Description
IC698CHS009A General Electric of the United States
IC698CHS009A General Electric of the United States
Module Clips Drive controller servo moto
IC698CHS009A General Electric of the United StatesSuitable 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
2.2 Defects of capacitive touch screens
The light transmittance and clarity of the capacitive touch screen are better than the four-wire resistive screen
, but of course it cannot be compared with the surface acoustic wave screen and the five-wire resistive screen.
The capacitive screen is seriously reflective, and the four-layer composite touch screen with capacitive technology
has uneven transmittance of light of various wavelengths,
causing color distortion. Due to the reflection of light between the layers, the image characters are also blurred
. In principle, capacitive screens treat the human body as a capacitorOne electrode of the component is used. When
a conductor is close to the interlayer ITO working surface and a capacitor of sufficient capacitance is coupled, the
current flowing away is enough to cause the capacitive screen to malfunction. We know that although the capacitance
value is inversely proportional to the distance between the poles, it is directly proportional to the relative area, and is also
related to the insulation coefficient of the medium. Therefore, when a larger area of the palm or a conductive object is held close
to the capacitive screen instead of touching it, it can cause the capacitive screen
to malfunction. In humid weather, this situation is particularly serious. Putting your body within 15 cm of the monitor can cause the
capacitive screen to malfunction. Another disadvantage of capacitive screens is that they do not respond when touched
with a gloved hand or a non-conductive object, due to the addition of a more insulating medium. The main disadvantage
of the capacitive screen is
drift: when the ambient temperature and humidity change, and the environmental electric field changes, it will cause the
capacitive screen to drift, causing inaccuracy. For example: the temperature rise of the monitor after turning on the screen
will cause drift: when the user touches the screen while the other hand or side of the body is close to the monitor, it will drift;
larger objects near the capacitive touch screen will drift after being moved, and if someone comes around to watch when you
touch the screen, it will drift. It will cause drift; the reason for the drift of the capacitive screen is an inherent technical shortcoming.
Although the environmental potential surface (including the user”s body) is far away from the capacitive touch screen, it is much
larger than the finger area. They directly affect the determination of the touch position. . In addition, many relationships that should
be linear in theory are actually non-linear. For example, people with different weights or fingers with different degrees of wetness
draw different total currents, and the changes in the total current and the changes in the four partial currents It is a non-linear relationship.
The four-corner custom polar coordinate system used by the capacitive touch screen does not have an origin on the coordinates. The
controller cannot detect and recover after drifting. Moreover, after the four A/Ds are completed, the four points are The calculation process
from the flow value to the X and Y coordinate values of the touch point on the rectangular coordinate system is complicated. Since there is no
origin, the drift of the capacitive screen is cumulative
and calibration is often required at the job site. The outermost silica protective glass of the capacitive touch screen is very scratch-resistant,
but it is afraid of being hit by nails or hard objects. Knocking out a small hole will damage the interlayer ITO, whether it is damage to
the interlayer ITO or damage during installation and transportation. With the ITO layer on the inner surface, the capacitive screen cannot work properly.
3. Infrared touch screen
Contact: Mr. Lai
Wechat:17750010683
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Skype：+86 17750010683
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3221366881@qq.com
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