The four-line touch screen is almost the most basic production specification for touch screen practitioners due to factors such as cost and technical maturity. First of all, in terms of resistive touch screen technology, four-wire touch screens account for approximately 50% of the market. Its composition mainly includes one ITOFilm conductive film and one piece of indium tin oxide conductive glass ITO Glass. After the ITO Film and ITO Glass are conductive, they use the voltage of +5V (manufacturers use different voltages than +5V). In the middle part of the two layers of electric conductors, the ITO film and the ITO glass are separated by a space ball Spacer. The purpose thereof is to avoid a malfunction due to a short circuit caused by no touch.
The main working principle of the four-wire touch screen is to regard the lower part and the upper part as the work of the Y-axis and X-axis coordinates. Two conductive lines are installed on the peripheral edges of the ITO film and the ITO glass. At the same time, a fixed voltage is set at both ends to make it a uniform electric field.
Because the Dot Spacer is a barrier between the upper and lower parts, the upper and lower layers are insulated. If you touch the panel with a pen, finger, or other medium, it will cause a short circuit between the upper and lower layers, resulting in a voltage drop.
The main structure of the five-wire type is basically the same as that of the four-wire type. It is also the ITO Film and the ITO Glass that are divided into two layers of conductive layers, and the voltage of +5V is still used after conduction. In the middle, Spacer also separates the upper and lower layers. The biggest difference between them is that the two wires in the four-wire upper and lower layers control two conductive wires on the X-axis and the Y-axis, respectively. The five-line type is controlled by the lower conductive layer on the X-axis and Y-axis four lines.
On the upper layer, it is solely responsible for measuring the voltages on the X-axis and Y-axis. The voltage value it detects will be transmitted to the controller, and then the coordinates will be obtained. After the conversion, the digital signal will be transmitted to the host. Because the upper layer is a uniform conductive material, any point can be responsible for the transmission of voltage. Compared with the four-wire touch screen, the four-wire product has high durability, and the five-wire type can also be used in a slightly harsh environment. Maintain consistent accuracy and agility.
Hangzhou Kaike Electronics Co., Ltd.
Address: No. 2. Dadi Road, Haining Agricultural External Development Zone 314408,
Contact Person: May Wong
Telephone: 86-571-86830690 Fax: 86-571-86687367
Cell Phone: 86-15158112598