioxide protective glass on the outermost layer of capacitive touch screen has good scratch resistance, but for fear of nails or hard objects, knocking out a small hole will hurt the interlayer ITO. No matter whether the interlayer ITO or the ITO layer on the inner surface is damaged during installation and transportation, the capacitive screen will not work normally.
Infrared touch screen uses dense infrared matrices in X and Y directions to detect and locate the user's touch. Usually, the infrared touch screen is equipped with an outer frame in front of the display, and the infrared emitting tube and the infrared receiving tube are arranged on the four sides of the screen by means of a circuit board hidden in the outer frame, forming an infrared matrix criss-crossing. When the user touches the screen, his fingers will block the two infrared rays passing through the position, so that the position of the touch point on the screen can be judged, as shown in Figure 6.
Figure 6. Principle of infrared scanning touch screen
The method of installing infrared touch screen is very simple, as long as the frame is fixed in front of the display with glue or double-sided tape. Most infrared touch screen controllers are directly designed on the circuit board hidden in the frame, and some infrared touch screens design the controllers in a separate box. The controller communicates directly with the host through the keyboard interface or serial port, and the infrared touch screen user who takes the keyboard interface can even read the touch screen data directly from the keyboard interface without any driver.
The resolution of infrared touch screen is determined by the number of infrared tubes in the frame, so the resolution is low, mainly 32×32 and 40×32 in the market.
The main disadvantage of the original infrared touch screen is that it is sensitive to the lighting environment factors because it works with infrared light, and it will misjudge or even crash when the lighting changes greatly. After the introduction of the second-generation anti-light interference infrared touch screen in China, the second-generation infrared touch screen has overcome this weakness well, but after all, the infrared touch screen works by infrared light and can only bear limited light interference, so it has certain limitations in the use environment.
Another main disadvantage of infrared touch screen is the frame: unsightly and luxurious, which destroys the original appearance of the display; It requires an infrared filter inside the mirror frame; In addition, this frame is not strong. According to the maintenance situation, the frame of infrared touch screen is the most easily damaged.
Third, excellent quality touch-EloTouch products.
Elo TouchSystems Company Profile:
Elo TouchSystems, formerly known as E1Graphics, is the largest touch screen manufacturer in the world. Its parent company Ruikai Company focuses on material technology, and its products are widely used in the fields of post and telecommunications, electric power, aviation, aerospace, military industry, petrochemical industry and so on.
Elo TouchSystems has been committed to the research and development of touch screens since 197 1, and has been in a leading position in the field of touch screen technology development. The company took the lead in developing resistive touch screen, and introduced a brand-new surface acoustic wave technology touch screen to the market on 1987. E 1o Touchsystems has obtained patents for these two technologies. That is, the surface acoustic wave touch screen technology and five-wire resistance touch screen technology introduced earlier.
As a part of the company's total quality management, every employee of E 1o TouchSystems is committed to further improving production and after-sales service. The company has the potential of mass production, detailed technical support and legally authorized agents distributed all over the world.
Millions of people learn, get information and control complex processes by touching Elo's touch screen. As predicted by E 1o TouchSystems, it is increasingly obvious that the touch screen is the most intuitive, friendly and simple input device in the world.
E 1o touch screen provides such a direct and convenient connection between users and applications. With the help of multimedia technology and computer graphic interface, it has been widely used in various application fields and popularized all over the world. One of the reasons for the success of E 1o touch screen includes developing drivers for users of various operating systems and providing extensive support, such as DOS, os/2 and Windows3. X, Windows95, Windows NT, UNIX and apple Macintosh.
E 1o touch screen users can also choose plug-and-play touch screen, which can be used out of the box; You can also choose a touch screen kit (including touch screen, control card, cable and supporting software) for professionals to install on the user's display. All kinds of ordinary monitors and monitors are equipped with matching touch screens, and special monitors can also customize touch screens for users.
Elo TouchSystems has a full range of touch screen models: flat, cylindrical or spherical CRT tubes, LED array electroluminescent displays, LCD liquid crystal displays and plasma displays, and most sizes from 8 inches to 2 1 inch are in stock, and special sizes can also be customized according to user requirements.
ELO product introduction
Surface acoustic wave touch screen: (intelligent touch)
Surface acoustic wave touch screen is a completely transparent touch screen, which can sense pressure like position. The screen is a piece of pure glass without any film and coating. Because the user only touches the glass directly, it is especially suitable for public places. For example, shopping guide or automatic kiosk with TV, office automation, etc. ELO's standard 1 tell itouch touch screen has a resolution of 4096×4096, and the all-glass touch screen has excellent light transmittance. The main advantages are no drift, high precision and scratch resistance.
Five-wire resistive touch screen (AccuTouch):
Five-wire resistive touch screen adopts internationally renowned patented resistance technology, including a glass screen molded by molding and a transparent scratch-resistant plastic layer. This kind of touch screen is especially suitable for applications that need high-precision touch screen, with an accuracy of over 4096×4096, excellent definition and tiny parallax.
Compared with other types of touch screens, the five-wire resistive touch screen has the following advantages: no drift, high precision, fast response, touch with fingers or other objects, dust prevention and oil prevention. Mainly used for professional engineers or industrial sites.
Controller:
ELO's touch screen has designed a complete controller series to adapt to various computers and single chip microcomputer systems. The controller of AccuTouch touch screen can choose RS-232 serial port, ISA bus card, MCA bus card or provide its latest monolithic integrated chip SmartSet to make the controller. Intellitouch touch screen provides various controllers, Smartset chip with serial port, ISA bus card and App 1e desktop MAC bus card.
The control provides a touch screen signal source, convert that received analog signal into digital coordinates, and sends the coordinate to the host. The controller is not only made into a card, but also into a display and a separate outer box (the longest 100 meter).
Application software development tool
Elo TouchSystems has developed a set of touch screen software, which can help users to quickly install and establish touch screen drivers.
Using one of the registered trademark touch screen drivers of MonitorMouse, users can immediately start using the ELO touch screen on the basis of the existing mouse drivers in their operating systems (windows, windows NT, OS/2, DOS, UNIX and App 1e Macintosh). As long as the application supports the mouse, the touch screen can be used directly without any development, and the mouse and keyboard are still used as usual. We also provide application software development tools to help users add touch function to existing software, whether in graphic mode or text mode.
ELO's other development tools provide users with various software packages, allowing users to apply the latest movie animation, multimedia information and graphic skills to their applications. Using these tools, developers all over the world have developed countless low-cost and high-efficiency software with rich and varied interfaces that support touch screens.
Optional driver software
Operating system software driver
————————————————————————————————————————
The display based on DOS/ mouse simulates the mouse driven by DOS mouse.
TOUCHBACK is based on the keyboard and imitates the keyboard driver. It is recommended to use it under the software with keyboard driver such as DBASE, CA-CLIPPER and BASIC. TOUCHUP is needed to define the correspondence between the touch area and the keyboard.
ELODRV touch screen driver, a software that does not support mouse, is soft for the development of new C, C++, Pascal and assembly languages.
A single touch screen device can be directly driven by a single touch screen, and the touch area needs to be defined by TouchUp.
Windows monitor windows mouse
Windows nt monitor mouse for windows nt (only applicable to the host of Intel CPU)
Operating System /2 Monitor Mouse for Operating System /2
Apple computer monitor Apple computer mouse
Amiga commodore- provided by amiga manufacturer.
UNIX UNIX touch screen driver
Others directly contact Huanxing Touch Computer Co., Ltd. or local agent service providers for technical support.
Note: E 1o Touchsystems provides a set of drivers and development tools to adapt to various system environments. This table helps users to choose the driver that is most suitable for users to develop and apply software platforms.
Five, the typical application of touch screen
Typical application occasions
★ Education and training ★ Program control
★ Factory Automation and Industrial Control★ Automatic Testing
★ Financial accounting treatment★ Medical devices
★ Multimedia information query★ Sales management
☆ Open information ☆ Automatic sales.
☆ Management information ☆ Restaurant KTV
☆ Product and corporate image introduction ☆ Electronic games
★ Automated Aviation System★ Troops
★ Sanjin Project
Karaoke computer song ordering system shopping mall shopping guide system post office business and postal code inquiry
Library inquiry system, medical monitoring system, securities trading inquiry system.
Real estate sales system leading office system bank inquiry system
ATM Handwritten Input and Handwritten Signature Recognition in Decision Command System
Early childhood education airport, station inquiry insurance business inquiry
Tax information inquiry meeting information inquiry hotel management and lobby inquiry
Mature touch screen application software in domestic market
Telephone inquiry system of telecommunication bureau, museum visiting system, underground pipeline gas maintenance system.
Postal service inquiry system, tourist attractions guide system, underground cable maintenance system.
Electric power bureau electricity fee inquiry system urban comprehensive information inquiry system large warehouse inquiry system
Bank public business inquiry system, file information inquiry system, laws and regulations inquiry software
Tax bureau leader inquiry system personnel inquiry system patent inquiry software
Government Chief Economic Information Inquiry System Talent Matchmaker Inquiry System Trademark Inquiry Software
Bank leaders' information inquiry system Kara 0K Kara ok system Enterprise registration inquiry software of the Industrial and Commercial Bureau
CPPCC national Committee economic information inquiry system public security household registration inquiry system library inquiry software
Exhibition guide system, public security criminal wanted order query, art museum query software.
Shopping mall shopping guide inquiry system enterprise leader information inquiry system enterprise financial inquiry software
Sports competition information inquiry system, military action command system, insurance business inquiry software.
Hotel lobby information inquiry system, hospital tour guide system, enterprise inventory inquiry software.
Airport traffic information inquiry system, hospital outpatient inquiry system, customs business inquiry software.
Train frequency inquiry system, securities information inquiry system, real estate sales system.
Large-scale construction group tourism inquiry system, golf tourism system and automobile sales software
Corporate image display system, port navigation system
Project application
Vlddeotex videotex G 1S car navigation system
Handwritten Chinese character recognition system controlled by machine tool
Electric power dispatching command
Metallurgical dispatching command medical equipment
Fire fighting equipment control petrochemical simulation control equipment
Restaurant ordering game machine
Telecommunication Bureau 1 14 Telephone Number Inquiry Factory Simulation Training System
Bowling lane scoring system controlled by telephone exchange