20-09-2014, 11:45 AM
liquid crystal display
[attachment=68226]
ABSTRACT
A liquid crystal display (LCD) is an electro
optical amplitude modulator realized as a
thin, flat display device made up of any
number of color or monochrome pixels
arrayed in front of a light source or reflector.
6There are 2 types of LCD that is PASSIVE
MATRIX and ACTIVE MATRIX
LCD.LC’s can be aligned by electric and
magnetic fields .one electro optical affects
with LCs requires a current through the LCs
cell; all other practiced electro optical
affects only require an electric field(without
current) for the alignment of LC.
LCD television now uses liquid crystals
captivated between two polarized glass
sheets and a matrix of TFT (thin film
transistor) transistors that control the electric
flow through the crystals .The glass sheet
contains thousands of tiny cells or pixels and
each one is colored with green blue or red.
The performance of LCD can be improved
what is llcd(RGB) light emitting diodes
instead of cold cathode fluorescent lamps in
edge lit LCD backlights brightness and color
performance (gamut) of LCD displays.
In present daily life some other
technologies have entered this feild which
have better features than LCD technology
like DLP (Digital liquid processing) and
CRT (cathode ray tube).Presently it is being
challenged by PLASMA television. The
main difference between LCD and DLP is
being presented in the project .Texas
Instruments experiment clearly describes the
difference between LCD and DLP
technology
INTODUCTION
In the following project a detail explanation
about what is LCD and what are the features
of LCD are being depicted.LCD is a display
device that uses thin, flat sheet made up of
liquid crystals and this thin sheet is placed in
front of a light source. The molecules of
liquid crystal are twisted in their natural
state and allow the light to pass through.
However, when certain amount electricity
passes through liquid crystals, the molecules
get stretched and block the light and the
darkening of the pixels depends on the
electric current. Pixels are completely
darkened when there is no electricity.
As for colour LCD display, it will have three
sub-pixels (green, blue and red) and
depending on the pixels that get light, the
LCD will produce the final image on the
screen.
LCD
A liquid crystal display (LCD) is an electro
optical amplitude modulator realized as a
thin, flat display device made up of any
number of color or monochrome pixels
arrayed in front of a light source or reflector.
It is often utilized in battery-powered
electronic devices because it uses very small
amounts of electric power.
ADVANTAGES OF LCD
OVER PLASMA
Apart from being price competitive, LCD
has the edge over plasma in several other
key areas. LCDs tend to have higher native
resolution than plasmas of similar size,
which means more pixels on a screen.
There are no sources in the current
document.LCDs also tend to consume less
power than plasma screens, with some
estimates ranging that power saving at up to
30 per cent less than plasma. LCDs are also
generally lighter than similar sized plasmas,
making it easier to move around or wall
mount.
LCD pundits also point to the fact that LCDs
have a longer lifespan than plasma screens.
This was true of earlier plasma models,
which would lose half of their brightness
after more than 20,000 hours of viewing.
Later plasma generations have bumped that
up to anything between 30,000 and 60,000
hours. LCDs, on the other hand, are
guaranteed for 60,000 hours.
Description of the Lab Test
The test was conducted at the facilities of the
Munsell Color Science Laboratory in
Rochester, NY. It was carried out in a
dedicated 10 x 18 foot room. Eight projectors
were operated essentially 24 hours per day, 7
days per week. These included the two DLP
projectors and five LCD projectors already
noted, plus an LCOS-based projector. The
technical performance data pertaining to the
LCOS machine was not included in the final
report issued by TI since a sample of one is
not sufficient to support any conclusions
about the technology.
CONCLUSION
From the above detailed explanation about
LCD technology I have concluded that LCD
is a growing technology . LCD technology
will be used in many fields like High
Performance LCD Blacklighting using high
intensity Red,Green and Blue light emitting
Diodes.
In future LCD technology will be
overcomed by latest DLP technology which
is invented by TEXAS INSTRUMENT. As
DLP have small package size. DLP consists
of one single chip than 3 in LCD
Panels.DLP panels are more compact than
LCD.
DLP can produce higher contrast video with
deeper blacklevels than we get in LCD
projectors.
Conclusion
Manufacturers recognize that the organic
compounds in LCD panels and polarizers are
susceptible to high heat and light energy
stress, and will eventually break down if
deployed in high stress environments—in
particular 24x7 operation with higher than
normal ambient temperatures. Compact
portable LCD projectors are in general not
recommended for 24x7 duty cycles because
of this.
[attachment=68226]
ABSTRACT
A liquid crystal display (LCD) is an electro
optical amplitude modulator realized as a
thin, flat display device made up of any
number of color or monochrome pixels
arrayed in front of a light source or reflector.
6There are 2 types of LCD that is PASSIVE
MATRIX and ACTIVE MATRIX
LCD.LC’s can be aligned by electric and
magnetic fields .one electro optical affects
with LCs requires a current through the LCs
cell; all other practiced electro optical
affects only require an electric field(without
current) for the alignment of LC.
LCD television now uses liquid crystals
captivated between two polarized glass
sheets and a matrix of TFT (thin film
transistor) transistors that control the electric
flow through the crystals .The glass sheet
contains thousands of tiny cells or pixels and
each one is colored with green blue or red.
The performance of LCD can be improved
what is llcd(RGB) light emitting diodes
instead of cold cathode fluorescent lamps in
edge lit LCD backlights brightness and color
performance (gamut) of LCD displays.
In present daily life some other
technologies have entered this feild which
have better features than LCD technology
like DLP (Digital liquid processing) and
CRT (cathode ray tube).Presently it is being
challenged by PLASMA television. The
main difference between LCD and DLP is
being presented in the project .Texas
Instruments experiment clearly describes the
difference between LCD and DLP
technology
INTODUCTION
In the following project a detail explanation
about what is LCD and what are the features
of LCD are being depicted.LCD is a display
device that uses thin, flat sheet made up of
liquid crystals and this thin sheet is placed in
front of a light source. The molecules of
liquid crystal are twisted in their natural
state and allow the light to pass through.
However, when certain amount electricity
passes through liquid crystals, the molecules
get stretched and block the light and the
darkening of the pixels depends on the
electric current. Pixels are completely
darkened when there is no electricity.
As for colour LCD display, it will have three
sub-pixels (green, blue and red) and
depending on the pixels that get light, the
LCD will produce the final image on the
screen.
LCD
A liquid crystal display (LCD) is an electro
optical amplitude modulator realized as a
thin, flat display device made up of any
number of color or monochrome pixels
arrayed in front of a light source or reflector.
It is often utilized in battery-powered
electronic devices because it uses very small
amounts of electric power.
ADVANTAGES OF LCD
OVER PLASMA
Apart from being price competitive, LCD
has the edge over plasma in several other
key areas. LCDs tend to have higher native
resolution than plasmas of similar size,
which means more pixels on a screen.
There are no sources in the current
document.LCDs also tend to consume less
power than plasma screens, with some
estimates ranging that power saving at up to
30 per cent less than plasma. LCDs are also
generally lighter than similar sized plasmas,
making it easier to move around or wall
mount.
LCD pundits also point to the fact that LCDs
have a longer lifespan than plasma screens.
This was true of earlier plasma models,
which would lose half of their brightness
after more than 20,000 hours of viewing.
Later plasma generations have bumped that
up to anything between 30,000 and 60,000
hours. LCDs, on the other hand, are
guaranteed for 60,000 hours.
Description of the Lab Test
The test was conducted at the facilities of the
Munsell Color Science Laboratory in
Rochester, NY. It was carried out in a
dedicated 10 x 18 foot room. Eight projectors
were operated essentially 24 hours per day, 7
days per week. These included the two DLP
projectors and five LCD projectors already
noted, plus an LCOS-based projector. The
technical performance data pertaining to the
LCOS machine was not included in the final
report issued by TI since a sample of one is
not sufficient to support any conclusions
about the technology.
CONCLUSION
From the above detailed explanation about
LCD technology I have concluded that LCD
is a growing technology . LCD technology
will be used in many fields like High
Performance LCD Blacklighting using high
intensity Red,Green and Blue light emitting
Diodes.
In future LCD technology will be
overcomed by latest DLP technology which
is invented by TEXAS INSTRUMENT. As
DLP have small package size. DLP consists
of one single chip than 3 in LCD
Panels.DLP panels are more compact than
LCD.
DLP can produce higher contrast video with
deeper blacklevels than we get in LCD
projectors.
Conclusion
Manufacturers recognize that the organic
compounds in LCD panels and polarizers are
susceptible to high heat and light energy
stress, and will eventually break down if
deployed in high stress environments—in
particular 24x7 operation with higher than
normal ambient temperatures. Compact
portable LCD projectors are in general not
recommended for 24x7 duty cycles because
of this.