smart board interactive whiteboard

Develop mobile handheld devices with the touch screen man-machine interface design is a complex challenge, especially for the projected capacitive touch screen design, it represents the current mainstream technology of multi-touch interface. 86 smart board Projected capacitive touch screen to pinpoint the location of the finger touch screen, it by measuring the subtle change of capacitance to finger position. In this kind of touch screen applications, the need to consider the problem of designing a key is the electromagnetic interference (EMI) will affect the performance of the system.
Projected capacitive touch screen structure
Typical of the projected capacitive sensor is installed at smart board for conference room the bottom of the glass or plastic cover plate. As shown in figure 1 for double sensor simplified view. Emission (Tx) and receiver (Rx) electrode is connected to the transparent indium tin oxide (ITO), the formation of cross matrix, each Tx - Rx node has a characteristic capacitance. TxITO underneath their RxITO by a layer of polymer film or optical glue (OCA) is separated. As shown, the direction of the Tx electrode from left to right, from outside the paper pointing in the direction of the Rx electrode in the paper.
Working principle of the sensor
Let's not consider interference factors, to analyze the smart boards for conference rooms touchscreen work: operator's finger nominal at ground potential. Rx is held by the touch screen controller circuit to the ground potential, while the Tx voltage variable. Change the Tx voltage causes a current through the Tx - Rx capacitance. A careful balance of Rx integrated circuits, isolation and measurement into the Rx charge, measuring the charge on behalf of the connection of the Tx and Rx "mutual capacitance.
The sensor state: no touch
Figure 2 shows the lines of magnetic force diagram not smartboard for business touch condition. In the absence of finger touch, Tx - Rx lines occupied a considerable space within plate. Outside edge of the field lines projected onto the electrode structure, therefore, the term "projected capacitive" by it.
The sensor state: touch
When the fingers cover plate, Tx and finger formed between the smartboards for business lines of magnetic force, the magnetic field lines replace a large number of Tx - Rx edge of magnetic field, as shown in figure 3. In this way, the fingers reduces the Tx - Rx mutual capacitance. Charge recognize the change of capacitance measurement circuit (delta C), to detect the Tx - Rx node at the top of the finger. Through the Tx - all the intersection, the measurement of delta C Rx matrix, can get the whole distribution of touch panels.
Figure 3 also shows another important impact: the fingers and Rx capacitive coupling between the electrodes. Through this path, electrical interference may be coupled to the Rx. Certain degree of finger - Rx coupling is inevitable.

Fusion in recent years, due to the business presentation, collaborative office, video conference, and many other functions, in line with the mobile, digital, intelligent business office of the new requirements, the heat rising all-in-one PC market. Especially with epidemic prevention and control of the normalized continues to advance, meeting the demand of the all-in-one growth prospects.
Second, is more and more brands touch screen interactive whiteboard on the market to join the ranks, users can choose the product scope is also more and more. In terms of its touch technique, often also have many choices. So, how to according to the needs of their users to choose? This article is to show you understand it.
Alone touch technology, there is resistance, capacitance, infrared, electromagnetic many kinds, however, after the development of the market and choice, the capacitance and the infrared is two types which are frequently used.
The so-called capacitive touch, is to use interactive whiteboard for schools transparent screen relative positioning system. By covering a layer of conductive metal objects on the screen of the transparent film, when the user touches the precise location of touch through the current changes. Its multi-touch support, and due to its principle of work need to induction current human body, therefore only has the response to the human body, with other objects don't response, can effectively avoid the mistake. And 4k smart board touch response relatively faster, more accurate. Capacitive screen is usually in appearance can be quite flat, waterproof and dustproof, afraid of light interference. But due to technical difficulty is bigger, so the غير مجاز مي باشدt is relatively high, some will be relatively complicated to install, so relatively few 55 inches above the large size of application.
And infrared touch, it is through setting somehow cross 75 inch smart board infrared matrix on the edge of the screen, the screen surface infrared detection network, to detect touch operation, which can be of any object, including the human body, make the operation response. It is not affected by current, voltage, electrostatic interference. And the price is relatively cheap, easy installation, stability and service life is pretty good, even more than 100 inches of product applications. But the disadvantage is that there are grooves, affect beautiful, waterproof and dustproof not, afraid of light interference.
See here, I believe you of the two kinds of common touch 75 smart board technology has had certain understanding, if you pursue the large size, low غير مجاز مي باشدt, or a special use requirements, such as explosion-proof consider infrared touch; If the pursuit of more accurate quick touch experience, or don't want to be the wrong operation problem of the human body, can choose a capacitive touch products.

Touch all-in-one PC hardware mainly divided into three parts, namely, LCD screen, touch screen and host computer. In these aspects, the LCD panel to determine whether the picture display resolution of the machine high-definition clear, not vague; Computer host decided to machine the overall performance of high and low, data processing speed and unhappy; Touch screen, as the main medium of users use machine operation, affect the user experience to the operation of the machine. Touch all-in-one PC is the advantage of operating it is very simple, convenient, do not need to use the traditional mouse and keyboard, touch screen board classroom users only need through the touch screen to complete the operation. So the touch screen selection is very important, is directly related to the stand or fall of user experience.
Touch screen in the market now is a lot of more phyletic, the main has a resistance capacitance screen, screen, infrared screen, acoustic screen, etc., the four kinds of touch screen is the mainstream of the touch-screen market application. Next, and the four kinds of touch screen to give you a simple introduction.
Resistive touch screens: excellent sensitivity and penetrability, 65 inch smart board longer service life and is not afraid of dirt, grease and jamming, suitable for all kinds of public places, especially need precision industry control. Mainly used in industrial control field, office, family and other fixed users of public places.
Sense of capacitive touch 65 inch touch screen screen: because the capacitance with temperature, humidity, ground conditions vary, so its stability is poor, prone to drift. Fear of the electromagnetic field can interfere with or drift, it is not easy to use in industrial control place and interference places. It doesn't need to have accurate public information can be used to query; Requires constant calibration, positioning.
Infrared sensor touch screen: low resolution, touch screen whiteboard but from the current, voltage, electrostatic interference, suitable for bad environment under the conditions of use; Suitable for all kinds of public places, offices, and asked not to high precision requirements of industrial control. And is suitable for large size touch screen equipment requirements, practical is the touch screen.
Acoustic screen touch screen: smart board touch screen pure glass material, excellent pervious to light, long life, good scratch resistant, suitable for unknown users of all kinds of public places. But afraid of dust dust and oil for a long time, so use in the place where the environment clean is better. In addition, need regular cleaning service.
In more than four touchscreen, suitable for application in touch query all-in-one product has two kinds of infrared screen and capacitive screen. Because the infrared touch screen technology is relatively mature and perfect, غير مجاز مي باشدt is low, so can be applied to any size of touch all-in-one PC products, while the capacitance screen can only apply to small products, big size product, the غير مجاز مي باشدt is too high, the price also is not غير مجاز مي باشدt-effective.

Capacitive touch screen technology USES the body's current sensing. Capacitive touch screen is a kind of four layer composite glass screen. The inner surface of the glass screen and interlayer coating a layer of ITO, the outermost layer of thin protective layer of silica glass. Mezzanine ITO coating as the working face, four Angle of draw out four electrodes, inner ITO as shielding layer, ensure good working environment. interactive panels for education When fingers touching the metal layer, the electric field due to the human body, the user and the touch screen surface to form a coupling capacitance. Conductor for high frequency current, capacitance is directly, so the fingers from the point of contact to absorb a small current. The current flows from the four corners of the touch screen, electrode respectively, through the four electrode current is proportional to the finger to the four corners. Controller through the accurate calculation of the four current ratio, the location of the touch point.
Local electric charge on the surface, in layman's terms, electrostatic, result in unable to judge whether there is a finger or other conductor (such as capacitance pen) according to the above. Friction in your pocket, you push hard on the often, there is some dirt on screen and hand sweat more, or the winter dry the body itself is static, etc., are likely to lead to screen local load. And in addition to the winter dry cause human body electrostatic, temperature is an important factor, the capacitance screen use condition is strict, such as temperature, humidity and so on, the theory of capacitance screen using the environment temperature requirements between 0 to 35 ℃. And the northern winter temperatures generally under 0 ℃, screen failure would happen naturally.
Generally speaking, interactive touch screens education forced to restart can be resolved. At the same time, press the power button and home about eight seconds, keyboard into a state can be forced to restart. However, if still can't solve, this is mostly caused by the hardware. This is usually caused by this situation. First, it fell down, or just dropped it. Screen touch screen is loose, fall off direct connection over a period of time.
Touchscreen brand on the domestic market, digital interactive whiteboard have high, medium and low three stages, including the international line of good quality brand, also has a reasonable price of domestic brands. If the budget is enough, takes the big brands, can choose international first-line brand.
If you are very concerned interactive panel board about the price, you need only be used for the touch screen display, often do not control input. Can choose the cheap homebred brand. If you are not very rich budget, also often use touch screen input control, consider the middle resistance performance of the brand.
General international first-line brand touch screen, digital touch screen board the price of relativity approachable certain products scope is relatively small, generally can only be used for its own brand products, and even some of the brand series of products, and therefore can not adapt to the other brands of equipment on the market, so choose adaptable equipment as far as possible.

Capacitive touch screen with touch feel is good, large surface hardness, scratch resistance, good appearance, good pervious to light, and many other advantages, has become the first choice for many industry users. Due to the sensitivity of capacitive touch screen is sensitive to surface mulch, users in the touch screen mounted on the surface of PVC panel, acrylic, or tempered glass panel, on the smartboards in classrooms one hand, the structure to ensure the clearance is as small as possible, at the same time the need to adjust the touch screen sensitivity, or touch screen work often can appear abnormal phenomena, such as touch button clicks don't respond, or button and wait for a phenomenon.
Method one: reconfigure the capacitance screen parameters through a configuration file
Capacitive touch screen, save the configuration parameters of serial interface screen new parameter configuration can be written to the sensitivity of capacitive touch screen. For customers, the capacitance touch screen mounted panel panel samples and structure can be mailed to our company. We can according to customer's sample test adjust the parameters of capacitive touch screen, generate a configuration file named "TP_HDxxx". The actual production process, the user put the document in the U disk or in the root directory of the TF card, can update with project file to a serial port in the screen, no additional operation.
SDWb, SDWa and SDWe interactive whiteboards in the classroom series support adjusted using the capacitive touch sensitivity.
Method 2: through the screen and configure the user to set
SDWb, SDWa series serial interface screen interactive flat panel display allows users to set the capacitive touch screen sensitivity function on its own.
As shown in figure 1, in VGUS development tools "panel and configure", check the "enable capacitance screen sensitivity", and set the sensitivity value. The sensitivity value range 0 x00-0 x1f, the larger the value, the higher the sensitivity. A corresponding user can increase the thicker the acrylic or tempered glass panel. The user can be flexible adjustment according to actual situation.
Compile corresponding interactive boards for classrooms engineering, capacitive touch screen sensitivity values will be stored in the project file. When the user download the project files to a serial port, screen with capacitive touch screen sensitivity parameters will be updated to the screen in the serial port.
Although can adjust the capacitive classroom interactive whiteboard touch screen sensitivity by the above method, solve the problem of surface mounted to the cover plate. But for conditional production users, on the surface of the capacitive touch screen is not recommended to add cover plate. Capacitive touch screen outer material used is toughened glass, itself has features of high hardness and good resistance to scratch, pervious to light. If the need for structure design, or structure, waterproof etc. To add cover, and also to have the production conditions, the proposal USES custom capacitive touch screen outer toughened glass, this structure is simple, reliable and good غير مجاز مي باشدt performance.

Thanks to the fervor of smart phones, the concept of the capacitive touch screen has become the focus of concern of the user and market technical personnel, with the aid of the apple still is sending out the forerunner of the wind, now in various smart board interactive whiteboard fields, the concept of capacitive touch screen is like nature itself, as common, we use the mobile phone has become the biggest beneficiaries of the computer, car navigation, field of new energy vehicles, and so on have also started to as capacitive touch convenient operation concept began to the horizon.
Capacitive touch screen manufacturing principle: TeTi induction with life on the screen charge mobile. These charges from the wire around the touch screen through to touch IC, analysis of charge mobile in its foot on the formation of the current location. Relative to the market was all the rage, resistive touch screens of capacitive touch technology demand is higher, the collocation of existing ideas, smart interactive whiteboard accuracy has reached 99%, also have on material completely scratch-resistant glass material, and to a certain extent, with the purpose of protecting effect, about the display effect, the damage resistance, durability, light transmittance, sensitivity, precision and so on pragmatic perspective, capacitance screen also has its own unique innovation, although expensive, but still became the dominant application technology on the market today.
Learning some efficacy, practicability, if is confined smart board whiteboard to the concept of the capacitive touch screen this was also a bit of a shame, because it has grown much more than this.
Back in the past, millet, Letv super TV, the concept of smart TV now has slowly begun to phone as convenient capacitive touch screen to start conversion. Make the future of smart cars and car networking concept, now the birth of intelligent rearview mirror products have been completely with the capacitive touch screen prospective advantage, and about the HUD, overall car holographic capacitive touch screen concept also gradually in the technology of hers.
Unconsciously, we have already received an important interactive digital whiteboard feedback, it is a fantastic development concept of capacitive touch screen, or for the future of science and technology market to witness the careful preparation, after the world who also unexpected, science fiction film also not be to cannot happen in the future science and technology, the development of the capacitive touch screen is far less than that, maybe there are other better foresight in the field of fusion, such as the recent intelligent furniture, intelligent medical, the heat and the singularity university aims of artificial intelligence and so on.
Strive to explore resistance capacitance screen electronic board for classroom contrast screen before the development of the industry advantage, theory of capacitance screen still saw a different science, have to say, this thing is really amazing, science and technology has changed everything in the world, but for us, and convenient, practical and fast way of life between fast synchronization of intelligence. Strive to explore resistance capacitance screen contrast screen before the development of the industry advantage, theory of capacitance screen still saw a different science, have to say, this thing is really amazing, science and technology has changed everything in the world, but for us, and convenient, practical and fast way of life between fast synchronization of intelligence.