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Elite Sales & Technology, LTDElite Sales & Technology, LTD is a Supplier of Custom Manufactured Molded & Injected Plastics, Touch Screens, Custom Keypads,
Membrane Switches, Connectors
& Light Guide Film
Used in Various Electronic Control Systems

Capacitive & Resistive Touch Screens

Elite Sales and Technology specializes in capacitive touch screens and resistive touch screens. We manufacture the best touch screens for many electronic applications - for medical, automotive, and electronic uses. From glass capacitive screens to resistive touch screens with top layers of PET, we can meet your project's needs. Continue reading below to learn more about capacitive and resistive touch screens.

Resistive Touch Screens

4 Wire 5 Wire
8 Wire Matrix

The 4, 5, & 8 Wire Touch Screens are known as analog resistive touch screens. Each type offers a wide variety of sizes as standard product, and of course, we can make custom designs per customer requirements. The Matrix is what is known as a digital resistive touch screen.

These listed touch screen designs have similar working principles. (Contact us for the differences in each.) Therefore only the 4-wire operating principle is discussed below.

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Operating Principle of 4 Wire Resistive Touch Screen

The construction of the touch screen is basically a two layer structure. The top layer is typically PET film, which is hard-coated on the non-conductive (top) side to prevent scratches. The bottom layer can be PET film or glass. The conductive sides of the top and bottom layers are coated with ITO (Indium Tin Oxide). The layers are separated by printed, transparent, non-conductive dots to provide the spacing. When in operation the unit is provided with voltage by a controller. As soon as contact between the two conductive layers is achieved, the controller determines the X and Y coordinate by calculating the voltage at the touch point. This common design normally has the X direction on the top film and the Y direction on the bottom film.


Planar Resistive Touch Screens

Planar Resistive Touch Screens are different from typical resistive touch screens. The Planar resistive touch screen has an additional film, or membrane switch type product, attached to the top of it by optically clear glue. This adds to the appearance of the touch screen and helps meet some design requirements where necessary.

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Capacitive Touch Screens

A capacitive touch screen is typically all glass as opposed to a resistive touch screen which can have a top layer of PET material. The glass layers will have a metallic conductive coating. Along the edges there are electrode patterns which distribute a low voltage field over the conductive layers.

A human finger, or a conductive device held by a human hand, touches a point on the capacitive touch screen and a small amount of current is drawn to that point causing a voltage drop. The controller calculates the touch point and the touch is registered and the response is given. Better durability and more than 90% light transmission rate are unique advantages of capacitive touch screens.

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Touch Lens Touch Screens

Touch Lens Touch Screens differ from traditional touch screens as the Touch Lens Touch Screens are integrated with the face of a device. This does away with the "sunken" or "depressed" appearance of the traditional touch screens because there is no bezel around the screen. Touch Lens Touch Screens are Capacitive in that they operate by touching with a finger or conductive device.

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Film Thickness: 0.188mm      Glass Thicknesses: 0.7, 1.1, 1.8, 2.0, & 3.0mm

Touch Screen Specifications

Environmental Conditions

Life Expectancy

Operating Temperature & Humidity -20ºC +60ºC, < 90% RH 4 Wire = 1,000,000 8 Wire = 1,000,000
Storage Temperature & Humidity -30ºC +70ºC < 90% RH 5 Wire = 10,000,000 Matrix = 1,000,000

Mechanical

Electrical

Operating Force 20 - 150 grams Operating Voltage 5V
Surface Hardness >3H Linearity
X, Y Resistance
1.5% or less
30 – 300 Ohms (varies by screen size)
Operating Current
Insulation
Impedance
Resolution
5mA – 25mA
>20M Ohms (25 VDC)

4096 x 4096

Optical

Light Transmission >80%

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