What is Resistive touchscreen?
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For resistive touch screen, there are two conductive layers. The two layers are separated by one layer of dot spacers. The top conductive layer is called matrix, in which striped electrodes on substrates such as glass or plastic facing each other. Normally, this top conductive layer is ITO film, in which, ITO is coated onto the PET layer. On the market, there are several mainly suppliers for ITO layers, mainly from Taiwan area and Japan, Oike, Nitto, Joinwell, Ushine...
The second layer is called analogue which consists of transparent electrodes coated onto the substrates. Normally, this layer is made from glass, with ITO coated. When contact is made to the surface layer of the touchscreen, the two sheets are pressed together. On these two sheets there are horizontal and vertical lines that, when pushed together, the computer will register the precise location of the touch. Because the touchscreen senses input from contact with nearly any object (finger, stylus/pen, palm), resistive touchscreens are a type of "passive" technology.
Resistive touch screens have been widely used for decades since it’s introduction to the market in 1970s and are still to be thought as a popular, well proven and trusted solution. With their immunity to EMC/EMI/ESD features and compatibility with a wide range of available controllers, resistive touch screens are easy to integrate and employ in many applications(military, industrial, hospital, medical, ); and often incur lower development costs than it’s alternatives, such as PCAP.
Sphotoelec’s core team has been designing and manufacturing resistive touch sensors since 2008. This extensive experience has been incorporated into today’s designs, using advanced materials to produce the most reliable and cost effective resistive touch screen sensors to accommodate various requirements from customers on the market.
Resistive touch panels are one of the most adopted technologies. There are several types of resistive touch panels based on different detection principles, they are 4 wire resistive touch screen, 5 wire resistive touch screen and 8 wire resistive touch screen. The term “wire” is used to indicate how many circuit elements are terminated to the cable for connection to the interface electronics. 4 and 8 wire resistive is similar in operation. All resistive technologies have similar constructions. That is to say they are analogue switches, and a kind of “passive” electric product.
4 wire resistive touch screen:
4-wire touch screens are suitable for small or medium sized products such as HMI and hand-held systems. These panels utilize X+, X-, Y+ and Y- lead outs at the four edges of the screen. When contact is made, X/Y read-outs are then read by the controller and converted into the correct coordinates.
Features of Sphotoelec 4 wire touch products
Size: 3.5~15.6 inches.
Insurance: 1 year.
Operation Life: > 1Million times
Transmittance: > 82%
Operation temperature:-30~70℃
Storage temperature:-40~80℃
Surface hardness:3H
Surface coating: AG/AR
The principle for 4 wire resistive touch
5-Wire resistive Touch Screen
5-wire touch screens are mainly used for military, industrial, navigation, and so on. 5 wire resistive touch can be produced from 5.7” to 24.0”, is suitable in many different systems and different environment.
In a 5-wire touch screen, the top layer, normally an ITO film, is a sensor layer while the main circuitry is located in the layer underneath. While the sensor layer is conductive, even broken, it will not affect the second layer to calculate the precise touch location.
Features of Sphotoelec 5 wire touch products
Size: 5.7~24.0 inches.
Insurance: 3 year.
Operation Life: > 35Million times
Transmittance: > 82%
Operation temperature:-30~70℃
Storage temperature:-40~80℃
Surface hardness:3H.
Surface coating: AG/AR
The principle for 5 wire resistive touch
8-Wire Touch Screen
The 8-wire touch screen is well suited for screens from 6”to 22. 8 wire product functionality is much like that of 4-wire product. The major difference between an 8-wire and 4 wire structure is that it 8 wire product has 4 additional protection circuit. These additional read-outs can be used to further adjust for possible distortion on the corners or edges of a larger screen.
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Features of Sphotoelec 8 wire touch products
Size: 3.5~15.6 inches.
Insurance: 1 year.
Operation Life: > 1Million times
Transmittance: > 82%
Operation temperature:-30~70℃
Storage temperature:-40~80℃
Surface hardness:3H
Surface coating: AG/AR
Structure and circuit comparison of 4 wire, 5 wire, 6 wire, 7 wire and 8 wire.
Layer structure and surface coating.
2 layers
3 layers
Clear film,
Anti-glare film
Anti-reflect Film.
Hard coating
FPC and connectors
FPC,
connectors
Advanced Resistive
GFG
GG
Multi touch resistive
Touch windows.
The requirements for reliability, speed, ease of use and sanitization of medical instrumentation have steadily increased. The use of touchscreens as an interface device has become a must in many applications.
TPI Projected Capacitive and Resistive touchscreens have been used in the demanding field of medical device and diagnostic instrumentation industry for over two decades. Our ability to customize touchscreens to meet your specifications and to recommend innovative solutions to improve performance sets us apart from our competitors. Our touchscreens are available for the life of your product and beyond. With our design, manufacturing and customer service all located at our facility in Valencia, California you are a phone call and no more than three time zones away from answers to your questions for our US customers.
TPI’s ability to manufacture both Projected Capacitive and Resistive technologies provides you the ability to choose the best touchscreen solution for your application.
Years of serving the medical industry has prepared us for the challenges and the opportunities that this industry presents. Please contact one of our application engineers to review your specific requirements or to obtain additional information.
For more information, please visit Four-Wire Resistive Touch Screen for Medical Instrument.