Resistive Touch Screen

Resistive Touch Screen technologyThe next time you are using a touch screen ATM, simply touch the screen without applying any pressure. You will find that the machine will not accept any input.

Apply pressure on the screen and it will start working. This is resistive touch technology in action.

A resistive touch screen is made of two transparent layers of glass or plastic, each coated with a conducting layer of Indium Tin Oxide (ITO). The conducting sides face one another and are separated by an air gap.

When pressure is applied by the user, the top layer bends and touches the bottom layer. This causes a small amount of current to flow at the point where they connect. The location of the touch event can then be measured by the sensors.

Unlike most other types of touch screens (capacitive, infrared touch screen technology ) these screens have moving parts. Depending on how they are fabricated, these screens can be classified as:

    • Analog 4 wire resistive – In this variant, if the top sheet has electrodes for the vertical direction (Y), the bottom sheet will have electrodes for the horizontal direction (X). The top and bottom sheets measure each others’ voltages and based on that sensors can determine the location of the touch point.
    • Analog 5 wire resistive -In this variant, the voltage of the bottom sheet is measured by the top sheet, with electrodes placed at four corners of the bottom sheet. The top sheet does not have any electrodes.
    • Analog 8 wire resistive – These screens are similar to Analog 4 wire screens. The only difference is an extra set of electrodes, which automatically take care of alignment and recalibration issues that crop up in the 4 wire screens over long term use.

Pros of Resistive Touch Technology

      • Inexpensive to make
      • Can accept an input from anything, including pens, gloved fingers etc
      • Can be easily assembled from the component parts; screens and sensors
      • Can work in rain or in the presence of other fluids

The Baanto ShadowSense Advantage

Resistive touch screens have a number of issues which are addressed by ShadowSense touch screens.

Cons of Resistive Touch Screens ShadowSense Benefits
Does not support true multi touch Supports true multi touch including gestures
Is not very sensitive and excessive force is needed for touch activation The screen is extremely sensitive and can recognize even the soft bristles of a paint brush
Distortion in electric field between layers can cause errors in touch detection No electrical distortions resulting in error free touch detection
Has an air layer between the two glass layers which affects display quality and clarity Screens have 91% optical clarity and 93%/95% transmissivity, making them extremely readable even in low light
Not scalable as it is impossible to maintain uniform thickness between two screens beyond a certain size, and the ITO deposition technology hits a performance ceiling beyond 22” Can range from 8’’ to 267’’ in size without compromising on cost effectiveness and performance
Outer layer scratches easily, and the ITO layer cracks with use, resulting in dead zones Scratch and dust resistant as it is covered by 3mm thick tempered glass, and lasts for more than 200,000 hours without any degradation in performance, even if LEDs fail

Ready to leverage ShadowSense?

Baanto offers unparalleled touch technology through ShadowSense. Our technology outperforms other touch technologies while yielding cost savings.

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