How to select a high quality capacitive touch screen?

Views : 668
Update time : 2017-07-08 14:06:01

Capacitive touch screen performance of the most far-reaching changes in technology to be transferred from resistance to capacitive touch screen technology. Forecast according to the market research agency iSuppli, by 2011, nearly 25% of the touch screen mobile phone will be transferred to the resistive capacitive touch screen. Capacitive touch screen technology brings a variety of benefits, will prompt the rapid growth of the market.

When the traditional resistive touch panel is used for sensing the finger or the touch pen, the top layer flexible transparent material is pressed down to contact the conductive material layer below. In fact, the projected capacitive sensing hardware includes the top layer of the glass material, followed by the X and Y axis components, as well as on the glass substrate of indium tin oxide (ITO) insulation layer. Part of the sensor suppliers do a single sensor, embedded X and Y axis sensor and small bridge component in a single ITO, when a finger or other conductive objects close to the screen, it will generate a capacitance between the sensor and the finger. Relative to the system, this capacitor is quite small, but can use a variety of techniques to measure the capacitance.

One technique is the use of TrueTouch components, including the rapid change of capacitance, and the use of a discharge resistor to measure the discharge time. The all glass touch surface gives the user a smooth, smooth touch. End product manufacturers also prefer glass screen, because the glass material will allow the terminal product has a beautiful line of industrial design sense, and can provide high-quality capacitive touch signal measurement. Finally, not only to consider the appearance of the touch panel, it is important to understand the mode of operation. In order to design a good touch screen products, we must pay attention to the following parameters.


Accuracy: the accuracy can be defined as the maximum positioning error in a predefined touch screen area, in the linear distance between the actual position of the finger and the measuring position. In the measurement accuracy, the use of a simulation or mechanical fingers. Place the finger on an accurate position on the panel, and then compare the actual position of the finger with the measuring position. Accuracy is very important, the user wants the system to accurately locate the finger position. One of the most important disadvantages of resistive touch screen is low accuracy, and the accuracy will gradually weaken over time. The accuracy of the capacitive touch screen creates many new applications, such as the virtual keyboard and handwriting recognition without touch pen. Figure 1 shows an incomplete structure of the touch panel data, showing the location of the finger position of the phenomenon, but in fact the simulation of the finger is a straight line movement.

Related News
4 Main Applications of AUO Displays 4 Main Applications of AUO Displays
Nov .26.2022
AUO general displays provide ultra high resolutions, sunlight readability, and long product life. Applications include ATMs, POS, kiosks, industrial computers, security monitors, entertainment machines, medical equipment, factory automation, inflight entertainment, and marine displays. AUO also provide customized designs and integrated touch solutions to enhance clients' competitive advantages.
3 Advantages of INNOLUX LCD Panels 3 Advantages of INNOLUX LCD Panels
Nov .15.2022
INNOLUX Optoelectronics provides advanced display integration solutions with innovative and differentiated technologies, including 2K, 4K ultra-high resolution, 3D naked eye, IGZO, LTPS, AMOLED, OLED, and touch solutions.
AUO, BOE and INNOLUX, Which IPS Screen is Best? AUO, BOE and INNOLUX, Which IPS Screen is Best?
Oct .25.2022
IPS screen is a technology based on TFT, and its essence is TFT screen. IPS solves the problem of viewing angle by making the apparent length of the molecule the same in all directions. AUO, BOE and INNOLUX, Which IPS Screen is Best?
Application of INNOLUX in Intelligent Medicine Application of INNOLUX in Intelligent Medicine
Oct .18.2022
INNOLUX offers a full range of smart medical solutions with the most complete medical display modules ranging from 15" to 58", including 15" XGA, 19" SXGA, 23.6" FHD and 23.8" FHD, all with 5:4 and 16:9 screen ratios, bringing wider applications for ultrasound diagnostics.