Not long after touching the touch screen monitor, you often hear "multi-touch" and "ten-touch".So what's a lot of touch screens?How to do multi-touch.Can capacitive touch screen be multitouch?
The capacitance plate can be divided into self-capacitance and mutual capacitance, usually mutual capacitance. It can realize multi-touch control, while self-capacitance can realize single point or local two points.Capacitive screen can be multitouch, and capacitive screen is the foundation of multitouch.The number of multi-touch controls is generally designated 3.5.Ten o 'clock.It is mainly related to the size of the touch screen. There are many technologies that can achieve multi-touch control, not just capacitive screen.Resistance screen can also, infrared screen, ultrasound screen can also.
The structure of capacitive touch screen
The capacitive touch screen is mainly constructed by coating the glass screen with a transparent thin film conductor layer, and then adding a protective glass outside the conductor layer. The double glass design can completely protect the conductor layer and sensor.The capacitive touch screen is plated with thin electrodes on all four sides of the touch screen to form a low voltage ac electric field in the conductive body.
When touching the screen, there will be a coupling capacitance between the finger and the conductor layer due to the human electric field. The current from the four electrodes will flow to the contact, and the strength of the current is proportional to the distance from the finger to the electrode. The controller behind the touch screen will calculate the proportion and strength of the current and accurately calculate the position of the touch point.The double glass of the capacitive touch screen not only protects the conductor and sensor, but also effectively prevents environmental factors from affecting the touch screen. Even if the screen is stained with dirt, dust or oil, the capacitive touch screen can still accurately calculate the touch position.Capacitive touch screens are coated with a transparent, special metallic conductive material.As the finger touches the metal layer, the contact's capacitance changes, making the oscillator frequency connected to it change, and the touch position can be determined by measuring the frequency change.