Mobile phone touch screen is smartboards in classrooms equivalent to an induction device, can receive input signals, and driven by tactile feedback system, on the LCD screen to create vivid audio effect. Touch screen mobile phone is one of the components of the phone's screen, with strong and durable, easy to use, the advantages of fast speed.
Mobile phone touch screen can be interactive whiteboards in the classroom achieved by direct contact point and operation, the characteristics of capacitive touch screen lies in the following five:
Current (1) can be induced to the human body
(2) Wear gloves when unable to operate
(3) Has resistance to interactive flat panel display water damage, and oil pollutant
(4) Need to be calibrated regularly
(5) The inductance or magnetic induction, can make the touch screen failure
There are a lot of touch point interactive boards for classrooms on the touch screen, every touch point corresponds to a function switch, when fingers come into contact with the switch area, the function of the corresponding program will be started immediately.
Technology is the key to measure the classroom interactive whiteboard position of the touch point (coordinate), the more accurate location estimation of the more mature technical instructions.
Touch screen when lit up, is it in the work period, will continue to launch ultrasonic equipment, when the finger touching the screen, the fingers will stop and absorb some of the ultrasonic wave, the energy attenuation.
The working principle of the capacitive touch screen is the use of the human body induction current. When users touch screen, the body electric field is form coupled with mobile phone touch screen surface current, because mobile phone touch screen has a high frequency signal, the fingers from the point of contact when suck a small current, the current will be respectively from mobile phone touch screen issue on the four corners of the electrode, the four electrodes in the electric current is proportional to the current in the four corners in the fingers, so the controller through the precise calculation of the percentage of the four current, can be concluded that the location of the touch point.
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