Description
5SDF0860H0003 Protective devices
5SDF0860H0003 Protective devices
Module Clips Drive controller servo moto
5SDF0860H0003 Protective devicesSuitable for steel manufacturing, thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, gas supply, and other glass manufacturing, paper mills, mechanical manufacturing, electronic manufacturing, automotive manufacturing, aviation manufacturing, chemical manufacturing, coal mining and selection, oil and natural gas mining and selection, metal mining and selection, and non-metallic mining and selection
Design challenge three
Touch buttons, touch sliders and touch pads all use copper foil as touch sensors, but touch screens basically use ITO (Indium Tin Oxides)
material as the touch sensing layer. The resistivity of copper foil is extremely small, so its resistance is almost negligible. ITO is transparent and conductive
, but ITO has a relatively high resistivity. Usually the resistivity of ITO is expressed as square resistance on touch screens, that is, the resistance of a unit square.
Generally, the sheet resistance of ITO ranges from 45 to 350 ohms, depending on the coating process of the touch screen manufacturer. Due to the existence of ITO
resistors, there will be a resistance of 3K~30K ohms at the near end and far end of each sensing strip on the touch screen. This resistance combined with the RC
delay generated by the self-capacitance on each sensing strip makes the induction The near and far ends of the bar will have different response times or charge
and discharge times for the emitted signals, which will lead to different sizes of finger touch signals at the near and far ends. In severe cases, this difference can
reach more than 50%. How to eliminate or reduce this difference is the third challenge in multi-point capacitive touch screen design. Although choosing an ITO
coating with lower sheet resistance is the most direct way to reduce this difference, usually the
thickness of ITO coating with lower sheet resistance will be thicker, resulting in a decrease in transparency and an increase in cost. This is unacceptable to many end customers.
Design challenge four
Signal-to-noise ratio (SNR) is one of the most important indicators in multi-point capacitive touch screen design. For a touch screen, it is not
enough to have a large enough finger signal. In fact, the touch screen is not in an
ivory tower, and there are many noise sources around it. For example, the LCD immediately below it is a noise source. Different LCDs and even
different display screens have different noise sizes and spectra. Especially for some AC Vcomm type LCDs, it can produce current noise up to
15nA/mm2 and voltage noise above 1V on the surface of the LCD. Although the solution of placing an ITO shielding layer under the touch screen
has been adopted by some designers, the increase in the shielding layer leads to an increase in the thickness and cost of the touch screen, which
also affects visibility to a certain extent. Not all end customers may accept this. The radio frequency signal of the mobile phone itself and the
electromagnetic waves from the outside will also interfere with it. When a terminal with a touch screen is powered by external mains power,
a large amount of common mode noise may be generated from the power grid and power adapter. There are also troublesome charger noise,
noise generated by the touch screen and the system itself, such as AD conversion noise, switching noise, power supply noise and 8 kV ESD noise
used in ESD testing. In such a noisy environment, how to make the touch screen system have good noise immunity to noise from various noise
sources and obtain a high enough signal-to-noise ratio is the fourth challenge in multi-point capacitive touch screen design.
Contact: Mr. Lai
Wechat:17750010683
Whats app：+86 17750010683
Skype：+86 17750010683
QQ: 3221366881
3221366881@qq.com
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1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
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Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
