The working principles of touch screens
Capacitive touch screen adopts a glass structure in which transparent conductive materials are installed. Low voltage is around the screen, creating a low-voltage AC field. When a customer touches the screen, the currency from the electrodes at four sides will flow to the touch point and create a voltage difference. The currency's strength is directly proportional to the distance from the finger to the electrode. The controller behind the screen will accurately calculate the position of the touch point (X,Y) according to the proportion of the current and its strength and report the result to the computer.

Application of touch screens
Yili capacitive touch screens are the first choice for many industries. It can be used for public information inquiry, electronic games, POS system, investment Kiosk, ATM and factory automatic control system.

Characteristics of touch screens
Accurate positioning: linear <1.5% (<1.0% for special need); controller responds rapidly.
FPC technology: Low resistance and pliability for FPC
Durability: Excellent seal technology is adopted to prevent the intrusion of grease, dust, water and chemical matters. Its life span could reach 225 million times.

Light transmission and responsiveness of touch screens
As transparent films are used, the touch screen yields little reflection but good light transmission. The screen is sensitive and can respond to slight touch.

Main specifications of touch screens
Varying standard sizes: From 6.5"to 22".
Compatibility: Completely compatible with Microtouch controllers
Specifications:

• Electric circuit：5V DC，35mA
• Transmission mode：Conductive metal pen or finger Light transmission rate: >90%
• Hitting times: >225 million timesTouch point vibrating time: <3ms Operating
• emperature: -15 C ~+70 C Linear：1.5% (or <1.0% for special need)
• Storage emperature：-50 C ~+85 C
• Surface hardness: 6H Type of glass: Common glass, toughened glass

1. High transparency, high intensity and high light transmission rate;
2. Scratch-proof glass; it can work normally even with scratch;
3. Dense distribution of touches points; more than 10,000 points for each square inch;
4. Automatic correction for touch float; good for precision operation;
5. High durability; single point touches can exceed 50 million times.
6. Patented dust prevention technology; the acoustic wave screen is dust-proof;
7. Finger or soft pen can be used to touch.
8. Technical indices:
   

• Resolution: 4096×4096
• Positioning accuracy: 2mm
• Light transmission rate 90%～92%
• Touch activity force: 100 g (adjustable)
• Responding time: less than 16 milli-seconds
• Durability, scratch-resistance; bear more than 50 million times of single point touches.
• Working temperature: -20℃～+50℃
• Storage temperature: -40℃～+70℃
• Humidity: 10%～90%（40℃）
• Altitude above sea level: 3000 meters
  

UniTouch infrared touch screen

• Based on infrared scanning technology; redundancy circuit design; high stability and reliability;
• Maintenance-free; no special requirement is placed on screen touches;
• Not affected by dust, water, grease, violent damage or industrial pollution Can be used anywhere;
• Applied for KIOSKs, automatic terminals, POS machines, industrial control equipment and medical equipment, which are strictly demanding;
• Maintenance-free should be a key factor when choosing touch screens, which should be able to work non-stop. Many other touch screen equipment cannot satisfy this demand. Infrared technology is an ideal solution.
  

Technological indices (15 inch for example)

• Resolution 1000*720
• Physical resolution 2.5mm
• Responding speed 　 <16ms o minimum touch object ≥φ2.5mm
• Input voltage +5v DC
• Working currency 120mA
• Thickness 4.5mm
• Resistance to improper use: Good
• Light transmission rate: 100%

IntelliTouch surface acoustic touch screen

• Made of special glass; no surface coating is applied; screen is clear and transparent
• Resistance to grind and scratches
• Applied to unknown public arenas
• Resolution as high as 4096×4096
  

AccuTouch five-wire analog resistive touch screen

• Water- steam-, dust-, and grease-proof; high cost technique
• Anti-interference performance meets the requirement of various high-grade arena
• Rapid response; accurate touch
• Resolution as high as 4096×4096

ClearTek capacitive touch screen

• Made of special glass; covered with special film capacity
• Dust-proof, water-proof and grease-proof
• Vulnerable to electromagnetic interference; positioning accuracy is not high
• Resolution 1024×1024
  

TouchTek five-wire analog resistive touch screen

• Water- steam-, dust-, and grease-proof; high cost technique
• Anti-interference performance meets the requirement of various demanding arenas
• Rapid response; accurate touch
• Resolution as high as 4096×4096

CRT touch monitors

• Installed by specialized engineers to reduce installation risk;
• Reliability guaranteed;
• Performance-price ratio is much higher than surface acoustic wave and monitors;
• Packaged guaranteed service.
  

LCD touch monitors

• Five-wire or four-wire resistive touch screens are integrated by brand-name LCD;
• Touch accurate, response fast, radioactivity-free and space saving;
• A good assistant to leaders