Author Topic: Difference between CAPACITIVE and RESISTIVE touchscreens  (Read 1801 times)

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Offline sarthak9333

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Difference between CAPACITIVE and RESISTIVE touchscreens
« on: September 25, 2012, 10:08:29 pm »
The Analog Resistive touch screen is a sensor consistingof two opposing
layers, each coated with a transparent resistive material called indium
tin oxide (ITO). The ITO used has a typical sheet resistivity between
100 and 500 ohms per square. The layers are separated by a pattern of
very small transparent insulating dots. Silver ink bus bars (~50mW/sq)
make an electrical connection to the surface of the ITO at the outside
edges, spanning the desired axis of the given layer. Silver ink traces
(~50mW/sq) connect the bus bars to an electromechanical connector used
for interfacing to the sensor. The cover sheet has a hard, durable
coating on the outer side, and a conductive coating on the inner side.
When touched, the conductive coating makes electrical contact with the
coating on the glass, and a touch is registered by the analog
controller. Resistive touchscreens deliver cost-effective, consistent
and durable performance in environments where equipment must stand up to
contaminants and liquids, such as in restaurants, factories,and
hospitals. Disadvantages of Resistive technology include only 75%
optical transparency and the fact that a sharp object can damage the
resistive layers. The Analog Resistive technology is perfect for PDAs,
web phones, and other handheld consumer applications.

The touchpad contains a two-layer grid of electrodes that are connected
to a sophisticated full-custom mixed signal integrated circuit (IC)
mounted on the reverse side of the pad. The upper layer contains
vertical electrode strips while the lower layer is composed of
horizontal electrode strips. The IC measures "Mutual capacitance" from
each of the horizontal electrodes to each of the vertical electrodes. A
human finger near the intersection of two electrodes modifies the mutual
 capacitance between them, since a finger has very different dielectric
properties than air. When a user touches the screen, some of the charge
is transferred to the user, and makes the potential difference on the
screen. After the panel controller recognizes that, the controller will
send the X-Y axis information to the PC port.

The advantage is that capacitive technology transmits almost 90% percent
 of the light from the screen. The superior efficiency gives capacitive
better than resistive technology.               
MaStEr oF PuPpETs...!!!! :D \\m/ \\m/


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Offline ranjan82

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Re: Difference between CAPACITIVE and RESISTIVE touchscreens
« Reply #1 on: January 06, 2014, 05:28:19 pm »

I am glad to elaborate it bit more
Resistive Touchscreen
A resistive touchscreen comprises of several layers, out of which the flexible plastic and glass layers are two important electrically resistive layers. The front surface of resistive touchscreen panel is a scratch-resistant plastic with coating of a conductive material (mostly Indium Tin Oxide, ITO), printed underside.

The second important layer is either made of glass or hard plastic and is also coated with ITO.

Both the layers face each other and are separated with a thin gap in between. An electrical resistance is created between both the layers in such a way that charge runs from top to bottom in one layer and side-to-side in another.

When a finger or stylus tip presses down on the outer surface, both the ITO films meet. It is the measure of the resistance of both the layers at point of contact, which leads to get an accurate measurement of the touch position. The accuracy also relies on the evenness of the coating of ITO on both the layers.

Advantages of Resistive Touchscreen

Low production cost
High resistance to dust and water
Best used with a finger, gloved hand or stylus
Best suited for handwriting recognition
Disadvantages of Resistive Touchscreen

Not too sensitive, you have to press down harder
Poor contrast because of having additional reflections from extra layer of material placed over the screen
Does not support multi-touch
Phones with Resisitive Touchscreen

Spice Mi-270, Nokia C2-02, Samsung Star Duos, Spice FLO, LG P520, Nokia C5-05, LG Cookie Joy, Samsung Champ Duos, Nokia C2-02

Capacitive Touchscreen

A capacitive touchscreen also consists of two spaced layers of glass, which are coated with conductor such as Indium Tin Oxide (ITO). Human body is an electrical charge conductor. When a finger touches the glass of the capacitive surface, it changes the local electrostatic field. The system continuously monitors the movement of each tiny capacitor to find out the exact area where the finger had touched the screen.

Advantages of Capacitive Touchscreen

Because capacitive touchscreen has glass layer instead of plastic, it looks brighter and sharper
Highly touch sensititive and doesn’t need a stylus
Supports multi-touch
Disadvantages of Capacitive Touchscreen

Because the technology is dependent on the conductive nature of human body, it doesn’t work if the user is wearing gloves
Because of having a complex structure, these are quite expensive
Glass is more prone to breaking
Phones with Capacitive Touchscreen

HTC Incredible S, Apple iPhone 4S, Spice Mi-310, LG Optimus Black, HTC Sensation, HTC Explorer, Samsung Omnia W, Samsung Galaxy Ace Plus, Samsung Galaxy Note, Samsung Galaxy SII, Nokia Lumia 800


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