Description
DSSA165 Power Supply Module
DSSA165 Power Supply Module
Module Clips Drive controller servo moto
DSSA165 Power Supply ModuleSuitable 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
What types of resistive touch screens are there and what is their structure?
The touch screens we commonly use today can be divided into four categories: resistive touch screens, surface capacitive touch screens
, infrared touch screens, and surface acoustic wave touch screens.
1. Resistive touch screen: The structure of the resistive touch screen is to form a transparent conductive film on a glass substrate, set a
spacer on it, and then set a transparent conductive film. An electric field is applied in the vertical direction on the upper conductive film and the
lower glass substrate respectively. When a finger or other object touches any position of the upper conductive film, that part will be energized with
the conductive film on the lower glass substrate, and the touched position is calculated by measuring the voltage drop at this time.
2. Capacitive touch screen: The capacitive touch screen is plated with long and narrow electrodes on all four sides of the touch screen. The voltage is
connected to the four corners, forming a low-voltage AC electric field in the conductive body. When a finger touches the screen surface, a coupling capacitance
is formed between the finger and the conductor. The current emitted by the electrodes on the four sides flows to the touch point. Because the working surface is
connected to a high-frequency signal, the finger will absorb a very small current. This current flows out from the electrodes on the four corners of the touch screen
respectively. The strength of the current depends on the distance between the finger and the electrode. Proportional to the distance, the location of the touch point can be calculated.
3. Infrared touch screen: Infrared touch screen has infrared transmitting tubes and receiving tubes arranged on the four sides of the screen frame, which correspond to
each other to form a horizontal and vertical infrared matrix. When we touch a certain point on the screen with our fingers, it will block the infrared light passing through that
position. There are two horizontal and vertical infrared rays, and the central processor uses this to calculate the position of the touch point. It is mainly composed of infrared
transmitting and receiving sensing elements installed on the outer frame of the touch screen.
4. Surface acoustic wave touch screen: Surface acoustic wave touch screen is a sound wave generator, reflector and sound wave receiver installed on the surface of the
display. The sound wave generator sends a high-frequency sound wave across the screen surface. When the finger touches the screen, the contact point The sound waves
are blocked and the central processor determines the location of the touch point.
Introduction and summary of resistive touch screen types
1. Working principle of resistive touch screen:
A resistive touch screen is a sensor that converts the physical position of a touch point (X,Y) in a rectangular area into a voltage representing the X coordinate and Y coordinate
. Many LCD modules use resistive touch screens, which can use four, five, seven or eight wires to generate screen bias voltage and read back the voltage of the touch point. The
resistive touch screen is basically a film plus glass structure. The adjacent sides of the film and glass are coated with
ITO (Nano Indium Tin Metal Oxide) coating, ITO has good conductivity and transparency. When a touch operation is performed, the ITO on the lower layer of the film will contact the ITO
on the upper layer of the glass, and the corresponding electrical signal is transmitted through the sensor, sent to the processor through the conversion circuit, and converted into X and
Y values on the screen through calculation, and the point is completed. The selected action is displayed on the screen.
2. Types of resistive touch screens:
Basic structure and driving principle of resistive touch screen.pdf
Road navigation 3. The basic structure of various types of resistive touch screens: 1. Four-wire resistive touch screen
The structure of the four-wire resistive touch screen is as shown above. The glass or acrylic substrate is covered with two layers of turbine, uniformly conductive ITO layers, which are
used as X electrodes and Y electrodes respectively. They are separated and insulated by evenly arranged transparent grids. . The lower ITO
Four-wire touch screen Five-wire touch screen Six-wire touch screen Seven-wire touch screen Eight-wire touch screen
It is attached to the glass substrate, and the upper ITO is attached to the PET film. The positive and negative ends of the X electrode and Y electrode are led from both ends by “conductive
strips” (black strips in the figure), and the positions of the X electrode and Y electrode conductive strips are perpendicular to each other. There are four wires in total at the lead-out terminals:
X-, X+, Y-, and Y+. This is where the name of the four-wire resistive touch screen comes from. When an object touches the touch screen surface and exerts a certain amount of pressure, the upper IT
The O conductive layer deforms and comes into contact with the underlying ITO. This structure can be equivalent to the corresponding circuit, as shown below
2. Eight-wire resistive touch screen
How about Samsung i8262d? The structure of the eight-wire resistive touch screen is similar to that of the four-wire one. The difference is that in addition to the four electrodes of X-drive,
X- sense, X+ sense, Y- sense, Y+ sense, so there are eight lines in total. x27
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