Usually, touch controller is a
small micro controller chip, which is located in touch sensor and PC/or
embedded system between controller. The chip can assembly to internal system
controller board, also can put paste into glass touch sensor on the flexible
printed circuits (FPC).
Touch controller will extract from touch sensor information, and converts it
into PC or embedded system controller can
Touch screen is a make multimedia
information or control the new-look equipment, it gives the multimedia system
with a brand new look, is extremely attractive new multimedia interactive
equipment. The developed
countries system designers and our country takes the lead to use the touch
screen system designers have clearly know, touch screen for various application
fields of computer is no longer is dispensable things, but indispensable
equipment. It greatly simplifies the use of computers, even the computer
know nothing, and so can exist, make computer more enchantful. To solve the
public information market computer is unable to solve the problem. Along with
the city to develop in the direction of information and computer network in the
national life penetration, information query are already using touch screen
realize - display content can touch forms. In order to help you to touch screen have a general
understanding, the author here provide some relevant touch screen related
knowledge, hope these content to everyone to use.
Touch the analysis technology
Beat out design in the product design is touch the most important first
step. Touch screen on the supply chain many providers usually provides many
confusing different components, and more time is some providers unite for
terminal customers with a value chain. Figure 1 gives the touch screen to the
ecosystem's structure diagram. Interestingly, whether in
the latest notebook computer, or the latest touch screen mobile phone, the
ecological system is the same.
Figure 1: touch screen controller
analytic
1, the front panel or frame
The front panel or frame are the
end products of the most surface. In some of the products, this frame will be
transparent cover inclose, lest by external of severe weather, or wet
influence, but also prevent the sensing products are score and failure.
Sometimes, the outside box simply covering the top of the touch sensors, this
kind of circumstance is only a decoration.
2, touch controller
Usually, touch controller is a
small micro controller chip, which is located in touch sensor and PC/or
embedded system between controller. The chip can assembly to internal system
controller board, also can put paste into glass touch sensor on the flexible
printed circuits (FPC). Touch controller will extract from touch sensor
information, and converts it into PC or embedded system controller can
understand information.
3, touch sensor
Touch screen "sensor"
is a touch response surface with transparent glass plate. The sensor is put to
the LCD above, make the touch panel display area can cover the viewing area.
Now there are many kinds of different touch sensor technology, each using each
other different methods to detect touch control input. Basically, these
technologies are in touch, the current through the panel, so as to produce a
voltage or signal changes. The voltage variation will be touch controller
sensing, so as to determine the screen touch control position.
4, liquid crystal display (LCD)
The vast majority of touch screen
system used in the traditional on LCD. Used to touch LCD products selection
method and the traditional system is basic and same, including resolution, the
articulation, the moving speed, cost, etc. But in touch screen another of the
main consideration is radiation level. Due to touch the sensor technology based
on touch panel is produced by the tiny electric change, can radiation many
electrical noise LCD is the difficulty in the design. In the choice for the LCD
touch system before, should and touch sensor provider negotiations.
5, system software
Touch screen driver software can
come from the original manufacturers (such as mobile phone embedded OS), also
can be then add software (as in the traditional PC add a touch screen). The
software should be able to make touch screen and working system controller. It
will tell product operating system how to analysis from the touch controller
touch event information. In the PC type application, the vast majority of touch
screen drive work like a mouse. This makes touch screen and in the same
position on the screen of a continuous according to the mouse is very similar.
In embedded systems, the embedded control driver must will appear on the screen
information and receiving to the touch location comparison.
Three big touch technology
Resistive touch technology:
resistance type touch technology is the most commonly used touch screen
technology. Used for high business flow applications, and the water drops on
the screen and other residue is immune. Resistive touch screen is usually the
lowest cost solutions. Due to pressure is a reaction that can use fingers,
gloved hand, touch pen, or as credit card this kind of other objects to touch.
Surface capacitance type touch
technology: surface capacitance type touch technology provides the display
resolution ratio resistance type touch commonly used in plastic film to much
more clear. On the surface capacitance type display, is located in the display
four corner of the sensor detection because touch cause capacitance change.
This kind of touch screen can use finger or other capacitive object to realize
touch incentive.
Protective capacitance type
touch: protective capacitance type touch is only recently come into the market
of a kind of technology. This technology can also provide excellent pervious to
light quality, but it also has some specific surface capacitance type touch
much better advantages. Projection type capacitance type touch don't need
position calibration, and can provide much higher position accuracy. Projection
type capacitance type touch another exciting place, that is, it also can
support more touch.
Touch screen working principle
In order to operate convenience,
people use touch screen to replace the mouse or keyboard. Work, we must first
with your fingers or other objects touch installed in front of the display
screen, and then system according to the fingers of the icon or menu position
to locate choose
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