Technical analysis and market application of touch screen
2. Introduction to the principles of touch screen technology
3. Excellent quality touch screen - E1oTouch product
5. Typical applications of touch screens
2. Introduction to the principles of touch screen technology
The touch screen is the most convenient, simple and natural input method. People who do not understand computers at all can operate the computer right away. The user looks at the displayed content and simply touches it with his hand if he wants to select something. Through the touch screen, people can browse your application software and query the information they are interested in.
Since the touch screen is the most suitable input device for information inquiry, developed countries are actively engaged in the research and development of touch screens. Just as PCs have developed from 286 and 386 to Pentium machines, touch screens have also developed from low-end to high-end. , from infrared and resistive to capacitive sensing, and now to surface acoustic wave touch screens and five-wire resistive touch screens. The performance is becoming more and more reliable, and the technology is becoming 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 film coating. Both the clarity and durability indicate the era of mature touch screen products. arrival.
This chapter mainly provides a detailed introduction to the surface acoustic wave touch screen, resistive touch screen, capacitive sensing touch screen, and infrared touch screen technologies currently on the domestic market. Although the news of the suspension of production of the famous overseas TPIS infrared touch screen came in early 1995, in a short period of time, various domestic players will balance their strength with price and coexist in the domestic market for a period of time.
Due to the characteristics of the touch screen itself, in addition to being very transparent and accurately positioned, the requirements for the touch screen also require it to remain accurate for a long time, work stably and reliably, not affect the appearance, and not be easily damaged. Therefore, judging the pros and cons of a touch screen technology is mainly based on these points.
First, a relatively simple list of the characteristics of various types of touch screens is as follows:
Category
Performance
Surface Acoustic Wave
Capacitor
Infrared
Five-wire resistor
Four-wire resistor
Definition is very good, character image is blurred, character image is better Blur
Reflectivity Rare Serious Yes Rare
Light transmittance 92 (limit) 85 75 55
Color distortion None Yes No Yes
Resolution 4096×4096 1024×1024 40×32 4096×4096 1024×1024
Influence of pressure axis Yes No No No No
Drift No Drift No No No
p>Anti-scratch Very good and not afraid of hard objects Average, afraid of being hit by hard objects Average, afraid of sharp objects Main defects
Rough use Not afraid of average The outer frame is fragile Good, but afraid of sharp objects Poor
Response speed 10ms 15-24ms 50-300ms 10ms 10-20ms
Material Pure glass Four-layer composite film Translucent shell Coated on glass Coated on organic glass
Multi-touch intelligent judgment Center point Upper left corner Center point Center point
Light interference No such problem No such problem Cannot exceed the range No such problem No such problem
Electromagnetic field interference No such problem Yes There is no such problem There is no such problem There is no such problem
Dust-proof Not afraid Not afraid Cannot block the light-transmitting part Not afraid Not afraid
Lifespan gt; gt; 50 million times Semi-permanent 20 million times Too many sensors are more likely to be damaged 35 million times 1 million times
Installation risk Not fragile Fragile Easily broken shell Not fragile Easily damaged ITO
Market repair rate 0 21 40 5 30
Appearance No impact No impact Impact on appearance No impact Uneven
On-site maintenance Not required Frequent calibration is required Cleaning the shell Not required Not required
1. Surface Acoustic Wave Touch Screen
This article takes the E1oTouch surface acoustic wave touch screen of the American E1o TouchSystems company as an example.
Surface acoustic wave, a type of ultrasonic wave, is a mechanical energy wave that propagates shallowly on the surface of a medium (such as rigid materials such as glass or metal). Surface acoustic waves have stable performance, are easy to analyze, and have very sharp frequency characteristics during shear wave transmission. In recent years, they have become very mature in the fields of non-destructive testing, imaging and filters.
The touch screen part of the surface acoustic wave touch screen can be a flat, spherical or cylindrical glass plate, installed in front of a CRT, LED, LCD or plasma display screen. This glass panel is just a piece of pure tempered glass. What distinguishes it from other touch screen technologies is that it does not have any film or covering layer.
Vertical and horizontal ultrasonic transmitting transducers are fixed on the upper left and lower right corners of the glass screen, and two corresponding ultrasonic receiving transducers are fixed on the upper right corner. The four peripheries of the glass screen are engraved with very precisely spaced reflection stripes at 45-degree angles from sparse to dense. See Figure 1.
Picture: The InteIliTouch touch screen includes a strengthened glass plate with surface acoustic waves crossing in the X and Y directions.
Taking the Y axis as an example, the transmitting transducer handles The 5MHz electrical signal generated by the controller is converted into ultrasonic energy and emitted. The design of the transducer base makes it have a narrow direction angle to propagate the acoustic surface adhesive energy to the left. During the transmission process, it is reflected upward by the 45-degree reflection stripe on the bottom edge to spread uniformly in the vertical direction of the screen surface. Then it is gathered to the right by the upper reflection stripe and propagated to the Y-axis receiving transducer, and finally converted into an electrical signal and sent back to the controller.
The received signal attenuates at the location corresponding to the touch position
When there is no touch, the waveform of the received signal is exactly the same as the reference waveform. When a finger touches the screen, the finger absorbs part of the sound wave energy, and the controller detects the attenuation of the received signal at a certain moment, and can calculate the position of the touch point on the Y-axis. The same principle can be used to obtain the touch The position of the point on the X-axis. (See Figure 2) In addition to the X and Y coordinates that general touch screens can respond to, the surface acoustic wave touch screen also responds to its unique third-axis Z-axis coordinate, which is the value of the user's touch pressure. The principle is calculated from the attenuation of the received signal attenuation. Once the three axes are determined, the controller sends them to the host. Because surface acoustic wave technology is very stable, and the controller of the surface acoustic wave touch screen calculates the touch position by measuring the position of the attenuation moment on the time axis, the surface acoustic wave touch screen is very stable and has very high accuracy. The accuracy of the current surface acoustic wave technology touch screen is usually 4096×4096.
The main advantages of the surface acoustic wave touch screen are: the longest life (the authoritative American electronic engineer magazine reports: 50,000 touches at the same position without failure), a semi-permanent product, and excellent anti- It has the highest light transmittance (>92%) and clarity, maintaining clear and translucent image quality without color distortion. These advantages come from the fact that its touch screen is pure glass without any film or coating, and it is not like a glass with a coating. When a laminated glass touch screen is subjected to pressure at the corners, unpredictable internal stress may be concentrated somewhere. Therefore, the installation risk of a pure glass touch screen is small; in addition, the surface acoustic wave touch screen technology has absolutely no drift, and there is no need to calibrate it after installation. It can be used directly Cartesian coordinate system, data conversion without distortion.
As mentioned earlier, the surface acoustic wave touch screen also has a third-axis Z-axis, which is the pressure axis response. This is because the greater the force the user touches the screen, the wider the attenuation gap on the received signal waveform will be. The deeper. Among all touch screens, only surface acoustic wave touch screens have the ability to sense touch pressure. With this function, each touch point is not just two digital switch states of touch and no touch, but becomes an analog of perceptibility. The value is switched on and off. This function is very useful. For example, in multimedia information query software, a button can control the playback speed of animations or images.
For a comparison of the above characteristics of the surface acoustic wave touch screen and other types of touch screens, see Table 1. From the comparison, you can see its greater advantages, especially its ability to withstand various rough touches and is most suitable for facing public** Touch screen applications in public places are very destructive and cannot be guarded by dedicated personnel. Therefore, you must choose a durable touch screen.
. Resistive technology touch screen:
The main part of the resistive touch screen is a resistive film screen that is very suitable for the display surface. This is a multi-layer composite film composed of a layer of glass. Or organic glass as the base layer, the surface is coated with a transparent conductive layer called ITo, which is then covered with an outer surface hardened, smooth and scratch-resistant plastic layer, and its inner surface is also coated with a conductive layer (ITO or nickel gold) , there are many small (less than one thousandth of an inch) transparent isolation points between the two conductive layers to separate them and insulate them. When a finger touches the screen, the two conductive layers have a contact at the touch point. The controller detects this connection and calculates the position of the X and Y axes. This is the most common feature of all resistive technology touch screens. Basic principles. See Figure 3.
Figure 3. The structure of the resistive touch screen and the principle of the analog resistive screen
The two-layer ITO working surface of the resistive touch screen must be complete. Apply a strip of silver glue on the two sides of each working surface, and add 5V to one end. Voltage, adding 0V to one end can form a uniform and continuous parallel voltage distribution in one direction of the working surface. After detecting a touch, the analog voltage value of the contact point is immediately measured through A/D conversion, and the position of the touch point in this direction can be calculated based on the proportional formula between it and 5V.
It is necessary to mention two transparent conductive coating materials here: ①ITO, oxidized steel, weak conductor, the characteristics are when the thickness drops below 1800 angstroms (angstroms = 10-10 meters) It will suddenly become transparent, with a light transmittance of 80%. The light transmittance will decrease when it becomes thinner, and rise to 80% when the thickness reaches 300 angstroms. Unfortunately, ITO is very brittle at this thickness and can easily break and cause cracks. ITO is the main material used in all resistive technology touch screens and capacitive technology touch screens. In fact, the working surface of resistive and capacitive technology touch screens is the ITO coating. ②Nickel-gold coating, the outer conductive layer of the five-wire resistive touch screen uses a nickel-gold coating material with excellent ductility. Due to frequent touching, the purpose of using a nickel-gold material with good ductility for the outer conductive layer is to extend the 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 and is not suitable as a working surface for resistive touch screens. Because it has too good conductivity, it is not suitable for precise resistance measurement, and the metal is not easy to achieve thickness. Very even.
The two-layer ITO working surface of the first generation four-wire resistor technology is applied with a uniform voltage distribution field of 5V to 0V when working: one working surface is applied in the vertical direction, and the other working surface is added in the horizontal direction. . Four cables are required to route the leads to the controller mains. Because the outer plastic and ITO coating of the four-wire resistive touch screen are frequently touched, the thin outer ITO coating will have small cracks after a period of time. Obviously, once there are cracks on the conductive working surface, the current will will bypass it, and the voltage field distribution on the working surface will no longer be uniform. In this way, the touch screen will drift seriously near the cracks. After the cracks increase, some areas of the touch screen may no longer be touchable.
Most of the base layers of four-wire resistive touch screens are plexiglass, which not only has problems with low light transmittance, weathering, and aging, but also has installation risks. This is because plexiglass has poor rigidity and cannot be pinched during installation. silver glue on the touch screen to prevent the thin ITO and relatively thick silver glue from cracking. Do not press or pull the touch screen hard to avoid breaking the ITO layer. Some four-wire resistive touch screens appear uneven after installation for this reason.
ITO is an inorganic substance, and plexiglass is an organic substance. Organic substances and inorganic substances cannot be combined well, and they will easily peel off over time. If a curved glass plate could be produced. Glass is an inorganic substance and can be combined with ITO very well to form conductive glass. Wouldn't the life of the resistive touch screen be greatly extended?
The base layer of the second-generation five-wire resistance technology touch screen uses this kind of conductive glass. Not only that, the five-wire resistance technology adds voltage fields in both directions to the conductive work of the glass through a precision resistor network. On the surface, we can simply understand that the voltage fields in two directions are applied to the same working surface in time, and the outer nickel-gold conductive layer is only used as a pure conductor. There is a touch back to detect the inner ITO contact. The position of the touch point is measured by detecting the point voltage and the conduction current. The five-wire resistive touch screen requires four leads in the inner layer of ITO, and only one conductor in the outer layer. It requires 5 cables to the controller. Because the outer nickel-gold conductive layer of the five-wire resistive screen not only has good ductility, but also only acts as a conductor. As long as it continues to be divided into two halves, it can still continue to complete its mission as a conductor, and the inner layer 1TO, which bears the heavy responsibility, is directly connected to the base layer. The glass is combined into one body to become conductive glass. Conductive glass naturally does not have the disadvantages of organic glass as the base layer. Therefore, the service life and light transmittance of the five-wire resistive screen have made a leap compared with the four-wire resistive screen: the five-wire resistive screen The touch life of the five-wire resistive screen is 35 million times, while the four-wire resistive screen is less than 1 million times. The five-wire resistive touch screen has no installation risk. At the same time, the ITO layer of the five-wire resistive screen can be made thinner, so the light transmittance and higher clarity with almost no color distortion.
Whether it is a four-wire resistive touch screen or a five-wire resistive touch screen, they are a working environment that is completely isolated from the outside world. They are not afraid of dust, water vapor and oil. They can be touched by any object and can be used. For writing and drawing, it is more suitable for use by limited people in industrial control fields and offices.
The biggest disadvantage of resistive touch screens is that because the outer layer of the composite film is made of plastic material, someone who doesn't know it may scratch the entire touch screen if they touch it too hard or use a sharp object, causing it to be scrapped. However, within limits, scratches will only damage the outer conductive layer. Scratches on the outer conductive layer do not matter for five-wire resistive touch screens, but are fatal for four-wire resistive touch screens.
Capacitive technology touch screen:
The capacitive technology touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are each coated with a layer of ITO, and the outermost layer is only 0.0015 The millimeter-thick silica glass protective layer and the interlayer ITO coating serve as the working surface. Four electrodes are drawn from the four corners, and the inner ITO layer serves as the shielding layer to ensure a good working environment.
When the user touches the capacitive screen, due to the electric field of the human body, the user's finger and the working surface form a coupling capacitance. Because the working surface is connected to a high-frequency signal, the finger absorbs a very small current. This current flows out from the electrodes on the four corners of the touch screen, and theoretically the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the touch point through precise calculation of the ratio of these four currents. For the location, see Figure 4.
Figure 4. Calculate the touch point position by comparing four currents
The transmittance and clarity of the capacitive touch screen are better than those of the four-wire resistive screen. Of course, they cannot be compared with the surface acoustic wave screen and the five-wire resistive screen. See the table 1 and Figure 5, the capacitive screen is seriously reflective, and the four-layer composite touch screen with capacitive technology has uneven transmittance of light of various wavelengths, causing color distortion. Due to the reflection of light between the layers, it also causes distortion of the image characters. Vague.
Figure 5. Why does the capacitive touch screen reflect light and have lower light transmittance and clarity than the acoustic screen
In principle, the capacitive screen uses the human body as an electrode of a capacitor element. When a conductor is close to the interlayer ITO, it works When a capacitor of sufficient capacitance is coupled between the surfaces, the current flowing away is enough to cause the capacitive screen to malfunction. We know that although the capacitance value is inversely proportional to the distance between the poles, it is directly proportional to the relative area, and is also related to the insulation coefficient of the medium. Therefore, when a large area of ????the palm or a conductive object is held close to the capacitive screen instead of touching it, it can cause the capacitive screen to malfunction. In humid weather, this situation is particularly serious. Putting your body within 15 cm of the monitor can cause the capacitive screen to malfunction.
Another disadvantage of capacitive screens is that they do not respond when touched with gloved hands or non-conductive objects. This is due to the addition of a more insulating medium.
The main disadvantage of capacitive screens is drift: when the ambient temperature and humidity change, or the environmental electric field changes, it will cause the capacitive screen to drift, causing inaccuracy. For example, the temperature of the monitor rises after the power is turned on, causing drift: the user touches the screen while the other hand or side of the body is close to the monitor and the screen drifts; a capacitive screen calibrated by a 70-kg boy may not be touched by a 40-kg lady (two Just hold the lady's hand); Large objects near the capacitive touch screen will drift after being moved, and if someone comes around to watch when you touch it, it will also cause drift; the reason for the drift of the capacitive screen is due to inherent technical shortcomings and the environmental potential surface (including the user Although the body is far away from the capacitive touch screen, it is much larger than the finger area. They directly affect the determination of the touch position. In addition, many relationships that should be linear in theory are actually non-linear. For example, people with different weights or fingers with different degrees of wetness draw different total currents, and the changes in the total current and the changes in the four partial currents It is a non-linear relationship. The four-corner custom polar coordinate system used by the capacitive touch screen does not have an origin on the coordinates. The controller cannot detect and recover after drifting. Moreover, after the four A/Ds are completed, the four points are The calculation process from the flow value to the X and Y coordinate values ??of the touch point on the rectangular coordinate system is complicated. Since there is no origin, the drift of the capacitive screen is cumulative and calibration is often required at the job site.
Such an accident once occurred in a casino in the United States: Bingo machines at that time were all equipped with capacitive touch screens. One customer had good fortune and attracted many onlookers, but he did not expect that at this time Capacitive touch screens fail due to severe changes in the environmental electric field. The casino later restored its reputation by using surface acoustic wave touch screens, but this incident can reflect the inherent shortcomings of the technical principles of capacitive touch screens.
The outermost silica protective glass of the capacitive touch screen is very scratch-resistant, but it is afraid of being hit by nails or hard objects. Knocking a small hole will damage the interlayer ITO, regardless of whether it is the interlayer. If the ITO layer on the inner surface is damaged during installation and transportation, the capacitive screen will not work properly.
The infrared touch screen uses a dense infrared matrix in the X and Y directions to detect and locate the user's touch. Usually an infrared touch screen is installed with an outer frame in front of the display. The circuit board hidden in the outer frame arranges infrared transmitting tubes and infrared receiving tubes on the four sides of the screen, corresponding to each other to form a horizontal and vertical infrared matrix. When the user touches the screen, his finger blocks the horizontal and vertical infrared rays passing through that location, so the location of the touch point on the screen can be determined, as shown in Figure 6.
Figure 6. The principle of infrared scanning touch screen
The method of installing the infrared touch screen is very simple, just use glue or double-sided tape to fix the frame in front of the monitor. The controller of most infrared touch screens is designed directly on the circuit board hidden in the frame, and there are also infrared touch screens that design the controller in a separate small box. The controller communicates directly with the host through the keyboard interface or serial port. Users of infrared touch screens using the keyboard interface can even directly read the touch screen data sent from the keyboard interface without any driver.
The resolution of the 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 on the market.
It turns out that the main disadvantage of the infrared touch screen is that it relies on infrared light to work and is sensitive to lighting environment factors. When the lighting changes greatly, it will misjudge or even crash. After the launch of the second generation of domestic anti-light interference infrared touch screens, the second generation infrared touch screens have better overcome this weakness. However, after all, infrared touch screens work through infrared light and can only withstand limited light interference. Therefore, in the use environment There are certain restrictions on it.
Another major disadvantage of the infrared touch screen is the frame: it is not beautiful and luxurious, and destroys the original appearance of the display; it requires an infrared color filter inside the frame; in addition, the frame cannot be strong. According to the repair situation, The frame of an infrared touch screen is most susceptible to damage.
3. Excellent quality touch--EloTouch products
Introduction to Elo TouchSystems:
Elo TouchSystems, formerly known as E1ographics, is the world's largest touch screen developer and The manufacturer, whose parent company, RayChem, specializes in materials technology, and its products are widely used in post and telecommunications, electric power, aviation, aerospace, military, petrochemical and other fields.
Elo TouchSystems has been committed to the research and development of touch screens since 1971, and has always been a leader in technology development in the field of touch screens. The company took the lead in developing a resistive technology touch screen, and in 1987 introduced a new technology touch screen - surface acoustic wave technology touch screen to the market. E1o Touchsystems has obtained patents for these two technologies. That is, the surface acoustic wave touch screen technology and five-wire resistive touch screen technology introduced earlier.
As part of the company's extensive total quality management, every E1o TouchSystems employee is committed to further improving production and after-sales service. The company itself has the potential for mass production, thorough and detailed technical support and legally authorized agents distributed around the world.
Millions of people are learning, obtaining information, and controlling complex processes by touching Elo's touch screens. As E1o TouchSystems foresees, people are increasingly aware that touch screens are the most intuitive, user-friendly and simplest input devices in the world.
The E1o touch screen provides such a direct and convenient connection between users and applications. It cooperates with multimedia technology and computer graphics interface to achieve amazing effects. It has been widely used in various application fields and has been popularized all over the world. One of the reasons for the success of the E1o touch screen includes the development of drivers for users of various operating systems, providing extensive support: such as DOS, os/2, Windows 3.X, Windows 95, Windows NT, UNIX and Apple Macintosh.
E1o touch screen users can also purchase plug-and-play touch monitors that can be used right out of the box; they can also purchase touch screen kits (including: a touch screen, control card, cables, and supporting software) for professional Personnel is installed on the user's monitor. Various common displays and monitors are provided with matching touch screens, and special displays can also customize touch screens for users.
Elo TouchSystems has a full range of touch screen models: whether it is a flat, cylindrical or spherical CRT picture tube, an LED array electroluminescent display, an LCD liquid crystal display, or a plasma luminescent display. Moreover, most sizes from 8 inches to 21 inches are in stock, and special sizes can also be mass-customized according to user requirements.
ELO product introduction
Surface acoustic wave touch screen: (IntelliTouch)
The surface acoustic wave touch screen is a completely transparent touch screen that can sense pressure as well as position. . The screen is a pure piece of glass without any film or coating. Because the user directly contacts only the glass, it is especially suitable for public places. For example, shopping mall shopping guides or automatic kiosks with TVs, office automation, etc. ELO's standard 1intelliTouch touch screen resolution is 4096×4096. This touch screen made of all-glass material has excellent light transmittance. The main advantages are no drift, high precision and anti-scratch.
Five-wire resistive touch screen (AccuTouch):
The five-wire resistive touch screen uses internationally highly rated resistive patented technology: including a compression molded glass screen and a layer of transparent anti- Scratch the plastic. This type of touch screen is particularly suitable for applications that require high-precision touch screens, with an accuracy exceeding 4096×4096, excellent clarity and minimal parallax.
Compared with other types of technology touch screens, the main advantages of five-wire resistive technology touch screens are: no drift, high precision, fast response, can be touched with fingers or other objects, dust-proof and oil-proof, etc. For professional engineers or industrial sites.
Controller:
ELO's touch screen has designed a complete series of controllers to adapt to various computer and microcontroller systems. The AccuTouch touch screen controller can choose RS-232 serial port, ISA bus plug-in card, MCA bus plug-in card or provide its latest single-chip integrated chip SmartSet. The user can make the controller independently; Intellitouch touch screen provides serial port, Several controllers and Smartset chips for ISA bus plug-in cards and App1e Desktop Macintosh bus plug-in cards.
The controller provides a touch screen signal source, converts the received analog signal into digital coordinates, and sends the coordinates to the host at the same time. The controller is not only made into a plug-in card, but also built into the monitor and made into a separate external box (up to 100 meters away).
Application software development tools
Elo TouchSystems has developed a complete set of software for touch screens that can help users quickly install and create touch screen drivers.
Using one of the MonitorMouse registered trademark touch screen drivers, users can build on their existing mouse drivers for their operating systems (Windows, Windows NT, OS/2, DOS, UNIX and App1e Macintosh) , start using the ELO touch screen immediately. As long as the application supports a mouse, the touch screen can be used directly without any development, and the mouse and keyboard can be used as usual. We also provide application software development tools to help users add touch functionality to their existing software, whether in graphical or text format.
ELO also provides development tools to provide users with a variety of software packages, allowing users to incorporate the latest movie animation, multimedia information and graphics techniques into applications. Developers around the world have used these tools to develop countless software with rich and diverse interfaces that support touch screens at low cost and high efficiency.
Selectable driver software
Operating system software driver
———————————————————— ——————————————————————
DOS/ Based on mouse MonitorMouse for Dos imitation mouse driver
Based on keyboard TOUCHBACK imitation keyboard driver , it is recommended to use it under DBASE, CA-CLIPPER, BASIC and other software containing keyboard drivers. You need to use TOUCHUP to define the correspondence between the touch area and the keyboard
The software ELODRV touch screen driver that does not support the mouse, for the new C , C++, Pascal and assembly language software development
The touch screen software can be directly driven by the touch screen alone, and TouchUp needs to be used to define the touch area.
windows MonitorMouse for Windows
Windows NT MonitorMouse for Windows NT (only applicable to Intel CPU hosts)
Os/2 MonitorMouse for Os/2
p>Macintosh MonitorMouse for Macintosh
Amiga Commodore-Amiga manufacturer provides
UNIX UNIX touch screen driver
Others directly contact Huanxing Touch Computer Co., Ltd. or Contact the local agent service provider for technical support
Note: E1o Touchsystems provides a full range of drivers and development tools to match various system environments. This table helps users choose the driver that is most suitable for user development and application software platforms. program.
5. Typical applications of touch screens
Typical applications
★Education and training★Program control
★Factory automation and industrial control ★Automatic testing
★Financial account processing★Medical instruments
★Multimedia information query★Sales management
☆Popular information☆Vending
☆Management information☆Restaurant and karaoke room
☆Product and corporate image introduction☆Electronic games
★Automated aviation system★troops
★Sanjin Engineering
Karaoke computer karaoke ordering system shopping mall shopping guide system post office business and postal code query
library query system medical monitoring system securities transaction query system
real estate sales Building system leadership office system bank inquiry system
Decision-making command system ATM automatic teller machine handwriting input and handwritten signature authentication
Early childhood education airport and station inquiry insurance business inquiry
Tax Information Inquiry Conference Information Inquiry Hotel Management and Lobby Inquiry
Mature touch screen application software in the domestic market
Telecom Bureau Telephone Charge Inquiry System Museum Navigation System Underground Pipe Gas Maintenance System
Post and telecommunications business inquiry system, tourist attraction tour guide system, underground cable maintenance system
Electricity Bureau electricity bill inquiry system, city comprehensive information inquiry system, large warehouse inquiry system
Bank public business inquiry system Archives Bureau Information Query System Laws and Regulations Query Software
Taxation Bureau Leader Query System Personnel Query System Patent Query Software
Government Head Economic Information Query System Talent Matchmaker Query System Trademark Query Software
Bank leader information inquiry system Karaoke karaoke system Industrial and Commercial Bureau enterprise registration inquiry software
National People's Congress and CPPCC Economic Information Inquiry System Public Security Household Registration Inquiry System Library Inquiry Software
Exhibition Navigation system, public security criminal wanted inquiry, art museum inquiry software
Mall shopping guide inquiry system, enterprise leadership information inquiry system, enterprise financial inquiry software
Sports competition information inquiry system, military combat command system, insurance business inquiry Software
Hotel lobby information query system, hospital navigation system, enterprise inventory query software
Airport transportation information query system, hospital outpatient query system, customs business query software
Train schedule Query system Securities information query system
Real estate sales system
Large building complex navigation inquiry system Golf navigation system Car sales software
Corporate image display system Port navigation system
Project Application
VldeoTex video and text car G1S navigation system
Machine tool control handwritten Chinese character recognition system
Power dispatching command ATM automatic teller machine
Metallurgical dispatching and command medical equipment
Fire equipment control and petrochemical simulation control equipment
Restaurant ordering game machine
Telecommunications Bureau 114 directory information station factory simulation training system
Telephone exchange switches control bowling lane scoring system