Resistive touch parsing and Comments

Resistive touch screen to control the use of pressure-sensitive touch screen . The main part of the resistive touch screen with a display surface is very thin with a resistance screen, which is a multilayer composite film , it is a layer of glass or hard plastic plate is used as grass , the surface is coated with a layer of transparent metal oxide ( transparent conducting resistance) conductive layer , above the outer surface and then covered with a layer of hardened , smooth anti-friction plastic layer , its inner surface is also coated with a coating , among them many of the small (less than 1/1000 inch) transparent isolated point of the two conductive layers separated by insulation. When a finger touches the screen, two conductive layers in the touch point position will have a contact resistance changes in the X and Y directions generated signal is then sent to the touch screen controller. Controller to detect and calculate the contact (X, Y) position , then according to the simulation of a mouse operation. This is the resistive touch screen technology of the basic principles . So resistive touchscreen available hard object manipulation . Resistive type touch screen technology is the key material , commonly used transparent conductive coating materials are:

ITO, indium oxide , a weak conductor , the characteristic is reduced when the thickness is 1800 Angstroms (Å = 10-10 m ) or less will suddenly become transparent , light transmittance was 80% , and then go on thin but decreased transmittance , time and up to 300 angstroms thickness to 80% . All ITO resistive and capacitive touch screen technology touch screen technology are used in the main material , in fact, resistive and capacitive touch screen technology is the ITO-coated face .

Nickel-gold coating , five -wire resistive touch screen of the outer conductive layer using good ductility nickel deposit coating materials , cell phone touch screen

Outer conductive layer due to frequent touch, use good ductility nickel deposit materials in order to extend the service life , but the technology costs more expensive . Nickel-gold conductive layer scalability is good, but only for transparent conductors, is not suitable as a resistive touch screen face, because it is high conductivity, and the metal is very difficult to achieve a uniform thickness , suitable for voltage distribution layer , only as a probe layer .

1 , four -wire resistive screen four -wire resistive analog technology work two transparent metal layers increases 5V constant voltage on each floor : a vertical direction and a horizontal direction . Total need four cables. Features: High -resolution , high-speed response. Surface hardness treatment, reduce abrasion, scratch and anti- chemical treatment. With glossy and matte . Time correction, high stability , and never drift.

Two , five -wire resistive screen five -wire resistive touch screen technology of the two primary directions of the voltage field through a precision resistor networks are added to the glass conductive work surface, we can simply be understood as sharing in both directions of the voltage field work plus in the same work surface , and the outer conductive layer of nickel-gold is only used as a pure conductor only , after a touch detection time- point of the inner ITO contacts X and Y- axis voltage value is measured as the position of the touch point . Five -wire resistive touch screen ITO need four wire inner and outer conductors only for just one , Graphic LCD Display the touch screen may Lead Total 5 . Features: High -resolution , high-speed transmission response. High surface hardness, reduce abrasion, scratch and anti- chemical treatment. 30 million times the same point contact can still be used. Conductive glass as the substrate media. Time correction, high stability , and never drift. Five -wire resistive touch screen with high-priced and high environmental requirements shortcomings.

3 , resistance screen limitations either four -wire resistive touch screen or five -wire resistive touch screen , they are kind of the outside world completely isolated working environment, 15-inch Industrial Touch Monitor ( touch screen applications ) are not afraid of dust and water vapor , it can be used any object to touch , can be used to draw and write , more suitable for industrial control and office limited use . Resistive touch screen is a common drawback is that because the outer layer of the composite film with plastic material , people do not know or use too much force may scratch the whole touch sharp touch screen scrapped as a result lcd graphic display. However, within limits , only scratch injured outside the conductive layer, the outer layer of conductive scratch for five -wire resistive touch screen is not related , while the four -wire resistive touch screen is fatal .