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AN658 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - LCD Fundamentals and the LCD Driver Module - Microchip

भाग संख्या AN658
समारोह LCD Fundamentals and the LCD Driver Module
मैन्युफैक्चरर्स Microchip 
लोगो Microchip लोगो 
पूर्व दर्शन
1 Page
		
<?=AN658?> डेटा पत्रक पीडीएफ

AN658 pdf
AN658
Polarization is the process or state in which rays of light
exhibit different properties in different directions,
especially the state in which all the vibration takes
place in one plane. Essentially, a polarizer passes light
only in one plane. As shown in Figure 3, if light is
polarized in one plane, by passing through a polarizer,
it cannot pass through a second polarizer if its plane is
90° out of phase to the first.
The front polarizer is applied to the outside surface of
the top piece of glass. The top piece of glass also
provides structural support for the LCD panel.
FIGURE 3:
OUT OF PHASE AND
IN-PHASE POLARIZERS
LC molecules are long and cylindrical. On any plane
within the LC fluid, the molecules align themselves
such that the major axis of each molecule is parallel to
all others, as shown in Figure 4. The outermost planes
of the LC molecules will align themselves on the same
axis that the polyimide is “rubbed”. The direction of
“rubbing” of the polyimide on the bottom glass is 90°
apart from that of the polyimide on the top glass. This
orientation creates the twist in the LC fluid.
FIGURE 4:
LC MOLECULES IN
ALIGNMENT
On the bottom of the top glass, a transparent coating of
Indium Tin Oxide (ITO) is applied to the glass. ITO is
conductive and forms the backplane or the common
electrodes of the LCD panel. The patterns of the
backplane and segment ITO form the numbers, letters,
symbols, icons, etc.
After the ITO has been applied to the glass, a thin
polyimide coating is applied to the ITO. The polyimide
is “rubbed” in a single direction that matches the
polarization plane of the front polarizer. The action of
“rubbing” the polyimide causes the Liquid Crystal (LC)
molecules in the outermost plane to align themselves in
the same direction.
The next layer is a reservoir of LC. The LC fluid has
many planes of molecules.
The next layer is the polyimide coating on the bottom
glass followed by the ITO segment electrodes. The
bottom glass also supplies structural integrity for the
LCD panel as well as mounting surface for the
electrode connections. Applied to the external surface
of the bottom glass is the rear polarizer. Depending on
the type of viewing mode employed by the LCD panel,
the axis of polarization is the same or 90° apart from
the front polarizer.
A consequence of this alignment is that each
intermediate plane of LC molecules will have a slightly
different orientation from the plane above or below as
seen in Figure 5.
The twisting of the planes causes the polarization of the
light to twist as it passes through the LC fluid. The
twisting of the LC planes is critical to the operation of
the LCD panel as will be shown in the next section.
FIGURE 5:
LC MOLECULES PLANE
ORIENTATION
DS00000658B-page 2
1997-2014 Microchip Technology Inc.

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