Touch panel Touch Pane Technical Analysis Character LCD Modules

Resistive
Resistive touch screen can be said that the most a technical resistance driving principle is the way to look for electricity voltage drop axis, can be seen from the chart below, the X-axis and Y-axis by a pair of each 0 ~ 5V voltage to drive when resistive touch screen Touch, because the circuit is turned on, and will produce a voltage drop, the controller will calculate the percentage of voltage drop and then further calculate the coordinates axis.
From the surface of the resistive structure is concerned, the usual resistive upper ITO Coating PET when the material is, the lower is based on of ITO Coating PET or glass when the material is usually not used when the upper and lower levels based on insulator spacer Dot to distraction, or else will produce Constant Touch (cursor fixed).
General resistance architecture Film on Glass (FG), means that the upper ITO Coating PET lower based on ITO Coating Glass, the disadvantage is in use ordinary glass accidentally torn shards of glass cut user.8x2 lcd
In order to avoid this accident, 3M in particular the use of a more secure architecture Polyester Laminated (PL), the upper layer or the ITO Coating PET, but the lower ITO Coating of PET, optical adhesive, chemically strengthened glass (top-down) . Chemically strengthened glass pressure is 3.4 times stronger than the general resistance of the glass, when chemically tempered glass or unfortunately broken optical adhesive layer coated chemical tempered glass pieces, to avoid injury caused by broken users, just like car stop the wind glass insulation paper, only the crack will not break, such Polyester Laminated architecture resistive panel security is much better than the Film on Glass (FG).
Capacitive
The capacitive touch panel, compared with the resistance of formula, is a completely different technology, the capacitive structure is relatively simple, basically based on the ITO glass as the main body, in the four corners of the ITO glass discharge, a uniform electric field is formed in the surface, When the conductive object, such as a person's finger, for example, sucked a little trace of the current behind the controller will calculate the current being sucked out of proportion and calculates the X-axis and Y-axis.
Transmittance
The touch panel is attached to the outside of the LCD, so its light transmittance and the relative importance of its anti-glare and anti-reflection characteristics. Capacitive touch panel is not easy to achieve high light transmission and anti-glare. Usually only 85% of light transmittance. And anti-glare effect is poor.16x4 lcd
3M's new generation of capacitive capacitive touch screen ClearTek II transmittance of 91.5%, its surface and anti-glare anti-reflective treatment. Compared with resistive touch screen, capacitive touch screen allows the entire visual lit up, the entire visual texture also raise a lot of, touch screen manufacturers do not have to transform the LCD to improve brightness, save a lot of cost.