Description
AO02 Protective devices
AO02 Protective devices
Module Clips Drive controller servo moto
AO02 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
S3c2410 touch screen and analog-to-digital conversion
1. Several concepts of touch screen
The so-called touch screen, from a market concept, is a computer input device that everyone can use, or a device that everyone can use to communicate
with computers. No need to learn, everyone can use it, which is the greatest magic of touch screen. Neither keyboard nor mouse can compare with it.
From the perspective of technical principles, the touch screen is a transparent absolute addressing system. First of all, it must be transparent, so it must solve
the transparency problem through material technology, such as digitizers, writing pads, and elevator switches. They are not touch screens. ; Secondly, it is an
absolute coordinate, which is where the finger touches. It does not require a second action. Unlike the mouse, it is a system of relative positioning. We can notice
that touch screen software does not require a cursor. The presence of a cursor affects the user”s Attention, because the cursor is for relatively positioned devices.
To move a relatively positioned device to a place, it must first know where it is now and which direction it is going. It also needs to constantly provide feedback to the
user at all times. The position will not be biased. These are not required for touch screens that adopt absolute coordinate positioning; secondly, they are able to
detect finger touch movements and determine finger position. Various touch screen technologies revolve around “detecting finger touch” and the eight immortals
show their magical powers across the sea.
1. The first pointer of the touch screen: optical characteristics. It directly affects the visual effect of the touch screen. But the touch screen is a multi-layer composite film,
and its optical properties include four aspects: transparency, color distortion, reflectivity and clarity. The color world includes various wavelength colors in the visible light
band. Before the transparent material technology is completely solved, or before there is a low-cost solution to the transparent material technology, the light transmission
of the multi-layer composite film touch screen at various wavelengths Sexuality cannot yet reach the ideal state of consistency. Here is a schematic diagram (Figure 6-1):
Figure 6-1
Due to the existence of the light transmittance and wavelength curve, the image seen through the touch screen inevitably produces color distortion from the original image.
The static image only feels like color distortion, and the dynamic multimedia image does not feel very comfortable. The color Distortion, which is the maximum color distortion
in the picture, is naturally as small as possible. The transparency usually referred to can only be the average transparency in the picture. Of course, the higher the better.
Reflectivity mainly refers to the overlapping light and shadow on the image caused by specular reflection, such as silhouettes, windows, lights, etc. Reflection is a negative effect
caused by touch screens. The smaller the better, it affects the user”s browsing speed. In severe cases, image characters cannot even be recognized. The use environment of highly
reflective touch screens is restricted, and the lighting layout of the scene is also forced to be adjusted. Most touch screens with reflective problems provide another surface-treated model:
matte touch screen, also called anti-glare type. The price is slightly higher. The anti-glare type has significantly reduced reflectivity and is suitable for halls or exhibitions with very sufficient
lighting. However, the light transmittance and clarity of the anti-glare type also decrease significantly.
Clarity. After some touch screens are installed, the handwriting and image details are blurred. The entire screen appears blurry and cannot be seen clearly. This means that the clarity is
too poor. The problem of clarity is mainly caused by touch screens with multi-layer film structures, which are caused by repeated reflection and refraction of light between film layers. In
addition, anti-glare touch screens can also cause a decrease in clarity due to the frosted surface. Poor clarity can cause eye fatigue easily and cause some damage to the eyes. Pay
attention to judgment when purchasing a touch screen.
2. The second characteristic of the touch screen: stability. The touch screen is an absolute coordinate system. If you want to select something, just click there. The essential difference from
relative positioning systems such as the mouse is the intuitiveness of getting it right at once. The characteristic of the absolute coordinate system is that each positioning coordinate has no
relationship with the previous positioning coordinate. The touch screen is physically an independent coordinate positioning system. The data of each touch is converted into coordinates on the
screen through calibration data. In this way, it is required No matter what the situation is, the output data of the same point on the touch screen is stable. If it is unstable, then the touch screen
cannot guarantee absolute coordinate positioning and the points will be inaccurate. This is the most feared problem of touch screens: drift. Technically speaking, any touch screen that cannot
guarantee the same sampling data every time the same point is touched is inevitably subject to the problem of drift. Currently, only capacitive touch screens have drift.
3. The third characteristic of touch screen: responsiveness. To detect touch and position, various touch screen technologies rely on their own sensors to work, and some touch screens themselves
are even a set of sensors. Their respective positioning principles and sensors determine the response speed, reliability, stability and lifespan of the touch screen. The sensor mode of the touch
screen also determines how the touch screen recognizes multi-touch issues, that is, what to do if more than one point is touched at the same time? What should I do if someone touches me and
then someone else touches me next to me? This is a problem that often occurs when using touch screens. I think the most ideal way is: no one will judge if more than one point is touched at the
same time. Wait until the multi-touch is removed. If someone touches and then someone touches, it should be judged in sequence. Of course if it”s technically possible.
Contact: Mr. Lai
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