Touch screen works

We will look further into the two most commonly used touch-screen technology. The most widely used technology is resistive touch. Before the might of the vast majority of people are in the bank's ATM machine, many credit card in the mall inspection machines, or even enter a single ordering in a restaurant used this type of resistive touch technology. Projection-type capacitive touch screen, use the range is not so wide, but with the rapid development of power. Projection-type capacitive interface mobile phones and portable music player in the market. Either resistive or capacitive technology has a sturdy electrical component, the use of ITO (indium oxide tin, transparent conductors), these two techniques will be long-term use.Low Temperature Display
The resistive touch screen includes a flexible top layer, then a layer of ITO, an air gap, followed by another layer of ITO. The panel has four wires attached to the ITO layer: "X" layer of the one of the right and left side of each one of the top and bottom of the "Y" layer.
When the flexible top-level pressure contact with the following layer detected by touch. The position of touch is measured by the following two steps: First, X-right "to be driven to a known voltage, while" X Left "is driven to ground, the voltage read from the Y sensor. This provides the X coordinate. Repeat this process for the other axis to determine the precise location of the finger.
Resistive touch screen, 5-wire and 8 linear. 5-wire type with a more durable and low-resistivity conductor layer instead of the top of the ITO layer. 8-line panel through better calibration characteristics of the panel to achieve higher resolution.
For resistive technology has several disadvantages. The flexible top transmittance of only 75% -80% of the (Impact resolution), and Multiple sources of error in the measurement process of the resistive touch screen. If the ITO layer is inconsistent, the resistance of the sensing range will not be linear. 10-12 measuring voltage accuracy, which is difficult in many environments. To the touch points and lower the LCD image alignment, many existing resistive touch screen requires periodic calibration.
On the contrary, the projection-type capacitive touch screen with no moving parts. ITO and the transmittance is almost 100% of the glass sheet between the LCD and the user. The projection type capacitance sensing hardware comprises a glass top (see Figure 2), The following is an X sensor array, a layer of insulating glass, then the following is the Y sensor array is located on the glass substrate. The panel is connected to each of the X and Y sensor, 5 x 6 panel a total of 11 connections (as shown in Figure 3), 10 x 14 panel 24 sensor connection.graphic lcd display module