How Touch Screens Detect If You Touch It

If you do not understand how the touch screen, the following  explanation of how to work the touch screen when you touch it. If you do not understand the following article please comment in the comment section.

Resistive Touch Screen consist of transparent films such as acrylic films and glasses with electric conductive and resistive layers (ITO). When fingers or pens touch the screen, the layers are pressed together, causing a change in the electrical current and thus a touch event will be registered. One of these two layers works as X-coordinate circuit whereas the other Y-coordinate.




When a Resistive Touch Screen detects x-coordinate information, a voltage is supplied from one electrode (Vcc) of the X-coordinate. Here, the other electrode is called GND. A touch event on the screen makes a contact between X-coordinate layer and Y-coordinate layer. Thus, the analog voltage at the touched spot (Xl) on the X-coordinate layer is measured at Y-coordinate electrode (A_in). The nearer to the Vcc, the higher the voltage measured. At the point E, A_in = Vcc. To the contrary, the voltage is lower if the point gets closer to the GND. At the point A, A_in = 0V *. By A/V conversion, the voltage can be translated into coordinate data.




Likewise, the system detects Y-coordinate information. By doing this alternately, the system acquires the coordinate value of a touched spot. Note * It takes no account of electricity loss in the controller circuit or the touch screen. In reality, the range of measured voltage is smaller than Vcc-GND due to this loss.

Source : DMC coltd

Read more »

4-Wire Resistive Touch Screen with Enhanced Quality

Fingerprint is less visible and easy to be wiped off due to anti-fingerprint coating.
Anti-glare hard-coating enables high quality image.
1mm pitch tail connection (Au),FPC(Polyimide).
Connectable with DMC standard controller board, TSC-34/RU-F.

Operating Temp.:-20°C to 70°C*
Operating Humidity :-20°C to 60°C Less than 90%RH* (Exceeding 60°C to 133.8g/m3*)
Storage Temp.: -40°C to 80°C*
Storage Humidity : -40°C to 60°C Less than 95%RH* (Exceeding 60°C to 142.9g/m3*)
Activation Force : 0.05N to 0.8N
Operating Life : Over 10 million touches
Light Transmittance : 80% (typical)
Surface Hardness : 2H
Max. Voltage : DC6V
Max. Current : 100mA(LR/UD), 0.5mA(XY)
Terminal Resistance : Less than 1kohm
Linearity : Less than 2%

All Resistive Touch screens have anti-glare surface finish. Specifications are subject to change without notice.

Source : DMC Coltd

Read more »

Aplication Product Of 4-Wire Resistive Touch Screen

Application:

Copy machine
Multifunction Printers

User :

General public
Office workers


Installation location:

Offices
Schools
Educational Institutions

Touch screen for Market:

4-Wire Resistive Touch Screen





A full line of Standard Resistive Touch screens that can fit most displays and applications. Standard 4-Wire Resisitve Touch screens are always Stock to provide quick delivery for smaller quantity needs.

Features




Maintain high quality
Customizable for market demand.

Source : DMCcoltd

Read more »

Product Aplication Of Surface Capacitive Touch Screen

Application
Gaming/Casino

User

General public

Installation location
Casino
Amusement arcade

Touch screen for Market
1.Surface capacitive touch screen





CST Surface Capacitive Touch Screen is a human-machine interactive interface comprised of a conductive-material-coated glass panel. Current is uniformed on the glass panel entirely. By touching a finger on the panel, current flows via the finger and the ratio of the current flow is computed in order to detect the touch location. Due to a simple and robust design, CST Surface Capacitive Touch Screen fully exerts its capability without losing its touch performance in any harsh environment.

Traits

    * Sensitive response and high resolution
    * Able to show a display monitor without loss of clarity
    * Easy installation onto a PC
    * Not affected by dirt, grease, moist use
    * Robust design allows to use outside
    * Simple design fit for large-sized touch screens

Capacitive touch structure -1



Capacitive touch structure -2





How Capacitive touch screens detect where you pressed

2. Five Wire Resistive Touch Screen

Five Wire resistive touch screens deliver high durability while remaining easy to use as the 4-wire resistive touch screens. The accuracy of the position sensor is maintained even if the surface is scratched (except for scratched area).

Features
Touch screen with high resistance against violent use is available

Source: DMCcoltd.

Read more »