- Home »
- Knowledge Base »
- FAQ »
-
How Do Touch Screens Work
Cannot Log in Quality Complaint Some Parts Are Missing Shipment Payment Orders US Shipping Place quick order Vehicle Computer Basics How to Use Handheld Computer in Medical Care Touch Screen Basics Vehicle Computer Features Monitor Power Board Basics The Classification of Barcode Scanner How to Use Handheld Computer in Power Inspection How to Choose a Handheld Computer How to Choose an Industrial PDA What is a Handheld Computer What is a Laser Scan Engine IBS Points How to Select Car Power Adapter Chargers Vehicle Computer Detection Method How to Choose a Barcode Scanner for Supermarket How to Repair Vehicle Computer How to Choose a Barcode Scanner for Warehouse FAQs about Vehicle Computer Barcode Scanner Test Process Car Power Adapter Charger How Do LCD Screens Work The Difference Between The Mid-Range and High-End What If the Barcode Scanner is Unrecognizable Industrial Vehicle Computer Wearable Computer Basics Wearable Computer Applications Wearable Computer Application in Agriculture Honeywell Orbit MS7120 Barcode Scanner How to Set up Automatic Wrap for Motorola DS4208 Motorola Symbol DS9808 Barcode Scanner Symbol MC9200/MC92N0 Mobile Handheld Computer Zebra ZM400 Barcode Printer Zebra MZ220 Mobile Barcode Printer Motorola Symbol MC45 Handheld Mobile Computer MC3300 Handheld Mobile Computer MC9500-K Handheld Mobile Computer Symbol VC5090 Vehicle Mounted Computer Symbol MC9090-G Handheld Mobile Computer Symbol DS6708 Barcode Scanner Troubleshooting How to Identify the Symbol Barcode Scanner Model Symbol LS4208 Barcode Scanner Troubleshooting Symbol LS4278 Barcode Scanner Troubleshooting MS7120 Orbit Barcode Scanner Troubleshooting How to Choose Motorola Symbol Barcode Scanners Motorola Symbol DS6707 Barcode Scanner Symbol LS9203 Laser Barcode Scanner Installation How to Use Barcode Scanner in Production Symbol MC75A0 Handheld Mobile Computer Symbol MC65/MC659B Handheld Mobile Computer MC36 Handheld Mobile Computer MC1000 Handheld Mobile Computer How to Use Motorola Symbol DS9808 QR Code Scanner Honeywell MS7580 QR Code Scanner Troubleshooting Why Need a Special Printer for Printing Labels Motorola MC55A0 Series Handheld Mobile Computer What is a Barcode Scanner What is a Barcode Printer How to Clean a Printer Head Troubleshooting Common Barcode Printer Motorola MC32N0 Handheld Computer What are Vehicle Computers Technical Requirements Prospect of PDA in Medical Industry Motorola LS7708 Scanning Platform Troubleshooting Motorola LS4208 Barcode Scanner Buzzer Definition Industrial and Commercial Barcode Scanner How Does Motorola LS4278 Scanner Match the Cradle Motorola LS9208 Hands Free Barcode Scanner Choosing a Barcode Scanner for Production Line Motorola MC3100 Handheld Mobile Computer Motorola WT4000 Wearable Compter Zebra TC8000/TC80N0 Handheld Mobile Computer Motorola Symbol RS409 Ring Scanner Motorola Symbol MC9090-G Handheld Mobile Computer Zebra 105SL Troubleshooting Motorola Symbol MC9000 Handheld Mobile Computer Motorola Symbol MC40 Handheld Mobile Computer Motorola Symbol MC50 Handheld Mobile Computer Motorola Symbol WT4090 Wearable Computer Honeywell Dolphin 9900 Mobile Computer Honeywell Dolphin 7600 Mobile Computer Honeywell Dolphin 7800 Mobile Computer Zebra TC55 Touch Mobile Computer Motorola Symbol MC3190 Handheld Mobile Computer Motorola Symbol MC92N0-G Troubleshooting Motorola Symbol RS507 Ring Scanner Intermec CK3 Handheld Mobile Computer How to Maintain Motorola Symbol MC70 Motorola Symbol MC32N0 Operating Instructions Motorola Symbol MC9190/MC92N0 Warm/Cold Boot Zebra ZM400 Printer Calibration Symbol MC92N0 Battery Management Symbol MC3300 VS. Symbol MC32N0 Zebra ZM400 Troubleshooting Zebra Barcode Printers Classifications Symbol SE955 Laser Scan Engine Setting by SSI Symbol VC5090 Vehicle Computer Troubleshooting How to Clean Boot for Intermec 70 Series What is an 18650 Battery What are the18650 Advantages and Disadvantages What is a Battery Protection Board What is the Role of the Battery Protection Board Zebra ZM400 Barcode Printer Maintenance Motorola Symbol LS4278 Wireless Barcode Scanner Symbol MC92N0 and Zebra DS3678 Connection Method Symbol MC92N0 Handheld Computer Troubleshooting How to Save the CE System Settings after Cold Boot FAQs about Symbol Barcode Scanners How to Re-burn the Symbol MC9000 Operating System How to Configure the Symbol MC9190 Wireless Networ Quality Issues Others 
-
Knowledge Base
-
Need More Help?
How do touch screens work? For operational convenience, people use a touch screen instead of a mouse or keyboard. When working, the touch screen installed on the front of the display is first touched with a finger or other object, and then the system selects the positioning information input according to the icon or menu position touched by the finger. The touch screen is composed of a touch detection component and a touch screen controller; the touch detection component is installed in front of the display screen to detect the touch position of the user，and send it to touch screen controller after receiving the touch information; And the touch screen controller mainly receives the touch information from the touch point detection device, and converts it into contact coordinates, and then sent to the CPU, it can accept the command sent by the CPU and execute it.
The working principle of various types of products:
1. Surface Acoustic Wave Touch Screen
The three corners of the surface acoustic wave touch screen are respectively affixed with transducers for transmitting and receiving sound waves in X and Y directions (transducers: made of special ceramic materials, divided into launch transducers and receive transducers. It converts the electrical signal sent from the controller through the touch screen cable into an acoustic signal and an electrical signal of the surface acoustic wave energy gathered by the reflection stripes.), the four sides are etched with reflective stripe reflecting the surface ultrasonic waves. When a finger or a soft object touches the screen, part of the acoustic energy is absorbed, so the received signal is changed, and the X and Y coordinates of the touch are obtained through processing by the controller.
2. 4-Wire Resistive Touch Screen
The 4-wire resistive touch screen is covered with two transparent conductive layers ITO between the surface protective coating and the base layer (ITO: indium oxide, weak conductor, the characteristic is when the thickness is reduced to 1800 angstroms (angstrom=10-10 meters)) it becomes transparent suddenly, and when it goes thinner, the transmittance decreases, and when the thickness reaches 300 angstroms, the transmittance increases again. It is the main material of all resistive screens and capacitive screens.). The two layers correspond to the X and Y axes respectively. Intervals are insulated with fine transparent insulating particles, and the two conductive layers are turned on by the pressure generated when touched, and the touched X, Y coordinates are obtained due to the change in the resistance value.
3. 5-Wire Resistive Touch Screen
The base layer of the 5-wire resistive touch screen is covered with a transparent conductive layer ITO which adds the voltage fields in the X and Y directions to the same layer, and the outermost layer of nickel-gold conductive layer (nickel-gold conductive layer: only used as a pure conductor, when touched, the position of the touch point is measured by time-division detection of the X-axis and Y-axis voltage values of the contact points, and the inner ITO needs four leads, one outer layer, and a total of five leads.
4. Capacitive touch screen
The surface of the capacitive touch screen is coated with a transparent conductive layer ITO. The voltage is connected to the four corners. The tiny direct current spreads across the surface of the screen to form a uniform electric field. When the screen is touched by fingers, the human body acts as a coupling capacitor, and the current collects from the four corners of the screen to form another coupling capacitor. Calculate the relative distance from the current to the touch position by the controller to get the touched coordinates.
Frequently Asked Questions -
