All language subtitles for Laptop Displays - CompTIA A+ 220-1101 - srt

Many of the laptops we use today
have an LCD display.

This is a liquid crystal display
where there are

a series of liquid crystals
associated with color filters,

and there is a backlight or a light source
behind all of that

that shines through to give us the image
that's on our screen.

From a laptop perspective,
the advantages of an LCD display

is that they are lightweight and use
very little power, and they're relatively

inexpensive to make,
keeping the cost of the laptop down.

There are some disadvantages
with LCD displays.

One is that this light source in the back
has to shine

through to provide the color,
which means getting a true

black can be quite difficult on an LCD
display.

We might also have different kinds
of backlights on our displays.

The light source may be fluorescent,

it may be LED,
or may be some other type of light.

If this backlight was to fail,
you could see that

it's part of the display itself,
making it relatively difficult

to be able to repair or replace.

There are three different technologies
of liquid crystal displays

that you need to be aware of.

One is the T in LCD.

This is the twisted pneumatic LCD,
which gives us very good response times.

If you're a gamer or you're using some
application that has fast moving graphics.

This may be the display type for you.

Unfortunately, these displays often
have very bad viewing angles,

which means once you get off
to the side of the display,

you'll notice
there's an inversion of the color.

If you want the best possible
view of an LCD,

you need to be looking directly
at the display.

If you're looking for the best possible
color representation

on an LCD display,
you'll want to use an IPS LCD.

The IPS stands for In-Plane switching.

This gives you very good color
representation, which is great

if you're using graphics
or doing some type of desktop publishing,

but these are slightly more expensive
than a TN.

So that extra color representation
comes at a bit of a cost.

If you like something
that's in the middle between ten and IPS,

you may want a vertical alignment LCD
or a VR display.

This has good color representation,
but you'll find the response

times are a bit slower
than a twisted thematic LCD.

If you have a

newer
device, you may be using an OLED display.

The OLEDs stands for organic Light
emitting diode

and it doesn't have a backlight.

Instead, this organic material emits light
when you provide it with a current

because there's no backlight.

No liquid crystals.

These are very thin displays,

and there's no glass that you would need
on the front of the display to protect it.

The real key is that organic material
that's able to create its own light

when you provide it with power,

and that's what allows these displays
to be very light and very thin.

You'll find them on tablets,
phones, and smart devices,

not only because they provide
such great color representation,

but because they're so
light and so easy to carry.

One aspect of our laptop displays

that we don't often think about
is how they're used on wireless networks.

When you open the laptop,
your display is the highest component

in that system, so it's a perfect place
to run your wireless antennas.

If you're using 1211 Bluetooth
or some other type of wireless networking.

Then you probably have an antenna that
runs to the top of your laptop display.

This creates some challenges
when you are replacing the display,

because you do not only have to remember

to connect to all of your video
components.

You have to remember to connect
all of these antenna wires as well.

Here's a picture of a display.

This one does look a bit damaged.

You can see the primary connection
that we use for the video signal,

but coming out of the other
side of the display is a white

and a black wire that's used for 802 11.

You need to take care
when replacing this display,

that you're following the same path
that the previous wires took,

so that you could connect
all of those wireless antennas

to the appropriate components
on the system board.

This is what it looks like
when everything is in place.

You can see some antenna wires
coming out of the system board.

They're wrapping around the system,
and these appear to wrap

all the way
into the top of this particular laptop.

If we look closely, we can see wires
that are used for the 812 seven network.

There are some additional wires
also at the top of this display.

These are the wires that are used to

bring the signal from the audio
and video associated with the webcam.

Many laptops these days have

webcams integrated into the laptop itself.

That's a small little hole at the top

for the camera and a tiny little dot
right next to it for the microphone.

This can obviously be used
for video capture,

but it's also used for meetings
and video conference calls.

This makes it easy
when you need to be on a zoom call.

You can simply open your laptop display,
and the camera built into

the display
will be able to show you on the call.

Here's a better shot from this laptop,
which clearly shows that

this is the webcam
that's integrated into the laptop display,

and you can see there are holes also
for the microphone in the display as well.

We mentioned earlier that a liquid crystal
display needs some type of light

behind the system

to shine through, so that we're able
to see the images on the screen.

If you're working with an older laptop,
this might be a fluorescent

type of light, specifically a kffl or cold
cathode fluorescent lamp.

These require a bit more power than
the LED lights that we tend to use today,

and you'll find the LED
backlights are also a bit thinner,

taking up a lot less space
on your laptop computer.

If you're working with an older laptop
or you need to replace the display

on an older laptop,
you may find that the backlight that it's

using is a scuffle backlight.

Newer LCD displays might use

LED lights
instead of using a fluorescent lamp.

These LED lights may be around
the edge of the display,

or they might be in a matrix
such as the one that's seen here.

These have become so common
that instead of people referring to this

as an LCD,
they often refer to it as an LCD display.

What they really need,
of course, is and LED backlit LCD.

If you were to pull the front off
of a display that has LED backlights,

you might see the matrix behind it
looking like this.

These are strips of LED lights,
and you can see each one of these

LED lights is in a very large matrix
behind the display.

The display is smart enough

to recognize what parts of the display
should be lighter or darker,

and will adjust the lighting depending
on what you're viewing on the screen.

If you're

working on one of these older laptops
with Kffl or these fluorescent backlights,

you may also find some
additional components behind the screen.

These are inverters.

We use these inverters
because the kffl backlight

requires AC power,
but your laptop is using DC power.

The inverters are responsible
for taking that DC power,

converting it to AC so that we can power
those fluorescent backlights.

One way to tell

if your backlight has failed is to shine
a flashlight directly at the screen.

If you're able to make out
some of the information on the screen,

then it's very possible
that the problem is not with the display,

but with the backlight behind the display.

If this is a kffl backlight,
you may just need

to replace the inverters and you'd be able
to restore the backlight.

On some systems, you may have to replace
the entire display.

You'll have to check
with the documentation for your laptop

to see what applies
for your particular model.

If you're using a hybrid device
like this one

that has a keyboard
and a tablet type display, you may

be able to use a very high resolution
input with this stylus.

That stylus allows you
to directly draw on the screen,

and whatever you're pushing on the screen
is converted into digital signals.

In the display.

We're able to provide that conversion,
because inside of this display

is a digitizer that converts that analog
input onto the display

into digital signals
that the computer can use.

The digitizer in your device
may only allow for stylus input,

or it might also provide
input using a touch screen.

A touch screen digitizer
takes input from our finger, converts

it into a digital form
to be used by that system.

It's a very common way to get information
into a laptop or a tablet,

and we can often use a keyboard,
a stylus, or key presses

all on the same system
to perform this input function.